:root {
            --mldow-primary: #3498db;
            --mldow-secondary: #2c3e50;
            --mldow-accent: #e67e22;
            --mldow-bg-dark: #0f172a;
            --mldow-bg-light: #f8fafc;
            --mldow-text-main: #1e293b;
            --mldow-text-muted: #64748b;
            --mldow-white: #ffffff;
            --mldow-radius: 12px;
            --mldow-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            line-height: 1.6;
            color: var(--mldow-text-main);
            background-color: var(--mldow-bg-light);
            word-break: keep-all;
            overflow-x: hidden;
        }

        .mldow-container {
            max-width: 1300px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* 导航栏 */
        .mldow-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            padding: 12px 0;
        }

        .mldow-nav-wrapper {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

        .mldow-logo {
            flex-shrink: 0;
            min-width: 0;
        }

        .mldow-logo img {
            height: 48px;
            width: auto;
            display: block;
        }

        .mldow-nav-menu {
            display: flex;
            list-style: none;
            gap: 16px;
            flex-wrap: wrap;
            min-width: 0;
        }

        .mldow-nav-item a {
            text-decoration: none;
            color: var(--mldow-text-main);
            font-weight: 500;
            font-size: 0.95rem;
            padding: 8px 12px;
            border-radius: 6px;
            transition: var(--mldow-transition);
            white-space: nowrap;
        }

        .mldow-nav-item a:hover {
            color: var(--mldow-primary);
            background: rgba(52, 152, 219, 0.05);
        }

        .mldow-nav-item a.active {
            color: var(--mldow-white);
            background: var(--mldow-primary);
        }

        /* Hero 区块 - 独特非对称布局 */
        .mldow-hero {
            padding: 96px 0;
            background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
            color: var(--mldow-white);
            position: relative;
            overflow: hidden;
        }

        .mldow-hero::before {
            content: '';
            position: absolute;
            top: -20%;
            right: -10%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(52, 152, 219, 0.15) 0%, transparent 70%);
            pointer-events: none;
        }

        .mldow-hero-grid {
            display: flex;
            align-items: center;
            gap: 48px;
            flex-wrap: wrap;
        }

        .mldow-hero-content {
            flex: 1;
            min-width: 320px;
        }

        .mldow-hero-title {
            font-size: clamp(2rem, 4vw + 1rem, 3.5rem);
            line-height: 1.2;
            margin-bottom: 24px;
            font-weight: 800;
            word-break: break-word;
        }

        .mldow-hero-subtitle {
            font-size: clamp(1rem, 1.5vw + 0.5rem, 1.25rem);
            color: #94a3b8;
            margin-bottom: 40px;
            max-width: 650px;
            line-height: 1.8;
        }

        .mldow-hero-visual {
            flex: 0.8;
            min-width: 320px;
            position: relative;
        }

        .mldow-hero-visual img {
            width: 100%;
            height: auto;
            border-radius: var(--mldow-radius);
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
            transform: perspective(1000px) rotateY(-5deg) rotateX(2deg);
            transition: var(--mldow-transition);
        }

        .mldow-hero-visual img:hover {
            transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
        }

        /* 下载版本对比卡片 */
        .mldow-section {
            padding: 80px 0;
        }

        .mldow-section-title {
            text-align: center;
            font-size: clamp(1.5rem, 3vw, 2.5rem);
            margin-bottom: 64px;
            color: var(--mldow-secondary);
        }

        .mldow-version-grid {
            display: flex;
            gap: 32px;
            flex-wrap: wrap;
            justify-content: center;
        }

        .mldow-version-card {
            flex: 1;
            min-width: 300px;
            max-width: 450px;
            background: var(--mldow-white);
            border-radius: 20px;
            padding: 48px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
            border: 1px solid rgba(0,0,0,0.05);
            transition: var(--mldow-transition);
            display: flex;
            flex-direction: column;
        }

        .mldow-version-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
        }

        .mldow-version-card.mldow-pro {
            border: 2px solid var(--mldow-primary);
            background: linear-gradient(to bottom, #ffffff, #f0f7ff);
            position: relative;
        }

        .mldow-pro-badge {
            position: absolute;
            top: 20px;
            right: 20px;
            background: var(--mldow-accent);
            color: white;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: bold;
        }

        .mldow-card-icon {
            font-size: 3rem;
            margin-bottom: 24px;
        }

        .mldow-card-title {
            font-size: 1.75rem;
            margin-bottom: 16px;
        }

        .mldow-card-price {
            font-size: 2.5rem;
            font-weight: 800;
            margin-bottom: 24px;
            color: var(--mldow-primary);
        }

