/* roulang page: index */
:root {
            --color-primary: #1a365d;
            --color-primary-light: #264773;
            --color-primary-dark: #0f2340;
            --color-accent: #c9a84c;
            --color-accent-light: #dbbc5a;
            --color-accent-dark: #a88d3a;
            --color-surface: #f7f5f0;
            --color-surface-dark: #ebe7de;
            --color-text-main: #1e293b;
            --color-text-soft: #64748b;
            --color-text-muted: #94a3b8;
            --color-danger: #c53030;
            --color-success: #2f855a;
            --color-border: #e2e0da;
            --color-border-light: #f0ede6;
            --radius-sm: 0.5rem;
            --radius-md: 0.75rem;
            --radius-lg: 0.875rem;
            --radius-xl: 1rem;
            --radius-2xl: 1.25rem;
            --shadow-card: 0 1px 3px rgba(26, 54, 93, 0.06), 0 4px 16px rgba(26, 54, 93, 0.05);
            --shadow-card-hover: 0 2px 8px rgba(26, 54, 93, 0.10), 0 8px 28px rgba(26, 54, 93, 0.08);
            --shadow-nav: 0 1px 0 rgba(26, 54, 93, 0.06), 0 2px 8px rgba(26, 54, 93, 0.03);
            --shadow-btn: 0 2px 4px rgba(26, 54, 93, 0.08);
            --shadow-btn-hover: 0 4px 14px rgba(26, 54, 93, 0.15);
            --transition-fast: 0.15s ease;
            --transition-normal: 0.25s ease;
            --transition-slow: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            margin: 0;
            padding: 0;
            font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            font-size: 16px;
            line-height: 1.7;
            color: var(--color-text-main);
            background-color: #fafaf8;
            min-height: 100vh;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--color-accent);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button {
            cursor: pointer;
            font-family: inherit;
        }
        input {
            font-family: inherit;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
        }
        @media (max-width: 640px) {
            .container {
                padding-left: 1rem;
                padding-right: 1rem;
            }
        }

        /* Header & Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--color-border-light);
            box-shadow: var(--shadow-nav);
            transition: all var(--transition-normal);
        }
        .site-header.scrolled {
            box-shadow: 0 2px 6px rgba(26, 54, 93, 0.08), 0 8px 20px rgba(26, 54, 93, 0.04);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
            gap: 1.5rem;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-weight: 700;
            font-size: 1.35rem;
            color: var(--color-primary);
            letter-spacing: 0.02em;
            white-space: nowrap;
            flex-shrink: 0;
        }
        .nav-logo .logo-icon {
            width: 36px;
            height: 36px;
            border-radius: var(--radius-md);
            background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.1rem;
            font-weight: 800;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 0.25rem;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .nav-links a {
            display: inline-flex;
            align-items: center;
            padding: 0.5rem 1rem;
            border-radius: var(--radius-md);
            font-size: 0.925rem;
            font-weight: 500;
            color: var(--color-text-soft);
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
        }
        .nav-links a:hover {
            color: var(--color-primary);
            background: rgba(26, 54, 93, 0.04);
        }
        .nav-links a.active {
            color: var(--color-primary);
            font-weight: 600;
            background: rgba(26, 54, 93, 0.06);
        }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            flex-shrink: 0;
        }
        .nav-search {
            position: relative;
            display: flex;
            align-items: center;
        }
        .nav-search input {
            width: 200px;
            height: 38px;
            padding: 0 2.5rem 0 1rem;
            border: 1.5px solid var(--color-border);
            border-radius: 2rem;
            font-size: 0.875rem;
            color: var(--color-text-main);
            background: var(--color-surface);
            outline: none;
            transition: all var(--transition-normal);
        }
        .nav-search input:focus {
            border-color: var(--color-accent);
            background: #fff;
            box-shadow: 0 0 0 3px rgba(201, 168, 76, 0.10);
            width: 240px;
        }
        .nav-search .search-icon {
            position: absolute;
            right: 0.85rem;
            color: var(--color-text-muted);
            pointer-events: none;
            font-size: 0.9rem;
        }
        .btn-nav-cta {
            display: inline-flex;
            align-items: center;
            padding: 0.5rem 1.35rem;
            border-radius: 2rem;
            font-size: 0.875rem;
            font-weight: 600;
            background: var(--color-accent);
            color: #fff;
            border: none;
            transition: all var(--transition-normal);
            box-shadow: var(--shadow-btn);
            white-space: nowrap;
        }
        .btn-nav-cta:hover {
            background: var(--color-accent-light);
            box-shadow: var(--shadow-btn-hover);
            transform: translateY(-1px);
            color: #fff;
        }
        .mobile-menu-toggle {
            display: none;
            background: none;
            border: none;
            padding: 0.5rem;
            cursor: pointer;
            color: var(--color-text-main);
            font-size: 1.5rem;
            line-height: 1;
        }
        @media (max-width: 1024px) {
            .nav-links {
                gap: 0;
            }
            .nav-links a {
                padding: 0.4rem 0.7rem;
                font-size: 0.85rem;
            }
            .nav-search input {
                width: 150px;
            }
            .nav-search input:focus {
                width: 180px;
            }
        }
        @media (max-width: 768px) {
            .nav-links,
            .nav-search {
                display: none;
            }
            .nav-links.open {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: 64px;
                left: 0;
                right: 0;
                background: #fff;
                border-bottom: 1px solid var(--color-border-light);
                padding: 1rem 1.5rem;
                gap: 0.5rem;
                box-shadow: 0 8px 24px rgba(26, 54, 93, 0.10);
                z-index: 99;
            }
            .nav-links.open a {
                padding: 0.6rem 1rem;
                border-radius: var(--radius-md);
                font-size: 0.95rem;
            }
            .nav-search.open {
                display: flex;
                position: absolute;
                top: calc(64px + 140px);
                left: 0;
                right: 0;
                padding: 0.75rem 1.5rem;
                background: #fff;
                border-bottom: 1px solid var(--color-border-light);
                box-shadow: 0 4px 12px rgba(26, 54, 93, 0.06);
                z-index: 98;
            }
            .nav-search.open input {
                width: 100%;
            }
            .mobile-menu-toggle {
                display: block;
            }
            .btn-nav-cta {
                padding: 0.4rem 1rem;
                font-size: 0.8rem;
            }
        }

