:root {
  color-scheme: light;
  --ink: #1d252b;
  --muted: #697780;
  --line: #d6e0e4;
  --panel: rgba(248, 251, 252, 0.84);
  --accent: #1e7b8f;
  --accent-strong: #155967;
  --good: #21865b;
  --ui-border: #17282f;
  --ui-shadow: rgba(23, 40, 47, 0.16);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  height: 100vh;
  height: 100dvh;
  min-height: 100vh;
  background: #eef3f5;
  color: var(--ink);
  font-family:
    "Segoe UI",
    "Malgun Gothic",
    system-ui,
    sans-serif;
  overflow: hidden;
}

button,
input {
  font: inherit;
}

.app,
.lab,
.scene {
  width: 100%;
  height: 100vh;
  height: 100dvh;
  min-height: 0;
}

.lab {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 24% 12%, rgba(255, 255, 255, 0.7), transparent 28%),
    linear-gradient(145deg, #dfe9ed, #eef4f6 52%, #cfdde2);
}

.scene,
.scene canvas {
  touch-action: none;
}

.lesson-chooser {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.82), rgba(218, 232, 237, 0.82)),
    radial-gradient(circle at 50% 26%, #ffffff 0, #edf5f7 34%, #cadde3 100%);
}

.lesson-chooser.is-hidden {
  display: none;
}

.lesson-panel {
  width: min(620px, 100%);
  padding: 28px;
  border: 4px solid #17282f;
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(244, 249, 250, 0.96));
  box-shadow:
    12px 12px 0 rgba(23, 40, 47, 0.18),
    0 28px 80px rgba(27, 47, 56, 0.26);
}

.lesson-panel h1 {
  margin: 0 0 22px;
  color: #17282f;
  font-size: 30px;
  line-height: 1.15;
  text-align: center;
}

.lesson-grid {
  display: grid;
  gap: 14px;
}

.lesson-button {
  display: grid;
  gap: 6px;
  min-height: 82px;
  padding: 15px 18px;
  border: 3px solid #17282f;
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  text-align: center;
  cursor: pointer;
  box-shadow: 6px 6px 0 rgba(23, 40, 47, 0.12);
  transition:
    background-color 140ms ease,
    border-color 140ms ease,
    transform 140ms ease,
    box-shadow 140ms ease;
}

.lesson-button:hover,
.lesson-button:focus-visible {
  border-color: var(--accent-strong);
  background: #f3fbfd;
  box-shadow:
    9px 9px 0 rgba(21, 89, 103, 0.16),
    0 14px 30px rgba(22, 82, 96, 0.16);
  transform: translate(-2px, -2px);
}

.lesson-button strong {
  color: #17282f;
  font-size: 20px;
  line-height: 1.1;
}

.lesson-button span {
  color: var(--muted);
  font-weight: 700;
}

.specimen-picker,
.scope-controls {
  position: fixed;
  right: 16px;
  z-index: 60;
  border: 3px solid var(--ui-border);
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(244, 249, 250, 0.96));
  box-shadow:
    7px 7px 0 var(--ui-shadow),
    0 18px 42px rgba(27, 47, 56, 0.18);
}

.specimen-picker {
  top: 16px;
  width: min(360px, calc(100vw - 32px));
  padding: 14px;
}

.specimen-picker h2 {
  margin: 0 0 12px;
  color: var(--ui-border);
  font-size: 16px;
  text-align: center;
}

.specimen-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.specimen-button {
  min-height: 48px;
  padding: 9px 10px;
  border: 2px solid var(--ui-border);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  text-align: center;
  cursor: pointer;
  box-shadow: 4px 4px 0 rgba(23, 40, 47, 0.11);
  transition:
    background-color 140ms ease,
    border-color 140ms ease,
    transform 140ms ease,
    box-shadow 140ms ease;
}

.specimen-button:hover,
.specimen-button:focus-visible {
  border-color: var(--accent-strong);
  background: #f3fbfd;
  box-shadow:
    6px 6px 0 rgba(21, 89, 103, 0.15),
    0 10px 22px rgba(22, 82, 96, 0.14);
  transform: translate(-1px, -1px);
}

.specimen-button[aria-pressed="true"] {
  border-color: var(--accent-strong);
  background: #eaf7fa;
  box-shadow:
    4px 4px 0 rgba(21, 89, 103, 0.2),
    inset 0 0 0 2px rgba(30, 123, 143, 0.18);
}

.specimen-button.is-complete {
  border-color: var(--good);
  background: #f0fbf5;
}

.specimen-button strong {
  display: block;
}

.specimen-button strong {
  font-size: 14px;
}

.specimen-button span {
  display: block;
  margin-top: 3px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  line-height: 1.25;
}

.scope-controls {
  bottom: 16px;
  display: grid;
  gap: 12px;
  width: min(360px, calc(100vw - 32px));
  padding: 14px;
}

.slider-row {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) 76px;
  align-items: center;
  gap: 10px;
  min-height: 34px;
}

