/* =================================================================
   SUBJECTS PROFESSIONAL STYLES - StudyHub
   Diseño profesional avanzado para asignaturas con información 
   detallada del salón y características avanzadas
================================================================= */

/* Variables específicas para asignaturas */
:root {
    --subjects-gradient-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --subjects-card-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
    --subjects-card-hover-shadow: 0 16px 48px rgba(0, 0, 0, 0.2);
    --subjects-header-bg: rgba(255, 255, 255, 0.95);
    --subjects-border: rgba(102, 126, 234, 0.2);
    --subjects-accent: #667eea;
}

/* Header profesional de asignaturas */
.subjects-header {
    background: var(--subjects-header-bg);
    padding: 25px 30px;
    border-radius: var(--border-radius-lg);
    margin-bottom: 30px;
    border: 1px solid var(--subjects-border);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.subjects-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--subjects-gradient-bg);
    z-index: 1;
}

.subjects-header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.subjects-title {
    display: flex;
    align-items: center;
    gap: 15px;
}

.subjects-title h2 {
    color: var(--text-primary);
    font-size: 1.75rem;
    font-weight: 700;
    margin: 0;
    background: linear-gradient(135deg, var(--text-primary), var(--subjects-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subjects-title i {
    font-size: 1.5rem;
    color: var(--subjects-accent);
    background: linear-gradient(135deg, var(--subjects-accent), #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subjects-stats {
    display: flex;
    gap: 20px;
    align-items: center;
}

.stat-pill {
    background: var(--bg-secondary);
    padding: 8px 16px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.stat-pill i {
    margin-right: 6px;
    color: var(--subjects-accent);
}

/* Controles y filtros */
.subjects-controls {
    display: flex;
    gap: 15px;
    align-items: center;
    flex-wrap: wrap;
}

.subjects-view-toggle {
    display: flex;
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: 4px;
    border: 1px solid var(--border-color);
}

.view-toggle-btn {
    padding: 8px 12px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.875rem;
    border-radius: calc(var(--border-radius) - 2px);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 6px;
}

.view-toggle-btn.active {
    background: var(--subjects-accent);
    color: white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.view-toggle-btn:hover:not(.active) {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* Grid de asignaturas */
.subjects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
    gap: 25px;
    padding: 0;
}

.subjects-grid.list-view {
    grid-template-columns: 1fr;
    gap: 15px;
}

/* Tarjeta de asignatura profesional */
.subject-card {
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    padding: 0;
    box-shadow: var(--subjects-card-shadow);
    border: 1px solid var(--border-color);
    transition: all var(--transition-medium);
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.subject-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: var(--subject-color, var(--subjects-accent));
    z-index: 1;
}

.subject-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--subjects-card-hover-shadow);
    border-color: var(--subject-color, var(--subjects-accent));
}

.subject-card:hover::before {
    height: 8px;
}

/* Header de la tarjeta */
.subject-card-header {
    padding: 25px 25px 15px;
    position: relative;
    background: linear-gradient(135deg, 
        rgba(var(--subject-color-rgb, 102, 126, 234), 0.05),
        rgba(var(--subject-color-rgb, 102, 126, 234), 0.02)
    );
}

.subject-card-title {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

.subject-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
    line-height: 1.3;
    flex: 1;
    margin-right: 15px;
}

.subject-color-indicator {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--subject-color, var(--subjects-accent));
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    border: 3px solid white;
    flex-shrink: 0;
}

.subject-professor {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    margin-bottom: 8px;
}

.subject-professor i {
    color: var(--subject-color, var(--subjects-accent));
    font-size: 0.875rem;
}

/* ESTILOS PARA MOSTRAR EL SALÓN EN LÍNEA (SIMPLE Y DIRECTO) */
.subject-room-inline {
    display: inline-flex;
    align-items: center;
    gap: 8px; /* Espacio entre icono y texto */
    margin-left: 15px; /* Separación del nombre del profesor */
    font-weight: 600; /* Texto del salón en negrita */
    color: var(--text-primary); /* Color de texto principal, alta visibilidad */
    font-size: 0.95rem; /* Mismo tamaño que el profesor */
}