        /* Hero */
        .hero-section {
            position: relative;
            background: linear-gradient(160deg, #1a365d 0%, #1e4d7a 35%, #1a365d 70%, #0f2340 100%);
            color: #fff;
            padding: 5rem 0 6rem;
            overflow: hidden;
            min-height: 520px;
            display: flex;
            align-items: center;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            opacity: 0.18;
            z-index: 0;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 0;
            right: 0;
            height: 80px;
            background: linear-gradient(to top, #fafaf8, transparent);
            z-index: 1;
        }
        .hero-inner {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
            align-items: center;
        }
        .hero-content {
            max-width: 560px;
        }
        .hero-badge {
            display: inline-block;
            padding: 0.35rem 0.9rem;
            background: rgba(255, 255, 255, 0.13);
            border: 1px solid rgba(255, 255, 255, 0.22);
            border-radius: 2rem;
            font-size: 0.85rem;
            font-weight: 500;
            letter-spacing: 0.03em;
            color: #f0e6c8;
            margin-bottom: 1.25rem;
        }
        .hero-title {
            font-size: 2.9rem;
            font-weight: 800;
            line-height: 1.2;
            margin: 0 0 1.25rem;
            letter-spacing: -0.01em;
        }
        .hero-title .highlight {
            color: #e8c95a;
        }
        .hero-desc {
            font-size: 1.125rem;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.82);
            margin: 0 0 2rem;
            max-width: 480px;
        }
        .hero-buttons {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
        }
        .btn-hero-primary {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.8rem 1.8rem;
            border-radius: 2.5rem;
            font-size: 1rem;
            font-weight: 600;
            background: var(--color-accent);
            color: #1a365d;
            border: none;
            transition: all var(--transition-normal);
            box-shadow: 0 4px 18px rgba(201, 168, 76, 0.35);
        }
        .btn-hero-primary:hover {
            background: #e8c95a;
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(201, 168, 76, 0.45);
            color: #1a365d;
        }
        .btn-hero-secondary {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.8rem 1.8rem;
            border-radius: 2.5rem;
            font-size: 1rem;
            font-weight: 500;
            background: transparent;
            color: #fff;
            border: 1.5px solid rgba(255, 255, 255, 0.45);
            transition: all var(--transition-normal);
        }
        .btn-hero-secondary:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(255, 255, 255, 0.7);
            color: #fff;
        }
        .hero-visual {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .hero-stats-card {
            background: rgba(255, 255, 255, 0.07);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.18);
            border-radius: var(--radius-2xl);
            padding: 2rem 2.5rem;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem;
        }
        .hero-stat-item {
            text-align: center;
        }
        .hero-stat-number {
            font-size: 2.2rem;
            font-weight: 800;
            color: #e8c95a;
            line-height: 1;
            margin-bottom: 0.35rem;
        }
        .hero-stat-label {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.7);
            font-weight: 400;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 3rem 0 4rem;
                min-height: auto;
            }
            .hero-inner {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            .hero-title {
                font-size: 2rem;
            }
            .hero-desc {
                font-size: 1rem;
            }
            .hero-stats-card {
                padding: 1.5rem;
                gap: 1rem;
            }
            .hero-stat-number {
                font-size: 1.6rem;
            }
            .btn-hero-primary,
            .btn-hero-secondary {
                padding: 0.65rem 1.4rem;
                font-size: 0.9rem;
            }
        }

        /* Sections */
        .section {
            padding: 4.5rem 0;
        }
        .section-header {
            text-align: center;
            margin-bottom: 3rem;
        }
        .section-label {
            display: inline-block;
            padding: 0.3rem 0.85rem;
            background: rgba(201, 168, 76, 0.10);
            color: var(--color-accent-dark);
            border-radius: 2rem;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.04em;
            margin-bottom: 0.75rem;
        }
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            color: var(--color-text-main);
            margin: 0 0 0.75rem;
            letter-spacing: -0.01em;
        }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--color-text-soft);
            max-width: 560px;
            margin: 0 auto;
            line-height: 1.7;
        }

        /* Service Cards */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
        }
        .service-card {
            background: #fff;
            border: 1px solid var(--color-border-light);
            border-radius: var(--radius-xl);
            padding: 2rem 1.75rem;
            transition: all var(--transition-normal);
            position: relative;
            overflow: hidden;
        }
        .service-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
            opacity: 0;
            transition: opacity var(--transition-normal);
        }
        .service-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: transparent;
        }
        .service-card:hover::before {
            opacity: 1;
        }
        .service-card-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-lg);
            background: rgba(26, 54, 93, 0.06);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            margin-bottom: 1.25rem;
            color: var(--color-primary);
        }
        .service-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin: 0 0 0.6rem;
            color: var(--color-text-main);
        }
        .service-card p {
            font-size: 0.925rem;
            color: var(--color-text-soft);
            margin: 0;
            line-height: 1.7;
        }
        @media (max-width: 768px) {
            .services-grid {
                grid-template-columns: 1fr;
                gap: 1rem;
            }
            .service-card {
                padding: 1.5rem;
            }
        }

        /* Category Card */
        .category-card-large {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            background: #fff;
            border-radius: var(--radius-2xl);
            overflow: hidden;
            border: 1px solid var(--color-border-light);
            box-shadow: var(--shadow-card);
            transition: all var(--transition-normal);
        }
        .category-card-large:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }
        .category-card-img {
            position: relative;
            min-height: 280px;
            overflow: hidden;
        }
        .category-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }
        .category-card-large:hover .category-card-img img {
            transform: scale(1.04);
        }
        .category-card-body {
            padding: 2.5rem 2rem;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        .category-card-body .card-tag {
            display: inline-block;
            padding: 0.25rem 0.75rem;
            background: rgba(201, 168, 76, 0.14);
            color: var(--color-accent-dark);
            border-radius: 2rem;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.03em;
            margin-bottom: 1rem;
            width: fit-content;
        }
        .category-card-body h3 {
            font-size: 1.5rem;
            font-weight: 700;
            margin: 0 0 0.75rem;
            color: var(--color-text-main);
        }
        .category-card-body p {
            font-size: 0.95rem;
            color: var(--color-text-soft);
            margin: 0 0 1.5rem;
            line-height: 1.7;
        }
        .btn-outline-accent {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.6rem 1.4rem;
            border-radius: 2rem;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--color-accent-dark);
            border: 1.5px solid var(--color-accent);
            background: transparent;
            transition: all var(--transition-normal);
            width: fit-content;
        }
        .btn-outline-accent:hover {
            background: var(--color-accent);
            color: #fff;
        }
        @media (max-width: 768px) {
            .category-card-large {
                grid-template-columns: 1fr;
            }
            .category-card-img {
                min-height: 200px;
            }
            .category-card-body {
                padding: 1.5rem;
            }
        }

