:root {
            --bg-deep: #070a12;
            --bg-surface: #0d1117;
            --bg-card: #131922;
            --bg-card-hover: #1a2232;
            --accent: #3b82f6;
            --accent-glow: #60a5fa;
            --accent-subtle: rgba(59, 130, 246, 0.08);
            --accent-mid: rgba(59, 130, 246, 0.15);
            --text-primary: #e8edf5;
            --text-secondary: #8b97ad;
            --text-muted: #4a5568;
            --border: rgba(255, 255, 255, 0.06);
            --border-accent: rgba(59, 130, 246, 0.25);
            --radius: 12px;
            --radius-lg: 20px;
            --radius-sm: 8px;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'DM Mono', monospace;
            background: var(--bg-deep);
            color: var(--text-primary);
            line-height: 1.7;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

        body::before {
            content: '';
            position: fixed;
            inset: 0;
            background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
            pointer-events: none;
            z-index: 9999;
        }

        h1, h2, h3, h4, h5, h6 {
            font-family: 'Syne', sans-serif;
            line-height: 1.2;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header */
        header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(7, 10, 18, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border);
        }

        header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
        }

        .logo {
            font-family: 'Syne', sans-serif;
            font-weight: 800;
            font-size: 1.2rem;
            letter-spacing: -0.02em;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .logo-icon {
            width: 30px;
            height: 30px;
            background: var(--accent);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 0 20px rgba(59, 130, 246, 0.3);
        }

        .logo-icon svg {
            width: 16px;
            height: 16px;
            fill: white;
        }

        nav { flex-shrink: 0; }
        nav ul {
            display: flex;
            list-style: none;
            gap: 4px;
        }

        nav a {
            display: block;
            padding: 8px 18px;
            font-size: 0.78rem;
            font-weight: 400;
            color: var(--text-secondary);
            border-radius: 8px;
            transition: color 0.2s ease, background 0.2s ease;
            letter-spacing: 0.02em;
            white-space: nowrap;
        }

        nav a:hover,
        nav a[aria-current="page"] {
            color: var(--text-primary);
            background: var(--accent-subtle);
        }

        nav a[aria-current="page"] {
            color: var(--accent-glow);
        }

        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text-primary);
            cursor: pointer;
            padding: 8px;
        }

        /* Hero download */
        .hero-download {
            position: relative;
            padding: 70px 0 60px;
            overflow: hidden;
        }

        .hero-download::before {
            content: '';
            position: absolute;
            top: -200px;
            right: -100px;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(59, 130, 246, 0.06) 0%, transparent 70%);
            pointer-events: none;
        }

        .hero-download .container {
            position: relative;
            z-index: 2;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 40px;
        }

        .hero-dl-content {
            flex: 1;
            max-width: 600px;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 16px;
            background: var(--accent-subtle);
            border: 1px solid var(--border-accent);
            border-radius: 100px;
            font-size: 0.7rem;
            color: var(--accent-glow);
            font-weight: 500;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            margin-bottom: 28px;
            opacity: 0;
            animation: fadeUp 0.6s ease 0.1s forwards;
        }

        .hero-download h1 {
            font-size: clamp(2.2rem, 4.5vw, 3.2rem);
            font-weight: 800;
            letter-spacing: -0.03em;
            line-height: 1.1;
            margin-bottom: 12px;
            opacity: 0;
            animation: fadeUp 0.6s ease 0.2s forwards;
        }

        .hero-download h1 span {
            background: linear-gradient(135deg, var(--accent-glow), #a78bfa);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-dl-desc {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 28px;
            opacity: 0;
            animation: fadeUp 0.6s ease 0.3s forwards;
        }

        .hero-dl-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            margin-bottom: 24px;
            opacity: 0;
            animation: fadeUp 0.6s ease 0.4s forwards;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 30px;
            font-family: 'DM Mono', monospace;
            font-size: 0.8rem;
            font-weight: 500;
            border-radius: 10px;
            border: none;
            cursor: pointer;
            transition: all 0.25s ease;
            letter-spacing: 0.03em;
        }

