:root {
            --zpa57-primary: #004c99;
            --zpa57-secondary: #007bff;
            --zpa57-accent: #28a745;
            --zpa57-dark: #1a1a1a;
            --zpa57-light: #f8f9fa;
            --zpa57-text: #333333;
            --zpa57-gray: #6c757d;
            --zpa57-border: #e0e0e0;
            --zpa57-spacing: 8px;
            --zpa57-radius: 12px;
            --zpa57-shadow: 0 4px 20px rgba(0,0,0,0.08);
            --zpa57-container-width: 1100px;
        }

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

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

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

        .zpa57-nav-container {
            max-width: var(--zpa57-container-width);
            margin: 0 auto;
            padding: 0 calc(var(--zpa57-spacing) * 3);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

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

        .zpa57-logo img {
            height: 40px;
            display: block;
        }

        .zpa57-nav-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: calc(var(--zpa57-spacing) * 2);
            min-width: 0;
        }

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

        .zpa57-nav-menu a {
            text-decoration: none;
            color: var(--zpa57-text);
            font-weight: 500;
            font-size: 0.95rem;
            padding: 8px 12px;
            border-radius: 6px;
            transition: all 0.3s ease;
        }

        .zpa57-nav-menu a:hover,
        .zpa57-nav-menu a.active {
            color: var(--zpa57-primary);
            background: rgba(0, 76, 153, 0.05);
        }

        /* Hero 区域 - 独特对角线分割设计 */
        .zpa57-hero {
            padding: 160px 0 100px;
            background: linear-gradient(135deg, #004c99 0%, #002d5c 100%);
            color: white;
            position: relative;
            overflow: hidden;
        }

        .zpa57-hero::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 80px;
            background: white;
            clip-path: polygon(0 100%, 100% 100%, 100% 0);
        }

        .zpa57-hero-content {
            max-width: var(--zpa57-container-width);
            margin: 0 auto;
            padding: 0 calc(var(--zpa57-spacing) * 3);
            display: flex;
            flex-wrap: wrap;
            align-items: center;
        }

        .zpa57-hero-text {
            flex: 1;
            min-width: 300px;
            word-break: break-word;
        }

        .zpa57-hero-text h1 {
            font-size: clamp(2rem, 4vw + 1rem, 3.5rem);
            line-height: 1.2;
            margin-bottom: 24px;
        }

        .zpa57-hero-text p {
            font-size: clamp(1.1rem, 1vw + 0.5rem, 1.3rem);
            opacity: 0.9;
            margin-bottom: 32px;
            max-width: 600px;
        }

        /* 教程主体内容 */
        .zpa57-main-content {
            max-width: var(--zpa57-container-width);
            margin: 40px auto;
            padding: 0 calc(var(--zpa57-spacing) * 3);
        }

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

        .zpa57-section-title h2 {
            font-size: clamp(1.5rem, 3vw, 2.2rem);
            color: var(--zpa57-dark);
            margin-bottom: 16px;
        }

        .zpa57-section-title .zpa57-divider {
            width: 60px;
            height: 4px;
            background: var(--zpa57-secondary);
            margin: 0 auto;
            border-radius: 2px;
        }

        /* 步骤卡片 */
        .zpa57-step-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
            margin-bottom: 64px;
        }

        .zpa57-step-card {
            background: white;
            padding: 40px;
            border-radius: var(--zpa57-radius);
            box-shadow: var(--zpa57-shadow);
            border: 1px solid var(--zpa57-border);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            position: relative;
            overflow: hidden;
            min-width: 0;
        }

        .zpa57-step-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 30px rgba(0,0,0,0.12);
        }

        .zpa57-step-number {
            font-size: 4rem;
            font-weight: 900;
            color: rgba(0, 76, 153, 0.05);
            position: absolute;
            top: -10px;
            right: 10px;
            line-height: 1;
        }

        .zpa57-step-card h3 {
            margin-bottom: 16px;
            color: var(--zpa57-primary);
            font-size: 1.4rem;
            position: relative;
        }

        .zpa57-step-card p {
            color: var(--zpa57-gray);
            font-size: 1rem;
            line-height: 1.6;
        }

        /* 详细步骤展示区块 */
        .zpa57-guide-section {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            align-items: center;
            margin-bottom: 96px;
        }

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

        .zpa57-guide-text {
            flex: 1;
            min-width: 300px;
            word-break: break-word;
        }

        .zpa57-guide-text h3 {
            font-size: 1.8rem;
            margin-bottom: 24px;
            color: var(--zpa57-dark);
        }

        .zpa57-guide-text ul {
            list-style: none;
        }

        .zpa57-guide-text li {
            margin-bottom: 12px;
            padding-left: 28px;
            position: relative;
        }

        .zpa57-guide-text li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--zpa57-accent);
            font-weight: bold;
        }

        .zpa57-visual-box {
            flex: 1;
            min-width: 300px;
            background: #f0f4f8;
            border-radius: var(--zpa57-radius);
            padding: 32px;
            border: 1px solid var(--zpa57-border);
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        /* 模拟 UI 代码块 */
        .zpa57-mock-ui {
            background: #2d2d2d;
            border-radius: 8px;
            padding: 20px;
            color: #dcdcdc;
            font-family: "Consolas", monospace;
            font-size: 0.9rem;
            box-shadow: inset 0 2px 10px rgba(0,0,0,0.2);
        }

        .zpa57-mock-line {
            margin-bottom: 8px;
        }

        .zpa57-highlight {
            color: #4fc3f7;
        }

        /* 提示区块 */
        .zpa57-info-alert {
            background: #e7f3ff;
            border-left: 5px solid var(--zpa57-secondary);
            padding: 24px;
            border-radius: 0 var(--zpa57-radius) var(--zpa57-radius) 0;
            margin: 48px 0;
        }

        /* 动态内容标记 */
        .zpa57-dynamic-area {
            background: var(--zpa57-light);
            padding: 64px 0;
            margin-top: 64px;
        }

        /* 页脚 */
        .zpa57-footer {
            background: var(--zpa57-dark);
            color: white;
            padding: 80px 0 40px;
        }

        .zpa57-footer-grid {
            max-width: var(--zpa57-container-width);
            margin: 0 auto;
            padding: 0 calc(var(--zpa57-spacing) * 3);
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
        }

        .zpa57-footer-brand h4 {
            font-size: 1.5rem;
            margin-bottom: 16px;
        }

        .zpa57-footer-brand p {
            opacity: 0.6;
            font-size: 0.9rem;
        }

        .zpa57-footer-links h5 {
            margin-bottom: 24px;
            font-size: 1.1rem;
        }

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

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

        .zpa57-footer-links a {
            color: rgba(255,255,255,0.7);
            text-decoration: none;
            transition: color 0.3s;
        }

        .zpa57-footer-links a:hover {
            color: white;
        }

        .zpa57-copyright {
            text-align: center;
            padding-top: 48px;
            margin-top: 48px;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.85rem;
            opacity: 0.5;
        }

        /* 响应式适配 */
        @media (max-width: 768px) {
            .zpa57-nav-container {
                flex-direction: column;
                gap: 16px;
            }
            .zpa57-nav-menu {
                justify-content: center;
            }
            .zpa57-hero {
                padding: 120px 0 60px;
                text-align: center;
            }
            .zpa57-hero-content {
                justify-content: center;
            }
            .zpa57-guide-section,
            .zpa57-guide-section:nth-child(even) {
                flex-direction: column;
            }
        }