/* roulang page: index */
:root {
        --primary: #0E7A5F;
        --primary-dark: #0A5F4A;
        --primary-light: #E6F2EE;
        --primary-soft: #F0F7F4;
        --accent: #F5A623;
        --accent-dark: #D88B0A;
        --accent-light: #FFF4DE;
        --bg: #FAF7F2;
        --card-bg: #FFFFFF;
        --text: #1F2A28;
        --text-muted: #66736F;
        --text-light: #8A9692;
        --border: #E4E0D9;
        --border-light: #EDE9E2;
        --danger: #D9534F;
        --footer-bg: #15322B;
        --footer-text: #B8C9C2;
        --footer-heading: #EDF3F0;
        --radius-card: 16px;
        --radius-btn: 10px;
        --radius-tag: 20px;
        --radius-input: 10px;
        --shadow-card: 0 2px 8px rgba(31,42,40,.05);
        --shadow-card-hover: 0 8px 24px rgba(14,122,95,.12);
        --shadow-nav: 0 2px 12px rgba(31,42,40,.08);
        --transition-base: all .22s ease;
        --container-max: 1200px;
        --section-pad-desktop: 72px;
        --section-pad-mobile: 36px;
        --font-heading: "PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,sans-serif;
        --font-body: "PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,sans-serif;
    }

    *, *::before, *::after {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
    }

    html {
        scroll-behavior: smooth;
        -webkit-text-size-adjust: 100%;
    }

    body {
        font-family: var(--font-body);
        font-size: 16px;
        line-height: 1.75;
        color: var(--text);
        background-color: var(--bg);
        min-height: 100vh;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }

    img {
        max-width: 100%;
        height: auto;
        display: block;
        border: 0;
    }

    a {
        color: var(--primary);
        text-decoration: none;
        transition: var(--transition-base);
    }

    a:hover {
        color: var(--primary-dark);
    }

    a:focus,
    button:focus,
    input:focus {
        outline: 2px solid var(--primary);
        outline-offset: 2px;
    }

    button {
        font-family: var(--font-body);
        cursor: pointer;
        border: none;
        background: none;
        transition: var(--transition-base);
    }

    ul, ol {
        list-style: none;
    }

    h1, h2, h3, h4, h5, h6 {
        font-family: var(--font-heading);
        font-weight: 700;
        line-height: 1.3;
        color: var(--text);
    }

    .container {
        max-width: var(--container-max);
        margin: 0 auto;
        padding-left: 20px;
        padding-right: 20px;
        width: 100%;
    }

    /* Header / Navigation */
    .site-header {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 1000;
        background-color: #FFFFFF;
        height: 72px;
        display: flex;
        align-items: center;
        border-bottom: 1px solid var(--border-light);
        transition: box-shadow .25s ease, background-color .25s ease;
    }

    .site-header.scrolled {
        box-shadow: var(--shadow-nav);
    }

    .header-inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 20px;
        width: 100%;
    }

    .logo {
        flex-shrink: 0;
        display: flex;
        align-items: center;
        gap: 10px;
        font-family: var(--font-heading);
        font-weight: 700;
        font-size: 20px;
        color: var(--text);
        letter-spacing: .5px;
        white-space: nowrap;
    }

    .logo:hover {
        color: var(--primary);
    }

    .logo .logo-mark {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 36px;
        height: 36px;
        background: var(--primary);
        color: #FFFFFF;
        border-radius: 10px;
        font-size: 18px;
        font-weight: 700;
        flex-shrink: 0;
    }

    .main-nav {
        display: flex;
        align-items: center;
        gap: 4px;
    }

    .main-nav a {
        display: inline-flex;
        align-items: center;
        padding: 8px 14px;
        font-size: 15px;
        font-weight: 500;
        color: var(--text);
        border-radius: 8px;
        white-space: nowrap;
        position: relative;
        transition: color .18s ease, background-color .18s ease;
    }

    .main-nav a:hover {
        color: var(--primary);
        background-color: var(--primary-soft);
    }

    .main-nav a.active {
        color: var(--primary);
        background-color: var(--primary-soft);
    }

    .main-nav a.active::after {
        content: "";
        position: absolute;
        bottom: 2px;
        left: 14px;
        right: 14px;
        height: 2px;
        background: var(--primary);
        border-radius: 2px;
    }

    .header-cta {
        flex-shrink: 0;
    }

    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        padding: 12px 22px;
        font-size: 15px;
        font-weight: 600;
        border-radius: var(--radius-btn);
        transition: var(--transition-base);
        text-align: center;
        line-height: 1.4;
        border: 1px solid transparent;
        white-space: nowrap;
    }

    .btn:hover {
        text-decoration: none;
    }

    .btn-primary {
        background-color: var(--primary);
        color: #FFFFFF;
        border-color: var(--primary);
    }

    .btn-primary:hover {
        background-color: var(--primary-dark);
        border-color: var(--primary-dark);
        color: #FFFFFF;
        transform: translateY(-1px);
        box-shadow: 0 4px 12px rgba(14,122,95,.25);
    }

    .btn-primary:active {
        transform: translateY(1px);
        box-shadow: none;
    }

    .btn-secondary {
        background-color: transparent;
        color: var(--primary);
        border-color: var(--primary);
    }

    .btn-secondary:hover {
        background-color: var(--primary-light);
        color: var(--primary-dark);
        transform: translateY(-1px);
    }

    .btn-accent {
        background-color: var(--accent);
        color: #1F2A28;
        border-color: var(--accent);
    }

    .btn-accent:hover {
        background-color: var(--accent-dark);
        color: #FFFFFF;
        transform: translateY(-1px);
        box-shadow: 0 4px 12px rgba(245,166,35,.28);
    }

    .btn-white {
        background-color: #FFFFFF;
        color: var(--primary);
        border-color: #FFFFFF;
    }

    .btn-white:hover {
        background-color: #F5F5F5;
        border-color: #F5F5F5;
        color: var(--primary-dark);
        transform: translateY(-1px);
    }

    .btn-sm {
        padding: 8px 16px;
        font-size: 14px;
    }

    .btn-lg {
        padding: 14px 28px;
        font-size: 16px;
    }

    .hamburger {
        display: none;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        width: 44px;
        height: 44px;
        border-radius: 8px;
        border: 1px solid var(--border);
        background-color: #FFFFFF;
        gap: 5px;
        padding: 0;
    }

    .hamburger span {
        display: block;
        width: 20px;
        height: 2px;
        background: var(--text);
        border-radius: 2px;
        transition: var(--transition-base);
    }

    .hamburger.open span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

    .hamburger.open span:nth-child(2) {
        opacity: 0;
    }

    .hamburger.open span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

    .mobile-drawer {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        bottom: 0;
        background: #FFFFFF;
        z-index: 999;
        padding: 20px;
        border-top: 1px solid var(--border-light);
        overflow-y: auto;
        transform: translateX(-100%);
        transition: transform .28s ease;
    }

    .mobile-drawer.open {
        transform: translateX(0);
    }

    .mobile-drawer nav {
        display: flex;
        flex-direction: column;
        gap: 6px;
    }

    .mobile-drawer nav a {
        padding: 14px 16px;
        font-size: 16px;
        font-weight: 500;
        color: var(--text);
        border-radius: 10px;
        border: 1px solid transparent;
    }

    .mobile-drawer nav a:hover,
    .mobile-drawer nav a.active {
        background-color: var(--primary-soft);
        color: var(--primary);
        border-color: var(--border-light);
    }

    .mobile-drawer .header-cta {
        margin-top: 16px;
        width: 100%;
    }

    .mobile-drawer .header-cta .btn {
        width: 100%;
    }

    /* Section base */
    .section {
        padding: var(--section-pad-desktop) 0;
    }

    .section-alt {
        background-color: #FFFFFF;
    }

    .section-tinted {
        background-color: var(--primary-soft);
    }

    .section-title {
        font-size: 30px;
        font-weight: 700;
        color: var(--text);
        margin-bottom: 12px;
        letter-spacing: .3px;
    }

    .section-subtitle {
        font-size: 17px;
        color: var(--text-muted);
        max-width: 640px;
        line-height: 1.7;
    }

    .section-header {
        margin-bottom: 36px;
    }

    .section-header.center {
        text-align: center;
    }

    .section-header.center .section-subtitle {
        margin-left: auto;
        margin-right: auto;
    }

    /* Announcement bar */
    .announcement-bar {
        background-color: var(--accent-light);
        border-bottom: 1px solid #F0E4CC;
        padding: 10px 0;
        font-size: 14px;
        color: #5F4A1F;
        text-align: center;
        margin-top: 72px;
    }

    .announcement-bar a {
        font-weight: 600;
        color: #8A5F00;
        text-decoration: underline;
        text-underline-offset: 3px;
    }

    .announcement-bar a:hover {
        color: var(--primary);
    }

    /* Hero */
    .hero {
        background: url('/assets/images/7f756da11a931c7a.webp') center/cover no-repeat;
        background-color: var(--primary-soft);
        padding: 80px 0 88px;
        position: relative;
    }

    .hero::before {
        content: "";
        position: absolute;
        inset: 0;
        background: linear-gradient(105deg, rgba(250,247,242,.97) 0%, rgba(250,247,242,.92) 45%, rgba(250,247,242,.82) 100%);
        z-index: 1;
    }

    .hero > .container {
        position: relative;
        z-index: 2;
    }

    .hero-grid {
        display: grid;
        grid-template-columns: 1.15fr .85fr;
        gap: 52px;
        align-items: center;
    }

    .hero-content h1 {
        font-size: 42px;
        font-weight: 700;
        line-height: 1.25;
        color: var(--text);
        margin-bottom: 18px;
        letter-spacing: .2px;
    }

    .hero-content .hero-subtitle {
        font-size: 17px;
        line-height: 1.75;
        color: var(--text-muted);
        margin-bottom: 28px;
        max-width: 520px;
    }

    .hero-actions {
        display: flex;
        flex-wrap: wrap;
        gap: 14px;
        margin-bottom: 20px;
    }

    .hero-meta {
        display: flex;
        flex-wrap: wrap;
        gap: 14px 22px;
        font-size: 14px;
        color: var(--text-muted);
    }

    .hero-meta span {
        display: inline-flex;
        align-items: center;
        gap: 6px;
    }

    .hero-meta .meta-dot {
        width: 6px;
        height: 6px;
        background: var(--primary);
        border-radius: 50%;
        display: inline-block;
    }

    .hero-visual {
        display: flex;
        justify-content: center;
        align-items: center;
    }

    .app-mockup {
        width: 320px;
        max-width: 100%;
        height: 560px;
        background-color: #FFFFFF;
        border-radius: 32px;
        border: 1px solid var(--border);
        box-shadow: 0 16px 40px rgba(31,42,40,.12);
        overflow: hidden;
        position: relative;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .app-mockup img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        border-radius: 32px;
    }

    .mockup-badge {
        position: absolute;
        bottom: 16px;
        left: 50%;
        transform: translateX(-50%);
        background: rgba(255,255,255,.95);
        padding: 8px 18px;
        border-radius: 20px;
        font-size: 13px;
        font-weight: 600;
        color: var(--text);
        box-shadow: 0 2px 8px rgba(31,42,40,.12);
        white-space: nowrap;
    }

    /* Feature grid section */
    .topic-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 18px;
    }

    .topic-card {
        background-color: var(--card-bg);
        border: 1px solid var(--border);
        border-radius: var(--radius-card);
        padding: 22px 20px;
        box-shadow: var(--shadow-card);
        transition: var(--transition-base);
        display: flex;
        flex-direction: column;
        min-height: 170px;
    }

    .topic-card:hover {
        box-shadow: var(--shadow-card-hover);
        transform: translateY(-3px);
    }

    .topic-icon {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 44px;
        height: 44px;
        border-radius: 12px;
        font-size: 22px;
        margin-bottom: 14px;
        background: var(--primary-soft);
        color: var(--primary);
        flex-shrink: 0;
    }

    .topic-card h3 {
        font-size: 18px;
        font-weight: 600;
        margin-bottom: 6px;
        color: var(--text);
    }

    .topic-card p {
        font-size: 14px;
        color: var(--text-muted);
        line-height: 1.6;
        margin-bottom: 12px;
        flex-grow: 1;
    }

    .topic-card a {
        font-size: 14px;
        font-weight: 600;
        color: var(--primary);
        display: inline-flex;
        align-items: center;
        gap: 4px;
    }

    .topic-card a:hover {
        color: var(--primary-dark);
    }

    /* Core features */
    .features-grid {
        display: grid;
        grid-template-columns: repeat(5, 1fr);
        gap: 18px;
    }

