/* =================================================================
   SISTEMA DE LOADING Y COMPONENTES RESPONSIVOS
   ================================================================= */

/* Loading Spinner Global */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

.loading-content {
    background: white;
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    max-width: 300px;
    width: 90%;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 15px;
}

.loading-text {
    color: #333;
    font-size: 16px;
    font-weight: 500;
}

/* Spinner pequeño para botones */
.btn .loading-spinner {
    width: 16px;
    height: 16px;
    border-width: 2px;
    margin: 0;
    display: none;
}

.btn.loading .loading-spinner {
    display: inline-block;
}

.btn.loading span,
.btn.loading i:not(.loading-spinner) {
    display: none;
}

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

/* =================================================================
   MEJORAS RESPONSIVAS - LAYOUT PRINCIPAL
   ================================================================= */

/* Variables CSS para consistencia */
:root {
    --sidebar-width: 280px;
    --sidebar-width-mobile: 250px;
    --header-height: 70px;
    --mobile-breakpoint: 768px;
    --tablet-breakpoint: 1024px;
}

/* Layout principal responsivo */
.app {
    display: flex;
    min-height: 100vh;
    position: relative;
}

/* Sidebar responsivo */
.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    transition: transform 0.3s ease, width 0.3s ease;
    position: fixed;
    height: 100vh;
    z-index: 1000;
    left: 0;
    top: 0;
}

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    transition: margin-left 0.3s ease;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Estados del sidebar */
.sidebar.collapsed {
    transform: translateX(-100%);
}

.sidebar.collapsed + .main-content {
    margin-left: 0;
}

/* =================================================================
   RESPONSIVE BREAKPOINTS
   ================================================================= */

/* Tablets y pantallas medianas */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: 250px;
    }
    
    .dashboard-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 20px;
    }
    
    .section-header {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }
    
    .section-header .btn {
        align-self: stretch;
    }
}

/* Móviles */
@media (max-width: 768px) {
    :root {
        --sidebar-width: var(--sidebar-width-mobile);
        --header-height: 60px;
    }
    
    /* Sidebar móvil */
    .sidebar {
        transform: translateX(-100%);
        width: var(--sidebar-width-mobile);
        min-width: var(--sidebar-width-mobile);
    }
    
    .sidebar.mobile-open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    /* Header móvil */
    .header {
        padding: 0 15px;
        height: var(--header-height);
    }
    
    .mobile-menu-toggle {
        display: block !important;
    }
    
    /* Dashboard móvil */
    .dashboard-grid {
        grid-template-columns: 1fr;
        gap: 15px;
        padding: 15px;
    }
    
    /* Formularios móviles */
    .modal-content {
        width: 95%;
        max-width: none;
        margin: 10px;
        max-height: 90vh;
        overflow-y: auto;
    }
    
    .form-row {
        flex-direction: column;
    }
    
    .form-group {
        margin-bottom: 15px;
    }
    
    /* Botones móviles */
    .btn {
        padding: 12px 20px;
        font-size: 14px;
        min-height: 44px; /* Área de toque mínima */
    }
    
    /* Cards móviles */
    .card {
        margin-bottom: 15px;
        border-radius: 8px;
    }
    
    /* Navegación móvil */
    .sidebar-nav ul li a {
        padding: 15px 20px;
        font-size: 16px;
    }
    
    /* Calendar móvil */
    .calendar-container {
        padding: 10px;
    }
    
    #calendar {
        font-size: 12px;
    }
}

/* Móviles pequeños */
@media (max-width: 480px) {
    .dashboard-grid {
        padding: 10px;
        gap: 10px;
    }
    
    .modal-content {
        width: 98%;
        margin: 5px;
    }
    
    .btn {
        padding: 10px 15px;
        font-size: 13px;
    }
    
    .form-group input,
    .form-group textarea,
    .form-group select {
        font-size: 16px; /* Evita zoom en iOS */
    }
    
    .stat-card {
        padding: 15px;
    }
    
    .section-header h2 {
        font-size: 20px;
    }
}

/* =================================================================
   MEJORAS EN FORMULARIOS RESPONSIVOS
   ================================================================= */

.form-group {
    position: relative;
    margin-bottom: 20px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 15px 12px 45px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s ease;
    background: #fff;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: #8e9aaf;
    z-index: 1;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #2d3748;
    font-size: 14px;
}

.form-help {
    font-size: 12px;
    color: #718096;
    margin-top: 5px;
    display: block;
}

/* =================================================================
   SISTEMA DE NOTIFICACIONES RESPONSIVO
   ================================================================= */

.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    min-width: 300px;
    max-width: 400px;
    padding: 15px 20px;
    background: #27ae60;
    color: white;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    z-index: 10001;
    display: flex;
    align-items: center;
    gap: 10px;
    animation: slideInRight 0.3s ease;
    font-size: 14px;
    line-height: 1.4;
}

.notification.error {
    background: #e74c3c;
}

.notification.warning {
    background: #f39c12;
}

.notification.info {
    background: #3498db;
}

/* Notificaciones móviles */
@media (max-width: 768px) {
    .notification {
        top: 10px;
        right: 10px;
        left: 10px;
        min-width: auto;
        max-width: none;
        width: auto;
        font-size: 13px;
    }
}

@keyframes slideInRight {
    from { 
        transform: translateX(100%); 
        opacity: 0; 
    }
    to { 
        transform: translateX(0); 
        opacity: 1; 
    }
}

/* =================================================================
   MEJORAS EN CARDS Y COMPONENTES
   ================================================================= */

.card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    overflow: hidden;
}

.card:hover {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
    transform: translateY(-2px);
}

/* Cards responsivos */
@media (max-width: 768px) {
    .card {
        border-radius: 8px;
        margin-bottom: 15px;
    }
    
    .card:hover {
        transform: none; /* Deshabilitar hover en móvil */
    }
}

/* =================================================================
   UTILIDADES RESPONSIVAS
   ================================================================= */

/* Ocultar/mostrar elementos según pantalla */
.mobile-only {
    display: none;
}

.desktop-only {
    display: block;
}

@media (max-width: 768px) {
    .mobile-only {
        display: block;
    }
    
    .desktop-only {
        display: none;
    }
    
    .mobile-hidden {
        display: none !important;
    }
    
    .mobile-flex {
        display: flex !important;
    }
}

/* Espaciado responsivo */
.spacing-mobile {
    padding: 15px;
}

@media (min-width: 769px) {
    .spacing-mobile {
        padding: 30px;
    }
}

/* Texto responsivo */
.text-responsive {
    font-size: 14px;
}

@media (min-width: 769px) {
    .text-responsive {
        font-size: 16px;
    }
}

/* =================================================================
   OVERLAY PARA SIDEBAR MÓVIL
   ================================================================= */

.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.sidebar-overlay.active {
    opacity: 1;
    visibility: visible;
}

@media (min-width: 769px) {
    .sidebar-overlay {
        display: none;
    }
}