/* BillMint Studio — three-pane workspace on app.css tokens.
   Left: template picker · Center: dynamic form · Right: live A4 preview. */

.studio-body { display: flex; flex-direction: column; min-height: 100vh; }

.studio {
  display: grid;
  grid-template-columns: 264px minmax(0, 1fr) minmax(0, 1.15fr);
  gap: 18px;
  align-items: start;
  width: 100%;
  max-width: 1440px;
  padding-block: 20px;
  flex: 1;
}

.pane-title { font-size: 1.02rem; margin: 0; letter-spacing: -.01em; }
.pane-sub { font-size: .84rem; color: var(--text-mut); margin: 3px 0 0; }

.btn-sm { padding: 8px 14px; font-size: .85rem; border-radius: 9px; }

/* ============ Picker ============ */
.pane-picker {
  position: sticky; top: 78px;
  max-height: calc(100vh - 98px);
  display: flex; flex-direction: column;
  overflow: hidden;
}
.picker-head { padding: 16px 14px 12px; border-bottom: 1px solid var(--border-soft); }
.picker-head .pane-title { margin-bottom: 10px; }
.picker-list { overflow-y: auto; padding: 10px 10px 14px; scrollbar-width: thin; }
.picker-loading, .picker-empty, .picker-error { font-size: .86rem; color: var(--text-mut); padding: 8px 6px; }
.picker-error { color: var(--danger); }

.tpl-group { margin-bottom: 6px; }
.tpl-cat {
  font-size: .68rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase;
  color: var(--text-mut); margin: 12px 6px 6px;
}
.tpl-items { list-style: none; margin: 0; padding: 0; }
.tpl-btn {
  display: flex; align-items: flex-start; gap: 10px; width: 100%; text-align: left;
  font-family: inherit; cursor: pointer;
  background: transparent; border: 1px solid transparent; border-radius: 10px;
  padding: 9px 10px; margin-bottom: 2px;
  color: var(--text); transition: background .12s ease, border-color .12s ease;
}
.tpl-btn:hover { background: var(--bg-elev2); }
.tpl-btn.active { background: color-mix(in srgb, var(--brand) 13%, transparent); border-color: color-mix(in srgb, var(--brand) 40%, transparent); }
.tpl-icon { font-size: 18px; line-height: 1.3; }
.tpl-meta { display: flex; flex-direction: column; min-width: 0; }
.tpl-name { font-size: .88rem; font-weight: 600; }
.tpl-desc {
  font-size: .74rem; color: var(--text-dim);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 180px;
}

/* ============ Form pane ============ */
.pane-form { padding: 18px 18px 16px; }
.form-head {
  display: flex; justify-content: space-between; align-items: flex-start; gap: 12px;
  padding-bottom: 14px; margin-bottom: 16px; border-bottom: 1px solid var(--border-soft);
  flex-wrap: wrap;
}
.form-head h1 { font-size: 1.15rem; }
.form-actions { display: flex; gap: 8px; flex-shrink: 0; }
.doc-form .field { margin-bottom: 13px; }
.req { color: var(--danger); }

.field-check .check-label {
  display: flex; align-items: center; gap: 10px; cursor: pointer;
  font-size: .9rem; font-weight: 500; color: var(--text);
}
.field-check input[type="checkbox"] {
  width: 18px; height: 18px; accent-color: var(--brand); cursor: pointer; flex-shrink: 0;
}

.pro-note {
  margin: 16px 0 0; padding: 10px 14px; border-radius: 10px;
  font-size: .8rem; color: var(--text-dim);
  background: color-mix(in srgb, var(--warn) 9%, transparent);
  border: 1px dashed color-mix(in srgb, var(--warn) 45%, transparent);
}

/* ---- items editor ---- */
.items-editor { border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 10px; background: var(--bg-elev); }
.item-head, .item-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 62px 92px 92px 30px;
  gap: 8px; align-items: center;
}
.item-head {
  font-size: .68rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
  color: var(--text-mut); padding: 0 2px 6px;
}
.item-head span { min-width: 0; overflow: hidden; white-space: nowrap; }
.item-row { margin-bottom: 8px; }
.item-row input { padding: 8px 10px; font-size: .88rem; background: var(--bg-elev2); }
.it-amt {
  font-size: .82rem; font-weight: 600; text-align: right;
  font-variant-numeric: tabular-nums; color: var(--text-dim);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.it-del {
  width: 28px; height: 28px; border-radius: 8px; border: 1px solid transparent;
  background: transparent; color: var(--text-mut); font-size: 13px; cursor: pointer;
  display: grid; place-items: center;
}
.it-del:hover { color: var(--danger); border-color: var(--danger); background: color-mix(in srgb, var(--danger) 8%, transparent); }
.btn-add-item { margin-top: 4px; padding: 8px 14px; font-size: .84rem; }

/* ============ Preview pane ============ */
.pane-preview {
  position: sticky; top: 78px;
  display: flex; flex-direction: column; gap: 12px;
  max-height: calc(100vh - 98px);
}
.preview-bar {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  padding: 10px 14px; flex-wrap: wrap;
}
.preview-label { display: inline-flex; align-items: center; gap: 8px; font-size: .85rem; font-weight: 700; color: var(--text-dim); }
.live-dot {
  width: 8px; height: 8px; border-radius: 50%; background: var(--ok);
  box-shadow: 0 0 0 0 color-mix(in srgb, var(--ok) 55%, transparent);
  animation: pulse 2.2s ease-out infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--ok) 55%, transparent); }
  70% { box-shadow: 0 0 0 8px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}
@media (prefers-reduced-motion: reduce) { .live-dot { animation: none; } }
.preview-actions { display: flex; gap: 8px; }

.preview-stage {
  flex: 1; min-height: 480px; overflow: auto;
  border: 1px solid var(--border); border-radius: var(--radius);
  background:
    linear-gradient(color-mix(in srgb, var(--border-soft) 60%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--border-soft) 60%, transparent) 1px, transparent 1px),
    var(--bg-elev);
  background-size: 24px 24px, 24px 24px, auto;
  padding: 18px; display: grid; place-items: start center;
}
.preview-frame {
  width: 100%; max-width: 820px; min-height: 1000px;
  background: #fff; border: 0; border-radius: 6px;
  box-shadow: 0 18px 50px -18px rgba(0, 0, 0, .55);
}
.preview-empty {
  align-self: center; max-width: 30rem; text-align: center;
  color: var(--text-mut); font-size: .93rem; padding: 40px 16px;
}

.studio-ftr { margin-top: 40px; }

/* ============ Responsive ============ */
@media (max-width: 1120px) {
  .studio { grid-template-columns: 232px minmax(0, 1fr); }
  .pane-preview { grid-column: 1 / -1; position: static; max-height: none; }
  .preview-frame { min-height: 780px; }
}
@media (max-width: 760px) {
  .studio { grid-template-columns: 1fr; padding-block: 14px; }
  .pane-picker { position: static; max-height: 320px; }
  .pane-preview { position: static; }
  .preview-stage { padding: 10px; min-height: 360px; }
  .preview-frame { min-height: 620px; }
  .item-head { display: none; }
  .item-row { grid-template-columns: minmax(0, 1fr) 56px 80px 28px; }
  .it-amt { display: none; }
}