/* ===== VARIABLES CSS ===== */
:root {
    /* Colores principales */
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    
    /* Colores de fondo */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #334155;
    --bg-overlay: rgba(0, 0, 0, 0.8);
    
    /* Colores de texto */
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    /* Bordes y sombras */
    --border-color: #475569;
    --border-light: #64748b;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Espaciado */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Bordes redondeados */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transiciones */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

/* ===== TEMA CLARO ===== */
.theme-light {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-card: #ffffff;
    --bg-overlay: rgba(0, 0, 0, 0.5);
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --border-light: #cbd5e1;
}

/* ===== TEMA ROSA ===== */
.theme-rosa {
    --primary-color: #ec4899;
    --primary-hover: #db2777;
    --secondary-color: #be185d;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    
    /* Colores de fondo */
    --bg-primary: #fdf2f8;
    --bg-secondary: #fce7f3;
    --bg-card: #ffffff;
    --bg-overlay: rgba(236, 72, 153, 0.2);
    
    /* Colores de texto */
    --text-primary: #831843;
    --text-secondary: #be185d;
    --text-muted: #ec4899;
    
    /* Bordes y sombras */
    --border-color: #f9a8d4;
    --border-light: #fbcfe8;
    --shadow-sm: 0 1px 2px 0 rgba(236, 72, 153, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(236, 72, 153, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(236, 72, 153, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(236, 72, 153, 0.15);
}

/* ===== TEMA NEON ===== */
.theme-neon {
    --primary-color: #8b5cf6;
    --primary-hover: #7c3aed;
    --secondary-color: #c4b5fd;
    --success-color: #00ff88;
    --danger-color: #ff3366;
    --warning-color: #ffdd00;
    
    /* Colores de fondo */
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a2e;
    --bg-card: #16213e;
    --bg-overlay: rgba(139, 92, 246, 0.3);
    
    /* Colores de texto */
    --text-primary: #00ffff;
    --text-secondary: #c4b5fd;
    --text-muted: #a78bfa;
    
    /* Bordes y sombras */
    --border-color: #3730a3;
    --border-light: #4338ca;
    --shadow-sm: 0 1px 2px 0 rgba(139, 92, 246, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(139, 92, 246, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(139, 92, 246, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(139, 92, 246, 0.4);
}

/* ===== RESET Y BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ===== LAYOUT PRINCIPAL ===== */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    width: 100%;
}

/* ===== HEADER ===== */
.app-header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    flex: 1;
}

/* Botón volver */
.button-wrap {
    position: relative;
    display: inline-block;
}

.button-wrap button {
    background: var(--primary-color);
    border: none;
    border-radius: var(--radius-lg);
    padding: var(--spacing-sm);
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    position: relative;
    z-index: 2;
}

.button-wrap button:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
}

.button-shadow {
    position: absolute;
    top: 4px;
    left: 0;
    right: 0;
    bottom: -4px;
    background: var(--primary-hover);
    border-radius: var(--radius-lg);
    z-index: 1;
    opacity: 0.3;
}

/* Título y subtítulo */
.app-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.app-title svg {
    color: var(--primary-color);
}

.app-subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* ===== CONTENIDO PRINCIPAL ===== */
.main-content {
    flex: 1;
    padding: var(--spacing-lg);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: calc(100vh - 120px);
}

.container {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-color);
    width: 100%;
    max-width: 800px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

/* ===== DISPLAY PRINCIPAL ===== */
.main-display {
    margin-bottom: var(--spacing-xl);
}

.course-display {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    color: white;
    box-shadow: var(--shadow-lg);
}

.course-name {
    display: block;
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.student-count {
    display: block;
    font-size: 0.875rem;
    opacity: 0.9;
}

/* ===== CONTROLES ===== */
.controls-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.control-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.control-section label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.modern-select {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition-fast);
    cursor: pointer;
}

