/* =================================================================
   CALENDAR PROFESSIONAL STYLES - StudyHub
   Diseño profesional avanzado para el calendario manteniendo la 
   consistencia con el sistema de diseño general
================================================================= */

/* Variables específicas del calendario */
:root {
    --calendar-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --calendar-header-bg: rgba(255, 255, 255, 0.95);
    --calendar-cell-hover: rgba(102, 126, 234, 0.08);
    --calendar-today-bg: rgba(102, 126, 234, 0.12);
    --calendar-event-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    --calendar-border: rgba(102, 126, 234, 0.2);
    --calendar-text-muted: rgba(255, 255, 255, 0.7);
}

/* Contenedor principal del calendario */
.calendar-container {
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    padding: 25px;
    box-shadow: var(--shadow-lg);
    position: relative;
    border: 1px solid var(--border-color);
}

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

/* Header del calendario */
.calendar-header {
    background: var(--calendar-header-bg);
    padding: 20px 30px;
    border-bottom: 2px solid var(--calendar-border);
    backdrop-filter: blur(10px);
    position: relative;
    z-index: 2;
    margin-bottom: 20px;
}

.calendar-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 15px;
}

.calendar-title h2 {
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

.calendar-title h2 i {
    color: var(--primary-color);
    font-size: 1.3rem;
}

/* Controles del calendario */
.calendar-controls {
    display: flex;
    align-items: center;
    gap: 10px;
}

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

.view-btn {
    padding: 8px 16px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: calc(var(--border-radius) - 2px);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

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

/* Leyenda del calendario */
.calendar-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    padding: 0;
    margin: 0;
    background: transparent;
    border: none;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    padding: 6px 12px;
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.legend-item:hover {
    background: var(--bg-tertiary);
    transform: translateY(-1px);
}

.legend-color {
    width: 14px;
    height: 14px;
    border-radius: 3px;
    flex-shrink: 0;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

/* Contenido del calendario */
.calendar-content {
    padding: 0;
    background: var(--bg-primary);
}

#calendar {
    min-height: 650px;
    width: 100%;
}

/* =================================================================
   FULLCALENDAR BASIC CUSTOMIZATION
================================================================= */

/* Toolbar del FullCalendar */
.fc-toolbar {
    background: var(--bg-secondary);
    padding: 15px 20px;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
}

.fc-toolbar-title {
    color: var(--text-primary) !important;
    font-size: 1.4rem !important;
    font-weight: 600 !important;
    margin: 0 !important;
}

/* Botones básicos */
.fc-button {
    background: var(--bg-primary) !important;
    border: 1px solid var(--border-color) !important;
    color: var(--text-primary) !important;
    font-weight: 500 !important;
    padding: 8px 16px !important;
    border-radius: var(--border-radius) !important;
    font-size: 0.875rem !important;
}

.fc-button:hover {
    background: var(--primary-color) !important;
    border-color: var(--primary-color) !important;
    color: white !important;
}

.fc-button-primary {
    background: var(--primary-color) !important;
    border-color: var(--primary-color) !important;
    color: white !important;
}

/* Vista del calendario */
.fc-theme-standard {
    border-color: var(--border-color) !important;
}

/* Headers de los días */
.fc-col-header {
    background: var(--bg-secondary) !important;
    border-bottom: 1px solid var(--border-color) !important;
}

.fc-col-header-cell-cushion {
    color: var(--text-primary) !important;
    font-weight: 600 !important;
    font-size: 0.875rem !important;
}

/* Celdas del calendario */
.fc-daygrid-day {
    background: var(--bg-primary) !important;
    border-right: 1px solid var(--border-light) !important;
    border-bottom: 1px solid var(--border-light) !important;
}

.fc-daygrid-day-number {
    color: var(--text-primary) !important;
    font-weight: 500 !important;
    padding: 8px !important;
}

/* Día actual */
.fc-day-today {
    background: rgba(102, 126, 234, 0.1) !important;
}

.fc-day-today .fc-daygrid-day-number {
    background: var(--primary-color) !important;
    color: white !important;
    border-radius: 50% !important;
    width: 28px !important;
    height: 28px !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
}

