:root {
            --primary: #6366f1;
            --primary-dark: #4f46e5;
            --primary-light: #8b5cf6;
            --secondary: #f59e0b;
            --background: #0a0a0f;
            --surface: #1a1a24;
            --surface-light: #252532;
            --text-primary: #f8fafc;
            --text-secondary: #cbd5e1;
            --text-muted: #64748b;
            --border: #334155;
            --success: #10b981;
            --error: #ef4444;
            --gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
            --gradient-subtle: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
        }

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

        html {
            scroll-behavior: smooth;
            scroll-padding-top: 80px;
        }

        body {
            font-family: 'Inter', system-ui, -apple-system, sans-serif;
            background: var(--background);
            color: var(--text-primary);
            line-height: 1.6;
            overflow-x: hidden;
        }

        /* Animated background */
        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: 
                radial-gradient(circle at 20% 80%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 40% 40%, rgba(245, 158, 11, 0.05) 0%, transparent 50%);
            z-index: -1;
            animation: backgroundFloat 20s ease-in-out infinite;
        }

        @keyframes backgroundFloat {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.8; }
        }

        .container {
            max-width: 800px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        /* Header */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background: rgba(10, 10, 15, 0.95);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border);
            z-index: 1000;
            transition: all 0.3s ease;
        }

        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 1.5rem;
            max-width: 1200px;
            margin: 0 auto;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            text-decoration: none;
            color: var(--text-primary);
            font-weight: 700;
            font-size: 1.5rem;
        }

        .logo-icon {
            width: 40px;
            height: 40px;
            background: var(--gradient);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.25rem;
            animation: logoFloat 3s ease-in-out infinite;
        }

        @keyframes logoFloat {
            0%, 100% { transform: translateY(0px) rotate(0deg); }
            50% { transform: translateY(-2px) rotate(2deg); }
        }

        .nav {
            display: flex;
            gap: 2rem;
        }

        .nav a {
            color: var(--text-secondary);
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s ease;
            position: relative;
        }

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

        .nav a::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--gradient);
            transition: width 0.3s ease;
        }

        .nav a:hover::after {
            width: 100%;
        }

        /* Main content */
        main {
            margin-top: 80px;
            padding: 3rem 0;
        }

        .section {
            margin-bottom: 4rem;
        }

        .section-title {
            font-family: 'Playfair Display', serif;
            font-size: 2.5rem;
            font-weight: 700;
            text-align: center;
            margin-bottom: 3rem;
            background: var(--gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        /* Card styles */
        .card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 20px;
            padding: 2.5rem;
            position: relative;
            overflow: hidden;
            transition: all 0.3s ease;
        }

        .card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: var(--gradient);
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 25px 50px rgba(99, 102, 241, 0.2);
        }

        /* Riddle specific styles */
        .riddle-text {
            font-family: 'Playfair Display', serif;
            font-size: 1.5rem;
            font-weight: 600;
            line-height: 1.5;
            margin-bottom: 2rem;
            color: var(--text-primary);
        }

        .hint-section {
            margin: 2rem 0;
        }

        .hint-section summary {
            cursor: pointer;
            color: var(--primary);
            font-weight: 600;
            padding: 1rem;
            background: var(--gradient-subtle);
            border-radius: 12px;
            border: 1px solid rgba(99, 102, 241, 0.2);
            transition: all 0.3s ease;
            list-style: none;
        }

        .hint-section summary:hover {
            background: rgba(99, 102, 241, 0.2);
            transform: translateX(5px);
        }

        .hint-section p {
            margin-top: 1rem;
            padding: 1.5rem;
            background: var(--surface-light);
            border-radius: 12px;
            border-left: 4px solid var(--secondary);
            animation: slideIn 0.3s ease;
        }

        @keyframes slideIn {
            from { opacity: 0; transform: translateY(-10px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* Answer input section */
        .answer-section {
            display: flex;
            gap: 1rem;
            margin-top: 2rem;
        }

