:root {
            --primary: #4361ee;
            --secondary: #3f37c9;
            --success: #4cc9f0;
            --dark: #1d3557;
            --light: #f8f9fa;
        }
        
        body {
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            min-height: 100vh;
            padding-top: 20px;
            padding-bottom: 50px;
        }
        
        .card {
            border-radius: 15px;
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
            transition: transform 0.3s, box-shadow 0.3s;
            margin-bottom: 25px;
            overflow: hidden;
        }
        
        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        
        .card-header {
            background: var(--primary);
            color: white;
            font-weight: bold;
            padding: 15px 20px;
        }
        
        .navbar {
            border-radius: 10px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.1);
            margin-bottom: 30px;
        }
        
        .btn-primary {
            background: var(--primary);
            border: none;
        }
        
        .btn-primary:hover {
            background: var(--secondary);
        }
        
        .btn-danger {
            background: #e63946;
            border: none;
        }
        
        .api-test {
            background: white;
            border-radius: 10px;
            padding: 20px;
            margin-top: 30px;
        }
        
        .key-item {
            background: var(--light);
            border-radius: 8px;
            padding: 12px 15px;
            margin-bottom: 10px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .status-badge {
            padding: 5px 10px;
            border-radius: 20px;
            font-size: 0.8rem;
        }
        
        .status-active {
            background: #d4edda;
            color: #155724;
        }
        
        .status-expired {
            background: #f8d7da;
            color: #721c24;
        }
        
        .usage-bar {
            height: 8px;
            background: #e9ecef;
            border-radius: 4px;
            overflow: hidden;
            margin-top: 5px;
        }
        
        .usage-fill {
            height: 100%;
            background: var(--success);
            border-radius: 4px;
        }
        
        .hero {
            background: linear-gradient(to right, var(--primary), var(--secondary));
            color: white;
            padding: 40px 20px;
            border-radius: 15px;
            margin-bottom: 30px;
            text-align: center;
        }
        
        .feature-icon {
            font-size: 2.5rem;
            color: var(--primary);
            margin-bottom: 15px;
        }
        
        .blink {
            animation: blinker 1.5s linear infinite;
        }
        
        @keyframes blinker {
            50% { opacity: 0.6; }
        }