*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* Demo badge */
.demo-badge {
  position: fixed; top: 6px; left: 50%; transform: translateX(-50%);
  z-index: 9999; padding: 3px 16px; border-radius: 4px;
  background: #f59e0b; color: #000; font-weight: 700; font-size: 12px;
  letter-spacing: 0.5px; pointer-events: none; white-space: nowrap;
}
.demo-badge.hidden { display: none; }

/* Demo notice — banner at the top of the Sheets tab */
.demo-notice {
  margin: 8px 8px 4px; padding: 8px 12px; border-radius: 6px;
  background: rgba(245, 158, 11, 0.12); border: 1px solid #f59e0b;
  color: #f59e0b; font-size: 12px; line-height: 1.4;
}
.demo-notice.hidden { display: none; }

/* Demo → pricing upsell: thin bar shown under the result after a demo compare.
   Theme-var colours so it works in both light and dark (no hardcoded fills). */
#demo-upsell {
  margin: 8px; padding: 9px 14px; border-radius: 6px; text-align: center;
  background: color-mix(in srgb, var(--accent) 10%, var(--panel-bg));
  border: 1px solid var(--accent); color: var(--text-muted);
  font-size: 12.5px; line-height: 1.4;
}
#demo-upsell a {
  color: var(--accent); font-weight: 600; text-decoration: none; white-space: nowrap;
}
#demo-upsell a:hover { color: var(--accent-hover); text-decoration: underline; }
#demo-upsell.hidden { display: none; }

:root {
  --panel-bg: #ffffff;
  --app-bg: #f0f2f5;
  --border: #e2e8f0;
  --accent: #4a6cf7;
  --accent-hover: #3a5ce7;
  --text: #1a1a2e;
  --text-muted: #64748b;
  --red: #ef4444;
  --blue: #3b82f6;
  --green: #22c55e;
  --thumb-size: 80px; /* overridden by JS */
  --bar-h: 44px;      /* единая высота: вкладки слева ↔ рабочий тулбар справа */
  --card-bg: #fafafa;
  --card-hover: #f0f4ff;
  --drop-active: #eef2ff;
  --img-shadow: rgba(0,0,0,0.08);
  --hint-bg: rgba(15, 23, 42, 0.82);
  --frag-complete-bg: #f0fdf4;
  --frag-complete-border: #86efac;
  --frag-incomplete-bg: #fffbeb;
  --frag-incomplete-border: #fcd34d;
  --instr-old-bg: #fef2f2;
  --instr-old-border: #fca5a5;
  --instr-old-text: #b91c1c;
  --instr-new-bg: #eff6ff;
  --instr-new-border: #93c5fd;
  --instr-new-text: #1d4ed8;
  --error-bg: #fef2f2;
  --error-border: #fca5a5;
  --error-text: #b91c1c;
}

[data-theme="dark"] {
  --panel-bg: #1e1e2e;
  --app-bg: #14141f;
  --border: #2e2e44;
  --accent: #6c8cff;
  --accent-hover: #5a7af0;
  --text: #e0e0ec;
  --text-muted: #8888a4;
  --red: #f87171;
  --blue: #60a5fa;
  --green: #4ade80;
  --card-bg: #252538;
  --card-hover: #2a2a44;
  --drop-active: #1e2a4a;
  --img-shadow: rgba(0,0,0,0.35);
  --hint-bg: rgba(0, 0, 0, 0.75);
  --frag-complete-bg: #162316;
  --frag-complete-border: #2d6a2d;
  --frag-incomplete-bg: #2a2410;
  --frag-incomplete-border: #8a7020;
  --instr-old-bg: #2a1616;
  --instr-old-border: #7a3030;
  --instr-old-text: #f87171;
  --instr-new-bg: #161e2a;
  --instr-new-border: #305a7a;
  --instr-new-text: #60a5fa;
  --error-bg: #2a1616;
  --error-border: #7a3030;
  --error-text: #f87171;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--app-bg);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* ===================== APP HEADER (top chrome bar) ===================== */
#app-header {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding: 4px 14px;
  background: var(--border);   /* цвет разделителя — шапка на полтона светлее панелей */
  border-bottom: 1px solid var(--app-bg);  /* отрезает шапку от разделителя того же цвета */
  flex-shrink: 0;
}
/* Единая высота всех кнопок шапки — стиль (заливка/контур) делит их по смыслу,
   но по росту они выровнены. */
#app-header .btn,
#app-header .btn-icon {
  height: 24px;
  min-height: 0;            /* не даём flex-авто-минимуму перебить height */
  line-height: 1;
  display: inline-flex;
  align-items: center;
  box-sizing: border-box;
}
/* заливочные кнопки (.btn) — без рамки → их заливка на все 26px и кажется выше
   контурных. Прозрачная рамка 1px уравнивает силуэт с .btn-icon (24px заливки). */
#app-header .btn {
  border: 1px solid transparent;
}
.header-left,
.header-right {
  flex: 1 1 0;
  display: flex;
  align-items: center;
  gap: 6px;
}
.header-center {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
}
.header-right { justify-content: flex-end; }
.app-logo {
  font-weight: 800;
  letter-spacing: 1.5px;
  font-size: 1rem;
  color: var(--text);
  user-select: none;
}
/* ===================== MAIN LAYOUT ===================== */
#app {
  display: flex;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

