/* roulang page: index */
:root {
            --primary: #1E60F2;
            --primary-hover: #154ac1;
            --accent: #00D2B4;
            --deep-base: #0B1220;
            --light-bg: #F7F9FC;
            --surface: #FFFFFF;
            --text-main: #1E293B;
            --text-muted: #64748B;
            --border-color: rgba(30, 96, 242, 0.08);
            --border-solid: #E4E9F2;
            --radius-sm: 0.375rem;
            --radius-md: 0.75rem;
            --radius-lg: 1.25rem;
            --radius-pill: 9999px;
            --shadow-subtle: 0 4px 20px -2px rgba(11, 18, 32, 0.05);
            --shadow-hover: 0 12px 28px -4px rgba(30, 96, 242, 0.12);
        }
        body {
            font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: var(--surface);
            line-height: 1.6;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.25s ease;
        }
        .site-header {
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-solid);
            position: sticky;
            top: 0;
            z-index: 1020;
            box-shadow: 0 2px 10px rgba(11, 18, 32, 0.03);
        }
        .navbar-brand-logo {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--deep-base);
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            letter-spacing: -0.5px;
        }
        .navbar-brand-logo .brand-icon {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--primary), var(--accent));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.25rem;
        }
        .navbar-nav .nav-link {
            font-weight: 500;
            color: #334155;
            padding: 0.5rem 1rem !important;
            position: relative;
            font-size: 0.95rem;
        }
        .navbar-nav .nav-link:hover,
        .navbar-nav .nav-link.active {
            color: var(--primary);
        }
        .navbar-nav .nav-link.active::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 1rem;
            right: 1rem;
            height: 2px;
            background-color: var(--primary);
            border-radius: var(--radius-pill);
        }
        .btn-primary-custom {
            background-color: var(--primary);
            color: #ffffff;
            border: 1px solid var(--primary);
            border-radius: var(--radius-pill);
            padding: 0.65rem 1.6rem;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            box-shadow: 0 4px 14px rgba(30, 96, 242, 0.25);
            transition: all 0.3s ease;
        }
        .btn-primary-custom:hover {
            background-color: var(--primary-hover);
            border-color: var(--primary-hover);
            color: #ffffff;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(30, 96, 242, 0.35);
        }
        .btn-outline-custom {
            border: 1px solid var(--border-solid);
            background: #fff;
            color: var(--deep-base);
            border-radius: var(--radius-pill);
            padding: 0.65rem 1.5rem;
            font-weight: 600;
            transition: all 0.25s ease;
        }
        .btn-outline-custom:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: #F0F5FF;
        }
        .section-padding {
            padding: 5rem 0;
        }
        @media (max-width: 768px) {
            .section-padding {
                padding: 3rem 0;
            }
        }
        .bg-light-alt {
            background-color: var(--light-bg);
        }
        .bg-white-alt {
            background-color: var(--surface);
        }
        .section-header {
            margin-bottom: 3rem;
        }
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            color: var(--deep-base);
            position: relative;
            padding-bottom: 0.85rem;
            letter-spacing: -0.5px;
        }
        .section-title::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 0;
            width: 44px;
            height: 3px;
            background: var(--primary);
            border-radius: var(--radius-pill);
        }
        .section-header.text-center .section-title::after {
            left: 50%;
            transform: translateX(-50%);
        }
        .section-desc {
            color: var(--text-muted);
            font-size: 1rem;
            margin-top: 0.75rem;
            max-width: 760px;
        }
        .section-header.text-center .section-desc {
            margin-left: auto;
            margin-right: auto;
        }
        .hero-banner {
            position: relative;
            background-color: var(--deep-base);
            background-image: linear-gradient(135deg, rgba(11, 18, 32, 0.94), rgba(30, 96, 242, 0.82)), url('/assets/images/d01580cf396de78b.webp');
            background-size: cover;
            background-position: center;
            color: #ffffff;
            padding: 5rem 0 4rem 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        .hero-h1 {
            font-size: 2.75rem;
            font-weight: 800;
            line-height: 1.25;
            letter-spacing: -0.5px;
            margin-bottom: 1.25rem;
        }
        @media (max-width: 768px) {
            .hero-h1 {
                font-size: 1.85rem;
            }
        }
        .hero-lead {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.85);
            line-height: 1.8;
            margin-bottom: 2rem;
            max-width: 680px;
        }
        .hero-spec-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(8px);
            padding: 0.35rem 0.95rem;
            border-radius: var(--radius-pill);
            font-size: 0.85rem;
            color: #E2E8F0;
            margin-bottom: 1.25rem;
            border: 1px solid rgba(255, 255, 255, 0.15);
        }
        .hero-metric-bar {
            background: rgba(255, 255, 255, 0.08);
            backdrop-filter: blur(16px);
            border: 1px solid rgba(255, 255, 255, 0.15);
            border-radius: var(--radius-md);
            padding: 1.5rem;
            margin-top: 3rem;
        }
        .metric-value {
            font-size: 2.25rem;
