/* roulang page: index */
:root {
            --bg-deep: #0a0d14;
            --bg-dark: #0f141d;
            --bg-surface: #161c28;
            --bg-elevated: #1f2737;
            --accent-cyan: #00f0ff;
            --accent-cyan-hover: #33f4ff;
            --accent-purple: #8a2be2;
            --accent-green: #10b981;
            --text-pure: #f8fafc;
            --text-secondary: #94a3b8;
            --text-tertiary: #64748b;
            --border-dim: rgba(255, 255, 255, 0.08);
            --border-glow: rgba(0, 240, 255, 0.25);
            --glow-cyan: 0 0 20px rgba(0, 240, 255, 0.35);
            --radius-md: 8px;
            --radius-lg: 12px;
            --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-deep);
            color: var(--text-pure);
            margin: 0;
            padding: 0;
            line-height: 1.65;
            overflow-x: hidden;
        }

        /* 基础与链接重构 */
        a {
            color: var(--accent-cyan);
            text-decoration: none;
            transition: var(--transition-smooth);
        }
        a:hover {
            color: var(--accent-cyan-hover);
        }

        /* 顶部通栏 Top Bar */
        .top-sub-bar {
            background-color: #07090e;
            border-bottom: 1px solid var(--border-dim);
            font-size: 0.85rem;
            padding: 7px 0;
            color: var(--text-secondary);
        }
        .top-sub-bar a {
            color: var(--text-secondary);
        }
        .top-sub-bar a:hover {
            color: var(--accent-cyan);
        }
        .lang-capsule {
            display: inline-flex;
            align-items: center;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid var(--border-dim);
            border-radius: 20px;
            padding: 2px 8px;
            font-size: 0.75rem;
            color: var(--text-secondary);
        }
        .lang-capsule span.active {
            color: var(--accent-cyan);
            font-weight: 700;
        }

        /* 主导航栏 */
        .site-navbar {
            background-color: rgba(15, 20, 29, 0.88);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-dim);
            position: sticky;
            top: 0;
            z-index: 1040;
            padding: 14px 0;
            transition: var(--transition-smooth);
        }
        .navbar-brand-custom {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.28rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            color: var(--text-pure);
        }
        .brand-icon-box {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-md);
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #000;
            font-size: 1.1rem;
            box-shadow: 0 0 12px rgba(0, 240, 255, 0.4);
        }
        .site-navbar .nav-link {
            color: var(--text-secondary);
            font-size: 0.95rem;
            font-weight: 500;
            padding: 8px 14px;
            transition: var(--transition-smooth);
        }
        .site-navbar .nav-link:hover,
        .site-navbar .nav-link:focus {
            color: var(--accent-cyan);
        }
        .navbar-toggler {
            border: 1px solid var(--border-dim);
            color: var(--text-pure);
        }
        .navbar-toggler:focus {
            box-shadow: none;
        }

        /* 按钮系统 */
        .btn-game-primary {
            background-color: var(--accent-cyan);
            color: #050a10;
            font-weight: 700;
            border-radius: var(--radius-md);
            padding: 10px 24px;
            border: 1px solid var(--accent-cyan);
            box-shadow: 0 0 14px rgba(0, 240, 255, 0.3);
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: var(--transition-smooth);
            min-height: 44px;
        }
        .btn-game-primary:hover,
        .btn-game-primary:focus {
            background-color: var(--accent-cyan-hover);
            color: #000;
            box-shadow: 0 0 22px rgba(0, 240, 255, 0.55);
            transform: translateY(-2px);
        }
        .btn-game-outline {
            background-color: rgba(255, 255, 255, 0.04);
            color: var(--text-pure);
            font-weight: 600;
            border-radius: var(--radius-md);
            padding: 10px 24px;
            border: 1px solid var(--border-dim);
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: var(--transition-smooth);
            min-height: 44px;
        }
        .btn-game-outline:hover,
        .btn-game-outline:focus {
            background-color: rgba(255, 255, 255, 0.1);
            color: var(--accent-cyan);
            border-color: var(--accent-cyan);
            transform: translateY(-2px);
        }

        /* 通用板块与排版 */
        .section-padding {
            padding: 85px 0;
            position: relative;
        }
        .section-alt {
            background-color: var(--bg-dark);
            border-top: 1px solid var(--border-dim);
            border-bottom: 1px solid var(--border-dim);
        }
        .section-darker {
            background-color: #06090e;
            border-top: 1px solid var(--border-dim);
            border-bottom: 1px solid var(--border-dim);
        }
        .section-header {
            margin-bottom: 48px;
        }
        .section-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 12px;
            background: rgba(0, 240, 255, 0.08);
            border: 1px solid rgba(0, 240, 255, 0.25);
            border-radius: 4px;
            color: var(--accent-cyan);
            font-size: 0.8rem;
            font-weight: 700;
            letter-spacing: 0.5px;
            text-transform: uppercase;
            margin-bottom: 14px;
        }
        .section-title {
            font-size: 2.15rem;
            font-weight: 800;
            line-height: 1.3;
            letter-spacing: -0.5px;
            color: var(--text-pure);
            margin-bottom: 16px;
        }
        .section-desc {
            color: var(--text-secondary);
            font-size: 1.05rem;
            line-height: 1.7;
            max-width: 780px;
        }

        /* 统一卡片 */
        .game-card {
            background-color: var(--bg-surface);
            border: 1px solid var(--border-dim);
            border-radius: var(--radius-md);
            padding: 28px;
            height: 100%;
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }
        .game-card:hover {
            transform: translateY(-4px);
            border-color: var(--accent-cyan);
            box-shadow: 0 10px 25px -5px rgba(0, 240, 255, 0.12);
        }

        /* 首屏轮播 */
        .hero-section {
            position: relative;
            background: #080b11;
            overflow: hidden;
        }
        .carousel-item {
            min-height: 580px;
            position: relative;
        }
        .hero-slide-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            filter: brightness(0.28) contrast(1.1);
        }
        .hero-slide-content {
            position: relative;
            z-index: 2;
            padding: 100px 0;
        }
        .hero-title {
            font-size: 3rem;
            font-weight: 900;
            letter-spacing: -1px;
            line-height: 1.2;
            margin-bottom: 22px;
            background: linear-gradient(120deg, #ffffff 40%, var(--accent-cyan) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero-desc {
            font-size: 1.15rem;
            line-height: 1.75;
            color: var(--text-secondary);
            margin-bottom: 34px;
        }
        .carousel-indicators [data-bs-target] {
            width: 44px;
            height: 4px;
            border-radius: 2px;
            background-color: rgba(255, 255, 255, 0.35);
            border: 0;
        }
        .carousel-indicators .active {
            background-color: var(--accent-cyan);
            box-shadow: 0 0 10px var(--accent-cyan);
        }

        /* 底层引擎架构区 */
        .tech-spec-badge {
            background: rgba(16, 185, 129, 0.1);
            border: 1px solid rgba(16, 185, 129, 0.3);
            color: var(--accent-green);
            padding: 6px 12px;
            border-radius: 4px;
            font-size: 0.85rem;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 15px;
        }
        .img-frame-tech {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-dim);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.45);
        }
        .img-frame-tech img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
            transition: var(--transition-smooth);
        }
        .img-frame-tech:hover img {
            transform: scale(1.02);
        }

        /* 核心优势矩阵 */
        .advantage-icon-box {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-md);
            background: rgba(0, 240, 255, 0.08);
            border: 1px solid rgba(0, 240, 255, 0.2);
            color: var(--accent-cyan);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.35rem;
            margin-bottom: 20px;
        }
        .spec-micro-tag {
            font-size: 0.76rem;
            color: var(--text-tertiary);
            border-top: 1px solid var(--border-dim);
            padding-top: 14px;
            margin-top: 14px;
            display: flex;
            align-items: center;
            gap: 5px;
        }

        /* 流程方案步骤 */
        .workflow-step-card {
            background-color: var(--bg-surface);
            border: 1px solid var(--border-dim);
            border-radius: var(--radius-md);
            padding: 24px;
            height: 100%;
            position: relative;
        }
        .step-number {
            font-family: monospace;
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--accent-cyan);
            line-height: 1;
            margin-bottom: 12px;
            opacity: 0.9;
        }

        /* 深色理念与代码区 */
        .code-box-wrapper {
            background: #05070a;
            border: 1px solid var(--border-dim);
            border-radius: var(--radius-md);
            padding: 20px;
            font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
            font-size: 0.88rem;
            color: #38bdf8;
            overflow-x: auto;
        }

        /* 数据计数统计条 */
        .runtime-stat-item {
            text-align: center;
            padding: 20px 10px;
        }
        .stat-value {
            font-size: 2.8rem;
            font-weight: 900;
            letter-spacing: -1px;
            color: var(--accent-cyan);
            line-height: 1.1;
            font-family: monospace;
        }
        .stat-label {
            color: var(--text-secondary);
            font-size: 0.95rem;
            margin-top: 8px;
            font-weight: 500;
        }

