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

        :root {
            --bg-primary: #0a0a0a;
            --bg-secondary: #1a1a1a;
            --bg-tertiary: #2d2d2d;
            --text-primary: #ffffff;
            --text-secondary: #e0e0e0;
            --text-muted: #a0a0a0;
            --accent-primary: #00d9ff;
            --accent-secondary: #7c3aed;
            --accent-success: #10b981;
            --accent-error: #ef4444;
            --accent-warning: #f59e0b;
            --border-color: #3a3a3a;
            --code-bg: #161616;
        }

        body {
            font-family: 'Segoe UI', 'Inter', 'Roboto', -apple-system, BlinkMacSystemFont, sans-serif;
            background: linear-gradient(135deg, var(--bg-primary) 0%, #1a1a2e 100%);
            color: var(--text-secondary);
            line-height: 1.6;
            min-height: 100vh;
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Header */
        header {
            background: rgba(26, 26, 26, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-color);
            padding: 20px 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
        }

        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }

        h1 {
            color: var(--text-primary);
            font-size: 1.8rem;
            font-weight: 700;
            letter-spacing: -0.5px;
        }

        .header-badge {
            background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text-primary);
            box-shadow: 0 4px 15px rgba(0, 217, 255, 0.3);
        }

        /* Navigation */
        nav {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }

        nav button {
            background: var(--bg-tertiary);
            color: var(--text-secondary);
            border: 1px solid var(--border-color);
            padding: 10px 20px;
            border-radius: 8px;
            cursor: pointer;
            font-size: 0.95rem;
            font-weight: 500;
            transition: all 0.3s ease;
        }

        nav button:hover {
            background: var(--accent-primary);
            color: var(--bg-primary);
            border-color: var(--accent-primary);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0, 217, 255, 0.4);
        }

        nav button.active {
            background: var(--accent-secondary);
            color: var(--text-primary);
            border-color: var(--accent-secondary);
        }

        /* Sections */
        section {
            display: none;
            padding: 40px 0;
            animation: fadeIn 0.5s ease;
        }

        section.active {
            display: block;
        }

        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .hero {
            text-align: center;
            padding: 60px 20px;
            background: var(--bg-secondary);
            border-radius: 16px;
            margin-bottom: 40px;
            border: 1px solid var(--border-color);
        }

        .hero h2 {
            font-size: 2.5rem;
            color: var(--text-primary);
            margin-bottom: 20px;
            background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero p {
            font-size: 1.2rem;
            color: var(--text-muted);
            max-width: 800px;
            margin: 0 auto 30px;
        }

        .key-display {
            background: var(--code-bg);
            border: 2px solid var(--accent-primary);
            border-radius: 12px;
            padding: 20px;
            margin: 30px auto;
            max-width: 700px;
            font-family: 'Courier New', monospace;
            word-break: break-all;
        }

        .key-display .label {
            color: var(--accent-primary);
            font-size: 0.9rem;
            margin-bottom: 10px;
            font-weight: 600;
        }

        .key-display .value {
            color: var(--text-primary);
            font-size: 1.1rem;
            letter-spacing: 1px;
        }

        /* Cards */
        .card {
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 30px;
            margin-bottom: 30px;
            transition: all 0.3s ease;
        }

        .card:hover {
            border-color: var(--accent-primary);
            box-shadow: 0 8px 30px rgba(0, 217, 255, 0.2);
            transform: translateY(-2px);
        }

        .card h3 {
            color: var(--text-primary);
            font-size: 1.5rem;
            margin-bottom: 15px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .card-icon {
            width: 30px;
            height: 30px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--accent-secondary);
            border-radius: 8px;
            font-size: 1.2rem;
        }

        /* Form Elements */
        .form-group {
            margin-bottom: 25px;
        }

        label {
            display: block;
            color: var(--text-primary);
            font-weight: 600;
            margin-bottom: 8px;
            font-size: 0.95rem;
        }

        input, select, textarea {
            width: 100%;
            background: var(--bg-tertiary);
            border: 1px solid var(--border-color);
            color: var(--text-primary);
            padding: 12px 16px;
            border-radius: 8px;
            font-size: 0.95rem;
            font-family: inherit;
            transition: all 0.3s ease;
        }

        input:focus, select:focus, textarea:focus {
            outline: none;
            border-color: var(--accent-primary);
            box-shadow: 0 0 0 3px rgba(0, 217, 255, 0.1);
        }

        textarea {
            resize: vertical;
            min-height: 100px;
            font-family: 'Courier New', monospace;
        }