        /* News List */
        .news-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
        }
        .news-card {
            background: #fff;
            border-radius: var(--radius-xl);
            overflow: hidden;
            border: 1px solid var(--color-border-light);
            box-shadow: var(--shadow-card);
            transition: all var(--transition-normal);
            display: flex;
            flex-direction: column;
        }
        .news-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
        }
        .news-card-img {
            position: relative;
            height: 180px;
            overflow: hidden;
            background: var(--color-surface);
        }
        .news-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }
        .news-card:hover .news-card-img img {
            transform: scale(1.05);
        }
        .news-card-body {
            padding: 1.35rem 1.25rem;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .news-card-meta {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            margin-bottom: 0.6rem;
            flex-wrap: wrap;
        }
        .news-card-category {
            font-size: 0.75rem;
            font-weight: 600;
            padding: 0.2rem 0.6rem;
            border-radius: 2rem;
            background: rgba(26, 54, 93, 0.07);
            color: var(--color-primary);
            letter-spacing: 0.03em;
        }
        .news-card-date {
            font-size: 0.78rem;
            color: var(--color-text-muted);
        }
        .news-card-title {
            font-size: 1.05rem;
            font-weight: 700;
            margin: 0 0 0.5rem;
            line-height: 1.45;
            color: var(--color-text-main);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-card-title a {
            color: inherit;
        }
        .news-card-title a:hover {
            color: var(--color-accent-dark);
        }
        .news-card-excerpt {
            font-size: 0.875rem;
            color: var(--color-text-soft);
            line-height: 1.6;
            margin: 0;
            flex: 1;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 3rem 1rem;
            color: var(--color-text-soft);
            font-size: 1rem;
            background: #fff;
            border-radius: var(--radius-xl);
            border: 1px dashed var(--color-border);
        }
        @media (max-width: 1024px) {
            .news-list {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 640px) {
            .news-list {
                grid-template-columns: 1fr;
            }
            .news-card-img {
                height: 200px;
            }
        }

        /* Stats / Process */
        .stats-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
        }
        .stat-block {
            text-align: center;
            padding: 2rem 1rem;
            background: #fff;
            border-radius: var(--radius-xl);
            border: 1px solid var(--color-border-light);
            transition: all var(--transition-normal);
        }
        .stat-block:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }
        .stat-number-large {
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--color-primary);
            line-height: 1;
            margin-bottom: 0.4rem;
        }
        .stat-unit {
            font-size: 1rem;
            font-weight: 500;
            color: var(--color-accent-dark);
        }
        .stat-label-text {
            font-size: 0.9rem;
            color: var(--color-text-soft);
            font-weight: 500;
        }
        @media (max-width: 768px) {
            .stats-row {
                grid-template-columns: repeat(2, 1fr);
                gap: 1rem;
            }
            .stat-number-large {
                font-size: 2rem;
            }
        }
        @media (max-width: 480px) {
            .stats-row {
                grid-template-columns: 1fr 1fr;
                gap: 0.75rem;
            }
            .stat-block {
                padding: 1.25rem 0.75rem;
            }
        }

        /* FAQ */
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }
        .faq-item {
            background: #fff;
            border: 1px solid var(--color-border-light);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition-normal);
        }
        .faq-item:hover {
            border-color: var(--color-border);
        }
        .faq-question {
            width: 100%;
            text-align: left;
            padding: 1.2rem 1.5rem;
            background: none;
            border: none;
            font-size: 1rem;
            font-weight: 600;
            color: var(--color-text-main);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            line-height: 1.5;
            transition: all var(--transition-fast);
        }
        .faq-question:hover {
            color: var(--color-primary);
        }
        .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: rgba(26, 54, 93, 0.06);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.8rem;
            transition: all var(--transition-normal);
            color: var(--color-primary);
        }
        .faq-item.open .faq-icon {
            transform: rotate(45deg);
            background: var(--color-accent);
            color: #fff;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow), padding var(--transition-normal);
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
        }
        .faq-answer-inner {
            padding: 0 1.5rem 1.3rem;
            font-size: 0.925rem;
            color: var(--color-text-soft);
            line-height: 1.75;
        }

        /* CTA */
        .cta-section {
            background: linear-gradient(150deg, #1a365d 0%, #1e4d7a 50%, #1a365d 100%);
            color: #fff;
            text-align: center;
            padding: 4rem 0;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            opacity: 0.12;
            z-index: 0;
        }
        .cta-inner {
            position: relative;
            z-index: 1;
        }
        .cta-title {
            font-size: 2rem;
            font-weight: 700;
            margin: 0 0 1rem;
            letter-spacing: -0.01em;
        }
        .cta-desc {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.78);
            margin: 0 auto 2rem;
            max-width: 500px;
            line-height: 1.7;
        }
        .btn-cta-large {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.9rem 2.2rem;
            border-radius: 2.5rem;
            font-size: 1.05rem;
            font-weight: 700;
            background: #e8c95a;
            color: #1a365d;
            border: none;
            transition: all var(--transition-normal);
            box-shadow: 0 6px 24px rgba(201, 168, 76, 0.40);
        }
        .btn-cta-large:hover {
            background: #f0d66b;
            transform: translateY(-2px);
            box-shadow: 0 10px 32px rgba(201, 168, 76, 0.50);
            color: #1a365d;
        }

        /* Footer */
        .site-footer {
            background: #1a1f28;
            color: rgba(255, 255, 255, 0.7);
            padding: 3rem 0 2rem;
            font-size: 0.9rem;
        }
        .footer-inner {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-brand {
            max-width: 280px;
        }
        .footer-brand .brand-name {
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 0.5rem;
        }
        .footer-brand p {
            color: rgba(255, 255, 255, 0.5);
            line-height: 1.7;
            margin: 0;
            font-size: 0.85rem;
        }
        .footer-links-group h4 {
            font-size: 0.9rem;
            font-weight: 600;
            color: #fff;
            margin: 0 0 0.75rem;
            letter-spacing: 0.03em;
        }
        .footer-links-group ul {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 0.4rem;
        }
        .footer-links-group a {
            color: rgba(255, 255, 255, 0.5);
            font-size: 0.85rem;
            transition: color var(--transition-fast);
        }
        .footer-links-group a:hover {
            color: var(--color-accent-light);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 1.5rem;
            text-align: center;
            color: rgba(255, 255, 255, 0.4);
            font-size: 0.8rem;
        }
        @media (max-width: 640px) {
            .footer-inner {
                flex-direction: column;
                gap: 1.5rem;
            }
            .footer-brand {
                max-width: 100%;
            }
        }

