:root {
            --zpa57-primary: #ec7c26;
            --zpa57-primary-dark: #d36a1d;
            --zpa57-secondary: #2c3e50;
            --zpa57-accent: #3498db;
            --zpa57-text: #333333;
            --zpa57-text-light: #666666;
            --zpa57-bg-light: #f4f7f9;
            --zpa57-white: #ffffff;
            --zpa57-gap: 8px;
            --zpa57-container-width: 1400px;
        }

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

        body {
            font-family: "Inter", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            line-height: 1.6;
            color: var(--zpa57-text);
            background-color: var(--zpa57-bg-light);
            word-break: keep-all;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.3s ease;
        }

        ul {
            list-style: none;
        }

        /* 导航栏设计 */
        .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);
            height: 80px;
            display: flex;
            align-items: center;
        }

        .zpa57-nav-container {
            max-width: var(--zpa57-container-width);
            margin: 0 auto;
            width: 100%;
            padding: 0 32px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

        .zpa57-logo {
            flex-shrink: 0;
        }

        .zpa57-logo img {
            height: 45px;
            display: block;
        }

        .zpa57-nav-menu {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
        }

        .zpa57-nav-item {
            font-weight: 500;
            font-size: 15px;
            color: var(--zpa57-secondary);
            padding: 8px 0;
            position: relative;
        }

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

        .zpa57-nav-item.zpa57-active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: var(--zpa57-primary);
            border-radius: 2px;
        }

        /* Hero 区 - 独特对比视角 */
        .zpa57-hero {
            padding: 160px 32px 80px;
            background: linear-gradient(135deg, #2c3e50 0%, #000000 100%);
            color: var(--zpa57-white);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .zpa57-hero::before {
            content: "VS";
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            font-size: 30vw;
            font-weight: 900;
            opacity: 0.03;
            pointer-events: none;
        }

        .zpa57-hero-content {
            max-width: 900px;
            margin: 0 auto;
            position: relative;
            z-index: 2;
        }

        .zpa57-hero-title {
            font-size: clamp(2rem, 5vw + 1rem, 4rem);
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 24px;
            word-break: break-word;
        }

        .zpa57-hero-subtitle {
            font-size: clamp(1rem, 1.5vw + 0.5rem, 1.4rem);
            opacity: 0.9;
            margin-bottom: 48px;
            line-height: 1.8;
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
            word-break: break-word;
        }

        /* 核心对比卡片布局 */
        .zpa57-comparison-grid {
            max-width: var(--zpa57-container-width);
            margin: -60px auto 80px;
            padding: 0 32px;
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            justify-content: center;
        }

        .zpa57-comp-card {
            flex: 1;
            min-width: 320px;
            background: var(--zpa57-white);
            border-radius: 24px;
            padding: 48px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.08);
            transition: transform 0.3s ease;
            position: relative;
            overflow: hidden;
            border-top: 8px solid transparent;
        }

        .zpa57-comp-card:hover {
            transform: translateY(-10px);
        }

        .zpa57-comp-card.zpa57-moba {
            border-top-color: var(--zpa57-primary);
        }

        .zpa57-comp-card.zpa57-xshell {
            border-top-color: #999;
        }

        .zpa57-brand-tag {
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 2px;
            margin-bottom: 16px;
            display: block;
        }

        .zpa57-moba .zpa57-brand-tag { color: var(--zpa57-primary); }
        .zpa57-xshell .zpa57-brand-tag { color: var(--zpa57-text-light); }

        .zpa57-comp-title {
            font-size: 28px;
            margin-bottom: 24px;
        }

        .zpa57-check-list {
            margin-top: 32px;
        }

        .zpa57-check-item {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            margin-bottom: 16px;
            font-size: 16px;
            word-break: break-word;
        }

        .zpa57-check-item b {
            color: var(--zpa57-primary);
        }

        /* 协议矩阵区块 */
        .zpa57-section-matrix {
            padding: 80px 32px;
            background-color: var(--zpa57-white);
        }

        .zpa57-matrix-container {
            max-width: 1100px;
            margin: 0 auto;
        }

        .zpa57-section-header {
            text-align: center;
            margin-bottom: 64px;
        }

        .zpa57-section-title {
            font-size: clamp(1.5rem, 3vw + 0.5rem, 2.5rem);
            margin-bottom: 16px;
        }

        .zpa57-matrix-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 24px;
        }

        .zpa57-matrix-item {
            background: var(--zpa57-bg-light);
            padding: 32px;
            border-radius: 16px;
            min-width: 0;
        }

        .zpa57-matrix-category {
            font-size: 14px;
            font-weight: 700;
            color: var(--zpa57-primary);
            margin-bottom: 12px;
            text-transform: uppercase;
        }

        .zpa57-matrix-protocols {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 16px;
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .zpa57-protocol-tag {
            background: rgba(236, 124, 38, 0.1);
            color: var(--zpa57-primary);
            padding: 2px 10px;
            border-radius: 4px;
            font-size: 14px;
        }

        .zpa57-matrix-desc {
            font-size: 15px;
            color: var(--zpa57-text-light);
            word-break: break-word;
        }

        /* 深度对比表格 */
        .zpa57-table-section {
            padding: 80px 32px;
        }

        .zpa57-table-wrapper {
            max-width: var(--zpa57-container-width);
            margin: 0 auto;
            background: var(--zpa57-white);
            border-radius: 20px;
            overflow-x: auto;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
        }

        table {
            width: 100%;
            border-collapse: collapse;
            min-width: 800px;
        }

        th, td {
            padding: 24px;
            text-align: left;
            border-bottom: 1px solid #eee;
        }

        th {
            background: #fafafa;
            font-weight: 700;
            color: var(--zpa57-secondary);
        }

        .zpa57-highlight {
            background: rgba(236, 124, 38, 0.03);
            font-weight: 600;
            color: var(--zpa57-primary);
        }

        /* CTA 区块 */
        .zpa57-cta {
            padding: 100px 32px;
            background: var(--zpa57-secondary);
            color: var(--zpa57-white);
            text-align: center;
        }

        .zpa57-cta-btn {
            display: inline-block;
            background: var(--zpa57-primary);
            color: var(--zpa57-white);
            padding: 18px 48px;
            border-radius: 50px;
            font-size: 18px;
            font-weight: 700;
            margin-top: 32px;
            box-shadow: 0 10px 20px rgba(236, 124, 38, 0.3);
        }

        .zpa57-cta-btn:hover {
            background: var(--zpa57-primary-dark);
            transform: scale(1.05);
        }

        /* 页脚 */
        .zpa57-footer {
            background: #1a252f;
            color: rgba(255,255,255,0.7);
            padding: 64px 32px 32px;
        }

        .zpa57-footer-grid {
            max-width: var(--zpa57-container-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            justify-content: space-between;
        }

        .zpa57-footer-col {
            flex: 1;
            min-width: 200px;
        }

        .zpa57-footer-brand {
            font-size: 24px;
            font-weight: 800;
            color: var(--zpa57-white);
            margin-bottom: 24px;
        }

        .zpa57-footer-links a {
            display: block;
            margin-bottom: 12px;
        }

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

        .zpa57-copyright {
            max-width: var(--zpa57-container-width);
            margin: 48px auto 0;
            padding-top: 32px;
            border-top: 1px solid rgba(255,255,255,0.1);
            text-align: center;
            font-size: 14px;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .zpa57-nav-menu {
                display: none; /* 简化演示，实际应有汉堡菜单 */
            }
            .zpa57-header { height: 60px; }
            .zpa57-hero { padding-top: 100px; }
            .zpa57-comp-card { min-width: 100%; }
        }