/* roulang page: index */
:root {
            --primary: hsl(216, 45%, 52%);
            --primary-dark: hsl(221, 50%, 38%);
            --accent: hsl(38, 92%, 55%);
            --surface: hsl(210, 35%, 97%);
            --ink: hsl(220, 25%, 22%);
            --ink-soft: hsl(216, 15%, 50%);
            --border: hsl(215, 20%, 90%);
            --card-radius: 16px;
            --card-shadow: 0 4px 20px rgba(30, 64, 120, 0.06);
            --card-shadow-hover: 0 8px 30px rgba(30, 64, 120, 0.12);
            --transition: all 0.2s ease;
        }

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

        body {
            font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            background: var(--surface);
            color: var(--ink);
            line-height: 1.75;
            margin: 0;
        }

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

        a {
            text-decoration: none;
            color: inherit;
        }

        .container-site {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .section-tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 999px;
            background: hsl(215, 30%, 95%);
            color: var(--primary);
            font-size: 0.875rem;
            font-weight: 600;
            letter-spacing: 0.02em;
        }

        .nav-chip {
            display: inline-flex;
            align-items: center;
            padding: 8px 20px;
            border-radius: 999px;
            background: hsl(215, 30%, 95%);
            color: var(--ink);
            font-size: 0.9rem;
            font-weight: 500;
            transition: var(--transition);
            white-space: nowrap;
        }

        .nav-chip:hover {
            background: hsl(215, 30%, 92%);
            color: var(--primary-dark);
        }

        .nav-chip.active {
            background: var(--primary);
            color: #fff;
            font-weight: 600;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 24px;
            border-radius: 8px;
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(30, 64, 120, 0.2);
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 24px;
            border-radius: 8px;
            background: #fff;
            border: 1px solid var(--primary);
            color: var(--primary);
            font-weight: 600;
            transition: var(--transition);
            cursor: pointer;
        }

        .btn-outline:hover {
            background: hsla(216, 45%, 52%, 0.05);
        }

        .btn-accent {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            border-radius: 8px;
            background: var(--accent);
            color: #333;
            font-weight: 700;
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }

        .btn-accent:hover {
            filter: brightness(1.08);
            box-shadow: inset 0 -2px 0 rgba(0, 0, 0, 0.1);
            transform: translateY(-2px);
        }

        .card-hover {
            transition: var(--transition);
        }

        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: var(--card-shadow-hover);
        }

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

        .faq-item.active {
            border-left: 3px solid var(--primary);
            box-shadow: var(--card-shadow);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.25s ease;
        }

        .faq-item.active .faq-answer {
            max-height: 400px;
        }

        .faq-item .fa-plus {
            transition: transform 0.25s ease;
        }

        .faq-item.active .fa-plus {
            transform: rotate(45deg);
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 3px solid hsla(216, 45%, 52%, 0.35);
            outline-offset: 2px;
        }

        .tabular-nums {
            font-variant-numeric: tabular-nums;
        }

        .img-mask {
            position: relative;
            overflow: hidden;
            display: block;
        }

        .img-mask img {
            transition: transform 0.4s ease;
        }

        .img-mask:hover img {
            transform: scale(1.03);
        }

        .img-mask .mask-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            padding: 20px;
            background: linear-gradient(to top, rgba(0, 0, 0, 0.6), transparent);
            color: #fff;
            opacity: 0;
            transition: opacity 0.3s ease;
            font-size: 0.95rem;
            font-weight: 500;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .img-mask:hover .mask-overlay {
            opacity: 1;
        }

        .nav-scroll::-webkit-scrollbar {
            display: none;
        }

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

        .hero-img-shadow {
            box-shadow: 0 20px 60px rgba(30, 64, 120, 0.15);
        }

        .news-list-item {
            border-bottom: 1px solid var(--border);
            transition: var(--transition);
        }

