/* roulang page: index */
:root {
            --primary: #0d9488;
            --primary-dark: #0f766e;
            --accent: #f97316;
            --bg: #f8fafc;
            --text: #1e293b;
            --text-light: #64748b;
            --border: #f1f5f9;
            --radius-lg: 24px;
            --radius-md: 12px;
            --shadow-card: 0 4px 24px rgba(13, 148, 136, 0.06);
            --shadow-hover: 0 20px 40px rgba(13, 148, 136, 0.12);
        }
        * {
            box-sizing: border-box;
        }
        html {
            scroll-padding-top: 130px;
            scroll-behavior: smooth;
        }
        body {
            font-family: 'ui-sans-serif', -apple-system, 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            background-color: #f8fafc;
            color: #1e293b;
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            margin: 0;
        }
        img {
            max-width: 100%;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
        }
        button {
            font-family: inherit;
            cursor: pointer;
        }
        .brand-gradient {
            background-image: linear-gradient(115deg, #14b8a6 0%, #06b6d4 50%, #3b82f6 100%);
        }
        .accent-gradient {
            background-image: linear-gradient(115deg, #f97316 0%, #f59e0b 100%);
        }
        .text-gradient {
            background-image: linear-gradient(115deg, #14b8a6 0%, #06b6d4 50%, #3b82f6 100%);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .scrollbar-hide::-webkit-scrollbar {
            display: none;
        }
        .scrollbar-hide {
            -ms-overflow-style: none;
            scrollbar-width: none;
        }
        .card-hover {
            transition: all 0.3s ease;
        }
        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 40px rgba(13, 148, 136, 0.12);
        }
        .btn-primary {
            transition: all 0.3s ease;
        }
        .btn-primary:hover {
            filter: brightness(1.05) saturate(1.1);
        }
        .btn-primary:active {
            transform: scale(0.98);
            opacity: 0.9;
        }
        .btn-outline {
            transition: all 0.3s ease;
        }
        .btn-outline:hover {
            background-color: #f0fdfa;
            border-color: #0d9488;
            color: #0d9488;
        }
        .btn-outline:active {
            transform: scale(0.98);
        }
        .line-clamp-2 {
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .line-clamp-1 {
            display: -webkit-box;
            -webkit-line-clamp: 1;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }
        .faq-item.active .faq-answer {
            max-height: 400px;
        }
        .faq-item.active .faq-icon {
            transform: rotate(45deg);
        }
        .faq-icon {
            transition: transform 0.3s ease;
        }
        .deco-ring {
            position: absolute;
            border-radius: 50%;
            border: 2px solid rgba(13, 148, 136, 0.15);
            pointer-events: none;
        }
        @media (max-width: 768px) {
            .hero-img-wrap {
                margin-top: 2rem;
            }
        }
        :focus-visible {
            outline: none;
            box-shadow: 0 0 0 4px rgba(13, 148, 136, 0.2);
            border-radius: 8px;
        }

/* roulang page: category1 */
:root {
    --primary-600: #0d9488;
    --accent-500: #f97316;
  }
  * { box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body {
    font-family: ui-sans-serif, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
    background-color: #f8fafc;
    color: #1e293b;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
  }
  .brand-gradient {
    background: linear-gradient(115deg, #14b8a6, #06b6d4, #3b82f6);
  }
  .brand-gradient-line {
    background: linear-gradient(115deg, #14b8a6, #06b6d4, #3b82f6);
  }
  .text-primary-gradient {
    background: linear-gradient(115deg, #14b8a6, #06b6d4, #3b82f6);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
  .accent-gradient {
    background: linear-gradient(115deg, #f97316, #f59e0b);
  }
  .scrollbar-hide::-webkit-scrollbar { display: none; }
  .scrollbar-hide { -ms-overflow-style: none; scrollbar-width: none; }
  section { scroll-margin-top: 120px; }

/* roulang page: article */
:root {
            --primary: #0d9488;
            --primary-dark: #0f766e;
            --accent: #f97316;
            --bg: #f8fafc;
            --text: #1e293b;
            --text-muted: #64748b;
            --border: #f1f5f9;
        }