    .feature-item {
        text-align: center;
        padding: 26px 16px;
        background-color: var(--card-bg);
        border-radius: var(--radius-card);
        border: 1px solid var(--border);
        box-shadow: var(--shadow-card);
        transition: var(--transition-base);
    }

    .feature-item:hover {
        box-shadow: var(--shadow-card-hover);
        transform: translateY(-3px);
    }

    .feature-icon {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 52px;
        height: 52px;
        border-radius: 14px;
        font-size: 26px;
        background: var(--primary-light);
        color: var(--primary);
        margin-bottom: 14px;
    }

    .feature-item h3 {
        font-size: 17px;
        font-weight: 600;
        margin-bottom: 8px;
    }

    .feature-item p {
        font-size: 14px;
        color: var(--text-muted);
        line-height: 1.6;
    }

    /* Download CTA section */
    .download-section {
        background-color: var(--primary);
        color: #FFFFFF;
        text-align: center;
    }

    .download-section .section-title {
        color: #FFFFFF;
    }

    .download-section .section-subtitle {
        color: rgba(255,255,255,.85);
        margin-left: auto;
        margin-right: auto;
    }

    .platform-buttons {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 16px;
        margin-top: 32px;
    }

    .platform-buttons .btn {
        min-width: 180px;
        padding: 14px 26px;
    }

    .download-info {
        margin-top: 22px;
        font-size: 14px;
        color: rgba(255,255,255,.75);
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 14px 28px;
    }

    .download-info span {
        display: inline-flex;
        align-items: center;
        gap: 6px;
    }

    /* Course topics */
    .course-grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .course-card {
        display: flex;
        align-items: center;
        gap: 20px;
        background-color: var(--card-bg);
        border: 1px solid var(--border);
        border-radius: var(--radius-card);
        padding: 20px;
        box-shadow: var(--shadow-card);
        transition: var(--transition-base);
    }

    .course-card:hover {
        box-shadow: var(--shadow-card-hover);
        transform: translateY(-3px);
    }

    .course-card img {
        width: 120px;
        height: 90px;
        object-fit: cover;
        border-radius: 12px;
        flex-shrink: 0;
    }

    .course-card-content h3 {
        font-size: 18px;
        font-weight: 600;
        margin-bottom: 6px;
    }

    .course-card-content p {
        font-size: 14px;
        color: var(--text-muted);
        line-height: 1.6;
        margin-bottom: 8px;
    }

    .course-card-content a {
        font-size: 14px;
        font-weight: 600;
        color: var(--primary);
    }

    /* Advantages */
    .advantages-grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .advantage-card {
        background-color: var(--card-bg);
        border: 1px solid var(--border);
        border-radius: var(--radius-card);
        padding: 26px 24px;
        box-shadow: var(--shadow-card);
        display: flex;
        gap: 16px;
        transition: var(--transition-base);
    }

    .advantage-card:hover {
        box-shadow: var(--shadow-card-hover);
    }

    .advantage-num {
        font-size: 36px;
        font-weight: 700;
        color: var(--primary);
        line-height: 1;
        flex-shrink: 0;
        font-family: var(--font-heading);
    }

    .advantage-content h3 {
        font-size: 18px;
        font-weight: 600;
        margin-bottom: 8px;
    }

    .advantage-content p {
        font-size: 15px;
        color: var(--text-muted);
        line-height: 1.65;
    }

    /* Scenarios */
    .scenario-row {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 40px;
        align-items: center;
        margin-bottom: 36px;
    }

    .scenario-row:last-child {
        margin-bottom: 0;
    }

    .scenario-row.reverse {
        direction: rtl;
    }

    .scenario-row.reverse > * {
        direction: ltr;
    }

    .scenario-image {
        width: 100%;
        height: 260px;
        border-radius: var(--radius-card);
        overflow: hidden;
        background: var(--primary-soft);
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .scenario-image img {
        width: 100%;
        height: 100%;
        object-fit: cover;
    }

    .scenario-content h3 {
        font-size: 22px;
        font-weight: 600;
        margin-bottom: 12px;
    }

    .scenario-content p {
        font-size: 15px;
        color: var(--text-muted);
        line-height: 1.7;
    }

    /* Stats band */
    .stats-band {
        background-color: #FFFFFF;
        border-top: 1px solid var(--border-light);
        border-bottom: 1px solid var(--border-light);
        padding: 48px 0;
    }

    .stats-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 24px;
        text-align: center;
    }

    .stat-item .stat-number {
        font-size: 36px;
        font-weight: 700;
        color: var(--primary);
        line-height: 1.2;
        margin-bottom: 6px;
    }

    .stat-item .stat-label {
        font-size: 15px;
        color: var(--text-muted);
    }

    /* Steps */
    .steps-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
    }

    .step-card {
        text-align: center;
        padding: 28px 20px;
        background-color: var(--card-bg);
        border-radius: var(--radius-card);
        border: 1px solid var(--border);
        box-shadow: var(--shadow-card);
        position: relative;
    }

    .step-number {
        font-size: 40px;
        font-weight: 700;
        color: var(--primary-light);
        line-height: 1;
        margin-bottom: 12px;
        letter-spacing: 1px;
    }

    .step-card h3 {
        font-size: 18px;
        font-weight: 600;
        margin-bottom: 8px;
    }

    .step-card p {
        font-size: 14px;
        color: var(--text-muted);
        line-height: 1.6;
    }

    /* CMS list */
    .cms-list {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
    }

    .cms-card {
        background-color: var(--card-bg);
        border: 1px solid var(--border);
        border-radius: var(--radius-card);
        padding: 22px 20px;
        box-shadow: var(--shadow-card);
        transition: var(--transition-base);
        display: flex;
        flex-direction: column;
    }

    .cms-card:hover {
        box-shadow: var(--shadow-card-hover);
        transform: translateY(-3px);
    }

    .cms-card .cms-tag {
        display: inline-block;
        padding: 4px 12px;
        font-size: 12px;
        font-weight: 600;
        color: var(--primary);
        background-color: var(--primary-soft);
        border-radius: var(--radius-tag);
        margin-bottom: 12px;
        align-self: flex-start;
    }

    .cms-card h3 {
        font-size: 17px;
        font-weight: 600;
        margin-bottom: 8px;
        line-height: 1.45;
    }

    .cms-card h3 a {
        color: var(--text);
    }

    .cms-card h3 a:hover {
        color: var(--primary);
    }

    .cms-card .cms-excerpt {
        font-size: 14px;
        color: var(--text-muted);
        line-height: 1.65;
        margin-bottom: 14px;
        flex-grow: 1;
    }

    .cms-card .cms-meta {
        font-size: 13px;
        color: var(--text-light);
        display: flex;
        justify-content: space-between;
        align-items: center;
        gap: 8px;
        border-top: 1px solid var(--border-light);
        padding-top: 12px;
    }

    .cms-empty {
        text-align: center;
        padding: 40px 0;
        color: var(--text-muted);
        font-size: 15px;
    }

    /* Teachers */
    .teachers-scroll {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 20px;
    }

    .teacher-card {
        background-color: var(--card-bg);
        border: 1px solid var(--border);
        border-radius: var(--radius-card);
        padding: 22px;
        box-shadow: var(--shadow-card);
        text-align: center;
        transition: var(--transition-base);
    }

    .teacher-card:hover {
        box-shadow: var(--shadow-card-hover);
        transform: translateY(-3px);
    }

    .teacher-avatar {
        width: 72px;
        height: 72px;
        border-radius: 50%;
        background: var(--primary-soft);
        margin: 0 auto 14px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 30px;
        color: var(--primary);
        overflow: hidden;
    }

    .teacher-card h3 {
        font-size: 16px;
        font-weight: 600;
        margin-bottom: 4px;
    }

    .teacher-subject {
        font-size: 13px;
        color: var(--primary);
        font-weight: 600;
        margin-bottom: 8px;
    }

    .teacher-tags {
        display: flex;
        flex-wrap: wrap;
        gap: 6px;
        justify-content: center;
        margin-bottom: 10px;
    }

    .teacher-tags span {
        font-size: 12px;
        padding: 3px 10px;
        background-color: var(--bg);
        border-radius: var(--radius-tag);
        color: var(--text-muted);
        border: 1px solid var(--border-light);
    }

    .teacher-bio {
        font-size: 13px;
        color: var(--text-muted);
        line-height: 1.6;
    }

    /* Testimonials */
    .testimonials-grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .testimonial-card {
        background-color: var(--card-bg);
        border: 1px solid var(--border);
        border-radius: var(--radius-card);
        padding: 24px;
        box-shadow: var(--shadow-card);
    }

    .testimonial-stars {
        color: var(--accent);
        font-size: 16px;
        margin-bottom: 12px;
        letter-spacing: 2px;
    }

    .testimonial-text {
        font-size: 15px;
        color: var(--text);
        line-height: 1.7;
        margin-bottom: 14px;
    }

    .testimonial-author {
        font-size: 14px;
        color: var(--text-muted);
        font-weight: 600;
    }

    /* FAQ */
    .faq-list {
        max-width: 780px;
        margin: 0 auto;
        display: flex;
        flex-direction: column;
        gap: 10px;
    }

    .faq-item {
        background-color: #FFFFFF;
        border: 1px solid var(--border);
        border-radius: 12px;
        overflow: hidden;
    }

    .faq-question {
        width: 100%;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 14px;
        padding: 16px 20px;
        font-size: 15px;
        font-weight: 600;
        color: var(--text);
        text-align: left;
        background-color: #FFFFFF;
        border: none;
        cursor: pointer;
    }

    .faq-question:hover {
        color: var(--primary);
    }

    .faq-icon {
        flex-shrink: 0;
        width: 24px;
        height: 24px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 18px;
        color: var(--text-muted);
        transition: transform .22s ease;
    }

    .faq-item.open .faq-icon {
        transform: rotate(45deg);
        color: var(--primary);
    }

    .faq-answer {
        max-height: 0;
        overflow: hidden;
        transition: max-height .28s ease;
        background-color: #F7F5F1;
    }

    .faq-item.open .faq-answer {
        max-height: 240px;
    }

    .faq-answer-inner {
        padding: 14px 20px 18px;
        font-size: 14px;
        color: var(--text-muted);
        line-height: 1.7;
    }

    /* Version timeline */
    .timeline {
        position: relative;
        max-width: 640px;
        margin: 0 auto;
        padding-left: 28px;
    }

    .timeline::before {
        content: "";
        position: absolute;
        left: 8px;
        top: 6px;
        bottom: 6px;
        width: 2px;
        background: var(--border);
        border-radius: 2px;
    }

    .timeline-item {
        position: relative;
        padding-bottom: 24px;
    }

    .timeline-item:last-child {
        padding-bottom: 0;
    }

    .timeline-item::before {
        content: "";
        position: absolute;
        left: -25px;
        top: 6px;
        width: 12px;
        height: 12px;
        background: var(--primary);
        border-radius: 50%;
        border: 3px solid #FFFFFF;
        box-shadow: 0 0 0 3px var(--border-light);
    }

    .timeline-version {
        font-size: 14px;
        font-weight: 700;
        color: var(--primary);
        margin-bottom: 4px;
    }

    .timeline-date {
        font-size: 13px;
        color: var(--text-light);
        margin-bottom: 6px;
    }

    .timeline-desc {
        font-size: 14px;
        color: var(--text-muted);
        line-height: 1.65;
    }

    /* Activities */
    .activities-grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .activity-card {
        border-radius: var(--radius-card);
        overflow: hidden;
        background: var(--card-bg);
        border: 1px solid var(--border);
        box-shadow: var(--shadow-card);
        display: flex;
        flex-direction: column;
    }

    .activity-card img {
        width: 100%;
        height: 180px;
        object-fit: cover;
    }

    .activity-content {
        padding: 20px;
        flex-grow: 1;
        display: flex;
        flex-direction: column;
    }

    .activity-content h3 {
        font-size: 18px;
        font-weight: 600;
        margin-bottom: 8px;
    }

    .activity-content p {
        font-size: 14px;
        color: var(--text-muted);
        line-height: 1.65;
        margin-bottom: 14px;
        flex-grow: 1;
    }

    .activity-content .btn {
        align-self: flex-start;
    }

    /* Contact */
    .contact-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 20px;
    }

    .contact-card {
        background-color: var(--card-bg);
        border: 1px solid var(--border);
        border-radius: var(--radius-card);
        padding: 22px;
        box-shadow: var(--shadow-card);
        text-align: center;
    }

    .contact-icon {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 48px;
        height: 48px;
        border-radius: 12px;
        font-size: 22px;
        background: var(--primary-soft);
        color: var(--primary);
        margin-bottom: 12px;
    }

    .contact-card h3 {
        font-size: 16px;
        font-weight: 600;
        margin-bottom: 8px;
    }

