:root {
  --bg: #faf8f4;
  --surface: #f0ece4;
  --surface2: #e5e0d6;
  --border: #cec7b8;
  --text: #2a2520;
  --text-dim: #78706a;
  --accent: #486080;
  --accent-dim: #94a8be;
  --accent-bg: #eaecf0;
  --warn: #b07228;
  --warn-bg: #f6eddf;
  --error: hsl(4 22% 22%);
  --error-bg: hsl(0 30% 55% / .18);
  --error-border: hsl(0 35% 40% / .5);
  --inlet: #506878;
  --outlet: #8a5530;
  --correct: hsl(160 28% 22%);
  --correct-bg: hsl(117 30% 55% / .18);
  --correct-border: hsl(117 35% 35% / .5);
  --instruction-bg-highlight: #ede4d4;
  --box-shadow-sm: 0 .05rem .15rem rgba(40, 30, 20, .07),
    0 .05rem .1rem rgba(40, 30, 20, .05);
  --box-shadow-md: 0 .25rem .75rem rgba(40, 30, 20, .08),
    0 .1rem .25rem rgba(40, 30, 20, .05);
  --box-shadow-lg: 0 .5rem 1.5rem rgba(40, 30, 20, .10),
    0 .25rem .5rem rgba(40, 30, 20, .05);
  --dur-fast: 120ms;
  --dur-normal: 200ms;
  --text-xs: clamp(0.75rem, 0.7rem + 0.2vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.82rem + 0.25vw, 1.0625rem);
  --text-base: clamp(1rem, 0.92rem + 0.35vw, 1.1875rem);
  --text-lg: clamp(1.0625rem, 0.95rem + 0.45vw, 1.3125rem);
  --text-xl: clamp(1.125rem, 1rem + 0.5vw, 1.4375rem);
  --text-2xl: clamp(1.5rem, 1.2rem + 1vw, 2.25rem);
  --mono: ui-monospace, 'Cascadia Code', 'SF Mono', 'Fira Code', Consolas, 'Liberation Mono', Menlo, monospace;
  --serif: Charter, 'Bitstream Charter', 'Sitka Text', Cambria, Georgia, serif;
  --sans: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --display: Palatino, 'Palatino Linotype', 'Book Antiqua', Georgia, serif;
  font-size: 20px;
  -webkit-text-size-adjust: 100%;
  --pri-brown: hsl(25, 50%, 35%);
  --pri-brown-bg: hsla(25, 50%, 35%, 0.4);
  --pri-red: hsl(0, 60%, 45%);
  --pri-red-bg: hsla(0, 60%, 45%, 0.4);
  --pri-green-family: hsl(140, 45%, 38%);
  --pri-green-family-bg: hsla(140, 45%, 38%, 0.4);
  --pri-orange: hsl(35, 80%, 48%);
  --pri-orange-bg: hsla(35, 80%, 48%, 0.4);
  --pri-violet: hsl(270, 40%, 48%);
  --pri-violet-bg: hsla(270, 40%, 48%, 0.4);
  --pri-yellow: hsl(50, 70%, 48%);
  --pri-yellow-bg: hsla(50, 70%, 48%, 0.4);
  --pri-neutral: hsl(0, 0%, 62%);
  --pri-neutral-bg: hsla(0, 0%, 62%, 0.4);
}

.pri-brown { --pri-fg: var(--pri-brown); --pri-bg: var(--pri-brown-bg); }
.pri-red { --pri-fg: var(--pri-red); --pri-bg: var(--pri-red-bg); }
.pri-green-family { --pri-fg: var(--pri-green-family); --pri-bg: var(--pri-green-family-bg); }
.pri-orange { --pri-fg: var(--pri-orange); --pri-bg: var(--pri-orange-bg); }
.pri-violet { --pri-fg: var(--pri-violet); --pri-bg: var(--pri-violet-bg); }
.pri-yellow { --pri-fg: var(--pri-yellow); --pri-bg: var(--pri-yellow-bg); }
.pri-neutral { --pri-fg: var(--pri-neutral); --pri-bg: var(--pri-neutral-bg); }