        /* 评价卡片 */
        .review-quote-icon {
            color: rgba(0, 240, 255, 0.2);
            font-size: 2rem;
            line-height: 1;
            margin-bottom: 12px;
        }
        .review-author {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-top: 20px;
            padding-top: 16px;
            border-top: 1px solid var(--border-dim);
        }
        .author-avatar-stub {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--bg-elevated);
            border: 1px solid var(--accent-cyan);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            color: var(--accent-cyan);
            flex-shrink: 0;
        }

        /* 生态伙伴徽章墙 */
        .ecosystem-badge-item {
            background: var(--bg-surface);
            border: 1px solid var(--border-dim);
            border-radius: var(--radius-md);
            padding: 16px 20px;
            text-align: center;
            color: var(--text-secondary);
            font-weight: 600;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            transition: var(--transition-smooth);
        }
        .ecosystem-badge-item:hover {
            border-color: var(--accent-cyan);
            color: var(--text-pure);
            background: var(--bg-elevated);
        }

        /* 手风琴 FAQ 深度定制 */
        .accordion-custom .accordion-item {
            background-color: var(--bg-surface);
            border: 1px solid var(--border-dim);
            border-radius: var(--radius-md) !important;
            margin-bottom: 14px;
            overflow: hidden;
        }
        .accordion-custom .accordion-button {
            background-color: var(--bg-surface);
            color: var(--text-pure);
            font-size: 1.05rem;
            font-weight: 600;
            padding: 20px 24px;
            box-shadow: none;
            border: none;
        }
        .accordion-custom .accordion-button:not(.collapsed) {
            background-color: var(--bg-elevated);
            color: var(--accent-cyan);
            border-left: 4px solid var(--accent-cyan);
        }
        .accordion-custom .accordion-button::after {
            filter: invert(1);
        }
        .accordion-custom .accordion-body {
            background-color: var(--bg-surface);
            color: var(--text-secondary);
            font-size: 0.98rem;
            line-height: 1.75;
            padding: 20px 24px;
            border-top: 1px solid var(--border-dim);
        }

        /* 转化区与表单 */
        .conversion-wrapper {
            background: linear-gradient(135deg, rgba(16, 24, 38, 0.95), rgba(7, 10, 16, 0.95));
            border: 1px solid var(--border-glow);
            border-radius: var(--radius-lg);
            padding: 50px 40px;
            box-shadow: 0 0 35px rgba(0, 240, 255, 0.1);
        }
        .form-control-custom {
            background-color: rgba(255, 255, 255, 0.04);
            border: 1px solid var(--border-dim);
            color: var(--text-pure);
            border-radius: var(--radius-md);
            padding: 12px 16px;
            transition: var(--transition-smooth);
        }
        .form-control-custom:focus {
            background-color: rgba(255, 255, 255, 0.08);
            border-color: var(--accent-cyan);
            color: var(--text-pure);
            box-shadow: 0 0 10px rgba(0, 240, 255, 0.25);
            outline: none;
        }
        .form-select-custom {
            background-color: #101622;
            border: 1px solid var(--border-dim);
            color: var(--text-pure);
            border-radius: var(--radius-md);
            padding: 12px 16px;
        }
        .form-select-custom:focus {
            border-color: var(--accent-cyan);
            color: var(--text-pure);
            box-shadow: 0 0 10px rgba(0, 240, 255, 0.25);
            outline: none;
        }

        /* 页脚 */
        .site-footer {
            background-color: #05070a;
            border-top: 1px solid var(--border-dim);
            padding: 70px 0 30px;
            color: var(--text-secondary);
            font-size: 0.92rem;
        }
        .footer-heading {
            color: var(--text-pure);
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 20px;
            letter-spacing: -0.2px;
        }
        .footer-links-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-links-list li {
            margin-bottom: 10px;
        }
        .footer-links-list a {
            color: var(--text-secondary);
            transition: var(--transition-smooth);
        }
        .footer-links-list a:hover {
            color: var(--accent-cyan);
            padding-left: 4px;
        }
        .footer-bottom {
            margin-top: 50px;
            padding-top: 25px;
            border-top: 1px solid var(--border-dim);
            font-size: 0.85rem;
            color: var(--text-tertiary);
        }

        /* 移动端与自适应优化 */
        @media (max-width: 991px) {
            .hero-title {
                font-size: 2.25rem;
            }
            .section-padding {
                padding: 60px 0;
            }
            .stat-value {
                font-size: 2.3rem;
            }
        }
        @media (max-width: 576px) {
            .hero-title {
                font-size: 1.85rem;
            }
            .conversion-wrapper {
                padding: 30px 20px;
            }
            .btn-game-primary, .btn-game-outline {
                width: 100%;
                justify-content: center;
            }
        }