    .contact-card p {
        font-size: 14px;
        color: var(--text-muted);
        line-height: 1.6;
    }

    /* Pre-footer CTA */
    .pre-footer-cta {
        background-color: var(--footer-bg);
        padding: 36px 0;
        color: #FFFFFF;
    }

    .pre-footer-inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 20px;
        flex-wrap: wrap;
    }

    .pre-footer-inner h2 {
        font-size: 22px;
        font-weight: 700;
        color: #FFFFFF;
    }

    .pre-footer-inner .btn {
        flex-shrink: 0;
    }

    /* Footer */
    .site-footer {
        background-color: var(--footer-bg);
        border-top: 1px solid rgba(255,255,255,.08);
        padding: 52px 0 24px;
        color: var(--footer-text);
    }

    .footer-grid {
        display: grid;
        grid-template-columns: 1.4fr 1fr 1fr .8fr;
        gap: 32px;
        margin-bottom: 36px;
    }

    .footer-brand .logo {
        color: #FFFFFF;
        font-size: 20px;
        margin-bottom: 14px;
    }

    .footer-brand .logo .logo-mark {
        background: var(--accent);
        color: #1F2A28;
    }

    .footer-brand p {
        font-size: 14px;
        line-height: 1.7;
        color: var(--footer-text);
        max-width: 260px;
    }

    .footer-col h4 {
        color: var(--footer-heading);
        font-size: 15px;
        font-weight: 600;
        margin-bottom: 14px;
        letter-spacing: .3px;
    }

    .footer-col ul {
        display: flex;
        flex-direction: column;
        gap: 8px;
    }

    .footer-col a {
        color: var(--footer-text);
        font-size: 14px;
        transition: color .18s ease;
    }

    .footer-col a:hover {
        color: #FFFFFF;
    }

    .footer-qr {
        width: 110px;
        height: 110px;
        background-color: #FFFFFF;
        border-radius: 10px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 12px;
        color: var(--text-muted);
        margin-bottom: 8px;
        text-align: center;
        line-height: 1.4;
        padding: 6px;
    }

    .footer-bottom {
        border-top: 1px solid rgba(255,255,255,.08);
        padding-top: 20px;
        font-size: 13px;
        color: rgba(255,255,255,.55);
        text-align: center;
        line-height: 1.6;
    }

    .footer-bottom .domain {
        color: rgba(255,255,255,.7);
        font-weight: 500;
    }

    /* Back to top */
    .back-to-top {
        position: fixed;
        bottom: 24px;
        right: 24px;
        width: 44px;
        height: 44px;
        border-radius: 50%;
        background: var(--primary);
        color: #FFFFFF;
        display: none;
        align-items: center;
        justify-content: center;
        font-size: 20px;
        box-shadow: 0 4px 16px rgba(14,122,95,.35);
        z-index: 900;
        transition: var(--transition-base);
        border: none;
    }

    .back-to-top:hover {
        background: var(--primary-dark);
        transform: translateY(-2px);
    }

    .back-to-top.visible {
        display: flex;
    }

    /* Responsive */
    @media (max-width: 1024px) {
        .topic-grid {
            grid-template-columns: repeat(2, 1fr);
        }

        .features-grid {
            grid-template-columns: repeat(3, 1fr);
        }

        .teachers-scroll {
            grid-template-columns: repeat(2, 1fr);
        }

        .stats-grid {
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }

        .cms-list {
            grid-template-columns: repeat(2, 1fr);
        }

        .hero-grid {
            grid-template-columns: 1fr;
            gap: 40px;
            text-align: center;
        }

        .hero-content .hero-subtitle {
            margin-left: auto;
            margin-right: auto;
        }

        .hero-actions {
            justify-content: center;
        }

        .hero-meta {
            justify-content: center;
        }

        .scenario-row,
        .scenario-row.reverse {
            grid-template-columns: 1fr;
            direction: ltr;
            gap: 24px;
        }

        .scenario-image {
            height: 220px;
        }

        .footer-grid {
            grid-template-columns: repeat(2, 1fr);
        }

        .contact-grid {
            grid-template-columns: repeat(2, 1fr);
        }

        .course-grid {
            grid-template-columns: 1fr;
        }

        .advantages-grid {
            grid-template-columns: 1fr;
        }

        .activities-grid {
            grid-template-columns: 1fr;
        }

        .testimonials-grid {
            grid-template-columns: 1fr;
        }
    }

    @media (max-width: 768px) {
        .main-nav {
            display: none;
        }

        .hamburger {
            display: flex;
        }

        .mobile-drawer {
            display: block;
        }

        .header-cta {
            display: none;
        }

        .site-header {
            height: 64px;
        }

        .mobile-drawer {
            top: 64px;
        }

        .announcement-bar {
            margin-top: 64px;
        }

        .hero {
            padding: 56px 0 64px;
        }

        .hero-content h1 {
            font-size: 30px;
        }

        .section {
            padding: var(--section-pad-mobile) 0;
        }

        .section-title {
            font-size: 24px;
        }

        .topic-grid {
            grid-template-columns: 1fr;
        }

        .features-grid {
            grid-template-columns: 1fr 1fr;
        }

        .teachers-scroll {
            grid-template-columns: 1fr;
        }

        .cms-list {
            grid-template-columns: 1fr;
        }

        .steps-grid {
            grid-template-columns: 1fr;
        }

        .stats-grid {
            grid-template-columns: 1fr 1fr;
        }

        .footer-grid {
            grid-template-columns: 1fr;
        }

        .contact-grid {
            grid-template-columns: 1fr;
        }

        .app-mockup {
            width: 260px;
            height: 440px;
        }

        .pre-footer-inner {
            flex-direction: column;
            text-align: center;
        }

        .pre-footer-inner .btn {
            width: 100%;
        }

        .platform-buttons .btn {
            min-width: 150px;
        }
    }

    @media (max-width: 520px) {
        .hero-content h1 {
            font-size: 26px;
        }

        .section-title {
            font-size: 22px;
        }

        .topic-grid {
            grid-template-columns: 1fr;
        }

        .features-grid {
            grid-template-columns: 1fr;
        }

        .stats-grid {
            grid-template-columns: 1fr;
        }

        .btn-lg {
            padding: 12px 20px;
            font-size: 15px;
        }

        .platform-buttons {
            flex-direction: column;
        }

        .platform-buttons .btn {
            width: 100%;
        }

        .hero-actions {
            flex-direction: column;
        }

        .hero-actions .btn {
            width: 100%;
        }

        .announcement-bar {
            font-size: 13px;
            padding: 8px 12px;
        }

        .app-mockup {
            width: 220px;
            height: 380px;
            border-radius: 24px;
        }

        .mockup-badge {
            font-size: 11px;
            padding: 6px 12px;
        }
    }

/* roulang page: article */
:root {
            --primary: #0E7A5F;
            --primary-dark: #0A5F4A;
            --primary-light: #E6F2EE;
            --primary-soft: #F0F7F4;
            --accent: #F5A623;
            --accent-dark: #D88B0A;
            --accent-light: #FFF4DE;
            --bg: #FAF7F2;
            --card-bg: #FFFFFF;
            --text: #1F2A28;
            --text-muted: #66736F;
            --text-light: #8A9692;
            --border: #E4E0D9;
            --border-light: #EDE9E2;
            --danger: #D9534F;
            --footer-bg: #15322B;
            --footer-text: #B8C9C2;
            --footer-heading: #EDF3F0;
            --radius-card: 16px;
            --radius-btn: 10px;
            --radius-tag: 20px;
            --radius-input: 10px;
            --shadow-card: 0 2px 8px rgba(31,42,40,.05);
            --shadow-card-hover: 0 8px 24px rgba(14,122,95,.12);
            --shadow-nav: 0 2px 12px rgba(31,42,40,.08);
            --transition-base: all .22s ease;
            --container-max: 1200px;
            --section-pad-desktop: 72px;
            --section-pad-mobile: 36px;
            --font-heading: "PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,sans-serif;
            --font-body: "PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,sans-serif;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-body);
            font-size: 16px;
            line-height: 1.75;
            color: var(--text);
            background-color: var(--bg);
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-top: 72px;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border: 0;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition-base);
        }

        a:hover {
            color: var(--primary-dark);
        }

        a:focus,
        button:focus,
        input:focus {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }

        button {
            font-family: var(--font-body);
            cursor: pointer;
            border: none;
            background: none;
            transition: var(--transition-base);
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
            width: 100%;
        }

        /* Header / Navigation */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background-color: #FFFFFF;
            height: 72px;
            display: flex;
            align-items: center;
            border-bottom: 1px solid var(--border-light);
            transition: box-shadow .25s ease, background-color .25s ease;
        }

        .site-header.scrolled {
            box-shadow: var(--shadow-nav);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            width: 100%;
        }

        .logo {
            flex-shrink: 0;
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 20px;
            color: var(--text);
            letter-spacing: .5px;
            white-space: nowrap;
        }

        .logo:hover {
            color: var(--primary);
        }

        .logo .logo-mark {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: var(--primary);
            color: #FFFFFF;
            border-radius: 10px;
            font-size: 18px;
            font-weight: 700;
            flex-shrink: 0;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .main-nav a {
            display: inline-flex;
            align-items: center;
            padding: 8px 14px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text);
            border-radius: 8px;
            white-space: nowrap;
            position: relative;
            transition: color .18s ease, background-color .18s ease;
        }

        .main-nav a:hover {
            color: var(--primary);
            background-color: var(--primary-soft);
        }

        .main-nav a.active {
            color: var(--primary);
            background-color: var(--primary-soft);
        }

        .main-nav a.active::after {
            content: "";
            position: absolute;
            bottom: 2px;
            left: 14px;
            right: 14px;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
        }

        .header-cta {
            flex-shrink: 0;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 22px;
            font-size: 15px;
            font-weight: 600;
            border-radius: var(--radius-btn);
            transition: var(--transition-base);
            text-align: center;
            line-height: 1.4;
            border: 1px solid transparent;
            white-space: nowrap;
        }

        .btn:hover {
            text-decoration: none;
        }

        .btn-primary {
            background-color: var(--primary);
            color: #FFFFFF;
            border-color: var(--primary);
        }

        .btn-primary:hover {
            background-color: var(--primary-dark);
            border-color: var(--primary-dark);
            color: #FFFFFF;
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(14,122,95,.25);
        }

        .btn-primary:active {
            transform: translateY(1px);
            box-shadow: none;
        }

        .btn-secondary {
            background-color: transparent;
            color: var(--primary);
            border-color: var(--primary);
        }

        .btn-secondary:hover {
            background-color: var(--primary-light);
            color: var(--primary-dark);
            transform: translateY(-1px);
        }

        .btn-secondary:active {
            transform: translateY(1px);
        }

        .btn-accent {
            background-color: var(--accent);
            color: #FFFFFF;
            border-color: var(--accent);
        }

        .btn-accent:hover {
            background-color: var(--accent-dark);
            border-color: var(--accent-dark);
            color: #FFFFFF;
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(245,166,35,.25);
        }

        .btn-lg {
            padding: 14px 28px;
            font-size: 16px;
        }

        .btn-sm {
            padding: 8px 16px;
            font-size: 14px;
        }

        /* Mobile nav toggle */
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            width: 40px;
            height: 40px;
            background: transparent;
            border: 1px solid var(--border);
            border-radius: 8px;
            align-items: center;
            justify-content: center;
            cursor: pointer;
        }

        .nav-toggle span {
            display: block;
            width: 20px;
            height: 2px;
            background: var(--text);
            transition: var(--transition-base);
        }

        .nav-toggle.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }

        .nav-toggle.open span:nth-child(2) {
            opacity: 0;
        }

        .nav-toggle.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* Article page sections */
        .article-section {
            padding: var(--section-pad-desktop) 0;
        }

        .article-section-alt {
            background-color: var(--card-bg);
        }

        .section-title {
            font-family: var(--font-heading);
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 24px;
            color: var(--text);
            line-height: 1.35;
        }

        .section-subtitle {
            color: var(--text-muted);
            font-size: 17px;
            margin-bottom: 32px;
            line-height: 1.75;
        }

        .breadcrumb-wrap {
            background: var(--primary-soft);
            border-bottom: 1px solid var(--border-light);
            padding: 20px 0;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-muted);
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: var(--primary);
        }

        .breadcrumb .separator {
            color: var(--text-light);
        }

        .breadcrumb .current {
            color: var(--text);
            font-weight: 500;
        }

        .article-header {
            padding: 40px 0 24px;
        }

        .article-header h1 {
            font-family: var(--font-heading);
            font-size: 36px;
            font-weight: 700;
            line-height: 1.35;
            margin-bottom: 20px;
            color: var(--text);
        }

