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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    width: 100%;
    max-width: 600px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    padding: 2rem;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.main-content {
    padding: 3rem 2rem;
}

.coupon-section {
    text-align: center;
}

.textbox-container {
    margin-bottom: 2rem;
}

#couponDisplay {
    width: 100%;
    max-width: 400px;
    padding: 1.5rem;
    font-size: 1.5rem;
    font-weight: bold;
    text-align: center;
    border: 3px solid #e0e0e0;
    border-radius: 15px;
    background: #f8f9fa;
    color: #333;
    transition: all 0.3s ease;
    letter-spacing: 2px;
}

#couponDisplay:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.button-container {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    min-width: 120px;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.btn-secondary {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(245, 87, 108, 0.4);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(245, 87, 108, 0.6);
}

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

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

footer {
    text-align: center;
    padding: 1.5rem;
    background: #f8f9fa;
    color: #666;
    font-size: 0.9rem;
}

/* Animation for spinning effect */
@keyframes spin {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.spinning {
    animation: spin 0.5s ease-in-out;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        margin: 1rem;
        border-radius: 15px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .main-content {
        padding: 2rem 1rem;
    }
    
    #couponDisplay {
        font-size: 1.2rem;
        padding: 1rem;
    }
    
    .btn {
        padding: 0.8rem 1.5rem;
        font-size: 1rem;
    }
}