/* ===================== LEFT PANEL ===================== */
#left-panel {
  width: 420px;
  min-width: 200px;
  max-width: 800px;
  display: flex;
  flex-direction: column;
  background: var(--panel-bg);
  border-right: 1px solid var(--border);
  transition: width 0.2s ease;
  overflow: hidden;
}

#left-panel.collapsed {
  width: 0 !important;
  min-width: 0;
  border-right: none;
}

/* Footer of tab-order: hidden-pages toggle + thumbnail size slider */
#tab-order-footer {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 8px 12px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  background: var(--app-bg);
}
#tab-order-footer .footer-row {
  display: flex;
  align-items: center;
  gap: 8px;
}
.thumb-scale-label {
  font-size: 0.74rem; color: var(--text-muted); white-space: nowrap;
}
#tab-order-footer input[type=range] {
  flex: 1; accent-color: var(--accent);
}
.hidden-toggle {
  display: flex; align-items: center; gap: 6px;
  font-size: 0.78rem; color: var(--text-muted); cursor: pointer; flex: 1;
}
.hidden-toggle input { accent-color: var(--accent); width: 13px; height: 13px; cursor: pointer; }
.hidden-toggle input:disabled + span { opacity: 0.5; cursor: default; }
.btn-mini {
  padding: 3px 8px; font-size: 0.72rem;
  border: 1px solid var(--border); border-radius: 5px;
  background: var(--app-bg); color: var(--text); cursor: pointer;
  white-space: nowrap;
}
.btn-mini:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.btn-mini:disabled { opacity: 0.35; cursor: not-allowed; }

/* Footer of tab-fragments: автопоиск/автовыбор переехали сюда */
#tab-fragments-footer {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 8px 12px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  background: var(--app-bg);
}
#tab-fragments-footer .fp-autosearch-label { margin-top: 0; }

/* Подпись фильтра «только текущий лист» */
.fp-filter-note {
  margin: 6px 10px;
  padding: 6px 10px;
  font-size: 0.72rem;
  color: var(--text-muted);
  background: var(--app-bg);
  border: 1px dashed var(--border);
  border-radius: 6px;
  text-align: center;
}

/* Hide/restore button on thumbnail card */
.thumb-action {
  position: absolute;
  top: 2px; right: 2px;
  width: 18px; height: 18px;
  padding: 0; line-height: 1;
  font-size: 0.78rem;
  border: 1px solid var(--border);
  background: var(--panel-bg);
  color: var(--text-muted);
  border-radius: 3px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.12s, color 0.12s, background 0.12s, border-color 0.12s;
}
.thumb-card { position: relative; }
.thumb-card:hover .thumb-action { opacity: 1; }
.thumb-action:hover { background: var(--red); color: #fff; border-color: var(--red); }

/* Hidden-pages section */
.hidden-section-sep {
  margin: 8px 4px 4px;
  padding: 4px 0;
  font-size: 0.65rem; font-weight: 700; letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  border-top: 1px dashed var(--border);
  text-align: center;
}
.thumb-card.hidden-page {
  opacity: 0.45;
  border-color: var(--red);
  cursor: default;
}
.thumb-card.hidden-page .thumb-action { opacity: 1; color: var(--accent); }
.thumb-card.hidden-page .thumb-action:hover { background: var(--accent); color: #fff; border-color: var(--accent); }

/* Top-right toolbar buttons */
#btn-lang {
  font-size: 0.72rem !important;
  font-weight: 700;
  letter-spacing: 0.04em;
  min-width: 30px;
}

/* Tab strip */
#left-tabs {
  display: flex;
  height: var(--bar-h);
  box-sizing: border-box;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  background: var(--app-bg);
}
.tab-btn {
  flex: 1;
  padding: 8px 6px;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.12s, border-color 0.12s, background 0.12s;
  white-space: nowrap;
}
.tab-btn:hover { background: var(--card-hover); color: var(--text); }
.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* Tab panels — fill the remaining height of the left panel */
.tab-content {
  display: none;
  flex: 1;
  min-height: 0;
  flex-direction: column;
  overflow: hidden;
}
.tab-content.active { display: flex; }

/* Columns header row */
#col-headers {
  display: grid;
  grid-template-columns: 30px 1fr;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
#col-headers-middle {
  display: flex;
  flex-direction: column;
}
.col-header {
  padding: 8px 10px;
  display: flex; flex-direction: column; gap: 4px;
}
#col-header-old {
  border-bottom: 1px solid var(--border);
}

/* Pair checkboxes column header */
#pair-col-header {
  display: flex; align-items: center; justify-content: center;
  padding: 4px 0;
  /* Border-right (not the neighbour's border-left) so this divider lines up to
     the pixel with #pair-col's border-right in the rows below — both 29–30px. */
  border-right: 1px solid var(--border);
}
#pair-col-header input { accent-color: var(--accent); width: 14px; height: 14px; cursor: pointer; }

.col-title {
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--text-muted);
}
.col-title.old { color: var(--red); }
.col-title.new { color: var(--blue); }
.col-filename {
  font-size: 0.78rem; color: var(--text); font-weight: 500;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

.btn-upload {
  padding: 5px 10px; border-radius: 6px; border: 1px solid var(--border);
  background: var(--app-bg); font-size: 0.78rem; cursor: pointer;
  white-space: nowrap; color: var(--text);
}
.btn-upload:hover { background: var(--card-hover); border-color: var(--accent); color: var(--accent); }

/* "Open example" — onboarding CTA above the upload columns (STAGE1 C3).
   Left inset 40px = 30px pair-checkbox column + 10px col padding,
   so the button's edges line up exactly with the Upload PDF buttons below. */
#sample-bar { margin: 6px 10px 0 40px; }
#sample-bar.hidden { display: none; }
.btn-sample {
  display: block; width: 100%; box-sizing: border-box;
  padding: 5px 10px; border-radius: 6px; border: 1px solid var(--accent);
  background: var(--accent); color: #fff; font-size: 0.78rem; cursor: pointer;
  white-space: nowrap;
}
.btn-sample:hover:not(:disabled) { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn-sample:disabled { opacity: 0.6; cursor: default; }
/* Horizontal separator under the sample CTA — shown together with the button. */
.sample-divider { border: none; border-top: 1px solid var(--border); margin: 8px 0 0; }
.sample-divider.hidden { display: none; }

/* Thumbnail columns — ONE shared scroll */
#col-body {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  min-height: 0;
}

#col-rows {
  display: grid;
  grid-template-columns: 30px 1fr 1fr;
  min-height: 100%;
}

/* Pair checkboxes column — высота строки, gap и верхний паддинг ДОЛЖНЫ
   совпадать с .thumb-col (padding 5px, gap 3px) и высотой .thumb-card
   (img 1.41×size + padding 6 + border 2 = 1.41×size + 8px), иначе чекбоксы
   накапливают вертикальный дрейф относительно миниатюр. */
#pair-col {
  display: flex; flex-direction: column;
  gap: 3px;
  padding: 5px 0;
  border-right: 1px solid var(--border);
}
.pair-check-cell {
  display: flex; align-items: center; justify-content: center;
  height: calc(var(--thumb-size) * 1.41 + 8px);
  flex-shrink: 0;
  cursor: pointer;  /* вся ячейка кликабельна (это <label>) */
}
.pair-check-cell:has(input:disabled) { cursor: default; }
.pair-check-cell input { accent-color: var(--accent); width: 14px; height: 14px; cursor: pointer; }

.thumb-col {
  padding: 5px 4px;
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.thumb-col + .thumb-col { border-left: 1px solid var(--border); }

/* Drop zone overlay for column */
.thumb-col.drop-active {
  background: var(--drop-active);
  outline: 2px dashed var(--accent);
  outline-offset: -4px;
}

/* Empty state */
.col-empty {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  height: 100%; gap: 10px; color: var(--text-muted);
  font-size: 0.82rem; text-align: center; padding: 20px;
  border: 2px dashed var(--border); border-radius: 10px;
  cursor: pointer; min-height: 120px;
}
.col-empty .icon { font-size: 2rem; }
.col-empty:hover { border-color: var(--accent); background: var(--card-hover); }

/* Thumbnail card */
.thumb-card {
  display: flex; align-items: center; gap: 5px;
  padding: 3px 4px;
  border: 1px solid var(--border); border-radius: 6px;
  background: var(--card-bg); cursor: grab;
  transition: background 0.12s, border-color 0.12s;
  user-select: none;
  position: relative;
}
.thumb-placeholder {
  height: calc(var(--thumb-size) * 1.41 + 8px);
  flex-shrink: 0;
}
.thumb-card:hover { background: var(--card-hover); border-color: var(--accent); }
.thumb-card.drag-over { border-color: var(--accent); background: var(--drop-active); }
.thumb-card.dragging { opacity: 0.35; }
.thumb-card.excluded { opacity: 0.4; }

.thumb-card input[type=checkbox] {
  flex-shrink: 0; width: 14px; height: 14px; cursor: pointer; accent-color: var(--accent);
}
.thumb-img {
  width: var(--thumb-size);
  height: calc(var(--thumb-size) * 1.41); /* A4 ratio */
  object-fit: contain;
  border-radius: 3px; background: var(--border); flex-shrink: 0;
}
.thumb-label { font-size: 0.75rem; color: var(--text-muted); line-height: 1.3; }
.drag-handle { margin-left: auto; color: #c0cad8; font-size: 1rem; cursor: grab; flex-shrink: 0; }

/* ===================== DIVIDER ===================== */
#divider {
  width: 14px; flex-shrink: 0; cursor: col-resize;
  background: var(--border); transition: background 0.15s;
  position: relative; z-index: 10;
  display: flex; align-items: center; justify-content: center;
}
#divider:hover, #divider.dragging { background: var(--accent); opacity: 0.5; }

#btn-panel-toggle {
  position: absolute;
  top: 50%; transform: translateY(-50%);
  width: 20px; height: 36px;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.65rem;
  color: var(--text-muted);
  display: flex; align-items: center; justify-content: center;
  padding: 0;
  box-shadow: 0 1px 4px rgba(0,0,0,0.1);
  z-index: 11;
  transition: background 0.12s, color 0.12s;
}
#btn-panel-toggle:hover { background: var(--accent); color: #fff; border-color: var(--accent); }

/* ===================== RIGHT PANEL ===================== */
#right-panel {
  flex: 1; display: flex; flex-direction: column; min-width: 0; overflow: hidden;
}

/* Viewer toolbar */
#viewer-toolbar {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  /* на 1px ниже вкладок: светлый фон визуально «крупнит» полосу, компенсируем */
  height: calc(var(--bar-h) - 1px); box-sizing: border-box;
  padding: 6px 14px; border-bottom: 1px solid var(--border);
  background: var(--panel-bg); flex-shrink: 0;
}

.toolbar-group { display: flex; align-items: center; gap: 4px; }
.toolbar-sep { width: 1px; height: 22px; background: var(--border); margin: 0 4px; }

/* Метод выравнивания листа (селект в тулбаре) */
.align-mode-wrap { gap: 6px; }
.align-mode-label { font-size: 0.8rem; color: var(--text-muted); white-space: nowrap; }
.align-mode-select {
  font-size: 0.82rem; font-family: inherit; color: var(--text);
  background: var(--app-bg);
  border: 1px solid var(--border); border-radius: 6px;
  padding: 4px 6px; cursor: pointer;
  transition: border-color 0.12s, box-shadow 0.12s;
}
.align-mode-select:hover:not(:disabled) { border-color: var(--text-muted); }
.align-mode-select:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 25%, transparent);
}
.align-mode-select:disabled { opacity: 0.4; cursor: not-allowed; }

/* Buttons */
.btn { padding: 6px 14px; border: none; border-radius: 7px; font-size: 0.85rem; font-weight: 600; cursor: pointer; transition: opacity 0.15s, background 0.12s; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:not(:disabled):hover { background: var(--accent-hover); }
/* Кнопка «Сравнить»: PDF загружены, но сравнения ещё не было → красная с
   мягкой пульсацией, чтобы акцентировать следующий шаг. После сравнения
   класс снимается (updateCompareBtn / done-ветка опроса) и кнопка
   возвращается к обычной синей btn-primary. */
#btn-compare.needs-compare { background: var(--red); animation: compare-pulse 1.6s ease-in-out infinite; }
#btn-compare.needs-compare:not(:disabled):hover { background: var(--red); filter: brightness(0.92); }
@keyframes compare-pulse {
  0%, 100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--red) 60%, transparent); }
  70%      { box-shadow: 0 0 0 5px color-mix(in srgb, var(--red) 0%, transparent); }
}
.btn-sm { padding: 5px 10px; font-size: 0.82rem; }
.btn-icon { padding: 5px 9px; background: var(--app-bg); border: 1px solid var(--border); border-radius: 6px; cursor: pointer; font-size: 0.9rem; color: var(--text); }
.btn-icon:hover { background: var(--card-hover); }
.btn-icon.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* View mode toggle */
.view-toggle { display: flex; border: 1px solid var(--border); border-radius: 7px; overflow: hidden; }
.view-toggle button {
  padding: 5px 12px; border: none; background: transparent;
  font-size: 0.82rem; cursor: pointer; color: var(--text-muted); white-space: nowrap;
}
.view-toggle button.active { background: var(--accent); color: #fff; }
.view-toggle button:not(.active):hover { background: var(--app-bg); }
.view-toggle .btn-swap {
  padding: 5px 7px;
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
  font-size: 1rem; line-height: 1;
}

/* Zoom */
.zoom-wrap { display: flex; align-items: center; gap: 4px; }
.zoom-pct { font-size: 0.8rem; color: var(--text-muted); min-width: 38px; text-align: center; }

/* ORB toggle */
.orb-label { display: flex; align-items: center; gap: 5px; font-size: 0.8rem; color: var(--text-muted); cursor: pointer; }
.orb-label input { accent-color: var(--accent); width: 13px; height: 13px; }
.orb-badge { font-size: 0.68rem; padding: 1px 5px; border-radius: 8px; background: #fef3c7; color: #92400e; font-weight: 600; }

/* ===================== VIEWER AREA ===================== */
#viewer-area {
  flex: 1; display: flex; flex-direction: column; overflow: hidden; min-height: 0;
  position: relative; /* anchor для плавающей мини-панели #page-nav */
}

/* Progress bar */
#progress-wrap {
  padding: 8px 14px; flex-shrink: 0;
  display: flex; align-items: center; gap: 10px; font-size: 0.82rem; color: var(--text-muted);
}
#progress-wrap.hidden { display: none; }
.progress-track { flex: 1; height: 5px; background: var(--border); border-radius: 3px; overflow: hidden; }
.progress-fill { height: 100%; background: var(--accent); border-radius: 3px; transition: width 0.35s ease; width: 0%; }

/* Debug timing bar */
#debug-timing-bar {
  padding: 5px 14px; flex-shrink: 0;
  font-size: 0.78rem; font-family: monospace; color: var(--text-muted);
  background: var(--app-bg); border-bottom: 1px solid var(--border);
}
#debug-timing-bar.hidden { display: none; }

/* Error */
#error-box {
  margin: 10px 14px; padding: 12px 16px;
  background: var(--error-bg); border: 1px solid var(--error-border); border-radius: 8px;
  color: var(--error-text); font-size: 0.88rem;
}
#error-box.hidden { display: none; }

/* Empty right panel */
#viewer-empty {
  flex: 1; display: flex; align-items: center; justify-content: center;
  color: var(--text-muted); font-size: 0.9rem; text-align: center;
  flex-direction: column; gap: 10px;
}
#viewer-empty .icon { font-size: 3rem; opacity: 0.3; }

/* --- PAGE MODE --- */
#viewer-page {
  flex: 1; display: flex; flex-direction: column; align-items: center;
  overflow: hidden; padding: 8px 14px 12px;
}
#viewer-page.hidden { display: none; }

/* Постраничная навигация — плавающая мини-панель по центру вверху viewer-area.
   position:absolute, чтобы не занимать вертикаль и парить над чертежом. */
#page-nav {
  position: absolute; top: 8px; left: 50%; transform: translateX(-50%);
  z-index: 20;
  display: flex; align-items: center; gap: 4px;
  padding: 3px 6px;
  background: color-mix(in srgb, var(--panel-bg) 88%, transparent);
  border: 1px solid var(--border); border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.18);
  backdrop-filter: blur(4px);
}
#page-nav.hidden { display: none; }
.page-counter {
  font-size: 0.88rem; color: var(--text-muted);
  display: inline-flex; align-items: center; gap: 5px;
}
#page-input {
  width: 2.4em; text-align: center;
  font-size: inherit; font-family: inherit; color: var(--text);
  background: var(--app-bg);
  border: 1px solid var(--border); border-radius: 5px;
  padding: 2px 4px;
  transition: border-color 0.12s, box-shadow 0.12s;
}
#page-input:hover { border-color: var(--text-muted); }
#page-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 25%, transparent);
}
/* убрать спиннеры на случай type=number у каких-то браузеров */
#page-input::-webkit-outer-spin-button,
#page-input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
#page-total { color: var(--text-muted); white-space: nowrap; }

#page-img-wrap {
  flex: 1; width: 100%; overflow: hidden;
  position: relative;
  cursor: grab;
}
#page-img-wrap.panning { cursor: grabbing; }
/* #diff-canvas is a transform wrapper around #diff-img and any tile overlays.
   Pan/zoom is applied here (NOT on individual images) so children just use
   plain image-space CSS positions without per-element origin math.
   Border/shadow lives on the wrapper, NOT on #diff-img: a 1px border on the
   img would push its content 1px right+down from the wrapper's (0,0), but
   absolutely-positioned overlays anchor at the wrapper's inner edge — so
   tiles would land 1px above-left of the base image. With the frame on the
   wrapper, base and overlays share the same origin (the wrapper's padding box,
   which is inside the border). */
#diff-canvas {
  position: absolute;
  top: 0; left: 0;
  transform-origin: 0 0;
  border: 1px solid var(--border);
  border-radius: 4px;
  box-shadow: 0 2px 12px var(--img-shadow);
}
#diff-img {
  display: block;
  user-select: none; pointer-events: none;
}

/* Tile overlays sit on top of #diff-img and cover regions that have changed
   since the base image was loaded. Positioned in image-space pixels; transform
   is inherited from the parent #diff-canvas. */
.diff-tile-overlay {
  position: absolute;
  display: block;
  user-select: none; pointer-events: none;
  z-index: 5;  /* above #diff-img */
}

/* Change-zone polygon overlay — rides #diff-canvas's transform (image-space). */
#zone-overlay {
  position: absolute;
  top: 0; left: 0;
  pointer-events: none;
  z-index: 6;  /* above tiles */
  overflow: visible;
}
.zone-poly {
  fill: rgba(245, 158, 11, 0.08);
  stroke: #f59e0b;
  stroke-width: 2px;
  vector-effect: non-scaling-stroke;  /* линия не толстеет при зуме */
}
.zone-poly.active {
  fill: rgba(245, 158, 11, 0.18);
  stroke: #d97706;
  stroke-width: 3px;
}

/* Kernel-size visualization — screen-space circle in the viewport center. */
#kernel-circle {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  border: 2px dashed var(--accent);
  background: rgba(99, 102, 241, 0.12);
  border-radius: 50%;
  pointer-events: none;
  z-index: 20;
  transition: opacity 0.4s;
}
#kernel-circle.hidden { display: none; }

/* --- CONTINUOUS MODE --- */
#viewer-continuous {
  flex: 1; overflow-y: auto; overflow-x: hidden;
  padding: 12px 14px; display: flex; flex-direction: column; gap: 14px;
}
#viewer-continuous.hidden { display: none; }

.cont-page { display: flex; flex-direction: column; align-items: center; gap: 6px; }
.cont-page-label { font-size: 0.78rem; color: var(--text-muted); align-self: flex-start; }
.cont-page img {
  width: 100%;
  max-width: 100%;
  height: auto; border: 1px solid var(--border);
  border-radius: 4px; box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  display: block;
  background: var(--border); /* placeholder color */
}
.cont-page img.loading {
  min-height: 400px; background: linear-gradient(90deg, #f0f2f5 25%, #e8ecf3 50%, #f0f2f5 75%);
  background-size: 200% 100%; animation: shimmer 1.4s infinite;
}
@keyframes shimmer { 0%{background-position:200% 0} 100%{background-position:-200% 0} }

/* ===================== LEGEND ===================== */
.legend {
  display: flex; gap: 12px; align-items: center; font-size: 0.75rem; color: var(--text-muted); flex-shrink: 0;
}
.leg-dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; margin-right: 4px; }

/* ===================== MISC ===================== */
.hidden { display: none !important; }

/* ===================== FRAGMENTS PANEL (lives inside #tab-fragments) ===================== */

#fp-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.fp-title {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  flex: 1;
}

.fp-count {
  font-size: 0.72rem;
  font-weight: 700;
  background: var(--accent);
  color: #fff;
  border-radius: 10px;
  padding: 1px 7px;
  min-width: 20px;
  text-align: center;
}

#fp-toolbar {
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.fp-autosearch-label {
  display: flex; align-items: center; gap: 5px;
  margin-top: 6px;
  font-size: 0.78rem; color: var(--text-muted); cursor: pointer;
}
.fp-autosearch-label input[type=checkbox] { accent-color: var(--accent); width: 13px; height: 13px; flex-shrink: 0; }
.fp-autosearch-label input[type=number] {
  padding: 1px 3px; border: 1px solid var(--border); border-radius: 4px;
  background: var(--app-bg); color: var(--text); font-size: 0.78rem;
}
.fp-autosearch-label input[type=number]:disabled { opacity: 0.4; }

#btn-add-fragment {
  width: 100%;
  padding: 8px 10px;
  border-radius: 7px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  font-size: 0.84rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s, color 0.12s;
  white-space: nowrap;
}
#btn-add-fragment:hover:not(:disabled) { background: var(--accent-hover); border-color: var(--accent-hover); }
#btn-add-fragment:disabled { opacity: 0.45; cursor: not-allowed; background: var(--border); color: var(--text-muted); border-color: var(--border); }
#btn-add-fragment.cancelling { background: var(--red); border-color: var(--red); color: #fff; }
#btn-add-fragment.cancelling:hover { background: #dc2626; border-color: #dc2626; }

#fp-instruction {
  margin: 8px 10px;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 0.8rem;
  line-height: 1.5;
  flex-shrink: 0;
}
#fp-instruction.fp-instr-old {
  background: var(--instr-old-bg);
  border: 1px solid var(--instr-old-border);
  color: var(--instr-old-text);
}
#fp-instruction.fp-instr-new {
  background: var(--instr-new-bg);
  border: 1px solid var(--instr-new-border);
  color: var(--instr-new-text);
}

#fp-find-wrap,
#fp-accept-wrap {
  margin: 4px 10px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

#btn-find-fragment {
  width: 100%;
  padding: 6px 10px;
  border-radius: 7px;
  border: 1px solid #93c5fd;
  background: #eff6ff;
  color: #1d4ed8;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.12s;
}
#btn-find-fragment:hover:not(:disabled) { background: #dbeafe; }
#btn-find-fragment:disabled { opacity: 0.5; cursor: not-allowed; }

#btn-accept-suggestion {
  padding: 5px 12px;
  border-radius: 7px;
  border: 1px solid #86efac;
  background: #f0fdf4;
  color: #15803d;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.12s;
  flex-shrink: 0;
}
#btn-accept-suggestion:hover { background: #dcfce7; }

.fp-confidence {
  font-size: 0.75rem;
  color: var(--text-muted);
}

#fp-list {
  flex: 1;
  overflow-y: auto;
  padding: 6px 8px;
}

#fp-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 80px;
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.6;
  padding: 20px 16px;
}

/* ===== TAB: ИЗМЕНЕНИЯ ===== */
#zone-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
#zone-nav { display: flex; gap: 4px; }
#zone-list {
  flex: 1;
  overflow-y: auto;
  padding: 6px 8px;
}
#zone-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 80px;
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.6;
  padding: 20px 16px;
}
.zone-item {
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 7px 10px;
  margin-bottom: 6px;
  background: var(--card-bg);
  cursor: pointer;
  transition: border-color 0.12s, background 0.12s;
}
.zone-item:hover { border-color: var(--accent); }
.zone-item.active { border-color: #d97706; background: rgba(245, 158, 11, 0.10); }
.zone-num {
  font-size: 0.72rem;
  font-weight: 700;
  color: #fff;
  background: #f59e0b;
  border-radius: 4px;
  padding: 1px 7px;
  min-width: 20px;
  text-align: center;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}
.zone-meta {
  font-size: 0.74rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}
#tab-changes-footer {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px 12px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}
.zone-slider-row {
  display: flex;
  flex-direction: column;
  gap: 3px;
  cursor: pointer;
}
.zone-slider-label {
  font-size: 0.74rem;
  color: var(--text-muted);
}
.zone-slider-row input[type=range] { accent-color: var(--accent); width: 100%; }

/* Fragment items */
.fragment-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  margin-bottom: 6px;
  background: var(--card-bg);
  transition: border-color 0.12s, background 0.12s;
}
.fragment-item.complete  { border-color: var(--frag-complete-border); background: var(--frag-complete-bg); }
.fragment-item.incomplete { border-color: var(--frag-incomplete-border); background: var(--frag-incomplete-bg); }
.fragment-item:hover { border-color: var(--accent); }

.fi-header {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 5px;
}

.fi-name {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.fi-num {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent);
  background: var(--app-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}
.fi-page {
  font-size: 0.72rem;
  color: var(--text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}
.fi-page.fi-page-stale {
  color: var(--red);
  font-weight: 600;
}

.fi-delete {
  margin-left: auto;       /* крестик — в правый угол шапки карточки */
  border: none;
  background: none;
  color: var(--text-muted);
  font-size: 0.75rem;
  cursor: pointer;
  padding: 2px 5px;
  border-radius: 4px;
  line-height: 1;
  flex-shrink: 0;
}
.fi-delete:hover { background: #fee2e2; color: var(--red); }

.fi-regions { display: flex; gap: 5px; flex-wrap: wrap; }

.fi-tag {
  font-size: 0.68rem;
  padding: 2px 7px;
  border-radius: 10px;
  font-weight: 600;
}
.fi-tag.ok      { background: #dcfce7; color: #15803d; }
.fi-tag.missing { background: var(--app-bg); color: var(--text-muted); }

/* Fragment thumbnails */
.fi-thumbs {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-top: 6px;
  min-height: 0;
}

.fi-thumb {
  flex: 1 1 0;
  min-width: 0;
  max-height: 80px;
  width: 100%;
  object-fit: contain;
  object-position: center;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: #f8f9fa;
  display: block;
}

.fi-thumb-old { border-color: #fca5a5; }  /* red tint — old version */
.fi-thumb-new { border-color: #93c5fd; }  /* blue tint — new version */

.fi-thumb-arrow {
  flex-shrink: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1;
}

/* (removed: #fp-divider / #btn-fp-toggle — fragments panel lives inside a tab) */

/* ===================== CANVAS SELECTION ===================== */
#selection-canvas {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 10;
}
#selection-canvas.active {
  pointer-events: all;
  cursor: crosshair;
}

#selection-hint {
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--hint-bg);
  color: #fff;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
  pointer-events: none;
  z-index: 20;
  white-space: nowrap;
  display: none;
}
#selection-hint.visible { display: block; }

/* ===================== RECT CONFIRM BUTTONS ===================== */
#rect-confirm-wrap {
  position: absolute;
  z-index: 25;
  display: flex;
  gap: 6px;
  pointer-events: all;
}
#rect-confirm-wrap.hidden { display: none; }
#rect-confirm-wrap button {
  padding: 5px 11px;
  border: none;
  border-radius: 5px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(0,0,0,0.25);
  white-space: nowrap;
}
#btn-confirm-rect {
  background: #22c55e;
  color: #fff;
}
#btn-confirm-rect:hover { background: #16a34a; }
#btn-add-region {
  background: #f59e0b;
  color: #fff;
}
#btn-add-region:hover { background: #d97706; }
#btn-add-region.hidden { display: none; }
#btn-redraw-rect {
  background: #fff;
  color: #374151;
  border: 1px solid #d1d5db;
}
#btn-redraw-rect:hover { background: #f3f4f6; }

/* ===================== SOURCE TOGGLE DISABLED ===================== */
.view-toggle button:disabled {
  opacity: 0.38;
  cursor: not-allowed;
}

/* ===================== THEME TOGGLE ===================== */
#btn-theme {
  background: none; border: 1px solid var(--border);
  border-radius: 6px; width: 30px; height: 30px;
  cursor: pointer; font-size: 1rem; color: var(--text-muted);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; transition: background 0.12s, color 0.12s;
}
#btn-theme:hover { background: var(--card-hover); color: var(--text); }

/* Dark theme overrides for remaining hardcoded elements */
[data-theme="dark"] .btn-upload { background: var(--card-bg); color: var(--text); }
[data-theme="dark"] .view-toggle button:not(.active):hover { background: var(--card-bg); }
[data-theme="dark"] .cont-page img { background: var(--border); }
[data-theme="dark"] #btn-confirm-rect { background: #16a34a; }
[data-theme="dark"] #btn-add-region { background: #d97706; }
[data-theme="dark"] #btn-redraw-rect { background: var(--card-bg); color: var(--text); border-color: var(--border); }
[data-theme="dark"] #btn-redraw-rect:hover { background: var(--card-hover); }
[data-theme="dark"] .fi-delete:hover { background: var(--instr-old-bg); color: var(--red); }
[data-theme="dark"] .fi-tag.ok { background: var(--frag-complete-bg); color: var(--green); }
[data-theme="dark"] .fi-tag.missing { background: var(--card-bg); color: var(--text-muted); }
[data-theme="dark"] .fi-thumb { background: var(--card-bg); }
[data-theme="dark"] .orb-badge { background: var(--frag-incomplete-bg); color: #d97706; }
[data-theme="dark"] #btn-find-fragment { background: var(--instr-new-bg); border-color: var(--instr-new-border); color: var(--instr-new-text); }
[data-theme="dark"] #btn-find-fragment:hover:not(:disabled) { background: var(--drop-active); }
[data-theme="dark"] #btn-accept-suggestion { background: var(--frag-complete-bg); border-color: var(--frag-complete-border); color: var(--green); }
[data-theme="dark"] #btn-collapse:hover { background: var(--card-bg); }
[data-theme="dark"] .cont-page img.loading { background: linear-gradient(90deg, #1e1e2e 25%, #2a2a3e 50%, #1e1e2e 75%); background-size: 200% 100%; }
[data-theme="dark"] #btn-panel-toggle { background: var(--panel-bg); }
[data-theme="dark"] #btn-fp-toggle { background: var(--panel-bg); }

/* Слим юр-футер внизу окна. Body — flex column, #app — flex:1, поэтому футер
   занимает ровно высоту своего содержимого (обычно одна строка), а рабочую
   область не съедает. На узких экранах переносится на 2 строки — это ок. */
#privacy-notice {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 6px 14px;
  padding: 6px 16px;
  border-top: 1px solid var(--border);
  background: var(--panel-bg);
  font-size: 11.5px;
  line-height: 1.4;
  color: var(--text-muted, #888);
  text-align: center;
}
#privacy-notice .legal-links {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
}
#privacy-notice .legal-links a {
  color: var(--text-muted, #888);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
#privacy-notice .legal-links a:hover {
  color: var(--text);
  border-bottom-color: currentColor;
}
#privacy-notice .legal-sep { opacity: 0.5; }

/* ===================== TOAST (session restore notice) ===================== */
#toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  z-index: 10000;
  max-width: 90vw;
  padding: 10px 18px;
  border-radius: 6px;
  background: var(--panel-bg);
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
  font-size: 0.85rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
}
#toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ===================== MODAL (confirm / alert) ===================== */
/* Замена нативным confirm()/alert(): нельзя подавить браузерной галочкой,
   работает в iframe (важно для demo на лендинге), переводится и стилизуется. */
.modal-overlay {
  position: fixed; inset: 0; z-index: 11000;
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
  background: rgba(0, 0, 0, 0.45);
}
.modal-box {
  width: 100%; max-width: 380px;
  padding: 20px;
  background: var(--panel-bg); color: var(--text);
  border: 1px solid var(--border); border-radius: 10px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.35);
}
.modal-msg { font-size: 0.9rem; line-height: 1.5; white-space: pre-line; }
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 18px; }
.modal-btn {
  padding: 7px 16px; border-radius: 7px;
  font-size: 0.85rem; font-weight: 600; cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.12s, filter 0.12s;
}
.modal-btn.primary { background: var(--accent); color: #fff; }
.modal-btn.primary:hover { background: var(--accent-hover); }
.modal-btn.danger { background: var(--red); color: #fff; }
.modal-btn.danger:hover { filter: brightness(0.92); }
.modal-btn.secondary { background: var(--app-bg); color: var(--text); border-color: var(--border); }
.modal-btn.secondary:hover { background: var(--card-hover); }