        /* Misc */
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border-width: 0;
        }
        .divider {
            width: 60px;
            height: 3px;
            background: var(--color-accent);
            border-radius: 2px;
            margin: 1.5rem auto;
        }
        .bg-surface {
            background-color: var(--color-surface);
        }

/* roulang page: category1 */
/* ========== 设计变量 ========== */
        :root {
            --primary: #1a56db;
            --primary-dark: #1040b0;
            --primary-light: #e8effd;
            --primary-soft: #f5f8ff;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --accent-light: #fef3c7;
            --bg: #ffffff;
            --bg-alt: #f9fafb;
            --bg-dark: #111827;
            --bg-card: #ffffff;
            --text: #1f2937;
            --text-secondary: #6b7280;
            --text-light: #9ca3af;
            --text-inverse: #ffffff;
            --border: #e5e7eb;
            --border-light: #f3f4f6;
            --radius-sm: 6px;
            --radius: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
            --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
            --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
            --shadow-lg: 0 10px 25px rgba(0,0,0,0.08), 0 4px 10px rgba(0,0,0,0.05);
            --shadow-xl: 0 20px 40px rgba(0,0,0,0.10), 0 8px 16px rgba(0,0,0,0.06);
            --transition: 0.2s ease;
            --transition-slow: 0.35s ease;
            --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
            --max-width: 1200px;
            --header-height: 68px;
        }

        /* ========== Reset & Base ========== */
        *, *::before, *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
        }
        ul, ol {
            list-style: none;
        }
        h1, h2, h3, h4, h5, h6 {
            line-height: 1.3;
            color: var(--text);
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ========== Header / Nav (SaaS命令栏风格) ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255,255,255,0.95);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
            height: var(--header-height);
            display: flex;
            align-items: center;
            box-shadow: var(--shadow-sm);
            transition: box-shadow var(--transition);
        }
        .site-header.scrolled {
            box-shadow: var(--shadow-md);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
        }
        .logo-area {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .logo-icon {
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, var(--primary), #3b82f6);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 700;
            font-size: 18px;
        }
        .logo-text {
            font-size: 18px;
            font-weight: 700;
            color: var(--text);
            letter-spacing: -0.3px;
            white-space: nowrap;
        }
        .logo-text a {
            color: inherit;
        }
        .logo-text a:hover {
            color: var(--primary);
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 4px;
            list-style: none;
        }
        .nav-links a {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            border-radius: var(--radius);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
            white-space: nowrap;
            position: relative;
        }
        .nav-links a:hover {
            color: var(--text);
            background: var(--bg-alt);
        }
        .nav-links a.active {
            color: var(--primary);
            background: var(--primary-soft);
            font-weight: 600;
        }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .search-box {
            display: flex;
            align-items: center;
            gap: 8px;
            background: var(--bg-alt);
            border: 1px solid var(--border);
            border-radius: 24px;
            padding: 8px 16px;
            transition: all var(--transition);
            cursor: text;
        }
        .search-box:hover {
            border-color: #d1d5db;
            box-shadow: var(--shadow-sm);
        }
        .search-box:focus-within {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(26,86,219,0.1);
            background: #fff;
        }
        .search-box input {
            border: none;
            outline: none;
            background: transparent;
            font-size: 14px;
            width: 160px;
            color: var(--text);
        }
        .search-box input::placeholder {
            color: var(--text-light);
        }
        .search-icon {
            color: var(--text-light);
            font-size: 15px;
        }
        .btn-nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 9px 18px;
            background: var(--primary);
            color: #fff;
            border-radius: 24px;
            font-size: 14px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            white-space: nowrap;
        }
        .btn-nav-cta:hover {
            background: var(--primary-dark);
            color: #fff;
            box-shadow: var(--shadow-md);
            transform: translateY(-1px);
        }
        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
            color: var(--text);
            font-size: 22px;
            line-height: 1;
        }
        @media (max-width: 900px) {
            .nav-links {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: #fff;
                flex-direction: column;
                align-items: stretch;
                padding: 12px 16px;
                gap: 2px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-lg);
                display: none;
                z-index: 999;
            }
            .nav-links.open {
                display: flex;
            }
            .nav-links a {
                padding: 12px 16px;
                border-radius: var(--radius);
                font-size: 15px;
            }
            .mobile-toggle {
                display: block;
            }
            .search-box {
                display: none;
            }
        }
        @media (max-width: 520px) {
            .header-inner {
                padding: 0 12px;
            }
            .logo-text {
                font-size: 16px;
            }
            .btn-nav-cta {
                padding: 7px 14px;
                font-size: 13px;
            }
            .header-actions {
                gap: 6px;
            }
        }

        /* ========== 分类页 Banner ========== */
        .category-banner {
            position: relative;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            padding: 70px 0;
            color: #fff;
            overflow: hidden;
        }
        .category-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(17,24,39,0.88) 0%, rgba(17,24,39,0.65) 50%, rgba(26,86,219,0.55) 100%);
            z-index: 1;
        }
        .category-banner .container {
            position: relative;
            z-index: 2;
        }
        .banner-breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: rgba(255,255,255,0.8);
            margin-bottom: 16px;
            flex-wrap: wrap;
        }
        .banner-breadcrumb a {
            color: rgba(255,255,255,0.85);
        }
        .banner-breadcrumb a:hover {
            color: #fff;
        }
        .banner-breadcrumb .separator {
            color: rgba(255,255,255,0.5);
        }
        .banner-breadcrumb .current {
            color: #fff;
            font-weight: 500;
        }
        .category-banner h1 {
            font-size: 38px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: -0.5px;
        }
        .category-banner .banner-subtitle {
            font-size: 17px;
            color: rgba(255,255,255,0.85);
            max-width: 600px;
            line-height: 1.6;
        }
        .banner-stats {
            display: flex;
            gap: 40px;
            margin-top: 28px;
            flex-wrap: wrap;
        }
        .banner-stat-item {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .banner-stat-value {
            font-size: 28px;
            font-weight: 700;
            color: #fff;
        }
        .banner-stat-label {
            font-size: 13px;
            color: rgba(255,255,255,0.7);
        }
        @media (max-width: 768px) {
            .category-banner {
                padding: 48px 0;
            }
            .category-banner h1 {
                font-size: 28px;
            }
            .category-banner .banner-subtitle {
                font-size: 15px;
            }
            .banner-stats {
                gap: 24px;
            }
            .banner-stat-value {
                font-size: 22px;
            }
        }
        @media (max-width: 520px) {
            .category-banner h1 {
                font-size: 24px;
            }
            .banner-stats {
                gap: 18px;
            }
        }

        /* ========== 主体布局 ========== */
        .category-main {
            display: grid;
            grid-template-columns: 1fr 340px;
            gap: 40px;
            padding: 48px 0;
        }
        .category-content {
            min-width: 0;
        }
        .category-sidebar {
            position: sticky;
            top: calc(var(--header-height) + 24px);
            align-self: start;
        }
        @media (max-width: 1024px) {
            .category-main {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .category-sidebar {
                position: static;
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
        }
        @media (max-width: 600px) {
            .category-sidebar {
                grid-template-columns: 1fr;
            }
            .category-main {
                padding: 32px 0;
                gap: 24px;
            }
        }

        /* ========== 筛选标签栏 ========== */
        .filter-bar {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
            margin-bottom: 28px;
            padding-bottom: 20px;
            border-bottom: 1px solid var(--border);
        }
        .filter-tag {
            display: inline-flex;
            align-items: center;
            padding: 7px 15px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 500;
            cursor: pointer;
            transition: all var(--transition);
            background: var(--bg-alt);
            color: var(--text-secondary);
            border: 1px solid transparent;
            user-select: none;
            white-space: nowrap;
        }
        .filter-tag:hover {
            background: var(--border-light);
            color: var(--text);
        }
        .filter-tag.active {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            font-weight: 600;
        }
        .filter-tag .count {
            margin-left: 5px;
            font-size: 11px;
            opacity: 0.75;
        }
        @media (max-width: 520px) {
            .filter-bar {
                gap: 6px;
            }
            .filter-tag {
                padding: 5px 12px;
                font-size: 12px;
            }
        }

        /* ========== 文章卡片列表 ========== */
        .article-list {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .article-card {
            display: flex;
            gap: 20px;
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition);
            cursor: pointer;
        }
        .article-card:hover {
            box-shadow: var(--shadow-lg);
            border-color: #d1d5db;
            transform: translateY(-2px);
        }
        .article-card-image {
            flex-shrink: 0;
            width: 240px;
            min-height: 160px;
            position: relative;
            overflow: hidden;
        }
        .article-card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }
        .article-card:hover .article-card-image img {
            transform: scale(1.05);
        }
        .article-card-badge {
            position: absolute;
            top: 12px;
            left: 12px;
            background: var(--accent);
            color: #fff;
            font-size: 11px;
            font-weight: 600;
            padding: 4px 10px;
            border-radius: 4px;
            z-index: 2;
        }
        .article-card-body {
            flex: 1;
            padding: 18px 20px 18px 0;
            display: flex;
            flex-direction: column;
            justify-content: center;
            min-width: 0;
        }
        .article-card-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 12px;
            color: var(--text-light);
            margin-bottom: 8px;
            flex-wrap: wrap;
        }
        .article-card-meta .meta-dot {
            width: 4px;
            height: 4px;
            border-radius: 50%;
            background: var(--text-light);
        }
        .article-card-title {
            font-size: 18px;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 8px;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .article-card-title a {
            color: inherit;
        }
        .article-card-title a:hover {
            color: var(--primary);
        }
        .article-card-excerpt {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 10px;
        }
        .article-card-tags {
            display: flex;
            gap: 6px;
            flex-wrap: wrap;
        }
        .article-card-tag {
            font-size: 11px;
            padding: 3px 10px;
            border-radius: 12px;
            background: var(--primary-soft);
            color: var(--primary);
            font-weight: 500;
        }
        @media (max-width: 768px) {
            .article-card {
                flex-direction: column;
            }
            .article-card-image {
                width: 100%;
                min-height: 180px;
                max-height: 220px;
            }
            .article-card-body {
                padding: 16px;
            }
            .article-card-title {
                font-size: 16px;
            }
        }

        /* ========== 侧边栏 ========== */
        .sidebar-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 24px;
            margin-bottom: 24px;
        }
        .sidebar-card h3 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 16px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--primary-soft);
            color: var(--text);
        }
        .sidebar-article-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .sidebar-article-item {
            display: flex;
            gap: 12px;
            align-items: flex-start;
        }
        .sidebar-article-thumb {
            width: 64px;
            height: 48px;
            border-radius: var(--radius-sm);
            overflow: hidden;
            flex-shrink: 0;
            background: var(--bg-alt);
        }
        .sidebar-article-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .sidebar-article-info {
            flex: 1;
            min-width: 0;
        }
        .sidebar-article-info .title {
            font-size: 13px;
            font-weight: 500;
            color: var(--text);
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .sidebar-article-info .title a {
            color: inherit;
        }
        .sidebar-article-info .title a:hover {
            color: var(--primary);
        }
        .sidebar-article-info .date {
            font-size: 11px;
            color: var(--text-light);
            margin-top: 4px;
        }
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .tag-cloud a {
            display: inline-block;
            padding: 6px 14px;
            background: var(--bg-alt);
            border-radius: 20px;
            font-size: 13px;
            color: var(--text-secondary);
            transition: all var(--transition);
        }
        .tag-cloud a:hover {
            background: var(--primary-soft);
            color: var(--primary);
            font-weight: 500;
        }

        /* ========== 分页 ========== */
        .pagination {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 4px;
            margin-top: 36px;
            flex-wrap: wrap;
        }
        .pagination a, .pagination span {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: var(--radius);
            font-size: 14px;
            font-weight: 500;
            transition: all var(--transition);
            border: 1px solid var(--border);
            color: var(--text-secondary);
            background: #fff;
        }
        .pagination a:hover {
            background: var(--primary-soft);
            color: var(--primary);
            border-color: var(--primary-light);
        }
        .pagination .current {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            font-weight: 600;
        }
        .pagination .disabled {
            opacity: 0.4;
            pointer-events: none;
        }

        /* ========== FAQ 板块 ========== */
        .section-faq {
            padding: 60px 0;
            background: var(--bg-alt);
            border-top: 1px solid var(--border);
        }
        .section-faq .section-title {
            text-align: center;
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text);
        }
        .section-faq .section-subtitle {
            text-align: center;
            font-size: 15px;
            color: var(--text-secondary);
            margin-bottom: 40px;
        }
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            width: 100%;
            text-align: left;
            padding: 18px 20px;
            font-size: 15px;
            font-weight: 600;
            color: var(--text);
            background: none;
            border: none;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            transition: color var(--transition);
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-icon {
            flex-shrink: 0;
            width: 22px;
            height: 22px;
            border-radius: 50%;
            background: var(--bg-alt);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            transition: all var(--transition);
            color: var(--text-secondary);
        }
        .faq-item.open .faq-icon {
            background: var(--primary);
            color: #fff;
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow), padding var(--transition-slow);
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
        }
        .faq-answer-inner {
            padding: 0 20px 18px;
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        @media (max-width: 768px) {
            .section-faq {
                padding: 40px 0;
            }
            .section-faq .section-title {
                font-size: 24px;
            }
            .faq-question {
                font-size: 14px;
                padding: 15px 16px;
            }
            .faq-answer-inner {
                padding: 0 16px 15px;
                font-size: 13px;
            }
        }

