:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --panel: #ffffff;
  --line: #d8dee8;
  --ink: #101827;
  --ink-muted: #4b5565;
  --term-hover-bg: rgba(46, 125, 220, 0.17);
  --card-radius: 10px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--ink);
  background: var(--bg);
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
  padding: 12px 16px;
}

.app-header h1 {
  margin: 0 0 4px;
  font-size: 1.1rem;
}

.app-header p {
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.9rem;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 370px;
  gap: 14px;
  padding: 14px;
}

.viewer-panel {
  min-width: 0;
}

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}

.toolbar button,
.nav-buttons button {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 0.9rem;
  cursor: pointer;
}

.toolbar button:hover,
.nav-buttons button:hover {
  border-color: #99a6bc;
}

#input-summary {
  color: var(--ink-muted);
  font-size: 0.82rem;
  text-align: right;
}

#pdf-container {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.pdf-page {
  position: relative;
  margin: 0 auto;
  box-shadow: 0 10px 28px rgba(16, 24, 39, 0.12);
  border-radius: 4px;
  overflow: hidden;
  background: #fff;
}

.pdf-canvas {
  display: block;
}

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

.match-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 4;
}

.term-hitbox {
  position: absolute;
  background: transparent;
  border-radius: 1px;
  cursor: pointer;
  pointer-events: auto;
  transition: background-color 120ms ease;
}

.term-hitbox.hovered {
  background: var(--term-hover-bg);
}

.term-hitbox.active {
  background: rgba(46, 125, 220, 0.24);
}

.details-panel {
  position: sticky;
  top: 72px;
  height: calc(100vh - 86px);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.card {
  border: 1px solid var(--line);
  border-radius: var(--card-radius);
  background: var(--panel);
  padding: 12px;
}

.card h2 {
  margin: 0 0 10px;
  font-size: 1rem;
}

.empty-state {
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.9rem;
}

.hidden {
  display: none;
}

#coverage-preview {
  margin: 0;
  white-space: pre-wrap;
  font-size: 0.82rem;
  color: var(--ink);
}

#artifact-list {
  margin: 0;
  padding-left: 18px;
}

#artifact-list li {
  margin: 6px 0;
}

#artifact-list a {
  color: #0b5ed7;
  text-decoration: none;
}

#artifact-list a:hover {
  text-decoration: underline;
}

.term-popup {
  position: fixed;
  z-index: 30;
  width: min(430px, calc(100vw - 16px));
  max-height: min(300px, calc(100vh - 20px));
  overflow-y: auto;
  background: #efeff0;
  border: 1px solid #c9ced6;
  border-radius: 10px;
  box-shadow: 0 10px 28px rgba(16, 24, 39, 0.22);
  color: #2b2f36;
  padding: 8px 10px;
  pointer-events: auto;
  font-size: 12px;
  line-height: 1.3;
  will-change: transform, left, top;
}

.term-popup::after {
  content: "";
  position: absolute;
  left: calc(var(--arrow-x, 24px) - 5px);
  width: 10px;
  height: 10px;
  background: #efeff0;
}

.term-popup.popup-above::after {
  bottom: -6px;
  border-right: 1px solid #c9ced6;
  border-bottom: 1px solid #c9ced6;
  transform: rotate(45deg);
}

.term-popup.popup-below::after {
  top: -6px;
  border-left: 1px solid #c9ced6;
  border-top: 1px solid #c9ced6;
  transform: rotate(45deg);
}

.term-popup-content {
  margin: 0;
}

.term-popup-content dt {
  margin: 8px 0 2px;
  font-size: 10px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #5a6472;
  font-weight: 600;
}

.term-popup-content dd {
  margin: 0;
  font-size: 12px;
  line-height: 1.32;
}

@media (max-width: 1024px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .details-panel {
    position: static;
    height: auto;
  }
}