body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: #f3f3f3;
  overflow: hidden;
  color: #16181d;
}

* {
  scrollbar-width: thin;
  scrollbar-color: #adb9cf #e6e9f0;
}

*::-webkit-scrollbar {
  width: 12px;
  height: 12px;
}

*::-webkit-scrollbar-track {
  background: #e6e9f0;
}

*::-webkit-scrollbar-thumb {
  border-radius: 999px;
  border: 3px solid #e6e9f0;
  background: #adb9cf;
}

.container {
  display: flex;
  height: 100vh;
}

.main-viewers {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
}

/* SIDEBAR */
.sidebar {
  width: 140px;
  background: #ffffff;
  border-right: 1px solid #ddd;
  display: flex;
  flex-direction: column;
}

#thumbnails {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.thumbnail {
  margin-bottom: 10px;
  cursor: pointer;
  border: 2px solid transparent;
  border-radius: 4px;
  position: relative;
  overflow: hidden;
}

.thumbnail.active {
  border-color: #4f6ef7;
  box-shadow: 0 0 0 2px rgba(79, 110, 247, 0.3);
}

.thumbnail canvas {
  width: 100%;
  display: block;
}

.thumbnail-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.55);
  color: #fff;
  font-size: 11px;
  text-align: center;
  padding: 2px 0;
  pointer-events: none;
}

.page-indicator {
  padding: 10px;
  border-top: 1px solid #ddd;
  display: flex;
  justify-content: center;
  gap: 4px;
  font-size: 14px;
}

.page-indicator input {
  width: 50px;
  text-align: center;
}

/* VIEWER */
.viewer-wrapper {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: 20px;
  min-width: 0;
  transition: flex-basis 260ms ease, padding-left 260ms ease;
}

.answers-wrapper {
  flex: 0 0 0;
  width: 0;
  overflow: hidden;
  position: relative;
  padding: 20px 10px 20px 20px;
  border-right: 1px solid #ddd;
  opacity: 0;
  transform: translateX(-24px);
  pointer-events: none;
  transition:
    flex-basis 280ms ease,
    width 280ms ease,
    opacity 220ms ease,
    transform 280ms ease,
    padding 280ms ease;
}

.container.show-answers .answers-wrapper {
  width: 50%;
  flex: 1 1 50%;
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
}

.container.show-answers .viewer-wrapper {
  flex: 1 1 50%;
}

.answers-zoom-controls {
  position: absolute;
  right: 20px;
  bottom: 20px;
  z-index: 5;
  display: none;
  gap: 10px;
  background: white;
  padding: 10px;
  border-radius: 50px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}

.container.show-answers .answers-zoom-controls {
  display: flex;
}

#answersViewer {
  height: 100%;
  overflow-y: auto;
  padding: 0 0 96px;
}

.pdf-page {
  display: flex;
  justify-content: center;
  margin-bottom: 20px;
}

.answer-page {
  position: relative;
}

.answer-match-dot {
  position: absolute;
  left: 12px;
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: #4f6ef7;
  pointer-events: none;
  box-shadow:
    0 0 0 5px rgba(79, 110, 247, 0.2),
    0 0 14px 4px rgba(79, 110, 247, 0.75);
  transform: translate(-50%, -50%);
}

canvas {
  box-shadow: 0 3px 12px rgba(0,0,0,0.15);
}

/* FLOATING CONTROLS */
.floating {
  position: fixed;
  bottom: 20px;
  display: flex;
  gap: 10px;
  background: white;
  padding: 10px;
  border-radius: 50px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}

.zoom-controls {
  right: 20px;
}

.actions {
  left: 160px;
}

button {
  cursor: pointer;
  border: none;
  background: #f0f0f0;
  padding: 8px 12px;
  border-radius: 20px;
}

button:hover {
  background: #ddd;
}

#answerBtn.active {
  background: #4f6ef7;
  color: #fff;
}

body.dark-mode {
  background: #111722;
  color: #dee7f6;
}

body.dark-mode * {
  scrollbar-color: #4f6388 #121a2a;
}

body.dark-mode *::-webkit-scrollbar-track {
  background: #121a2a;
}

body.dark-mode *::-webkit-scrollbar-thumb {
  border-color: #121a2a;
  background: #4f6388;
}

body.dark-mode .sidebar {
  background: #182234;
  border-right-color: #273954;
}

body.dark-mode .page-indicator {
  border-top-color: #273954;
}

body.dark-mode .page-indicator input {
  background: #0f1726;
  color: #dfe8f8;
  border: 1px solid #324766;
}

body.dark-mode .answers-wrapper {
  border-right-color: #273954;
}

body.dark-mode .floating,
body.dark-mode .answers-zoom-controls {
  background: #1b263a;
  box-shadow: 0 8px 22px rgba(2, 8, 18, 0.45);
}

body.dark-mode button {
  background: #243550;
  color: #e6efff;
}

body.dark-mode button:hover {
  background: #2c4466;
}

body.dark-mode .thumbnail.active {
  border-color: #70a9ff;
  box-shadow: 0 0 0 2px rgba(112, 169, 255, 0.35);
}

body.dark-mode canvas {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
}

body.invert-pdfs #viewer canvas,
body.invert-pdfs #answersViewer canvas {
  filter: invert(1) hue-rotate(180deg);
}