        .answer-input {
            flex: 1;
            padding: 1rem 1.5rem;
            border: 2px solid var(--border);
            border-radius: 12px;
            background: var(--surface-light);
            color: var(--text-primary);
            font-size: 1rem;
            transition: all 0.3s ease;
        }

        .answer-input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
        }

        .submit-button {
            padding: 1rem 2rem;
            background: var(--gradient);
            border: none;
            border-radius: 12px;
            color: white;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            min-width: 120px;
        }

        .submit-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 25px rgba(99, 102, 241, 0.3);
        }

        .submit-button:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none;
        }

        /* Feedback messages */
        .feedback-message {
            margin-top: 1.5rem;
            padding: 1rem;
            border-radius: 12px;
            font-weight: 600;
            text-align: center;
            min-height: auto;
            transition: all 0.3s ease;
        }

        .feedback-message.correct {
            background: rgba(16, 185, 129, 0.1);
            border: 1px solid var(--success);
            color: var(--success);
        }

        .feedback-message.incorrect {
            background: rgba(239, 68, 68, 0.1);
            border: 1px solid var(--error);
            color: var(--error);
        }

        .correct-answer-display {
            margin-top: 1.5rem;
            padding: 1.5rem;
            background: rgba(16, 185, 129, 0.1);
            border: 1px solid var(--success);
            border-radius: 12px;
            display: none;
            animation: slideIn 0.3s ease;
        }

        /* Archive styles */
        .archive-item {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 16px;
            margin-bottom: 1.5rem;
            overflow: hidden;
            transition: all 0.3s ease;
        }

        .archive-item:hover {
            border-color: var(--primary);
        }

        .archive-item summary {
            padding: 1.5rem 2rem;
            background: var(--gradient-subtle);
            cursor: pointer;
            font-weight: 600;
            font-size: 1.1rem;
            color: var(--text-primary);
            transition: all 0.3s ease;
            list-style: none;
        }

        .archive-item summary:hover {
            background: rgba(99, 102, 241, 0.2);
        }

        .archive-item[open] summary {
            border-bottom: 1px solid var(--border);
        }

        .archive-item .riddle-content {
            padding: 2rem;
        }

        /* Contact section */
        .contact-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 1.5rem;
            margin: 2rem 0;
        }

        .contact-card {
            background: var(--surface);
            padding: 2rem;
            border-radius: 16px;
            border: 1px solid var(--border);
            text-align: center;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .contact-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: var(--gradient);
        }

        .contact-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 20px 40px rgba(99, 102, 241, 0.15);
        }

        .contact-card h4 {
            font-size: 1.25rem;
            margin-bottom: 1rem;
            color: var(--text-primary);
        }

        .contact-card a {
            color: var(--primary);
            text-decoration: none;
            font-weight: 500;
        }

        .contact-card a:hover {
            color: var(--primary-light);
        }

        .contact-card .note {
            color: var(--text-muted);
            font-size: 0.875rem;
            margin-top: 0.5rem;
        }

        .section-intro {
            text-align: center;
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto 2rem;
        }

        .contact-brag {
            text-align: center;
            font-style: italic;
            color: var(--text-muted);
            margin-top: 2rem;
        }

        /* Footer */
        footer {
            background: var(--surface);
            border-top: 1px solid var(--border);
            padding: 3rem 0;
            text-align: center;
            margin-top: 4rem;
        }

        .footer-content {
            color: var(--text-secondary);
        }

        .tagline {
            color: var(--text-muted);
            font-style: italic;
            margin-top: 0.5rem;
        }

        /* Responsive design */
        @media (max-width: 768px) {
            .header-content {
                padding: 1rem;
            }

            .nav {
                gap: 1rem;
            }

            .section-title {
                font-size: 2rem;
            }

            .card {
                padding: 1.5rem;
            }

            .riddle-text {
                font-size: 1.25rem;
            }

            .answer-section {
                flex-direction: column;
            }

            .contact-grid {
                grid-template-columns: 1fr;
            }
        }

        /* Loading animation */
        .loading {
            display: inline-block;
            width: 20px;
            height: 20px;
            border: 2px solid var(--border);
            border-radius: 50%;
            border-top: 2px solid var(--primary);
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }