:root {
            --zpa57-primary: #2c3e50;
            --zpa57-accent: #3498db;
            --zpa57-success: #27ae60;
            --zpa57-warning: #f39c12;
            --zpa57-text: #333;
            --zpa57-light: #f8f9fa;
            --zpa57-white: #ffffff;
            --zpa57-shadow: 0 10px 30px rgba(0,0,0,0.1);
            --zpa57-radius: 12px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            line-height: 1.7;
            color: var(--zpa57-text);
            background-color: #fff;
            overflow-x: hidden;
        }

        /* 导航栏 */
        .zpa57-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
        }

        .zpa57-nav-container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            height: 80px;
        }

        .zpa57-logo {
            flex: 0 0 auto;
            min-width: 0;
        }

        .zpa57-logo img {
            height: 40px;
            width: auto;
        }

        .zpa57-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 16px;
            min-width: 0;
        }

        .zpa57-menu li {
            min-width: 0;
        }

        .zpa57-menu a {
            text-decoration: none;
            color: var(--zpa57-primary);
            font-weight: 500;
            font-size: 15px;
            padding: 8px 12px;
            border-radius: 6px;
            transition: all 0.3s ease;
            white-space: nowrap;
        }

        .zpa57-menu a:hover {
            color: var(--zpa57-accent);
            background: rgba(52, 152, 219, 0.05);
        }

        .zpa57-menu a.active {
            color: var(--zpa57-white);
            background: var(--zpa57-accent);
        }

        /* Hero 区域 */
        .zpa57-hero {
            padding: 160px 24px 80px;
            background: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .zpa57-hero-inner {
            max-width: 900px;
            margin: 0 auto;
        }

        .zpa57-hero h1 {
            font-size: clamp(2rem, 5vw, 3.5rem);
            line-height: 1.2;
            color: var(--zpa57-primary);
            margin-bottom: 24px;
            word-break: keep-all;
        }

        .zpa57-hero p {
            font-size: clamp(1rem, 2vw + 0.5rem, 1.25rem);
            color: #666;
            margin-bottom: 40px;
            word-break: break-word;
        }

        /* SFTP 可视化面板 */
        .zpa57-visual-panel {
            max-width: 1100px;
            margin: 40px auto 0;
            background: var(--zpa57-white);
            border-radius: 20px;
            box-shadow: 0 30px 60px rgba(0,0,0,0.12);
            display: flex;
            flex-wrap: wrap;
            overflow: hidden;
            border: 1px solid rgba(0,0,0,0.05);
        }

        .zpa57-panel-side {
            flex: 1;
            min-width: 300px;
            padding: 32px;
            text-align: left;
        }

        .zpa57-panel-local {
            background: #fcfcfc;
            border-right: 1px dashed #ddd;
        }

        .zpa57-panel-remote {
            background: #fff;
        }

        .zpa57-panel-header {
            display: flex;
            justify-content: space-between;
            margin-bottom: 20px;
            border-bottom: 2px solid #eee;
            padding-bottom: 10px;
            font-weight: bold;
            color: var(--zpa57-accent);
        }

        .zpa57-file-item {
            display: flex;
            align-items: center;
            padding: 10px;
            margin-bottom: 8px;
            background: #fff;
            border-radius: 8px;
            border: 1px solid #eee;
            transition: transform 0.2s;
        }

        .zpa57-file-item:hover {
            transform: translateX(5px);
            border-color: var(--zpa57-accent);
        }

        /* 核心矩阵区块 */
        .zpa57-section {
            padding: 96px 24px;
            max-width: 1400px;
            margin: 0 auto;
        }

        .zpa57-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
            margin-top: 48px;
        }

        .zpa57-card {
            background: var(--zpa57-white);
            padding: 40px;
            border-radius: var(--zpa57-radius);
            box-shadow: 0 4px 20px rgba(0,0,0,0.05);
            transition: all 0.3s ease;
            border: 1px solid #f0f0f0;
            min-width: 0;
            word-break: break-word;
        }

        .zpa57-card:hover {
            transform: translateY(-10px);
            box-shadow: var(--zpa57-shadow);
        }

        .zpa57-card-icon {
            font-size: 40px;
            margin-bottom: 24px;
            display: block;
        }

        .zpa57-card h3 {
            margin-bottom: 16px;
            font-size: 1.5rem;
            color: var(--zpa57-primary);
        }

        /* 协议矩阵表格 */
        .zpa57-matrix-container {
            overflow-x: auto;
            margin-top: 40px;
            border-radius: var(--zpa57-radius);
            box-shadow: var(--zpa57-shadow);
        }

        .zpa57-matrix-table {
            width: 100%;
            border-collapse: collapse;
            background: white;
            min-width: 800px;
        }

        .zpa57-matrix-table th, .zpa57-matrix-table td {
            padding: 20px;
            text-align: left;
            border-bottom: 1px solid #eee;
        }

        .zpa57-matrix-table th {
            background: var(--zpa57-primary);
            color: white;
        }

        .zpa57-tag {
            display: inline-block;
            padding: 4px 12px;
            background: #e1f5fe;
            color: #0288d1;
            border-radius: 20px;
            font-size: 12px;
            margin-right: 5px;
            margin-bottom: 5px;
        }

        /* 呼吁行动区 */
        .zpa57-cta {
            background: var(--zpa57-primary);
            color: white;
            text-align: center;
            padding: 80px 24px;
            margin-top: 64px;
        }

        .zpa57-btn {
            display: inline-block;
            padding: 16px 40px;
            background: var(--zpa57-accent);
            color: white;
            text-decoration: none;
            border-radius: 50px;
            font-weight: bold;
            font-size: 18px;
            transition: all 0.3s;
            margin-top: 32px;
        }

        .zpa57-btn:hover {
            background: #2980b9;
            transform: scale(1.05);
        }

        /* 页脚 */
        .zpa57-footer {
            background: #1a252f;
            color: #bdc3c7;
            padding: 64px 24px;
        }

        .zpa57-footer-grid {
            max-width: 1400px;
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
        }

        .zpa57-footer-col {
            flex: 1;
            min-width: 240px;
        }

        .zpa57-footer-brand {
            font-size: 24px;
            font-weight: bold;
            color: white;
            margin-bottom: 20px;
        }

        .zpa57-footer-links {
            list-style: none;
        }

        .zpa57-footer-links li {
            margin-bottom: 12px;
        }

        .zpa57-footer-links a {
            color: #bdc3c7;
            text-decoration: none;
            transition: color 0.3s;
        }

        .zpa57-footer-links a:hover {
            color: var(--zpa57-accent);
        }

        @media (max-width: 768px) {
            .zpa57-nav-container {
                height: auto;
                padding: 16px;
            }
            .zpa57-menu {
                width: 100%;
                margin-top: 16px;
                justify-content: center;
            }
            .zpa57-hero {
                padding-top: 120px;
            }
            .zpa57-panel-side {
                border-right: none;
                border-bottom: 1px dashed #ddd;
            }
        }