.modern-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.modern-select:hover {
    border-color: var(--border-light);
}

.add-course-btn {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    border: none;
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    color: white;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
    font-weight: 600;
    box-shadow: 0 2px 4px rgba(16, 185, 129, 0.2);
    margin-top: var(--spacing-xs);
}

.add-course-btn:hover {
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(16, 185, 129, 0.3);
}

/* ===== BOTONES DE ACCIÓN ===== */
.action-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.btn-action {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
    text-decoration: none;
    min-height: 56px;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    background: var(--border-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-success:hover {
    background: #059669;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-danger:hover {
    background: #dc2626;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* ===== INDICADOR DE ESTADO ===== */
.status-indicator {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ===== MODALES ===== */
.groups-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-overlay);
    z-index: 1000;
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
}

.groups-modal.show,
.groups-modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.modal-content {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-color);
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.modal-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-secondary);
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.close-modal {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.close-modal:hover {
    background: var(--bg-primary);
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    background: var(--bg-secondary);
}

/* ===== CONTENEDOR DE GRUPOS ===== */
.groups-container {
    display: grid;
    gap: var(--spacing-lg);
}

.group-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: var(--transition-fast);
    position: relative;
}

.group-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.group-card.drop-target {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
}

.group-card.drop-active {
    border-color: var(--success-color);
    background: rgba(16, 185, 129, 0.1);
}

.group-card.source-group {
    opacity: 0.7;
}

.group-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
}

.group-header h3 {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1.125rem;
    margin: 0;
}

.group-students {
    display: grid;
    gap: var(--spacing-sm);
    min-height: 60px;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    border: 2px dashed transparent;
    transition: var(--transition-fast);
}

.group-students.drag-over {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
}

/* ===== TARJETAS DE ESTUDIANTES ===== */
.student-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: grab;
    transition: var(--transition-fast);
    user-select: none;
}

.student-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.student-card.dragging {
    opacity: 0.5;
    transform: rotate(5deg);
    cursor: grabbing;
}

.student-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
    flex-shrink: 0;
}

.student-info {
    flex: 1;
    min-width: 0;
}

.student-name {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-xs);
}

.student-email {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* ===== ESTADOS DE ARRASTRE ===== */
.drop-indicator {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    z-index: 1001;
    pointer-events: none;
    opacity: 0;
    transition: var(--transition-fast);
    display: none;
}

.drop-indicator.show {
    opacity: 1;
}

.drag-indicator {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    z-index: 1001;
    pointer-events: none;
    opacity: 0;
    transition: var(--transition-fast);
    display: none;
}

.drag-indicator.show {
    opacity: 1;
}

/* ===== NOTIFICACIONES ===== */
.move-notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--success-color);
    color: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    z-index: 1002;
    animation: slideInRight 0.3s ease-out;
}

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

/* ===== ESTADOS VACÍOS ===== */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-muted);
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.empty-state-text {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.empty-state-subtext {
    font-size: 0.875rem;
}

/* ===== TABS ===== */
.tabs-container {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: var(--spacing-lg);
    overflow-x: auto;
}

.groups-modal .tab-btn {
    background: none !important;
    border: none !important;
    padding: var(--spacing-md) var(--spacing-lg) !important;
    color: var(--text-secondary) !important;
    cursor: pointer !important;
    border-bottom: 2px solid transparent !important;
    transition: var(--transition-fast) !important;
    white-space: nowrap !important;
    font-weight: 500 !important;
    position: relative !important;
    font-size: 0.875rem !important;
}

.groups-modal .tab-btn.active {
    color: var(--primary-color) !important;
    border-bottom-color: var(--primary-color) !important;
    background: rgba(99, 102, 241, 0.05) !important;
    font-weight: 600 !important;
}

.groups-modal .tab-btn:hover {
    color: var(--text-primary) !important;
    background: rgba(99, 102, 241, 0.02) !important;
}