        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 16px 24px;
            font-size: 14px;
            color: var(--text-muted);
        }

        .article-meta .meta-item {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .article-meta .meta-icon {
            font-size: 16px;
        }

        .article-category-tag {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary-dark);
            padding: 4px 12px;
            border-radius: var(--radius-tag);
            font-size: 13px;
            font-weight: 600;
        }

        .article-cover {
            width: 100%;
            aspect-ratio: 16 / 9;
            background-color: #EFF2F0;
            border-radius: var(--radius-card);
            overflow: hidden;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-muted);
            font-size: 16px;
            letter-spacing: 1px;
            margin-bottom: 40px;
        }

        .article-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .article-cover-placeholder {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 12px;
            color: var(--text-light);
        }

        .article-cover-placeholder .cover-icon {
            font-size: 48px;
        }

        .article-content {
            max-width: 800px;
            margin: 0 auto;
            line-height: 1.82;
            font-size: 17px;
            color: var(--text);
        }

        .article-content h2 {
            font-family: var(--font-heading);
            font-size: 26px;
            font-weight: 700;
            margin: 40px 0 16px;
            line-height: 1.4;
        }

        .article-content h3 {
            font-family: var(--font-heading);
            font-size: 22px;
            font-weight: 600;
            margin: 32px 0 12px;
            line-height: 1.4;
        }

        .article-content p {
            margin-bottom: 20px;
        }

        .article-content ul,
        .article-content ol {
            margin: 0 0 20px 24px;
        }

        .article-content li {
            margin-bottom: 8px;
        }

        .article-content blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-soft);
            padding: 16px 20px;
            margin: 24px 0;
            border-radius: 0 var(--radius-card) var(--radius-card) 0;
            color: var(--text-muted);
            font-style: italic;
        }

        .article-content img {
            border-radius: var(--radius-card);
            margin: 24px auto;
        }

        .article-content .no-article {
            text-align: center;
            padding: 60px 0;
            color: var(--text-muted);
        }

        .article-download-cta {
            background: var(--primary-soft);
            border: 1px solid var(--primary-light);
            border-radius: var(--radius-card);
            padding: 28px 32px;
            margin: 40px auto;
            max-width: 800px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
        }

        .article-download-cta .cta-text {
            font-size: 18px;
            font-weight: 600;
            color: var(--text);
        }

        .article-download-cta .cta-text small {
            display: block;
            font-weight: 400;
            font-size: 14px;
            color: var(--text-muted);
            margin-top: 4px;
        }

        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            max-width: 800px;
            margin: 24px auto 40px;
        }

        .tag-pill {
            display: inline-block;
            background: var(--card-bg);
            border: 1px solid var(--border);
            color: var(--text-muted);
            padding: 6px 16px;
            border-radius: var(--radius-tag);
            font-size: 13px;
            font-weight: 500;
            transition: var(--transition-base);
        }

        .tag-pill:hover {
            border-color: var(--primary);
            color: var(--primary);
        }

        .related-card {
            background: var(--card-bg);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-card);
            padding: 24px;
            transition: var(--transition-base);
            height: 100%;
            display: flex;
            flex-direction: column;
        }

        .related-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }

        .related-card h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 12px;
            line-height: 1.5;
        }

        .related-card h3 a {
            color: var(--text);
        }

        .related-card h3 a:hover {
            color: var(--primary);
        }

        .related-card .related-summary {
            color: var(--text-muted);
            font-size: 15px;
            flex-grow: 1;
            margin-bottom: 16px;
        }

        .related-card .related-date {
            font-size: 13px;
            color: var(--text-light);
        }

        .back-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin: 20px 0;
        }

        .service-card {
            background: var(--card-bg);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-card);
            padding: 32px;
            display: flex;
            flex-wrap: wrap;
            gap: 28px;
            align-items: flex-start;
        }

        .service-item {
            flex: 1 1 200px;
        }

        .service-item .service-icon {
            font-size: 28px;
            margin-bottom: 12px;
        }

        .service-item h4 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .service-item p {
            color: var(--text-muted);
            font-size: 15px;
        }

        .article-footer-cta {
            background: var(--primary);
            padding: 40px 0;
            text-align: center;
            color: #FFFFFF;
        }

        .article-footer-cta .cta-inner {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: center;
            gap: 20px;
        }

        .article-footer-cta h2 {
            font-size: 26px;
            font-weight: 700;
            margin: 0;
        }

        .article-footer-cta .btn-accent {
            background-color: #FFFFFF;
            color: var(--primary);
            border-color: #FFFFFF;
        }

        .article-footer-cta .btn-accent:hover {
            background-color: var(--accent-light);
            border-color: var(--accent-light);
            color: var(--accent-dark);
        }

        /* Footer */
        .site-footer {
            background-color: var(--footer-bg);
            color: var(--footer-text);
            padding: 60px 0 20px;
            font-size: 15px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-brand .logo {
            color: #FFFFFF;
            margin-bottom: 16px;
        }

        .footer-brand .logo:hover {
            color: var(--accent);
        }

        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            color: var(--footer-text);
            max-width: 280px;
        }

        .footer-col h4 {
            color: var(--footer-heading);
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .footer-col ul {
            list-style: none;
            padding: 0;
        }

        .footer-col li {
            margin-bottom: 10px;
        }

        .footer-col a {
            color: var(--footer-text);
            font-size: 14px;
            transition: var(--transition-base);
        }

        .footer-col a:hover {
            color: #FFFFFF;
            padding-left: 4px;
        }

        .footer-qr {
            width: 120px;
            height: 120px;
            background: rgba(255,255,255,.08);
            border: 1px dashed rgba(255,255,255,.25);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 13px;
            color: var(--footer-text);
            margin-bottom: 12px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,.08);
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 12px;
            font-size: 13px;
            color: var(--footer-text);
        }

        .footer-bottom .domain {
            color: var(--accent);
            font-weight: 600;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .main-nav {
                gap: 0;
            }
            .main-nav a {
                padding: 8px 10px;
                font-size: 14px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .nav-toggle {
                display: flex;
            }
            .main-nav {
                position: fixed;
                top: 72px;
                left: 0;
                right: 0;
                background: #FFFFFF;
                flex-direction: column;
                align-items: flex-start;
                padding: 20px;
                gap: 8px;
                box-shadow: var(--shadow-nav);
                display: none;
                z-index: 999;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                width: 100%;
                padding: 12px 16px;
                font-size: 16px;
            }
            .main-nav a.active::after {
                left: 16px;
                right: auto;
                width: 24px;
                height: 2px;
                bottom: 8px;
            }
            .header-cta {
                margin-left: auto;
            }
            .header-cta .btn {
                padding: 10px 16px;
                font-size: 14px;
            }
            .article-header h1 {
                font-size: 28px;
            }
            .article-content {
                font-size: 16px;
            }
            .article-content h2 {
                font-size: 22px;
            }
            .article-content h3 {
                font-size: 20px;
            }
            .article-download-cta {
                flex-direction: column;
                align-items: flex-start;
                padding: 24px;
            }
            .service-card {
                flex-direction: column;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        @media (max-width: 480px) {
            :root {
                --section-pad-desktop: 40px;
                --section-pad-mobile: 28px;
            }
            .article-header h1 {
                font-size: 24px;
            }
            .article-meta {
                font-size: 13px;
                gap: 10px 16px;
            }
            .article-content {
                font-size: 15px;
            }
            .btn-lg {
                padding: 12px 20px;
                font-size: 15px;
                width: 100%;
                justify-content: center;
            }
        }

/* roulang page: category1 */
:root {
            --primary: #0E7A5F;
            --primary-dark: #0A5F4A;
            --primary-light: #E6F2EE;
            --primary-soft: #F0F7F4;
            --accent: #F5A623;
            --accent-dark: #D88B0A;
            --accent-light: #FFF4DE;
            --bg: #FAF7F2;
            --card-bg: #FFFFFF;
            --text: #1F2A28;
            --text-muted: #66736F;
            --text-light: #8A9692;
            --border: #E4E0D9;
            --border-light: #EDE9E2;
            --danger: #D9534F;
            --footer-bg: #15322B;
            --footer-text: #B8C9C2;
            --footer-heading: #EDF3F0;
            --radius-card: 16px;
            --radius-btn: 10px;
            --radius-tag: 20px;
            --radius-input: 10px;
            --shadow-card: 0 2px 8px rgba(31,42,40,.05);
            --shadow-card-hover: 0 8px 24px rgba(14,122,95,.12);
            --shadow-nav: 0 2px 12px rgba(31,42,40,.08);
            --transition-base: all .22s ease;
            --container-max: 1200px;
            --section-pad-desktop: 72px;
            --section-pad-mobile: 36px;
            --font-heading: "PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,sans-serif;
            --font-body: "PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,sans-serif;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-body);
            font-size: 16px;
            line-height: 1.75;
            color: var(--text);
            background-color: var(--bg);
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border: 0;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition-base);
        }
        a:hover {
            color: var(--primary-dark);
        }
        a:focus,
        button:focus,
        input:focus {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }
        button {
            font-family: var(--font-body);
            cursor: pointer;
            border: none;
            background: none;
            transition: var(--transition-base);
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
            width: 100%;
        }
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background-color: #FFFFFF;
            height: 72px;
            display: flex;
            align-items: center;
            border-bottom: 1px solid var(--border-light);
            transition: box-shadow .25s ease, background-color .25s ease;
        }
        .site-header.scrolled {
            box-shadow: var(--shadow-nav);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            width: 100%;
        }
        .logo {
            flex-shrink: 0;
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 20px;
            color: var(--text);
            letter-spacing: .5px;
            white-space: nowrap;
        }
        .logo:hover {
            color: var(--primary);
        }
        .logo .logo-mark {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: var(--primary);
            color: #FFFFFF;
            border-radius: 10px;
            font-size: 18px;
            font-weight: 700;
            flex-shrink: 0;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .main-nav a {
            display: inline-flex;
            align-items: center;
            padding: 8px 14px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text);
            border-radius: 8px;
            white-space: nowrap;
            position: relative;
            transition: color .18s ease, background-color .18s ease;
        }
        .main-nav a:hover {
            color: var(--primary);
            background-color: var(--primary-soft);
        }
        .main-nav a.active {
            color: var(--primary);
            background-color: var(--primary-soft);
        }
        .main-nav a.active::after {
            content: "";
            position: absolute;
            bottom: 2px;
            left: 14px;
            right: 14px;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
        }
        .header-cta {
            flex-shrink: 0;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 22px;
            font-size: 15px;
            font-weight: 600;
            border-radius: var(--radius-btn);
            transition: var(--transition-base);
            text-align: center;
            line-height: 1.4;
            border: 1px solid transparent;
            white-space: nowrap;
        }
        .btn:hover {
            text-decoration: none;
        }
        .btn-primary {
            background-color: var(--primary);
            color: #FFFFFF;
            border-color: var(--primary);
        }
        .btn-primary:hover {
            background-color: var(--primary-dark);
            border-color: var(--primary-dark);
            color: #FFFFFF;
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(14,122,95,.25);
        }
        .btn-primary:active {
            transform: translateY(1px);
            box-shadow: none;
        }
        .btn-secondary {
            background-color: transparent;
            color: var(--primary);
            border-color: var(--primary);
        }
        .btn-secondary:hover {
            background-color: var(--primary-light);
            color: var(--primary-dark);
            border-color: var(--primary);
        }
        .btn-outline-light {
            background-color: transparent;
            color: #FFFFFF;
            border-color: #FFFFFF;
        }
        .btn-outline-light:hover {
            background-color: rgba(255,255,255,.15);
            color: #FFFFFF;
            border-color: #FFFFFF;
        }
        .btn-accent {
            background-color: var(--accent);
            color: #1F2A28;
            border-color: var(--accent);
        }
        .btn-accent:hover {
            background-color: var(--accent-dark);
            border-color: var(--accent-dark);
            color: #1F2A28;
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(245,166,35,.25);
        }
        .text-primary { color: var(--primary) !important; }
        .text-accent { color: var(--accent) !important; }
        .text-muted { color: var(--text-muted) !important; }
        .text-light-muted { color: var(--text-light) !important; }
        .bg-primary-soft { background-color: var(--primary-soft); }
        .bg-light-accent { background-color: var(--accent-light); }
        .section-title {
            font-family: var(--font-heading);
            font-size: 30px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 12px;
            line-height: 1.3;
        }
        .section-subtitle {
            font-size: 16px;
            color: var(--text-muted);
            margin-bottom: 0;
        }
        .section-header {
            margin-bottom: 32px;
        }
        .section-pad {
            padding-top: var(--section-pad-desktop);
            padding-bottom: var(--section-pad-desktop);
        }
        .bg-white { background-color: #FFFFFF; }
        .bg-soft { background-color: var(--bg); }

