/* roulang page: index */
:root {
            --brand-deep: #0F4C81;
            --brand-dark: #0B132B;
            --brand-blue: #007BFF;
            --brand-cyan: #00A3C4;
            --bg-light: #F7FAFC;
            --bg-white: #FFFFFF;
            --text-main: #1A202C;
            --text-muted: #4A5568;
            --text-sub: #718096;
            --border-color: rgba(226, 232, 240, 0.8);
            --card-shadow: 0 4px 20px -2px rgba(15, 76, 129, 0.06);
            --card-shadow-hover: 0 14px 30px -4px rgba(15, 76, 129, 0.12);
            --radius-md: 12px;
            --radius-lg: 16px;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
            color: var(--text-main);
            background-color: var(--bg-light);
            line-height: 1.65;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.25s ease;
        }

        /* 顶部微型信息条 */
        .top-info-bar {
            background-color: var(--brand-dark);
            font-size: 0.8125rem;
            color: #A0AEC0;
            height: 38px;
            line-height: 38px;
        }
        .top-info-bar a {
            color: #CBD5E0;
        }
        .top-info-bar a:hover {
            color: var(--brand-cyan);
        }

        /* 主导航条 */
        .site-navbar {
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-color);
            padding: 0.65rem 0;
            z-index: 1030;
        }
        .navbar-brand-custom {
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--brand-deep);
            display: flex;
            align-items: center;
            letter-spacing: -0.5px;
        }
        .navbar-brand-custom i {
            color: var(--brand-blue);
            margin-right: 8px;
        }
        .nav-link-custom {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-muted);
            padding: 0.5rem 0.9rem !important;
            border-radius: 6px;
        }
        .nav-link-custom:hover, .nav-link-custom.active {
            color: var(--brand-deep);
            background-color: rgba(15, 76, 129, 0.05);
        }

        /* 通用区块排版 */
        section {
            position: relative;
        }
        .section-padding {
            padding-top: 5rem;
            padding-bottom: 5rem;
        }
        .section-header {
            margin-bottom: 3.5rem;
        }
        .section-badge {
            display: inline-block;
            font-size: 0.8125rem;
            font-weight: 700;
            color: var(--brand-blue);
            background: rgba(0, 123, 255, 0.08);
            padding: 0.35rem 0.85rem;
            border-radius: 50px;
            margin-bottom: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }
        .section-title {
            font-size: 2.15rem;
            font-weight: 800;
            color: var(--text-main);
            line-height: 1.3;
            margin-bottom: 1rem;
        }
        .section-subtitle {
            font-size: 1rem;
            color: var(--text-muted);
            max-width: 780px;
            margin: 0 auto;
        }

        /* 卡片基础系统 */
        .custom-card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            box-shadow: var(--card-shadow);
            transition: transform 0.25s ease, box-shadow 0.25s ease;
            height: 100%;
        }
        .custom-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--card-shadow-hover);
        }

        /* 按钮系统 */
        .btn-brand-primary {
            background-color: var(--brand-deep);
            color: #ffffff;
            font-weight: 600;
            border-radius: 8px;
            padding: 0.68rem 1.6rem;
            border: 1px solid var(--brand-deep);
            transition: all 0.25s ease;
            min-height: 44px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }
        .btn-brand-primary:hover {
            background-color: #0b375d;
            border-color: #0b375d;
            color: #ffffff;
            transform: translateY(-1px);
        }
        .btn-brand-outline {
            background-color: transparent;
            color: var(--brand-deep);
            font-weight: 600;
            border-radius: 8px;
            padding: 0.68rem 1.6rem;
            border: 1px solid rgba(15, 76, 129, 0.4);
            min-height: 44px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }
        .btn-brand-outline:hover {
            background-color: rgba(15, 76, 129, 0.05);
            color: var(--brand-deep);
            border-color: var(--brand-deep);
        }