@media (prefers-color-scheme: dark) {

  :root {
    --bg: #1c1917;
    --surface: #27231f;
    --surface2: #322d27;
    --border: #443d34;
    --text: #e5ddd4;
    --text-dim: #8a7e72;
    --accent: #5ab0be;
    --accent-dim: #2a5a64;
    --accent-bg: #1a2c30;
    --warn: #d49540;
    --warn-bg: #2a2218;
    --error: #d05050;
    --error-bg: #2a1818;
  --error-border: hsl(0 35% 40% / .5);    --inlet: #5ea8d4;
    --outlet: #d4815e;
    --correct: #72b89a;
    --correct-bg: #1c2824;
  --correct-border: hsl(117 35% 35% / .5);    --instruction-bg-highlight: #3a3228;
    --box-shadow-sm: 0 .05rem .15rem rgba(0, 0, 0, .2),
      0 .05rem .1rem rgba(0, 0, 0, .15);
    --box-shadow-md: 0 .25rem .75rem rgba(0, 0, 0, .25),
      0 .1rem .25rem rgba(0, 0, 0, .15);
    --box-shadow-lg: 0 .5rem 1.5rem rgba(0, 0, 0, .3),
      0 .25rem .5rem rgba(0, 0, 0, .15);
  }
}

*,*::before,*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--serif);
  line-height: 1.65;
  min-height: 100vh;
  font-size: var(--text-base);
}

button {
  font-family: inherit;
  cursor: pointer;
}

input,select,textarea {
  font-family: inherit;
  font-size: var(--text-sm);
}

ul,ol,menu {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
}

abbr {
  text-decoration: underline dotted;
}

nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  padding: 0 .75rem;
}

.subtab-row {
  display: none;
  gap: 0;
  width: 100%;
  background: var(--surface2);
  border-top: 1px solid var(--border);
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  list-style: none;
  padding: 0;
  margin: 0;
}

.subtab-row.activeTab {
  display: flex;
}

#nav-tabs {
  display: flex;
  overflow: visible;
  list-style: none;
  padding: 0;
  margin: 0;
}

@media (max-width: 600px) {

  #nav-tabs {
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
    mask-image: linear-gradient(to right, black calc(100% - 2rem), transparent);
    -webkit-mask-image: linear-gradient(to right, black calc(100% - 2rem), transparent);
  }

  #nav-tabs.scrolled-end {
    mask-image: none;
    -webkit-mask-image: none;
  }

  #nav-tabs::-webkit-scrollbar {
    display: none;
  }
}

#nav-tabs > li {
  list-style: none;
}


.nav-tab {
  font-family: var(--mono);
  font-size: var(--text-xs);
  background: none;
  border: none;
  color: var(--text-dim);
  padding: 0.5rem .75rem;
  white-space: nowrap;
  transition: all var(--dur-normal);
  text-decoration: none;
  cursor: pointer;
  display: block;
}

.nav-tab:hover {
  color: var(--text);
}

.nav-tab.activeTab {
  color: var(--accent);
  background: var(--bg);
  box-shadow: inset 0 -2px 0 var(--accent);
  font-weight: 600;
}

.location-bar {
  display: none;
  font-family: var(--mono);
  font-size: var(--text-xs);
  color: var(--text-dim);
  background: var(--surface);
  padding: .25rem .75rem;
  border-bottom: 1px solid var(--border);
}

@media (max-width: 600px) {
  .location-bar:not(.hidden) {
    display: block;
  }
}

.location-sep {
  margin: 0 .25rem;
}

main {
  max-width: 1160px;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}

main:has(#anatomy-content.activeTab) {
  max-width: none;
}


section.content {
  display: none;
}

section.content.activeTab {
  display: block;
  animation: fadeIn var(--dur-normal) ease-out;
}

.tab-section {
  margin-bottom: 2.5rem;
}

.section-title {
  font-family: var(--display);
  font-size: var(--text-xl);
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 1.2rem;
  border-left: 3px solid var(--accent);
  padding-left: .7rem;
  letter-spacing: -.01em;
}

.subsection-title {
  font-family: var(--display);
  font-size: var(--text-sm);
  color: var(--warn);
  font-weight: 600;
  margin-bottom: .8rem;
  margin-top: 1.5rem;
  border-left: 2px solid var(--warn);
  padding-left: .5rem;
}

.subview-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin-bottom: 1rem;
}

.subview-tab {
  font-family: var(--mono);
  font-size: var(--text-xs);
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: .4rem .8rem;
  border-radius: .25rem;
  cursor: pointer;
  transition: all var(--dur-fast);
}