        /* ========== CTA 板块 ========== */
        .section-cta {
            padding: 60px 0;
            background: linear-gradient(135deg, var(--primary) 0%, #1e40af 100%);
            color: #fff;
            text-align: center;
        }
        .section-cta .cta-title {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 12px;
            color: #fff;
        }
        .section-cta .cta-text {
            font-size: 16px;
            color: rgba(255,255,255,0.85);
            margin-bottom: 28px;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
            line-height: 1.6;
        }
        .btn-cta-large {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            background: #fff;
            color: var(--primary);
            border-radius: 28px;
            font-size: 16px;
            font-weight: 700;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            box-shadow: var(--shadow-lg);
        }
        .btn-cta-large:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-xl);
            background: #f9fafb;
        }
        @media (max-width: 768px) {
            .section-cta {
                padding: 40px 0;
            }
            .section-cta .cta-title {
                font-size: 24px;
            }
            .btn-cta-large {
                padding: 12px 26px;
                font-size: 15px;
            }
        }

        /* ========== Footer ========== */
        .site-footer {
            background: var(--bg-dark);
            color: #d1d5db;
            padding: 48px 0 24px;
            margin-top: auto;
        }
        .footer-inner {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 36px;
        }
        .footer-brand .brand-name {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }
        .footer-brand p {
            font-size: 14px;
            color: #9ca3af;
            line-height: 1.6;
        }
        .footer-links-group h4 {
            font-size: 15px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 14px;
        }
        .footer-links-group ul {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer-links-group a {
            font-size: 14px;
            color: #9ca3af;
            transition: color var(--transition);
        }
        .footer-links-group a:hover {
            color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid #374151;
            padding-top: 20px;
            text-align: center;
            font-size: 13px;
            color: #6b7280;
        }
        @media (max-width: 768px) {
            .footer-inner {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 520px) {
            .footer-inner {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .site-footer {
                padding: 36px 0 20px;
            }
        }

        /* ========== 通用工具 ========== */
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0,0,0,0);
            white-space: nowrap;
            border: 0;
        }

/* roulang page: article */
:root {
            --primary: #1e40af;
            --primary-light: #3b82f6;
            --primary-dark: #1a3591;
            --accent: #f59e0b;
            --accent-light: #fbbf24;
            --accent-dark: #d97706;
            --bg: #f8fafc;
            --bg-white: #ffffff;
            --bg-soft: #f1f5f9;
            --text: #1e293b;
            --text-soft: #475569;
            --text-muted: #94a3b8;
            --text-light: #64748b;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.10), 0 4px 8px rgba(0, 0, 0, 0.05);
            --shadow-xl: 0 20px 48px rgba(0, 0, 0, 0.12), 0 6px 12px rgba(0, 0, 0, 0.06);
            --radius-xs: 4px;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --radius-2xl: 24px;
            --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', -apple-system, BlinkMacSystemFont, sans-serif;
            --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', 'Consolas', monospace;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            text-rendering: optimizeLegibility;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background-color: var(--bg);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

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

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

        button,
        input {
            font-family: inherit;
            font-size: inherit;
            outline: none;
            border: none;
        }

        button {
            cursor: pointer;
        }

        ul,
        ol {
            list-style: none;
        }

        .container {
            width: 100%;
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 24px;
        }

        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ========== HEADER / NAV ========== */
        .site-header {
            background: var(--bg-white);
            border-bottom: 1px solid var(--border-light);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: var(--shadow-xs);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            background: rgba(255, 255, 255, 0.95);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
            gap: 24px;
        }

        .logo-area {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 700;
            font-size: 18px;
            letter-spacing: -0.5px;
        }

        .logo-text {
            font-size: 18px;
            font-weight: 700;
            color: var(--text);
            letter-spacing: -0.3px;
            white-space: nowrap;
        }

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

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

        .nav-links li a {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 500;
            color: var(--text-soft);
            transition: all 0.2s ease;
            white-space: nowrap;
        }

        .nav-links li a:hover {
            color: var(--primary);
            background: rgba(30, 64, 175, 0.04);
        }

        .nav-links li a.active {
            color: var(--primary);
            background: rgba(30, 64, 175, 0.08);
            font-weight: 600;
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .search-box {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 9px 14px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            background: var(--bg-soft);
            font-size: 13px;
            color: var(--text-soft);
            transition: all 0.25s ease;
            cursor: pointer;
            min-width: 180px;
        }

        .search-box:hover {
            border-color: var(--primary-light);
            background: var(--bg-white);
            box-shadow: var(--shadow-xs);
        }

        .search-box i {
            color: var(--text-muted);
            font-size: 14px;
        }

        .search-box span {
            color: var(--text-muted);
        }

        .btn-header-cta {
            padding: 10px 20px;
            border-radius: var(--radius-sm);
            font-size: 13px;
            font-weight: 600;
            background: var(--primary);
            color: #fff;
            transition: all 0.25s ease;
            white-space: nowrap;
            letter-spacing: 0.2px;
        }

        .btn-header-cta:hover {
            background: var(--primary-dark);
            box-shadow: var(--shadow-md);
            transform: translateY(-1px);
        }

        .btn-header-cta:active {
            transform: translateY(0);
            box-shadow: var(--shadow-xs);
        }

        .mobile-menu-toggle {
            display: none;
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            background: var(--bg-soft);
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: var(--text-soft);
            transition: all 0.2s ease;
            border: 1px solid var(--border);
        }

        .mobile-menu-toggle:hover {
            background: var(--bg-white);
            color: var(--primary);
        }

