:root {
            --zpa57-primary: #0078d4;
            --zpa57-secondary: #00c2ff;
            --zpa57-dark: #0a192f;
            --zpa57-bg-light: #f5f7fa;
            --zpa57-text-main: #2c3e50;
            --zpa57-text-muted: #64748b;
            --zpa57-white: #ffffff;
            --zpa57-accent: #64ffda;
            --zpa57-gradient: linear-gradient(135deg, #0078d4 0%, #00c2ff 100%);
        }

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

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
            color: var(--zpa57-text-main);
            background-color: var(--zpa57-bg-light);
            line-height: 1.7;
            overflow-x: hidden;
            word-break: break-word;
        }

        /* --- 导航栏 --- */
        .zpa57-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            z-index: 1000;
            box-shadow: 0 2px 20px rgba(0,0,0,0.05);
            border-bottom: 1px solid rgba(0,0,0,0.05);
        }

        .zpa57-nav-container {
            max-width: 1300px;
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 80px;
            flex-wrap: wrap;
        }

        .zpa57-logo {
            display: flex;
            align-items: center;
            min-width: 0;
        }

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

        .zpa57-nav-menu {
            display: flex;
            list-style: none;
            gap: 24px;
            flex-wrap: wrap;
            min-width: 0;
        }

        .zpa57-nav-menu a {
            text-decoration: none;
            color: var(--zpa57-text-main);
            font-weight: 500;
            font-size: 0.95rem;
            transition: color 0.3s ease;
            white-space: nowrap;
        }

        .zpa57-nav-menu a:hover,
        .zpa57-nav-menu a.zpa57-active {
            color: var(--zpa57-primary);
        }

        /* --- Hero 区域 (对角线切角设计) --- */
        .zpa57-hero {
            padding: 160px 24px 100px;
            background: var(--zpa57-dark);
            color: var(--zpa57-white);
            position: relative;
            overflow: hidden;
            display: flex;
            justify-content: center;
            align-items: center;
            text-align: center;
        }

        .zpa57-hero::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 60px;
            background: var(--zpa57-bg-light);
            clip-path: polygon(0 100%, 100% 100%, 100% 0);
        }

        .zpa57-hero-content {
            max-width: 900px;
            z-index: 2;
        }

        .zpa57-hero-title {
            font-size: clamp(2rem, 5vw + 1rem, 3.5rem);
            line-height: 1.2;
            margin-bottom: 24px;
            font-weight: 800;
            background: linear-gradient(to right, #fff, var(--zpa57-secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            word-break: keep-all;
        }

        .zpa57-hero-subtitle {
            font-size: clamp(1rem, 2vw + 0.5rem, 1.25rem);
            color: #a0aec0;
            margin-bottom: 40px;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

        /* --- 隧道视觉展示 --- */
        .zpa57-tunnel-visual {
            max-width: 1100px;
            margin: -40px auto 64px;
            background: var(--zpa57-white);
            border-radius: 24px;
            padding: 48px;
            box-shadow: 0 30px 60px rgba(0,0,0,0.1);
            position: relative;
            z-index: 5;
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            align-items: center;
        }

        .zpa57-viz-text {
            flex: 1;
            min-width: 300px;
        }

        .zpa57-viz-text h2 {
            font-size: 2rem;
            margin-bottom: 16px;
            color: var(--zpa57-dark);
        }

        .zpa57-viz-graphic {
            flex: 1;
            min-width: 300px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 40px;
            background: #f8fafc;
            border-radius: 16px;
            border: 2px dashed #cbd5e1;
        }

        .zpa57-viz-node {
            width: 80px;
            height: 80px;
            background: var(--zpa57-gradient);
            border-radius: 12px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            color: white;
            font-size: 0.7rem;
            font-weight: bold;
            text-align: center;
        }

        .zpa57-viz-arrow {
            flex-grow: 1;
            height: 2px;
            background: var(--zpa57-primary);
            position: relative;
            margin: 0 10px;
        }

