/* Paleta y escala comunes a la interfaz. El contenido vive en content.js. */
:root {
  --paper:#f4f3ed;
  --card:#fffefa;
  --ink:#253638;
  --muted:#6d7877;
  --line:#e0e3da;
  --teal:#276d65;
  --teal-pale:#e7efea;
  --amber:#ad733e;
  --coral:#c67466;
  --radius:16px;
  font-family:"Avenir Next",Avenir,"Segoe UI",sans-serif;
  color:var(--ink);
  background:var(--paper);
  font-synthesis:none
}
* {
  box-sizing:border-box
}
body {
  margin:0
}
button,input {
  font:inherit
}
button,a,input {
  -webkit-tap-highlight-color:transparent
}
button {
  cursor:pointer
}
button {
  color:inherit
}
a {
  color:var(--teal)
}
button:focus-visible,a:focus-visible,input:focus-visible,[tabindex]:focus-visible {
  outline:3px solid #408fba;
  outline-offset:4px
}
button:disabled {
  cursor:default
}
[hidden] {
  display:none!important
}
.skip-link {
  position:fixed;
  top:-100px;
  left:20px;
  background:white;
  padding:14px;
  z-index:20
}
.skip-link:focus {
  top:12px
}
/* Retorno al portal cuando el atlas se sirve dentro de apps/medula-atlas/. */
.portal-bar {
  min-height:38px;
  padding:9px clamp(18px,3vw,38px);
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:16px;
  border-bottom:1px solid var(--line);
  font-size:12px;
  color:var(--muted)
}
.portal-bar a {
  text-decoration:none;
  font-weight:600
}
.portal-bar a:hover {
  text-decoration:underline
}
@media(max-width:600px) {
  .portal-bar span { display:none }
}
.topbar {
  height:86px;
  border-bottom:1px solid var(--line);
  padding:0 38px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:22px;
  background:var(--card)
}
.brand {
  display:flex;
  align-items:center;
  gap:11px;
  color:var(--ink);
  text-decoration:none;
  font-weight:750;
  letter-spacing:3px;
  font-size:19px
}
.brand svg {
  width:38px;
  height:38px;
  fill:none;
  stroke:var(--teal);
  stroke-width:1.8
}
.brand-sub {
  display:block;
  letter-spacing:.7px;
  font-size:10px;
  font-weight:500;
  color:var(--muted);
  margin-top:2px
}
.main-nav {
  display:flex;
  gap:30px;
  height:100%;
  align-items:stretch
}
.nav-btn {
  background:none;
  border:0;
  border-bottom:3px solid transparent;
  font-size:13px;
  color:var(--muted);
  padding:0 4px
}
.nav-btn.active {
  border-bottom-color:var(--teal);
  color:var(--teal);
  font-weight:650
}
.mode-button {
  border:1px solid var(--line);
  background:none;
  border-radius:8px;
  font-size:12px;
  padding:10px 13px;
  display:flex;
  align-items:center;
  gap:8px;
  white-space:nowrap
}
.mode-dot,.status-dot {
  width:6px;
  height:6px;
  background:var(--teal);
  border-radius:50%;
  display:inline-block
}
.mode-button[aria-pressed=true] {
  background:var(--teal);
  border-color:var(--teal);
  color:white
}
.mode-button[aria-pressed=true] .mode-dot {
  background:#d7e7bc
}
main {
  max-width:1640px;
  margin:0 auto;
  padding:30px 38px 20px
}
.page-heading {
  display:flex;
  align-items:center;
  justify-content:space-between;
  margin-bottom:27px;
  gap:18px
}
.eyebrow {
  font-size:10px;
  color:var(--muted);
  letter-spacing:1.8px;
  margin:0 0 8px;
  font-weight:600
}
h1 {
  font-family:Georgia,"Times New Roman",serif;
  font-size:35px;
  letter-spacing:-1.2px;
  font-weight:400;
  line-height:1.15;
  margin:0 0 10px
}
.intro {
  font-size:13px;
  color:var(--muted);
  margin:0;
  line-height:1.6
}
.level-tag {
  font-size:11px;
  color:var(--teal);
  padding:9px 12px;
  border-radius:20px;
  border:1px solid #d7dfd3;
  white-space:nowrap;
  display:flex;
  align-items:center;
  gap:8px
}
.workspace {
  display:grid;
  grid-template-columns:minmax(255px,.9fr) minmax(420px,1.65fr) minmax(280px,1fr);
  gap:18px;
  align-items:start
}
.panel {
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--card);
  overflow:hidden
}
.panel-heading {
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:12px;
  padding:20px 20px 17px
}
.step {
  font-size:9px;
