/* ============================================================
   Sistema de Gestión de Tareas Pendientes
   Estilos Premium — Dark Theme + Glassmorphism
   ============================================================ */

/* ============================================================
   1. IMPORTS & VARIABLES
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
    /* Colores base */
    --bg-primary: #0a0a1a;
    --bg-secondary: #12122a;
    --bg-card: rgba(22, 22, 50, 0.6);
    --bg-card-hover: rgba(30, 30, 65, 0.8);
    --bg-glass: rgba(255, 255, 255, 0.04);
    --bg-glass-hover: rgba(255, 255, 255, 0.08);
    --bg-modal-overlay: rgba(0, 0, 0, 0.7);

    /* Bordes */
    --border-glass: rgba(255, 255, 255, 0.08);
    --border-glass-hover: rgba(255, 255, 255, 0.15);
    --border-focus: rgba(99, 102, 241, 0.5);

    /* Texto */
    --text-primary: #f0f0ff;
    --text-secondary: #8888aa;
    --text-muted: #5a5a7a;
    --text-inverse: #0a0a1a;

    /* Acentos y colores de prioridad */
    --accent-primary: #6366f1;
    --accent-primary-glow: rgba(99, 102, 241, 0.3);
    --accent-secondary: #818cf8;

    --priority-alta: #ef4444;
    --priority-alta-bg: rgba(239, 68, 68, 0.12);
    --priority-alta-border: rgba(239, 68, 68, 0.3);
    --priority-alta-glow: rgba(239, 68, 68, 0.2);

    --priority-media: #f59e0b;
    --priority-media-bg: rgba(245, 158, 11, 0.12);
    --priority-media-border: rgba(245, 158, 11, 0.3);

    --priority-baja: #10b981;
    --priority-baja-bg: rgba(16, 185, 129, 0.12);
    --priority-baja-border: rgba(16, 185, 129, 0.3);

    /* Estados */
    --status-pendiente: #f59e0b;
    --status-en-proceso: #6366f1;
    --status-completada: #10b981;

    /* Gradientes */
    --gradient-header: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a78bfa 100%);
    --gradient-bg: radial-gradient(ellipse at top left, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
                    radial-gradient(ellipse at bottom right, rgba(139, 92, 246, 0.06) 0%, transparent 50%);

    /* Sombras */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.15);

    /* Bordes redondeados */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* Transiciones */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Espaciado */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
}

/* ============================================================
   2. RESET & BASE
   ============================================================ */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* Background ambient glow */
body::before {
    content: '';
    position: fixed;
    top: -200px;
    left: -200px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.06) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
    animation: ambientFloat 20s ease-in-out infinite;
}

body::after {
    content: '';
    position: fixed;
    bottom: -200px;
    right: -200px;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.05) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
    animation: ambientFloat 25s ease-in-out infinite reverse;
}

@keyframes ambientFloat {
    0%, 100% { transform: translate(0, 0); }
    25% { transform: translate(30px, 20px); }
    50% { transform: translate(-20px, 40px); }
    75% { transform: translate(20px, -10px); }
}

/* ============================================================
   3. LAYOUT PRINCIPAL
   ============================================================ */
.app-container {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-lg);
    min-height: 100vh;
}

/* ============================================================
   4. HEADER
   ============================================================ */
.app-header {
    margin-bottom: var(--space-xl);
}

.header-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
    gap: var(--space-md);
}

.header-brand {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.header-logo {
    width: 48px;
    height: 48px;
    background: var(--gradient-header);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: var(--shadow-glow);
}

.header-title {
    font-size: 1.75rem;
    font-weight: 800;
    background: var(--gradient-header);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.header-subtitle {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 400;
    margin-top: 2px;
}

.header-actions {
    display: flex;
    gap: var(--space-sm);
    align-items: center;
}

/* ============================================================
   5. STATS CARDS
   ============================================================ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.stat-card {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-header);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.stat-card:hover {
    background: var(--bg-glass-hover);
    border-color: var(--border-glass-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-card:hover::before {
    opacity: 1;
}

.stat-card--highlight {
    border-color: var(--priority-alta-border);
}

.stat-card--highlight::before {
    background: linear-gradient(90deg, var(--priority-alta), #f97316);
    opacity: 1;
}

.stat-icon {
    font-size: 1.5rem;
    margin-bottom: var(--space-sm);
}

.stat-value {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: var(--space-xs);
}

/* ============================================================
   6. TOOLBAR (Filtros + Búsqueda + Botón Nueva Tarea)
   ============================================================ */
.toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
    gap: var(--space-md);
}

