/* Reusable UI components */

/* ── Drop zones ── */
.drop-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--sp-1);
  margin: var(--sp-2) var(--sp-3);
  padding: var(--sp-3) var(--sp-2);
  border: 1.5px dashed var(--border-focus);
  border-radius: var(--r-m);
  background: var(--surface);
  color: var(--text-2);
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease),
              border-color var(--dur-fast) var(--ease),
              color var(--dur-fast) var(--ease);
  text-align: center;
  min-height: 72px;
}

.drop-zone:hover,
.drop-zone.drag-over {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent-light);
}

.drop-zone svg { opacity: 0.6; flex-shrink: 0; }
.drop-zone:hover svg, .drop-zone.drag-over svg { opacity: 1; }

.drop-zone-label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: inherit;
}

.drop-zone-hint {
  font-size: 11px;
  color: var(--text-3);
}

/* Hide the actual file input but keep it accessible */
#input-pdfs,
#input-stamp {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 5px var(--sp-3);
  border-radius: var(--r-s);
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text-1);
  font-family: var(--font-ui);
  font-size: var(--text-base);
  font-weight: 500;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease),
              border-color var(--dur-fast) var(--ease);
  white-space: nowrap;
  user-select: none;
}

.btn:hover { background: var(--card-hover); border-color: var(--border-focus); }
.btn:active { opacity: 0.85; }
.btn:disabled { opacity: 0.38; cursor: not-allowed; pointer-events: none; }

.btn-primary {
  background: var(--accent);
  border-color: transparent;
  color: #fff;
}
.btn-primary:hover { background: #4492f0; border-color: transparent; }

.btn-icon {
  padding: 5px;
  border-radius: var(--r-s);
  min-width: 28px;
  justify-content: center;
}

.btn-ghost {
  background: transparent;
  border-color: transparent;
  color: var(--text-2);
}
.btn-ghost:hover { background: rgba(255,255,255,0.07); color: var(--text-1); }

/* ── Range sliders ── */
.slider-row {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-1) var(--sp-3);
}

.slider-label {
  font-size: var(--text-sm);
  color: var(--text-2);
  width: 52px;
  flex-shrink: 0;
}

.slider-val {
  font-size: var(--text-sm);
  color: var(--text-2);
  font-variant-numeric: tabular-nums;
  width: 34px;
  text-align: right;
  flex-shrink: 0;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  flex: 1;
  height: 4px;
  border-radius: 2px;
  background: var(--border-focus);
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--sidebar-bg);
  box-shadow: 0 0 0 1px var(--accent);
  transition: box-shadow var(--dur-fast) var(--ease);
}

input[type="range"]:hover::-webkit-slider-thumb {
  box-shadow: 0 0 0 3px var(--accent-dim);
}

/* ── Checkboxes ── */
input[type="checkbox"] {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border: 1.5px solid var(--border-focus);
  border-radius: var(--r-xs);
  background: transparent;
  cursor: pointer;
  flex-shrink: 0;
  position: relative;
  transition: background var(--dur-fast), border-color var(--dur-fast);
}

input[type="checkbox"]:checked {
  background: var(--accent);
  border-color: var(--accent);
}

input[type="checkbox"]:checked::after {
  content: '';
  position: absolute;
  left: 3px; top: 1px;
  width: 5px; height: 8px;
  border: 2px solid #fff;
  border-top: none;
  border-left: none;
  transform: rotate(45deg);
}

/* ── Text input ── */
.text-input {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-s);
  color: var(--text-1);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  padding: 4px var(--sp-2);
  outline: none;
  width: 100%;
  transition: border-color var(--dur-fast);
}
.text-input:focus { border-color: var(--accent); }
.text-input::placeholder { color: var(--text-3); }

/* ── File rows ── */
.file-row {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-1) var(--sp-3);
  border-radius: var(--r-s);
  margin: 1px var(--sp-2);
  cursor: default;
  transition: background var(--dur-fast);
}
.file-row:hover { background: rgba(255,255,255,0.05); }

.file-row .file-name {
  flex: 1;
  font-size: var(--text-sm);
  color: var(--text-1);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-row .file-pages {
  font-size: var(--text-sm);
  color: var(--text-2);
  flex-shrink: 0;
}

/* ── Page rows ── */
.page-row {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 3px var(--sp-3);
  border-radius: var(--r-s);
  margin: 1px var(--sp-2);
  cursor: pointer;
  transition: background var(--dur-fast);
  user-select: none;
}
.page-row:hover   { background: rgba(255,255,255,0.05); }
.page-row.current { background: var(--accent-dim); }
.page-row.current .page-label { color: var(--accent-light); }

.page-row.skipped .page-label { text-decoration: line-through; color: var(--text-3); }
.page-row.skipped .page-thumb-wrap { opacity: 0.35; }

.page-label {
  font-size: var(--text-sm);
  color: var(--text-1);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.page-thumb-wrap {
  width: 24px;
  height: 34px;
  border-radius: var(--r-xs);
  background: var(--card-bg);
  border: 1px solid var(--border);
  overflow: hidden;
  flex-shrink: 0;
}

.page-thumb-wrap canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* ── Stamp palette ── */
.stamp-palette {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-3);
}

.stamp-thumb {
  width: 56px;
  height: 56px;
  border-radius: var(--r-m);
  border: 2px solid var(--border);
  background: var(--card-bg);
  overflow: hidden;
  cursor: pointer;
  position: relative;
  transition: border-color var(--dur-fast), transform var(--dur-fast);
  flex-shrink: 0;
}

.stamp-thumb:hover { border-color: var(--border-focus); transform: scale(1.05); }
.stamp-thumb.active { border-color: var(--accent); }
.stamp-thumb.disabled { opacity: 0.4; }

.stamp-thumb canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.stamp-thumb .stamp-actions {
  position: absolute;
  top: 2px; right: 2px;
  display: none;
  gap: 2px;
}
.stamp-thumb:hover .stamp-actions { display: flex; }

.stamp-add {
  width: 56px;
  height: 56px;
  border-radius: var(--r-m);
  border: 2px dashed var(--border);
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-2);
  transition: border-color var(--dur-fast), color var(--dur-fast);
}
.stamp-add:hover { border-color: var(--accent); color: var(--accent-light); }

/* ── Nav bar ── */
.nav-bar {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.page-counter {
  font-size: var(--text-sm);
  color: var(--text-2);
  font-variant-numeric: tabular-nums;
  min-width: 70px;
  text-align: center;
}

/* ── Progress overlay ── */
#progress-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--sp-4);
  z-index: 100;
  backdrop-filter: blur(4px);
}

#progress-overlay.hidden { display: none; }

.progress-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--r-l);
  padding: var(--sp-5);
  width: 340px;
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.progress-title {
  font-size: var(--text-md);
  font-weight: 600;
  color: var(--text-1);
}

.progress-msg {
  font-size: var(--text-sm);
  color: var(--text-2);
}

.progress-bar-track {
  height: 6px;
  border-radius: 3px;
  background: var(--surface);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  border-radius: 3px;
  background: var(--accent);
  transition: width 150ms var(--ease);
  width: 0%;
}

/* ── Drop zone overlay ── */
#drop-overlay {
  position: fixed;
  inset: 0;
  background: rgba(53,132,228,0.12);
  border: 3px dashed var(--accent);
  border-radius: var(--r-l);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--dur-mid) var(--ease);
  margin: var(--sp-3);
}

#drop-overlay.active { opacity: 1; }

#drop-overlay p {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--accent-light);
}

/* ── Toast ── */
#toast {
  position: fixed;
  bottom: var(--sp-5);
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--r-m);
  padding: var(--sp-2) var(--sp-4);
  font-size: var(--text-sm);
  color: var(--text-1);
  z-index: 200;
  opacity: 0;
  transition: opacity var(--dur-mid) var(--ease), transform var(--dur-mid) var(--ease);
  pointer-events: none;
  white-space: nowrap;
}

#toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}