  font-weight:650;
  letter-spacing:1.4px;
  color:var(--muted)
}
h2 {
  font-size:16px;
  font-weight:650;
  letter-spacing:-.35px;
  margin:7px 0 0
}
.small-tag {
  border:1px solid var(--line);
  border-radius:5px;
  font-size:9px;
  padding:5px;
  color:var(--muted)
}
.spine-viewport {
  position:relative;
  height:350px;
  background:radial-gradient(ellipse at center,#2c444a 0%,#172a30 75%);
  overflow:hidden;
  margin:0 12px;
  border-radius:10px;
  color:#dce6e1;
  touch-action:none
}
.spine-viewport canvas {
  display:block;
  width:100%;
  height:100%;
  touch-action:none
}
.canvas-loading {
  position:absolute;
  left:20px;
  top:100px;
  font-size:13px;
  max-width:85%
}
.orientation {
  position:absolute;
  left:14px;
  right:14px;
  top:14px;
  display:flex;
  justify-content:space-between;
  font-size:9px;
  color:#bed0ce;
  pointer-events:none;
  z-index:1
}
.plane-label {
  position:absolute;
  bottom:16px;
  left:14px;
  font-size:9px;
  letter-spacing:.3px;
  color:#a6d9cb;
  pointer-events:none
}
.view-buttons {
  display:flex;
  justify-content:center;
  gap:3px;
  margin:13px 12px 0;
  border:1px solid var(--line);
  border-radius:7px;
  padding:3px
}
.view-buttons button {
  flex:1;
  background:none;
  border:0;
  font-size:11px;
  padding:8px 4px;
  border-radius:4px;
  color:var(--muted)
}
.view-buttons button.active {
  background:var(--teal-pale);
  color:var(--teal)
}
.gesture-hint {
  text-align:center;
  font-size:9px;
  color:var(--muted);
  margin:9px 10px 18px;
  line-height:1.6
}
.bone-controls {
  padding:0 20px 17px;
  border-bottom:1px solid var(--line)
}
.range-label {
  display:flex;
  justify-content:space-between;
  align-items:center;
  font-size:11px;
  gap:10px
}
.range-label output {
  font-variant-numeric:tabular-nums;
  font-size:10px;
  color:var(--muted)
}
input[type=range] {
  width:100%;
  accent-color:var(--teal);
  margin:12px 0
}
input[type=checkbox] {
  accent-color:var(--teal);
  width:13px;
  height:13px
}
.checkbox-row {
  display:flex;
  gap:12px;
  flex-wrap:wrap;
  font-size:10px
}
.checkbox-row label {
  display:flex;
  gap:5px;
  align-items:center
}
.structure-buttons {
  padding:12px 18px 3px;
  display:grid;
  gap:3px
}
.structure-buttons button {
  border:0;
  background:none;
  text-align:left;
  display:flex;
  align-items:center;
  gap:9px;
  font-size:11px;
  padding:9px 7px;
  border-radius:6px
}
.structure-buttons button>span:last-child {
  margin-left:auto;
  color:var(--muted)
}
.structure-buttons button.active,.structure-buttons button:hover {
  background:#f0f1e9
}
.structure-swatch {
  width:9px;
  height:9px;
  border-radius:50%;
  flex-shrink:0
}
.bone-swatch {
  background:#c6b798
}
.canal-swatch {
  background:#7baaa5
}
.cord-swatch {
  background:var(--coral)
}
.structure-description {
  margin:10px 19px 20px;
  border-left:2px solid #c4cabc;
  padding-left:11px;
  font-size:11px;
  line-height:1.65
}
.structure-description strong {
  font-size:11px;
  font-weight:650
}
.structure-description p {
  color:var(--muted);
  margin:6px 0 0
}
.section-panel .panel-heading {
  padding-bottom:14px
}
.icon-label-button {
  border:1px solid var(--line);
  background:none;
  border-radius:6px;
  padding:7px 9px;
  font-size:10px;
  white-space:nowrap
}
.icon-label-button span {
  padding-left:4px;
  color:var(--teal)
}
.filter-bar {
  display:flex;
  gap:4px;
  border-bottom:1px solid var(--line);
  padding:0 18px 13px
}
.filter-bar button {
  display:flex;
  align-items:center;
  gap:5px;
  border:0;
  border-radius:6px;
  padding:8px 11px;
  font-size:11px;
  background:none;
  color:var(--muted)
}
.filter-bar button.active {
  background:var(--teal-pale);
  color:var(--teal);
  font-weight:600
}
.dot {
  width:6px;
  height:6px;
  border-radius:50%
}
.ascending-dot {
  background:var(--teal)
}
.descending-dot {
  background:var(--amber)
}
.section-map {
  padding:5px 8px 0;
