* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            --brand: #0f62fe;
            --brand-hover: #0043ce;
            --brand-light: #eef2ff;
            --dark: #0f2b3d;
            --dark-mid: #1a4a6f;
            --text: #0f172a;
            --text-sub: #2d3e50;
            --text-muted: #475569;
            --text-light: #5b6e8c;
            --border: #eef2f6;
            --border-light: #edf2f7;
            --bg-card: #fefefe;
            --bg-subtle: #f9fafb;
            --bg-footer: #fafcff;
            --white: #ffffff;
            --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.04), 0 8px 10px -6px rgba(0, 0, 0, 0.03);
            --shadow-lg: 0 20px 35px -12px rgba(0, 0, 0, 0.07);
            --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
            --radius-sm: 12px;
            --radius: 24px;
            --radius-lg: 36px;
            --radius-xl: 48px;
            --radius-full: 9999px;
            --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Helvetica, 'Noto Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            background-color: #ffffff;
            color: var(--text);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        /* ========== HEADER（与首页完全一致） ========== */
        .header {
            position: sticky;
            top: 0;
            background-color: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border);
            z-index: 100;
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.03);
        }

        .nav-container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0.9rem 2rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 1rem;
        }

        .logo-area {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            text-decoration: none;
            flex-shrink: 0;
        }

        .logo {
            font-weight: 800;
            font-size: 1.75rem;
            letter-spacing: -0.03em;
            background: linear-gradient(135deg, #0F2B3D 0%, #1A4A6F 60%, #2b6a9f 100%);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            line-height: 1;
        }

        .logo-badge {
            background-color: #eef2ff;
            padding: 0.2rem 0.65rem;
            border-radius: 40px;
            font-size: 0.68rem;
            font-weight: 700;
            color: #1e3a8a;
            letter-spacing: -0.01em;
            white-space: nowrap;
        }

        .nav-links {
            display: flex;
            gap: 1.6rem;
            align-items: center;
            flex-wrap: wrap;
            list-style: none;
        }

        .nav-links a {
            text-decoration: none;
            font-weight: 500;
            color: #1e293b;
            transition: color var(--transition);
            font-size: 0.95rem;
            white-space: nowrap;
            position: relative;
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--brand);
            border-radius: 2px;
            transition: width var(--transition);
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--brand);
        }
        .nav-links a:hover::after,
        .nav-links a.active::after {
            width: 100%;
        }

        .btn-outline-nav {
            border: 1px solid #cbd5e1;
            background: transparent;
            padding: 0.5rem 1.2rem;
            border-radius: 40px;
            font-weight: 500;
            cursor: pointer;
            transition: all var(--transition);
            font-size: 0.9rem;
            white-space: nowrap;
            text-decoration: none;
            color: #1e293b;
            display: inline-block;
        }
        .btn-outline-nav:hover {
            background-color: #f8fafc;
            border-color: #94a3b8;
        }

        .btn-primary-sm {
            background: var(--brand);
            color: white;
            border: none;
            padding: 0.5rem 1.3rem;
            border-radius: 40px;
            font-weight: 600;
            cursor: pointer;
            transition: all var(--transition);
            text-decoration: none;
            font-size: 0.9rem;
            white-space: nowrap;
            display: inline-block;
            box-shadow: 0 2px 8px rgba(15, 98, 254, 0.2);
        }
        .btn-primary-sm:hover {
            background: var(--brand-hover);
            box-shadow: 0 4px 14px rgba(15, 98, 254, 0.3);
            transform: translateY(-1px);
        }

        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 0.4rem;
            flex-direction: column;
            gap: 5px;
            z-index: 101;
        }
        .mobile-menu-btn span {
            display: block;
            width: 24px;
            height: 2.5px;
            background: var(--dark);
            border-radius: 2px;
            transition: all var(--transition);
        }

        /* ========== 页面特有样式 ========== */
        .page-hero {
            max-width: 1280px;
            margin: 2rem auto 3rem;
            padding: 2rem;
            text-align: center;
        }

        .page-badge {
            background: var(--brand-light);
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.3rem 1.2rem;
            border-radius: 40px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--brand);
            margin-bottom: 1.2rem;
            letter-spacing: -0.01em;
        }

        .page-title {
            font-size: 2.9rem;
            font-weight: 800;
            line-height: 1.25;
            letter-spacing: -0.025em;
            background: linear-gradient(135deg, #0a2540 0%, #1a4a6f 35%, #2b6a9f 70%, #0f62fe 100%);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            margin-bottom: 1rem;
        }

