/* roulang page: index */
:root {
            --primary: #10B981;
            --primary-hover: #059669;
            --primary-glow: rgba(16, 185, 129, 0.25);
            --secondary: #6366F1;
            --secondary-hover: #4F46E5;
            --bg-base: #0B0F17;
            --bg-surface: #111827;
            --bg-card: #1F2937;
            --bg-card-subtle: #16202E;
            --text-main: #F9FAFB;
            --text-muted: #9CA3AF;
            --border-color: rgba(255, 255, 255, 0.08);
            --border-hover: rgba(16, 185, 129, 0.4);
            --border-radius-sm: 6px;
            --border-radius-md: 10px;
            --border-radius-lg: 16px;
            --box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
            --box-shadow-hover: 0 10px 30px rgba(0, 0, 0, 0.6), 0 0 20px rgba(16, 185, 129, 0.15);
            --transition-base: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            background-color: var(--bg-base);
            color: var(--text-main);
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
            line-height: 1.75;
            letter-spacing: -0.01em;
            margin: 0;
            padding: 0;
            overflow-x: hidden;
        }

        /* Typography */
        h1, h2, h3, h4, h5, h6 {
            color: #FFFFFF;
            font-weight: 700;
            letter-spacing: -0.02em;
            line-height: 1.3;
        }

        p {
            color: var(--text-muted);
            margin-bottom: 1rem;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition-base);
        }

        a:hover {
            color: #34D399;
        }

        /* Nav Floating Card */
        .top-status-bar {
            background: #06090e;
            font-size: 0.8rem;
            color: #6B7280;
            border-bottom: 1px solid var(--border-color);
            padding: 4px 0;
        }

        .header-nav-wrapper {
            position: sticky;
            top: 15px;
            z-index: 1030;
            margin-bottom: -75px;
        }

        .floating-navbar {
            background: rgba(17, 24, 39, 0.88);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid var(--border-color);
            border-radius: 50px;
            padding: 10px 24px;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
        }

        .navbar-brand {
            font-size: 1.25rem;
            font-weight: 800;
            color: #FFFFFF !important;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .navbar-brand i {
            color: var(--primary);
        }

        .nav-link {
            color: #D1D5DB !important;
            font-size: 0.92rem;
            font-weight: 500;
            padding: 8px 16px !important;
            border-radius: 30px;
            transition: var(--transition-base);
        }

        .nav-link:hover, .nav-link.active {
            color: #FFFFFF !important;
            background: rgba(255, 255, 255, 0.06);
        }

        /* Global Sections & Cards */
        section {
            padding: 100px 0;
            position: relative;
        }

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

        .section-header {
            max-width: 760px;
            margin: 0 auto 50px auto;
            text-align: center;
        }

        .section-header .sub-badge {
            display: inline-block;
            background: rgba(16, 185, 129, 0.12);
            color: var(--primary);
            border: 1px solid rgba(16, 185, 129, 0.3);
            border-radius: 30px;
            padding: 4px 14px;
            font-size: 0.82rem;
            font-weight: 600;
            margin-bottom: 14px;
            text-transform: uppercase;
        }

        .section-header h2 {
            font-size: 2.25rem;
            margin-bottom: 16px;
        }

        .dev-card {
            background-color: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius-md);
            padding: 28px;
            height: 100%;
            transition: var(--transition-base);
            box-shadow: var(--box-shadow);
            position: relative;
            overflow: hidden;
        }

        .dev-card:hover {
            border-color: var(--border-hover);
            transform: translateY(-4px);
            box-shadow: var(--box-shadow-hover);
        }

        .card-icon-box {
            width: 52px;
            height: 52px;
            border-radius: var(--border-radius-sm);
            background: rgba(16, 185, 129, 0.1);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            margin-bottom: 20px;
            border: 1px solid rgba(16, 185, 129, 0.2);
        }

        /* Primary and Secondary Buttons */
        .btn-dev-primary {
            background-color: var(--primary);
            color: #0B0F17;
            font-weight: 600;
            padding: 12px 28px;
            border-radius: 30px;
            border: none;
            transition: var(--transition-base);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .btn-dev-primary:hover {
            background-color: #34D399;
            color: #0B0F17;
            transform: translateY(-2px);
            box-shadow: 0 4px 18px var(--primary-glow);
        }

        .btn-dev-outline {
            background-color: transparent;
            color: #FFFFFF;
            font-weight: 600;
            padding: 12px 26px;
            border-radius: 30px;
            border: 1px solid var(--border-color);
            transition: var(--transition-base);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .btn-dev-outline:hover {
            background-color: rgba(255, 255, 255, 0.05);
            border-color: rgba(255, 255, 255, 0.3);
            color: #FFFFFF;
            transform: translateY(-2px);
        }

        /* Section 1: Hero Carousel */
        #hero {
            padding-top: 150px;
            padding-bottom: 80px;
            background: radial-gradient(circle at top right, rgba(99, 102, 241, 0.12), transparent 45%),
                        radial-gradient(circle at bottom left, rgba(16, 185, 129, 0.1), transparent 40%),
                        var(--bg-base);
        }

        .carousel-item-inner {
            padding: 30px 0 50px 0;
        }

        .hero-metric-strip {
            background: rgba(17, 24, 39, 0.7);
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius-md);
            padding: 16px 24px;
            margin-top: 35px;
            display: flex;
            gap: 30px;
        }

        .metric-item {
            display: flex;
            flex-direction: column;
        }