        /* 1. Hero 样式 */
        .hero-section {
            background-color: #F0F4F8;
            background-image: linear-gradient(135deg, rgba(240, 244, 248, 0.96) 0%, rgba(255, 255, 255, 0.94) 100%), url('/assets/images/54a9ac4a761d2d49.jpg');
            background-size: cover;
            background-position: center;
            padding-top: 4.5rem;
            padding-bottom: 5.5rem;
        }
        .hero-title {
            font-size: 2.75rem;
            font-weight: 800;
            line-height: 1.25;
            color: var(--text-main);
            margin-bottom: 1.25rem;
        }
        .hero-desc {
            font-size: 1.05rem;
            color: var(--text-muted);
            line-height: 1.75;
            margin-bottom: 2rem;
        }
        .quick-entry-grid {
            background: #ffffff;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            padding: 1.75rem;
            box-shadow: 0 10px 30px -5px rgba(15, 76, 129, 0.08);
        }
        .quick-entry-item {
            padding: 1.25rem;
            border-radius: var(--radius-md);
            background: var(--bg-light);
            border: 1px solid #EDF2F7;
            transition: all 0.25s ease;
            display: flex;
            align-items: flex-start;
            gap: 1rem;
        }
        .quick-entry-item:hover {
            background: #ffffff;
            border-color: var(--brand-blue);
            box-shadow: var(--card-shadow);
            transform: translateY(-2px);
        }
        .quick-entry-icon {
            width: 44px;
            height: 44px;
            border-radius: 10px;
            background: rgba(0, 123, 255, 0.12);
            color: var(--brand-blue);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.25rem;
            flex-shrink: 0;
        }

        /* 5. 深色对比架构区 */
        .dark-arch-section {
            background-color: var(--brand-dark);
            color: #E0E6ED;
        }
        .dark-arch-section .section-title {
            color: #FFFFFF;
        }
        .dark-arch-section .section-subtitle {
            color: #A0AEC0;
        }
        .arch-metric-card {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius-md);
            padding: 2.25rem 1.75rem;
            backdrop-filter: blur(8px);
            transition: all 0.25s ease;
        }
        .arch-metric-card:hover {
            border-color: var(--brand-cyan);
            background: rgba(255, 255, 255, 0.07);
        }

        /* 计数条 */
        .counter-strip {
            background: #FFFFFF;
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
            padding: 3rem 0;
        }
        .counter-number {
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--brand-deep);
            line-height: 1;
            margin-bottom: 0.5rem;
        }

        /* Accordion 定制 */
        .accordion-item {
            border: 1px solid var(--border-color);
            margin-bottom: 0.85rem;
            border-radius: var(--radius-md) !important;
            overflow: hidden;
            box-shadow: var(--card-shadow);
        }
        .accordion-button {
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--text-main);
            background-color: #FFFFFF;
            padding: 1.2rem 1.5rem;
        }
        .accordion-button:not(.collapsed) {
            color: var(--brand-deep);
            background-color: rgba(15, 76, 129, 0.03);
            box-shadow: none;
            border-left: 4px solid var(--brand-deep);
        }
        .accordion-button:focus {
            box-shadow: none;
            border-color: var(--border-color);
        }
        .accordion-body {
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.7;
            padding: 1.25rem 1.5rem 1.5rem;
            background-color: #FFFFFF;
        }

        /* 页脚 */
        .site-footer {
            background-color: #0E1726;
            color: #A0AEC0;
            padding-top: 4.5rem;
            padding-bottom: 2rem;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            font-size: 0.925rem;
        }
        .footer-brand {
            font-size: 1.35rem;
            font-weight: 800;
            color: #FFFFFF;
            margin-bottom: 1.25rem;
            display: inline-block;
        }
        .footer-title {
            font-size: 1rem;
            font-weight: 700;
            color: #FFFFFF;
            margin-bottom: 1.25rem;
        }
        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-links li {
            margin-bottom: 0.75rem;
        }
        .footer-links a:hover {
            color: var(--brand-cyan);
            padding-left: 4px;
        }
        .footer-bottom {
            margin-top: 3.5rem;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 0.825rem;
            color: #718096;
        }

        @media (max-width: 991.98px) {
            .hero-title {
                font-size: 2.15rem;
            }
            .section-title {
                font-size: 1.85rem;
            }
            .section-padding {
                padding-top: 3.5rem;
                padding-bottom: 3.5rem;
            }
        }