.subview-tab.activeTab {
  background: var(--accent-bg);
  border-color: var(--accent);
  color: var(--accent);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit,minmax(280px,1fr));
  gap: 1rem;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

th {
  font-family: var(--mono);
  font-size: var(--text-xs);
  color: var(--text-dim);
  text-align: left;
  padding: .5rem .75rem;
  border-bottom: 2px solid var(--border);
  background: var(--surface);
  white-space: nowrap;
}

td {
  padding: .5rem .75rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
  line-height: 1.5;
}

tr:last-child td {
  border-bottom: none;
}

.table-card-mobile .table-row-card {
  display: none;
}

@media (max-width: 600px) {

  .table-card-mobile table {
    display: none;
  }

  .table-card-mobile .table-row-card {
    display: block;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: .4rem;
    padding: .75rem;
    margin-bottom: .75rem;
    box-shadow: var(--box-shadow-sm);
  }

  .table-row-card .trc-field {
    display: flex;
    flex-direction: column;
    margin-bottom: .5rem;
  }

  .table-row-card .trc-label {
    font-family: var(--mono);
    font-size: var(--text-xs);
    color: var(--text-dim);
    text-transform: uppercase;
  }

  .table-row-card .trc-val {
    font-size: var(--text-sm);
  }
}

.hidden {
  display: none!important;
}

.text-dim {
  color: var(--text-dim);
}

.text-accent {
  color: var(--accent);
}

.text-warn {
  color: var(--warn);
}


.text-inlet {
  color: var(--inlet);
}

.text-outlet {
  color: var(--outlet);
}

.text-correct {
  color: var(--correct);
}


.mono {
  font-family: var(--mono);
}

.bold {
  font-weight: 700;
}

p {
  margin-bottom: .6rem;
}

p:last-child {
  margin-bottom: 0;
}

.subtab-row::-webkit-scrollbar {
  display: none;
}

.subtab {
  font-family: var(--mono);
  font-size: var(--text-xs);
  background: none;
  border: none;
  color: var(--text-dim);
  padding: .35rem .6rem;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: all var(--dur-normal);
  text-decoration: none;
  cursor: pointer;
}

.subtab:hover {
  color: var(--text);
}

.subtab.activeTab {
  color: var(--accent);
  border-bottom-color: var(--accent);
  font-weight: 700;
  background-color: var(--bg);
}

.subtab-content {
  display: none;
}

.subtab-content.activeTab {
  display: block;
  animation: fadeIn var(--dur-normal) ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: .5rem;
  padding: 1.25rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--box-shadow-sm);
}

.card-label {
  font-family: var(--mono);
  font-size: var(--text-xs);
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: .07em;
  margin-bottom: .4rem;
}

.callout {
  background: var(--surface2);
  border-left: 4px solid var(--accent);
  border-radius: 0 .4rem .4rem 0;
  padding: 1rem 1.2rem;
  font-size: var(--text-sm);
  line-height: 1.7;
  margin-bottom: 1.25rem;
}

.callout.warn {
  border-left-color: var(--warn);
}

.callout.error {
  border-left-color: var(--error-border);
}

.callout p:last-child {
  margin-bottom: 0;
}

.tab-loading {
  display: flex;
  flex-direction: column;
  gap: .75rem;
  padding: 2rem 0;
  max-width: 400px;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton {
  background: linear-gradient(
    90deg,
    var(--surface) 25%,
    var(--surface2) 50%,
    var(--surface) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: .25rem;
}

.skeleton-heading {
  width: 40%;
  height: .8rem;
}

.skeleton-line {
  width: 100%;
  height: .6rem;
}

.skeleton-line-short {
  width: 75%;
  height: .6rem;
}

.btn {
  font-family: var(--mono);
  font-size: var(--text-xs);
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: .45rem .9rem;
  border-radius: .3rem;
  transition: all var(--dur-fast);
  cursor: pointer;
}

.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn:disabled {
  opacity: .4;
  cursor: default;
}

.btn.primary {
  font-size: var(--text-sm);
  padding: .55rem 1.2rem;
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
  font-weight: 600;
}

.btn.primary:hover {
  box-shadow: var(--box-shadow-md);
  opacity: .9;
}

.btn.warn {
  border-color: var(--warn);
  color: var(--warn);
  background: var(--warn-bg);
}

.btn.warn:hover {
  background: var(--warn);
  color: var(--bg);
}

.btn.active {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: .75rem 0;
}

.btn-row-center {
  justify-content: center;
  margin-bottom: .75rem;
}

.detail-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: .5rem;
  padding: 1.25rem;
  box-shadow: var(--box-shadow-sm);
}

.detail-panel h3 {
  font-family: var(--mono);
  font-size: var(--text-base);
  color: var(--pri-fg, var(--accent));
  font-weight: 700;
  margin-bottom: .5rem;
}