/* Eventos básicos */
.fc-event {
    border-radius: 4px !important;
    padding: 2px 6px !important;
    margin: 1px !important;
    font-size: 0.75rem !important;
    font-weight: 500 !important;
    cursor: pointer !important;
}

.fc-event-title {
    font-weight: 500 !important;
}

.fc-event-title i {
    margin-right: 4px !important;
    font-size: 0.7rem !important;
}

/* =================================================================
   EVENTOS PROFESIONALES
================================================================= */

/* Estilos base para eventos */
.fc-event {
    border: none !important;
    border-radius: 6px !important;
    padding: 4px 8px !important;
    margin: 1px 2px !important;
    font-size: 0.75rem !important;
    font-weight: 500 !important;
    cursor: pointer !important;
    transition: all var(--transition-fast) !important;
    box-shadow: var(--calendar-event-shadow) !important;
    backdrop-filter: blur(5px) !important;
    position: relative !important;
    overflow: hidden !important;
}

.fc-event::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: currentColor;
    opacity: 0.8;
}

.fc-event:hover {
    transform: translateY(-2px) scale(1.05) !important;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2) !important;
    z-index: 10 !important;
}

.fc-event-title {
    font-weight: 500 !important;
    overflow: hidden !important;
    text-overflow: ellipsis !important;
    white-space: nowrap !important;
    display: flex !important;
    align-items: center !important;
    gap: 4px !important;
}

.fc-event-title i {
    font-size: 0.7rem !important;
    opacity: 0.9 !important;
}

/* Eventos de tareas con diseño profesional */
.fc-event.calendar-task {
    border-left: 4px solid !important;
    background: rgba(255, 255, 255, 0.95) !important;
    color: var(--text-primary) !important;
    position: relative !important;
}

.fc-event.calendar-task::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 0;
    height: 0;
    border-left: 8px solid transparent;
    border-right: 8px solid currentColor;
    border-bottom: 8px solid transparent;
    opacity: 0.6;
}

/* Estados de tareas con gradientes profesionales */
.fc-event.task-terminado {
    background: linear-gradient(135deg, #2ecc71, #27ae60) !important;
    color: white !important;
    opacity: 0.9 !important;
    border-left-color: #229954 !important;
}

.fc-event.task-terminado .fc-event-title {
    text-decoration: line-through !important;
}

.fc-event.task-en_progreso {
    background: linear-gradient(135deg, #3498db, #2980b9) !important;
    color: white !important;
    border-left-color: #2471a3 !important;
}

.fc-event.task-pendiente {
    background: linear-gradient(135deg, #95a5a6, #7f8c8d) !important;
    color: white !important;
    border-left-color: #5d6d7e !important;
}

/* Prioridades con efectos visuales mejorados */
.fc-event.priority-high {
    background: linear-gradient(135deg, #e74c3c, #c0392b) !important;
    color: white !important;
    border-left-color: #a93226 !important;
    animation: pulse-high 2s infinite;
}

.fc-event.priority-medium {
    background: linear-gradient(135deg, #f39c12, #e67e22) !important;
    color: white !important;
    border-left-color: #d68910 !important;
}

.fc-event.priority-low {
    background: linear-gradient(135deg, #27ae60, #229954) !important;
    color: white !important;
    border-left-color: #1e8449 !important;
}

/* Animaciones sutiles */
@keyframes pulse-high {
    0%, 100% { box-shadow: 0 2px 8px rgba(231, 76, 60, 0.3); }
    50% { box-shadow: 0 4px 16px rgba(231, 76, 60, 0.5); }
}

/* Tipos de eventos con iconografía mejorada */
.fc-event.event-exam {
    background: linear-gradient(135deg, #9b59b6, #8e44ad) !important;
    color: white !important;
    border-left-color: #7d3c98 !important;
}

.fc-event.event-assignment {
    background: linear-gradient(135deg, #34495e, #2c3e50) !important;
    color: white !important;
    border-left-color: #1b2631 !important;
}

.fc-event.event-class {
    background: linear-gradient(135deg, #16a085, #138d75) !important;
    color: white !important;
    border-left-color: #117a65 !important;
}