        .page-subtitle {
            font-size: 1.2rem;
            color: var(--text-sub);
            max-width: 700px;
            margin: 0 auto 2rem;
            line-height: 1.65;
        }

        .hero-download-area {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            justify-content: center;
            align-items: center;
        }

        .btn-primary-lg {
            background-color: var(--brand);
            color: white;
            border: none;
            padding: 0.95rem 2.8rem;
            border-radius: 48px;
            font-weight: 700;
            font-size: 1.15rem;
            cursor: pointer;
            transition: all var(--transition);
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            box-shadow: 0 4px 20px rgba(15, 98, 254, 0.3);
            letter-spacing: -0.01em;
        }
        .btn-primary-lg:hover {
            background-color: var(--brand-hover);
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(15, 98, 254, 0.4);
        }
        .btn-secondary-lg {
            background: transparent;
            border: 1.5px solid #cbd5e1;
            padding: 0.95rem 2.8rem;
            border-radius: 48px;
            font-weight: 600;
            color: #1e293b;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            transition: all var(--transition);
            font-size: 1.05rem;
        }
        .btn-secondary-lg:hover {
            background: #f8fafc;
            border-color: #94a3b8;
            transform: translateY(-1px);
        }

        .section {
            max-width: 1280px;
            margin: 4rem auto;
            padding: 2rem;
        }
        .section-header {
            text-align: center;
            margin-bottom: 3rem;
        }
        .section-title {
            font-size: 2.1rem;
            font-weight: 700;
            margin-bottom: 0.75rem;
            letter-spacing: -0.02em;
            color: var(--dark);
        }
        .section-sub {
            color: var(--text-muted);
            font-size: 1.1rem;
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.6;
        }

        /* 核心优势卡片 */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 1.75rem;
        }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 2.2rem 1.6rem;
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            position: relative;
        }
        .feature-card:hover {
            border-color: #cbdffc;
            transform: translateY(-4px);
            box-shadow: var(--shadow-xl);
        }
        .feature-icon {
            font-size: 2.5rem;
            margin-bottom: 1rem;
            display: block;
        }
        .feature-card h3 {
            font-size: 1.35rem;
            margin-bottom: 0.7rem;
            color: var(--dark);
        }
        .feature-card p {
            color: #334155;
            font-size: 0.95rem;
            line-height: 1.65;
        }

        /* 时间轴样式 */
        .timeline-wrapper {
            max-width: 800px;
            margin: 0 auto;
            position: relative;
            padding-left: 2.5rem;
        }
        .timeline-wrapper::before {
            content: '';
            position: absolute;
            left: 18px;
            top: 0;
            bottom: 0;
            width: 3px;
            background: linear-gradient(to bottom, var(--brand), #4d8df7);
            border-radius: 2px;
        }
        .timeline-item {
            position: relative;
            margin-bottom: 2.5rem;
            padding-left: 2rem;
        }
        .timeline-item:last-child {
            margin-bottom: 0;
        }
        .timeline-dot {
            position: absolute;
            left: -0.6rem;
            top: 0.3rem;
            width: 18px;
            height: 18px;
            background: white;
            border: 3px solid var(--brand);
            border-radius: 50%;
            box-shadow: 0 0 0 4px rgba(15, 98, 254, 0.1);
            z-index: 2;
        }
        .timeline-card {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            padding: 1.4rem 1.6rem;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .timeline-card:hover {
            border-color: #cbdffc;
            box-shadow: var(--shadow-md);
        }
        .timeline-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 0.35rem;
            color: var(--dark);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .timeline-card p {
            color: #334155;
            font-size: 0.9rem;
            line-height: 1.6;
        }

        /* 系统兼容 */
        .compat-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 1.5rem;
            max-width: 900px;
            margin: 0 auto;
        }
        .compat-card {
            background: var(--white);
            border-radius: var(--radius);
            padding: 1.8rem 1.5rem;
            text-align: center;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
        }
        .compat-card .os-icon {
            font-size: 2.8rem;
            margin-bottom: 0.5rem;
        }
        .compat-card h3 {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 0.5rem;
        }
        .compat-card ul {
            list-style: none;
            color: #334155;
            font-size: 0.9rem;
            line-height: 1.8;
        }

