* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-main);
  -webkit-font-smoothing: antialiased;
}

img,
svg,
canvas {
  max-width: 100%;
}

h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}
h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  letter-spacing: -0.03em;
}
button,
input,
textarea,
select {
  font: inherit;
}
button:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.annotation-toolbar {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
  flex-wrap: wrap;
}

.ann-tool-btn {
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.8rem;
}

.ann-tool-btn.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.color-swatches {
  display: flex;
  gap: 4px;
}

.color-swatch {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
}

.color-swatch.active {
  border-color: var(--text-primary);
}

.reader-body {
  display: flex;
  gap: var(--space-md);
  flex: 1;
  overflow: hidden;
}

.reader-canvas-container {
  flex: 1;
}

.annotations-panel {
  width: 260px;
  flex-shrink: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  overflow-y: auto;
}

.annotations-panel h4 {
  margin-bottom: var(--space-sm);
  font-size: 0.9rem;
}

.annotations-empty {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.annotation-panel-item {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 6px 0;
  border-bottom: 1px solid var(--border-color);
}

.annotation-swatch {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}

.annotation-panel-label {
  flex: 1;
  font-size: 0.78rem;
  color: var(--text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.annotation-panel-delete {
  background: transparent;
  border: none;
  cursor: pointer;
  opacity: 0.5;
  font-size: 0.75rem;
}

.annotation-panel-delete:hover {
  opacity: 1;
}

/* --- Layered canvas/text/sticky structure --- */
.pdf-page-wrapper {
  position: relative;
}

#pdf-canvas {
  position: absolute;
  top: 0;
  left: 0;
}

.annotation-canvas {
  position: absolute;
  top: 0;
  left: 0;
  pointer-events: none;
}

.textLayer {
  position: absolute;
  top: 0;
  left: 0;
  overflow: hidden;
  line-height: 1;
  pointer-events: none;
}

.textLayer span {
  color: transparent;
  position: absolute;
  white-space: pre;
  cursor: text;
  transform-origin: 0% 0%;
}

.textLayer ::selection {
  background: rgba(79, 70, 229, 0.35);
}

.sticky-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  cursor: crosshair;
}

.sticky-pin {
  position: absolute;
  transform: translate(-50%, -100%);
  background: none;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  pointer-events: auto;
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.3));
}