            font-weight: 800;
            color: #ffffff;
            line-height: 1;
            font-feature-settings: "tnum";
        }
        .metric-value span {
            font-size: 1rem;
            font-weight: 500;
            color: var(--accent);
            margin-left: 0.25rem;
        }
        .metric-label {
            font-size: 0.875rem;
            color: rgba(255, 255, 255, 0.7);
            margin-top: 0.4rem;
        }
        .app-card {
            background: var(--surface);
            border: 1px solid var(--border-solid);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-subtle);
            transition: all 0.3s ease;
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .app-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
            border-color: rgba(30, 96, 242, 0.2);
        }
        .card-thumb-wrap {
            position: relative;
            overflow: hidden;
            border-top-left-radius: calc(var(--radius-md) - 1px);
            border-top-right-radius: calc(var(--radius-md) - 1px);
            background: #E2E8F0;
        }
        .card-thumb-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .app-card:hover .card-thumb-wrap img {
            transform: scale(1.05);
        }
        .card-badge-top {
            position: absolute;
            top: 0.75rem;
            left: 0.75rem;
            background: rgba(11, 18, 32, 0.75);
            color: #fff;
            padding: 0.25rem 0.65rem;
            border-radius: var(--radius-pill);
            font-size: 0.75rem;
            font-weight: 600;
            backdrop-filter: blur(4px);
        }
        .badge-subtle {
            background: #EFF6FF;
            color: var(--primary);
            border: 1px solid rgba(30, 96, 242, 0.15);
            border-radius: var(--radius-pill);
            padding: 0.25rem 0.75rem;
            font-size: 0.75rem;
            font-weight: 600;
        }
        .comp-table-card {
            background: var(--surface);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-solid);
            overflow: hidden;
            box-shadow: var(--shadow-subtle);
        }
        .comp-table {
            margin-bottom: 0;
        }
        .comp-table th {
            background: #F8FAFC;
            font-weight: 700;
            color: var(--deep-base);
            padding: 1.2rem 1.5rem;
            border-bottom: 1px solid var(--border-solid);
        }
        .comp-table td {
            padding: 1.15rem 1.5rem;
            vertical-align: middle;
            border-bottom: 1px solid #F1F5F9;
        }
        .comp-highlight {
            background: #F0F6FF;
            font-weight: 700;
            color: var(--primary);
        }
        .timeline-step {
            position: relative;
            padding-left: 2.5rem;
            border-left: 2px solid #E2E8F0;
            padding-bottom: 2.5rem;
        }
        .timeline-step:last-child {
            border-left: 2px solid transparent;
            padding-bottom: 0;
        }
        .timeline-bullet {
            position: absolute;
            left: -9px;
            top: 0;
            width: 16px;
            height: 16px;
            border-radius: 50%;
            background: var(--primary);
            border: 3px solid #fff;
            box-shadow: 0 0 0 3px rgba(30, 96, 242, 0.2);
        }
        .custom-accordion .accordion-item {
            border: 1px solid var(--border-solid);
            border-radius: var(--radius-md) !important;
            margin-bottom: 1rem;
            overflow: hidden;
        }
        .custom-accordion .accordion-button {
            font-weight: 600;
            color: var(--deep-base);
            background-color: #fff;
            box-shadow: none;
            padding: 1.25rem 1.5rem;
        }
        .custom-accordion .accordion-button:not(.collapsed) {
            color: var(--primary);
            background-color: #F0F6FF;
            box-shadow: none;
        }
        .custom-accordion .accordion-button:focus {
            box-shadow: none;
            border-color: rgba(30, 96, 242, 0.25);
        }
        .cta-box {
            background: linear-gradient(135deg, var(--deep-base) 0%, #152A4A 100%);
            border-radius: var(--radius-lg);
            padding: 3.5rem 3rem;
            color: #fff;
            box-shadow: 0 10px 30px rgba(11, 18, 32, 0.15);
        }
        .form-control-custom, .form-select-custom {
            height: 48px;
            border-radius: var(--radius-sm);
            border: 1px solid #CBD5E1;
            padding: 0.65rem 1rem;
            font-size: 0.95rem;
        }
        .form-control-custom:focus, .form-select-custom:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 0.2rem rgba(30, 96, 242, 0.15);
        }
        .site-footer {
            background-color: var(--deep-base);
            color: #94A3B8;
            font-size: 0.9rem;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 4rem 0 2rem 0;
        }
        .footer-heading {
            color: #FFFFFF;
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 1.25rem;
            position: relative;
        }
        .footer-links {
            list-style: none;
            padding-left: 0;
            margin-bottom: 0;
        }
        .footer-links li {
            margin-bottom: 0.65rem;
        }
        .footer-links a:hover {
            color: #FFFFFF;
            padding-left: 3px;
        }
        .footer-bottom {
            margin-top: 3.5rem;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }
        .rank-num {
            width: 32px;
            height: 32px;
            border-radius: var(--radius-sm);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 0.95rem;
        }
        .rank-1 { background: #FFE4E6; color: #E11D48; }
        .rank-2 { background: #FEF3C7; color: #D97706; }
        .rank-3 { background: #E0E7FF; color: #4338CA; }
        .rank-def { background: #F1F5F9; color: #64748B; }

