/* roulang page: index */
:root {
            --bg-base-dark: #0d1117;
            --bg-card-dark: #161b22;
            --bg-light: #f8fafc;
            --bg-light-alt: #edf2f7;
            --primary: #00f2a9;
            --primary-hover: #00d695;
            --secondary: #7928ca;
            --accent-blue: #00d2ff;
            --text-main-dark: #ffffff;
            --text-sub-dark: #94a3b8;
            --text-main-light: #0f172a;
            --text-sub-light: #475569;
            --border-dark: rgba(255, 255, 255, 0.1);
            --border-light: rgba(0, 0, 0, 0.08);
            --radius-sm: 6px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --shadow-glow: 0 8px 24px rgba(0, 242, 169, 0.15);
            --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.06);
            --font-code: "JetBrains Mono", Consolas, "Courier New", monospace;
        }

        body {
            font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main-light);
            background-color: #ffffff;
            line-height: 1.75;
            overflow-x: hidden;
        }

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

        /* 顶部通知栏与主导航 */
        .top-tech-bar {
            background-color: #07090d;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            font-size: 0.8125rem;
            color: var(--text-sub-dark);
            padding: 0.4rem 0;
        }
        .main-navbar {
            background-color: rgba(13, 17, 23, 0.95);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-dark);
            position: sticky;
            top: 0;
            z-index: 1030;
            padding: 0.85rem 0;
        }
        .navbar-brand-custom {
            font-size: 1.25rem;
            font-weight: 800;
            color: #ffffff;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            letter-spacing: -0.5px;
        }
        .navbar-brand-custom i {
            color: var(--primary);
            font-size: 1.35rem;
        }
        .navbar-nav .nav-link {
            color: #cbd5e1;
            font-weight: 500;
            font-size: 0.95rem;
            padding: 0.5rem 0.9rem !important;
            transition: color 0.2s;
        }
        .navbar-nav .nav-link:hover, .navbar-nav .nav-link.active {
            color: var(--primary);
        }

        /* 通用板块规范 */
        .section-padding {
            padding: 5.5rem 0;
        }
        .section-dark {
            background-color: var(--bg-base-dark);
            color: var(--text-main-dark);
        }
        .section-light {
            background-color: var(--bg-light);
            color: var(--text-main-light);
        }
        .section-light-alt {
            background-color: #ffffff;
            color: var(--text-main-light);
            border-top: 1px solid var(--border-light);
            border-bottom: 1px solid var(--border-light);
        }

        .section-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
            font-size: 0.8rem;
            font-weight: 700;
            text-transform: uppercase;
            padding: 0.3rem 0.75rem;
            border-radius: 999px;
            letter-spacing: 0.5px;
            margin-bottom: 1rem;
        }
        .badge-cyan {
            background-color: rgba(0, 242, 169, 0.12);
            color: var(--primary);
            border: 1px solid rgba(0, 242, 169, 0.3);
        }
        .badge-dark-cyan {
            background-color: rgba(0, 242, 169, 0.1);
            color: #059669;
            border: 1px solid rgba(0, 242, 169, 0.25);
        }

        .section-heading-dark {
            font-size: 2.25rem;
            font-weight: 800;
            color: #ffffff;
            letter-spacing: -0.5px;
            margin-bottom: 1rem;
        }
        .section-heading-light {
            font-size: 2.25rem;
            font-weight: 800;
            color: var(--text-main-light);
            letter-spacing: -0.5px;
            margin-bottom: 1rem;
        }
        .section-desc-dark {
            color: var(--text-sub-dark);
            font-size: 1.05rem;
            max-width: 780px;
            margin-bottom: 3rem;
        }
        .section-desc-light {
            color: var(--text-sub-light);
            font-size: 1.05rem;
            max-width: 780px;
            margin-bottom: 3rem;
        }

        /* 按钮重构 */
        .btn-core-primary {
            background-color: var(--primary);
            color: #062b1f;
            font-weight: 700;
            padding: 0.75rem 1.85rem;
            border-radius: var(--radius-md);
            border: none;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            box-shadow: 0 4px 14px rgba(0, 242, 169, 0.25);
            transition: all 0.25s ease;
            min-height: 46px;
        }
        .btn-core-primary:hover {
            background-color: var(--primary-hover);
            transform: translateY(-2px);
            box-shadow: var(--shadow-glow);
            color: #041f16;
        }
        .btn-core-secondary {
            background-color: rgba(255, 255, 255, 0.08);
            color: #ffffff;
            border: 1px solid var(--border-dark);
            font-weight: 600;
            padding: 0.75rem 1.85rem;
            border-radius: var(--radius-md);
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            min-height: 46px;
        }
        .btn-core-secondary:hover {
            background-color: rgba(255, 255, 255, 0.15);
            color: #ffffff;
            transform: translateY(-2px);
        }

        /* 板块1：Hero 对比选型与主视觉 */
        .hero-section {
            background: linear-gradient(180deg, #07090d 0%, var(--bg-base-dark) 100%);
            position: relative;
            padding: 4.5rem 0 5.5rem;
            border-bottom: 1px solid var(--border-dark);
            background-image: radial-gradient(circle at 80% 20%, rgba(0, 242, 169, 0.07) 0%, transparent 50%),
                              radial-gradient(circle at 10% 80%, rgba(121, 40, 202, 0.08) 0%, transparent 40%);
        }
        .hero-h1 {
            font-size: 3rem;
            font-weight: 800;
            line-height: 1.25;
            letter-spacing: -1px;
            color: #ffffff;
            margin-bottom: 1.25rem;
        }
        .hero-lead {
            font-size: 1.125rem;
            color: var(--text-sub-dark);
            line-height: 1.8;
            margin-bottom: 2rem;
        }
        .hero-compare-card {
            background-color: var(--bg-card-dark);
            border: 1px solid rgba(0, 242, 169, 0.4);
            border-radius: var(--radius-lg);
            padding: 2.25rem;
            box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
            position: relative;
        }
        .hero-tag-recommended {
            position: absolute;
            top: -14px;
            right: 24px;
            background: linear-gradient(90deg, #00f2a9, #00d2ff);
            color: #062b1f;
            font-size: 0.75rem;
            font-weight: 800;
            padding: 0.35rem 0.9rem;
            border-radius: 999px;
            text-transform: uppercase;
        }
        .feature-checklist {
            list-style: none;
            padding: 0;
            margin: 1.5rem 0 2rem;
        }
        .feature-checklist li {
            font-size: 0.925rem;
            color: #cbd5e1;
            margin-bottom: 0.75rem;
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
        .feature-checklist li i {
            color: var(--primary);
            font-size: 0.85rem;
        }

        /* 板块2：适用人群 (分栏画像卡) */
        .user-card {
            background: #ffffff;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 2.25rem;
            height: 100%;
            transition: all 0.25s ease;
        }
        .user-card:hover {
            box-shadow: var(--shadow-card);
            border-color: #cbd5e1;
        }
        .user-card-icon {
            width: 48px;
            height: 48px;
            background: rgba(0, 242, 169, 0.1);
            color: #059669;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.25rem;
            margin-bottom: 1.25rem;
        }

        /* 板块3：谁适合 / 谁不适合 对照卡 */
        .fit-boundary-card {
            border-radius: var(--radius-md);
            padding: 2.25rem;
            height: 100%;
        }
        .fit-boundary-card.suitable {
            background: rgba(0, 242, 169, 0.04);
            border: 1px solid rgba(0, 242, 169, 0.3);
        }
        .fit-boundary-card.unsuitable {
            background: #fcfcfc;
            border: 1px solid #e2e8f0;
        }

        /* 板块4：核心引擎规格与架构解析 */
        .spec-item-box {
            background-color: var(--bg-card-dark);
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-md);
            padding: 1.5rem;
            margin-bottom: 1rem;
        }
        .spec-item-box .metric-title {
            color: var(--primary);
            font-size: 1.15rem;
            font-weight: 700;
            font-family: var(--font-code);
        }

