:root {
            --bg-dark: #070f1e;
            --bg-card: #0d1b2a;
            --primary: #1e6091;
            --accent: #1883ff;
            --accent-glow: rgba(24, 131, 255, 0.35);
            --text-main: #ffffff;
            --text-muted: #8da9c4;
            --border-subtle: rgba(24, 131, 255, 0.1);
            --border-glow: rgba(24, 131, 255, 0.25);
            --accent-green: #00b4d8;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --radius-full: 50px;
            --shadow-card: 0 8px 28px rgba(0, 0, 0, 0.5);
            --shadow-glow: 0 0 28px rgba(24, 131, 255, 0.25);
            --transition-fast: 0.2s ease;
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-dark);
            color: var(--text-main);
            line-height: 1.7;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition-fast);
        }
        header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(7, 15, 30, 0.88);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-subtle);
            transition: var(--transition-smooth);
        }
        header.scrolled {
            background: rgba(7, 15, 30, 0.96);
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.5);
        }
        .nav-container {
            max-width: 1240px;
            margin: 0 auto;
            padding: 16px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-size: 24px;
            font-weight: 800;
            color: var(--text-main);
            display: flex;
            align-items: center;
            gap: 10px;
            letter-spacing: -0.5px;
        }
        .logo svg {
            width: 30px;
            height: 30px;
            fill: none;
            stroke: var(--accent);
            stroke-width: 2.6;
            stroke-linecap: round;
            stroke-linejoin: round;
        }
        .logo span {
            color: var(--accent);
        }
        nav {
            display: flex;
            gap: 36px;
            align-items: center;
        }
        nav a {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-muted);
            position: relative;
            padding: 4px 0;
        }
        nav a::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
            transition: width var(--transition-smooth);
        }
        nav a:hover,
        nav a.active {
            color: var(--text-main);
        }
        nav a:hover::after,
        nav a.active::after {
            width: 100%;
        }
        .nav-right {
            display: flex;
            align-items: center;
            gap: 18px;
        }
        .btn-login {
            background: var(--accent);
            padding: 10px 26px;
            border-radius: var(--radius-full);
            font-size: 14px;
            font-weight: 600;
            white-space: nowrap;
            transition: var(--transition-smooth);
        }
        .btn-login:hover {
            box-shadow: var(--shadow-glow);
            transform: translateY(-1px);
        }
        .menu-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
        }
        .menu-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text-main);
            margin: 6px 0;
            border-radius: 2px;
        }
        .download-hero {
            padding: 170px 24px 50px;
            max-width: 1240px;
            margin: 0 auto;
            text-align: center;
        }
        .download-hero h1 {
            font-size: 48px;
            font-weight: 800;
            letter-spacing: -0.5px;
            margin-bottom: 20px;
            background: linear-gradient(180deg, #ffffff 0%, #c8ddf8 100%);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .download-hero p {
            font-size: 18px;
            color: var(--text-muted);
            max-width: 750px;
            margin: 0 auto 40px;
        }
        .matrix-container {
            max-width: 1240px;
            margin: 0 auto 100px;
            padding: 0 24px;
        }
        .main-windows-card {
            background: linear-gradient(135deg, rgba(13, 27, 42, 0.9) 0%, rgba(7, 15, 30, 0.9) 100%);
            border: 2px solid var(--accent);
            border-radius: var(--radius-xl);
            padding: 50px;
            margin-bottom: 40px;
            position: relative;
            overflow: hidden;
            box-shadow: 0 10px 40px rgba(24, 131, 255, 0.15);
        }
        .main-windows-card::before {
            content: "主力推荐";
            position: absolute;
            top: 25px;
            right: -35px;
            background: var(--accent);
            color: #fff;
            font-size: 12px;
            font-weight: 700;
            padding: 8px 40px;
            transform: rotate(45deg);
            letter-spacing: 1px;
        }
        .windows-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 40px;
            align-items: center;
        }
        .windows-info h2 {
            font-size: 32px;
            font-weight: 800;
            margin-bottom: 15px;
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .windows-info p {
            color: var(--text-muted);
            font-size: 15px;
            margin-bottom: 25px;
        }
        .meta-list {
            list-style: none;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
            font-size: 13px;
            color: var(--text-muted);
        }
        .meta-list li span {
            color: var(--text-main);
            font-weight: 600;
        }
        .windows-action {
            text-align: center;
        }
        .btn-windows-download {
            background: var(--accent);
            color: var(--text-main);
            font-size: 20px;
            font-weight: 700;
            padding: 20px 45px;
            border-radius: 12px;
            display: inline-block;
            width: 100%;
            box-shadow: 0 4px 20px rgba(24, 131, 255, 0.3);
            transition: var(--transition-smooth);
        }
        .btn-windows-download:hover {
            background: #258fff;
            transform: translateY(-2px);
            box-shadow: 0 6px 25px rgba(24, 131, 255, 0.5);
        }
        .sub-platforms-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 25px;
        }
        .platform-card {
            background: rgba(13, 27, 42, 0.4);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 35px 30px;
            text-align: center;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            transition: var(--transition-smooth);
        }
        .platform-card:hover {
            border-color: var(--border-glow);
            background: rgba(13, 27, 42, 0.6);
            transform: translateY(-3px);
        }
        .platform-card h3 {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .platform-card p {
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 25px;
            min-height: 40px;
        }
        .btn-sub-download {
            border: 1px solid var(--accent);
            color: var(--text-main);
            padding: 12px 25px;
            border-radius: 8px;
            font-size: 14px;
            font-weight: 600;
            display: block;
            transition: var(--transition-smooth);
        }
        .btn-sub-download:hover {
            background: rgba(24, 131, 255, 0.1);
            border-color: var(--text-main);
        }
        .checksum-section {
            max-width: 1240px;
            margin: 0 auto 100px;
            padding: 0 24px;
        }
        .checksum-box {
            background: rgba(13, 27, 42, 0.2);
            border: 1px dashed var(--border-subtle);
            border-radius: 12px;
            padding: 30px;
        }
        .checksum-box h4 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 15px;
            color: var(--accent-green);
        }
        .hash-code {
            font-family: "Courier New", Courier, monospace;
            font-size: 13px;
            color: var(--text-muted);
            word-break: break-all;
            background: #040810;
            padding: 15px;
            border-radius: 6px;
            border: 1px solid rgba(255,255,255,0.05);
        }
        .info-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-top: 40px;
        }
        .info-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 28px;
        }
        .info-card h5 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .info-card p {
            font-size: 14px;
            color: var(--text-muted);
        }
		    .timeline-item:hover {
        border-color: var(--border-glow) !important;
        transform: translateX(6px);
        box-shadow: 0 8px 30px rgba(0,0,0,0.4);
    }
    @media (max-width: 768px) {
        .timeline-wrapper {
            padding-left: 40px !important;
        }
        .timeline-item > div[style*="display:grid"] {
            grid-template-columns: 1fr !important;
        }
        .timeline-item {
            padding: 20px 16px !important;
        }
    }
        footer {
            background: #040810;
            padding: 56px 24px 36px;
            border-top: 1px solid rgba(24, 131, 255, 0.06);
            font-size: 14px;
            color: var(--text-muted);
        }
        .footer-container {
            max-width: 1240px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            margin-bottom: 40px;
            gap: 40px;
            flex-wrap: wrap;
        }
        .footer-info p {
            margin-top: 10px;
            max-width: 300px;
        }
        .footer-links {
            display: flex;
            gap: 70px;
            flex-wrap: wrap;
        }
        .footer-column h4 {
            color: var(--text-main);
            margin-bottom: 18px;
        }
        .footer-column li {
            margin-bottom: 10px;
        }
        .footer-bottom {
            max-width: 1240px;
            margin: 0 auto;
            padding-top: 28px;
            border-top: 1px solid rgba(255, 255, 255, 0.04);
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 10px;
        }
        @media (max-width: 968px) {
            .nav-container { padding: 15px; }
            nav, .nav-right { display: none; }
            .menu-toggle { display: block; }
            nav.open, .nav-right.open { display: flex; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0; background: rgba(7,15,30,0.97); padding: 24px; gap: 16px; border-bottom: 1px solid var(--border-subtle); z-index: 999; }
            .windows-grid { grid-template-columns: 1fr; gap: 30px; }
            .sub-platforms-grid { grid-template-columns: 1fr; gap: 20px; }
            .info-grid { grid-template-columns: 1fr; }
            .footer-container { flex-direction: column; }
            .download-hero h1 { font-size: 34px; }
        }