        /* Buttons */
        .btn {
            background: var(--accent-secondary);
            color: var(--text-primary);
            border: none;
            padding: 14px 28px;
            border-radius: 8px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .btn:hover {
            background: var(--accent-primary);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(0, 217, 255, 0.4);
        }

        .btn:active {
            transform: translateY(0);
        }

        .btn-secondary {
            background: var(--bg-tertiary);
            border: 1px solid var(--border-color);
        }

        .btn-secondary:hover {
            background: var(--accent-secondary);
            border-color: var(--accent-secondary);
        }

        /* Response Panel */
        .response-panel {
            background: var(--code-bg);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 20px;
            margin-top: 30px;
            display: none;
        }

        .response-panel.show {
            display: block;
            animation: slideIn 0.4s ease;
        }

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

        .response-section {
            margin-bottom: 20px;
        }

        .response-section:last-child {
            margin-bottom: 0;
        }

        .response-section h4 {
            color: var(--accent-primary);
            font-size: 1rem;
            margin-bottom: 10px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .status-badge {
            display: inline-block;
            padding: 6px 12px;
            border-radius: 6px;
            font-weight: 600;
            font-size: 0.9rem;
        }

        .status-success {
            background: rgba(16, 185, 129, 0.2);
            color: var(--accent-success);
            border: 1px solid var(--accent-success);
        }

        .status-error {
            background: rgba(239, 68, 68, 0.2);
            color: var(--accent-error);
            border: 1px solid var(--accent-error);
        }

        pre {
            background: var(--bg-primary);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 15px;
            overflow-x: auto;
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.5;
        }

        code {
            font-family: 'Courier New', 'Consolas', monospace;
            color: var(--accent-primary);
        }

        /* Grid Layout */
        .grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin-bottom: 40px;
        }

        /* Alert */
        .alert {
            padding: 15px 20px;
            border-radius: 8px;
            margin-bottom: 20px;
            border-left: 4px solid;
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .alert-info {
            background: rgba(0, 217, 255, 0.1);
            border-color: var(--accent-primary);
            color: var(--accent-primary);
        }

        .alert-warning {
            background: rgba(245, 158, 11, 0.1);
            border-color: var(--accent-warning);
            color: var(--accent-warning);
        }

        /* Loading Spinner */
        .spinner {
            display: inline-block;
            width: 16px;
            height: 16px;
            border: 2px solid rgba(255, 255, 255, 0.3);
            border-top-color: var(--text-primary);
            border-radius: 50%;
            animation: spin 0.6s linear infinite;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        /* Documentation */
        .doc-section {
            margin-bottom: 40px;
        }

        .doc-section h3 {
            color: var(--text-primary);
            font-size: 1.8rem;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--accent-secondary);
        }

        .example-block {
            background: var(--bg-secondary);
            border-left: 4px solid var(--accent-secondary);
            border-radius: 8px;
            padding: 20px;
            margin: 20px 0;
        }

        .example-title {
            color: var(--accent-primary);
            font-weight: 600;
            margin-bottom: 10px;
            font-size: 1.1rem;
        }

        /* Responsive */
        @media (max-width: 768px) {
            h1 {
                font-size: 1.4rem;
            }

            .hero h2 {
                font-size: 1.8rem;
            }

            .hero p {
                font-size: 1rem;
            }

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

            nav {
                width: 100%;
            }

            nav button {
                flex: 1;
                min-width: 120px;
            }
        }

        /* Highlight effect */
        .highlight {
            background: linear-gradient(135deg, rgba(0, 217, 255, 0.2), rgba(124, 58, 237, 0.2));
            padding: 2px 6px;
            border-radius: 4px;
        }

        /* Footer */
        footer {
            text-align: center;
            padding: 40px 20px;
            color: var(--text-muted);
            font-size: 0.9rem;
            border-top: 1px solid var(--border-color);
            margin-top: 60px;
        }