        /* 板块5：核心技术 6-Grid */
        .feature-grid-card {
            background-color: #ffffff;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 2rem;
            height: 100%;
            transition: all 0.25s ease;
            position: relative;
        }
        .feature-grid-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 30px rgba(0,0,0,0.06);
            border-color: #94a3b8;
        }
        .feature-grid-index {
            position: absolute;
            top: 1.5rem;
            right: 1.5rem;
            font-size: 1.5rem;
            font-family: var(--font-code);
            font-weight: 800;
            color: #e2e8f0;
        }

        /* 板块6：开发套件与工具链 3-Grid */
        .toolkit-card {
            background-color: var(--bg-card-dark);
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-md);
            overflow: hidden;
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .toolkit-img-wrap {
            height: 200px;
            overflow: hidden;
            position: relative;
        }
        .toolkit-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .toolkit-card:hover .toolkit-img-wrap img {
            transform: scale(1.05);
        }
        .toolkit-body {
            padding: 1.75rem;
            display: flex;
            flex-direction: column;
            flex-grow: 1;
        }
        .sdk-badge {
            font-size: 0.75rem;
            font-family: var(--font-code);
            background: rgba(255, 255, 255, 0.08);
            color: #cbd5e1;
            padding: 0.25rem 0.5rem;
            border-radius: var(--radius-sm);
        }

        /* 板块7：深色沉浸渲染技术 Deep-Dive */
        .deepdive-wrapper {
            background: #090c10;
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-lg);
            padding: 3rem;
        }

        /* 板块8：开发者工作流 Pipeline */
        .flow-step-node {
            background: #ffffff;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 1.75rem;
            position: relative;
            height: 100%;
        }
        .flow-step-num {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: #0f172a;
            color: #ffffff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.9rem;
            margin-bottom: 1rem;
        }

        /* 板块9：技术指标数据条 */
        .metrics-strip {
            background-color: #0b0f15;
            border-top: 1px solid var(--border-dark);
            border-bottom: 1px solid var(--border-dark);
            padding: 3.5rem 0;
        }
        .metric-val {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--primary);
            font-family: var(--font-code);
            line-height: 1.1;
            margin-bottom: 0.5rem;
        }
        .metric-label {
            color: var(--text-sub-dark);
            font-size: 0.95rem;
        }

        /* 板块10：真实工作室口碑墙 */
        .testimonial-item {
            background: #ffffff;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 2rem;
            height: 100%;
        }
        .studio-avatar {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: #e2e8f0;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #475569;
            font-weight: 700;
        }

        /* 板块11：技术资讯与更新日志 */
        .news-featured-card {
            background: var(--bg-card-dark);
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-md);
            overflow: hidden;
            height: 100%;
        }
        .news-small-card {
            background: var(--bg-card-dark);
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-md);
            padding: 1.5rem;
            margin-bottom: 1.25rem;
        }

        /* 页脚规范 */
        .site-footer {
            background-color: #05070a;
            color: var(--text-sub-dark);
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 4.5rem 0 2rem;
            font-size: 0.9rem;
        }
        .site-footer h6 {
            color: #ffffff;
            font-weight: 700;
            font-size: 1rem;
            margin-bottom: 1.25rem;
        }
        .site-footer ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .site-footer ul li {
            margin-bottom: 0.65rem;
        }
        .site-footer ul li a:hover {
            color: var(--primary);
        }
        .footer-legal-line {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            margin-top: 3.5rem;
            padding-top: 2rem;
            font-size: 0.8125rem;
            color: #64748b;
        }

        @media (max-width: 991.98px) {
            .hero-h1 {
                font-size: 2.3rem;
            }
            .section-padding {
                padding: 4rem 0;
            }
            .hero-compare-card {
                margin-top: 2.5rem;
            }
        }
        @media (max-width: 767.98px) {
            .section-padding {
                padding: 3.25rem 0;
            }
            .section-heading-dark, .section-heading-light {
                font-size: 1.75rem;
            }
            .hero-h1 {
                font-size: 1.95rem;
            }
            .metric-val {
                font-size: 2.2rem;
            }
        }