:root {
            --primary: #4f46e5;
            --primary-dark: #4338ca;
            --accent: #f472b6;
            --text-main: #1f2937;
            --text-light: #6b7280;
            --bg-light: #f9fafb;
            --white: #ffffff;
            --radius: 14px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.08), 0 4px 10px -2px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 20px 40px -8px rgba(0, 0, 0, 0.12);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background: var(--bg-light);
            line-height: 1.65;
            -webkit-font-smoothing: antialiased;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition);
        }
        ul {
            list-style: none;
        }
        .container {
            max-width: 1180px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .flex-between {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        /* Header (与首页保持一致) */
        header {
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow-sm);
            transition: box-shadow var(--transition);
        }
        header.scrolled {
            box-shadow: var(--shadow);
        }
        .nav-container {
            height: 66px;
        }
        .logo {
            font-size: 1.45rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.4px;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .logo .rocket-icon {
            display: inline-block;
            font-size: 1.6rem;
            animation: float 2.5s ease-in-out infinite;
        }
        @keyframes float {
            0%,
            100% {
                transform: translateY(0);
            }
            50% {
                transform: translateY(-4px);
            }
        }
        .logo span {
            color: var(--text-main);
            font-weight: 700;
        }
        nav ul {
            display: flex;
            gap: 28px;
            align-items: center;
        }
        nav a {
            font-weight: 500;
            color: var(--text-light);
            font-size: 0.93rem;
            position: relative;
            padding: 4px 0;
        }
        nav a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
            transition: width var(--transition);
        }
        nav a:hover::after,
        nav a.active::after {
            width: 100%;
        }
        nav a:hover,
        nav a.active {
            color: var(--primary);
        }
        .nav-cta {
            background: var(--primary);
            color: #fff !important;
            padding: 8px 18px !important;
            border-radius: 22px;
            font-weight: 600 !important;
            font-size: 0.88rem !important;
            transition: background var(--transition), transform var(--transition) !important;
        }
        .nav-cta:hover {
            background: var(--primary-dark);
            transform: translateY(-1px);
        }
        .nav-cta::after {
            display: none !important;
        }
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
            flex-direction: column;
            gap: 5px;
            z-index: 1001;
        }
        .mobile-menu-btn span {
            display: block;
            width: 24px;
            height: 2.5px;
            background: var(--text-main);
            border-radius: 3px;
            transition: var(--transition);
        }

        /* 主要内容区域 */
        main {
            flex: 1;
            padding: 100px 0 60px;
        }
        .page-header {
            text-align: center;
            margin-bottom: 50px;
        }
        .page-tag {
            display: inline-block;
            padding: 5px 14px;
            background: #eef2ff;
            color: var(--primary);
            border-radius: 18px;
            font-size: 0.82rem;
            font-weight: 600;
            margin-bottom: 14px;
            letter-spacing: 0.3px;
        }
        .page-header h1 {
            font-size: 2.5rem;
            font-weight: 800;
            margin-bottom: 14px;
            letter-spacing: -0.6px;
            color: var(--text-main);
        }
        .page-header h1 .gradient-text {
            background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 40%, #ec4899 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .page-subtitle {
            font-size: 1.1rem;
            color: var(--text-light);
            max-width: 620px;
            margin: 0 auto;
        }

        /* 下载卡片网格 */
        .download-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 28px;
            margin-bottom: 40px;
        }
        .download-card {
            background: #fff;
            border-radius: var(--radius);
            padding: 30px 28px;
            box-shadow: var(--shadow);
            border: 1px solid #f3f4f6;
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
            position: relative;
            overflow: hidden;
        }
        .download-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            opacity: 0;
            transition: opacity var(--transition);
        }
        .download-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
            border-color: #e0e7ff;
        }
        .download-card:hover::before {
            opacity: 1;
        }
        .os-icon {
            width: 56px;
            height: 56px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 18px;
            font-size: 1.8rem;
            background: #eef2ff;
            color: var(--primary);
        }
        .download-card h2 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .version-info {
            font-size: 0.85rem;
            color: var(--text-light);
            background: #f3f4f6;
            padding: 5px 12px;
            border-radius: 6px;
            display: inline-block;
            margin-bottom: 18px;
            font-weight: 500;
        }
        .system-req {
            background: #f8fafc;
            border-radius: 10px;
            padding: 14px 16px;
            margin-bottom: 20px;
            font-size: 0.9rem;
            color: var(--text-light);
        }
        .system-req strong {
            color: var(--text-main);
            display: block;
            margin-bottom: 6px;
            font-size: 0.9rem;
        }
        .system-req ul {
            list-style: none;
            padding-left: 0;
        }
        .system-req li {
            margin-bottom: 5px;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .system-req li::before {
            content: '✓';
            color: #10b981;
            font-weight: bold;
            font-size: 0.9rem;
        }
        .btn-group-card {
            display: flex;
            flex-direction: column;
            gap: 12px;
            margin-top: auto;
        }
        .btn {
            padding: 13px 24px;
            border-radius: 28px;
            font-weight: 600;
            font-size: 0.98rem;
            cursor: pointer;
            transition: all var(--transition);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            border: none;
            white-space: nowrap;
            text-decoration: none;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 8px 20px -8px rgba(79, 70, 229, 0.4);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 12px 28px -6px rgba(79, 70, 229, 0.5);
        }
        .btn-outline-dark {
            background: #1f2937;
            color: #fff;
            border: 2px solid #1f2937;
        }
        .btn-outline-dark:hover {
            background: #111827;
            border-color: #111827;
        }
        .github-link {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-weight: 500;
            font-size: 0.9rem;
            color: var(--text-light);
            background: #f9fafb;
            border-radius: 28px;
            padding: 10px 18px;
            border: 1px solid #e5e7eb;
            transition: all var(--transition);
        }
        .github-link:hover {
            border-color: #d1d5db;
            color: var(--text-main);
            background: #f3f4f6;
        }

        /* 操作流程步骤 */
        .steps-section {
            margin: 50px 0 40px;
        }
        .section-header {
            text-align: center;
            max-width: 680px;
            margin: 0 auto 40px;
        }
        .section-tag {
            display: inline-block;
            padding: 5px 14px;
            background: #eef2ff;
            color: var(--primary);
            border-radius: 18px;
            font-size: 0.82rem;
            font-weight: 600;
            margin-bottom: 14px;
            letter-spacing: 0.3px;
        }
        .section-header h2 {
            font-size: 2rem;
            font-weight: 750;
            margin-bottom: 12px;
            letter-spacing: -0.3px;
        }
        .section-header p {
            color: var(--text-light);
            font-size: 0.98rem;
        }
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
            gap: 20px;
            text-align: center;
        }
        .step-item {
            background: #fff;
            border-radius: var(--radius);
            padding: 24px 16px;
            box-shadow: var(--shadow-sm);
            border: 1px solid #f3f4f6;
            transition: var(--transition);
        }
        .step-item:hover {
            box-shadow: var(--shadow);
            border-color: #e0e7ff;
        }
        .step-number {
            display: inline-block;
            width: 36px;
            height: 36px;
            background: var(--primary);
            color: #fff;
            border-radius: 50%;
            font-weight: 700;
            font-size: 1.1rem;
            line-height: 36px;
            margin-bottom: 12px;
        }
        .step-item h3 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .step-item p {
            font-size: 0.82rem;
            color: var(--text-light);
            line-height: 1.5;
        }

        /* 提示条 */
        .alert-info {
            background: #eef2ff;
            border: 1px solid #c7d2fe;
            color: #3730a3;
            padding: 14px 20px;
            border-radius: 10px;
            font-size: 0.92rem;
            text-align: center;
            margin-top: 10px;
        }

        /* Footer (与首页一致) */
        footer {
            background: #111827;
            color: #9ca3af;
            padding: 55px 0 20px;
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 36px;
            margin-bottom: 36px;
            border-bottom: 1px solid #374151;
            padding-bottom: 36px;
        }
        .footer-brand h3 {
            color: #fff;
            font-size: 1.4rem;
            margin-bottom: 12px;
            font-weight: 700;
        }
        .footer-brand p {
            line-height: 1.7;
            font-size: 0.9rem;
            max-width: 280px;
        }
        .footer-col h4 {
            color: #fff;
            margin-bottom: 16px;
            font-size: 1rem;
            font-weight: 600;
        }
        .footer-col ul li {
            margin-bottom: 9px;
        }
        .footer-col a {
            font-size: 0.9rem;
        }
        .footer-col a:hover {
            color: #fff;
        }
        .copyright {
            text-align: center;
            font-size: 0.85rem;
            color: #6b7280;
        }

        @media (max-width: 768px) {
            .mobile-menu-btn {
                display: flex;
            }
            nav ul {
                position: fixed;
                top: 0;
                right: -100%;
                width: 260px;
                height: 100vh;
                background: #fff;
                flex-direction: column;
                padding: 80px 30px 30px;
                gap: 20px;
                box-shadow: var(--shadow-lg);
                transition: right var(--transition);
                z-index: 999;
            }
            nav ul.open {
                right: 0;
            }
            .download-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 480px) {
            .page-header h1 {
                font-size: 1.8rem;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .btn {
                padding: 11px 18px;
                font-size: 0.9rem;
            }
        }