/* Variables de Color */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --light-bg: #ecf0f1;
    --white: #ffffff;
    --border-color: #bdc3c7;
    --text-dark: #2c3e50;
    --text-light: #7f8c8d;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light-bg);
    color: var(--text-dark);
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 30px;
    border-radius: 10px;
    margin-bottom: 30px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

header h1 {
    font-size: 28px;
    margin-bottom: 10px;
}

.header-controls {
    display: flex;
    gap: 15px;
    align-items: center;
}

.year-selector {
    padding: 10px 15px;
    font-size: 16px;
    border: none;
    border-radius: 5px;
    background-color: var(--white);
    color: var(--text-dark);
    cursor: pointer;
    font-weight: 600;
}

/* Stats Cards */
.stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--white);
    padding: 25px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.stat-number {
    font-size: 36px;
    font-weight: bold;
    color: var(--secondary-color);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-light);
    text-transform: uppercase;
}

/* Filters */
.filters {
    background: var(--white);
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    align-items: flex-end;
}

.filter-group {
    flex: 1;
    min-width: 200px;
}

.filter-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    color: var(--text-dark);
    font-size: 14px;
}

.filter-group select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 14px;
    background-color: var(--white);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
}

.btn-primary,
.btn-secondary,
.btn-danger {
    padding: 12px 24px;
    border: none;
    border-radius: 5px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-transform: uppercase;
}

.btn-primary {
    background-color: var(--secondary-color);
    color: var(--white);
}

.btn-primary:hover {
    background-color: #2980b9;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background-color: var(--light-bg);
    color: var(--text-dark);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--border-color);
}

.btn-danger {
    background-color: var(--danger-color);
    color: var(--white);
}

.btn-danger:hover {
    background-color: #c0392b;
}

/* Table */
.table-container {
    background: var(--white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

table {
    width: 100%;
    border-collapse: collapse;
}

thead {
    background-color: var(--primary-color);
    color: var(--white);
}

th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
}

tbody tr {
    border-bottom: 1px solid var(--light-bg);
    transition: background-color 0.2s;
}

tbody tr:hover {
    background-color: #f8f9fa;
}

td {
    padding: 15px;
    font-size: 14px;
}

.loading {
    text-align: center;
    padding: 40px !important;
    color: var(--text-light);
    font-style: italic;
}

.no-data {
    text-align: center;
    padding: 40px;
    color: var(--text-light);
}

/* Teacher Cell */
.teacher-cell {
    display: flex;
    align-items: center;
    gap: 10px;
}

.teacher-select {
    flex: 1;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 13px;
}

.teacher-select.unassigned {
    border-color: var(--warning-color);
    background-color: #fff3cd;
}

.btn-save-teacher {
    padding: 6px 12px;
    background-color: var(--success-color);
    color: var(--white);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    font-weight: 600;
}

.btn-save-teacher:hover {
    background-color: #229954;
}

/* Recommendation */
.recommendation-tag {
    display: inline-block;
    padding: 4px 8px;
    background-color: #e8f4f8;
    color: var(--secondary-color);
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
}

/* Actions Column */
.actions-cell {
    display: flex;
    gap: 8px;
}

.btn-edit,
.btn-delete {
    padding: 6px 12px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    font-weight: 600;
    transition: all 0.2s;
}

.btn-edit {
    background-color: var(--secondary-color);
    color: var(--white);
}

.btn-edit:hover {
    background-color: #2980b9;
}

.btn-delete {
    background-color: var(--danger-color);
    color: var(--white);
}

.btn-delete:hover {
    background-color: #c0392b;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background-color: var(--white);
    margin: 5% auto;
    width: 90%;
    max-width: 700px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    animation: slideDown 0.3s;
}

@keyframes slideDown {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 30px;
    background-color: var(--primary-color);
    color: var(--white);
    border-radius: 10px 10px 0 0;
}

.modal-header h2 {
    margin: 0;
    font-size: 22px;
}

.close {
    color: var(--white);
    font-size: 32px;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
}

.close:hover {
    color: var(--light-bg);
}

.modal-body {
    padding: 30px;
}

/* Form Styles */
.form-group {
    margin-bottom: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    color: var(--text-dark);
    font-size: 14px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 14px;
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-hint {
    display: block;
    margin-top: 5px;
    font-size: 12px;
    color: var(--text-light);
    font-style: italic;
}

.recommendation-box {
    background-color: #e8f4f8;
    border-left: 4px solid var(--secondary-color);
    padding: 15px;
    margin: 20px 0;
    border-radius: 5px;
}

.recommendation-box strong {
    display: block;
    margin-bottom: 8px;
    color: var(--secondary-color);
}

.recommendation-box p {
    margin: 8px 0;
    color: var(--text-dark);
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    font-weight: normal;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    margin-right: 8px;
}

.form-actions {
    display: flex;
    gap: 15px;
    margin-top: 25px;
    justify-content: flex-end;
}

/* Responsive Design */
@media (max-width: 1200px) {
    table {
        font-size: 13px;
    }
    
    th, td {
        padding: 12px;
    }
}

@media (max-width: 768px) {
    header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .header-controls {
        width: 100%;
        margin-top: 15px;
    }
    
    .stats-container {
        grid-template-columns: 1fr;
    }
    
    .filters {
        flex-direction: column;
    }
    
    .filter-group {
        width: 100%;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .table-container {
        overflow-x: auto;
    }
    
    table {
        min-width: 1000px;
    }
}

/* Success/Error Messages */
.alert {
    padding: 15px 20px;
    margin-bottom: 20px;
    border-radius: 5px;
    font-weight: 600;
}

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

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

.alert-warning {
    background-color: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
}