/* Reset and base styles */
* {
    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;
    padding: 20px;
    line-height: 1.6;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px 0;
}

/* Donation card */
.donation-card {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    margin-bottom: 30px;
}

.header {
    background: linear-gradient(135deg, #ff6b6b, #ee5a24);
    color: white;
    padding: 40px 30px;
    text-align: center;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 300;
}

/* Form styles */
form {
    padding: 40px 30px;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #333;
    font-size: 0.95rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px;
    border: 2px solid #e1e5e9;
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: #f8f9fa;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
    background: white;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.help-text {
    display: block;
    margin-top: 5px;
    font-size: 0.85rem;
    color: #666;
}

/* Amount selection */
.amount-selection {
    margin-top: 10px;
}

.preset-amounts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 10px;
    margin-bottom: 20px;
}

.amount-btn {
    padding: 15px 10px;
    border: 2px solid #e1e5e9;
    background: white;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 600;
    color: #333;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.amount-btn:hover {
    border-color: #667eea;
    background: #f8f9ff;
}

.amount-btn.active {
    border-color: #667eea;
    background: #667eea;
    color: white;
}

.custom-amount {
    margin-top: 15px;
}

.custom-amount label {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 8px;
}

/* Checkbox styles */
.checkbox-label {
    display: flex;
    align-items: flex-start;
    cursor: pointer;
    font-size: 0.9rem;
    color: #555;
    line-height: 1.4;
}

.checkbox-label input[type="checkbox"] {
    width: auto;
    margin-right: 10px;
    margin-top: 2px;
    transform: scale(1.2);
}

/* Donate button */
.donate-btn {
    width: 100%;
    padding: 18px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 20px;
    position: relative;
    overflow: hidden;
}

.donate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
}

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

.donate-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.btn-loading {
    display: none;
}

/* Payment info */
.payment-info {
    background: #f8f9fa;
    padding: 20px 30px;
    border-top: 1px solid #e1e5e9;
}

.payment-info p {
    margin-bottom: 8px;
    font-size: 0.9rem;
    color: #666;
}

.payment-info p:last-child {
    margin-bottom: 0;
}

/* Footer */
.footer {
    text-align: center;
    color: white;
    opacity: 0.8;
    font-size: 0.9rem;
}

/* Responsive design */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    .container {
        padding: 10px 0;
    }
    
    .header {
        padding: 30px 20px;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    form {
        padding: 30px 20px;
    }
    
    .preset-amounts {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .payment-info {
        padding: 15px 20px;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.8rem;
    }
    
    .preset-amounts {
        grid-template-columns: 1fr;
    }
    
    .amount-btn {
        padding: 12px;
        font-size: 0.85rem;
    }
}

/* Animation for form elements */
.form-group {
    animation: slideInUp 0.6s ease-out;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Success state */
.success-message {
    background: #d4edda;
    color: #155724;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    border: 1px solid #c3e6cb;
}

/* Error state */
.error-message {
    background: #f8d7da;
    color: #721c24;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    border: 1px solid #f5c6cb;
}