/* Glassmorphism Design System for Renxuai.com */
        :root {
            /* Primary brand colors */
            --primary-500: #2563eb;
            --primary-600: #1d4ed8;
            --primary-700: #1e40af;
            --cta-500: #f97316;
            --cta-600: #ea580c;
            
            /* Glassmorphism base colors */
            --glass-bg: rgba(255, 255, 255, 0.8);
            --glass-bg-dark: rgba(255, 255, 255, 0.1);
            --glass-border: rgba(255, 255, 255, 0.2);
            --glass-border-dark: rgba(255, 255, 255, 0.1);
            
            /* Text colors */
            --text-primary: #1e293b;
            --text-secondary: #475569;
            --text-muted: #64748b;
            --text-on-primary: #ffffff;
            
            /* Background colors */
            --bg-base: #f8fafc;
            --bg-surface: #ffffff;
            
            /* Dark mode variants */
            --dark-bg-base: #0f172a;
            --dark-bg-surface: #1e293b;
            --dark-text-primary: #f1f5f9;
            --dark-text-secondary: #cbd5e1;
            --dark-text-muted: #94a3b8;
            
            /* Shadows */
            --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
            --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
            
            /* Border radius */
            --radius-sm: 0.25rem;
            --radius-md: 0.5rem;
            --radius-lg: 0.75rem;
            --radius-xl: 1rem;
            --radius-2xl: 1.5rem;
            --radius-full: 9999px;
            
            /* Spacing */
            --spacing-xs: 0.25rem;
            --spacing-sm: 0.5rem;
            --spacing-md: 1rem;
            --spacing-lg: 1.5rem;
            --spacing-xl: 2rem;
            --spacing-2xl: 3rem;
            
            /* Fonts */
            --font-sans: "Poppins", "Open Sans", "Inter", ui-sans-serif, system-ui, sans-serif;
            --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
        }

        /* Dark mode variables */
        [data-theme="dark"] {
            --glass-bg: rgba(30, 41, 59, 0.8);
            --glass-bg-dark: rgba(15, 23, 42, 0.8);
            --glass-border: rgba(255, 255, 255, 0.1);
            --glass-border-dark: rgba(255, 255, 255, 0.05);
            --text-primary: var(--dark-text-primary);
            --text-secondary: var(--dark-text-secondary);
            --text-muted: var(--dark-text-muted);
            --bg-base: var(--dark-bg-base);
            --bg-surface: var(--dark-bg-surface);
        }

        * {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            font-family: var(--font-sans);
            background: linear-gradient(135deg, var(--bg-base) 0%, #e2e8f0 100%);
            color: var(--text-primary);
            line-height: 1.6;
        }

        /* Container */
        .container {
            width: min(1200px, 92vw);
            margin: 0 auto;
        }

        /* Skip link for accessibility */
        .skip-link {
            position: absolute;
            left: -9999px;
        }

        .skip-link:focus {
            left: 12px;
            top: 10px;
            background: var(--primary-500);
            color: var(--text-on-primary);
            padding: 6px 10px;
            border-radius: var(--radius-md);
            z-index: 1000;
        }

        /* Navigation */
        .top-nav {
            position: sticky;
            top: 0;
            z-index: 100;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            background: var(--glass-bg);
            border-bottom: 1px solid var(--glass-border);
        }

        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px 0;
            gap: 12px;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 700;
            letter-spacing: 0.02em;
            color: var(--text-primary);
            text-decoration: none;
        }

        .nav-logo-dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--primary-500);
            box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.2);
        }

        .nav-links {
            display: flex;
            gap: 20px;
            font-size: 14px;
            font-weight: 500;
        }

        .nav-links a {
            color: var(--text-secondary);
            text-decoration: none;
            transition: color 0.2s ease;
        }

        .nav-links a:hover {
            color: var(--primary-500);
        }

        .nav-dropdown {
            position: relative;
            display: inline-block;
        }

        .nav-dropdown > span {
            cursor: pointer;
            color: var(--text-secondary);
            transition: color 0.2s ease;
        }

        .nav-dropdown > span:hover {
            color: var(--primary-500);
        }

        .dropdown-content {
            display: none;
            position: absolute;
            background: var(--glass-bg);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            min-width: 160px;
            box-shadow: var(--shadow-md);
            z-index: 1000;
            padding: 8px 0;
        }

        .nav-dropdown:hover .dropdown-content {
            display: block;
        }

        .dropdown-content a {
            color: var(--text-primary);
            padding: 12px 16px;
            text-decoration: none;
            display: block;
            transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease, opacity 0.2s ease;
        }

        .dropdown-content a:hover {
            background: rgba(37, 99, 235, 0.1);
            color: var(--primary-500);
        }

        /* Header */
        .page-header {
            padding: 64px 0 40px;
            text-align: center;
        }

        .hero-content {
            max-width: 800px;
            margin: 0 auto;
        }

        .page-header h1 {
            margin: 0;
            font-size: clamp(32px, 4vw, 56px);
            font-weight: 700;
            line-height: 1.1;
            letter-spacing: -0.02em;
            color: var(--text-primary);
        }

        .hero-subtitle {
            margin: 16px 0 0;
            font-size: 18px;
            line-height: 1.7;
            color: var(--text-secondary);
        }

        /* Main Content */
        .main-content {
            padding: 0 0 60px;
        }