.groups-modal .tab-btn:focus-visible {
    outline: 2px solid var(--primary-color) !important;
    outline-offset: -2px !important;
}

/* Estilos generales para tabs */
.tab-btn {
    background: none;
    border: none;
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-secondary);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: var(--transition-fast);
    white-space: nowrap;
    font-weight: 500;
    position: relative;
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
}

.tab-btn:hover {
    color: var(--text-primary);
    background: rgba(99, 102, 241, 0.02);
}

.tab-btn:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: -2px;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* ===== FORMULARIOS ===== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--text-primary);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

/* ===== BOTONES DE MODAL ===== */
.btn-modal {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-primary);
}

.btn-modal:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-modal:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Colores específicos para botones del modal */
.groups-modal .btn-modal.btn-primary {
    background: var(--primary-color) !important;
    color: white !important;
    border: 1px solid var(--primary-color) !important;
}

.groups-modal .btn-modal.btn-primary:hover {
    background: var(--primary-hover) !important;
    border-color: var(--primary-hover) !important;
}

.groups-modal .btn-modal.btn-secondary {
    background: var(--secondary-color) !important;
    color: white !important;
    border: 1px solid var(--secondary-color) !important;
}

.groups-modal .btn-modal.btn-secondary:hover {
    background: #475569 !important;
    border-color: #475569 !important;
}

.groups-modal .btn-modal.btn-success {
    background: var(--success-color) !important;
    color: white !important;
    border: 1px solid var(--success-color) !important;
}

.groups-modal .btn-modal.btn-success:hover {
    background: #059669 !important;
    border-color: #059669 !important;
}

.groups-modal .btn-modal.btn-danger {
    background: var(--danger-color) !important;
    color: white !important;
    border: 1px solid var(--danger-color) !important;
}

.groups-modal .btn-modal.btn-danger:hover {
    background: #dc2626 !important;
    border-color: #dc2626 !important;
}

/* Estilos adicionales para asegurar que los botones se vean correctamente */
.groups-modal .btn-modal {
    background: var(--secondary-color) !important;
    color: white !important;
    border: 1px solid var(--secondary-color) !important;
    font-weight: 600 !important;
    text-shadow: none !important;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1) !important;
    min-height: 40px !important;
    padding: var(--spacing-sm) var(--spacing-lg) !important;
    border-radius: var(--radius-md) !important;
    cursor: pointer !important;
    transition: all var(--transition-fast) !important;
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    gap: var(--spacing-xs) !important;
    font-size: 0.875rem !important;
    line-height: 1.4 !important;
    position: relative !important;
    z-index: 10 !important;
}

.groups-modal .btn-modal:hover {
    transform: translateY(-1px) !important;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15) !important;
}

.groups-modal .btn-modal:active {
    transform: translateY(0) !important;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1) !important;
}

/* Mejoras para el footer del modal */
.modal-footer {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    align-items: center;
    flex-wrap: wrap;
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

/* Estilos específicos para el modal del gestor */
.groups-modal.manage-modal .modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

.groups-modal.manage-modal .modal-header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.groups-modal.manage-modal .modal-body {
    background: var(--bg-card);
    padding: var(--spacing-lg);
}

/* Mejoras para las secciones de botones */
.load-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-start;
    align-items: center;
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}



/* Estilos específicos para botones dentro de section-block */
.section-block .btn-modal {
    margin-top: var(--spacing-md);
    min-width: 140px;
    justify-content: center;
}

.section-block .btn-modal:first-of-type {
    margin-top: 0;
}

/* Mejoras para el contenedor de tabs */
.groups-modal .tabs-container {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    margin: calc(-1 * var(--spacing-lg)) calc(-1 * var(--spacing-lg)) var(--spacing-lg) calc(-1 * var(--spacing-lg));
    padding: 0 var(--spacing-lg);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

/* ===== BOTONES DE ACCIÓN EN GRUPOS GUARDADOS ===== */
.saved-group-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    flex-wrap: wrap;
}

.action-btn {
    padding: var(--spacing-xs) var(--spacing-md);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    text-decoration: none;
    min-height: 32px;
    justify-content: center;
}

.action-btn.load {
    background: var(--primary-color);
    color: white;
    border: 1px solid var(--primary-color);
}

.action-btn.load:hover {
    background: var(--primary-hover);
    border-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.action-btn.edit {
    background: var(--warning-color);
    color: white;
    border: 1px solid var(--warning-color);
}

.action-btn.edit:hover {
    background: #d97706;
    border-color: #d97706;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.action-btn.delete {
    background: var(--danger-color);
    color: white;
    border: 1px solid var(--danger-color);
}

.action-btn.delete:hover {
    background: #dc2626;
    border-color: #dc2626;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.action-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.action-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* ===== BÚSQUEDA Y FILTROS ===== */
.saved-groups-header {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.search-container {
    position: relative;
    flex: 1;
    min-width: 200px;
}

.search-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.search-icon {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.filter-select {
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    min-width: 150px;
}

/* ===== LISTAS ===== */
.saved-groups-list,
.available-groups-list {
    max-height: 400px;
    overflow-y: auto;
}

.saved-group-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    cursor: pointer;
    transition: var(--transition-fast);
    position: relative;
}

.saved-group-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.saved-group-item.selected {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
}

.saved-group-item:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.saved-group-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
}

.saved-group-title {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
    margin: 0;
    display: flex;
    align-items: center;
}

.saved-group-date {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.saved-group-info {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.saved-group-course,
.saved-group-count {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.saved-group-description {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-style: italic;
}

/* ===== SECCIONES ===== */
.section-block {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.section-block h4 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.section-block p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

/* ===== VISTA PREVIA ===== */
.groups-preview {
    margin-top: var(--spacing-xl);
}

.save-preview-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    max-height: 300px;
    overflow-y: auto;
}



/* ===== RESPONSIVIDAD ===== */

/* Tablet (768px - 1023px) */
@media (max-width: 1023px) {
    .app-header {
        padding: var(--spacing-lg);
    }
    
    .header-content {
    flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    
    .header-left {
        width: 100%;
        justify-content: space-between;
    }
    
    .main-content {
        padding: var(--spacing-md);
    }
    
    .container {
        padding: var(--spacing-lg);
        margin: 0;
        border-radius: var(--radius-lg);
    }
    
    .controls-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .action-buttons {
        grid-template-columns: 1fr;
    }
    
    .btn-action {
        min-height: 64px;
        font-size: 1.125rem;
    }
    
    .modal-content {
        margin: var(--spacing-md);
        max-height: calc(100vh - 2rem);
    }
    
    .tabs-container {
        flex-wrap: wrap;
    }
    
    .tab-btn {
        flex: 1;
        min-width: 120px;
        text-align: center;
    }
    
    .saved-groups-header {
    flex-direction: column;
    }
    
    .search-container {
        min-width: 100%;
    }
}

/* Móvil (hasta 767px) */
@media (max-width: 767px) {
    html {
        font-size: 14px;
    }
    
    .app-header {
        padding: var(--spacing-md);
    }
    
    .header-content {
        gap: var(--spacing-sm);
    }
    
    .header-left {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    
    .app-title {
        font-size: 1.25rem;
    }
    
    .app-subtitle {
        font-size: 0.8rem;
    }
    
    .main-content {
        padding: var(--spacing-sm);
    }
    
    .container {
        padding: var(--spacing-md);
        border-radius: var(--radius-md);
    }
    
    .course-display {
        padding: var(--spacing-lg);
    }
    
    .course-name {
        font-size: 1.125rem;
    }
    
    .controls-grid {
        gap: var(--spacing-md);
    }
    
    .action-buttons {
        gap: var(--spacing-sm);
    }
    
    .btn-action {
        min-height: 56px;
    font-size: 1rem;
        padding: var(--spacing-md);
    }
    
    .modal-content {
        margin: var(--spacing-sm);
        border-radius: var(--radius-lg);
    }
    
    .modal-header,
    .modal-body,
    .modal-footer {
        padding: var(--spacing-md);
    }
    
    .modal-footer {
        flex-direction: column;
    }
    
    .btn-modal {
        width: auto;
        min-width: 120px;
        padding: var(--spacing-md);
        justify-content: center;
    }
    
    .tabs-container {
        flex-direction: column;
    }
    
    .tab-btn {
        border-bottom: 1px solid var(--border-color);
        border-right: none;
        text-align: left;
    }
    
    .tab-btn.active {
        border-right: 2px solid var(--primary-color);
        border-bottom-color: var(--primary-color);
    }
    
    .group-members {
        flex-direction: column;
    }
    
    .member-tag {
        text-align: center;
    }
    
    .saved-groups-header {
        gap: var(--spacing-sm);
    }
    
    .search-container,
    .filter-container {
        width: 100%;
    }
    
    .section-block {
        padding: var(--spacing-md);
    }
}

/* Móvil pequeño (hasta 480px) */
@media (max-width: 480px) {
    .app-header {
        padding: var(--spacing-sm);
    }
    
    .header-content {
        gap: var(--spacing-sm);
    }
    
    .button-wrap button {
        width: 40px;
        height: 40px;
    }
    
    .app-title {
        font-size: 1.125rem;
    }
    
    .main-content {
        padding: var(--spacing-xs);
    }
    
    .container {
        padding: var(--spacing-sm);
        border-radius: var(--radius-sm);
    }
    
    .course-display {
        padding: var(--spacing-md);
    }
    
    .btn-action {
        min-height: 48px;
        font-size: 0.875rem;
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .add-course-btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.8rem;
    }
    
    .modal-content {
        margin: var(--spacing-xs);
        border-radius: var(--radius-md);
    }
    
    .modal-header,
    .modal-body,
    .modal-footer {
        padding: var(--spacing-sm);
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .btn-modal {
        width: 100%;
        justify-content: center;
    }
    
    .load-actions {
        flex-direction: column;
        width: 100%;
    }
    
    .load-actions .btn-modal {
        width: 100%;
    }
    
    /* Responsive para botones de acción */
    .saved-group-actions {
        flex-direction: column;
        gap: var(--spacing-xs);
    }
    
    .action-btn {
        width: 100%;
        justify-content: center;
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.875rem;
    }
    
    .group-card {
        padding: var(--spacing-md);
    }
    
    .saved-group-item {
        padding: var(--spacing-md);
    }
}

/* ===== ANIMACIONES ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.container {
    animation: fadeIn 0.5s ease-out;
}

.modal-content {
    animation: slideIn 0.3s ease-out;
}

/* ===== ESTADOS DE CARGA ===== */
.loading {
    /* Círculo de carga removido */
}

/* ===== ACCESIBILIDAD ===== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus visible para navegación por teclado */
button:focus-visible,
select:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* ===== UTILIDADES ===== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

/* ===== NUEVOS ESTILOS PARA SELECTOR DE MODO ===== */

/* Selector de modo principal */
.mode-selector {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.mode-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xl);
}

.mode-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    max-width: 600px;
    margin: 0 auto;
}

.mode-option {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-align: left;
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    min-height: 120px;
}

.mode-option:hover {
    border-color: var(--primary-color);
    background: var(--bg-card);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.mode-option.selected {
    border-color: var(--primary-color);
    background: var(--primary-color);
    color: white;
}

.mode-icon {
    font-size: 2.5rem;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    flex-shrink: 0;
}