.detail-row {
  display: flex;
  gap: .5rem;
  flex-wrap: wrap;
  margin-bottom: .5rem;
  font-size: var(--text-sm);
}

.detail-label {
  font-family: var(--mono);
  font-size: var(--text-xs);
  color: var(--text-dim);
  font-weight: 600;
  min-width: 140px;
}

.detail-layer {
  margin-top: .75rem;
  padding-top: .75rem;
  border-top: 1px solid var(--border);
}

.resize-handle {
  display: none;
  align-items: center;
  align-self: center;
  justify-content: center;
  flex: 0 0 8px;
  cursor: col-resize;
  user-select: none;
  border-color: var(--border);
  border-style: solid;
  border-width: 0.08rem;
  border-radius: calc(0.1vw + 0.1rem);
}

.resize-grip {
  width: calc(.17vw + .175rem);
  height: calc(1vw + 1.2rem);
  background: var(--border);
  background-image: repeating-linear-gradient(
      to bottom,
      var(--text-dim) 0,
      var(--text-dim) 1px,
      transparent 1px,
      transparent 4px);
  border-radius: 1px;
  transition: background var(--dur-fast);
}

.resize-handle:hover {
  background: var(--surface2);
}

.resize-handle:hover .resize-grip {
  background: var(--text-dim);
  background-image: repeating-linear-gradient(
      to bottom,
      var(--text) 0,
      var(--text) 1px,
      transparent 1px,
      transparent 4px);
}

.resize-handle.dragging {
  background: var(--surface2);
}

.resize-handle.dragging .resize-grip {
  background: var(--accent);
  background-image: repeating-linear-gradient(
      to bottom,
      rgba(255, 255, 255, .6) 0,
      rgba(255, 255, 255, .6) 1px,
      transparent 1px,
      transparent 4px);
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: .35rem;
}

.control-label {
  font-family: var(--mono);
  font-size: var(--text-xs);
  color: var(--text-dim);
  text-transform: uppercase;
}

.control-btns {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
}

.search-wrap {
  margin-bottom: 1rem;
}

.search-input {
  width: 100%;
  max-width: 400px;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: .5rem .75rem;
  border-radius: .3rem;
  font-size: var(--text-sm);
}

.search-input:focus {
  outline: none;
  border-color: var(--accent);
}

.quiz-count {
  width: 4rem;
}

.answer-opts {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  margin: 1rem 0;
}

.answer-btn {
  font-family: var(--mono);
  font-size: var(--text-sm);
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: .6rem 1rem;
  border-radius: .4rem;
  text-align: left;
  cursor: pointer;
  box-shadow: var(--box-shadow-sm);
  transition: all var(--dur-fast);
}

.answer-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.answer-btn.correct {
  background: var(--correct-bg);
  border-color: var(--correct-border);
  color: var(--correct);
}

.answer-btn.correct::before {
  content: '\2713\a0';
}

.answer-btn.incorrect {
  background: var(--error-bg);
  border-color: var(--error-border);
  color: var(--error);
}

.answer-btn.incorrect::before {
  content: '\2717\a0';
}

.answered .answer-btn {
  pointer-events: none;
}

.answer-btn.selected-correct {
  background: var(--correct-bg);
  border-color: var(--correct-border);
  color: var(--correct);
}

.feedback-box {
  border-radius: .4rem;
  padding: 1rem;
  margin-top: 1rem;
  font-size: var(--text-sm);
  border-left: 4px solid var(--accent);
  background: var(--accent-bg);
}

.feedback-box.error {
  border-left-color: var(--error-border);
  background: var(--error-bg);
}

.score-display {
  font-family: var(--mono);
  font-size: var(--text-sm);
  color: var(--accent);
  text-align: right;
  margin-bottom: .75rem;
}

.placeholder-text {
  color: var(--text-dim);
}

.instruction-text {
  font-size: var(--text-sm);
  margin-bottom: .75rem;
}

.instruction-text-lg {
  font-size: var(--text-sm);
  margin-bottom: 1rem;
}

.mono-label {
  font-family: var(--mono);
  font-size: var(--text-xs);
  color: var(--text-dim);
  margin-bottom: .35rem;
}

.mono-inverse {
  font-size: var(--text-sm);
}

.mt-1 {
  margin-top: 1rem;
}

.mt-1-5 {
  margin-top: 1.5rem;
}

.mt-2 {
  margin-top: 2rem;
}