        .news-list-item:last-child {
            border-bottom: none;
        }

        .news-list-item:hover {
            background: hsl(210, 35%, 97%);
        }

        .footer-link {
            color: rgba(255, 255, 255, 0.7);
            transition: var(--transition);
        }

        .footer-link:hover {
            color: #fff;
        }

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

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

/* roulang page: article */
:root {
            --primary: hsl(216, 45%, 52%);
            --primary-dark: hsl(221, 50%, 38%);
            --accent: hsl(38, 92%, 55%);
            --accent-light: hsl(40, 95%, 62%);
            --bg: hsl(210, 35%, 97%);
            --white: #ffffff;
            --text: hsl(220, 25%, 22%);
            --text-light: hsl(216, 15%, 50%);
            --border: hsl(215, 20%, 90%);
            --radius: 0.9rem;
            --shadow-sm: 0 4px 20px rgba(30, 64, 120, 0.06);
            --shadow-md: 0 8px 30px rgba(30, 64, 120, 0.12);
            --transition: all 0.2s ease;
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }
        .container-site {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.25rem;
        }
        .nav-chip {
            display: inline-flex;
            align-items: center;
            padding: 0.5rem 1.1rem;
            border-radius: 999px;
            font-size: 0.9rem;
            font-weight: 500;
            color: hsl(216, 15%, 40%);
            background: hsl(215, 30%, 95%);
            transition: var(--transition);
            white-space: nowrap;
            text-decoration: none;
        }
        .nav-chip:hover {
            background: hsl(215, 30%, 88%);
            color: var(--primary-dark);
        }
        .nav-chip.active {
            background: var(--primary);
            color: #fff;
            font-weight: 600;
        }
        .nav-scroll {
            -ms-overflow-style: none;
            scrollbar-width: none;
        }
        .nav-scroll::-webkit-scrollbar {
            display: none;
        }
        .btn-accent {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            background: var(--accent);
            color: hsl(220, 25%, 18%);
            font-weight: 700;
            padding: 0.65rem 1.5rem;
            border-radius: 0.6rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
            font-size: 0.95rem;
            text-decoration: none;
        }
        .btn-accent:hover {
            background: var(--accent-light);
            transform: translateY(-2px);
            box-shadow: inset 0 -2px 0 rgba(0, 0, 0, 0.08);
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            padding: 0.7rem 1.6rem;
            border-radius: 0.6rem;
            transition: var(--transition);
            text-decoration: none;
            border: none;
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            background: transparent;
            color: var(--primary);
            font-weight: 600;
            padding: 0.65rem 1.5rem;
            border-radius: 0.6rem;
            transition: var(--transition);
            border: 1.5px solid var(--primary);
            text-decoration: none;
        }
        .btn-outline:hover {
            background: hsla(216, 45%, 52%, 0.06);
        }
        .footer-link {
            color: rgba(255, 255, 255, 0.6);
            transition: var(--transition);
            text-decoration: none;
        }
        .footer-link:hover {
            color: #fff;
        }
        .breadcrumb a {
            color: var(--text-light);
            transition: var(--transition);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .article-body {
            font-size: 1rem;
            line-height: 1.9;
            color: var(--text);
            word-break: break-word;
        }
        .article-body p {
            margin-bottom: 1.6em;
        }
        .article-body h2 {
            font-size: 1.5rem;
            font-weight: 700;
            margin: 2.2em 0 0.9em;
            line-height: 1.35;
            color: var(--text);
        }
        .article-body h3 {
            font-size: 1.25rem;
            font-weight: 600;
            margin: 1.8em 0 0.7em;
            line-height: 1.4;
            color: var(--text);
        }
        .article-body h4 {
            font-size: 1.05rem;
            font-weight: 600;
            margin: 1.5em 0 0.6em;
            color: var(--text);
        }
        .article-body a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 3px;
            word-break: break-all;
        }
        .article-body a:hover {
            color: var(--primary-dark);
        }
        .article-body blockquote {
            border-left: 4px solid var(--primary);
            background: hsl(215, 35%, 97%);
            padding: 1rem 1.5rem;
            margin: 1.8em 0;
            border-radius: 0 0.6rem 0.6rem 0;
            color: hsl(216, 15%, 40%);
        }
        .article-body img {
            max-width: 100%;
            border-radius: 0.75rem;
            margin: 1.6em 0;
            height: auto;
        }
        .article-body figure {
            margin: 2em 0;
        }
        .article-body figcaption {
            text-align: center;
            font-size: 0.85rem;
            color: var(--text-light);
            margin-top: -0.8em;
            margin-bottom: 1.5em;
        }
        .article-body ul,
        .article-body ol {
            margin: 1.2em 0 1.6em 1.3em;
        }
        .article-body li {
            margin-bottom: 0.5em;
        }
        .article-body ul li {
            list-style: disc;
        }
        .article-body ol li {
            list-style: decimal;
        }
        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.8em 0;
            font-size: 0.95rem;
        }
        .article-body th,
        .article-body td {
            padding: 0.75rem 1rem;
            border: 1px solid var(--border);
            text-align: left;
        }
        .article-body th {
            background: hsl(215, 30%, 96%);
            font-weight: 600;
        }
        .article-body hr {
            border: none;
            border-top: 1px solid var(--border);
            margin: 2.5em 0;
        }
        .card-hover {
            transition: var(--transition);
        }
        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 3px solid hsla(216, 45%, 52%, 0.35);
            outline-offset: 2px;
        }
        @media (max-width: 768px) {
            .container-site {
                padding: 0 1rem;
            }
            .article-body {
                font-size: 0.95rem;
                line-height: 1.85;
            }
            .article-body h2 {
                font-size: 1.3rem;
            }
        }
        @media (max-width: 520px) {
            .btn-accent {
                padding: 0.55rem 1rem;
                font-size: 0.85rem;
            }
        }

