:root {
            --zfrc1y-primary: #6366F1;
            --zfrc1y-primary-dark: #4F46E5;
            --zfrc1y-secondary: #f43f5e;
            --zfrc1y-bg: #f8fafc;
            --zfrc1y-text: #1e293b;
            --zfrc1y-text-light: #64748b;
            --zfrc1y-white: #ffffff;
            --zfrc1y-code-bg: #111827;
            --zfrc1y-border: #e2e8f0;
            --zfrc1y-container-width: 1180px;
        }

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

        body {
            font-family: "Inter", "Microsoft YaHei", sans-serif;
            background-color: var(--zfrc1y-bg);
            color: var(--zfrc1y-text);
            line-height: 1.7;
            overflow-x: hidden;
        }

        /* Layout Utilities */
        .zfrc1y-container {
            max-width: var(--zfrc1y-container-width);
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        .zfrc1y-flex {
            display: flex;
            flex-wrap: wrap;
        }

        .zfrc1y-grid {
            display: grid;
            gap: 32px;
        }

        /* Navigation */
        .zfrc1y-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--zfrc1y-border);
            padding: 12px 0;
        }

        .zfrc1y-nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

        .zfrc1y-logo {
            min-width: 0;
        }

        .zfrc1y-logo img {
            height: 42px;
            display: block;
        }

        .zfrc1y-menu {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .zfrc1y-menu li a {
            text-decoration: none;
            color: var(--zfrc1y-text);
            font-size: 15px;
            font-weight: 500;
            padding: 8px 16px;
            border-radius: 8px;
            transition: all 0.3s ease;
            word-break: keep-all;
        }

        .zfrc1y-menu li a:hover {
            background: rgba(99, 102, 241, 0.1);
            color: var(--zfrc1y-primary);
        }

        .zfrc1y-menu li a.zfrc1y-active {
            background: var(--zfrc1y-primary);
            color: var(--zfrc1y-white);
        }

        /* Hero Section - Unique Card Style */
        .zfrc1y-hero {
            padding: 80px 0;
            background: radial-gradient(circle at top right, #e0e7ff 0%, transparent 40%),
                        radial-gradient(circle at bottom left, #fef2f2 0%, transparent 40%);
        }

        .zfrc1y-hero-card {
            background: var(--zfrc1y-white);
            border-radius: 24px;
            box-shadow: 0 20px 50px rgba(0,0,0,0.05);
            padding: 64px;
            text-align: center;
            border: 1px solid var(--zfrc1y-white);
            max-width: 960px;
            margin: 0 auto;
        }

        .zfrc1y-hero-title {
            font-size: clamp(2rem, 4vw + 1rem, 3.5rem);
            line-height: 1.2;
            margin-bottom: 24px;
            background: linear-gradient(135deg, #1e293b 0%, #6366f1 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            font-weight: 800;
            word-break: keep-all;
        }

        .zfrc1y-hero-subtitle {
            font-size: clamp(1rem, 1.5vw + 0.5rem, 1.25rem);
            color: var(--zfrc1y-text-light);
            max-width: 700px;
            margin: 0 auto 40px;
        }

        /* Content Sections */
        .zfrc1y-section {
            padding: 96px 0;
        }

        .zfrc1y-section-title {
            font-size: 32px;
            font-weight: 700;
            margin-bottom: 48px;
            text-align: center;
            position: relative;
        }

        .zfrc1y-section-title::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background: var(--zfrc1y-primary);
            margin: 16px auto 0;
            border-radius: 2px;
        }

        /* Step-by-Step Merge Guide */
        .zfrc1y-merge-steps {
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
        }

        .zfrc1y-step-card {
            background: var(--zfrc1y-white);
            padding: 40px;
            border-radius: 16px;
            border: 1px solid var(--zfrc1y-border);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .zfrc1y-step-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 30px rgba(0,0,0,0.08);
        }

        .zfrc1y-step-number {
            font-size: 64px;
            font-weight: 900;
            color: rgba(99, 102, 241, 0.05);
            position: absolute;
            top: -10px;
            right: 10px;
            line-height: 1;
        }