        /* 分类页头部 */
        .category-hero {
            padding-top: 96px;
            padding-bottom: 32px;
            background: linear-gradient(180deg, var(--primary-soft) 0%, var(--bg) 100%);
            border-bottom: 1px solid var(--border-light);
        }
        .breadcrumb-text {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 12px;
        }
        .breadcrumb-text .separator {
            margin: 0 6px;
            color: var(--text-light);
        }
        .category-hero h1 {
            font-family: var(--font-heading);
            font-size: 34px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 12px;
            line-height: 1.3;
        }
        .category-hero .category-desc {
            font-size: 15px;
            color: var(--text-muted);
            max-width: 720px;
            line-height: 1.8;
        }

        /* 筛选条 */
        .filter-bar {
            background-color: #FFFFFF;
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 12px 20px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 12px;
            box-shadow: var(--shadow-card);
        }
        .filter-bar .filter-label {
            font-size: 14px;
            font-weight: 600;
            color: var(--text);
            margin-right: 4px;
        }
        .filter-tag {
            display: inline-flex;
            align-items: center;
            padding: 6px 16px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-muted);
            border-radius: var(--radius-tag);
            background-color: var(--bg);
            border: 1px solid var(--border-light);
            transition: var(--transition-base);
            cursor: default;
        }
        .filter-tag:hover,
        .filter-tag.active {
            background-color: var(--primary-light);
            color: var(--primary);
            border-color: var(--primary);
        }
        .filter-tag.active {
            font-weight: 600;
        }

        /* 内容卡片网格 */
        .content-card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .content-card {
            background: var(--card-bg);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            overflow: hidden;
            transition: var(--transition-base);
            display: flex;
            flex-direction: column;
        }
        .content-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-card-hover);
            border-color: var(--border);
        }
        .content-card .card-img {
            aspect-ratio: 16/9;
            background-color: var(--primary-soft);
            overflow: hidden;
            position: relative;
        }
        .content-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .content-card .card-body {
            padding: 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .content-card .card-tag {
            display: inline-flex;
            align-self: flex-start;
            padding: 4px 12px;
            font-size: 13px;
            font-weight: 500;
            border-radius: var(--radius-tag);
            background-color: var(--primary-light);
            color: var(--primary);
            margin-bottom: 10px;
        }
        .content-card .card-title {
            font-family: var(--font-heading);
            font-size: 18px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .content-card .card-title a {
            color: var(--text);
        }
        .content-card .card-title a:hover {
            color: var(--primary);
        }
        .content-card .card-summary {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 14px;
            flex: 1;
        }
        .content-card .card-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 13px;
            color: var(--text-light);
        }
        .content-card .card-meta .date {
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .content-card .card-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 4px;
            transition: var(--transition-base);
        }
        .content-card .card-link:hover {
            color: var(--primary-dark);
            gap: 8px;
        }

        /* 查看更多 */
        .view-more-wrap {
            text-align: center;
            margin-top: 28px;
        }

        /* 下载横条 */
        .download-strip {
            background: var(--primary);
            border-radius: var(--radius-card);
            padding: 32px 36px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            color: #FFFFFF;
            box-shadow: var(--shadow-card-hover);
        }
        .download-strip .strip-text {
            flex: 1;
            min-width: 260px;
        }
        .download-strip .strip-title {
            font-family: var(--font-heading);
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 6px;
            color: #FFFFFF;
        }
        .download-strip .strip-desc {
            font-size: 14px;
            opacity: .9;
            color: #FFFFFF;
        }
        .download-strip .strip-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            flex-shrink: 0;
        }

        /* 提示卡 */
        .tip-card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .tip-card {
            background: #FFFFFF;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-card);
            padding: 24px;
            box-shadow: var(--shadow-card);
            transition: var(--transition-base);
        }
        .tip-card:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-card-hover);
        }
        .tip-card .tip-icon {
            width: 44px;
            height: 44px;
            background: var(--primary-soft);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            margin-bottom: 14px;
            color: var(--primary);
        }
        .tip-card .tip-title {
            font-family: var(--font-heading);
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text);
        }
        .tip-card .tip-desc {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* FAQ */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            background: #FFFFFF;
            margin-bottom: 12px;
            overflow: hidden;
            transition: var(--transition-base);
        }
        .faq-item:hover {
            border-color: var(--primary-light);
        }
        .faq-question {
            width: 100%;
            padding: 18px 22px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            background: #FFFFFF;
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            text-align: left;
            transition: var(--transition-base);
        }
        .faq-question:hover {
            background-color: var(--primary-soft);
            color: var(--primary);
        }
        .faq-question .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--primary-soft);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            font-weight: 700;
            color: var(--primary);
            transition: var(--transition-base);
        }
        .faq-question[aria-expanded="true"] .faq-icon {
            background: var(--primary);
            color: #FFFFFF;
            transform: rotate(45deg);
        }
        .faq-answer {
            padding: 0 22px 18px;
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.8;
            display: none;
        }
        .faq-answer.open {
            display: block;
        }

        /* 数据信任卡 */
        .trust-card-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .trust-card {
            background: #FFFFFF;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-card);
            padding: 22px;
            text-align: center;
            box-shadow: var(--shadow-card);
            transition: var(--transition-base);
        }
        .trust-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-card-hover);
        }
        .trust-card .trust-number {
            font-family: var(--font-heading);
            font-size: 28px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 6px;
        }
        .trust-card .trust-label {
            font-size: 14px;
            color: var(--text-muted);
        }

        /* CTA 横条 */
        .cta-strip {
            background: var(--footer-bg);
            border-radius: var(--radius-card);
            padding: 36px 40px;
            text-align: center;
            color: #FFFFFF;
        }
        .cta-strip .cta-title {
            font-family: var(--font-heading);
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 8px;
            color: #FFFFFF;
        }
        .cta-strip .cta-sub {
            font-size: 15px;
            opacity: .85;
            margin-bottom: 20px;
            color: #FFFFFF;
        }

        /* 页脚 */
        .site-footer {
            background-color: var(--footer-bg);
            color: var(--footer-text);
            padding-top: 48px;
            padding-bottom: 28px;
            margin-top: 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 32px;
            margin-bottom: 32px;
        }
        .footer-brand .logo {
            color: #FFFFFF;
            margin-bottom: 12px;
        }
        .footer-brand .logo:hover {
            color: #FFFFFF;
        }
        .footer-brand .logo .logo-mark {
            background: var(--primary);
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            color: var(--footer-text);
            margin-bottom: 0;
        }
        .footer-col h4 {
            font-family: var(--font-heading);
            font-size: 16px;
            font-weight: 600;
            color: var(--footer-heading);
            margin-bottom: 14px;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col ul li {
            margin-bottom: 8px;
        }
        .footer-col ul li a {
            font-size: 14px;
            color: var(--footer-text);
            transition: var(--transition-base);
        }
        .footer-col ul li a:hover {
            color: #FFFFFF;
            padding-left: 4px;
        }
        .footer-qr {
            width: 100px;
            height: 100px;
            background: rgba(255,255,255,.08);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 12px;
            color: var(--footer-text);
            margin-bottom: 8px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,.1);
            padding-top: 18px;
            text-align: center;
            font-size: 13px;
            color: var(--footer-text);
        }
        .footer-bottom p {
            margin-bottom: 4px;
        }
        .footer-bottom .domain {
            color: #FFFFFF;
            font-weight: 600;
        }

        /* 移动端导航 */
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            padding: 8px;
            cursor: pointer;
        }
        .nav-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--text);
            border-radius: 2px;
            transition: var(--transition-base);
        }
        .nav-toggle.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .nav-toggle.open span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }
        .mobile-nav {
            display: none;
            position: fixed;
            top: 72px;
            left: 0;
            right: 0;
            background: #FFFFFF;
            border-bottom: 1px solid var(--border-light);
            box-shadow: var(--shadow-nav);
            padding: 16px 20px;
            z-index: 999;
        }
        .mobile-nav.open {
            display: block;
        }
        .mobile-nav a {
            display: block;
            padding: 12px 16px;
            font-size: 16px;
            font-weight: 500;
            color: var(--text);
            border-radius: 8px;
            transition: var(--transition-base);
        }
        .mobile-nav a:hover,
        .mobile-nav a.active {
            background-color: var(--primary-soft);
            color: var(--primary);
        }
        .mobile-nav .mobile-cta {
            margin-top: 12px;
            padding: 12px 16px;
        }

        /* 响应式 */
        @media (max-width: 1024px) {
            .content-card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .tip-card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .trust-card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
        }
        @media (max-width: 768px) {
            .main-nav {
                display: none;
            }
            .nav-toggle {
                display: flex;
            }
            .header-cta {
                display: none;
            }
            .site-header {
                height: 64px;
            }
            .mobile-nav {
                top: 64px;
            }
            .section-pad {
                padding-top: var(--section-pad-mobile);
                padding-bottom: var(--section-pad-mobile);
            }
            .section-title {
                font-size: 24px;
            }
            .category-hero {
                padding-top: 84px;
                padding-bottom: 24px;
            }
            .category-hero h1 {
                font-size: 26px;
            }
            .content-card-grid {
                grid-template-columns: 1fr;
            }
            .tip-card-grid {
                grid-template-columns: 1fr;
            }
            .trust-card-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .download-strip {
                flex-direction: column;
                text-align: center;
                padding: 24px;
            }
            .download-strip .strip-buttons {
                justify-content: center;
                width: 100%;
            }
            .cta-strip {
                padding: 28px 22px;
            }
            .filter-bar {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
        }
        @media (max-width: 520px) {
            body {
                font-size: 15px;
            }
            .btn {
                padding: 10px 18px;
                font-size: 14px;
                width: 100%;
            }
            .section-title {
                font-size: 22px;
            }
            .category-hero h1 {
                font-size: 22px;
            }
            .trust-card-grid {
                grid-template-columns: 1fr;
            }
            .trust-card .trust-number {
                font-size: 24px;
            }
            .content-card .card-title {
                font-size: 16px;
            }
            .cta-strip .cta-title {
                font-size: 20px;
            }
            .footer-bottom {
                font-size: 12px;
            }
        }

