:root {
            --bg-dark: #070f1e;
            --bg-card: #0d1b2a;
            --bg-card-hover: #101d30;
            --primary: #1e6091;
            --accent: #1883ff;
            --accent-glow: rgba(24, 131, 255, 0.35);
            --accent-soft: rgba(24, 131, 255, 0.08);
            --accent-green: #00b4d8;
            --accent-green-glow: rgba(0, 180, 216, 0.3);
            --text-main: #ffffff;
            --text-muted: #8da9c4;
            --text-dim: #6b8399;
            --border-subtle: rgba(24, 131, 255, 0.1);
            --border-glow: rgba(24, 131, 255, 0.25);
            --border-medium: rgba(24, 131, 255, 0.18);
            --radius-sm: 10px;
            --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);
            --shadow-glow-lg: 0 0 45px rgba(24, 131, 255, 0.35);
            --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;
            -moz-osx-font-smoothing: grayscale;
        }
        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);
        }
        ul {
            list-style: none;
        }

        /* Skip link */
        .skip-link {
            position: absolute;
            top: -100px;
            left: 20px;
            background: var(--accent);
            color: #fff;
            padding: 10px 20px;
            border-radius: 0 0 8px 8px;
            z-index: 10000;
            font-size: 14px;
            font-weight: 600;
            transition: top 0.3s;
        }
        .skip-link:focus {
            top: 0;
        }

        /* Header - 与首页完全一致 */
        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);
            color: #fff;
        }
        .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;
            transition: var(--transition-smooth);
        }

        /* Download Hero */
        .download-hero {
            padding: 170px 24px 40px;
            max-width: 1240px;
            margin: 0 auto;
            text-align: center;
            position: relative;
        }
        .download-hero::before {
            content: '';
            position: absolute;
            top: 60px;
            left: 50%;
            transform: translateX(-50%);
            width: 500px;
            height: 500px;
            background: radial-gradient(circle at center, rgba(24, 131, 255, 0.06) 0%, transparent 70%);
            pointer-events: none;
            z-index: 0;
            border-radius: 50%;
        }
        .download-hero>* {
            position: relative;
            z-index: 1;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(24, 131, 255, 0.1);
            border: 1px solid var(--border-glow);
            padding: 7px 18px;
            border-radius: var(--radius-full);
            font-size: 12px;
            color: var(--accent);
            font-weight: 500;
            margin-bottom: 24px;
            letter-spacing: 0.3px;
            animation: pulseBadge 3s ease-in-out infinite;
        }
        @keyframes pulseBadge {
            0%,
            100% {
                box-shadow: 0 0 0 0 rgba(24, 131, 255, 0.25);
            }
            50% {
                box-shadow: 0 0 0 14px rgba(24, 131, 255, 0);
            }
        }
        .hero-badge .dot {
            width: 8px;
            height: 8px;
            background: #34d399;
            border-radius: 50%;
            animation: blinkDot 2s ease-in-out infinite;
        }
        @keyframes blinkDot {
            0%,
            100% {
                opacity: 1;
            }
            50% {
                opacity: 0.3;
            }
        }
        .download-hero h1 {
            font-size: clamp(32px, 5vw, 50px);
            font-weight: 800;
            letter-spacing: -0.8px;
            margin-bottom: 16px;
            line-height: 1.18;
            background: linear-gradient(180deg, #ffffff 0%, #c8ddf8 100%);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .download-hero h1 .highlight {
            background: linear-gradient(135deg, var(--accent) 0%, #5db8ff 100%);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .download-hero>p {
            font-size: 17px;
            color: var(--text-muted);
            max-width: 680px;
            margin: 0 auto 32px;
            line-height: 1.75;
        }
        .quick-stats-row {
            display: flex;
            justify-content: center;
            gap: 40px;
            flex-wrap: wrap;
            font-size: 13px;
            color: var(--text-dim);
        }
        .quick-stats-row span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .quick-stats-row .stat-val {
            color: var(--accent-green);
            font-weight: 700;
            font-size: 16px;
        }