/* roulang page: category1 */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;600;700;800&display=swap');
        :root {
            --primary: hsl(216, 45%, 52%);
            --primary-dark: hsl(221, 50%, 38%);
            --accent: hsl(38, 92%, 55%);
            --bg: hsl(210, 35%, 97%);
            --ink: hsl(220, 25%, 22%);
            --muted: hsl(216, 15%, 50%);
            --border: hsl(215, 20%, 90%);
            --radius: 1rem;
            --shadow: 0 4px 20px rgba(30, 64, 120, 0.06);
            --shadow-hover: 0 8px 30px rgba(30, 64, 120, 0.12);
            --transition: all 0.2s ease;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            background: var(--bg);
            color: var(--ink);
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }

        .container-site {
            max-width: 1200px;
            margin-inline: auto;
            padding-inline: 1rem;
        }

        a {
            text-decoration: none;
            color: inherit;
        }

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

        button,
        input {
            font-family: inherit;
        }

        a:focus-visible,
        button:focus-visible {
            outline: 3px solid hsla(216, 45%, 52%, 0.35);
            outline-offset: 2px;
            border-radius: 4px;
        }

        /* 按钮系统 */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            background-color: var(--primary);
            color: #fff;
            font-weight: 600;
            font-size: 0.9375rem;
            padding: 0.75rem 1.5rem;
            border-radius: 0.5rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }
        .btn-primary:hover {
            background-color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow);
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            background: #fff;
            border: 1px solid var(--primary);
            color: var(--primary);
            font-weight: 600;
            font-size: 0.9375rem;
            padding: 0.75rem 1.5rem;
            border-radius: 0.5rem;
            transition: var(--transition);
            cursor: pointer;
        }
        .btn-outline:hover {
            background: hsla(216, 45%, 52%, 0.05);
        }