/* roulang page: category2 */
:root {
        --primary: #0E7A5F;
        --primary-dark: #0A5F4A;
        --primary-light: #E6F2EE;
        --primary-soft: #F0F7F4;
        --accent: #F5A623;
        --accent-dark: #D88B0A;
        --accent-light: #FFF4DE;
        --bg: #FAF7F2;
        --card-bg: #FFFFFF;
        --text: #1F2A28;
        --text-muted: #66736F;
        --text-light: #8A9692;
        --border: #E4E0D9;
        --border-light: #EDE9E2;
        --danger: #D9534F;
        --footer-bg: #15322B;
        --footer-text: #B8C9C2;
        --footer-heading: #EDF3F0;
        --radius-card: 16px;
        --radius-btn: 10px;
        --radius-tag: 20px;
        --radius-input: 10px;
        --shadow-card: 0 2px 8px rgba(31,42,40,.05);
        --shadow-card-hover: 0 8px 24px rgba(14,122,95,.12);
        --shadow-nav: 0 2px 12px rgba(31,42,40,.08);
        --transition-base: all .22s ease;
        --container-max: 1200px;
        --section-pad-desktop: 72px;
        --section-pad-mobile: 36px;
        --font-heading: "PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,sans-serif;
        --font-body: "PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,sans-serif;
    }
    html {
        scroll-behavior: smooth;
        -webkit-text-size-adjust: 100%;
    }
    body {
        font-family: var(--font-body);
        font-size: 16px;
        line-height: 1.75;
        color: var(--text);
        background-color: var(--bg);
        min-height: 100vh;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
        padding-top: 72px;
    }
    img {
        max-width: 100%;
        height: auto;
        display: block;
        border: 0;
    }
    a {
        color: var(--primary);
        text-decoration: none;
        transition: var(--transition-base);
    }
    a:hover {
        color: var(--primary-dark);
    }
    a:focus,
    button:focus,
    input:focus {
        outline: 2px solid var(--primary);
        outline-offset: 2px;
    }
    button {
        font-family: var(--font-body);
        cursor: pointer;
        border: none;
        background: none;
        transition: var(--transition-base);
    }
    .container {
        max-width: var(--container-max);
        margin: 0 auto;
        padding-left: 20px;
        padding-right: 20px;
        width: 100%;
    }
    .site-header {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 1000;
        background-color: #FFFFFF;
        height: 72px;
        display: flex;
        align-items: center;
        border-bottom: 1px solid var(--border-light);
        transition: box-shadow .25s ease, background-color .25s ease;
    }
    .site-header.scrolled {
        box-shadow: var(--shadow-nav);
    }
    .header-inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 20px;
        width: 100%;
    }
    .logo {
        flex-shrink: 0;
        display: flex;
        align-items: center;
        gap: 10px;
        font-family: var(--font-heading);
        font-weight: 700;
        font-size: 20px;
        color: var(--text);
        letter-spacing: .5px;
        white-space: nowrap;
    }
    .logo:hover {
        color: var(--primary);
    }
    .logo .logo-mark {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 36px;
        height: 36px;
        background: var(--primary);
        color: #FFFFFF;
        border-radius: 10px;
        font-size: 18px;
        font-weight: 700;
        flex-shrink: 0;
    }
    .main-nav {
        display: flex;
        align-items: center;
        gap: 4px;
    }
    .main-nav a {
        display: inline-flex;
        align-items: center;
        padding: 8px 14px;
        font-size: 15px;
        font-weight: 500;
        color: var(--text);
        border-radius: 8px;
        white-space: nowrap;
        position: relative;
        transition: color .18s ease, background-color .18s ease;
    }
    .main-nav a:hover {
        color: var(--primary);
        background-color: var(--primary-soft);
    }
    .main-nav a.active {
        color: var(--primary);
        background-color: var(--primary-soft);
    }
    .main-nav a.active::after {
        content: "";
        position: absolute;
        bottom: 2px;
        left: 14px;
        right: 14px;
        height: 2px;
        background: var(--primary);
        border-radius: 2px;
    }
    .header-cta {
        flex-shrink: 0;
    }
    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        padding: 12px 22px;
        font-size: 15px;
        font-weight: 600;
        border-radius: var(--radius-btn);
        transition: var(--transition-base);
        text-align: center;
        line-height: 1.4;
        border: 1px solid transparent;
        white-space: nowrap;
    }
    .btn:hover {
        text-decoration: none;
    }
    .btn-primary {
        background-color: var(--primary);
        color: #FFFFFF;
        border-color: var(--primary);
    }
    .btn-primary:hover {
        background-color: var(--primary-dark);
        border-color: var(--primary-dark);
        color: #FFFFFF;
        transform: translateY(-1px);
        box-shadow: 0 4px 12px rgba(14,122,95,.25);
    }
    .btn-primary:active {
        transform: translateY(1px);
        box-shadow: none;
    }
    .btn-secondary {
        background-color: transparent;
        color: var(--primary);
        border-color: var(--primary);
    }
    .btn-secondary:hover {
        background-color: var(--primary-light);
        color: var(--primary-dark);
        border-color: var(--primary);
    }
    .btn-accent {
        background-color: var(--accent);
        color: #FFFFFF;
        border-color: var(--accent);
    }
    .btn-accent:hover {
        background-color: var(--accent-dark);
        border-color: var(--accent-dark);
        color: #FFFFFF;
        transform: translateY(-1px);
        box-shadow: 0 4px 12px rgba(245,166,35,.25);
    }
    .btn-outline-light {
        background-color: transparent;
        color: #FFFFFF;
        border-color: rgba(255,255,255,.5);
    }
    .btn-outline-light:hover {
        background-color: rgba(255,255,255,.1);
        color: #FFFFFF;
        border-color: #FFFFFF;
    }
    .hamburger {
        display: none;
        flex-direction: column;
        gap: 5px;
        background: none;
        border: none;
        padding: 8px;
        cursor: pointer;
    }
    .hamburger span {
        display: block;
        width: 24px;
        height: 2px;
        background: var(--text);
        border-radius: 2px;
        transition: var(--transition-base);
    }
    .mobile-menu {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        bottom: 0;
        background: #FFFFFF;
        z-index: 999;
        flex-direction: column;
        padding: 20px;
        overflow-y: auto;
        border-top: 1px solid var(--border-light);
    }
    .mobile-menu.open {
        display: flex;
    }
    .mobile-menu a {
        display: block;
        padding: 14px 16px;
        font-size: 16px;
        font-weight: 500;
        color: var(--text);
        border-radius: 8px;
        border-bottom: 1px solid var(--border-light);
    }
    .mobile-menu a.active {
        color: var(--primary);
        background-color: var(--primary-soft);
    }
    .mobile-menu .btn {
        margin-top: 16px;
        width: 100%;
    }
    /* Category page header */
    .category-page-header {
        background-color: #FFFFFF;
        border-bottom: 1px solid var(--border-light);
        padding: 32px 0 28px;
        margin-top: 0;
    }
    .category-header-inner {
        display: flex;
        align-items: flex-start;
        justify-content: space-between;
        gap: 24px;
        flex-wrap: wrap;
    }
    .category-header-left h1 {
        font-family: var(--font-heading);
        font-size: 32px;
        font-weight: 700;
        color: var(--text);
        margin: 0 0 10px;
        line-height: 1.3;
        letter-spacing: .3px;
    }
    .category-header-left .category-desc {
        font-size: 16px;
        color: var(--text-muted);
        margin: 0;
        max-width: 720px;
        line-height: 1.7;
    }
    .breadcrumb-row {
        display: flex;
        align-items: center;
        gap: 8px;
        font-size: 14px;
        color: var(--text-light);
        flex-shrink: 0;
        white-space: nowrap;
    }
    .breadcrumb-row a {
        color: var(--text-muted);
    }
    .breadcrumb-row a:hover {
        color: var(--primary);
    }
    .breadcrumb-row .sep {
        color: var(--text-light);
    }
    .breadcrumb-row .current {
        color: var(--primary);
        font-weight: 500;
    }
    /* Filter bar */
    .filter-bar {
        background-color: var(--card-bg);
        border-bottom: 1px solid var(--border-light);
        padding: 14px 0;
    }
    .filter-bar-inner {
        display: flex;
        align-items: center;
        gap: 10px;
        flex-wrap: wrap;
    }
    .filter-tag {
        display: inline-flex;
        align-items: center;
        padding: 7px 18px;
        font-size: 14px;
        font-weight: 500;
        border-radius: var(--radius-tag);
        background-color: var(--bg);
        color: var(--text-muted);
        border: 1px solid var(--border-light);
        cursor: pointer;
        transition: var(--transition-base);
        white-space: nowrap;
    }
    .filter-tag:hover {
        border-color: var(--primary);
        color: var(--primary);
        background-color: var(--primary-soft);
    }
    .filter-tag.active {
        background-color: var(--primary);
        color: #FFFFFF;
        border-color: var(--primary);
    }
    /* Category content section */
    .category-content-section {
        padding: 48px 0 64px;
        background-color: var(--bg);
    }
    .category-card-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
        margin-bottom: 32px;
    }
    .category-card {
        background: var(--card-bg);
        border-radius: var(--radius-card);
        border: 1px solid var(--border-light);
        box-shadow: var(--shadow-card);
        overflow: hidden;
        transition: var(--transition-base);
        display: flex;
        flex-direction: column;
    }
    .category-card:hover {
        box-shadow: var(--shadow-card-hover);
        transform: translateY(-3px);
        border-color: var(--primary-light);
    }
    .category-card-img {
        width: 100%;
        aspect-ratio: 16/9;
        object-fit: cover;
        background-color: var(--bg);
    }
    .category-card-body {
        padding: 18px 20px 20px;
        display: flex;
        flex-direction: column;
        flex: 1;
    }
    .category-card-tags {
        display: flex;
        gap: 8px;
        flex-wrap: wrap;
        margin-bottom: 10px;
    }
    .tag {
        display: inline-flex;
        align-items: center;
        padding: 3px 12px;
        font-size: 12px;
        font-weight: 600;
        border-radius: var(--radius-tag);
        background-color: var(--primary-light);
        color: var(--primary);
        white-space: nowrap;
    }
    .tag-accent {
        background-color: var(--accent-light);
        color: var(--accent-dark);
    }
    .category-card-title {
        font-family: var(--font-heading);
        font-size: 18px;
        font-weight: 700;
        color: var(--text);
        margin: 0 0 8px;
        line-height: 1.4;
        letter-spacing: .2px;
    }
    .category-card-title a {
        color: var(--text);
    }
    .category-card-title a:hover {
        color: var(--primary);
    }
    .category-card-summary {
        font-size: 14px;
        color: var(--text-muted);
        line-height: 1.65;
        margin: 0 0 14px;
        flex: 1;
    }
    .category-card-meta {
        display: flex;
        align-items: center;
        justify-content: space-between;
        font-size: 13px;
        color: var(--text-light);
        border-top: 1px solid var(--border-light);
        padding-top: 12px;
    }
    .category-card-meta .date {
        display: flex;
        align-items: center;
        gap: 4px;
    }
    .category-card-meta a {
        color: var(--primary);
        font-weight: 500;
        font-size: 13px;
    }
    .category-card-meta a:hover {
        color: var(--primary-dark);
    }
    .load-more-row {
        text-align: center;
    }
    .btn-outline {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        padding: 11px 30px;
        font-size: 15px;
        font-weight: 600;
        border-radius: var(--radius-btn);
        border: 1px solid var(--border);
        color: var(--text);
        background-color: #FFFFFF;
        transition: var(--transition-base);
        white-space: nowrap;
    }
    .btn-outline:hover {
        border-color: var(--primary);
        color: var(--primary);
        background-color: var(--primary-soft);
    }
    /* Support section 1 - download banner */
    .download-banner-section {
        padding: 48px 0;
        background-color: var(--primary-soft);
    }
    .download-banner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 24px;
        flex-wrap: wrap;
        background: #FFFFFF;
        border-radius: var(--radius-card);
        border: 1px solid var(--primary-light);
        padding: 32px 36px;
        box-shadow: var(--shadow-card);
    }
    .download-banner-left h3 {
        font-family: var(--font-heading);
        font-size: 22px;
        font-weight: 700;
        color: var(--text);
        margin: 0 0 6px;
    }
    .download-banner-left p {
        font-size: 15px;
        color: var(--text-muted);
        margin: 0;
    }
    .download-banner-actions {
        display: flex;
        gap: 12px;
        flex-wrap: wrap;
        flex-shrink: 0;
    }
    /* Support section 2 - tips */
    .tips-section {
        padding: 56px 0;
        background-color: var(--bg);
    }
    .section-title {
        font-family: var(--font-heading);
        font-size: 28px;
        font-weight: 700;
        color: var(--text);
        margin: 0 0 8px;
        line-height: 1.35;
        letter-spacing: .3px;
    }
    .section-subtitle {
        font-size: 16px;
        color: var(--text-muted);
        margin: 0 0 32px;
        line-height: 1.7;
    }
    .tips-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
    }
    .tip-card {
        background: var(--card-bg);
        border-radius: var(--radius-card);
        border: 1px solid var(--border-light);
        padding: 24px 22px;
        box-shadow: var(--shadow-card);
        transition: var(--transition-base);
    }
    .tip-card:hover {
        box-shadow: var(--shadow-card-hover);
        border-color: var(--primary-light);
    }
    .tip-icon {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 40px;
        height: 40px;
        background: var(--primary-light);
        color: var(--primary);
        border-radius: 10px;
        font-size: 18px;
        font-weight: 700;
        margin-bottom: 14px;
    }
    .tip-card h4 {
        font-family: var(--font-heading);
        font-size: 17px;
        font-weight: 700;
        color: var(--text);
        margin: 0 0 8px;
    }
    .tip-card p {
        font-size: 14px;
        color: var(--text-muted);
        margin: 0;
        line-height: 1.65;
    }
    /* FAQ section */
    .faq-section {
        padding: 56px 0 64px;
        background-color: #FFFFFF;
        border-top: 1px solid var(--border-light);
    }
    .faq-list {
        max-width: 820px;
        margin: 0 auto;
    }
    .faq-item {
        border: 1px solid var(--border-light);
        border-radius: 12px;
        margin-bottom: 12px;
        background: var(--card-bg);
        overflow: hidden;
        transition: var(--transition-base);
    }
    .faq-item:hover {
        border-color: var(--primary-light);
    }
    .faq-question {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 16px;
        padding: 16px 20px;
        cursor: pointer;
        font-size: 16px;
        font-weight: 600;
        color: var(--text);
        background: none;
        border: none;
        width: 100%;
        text-align: left;
        transition: var(--transition-base);
    }
    .faq-question:hover {
        color: var(--primary);
    }
    .faq-icon {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 24px;
        height: 24px;
        border-radius: 50%;
        background: var(--primary-light);
        color: var(--primary);
        font-size: 16px;
        font-weight: 500;
        flex-shrink: 0;
        transition: transform .2s ease;
    }
    .faq-item.open .faq-icon {
        transform: rotate(45deg);
        background: var(--primary);
        color: #FFFFFF;
    }
    .faq-answer {
        max-height: 0;
        overflow: hidden;
        transition: max-height .3s ease;
        padding: 0 20px;
    }
    .faq-item.open .faq-answer {
        max-height: 240px;
        padding: 0 20px 18px;
    }
    .faq-answer p {
        font-size: 15px;
        color: var(--text-muted);
        margin: 0;
        line-height: 1.7;
    }
    /* Trust / data section */
    .trust-data-section {
        padding: 48px 0;
        background-color: var(--bg);
    }
    .trust-data-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 20px;
    }
    .trust-data-item {
        text-align: center;
        padding: 24px 16px;
        background: var(--card-bg);
        border-radius: var(--radius-card);
        border: 1px solid var(--border-light);
        box-shadow: var(--shadow-card);
    }
    .trust-data-item .number {
        font-family: var(--font-heading);
        font-size: 34px;
        font-weight: 700;
        color: var(--primary);
        line-height: 1.2;
    }
    .trust-data-item .label {
        font-size: 14px;
        color: var(--text-muted);
        margin-top: 6px;
    }
    /* CTA section */
    .cta-section {
        padding: 48px 0;
        background-color: var(--primary);
    }
    .cta-inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 20px;
        flex-wrap: wrap;
    }
    .cta-inner h3 {
        font-family: var(--font-heading);
        font-size: 24px;
        font-weight: 700;
        color: #FFFFFF;
        margin: 0;
        line-height: 1.4;
    }
    .cta-inner p {
        font-size: 15px;
        color: rgba(255,255,255,.8);
        margin: 4px 0 0;
    }
    /* Footer */
    .site-footer {
        background-color: var(--footer-bg);
        color: var(--footer-text);
        padding: 56px 0 28px;
    }
    .footer-grid {
        display: grid;
        grid-template-columns: 2fr 1fr 1fr 1fr;
        gap: 32px;
        margin-bottom: 40px;
    }
    .footer-brand .logo {
        color: #FFFFFF;
        margin-bottom: 14px;
        font-size: 20px;
    }
    .footer-brand .logo:hover {
        color: #FFFFFF;
    }
    .footer-brand .logo .logo-mark {
        background: var(--primary);
    }
    .footer-brand p {
        font-size: 14px;
        line-height: 1.65;
        color: var(--footer-text);
        margin: 0;
        max-width: 300px;
    }
    .footer-col h4 {
        font-family: var(--font-heading);
        font-size: 15px;
        font-weight: 700;
        color: var(--footer-heading);
        margin: 0 0 14px;
        letter-spacing: .5px;
    }
    .footer-col ul {
        list-style: none;
        padding: 0;
        margin: 0;
    }
    .footer-col ul li {
        margin-bottom: 8px;
    }
    .footer-col ul li a {
        color: var(--footer-text);
        font-size: 14px;
        transition: var(--transition-base);
    }
    .footer-col ul li a:hover {
        color: #FFFFFF;
        padding-left: 4px;
    }
    .footer-qr {
        width: 100px;
        height: 100px;
        background: rgba(255,255,255,.08);
        border-radius: 8px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 12px;
        color: var(--footer-text);
        text-align: center;
        margin-bottom: 8px;
    }
    .footer-bottom {
        border-top: 1px solid rgba(255,255,255,.12);
        padding-top: 20px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 16px;
        flex-wrap: wrap;
        font-size: 13px;
        color: var(--footer-text);
    }
    .footer-bottom p {
        margin: 0;
    }
    .footer-bottom .domain {
        color: #FFFFFF;
        font-weight: 500;
    }
    /* Responsive */
    @media (max-width: 1024px) {
        .category-card-grid {
            grid-template-columns: repeat(2, 1fr);
        }
        .tips-grid {
            grid-template-columns: repeat(2, 1fr);
        }
        .trust-data-grid {
            grid-template-columns: repeat(2, 1fr);
        }
        .footer-grid {
            grid-template-columns: 1fr 1fr;
        }
    }
    @media (max-width: 768px) {
        body {
            padding-top: 64px;
        }
        .site-header {
            height: 64px;
        }
        .header-inner {
            gap: 12px;
        }
        .logo {
            font-size: 17px;
        }
        .logo .logo-mark {
            width: 32px;
            height: 32px;
            font-size: 16px;
            border-radius: 8px;
        }
        .main-nav {
            display: none;
        }
        .hamburger {
            display: flex;
        }
        .header-cta .btn {
            padding: 9px 16px;
            font-size: 14px;
        }
        .mobile-menu {
            top: 64px;
        }
        .category-header-inner {
            flex-direction: column;
            gap: 12px;
        }
        .category-header-left h1 {
            font-size: 26px;
        }
        .category-card-grid {
            grid-template-columns: 1fr;
        }
        .tips-grid {
            grid-template-columns: 1fr;
        }
        .trust-data-grid {
            grid-template-columns: 1fr 1fr;
        }
        .section-title {
            font-size: 24px;
        }
        .download-banner {
            flex-direction: column;
            text-align: center;
            padding: 24px;
        }
        .download-banner-actions {
            justify-content: center;
        }
        .cta-inner {
            flex-direction: column;
            text-align: center;
        }
        .footer-grid {
            grid-template-columns: 1fr;
            gap: 24px;
        }
        .footer-bottom {
            flex-direction: column;
            text-align: center;
        }
    }
    @media (max-width: 520px) {
        .category-header-left h1 {
            font-size: 22px;
        }
        .category-desc {
            font-size: 14px;
        }
        .filter-tag {
            font-size: 13px;
            padding: 6px 14px;
        }
        .category-card-title {
            font-size: 16px;
        }
        .btn {
            padding: 10px 18px;
            font-size: 14px;
        }
        .section-title {
            font-size: 22px;
        }
        .trust-data-item .number {
            font-size: 26px;
        }
    }

