/* Tabbed PDF: Tabbed Word's layout, orange palette.
   Orange scale: 50 #fff7ed · 100 #ffedd5 · 200 #fed7aa · 300 #fdba74 · 400 #fb923c
                 500 #f97316 · 600 #ea580c · 700 #c2410c · 800 #9a3412 · 900 #7c2d12 · 950 #431407 */
:root {
  --o50: #fff7ed;
  --o100: #ffedd5;
  --o200: #fed7aa;
  --o300: #fdba74;
  --o400: #fb923c;
  --o500: #f97316;
  --o600: #ea580c;
  --o700: #c2410c;
  --o800: #9a3412;
  --o900: #7c2d12;
  --o950: #431407;

  --bg: #fff7ed;
  --ink: #431407;
  --muted: #8a5a44;
  --ribbon: #fffbf6;
  --ribbon-border: #f3d3b4;
  --viewer-bg: #ecdccd;
  --header: #7c2d12;
  --accent: var(--o700);
  --accent-hover: var(--o800);
  --focus: var(--o500);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1c0f08;
    --ink: #ffedd5;
    --muted: #d6a384;
    --ribbon: #2a150c;
    --ribbon-border: #5a2c17;
    --viewer-bg: #2b180f;
    --header: #431407;
    --accent: var(--o500);
    --accent-hover: var(--o400);
  }
}
:root[data-theme="dark"] {
  --bg: #1c0f08;
  --ink: #ffedd5;
  --muted: #d6a384;
  --ribbon: #2a150c;
  --ribbon-border: #5a2c17;
  --viewer-bg: #2b180f;
  --header: #431407;
  --accent: var(--o500);
  --accent-hover: var(--o400);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  background: var(--bg);
  color: var(--ink);
  font: 15px system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  overflow: hidden;
}

header {
  background: var(--header);
  color: #fff;
  padding: 12px 3%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
header h1 { margin: 0; font-size: 19px; letter-spacing: .2px; }
header small { display: block; opacity: .82; font-size: 11px; margin-top: 2px; }
#filename {
  font-size: 13px;
  opacity: .92;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 45%;
}
#filename.dirty::after { content: " ●"; color: var(--o300); }

#appstate {
  padding: 6px 3%;
  font-size: 12px;
  color: var(--muted);
  display: flex;
  gap: 10px;
  align-items: center;
  border-bottom: 1px solid var(--ribbon-border);
  background: var(--bg);
}

/* Ribbon tabs */
#ribbon-tabs {
  display: flex;
  gap: 3px;
  padding: 6px 3% 0;
  background: var(--ribbon);
  border-bottom: 1px solid var(--ribbon-border);
  overflow-x: auto;
  scrollbar-width: none;
}
#ribbon-tabs button {
  appearance: none;
  border: 0;
  background: transparent;
  padding: 9px 16px;
  font: 600 13px system-ui, sans-serif;
  color: var(--muted);
  border-bottom: 3px solid transparent;
  cursor: pointer;
  white-space: nowrap;
}
#ribbon-tabs button:hover { color: var(--accent); }
#ribbon-tabs button.selected { color: var(--accent); border-bottom-color: var(--o500); }

/* Ribbon command panels */
#toolbar {
  background: var(--ribbon);
  border-bottom: 1px solid var(--ribbon-border);
  padding: 9px 3%;
  position: relative;
  z-index: 5;
}
#toolbar .panel { display: none; flex-wrap: wrap; align-items: center; gap: 6px; }
#toolbar .panel.selected { display: flex; }
#toolbar button, #toolbar select, #toolbar input {
  font: 13px system-ui, sans-serif;
  min-height: 36px;
  padding: 7px 11px;
  border-radius: 6px;
  border: 1px solid var(--o200);
  background: #fff;
  color: var(--ink);
  cursor: pointer;
}
:root[data-theme="dark"] #toolbar button,
:root[data-theme="dark"] #toolbar select { background: #3a1e11; border-color: #5a2c17; }
#toolbar button:hover, #toolbar select:hover { background: var(--o100); }
#toolbar button:focus-visible, #toolbar select:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
#toolbar button:disabled { opacity: .45; cursor: default; background: #fff; }
#toolbar button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
#toolbar button.primary:hover { background: var(--accent-hover); }
#toolbar button.tool.selected, #toolbar button.symbol.selected, #toolbar button.swatch.selected {
  background: var(--o600);
  border-color: var(--o700);
  color: #fff;
}
.sep { width: 1px; align-self: stretch; background: var(--ribbon-border); margin: 2px 4px; }
.label { font-size: 12px; color: var(--muted); }
.hint { font-size: 12px; color: var(--muted); }
.tool-group { display: flex; flex-wrap: wrap; gap: 4px; }
.swatches { display: flex; gap: 6px; align-items: center; }
.swatch {
  width: 28px !important;
  min-height: 28px !important;
  height: 28px;
  padding: 0 !important;
  border-radius: 50% !important;
  border: 2px solid #fff !important;
  box-shadow: 0 0 0 1px var(--o300);
}
.swatch.selected { box-shadow: 0 0 0 2px var(--o700) !important; background-clip: padding-box !important; }
.symbol { min-width: 40px; font-size: 16px; }