        .btn-accent {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            background-color: var(--accent);
            color: hsl(220, 25%, 22%);
            font-weight: 700;
            font-size: 0.9375rem;
            padding: 0.75rem 1.5rem;
            border-radius: 0.5rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }
        .btn-accent:hover {
            filter: brightness(1.06);
            box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.25);
        }

        .btn-white-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.5);
            color: #fff;
            font-weight: 600;
            font-size: 0.9375rem;
            padding: 0.75rem 1.5rem;
            border-radius: 0.5rem;
            transition: var(--transition);
            cursor: pointer;
        }
        .btn-white-outline:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(255, 255, 255, 0.8);
        }

        /* 导航 */
        .nav-chip {
            display: inline-flex;
            align-items: center;
            padding: 0.5rem 1.25rem;
            border-radius: 999px;
            font-size: 0.875rem;
            font-weight: 500;
            color: var(--muted);
            background: hsl(215, 30%, 95%);
            transition: var(--transition);
            white-space: nowrap;
        }
        .nav-chip:hover {
            color: var(--primary);
            background: hsla(216, 45%, 52%, 0.08);
        }
        .nav-chip.active {
            background: var(--primary);
            color: #fff;
            font-weight: 600;
        }

        .nav-scroll {
            scrollbar-width: none;
            -ms-overflow-style: none;
        }
        .nav-scroll::-webkit-scrollbar {
            display: none;
        }

        /* 页脚链接 */
        .footer-link {
            transition: var(--transition);
            color: rgba(255, 255, 255, 0.7);
        }
        .footer-link:hover {
            color: #fff;
        }

        /* 分类页卡片 */
        .category-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .category-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .category-card .card-icon {
            width: 48px;
            height: 48px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.25rem;
            background: hsla(216, 45%, 52%, 0.1);
            color: var(--primary);
            transition: var(--transition);
        }
        .category-card:hover .card-icon {
            background: var(--primary);
            color: #fff;
        }

        /* 步骤条 */
        .step-item {
            background: #fff;
            border-radius: 1rem;
            border: 1px solid var(--border);
            padding: 1.75rem;
            position: relative;
            transition: var(--transition);
            box-shadow: var(--shadow);
        }
        .step-item:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .step-number {
            font-size: 2rem;
            font-weight: 800;
            color: hsla(216, 45%, 52%, 0.15);
            font-variant-numeric: tabular-nums;
            line-height: 1;
        }
        .step-line {
            position: absolute;
            top: 2.5rem;
            right: -1.5rem;
            width: 2.5rem;
            height: 1px;
            background: var(--border);
            display: none;
        }
        @media (min-width: 768px) {
            .step-line {
                display: block;
            }
        }

        /* FAQ */
        .faq-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: 0.75rem;
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item.open {
            border-left: 3px solid var(--primary);
            box-shadow: var(--shadow);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            padding: 1.1rem 1.25rem;
            font-weight: 600;
            font-size: 1rem;
            color: var(--ink);
            background: transparent;
            border: none;
            cursor: pointer;
            text-align: left;
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.25s ease;
            padding: 0 1.25rem;
            color: var(--muted);
            font-size: 0.9375rem;
            line-height: 1.8;
        }
        .faq-item.open .faq-answer {
            max-height: 500px;
            padding-bottom: 1.25rem;
        }
        .faq-icon {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: hsl(215, 30%, 95%);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-icon {
            background: var(--primary);
            color: #fff;
            transform: rotate(135deg);
        }

        /* 图文条 */
        .scene-item {
            display: flex;
            gap: 1rem;
            padding: 1rem;
            border-radius: 0.75rem;
            transition: background 0.2s ease;
        }
        .scene-item:hover {
            background: hsl(215, 35%, 96%);
        }
        .scene-icon {
            width: 40px;
            height: 40px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            background: hsla(216, 45%, 52%, 0.1);
            color: var(--primary);
        }