.filter-group {
    display: flex;
    gap: var(--space-xs);
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-full);
    padding: 4px;
    backdrop-filter: blur(10px);
}

.filter-btn {
    padding: 8px 18px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-family: 'Inter', sans-serif;
    font-size: 0.82rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.filter-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.06);
}

.filter-btn.active {
    background: var(--accent-primary);
    color: #fff;
    box-shadow: 0 2px 10px var(--accent-primary-glow);
}

.search-box {
    position: relative;
    flex: 0 1 300px;
    min-width: 200px;
}

.search-box input {
    width: 100%;
    padding: 10px 16px 10px 42px;
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-full);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 0.85rem;
    transition: all var(--transition-fast);
    backdrop-filter: blur(10px);
}

.search-box input::placeholder {
    color: var(--text-muted);
}

.search-box input:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.search-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 0.9rem;
    pointer-events: none;
}

/* ============================================================
   7. BOTÓN NUEVA TAREA
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 10px 22px;
    border: none;
    border-radius: var(--radius-full);
    font-family: 'Inter', sans-serif;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-header);
    color: #fff;
    box-shadow: 0 2px 12px var(--accent-primary-glow);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 20px var(--accent-primary-glow);
}

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

.btn-secondary {
    background: var(--bg-glass);
    color: var(--text-primary);
    border: 1px solid var(--border-glass);
    backdrop-filter: blur(10px);
}

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

.btn-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--priority-alta);
    border: 1px solid var(--priority-alta-border);
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.2);
}

.btn-sm {
    padding: 6px 14px;
    font-size: 0.78rem;
}

.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-glass);
    background: var(--bg-glass);
    color: var(--text-secondary);
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    background: var(--bg-glass-hover);
    color: var(--text-primary);
    border-color: var(--border-glass-hover);
}

/* ============================================================
   8. LISTA DE TAREAS
   ============================================================ */
.tasks-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.tasks-empty {
    text-align: center;
    padding: var(--space-2xl) var(--space-lg);
    color: var(--text-muted);
}

.tasks-empty-icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
    opacity: 0.5;
}

.tasks-empty-text {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: var(--space-xs);
}

.tasks-empty-sub {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ============================================================
   9. TASK CARD
   ============================================================ */
.task-card {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: var(--space-md) var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    transition: all var(--transition-base);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    animation: slideIn var(--transition-slow) ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.task-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    transition: all var(--transition-fast);
}

.task-card[data-prioridad="Alta"]::before {
    background: var(--priority-alta);
    box-shadow: 0 0 8px var(--priority-alta-glow);
}

.task-card[data-prioridad="Media"]::before {
    background: var(--priority-media);
}

.task-card[data-prioridad="Baja"]::before {
    background: var(--priority-baja);
}

.task-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-glass-hover);
    transform: translateX(4px);
    box-shadow: var(--shadow-sm);
}

.task-card.completed {
    opacity: 0.5;
}

.task-card.completed .task-title {
    text-decoration: line-through;
    color: var(--text-muted);
}

/* Checkbox de completar */
.task-checkbox {
    position: relative;
    flex-shrink: 0;
}

.task-checkbox input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 22px;
    height: 22px;
    border: 2px solid var(--border-glass-hover);
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    background: transparent;
}

.task-checkbox input[type="checkbox"]:hover {
    border-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.1);
}

.task-checkbox input[type="checkbox"]:checked {
    background: var(--status-completada);
    border-color: var(--status-completada);
}

.task-checkbox input[type="checkbox"]:checked::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #fff;
    font-size: 14px;
    font-weight: 700;
}

/* Contenido de la tarea */
.task-content {
    flex: 1;
    min-width: 0;
}

.task-title {
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 4px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.task-meta {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.task-meta-item {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.task-meta-item .meta-icon {
    font-size: 0.8rem;
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.badge-alta {
    background: var(--priority-alta-bg);
    color: var(--priority-alta);
    border: 1px solid var(--priority-alta-border);
}

.badge-media {
    background: var(--priority-media-bg);
    color: var(--priority-media);
    border: 1px solid var(--priority-media-border);
}

.badge-baja {
    background: var(--priority-baja-bg);
    color: var(--priority-baja);
    border: 1px solid var(--priority-baja-border);
}

.badge-origen {
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent-secondary);
    border: 1px solid rgba(99, 102, 241, 0.2);
}

/* Acciones de la tarea */
.task-actions {
    display: flex;
    gap: var(--space-xs);
    flex-shrink: 0;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.task-card:hover .task-actions {
    opacity: 1;
}