/* roulang page: article */
:root {
            --primary: #1E60F2;
            --primary-hover: #154ac1;
            --accent: #00D2B4;
            --deep-base: #0B1220;
            --light-bg: #F7F9FC;
            --surface: #FFFFFF;
            --text-main: #1E293B;
            --text-muted: #64748B;
            --border-color: rgba(30, 96, 242, 0.08);
            --border-solid: #E4E9F2;
            --radius-sm: 0.375rem;
            --radius-md: 0.75rem;
            --radius-lg: 1.25rem;
            --radius-pill: 9999px;
            --shadow-subtle: 0 4px 20px -2px rgba(11, 18, 32, 0.05);
            --shadow-hover: 0 12px 28px -4px rgba(30, 96, 242, 0.12);
        }
        body {
            font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: var(--light-bg);
            line-height: 1.6;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.25s ease;
        }
        .site-header {
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-solid);
            position: sticky;
            top: 0;
            z-index: 1020;
            box-shadow: 0 2px 10px rgba(11, 18, 32, 0.03);
        }
        .navbar-brand-logo {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--deep-base);
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            letter-spacing: -0.5px;
        }
        .navbar-brand-logo .brand-icon {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--primary), var(--accent));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.25rem;
        }
        .navbar-nav .nav-link {
            font-weight: 500;
            color: #334155;
            padding: 0.5rem 1rem !important;
            position: relative;
            font-size: 0.95rem;
        }
        .navbar-nav .nav-link:hover,
        .navbar-nav .nav-link.active {
            color: var(--primary);
        }
        .navbar-nav .nav-link.active::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 1rem;
            right: 1rem;
            height: 2px;
            background-color: var(--primary);
            border-radius: var(--radius-pill);
        }
        .btn-primary-custom {
            background-color: var(--primary);
            color: #ffffff;
            border: 1px solid var(--primary);
            border-radius: var(--radius-pill);
            padding: 0.65rem 1.6rem;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            box-shadow: 0 4px 14px rgba(30, 96, 242, 0.25);
            transition: all 0.3s ease;
        }
        .btn-primary-custom:hover {
            background-color: var(--primary-hover);
            border-color: var(--primary-hover);
            color: #ffffff;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(30, 96, 242, 0.35);
        }
        .btn-outline-custom {
            border: 1px solid var(--border-solid);
            background: #fff;
            color: var(--deep-base);
            border-radius: var(--radius-pill);
            padding: 0.65rem 1.5rem;
            font-weight: 600;
            transition: all 0.25s ease;
        }
        .btn-outline-custom:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: #F0F5FF;
        }
        