        @media (max-width: 1024px) {
            .nav-links {
                gap: 0;
            }
            .nav-links li a {
                padding: 8px 12px;
                font-size: 13px;
            }
            .search-box {
                min-width: 140px;
                padding: 9px 12px;
            }
            .btn-header-cta {
                padding: 10px 16px;
                font-size: 12px;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 64px;
                left: 0;
                right: 0;
                background: var(--bg-white);
                flex-direction: column;
                padding: 12px 16px;
                gap: 2px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-lg);
                border-radius: 0 0 var(--radius-lg) var(--radius-lg);
            }
            .nav-links.open {
                display: flex;
            }
            .nav-links li a {
                width: 100%;
                padding: 12px 16px;
                border-radius: var(--radius-sm);
                font-size: 15px;
            }
            .search-box {
                display: none;
            }
            .mobile-menu-toggle {
                display: flex;
            }
            .header-actions {
                gap: 8px;
            }
            .btn-header-cta {
                padding: 9px 14px;
                font-size: 12px;
            }
        }

        @media (max-width: 520px) {
            .header-inner {
                height: 56px;
                gap: 12px;
            }
            .logo-text {
                font-size: 16px;
            }
            .logo-icon {
                width: 32px;
                height: 32px;
                font-size: 15px;
            }
            .btn-header-cta {
                padding: 8px 12px;
                font-size: 11px;
                border-radius: var(--radius-xs);
            }
            .nav-links {
                top: 56px;
            }
        }

        /* ========== MAIN CONTENT ========== */
        .main-content {
            flex: 1;
        }

        /* Breadcrumb */
        .breadcrumb-bar {
            background: var(--bg-white);
            border-bottom: 1px solid var(--border-light);
            padding: 14px 0;
        }

        .breadcrumb-list {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            color: var(--text-muted);
            flex-wrap: wrap;
        }

        .breadcrumb-list a {
            color: var(--text-soft);
            transition: color 0.2s ease;
        }

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

        .breadcrumb-list .separator {
            color: var(--text-muted);
            font-size: 10px;
        }

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

        /* Article Banner */
        .article-banner {
            position: relative;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            padding: 80px 0 60px;
            overflow: hidden;
        }

        .article-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.85) 0%, rgba(30, 64, 175, 0.75) 50%, rgba(15, 23, 42, 0.8) 100%);
            z-index: 1;
        }

        .article-banner .container {
            position: relative;
            z-index: 2;
        }

        .article-banner-content {
            max-width: 780px;
        }

        .article-category-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.3px;
            background: rgba(245, 158, 11, 0.25);
            color: var(--accent-light);
            border: 1px solid rgba(245, 158, 11, 0.35);
            margin-bottom: 20px;
            text-transform: uppercase;
        }

        .article-banner h1 {
            font-size: 36px;
            font-weight: 800;
            line-height: 1.3;
            color: #ffffff;
            letter-spacing: -0.5px;
            margin-bottom: 16px;
        }

        .article-banner-meta {
            display: flex;
            align-items: center;
            gap: 20px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.75);
            flex-wrap: wrap;
        }

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

        .article-banner-meta i {
            font-size: 13px;
            opacity: 0.7;
        }

        @media (max-width: 768px) {
            .article-banner {
                padding: 50px 0 36px;
            }
            .article-banner h1 {
                font-size: 26px;
            }
            .article-banner-meta {
                font-size: 13px;
                gap: 14px;
            }
        }

        @media (max-width: 520px) {
            .article-banner {
                padding: 36px 0 28px;
            }
            .article-banner h1 {
                font-size: 22px;
            }
            .article-category-tag {
                font-size: 11px;
                padding: 5px 12px;
            }
        }

        /* Article Body */
        .article-body-section {
            padding: 48px 0 40px;
            background: var(--bg-white);
        }

        .article-layout {
            display: flex;
            gap: 48px;
        }

        .article-main-col {
            flex: 1;
            min-width: 0;
            max-width: 780px;
        }

        .article-sidebar {
            width: 320px;
            flex-shrink: 0;
            display: flex;
            flex-direction: column;
            gap: 28px;
        }

        .article-content {
            font-size: 17px;
            line-height: 1.9;
            color: var(--text);
            word-break: break-word;
        }

        .article-content h2 {
            font-size: 24px;
            font-weight: 700;
            margin: 36px 0 16px;
            color: var(--text);
            letter-spacing: -0.3px;
        }

        .article-content h3 {
            font-size: 20px;
            font-weight: 600;
            margin: 28px 0 12px;
            color: var(--text);
        }

        .article-content p {
            margin-bottom: 16px;
        }

        .article-content ul,
        .article-content ol {
            margin-bottom: 16px;
            padding-left: 24px;
        }

        .article-content ul {
            list-style: disc;
        }

        .article-content ol {
            list-style: decimal;
        }

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

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

        .article-content img {
            border-radius: var(--radius-md);
            margin: 20px 0;
        }

        .article-content a {
            color: var(--primary);
            font-weight: 500;
            text-decoration: underline;
            text-underline-offset: 3px;
        }

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

        .article-content code {
            background: var(--bg-soft);
            padding: 2px 8px;
            border-radius: var(--radius-xs);
            font-family: var(--font-mono);
            font-size: 0.9em;
            color: var(--primary-dark);
        }

        .article-content pre {
            background: #1e293b;
            color: #e2e8f0;
            padding: 20px 24px;
            border-radius: var(--radius-md);
            overflow-x: auto;
            margin: 20px 0;
            font-family: var(--font-mono);
            font-size: 14px;
            line-height: 1.6;
        }

        .article-content pre code {
            background: none;
            padding: 0;
            color: inherit;
        }

        .article-footer-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 12px;
            padding-top: 28px;
            margin-top: 28px;
            border-top: 1px solid var(--border);
            font-size: 13px;
            color: var(--text-muted);
        }

        .article-tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .article-tag {
            padding: 5px 12px;
            border-radius: 16px;
            font-size: 12px;
            font-weight: 500;
            background: var(--bg-soft);
            color: var(--text-soft);
            border: 1px solid var(--border);
            transition: all 0.2s ease;
        }

        .article-tag:hover {
            background: rgba(30, 64, 175, 0.06);
            border-color: var(--primary-light);
            color: var(--primary);
        }

        /* Sidebar */
        .sidebar-card {
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 22px;
        }

        .sidebar-card h4 {
            font-size: 15px;
            font-weight: 700;
            margin-bottom: 14px;
            color: var(--text);
            letter-spacing: -0.2px;
        }

        .sidebar-related-list {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .sidebar-related-list li a {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            padding: 10px 12px;
            border-radius: var(--radius-sm);
            font-size: 13px;
            color: var(--text-soft);
            transition: all 0.2s ease;
            line-height: 1.5;
        }

        .sidebar-related-list li a:hover {
            background: var(--bg-soft);
            color: var(--primary);
        }

        .sidebar-related-list li a i {
            color: var(--primary-light);
            font-size: 11px;
            margin-top: 3px;
            flex-shrink: 0;
        }

