:root {
            --bg-deep: #040A08;
            --bg-card: rgba(10, 26, 20, 0.5);
            --border-subtle: rgba(255, 255, 255, 0.05);
            --border-glow: rgba(16, 185, 129, 0.28);
            --accent-300: #6EE7B7;
            --accent-400: #34D399;
            --accent-500: #10B981;
            --accent-600: #059669;
            --accent-700: #047857;
            --teal-400: #2DD4BF;
            --text-primary: #EDEDF0;
            --text-secondary: #9CA3AF;
            --text-muted: #6B7280;
            --amber: #FBBF24;
            --radius-xl: 32px;
            --radius-2xl: 48px;
            --radius-3xl: 64px;
            --transition-fast: 0.2s;
            --transition-smooth: 0.28s;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: var(--bg-deep);
            color: var(--text-primary);
            overflow-x: hidden;
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }

        .glow-bg {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: 0;
            background:
                radial-gradient(circle at 20% 25%, rgba(16, 185, 129, 0.07) 0%, rgba(4, 10, 8, 0) 55%),
                radial-gradient(circle at 78% 65%, rgba(20, 184, 166, 0.04) 0%, rgba(4, 10, 8, 0) 48%);
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 32px;
            position: relative;
            z-index: 2;
        }

        /* ── Header ── */
        header {
            background: rgba(4, 10, 8, 0.88);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-subtle);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 16px 0;
            flex-wrap: wrap;
        }
        .logo {
            font-size: 1.5rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            background: linear-gradient(125deg, #FFFFFF, #34D399, #10B981);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            text-decoration: none;
            white-space: nowrap;
        }
        .logo .icon-rocket {
            display: inline-block;
            margin-right: 3px;
            animation: rocketBounce 2s ease-in-out infinite;
        }
        @keyframes rocketBounce {
            0%,
            100% {
                transform: translateY(0);
            }
            30% {
                transform: translateY(-6px);
            }
            50% {
                transform: translateY(0);
            }
            70% {
                transform: translateY(-3px);
            }
        }
        .nav-links {
            display: flex;
            gap: 28px;
            align-items: center;
            flex-wrap: wrap;
        }
        .nav-links a {
            text-decoration: none;
            font-weight: 500;
            color: #A1A1AA;
            transition: var(--transition-fast);
            font-size: 0.88rem;
            white-space: nowrap;
            position: relative;
        }
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 50%;
            width: 0;
            height: 2px;
            background: var(--accent-500);
            transition: var(--transition-fast);
            transform: translateX(-50%);
            border-radius: 2px;
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--accent-400);
        }
        .nav-links a:hover::after,
        .nav-links a.active::after {
            width: 60%;
        }

        /* ── Hero 安装面板 ── */
        .hero-download {
            padding: 80px 0 60px;
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .hero-badge {
            display: inline-block;
            background: rgba(16, 185, 129, 0.13);
            border: 1px solid rgba(16, 185, 129, 0.3);
            padding: 6px 18px;
            border-radius: 60px;
            font-size: 0.74rem;
            font-weight: 500;
            color: var(--accent-400);
            margin-bottom: 22px;
        }
        .hero h1 {
            font-size: 3.2rem;
            font-weight: 800;
            line-height: 1.16;
            letter-spacing: -0.025em;
            margin-bottom: 18px;
        }
        .hero-gradient {
            background: linear-gradient(135deg, #FFFFFF 18%, #34D399 48%, #14B8A6 88%);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .hero-desc {
            font-size: 1.05rem;
            color: var(--text-secondary);
            margin-bottom: 26px;
            max-width: 460px;
            line-height: 1.65;
        }
        .info-cards-mini {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 24px;
        }
        .info-cards-mini .tag {
            background: rgba(16, 185, 129, 0.08);
            border: 1px solid rgba(16, 185, 129, 0.22);
            padding: 6px 17px;
            border-radius: 28px;
            font-size: 0.76rem;
            color: var(--accent-300);
            white-space: nowrap;
        }

        /* 右侧面板 */
        .panel-card {
            background: rgba(10, 26, 20, 0.5);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border-radius: var(--radius-2xl);
            border: 1px solid rgba(16, 185, 129, 0.2);
            padding: 32px 24px;
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .panel-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            background: rgba(255, 255, 255, 0.02);
            border-radius: 20px;
            border: 1px solid rgba(255, 255, 255, 0.04);
            transition: var(--transition-smooth);
        }
        .panel-item:hover {
            border-color: var(--accent-500);
            background: rgba(16, 185, 129, 0.05);
        }
        .panel-item .pi-icon {
            font-size: 1.6rem;
            min-width: 36px;
            text-align: center;
        }
        .panel-item .pi-text {
            font-size: 0.88rem;
            color: #CBD5E1;
        }
        .panel-item .pi-text strong {
            color: #fff;
            display: block;
            font-size: 0.94rem;
            margin-bottom: 2px;
        }