        /* 图片遮罩 */
        .img-wrap {
            position: relative;
            overflow: hidden;
            border-radius: 12px;
        }
        .img-wrap img {
            transition: transform 0.3s ease;
        }
        .img-wrap:hover img {
            transform: scale(1.03);
        }

        /* 数字特性 */
        .tabular-nums {
            font-variant-numeric: tabular-nums;
        }

        /* 底部切换链接 */
        .cat-switch-link {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.875rem;
            transition: var(--transition);
            padding: 0.5rem 1rem;
            border-radius: 999px;
        }
        .cat-switch-link:hover {
            color: #fff;
            background: rgba(255, 255, 255, 0.1);
        }

/* roulang page: category3 */
:root {
            --primary: hsl(216, 45%, 52%);
            --primary-dark: hsl(221, 50%, 38%);
            --accent: hsl(38, 92%, 55%);
            --surface: hsl(210, 35%, 97%);
            --ink: hsl(220, 25%, 22%);
            --muted: hsl(216, 15%, 50%);
            --line: hsl(215, 20%, 90%);
            --radius: 1rem;
            --shadow-sm: 0 4px 20px rgba(30, 64, 120, 0.06);
            --shadow-lg: 0 8px 30px rgba(30, 64, 120, 0.12);
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            font-size: 1rem;
            line-height: 1.75;
            color: var(--ink);
            background: var(--surface);
            -webkit-font-smoothing: antialiased;
        }

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

        a {
            color: inherit;
            text-decoration: none;
        }

        button {
            font-family: inherit;
        }

        .container-site {
            max-width: 1200px;
            margin-inline: auto;
            padding-inline: 1rem;
        }

        @media (min-width: 768px) {
            .container-site {
                padding-inline: 1.5rem;
            }
        }

        /* 导航分段控件 */
        .nav-chip {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 0.4rem 1.1rem;
            border-radius: 999px;
            font-size: 0.875rem;
            font-weight: 500;
            color: hsl(216, 15%, 40%);
            background: hsl(215, 30%, 95%);
            white-space: nowrap;
            transition: all 0.2s ease;
        }
        .nav-chip:hover {
            background: hsl(215, 30%, 88%);
            color: var(--ink);
        }
        .nav-chip.active {
            background: var(--primary);
            color: #fff;
            font-weight: 600;
        }

        .nav-scroll::-webkit-scrollbar {
            height: 0;
        }
        .nav-scroll {
            scrollbar-width: none;
        }

        /* 按钮 */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            padding: 0.75rem 1.5rem;
            border-radius: 0.5rem;
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            font-size: 0.9375rem;
            border: none;
            cursor: pointer;
            transition: all 0.2s ease;
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(30, 64, 120, 0.2);
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            padding: 0.75rem 1.5rem;
            border-radius: 0.5rem;
            background: #fff;
            border: 1px solid var(--primary);
            color: var(--primary);
            font-weight: 600;
            font-size: 0.9375rem;
            cursor: pointer;
            transition: all 0.2s ease;
        }
        .btn-outline:hover {
            background: hsla(216, 45%, 52%, 0.05);
            transform: translateY(-2px);
        }

        .btn-accent {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            padding: 0.7rem 1.5rem;
            border-radius: 0.5rem;
            background: var(--accent);
            color: var(--ink);
            font-weight: 700;
            font-size: 0.9375rem;
            border: none;
            cursor: pointer;
            transition: all 0.2s ease;
        }
        .btn-accent:hover {
            filter: brightness(1.06);
            box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.06), 0 6px 20px rgba(180, 130, 20, 0.2);
            transform: translateY(-2px);
        }

        .btn-light {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            padding: 0.75rem 1.5rem;
            border-radius: 0.5rem;
            background: rgba(255, 255, 255, 0.15);
            color: #fff;
            font-weight: 600;
            font-size: 0.9375rem;
            border: 1px solid rgba(255, 255, 255, 0.3);
            cursor: pointer;
            transition: all 0.2s ease;
        }
        .btn-light:hover {
            background: rgba(255, 255, 255, 0.25);
            transform: translateY(-2px);
        }