        .zpa57-viz-arrow::after {
            content: '';
            position: absolute;
            right: 0;
            top: -4px;
            width: 10px;
            height: 10px;
            border-top: 2px solid var(--zpa57-primary);
            border-right: 2px solid var(--zpa57-primary);
            transform: rotate(45deg);
        }

        /* --- 协议矩阵网格 --- */
        .zpa57-matrix-section {
            max-width: 1300px;
            margin: 64px auto;
            padding: 0 24px;
        }

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

        .zpa57-matrix-card {
            background: var(--zpa57-white);
            padding: 32px;
            border-radius: 16px;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border-bottom: 4px solid transparent;
        }

        .zpa57-matrix-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.05);
            border-bottom-color: var(--zpa57-primary);
        }

        .zpa57-card-tag {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(0, 120, 212, 0.1);
            color: var(--zpa57-primary);
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .zpa57-matrix-card h3 {
            margin-bottom: 12px;
            font-size: 1.4rem;
        }

        .zpa57-protocol-list {
            margin-top: 16px;
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .zpa57-protocol-item {
            background: #edf2f7;
            padding: 4px 10px;
            border-radius: 4px;
            font-size: 0.85rem;
            color: #4a5568;
        }

        /* --- 内容区块 --- */
        .zpa57-content-section {
            padding: 80px 24px;
            max-width: 1100px;
            margin: 0 auto;
        }

        .zpa57-feature-row {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            align-items: center;
            margin-bottom: 80px;
        }

        .zpa57-feature-row:nth-child(even) {
            flex-direction: row-reverse;
        }

        .zpa57-feature-info {
            flex: 1;
            min-width: 300px;
        }

        .zpa57-feature-info h2 {
            font-size: 2.2rem;
            margin-bottom: 24px;
            position: relative;
        }

        .zpa57-feature-info h2::before {
            content: '';
            position: absolute;
            left: 0;
            bottom: -8px;
            width: 60px;
            height: 4px;
            background: var(--zpa57-gradient);
        }

        .zpa57-feature-visual {
            flex: 1;
            min-width: 300px;
            background: #e2e8f0;
            height: 300px;
            border-radius: 20px;
            display: flex;
            justify-content: center;
            align-items: center;
            font-style: italic;
            color: #64748b;
            position: relative;
            overflow: hidden;
            border: 1px solid #cbd5e1;
        }

        .zpa57-code-block {
            background: #1e293b;
            color: #e2e8f0;
            padding: 24px;
            border-radius: 12px;
            font-family: 'Consolas', monospace;
            font-size: 0.9rem;
            width: 100%;
        }

        /* --- 动态资讯区块 --- */
        .zpa57-dynamic-section {
            background: var(--zpa57-white);
            padding: 80px 24px;
        }

        .zpa57-section-title {
            text-align: center;
            margin-bottom: 48px;
        }

        .zpa57-article-list {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
        }

        .zpa57-article-item {
            flex: 1;
            min-width: 300px;
            padding: 24px;
            border: 1px solid #e2e8f0;
            border-radius: 12px;
        }

        /* --- 页脚 --- */
        .zpa57-footer {
            background: var(--zpa57-dark);
            color: #a0aec0;
            padding: 80px 24px 40px;
        }

        .zpa57-footer-grid {
            max-width: 1300px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            margin-bottom: 64px;
        }

        .zpa57-footer-brand h2 {
            color: white;
            margin-bottom: 16px;
        }

        .zpa57-footer-links h4 {
            color: white;
            margin-bottom: 24px;
        }

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

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

        .zpa57-footer-links a {
            color: #a0aec0;
            text-decoration: none;
            transition: color 0.3s;
        }

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

        .zpa57-copyright {
            text-align: center;
            padding-top: 40px;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.85rem;
        }

        /* --- 响应式调整 --- */
        @media (max-width: 768px) {
            .zpa57-nav-container {
                height: auto;
                padding: 16px;
            }
            .zpa57-nav-menu {
                margin-top: 16px;
                gap: 12px;
                justify-content: center;
                width: 100%;
            }
            .zpa57-hero {
                padding-top: 180px;
            }
            .zpa57-feature-row {
                flex-direction: column !important;
            }
        }