        .metric-item .metric-num {
            color: var(--primary);
            font-weight: 700;
            font-size: 1.35rem;
            line-height: 1.2;
        }

        .metric-item .metric-label {
            font-size: 0.78rem;
            color: var(--text-muted);
            text-transform: uppercase;
        }

        .hero-terminal-mockup {
            background: #070A0F;
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius-md);
            overflow: hidden;
            box-shadow: 0 20px 40px rgba(0,0,0,0.7);
        }

        .terminal-header {
            background: #111622;
            padding: 10px 16px;
            display: flex;
            align-items: center;
            gap: 8px;
            border-bottom: 1px solid var(--border-color);
        }

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

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

        .terminal-body {
            padding: 20px;
            font-family: "Fira Code", monospace, "Segoe UI";
            font-size: 0.85rem;
            color: #A7F3D0;
            line-height: 1.6;
            min-height: 280px;
        }

        /* Section 5: Pipeline Step Layout */
        .pipeline-flow {
            display: flex;
            flex-direction: column;
            gap: 20px;
            position: relative;
        }

        .pipeline-step-node {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius-md);
            padding: 24px;
            display: flex;
            align-items: center;
            gap: 24px;
            position: relative;
            transition: var(--transition-base);
        }

        .pipeline-step-node:hover {
            border-color: var(--primary);
            background: var(--bg-card-subtle);
        }

        .step-index-tag {
            font-size: 1.6rem;
            font-weight: 800;
            color: var(--primary);
            min-width: 48px;
            height: 48px;
            border-radius: 50%;
            background: rgba(16, 185, 129, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1px solid rgba(16, 185, 129, 0.3);
        }

        /* IDE Showcase */
        .ide-mockup-wrapper {
            background: #080C14;
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius-lg);
            overflow: hidden;
            box-shadow: 0 25px 60px rgba(0, 0, 0, 0.6);
        }

        .ide-top-tab {
            background: #111726;
            padding: 10px 20px;
            border-bottom: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .ide-code-view {
            padding: 25px;
            font-family: monospace;
            font-size: 0.9rem;
            line-height: 1.7;
            background: #090E17;
            color: #94A3B8;
        }

        .code-hl-green { color: var(--primary); }
        .code-hl-purple { color: #A78BFA; }
        .code-hl-blue { color: #38BDF8; }

        /* Pricing Card */
        .pricing-box {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius-md);
            padding: 36px 28px;
            transition: var(--transition-base);
            height: 100%;
            display: flex;
            flex-direction: column;
        }

        .pricing-box.featured {
            border-color: var(--primary);
            background: linear-gradient(180deg, rgba(16, 185, 129, 0.05) 0%, var(--bg-card) 100%);
            position: relative;
        }

        .pricing-box.featured::before {
            content: "团队推荐";
            position: absolute;
            top: 14px;
            right: 18px;
            background: var(--primary);
            color: #06090e;
            font-size: 0.72rem;
            font-weight: 700;
            padding: 3px 10px;
            border-radius: 20px;
        }

        .pricing-price {
            font-size: 2.2rem;
            font-weight: 800;
            color: #FFFFFF;
            margin: 20px 0;
        }

        .pricing-price span {
            font-size: 0.9rem;
            color: var(--text-muted);
            font-weight: normal;
        }

        .pricing-feature-list {
            list-style: none;
            padding: 0;
            margin: 0 0 30px 0;
            flex-grow: 1;
        }

        .pricing-feature-list li {
            padding: 8px 0;
            color: #D1D5DB;
            font-size: 0.88rem;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .pricing-feature-list li i {
            color: var(--primary);
            font-size: 0.8rem;
        }

        /* FAQ Accordion */
        .accordion-button {
            background-color: var(--bg-card) !important;
            color: #FFFFFF !important;
            border: 1px solid var(--border-color) !important;
            box-shadow: none !important;
            font-weight: 600;
            padding: 20px 24px;
            border-radius: var(--border-radius-sm) !important;
        }

        .accordion-button:not(.collapsed) {
            border-color: var(--primary) !important;
            background-color: var(--bg-card-subtle) !important;
            color: var(--primary) !important;
        }

        .accordion-button::after {
            filter: invert(1);
        }

        .accordion-item {
            background-color: transparent !important;
            border: none !important;
            margin-bottom: 14px;
        }

        .accordion-body {
            background-color: var(--bg-surface);
            border: 1px solid var(--border-color);
            border-top: none;
            padding: 22px 24px;
            color: var(--text-muted);
            border-radius: 0 0 var(--border-radius-sm) var(--border-radius-sm);
        }

        /* Footer */
        footer {
            background-color: #06090F;
            border-top: 1px solid var(--border-color);
            padding: 70px 0 30px 0;
            color: var(--text-muted);
            font-size: 0.88rem;
        }

        footer h5 {
            font-size: 1rem;
            margin-bottom: 20px;
            color: #FFFFFF;
        }

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

        footer ul li {
            margin-bottom: 10px;
        }

        footer ul li a {
            color: #9CA3AF;
        }

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

        .footer-bottom-bar {
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            margin-top: 50px;
            padding-top: 25px;
            font-size: 0.8rem;
        }

        /* Responsive Breakpoints */
        @media (max-width: 991px) {
            .header-nav-wrapper {
                margin-bottom: 0;
                top: 0;
            }
            .floating-navbar {
                border-radius: 0;
                padding: 10px 15px;
            }
            #hero {
                padding-top: 60px;
            }
            .hero-metric-strip {
                flex-wrap: wrap;
                gap: 15px;
            }
        }