.slider-row span {
  color: var(--ui-border);
  font-weight: 800;
  text-align: center;
}

input[type="range"] {
  height: 18px;
  accent-color: var(--accent);
  cursor: pointer;
}

input[type="range"]:disabled {
  cursor: default;
  opacity: 0.45;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 10px;
  border: 2px solid var(--ui-border);
  border-radius: 999px;
  background: #ffffff;
  box-shadow: inset 0 1px 0 rgba(23, 40, 47, 0.08);
}

input[type="range"]::-webkit-slider-thumb {
  width: 22px;
  height: 22px;
  margin-top: -8px;
  border: 3px solid var(--ui-border);
  border-radius: 50%;
  background: #f3fbfd;
  box-shadow: 3px 3px 0 rgba(23, 40, 47, 0.14);
  appearance: none;
}

input[type="range"]::-moz-range-track {
  height: 10px;
  border: 2px solid var(--ui-border);
  border-radius: 999px;
  background: #ffffff;
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border: 3px solid var(--ui-border);
  border-radius: 50%;
  background: #f3fbfd;
  box-shadow: 3px 3px 0 rgba(23, 40, 47, 0.14);
}

output {
  min-height: 28px;
  padding: 3px 6px;
  border: 2px solid var(--ui-border);
  border-radius: 8px;
  background: #fff;
  color: var(--ui-border);
  font-weight: 800;
  text-align: center;
  box-shadow: 3px 3px 0 rgba(23, 40, 47, 0.1);
}

.eyepiece-observe-prompt {
  position: absolute;
  left: 50%;
  top: 50%;
  z-index: 20;
  max-width: min(270px, calc(100% - 32px));
  min-height: 44px;
  padding: 11px 15px;
  border: 3px solid var(--ui-border);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.96);
  color: var(--ui-border);
  cursor: pointer;
  font-size: 15px;
  font-weight: 800;
  text-align: center;
  box-shadow:
    7px 7px 0 rgba(23, 40, 47, 0.16),
    0 18px 42px rgba(27, 47, 56, 0.22);
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, calc(-100% - 16px)) scale(0.96);
  transition:
    opacity 180ms ease,
    transform 180ms ease;
  white-space: nowrap;
}

.eyepiece-observe-prompt.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, calc(-100% - 22px)) scale(1);
}

.eyepiece-observe-prompt:hover,
.eyepiece-observe-prompt:focus-visible {
  background: #f3fbfd;
  outline: none;
  box-shadow:
    9px 9px 0 rgba(21, 89, 103, 0.16),
    0 18px 42px rgba(27, 47, 56, 0.22);
}

.lab-scope-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  padding: 16px;
  background: #050708;
  opacity: 0;
  pointer-events: none;
  transform: scale(1.01);
  transition:
    opacity 260ms ease,
    transform 260ms ease;
}

.lab-scope-overlay.is-open {
  opacity: 1;
  pointer-events: auto;
  transform: scale(1);
}

.overlay-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 54px;
  margin-bottom: 12px;
  padding: 12px 14px;
  padding-right: min(380px, calc(100vw - 32px));
  border: 3px solid rgba(255, 255, 255, 0.82);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  box-shadow:
    7px 7px 0 rgba(255, 255, 255, 0.08),
    0 16px 38px rgba(0, 0, 0, 0.28);
}

.overlay-bar span,
.overlay-bar strong {
  display: block;
}

.overlay-bar span {
  color: rgba(255, 255, 255, 0.72);
  font-size: 14px;
  text-align: center;
}

.overlay-bar strong {
  font-size: 22px;
  text-align: center;
}

.overlay-bar button {
  min-width: 94px;
  min-height: 40px;
  border: 3px solid rgba(255, 255, 255, 0.82);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.16);
  color: #fff;
  cursor: pointer;
  font-weight: 800;
  box-shadow: 4px 4px 0 rgba(255, 255, 255, 0.08);
}

.overlay-bar button:hover,
.overlay-bar button:focus-visible {
  background: rgba(255, 255, 255, 0.24);
  transform: translate(-1px, -1px);
}

#fullScopeCanvas {
  display: block;
  width: min(100vw, 100vh);
  height: min(100vw, 100vh);
  justify-self: center;
  align-self: center;
  border: 4px solid rgba(255, 255, 255, 0.82);
  border-radius: 8px;
  background: #101719;
  box-shadow:
    10px 10px 0 rgba(255, 255, 255, 0.08),
    0 24px 80px rgba(0, 0, 0, 0.55);
}

.lab-scope-overlay::after {
  position: absolute;
  inset: 72px 16px 16px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  content: "";
  pointer-events: none;
}

@media (max-width: 720px) {
  .specimen-picker,
  .scope-controls {
    left: 12px;
    right: 12px;
    width: auto;
  }

  .specimen-picker {
    top: 12px;
  }

  .scope-controls {
    bottom: 12px;
  }

  .overlay-bar {
    padding-right: 0;
  }
}