.subject-room-inline i.fa-solid {
    color: var(--subject-color, var(--subjects-accent)); /* Icono con el color de la asignatura */
    font-size: 1em; /* Tamaño del icono consistente */
}

.subject-room-inline .separator {
    display: none; /* No necesitamos el separador de punto */
}

/* Información del salón - DESTACADA */
.subject-room-info {
    background: linear-gradient(135deg, 
        rgba(var(--subject-color-rgb, 102, 126, 234), 0.1),
        rgba(var(--subject-color-rgb, 102, 126, 234), 0.05)
    );
    padding: 15px;
    border-radius: var(--border-radius);
    margin: 15px 0;
    border: 1px solid rgba(var(--subject-color-rgb, 102, 126, 234), 0.2);
    position: relative;
}

.subject-room-info::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--subject-color, var(--subjects-accent));
    border-radius: 0 4px 4px 0;
}

.room-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

.room-icon {
    background: var(--subject-color, var(--subjects-accent));
    color: white;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

.room-title {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.room-number {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--subject-color, var(--subjects-accent));
    margin-bottom: 5px;
}

.room-details {
    display: flex;
    gap: 15px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.room-detail {
    display: flex;
    align-items: center;
    gap: 5px;
}

.room-detail i {
    color: var(--subject-color, var(--subjects-accent));
    font-size: 0.8rem;
}

/* Contenido de la tarjeta */
.subject-card-content {
    padding: 0 25px 20px;
}

.subject-schedule {
    background: var(--bg-secondary);
    padding: 12px 15px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    margin-bottom: 15px;
}

.schedule-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.schedule-header i {
    color: var(--subject-color, var(--subjects-accent));
}

.schedule-time {
    font-size: 1rem;
    font-weight: 700;
    color: var(--subject-color, var(--subjects-accent));
    margin-bottom: 5px;
}

.schedule-days {
    display: flex;
    gap: 5px;
    flex-wrap: wrap;
}

.day-pill {
    background: rgba(var(--subject-color-rgb, 102, 126, 234), 0.1);
    color: var(--subject-color, var(--subjects-accent));
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    border: 1px solid rgba(var(--subject-color-rgb, 102, 126, 234), 0.2);
}

/* Estadísticas de la asignatura */
.subject-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 15px;
}

.subject-stat {
    text-align: center;
    padding: 10px 8px;
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.subject-stat:hover {
    background: rgba(var(--subject-color-rgb, 102, 126, 234), 0.05);
    border-color: rgba(var(--subject-color-rgb, 102, 126, 234), 0.3);
}

.stat-number {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--subject-color, var(--subjects-accent));
    display: block;
    margin-bottom: 2px;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Acciones de la tarjeta */
.subject-card-actions {
    display: flex;
    gap: 8px;
    padding: 0 25px 25px;
}

.action-btn {
    flex: 1;
    padding: 10px;
    border: 1px solid var(--border-color);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.action-btn:hover {
    background: var(--subject-color, var(--subjects-accent));
    color: white;
    border-color: var(--subject-color, var(--subjects-accent));
    transform: translateY(-2px);
}

.action-btn i {
    font-size: 0.8rem;
}

.action-btn.primary {
    background: var(--subject-color, var(--subjects-accent));
    color: white;
    border-color: var(--subject-color, var(--subjects-accent));
}

.action-btn.primary:hover {
    background: rgba(var(--subject-color-rgb, 102, 126, 234), 0.8);
    transform: translateY(-2px) scale(1.05);
}

/* Botón de eliminar con estilo distintivo */
.action-btn.delete-subject {
    background: #dc3545;
    color: white;
    border-color: #dc3545;
}