        /* Main Content Container */
        .matrix-container {
            max-width: 1240px;
            margin: 0 auto 80px;
            padding: 0 24px;
        }

        /* Windows 主力推荐卡片 */
        .main-windows-card {
            background: linear-gradient(145deg, rgba(13, 27, 42, 0.92) 0%, rgba(7, 15, 30, 0.92) 100%);
            border: 2px solid var(--accent);
            border-radius: var(--radius-xl);
            padding: 48px 44px;
            margin-bottom: 36px;
            position: relative;
            overflow: hidden;
            box-shadow: 0 10px 40px rgba(24, 131, 255, 0.12);
            transition: var(--transition-smooth);
        }
        .main-windows-card:hover {
            box-shadow: 0 14px 50px rgba(24, 131, 255, 0.2);
            border-color: #258fff;
        }
        .main-windows-card::before {
            content: "主力推荐";
            position: absolute;
            top: 24px;
            right: -36px;
            background: var(--accent);
            color: #fff;
            font-size: 11px;
            font-weight: 700;
            padding: 7px 42px;
            transform: rotate(45deg);
            letter-spacing: 1.5px;
            z-index: 2;
            box-shadow: 0 2px 12px rgba(24, 131, 255, 0.3);
        }
        .windows-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 40px;
            align-items: center;
        }
        .windows-info h2 {
            font-size: 30px;
            font-weight: 800;
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 12px;
            letter-spacing: -0.4px;
        }
        .windows-info h2 .win-icon {
            font-size: 34px;
        }
        .windows-info>p {
            color: var(--text-muted);
            font-size: 14.5px;
            margin-bottom: 20px;
            line-height: 1.7;
        }
        .meta-list {
            list-style: none;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 10px 16px;
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 10px;
        }
        .meta-list li span {
            color: var(--text-main);
            font-weight: 600;
        }
        .meta-list li .tag-new {
            display: inline-block;
            background: var(--accent-green);
            color: #000;
            font-size: 10px;
            font-weight: 700;
            padding: 2px 8px;
            border-radius: 4px;
            margin-left: 6px;
            letter-spacing: 0.5px;
            vertical-align: middle;
        }
        .windows-action {
            text-align: center;
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .btn-windows-download {
            background: var(--accent);
            color: #fff;
            font-size: 19px;
            font-weight: 700;
            padding: 18px 40px;
            border-radius: 12px;
            display: inline-block;
            width: 100%;
            box-shadow: 0 4px 22px rgba(24, 131, 255, 0.3);
            transition: var(--transition-smooth);
            letter-spacing: 0.3px;
            text-align: center;
        }
        .btn-windows-download:hover {
            background: #258fff;
            transform: translateY(-3px);
            box-shadow: 0 8px 32px rgba(24, 131, 255, 0.5);
        }
        .btn-windows-download .arrow-icon {
            display: inline-block;
            margin-left: 6px;
            transition: transform var(--transition-fast);
        }
        .btn-windows-download:hover .arrow-icon {
            transform: translateY(2px);
        }
        .version-note {
            font-size: 12px;
            color: var(--text-dim);
            letter-spacing: 0.2px;
        }
        .version-note a {
            color: var(--accent-green);
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .version-note a:hover {
            color: #00d4f0;
        }

