/* 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;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.15);
}

* {
    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: 1600px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    background: var(--primary-color);
    color: var(--white);
    padding: 30px;
    border-radius: 15px;
    margin-bottom: 30px;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.header-left h1 {
    font-size: 28px;
    margin-bottom: 5px;
}

.subtitle {
    font-size: 14px;
    opacity: 0.9;
}

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

.year-selector {
    padding: 10px 15px;
    font-size: 16px;
    border: none;
    border-radius: 8px;
    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: 15px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.stat-number {
    font-size: 42px;
    font-weight: bold;
    color: var(--secondary-color);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 13px;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Controls Bar */
.controls-bar {
    background: var(--white);
    padding: 20px;
    border-radius: 15px;
    margin-bottom: 30px;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.toggle-control {
    display: flex;
    align-items: center;
    gap: 15px;
}

.toggle-label {
    font-weight: 600;
    color: var(--text-dark);
}

/* Toggle Switch */
.switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--success-color);
}

input:checked + .slider:before {
    transform: translateX(26px);
}

/* Filter Controls */
.filter-controls {
    display: flex;
    gap: 15px;
    align-items: center;
    flex-wrap: wrap;
}

.filter-select {
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    background-color: var(--white);
    cursor: pointer;
    transition: border-color 0.2s;
}

.filter-select:focus {
    outline: none;
    border-color: var(--secondary-color);
}

/* Buttons */
.btn-primary,
.btn-secondary {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
}

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

.btn-primary:hover {
    background-color: #2980b9;
    box-shadow: var(--shadow);
}

.btn-secondary {
    background-color: var(--white);
    color: var(--text-dark);
    border: 2px solid var(--border-color);
}

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

/* Cards Grid */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 25px;
    align-items: start;
    justify-content: center;
}

/* Classroom Card */
.card-aula {
    background: var(--white);
    border-radius: 15px;
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: all 0.3s;
    border: 3px solid transparent;
}

.card-aula:hover {
    box-shadow: var(--shadow-hover);
}

/* Highlight card when it has pending assignments */
.card-aula.has-pending {
    border: 2px solid var(--danger-color);
    background-color: rgba(231, 76, 60, 0.02);
}

.card-aula.has-pending .card-aula-header {
    background: var(--danger-color);
    color: var(--white);
}

.card-aula.collapsed .card-aula-body {
    display: none;
}

.card-aula-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--white);
    padding: 20px;
    cursor: pointer;
    user-select: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.3s;
}

.card-aula-header:hover {
    background: linear-gradient(135deg, #5568d3 0%, #6a3f8d 100%);
}

.card-aula-header-content {
    flex: 1;
}

.card-aula-title {
    font-size: 22px;
    font-weight: bold;
    margin-bottom: 5px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-badge {
    background: var(--danger-color);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    box-shadow: 0 2px 8px rgba(231, 76, 60, 0.4);
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.05);
        opacity: 0.9;
    }
}

.card-aula-subtitle {
    font-size: 14px;
    opacity: 0.9;
}

.card-aula-toggle {
    font-size: 24px;
    transition: transform 0.3s;
}

.card-aula.collapsed .card-aula-toggle {
    transform: rotate(-90deg);
}

.card-aula-body {
    padding: 20px;
}

.card-aula-stats {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--light-bg);
}

.card-aula-stat {
    flex: 1;
    text-align: center;
    padding: 10px;
    background: var(--light-bg);
    border-radius: 8px;
}

.card-aula-stat-number {
    font-size: 24px;
    font-weight: bold;
    color: var(--secondary-color);
}

.card-aula-stat-label {
    font-size: 11px;
    color: var(--text-light);
    text-transform: uppercase;
}

/* Course Cards */
.courses-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.card-curso {
    background: var(--light-bg);
    border-radius: 12px;
    overflow: hidden;
    border: 2px solid transparent;
    transition: all 0.3s;
}

.card-curso:hover {
    border-color: var(--secondary-color);
    box-shadow: 0 2px 8px rgba(52, 152, 219, 0.2);
}

.card-curso.has-unassigned:hover {
    border-color: var(--danger-color);
    box-shadow: 0 2px 8px rgba(231, 76, 60, 0.4);
}

.card-curso-header {
    background: var(--secondary-color);
    color: var(--white);
    padding: 12px 15px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

/* Highlight course card when teacher is not assigned */
.card-curso.has-unassigned {
    background: var(--danger-color) !important;
    border: 2px solid var(--danger-color);
}

.card-curso.has-unassigned .card-curso-header {
    background: var(--danger-color);
    color: var(--white);
}

.card-curso.has-unassigned .card-curso-body {
    background: rgba(231, 76, 60, 0.1);
    border-top: 1px solid var(--danger-color);
}

.card-curso.collapsed .card-curso-body {
    display: none;
}

.card-curso-title {
    font-size: 16px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.course-code {
    background: rgba(255, 255, 255, 0.3);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: bold;
}

.card-curso-toggle {
    font-size: 18px;
    transition: transform 0.3s;
}

.card-curso.collapsed .card-curso-toggle {
    transform: rotate(-90deg);
}

.card-curso-body {
    padding: 15px;
    background: var(--white);
}

.teacher-assignment {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.teacher-label {
    font-weight: 600;
    color: var(--text-dark);
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.teacher-select {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    background-color: var(--white);
    cursor: pointer;
    transition: all 0.2s;
}

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

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

.btn-save-teacher {
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, var(--success-color), #229954);
    color: var(--white);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s;
}

.btn-save-teacher:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(39, 174, 96, 0.3);
}

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

.recommendation-tag {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 6px 12px;
    background: linear-gradient(135deg, #e8f4f8, #d1ecf1);
    color: var(--secondary-color);
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    margin-top: 8px;
}

/* Loading */
.loading-message {
    text-align: center;
    padding: 60px 20px;
    grid-column: 1 / -1;
}

.spinner {
    border: 4px solid var(--light-bg);
    border-top: 4px solid var(--secondary-color);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

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

/* Alert Messages */
.alert {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 15px 20px;
    border-radius: 10px;
    font-weight: 600;
    z-index: 9999;
    animation: slideInRight 0.3s ease-out;
    box-shadow: var(--shadow-hover);
    max-width: 400px;
}

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

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border-left: 4px solid var(--success-color);
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    border-left: 4px solid var(--danger-color);
}

.alert-warning {
    background-color: #fff3cd;
    color: #856404;
    border-left: 4px solid var(--warning-color);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    grid-column: 1 / -1;
}

.empty-state-icon {
    font-size: 64px;
    margin-bottom: 20px;
    opacity: 0.5;
}

.empty-state-text {
    font-size: 18px;
    color: var(--text-light);
}

/* Responsive Design */
@media (max-width: 1200px) {
    .cards-grid {
        grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    }
}

@media (max-width: 768px) {
    header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .header-controls {
        width: 100%;
        justify-content: flex-start;
    }
    
    .controls-bar {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .filter-controls {
        width: 100%;
        flex-direction: column;
    }
    
    .filter-select {
        width: 100%;
    }
    
    .cards-grid {
        grid-template-columns: 1fr;
    }
}

/* Course Type Colors - Single professional color */
.course-com, .course-mat, .course-cyt, .course-pso, .course-rel, .course-ear { 
    background: var(--secondary-color) !important;
}