/* ==============================================================
   BLIB - Stylesheet principale

   STRUTTURA DEL FILE (per modificare velocemente):
   1. TWEAK ZONE        → cambia qui tutti i colori/dimensioni
   2. Reset per i bui-* → evita ereditarietà strane
   3. Container & Element
   4. Tabella
   5. Button
   6. Form / Input / Checkbox / Select / Textarea
   7. Card
   8. Alert / Badge
   9. Modal
   10. Theme toggle
   11. Animazioni

   COME MODIFICARE I COLORI:
   - Cambia le variabili in :root (TWEAK ZONE) per il tema chiaro.
   - Cambia .bui-theme-dark per il tema scuro.
   - Tutti i componenti usano queste variabili: una sola modifica
     riapplica ovunque.
   ============================================================== */


/* ============= 1. TWEAK ZONE - modifica qui i colori ============= */

/* DEFAULT (tema chiaro) - applicati SEMPRE, anche fuori da UIContainer.
   Questo previene il bug "componente trasparente". */
:root,
.bui-theme-light {
    /* Sfondi */
    --bui-bg:        #f7f8fa;     /* sfondo "pagina" del container         */
    --bui-surface:   #ffffff;     /* sfondo card / element / input         */
    --bui-bg-strong: #eef2f7;     /* sfondo header tabella                 */

    /* Bordi */
    --bui-border:        #d1d5db; /* bordo standard (più visibile)         */
    --bui-border-strong: #9ca3af; /* bordo focus/hover                     */

    /* Testo */
    --bui-text:    #111827;       /* testo principale                      */
    --bui-text-soft: #374151;     /* testo secondario su surface           */
    --bui-muted:   #6b7280;       /* testo "muto" (hint, label, footer)    */

    /* Accenti */
    --bui-accent:        #2563eb; /* colore brand (button primary, link)   */
    --bui-accent-hover:  #1d4ed8;
    --bui-accent-fg:     #ffffff;

    /* Stati semantici */
    --bui-success: #16a34a;
    --bui-warning: #f59e0b;
    --bui-danger:  #dc2626;
    --bui-danger-hover: #b91c1c;

    /* Effetti */
    --bui-shadow:        0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --bui-shadow-strong: 0 6px 18px rgba(0,0,0,0.16);
    --bui-focus-ring:    0 0 0 3px rgba(37, 99, 235, 0.25);

    /* Tabella */
    --bui-row-alt: #f3f4f6;
    --bui-hover:   #eef4ff;

    /* Geometria */
    --bui-radius:      10px;
    --bui-radius-sm:   8px;
    --bui-font-size:   14px;
    --bui-font:        -apple-system, BlinkMacSystemFont, "Segoe UI",
                       Roboto, "Helvetica Neue", Arial, sans-serif;
}

/* TEMA SCURO - overrides */
.bui-theme-dark {
    --bui-bg:        #0f1115;
    --bui-surface:   #1b1e26;
    --bui-bg-strong: #232733;

    --bui-border:        #3a4150;
    --bui-border-strong: #5b6377;

    --bui-text:      #f3f4f6;
    --bui-text-soft: #d1d5db;
    --bui-muted:     #9ca3af;

    --bui-accent:       #60a5fa;
    --bui-accent-hover: #3b82f6;
    --bui-accent-fg:    #0b1120;

    --bui-success: #22c55e;
    --bui-warning: #fbbf24;
    --bui-danger:  #ef4444;
    --bui-danger-hover: #dc2626;

    --bui-shadow:        0 2px 6px rgba(0,0,0,0.5);
    --bui-shadow-strong: 0 6px 24px rgba(0,0,0,0.6);
    --bui-focus-ring:    0 0 0 3px rgba(96, 165, 250, 0.35);

    --bui-row-alt: #20242f;
    --bui-hover:   #2a3142;
}


/* ============= 2. Reset / Base ============= */

/* Tutti i nostri componenti hanno SEMPRE background, colore testo e font
   forzati: niente più trasparenze accidentali quando il parent è scuro. */
.bui-container,
.bui-element,
.bui-card,
.bui-table-wrapper,
.bui-input,
.bui-btn,
.bui-modal,
.bui-alert,
.bui-toolbar,
.bui-pagination {
    color: var(--bui-text);
    font-family: var(--bui-font);
    font-size: var(--bui-font-size);
    box-sizing: border-box;
}

.bui-container *, .bui-element *, .bui-card *, .bui-modal * {
    box-sizing: border-box;
}


/* ============= 3. Container & Element (per drag layout) ============= */

.bui-container {
    background: var(--bui-bg);
    border: 1px solid var(--bui-border);
    border-radius: 12px;
    overflow: hidden;
}

