:root {
    --bg: #0b0f14;
    --panel: #0f1720;
    --ink: #e7eef7;
    --muted: #8aa1ba;
    --accent: #4fa3ff;
    --accent-2: #6fdb8a;
    --danger: #ff6b6b;
    --border: #1f2a39;
  }
  
  * { box-sizing: border-box; }
  html, body { height: 100%; }
  body {
    margin: 0;
    font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
    background: var(--bg);
    color: var(--ink);
    display: grid;
    grid-template-rows: auto 1fr;
  }
  
  header {
    display: flex; align-items: center; gap: .75rem; padding: .75rem 1rem;
    border-bottom: 1px solid var(--border);
    background: linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,0));
    position: sticky; top: 0; z-index: 10;
  }
  
  header .brand { font-weight: 700; letter-spacing: .3px; }
  
  .toolbar { display: flex; gap: .5rem; flex-wrap: wrap; align-items: center; }
  
  .btn, label.btn {
    background: #131c28; color: var(--ink); border: 1px solid var(--border);
    padding: .45rem .7rem; border-radius: .6rem; cursor: pointer; font-size: .9rem;
  }
  .btn:hover { border-color: var(--accent); }
  .btn.primary { background: var(--accent); color: #001326; border-color: transparent; }
  .btn.success { background: var(--accent-2); color: #03160a; border-color: transparent; }
  .btn.danger { background: var(--danger); color: white; border-color: transparent; }
  
  .select, .num, input[type="color"] {
    background: #0d1520; color: var(--ink); border: 1px solid var(--border);
    padding: .35rem .5rem; border-radius: .45rem; font-size: .9rem;
  }
  input[type="color"] { width: 40px; height: 30px; padding: 0; }
  
  main {
    display: grid; grid-template-columns: 280px 1fr; gap: 12px; padding: 12px;
    height: calc(100vh - 64px);
  }
  
  /* Sidebar */
  .sidebar {
    background: var(--panel); border: 1px solid var(--border); border-radius: .9rem;
    display: grid; grid-template-rows: auto 1fr auto; overflow: hidden;
  }
  .sidebar h3 { margin: 0; padding: .8rem 1rem; border-bottom: 1px solid var(--border); font-size: .95rem; color: var(--muted); }
  
  .thumbs { overflow: auto; padding: .75rem; display: grid; gap: .75rem; }
  .thumb { position: relative; background: #0d1520; border: 1px solid var(--border); border-radius: .6rem; padding: .5rem; cursor: grab; }
  .thumb canvas { width: 100%; height: auto; display: block; background: white; }
  .thumb.active { outline: 2px solid var(--accent); }
  
  .sidebar .actions { padding: .75rem; border-top: 1px solid var(--border); display: grid; gap: .5rem; }
  
  /* Stage */
  .stage-wrap {
    background: var(--panel); border: 1px solid var(--border); border-radius: .9rem; padding: .75rem;
    display: grid; grid-template-rows: auto 1fr auto; overflow: hidden;
  }
  .stage-toolbar { display: flex; gap: .5rem; align-items: center; border-bottom: 1px solid var(--border); padding: .5rem; }
  .stage {
    overflow: auto; display: grid; place-items: start center; padding: .75rem; position: relative;
  }
  .stage-footer {
    display: flex; gap: .5rem; align-items: center; padding: .5rem; border-top: 1px solid var(--border);
  }
  .page-wrap { position: relative; }
  canvas#pageCanvas { background: white; display: block; }
  .overlay { position: absolute; inset: 0; pointer-events: none; }
  
  /* Annotation items */
  .ann { position: absolute; pointer-events: auto; }
  .ann.selected { outline: 2px dashed var(--accent); outline-offset: 2px; }
  
  .ann.rect { background: transparent; }
  
  .ann.text { min-width: 60px; min-height: 24px; padding: 4px 6px; border: 1px dashed #333; background: rgba(255,255,255,.85); color: #111; }
  .ann.text[contenteditable="true"]:focus { outline: none; }
  
  .ann img { display: block; max-width: 100%; max-height: 100%; }
  
  .hint { color: var(--muted); font-size: .9rem; }
  
  .hidden { display: none !important; }
  
  @media (max-width: 900px) {
    main { grid-template-columns: 1fr; grid-template-rows: 240px 1fr; }
    .sidebar { order: 2; }
    .stage-wrap { order: 1; }
  }

.ann.pdf-text {
  border: 1px solid var(--accent);
  background: rgba(255, 255, 255, 0.5);
  padding: 2px 4px;
  color: #111;
}
.ann.pdf-text[contenteditable="true"]:focus {
  outline: none;
  background: rgba(255, 255, 255, 0.9);
}