/* 
   TaskFlow Design System & Stylesheet
   Product Design: Minimalist, clean, light-mode dashboard with micro-interactions.
*/

/* -------------------------------------------------------------
   1. VARIABLES & SYSTEM DEFAULTS
   ------------------------------------------------------------- */
:root {
    /* Dark cyber‑minimalist palette */
    --font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --bg-app: hsl(220, 30%, 12%);
    /* fondo principal casi negro */
    --bg-card: rgba(255, 255, 255, 0.07);
    /* vidrio translúcido */
    --bg-header: hsl(220, 30%, 16%);
    --text-primary: hsl(210, 30%, 96%);
    /* texto casi blanco */
    --text-secondary: hsl(210, 20%, 70%);
    --text-muted: hsl(210, 15%, 50%);
    /* Acents neón */
    --accent-violet: hsl(270, 90%, 60%);
    --accent-blue: hsl(200, 80%, 55%);
    /* Colores de columnas */
    --pending-color: hsl(270, 90%, 55%);
    --pending-bg-light: hsla(270, 90%, 55%, 0.12);
    --progress-color: hsl(200, 80%, 55%);
    --progress-bg-light: hsla(200, 80%, 55%, 0.12);
    --done-color: hsl(145, 63%, 50%);
    --done-bg-light: hsla(145, 70%, 50%, 0.12);
    /* Bordes y sombras */
    --border-color: hsl(220, 15%, 90%);
    --border-radius-lg: 16px;
    --border-radius-md: 12px;
    --border-radius-sm: 8px;
    --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.03), 0 1px 3px rgba(15, 23, 42, 0.02);
    --shadow-md: 0 10px 24px -4px rgba(15, 23, 42, 0.05), 0 4px 12px -2px rgba(15, 23, 42, 0.03);
    --shadow-lg: 0 20px 32px -8px rgba(15, 23, 42, 0.08), 0 8px 16px -4px rgba(15, 23, 42, 0.04);
    --transition-fast: 0.15s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-normal: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-slow: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    --max-width: 1280px;
}



:root {
    --font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --bg-app: hsl(220, 30%, 12%);
    --bg-card: rgba(255, 255, 255, 0.07);
    --bg-header: hsl(220, 30%, 16%);
    --text-primary: hsl(210, 30%, 96%);
    --text-secondary: hsl(210, 20%, 70%);
    --text-muted: hsl(210, 15%, 50%);
    --accent-violet: hsl(270, 90%, 60%);
    --accent-blue: hsl(200, 80%, 55%);
    --pending-color: hsl(270, 90%, 55%);
    --pending-bg-light: hsla(270, 90%, 55%, 0.12);
    --progress-color: hsl(200, 80%, 55%);
    --progress-bg-light: hsla(200, 80%, 55%, 0.12);
    --done-color: hsl(145, 63%, 50%);
    --done-bg-light: hsla(145, 70%, 50%, 0.12);
    --border-color: hsl(220, 15%, 90%);
    --border-radius-lg: 16px;
    --border-radius-md: 12px;
    --border-radius-sm: 8px;
    --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.03), 0 1px 3px rgba(15, 23, 42, 0.02);
    --shadow-md: 0 10px 24px -4px rgba(15, 23, 42, 0.05), 0 4px 12px -2px rgba(15, 23, 42, 0.03);
    --shadow-lg: 0 20px 32px -8px rgba(15, 23, 42, 0.08), 0 8px 16px -4px rgba(15, 23, 42, 0.04);
    --transition-fast: 0.15s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-normal: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    /* azul eléctrico - duplicated variables removed (already defined above) */

    /* Transiciones */

    /* Ancho máximo contenedor */

}

/* Restablecimiento de Estilos */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-app);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    font-size: 1rem;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* Contenedor Principal */
.app-container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    min-height: 100vh;
}

/* -------------------------------------------------------------
   2. HEADER / ENCABEZADO Y ESTADÍSTICAS
   ------------------------------------------------------------- */
.app-header {
    background-color: var(--bg-header);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem 2rem;
    display: grid;
    grid-template-columns: 1.2fr 1.5fr 1fr;
    align-items: center;
    gap: 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-icon {
    width: 44px;
    height: 44px;
    background-color: var(--pending-bg-light);
    color: var(--pending-color);
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: inset 0 0 0 1px hsla(224, 82%, 56%, 0.1);
}

.header-brand h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    color: var(--text-primary);
}

.header-brand .subtitle {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 400;
}

/* Panel de estadísticas */
.stats-panel {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-app);
    padding: 0.6rem 1.5rem;
    border-radius: var(--border-radius-md);
    gap: 1.2rem;
    width: fit-content;
    margin: 0 auto;
    border: 1px solid var(--border-color);
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 65px;
}

.stat-value {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
}

.stat-divider {
    width: 1px;
    height: 24px;
    background-color: var(--border-color);
}

/* Botones de acción */
.header-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
}

/* Botones Generales */
.btn {
    font-family: var(--font-family);
    font-size: 0.875rem;
    font-weight: 600;
    padding: 0.65rem 1.2rem;
    border-radius: var(--border-radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all var(--transition-fast);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-violet), var(--accent-blue));
    color: #fff;
    border: none;
    box-shadow: 0 2px 8px rgba(15, 23, 42, 0.2);
    transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
    padding: 0.7rem 1.4rem;
    border-radius: var(--border-radius-md);
    font-weight: 600;
}

.btn-primary:hover {
    background: linear-gradient(135deg, hsl(270, 95%, 70%), hsl(200, 95%, 70%));
    transform: translateY(-2px);
    box-shadow: 0 6px 14px rgba(15, 23, 42, 0.3);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 2px 6px rgba(15, 23, 42, 0.2);
}

.btn-primary:hover {
    background-color: hsl(200, 90%, 65%);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.15);
}

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

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

.btn-secondary:hover {
    background-color: var(--bg-card);
    border-color: var(--accent-violet);
    color: var(--text-primary);
}

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

.btn-icon {
    flex-shrink: 0;
}

/* -------------------------------------------------------------
   3. TABLERO KANBAN Y COLUMNAS
   ------------------------------------------------------------- */
.kanban-board {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    align-items: start;
    flex-grow: 1;
}

.kanban-column {
    /* Futuristic glass‑morphism with neon glow */
    background: linear-gradient(135deg, hsla(270, 90%, 55%, 0.15), hsla(200, 80%, 55%, 0.15)), var(--bg-card);
    border-radius: var(--border-radius-lg);
    border: 1px solid hsla(270, 90%, 55%, 0.4);
    display: flex;
    flex-direction: column;
    max-height: calc(100vh - 12rem);
    min-height: 450px;
    box-shadow: 0 0 12px hsla(270, 90%, 55%, 0.4), var(--shadow-sm);
    transition: box-shadow var(--transition-normal), border-color var(--transition-fast);
}

/* Hide column frame when empty */
.kanban-column:has(.cards-container:empty) {
    background: transparent;
    border: none;
    box-shadow: none;
}


.kanban-column:hover {
    box-shadow: var(--shadow-md);
}

/* Cabeceras de columna */
.column-option {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.35rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-right: 0.5rem;
}

.column-option:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: var(--accent-blue);
}

.column-option.selected {
    background: var(--accent-violet);
    color: white;
    border-color: var(--accent-violet);
}

.column-option .option-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}

.column-header {
    padding: 1.25rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.column-title-wrapper {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.column-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.indicator-pending {
    background-color: var(--pending-color);
}

.indicator-progress {
    background-color: var(--progress-color);
}

.indicator-done {
    background-color: var(--done-color);
}

.column-header h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.column-badge {
    background-color: var(--bg-app);
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    border: 1px solid var(--border-color);
}

/* Contenedor de Tarjetas */
.cards-container {
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    overflow-y: auto;
    flex-grow: 1;
    min-height: 150px;
    transition: background-color var(--transition-normal), outline var(--transition-normal);
    border-bottom-left-radius: var(--border-radius-lg);
    border-bottom-right-radius: var(--border-radius-lg);
}

/* Personalizar barra de desplazamiento interna */
.cards-container::-webkit-scrollbar {
    width: 6px;
}

.cards-container::-webkit-scrollbar-track {
    background: transparent;
}

.cards-container::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 10px;
}

.cards-container::-webkit-scrollbar-thumb:hover {
    background-color: var(--text-muted);
}

/* -------------------------------------------------------------
   4. TARJETA DE TAREA (CARDS)
   ------------------------------------------------------------- */
.task-card {
    /* Futuristic glass‑morphism with neon accent */
    background: linear-gradient(135deg, hsla(270, 90%, 55%, 0.1), hsla(200, 80%, 55%, 0.1)), var(--bg-card);
    border: 1px solid hsla(270, 90%, 55%, 0.4);
    border-radius: var(--border-radius-md);
    box-shadow: 0 0 10px hsla(270, 90%, 55%, 0.3), var(--shadow-sm);
    padding: 1.2rem;
    cursor: grab;
    position: relative;
    user-select: none;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast), opacity var(--transition-fast);
    color: var(--text-primary);
    font-size: 1rem;
    line-height: 1.6;
}

.task-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: hsl(220, 10%, 80%);
}

.task-card:active {
    cursor: grabbing;
}

.task-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.task-card h3 {
    font-size: 0.925rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
    word-break: break-word;
}

/* Botón Eliminar en la Tarjeta */
.btn-delete-task {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.2rem;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.6;
    transition: all var(--transition-fast);
}

.btn-delete-task:hover {
    background-color: hsl(0, 100%, 97%);
    color: hsl(0, 84%, 60%);
    opacity: 1;
    transform: scale(1.05);
}

.task-card p {
    font-size: 0.825rem;
    color: var(--text-secondary);
    line-height: 1.4;
    word-break: break-word;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.task-card-footer {
    margin-top: 1rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.task-date {
    font-size: 0.725rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* Estado al arrastrar */
.task-card.dragging {
    opacity: 0.45;
    transform: scale(0.96);
    cursor: grabbing;
    border: 2px dashed hsla(200, 90%, 55%, 0.8);
    box-shadow: 0 0 12px hsla(200, 90%, 55%, 0.6);
}

/* Estado de zona de soltado activo en columnas */
.cards-container.drop-zone-active {
    background-color: hsla(200, 80%, 20%, 0.4);
    outline: 2px dashed hsla(200, 90%, 55%, 0.8);
    outline-offset: -6px;
    box-shadow: 0 0 12px hsla(200, 90%, 55%, 0.6);
}

/* Animación al añadir */
@keyframes cardAppear {
    from {
        opacity: 0;
        transform: translateY(12px) scale(0.97);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.task-card-new {
    animation: cardAppear 0.35s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

/* Animación al eliminar */
.task-card-removing {
    opacity: 0 !important;
    transform: scale(0.9) !important;
    transition: opacity 0.25s ease, transform 0.25s ease !important;
}

/* Mensaje de columna vacía */
.empty-message {
    display: none;
}

/* -------------------------------------------------------------
   5. DIALOG / MODAL (CREACIÓN DE TAREAS)
   ------------------------------------------------------------- */


/* Estilo del fondo difuminado del modal */
.task-modal::backdrop {
    background-color: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(8px);
    transition: backdrop-filter 0.3s;
}

.task-modal {
    position: fixed;
    top: 10%;
    left: 20%;
    transform: translate(-50%, -30%);
    max-width: 500px;
    width: 90%;
    max-height: none;
    overflow: hidden;
    background: var(--bg-header);
    border: none;
    border-radius: var(--border-radius-lg);
    padding: 0;
    box-shadow: var(--shadow-lg);
    display: none;
    /* hidden by default */
}

/* When the dialog is opened (HTML <dialog open>) */
.task-modal[open] {
    display: flex;
    flex-direction: column;
}

/* When the dialog is opened (HTML <dialog open>) */
.task-modal[open] {
    display: flex;
    flex-direction: column;
}

.modal-content {
    display: flex;
    flex-direction: column;
    background-color: var(--bg-header);
    color: var(--text-primary);
    border-radius: var(--border-radius-md);
    padding: 1rem;
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--text-primary);
}

.btn-close-modal {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.25rem;
    border-radius: 50%;
    transition: all var(--transition-fast);
}

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

#task-form {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    position: relative;
}

.form-group label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-group input[type="text"],
.form-group textarea,
.form-group select {
    font-family: var(--font-family);
    font-size: 0.875rem;
    padding: 0.75rem;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
    outline: none;
    color: var(--text-primary);
    background-color: var(--bg-app);
    transition: all var(--transition-fast);
}

/* Placeholder styling for dark mode */
.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
    opacity: 0.8;
}

.form-group input[type="text"]:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: var(--pending-color);
    box-shadow: 0 0 0 3px hsla(224, 82%, 56%, 0.12);
}

.form-group textarea {
    resize: none;
}

/* Contador de caracteres */
.char-counter {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-align: right;
    margin-top: 0.1rem;
    font-weight: 500;
}

.error-msg {
    font-size: 0.725rem;
    color: hsl(0, 84%, 60%);
    display: none;
    font-weight: 500;
}

.form-group.has-error input {
    border-color: hsl(0, 84%, 60%);
}

.form-group.has-error .error-msg {
    display: block;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    margin-top: 0.75rem;
}

/* Animaciones del Modal */
.task-modal[open] {
    animation: modalShow 0.3s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes modalShow {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(8px);
    }

    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

/* -------------------------------------------------------------
   6. RESPONSIVE / DISEÑO ADAPTABLE
   ------------------------------------------------------------- */
@media (max-width: 1024px) {
    .app-header {
        grid-template-columns: 1fr 1fr;
    }

    .stats-panel {
        grid-column: 1 / -1;
        order: 3;
        margin: 0;
        width: 100%;
        justify-content: space-around;
    }
}

@media (max-width: 768px) {
    .app-container {
        padding: 1rem;
        gap: 1.5rem;
    }

    .app-header {
        grid-template-columns: 1fr;
        padding: 1.25rem 1.5rem;
        text-align: center;
        gap: 1.25rem;
    }

    .header-brand {
        flex-direction: column;
    }

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

    .header-actions .btn {
        flex-grow: 1;
    }

    .kanban-board {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }

    .kanban-column {
        max-height: none;
        min-height: 350px;
    }
}