/* roulang page: index */
:root {
            --brand-dark: #0A1118;
            --brand-deep-blue: #121F2D;
            --brand-green: #00E599;
            --brand-cyan: #00B4D8;
            --brand-gradient: linear-gradient(135deg, #00E599 0%, #00B4D8 100%);
            --accent-orange: #FF5A36;
            --bg-light: #F4F7F6;
            --card-bg: #FFFFFF;
            --text-main: #111827;
            --text-muted: #4B5563;
            --border-color: #E5E7EB;
            --card-radius: 1.25rem;
            --btn-radius: 0.75rem;
            --shadow-subtle: 0 10px 30px -5px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
            --shadow-hover: 0 20px 40px -10px rgba(0, 180, 216, 0.18);
        }

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

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

        /* 顶部双行导航 */
        .top-status-bar {
            background-color: var(--brand-dark);
            color: #9CA3AF;
            font-size: 0.825rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            padding: 6px 0;
        }

        .main-navbar {
            background-color: rgba(10, 17, 24, 0.96);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            transition: all 0.3s ease;
        }

        .navbar-brand {
            font-weight: 800;
            font-size: 1.35rem;
            color: #FFFFFF !important;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .navbar-brand-icon {
            width: 32px;
            height: 32px;
            background: var(--brand-gradient);
            border-radius: 8px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: var(--brand-dark);
            font-weight: 900;
            font-size: 1.1rem;
        }

        .nav-link {
            color: #D1D5DB !important;
            font-weight: 500;
            font-size: 0.95rem;
            padding: 0.5rem 0.85rem !important;
            transition: color 0.2s ease;
        }

        .nav-link:hover, .nav-link.active {
            color: var(--brand-green) !important;
        }

        .btn-brand-primary {
            background: var(--brand-gradient);
            color: #0A1118;
            font-weight: 700;
            border: none;
            border-radius: var(--btn-radius);
            padding: 0.65rem 1.4rem;
            box-shadow: 0 4px 15px rgba(0, 229, 153, 0.3);
            transition: all 0.3s ease;
        }

        .btn-brand-primary:hover {
            color: #0A1118;
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(0, 229, 153, 0.45);
        }

        .btn-outline-brand {
            border: 1px solid rgba(255, 255, 255, 0.25);
            color: #FFFFFF;
            font-weight: 600;
            border-radius: var(--btn-radius);
            padding: 0.65rem 1.4rem;
            transition: all 0.25s ease;
        }

        .btn-outline-brand:hover {
            border-color: var(--brand-cyan);
            color: var(--brand-cyan);
            background: rgba(0, 180, 216, 0.05);
        }

        /* 通用徽章与卡片 */
        .data-badge {
            display: inline-flex;
            align-items: center;
            padding: 0.35rem 0.85rem;
            border-radius: 9999px;
            font-size: 0.8rem;
            font-weight: 700;
            background: rgba(0, 229, 153, 0.12);
            color: #00B578;
            border: 1px solid rgba(0, 229, 153, 0.3);
        }

        .data-badge-dark {
            background: rgba(0, 229, 153, 0.1);
            color: var(--brand-green);
            border: 1px solid rgba(0, 229, 153, 0.3);
        }

        .data-badge-orange {
            background: rgba(255, 90, 54, 0.12);
            color: var(--accent-orange);
            border: 1px solid rgba(255, 90, 54, 0.3);
        }

        .tech-card {
            background: var(--card-bg);
            border-radius: var(--card-radius);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-subtle);
            padding: 2.2rem;
            height: 100%;
            transition: all 0.35s cubic-bezier(0.165, 0.84, 0.44, 1);
            position: relative;
            overflow: hidden;
        }

        .tech-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(0, 180, 216, 0.35);
        }

        .section-header {
            margin-bottom: 3.5rem;
        }

        .section-title {
            font-size: 2.25rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            color: var(--text-main);
            margin-bottom: 1rem;
        }

        .section-intro {
            color: var(--text-muted);
            max-width: 760px;
            font-size: 1.05rem;
        }

        .section-padding {
            padding: 5.5rem 0;
        }

        /* 杂志分栏 Hero */
        .magazine-hero {
            background: radial-gradient(circle at 80% 20%, #152A3D 0%, #0A1118 70%);
            color: #FFFFFF;
            padding: 4.5rem 0 5.5rem 0;
            position: relative;
        }

        .magazine-hero-left {
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .hero-title {
            font-size: 3rem;
            font-weight: 900;
            line-height: 1.2;
            margin-bottom: 1.5rem;
            background: linear-gradient(180deg, #FFFFFF 20%, #CBD5E1 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-desc {
            font-size: 1.1rem;
            color: #94A3B8;
            margin-bottom: 2rem;
            max-width: 620px;
        }

        .magazine-hero-card {
            background: rgba(18, 31, 45, 0.7);
            border: 1px solid rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(16px);
            border-radius: var(--card-radius);
            padding: 1.8rem;
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
        }

        .hero-feature-img {
            width: 100%;
            height: 250px;
            object-fit: cover;
            border-radius: 0.85rem;
            margin-bottom: 1.25rem;
        }

        /* 深色沉浸式板块 */
        .dark-immersive-section {
            background-color: var(--brand-deep-blue);
            color: #FFFFFF;
            position: relative;
        }

        .dark-immersive-section .section-title {
            color: #FFFFFF;
        }

        .dark-immersive-section .section-intro {
            color: #94A3B8;
        }

        /* 效能统计条 */
        .metric-bar-container {
            background: linear-gradient(135deg, #0A1118 0%, #162638 100%);
            border-radius: 1.5rem;
            border: 1px solid rgba(0, 229, 153, 0.2);
            padding: 3rem 2rem;
            box-shadow: 0 20px 40px rgba(0,0,0,0.25);
        }

        .metric-number {
            font-size: 2.75rem;
            font-weight: 900;
            background: var(--brand-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            line-height: 1.1;
        }

        /* FAQ 手风琴定制 */
        .accordion-item {
            background-color: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: 1rem !important;
            margin-bottom: 1rem;
            overflow: hidden;
            box-shadow: var(--shadow-subtle);
        }

        .accordion-button {
            font-weight: 700;
            font-size: 1.1rem;
            color: var(--text-main);
            padding: 1.35rem 1.5rem;
            background-color: #FFFFFF;
            box-shadow: none !important;
        }

        .accordion-button:not(.collapsed) {
            color: #00B4D8;
            background-color: #F8FAFC;
            border-left: 4px solid var(--brand-green);
        }

        .accordion-body {
            padding: 1.25rem 1.5rem 1.5rem 1.5rem;
            color: var(--text-muted);
            font-size: 0.98rem;
            line-height: 1.7;
        }

        /* 页脚 */
        footer {
            background-color: var(--brand-dark);
            color: #9CA3AF;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            font-size: 0.9rem;
        }

        .footer-heading {
            color: #FFFFFF;
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 1.25rem;
        }

        .footer-links li {
            margin-bottom: 0.65rem;
        }

        .footer-links a:hover {
            color: var(--brand-green);
        }

        /* 响应式调整 */
        @media (max-width: 991.98px) {
            .hero-title {
                font-size: 2.3rem;
            }
            .section-title {
                font-size: 1.85rem;
            }
            .section-padding {
                padding: 4rem 0;
            }
        }

        @media (max-width: 575.98px) {
            .hero-title {
                font-size: 1.95rem;
            }
            .tech-card {
                padding: 1.5rem;
            }
            .metric-bar-container {
                padding: 2rem 1.2rem;
            }
        }