.bui-toolbar {
    position: absolute;
    top: 8px;
    right: 8px;
    background: var(--bui-surface);
    border: 1px solid var(--bui-border);
    border-radius: 8px;
    padding: 4px 8px;
    display: flex;
    gap: 8px;
    align-items: center;
    box-shadow: var(--bui-shadow);
    font-size: 12px;
    z-index: 9999;
}
.bui-toolbar button {
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--bui-text);
    font-size: 16px;
    line-height: 1;
}
.bui-tag {
    background: var(--bui-accent);
    color: var(--bui-accent-fg);
    padding: 2px 8px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 11px;
}

.bui-element {
    background: var(--bui-surface);
    border: 1px solid var(--bui-border);
    border-radius: var(--bui-radius);
    box-shadow: var(--bui-shadow);
    user-select: none;
    -webkit-user-select: none;
    touch-action: none;
    overflow: hidden;
    cursor: grab;
    transition: box-shadow 120ms ease, transform 80ms ease, border-color 120ms ease;
    display: flex;
    flex-direction: column;
}
.bui-element:hover {
    box-shadow: var(--bui-shadow-strong);
    border-color: var(--bui-border-strong);
}
.bui-element.bui-dragging {
    cursor: grabbing;
    box-shadow: var(--bui-shadow-strong);
    transform: scale(1.01);
    z-index: 1000 !important;
}
.bui-element-header {
    padding: 6px 10px;
    background: var(--bui-accent);
    color: var(--bui-accent-fg);
    font-weight: 600;
    font-size: 13px;
    flex-shrink: 0;
}
.bui-element-body {
    padding: 10px;
    flex: 1 1 auto;
    overflow: auto;
    color: var(--bui-text);
    line-height: 1.4;
}


/* ============= 4. Tabella ============= */

.bui-table-wrapper {
    background: var(--bui-surface);
    border: 1px solid var(--bui-border);
    border-radius: var(--bui-radius);
    overflow: hidden;
    box-shadow: var(--bui-shadow);
}
.bui-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--bui-font-size);
    color: var(--bui-text);
}
.bui-table thead th {
    background: var(--bui-bg-strong);
    color: var(--bui-text-soft);
    text-align: left;
    padding: 10px 12px;
    font-weight: 700;
    text-transform: uppercase;
    font-size: 11px;
    letter-spacing: 0.04em;
    border-bottom: 1px solid var(--bui-border);
}
.bui-table th.bui-sortable { cursor: pointer; user-select: none; }
.bui-table th.bui-sortable:hover { background: var(--bui-hover); }
.bui-table tbody tr { background: var(--bui-surface); }
.bui-table tbody tr:nth-child(even) { background: var(--bui-row-alt); }
.bui-table tbody tr:hover { background: var(--bui-hover); }
.bui-table td {
    padding: 8px 12px;
    border-bottom: 1px solid var(--bui-border);
    color: var(--bui-text);
}
.bui-table .bui-idx-col {
    width: 48px;
    color: var(--bui-muted);
    font-variant-numeric: tabular-nums;
    text-align: right;
}
.bui-sort-arrow { margin-left: 4px; font-size: 10px; color: var(--bui-accent); }
.bui-empty {
    text-align: center;
    color: var(--bui-muted);
    padding: 24px;
    font-style: italic;
}
.bui-pagination {
    padding: 8px 12px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
    background: var(--bui-bg-strong);
    border-top: 1px solid var(--bui-border);
    font-size: 12px;
    color: var(--bui-text-soft);
}
.bui-pagination button {
    background: var(--bui-surface);
    border: 1px solid var(--bui-border);
    color: var(--bui-text);
    padding: 4px 10px;
    border-radius: 6px;
    cursor: pointer;
}
.bui-pagination button:disabled { opacity: 0.4; cursor: not-allowed; }


/* ============= 5. Button ============= */

.bui-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--bui-radius-sm);
    font-weight: 600;
    font-size: var(--bui-font-size);
    border: 1px solid transparent;
    cursor: pointer;
    transition: background 120ms ease, transform 80ms ease, box-shadow 120ms ease, border-color 120ms ease;
    line-height: 1.2;
    min-height: 36px;
    white-space: nowrap;
}
.bui-btn:active:not(:disabled) { transform: translateY(1px); }
.bui-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.bui-btn:focus-visible { outline: none; box-shadow: var(--bui-focus-ring); }
.bui-btn-block { width: 100%; }

.bui-btn-primary   { background: var(--bui-accent);  color: var(--bui-accent-fg); border-color: var(--bui-accent); }
.bui-btn-primary:hover:not(:disabled)   { background: var(--bui-accent-hover); border-color: var(--bui-accent-hover); }

.bui-btn-secondary { background: var(--bui-bg-strong); color: var(--bui-text); border-color: var(--bui-border); }
.bui-btn-secondary:hover:not(:disabled) { background: var(--bui-hover); border-color: var(--bui-border-strong); }