        .intro-section,
        .roles-section,
        .cta-section {
            padding: 40px 0;
        }

        .intro-section {
            background: rgba(248, 250, 252, 0.5);
            border-top: 1px solid var(--glass-border);
            border-bottom: 1px solid var(--glass-border);
        }

        .container h2 {
            margin: 0 0 16px;
            font-size: 32px;
            font-weight: 700;
            color: var(--text-primary);
        }

        .container p {
            margin: 0 0 16px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* Roles Grid */
        .roles-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 24px;
        }

        .role-card {
            background: var(--glass-bg);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-xl);
            padding: 24px;
            box-shadow: var(--shadow-md);
            transition: color 0.3s ease, background-color 0.3s ease, border-color 0.3s ease, transform 0.3s ease, opacity 0.3s ease;
        }

        .role-card:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(37, 99, 235, 0.3);
        }

        [data-theme="dark"] .role-card {
            background: var(--glass-bg-dark);
            border: 1px solid var(--glass-border-dark);
        }

        .role-card-header h3 {
            margin: 0 0 8px;
            font-size: 24px;
            font-weight: 700;
            color: var(--text-primary);
        }

        .role-card-header p {
            margin: 0;
            color: var(--text-secondary);
            font-size: 16px;
        }

        .role-card-body p {
            margin: 0 0 16px;
            color: var(--text-secondary);
        }

        /* Scenarios List */
        .scenarios-list h4 {
            margin: 0 0 16px;
            font-size: 20px;
            font-weight: 600;
            color: var(--text-primary);
        }

        .scenario-link {
            display: block;
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 16px;
            margin-bottom: 12px;
            text-decoration: none;
            transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease, opacity 0.2s ease;
            backdrop-filter: blur(4px);
            -webkit-backdrop-filter: blur(4px);
        }

        .scenario-link:hover {
            transform: translateY(-2px);
            border-color: rgba(37, 99, 235, 0.3);
            box-shadow: var(--shadow-md);
        }

        .scenario-title {
            display: block;
            font-size: 16px;
            font-weight: 600;
            color: var(--primary-500);
            margin-bottom: 8px;
        }

        .scenario-desc {
            display: block;
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* CTA Section */
        .cta-section {
            text-align: center;
        }

        .cta-section h2 {
            margin-bottom: 24px;
        }

        .cta-button {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 24px;
            border-radius: var(--radius-full);
            border: 2px solid transparent;
            font-size: 15px;
            font-weight: 600;
            text-decoration: none;
            cursor: pointer;
            transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease, opacity 0.2s ease;
            font-family: var(--font-sans);
            background: var(--primary-500);
            color: var(--text-on-primary);
            border-color: var(--primary-500);
        }

        .cta-button:hover {
            background: var(--primary-600);
            border-color: var(--primary-600);
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }

        .cta-links {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            justify-content: center;
            margin-top: 16px;
        }

        .cta-links a {
            color: var(--text-primary);
            text-decoration: none;
            transition: color 0.2s ease;
        }

        .cta-links a:hover {
            color: var(--primary-500);
        }

        /* Footer */
        .footer {
            background: var(--glass-bg);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-top: 1px solid var(--glass-border);
            padding: 48px 0 64px;
        }

        .footer-content {
            display: flex;
            align-items: start;
            justify-content: space-between;
            gap: 40px;
            margin-bottom: 32px;
        }

        .footer-info h3 {
            margin: 0 0 12px;
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
        }

        .footer-info p {
            margin: 0;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        .footer-links {
            display: flex;
            gap: 24px;
        }

        .footer-links a {
            color: var(--text-secondary);
            font-weight: 500;
            text-decoration: none;
            transition: color 0.2s ease;
        }

        .footer-links a:hover {
            color: var(--primary-500);
        }

        .footer-copyright {
            text-align: center;
            padding-top: 32px;
            border-top: 1px solid var(--glass-border);
        }

        .footer-copyright p {
            margin: 0;
            color: var(--text-muted);
        }

        /* Responsive design */
        @media (max-width: 960px) {
            .roles-grid {
                grid-template-columns: 1fr;
            }
            
            .footer-content {
                flex-direction: column;
                align-items: center;
                text-align: center;
            }
            
            .footer-links {
                justify-content: center;
            }
        }

        @media (max-width: 640px) {
            .page-header {
                padding: 40px 0 24px;
            }
            
            .page-header h1 {
                font-size: clamp(28px, 6vw, 40px);
            }
            
            .intro-section,
            .roles-section,
            .cta-section {
                padding: 28px 0;
            }
            
            .role-card {
                padding: 20px;
                border-radius: var(--radius-lg);
            }
            
            .scenario-link {
                padding: 12px;
            }
            
            .cta-button {
                width: 100%;
                max-width: 300px;
            }
            
            .cta-links {
                flex-direction: column;
                align-items: center;
            }
        }

        /* Accessibility enhancements */
        :focus-visible {
            outline: 2px solid var(--primary-500);
            outline-offset: 2px;
        }

        /* Ensure sufficient contrast for WCAG AA compliance */
        a:not(.cta-button):not(.scenario-link) {
            color: var(--primary-500);
            text-decoration: underline;
            text-underline-offset: 2px;
        }

        a:not(.cta-button):not(.scenario-link):hover {
            color: var(--primary-600);
        }


@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}