:root {
            --bg-main: #f8fafc;
            --bg-card: #ffffff;
            --primary: #6366f1;
            --primary-dark: #4f46e5;
            --accent: #06b6d4;
            --text-heading: #0f172a;
            --text-body: #475569;
            --text-muted: #94a3b8;
            --border: #e2e8f0;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
            --shadow-md: 0 10px 25px rgba(0,0,0,0.06);
            --shadow-lg: 0 20px 40px rgba(0,0,0,0.08);
            --radius-sm: 10px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * { box-sizing: border-box; margin: 0; padding: 0; }
        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", sans-serif;
            background-color: var(--bg-main);
            color: var(--text-body);
            line-height: 1.6;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }
        a { color: inherit; text-decoration: none; transition: var(--transition); }

        /* ========== 导航栏 ========== */
        .header {
            position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
            background: rgba(255,255,255,0.82); backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px); border-bottom: 1px solid var(--border);
        }
        .nav-container {
            max-width: 1320px; margin: 0 auto; padding: 0.9rem 2rem;
            display: flex; justify-content: space-between; align-items: center;
        }
        .logo {
            display: flex; align-items: center; gap: 10px;
            font-size: 1.35rem; font-weight: 800; color: var(--text-heading);
            letter-spacing: -0.01em;
        }
        .logo-svg { width: 34px; height: 34px; flex-shrink: 0; }
        .logo-badge {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #fff; font-size: 0.7rem; padding: 3px 10px; border-radius: 20px;
            font-weight: 700; letter-spacing: 0.02em;
        }
        .nav-menu { display: flex; align-items: center; gap: 2.2rem; }
        .nav-link {
            font-size: 0.93rem; font-weight: 600; color: var(--text-body);
            position: relative; padding: 4px 0;
        }
        .nav-link::after {
            content: ''; position: absolute; bottom: -2px; left: 0;
            width: 0; height: 2px; background: var(--primary); border-radius: 1px;
            transition: width var(--transition);
        }
        .nav-link:hover,
        .nav-link.active { color: var(--primary); }
        .nav-link:hover::after,
        .nav-link.active::after { width: 100%; }
        .btn-nav {
            background: var(--text-heading); color: #ffffff !important;
            padding: 9px 20px; border-radius: 8px; font-size: 0.9rem; font-weight: 700;
            transition: all var(--transition); white-space: nowrap;
        }
        .btn-nav:hover {
            background: var(--primary);
            box-shadow: 0 6px 18px rgba(99,102,241,0.35);
            transform: translateY(-1px);
        }

        /* ========== 页面头部 ========== */
        .page-hero {
            padding: 150px 2rem 40px 2rem;
            text-align: center;
            max-width: 820px;
            margin: 0 auto;
        }
        .page-hero .hero-eyebrow {
            display: inline-block;
            background: #eef2ff;
            color: var(--primary);
            font-size: 0.85rem;
            font-weight: 700;
            padding: 5px 16px;
            border-radius: 30px;
            margin-bottom: 1rem;
            letter-spacing: 0.03em;
        }
        .page-hero h1 {
            font-size: 2.8rem;
            font-weight: 900;
            color: var(--text-heading);
            margin-bottom: 1rem;
            letter-spacing: -0.02em;
        }
        .page-hero h1 span {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .page-hero p {
            font-size: 1.1rem;
            color: var(--text-body);
            max-width: 640px;
            margin: 0 auto;
        }

        /* ========== 下载卡片区域（原排版不变） ========== */
        .download-container {
            max-width: 1320px;
            margin: 0 auto;
            padding: 0 2rem 80px 2rem;
        }
        .download-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
            margin-bottom: 60px;
        }
        .download-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 2rem 1.5rem;
            text-align: center;
            box-shadow: var(--shadow-sm);
            transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }
        .download-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary);
        }
        .platform-icon {
            width: 48px;
            height: 48px;
            margin: 0 auto 1.2rem auto;
            fill: var(--text-heading);
        }
        .download-card h3 {
            font-size: 1.2rem;
            color: var(--text-heading);
            margin-bottom: 0.5rem;
            font-weight: 700;
        }
        .download-card .version {
            font-size: 0.85rem;
            color: var(--primary);
            font-weight: 600;
            margin-bottom: 1rem;
            background: rgba(99,102,241,0.08);
            padding: 4px 10px;
            border-radius: 20px;
            display: inline-block;
        }
        .download-card .specs {
            font-size: 0.88rem;
            color: var(--text-body);
            margin-bottom: 1.8rem;
            line-height: 1.5;
        }
        .btn-download {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: white !important;
            padding: 12px 20px;
            border-radius: 10px;
            font-weight: 700;
            font-size: 0.95rem;
            display: block;
            box-shadow: 0 4px 12px rgba(99,102,241,0.2);
            transition: opacity 0.2s, box-shadow 0.2s;
        }
        .btn-download:hover {
            opacity: 0.92;
            box-shadow: 0 8px 20px rgba(99,102,241,0.35);
        }

        /* ========== 兼容性提示卡片（原样式保留，文字更新） ========== */
        .verify-box {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 2rem;
            max-width: 1000px;
            margin: 0 auto;
            box-shadow: var(--shadow-sm);
        }
        .verify-box h4 {
            font-size: 1.1rem;
            color: var(--text-heading);
            margin-bottom: 1rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .info-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
            margin-top: 1rem;
            text-align: left;
        }
        .info-item {
            font-size: 0.88rem;
            line-height: 1.5;
        }
        .info-item strong {
            color: var(--text-heading);
            display: block;
            margin-bottom: 0.3rem;
        }

        /* ========== 新增创意版块样式 ========== */
        .why-download-section {
            max-width: 1320px;
            margin: 0 auto 90px;
            padding: 0 2rem;
        }
        .section-header {
            text-align: center;
            max-width: 700px;
            margin: 0 auto 50px;
        }
        .section-header .section-eyebrow {
            display: inline-block;
            font-size: 0.85rem;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: 0.05em;
            text-transform: uppercase;
            margin-bottom: 0.5rem;
        }
        .section-header h2 {
            font-size: 2.2rem;
            color: var(--text-heading);
            font-weight: 800;
            margin-bottom: 1rem;
            letter-spacing: -0.02em;
        }
        .section-header p {
            font-size: 1.05rem;
            color: var(--text-muted);
        }
        .feature-list-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1.5rem;
        }
        .feature-item {
            display: flex;
            align-items: flex-start;
            gap: 1rem;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 1.8rem;
            transition: box-shadow var(--transition);
        }
        .feature-item:hover { box-shadow: var(--shadow-md); }
        .feature-icon {
            font-size: 1.8rem;
            flex-shrink: 0;
            width: 48px;
            text-align: center;
        }
        .feature-text h4 {
            font-size: 1.1rem;
            color: var(--text-heading);
            font-weight: 700;
            margin-bottom: 0.4rem;
        }
        .feature-text p {
            font-size: 0.92rem;
            color: var(--text-body);
            line-height: 1.5;
        }

        .install-steps-section {
            background: #fff;
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
            padding: 90px 2rem;
        }
        .steps-grid {
            max-width: 1000px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
            text-align: center;
        }
        .step-card .step-number {
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #fff;
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.2rem;
            margin-bottom: 1rem;
        }
        .step-card h4 {
            font-size: 1.1rem;
            color: var(--text-heading);
            font-weight: 700;
            margin-bottom: 0.4rem;
        }
        .step-card p {
            font-size: 0.9rem;
            color: var(--text-body);
        }

        .faq-download-section {
            max-width: 1000px;
            margin: 90px auto;
            padding: 0 2rem;
        }
        .faq-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1.5rem;
        }
        .faq-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 1.6rem 1.8rem;
            transition: box-shadow var(--transition);
        }
        .faq-card:hover { box-shadow: var(--shadow-md); }
        .faq-card h4 {
            font-size: 1.05rem;
            color: var(--text-heading);
            font-weight: 700;
            margin-bottom: 0.5rem;
        }
        .faq-card p {
            font-size: 0.9rem;
            color: var(--text-body);
            line-height: 1.6;
        }

        .cta-download {
            background: linear-gradient(135deg, #0f172a, #1e293b);
            border-radius: var(--radius-lg);
            max-width: 1000px;
            margin: 0 auto 80px;
            padding: 3.5rem 2.5rem;
            text-align: center;
            color: #fff;
        }
        .cta-download h2 {
            font-size: 2rem;
            font-weight: 900;
            margin-bottom: 1rem;
            letter-spacing: -0.02em;
        }
        .cta-download p {
            color: #cbd5e1;
            margin-bottom: 2rem;
        }
        .btn-cta-large {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            padding: 15px 36px;
            border-radius: 12px;
            font-weight: 700;
            font-size: 1.1rem;
            display: inline-block;
            transition: all var(--transition);
            box-shadow: 0 10px 24px rgba(99,102,241,0.3);
        }
        .btn-cta-large:hover {
            transform: translateY(-2px);
            box-shadow: 0 16px 32px rgba(99,102,241,0.45);
        }

        /* Footer */
        .footer {
            background: #fff;
            border-top: 1px solid var(--border);
            padding: 60px 2rem 30px;
            font-size: 0.9rem;
            color: var(--text-body);
        }
        .footer-container {
            max-width: 1320px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            gap: 2.5rem;
            flex-wrap: wrap;
        }
        .footer-brand { max-width: 340px; }
        .footer-brand h4 {
            font-size: 1.15rem;
            color: var(--text-heading);
            margin-bottom: 0.8rem;
        }
        .footer-links h5 {
            color: var(--text-heading);
            font-size: 0.9rem;
            margin-bottom: 0.8rem;
            font-weight: 700;
        }
        .footer-links ul { list-style: none; }
        .footer-links li { margin-bottom: 0.45rem; }
        .footer-links a:hover { color: var(--primary); }
        .footer-bottom {
            max-width: 1320px;
            margin: 40px auto 0;
            padding-top: 20px;
            border-top: 1px solid var(--border);
            text-align: center;
            font-size: 0.82rem;
            color: var(--text-muted);
        }

        @media (max-width: 1024px) {
            .download-grid { grid-template-columns: repeat(2, 1fr); }
            .feature-list-grid { grid-template-columns: 1fr; }
            .faq-grid { grid-template-columns: 1fr; }
            .steps-grid { grid-template-columns: 1fr; }
        }
        @media (max-width: 768px) {
            .info-grid { grid-template-columns: 1fr; }
            .nav-menu { display: none; }
            .page-hero h1 { font-size: 2rem; }
            .download-grid { grid-template-columns: 1fr; }
        }