        .sidebar-cta-card {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            border-radius: var(--radius-lg);
            padding: 24px;
            color: #fff;
            text-align: center;
        }

        .sidebar-cta-card .cta-icon {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.2);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 14px;
            font-size: 20px;
        }

        .sidebar-cta-card h4 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 8px;
            color: #fff;
        }

        .sidebar-cta-card p {
            font-size: 13px;
            opacity: 0.85;
            margin-bottom: 16px;
            line-height: 1.5;
        }

        .sidebar-cta-card .btn-sidebar-cta {
            display: inline-block;
            padding: 10px 22px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
            background: #fff;
            color: var(--primary);
            transition: all 0.25s ease;
        }

        .sidebar-cta-card .btn-sidebar-cta:hover {
            background: var(--accent-light);
            color: #1e293b;
            box-shadow: var(--shadow-md);
            transform: translateY(-1px);
        }

        @media (max-width: 1024px) {
            .article-layout {
                flex-direction: column;
                gap: 32px;
            }
            .article-main-col {
                max-width: 100%;
            }
            .article-sidebar {
                width: 100%;
                flex-direction: row;
                flex-wrap: wrap;
            }
            .sidebar-card {
                flex: 1;
                min-width: 260px;
            }
            .sidebar-cta-card {
                flex: 1;
                min-width: 260px;
            }
        }

        @media (max-width: 520px) {
            .article-body-section {
                padding: 28px 0 24px;
            }
            .article-content {
                font-size: 15px;
                line-height: 1.8;
            }
            .article-content h2 {
                font-size: 20px;
            }
            .article-content h3 {
                font-size: 17px;
            }
            .article-sidebar {
                flex-direction: column;
            }
            .sidebar-card,
            .sidebar-cta-card {
                min-width: 100%;
            }
        }

        /* Related Posts */
        .related-posts-section {
            padding: 48px 0 56px;
            background: var(--bg);
        }

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

        .section-header h2 {
            font-size: 26px;
            font-weight: 800;
            color: var(--text);
            letter-spacing: -0.4px;
            margin-bottom: 8px;
        }

        .section-header p {
            font-size: 15px;
            color: var(--text-soft);
            max-width: 500px;
            margin: 0 auto;
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 22px;
        }

        .related-card {
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border);
            transition: all 0.3s ease;
            box-shadow: var(--shadow-xs);
        }

        .related-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
            border-color: transparent;
        }

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

        .related-card-body {
            padding: 18px 20px 20px;
        }

        .related-card-tag {
            display: inline-block;
            font-size: 11px;
            font-weight: 600;
            color: var(--primary);
            background: rgba(30, 64, 175, 0.07);
            padding: 4px 10px;
            border-radius: 12px;
            margin-bottom: 10px;
            letter-spacing: 0.2px;
        }

        .related-card h3 {
            font-size: 15px;
            font-weight: 700;
            color: var(--text);
            line-height: 1.5;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .related-card .related-date {
            font-size: 12px;
            color: var(--text-muted);
        }

        @media (max-width: 768px) {
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .related-card-img {
                height: 150px;
            }
            .section-header h2 {
                font-size: 22px;
            }
        }

        @media (max-width: 520px) {
            .related-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .related-card-img {
                height: 200px;
            }
        }

        /* Not Found */
        .not-found-section {
            padding: 80px 0;
            text-align: center;
            background: var(--bg-white);
        }

        .not-found-icon {
            font-size: 64px;
            color: var(--text-muted);
            margin-bottom: 20px;
        }

        .not-found-section h2 {
            font-size: 28px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 10px;
        }

        .not-found-section p {
            font-size: 15px;
            color: var(--text-soft);
            margin-bottom: 24px;
        }

        .btn-back-home {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 24px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 600;
            background: var(--primary);
            color: #fff;
            transition: all 0.25s ease;
        }

        .btn-back-home:hover {
            background: var(--primary-dark);
            box-shadow: var(--shadow-md);
            transform: translateY(-1px);
        }

        /* CTA Section */
        .cta-section {
            padding: 56px 0;
            background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #0f172a 100%);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -30%;
            width: 80%;
            height: 200%;
            background: radial-gradient(ellipse, rgba(59, 130, 246, 0.12) 0%, transparent 70%);
            z-index: 1;
        }

        .cta-section .container {
            position: relative;
            z-index: 2;
        }

        .cta-section h2 {
            font-size: 28px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: -0.4px;
        }

        .cta-section p {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.7);
            max-width: 500px;
            margin: 0 auto 24px;
            line-height: 1.6;
        }

        .btn-cta-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: 28px;
            font-size: 15px;
            font-weight: 700;
            background: var(--accent);
            color: #1e293b;
            transition: all 0.3s ease;
            letter-spacing: 0.2px;
        }

        .btn-cta-primary:hover {
            background: var(--accent-light);
            box-shadow: 0 8px 28px rgba(245, 158, 11, 0.4);
            transform: translateY(-2px);
        }

        .btn-cta-primary:active {
            transform: translateY(0);
        }

        @media (max-width: 520px) {
            .cta-section h2 {
                font-size: 22px;
            }
            .btn-cta-primary {
                padding: 12px 24px;
                font-size: 14px;
            }
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 48px 0 24px;
        }

        .footer-inner {
            display: flex;
            gap: 48px;
            flex-wrap: wrap;
            margin-bottom: 32px;
        }

        .footer-brand {
            flex: 1;
            min-width: 240px;
        }

        .footer-brand .brand-name {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 10px;
            letter-spacing: -0.3px;
        }

        .footer-brand p {
            font-size: 13px;
            color: #94a3b8;
            line-height: 1.7;
            max-width: 300px;
        }

        .footer-links-group {
            min-width: 140px;
        }

        .footer-links-group h4 {
            font-size: 14px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
            letter-spacing: -0.1px;
        }

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

        .footer-links-group ul li a {
            font-size: 13px;
            color: #94a3b8;
            transition: color 0.2s ease;
        }

        .footer-links-group ul li a:hover {
            color: #fff;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 20px;
            text-align: center;
            font-size: 12px;
            color: #64748b;
        }

        @media (max-width: 768px) {
            .footer-inner {
                gap: 28px;
            }
            .footer-brand {
                min-width: 100%;
            }
            .footer-brand p {
                max-width: 100%;
            }
        }

        @media (max-width: 520px) {
            .site-footer {
                padding: 32px 0 16px;
            }
            .footer-inner {
                gap: 20px;
            }
            .footer-links-group {
                min-width: 120px;
            }
        }