        /* 版本选择卡片 */
        .version-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 1.5rem;
            max-width: 1000px;
            margin: 0 auto;
        }
        .version-card {
            background: white;
            border-radius: var(--radius);
            padding: 2rem 1.6rem;
            text-align: center;
            border: 2px solid var(--border-light);
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
            position: relative;
        }
        .version-card:hover {
            border-color: var(--brand);
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
        }
        .version-card.recommended {
            border-color: var(--brand);
            background: #fafcff;
        }
        .version-card .rec-badge {
            position: absolute;
            top: -13px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--brand);
            color: white;
            padding: 0.25rem 1.2rem;
            border-radius: 40px;
            font-size: 0.75rem;
            font-weight: 700;
        }
        .version-card h3 {
            font-size: 1.35rem;
            font-weight: 700;
            margin: 0.5rem 0 0.6rem;
            color: var(--dark);
        }
        .version-card p {
            font-size: 0.9rem;
            color: #334155;
            margin-bottom: 1.2rem;
            line-height: 1.6;
        }
        .btn-dl-version {
            display: inline-block;
            background: var(--brand);
            color: white;
            padding: 0.7rem 2rem;
            border-radius: 40px;
            font-weight: 700;
            text-decoration: none;
            font-size: 0.95rem;
            transition: all var(--transition);
            box-shadow: 0 3px 10px rgba(15, 98, 254, 0.2);
        }
        .btn-dl-version:hover {
            background: var(--brand-hover);
            box-shadow: 0 6px 18px rgba(15, 98, 254, 0.3);
        }

        /* 文章卡片 */
        .article-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 1.5rem;
        }
        .article-card {
            background: var(--bg-subtle);
            border-radius: var(--radius);
            padding: 1.8rem 1.6rem;
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            text-decoration: none;
            color: inherit;
            display: block;
        }
        .article-card:hover {
            border-color: #cbdffc;
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
            background: white;
        }
        .article-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            color: var(--dark);
        }
        .article-card p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 0.8rem;
        }
        .article-card .read-more {
            font-weight: 600;
            color: var(--brand);
            font-size: 0.9rem;
        }

        /* CTA 横幅 */
        .cta-banner {
            background: linear-gradient(105deg, #0f2b3d 0%, #1b4a6e 45%, #1a5480 100%);
            margin: 4rem auto;
            max-width: 1100px;
            border-radius: var(--radius-xl);
            padding: 3.5rem 2.5rem;
            text-align: center;
            color: white;
            position: relative;
            overflow: hidden;
        }
        .cta-banner h2 {
            font-size: 2rem;
            margin-bottom: 1rem;
            position: relative;
            z-index: 1;
        }
        .cta-banner p {
            margin-bottom: 2rem;
            opacity: 0.9;
            position: relative;
            z-index: 1;
        }
        .btn-white {
            background: white;
            color: #0f2b3d;
            border: none;
            padding: 0.8rem 2.2rem;
            border-radius: 40px;
            font-weight: 700;
            text-decoration: none;
            display: inline-block;
            transition: all var(--transition);
            font-size: 1rem;
            box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
        }
        .btn-white:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 22px rgba(0, 0, 0, 0.25);
        }

        /* 页脚 */
        .footer {
            border-top: 1px solid var(--border);
            margin-top: 4rem;
            background-color: var(--bg-footer);
        }
        .footer-container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 3rem 2rem 2rem;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 2.5rem;
        }
        .footer-col h4 {
            margin-bottom: 1rem;
            font-size: 1rem;
            font-weight: 700;
            color: var(--dark);
        }
        .footer-col a {
            display: block;
            color: #475569;
            text-decoration: none;
            margin-bottom: 0.7rem;
            font-size: 0.9rem;
            transition: color var(--transition);
        }
        .footer-col a:hover {
            color: var(--brand);
        }
        .copyright {
            text-align: center;
            padding: 1.5rem;
            border-top: 1px solid var(--border);
            font-size: 0.8rem;
            color: var(--text-light);
        }

        @media (max-width: 780px) {
            .nav-container {
                flex-direction: row;
                flex-wrap: wrap;
            }
            .page-title {
                font-size: 2rem;
            }
            .timeline-wrapper {
                padding-left: 1.5rem;
            }
            .version-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 680px) {
            .nav-links {
                display: none;
                width: 100%;
                flex-direction: column;
                background: white;
                border-radius: var(--radius-sm);
                padding: 1rem;
                box-shadow: var(--shadow-lg);
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                border: 1px solid var(--border);
            }
            .nav-links.open {
                display: flex;
            }
            .mobile-menu-btn {
                display: flex;
            }
        }