/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

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

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

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

/* Card styles */
.card {
    background: white;
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
    border: 1px solid rgba(255,255,255,0.2);
}

.card h2 {
    color: #2c3e50;
    margin-bottom: 20px;
    font-size: 1.5rem;
    border-bottom: 2px solid #3498db;
    padding-bottom: 10px;
}

.card h3 {
    color: #34495e;
    margin-bottom: 15px;
    font-size: 1.2rem;
}

/* Form styles */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.form-group label {
    font-weight: 600;
    color: #2c3e50;
}

.form-group input {
    padding: 12px;
    border: 2px solid #e1e8ed;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-group small {
    color: #7f8c8d;
    font-size: 0.85rem;
}

/* Button styles */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: #3498db;
    color: white;
}

.btn-primary:hover {
    background: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
}

.btn-secondary {
    background: #95a5a6;
    color: white;
}

.btn-secondary:hover:not(:disabled) {
    background: #7f8c8d;
    transform: translateY(-2px);
}

.btn-success {
    background: #27ae60;
    color: white;
}

.btn-success:hover:not(:disabled) {
    background: #229954;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(39, 174, 96, 0.3);
}

.btn-large {
    padding: 16px 32px;
    font-size: 18px;
}

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

/* Break and Interpreter input sections */
.break-input, .interpreter-input {
    display: grid;
    grid-template-columns: 1fr 1fr auto;
    gap: 15px;
    align-items: end;
    margin-bottom: 20px;
}

/* List containers */
.list-container {
    border: 2px solid #e1e8ed;
    border-radius: 8px;
    min-height: 120px;
    max-height: 200px;
    overflow-y: auto;
    margin-bottom: 15px;
    background: #f8f9fa;
}

.list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 15px;
    border-bottom: 1px solid #e1e8ed;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.list-item:last-child {
    border-bottom: none;
}

.list-item:hover {
    background-color: #e3f2fd;
}

.list-item.selected {
    background-color: #bbdefb;
    border-left: 4px solid #2196f3;
}

.list-item-info {
    flex: 1;
}

.list-item-name {
    font-weight: 600;
    color: #2c3e50;
}

.list-item-details {
    font-size: 0.85rem;
    color: #7f8c8d;
    margin-top: 2px;
}

.empty-message {
    text-align: center;
    color: #95a5a6;
    padding: 40px 20px;
    font-style: italic;
}

/* Action buttons */
.break-actions, .interpreter-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

/* Generate section */
.generate-section {
    text-align: center;
}

.button-group {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-bottom: 15px;
}

.button-group .btn {
    min-width: 150px;
}

.status-message {
    margin-top: 15px;
    padding: 10px;
    border-radius: 6px;
    font-weight: 500;
}

.status-message.success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.status-message.error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.status-message.info {
    background-color: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

/* Schedule preview */
.preview-container {
    overflow-x: auto;
}

.schedule-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

.schedule-table table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.schedule-table th,
.schedule-table td {
    padding: 12px;
    text-align: center;
    border: 1px solid #e1e8ed;
}

.schedule-table th {
    background-color: #3498db;
    color: white;
    font-weight: 600;
    position: sticky;
    top: 0;
}

.schedule-table tr:nth-child(even) {
    background-color: #f8f9fa;
}

.schedule-table tr:hover {
    background-color: #e3f2fd;
}

.schedule-table .break-cell {
    background-color: #ffebee !important;
    color: #c62828;
    font-weight: 600;
}

.schedule-table .assignment-cell {
    background-color: #e8f5e8;
    color: #2e7d32;
    font-weight: 600;
}

/* Header with filter styling */
.header-with-filter {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
}

.header-with-filter span {
    font-weight: 600;
    font-size: 0.9em;
}

.filter-dropdown {
    padding: 4px 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 0.8em;
    background-color: white;
    cursor: pointer;
    min-width: 80px;
}

.filter-dropdown:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

.filter-dropdown:hover {
    border-color: #3498db;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .card {
        padding: 20px;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .break-input, .interpreter-input {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .break-actions, .interpreter-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .schedule-table {
        font-size: 14px;
    }
    
    .schedule-table th,
    .schedule-table td {
        padding: 8px 6px;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.8rem;
    }
    
    .card {
        padding: 15px;
    }
    
    .schedule-table {
        font-size: 12px;
    }
    
    .schedule-table th,
    .schedule-table td {
        padding: 6px 4px;
    }
}

/* Loading animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 10px;
}

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

/* Scrollbar styling */
.list-container::-webkit-scrollbar {
    width: 8px;
}

.list-container::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

.list-container::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 4px;
}

.list-container::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8;
}