.bui-btn-success   { background: var(--bui-success); color: #fff; border-color: var(--bui-success); }
.bui-btn-success:hover:not(:disabled)   { filter: brightness(0.92); }

.bui-btn-danger    { background: var(--bui-danger);  color: #fff; border-color: var(--bui-danger); }
.bui-btn-danger:hover:not(:disabled)    { background: var(--bui-danger-hover); border-color: var(--bui-danger-hover); }

.bui-btn-ghost     { background: transparent; color: var(--bui-text); border-color: var(--bui-border); }
.bui-btn-ghost:hover:not(:disabled)     { background: var(--bui-hover); border-color: var(--bui-border-strong); }

/* spinner inline (loading) */
.bui-spinner {
    width: 14px; height: 14px; border-radius: 50%;
    border: 2px solid currentColor; border-top-color: transparent;
    animation: bui-spin 700ms linear infinite;
    flex-shrink: 0;
}
@keyframes bui-spin { to { transform: rotate(360deg); } }


/* ============= 6. Form / Input / Checkbox / Select / Textarea ============= */

.bui-form { display: flex; flex-direction: column; gap: 14px; }
.bui-form-group { display: flex; flex-direction: column; gap: 4px; }

.bui-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--bui-text);
    margin-bottom: 2px;
}
.bui-required { color: var(--bui-danger); margin-left: 2px; }

.bui-input {
    padding: 9px 12px;
    border: 1px solid var(--bui-border);
    border-radius: var(--bui-radius-sm);
    font-size: var(--bui-font-size);
    background: var(--bui-surface);   /* NESSUNA TRASPARENZA */
    color: var(--bui-text);
    font-family: inherit;
    transition: border-color 120ms ease, box-shadow 120ms ease;
    outline: none;
    width: 100%;
    min-height: 38px;
}
.bui-input::placeholder { color: var(--bui-muted); opacity: 1; }
.bui-input:hover { border-color: var(--bui-border-strong); }
.bui-input:focus {
    border-color: var(--bui-accent);
    box-shadow: var(--bui-focus-ring);
}
.bui-input:disabled {
    background: var(--bui-bg-strong);
    color: var(--bui-muted);
    cursor: not-allowed;
}
.bui-input-error { border-color: var(--bui-danger); }
.bui-input-error:focus { box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.25); }

.bui-textarea { resize: vertical; min-height: 80px; line-height: 1.4; }

.bui-hint  { color: var(--bui-muted);  font-size: 12px; }
.bui-error { color: var(--bui-danger); font-size: 12px; font-weight: 600; }

/* Checkbox custom (mantenendo accessibilità) */
.bui-checkbox {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    user-select: none;
    font-size: var(--bui-font-size);
    color: var(--bui-text);
    padding: 4px 0;
}
.bui-checkbox input { position: absolute; opacity: 0; pointer-events: none; }
.bui-checkbox-mark {
    width: 18px; height: 18px;
    border: 2px solid var(--bui-border-strong);
    border-radius: 4px;
    background: var(--bui-surface);
    position: relative;
    transition: all 120ms ease;
    flex-shrink: 0;
}
.bui-checkbox:hover .bui-checkbox-mark { border-color: var(--bui-accent); }
.bui-checkbox input:checked + .bui-checkbox-mark {
    background: var(--bui-accent);
    border-color: var(--bui-accent);
}
.bui-checkbox input:checked + .bui-checkbox-mark::after {
    content: '✓';
    color: var(--bui-accent-fg);
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -55%);
    font-size: 13px;
    font-weight: 700;
    line-height: 1;
}
.bui-checkbox input:focus-visible + .bui-checkbox-mark { box-shadow: var(--bui-focus-ring); }


/* ============= 7. Card ============= */

.bui-card {
    background: var(--bui-surface);
    border: 1px solid var(--bui-border);
    border-radius: 12px;
    box-shadow: var(--bui-shadow);
    overflow: hidden;
    color: var(--bui-text);
}
.bui-card-header {
    padding: 14px 18px;
    border-bottom: 1px solid var(--bui-border);
    background: var(--bui-bg-strong);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}
.bui-card-title { margin: 0; font-size: 16px; font-weight: 700; color: var(--bui-text); }
.bui-card-subtitle { color: var(--bui-muted); font-size: 12px; margin-top: 2px; }
.bui-card-actions { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.bui-card-body { padding: 18px; color: var(--bui-text); }
.bui-card-footer {
    padding: 12px 18px;
    border-top: 1px solid var(--bui-border);
    background: var(--bui-bg-strong);
    display: flex;
    gap: 8px;
    justify-content: flex-end;
}


/* ============= 8. Alert / Badge ============= */

.bui-alert {
    display: flex;
    gap: 12px;
    padding: 12px 14px;
    border-radius: var(--bui-radius);
    border-left: 4px solid;
    font-size: var(--bui-font-size);
    align-items: flex-start;
}
.bui-alert-icon {
    width: 22px; height: 22px;
    display: inline-flex; align-items: center; justify-content: center;
    border-radius: 50%;
    font-weight: 700;
    flex-shrink: 0;
    color: #fff;
}
.bui-alert-content { flex: 1; }
.bui-alert-title { font-weight: 700; margin-bottom: 2px; }
.bui-alert-close {
    background: none; border: none; cursor: pointer;
    font-size: 22px; line-height: 1; color: inherit; padding: 0 4px;
}
.bui-alert-info    { background: #dbeafe; color: #1e3a8a; border-color: #2563eb; }
.bui-alert-info    .bui-alert-icon { background: #2563eb; }
.bui-alert-success { background: #d1fae5; color: #065f46; border-color: #16a34a; }
.bui-alert-success .bui-alert-icon { background: #16a34a; }
.bui-alert-warning { background: #fef3c7; color: #78350f; border-color: #d97706; }
.bui-alert-warning .bui-alert-icon { background: #d97706; }
.bui-alert-error   { background: #fee2e2; color: #7f1d1d; border-color: #dc2626; }
.bui-alert-error   .bui-alert-icon { background: #dc2626; }

.bui-theme-dark .bui-alert-info    { background: #1e3a8a55; color: #bfdbfe; }
.bui-theme-dark .bui-alert-success { background: #06463455; color: #a7f3d0; }
.bui-theme-dark .bui-alert-warning { background: #78350f55; color: #fde68a; }
.bui-theme-dark .bui-alert-error   { background: #7f1d1d55; color: #fecaca; }

.bui-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    line-height: 1.4;
}
.bui-badge-blue   { background: #dbeafe; color: #1d4ed8; }
.bui-badge-green  { background: #d1fae5; color: #047857; }
.bui-badge-orange { background: #fed7aa; color: #c2410c; }
.bui-badge-red    { background: #fee2e2; color: #b91c1c; }
.bui-badge-purple { background: #ede9fe; color: #6d28d9; }
.bui-badge-gray   { background: #e5e7eb; color: #374151; }

.bui-theme-dark .bui-badge-blue   { background: #1e3a8a; color: #bfdbfe; }
.bui-theme-dark .bui-badge-green  { background: #064e3b; color: #a7f3d0; }
.bui-theme-dark .bui-badge-orange { background: #7c2d12; color: #fed7aa; }
.bui-theme-dark .bui-badge-red    { background: #7f1d1d; color: #fecaca; }
.bui-theme-dark .bui-badge-purple { background: #4c1d95; color: #ddd6fe; }
.bui-theme-dark .bui-badge-gray   { background: #374151; color: #e5e7eb; }


/* ============= 9. Modal ============= */

.bui-modal-backdrop {
    position: fixed; inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex; align-items: center; justify-content: center;
    z-index: 9000;
    animation: bui-fade-in 150ms ease;
    padding: 16px;
}
.bui-modal {
    background: var(--bui-surface);  /* NESSUNA TRASPARENZA */
    color: var(--bui-text);
    border: 1px solid var(--bui-border);
    border-radius: 14px;
    box-shadow: var(--bui-shadow-strong);
    width: min(90vw, 480px);
    max-height: 90vh;
    overflow: auto;
    display: flex;
    flex-direction: column;
}
.bui-modal-header {
    padding: 14px 18px;
    background: var(--bui-bg-strong);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--bui-border);
}
.bui-modal-header h3 { margin: 0; font-size: 16px; font-weight: 700; color: var(--bui-text); }
.bui-modal-close {
    background: none; border: none; cursor: pointer;
    font-size: 22px; color: var(--bui-muted); line-height: 1;
}
.bui-modal-close:hover { color: var(--bui-text); }
.bui-modal-body { padding: 18px; flex: 1; color: var(--bui-text); }
.bui-modal-footer {
    padding: 12px 18px;
    border-top: 1px solid var(--bui-border);
    background: var(--bui-bg-strong);
    display: flex;
    gap: 8px;
    justify-content: flex-end;
}


/* ============= 10. Theme toggle ============= */

.bui-theme-toggle {
    background: var(--bui-surface);
    color: var(--bui-text);
    border: 1px solid var(--bui-border);
    border-radius: var(--bui-radius-sm);
    padding: 6px 12px;
    cursor: pointer;
    font-size: 13px;
    font-family: var(--bui-font);
}
.bui-theme-toggle:hover { background: var(--bui-hover); border-color: var(--bui-border-strong); }


/* ============= 11. Animazioni ============= */

@keyframes bui-fade-in {
    from { opacity: 0; transform: translateY(4px); }
    to   { opacity: 1; transform: translateY(0);   }
}
.bui-element { animation: bui-fade-in 200ms ease-out; }