        .mldow-card-list {
            list-style: none;
            margin-bottom: 40px;
            flex-grow: 1;
        }

        .mldow-card-list li {
            margin-bottom: 12px;
            padding-left: 28px;
            position: relative;
            color: var(--mldow-text-muted);
        }

        .mldow-card-list li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: #10b981;
            font-weight: bold;
        }

        .mldow-btn {
            display: inline-block;
            text-align: center;
            padding: 16px 32px;
            border-radius: 8px;
            font-weight: bold;
            text-decoration: none;
            transition: var(--mldow-transition);
            cursor: pointer;
        }

        .mldow-btn-primary {
            background: var(--mldow-primary);
            color: white;
        }

        .mldow-btn-primary:hover {
            background: #2980b9;
            box-shadow: 0 5px 15px rgba(52, 152, 219, 0.4);
        }

        .mldow-btn-outline {
            border: 2px solid var(--mldow-primary);
            color: var(--mldow-primary);
        }

        .mldow-btn-outline:hover {
            background: var(--mldow-primary);
            color: white;
        }

        /* 协议核心 Nexus 区块 */
        .mldow-nexus {
            background: var(--mldow-secondary);
            color: white;
            padding: 96px 0;
        }

        .mldow-nexus-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
        }

        .mldow-nexus-item {
            background: rgba(255,255,255,0.05);
            padding: 40px;
            border-radius: var(--mldow-radius);
            border: 1px solid rgba(255,255,255,0.1);
        }

        .mldow-nexus-tag {
            color: var(--mldow-accent);
            text-transform: uppercase;
            letter-spacing: 1.5px;
            font-size: 0.8rem;
            margin-bottom: 16px;
            display: block;
        }

        .mldow-nexus-title {
            font-size: 1.5rem;
            margin-bottom: 20px;
        }

        .mldow-nexus-engines {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 20px;
        }

        .mldow-engine-chip {
            background: rgba(52, 152, 219, 0.2);
            padding: 4px 12px;
            border-radius: 4px;
            font-size: 0.85rem;
        }

        /* 安装流程图文 */
        .mldow-steps {
            background: white;
        }

        .mldow-step-row {
            display: flex;
            align-items: center;
            gap: 64px;
            flex-wrap: wrap;
            margin-bottom: 80px;
        }

        .mldow-step-row:nth-child(even) {
            flex-direction: row-reverse;
        }

        .mldow-step-text {
            flex: 1;
            min-width: 300px;
        }

        .mldow-step-img {
            flex: 1.2;
            min-width: 320px;
        }

        .mldow-step-img img {
            width: 100%;
            height: auto;
            border-radius: var(--mldow-radius);
            box-shadow: 0 15px 35px rgba(0,0,0,0.1);
        }

        .mldow-step-number {
            font-size: 3rem;
            font-weight: 900;
            color: rgba(52, 152, 219, 0.1);
            line-height: 1;
        }

        /* 版本对比背景图区域 */
        .mldow-compare-visual {
            background: linear-gradient(rgba(15, 23, 42, 0.8), rgba(15, 23, 42, 0.8)), url('images/download_version_compare.jpg');
            background-size: cover;
            background-attachment: fixed;
            padding: 100px 0;
            color: white;
            text-align: center;
        }

        /* 页脚 */
        .mldow-footer {
            background: #0f172a;
            color: #94a3b8;
            padding: 64px 0 32px;
        }

        .mldow-footer-grid {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 48px;
            margin-bottom: 48px;
        }

        .mldow-footer-brand h2 {
            color: white;
            margin-bottom: 16px;
        }

        .mldow-footer-links h4 {
            color: white;
            margin-bottom: 20px;
        }

        .mldow-footer-links ul {
            list-style: none;
        }

        .mldow-footer-links li {
            margin-bottom: 10px;
        }

        .mldow-footer-links a {
            color: #94a3b8;
            text-decoration: none;
            transition: var(--mldow-transition);
        }

        .mldow-footer-links a:hover {
            color: var(--mldow-primary);
        }

        .mldow-copyright {
            text-align: center;
            padding-top: 32px;
            border-top: 1px solid rgba(255,255,255,0.05);
            font-size: 0.9rem;
        }

        /* 响应式断点 */
        @media (max-width: 768px) {
            .mldow-hero-grid, .mldow-step-row, .mldow-nav-wrapper {
                flex-direction: column;
                text-align: center;
            }

            .mldow-nav-menu {
                justify-content: center;
                margin-top: 20px;
            }

            .mldow-hero-subtitle {
                margin-left: auto;
                margin-right: auto;
            }

            .mldow-step-row:nth-child(even) {
                flex-direction: column;
            }
        }