/* roulang page: index */
:root {
            --primary: #1D63FF;
            --primary-hover: #0E4ED8;
            --primary-light: #EFF6FF;
            --accent-cyan: #00B4D8;
            --accent-green: #10B981;
            --dark-geek: #0B1528;
            --dark-geek-card: #152238;
            --text-main: #1E293B;
            --text-muted: #64748B;
            --bg-light: #F8FAFC;
            --border-color: #E2E8F0;
            --radius-card: 16px;
            --radius-btn: 8px;
            --shadow-sm: 0 4px 6px -1px rgba(29, 99, 255, 0.04), 0 2px 4px -2px rgba(0, 0, 0, 0.03);
            --shadow-card: 0 10px 25px -5px rgba(29, 99, 255, 0.06), 0 8px 10px -6px rgba(0, 0, 0, 0.03);
            --shadow-hover: 0 20px 30px -10px rgba(29, 99, 255, 0.15);
        }

        /* 基础重置与排版规范 */
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: #FFFFFF;
            line-height: 1.65;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: all 0.25s ease;
        }

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

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

        /* 顶部双行导航系统 */
        .top-bar {
            background-color: #F1F5F9;
            border-bottom: 1px solid var(--border-color);
            font-size: 13px;
            color: var(--text-muted);
            padding: 7px 0;
        }

        .top-bar-item {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .sticky-navbar {
            position: sticky;
            top: 0;
            z-index: 1040;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(226, 232, 240, 0.8);
            box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.03);
            padding: 14px 0;
        }

        .navbar-brand-custom {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.25rem;
            color: var(--dark-geek);
            letter-spacing: -0.5px;
        }

        .brand-logo-icon {
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, var(--primary), var(--accent-cyan));
            color: #FFFFFF;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            box-shadow: 0 4px 10px rgba(29, 99, 255, 0.25);
        }

        .nav-link-custom {
            font-size: 15px;
            font-weight: 500;
            color: #334155 !important;
            padding: 8px 16px !important;
            border-radius: 6px;
            transition: all 0.2s ease;
        }

        .nav-link-custom:hover {
            color: var(--primary) !important;
            background-color: var(--primary-light);
        }

        /* 现代化按钮体系 */
        .btn-brand-primary {
            background-color: var(--primary);
            color: #FFFFFF;
            border: 1px solid var(--primary);
            font-weight: 600;
            padding: 10px 24px;
            border-radius: var(--radius-btn);
            box-shadow: 0 4px 12px rgba(29, 99, 255, 0.25);
            transition: all 0.25s ease;
            min-height: 44px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }

        .btn-brand-primary:hover {
            background-color: var(--primary-hover);
            border-color: var(--primary-hover);
            color: #FFFFFF;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(29, 99, 255, 0.35);
        }

        .btn-brand-outline {
            background-color: #FFFFFF;
            color: var(--dark-geek);
            border: 1px solid var(--border-color);
            font-weight: 600;
            padding: 10px 24px;
            border-radius: var(--radius-btn);
            transition: all 0.25s ease;
            min-height: 44px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }

        .btn-brand-outline:hover {
            background-color: var(--bg-light);
            border-color: var(--primary);
            color: var(--primary);
            transform: translateY(-2px);
        }

        /* 标签与徽章 */
        .badge-brand-subtle {
            background-color: var(--primary-light);
            color: var(--primary);
            font-weight: 600;
            font-size: 0.82rem;
            padding: 6px 14px;
            border-radius: 30px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            border: 1px solid rgba(29, 99, 255, 0.15);
        }

        .badge-dark-subtle {
            background: rgba(255, 255, 255, 0.08);
            color: #93C5FD;
            font-weight: 600;
            font-size: 0.82rem;
            padding: 6px 14px;
            border-radius: 30px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            border: 1px solid rgba(255, 255, 255, 0.12);
        }

        /* 板块公用规范 */
        .section-gap {
            padding: 96px 0;
            position: relative;
        }

        .section-bg-light {
            background-color: var(--bg-light);
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }

        .section-title {
            font-size: 2.15rem;
            font-weight: 800;
            color: var(--dark-geek);
            letter-spacing: -0.5px;
            margin-bottom: 14px;
            line-height: 1.3;
        }

