:root {
  color-scheme: light;
  --bg: #f2f2f5;
  --panel: #ffffff;
  --panel-2: #f8f8fa;
  --line: #ddddE3;
  --text: #17171a;
  --muted: #707078;
  --accent: #2f6fed;
  --accent-soft: #eaf1ff;
  --shadow: 0 10px 35px rgba(18, 20, 28, .12);
  --topbar-h: 58px;
  --toolbar-h: 64px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; background: var(--bg); color: var(--text); }
body { overflow: hidden; }
button, input { font: inherit; }
button { -webkit-tap-highlight-color: transparent; }
svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.9; stroke-linecap: round; stroke-linejoin: round; }

.app-shell { min-height: 100vh; display: grid; grid-template-rows: var(--topbar-h) var(--toolbar-h) minmax(0, 1fr); }
.topbar {
  display: grid;
  grid-template-columns: 1fr minmax(160px, 420px) 1fr;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  background: rgba(255,255,255,.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
  z-index: 20;
}
.topbar-left, .topbar-right { display: flex; align-items: center; gap: 8px; min-width: 0; }
.topbar-right { justify-content: flex-end; }
.document-title-wrap { min-width: 0; text-align: center; }
.document-title { font-size: 14px; font-weight: 650; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.save-state { margin-top: 2px; font-size: 11px; color: var(--muted); }

.primary-btn, .secondary-btn, .icon-btn, .tool-btn, .zoom-label {
  border: 0;
  border-radius: 11px;
  cursor: pointer;
  transition: background .12s ease, transform .08s ease, opacity .12s ease;
}
.primary-btn { min-height: 40px; padding: 0 16px; background: var(--accent); color: white; font-weight: 650; }
.primary-btn.large { min-height: 46px; padding: 0 22px; }
.secondary-btn { min-height: 40px; padding: 0 14px; background: var(--panel-2); color: var(--text); font-weight: 600; border: 1px solid var(--line); }
.icon-btn { width: 40px; height: 40px; display: inline-grid; place-items: center; background: transparent; color: var(--text); }
.icon-btn:hover, .zoom-label:hover { background: var(--panel-2); }
button:active:not(:disabled) { transform: scale(.97); }
button:disabled { cursor: default; opacity: .38; }

.toolstrip {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-width: none;
  z-index: 15;
}
.toolstrip::-webkit-scrollbar { display: none; }
.toolgroup { display: flex; align-items: center; flex: 0 0 auto; }
.segmented { padding: 4px; gap: 2px; background: var(--panel-2); border: 1px solid var(--line); border-radius: 14px; }
.tool-btn { min-height: 42px; padding: 0 12px; display: flex; align-items: center; gap: 7px; background: transparent; color: var(--muted); font-size: 13px; font-weight: 650; }
.tool-btn.active { background: var(--panel); color: var(--accent); box-shadow: 0 1px 5px rgba(0,0,0,.08); }
.compact { gap: 2px; border-left: 1px solid var(--line); padding-left: 10px; }
.colors { gap: 8px; padding: 0 4px; }
.color-btn { width: 28px; height: 28px; border-radius: 50%; border: 3px solid var(--panel); background: var(--swatch); box-shadow: 0 0 0 1px var(--line); cursor: pointer; }
.color-btn.active { box-shadow: 0 0 0 2px var(--accent); }
.width-control { display: flex; align-items: center; gap: 9px; color: var(--muted); font-size: 12px; white-space: nowrap; }
.width-control input { width: 92px; accent-color: var(--accent); }
.zoom-label { min-width: 60px; height: 40px; padding: 0 6px; background: transparent; font-size: 12px; font-weight: 650; color: var(--muted); }