.fc-event.event-personal {
    background: linear-gradient(135deg, #e67e22, #d35400) !important;
    color: white !important;
    border-left-color: #ba4a00 !important;
}

/* =================================================================
   TOOLTIP PROFESIONAL
================================================================= */

.event-tooltip {
    background: linear-gradient(135deg, #2c3e50, #34495e) !important;
    color: white !important;
    padding: 16px 20px !important;
    border-radius: var(--border-radius) !important;
    font-size: 0.875rem !important;
    line-height: 1.5 !important;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3) !important;
    z-index: 9999 !important;
    max-width: 280px !important;
    backdrop-filter: blur(10px) !important;
    border: 1px solid rgba(255, 255, 255, 0.1) !important;
    position: relative !important;
}

.event-tooltip::before {
    content: '';
    position: absolute;
    top: -8px;
    left: 20px;
    width: 0;
    height: 0;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-bottom: 8px solid #2c3e50;
}

.event-tooltip strong {
    color: #ecf0f1 !important;
    font-weight: 600 !important;
    font-size: 0.95rem !important;
    display: block !important;
    margin-bottom: 8px !important;
    padding-bottom: 8px !important;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2) !important;
}

.event-tooltip i {
    margin-right: 6px !important;
    opacity: 0.9 !important;
    font-size: 0.8rem !important;
}

.event-tooltip small {
    display: block !important;
    margin: 4px 0 !important;
    opacity: 0.9 !important;
}

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

@media (max-width: 1024px) {
    .calendar-container {
        margin: 10px;
    }
    
    .calendar-header {
        padding: 15px 20px;
    }
    
    .calendar-content {
        padding: 20px;
    }
    
    .calendar-title {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }
    
    .calendar-controls {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .fc-toolbar {
        flex-direction: column !important;
        gap: 15px !important;
        text-align: center !important;
    }
    
    .fc-toolbar-chunk {
        display: flex !important;
        justify-content: center !important;
        flex-wrap: wrap !important;
        gap: 8px !important;
    }
    
    .fc-button {
        padding: 6px 12px !important;
        font-size: 0.8rem !important;
    }
    
    .fc-event.calendar-task,
    .fc-event {
        font-size: 0.7rem !important;
        padding: 2px 6px !important;
        margin: 1px !important;
    }
    
    .fc-event-title {
        overflow: hidden !important;
        text-overflow: ellipsis !important;
        white-space: nowrap !important;
    }
    
    .event-tooltip {
        font-size: 0.8rem !important;
        padding: 12px 16px !important;
        max-width: 240px !important;
    }
    
    .calendar-legend {
        flex-direction: column;
        gap: 8px;
    }
    
    .legend-item {
        justify-content: center;
        font-size: 0.8rem;
    }
    
    #calendar {
        min-height: 500px;
    }
}

@media (max-width: 480px) {
    .calendar-header {
        padding: 12px 15px;
    }
    
    .calendar-content {
        padding: 15px;
    }
    
    .calendar-title h2 {
        font-size: 1.25rem;
    }
    
    .fc-col-header-cell-cushion {
        font-size: 0.75rem !important;
    }
    
    .fc-daygrid-day-number {
        font-size: 0.8rem !important;
        width: 28px !important;
        height: 28px !important;
    }
}

/* =================================================================
   ESTADOS DE CARGA Y ANIMACIONES
================================================================= */

.calendar-loading {
    position: relative;
    pointer-events: none;
    opacity: 0.7;
}

.calendar-loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 32px;
    height: 32px;
    margin: -16px 0 0 -16px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    z-index: 1000;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Entrada suave del calendario */
.calendar-container {
    animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* =================================================================
   MODOS OSCURO/CLARO
================================================================= */

@media (prefers-color-scheme: dark) {
    :root {
        --calendar-header-bg: rgba(33, 37, 41, 0.95);
        --calendar-cell-hover: rgba(102, 126, 234, 0.15);
        --calendar-today-bg: rgba(102, 126, 234, 0.2);
        --calendar-text-muted: rgba(255, 255, 255, 0.6);
    }
    
    .fc-event.calendar-task {
        background: rgba(33, 37, 41, 0.95) !important;
        color: var(--text-primary) !important;
    }
}