        /* 文章页专用版式与组件 */
        .article-page-wrap {
            padding: 2.5rem 0 5rem 0;
        }
        .article-card {
            background: var(--surface);
            border: 1px solid var(--border-solid);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-subtle);
            overflow: hidden;
        }
        .article-header-box {
            padding: 2.5rem 2.5rem 1.5rem 2.5rem;
            border-bottom: 1px solid var(--border-solid);
        }
        .article-breadcrumb {
            margin-bottom: 1.25rem;
            font-size: 0.875rem;
        }
        .article-breadcrumb a {
            color: var(--text-muted);
        }
        .article-breadcrumb a:hover {
            color: var(--primary);
        }
        .article-category-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
            background: rgba(30, 96, 242, 0.08);
            color: var(--primary);
            padding: 0.25rem 0.75rem;
            border-radius: var(--radius-pill);
            font-size: 0.8125rem;
            font-weight: 600;
        }
        .article-title-h1 {
            font-size: 2.25rem;
            font-weight: 800;
            color: var(--deep-base);
            line-height: 1.35;
            margin: 1.25rem 0;
            letter-spacing: -0.5px;
        }
        .article-meta-row {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 1.25rem;
            color: var(--text-muted);
            font-size: 0.875rem;
            padding-top: 0.75rem;
        }
        .article-meta-item {
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
        }
        .article-lead-box {
            background: #F8FAFC;
            border-left: 4px solid var(--primary);
            padding: 1.25rem 1.5rem;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: #475569;
            font-size: 1.05rem;
            line-height: 1.75;
            margin: 2rem 2.5rem 1rem 2.5rem;
        }
        .article-body-content {
            padding: 2rem 2.5rem;
            font-size: 1.125rem;
            line-height: 1.85;
            color: #334155;
        }
        .article-body-content p {
            margin-bottom: 1.5rem;
        }
        .article-body-content h2 {
            font-size: 1.65rem;
            font-weight: 700;
            color: var(--deep-base);
            margin-top: 2.5rem;
            margin-bottom: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 1px solid var(--border-solid);
        }
        .article-body-content h3 {
            font-size: 1.35rem;
            font-weight: 600;
            color: var(--deep-base);
            margin-top: 2rem;
            margin-bottom: 0.75rem;
        }
        .article-body-content ul, .article-body-content ol {
            margin-bottom: 1.5rem;
            padding-left: 1.75rem;
        }
        .article-body-content li {
            margin-bottom: 0.5rem;
        }
        .article-body-content img {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius-md);
            margin: 1.5rem 0;
        }
        .article-license-box {
            margin: 0 2.5rem 2rem 2.5rem;
            padding: 1.25rem 1.5rem;
            background: #F8FAFC;
            border: 1px dashed #CBD5E1;
            border-radius: var(--radius-md);
            font-size: 0.875rem;
            color: var(--text-muted);
            line-height: 1.7;
        }
        .article-actions-bar {
            padding: 1.5rem 2.5rem;
            background: #FAFCFE;
            border-top: 1px solid var(--border-solid);
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
        }
        .action-chip {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.45rem 1rem;
            border-radius: var(--radius-pill);
            border: 1px solid var(--border-solid);
            background: #fff;
            color: #475569;
            font-size: 0.875rem;
            cursor: pointer;
            transition: all 0.2s ease;
        }
        .action-chip:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: rgba(30, 96, 242, 0.05);
        }
        .post-nav-container {
            margin-top: 2rem;
        }
        .post-nav-card {
            background: var(--surface);
            border: 1px solid var(--border-solid);
            border-radius: var(--radius-md);
            padding: 1.25rem 1.5rem;
            display: block;
            box-shadow: var(--shadow-subtle);
            height: 100%;
        }
        .post-nav-card:hover {
            border-color: var(--primary);
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
        }
        .post-nav-label {
            font-size: 0.8125rem;
            color: var(--text-muted);
            margin-bottom: 0.4rem;
        }
        .post-nav-title {
            font-size: 1rem;
            font-weight: 600;
            color: var(--deep-base);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        
        /* 推荐矩阵 */
        .related-section-title {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--deep-base);
            margin-bottom: 1.5rem;
            position: relative;
            padding-left: 0.75rem;
        }
        .related-section-title::before {
            content: "";
            position: absolute;
            left: 0;
            top: 4px;
            bottom: 4px;
            width: 4px;
            background: var(--primary);
            border-radius: var(--radius-pill);
        }
        .recommend-card {
            background: var(--surface);
            border: 1px solid var(--border-solid);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-subtle);
            display: flex;
            flex-direction: column;
            height: 100%;
            transition: all 0.3s ease;
        }
        .recommend-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(30, 96, 242, 0.3);
        }
        .recommend-img-wrap {
            position: relative;
            background: #E2E8F0;
            overflow: hidden;
            aspect-ratio: 16 / 9;
        }
        .recommend-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .recommend-card:hover .recommend-img-wrap img {
            transform: scale(1.05);
        }
        .recommend-body {
            padding: 1.25rem;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }
        .recommend-title {
            font-size: 1rem;
            font-weight: 600;
            color: var(--deep-base);
            line-height: 1.45;
            margin-bottom: 0.5rem;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .recommend-meta {
            font-size: 0.8125rem;
            color: var(--text-muted);
            margin-top: auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        
        /* 侧边与空态 */
        .empty-article-box {
            text-align: center;
            padding: 5rem 2rem;
            background: #fff;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-solid);
        }
        .empty-icon {
            font-size: 3.5rem;
            color: #94A3B8;
            margin-bottom: 1.25rem;
        }