/* Document tabs */
.tabs {
  display: flex;
  gap: 4px;
  padding: 8px 3% 0;
  overflow-x: auto;
  scrollbar-width: thin;
  background: var(--bg);
}
.tabs[hidden] { display: none; }
.doc-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  max-width: 240px;
  padding: 7px 8px 7px 14px;
  border: 1px solid var(--o200);
  border-bottom: 0;
  border-radius: 8px 8px 0 0;
  background: #fff6ec;
  color: var(--muted);
  font-size: 13px;
  white-space: nowrap;
  cursor: pointer;
  flex-shrink: 0;
}
:root[data-theme="dark"] .doc-tab { background: #2a150c; border-color: #5a2c17; }
.doc-tab .tname { overflow: hidden; text-overflow: ellipsis; }
.doc-tab.active { background: #fff; color: var(--ink); font-weight: 600; border-color: var(--o400); }
:root[data-theme="dark"] .doc-tab.active { background: var(--viewer-bg); }
.doc-tab .dirty { color: var(--o500); font-size: 10px; }
.doc-tab .x {
  border: 0;
  background: transparent;
  color: inherit;
  font-size: 16px;
  line-height: 1;
  padding: 2px 5px;
  border-radius: 4px;
  cursor: pointer;
}
.doc-tab .x:hover { background: var(--o200); }

/* Main area */
main {
  flex: 1;
  min-height: 0;
  display: flex;
  background: var(--viewer-bg);
  border-top: 1px solid var(--ribbon-border);
}
#thumbs {
  width: 168px;
  flex-shrink: 0;
  overflow-y: auto;
  background: var(--ribbon);
  border-right: 1px solid var(--ribbon-border);
  padding: 10px 8px;
}
#thumbs.hidden { display: none; }
#thumblist { display: flex; flex-direction: column; gap: 10px; }
.thumb {
  position: relative;
  border: 2px solid transparent;
  border-radius: 6px;
  padding: 5px;
  background: transparent;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
}
.thumb:hover { background: var(--o50); }
:root[data-theme="dark"] .thumb:hover { background: #3a1e11; }
.thumb.sel { border-color: var(--o500); background: var(--o100); }
:root[data-theme="dark"] .thumb.sel { background: #4a2414; }
.thumb.current .thumb-canvas-wrap { box-shadow: 0 0 0 1px var(--o600); }
.thumb.drop-before { box-shadow: 0 -4px 0 0 var(--o600); }
.thumb.drop-after { box-shadow: 0 4px 0 0 var(--o600); }
.thumb-canvas-wrap {
  background: #fff;
  width: 100%;
  position: relative;
  box-shadow: 0 1px 3px #0002;
  overflow: hidden;
}
.thumb-canvas-wrap canvas { display: block; width: 100%; height: auto; }
.thumb-num {
  text-align: center;
  font-size: 12px;
  color: var(--muted);
  margin-top: 3px;
}

#viewer {
  flex: 1;
  min-width: 0;
  overflow: auto;
  position: relative;
  scroll-behavior: auto;
}
#viewer:focus { outline: none; }
#pages {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 22px 16px 80px;
  gap: 22px;
  min-width: max-content;
  margin: 0 auto;
}
#pages[hidden] { display: none; }
#viewer.drop-target { outline: 3px dashed var(--o500); outline-offset: -8px; }

.page {
  position: relative;
  background: #fff;
  box-shadow: 0 2px 10px #7c2d1233;
  flex-shrink: 0;
  user-select: none;
  -webkit-user-select: none;
}
.page.current { outline: 2px solid var(--o400); outline-offset: 4px; }
.page canvas.pc {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}
.page .placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: #bbb;
  font-size: 13px;
}
.page svg.ov {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
}
.page.tool-draw { cursor: crosshair; }
.page.tool-text { cursor: text; }
.page .ov [data-uid] { pointer-events: visiblePainted; }
.page.tool-select .ov [data-uid] { cursor: move; }
.page .txt {
  position: absolute;
  padding: 1px 2px;
  color: #111;
  white-space: pre;
  outline: none;
  min-width: 20px;
  min-height: 1em;
  border: 1px dashed transparent;
  line-height: 1.2;
  cursor: text;
}
.page .txt.sel { border-color: var(--o600); background: #fff8; }
.page .txt[contenteditable="true"]:focus { border-color: var(--o600); background: #fffbf5cc; }
.page .txt.dragging { cursor: move; }