        /* ── 快速启动方案 ── */
        .quickstart-section {
            padding: 30px 0 50px;
        }
        .quickstart-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
            gap: 24px;
        }
        .quickstart-card {
            background: rgba(10, 26, 20, 0.45);
            border-radius: 28px;
            padding: 32px 24px;
            border: 1px solid rgba(255, 255, 255, 0.05);
            text-decoration: none;
            color: var(--text-primary);
            transition: var(--transition-smooth);
            display: flex;
            flex-direction: column;
            position: relative;
            overflow: hidden;
        }
        .quickstart-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, transparent, var(--accent-500), transparent);
            opacity: 0;
            transition: opacity 0.3s;
        }
        .quickstart-card:hover::before {
            opacity: 1;
        }
        .quickstart-card:hover {
            border-color: var(--accent-500);
            transform: translateY(-4px);
            box-shadow: 0 12px 36px rgba(16, 185, 129, 0.12);
            background: rgba(16, 38, 28, 0.5);
        }
        .quickstart-card .qs-icon {
            font-size: 2.6rem;
            margin-bottom: 16px;
        }
        .quickstart-card h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .quickstart-card p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.5;
            flex: 1;
        }
        .quickstart-card .qs-link {
            display: inline-block;
            margin-top: 14px;
            color: var(--accent-400);
            font-weight: 600;
            font-size: 0.88rem;
            transition: var(--transition-fast);
        }
        .quickstart-card:hover .qs-link {
            color: #A7F3D0;
            text-decoration: underline;
            text-underline-offset: 3px;
        }

        /* ── 跨平台下载卡片（与快速启动方案共用样式） ── */
        .cross-platform-section {
            padding: 20px 0 50px;
            border-top: 1px solid rgba(255, 255, 255, 0.03);
        }

        /* ── FAQ 折叠 ── */
        .faq-section {
            padding: 50px 0 60px;
            border-top: 1px solid rgba(255, 255, 255, 0.03);
        }
        .faq-grid {
            max-width: 800px;
            margin: 0 auto;
        }
        details.faq-item {
            background: rgba(10, 26, 20, 0.4);
            border-radius: 20px;
            margin-bottom: 14px;
            border: 1px solid rgba(255, 255, 255, 0.04);
            transition: var(--transition-smooth);
            overflow: hidden;
        }
        details.faq-item[open] {
            border-color: rgba(16, 185, 129, 0.25);
            background: rgba(16, 38, 28, 0.45);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
        }
        summary.faq-question {
            padding: 20px 24px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            color: #E2E8F0;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: var(--transition-fast);
        }
        summary.faq-question::-webkit-details-marker {
            display: none;
        }
        summary.faq-question::after {
            content: '▸';
            font-size: 1.2rem;
            color: var(--accent-400);
            transition: transform 0.25s;
        }
        details.faq-item[open] summary.faq-question::after {
            transform: rotate(90deg);
            color: var(--accent-300);
        }
        .faq-answer {
            padding: 0 24px 20px;
            font-size: 0.88rem;
            color: #B0B7C3;
            line-height: 1.7;
        }

        /* ── SEO长文底部 ── */
        .seo-content {
            padding: 50px 0 60px;
            border-top: 1px solid rgba(255, 255, 255, 0.03);
            color: #B0B7C3;
            font-size: 0.94rem;
            line-height: 1.85;
        }
        .seo-content h2 {
            font-size: 1.65rem;
            color: #E2E8F0;
            margin: 30px 0 15px;
            font-weight: 700;
        }
        .seo-content h3 {
            font-size: 1.2rem;
            color: #CBD5E1;
            margin: 22px 0 9px;
            font-weight: 600;
        }
        .seo-content p {
            margin-bottom: 13px;
        }
        .seo-content ul {
            margin: 9px 0 14px 20px;
            list-style-type: disc;
        }
        .seo-content ul li {
            margin-bottom: 5px;
        }
        .seo-content strong {
            color: #D1D5DB;
        }
        .seo-content a {
            color: var(--accent-400);
            text-decoration: underline;
            text-underline-offset: 2px;
        }
        .seo-content a:hover {
            color: var(--accent-300);
        }

        /* ── Footer ── */
        footer {
            background: #020806;
            padding: 45px 0 26px;
            border-top: 1px solid rgba(255, 255, 255, 0.02);
            font-size: 0.83rem;
            color: #6B7280;
        }
        .footer-grid {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 32px;
            margin-bottom: 36px;
        }
        .footer-col h4 {
            color: #CBD5E1;
            margin-bottom: 10px;
            font-size: 0.88rem;
            font-weight: 600;
        }
        .footer-col a {
            display: block;
            color: #6B7280;
            text-decoration: none;
            margin-bottom: 5px;
            transition: var(--transition-fast);
            font-size: 0.8rem;
        }
        .footer-col a:hover {
            color: var(--accent-400);
        }
        .footer-bottom {
            text-align: center;
            border-top: 1px solid rgba(255, 255, 255, 0.03);
            padding-top: 18px;
            font-size: 0.76rem;
            color: #4B5563;
        }

        /* ── 响应式 ── */
        @media (max-width: 900px) {
            .hero-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .hero h1 {
                font-size: 2.2rem;
            }
            .nav-links {
                gap: 18px;
                margin-top: 8px;
                width: 100%;
                justify-content: center;
            }
            nav {
                flex-direction: column;
            }
            .quickstart-grid {
                grid-template-columns: 1fr;
            }
            .seo-content {
                font-size: 0.86rem;
            }
        }
        @media (max-width: 500px) {
            .container {
                padding: 0 14px;
            }
            .hero h1 {
                font-size: 1.75rem;
            }
            .info-cards-mini .tag {
                font-size: 0.7rem;
                padding: 4px 12px;
            }
            .panel-card {
                padding: 22px 16px;
            }
            .quickstart-card {
                padding: 24px 18px;
            }
            footer {
                font-size: 0.75rem;
            }
        }