/* Modern Donation Page 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;
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    max-width: 500px;
    width: 100%;
    background: #ffffff;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
}

.container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
}

h2 {
    text-align: center;
    margin-bottom: 10px;
    color: #333;
    font-size: 22px;
    font-weight: 600;
}

/* Tab-style donation types */
.donation-tabs {
    display: flex;
    margin-bottom: 20px;
    background: #f8f9fa;
    border-radius: 12px;
    padding: 4px;
    position: relative;
}

.tab-button {
    flex: 1;
    padding: 12px 20px;
    background: transparent;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    color: #666;
    transition: all 0.3s ease;
    position: relative;
    z-index: 2;
}

.tab-button.active {
    color: #fff;
    background: linear-gradient(135deg, #667eea, #764ba2);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.tab-button:hover:not(.active) {
    color: #333;
    background: rgba(102, 126, 234, 0.1);
}

/* Amount section */
.amount-section {
    margin-bottom: 10px;
}

.amount-label {
    display: block;
    margin-bottom: 15px;
    font-weight: 600;
    color: #333;
    font-size: 16px;
}

.predefined-amounts {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}

.amount-btn {
    padding: 12px 16px;
    border: 2px solid #e9ecef;
    background: #fff;
    border-radius: 10px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    color: #666;
    transition: all 0.3s ease;
    text-align: center;
}

.amount-btn:hover {
    border-color: #667eea;
    color: #667eea;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.2);
}

.amount-btn.selected {
    border-color: #667eea;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #fff;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.custom-amount-wrapper {
    position: relative;
}

.custom-amount-input {
    width: 100%;
    padding: 15px 20px;
    border: 2px solid #e9ecef;
    border-radius: 12px;
    font-size: 16px;
    color: #333;
    background: #fff;
    transition: all 0.3s ease;
    outline: none;
}

.custom-amount-input:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.currency-label {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: #666;
    font-weight: 500;
    pointer-events: none;
}

/* Submit button */
.submit-btn {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 20px;
    position: relative;
    overflow: hidden;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

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

.submit-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.submit-btn:hover::before {
    left: 100%;
}

/* Message styles */
.message {
    margin-bottom: 25px;
    padding: 16px 20px;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
    animation: slideIn 0.5s ease-out;
}

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

.message.success {
    background: linear-gradient(135deg, #d4edda, #c3e6cb);
    color: #155724;
    border: 1px solid #c3e6cb;
    box-shadow: 0 4px 12px rgba(21, 87, 36, 0.1);
}

.message.error {
    background: linear-gradient(135deg, #f8d7da, #f5c6cb);
    color: #721c24;
    border: 1px solid #f5c6cb;
    box-shadow: 0 4px 12px rgba(114, 28, 36, 0.1);
}

.message.cancel {
    background: linear-gradient(135deg, #fff3cd, #ffeaa7);
    color: #856404;
    border: 1px solid #ffeaa7;
    box-shadow: 0 4px 12px rgba(133, 100, 4, 0.1);
}

.message-icon {
    font-size: 20px;
    flex-shrink: 0;
}

/* Hidden elements */
.hidden {
    display: none !important;
}

/* Responsive design */
@media (max-width: 480px) {
    .container {
        margin: 10px;
        padding: 30px 20px;
    }
    
    .predefined-amounts {
        grid-template-columns: 1fr;
    }
    
    h2 {
        font-size: 24px;
    }
    
    .tab-button {
        padding: 10px 16px;
        font-size: 14px;
    }
}

/* Loading state */
.loading {
    opacity: 0.7;
    pointer-events: none;
}

.submit-btn.loading {
    background: #ccc;
}

.submit-btn.loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border: 2px solid #fff;
    border-top: 2px solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}