/* Página del mazo: biblioteca lateral + zona de estudio */

.deck-header {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
    margin: 8px 0 24px;
}

.deck-header h1 {
    margin: 0;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(2rem, 4vw, 2.75rem);
    letter-spacing: -0.02em;
}

.deck-user {
    min-height: 1.5em;
    margin: 2px 0 0;
    color: var(--text-muted);
    font-weight: 600;
}

.deck-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.deck-layout {
    display: grid;
    grid-template-columns: 280px minmax(0, 1fr);
    align-items: start;
    gap: 28px;
}

/* ---------- Biblioteca ---------- */

.library {
    position: sticky;
    top: calc(var(--nav-h) + 16px);
    max-height: calc(100vh - var(--nav-h) - 32px);
    overflow-y: auto;
    padding: 18px 14px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--surface);
    box-shadow: var(--shadow-sm);
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}

.library-toggle-btn {
    display: none;
}

.library-title {
    margin: 0 0 8px;
    padding-inline: 8px;
    color: var(--text-muted);
    font-family: var(--font-sans);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.category-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
    margin-bottom: 22px;
}

.category-btn {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    width: 100%;
    padding: 9px 10px;
    border: 0;
    border-radius: 10px;
    background: transparent;
    color: var(--text);
    font-weight: 700;
    text-align: left;
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
}

.category-btn:hover {
    background: var(--surface-2);
}

.category-btn.is-active {
    background: var(--primary-soft);
    color: var(--primary-text);
}

.category-count {
    flex-shrink: 0;
    min-width: 28px;
    padding: 1px 8px;
    border-radius: 999px;
    background: var(--surface-2);
    color: var(--text-muted);
    font-size: 0.78rem;
    font-weight: 800;
    text-align: center;
    transition: background-color 0.2s, color 0.2s;
}

.category-btn.is-active .category-count {
    background: var(--primary);
    color: var(--primary-contrast);
}

.word-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.word-item {
    padding: 7px 10px;
    border-radius: 8px;
    color: var(--text);
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
}

.word-item:hover {
    background: var(--surface-2);
    color: var(--primary-text);
}

/* Punto de color con el nivel de dominio de cada palabra */
.word-item[data-level] {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.word-item[data-level]::after {
    content: "";
    flex-shrink: 0;
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.word-item[data-level="weak"]::after { background: var(--danger); }
.word-item[data-level="learning"]::after { background: #f0a020; }
.word-item[data-level="mastered"]::after { background: var(--success); }

/* ---------- Zona de estudio ---------- */

.study {
    --deck-w: 560px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
}

.study-top,
.progress,
.deck-card,
.navigation-buttons {
    width: min(100%, var(--deck-w));
}

.study-top {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 12px;
}

.study-info {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.study-category {
    overflow: hidden;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.45rem;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.study-count {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.progress {
    height: 8px;
    overflow: hidden;
    border-radius: 999px;
    background: var(--surface-2);
}

.progress-fill {
    width: 0;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, var(--primary), #7aa3ff);
    transition: width 0.4s var(--ease);
}

/* Tarjeta giratoria (se puede deslizar a los lados) */
.deck-card {
    --swipe: 0;
    position: relative;
    height: 320px;
    margin-top: 6px;
    perspective: 1400px;
    touch-action: pan-y; /* el desplazamiento vertical sigue funcionando en el móvil */
    user-select: none;
    -webkit-user-select: none;
    transition: transform 0.26s var(--ease), opacity 0.26s;
}

.deck-card.is-dragging,
.deck-card.no-transition {
    transition: none;
}

.deck-card.is-leaving {
    opacity: 0;
}

.deck-card.is-entering {
    animation: card-enter 0.32s var(--ease);
}

@keyframes card-enter {
    from {
        opacity: 0;
        transform: scale(0.93);
    }
}

/* Etiquetas que aparecen al deslizar */
.swipe-badge {
    position: absolute;
    top: 18px;
    z-index: 2;
    padding: 6px 14px;
    border-radius: 10px;
    border: 3px solid currentColor;
    background: var(--surface);
    font-weight: 800;
    font-size: 1.05rem;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    pointer-events: none;
}

.swipe-badge--yes {
    left: 18px;
    color: var(--success);
    rotate: -10deg;
    opacity: max(0, var(--swipe));
}

.swipe-badge--no {
    right: 18px;
    color: var(--danger);
    rotate: 10deg;
    opacity: max(0, calc(var(--swipe) * -1));
}

.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
    /* Simétrica: a los 250 ms (mitad del giro) la tarjeta está de canto y se cambia el texto */
    transition: transform 0.5s ease-in-out;
    cursor: pointer;
}

.card-inner.flipped {
    transform: rotateY(180deg);
}

.card-inner.no-transition {
    transition: none;
}

.card-front,
.card-back {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 44px 32px;
    overflow: hidden;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    text-align: center;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}

.card-front {
    border: 1px solid var(--border);
    background: var(--surface);
}

.card-front::before {
    content: "";
    position: absolute;
    inset: 0 0 auto;
    height: 6px;
    background: linear-gradient(90deg, var(--primary), color-mix(in srgb, var(--rouge) 70%, var(--primary)));
}

.card-back {
    transform: rotateY(180deg);
    background: linear-gradient(150deg, #3d70ee, #1f45b0);
    color: #ffffff;
}

.card-text {
    margin: 0;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(1.8rem, 5vw, 2.6rem);
    line-height: 1.15;
    overflow-wrap: anywhere;
}

.card-top {
    position: absolute;
    top: 20px;
    left: 22px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.card-lang {
    color: var(--text-muted);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.card-back .card-lang {
    color: rgba(255, 255, 255, 0.75);
}

/* Nivel de dominio: 5 puntos */
.card-mastery {
    display: flex;
    gap: 3px;
}

.card-mastery i {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--border);
}

.card-mastery i.on {
    background: var(--success);
}

.card-mastery.is-weak i.on {
    background: var(--danger);
}

.card-mastery.is-learning i.on {
    background: #f0a020;
}

/* Botón de escuchar: solo en la cara que está en el idioma que se aprende */
.card-speak {
    position: absolute;
    top: 14px;
    right: 16px;
}

.card-inner[data-speak-side="front"] .card-back .card-speak,
.card-inner[data-speak-side="back"] .card-front .card-speak {
    display: none;
}

/* Autoevaluación: visible (sin mover el resto) cuando la tarjeta está girada */
.grade-buttons {
    width: min(100%, var(--deck-w));
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-6px);
    transition: opacity 0.25s, transform 0.25s var(--ease);
}

.study:has(.card-inner.flipped) .grade-buttons {
    opacity: 1;
    pointer-events: auto;
    transform: none;
}

.grade-btn--no {
    background: color-mix(in srgb, var(--danger) 12%, var(--surface));
    color: color-mix(in srgb, var(--danger) 80%, var(--text));
    border-color: color-mix(in srgb, var(--danger) 35%, var(--border));
}

.grade-btn--no:hover {
    background: color-mix(in srgb, var(--danger) 20%, var(--surface));
}

.grade-btn--yes {
    background: color-mix(in srgb, var(--success) 12%, var(--surface));
    color: color-mix(in srgb, var(--success) 75%, var(--text));
    border-color: color-mix(in srgb, var(--success) 35%, var(--border));
}

.grade-btn--yes:hover {
    background: color-mix(in srgb, var(--success) 20%, var(--surface));
}

.card-hint {
    position: absolute;
    bottom: 16px;
    color: var(--text-muted);
    font-size: 0.8rem;
    font-weight: 600;
    opacity: 0.8;
}

.navigation-buttons {
    display: flex;
    gap: 10px;
    margin-top: 6px;
}

.navigation-buttons .btn {
    flex: 1;
    padding-inline: 12px;
}

.hint {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.9rem;
    text-align: center;
}

/* Pista de teclado en ordenador, de gestos en pantallas táctiles */
.hint--touch { display: none; }

@media (hover: none) {
    .hint--keys { display: none; }
    .hint--touch { display: block; }
}

/* ---------- Modales propios del mazo ---------- */

.confirm-translation {
    margin: 0 0 14px;
    color: var(--primary-text);
    font-family: var(--font-display);
    font-style: italic;
    font-size: 1.15rem;
}

.move-options {
    margin-top: 18px;
    padding-top: 18px;
    border-top: 1px solid var(--border);
}

.move-options .btn {
    width: 100%;
}

.import-modal-content {
    width: min(100%, 540px);
}

.format-hint {
    margin-bottom: 16px;
    padding: 12px 14px;
    border-radius: 12px;
    background: var(--surface-2);
    font-size: 0.85rem;
}

.format-hint p {
    margin: 0;
}

.format-hint p + p {
    margin-top: 6px;
}

.format-hint code {
    padding: 1px 6px;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: var(--surface);
    font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
    font-size: 0.85em;
    word-break: break-all;
}

#import-file {
    width: 100%;
    padding: 14px;
    border-radius: 12px;
    border: 2px dashed var(--border);
    background: var(--surface-2);
    color: var(--text-muted);
    cursor: pointer;
}

#import-file::file-selector-button {
    margin-right: 12px;
    padding: 8px 14px;
    border: 0;
    border-radius: 10px;
    background: var(--primary);
    color: var(--primary-contrast);
    font: inherit;
    font-weight: 800;
    cursor: pointer;
}

.import-count {
    margin: 16px 0 8px;
}

#preview-table-container {
    max-height: 220px;
    overflow-y: auto;
    border-radius: 12px;
    border: 1px solid var(--border);
}

#preview-table-container table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

#preview-table-container th,
#preview-table-container td {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
    text-align: left;
}

#preview-table-container th {
    position: sticky;
    top: 0;
    background: var(--surface-2);
    color: var(--text-muted);
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

#preview-table-container .import-hint {
    margin: 0;
    padding: 8px 12px;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* El login deja visible la barra de navegación para poder ir a otras secciones */
.login-modal {
    top: var(--nav-h);
    z-index: 90;
}

.login-modal-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.login-mark {
    width: 56px;
    height: 56px;
    margin-bottom: 14px;
    border-radius: 16px;
    background: linear-gradient(90deg, #2a5bd7 0 33.4%, #ffffff 33.4% 66.6%, #e5484d 66.6%);
    box-shadow: inset 0 0 0 1px rgba(14, 27, 54, 0.12), var(--shadow);
}

/* ---------- Móvil ---------- */

@media (max-width: 860px) {
    .deck-layout {
        grid-template-columns: minmax(0, 1fr);
        gap: 18px;
    }

    .library {
        position: static;
        max-height: none;
        padding: 6px;
    }

    .library-toggle-btn {
        display: flex;
        align-items: center;
        justify-content: space-between;
        width: 100%;
        padding: 10px 12px;
        border: 0;
        border-radius: 10px;
        background: transparent;
        font-weight: 800;
        cursor: pointer;
    }

    .library-toggle-btn:hover {
        background: var(--surface-2);
    }

    .library-content {
        display: none;
        padding: 12px 8px 8px;
    }

    .library-content.open {
        display: block;
    }

    .word-list {
        max-height: 280px;
        overflow-y: auto;
    }
}

@media (max-width: 480px) {
    .deck-actions {
        width: 100%;
    }

    .deck-actions #import-btn,
    .deck-actions #add-card-btn {
        flex: 1;
    }

    .deck-card {
        height: 260px;
    }

    .card-front,
    .card-back {
        padding: 40px 20px;
    }
}