.empty {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 24px;
  color: var(--muted);
}
.empty h2 { color: var(--ink); font-weight: 650; margin: 0 0 8px; }
.empty p { margin: 4px 0; }
.empty .fine, .fine { font-size: 12px; color: var(--muted); }
.empty-actions { display: flex; gap: 10px; margin: 16px 0 8px; flex-wrap: wrap; justify-content: center; }
.empty-actions button {
  min-height: 42px; padding: 9px 18px; border-radius: 8px;
  border: 1px solid var(--o300); background: #fff; color: var(--ink); font: 14px system-ui; cursor: pointer;
}
.empty-actions button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
#empty[hidden] { display: none; }

/* Status bar */
#statusbar {
  display: flex;
  gap: 18px;
  align-items: center;
  flex-wrap: wrap;
  padding: 6px 3%;
  font-size: 12px;
  color: var(--muted);
  background: var(--ribbon);
  border-top: 1px solid var(--ribbon-border);
}
#stat-dirty { color: var(--o700); font-weight: 600; }
:root[data-theme="dark"] #stat-dirty { color: var(--o300); }

/* Dialogs */
dialog {
  border: 1px solid var(--o300);
  border-radius: 12px;
  padding: 20px;
  width: min(560px, 94vw);
  background: #fff;
  color: var(--ink);
  box-shadow: 0 20px 50px #43140766;
}
dialog::backdrop { background: #431407aa; }
:root[data-theme="dark"] dialog { background: #2a150c; }
dialog h2 { margin: 0 0 12px; font-size: 18px; }
dialog label { display: block; font-size: 13px; color: var(--muted); margin: 8px 0 4px; }
dialog input[type="text"], dialog input:not([type]), #sigtext {
  width: 100%;
  min-height: 40px;
  padding: 8px 10px;
  border: 1px solid var(--o300);
  border-radius: 6px;
  font: 15px system-ui;
  background: #fff;
  color: var(--ink);
}
dialog select, #sigfont { min-height: 36px; padding: 6px 8px; border-radius: 6px; border: 1px solid var(--o300); }
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 16px; }
.dialog-actions button, .row button, .sig-panel button {
  min-height: 38px; padding: 8px 16px; border-radius: 7px;
  border: 1px solid var(--o300); background: #fff; color: var(--ink); cursor: pointer; font: 14px system-ui;
}
.dialog-actions button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.sig-tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--o200); margin-bottom: 12px; }
.sig-tabs button {
  appearance: none; border: 0; background: transparent; padding: 8px 12px;
  color: var(--muted); font: 600 14px system-ui; border-bottom: 3px solid transparent; cursor: pointer;
}
.sig-tabs button.selected { color: var(--accent); border-bottom-color: var(--o500); }
#sigpad, #sigtypecanvas {
  width: 100%;
  height: auto;
  aspect-ratio: 520 / 200;
  background: #fffdfb;
  border: 1px dashed var(--o400);
  border-radius: 8px;
  touch-action: none;
  display: block;
  margin-bottom: 8px;
}
.sig-panel input { margin-bottom: 8px; }
.sig-panel[hidden] { display: none; }
.check { display: flex !important; gap: 8px; align-items: center; margin-top: 12px !important; color: var(--ink) !important; }
#exporttext { color: var(--ink); }

/* Narrow screens: pages strip moves to the top */
@media (max-width: 800px) {
  header { padding: 10px 14px; }
  header h1 { font-size: 17px; }
  #filename { max-width: 40%; font-size: 12px; }
  #appstate, #statusbar { padding-left: 14px; padding-right: 14px; }
  #ribbon-tabs { padding: 0 9px; }
  #ribbon-tabs button { padding: 9px 11px; font-size: 12px; }
  #toolbar { padding: 8px 9px; position: sticky; top: 0; box-shadow: 0 2px 7px #7c2d1222; }
  #toolbar button, #toolbar select { min-height: 44px; font-size: 14px; }
  main { flex-direction: column; }
  #thumbs {
    width: 100%;
    height: auto;
    max-height: 124px;
    border-right: 0;
    border-bottom: 1px solid var(--ribbon-border);
    padding: 6px 8px;
  }
  #thumblist { flex-direction: row; overflow-x: auto; gap: 8px; }
  .thumb { width: 84px; flex-shrink: 0; }
  #pages { padding: 14px 10px 90px; }
  .tabs { padding-left: 9px; padding-right: 9px; }
  dialog { padding: 16px; }
}
@media (max-width: 800px) and (orientation: portrait) {
  #thumbs.hidden { display: none; }
}