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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
}

header {
    text-align: center;
    color: white;
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

.card {
    background: white;
    border-radius: 12px;
    padding: 30px;
    margin-bottom: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.card h2 {
    color: #333;
    margin-bottom: 20px;
    font-size: 1.5rem;
    border-bottom: 2px solid #667eea;
    padding-bottom: 10px;
}

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

.form-group label {
    display: block;
    color: #333;
    font-weight: 600;
    margin-bottom: 8px;
    font-size: 1rem;
}

.form-group input[type="text"],
.form-group input[type="url"] {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input[type="text"]:focus,
.form-group input[type="url"]:focus {
    outline: none;
    border-color: #667eea;
}

.form-group input[type="text"]:read-only,
.form-group input[type="url"]:read-only {
    background-color: #f8f9fa;
    cursor: not-allowed;
    color: #666;
}

.form-group small {
    display: block;
    color: #666;
    margin-top: 5px;
    font-size: 0.85rem;
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    padding: 15px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
}

.checkbox-label:hover {
    border-color: #667eea;
    background-color: #f8f9ff;
}

.checkbox-label input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.checkbox-custom {
    width: 24px;
    height: 24px;
    border: 2px solid #667eea;
    border-radius: 6px;
    margin-right: 15px;
    position: relative;
    flex-shrink: 0;
    transition: all 0.3s;
}

.checkbox-label input[type="checkbox"]:checked ~ .checkbox-custom {
    background-color: #667eea;
}

.checkbox-label input[type="checkbox"]:checked ~ .checkbox-custom::after {
    content: '✓';
    position: absolute;
    color: white;
    font-size: 16px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.checkbox-info {
    flex: 1;
}

.checkbox-info strong {
    display: block;
    color: #333;
    margin-bottom: 3px;
}

.checkbox-info small {
    color: #666;
    font-size: 0.85rem;
}

.button-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background-color: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background-color: #5a6268;
    transform: translateY(-2px);
}

.btn-danger {
    background-color: #dc3545;
    color: white;
}

.btn-danger:hover {
    background-color: #c82333;
    transform: translateY(-2px);
}

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

.subscriptions-list {
    min-height: 100px;
}

.subscription-item {
    padding: 15px;
    background-color: #f8f9fa;
    border-radius: 8px;
    margin-bottom: 10px;
    border-left: 4px solid #667eea;
}

.subscription-item strong {
    display: block;
    color: #333;
    margin-bottom: 8px;
}

.subscription-types {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.type-badge {
    background-color: #667eea;
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

.loading {
    text-align: center;
    color: #666;
    padding: 20px;
}

.empty-state {
    text-align: center;
    color: #666;
    padding: 30px;
}

.empty-state::before {
    content: '📭';
    display: block;
    font-size: 3rem;
    margin-bottom: 10px;
}

.message-box {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 15px 20px;
    border-radius: 8px;
    color: white;
    font-weight: 500;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    z-index: 1000;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.message-box.success {
    background-color: #28a745;
}

.message-box.error {
    background-color: #dc3545;
}

.message-box.info {
    background-color: #17a2b8;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    .card {
        padding: 20px;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}