:root {
            --bg-color: #060812;
            --card-bg: rgba(15, 20, 38, 0.65);
            --card-hover: rgba(26, 33, 62, 0.85);
            --border-color: rgba(255, 255, 255, 0.08);
            --border-glow: rgba(99, 102, 241, 0.3);
            --primary-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
            --btn-blue: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
            --text-main: #f8fafc;
            --text-muted: #94a3b8;
            --accent-green: #10b981;
            --accent-purple: #c084fc;
            --accent-amber: #f59e0b;
            --accent-cyan: #22d3ee;
            --surface-elevated: rgba(22, 28, 50, 0.7);
            --glow-indigo: rgba(99, 102, 241, 0.25);
            --glow-pink: rgba(236, 72, 153, 0.2);
            --font-mono: 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
        }

        body {
            background-color: var(--bg-color);
            color: var(--text-main);
            overflow-x: hidden;
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }

        .bg-grid {
            position: fixed;
            top: 0;
            left: 0;
            width: 100vw;
            height: 100vh;
            background-image:
                radial-gradient(circle at 50% 15%, rgba(99, 102, 241, 0.18) 0%, transparent 45%),
                radial-gradient(circle at 85% 75%, rgba(236, 72, 153, 0.12) 0%, transparent 40%),
                radial-gradient(circle at 20% 60%, rgba(34, 211, 238, 0.06) 0%, transparent 35%),
                linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
                linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
            background-size: 100% 100%, 100% 100%, 100% 100%, 50px 50px, 50px 50px;
            z-index: -1;
            pointer-events: none;
        }

        header {
            position: sticky;
            top: 0;
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            background: rgba(6, 8, 18, 0.75);
            border-bottom: 1px solid var(--border-color);
            z-index: 100;
        }

        .nav-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 2rem;
        }

        .logo-wrapper {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            text-decoration: none;
        }

        .logo-svg {
            width: 38px;
            height: 38px;
            filter: drop-shadow(0 0 10px rgba(99, 102, 241, 0.5));
            transition: filter 0.3s ease;
        }
        .logo-wrapper:hover .logo-svg {
            filter: drop-shadow(0 0 18px rgba(99, 102, 241, 0.8));
        }

        .logo-text {
            font-size: 1.6rem;
            font-weight: 800;
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            letter-spacing: -0.5px;
        }

        .nav-links {
            display: flex;
            gap: 2rem;
            list-style: none;
        }
        .nav-links a {
            color: var(--text-muted);
            text-decoration: none;
            font-size: 0.95rem;
            font-weight: 500;
            transition: all 0.3s ease;
            position: relative;
            padding: 0.25rem 0;
        }
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary-gradient);
            border-radius: 1px;
            transition: width 0.3s ease;
        }
        .nav-links a:hover::after,
        .nav-links a.active::after {
            width: 100%;
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--text-main);
            text-shadow: 0 0 12px rgba(255, 255, 255, 0.6);
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 2rem;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 0.9rem 2.4rem;
            border-radius: 50px;
            font-size: 1.05rem;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            cursor: pointer;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--btn-blue);
            color: #fff;
            box-shadow: 0 0 30px rgba(59, 130, 246, 0.5);
            border: none;
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 0 45px rgba(59, 130, 246, 0.8);
        }
        .btn-secondary {
            background: rgba(255, 255, 255, 0.05);
            color: var(--text-main);
            border: 1px solid var(--border-color);
            backdrop-filter: blur(10px);
        }
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(255, 255, 255, 0.3);
            transform: translateY(-3px);
        }
        .btn-outline-indigo {
            background: transparent;
            border: 1px solid rgba(99, 102, 241, 0.5);
            color: #c7d2fe;
            padding: 0.65rem 1.8rem;
            border-radius: 50px;
            font-weight: 600;
            transition: all 0.3s ease;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
        }
        .btn-outline-indigo:hover {
            background: rgba(99, 102, 241, 0.15);
            border-color: #818cf8;
            box-shadow: 0 0 20px var(--glow-indigo);
            transform: translateY(-2px);
        }

        .section-title {
            text-align: center;
            margin-bottom: 3.5rem;
        }
        .section-title h2 {
            font-size: 2.5rem;
            font-weight: 800;
            margin-bottom: 0.8rem;
        }
        .section-title p {
            color: var(--text-muted);
            font-size: 1.1rem;
        }

        /* 下载英雄区 */
        .download-hero {
            padding: 5rem 0 2rem;
            text-align: center;
        }
        .download-hero h1 {
            font-size: 3.8rem;
            font-weight: 900;
            line-height: 1.15;
            letter-spacing: -1.5px;
            margin-bottom: 1.5rem;
        }
        .gradient-text {
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .download-hero .sub-text {
            font-size: 1.2rem;
            color: var(--text-muted);
            max-width: 750px;
            margin: 0 auto 2rem;
        }

        /* 平台下载卡片网格 */
        .platforms-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 1.8rem;
            margin-bottom: 7rem;
        }
        .platform-card {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 22px;
            padding: 2rem 1.5rem 1.8rem;
            text-align: center;
            backdrop-filter: blur(12px);
            transition: all 0.35s ease;
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        .platform-card:hover {
            transform: translateY(-5px);
            border-color: var(--border-glow);
            box-shadow: 0 15px 40px rgba(99, 102, 241, 0.2);
            background: var(--card-hover);
        }
        .platform-icon {
            width: 64px;
            height: 64px;
            background: rgba(99, 102, 241, 0.08);
            border-radius: 18px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
            color: #a5b4fc;
            transition: 0.3s;
        }
        .platform-card:hover .platform-icon {
            background: rgba(99, 102, 241, 0.18);
            box-shadow: 0 0 20px var(--glow-indigo);
        }
        .platform-card h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 0.4rem;
        }
        .platform-card .version-badge {
            font-size: 0.8rem;
            color: var(--accent-cyan);
            background: rgba(34, 211, 238, 0.1);
            padding: 0.15rem 0.8rem;
            border-radius: 20px;
            margin-bottom: 1rem;
            display: inline-block;
        }
        .platform-card .file-meta {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-bottom: 1.5rem;
            font-family: var(--font-mono);
        }
        .platform-card .btn {
            width: 100%;
            margin-top: auto;
        }

        /* 安装指引创意版块 */
        .install-guide {
            margin-bottom: 7rem;
        }
        .guide-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.8rem;
        }
        .guide-item {
            background: var(--surface-elevated);
            border: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: 18px;
            padding: 2rem 1.5rem;
            position: relative;
            transition: 0.3s;
        }
        .guide-item:hover {
            border-color: rgba(255, 255, 255, 0.15);
            box-shadow: 0 12px 30px rgba(0,0,0,0.5);
            transform: translateY(-4px);
        }
        .guide-step-num {
            font-size: 2.8rem;
            font-weight: 900;
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 0.6rem;
        }
        .guide-item h4 {
            font-size: 1.1rem;
            margin-bottom: 0.4rem;
        }
        .guide-item p {
            font-size: 0.88rem;
            color: var(--text-muted);
        }

        /* 安全校验区域 */
        .verify-section {
            margin-bottom: 7rem;
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 24px;
            padding: 2.8rem 2.5rem;
            backdrop-filter: blur(14px);
            display: flex;
            flex-wrap: wrap;
            gap: 2.5rem;
            align-items: center;
            justify-content: center;
        }
        .verify-box {
            flex: 1 1 260px;
            text-align: center;
        }
        .verify-box h4 {
            font-size: 1.1rem;
            margin-bottom: 0.8rem;
            color: var(--accent-purple);
        }
        .hash-code {
            background: rgba(0,0,0,0.4);
            border-radius: 12px;
            padding: 0.9rem 1.2rem;
            font-family: var(--font-mono);
            font-size: 0.8rem;
            word-break: break-all;
            color: var(--text-muted);
            border: 1px solid rgba(255,255,255,0.05);
            transition: 0.3s;
        }
        .hash-code:hover {
            border-color: rgba(99,102,241,0.4);
            color: #e2e8f0;
        }

        /* 版本亮点与更新日志 */
        .changelog-preview {
            margin-bottom: 7rem;
        }
        .changelog-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
        }
        .changelog-card {
            background: var(--surface-elevated);
            border-left: 3px solid #6366f1;
            border-radius: 0 14px 14px 0;
            padding: 1.8rem;
            transition: 0.3s;
        }
        .changelog-card:hover {
            background: var(--card-hover);
            border-left-color: #a855f7;
        }
        .changelog-card h4 {
            font-size: 1.05rem;
            margin-bottom: 0.5rem;
        }
        .changelog-card p {
            font-size: 0.85rem;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* 信任数据 */
        .trust-stats {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 2rem;
            margin-bottom: 7rem;
            text-align: center;
        }
        .trust-stat-item {
            background: var(--card-bg);
            border-radius: 18px;
            padding: 2rem 1rem;
            border: 1px solid var(--border-color);
        }
        .trust-stat-item .big-num {
            font-size: 2.5rem;
            font-weight: 900;
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .trust-stat-item p {
            color: var(--text-muted);
            font-size: 0.9rem;
            margin-top: 0.3rem;
        }

        /* CTA */
        .cta-box {
            background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(236, 72, 153, 0.15) 100%);
            border: 1px solid rgba(255, 255, 255, 0.15);
            border-radius: 28px;
            padding: 4rem 2rem;
            text-align: center;
            margin-bottom: 6rem;
        }
        .cta-box h2 {
            font-size: 2.3rem;
            font-weight: 800;
            margin-bottom: 1rem;
        }
        .cta-box p {
            color: var(--text-muted);
            max-width: 600px;
            margin: 0 auto 2rem;
        }

        footer {
            border-top: 1px solid var(--border-color);
            padding: 4rem 2rem 2rem;
            background: rgba(4, 6, 14, 0.9);
            color: var(--text-muted);
        }
        .footer-grid {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 2fr repeat(3, 1fr);
            gap: 3rem;
            margin-bottom: 3rem;
        }
        .footer-brand p { font-size: 0.9rem; margin-top: 1rem; max-width: 320px; }
        .footer-column h5 { color: var(--text-main); font-size: 1rem; margin-bottom: 1.2rem; }
        .footer-column ul { list-style: none; display: flex; flex-direction: column; gap: 0.8rem; }
        .footer-column a { color: var(--text-muted); text-decoration: none; font-size: 0.9rem; transition: color 0.3s; }
        .footer-column a:hover { color: var(--text-main); }
        .footer-bottom {
            max-width: 1200px; margin: 0 auto; padding-top: 2rem;
            border-top: 1px solid rgba(255,255,255,0.05);
            display: flex; justify-content: space-between; align-items: center; font-size: 0.85rem;
        }

        @media (max-width: 992px) {
            .guide-steps { grid-template-columns: repeat(2, 1fr); }
            .changelog-grid { grid-template-columns: 1fr 1fr; }
            .trust-stats { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 768px) {
            .download-hero h1 { font-size: 2.5rem; }
            .platforms-grid { grid-template-columns: 1fr; }
            .guide-steps { grid-template-columns: 1fr; }
            .changelog-grid { grid-template-columns: 1fr; }
            .trust-stats { grid-template-columns: 1fr; }
            .verify-section { flex-direction: column; }
            .footer-grid { grid-template-columns: 1fr; }
            .footer-bottom { flex-direction: column; gap: 1rem; }
        }