:root {
            --mldow-primary: #3498db;
            --mldow-secondary: #2c3e50;
            --mldow-accent: #1abc9c;
            --mldow-bg-light: #f8fafc;
            --mldow-text-dark: #1e293b;
            --mldow-text-muted: #64748b;
            --mldow-white: #ffffff;
            --mldow-shadow: 0 10px 30px rgba(0,0,0,0.08);
            --mldow-radius: 12px;
            --mldow-container-width: 1100px;
        }

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

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

        /* 导航栏 */
        .mldow-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            box-shadow: var(--mldow-shadow);
        }

        .mldow-nav-container {
            max-width: var(--mldow-container-width);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 72px;
            flex-wrap: wrap;
        }

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

        .mldow-logo img {
            height: 40px;
            width: auto;
            display: block;
        }

        .mldow-nav-menu {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
            gap: 8px;
        }

        .mldow-nav-item a {
            text-decoration: none;
            color: var(--mldow-text-dark);
            font-size: 14px;
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 6px;
            transition: all 0.3s ease;
        }

        .mldow-nav-item a:hover {
            background: rgba(52, 152, 219, 0.1);
            color: var(--mldow-primary);
        }

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

        /* Hero 区域 */
        .mldow-hero {
            padding: 160px 24px 80px;
            background: linear-gradient(135deg, #2c3e50 0%, #3498db 100%);
            color: var(--mldow-white);
            position: relative;
            overflow: hidden;
            clip-path: polygon(0 0, 100% 0, 100% 90%, 0 100%);
        }

        .mldow-hero-inner {
            max-width: 900px;
            margin: 0 auto;
            text-align: center;
            position: relative;
            z-index: 2;
        }

        .mldow-hero-title {
            font-size: clamp(2rem, 5vw, 3.5rem);
            font-weight: 800;
            margin-bottom: 24px;
            line-height: 1.2;
            word-break: break-word;
        }

        .mldow-hero-subtitle {
            font-size: clamp(1rem, 2vw + 0.5rem, 1.25rem);
            opacity: 0.9;
            max-width: 700px;
            margin: 0 auto 40px;
            word-break: break-word;
        }

        /* 教程主体内容 */
        .mldow-main {
            max-width: var(--mldow-container-width);
            margin: -60px auto 80px;
            padding: 0 24px;
            position: relative;
            z-index: 10;
        }

        .mldow-guide-card {
            background: var(--mldow-white);
            border-radius: var(--mldow-radius);
            padding: 48px;
            box-shadow: var(--mldow-shadow);
        }

        .mldow-section-title {
            font-size: 2rem;
            margin-bottom: 32px;
            border-left: 6px solid var(--mldow-primary);
            padding-left: 16px;
            color: var(--mldow-secondary);
        }

        .mldow-step-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
            margin-bottom: 64px;
        }

        .mldow-step-item {
            min-width: 0;
            padding: 32px;
            background: #fcfdfe;
            border: 1px solid #edf2f7;
            border-radius: var(--mldow-radius);
            transition: transform 0.3s ease;
        }

        .mldow-step-item:hover {
            transform: translateY(-5px);
            border-color: var(--mldow-primary);
        }

        .mldow-step-number {
            width: 40px;
            height: 40px;
            background: var(--mldow-primary);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            margin-bottom: 20px;
        }

        .mldow-step-text h3 {
            font-size: 1.25rem;
            margin-bottom: 12px;
            color: var(--mldow-secondary);
        }

        .mldow-step-text p {
            font-size: 0.95rem;
            color: var(--mldow-text-muted);
            line-height: 1.7;
        }

        /* 协议展示区 */
        .mldow-nexus-section {
            padding: 80px 0;
            background: #fff;
            border-radius: var(--mldow-radius);
            margin-top: 48px;
        }

        .mldow-nexus-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
        }

        .mldow-nexus-card {
            flex: 1;
            min-width: 300px;
            background: #f8fafc;
            padding: 32px;
            border-radius: var(--mldow-radius);
            border: 1px dashed #cbd5e1;
        }

        .mldow-nexus-card h4 {
            color: var(--mldow-primary);
            margin-bottom: 16px;
            font-size: 1.1rem;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

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

        .mldow-engine-tag {
            background: #e2e8f0;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
        }

        .mldow-highlight-box {
            background: #f1f5f9;
            padding: 16px;
            border-radius: 8px;
            font-size: 0.9rem;
            color: var(--mldow-secondary);
            border-left: 3px solid var(--mldow-accent);
        }

        /* 页脚 */
        .mldow-footer {
            background: var(--mldow-secondary);
            color: rgba(255,255,255,0.7);
            padding: 64px 24px;
            text-align: center;
        }

        .mldow-footer-brand {
            font-size: 24px;
            font-weight: 700;
            color: var(--mldow-white);
            margin-bottom: 16px;
        }

        .mldow-footer-links {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 24px;
            margin-bottom: 32px;
        }

        .mldow-footer-links a {
            color: rgba(255,255,255,0.6);
            text-decoration: none;
            font-size: 14px;
        }

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

        /* 响应式调整 */
        @media (max-width: 768px) {
            .mldow-nav-container {
                height: auto;
                padding: 16px;
            }
            .mldow-nav-menu {
                justify-content: center;
                margin-top: 16px;
            }
            .mldow-hero {
                padding-top: 120px;
            }
            .mldow-guide-card {
                padding: 24px;
            }
            .mldow-step-grid {
                grid-template-columns: 1fr;
            }
        }