.mode-option.selected .mode-icon {
    background: rgba(255, 255, 255, 0.2);
}

.mode-content h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: inherit;
}

.mode-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.mode-option.selected .mode-content p {
    color: rgba(255, 255, 255, 0.8);
}

/* Panel de encabezado */
.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.panel-header h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.back-to-mode {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.back-to-mode:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

/* Panel de estudiante individual */
.single-student-panel {
    animation: fadeIn 0.3s ease-in-out;
}

.single-student-controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

/* Checkbox personalizado */
.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    cursor: pointer;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.checkbox-label:hover {
    background: var(--bg-card);
    border-color: var(--primary-color);
}

.checkbox-label input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    position: relative;
    flex-shrink: 0;
    margin-top: 2px;
    transition: all var(--transition-fast);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 12px;
    font-weight: bold;
}

.help-text {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
    line-height: 1.4;
}

/* Display del estudiante seleccionado */
.selected-student-display {
    margin-top: var(--spacing-xl);
    animation: slideIn 0.3s ease-in-out;
}

.student-card {
    background: var(--bg-secondary);
    border: 2px solid var(--primary-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

/* Animación de respiración removida */

.student-avatar {
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    flex-shrink: 0;
}

.student-info h4 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.student-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 0;
}

/* Panel de grupos */
.groups-panel {
    animation: fadeIn 0.3s ease-in-out;
}

/* Responsive para el selector de modo */
@media (max-width: 768px) {
    .mode-options {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .mode-option {
        padding: var(--spacing-lg);
        min-height: 100px;
    }
    
    .mode-icon {
        width: 50px;
        height: 50px;
        font-size: 2rem;
    }
    
    .mode-content h4 {
        font-size: 1rem;
    }
    
    .mode-content p {
        font-size: 0.85rem;
    }
    
    .panel-header {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: flex-start;
    }
    
    .back-to-mode {
        align-self: flex-end;
    }
    
    .student-card {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-md);
    }
    
    .student-avatar {
        width: 80px;
        height: 80px;
        font-size: 2rem;
    }
}

/* ===== ESTILOS PARA EFECTO DE SUSPENSE ===== */

.suspense-effect {
    margin-top: var(--spacing-xl);
    animation: fadeIn 0.3s ease-in-out;
}

.suspense-container {
    background: var(--bg-secondary);
    border: 2px solid var(--primary-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.suspense-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.1), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

.suspense-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    position: relative;
    z-index: 2;
}

.suspense-animation {
    margin: var(--spacing-xl) 0;
    position: relative;
    z-index: 2;
}

.spinning-names {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.spinning-name {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: all 0.1s ease;
    white-space: nowrap;
}

.spinning-name.active {
    opacity: 1;
    animation: namePop 0.1s ease-out;
}

.spinning-name.final {
    opacity: 1;
    animation: finalReveal 0.5s ease-out;
    color: var(--success-color);
}

@keyframes namePop {
    0% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.8);
    }
    100% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }
}

@keyframes finalReveal {
    0% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.5);
    }
    50% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1.2);
    }
    100% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }
}



/* Efectos adicionales para el suspense */
.suspense-container.loading {
    /* Animación de respiración removida */
}

.suspense-container.finalizing {
    border-color: var(--success-color);
    animation: successPulse 0.5s ease-out;
}

@keyframes successPulse {
    0% {
        border-color: var(--primary-color);
        box-shadow: var(--shadow-lg);
    }
    50% {
        border-color: var(--success-color);
        box-shadow: 0 0 20px rgba(16, 185, 129, 0.3);
    }
    100% {
        border-color: var(--success-color);
        box-shadow: var(--shadow-lg);
    }
}

/* Responsive para el efecto de suspense */
@media (max-width: 768px) {
    .suspense-container {
        padding: var(--spacing-lg);
    }
    
    .suspense-title {
        font-size: 1.1rem;
    }
    
    .spinning-names {
        font-size: 1.5rem;
        min-height: 50px;
    }
    

}