        /* 页脚 */
        .site-footer {
            background-color: var(--deep-base);
            color: #94A3B8;
            padding: 4.5rem 0 2rem 0;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }
        .footer-heading {
            color: #FFFFFF;
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 1.25rem;
            letter-spacing: -0.2px;
        }
        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-links li {
            margin-bottom: 0.65rem;
        }
        .footer-links a {
            color: #94A3B8;
            font-size: 0.9rem;
        }
        .footer-links a:hover {
            color: var(--accent);
            padding-left: 3px;
        }
        .footer-bottom {
            margin-top: 3.5rem;
            padding-top: 1.75rem;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }

        @media (max-width: 991.98px) {
            .article-header-box {
                padding: 1.5rem 1.5rem 1rem 1.5rem;
            }
            .article-title-h1 {
                font-size: 1.65rem;
            }
            .article-lead-box {
                margin: 1.25rem 1.5rem 0.5rem 1.5rem;
            }
            .article-body-content {
                padding: 1.5rem 1.5rem;
                font-size: 1.05rem;
            }
            .article-license-box,
            .article-actions-bar {
                margin-left: 1.5rem;
                margin-right: 1.5rem;
                padding: 1rem 1.25rem;
            }
        }

/* roulang page: category1 */
:root {
            --primary: #1E60F2;
            --primary-hover: #154ac1;
            --accent: #00D2B4;
            --deep-base: #0B1220;
            --light-bg: #F7F9FC;
            --surface: #FFFFFF;
            --text-main: #1E293B;
            --text-muted: #64748B;
            --border-color: rgba(30, 96, 242, 0.08);
            --border-solid: #E4E9F2;
            --radius-sm: 0.375rem;
            --radius-md: 0.75rem;
            --radius-lg: 1.25rem;
            --radius-pill: 9999px;
            --shadow-subtle: 0 4px 20px -2px rgba(11, 18, 32, 0.05);
            --shadow-hover: 0 12px 28px -4px rgba(30, 96, 242, 0.12);
        }
        body {
            font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: var(--surface);
            line-height: 1.6;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.25s ease;
        }
        .site-header {
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-solid);
            position: sticky;
            top: 0;
            z-index: 1020;
            box-shadow: 0 2px 10px rgba(11, 18, 32, 0.03);
        }
        .navbar-brand-logo {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--deep-base);
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            letter-spacing: -0.5px;
        }
        .navbar-brand-logo .brand-icon {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--primary), var(--accent));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.25rem;
        }
        .navbar-nav .nav-link {
            font-weight: 500;
            color: #334155;
            padding: 0.5rem 1rem !important;
            position: relative;
            font-size: 0.95rem;
        }
        .navbar-nav .nav-link:hover,
        .navbar-nav .nav-link.active {
            color: var(--primary);
        }
        .navbar-nav .nav-link.active::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 1rem;
            right: 1rem;
            height: 2px;
            background-color: var(--primary);
            border-radius: var(--radius-pill);
        }
        .btn-primary-custom {
            background-color: var(--primary);
            color: #ffffff;
            border: 1px solid var(--primary);
            border-radius: var(--radius-pill);
            padding: 0.65rem 1.6rem;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            box-shadow: 0 4px 14px rgba(30, 96, 242, 0.25);
            transition: all 0.3s ease;
        }
        .btn-primary-custom:hover {
            background-color: var(--primary-hover);
            border-color: var(--primary-hover);
            color: #ffffff;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(30, 96, 242, 0.35);
        }
        .btn-outline-custom {
            border: 1px solid var(--border-solid);
            background: #fff;
            color: var(--deep-base);
            border-radius: var(--radius-pill);
            padding: 0.65rem 1.5rem;
            font-weight: 600;
            transition: all 0.25s ease;
        }
        .btn-outline-custom:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: #F0F5FF;
        }
        .section-padding {
            padding: 4.5rem 0;
        }
        @media (max-width: 768px) {
            .section-padding {
                padding: 2.75rem 0;
            }
        }
        .section-header {
            margin-bottom: 2.5rem;
        }
        .section-title {
            font-size: 1.85rem;
            font-weight: 700;
            color: var(--deep-base);
            position: relative;
            padding-bottom: 0.75rem;
            letter-spacing: -0.5px;
        }
        .section-title::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 0;
            width: 36px;
            height: 3px;
            background: var(--primary);
            border-radius: var(--radius-pill);
        }
        .section-header.text-center .section-title::after {
            left: 50%;
            transform: translateX(-50%);
        }
        .section-desc {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-top: 0.5rem;
        }