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

        html {
            scroll-padding-top: 120px;
        }

        body {
            font-family: ui-sans-serif, -apple-system, 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

        img,
        svg {
            max-width: 100%;
            display: block;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.2s ease;
        }

        .brand-gradient {
            background: linear-gradient(115deg, #14b8a6, #06b6d4, #3b82f6);
        }

        .accent-gradient {
            background: linear-gradient(115deg, #f97316, #f59e0b);
        }

        .text-gradient {
            background: linear-gradient(115deg, #14b8a6, #06b6d4, #3b82f6);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }

        .scrollbar-hide::-webkit-scrollbar {
            display: none;
        }

        .scrollbar-hide {
            -ms-overflow-style: none;
            scrollbar-width: none;
        }

        .article-content {
            font-size: 16px;
            line-height: 1.8;
            color: #334155;
        }

        .article-content p {
            margin-bottom: 24px;
            letter-spacing: 0.01em;
        }

        .article-content h2 {
            font-size: 24px;
            font-weight: 700;
            color: #0f172a;
            margin: 36px 0 16px;
            padding-top: 8px;
            letter-spacing: -0.01em;
        }

        .article-content h3 {
            font-size: 18px;
            font-weight: 700;
            color: #0f172a;
            margin: 28px 0 12px;
        }

        .article-content h4 {
            font-size: 16px;
            font-weight: 700;
            color: #0f172a;
            margin: 24px 0 10px;
        }

        .article-content img {
            border-radius: 16px;
            margin: 28px auto;
            box-shadow: 0 8px 30px rgba(13, 148, 136, 0.1);
        }

        .article-content figure {
            margin: 28px 0;
        }

        .article-content figcaption {
            text-align: center;
            font-size: 14px;
            color: #94a3b8;
            margin-top: 10px;
        }

        .article-content blockquote {
            border-left: 4px solid var(--primary);
            background: rgba(240, 253, 250, 0.6);
            padding: 18px 22px;
            color: #475569;
            border-radius: 0 16px 16px 0;
            margin: 28px 0;
            font-style: normal;
        }

        .article-content blockquote p {
            margin-bottom: 0;
        }

        .article-content ul {
            list-style: none;
            padding-left: 0;
            margin: 24px 0;
        }

        .article-content ul li {
            position: relative;
            padding-left: 24px;
            margin-bottom: 10px;
        }

        .article-content ul li::before {
            content: '';
            position: absolute;
            left: 4px;
            top: 13px;
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--primary);
        }

        .article-content ol {
            padding-left: 22px;
            margin: 24px 0;
        }

        .article-content ol li {
            margin-bottom: 10px;
        }

        .article-content ol li::marker {
            color: var(--primary);
            font-weight: 700;
        }

        .article-content a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 3px;
        }

        .article-content a:hover {
            color: var(--primary-dark);
            text-decoration-thickness: 2px;
        }

        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 24px 0;
            font-size: 15px;
        }

        .article-content table th {
            background: #f0fdfa;
            font-weight: 700;
            color: #0f766e;
            text-align: left;
            padding: 12px 16px;
            border: 1px solid #e2e8f0;
        }

        .article-content table td {
            padding: 10px 16px;
            border: 1px solid #e2e8f0;
        }

        .article-content code {
            background: #f1f5f9;
            border-radius: 6px;
            padding: 2px 6px;
            font-size: 14px;
            color: #0f766e;
        }

        .article-content pre {
            background: #0f172a;
            color: #e2e8f0;
            border-radius: 12px;
            padding: 20px;
            overflow-x: auto;
            margin: 24px 0;
        }

        .article-content pre code {
            background: transparent;
            color: inherit;
            padding: 0;
        }

        .article-content hr {
            border: none;
            border-top: 1px solid #e2e8f0;
            margin: 36px 0;
        }

        .line-clamp-2 {
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .line-clamp-1 {
            display: -webkit-box;
            -webkit-line-clamp: 1;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        @media (max-width: 640px) {
            .article-content {
                font-size: 15px;
            }

            .article-content h2 {
                font-size: 20px;
                margin: 28px 0 14px;
            }

            .article-content h3 {
                font-size: 17px;
                margin: 22px 0 10px;
            }
        }

/* roulang page: category3 */
:root {
            --primary: #0d9488;
            --primary-light: #f0fdfa;
            --accent: #f97316;
            --text-main: #1e293b;
            --text-muted: #64748b;
            --border: #f1f5f9;
            --bg: #f8fafc;
            --radius-card: 24px;
            --radius-btn: 9999px;
            --shadow-card: 0 4px 24px rgba(13, 148, 136, 0.06);
            --shadow-hover: 0 20px 40px rgba(13, 148, 136, 0.12);
        }
        html {
            scroll-behavior: smooth;
            scroll-padding-top: 120px;
        }
        body {
            background-color: var(--bg);
            color: var(--text-main);
            font-family: 'ui-sans-serif', '-apple-system', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            line-height: 1.7;
        }
        .brand-gradient {
            background: linear-gradient(115deg, #14b8a6 0%, #06b6d4 50%, #3b82f6 100%);
        }
        .accent-gradient {
            background: linear-gradient(115deg, #f97316 0%, #f59e0b 100%);
        }
        .text-gradient {
            background: linear-gradient(115deg, #14b8a6 0%, #06b6d4 50%, #3b82f6 100%);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .scrollbar-hide::-webkit-scrollbar {
            display: none;
        }
        .scrollbar-hide {
            -ms-overflow-style: none;
            scrollbar-width: none;
        }
        .timeline-line {
            border-left: 2px solid #99f6e4;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }
        .faq-icon {
            transition: transform 0.3s ease;
        }
        img {
            -webkit-user-drag: none;
        }
        a,
        button {
            transition: all 0.3s ease;
        }
        button:focus-visible,
        a:focus-visible {
            outline: none;
            box-shadow: 0 0 0 4px rgba(13, 148, 136, 0.15);
        }

/* roulang page: category2 */
:root {
            --primary-600: #0d9488;
            --primary-100: #ccfbf1;
            --primary-50: #f0fdfa;
            --accent-500: #f97316;
            --bg-main: #f8fafc;
            --text-body: #1e293b;
            --text-muted: #64748b;
            --border-soft: #f1f5f9;
        }
        * {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            scroll-padding-top: 112px;
        }
        body {
            margin: 0;
            background: var(--bg-main);
            color: var(--text-body);
            font-family: 'ui-sans-serif', -apple-system, 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: inherit;
            text-decoration: none;
        }
        img {
            max-width: 100%;
            display: block;
        }
        button {
            background: none;
            border: none;
            cursor: pointer;
        }
        .top-gradient-line {
            height: 3px;
            background: linear-gradient(115deg, #14b8a6 0%, #06b6d4 50%, #3b82f6 100%);
        }
        .brand-gradient {
            background: linear-gradient(115deg, #14b8a6 0%, #06b6d4 50%, #3b82f6 100%);
        }
        .accent-gradient {
            background: linear-gradient(115deg, #f97316 0%, #f59e0b 100%);
        }
        .brand-gradient-text {
            background: linear-gradient(115deg, #14b8a6 0%, #06b6d4 50%, #3b82f6 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .scrollbar-hide::-webkit-scrollbar {
            display: none;
        }
        .scrollbar-hide {
            -ms-overflow-style: none;
            scrollbar-width: none;
        }
        .card-hover {
            transition: transform .3s ease, box-shadow .3s ease;
        }
        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 40px rgba(13, 148, 136, 0.12);
        }
        .btn-press:active {
            transform: scale(.98);
            opacity: .9;
        }
        a,
        button {
            transition: all .2s ease;
        }
        .section-padding {
            padding: 4rem 0;
        }
        @media (min-width: 768px) {
            .section-padding {
                padding: 6rem 0;
            }
        }