:root {
            --bg: #060d1a;
            --bg-elevated: #0c1525;
            --bg-card: #111b2e;
            --bg-card-hover: #182538;
            --border: rgba(255, 255, 255, 0.05);
            --border-strong: rgba(255, 255, 255, 0.10);
            --electric: #5b8def;
            --electric-light: #80b5ff;
            --electric-soft: rgba(91, 141, 239, 0.12);
            --electric-glow: rgba(91, 141, 239, 0.06);
            --cyan: #3dd6c8;
            --cyan-soft: rgba(61, 214, 200, 0.12);
            --purple: #8b6fdf;
            --purple-soft: rgba(139, 111, 223, 0.12);
            --text: #e4e8f0;
            --text-secondary: #9ba0b0;
            --text-muted: #6b7080;
            --font-display: 'Instrument Serif', Georgia, 'Times New Roman', serif;
            --font-body: 'Source Serif 4', Georgia, 'Times New Roman', serif;
            --font-mono: 'DM Mono', 'Courier New', monospace;
            --font-sans: system-ui, -apple-system, 'Segoe UI', sans-serif;
        }
        *,
        *::before,
        *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-body);
            background: var(--bg);
            color: var(--text);
            line-height: 1.75;
            overflow-x: hidden;
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body::before {
            content: '';
            position: fixed;
            inset: 0;
            background: radial-gradient(ellipse at 70% 20%, rgba(91, 141, 239, 0.04) 0%, transparent 55%),
                radial-gradient(ellipse at 25% 60%, rgba(139, 111, 223, 0.03) 0%, transparent 50%),
                radial-gradient(ellipse at 60% 85%, rgba(61, 214, 200, 0.03) 0%, transparent 45%);
            pointer-events: none;
            z-index: 0;
        }
        a {
            color: inherit;
            text-decoration: none;
        }
        ul {
            list-style: none;
        }
        .container {
            max-width: 1180px;
            margin: 0 auto;
            padding: 0 2.5rem;
        }
        .skip-link {
            position: absolute;
            top: -100px;
            left: 1rem;
            z-index: 200;
            background: var(--electric);
            color: #fff;
            padding: 0.5rem 1rem;
            border-radius: 0 0 6px 6px;
            font-family: var(--font-sans);
            font-size: 0.85rem;
            transition: top 0.3s;
        }
        .skip-link:focus {
            top: 0;
        }

        /* Header */
        header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(6, 13, 26, 0.88);
            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: 66px;
            gap: 1rem;
        }
        .logo {
            flex-shrink: 0;
            display: flex;
            align-items: center;
        }
        .logo-img {
            height: 2rem;
            width: auto;
        }
        .site-nav ul {
            display: flex;
            gap: 0.2rem;
            flex-wrap: wrap;
        }
        .site-nav a {
            font-family: var(--font-mono);
            font-size: 0.74rem;
            color: var(--text-muted);
            padding: 0.4rem 0.85rem;
            border-radius: 6px;
            transition: all 0.22s ease;
            letter-spacing: 0.02em;
            white-space: nowrap;
        }
        .site-nav a:hover {
            color: var(--text);
            background: rgba(255, 255, 255, 0.03);
        }
        .site-nav a[aria-current="page"] {
            color: var(--electric);
            background: var(--electric-soft);
        }
        main {
            position: relative;
            z-index: 1;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.7rem 1.5rem;
            border-radius: 6px;
            font-family: var(--font-mono);
            font-size: 0.78rem;
            font-weight: 500;
            cursor: pointer;
            border: none;
            transition: all 0.25s ease;
            letter-spacing: 0.03em;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--electric);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--electric-light);
            transform: translateY(-1px);
            box-shadow: 0 8px 28px rgba(91, 141, 239, 0.25);
        }
        .btn-outline {
            background: transparent;
            color: var(--text-secondary);
            border: 1px solid var(--border-strong);
        }
        .btn-outline:hover {
            border-color: var(--electric);
            color: var(--electric);
            transform: translateY(-1px);
        }
        .btn-sm {
            padding: 0.4rem 0.95rem;
            font-size: 0.66rem;
            letter-spacing: 0.04em;
        }

        /* Page hero */
        .page-hero {
            padding: 4rem 0 2.5rem;
            text-align: center;
            position: relative;
        }
        .page-hero h1 {
            font-family: var(--font-display);
            font-size: clamp(2.8rem, 5vw, 4rem);
            font-weight: 400;
            line-height: 1.15;
            color: var(--text);
            letter-spacing: -0.02em;
            margin-bottom: 0.8rem;
        }
        .page-hero h1 em {
            font-style: italic;
            color: var(--electric);
        }
        .page-hero p {
            font-size: 1rem;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto 1.5rem;
            line-height: 1.7;
        }
        .highlight-badge {
            display: inline-block;
            font-family: var(--font-mono);
            font-size: 0.65rem;
            background: var(--electric-soft);
            color: var(--electric);
            padding: 0.2rem 0.7rem;
            border-radius: 4px;
            letter-spacing: 0.05em;
            margin-bottom: 1rem;
        }