        /* 紧凑分类标头 + 白皮书留资 Hero */
        .category-hero-section {
            background-color: #F8FAFC;
            border-bottom: 1px solid var(--border-solid);
            padding: 3rem 0;
            position: relative;
        }
        .breadcrumb-nav {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 0.85rem;
        }
        .breadcrumb-nav a {
            color: var(--text-muted);
        }
        .breadcrumb-nav a:hover {
            color: var(--primary);
        }
        .category-h1 {
            font-size: 2.15rem;
            font-weight: 800;
            color: var(--deep-base);
            letter-spacing: -0.5px;
            line-height: 1.25;
            margin-bottom: 0.75rem;
        }
        .category-stat-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            background: #EFF6FF;
            color: var(--primary);
            font-size: 0.85rem;
            font-weight: 600;
            padding: 0.35rem 0.85rem;
            border-radius: var(--radius-pill);
            border: 1px solid rgba(30, 96, 242, 0.15);
        }
        .whitepaper-card {
            background: #ffffff;
            border: 1px solid var(--border-solid);
            border-radius: var(--radius-md);
            padding: 1.5rem;
            box-shadow: var(--shadow-subtle);
        }
        .whitepaper-cover {
            border-radius: var(--radius-sm);
            background: linear-gradient(145deg, #0B1220, #1E3A8A);
            color: #fff;
            padding: 1.5rem;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            min-height: 180px;
        }
        .whitepaper-tag {
            font-size: 0.75rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: var(--accent);
            font-weight: 700;
        }

        /* 检索过滤条 */
        .filter-pill-bar {
            background: #ffffff;
            border-bottom: 1px solid var(--border-solid);
            padding: 1rem 0;
            position: sticky;
            top: 61px;
            z-index: 1010;
        }
        .filter-group-label {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--deep-base);
            margin-right: 0.75rem;
            display: inline-flex;
            align-items: center;
        }
        .filter-pill {
            display: inline-block;
            padding: 0.35rem 0.95rem;
            font-size: 0.85rem;
            border-radius: var(--radius-pill);
            color: #475569;
            background: #F1F5F9;
            border: 1px solid transparent;
            margin: 0.2rem;
            cursor: pointer;
            transition: all 0.2s ease;
        }
        .filter-pill:hover,
        .filter-pill.active {
            background: #EFF6FF;
            color: var(--primary);
            border-color: rgba(30, 96, 242, 0.3);
            font-weight: 600;
        }