        .btn-primary {
            background: var(--accent);
            color: white;
            box-shadow: 0 4px 24px rgba(59, 130, 246, 0.3), 0 0 0 1px rgba(59, 130, 246, 0.5);
        }

        .btn-primary:hover {
            background: var(--accent-glow);
            box-shadow: 0 4px 32px rgba(59, 130, 246, 0.45), 0 0 0 1px rgba(96, 165, 250, 0.7);
            transform: translateY(-2px);
        }

        .btn-secondary {
            background: transparent;
            color: var(--text-secondary);
            border: 1px solid var(--border);
        }

        .btn-secondary:hover {
            color: var(--text-primary);
            border-color: var(--text-muted);
            background: rgba(255, 255, 255, 0.03);
            transform: translateY(-2px);
        }

        .btn-github {
            background: #1b1f2b;
            color: #e8edf5;
            border: 1px solid rgba(255, 255, 255, 0.12);
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
        }

        .btn-github:hover {
            background: #242a38;
            border-color: rgba(255, 255, 255, 0.22);
            color: #fff;
            transform: translateY(-2px);
        }

        .dl-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            font-size: 0.7rem;
            color: var(--text-muted);
            letter-spacing: 0.03em;
            opacity: 0;
            animation: fadeUp 0.6s ease 0.5s forwards;
        }

        .hero-dl-visual {
            flex: 0 0 340px;
            opacity: 0;
            animation: fadeUp 0.8s ease 0.5s forwards;
        }

        .dl-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 32px 24px;
            text-align: center;
        }

        .dl-card-icon {
            width: 56px;
            height: 56px;
            margin: 0 auto 18px;
            background: linear-gradient(135deg, var(--accent), #a78bfa);
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 8px 32px rgba(59, 130, 246, 0.25);
        }

        .dl-card-icon svg {
            width: 26px;
            height: 26px;
            fill: white;
        }

        .dl-card h3 {
            font-size: 1rem;
            margin-bottom: 6px;
        }

        .dl-card p {
            font-size: 0.73rem;
            color: var(--text-secondary);
        }

        .dl-card-progress {
            margin-top: 18px;
            height: 4px;
            background: rgba(255,255,255,0.05);
            border-radius: 4px;
            overflow: hidden;
        }

        .dl-card-progress span {
            display: block;
            width: 67%;
            height: 100%;
            background: var(--accent);
            border-radius: 4px;
            animation: progressPulse 2s ease-in-out infinite;
        }

        @keyframes progressPulse {
            0%,100% { opacity: 1; }
            50% { opacity: 0.6; }
        }

        /* 安装步骤 */
        .install-steps {
            padding: 80px 0 40px;
        }

        .section-header {
            text-align: center;
            margin-bottom: 60px;
        }

        .section-tag {
            display: inline-block;
            font-size: 0.68rem;
            font-weight: 500;
            color: var(--accent-glow);
            text-transform: uppercase;
            letter-spacing: 0.15em;
            margin-bottom: 16px;
            padding: 4px 14px;
            background: var(--accent-subtle);
            border-radius: 100px;
            border: 1px solid var(--border-accent);
        }

        .section-header h2 {
            font-size: clamp(1.8rem, 3.5vw, 2.4rem);
            font-weight: 800;
            letter-spacing: -0.03em;
            margin-bottom: 14px;
        }

        .section-header p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            max-width: 500px;
            margin: 0 auto;
            line-height: 1.8;
        }

        .steps-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 18px;
        }

        .step-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 32px 24px;
            position: relative;
            transition: all 0.35s ease;
            opacity: 0;
            transform: translateY(20px);
        }

        .step-card.visible {
            opacity: 1;
            transform: translateY(0);
        }