        /* 卡片 */
        .card-base {
            background: #fff;
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            transition: all 0.2s ease;
        }
        a.card-base:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
        }

        /* 标签 */
        .tag {
            display: inline-flex;
            align-items: center;
            padding: 0.25rem 0.75rem;
            border-radius: 999px;
            background: hsla(216, 45%, 52%, 0.1);
            color: var(--primary);
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.02em;
        }

        /* 统计卡 */
        .stat-card {
            background: #fff;
            border-radius: 1rem;
            padding: 1.5rem 1rem;
            text-align: center;
            box-shadow: var(--shadow-sm);
            transition: all 0.2s ease;
        }
        .stat-card:hover {
            box-shadow: var(--shadow-lg);
        }
        .stat-card .number {
            font-size: clamp(1.75rem, 3vw, 2.25rem);
            font-weight: 800;
            color: var(--ink);
            font-variant-numeric: tabular-nums;
            line-height: 1.2;
        }
        .stat-card .label {
            font-size: 0.875rem;
            color: var(--muted);
            margin-top: 0.25rem;
        }

        /* 流程 */
        .step-item {
            display: flex;
            align-items: flex-start;
            gap: 1rem;
            padding: 1.25rem;
            background: #fff;
            border-radius: 0.75rem;
            border: 1px solid var(--line);
            transition: box-shadow 0.2s ease;
        }
        .step-item:hover {
            box-shadow: var(--shadow-sm);
        }
        .step-num {
            width: 2.25rem;
            height: 2.25rem;
            border-radius: 999px;
            background: var(--primary);
            color: #fff;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.875rem;
            flex-shrink: 0;
        }
        .step-title {
            font-size: 1rem;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 0.15rem;
        }
        .step-desc {
            font-size: 0.875rem;
            color: var(--muted);
            line-height: 1.6;
        }

        /* FAQ */
        .faq-item {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: 0.75rem;
            overflow: hidden;
            transition: border-color 0.25s ease, box-shadow 0.25s ease;
        }
        .faq-item.active {
            border-left: 3px solid var(--primary);
            box-shadow: var(--shadow-sm);
        }
        .faq-btn {
            width: 100%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
            padding: 1.25rem 1.25rem;
            background: transparent;
            border: none;
            text-align: left;
            cursor: pointer;
            font-size: 1rem;
            font-weight: 600;
            color: var(--ink);
            transition: background 0.2s ease;
        }
        .faq-btn:hover {
            background: hsl(210, 35%, 97%);
        }
        .faq-icon {
            width: 28px;
            height: 28px;
            border-radius: 999px;
            background: hsl(215, 30%, 95%);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 0.875rem;
            color: var(--primary);
            flex-shrink: 0;
            transition: transform 0.25s ease, background 0.2s ease;
        }
        .faq-item.active .faq-icon {
            background: var(--primary);
            color: #fff;
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.25s ease;
        }
        .faq-answer-inner {
            padding: 0 1.25rem 1.25rem;
            color: var(--muted);
            font-size: 0.9375rem;
            line-height: 1.8;
        }

        /* 页脚链接 */
        .footer-link {
            color: rgba(255, 255, 255, 0.7);
            transition: color 0.2s ease, padding-left 0.2s ease;
        }
        .footer-link:hover {
            color: #fff;
            padding-left: 4px;
        }

        /* 焦点可见性 */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 3px solid hsla(216, 45%, 52%, 0.35);
            outline-offset: 2px;
            border-radius: 0.25rem;
        }

        /* 区块间距 */
        .section-pad {
            padding-block: 4rem;
        }
        @media (max-width: 768px) {
            .section-pad {
                padding-block: 2.5rem;
            }
        }