        /* 数据卡片矩阵 */
        .media-card {
            background: #ffffff;
            border: 1px solid var(--border-solid);
            border-radius: var(--radius-md);
            overflow: hidden;
            display: flex;
            flex-direction: column;
            height: 100%;
            transition: all 0.3s ease;
            box-shadow: var(--shadow-subtle);
        }
        .media-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(30, 96, 242, 0.2);
        }
        .media-card-imgwrap {
            position: relative;
            background-color: #E2E8F0;
            overflow: hidden;
        }
        .media-card-imgwrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .media-card:hover .media-card-imgwrap img {
            transform: scale(1.04);
        }
        .media-badge-duration {
            position: absolute;
            bottom: 0.5rem;
            right: 0.5rem;
            background: rgba(11, 18, 32, 0.75);
            backdrop-filter: blur(4px);
            color: #ffffff;
            font-size: 0.75rem;
            padding: 0.2rem 0.5rem;
            border-radius: var(--radius-sm);
            font-weight: 500;
        }
        .media-badge-tag {
            position: absolute;
            top: 0.5rem;
            left: 0.5rem;
            background: var(--primary);
            color: #ffffff;
            font-size: 0.75rem;
            padding: 0.2rem 0.6rem;
            border-radius: var(--radius-pill);
            font-weight: 600;
        }
        .media-card-body {
            padding: 1.25rem;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }
        .media-card-title {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--deep-base);
            margin-bottom: 0.5rem;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .media-card:hover .media-card-title {
            color: var(--primary);
        }
        .media-card-desc {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 1rem;
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            flex-grow: 1;
        }
        .media-card-footer {
            border-top: 1px solid #F1F5F9;
            padding-top: 0.75rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.8rem;
            color: #94A3B8;
        }

        /* 榜单组件 */
        .rank-card {
            background: #ffffff;
            border: 1px solid var(--border-solid);
            border-radius: var(--radius-md);
            padding: 1.25rem;
            box-shadow: var(--shadow-subtle);
            height: 100%;
            transition: all 0.25s ease;
        }
        .rank-card:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-hover);
        }
        .rank-badge {
            width: 28px;
            height: 28px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 0.9rem;
            flex-shrink: 0;
        }
        .rank-1 { background: #FEF3C7; color: #D97706; }
        .rank-2 { background: #F1F5F9; color: #475569; }
        .rank-3 { background: #FFEDD5; color: #C2410C; }
        .rank-default { background: #F8FAFC; color: #94A3B8; }

        /* 特色解析 */
        .feature-box {
            background: #ffffff;
            padding: 1.5rem;
            border-radius: var(--radius-md);
            border-left: 3px solid var(--primary);
            box-shadow: var(--shadow-subtle);
            height: 100%;
        }
        .feature-box h4 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--deep-base);
            margin-bottom: 0.6rem;
        }
        .feature-box p {
            font-size: 0.875rem;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 0;
        }

        /* 常见问答 */
        .accordion-item {
            border: 1px solid var(--border-solid);
            border-radius: var(--radius-md) !important;
            margin-bottom: 1rem;
            overflow: hidden;
        }
        .accordion-button {
            font-weight: 600;
            color: var(--deep-base);
            padding: 1.15rem 1.25rem;
            background: #ffffff;
        }
        .accordion-button:not(.collapsed) {
            color: var(--primary);
            background-color: #F0F5FF;
            box-shadow: none;
        }
        .accordion-button:focus {
            box-shadow: none;
            border-color: rgba(30, 96, 242, 0.2);
        }
        .accordion-body {
            color: var(--text-muted);
            font-size: 0.925rem;
            line-height: 1.75;
            background: #ffffff;
        }

        /* 专项交互底栏 */
        .subscribe-bar {
            background: linear-gradient(135deg, var(--deep-base), #152238);
            color: #ffffff;
            border-radius: var(--radius-lg);
            padding: 2.5rem;
        }
        .subscribe-input {
            height: 48px;
            border-radius: var(--radius-pill);
            border: 1px solid rgba(255, 255, 255, 0.2);
            background: rgba(255, 255, 255, 0.08);
            color: #fff;
            padding-left: 1.25rem;
        }
        .subscribe-input::placeholder {
            color: rgba(255, 255, 255, 0.5);
        }
        .subscribe-input:focus {
            background: rgba(255, 255, 255, 0.12);
            border-color: var(--primary);
            color: #fff;
            box-shadow: 0 0 0 0.2rem rgba(30, 96, 242, 0.25);
        }

        /* 页脚 */
        .site-footer {
            background: var(--deep-base);
            color: #94A3B8;
            padding: 4.5rem 0 2rem;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-heading {
            color: #ffffff;
            font-weight: 700;
            font-size: 1rem;
            margin-bottom: 1.25rem;
            letter-spacing: 0.5px;
        }
        .footer-links {
            list-style: none;
            padding-left: 0;
            margin-bottom: 0;
        }
        .footer-links li {
            margin-bottom: 0.65rem;
        }
        .footer-links a {
            color: #94A3B8;
            font-size: 0.9rem;
            transition: color 0.2s ease;
        }
        .footer-links a:hover {
            color: var(--primary);
        }
        .footer-bottom {
            margin-top: 3.5rem;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }