:root {
            --primary: #e03131;
            --primary-deep: #c62828;
            --primary-soft: #fff5f5;
            --blue-dark: #0b1e33;
            --blue-mid: #0f2b47;
            --blue-light: #132f4c;
            --text-primary: #1a1a2e;
            --text-secondary: #4a5568;
            --text-muted: #64748b;
            --bg-white: #ffffff;
            --bg-slate: #f8fafc;
            --bg-cool: #f0f4f8;
            --border: #e2e8f0;
            --border-light: #edf2f7;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.06);
            --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.08);
            --shadow-xl: 0 24px 64px rgba(0, 0, 0, 0.10);
            --radius-sm: 8px;
            --radius: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-sans);
            color: var(--text-primary);
            background-color: var(--bg-white);
            line-height: 1.6;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition);
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 28px;
        }
        /* 头部样式（与首页一致） */
        .header {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 88px;
            display: flex;
            align-items: center;
            z-index: 100;
            background: transparent;
            transition: background var(--transition), box-shadow var(--transition);
        }
        .header.scrolled {
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            box-shadow: var(--shadow-sm);
            position: fixed;
        }
        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
            gap: 40px;
        }
        .logo-area {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .logo-icon {
            width: 36px;
            height: 36px;
            flex-shrink: 0;
        }
        .logo-text {
            font-size: 21px;
            font-weight: 800;
            color: #0b2b4a;
            letter-spacing: -0.4px;
            white-space: nowrap;
        }
        .logo-dot {
            display: inline-block;
            width: 7px;
            height: 7px;
            background: var(--primary);
            border-radius: 50%;
            margin-left: 1px;
            vertical-align: middle;
            position: relative;
            top: -6px;
        }
        .nav-list {
            display: flex;
            list-style: none;
            gap: 8px;
            flex-wrap: wrap;
            justify-content: center;
        }
        .nav-item {
            font-size: 14.5px;
            font-weight: 600;
            color: var(--text-primary);
            padding: 8px 16px;
            border-radius: 22px;
            transition: all var(--transition);
            white-space: nowrap;
            position: relative;
        }
        .nav-item:hover {
            color: #005fa9;
            background: rgba(0, 95, 169, 0.05);
        }
        .nav-item.nav-cta {
            background: var(--primary);
            color: #fff;
            font-weight: 700;
            padding: 10px 22px;
            border-radius: 24px;
        }
        .nav-item.nav-cta:hover {
            background: var(--primary-deep);
            color: #fff;
            box-shadow: 0 4px 14px rgba(224, 49, 49, 0.30);
        }
        .nav-item.active-dl {
            color: #005fa9;
            background: rgba(0, 95, 169, 0.08);
            font-weight: 700;
        }
        /* 页面主体 */
        .download-hero {
            padding: 160px 0 70px;
            background: linear-gradient(155deg, #f5f9fd 0%, #eaf2fa 30%, #f8fafc 60%, #f0f5fb 100%);
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .download-hero::before {
            content: '';
            position: absolute;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle at 50% 50%, rgba(0, 120, 210, 0.05) 0%, transparent 70%);
            top: -120px;
            right: -80px;
            border-radius: 50%;
            pointer-events: none;
        }
        .section-tag {
            display: inline-block;
            font-size: 13px;
            font-weight: 700;
            color: #005fa9;
            background: rgba(0, 95, 169, 0.07);
            padding: 6px 16px;
            border-radius: 20px;
            margin-bottom: 16px;
            letter-spacing: 0.5px;
            text-transform: uppercase;
            position: relative;
            z-index: 1;
        }
        .download-hero h1 {
            font-size: 42px;
            font-weight: 850;
            color: #0b1e33;
            margin-bottom: 18px;
            letter-spacing: -0.5px;
            position: relative;
            z-index: 1;
        }
        .download-hero .sub-desc {
            font-size: 17px;
            color: var(--text-secondary);
            max-width: 680px;
            margin: 0 auto 44px;
            line-height: 1.7;
            position: relative;
            z-index: 1;
        }
        .creative-entries {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
            z-index: 1;
            margin-bottom: 30px;
        }
        .creative-entry-card {
            background: #fff;
            border: 1px solid var(--border-light);
            border-radius: var(--radius);
            padding: 26px 20px;
            text-align: left;
            transition: all var(--transition);
            text-decoration: none;
            color: inherit;
            display: flex;
            flex-direction: column;
            gap: 10px;
            cursor: pointer;
            position: relative;
            overflow: hidden;
        }
        .creative-entry-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .creative-entry-card .entry-icon {
            font-size: 32px;
            line-height: 1;
        }
        .creative-entry-card h4 {
            font-size: 15px;
            font-weight: 750;
            color: #0b1e33;
            letter-spacing: -0.2px;
        }
        .creative-entry-card p {
            font-size: 12.5px;
            color: var(--text-muted);
            line-height: 1.5;
        }
        .creative-entry-card .entry-arrow {
            align-self: flex-end;
            font-size: 18px;
            color: #cbd5e1;
            transition: all var(--transition);
            margin-top: 4px;
        }
        .creative-entry-card:hover .entry-arrow {
            color: #005fa9;
            transform: translateX(3px);
        }
        .platform-detail {
            padding: 80px 0;
            background: #fff;
        }
        .section-header {
            text-align: center;
            margin-bottom: 56px;
        }
        .section-header h2 {
            font-size: 36px;
            font-weight: 800;
            color: #0b1e33;
            letter-spacing: -0.3px;
            margin-bottom: 10px;
        }
        .section-header p {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 640px;
            margin: 0 auto;
            line-height: 1.7;
        }
        .platform-grid-detail {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
        }
        .platform-block {
            background: #f8fafc;
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }
        .platform-block:hover {
            box-shadow: var(--shadow-lg);
            border-color: transparent;
            transform: translateY(-3px);
        }
        .platform-block .plat-title {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 18px;
        }
        .platform-block .plat-icon {
            font-size: 40px;
        }
        .platform-block h3 {
            font-size: 22px;
            font-weight: 750;
            color: #0b1e33;
            letter-spacing: -0.2px;
        }
        .platform-block .specs {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-bottom: 16px;
        }
        .platform-block .specs li {
            background: #fff;
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 12.5px;
            font-weight: 600;
            color: #0b1e33;
            border: 1px solid var(--border-light);
            display: flex;
            align-items: center;
            gap: 5px;
        }
        .platform-block .specs li .spec-dot {
            width: 6px;
            height: 6px;
            background: #10b981;
            border-radius: 50%;
            flex-shrink: 0;
        }
        .platform-block p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 18px;
            flex: 1;
        }
        .platform-block .guide-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 700;
            color: #005fa9;
            transition: gap var(--transition);
            margin-top: auto;
        }
        .platform-block .guide-link:hover {
            gap: 10px;
            color: #00457c;
        }
        .history-info-section {
            padding: 80px 0;
            background: var(--bg-slate);
        }
        .info-layout {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
        }
        .info-box {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 38px 30px;
            border: 1px solid var(--border-light);
            transition: box-shadow var(--transition);
        }
        .info-box:hover {
            box-shadow: var(--shadow-lg);
        }
        .info-box h3 {
            font-size: 21px;
            font-weight: 750;
            color: #0b1e33;
            margin-bottom: 16px;
            letter-spacing: -0.2px;
        }
        .info-box p {
            font-size: 14.5px;
            color: var(--text-secondary);
            line-height: 1.8;
            text-align: justify;
        }
        .footer {
            padding: 44px 0;
            background: #080e16;
            border-top: 1px solid #1e293b;
            color: #64748b;
            font-size: 13.5px;
        }
        .footer-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }
        .footer-links {
            display: flex;
            gap: 22px;
            flex-wrap: wrap;
        }
        .footer-links a {
            color: #94a3b8;
            transition: color var(--transition);
            font-weight: 500;
        }
        .footer-links a:hover {
            color: #cbd5e1;
        }
        @media (max-width: 960px) {
            .creative-entries {
                grid-template-columns: 1fr 1fr;
            }
            .platform-grid-detail {
                grid-template-columns: 1fr;
            }
            .info-layout {
                grid-template-columns: 1fr;
            }
            .download-hero h1 {
                font-size: 32px;
            }
            .header {
                position: relative;
                height: auto;
                padding: 16px 0;
                background: #fff;
                border-bottom: 1px solid var(--border-light);
            }
            .header-inner {
                flex-direction: column;
                gap: 14px;
            }
            .nav-list {
                gap: 4px;
            }
            .nav-item {
                font-size: 13px;
                padding: 6px 12px;
            }
        }
        @media (max-width: 640px) {
            .creative-entries {
                grid-template-columns: 1fr;
            }
            .download-hero h1 {
                font-size: 26px;
            }
            .platform-block .specs {
                flex-direction: column;
                align-items: flex-start;
            }
        }.platform-actions {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-top: auto;
}
.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 700;
    color: #fff;
    background: var(--primary);
    border-radius: 24px;
    transition: all var(--transition);
    white-space: nowrap;
}
.download-btn:hover {
    background: var(--primary-deep);
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(224, 49, 49, 0.30);
    color: #fff;
}
.guide-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 700;
    color: #005fa9;
    transition: gap var(--transition);
    white-space: nowrap;
}
.guide-link:hover {
    gap: 10px;
    color: #00457c;
}