        .heading-lg {
            font-size: clamp(1.5rem, 2vw + 0.5rem, 2.2rem);
            font-weight: 700;
            color: var(--ink);
            line-height: 1.25;
            letter-spacing: -0.01em;
        }

/* roulang page: category2 */
:root {
    --primary: hsl(216, 45%, 52%);
    --primary-dark: hsl(221, 50%, 38%);
    --accent: hsl(38, 92%, 55%);
    --surface: hsl(210, 35%, 97%);
    --ink: hsl(220, 25%, 22%);
    --muted: hsl(216, 15%, 50%);
    --line: hsl(215, 20%, 90%);
    --radius: 1rem;
    --shadow: 0 4px 20px rgba(30, 64, 120, 0.06);
    --shadow-hover: 0 8px 30px rgba(30, 64, 120, 0.12);
}
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
body {
    font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
    background-color: var(--surface);
    color: var(--ink);
    line-height: 1.75;
    font-size: 16px;
}
img {
    display: block;
    max-width: 100%;
    height: auto;
}
a {
    text-decoration: none;
    color: inherit;
}
button {
    font-family: inherit;
    border: none;
    background: none;
    cursor: pointer;
}
.container-site {
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 1rem;
    padding-right: 1rem;
}
@media (min-width: 768px) {
    .container-site {
        padding-left: 1.5rem;
        padding-right: 1.5rem;
    }
}
.nav-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1.1rem;
    border-radius: 999px;
    background-color: hsl(215, 30%, 95%);
    color: var(--ink);
    font-size: 0.875rem;
    font-weight: 500;
    white-space: nowrap;
    transition: all 0.2s ease;
    text-decoration: none;
    line-height: 1.4;
}
.nav-chip:hover {
    background-color: hsl(215, 25%, 91%);
    color: var(--primary-dark);
}
.nav-chip:focus-visible {
    outline: 3px solid hsla(216, 45%, 52%, 0.35);
    outline-offset: 2px;
}
.nav-chip.active {
    background-color: var(--primary);
    color: #fff;
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(65, 102, 150, 0.25);
}
.nav-scroll::-webkit-scrollbar {
    display: none;
}
.nav-scroll {
    scrollbar-width: none;
    -ms-overflow-style: none;
}
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    background-color: var(--primary);
    color: #fff;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.2s ease;
    text-decoration: none;
    white-space: nowrap;
    border: 1px solid transparent;
}
.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(65, 102, 150, 0.25);
}
.btn-primary:focus-visible {
    outline: 3px solid hsla(216, 45%, 52%, 0.35);
    outline-offset: 2px;
}
.btn-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    background-color: #fff;
    color: var(--primary);
    border: 1px solid var(--primary);
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.2s ease;
    text-decoration: none;
    white-space: nowrap;
}
.btn-outline:hover {
    background-color: hsla(216, 45%, 52%, 0.05);
    transform: translateY(-1px);
}
.btn-outline:focus-visible {
    outline: 3px solid hsla(216, 45%, 52%, 0.35);
    outline-offset: 2px;
}
.btn-accent {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    background-color: var(--accent);
    color: hsl(220, 40%, 18%);
    font-weight: 700;
    font-size: 0.95rem;
    transition: all 0.2s ease;
    text-decoration: none;
    white-space: nowrap;
    border: none;
}
.btn-accent:hover {
    filter: brightness(1.08);
    box-shadow: 0 4px 16px rgba(217, 153, 32, 0.35);
    transform: translateY(-1px);
}
.btn-accent:focus-visible {
    outline: 3px solid hsla(38, 92%, 55%, 0.4);
    outline-offset: 2px;
}
.card-base {
    background-color: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: all 0.2s ease;
    border: 1px solid rgba(30, 64, 120, 0.04);
}
.card-hover {
    transition: all 0.2s ease;
}
.card-hover:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}
.tag-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.2rem 0.7rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 500;
    line-height: 1.6;
    background-color: hsl(215, 35%, 94%);
    color: var(--primary-dark);
    letter-spacing: 0.02em;
}
.tag-badge-accent {
    background-color: hsla(38, 92%, 55%, 0.15);
    color: hsl(220, 40%, 30%);
}
.tag-badge-green {
    background-color: rgba(22, 163, 74, 0.1);
    color: #166534;
}
.section-padding {
    padding-block: 3.5rem;
}
@media (min-width: 768px) {
    .section-padding {
        padding-block: 4rem;
    }
}
.faq-item {
    background-color: #fff;
    border-radius: 0.75rem;
    border: 1px solid rgba(30, 64, 120, 0.06);
    box-shadow: var(--shadow);
    transition: all 0.2s ease;
    padding: 0.25rem 1.25rem;
}
.faq-item.open {
    border-left: 3px solid var(--primary);
    box-shadow: var(--shadow-hover);
}
.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    text-align: left;
    padding: 1rem 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--ink);
    transition: color 0.2s ease;
}
.faq-question:hover {
    color: var(--primary-dark);
}
.faq-question:focus-visible {
    outline: 3px solid hsla(216, 45%, 52%, 0.35);
    outline-offset: 2px;
    border-radius: 0.25rem;
}
.faq-icon-container {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 1px solid var(--line);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all 0.3s ease;
    background-color: #fff;
}
.faq-item.open .faq-icon-container {
    background-color: var(--primary);
    border-color: var(--primary);
    color: #fff;
    transform: rotate(135deg);
}
.faq-icon {
    font-size: 0.75rem;
    transition: transform 0.3s ease;
}
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
}
.faq-item.open .faq-answer {
    max-height: 500px;
}
.faq-answer p {
    padding-bottom: 1.25rem;
    color: var(--muted);
    font-size: 0.95rem;
    line-height: 1.8;
}
.footer-link {
    color: rgba(255, 255, 255, 0.6);
    transition: all 0.2s ease;
    text-decoration: none;
}
.footer-link:hover {
    color: #fff;
}
.footer-link:focus-visible {
    outline: 3px solid rgba(255, 255, 255, 0.35);
    outline-offset: 2px;
    border-radius: 0.25rem;
}
.img-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(20, 40, 70, 0.6) 0%, rgba(20, 40, 70, 0) 45%);
    opacity: 0;
    transition: opacity 0.25s ease;
    display: flex;
    align-items: flex-end;
    padding: 1.25rem;
}
.img-wrap:hover .img-overlay {
    opacity: 1;
}
.img-wrap img {
    transition: transform 0.4s ease;
}
.img-wrap:hover img {
    transform: scale(1.03);
}
.img-wrap:focus-visible {
    outline: 3px solid hsla(216, 45%, 52%, 0.4);
    outline-offset: 2px;
    border-radius: var(--radius);
}
.step-item {
    position: relative;
    padding: 1.5rem;
    background-color: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: all 0.2s ease;
    border-top: 3px solid transparent;
}
.step-item:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
    border-top-color: var(--primary);
}
.step-number {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background-color: var(--primary);
    color: #fff;
    font-weight: 700;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-variant-numeric: tabular-nums;
    margin-bottom: 0.75rem;
}
.cat-switch-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    background: #fff;
    border-radius: var(--radius);
    padding: 1.5rem 1.75rem;
    box-shadow: var(--shadow);
    transition: all 0.2s ease;
    border: 1px solid rgba(30, 64, 120, 0.04);
}
.cat-switch-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}
.cat-switch-card .icon-box {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 1.25rem;
}
:focus-visible {
    outline: 3px solid hsla(216, 45%, 52%, 0.35);
    outline-offset: 2px;
}
.numeric {
    font-variant-numeric: tabular-nums;
}
.text-balance {
    text-wrap: balance;
}