        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-muted);
            max-width: 760px;
            margin-bottom: 48px;
            line-height: 1.7;
        }

        /* 核心卡片系统 */
        .custom-card {
            background-color: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
            height: 100%;
            overflow: hidden;
            display: flex;
            flex-direction: column;
        }

        .custom-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(29, 99, 255, 0.3);
        }

        /* 首屏 Hero 区块 */
        .hero-section {
            position: relative;
            background: linear-gradient(135deg, rgba(248, 250, 252, 0.92) 0%, rgba(239, 246, 255, 0.95) 100%), url('/assets/images/3997f9fb10e76bfa.jpg') center/cover no-repeat;
            padding: 85px 0 95px 0;
            border-bottom: 1px solid var(--border-color);
        }

        .hero-h1 {
            font-size: 2.9rem;
            font-weight: 850;
            color: var(--dark-geek);
            line-height: 1.25;
            letter-spacing: -0.8px;
            margin-bottom: 22px;
        }

        .hero-lead {
            font-size: 1.15rem;
            color: #475569;
            line-height: 1.8;
            margin-bottom: 32px;
        }

        .hero-ticker-box {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 16px 20px;
            box-shadow: var(--shadow-sm);
            margin-bottom: 32px;
        }

        .hero-ticker-item {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: #334155;
            font-weight: 500;
        }

        .hero-dashboard-card {
            background: #FFFFFF;
            border: 1px solid rgba(226, 232, 240, 0.9);
            border-radius: 20px;
            box-shadow: 0 20px 40px -15px rgba(29, 99, 255, 0.12), 0 0 0 1px rgba(29, 99, 255, 0.05);
            padding: 24px;
            position: relative;
        }

        .metric-pill {
            background-color: var(--primary-light);
            border: 1px solid rgba(29, 99, 255, 0.2);
            border-radius: 10px;
            padding: 12px;
            text-align: center;
        }

        .metric-pill .value {
            font-size: 1.45rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
            font-variant-numeric: tabular-nums;
        }

        .metric-pill .label {
            font-size: 12px;
            color: var(--text-muted);
            margin-top: 4px;
        }

        /* 传统痛点 vs AI 对比 */
        .versus-panel {
            border-radius: var(--radius-card);
            padding: 32px;
            height: 100%;
        }

        .versus-panel-legacy {
            background-color: #F8FAFC;
            border: 1px dashed #CBD5E1;
        }

        .versus-panel-modern {
            background: #FFFFFF;
            border: 2px solid var(--primary);
            box-shadow: var(--shadow-card);
            position: relative;
        }

        .versus-panel-modern::before {
            content: "RECOMMENDED";
            position: absolute;
            top: 14px;
            right: 18px;
            font-size: 11px;
            font-weight: 800;
            letter-spacing: 1px;
            color: var(--primary);
            background: var(--primary-light);
            padding: 3px 8px;
            border-radius: 4px;
        }

        .versus-item {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            margin-bottom: 18px;
            font-size: 14.5px;
        }

        .versus-item:last-child {
            margin-bottom: 0;
        }

        /* 算法计算底座 */
        .tech-spec-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 16px;
            margin-top: 24px;
        }

        .tech-spec-item {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 18px;
            border-left: 4px solid var(--primary);
        }

        .tech-spec-item .num {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--dark-geek);
        }

        .tech-spec-item .desc {
            font-size: 13px;
            color: var(--text-muted);
            margin-top: 4px;
        }

        /* 优势网格六卡片 */
        .matrix-icon-box {
            width: 52px;
            height: 52px;
            border-radius: 12px;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            margin-bottom: 20px;
            transition: all 0.3s ease;
        }

        .custom-card:hover .matrix-icon-box {
            background: var(--primary);
            color: #FFFFFF;
            transform: scale(1.08);
        }

        /* 深色高反差案例沙盘 */
        .dark-showcase-section {
            background-color: var(--dark-geek);
            color: #FFFFFF;
            position: relative;
            overflow: hidden;
        }

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

        .dark-showcase-section .section-subtitle {
            color: #94A3B8;
        }

        .sandbox-terminal {
            background-color: var(--dark-geek-card);
            border: 1px solid #1E293B;
            border-radius: 16px;
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
            padding: 24px;
        }