.action-btn.delete-subject:hover {
    background: #c82333;
    border-color: #bd2130;
    transform: translateY(-2px);
}

/* Vista de lista */
.subject-card.list-view {
    display: flex;
    align-items: center;
    padding: 20px 25px;
    margin-bottom: 0;
}

.subject-card.list-view .subject-card-header {
    padding: 0;
    background: none;
    flex: 1;
    display: flex;
    align-items: center;
    gap: 20px;
}

.subject-card.list-view .subject-room-info {
    margin: 0;
    padding: 10px 15px;
    flex: 0 0 200px;
}

.subject-card.list-view .subject-card-content {
    padding: 0;
    flex: 0 0 250px;
}

.subject-card.list-view .subject-card-actions {
    padding: 0;
    flex: 0 0 120px;
    flex-direction: column;
}

/* Estados especiales */
.subject-card.no-room {
    opacity: 0.8;
}

.subject-card.no-room .subject-room-info {
    background: linear-gradient(135deg, rgba(149, 165, 166, 0.1), rgba(149, 165, 166, 0.05));
    border-color: rgba(149, 165, 166, 0.2);
}

.subject-card.no-room .room-number {
    color: var(--text-secondary);
}

.subject-card.no-room .room-number::before {
    content: 'No asignado';
    font-size: 0.85rem;
    font-weight: 500;
}

/* Animaciones de entrada */
.subject-card {
    animation: fadeInUp 0.6s ease-out;
    animation-fill-mode: both;
}

.subject-card:nth-child(1) { animation-delay: 0.1s; }
.subject-card:nth-child(2) { animation-delay: 0.2s; }
.subject-card:nth-child(3) { animation-delay: 0.3s; }
.subject-card:nth-child(4) { animation-delay: 0.4s; }
.subject-card:nth-child(5) { animation-delay: 0.5s; }
.subject-card:nth-child(6) { animation-delay: 0.6s; }

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Estados de carga */
.subjects-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.subjects-loading i {
    font-size: 3rem;
    color: var(--subjects-accent);
    margin-bottom: 20px;
    animation: pulse 2s infinite;
}

.subjects-loading p {
    font-size: 1.1rem;
    font-weight: 500;
}

/* Estado vacío */
.subjects-empty {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-secondary);
}

.subjects-empty i {
    font-size: 4rem;
    color: var(--subjects-accent);
    margin-bottom: 25px;
    opacity: 0.7;
}

.subjects-empty h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.subjects-empty p {
    font-size: 1rem;
    margin-bottom: 25px;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.5;
}

/* =================================================================
   RESPONSIVE DESIGN PROFESIONAL
================================================================= */

@media (max-width: 1024px) {
    .subjects-grid {
        grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
        gap: 20px;
    }
    
    .subjects-header-content {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .subjects-controls {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .subjects-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .subjects-header {
        padding: 20px;
    }
    
    .subjects-stats {
        flex-direction: column;
        gap: 10px;
        align-items: flex-start;
    }
    
    .subject-card-header {
        padding: 20px 20px 10px;
    }
    
    .subject-card-content {
        padding: 0 20px 15px;
    }
    
    .subject-card-actions {
        padding: 0 20px 20px;
        flex-direction: column;
    }
    
    .subject-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .room-details {
        flex-direction: column;
        gap: 8px;
    }
}

@media (max-width: 480px) {
    .subjects-header {
        padding: 15px;
    }
    
    .subjects-title h2 {
        font-size: 1.5rem;
    }
    
    .subject-card-header {
        padding: 15px 15px 10px;
    }
    
    .subject-card-content {
        padding: 0 15px 12px;
    }
    
    .subject-card-actions {
        padding: 0 15px 15px;
    }
    
    .subject-name {
        font-size: 1.1rem;
    }
    
    .room-number {
        font-size: 1rem;
    }
}