        .step-card:hover {
            background: var(--bg-card-hover);
            border-color: var(--border-accent);
            transform: translateY(-4px);
            box-shadow: 0 12px 32px rgba(0,0,0,0.3);
        }

        .step-number {
            font-family: 'Syne', sans-serif;
            font-size: 2rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--accent), #a78bfa);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 12px;
            opacity: 0.3;
        }

        .step-card h4 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .step-card p {
            font-size: 0.76rem;
            color: var(--text-secondary);
            line-height: 1.75;
        }

        /* 系统要求 */
        .system-req {
            padding: 60px 0;
        }

        .req-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }

        .req-item {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 22px 18px;
            text-align: center;
            transition: background 0.3s;
        }

        .req-item:hover {
            background: var(--bg-card-hover);
            border-color: var(--border-accent);
        }

        .req-item strong {
            display: block;
            font-family: 'Syne', sans-serif;
            font-size: 1.1rem;
            margin-bottom: 6px;
            color: var(--accent-glow);
        }

        .req-item span {
            font-size: 0.7rem;
            color: var(--text-muted);
            letter-spacing: 0.03em;
        }

        /* GitHub 区块 */
        .github-section {
            padding: 40px 0 60px;
        }

        .github-banner {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 44px 36px;
            display: flex;
            align-items: center;
            gap: 36px;
            transition: all 0.35s ease;
        }

        .github-banner:hover {
            border-color: rgba(255,255,255,0.12);
            box-shadow: 0 8px 36px rgba(0,0,0,0.25);
            transform: translateY(-2px);
        }

        .github-icon-wrap {
            flex-shrink: 0;
            width: 60px;
            height: 60px;
            background: #1b1f2b;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1px solid rgba(255,255,255,0.1);
        }

        .github-icon-wrap svg {
            width: 28px;
            height: 28px;
            fill: #e8edf5;
        }

        .github-info h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 6px;
        }

        .github-info p {
            font-size: 0.78rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* FAQ */
        .faq-section {
            padding: 60px 0 80px;
        }

        .faq-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
            max-width: 900px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 22px 20px;
            transition: background 0.3s;
        }

        .faq-item:hover {
            background: var(--bg-card-hover);
        }

        .faq-item h4 {
            font-size: 0.9rem;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .faq-item p {
            font-size: 0.74rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* Footer */
        footer {
            border-top: 1px solid var(--border);
            padding: 40px 0;
        }

        footer .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 20px;
        }

        footer .logo { font-size: 1rem; }
        footer nav a { font-size: 0.76rem; padding: 6px 14px; }

        footer p.copyright {
            font-size: 0.7rem;
            color: var(--text-muted);
            width: 100%;
            text-align: center;
            margin-top: 20px;
            padding-top: 20px;
            border-top: 1px solid var(--border);
        }

        @keyframes fadeUp {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        @media (max-width: 1024px) {
            .hero-download .container { flex-direction: column; text-align: center; }
            .hero-dl-content { max-width: 100%; }
            .dl-meta { justify-content: center; }
            .steps-grid { grid-template-columns: repeat(2, 1fr); }
            .req-grid { grid-template-columns: repeat(2, 1fr); }
            .github-banner { flex-direction: column; text-align: center; }
            .faq-grid { grid-template-columns: 1fr; }
        }

        @media (max-width: 768px) {
            .mobile-toggle { display: block; }
            nav {
                display: none;
                position: absolute;
                top: 64px;
                left: 0;
                right: 0;
                background: rgba(7, 10, 18, 0.96);
                backdrop-filter: blur(20px);
                border-bottom: 1px solid var(--border);
                padding: 12px 24px;
            }
            nav.open { display: block; }
            nav ul { flex-direction: column; gap: 2px; }
            nav a { padding: 12px 16px; }
            .steps-grid { grid-template-columns: 1fr; }
            .req-grid { grid-template-columns: 1fr; }
        }

        @media (max-width: 480px) {
            .hero-dl-visual { display: none; }
        }