        /* Download grid */
        .download-section {
            padding: 2rem 0 5rem;
        }
        .platform-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
            gap: 1.2rem;
            margin-bottom: 3rem;
        }
        .platform-card {
            background: var(--bg-elevated);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 1.8rem 1.5rem;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
            display: flex;
            flex-direction: column;
        }
        .platform-card:hover {
            border-color: var(--electric);
            transform: translateY(-3px);
            box-shadow: 0 14px 35px rgba(0, 0, 0, 0.45);
        }
        .platform-icon {
            font-size: 2.2rem;
            margin-bottom: 0.8rem;
            display: block;
        }
        .platform-card h3 {
            font-family: var(--font-display);
            font-size: 1.2rem;
            font-weight: 400;
            color: var(--text);
            margin-bottom: 0.25rem;
            letter-spacing: -0.01em;
        }
        .platform-card .client-name {
            font-family: var(--font-mono);
            font-size: 0.7rem;
            color: var(--electric);
            margin-bottom: 0.6rem;
            display: block;
        }
        .platform-card p {
            font-size: 0.82rem;
            color: var(--text-secondary);
            line-height: 1.65;
            margin-bottom: 1.2rem;
            flex: 1;
        }
        .platform-card .btn-sm {
            align-self: flex-start;
            display: inline-flex;
            background: transparent;
            border: 1px solid var(--border-strong);
            color: var(--text-secondary);
            border-radius: 5px;
            font-family: var(--font-mono);
            font-size: 0.64rem;
            padding: 0.38rem 0.85rem;
            cursor: pointer;
            transition: all 0.25s ease;
            letter-spacing: 0.03em;
        }
        .platform-card .btn-sm:hover {
            border-color: var(--electric);
            color: var(--electric);
            background: var(--electric-soft);
        }
        .platform-badge {
            position: absolute;
            top: 12px;
            right: 12px;
            font-family: var(--font-mono);
            font-size: 0.55rem;
            background: var(--cyan-soft);
            color: var(--cyan);
            padding: 0.15rem 0.5rem;
            border-radius: 3px;
            letter-spacing: 0.04em;
        }

        /* Features strip */
        .features-strip {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1rem;
            margin-bottom: 4rem;
        }
        .feature-item {
            background: var(--bg-elevated);
            border: 1px solid var(--border);
            border-radius: 10px;
            padding: 1.5rem 1.2rem;
            text-align: center;
            transition: background 0.25s;
        }
        .feature-item:hover {
            background: var(--bg-card-hover);
        }
        .feature-item .feature-icon {
            font-size: 1.6rem;
            margin-bottom: 0.5rem;
        }
        .feature-item h4 {
            font-family: var(--font-display);
            font-size: 1rem;
            font-weight: 400;
            color: var(--text);
            margin-bottom: 0.3rem;
        }
        .feature-item p {
            font-size: 0.78rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* Quick guide */
        .quick-guide {
            background: var(--bg-elevated);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 2rem;
            margin-bottom: 4rem;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            align-items: center;
        }
        .quick-guide h2 {
            font-family: var(--font-display);
            font-size: 1.6rem;
            font-weight: 400;
            color: var(--text);
            margin-bottom: 0.6rem;
            letter-spacing: -0.01em;
        }
        .quick-guide p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.75;
        }
        .quick-guide .btn {
            justify-self: end;
        }

        /* Footer */
        footer {
            border-top: 1px solid var(--border);
            padding: 3rem 0;
            position: relative;
            z-index: 1;
        }
        footer .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 1.5rem;
        }
        .footer-left {
            display: flex;
            align-items: center;
            gap: 2rem;
            flex-wrap: wrap;
        }
        .footer-logo {
            font-family: var(--font-display);
            font-size: 1.05rem;
            color: var(--text);
        }
        .footer-logo em {
            color: var(--electric);
            font-style: italic;
        }
        .footer-copy {
            font-family: var(--font-mono);
            font-size: 0.68rem;
            color: var(--text-muted);
        }
        .footer-links {
            display: flex;
            gap: 1.6rem;
            flex-wrap: wrap;
        }
        .footer-links a {
            font-family: var(--font-mono);
            font-size: 0.7rem;
            color: var(--text-muted);
            transition: color 0.2s ease;
        }
        .footer-links a:hover {
            color: var(--electric);
        }

        @media (max-width: 900px) {
            .features-strip {
                grid-template-columns: 1fr 1fr;
            }
            .quick-guide {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .quick-guide .btn {
                justify-self: center;
            }
        }
        @media (max-width: 600px) {
            .container {
                padding: 0 1rem;
            }
            header .container {
                flex-direction: column;
                height: auto;
                padding-top: 0.6rem;
                padding-bottom: 0.6rem;
                gap: 0.3rem;
            }
            .site-nav a {
                font-size: 0.65rem;
                padding: 0.28rem 0.45rem;
            }
            .page-hero h1 {
                font-size: 2rem;
            }
            .platform-grid {
                grid-template-columns: 1fr;
            }
            .features-strip {
                grid-template-columns: 1fr;
            }
            footer .container {
                flex-direction: column;
                text-align: center;
            }
            .footer-left {
                flex-direction: column;
                gap: 0.3rem;
            }
            .footer-links {
                justify-content: center;
                gap: 1rem;
            }
        }
		 .logo {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    gap: 0.55rem;
    text-decoration: none;
}

.logo-img {
    height: 2.2rem;
    width: auto;
    display: block;
    flex-shrink: 0;
}

.logo-text {
    display: flex;
    align-items: baseline;
}

.logo-text .brand {
    font-family: var(--font-display);
    font-size: 1.45rem;
    color: var(--text);
    letter-spacing: -0.01em;
    line-height: 1;
}

/* 可选：为文字添加品牌色点缀 */
.logo-text .brand::after {
    content: '.';
    color: var(--electric);
    font-style: italic;
    margin-left: 1px;
}

/* hover 微交互 */
.logo:hover .logo-text .brand {
    color: var(--electric-light);
    transition: color 0.25s ease;
}

.logo:hover .logo-img {
    opacity: 0.9;
    transition: opacity 0.25s ease;
}