/* roulang page: category3 */
:root {
        --primary: #0E7A5F;
        --primary-dark: #0A5F4A;
        --primary-light: #E6F2EE;
        --primary-soft: #F0F7F4;
        --accent: #F5A623;
        --accent-dark: #D88B0A;
        --accent-light: #FFF4DE;
        --bg: #FAF7F2;
        --card-bg: #FFFFFF;
        --text: #1F2A28;
        --text-muted: #66736F;
        --text-light: #8A9692;
        --border: #E4E0D9;
        --border-light: #EDE9E2;
        --danger: #D9534F;
        --footer-bg: #15322B;
        --footer-text: #B8C9C2;
        --footer-heading: #EDF3F0;
        --radius-card: 16px;
        --radius-btn: 10px;
        --radius-tag: 20px;
        --radius-input: 10px;
        --shadow-card: 0 2px 8px rgba(31,42,40,.05);
        --shadow-card-hover: 0 8px 24px rgba(14,122,95,.12);
        --shadow-nav: 0 2px 12px rgba(31,42,40,.08);
        --transition-base: all .22s ease;
        --container-max: 1200px;
        --section-pad-desktop: 72px;
        --section-pad-mobile: 36px;
        --font-heading: "PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,sans-serif;
        --font-body: "PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,sans-serif;
    }
    html {
        scroll-behavior: smooth;
        -webkit-text-size-adjust: 100%;
    }
    body {
        font-family: var(--font-body);
        font-size: 16px;
        line-height: 1.75;
        color: var(--text);
        background-color: var(--bg);
        min-height: 100vh;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
        padding-top: 72px;
    }
    img {
        max-width: 100%;
        height: auto;
        display: block;
        border: 0;
    }
    a {
        color: var(--primary);
        text-decoration: none;
        transition: var(--transition-base);
    }
    a:hover {
        color: var(--primary-dark);
    }
    a:focus,
    button:focus,
    input:focus,
    select:focus,
    textarea:focus {
        outline: 2px solid var(--primary);
        outline-offset: 2px;
    }
    button {
        font-family: var(--font-body);
        cursor: pointer;
        border: none;
        background: none;
        transition: var(--transition-base);
    }
    .container {
        max-width: var(--container-max);
        margin: 0 auto;
        padding-left: 20px;
        padding-right: 20px;
        width: 100%;
    }
    /* Header / Navigation */
    .site-header {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 1000;
        background-color: #FFFFFF;
        height: 72px;
        display: flex;
        align-items: center;
        border-bottom: 1px solid var(--border-light);
        transition: box-shadow .25s ease, background-color .25s ease;
    }
    .site-header.scrolled {
        box-shadow: var(--shadow-nav);
    }
    .header-inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 20px;
        width: 100%;
    }
    .logo {
        flex-shrink: 0;
        display: flex;
        align-items: center;
        gap: 10px;
        font-family: var(--font-heading);
        font-weight: 700;
        font-size: 20px;
        color: var(--text);
        letter-spacing: .5px;
        white-space: nowrap;
    }
    .logo:hover {
        color: var(--primary);
    }
    .logo .logo-mark {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 36px;
        height: 36px;
        background: var(--primary);
        color: #FFFFFF;
        border-radius: 10px;
        font-size: 18px;
        font-weight: 700;
        flex-shrink: 0;
    }
    .main-nav {
        display: flex;
        align-items: center;
        gap: 4px;
    }
    .main-nav a {
        display: inline-flex;
        align-items: center;
        padding: 8px 14px;
        font-size: 15px;
        font-weight: 500;
        color: var(--text);
        border-radius: 8px;
        white-space: nowrap;
        position: relative;
        transition: color .18s ease, background-color .18s ease;
    }
    .main-nav a:hover {
        color: var(--primary);
        background-color: var(--primary-soft);
    }
    .main-nav a.active {
        color: var(--primary);
        background-color: var(--primary-soft);
    }
    .main-nav a.active::after {
        content: "";
        position: absolute;
        bottom: 2px;
        left: 14px;
        right: 14px;
        height: 2px;
        background: var(--primary);
        border-radius: 2px;
    }
    .header-cta {
        flex-shrink: 0;
    }
    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        padding: 12px 22px;
        font-size: 15px;
        font-weight: 600;
        border-radius: var(--radius-btn);
        transition: var(--transition-base);
        text-align: center;
        line-height: 1.4;
        border: 1px solid transparent;
        white-space: nowrap;
    }
    .btn:hover {
        text-decoration: none;
    }
    .btn-primary {
        background-color: var(--primary);
        color: #FFFFFF;
        border-color: var(--primary);
    }
    .btn-primary:hover {
        background-color: var(--primary-dark);
        border-color: var(--primary-dark);
        color: #FFFFFF;
        transform: translateY(-1px);
        box-shadow: 0 4px 12px rgba(14,122,95,.25);
    }
    .btn-primary:active {
        transform: translateY(1px);
        box-shadow: none;
    }
    .btn-secondary {
        background-color: transparent;
        color: var(--primary);
        border-color: var(--primary);
    }
    .btn-secondary:hover {
        background-color: var(--primary-light);
        color: var(--primary-dark);
        transform: translateY(-1px);
    }
    .btn-accent {
        background-color: var(--accent);
        color: #FFFFFF;
        border-color: var(--accent);
    }
    .btn-accent:hover {
        background-color: var(--accent-dark);
        border-color: var(--accent-dark);
        color: #FFFFFF;
        transform: translateY(-1px);
        box-shadow: 0 4px 12px rgba(245,166,35,.3);
    }
    .btn-white {
        background-color: #FFFFFF;
        color: var(--primary);
        border-color: #FFFFFF;
    }
    .btn-white:hover {
        background-color: var(--primary-soft);
        color: var(--primary-dark);
        border-color: var(--primary-soft);
        transform: translateY(-1px);
    }
    /* Mobile Hamburger */
    .nav-toggle {
        display: none;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        width: 44px;
        height: 44px;
        border-radius: 10px;
        background: var(--primary-soft);
        padding: 0;
        gap: 5px;
    }
    .nav-toggle span {
        display: block;
        width: 22px;
        height: 2px;
        background: var(--primary);
        border-radius: 2px;
        transition: transform .25s ease, opacity .25s ease;
    }
    .nav-toggle.open span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }
    .nav-toggle.open span:nth-child(2) {
        opacity: 0;
    }
    .nav-toggle.open span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }
    /* Category3 Specific Styles */
    .page-head {
        background: linear-gradient(180deg, #F4F1EA 0%, #FAF7F2 100%);
        padding: 40px 0 32px;
        border-bottom: 1px solid var(--border-light);
    }
    .breadcrumb-text {
        font-size: 14px;
        color: var(--text-muted);
        margin-bottom: 12px;
    }
    .breadcrumb-text .sep {
        margin: 0 8px;
        color: var(--text-light);
    }
    .page-head h1 {
        font-family: var(--font-heading);
        font-size: 32px;
        font-weight: 700;
        color: var(--text);
        margin: 0 0 12px;
        letter-spacing: .3px;
        line-height: 1.35;
    }
    .page-head .page-lead {
        font-size: 16px;
        color: var(--text-muted);
        max-width: 760px;
        margin: 0;
        line-height: 1.75;
    }
    .filter-bar {
        background: #FFFFFF;
        padding: 14px 0;
        border-bottom: 1px solid var(--border-light);
    }
    .filter-tags {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
    }
    .filter-tag {
        display: inline-flex;
        align-items: center;
        padding: 7px 18px;
        font-size: 14px;
        font-weight: 500;
        color: var(--text-muted);
        background: var(--bg);
        border-radius: var(--radius-tag);
        cursor: default;
        transition: var(--transition-base);
        user-select: none;
    }
    .filter-tag.active {
        background: var(--primary);
        color: #FFFFFF;
    }
    .filter-tag:not(.active):hover {
        background: var(--primary-light);
        color: var(--primary);
    }
    .topic-list-section {
        background: var(--bg);
        padding: 48px 0 40px;
    }
    .topic-card {
        background: var(--card-bg);
        border: 1px solid var(--border-light);
        border-radius: var(--radius-card);
        overflow: hidden;
        box-shadow: var(--shadow-card);
        transition: var(--transition-base);
        height: 100%;
        display: flex;
        flex-direction: column;
    }
    .topic-card:hover {
        transform: translateY(-3px);
        box-shadow: var(--shadow-card-hover);
        border-color: var(--primary-light);
    }
    .topic-card-img {
        aspect-ratio: 16 / 9;
        background: #EFEAE3;
        overflow: hidden;
        position: relative;
    }
    .topic-card-img img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: transform .4s ease;
    }
    .topic-card:hover .topic-card-img img {
        transform: scale(1.04);
    }
    .topic-card-body {
        padding: 18px 20px 20px;
        display: flex;
        flex-direction: column;
        flex: 1;
    }
    .topic-card-tags {
        display: flex;
        flex-wrap: wrap;
        gap: 6px;
        margin-bottom: 10px;
    }
    .topic-card-tag {
        display: inline-block;
        padding: 3px 10px;
        font-size: 12px;
        font-weight: 500;
        color: var(--primary);
        background: var(--primary-light);
        border-radius: var(--radius-tag);
        line-height: 1.5;
    }
    .topic-card-tag.accent-tag {
        color: var(--accent-dark);
        background: var(--accent-light);
    }
    .topic-card-title {
        font-family: var(--font-heading);
        font-size: 18px;
        font-weight: 600;
        color: var(--text);
        margin: 0 0 8px;
        line-height: 1.45;
    }
    .topic-card-desc {
        font-size: 14px;
        color: var(--text-muted);
        line-height: 1.7;
        flex: 1;
        margin-bottom: 14px;
    }
    .topic-card-meta {
        display: flex;
        align-items: center;
        justify-content: space-between;
        font-size: 13px;
        color: var(--text-light);
        padding-top: 12px;
        border-top: 1px solid var(--border-light);
    }
    .topic-card-link {
        font-size: 14px;
        font-weight: 600;
        color: var(--primary);
        display: inline-flex;
        align-items: center;
        gap: 4px;
    }
    .topic-card-link:hover {
        color: var(--primary-dark);
    }
    .view-more-wrap {
        text-align: center;
        padding: 8px 0 0;
    }
    .resource-banner {
        background: var(--primary);
        background-image: linear-gradient(135deg, #0E7A5F 0%, #0A5F4A 100%);
        border-radius: var(--radius-card);
        padding: 32px 36px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 24px;
        flex-wrap: wrap;
    }
    .resource-banner-left h2 {
        font-family: var(--font-heading);
        font-size: 22px;
        font-weight: 700;
        color: #FFFFFF;
        margin: 0 0 6px;
    }
    .resource-banner-left p {
        font-size: 15px;
        color: rgba(255,255,255,.85);
        margin: 0;
    }
    .resource-banner-actions {
        display: flex;
        flex-wrap: wrap;
        gap: 12px;
    }
    .resource-banner-actions .btn {
        padding: 11px 20px;
        font-size: 14px;
    }
    .tip-card-section {
        background: var(--bg);
    }
    .tip-card {
        background: var(--card-bg);
        border: 1px solid var(--border-light);
        border-radius: var(--radius-card);
        padding: 24px;
        height: 100%;
        transition: var(--transition-base);
        box-shadow: var(--shadow-card);
    }
    .tip-card:hover {
        box-shadow: var(--shadow-card-hover);
        transform: translateY(-2px);
    }
    .tip-card .tip-icon {
        width: 44px;
        height: 44px;
        background: var(--primary-soft);
        border-radius: 12px;
        display: flex;
        align-items: center;
        justify-content: center;
        margin-bottom: 14px;
        font-size: 20px;
    }
    .tip-card h3 {
        font-family: var(--font-heading);
        font-size: 17px;
        font-weight: 600;
        color: var(--text);
        margin: 0 0 8px;
    }
    .tip-card p {
        font-size: 14px;
        color: var(--text-muted);
        line-height: 1.7;
        margin: 0;
    }
    .faq-section {
        background: #FFFFFF;
        border-top: 1px solid var(--border-light);
    }
    .faq-list {
        max-width: 820px;
        margin: 0 auto;
    }
    .faq-item {
        border: 1px solid var(--border-light);
        border-radius: 12px;
        margin-bottom: 12px;
        overflow: hidden;
        background: #FFFFFF;
        transition: var(--transition-base);
    }
    .faq-item[open] {
        border-color: var(--primary-light);
        box-shadow: 0 4px 16px rgba(14,122,95,.08);
    }
    .faq-item summary {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 16px 20px;
        cursor: pointer;
        font-size: 16px;
        font-weight: 600;
        color: var(--text);
        list-style: none;
        transition: color .2s ease;
        gap: 16px;
    }
    .faq-item summary::-webkit-details-marker {
        display: none;
    }
    .faq-item summary:hover {
        color: var(--primary);
    }
    .faq-item summary .faq-icon {
        flex-shrink: 0;
        width: 24px;
        height: 24px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        background: var(--primary-soft);
        border-radius: 50%;
        font-size: 16px;
        color: var(--primary);
        transition: transform .25s ease;
    }
    .faq-item[open] summary .faq-icon {
        transform: rotate(45deg);
    }
    .faq-item .faq-answer {
        padding: 0 20px 18px;
        font-size: 15px;
        color: var(--text-muted);
        line-height: 1.75;
    }
    .trust-strip {
        background: var(--bg);
        border-top: 1px solid var(--border-light);
    }
    .trust-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 20px;
    }
    .trust-item {
        text-align: center;
        padding: 20px 16px;
        background: var(--card-bg);
        border-radius: var(--radius-card);
        border: 1px solid var(--border-light);
    }
    .trust-item .trust-num {
        font-size: 28px;
        font-weight: 700;
        color: var(--primary);
        font-family: var(--font-heading);
        display: block;
        margin-bottom: 4px;
    }
    .trust-item .trust-label {
        font-size: 14px;
        color: var(--text-muted);
    }
    .cta-strip {
        background: var(--footer-bg);
        padding: 36px 0;
        text-align: center;
    }
    .cta-strip h2 {
        font-family: var(--font-heading);
        font-size: 24px;
        font-weight: 700;
        color: #FFFFFF;
        margin: 0 0 8px;
    }
    .cta-strip p {
        font-size: 15px;
        color: var(--footer-text);
        margin: 0 0 20px;
    }
    .cta-strip .btn {
        font-size: 16px;
        padding: 14px 30px;
    }
    /* Footer */
    .site-footer {
        background: var(--footer-bg);
        padding: 56px 0 24px;
        color: var(--footer-text);
    }
    .footer-grid {
        display: grid;
        grid-template-columns: 1.4fr 1fr 1fr 1fr;
        gap: 36px;
        margin-bottom: 40px;
    }
    .footer-brand .logo {
        color: #FFFFFF;
        font-size: 20px;
        margin-bottom: 14px;
        display: inline-flex;
    }
    .footer-brand .logo .logo-mark {
        background: var(--primary);
    }
    .footer-brand p {
        font-size: 14px;
        line-height: 1.8;
        color: var(--footer-text);
        margin: 0;
        max-width: 300px;
    }
    .footer-col h4 {
        font-family: var(--font-heading);
        font-size: 15px;
        font-weight: 600;
        color: var(--footer-heading);
        margin: 0 0 14px;
    }
    .footer-col ul {
        list-style: none;
        padding: 0;
        margin: 0;
    }
    .footer-col ul li {
        margin-bottom: 8px;
    }
    .footer-col ul li a {
        color: var(--footer-text);
        font-size: 14px;
        transition: color .2s ease;
    }
    .footer-col ul li a:hover {
        color: #FFFFFF;
    }
    .footer-qr {
        width: 100px;
        height: 100px;
        background: rgba(255,255,255,.08);
        border: 1px solid rgba(255,255,255,.15);
        border-radius: 10px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 12px;
        color: var(--footer-text);
        margin-bottom: 10px;
    }
    .footer-bottom {
        border-top: 1px solid rgba(255,255,255,.1);
        padding-top: 20px;
        text-align: center;
    }
    .footer-bottom p {
        font-size: 13px;
        color: var(--footer-text);
        margin: 0 0 4px;
    }
    .footer-bottom .domain {
        color: var(--accent);
    }
    /* Section headings */
    .section-head {
        margin-bottom: 32px;
    }
    .section-head h2 {
        font-family: var(--font-heading);
        font-size: 26px;
        font-weight: 700;
        color: var(--text);
        margin: 0 0 6px;
        letter-spacing: .3px;
    }
    .section-head p {
        font-size: 15px;
        color: var(--text-muted);
        margin: 0;
    }
    /* Responsive */
    @media (max-width: 1024px) {
        .main-nav a {
            padding: 8px 10px;
            font-size: 14px;
        }
        .trust-grid {
            grid-template-columns: repeat(2, 1fr);
        }
        .footer-grid {
            grid-template-columns: 1fr 1fr;
            gap: 28px;
        }
        .resource-banner {
            flex-direction: column;
            text-align: center;
            padding: 28px 24px;
        }
        .resource-banner-actions {
            justify-content: center;
        }
    }
    @media (max-width: 768px) {
        body {
            padding-top: 64px;
        }
        .site-header {
            height: 64px;
        }
        .main-nav {
            display: none;
            position: fixed;
            top: 64px;
            left: 0;
            right: 0;
            background: #FFFFFF;
            flex-direction: column;
            align-items: stretch;
            padding: 12px 16px 80px;
            gap: 2px;
            box-shadow: 0 12px 24px rgba(31,42,40,.12);
            z-index: 999;
            max-height: calc(100vh - 64px);
            overflow-y: auto;
        }
        .main-nav.open {
            display: flex;
        }
        .main-nav a {
            padding: 12px 16px;
            font-size: 15px;
            border-radius: 8px;
        }
        .main-nav a.active::after {
            display: none;
        }
        .nav-toggle {
            display: flex;
        }
        .header-cta {
            margin-left: auto;
        }
        .header-cta .btn {
            padding: 9px 14px;
            font-size: 13px;
        }
        .page-head {
            padding: 28px 0 24px;
        }
        .page-head h1 {
            font-size: 26px;
        }
        .page-head .page-lead {
            font-size: 15px;
        }
        .topic-list-section {
            padding: 32px 0 28px;
        }
        .section-head h2 {
            font-size: 22px;
        }
        .trust-grid {
            grid-template-columns: 1fr 1fr;
            gap: 12px;
        }
        .trust-item .trust-num {
            font-size: 22px;
        }
        .cta-strip h2 {
            font-size: 20px;
        }
        .footer-grid {
            grid-template-columns: 1fr;
            gap: 24px;
        }
        .footer-brand p {
            max-width: 100%;
        }
    }
    @media (max-width: 480px) {
        .container {
            padding-left: 14px;
            padding-right: 14px;
        }
        .page-head h1 {
            font-size: 22px;
        }
        .topic-card-title {
            font-size: 16px;
        }
        .resource-banner {
            padding: 22px 18px;
        }
        .resource-banner-left h2 {
            font-size: 18px;
        }
        .tip-card {
            padding: 18px;
        }
        .faq-item summary {
            font-size: 14px;
            padding: 13px 16px;
        }
        .faq-item .faq-answer {
            font-size: 14px;
            padding: 0 16px 14px;
        }
        .cta-strip h2 {
            font-size: 18px;
        }
        .btn {
            font-size: 13px;
            padding: 10px 16px;
        }
        .btn-primary,
        .btn-secondary,
        .btn-accent {
            width: 100%;
            justify-content: center;
        }
        .trust-grid {
            grid-template-columns: 1fr 1fr;
        }
        .filter-tag {
            font-size: 13px;
            padding: 6px 13px;
        }
    }