        /* 其他平台下载网格 */
        .sub-platforms-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 22px;
            margin-bottom: 50px;
        }
        .platform-card {
            background: rgba(13, 27, 42, 0.45);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 32px 28px 28px;
            text-align: center;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }
        .platform-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, transparent, var(--accent-green), transparent);
            opacity: 0;
            transition: opacity var(--transition-smooth);
        }
        .platform-card:hover {
            border-color: var(--border-glow);
            background: rgba(13, 27, 42, 0.65);
            transform: translateY(-4px);
            box-shadow: var(--shadow-card);
        }
        .platform-card:hover::before {
            opacity: 1;
        }
        .platform-card .plat-icon {
            font-size: 40px;
            margin-bottom: 12px;
            display: block;
        }
        .platform-card h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 8px;
            letter-spacing: -0.2px;
        }
        .platform-card .plat-version {
            font-size: 12px;
            color: var(--accent-green);
            font-weight: 500;
            margin-bottom: 6px;
        }
        .platform-card p {
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 20px;
            min-height: 36px;
            line-height: 1.6;
        }
        .btn-sub-download {
            border: 1.5px solid var(--accent);
            color: var(--text-main);
            padding: 11px 22px;
            border-radius: 8px;
            font-size: 14px;
            font-weight: 600;
            display: block;
            transition: var(--transition-smooth);
            letter-spacing: 0.2px;
            background: transparent;
            cursor: pointer;
        }
        .btn-sub-download:hover {
            background: rgba(24, 131, 255, 0.12);
            border-color: #fff;
            box-shadow: 0 0 20px rgba(24, 131, 255, 0.15);
        }
        .btn-sub-download .dl-size {
            font-weight: 400;
            font-size: 11px;
            color: var(--text-dim);
            display: block;
            margin-top: 2px;
        }

        /* 校验与安全信息 */
        .checksum-section {
            max-width: 1240px;
            margin: 0 auto 70px;
            padding: 0 24px;
        }
        .checksum-box {
            background: rgba(13, 27, 42, 0.25);
            border: 1px dashed var(--border-medium);
            border-radius: 12px;
            padding: 28px 32px;
            transition: var(--transition-smooth);
        }
        .checksum-box:hover {
            border-color: var(--border-glow);
            background: rgba(13, 27, 42, 0.4);
        }
        .checksum-box h4 {
            font-size: 15px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--accent-green);
            letter-spacing: 0.3px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .hash-code {
            font-family: "SF Mono", "Cascadia Code", "Courier New", Courier, monospace;
            font-size: 12px;
            color: var(--text-muted);
            word-break: break-all;
            background: #040810;
            padding: 14px 18px;
            border-radius: 6px;
            border: 1px solid rgba(255, 255, 255, 0.05);
            letter-spacing: 0.2px;
            line-height: 1.6;
        }
        .checksum-box .verify-tip {
            font-size: 12px;
            color: var(--text-dim);
            margin-top: 10px;
            line-height: 1.6;
        }
        .checksum-box .verify-tip code {
            background: rgba(24, 131, 255, 0.1);
            padding: 2px 7px;
            border-radius: 4px;
            font-family: "SF Mono", "Courier New", monospace;
            font-size: 11px;
            color: var(--accent-green);
        }

        /* 信息卡片网格 */
        .info-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 22px;
            margin-top: 36px;
        }
        .info-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 26px 24px;
            transition: var(--transition-smooth);
        }
        .info-card:hover {
            border-color: var(--border-glow);
            transform: translateY(-2px);
            box-shadow: var(--shadow-card);
        }
        .info-card h5 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 8px;
            letter-spacing: -0.2px;
        }
        .info-card p {
            font-size: 13.5px;
            color: var(--text-muted);
            line-height: 1.7;
        }
        .info-card .card-icon-sm {
            font-size: 28px;
            display: block;
            margin-bottom: 10px;
        }

        /* 版本时间线 */
        .timeline-section {
            max-width: 1240px;
            margin: 0 auto 80px;
            padding: 0 24px;
        }
        .section-header {
            text-align: center;
            margin-bottom: 44px;
        }
        .section-tag {
            display: inline-block;
            font-size: 11px;
            font-weight: 700;
            letter-spacing: 2.5px;
            text-transform: uppercase;
            color: var(--accent);
            margin-bottom: 10px;
            background: rgba(24, 131, 255, 0.08);
            padding: 5px 14px;
            border-radius: var(--radius-full);
        }
        .section-title {
            font-size: clamp(26px, 3.5vw, 36px);
            font-weight: 800;
            margin-bottom: 12px;
            letter-spacing: -0.6px;
            line-height: 1.3;
        }
        .section-desc {
            font-size: 15px;
            color: var(--text-muted);
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.7;
        }
        .timeline-wrapper {
            position: relative;
            padding-left: 52px;
        }
        .timeline-wrapper::before {
            content: '';
            position: absolute;
            left: 18px;
            top: 0;
            bottom: 0;
            width: 2px;
            background: linear-gradient(180deg, var(--accent) 0%, var(--border-subtle) 60%, transparent 100%);
            border-radius: 1px;
        }
        .timeline-item {
            background: rgba(13, 27, 42, 0.4);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 22px 26px;
            margin-bottom: 18px;
            position: relative;
            transition: var(--transition-smooth);
        }
        .timeline-item::before {
            content: '';
            position: absolute;
            left: -44px;
            top: 26px;
            width: 10px;
            height: 10px;
            background: var(--accent);
            border-radius: 50%;
            box-shadow: 0 0 12px rgba(24, 131, 255, 0.5);
            z-index: 2;
        }
        .timeline-item:last-child::before {
            background: var(--accent-green);
            box-shadow: 0 0 14px rgba(0, 180, 216, 0.5);
            animation: pulseDot 2s ease-in-out infinite;
        }
        @keyframes pulseDot {
            0%,
            100% {
                box-shadow: 0 0 12px rgba(0, 180, 216, 0.5);
            }
            50% {
                box-shadow: 0 0 24px rgba(0, 180, 216, 0.8);
            }
        }
        .timeline-item:hover {
            border-color: var(--border-glow);
            transform: translateX(6px);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
            background: rgba(13, 27, 42, 0.6);
        }
        .timeline-item .tl-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 8px;
        }
        .timeline-item .tl-version {
            font-weight: 800;
            font-size: 18px;
            color: var(--text-main);
            letter-spacing: -0.3px;
        }
        .timeline-item .tl-date {
            font-size: 12px;
            color: var(--text-dim);
            background: rgba(24, 131, 255, 0.06);
            padding: 4px 12px;
            border-radius: var(--radius-full);
            font-weight: 500;
        }
        .timeline-item .tl-changes {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.7;
        }
        .timeline-item .tl-changes ul {
            list-style: disc;
            padding-left: 18px;
            margin-top: 4px;
        }
        .timeline-item .tl-changes li {
            margin-bottom: 3px;
        }
        .timeline-item .tl-tag {
            display: inline-block;
            background: var(--accent-green);
            color: #000;
            font-size: 10px;
            font-weight: 700;
            padding: 3px 9px;
            border-radius: 4px;
            letter-spacing: 0.5px;
            margin-right: 6px;
        }

        /* 安装步骤简版 */
        .quick-steps-row {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            max-width: 1240px;
            margin: 0 auto 70px;
            padding: 0 24px;
        }
        .quick-step {
            text-align: center;
            padding: 28px 22px;
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            transition: var(--transition-smooth);
        }
        .quick-step:hover {
            border-color: var(--border-glow);
            transform: translateY(-3px);
            box-shadow: var(--shadow-card);
        }
        .quick-step .step-num-circle {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent), #1a6dd4);
            color: #fff;
            font-weight: 800;
            font-size: 18px;
            margin-bottom: 12px;
        }
        .quick-step h4 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .quick-step p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* CTA横幅 */
        .cta-banner {
            max-width: 1240px;
            margin: 0 auto 80px;
            padding: 0 24px;
            text-align: center;
        }
        .cta-inner {
            background: linear-gradient(135deg, rgba(13, 27, 42, 0.85) 0%, rgba(24, 131, 255, 0.06) 50%, rgba(7, 15, 30, 0.85) 100%);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-xl);
            padding: 50px 36px;
            transition: var(--transition-smooth);
        }
        .cta-inner:hover {
            border-color: var(--border-glow);
            box-shadow: 0 0 40px rgba(24, 131, 255, 0.06);
        }
        .cta-inner h2 {
            font-size: 30px;
            font-weight: 800;
            margin-bottom: 10px;
            letter-spacing: -0.5px;
        }
        .cta-inner p {
            font-size: 15px;
            color: var(--text-muted);
            max-width: 560px;
            margin: 0 auto 24px;
            line-height: 1.7;
        }
        .btn-cta-large {
            display: inline-block;
            background: var(--accent);
            color: #fff;
            font-size: 17px;
            font-weight: 700;
            padding: 16px 44px;
            border-radius: var(--radius-full);
            letter-spacing: 0.3px;
            transition: var(--transition-smooth);
            box-shadow: 0 4px 24px rgba(24, 131, 255, 0.25);
        }
        .btn-cta-large:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 36px rgba(24, 131, 255, 0.45);
            background: #258fff;
        }

        /* Footer - 与首页完全一致 */
        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 .footer-logo {
            font-size: 22px;
            font-weight: 800;
            color: var(--text-main);
            letter-spacing: -0.4px;
        }
        .footer-info .footer-logo span {
            color: var(--accent);
        }
        .footer-info p {
            margin-top: 10px;
            max-width: 300px;
            font-size: 13px;
            line-height: 1.7;
        }
        .footer-links {
            display: flex;
            gap: 70px;
            flex-wrap: wrap;
        }
        .footer-column h4 {
            color: var(--text-main);
            margin-bottom: 16px;
            font-size: 15px;
            font-weight: 600;
            letter-spacing: 0.2px;
        }
        .footer-column li {
            margin-bottom: 9px;
        }
        .footer-column a {
            color: var(--text-muted);
            font-size: 13px;
            transition: var(--transition-fast);
        }
        .footer-column a:hover {
            color: var(--accent);
        }
        .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;
            font-size: 12px;
        }

        /* 响应式 */
        @media (max-width: 968px) {
            .windows-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .sub-platforms-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .info-grid {
                grid-template-columns: 1fr;
            }
            .quick-steps-row {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .footer-container {
                flex-direction: column;
            }
            .footer-links {
                gap: 30px;
            }
            .download-hero {
                padding: 140px 20px 30px;
            }
            .download-hero h1 {
                font-size: 28px;
            }
            .main-windows-card {
                padding: 32px 22px;
            }
            .main-windows-card::before {
                font-size: 10px;
                top: 18px;
                right: -40px;
                padding: 5px 38px;
            }
            .timeline-wrapper {
                padding-left: 38px;
            }
            .timeline-wrapper::before {
                left: 13px;
            }
            .timeline-item::before {
                left: -33px;
                width: 8px;
                height: 8px;
                top: 22px;
            }
            .timeline-item {
                padding: 18px 16px;
            }
            nav {
                display: none;
                position: fixed;
                top: 0;
                right: 0;
                width: 270px;
                height: 100vh;
                background: rgba(7, 15, 30, 0.97);
                flex-direction: column;
                padding: 80px 30px 30px;
                gap: 24px;
                border-left: 1px solid var(--border-subtle);
                z-index: 999;
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
            }
            nav.open {
                display: flex;
            }
            .menu-toggle {
                display: block;
            }
            .nav-right .btn-login {
                display: none;
            }
            .nav-right .btn-login.mobile-visible {
                display: inline-flex;
                position: fixed;
                bottom: 30px;
                right: 30px;
                z-index: 1002;
                box-shadow: var(--shadow-glow-lg);
            }
        }
        @media (max-width: 540px) {
            .sub-platforms-grid {
                grid-template-columns: 1fr;
            }
            .meta-list {
                grid-template-columns: 1fr;
            }
            .quick-stats-row {
                gap: 16px;
                font-size: 12px;
            }
            .windows-info h2 {
                font-size: 24px;
            }
            .btn-windows-download {
                font-size: 16px;
                padding: 15px 28px;
            }
            .cta-inner {
                padding: 34px 20px;
            }
            .cta-inner h2 {
                font-size: 24px;
            }
            .checksum-box {
                padding: 20px 18px;
            }
            .hash-code {
                font-size: 11px;
                padding: 10px 12px;
            }
        }