:root {
            --zpa57-primary: #0047AB;
            --zpa57-secondary: #00C2FF;
            --zpa57-accent: #FF6B00;
            --zpa57-dark: #1A1C20;
            --zpa57-light: #F8FAFC;
            --zpa57-gray: #64748B;
            --zpa57-success: #10B981;
            --zpa57-error: #EF4444;
            --zpa57-spacing: 8px;
            --zpa57-container-width: 1300px;
        }

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

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--zpa57-light);
            color: var(--zpa57-dark);
            line-height: 1.6;
            overflow-x: hidden;
        }

        /* Layout Helpers */
        .zpa57-flex { display: flex; flex-wrap: wrap; }
        .zpa57-grid { display: grid; }
        .zpa57-container { 
            max-width: var(--zpa57-container-width); 
            margin: 0 auto; 
            padding: 0 calc(var(--zpa57-spacing) * 3);
        }

        /* Typography */
        h1, h2, h3 { 
            word-break: keep-all; 
            overflow-wrap: break-word; 
            line-height: 1.2;
            color: var(--zpa57-dark);
        }
        p { 
            word-break: break-word; 
            overflow-wrap: break-word; 
            line-height: 1.8;
            margin-bottom: calc(var(--zpa57-spacing) * 2);
        }

        /* Navigation */
        .zpa57-nav-wrapper {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
        }

        .zpa57-nav-inner {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            height: 80px;
        }

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

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

        .zpa57-menu {
            display: flex;
            flex-wrap: wrap;
            gap: calc(var(--zpa57-spacing) * 3);
            list-style: none;
        }

        .zpa57-menu a {
            text-decoration: none;
            color: var(--zpa57-gray);
            font-weight: 500;
            font-size: clamp(0.9rem, 1vw + 0.2rem, 1rem);
            transition: color 0.3s ease;
            position: relative;
        }

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

        .zpa57-menu a.active::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--zpa57-primary);
        }

        /* Hero Troubleshooting Section */
        .zpa57-hero-diag {
            padding-top: 160px;
            padding-bottom: 96px;
            background: radial-gradient(circle at 90% 10%, #E3F2FD 0%, #FFFFFF 60%);
            position: relative;
            overflow: hidden;
        }

        .zpa57-hero-diag::before {
            content: "ERROR_LOG";
            position: absolute;
            font-family: monospace;
            font-size: 20rem;
            color: rgba(0, 0, 0, 0.02);
            top: -50px;
            right: -100px;
            z-index: 0;
        }

        .zpa57-hero-content {
            position: relative;
            z-index: 1;
            max-width: 800px;
        }

        .zpa57-badge {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(0, 71, 171, 0.1);
            color: var(--zpa57-primary);
            border-radius: 20px;
            font-weight: 600;
            font-size: 0.85rem;
            margin-bottom: 24px;
        }

        .zpa57-hero-title {
            font-size: clamp(2rem, 5vw + 1rem, 4rem);
            font-weight: 800;
            margin-bottom: 24px;
            background: linear-gradient(135deg, var(--zpa57-primary), var(--zpa57-secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .zpa57-search-bar {
            background: #FFFFFF;
            padding: 8px;
            border-radius: 16px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.08);
            display: flex;
            flex-wrap: wrap;
            margin-top: 48px;
            border: 1px solid rgba(0,0,0,0.05);
        }

        .zpa57-search-bar input {
            flex: 1;
            min-width: 200px;
            border: none;
            padding: 16px 24px;
            font-size: 1.1rem;
            outline: none;
        }

        .zpa57-search-btn {
            background: var(--zpa57-primary);
            color: white;
            border: none;
            padding: 16px 32px;
            border-radius: 12px;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.2s;
        }

        .zpa57-search-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 71, 171, 0.3);
        }

        /* Diagnostic Categories Grid */
        .zpa57-diag-grid {
            padding: 96px 0;
            background-color: white;
        }

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

        .zpa57-section-head h2 {
            font-size: clamp(1.5rem, 3vw + 0.5rem, 2.5rem);
            margin-bottom: 16px;
        }

        .zpa57-cards-wrapper {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
        }

        .zpa57-diag-card {
            background: var(--zpa57-light);
            padding: 40px;
            border-radius: 24px;
            border: 1px solid transparent;
            transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
            min-width: 0;
        }

        .zpa57-diag-card:hover {
            background: white;
            border-color: var(--zpa57-primary);
            box-shadow: 0 30px 60px rgba(0, 71, 171, 0.1);
            transform: translateY(-10px);
        }

        .zpa57-card-icon {
            width: 56px;
            height: 56px;
            background: white;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 24px;
            box-shadow: 0 10px 20px rgba(0,0,0,0.05);
            font-size: 1.5rem;
        }

        .zpa57-card-title {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 16px;
        }

        /* Troubleshooting Steps - Side by Side */
        .zpa57-solutions-section {
            padding: 96px 0;
            background: #F1F5F9;
        }

        .zpa57-split-layout {
            display: flex;
            flex-wrap: wrap;
            gap: 64px;
            align-items: flex-start;
        }

        .zpa57-split-text {
            flex: 1;
            min-width: 350px;
        }

        .zpa57-split-visual {
            flex: 1;
            min-width: 350px;
            background: var(--zpa57-dark);
            border-radius: 16px;
            padding: 24px;
            box-shadow: 0 40px 80px rgba(0,0,0,0.2);
            color: #A5F3FC;
            font-family: 'Consolas', monospace;
            position: relative;
        }

        .zpa57-terminal-header {
            display: flex;
            gap: 8px;
            margin-bottom: 20px;
        }

        .zpa57-dot { width: 12px; height: 12px; border-radius: 50%; }
        .zpa57-dot.red { background: #FF5F56; }
        .zpa57-dot.yellow { background: #FFBD2E; }
        .zpa57-dot.green { background: #27C93F; }

        .zpa57-terminal-body {
            font-size: 0.9rem;
            line-height: 1.5;
        }

        .zpa57-terminal-line { margin-bottom: 8px; }
        .zpa57-cmd { color: #FFF; font-weight: bold; }
        .zpa57-error-text { color: #F87171; }

        .zpa57-step-item {
            display: flex;
            gap: 20px;
            margin-bottom: 32px;
        }

        .zpa57-step-num {
            flex-shrink: 0;
            width: 36px;
            height: 36px;
            background: var(--zpa57-primary);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
        }

        /* FAQ/Articles Dynamic Section */
        .zpa57-articles {
            padding: 96px 0;
        }

        .zpa57-article-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .zpa57-article-item {
            background: white;
            padding: 24px 32px;
            border-radius: 12px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            text-decoration: none;
            color: inherit;
            border: 1px solid rgba(0,0,0,0.05);
            transition: all 0.3s;
        }

        .zpa57-article-item:hover {
            border-color: var(--zpa57-secondary);
            transform: translateX(10px);
            background: #F0F9FF;
        }

        .zpa57-article-title { font-weight: 600; font-size: 1.1rem; }
        .zpa57-article-tag { color: var(--zpa57-gray); font-size: 0.85rem; }

        /* Footer */
        .zpa57-footer {
            background: var(--zpa57-dark);
            color: #CBD5E1;
            padding: 80px 0 40px;
        }

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

        .zpa57-footer-brand h2 {
            color: white;
            font-size: 1.5rem;
            margin-bottom: 16px;
        }

        .zpa57-footer-links h4 {
            color: white;
            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: #94A3B8;
            text-decoration: none;
            transition: color 0.3s;
        }

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

        .zpa57-copyright {
            padding-top: 40px;
            border-top: 1px solid rgba(255,255,255,0.1);
            text-align: center;
            font-size: 0.9rem;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .zpa57-nav-inner { height: auto; padding: 16px 0; }
            .zpa57-menu { display: none; width: 100%; flex-direction: column; gap: 12px; padding-top: 16px; }
            .zpa57-hero-diag { padding-top: 120px; }
            .zpa57-split-visual { display: none; }
        }