        .terminal-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding-bottom: 16px;
            border-bottom: 1px solid #283548;
            margin-bottom: 20px;
        }

        .terminal-dots {
            display: flex;
            gap: 6px;
        }

        .terminal-dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
        }

        .dot-red { background-color: #EF4444; }
        .dot-yellow { background-color: #F59E0B; }
        .dot-green { background-color: #10B981; }

        /* 四步流程流水线 */
        .flow-step-col {
            position: relative;
        }

        .flow-step-card {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: 14px;
            padding: 24px 20px;
            height: 100%;
            position: relative;
            z-index: 2;
        }

        .flow-step-number {
            font-size: 2.2rem;
            font-weight: 850;
            color: #CBD5E1;
            line-height: 1;
            margin-bottom: 14px;
            font-variant-numeric: tabular-nums;
        }

        .flow-step-card:hover .flow-step-number {
            color: var(--primary);
        }

        /* 关键性能统计条 */
        .metrics-strip {
            background: linear-gradient(135deg, #F8FAFC 0%, #EFF6FF 100%);
            border: 1px solid #DBEAFE;
            border-radius: 18px;
            padding: 40px 24px;
        }

        .metric-stat-title {
            font-size: 2.75rem;
            font-weight: 850;
            color: var(--primary);
            letter-spacing: -1px;
            line-height: 1.1;
        }

        /* 专家 FAQ 美化 */
        .accordion-brand .accordion-item {
            background-color: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: 12px !important;
            margin-bottom: 14px;
            overflow: hidden;
            box-shadow: var(--shadow-sm);
        }

        .accordion-brand .accordion-button {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--dark-geek);
            padding: 20px 24px;
            background-color: #FFFFFF;
            box-shadow: none;
        }

        .accordion-brand .accordion-button:not(.collapsed) {
            color: var(--primary);
            background-color: var(--primary-light);
        }

        .accordion-brand .accordion-button:focus {
            box-shadow: none;
            border-color: rgba(29, 99, 255, 0.2);
        }

        .accordion-brand .accordion-body {
            padding: 20px 24px 24px 24px;
            color: #475569;
            font-size: 15px;
            line-height: 1.75;
        }

        /* 底部 CTA 预约条 */
        .cta-big-card {
            background: linear-gradient(135deg, #0B1528 0%, #162947 100%), url('/assets/images/538fc6927c5811a9.jpg') center/cover no-repeat;
            background-blend-mode: overlay;
            border-radius: 24px;
            padding: 60px 48px;
            color: #FFFFFF;
            box-shadow: 0 20px 40px -10px rgba(11, 21, 40, 0.4);
        }

        .cta-form-control {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 12px 16px;
            font-size: 14.5px;
            color: var(--text-main);
            min-height: 46px;
        }

        .cta-form-control:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(29, 99, 255, 0.2);
        }

        /* 页脚 */
        .site-footer {
            background-color: #070D18;
            color: #94A3B8;
            font-size: 14px;
            padding-top: 70px;
            padding-bottom: 25px;
            border-top: 1px solid #1E293B;
        }

        .footer-heading {
            font-size: 16px;
            font-weight: 700;
            color: #FFFFFF;
            margin-bottom: 22px;
            letter-spacing: -0.2px;
        }

        .footer-links-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .footer-links-list li {
            margin-bottom: 12px;
        }

        .footer-links-list a {
            color: #94A3B8;
        }

        .footer-links-list a:hover {
            color: #FFFFFF;
            padding-left: 4px;
        }

        .footer-bottom {
            margin-top: 50px;
            padding-top: 25px;
            border-top: 1px solid #1E293B;
            font-size: 13px;
            color: #64748B;
        }

        /* 移动端适配响应 */
        @media (max-width: 991.98px) {
            .hero-h1 {
                font-size: 2.2rem;
            }
            .section-gap {
                padding: 64px 0;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .cta-big-card {
                padding: 40px 24px;
            }
        }

        @media (max-width: 575.98px) {
            .hero-h1 {
                font-size: 1.85rem;
            }
            .metric-stat-title {
                font-size: 2.1rem;
            }
            .btn-brand-primary, .btn-brand-outline {
                width: 100%;
            }
        }