        .zfrc1y-step-card h3 {
            font-size: 22px;
            margin-bottom: 16px;
            color: var(--zfrc1y-primary);
        }

        /* Visual Diff Section */
        .zfrc1y-diff-preview {
            display: flex;
            background: var(--zfrc1y-code-bg);
            border-radius: 12px;
            padding: 20px;
            color: #d1d5db;
            font-family: 'Consolas', monospace;
            font-size: 14px;
            overflow: hidden;
            margin-top: 32px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
        }

        .zfrc1y-diff-col {
            flex: 1;
            min-width: 0;
            padding: 0 15px;
        }

        .zfrc1y-diff-col:first-child {
            border-right: 1px solid #374151;
        }

        .zfrc1y-diff-line {
            white-space: pre;
            padding: 2px 4px;
        }

        .zfrc1y-diff-del { background: rgba(244, 63, 94, 0.2); border-left: 3px solid #f43f5e; }
        .zfrc1y-diff-add { background: rgba(16, 185, 129, 0.2); border-left: 3px solid #10b981; }

        /* Solutions Grid */
        .zfrc1y-solutions {
            background: #1e293b;
            color: var(--zfrc1y-white);
            padding: 96px 0;
        }

        .zfrc1y-solution-card {
            background: rgba(255, 255, 255, 0.05);
            padding: 32px;
            border-radius: 16px;
            border: 1px solid rgba(255, 255, 255, 0.1);
            min-width: 0;
            flex: 1 1 300px;
            margin: 10px;
        }

        .zfrc1y-solution-tag {
            display: inline-block;
            background: var(--zfrc1y-primary);
            color: white;
            font-size: 12px;
            padding: 4px 12px;
            border-radius: 20px;
            margin-bottom: 16px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .zfrc1y-solution-card h4 {
            font-size: 20px;
            margin-bottom: 12px;
        }

        .zfrc1y-solution-card p {
            color: #94a3b8;
            font-size: 15px;
        }

        /* Call to Action */
        .zfrc1y-cta {
            text-align: center;
            background: linear-gradient(135deg, var(--zfrc1y-primary) 0%, var(--zfrc1y-primary-dark) 100%);
            color: white;
            padding: 80px 24px;
            border-radius: 0;
        }

        .zfrc1y-btn {
            display: inline-block;
            padding: 16px 40px;
            background: var(--zfrc1y-white);
            color: var(--zfrc1y-primary);
            text-decoration: none;
            font-weight: 700;
            border-radius: 50px;
            font-size: 18px;
            transition: all 0.3s ease;
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
            margin-top: 32px;
        }

        .zfrc1y-btn:hover {
            transform: scale(1.05);
            box-shadow: 0 15px 30px rgba(0,0,0,0.2);
        }

        /* Footer */
        .zfrc1y-footer {
            background: var(--zfrc1y-white);
            border-top: 1px solid var(--zfrc1y-border);
            padding: 64px 0 32px;
        }

        .zfrc1y-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            margin-bottom: 48px;
        }

        .zfrc1y-footer-brand {
            font-size: 24px;
            font-weight: 800;
            color: var(--zfrc1y-primary);
            margin-bottom: 16px;
        }

        .zfrc1y-footer-links h5 {
            margin-bottom: 20px;
            font-size: 16px;
            color: var(--zfrc1y-text);
        }

        .zfrc1y-footer-links ul {
            list-style: none;
        }

        .zfrc1y-footer-links li {
            margin-bottom: 10px;
        }

        .zfrc1y-footer-links a {
            color: var(--zfrc1y-text-light);
            text-decoration: none;
            transition: color 0.3s;
        }

        .zfrc1y-footer-links a:hover {
            color: var(--zfrc1y-primary);
        }

        .zfrc1y-copyright {
            text-align: center;
            padding-top: 32px;
            border-top: 1px solid var(--zfrc1y-border);
            color: var(--zfrc1y-text-light);
            font-size: 14px;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .zfrc1y-menu {
                display: none; /* In a real site, implement a hamburger menu */
            }
            .zfrc1y-hero-card {
                padding: 40px 20px;
            }
            .zfrc1y-section {
                padding: 64px 0;
            }
        }