.workspace { min-height: 0; display: grid; grid-template-columns: 174px minmax(0,1fr); }
.sidebar { min-width: 0; overflow-y: auto; padding: 12px 10px 24px; background: #e9e9ed; border-right: 1px solid var(--line); transition: width .16s ease, transform .16s ease; }
.sidebar-heading { padding: 4px 6px 10px; font-size: 12px; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.page-list { display: grid; gap: 12px; }
.page-item { width: 100%; padding: 7px; border: 0; border-radius: 12px; background: transparent; cursor: pointer; text-align: center; color: var(--muted); }
.page-item.active { background: rgba(255,255,255,.72); color: var(--accent); }
.thumb { position: relative; width: 100%; aspect-ratio: 0.707; overflow: hidden; border-radius: 5px; background: white; box-shadow: 0 2px 7px rgba(0,0,0,.11); }
.thumb canvas { width: 100%; height: 100%; display: block; object-fit: contain; }
.thumb-placeholder { position: absolute; inset: 0; display: grid; place-items: center; color: #aaa; font-size: 11px; }
.page-number { padding-top: 6px; font-size: 11px; font-weight: 650; }

.canvas-scroll { min-width: 0; min-height: 0; overflow: auto; overscroll-behavior: contain; position: relative; background: #d8d8dd; }
.empty-state { min-height: 100%; display: grid; place-items: center; align-content: center; text-align: center; padding: 40px 20px 80px; color: var(--text); }
.empty-icon { width: 74px; height: 74px; display: grid; place-items: center; border-radius: 21px; background: var(--panel); box-shadow: var(--shadow); color: var(--accent); }
.empty-icon svg { width: 34px; height: 34px; }
.empty-state h1 { margin: 22px 0 8px; font-size: clamp(22px, 4vw, 32px); letter-spacing: -.02em; }
.empty-state p { max-width: 500px; margin: 0 0 22px; color: var(--muted); line-height: 1.5; }
.feature-row { margin-top: 20px; display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; }
.feature-row span { padding: 7px 10px; border-radius: 999px; background: rgba(255,255,255,.7); color: var(--muted); font-size: 12px; }

.page-stage-wrap { min-width: 100%; min-height: 100%; padding: 28px 34px 60px; display: flex; justify-content: center; align-items: flex-start; }
.page-stage { position: relative; flex: 0 0 auto; background: white; box-shadow: var(--shadow); transform-origin: top center; }
.pdf-canvas, .ink-canvas { display: block; }
.pdf-canvas { position: relative; z-index: 1; background: white; }
.ink-canvas { position: absolute; inset: 0; z-index: 2; touch-action: pan-x pan-y pinch-zoom; }
.ink-canvas[data-tool="pen"], .ink-canvas[data-tool="highlighter"] { cursor: crosshair; }
.ink-canvas[data-tool="eraser"] { cursor: cell; }
.render-badge { position: absolute; right: 12px; bottom: 12px; z-index: 5; padding: 7px 9px; border-radius: 999px; background: rgba(30,30,34,.74); color: white; font-size: 11px; backdrop-filter: blur(8px); pointer-events: none; }
.toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); z-index: 50; padding: 10px 14px; border-radius: 999px; background: rgba(24,24,27,.88); color: white; font-size: 13px; box-shadow: 0 6px 24px rgba(0,0,0,.2); }

body.sidebar-collapsed .workspace { grid-template-columns: 0 minmax(0,1fr); }
body.sidebar-collapsed .sidebar { width: 0; padding-left: 0; padding-right: 0; border-right: 0; overflow: hidden; }

@media (max-width: 760px) {
  :root { --topbar-h: 54px; --toolbar-h: 60px; }
  .topbar { grid-template-columns: auto 1fr auto; padding: 7px 8px; }
  .secondary-btn { display: none; }
  .document-title-wrap { text-align: left; padding-left: 2px; }
  .tool-btn span, .width-control span { display: none; }
  .tool-btn { width: 42px; justify-content: center; padding: 0; }
  .workspace { grid-template-columns: 0 minmax(0,1fr); }
  .sidebar { position: absolute; top: calc(var(--topbar-h) + var(--toolbar-h)); bottom: 0; left: 0; width: 160px; transform: translateX(-100%); z-index: 30; box-shadow: 8px 0 24px rgba(0,0,0,.16); }
  body.sidebar-open .sidebar { transform: translateX(0); }
  .page-stage-wrap { padding: 18px 14px 50px; }
  .width-control input { width: 78px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}

/* Respect the HTML hidden attribute even when a component has its own display rule. */
[hidden] { display: none !important; }