/* ============================================================
   10. MODAL
   ============================================================ */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg-modal-overlay);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

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

.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 580px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    transform: scale(0.95) translateY(10px);
    transition: transform var(--transition-base);
}

.modal-overlay.active .modal {
    transform: scale(1) translateY(0);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-lg) var(--space-xl);
    border-bottom: 1px solid var(--border-glass);
}

.modal-title {
    font-size: 1.15rem;
    font-weight: 700;
}

.modal-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: var(--bg-glass);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 1.1rem;
    transition: all var(--transition-fast);
}

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

.modal-body {
    padding: var(--space-xl);
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-sm);
    padding: var(--space-lg) var(--space-xl);
    border-top: 1px solid var(--border-glass);
}

/* ============================================================
   11. FORM ELEMENTS
   ============================================================ */
.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.form-label {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.form-input,
.form-textarea,
.form-select {
    padding: 10px 14px;
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.form-textarea {
    min-height: 80px;
    resize: vertical;
    line-height: 1.5;
}

.form-select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238888aa' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

.form-select option {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

/* Radio group para prioridad */
.priority-selector {
    display: flex;
    gap: var(--space-sm);
}

.priority-option {
    flex: 1;
}

.priority-option input[type="radio"] {
    display: none;
}

.priority-option label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px;
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.82rem;
    font-weight: 600;
    transition: all var(--transition-fast);
    text-align: center;
}

.priority-option label:hover {
    border-color: var(--border-glass-hover);
    background: var(--bg-glass-hover);
}

.priority-option input[type="radio"]:checked + label.priority-alta-label {
    background: var(--priority-alta-bg);
    border-color: var(--priority-alta-border);
    color: var(--priority-alta);
}

.priority-option input[type="radio"]:checked + label.priority-media-label {
    background: var(--priority-media-bg);
    border-color: var(--priority-media-border);
    color: var(--priority-media);
}

.priority-option input[type="radio"]:checked + label.priority-baja-label {
    background: var(--priority-baja-bg);
    border-color: var(--priority-baja-border);
    color: var(--priority-baja);
}

/* ============================================================
   12. NOTAS / COMENTARIOS
   ============================================================ */
.notes-section {
    margin-top: var(--space-md);
}

.notes-title {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: var(--space-sm);
}

.notes-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    max-height: 200px;
    overflow-y: auto;
    padding-right: var(--space-xs);
}

.note-item {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    padding: var(--space-sm) var(--space-md);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-sm);
}

.note-content {
    flex: 1;
    font-size: 0.85rem;
    color: var(--text-primary);
    line-height: 1.5;
}

.note-date {
    font-size: 0.7rem;
    color: var(--text-muted);
    white-space: nowrap;
    flex-shrink: 0;
}

.note-add-form {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-sm);
}

.note-add-form input {
    flex: 1;
}

/* ============================================================
   13. ESTADOS DE CARGA Y VACÍO
   ============================================================ */
.loading-spinner {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-2xl);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-glass);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Toast notification */
.toast-container {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-lg);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.toast {
    background: var(--bg-secondary);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: var(--space-md) var(--space-lg);
    color: var(--text-primary);
    font-size: 0.85rem;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    animation: toastSlide var(--transition-base) ease-out;
    backdrop-filter: blur(20px);
}

.toast-success {
    border-left: 3px solid var(--status-completada);
}

.toast-error {
    border-left: 3px solid var(--priority-alta);
}

.toast-info {
    border-left: 3px solid var(--accent-primary);
}

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

/* ============================================================
   14. SCROLLBAR CUSTOM
   ============================================================ */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-glass);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-glass-hover);
}

/* ============================================================
   15. RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
    .app-container {
        padding: var(--space-md);
    }

    .header-top {
        flex-direction: column;
        align-items: flex-start;
    }

    .header-title {
        font-size: 1.4rem;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .toolbar {
        flex-direction: column;
        align-items: stretch;
    }

    .filter-group {
        overflow-x: auto;
        justify-content: flex-start;
    }

    .search-box {
        flex: 1 1 100%;
    }

    .task-card {
        padding: var(--space-md);
    }

    .task-actions {
        opacity: 1;
    }

    .task-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }

    .modal {
        max-width: 100%;
        border-radius: var(--radius-lg);
    }

    .modal-body {
        padding: var(--space-lg);
    }

    .priority-selector {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .stat-card {
        padding: var(--space-md);
    }

    .stat-value {
        font-size: 1.5rem;
    }

    .filter-btn {
        padding: 6px 12px;
        font-size: 0.78rem;
    }

    .header-actions {
        width: 100%;
        justify-content: flex-end;
    }
}

/* ============================================================
   16. ANIMACIONES DE TRANSICIÓN DE ESTADO
   ============================================================ */
.task-card.completing {
    animation: completeTask 0.5s ease-out forwards;
}

@keyframes completeTask {
    0% {
        background: var(--bg-glass);
    }
    50% {
        background: rgba(16, 185, 129, 0.1);
        border-color: var(--status-completada);
    }
    100% {
        opacity: 0.5;
        background: var(--bg-glass);
    }
}

.task-card.removing {
    animation: removeTask 0.4s ease-out forwards;
}

@keyframes removeTask {
    to {
        opacity: 0;
        transform: translateX(-100px);
        max-height: 0;
        padding: 0;
        margin: 0;
        overflow: hidden;
    }
}

/* Pulsating dot for real-time indicator */
.realtime-indicator {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.realtime-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--status-completada);
    animation: pulse 2s ease-in-out infinite;
}

.realtime-dot.disconnected {
    background: var(--priority-alta);
    animation: none;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.8); }
}

/* Transcription info box */
.transcription-box {
    background: rgba(99, 102, 241, 0.06);
    border: 1px solid rgba(99, 102, 241, 0.15);
    border-radius: var(--radius-sm);
    padding: var(--space-md);
    margin-top: var(--space-sm);
}

.transcription-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: var(--space-xs);
    display: flex;
    align-items: center;
    gap: 6px;
}

.transcription-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
    font-style: italic;
}

/* ============================================================
   17. CALENDAR & VIEW TOGGLE STYLES
   ============================================================ */
.toolbar-right {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.client-filter-select {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    color: var(--text-primary);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    cursor: pointer;
}

.client-filter-select option {
    background: #0f172a;
    color: #ffffff;
}

.task-client-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    color: #38bdf8;
    background: rgba(56, 189, 248, 0.1);
    border: 1px solid rgba(56, 189, 248, 0.25);
    padding: 2px 8px;
    border-radius: 12px;
}

.view-toggle {
    display: flex;
    background: rgba(255, 255, 255, 0.05);
    padding: 3px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-glass);
}

.view-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 6px 14px;
    font-size: 0.85rem;
    font-weight: 500;
    border-radius: calc(var(--radius-sm) - 2px);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.view-btn:hover {
    color: var(--text-primary);
}

.view-btn.active {
    background: var(--accent-gradient);
    color: #ffffff;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

/* Calendar Container */
.calendar-container {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    animation: fadeIn var(--transition-base) ease-out;
}

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

.calendar-month-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
    text-transform: capitalize;
}

.calendar-header-actions {
    display: flex;
    gap: var(--space-xs);
}

.calendar-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    text-align: center;
    font-weight: 600;
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--border-glass);
    margin-bottom: var(--space-sm);
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 8px;
    min-height: 480px;
}

.calendar-day {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: var(--radius-sm);
    padding: 8px;
    min-height: 90px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    transition: all var(--transition-fast);
    cursor: pointer;
    position: relative;
}

.calendar-day:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--border-glass-hover);
}

.calendar-day.other-month {
    opacity: 0.3;
    background: transparent;
}

.calendar-day.today {
    border: 1.5px solid var(--accent-primary);
    background: rgba(99, 102, 241, 0.08);
}

.calendar-day-number {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.calendar-day.today .calendar-day-number {
    background: var(--accent-primary);
    color: #ffffff;
}

.calendar-day-tasks {
    display: flex;
    flex-direction: column;
    gap: 4px;
    overflow-y: auto;
    max-height: 90px;
}

.calendar-task-pill {
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 0.72rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: all var(--transition-fast);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.calendar-task-pill:hover {
    transform: scale(1.03);
}

.calendar-task-pill[data-prio="Alta"] {
    background: rgba(239, 68, 68, 0.25);
    color: #fca5a5;
    border: 1px solid rgba(239, 68, 68, 0.5);
}

.calendar-task-pill[data-prio="Media"] {
    background: rgba(245, 158, 11, 0.25);
    color: #fde68a;
    border: 1px solid rgba(245, 158, 11, 0.5);
}

.calendar-task-pill[data-prio="Baja"] {
    background: rgba(16, 185, 129, 0.25);
    color: #6ee7b7;
    border: 1px solid rgba(16, 185, 129, 0.5);
}

.calendar-task-pill.completed {
    opacity: 0.5;
    text-decoration: line-through;
}