  background:radial-gradient(ellipse,#f5f6ef 0%,var(--card) 70%)
}
#cord-svg {
  width:100%;
  height:auto;
  max-height:432px;
  display:block
}
.map-orientation {
  fill:#83918a;
  font-size:10px;
  letter-spacing:2px;
  text-anchor:middle
}
.map-side {
  fill:#8d968f;
  font-size:9px;
  text-anchor:middle
}
.anatomy-label {
  fill:#7c8580;
  font-size:10px;
  text-anchor:middle
}
.tract-shape {
  cursor:pointer;
  stroke:var(--card);
  stroke-width:2;
  transition:opacity .15s,stroke .15s
}
.tract-shape:hover {
  stroke:var(--ink);
  stroke-width:2.5
}
.tract-shape:focus {
  outline:none;
  stroke:#172f33;
  stroke-width:4
}
.tract-shape.selected {
  stroke:#254a4a;
  stroke-width:3
}
.tract-shape.muted {
  opacity:.12;
  pointer-events:none
}
.tract-shape.dim {
  opacity:.55
}
.tract-symbol {
  font-size:10px;
  fill:#fffefa;
  text-anchor:middle;
  font-weight:650;
  pointer-events:none
}
.map-labels.off {
  display:none
}
.map-caption {
  display:flex;
  gap:7px;
  align-items:center;
  padding:10px 20px 0;
  font-size:10px
}
.selection-indicator {
  width:6px;
  height:6px;
  background:var(--teal);
  border-radius:50%;
  flex-shrink:0
}
.map-direction {
  margin-left:auto;
  color:var(--muted);
  font-size:9px
}
.anatomy-note {
  margin:10px 20px 15px;
  color:var(--muted);
  font-size:10px;
  line-height:1.6
}
.tract-index-heading {
  display:flex;
  align-items:center;
  justify-content:space-between;
  margin:0 20px 10px;
  border-top:1px solid var(--line);
  padding-top:14px
}
.tract-index-heading h3 {
  font-size:11px;
  font-weight:600;
  margin:0
}
.tract-index-heading span {
  font-size:9px;
  color:var(--muted)
}
.tract-list {
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:5px;
  padding:0 15px 20px
}
.tract-list button {
  border:1px solid transparent;
  text-align:left;
  background:none;
  border-radius:6px;
  padding:8px 7px;
  font-size:10px;
  display:flex;
  align-items:center;
  gap:7px;
  line-height:1.4
}
.tract-list button:hover {
  background:#f1f3ea
}
.tract-list button.active {
  border-color:#b8cdc3;
  background:var(--teal-pale)
}
.tract-list .tract-dot {
  width:7px;
  height:7px;
  border-radius:50%;
  flex-shrink:0
}
.detail-panel {
  border-top:3px solid var(--teal)
}
.detail-panel .panel-heading {
  padding:18px 20px 12px
}
.direction-badge {
  font-size:9px;
  color:var(--teal);
  background:var(--teal-pale);
  padding:6px 8px;
  border-radius:5px;
  white-space:nowrap
}
.direction-badge.motor {
  background:#f5ebdd;
  color:#976a3f
}
#tract-detail {
  padding:0 20px 21px
}
.tract-title {
  font-family:Georgia,"Times New Roman",serif;
  font-weight:400;
  font-size:26px;
  line-height:1.12;
  margin:8px 0 9px;
  letter-spacing:-.6px
}
.tract-latin {
  font-size:10px;
  color:var(--muted);
  font-style:italic;
  margin:0 0 18px
}
.tract-summary {
  font-size:12px;
  line-height:1.65;
  color:#475956;
  margin:0 0 18px
}
.detail-block {
  border-top:1px solid var(--line);
  padding:13px 0 0;
  margin-top:13px
}
.detail-block h3 {
  font-size:9px;
  text-transform:uppercase;
  letter-spacing:1.4px;
  color:var(--muted);
  margin:0 0 7px;
  font-weight:600
}
.detail-block p {
  font-size:11px;
  line-height:1.7;
  margin:0;
  color:#495a57
}
.route {
  list-style:none;
  padding:0;
  margin:8px 0 10px;
  counter-reset:route
}
.route li {
  font-size:11px;
  line-height:1.5;
  position:relative;
  padding:0 0 13px 23px
}
.route li:last-child {
  padding-bottom:0
}
.route li:before {
  content:"";
  position:absolute;
  left:3px;
  top:4px;
  width:6px;
  height:6px;
  background:var(--teal);
  border-radius:50%;
  z-index:1
}
.route li:after {
  content:"";
  position:absolute;
  left:5px;
  top:9px;
  bottom:-4px;
  width:1px;
  background:#cbd8cb
}
.route li:last-child:after {
  display:none
}
.crossing {
  background:#f0f2e9;
  border-radius:7px;
  padding:10px 11px;
  margin:9px 0 0
}
.crossing strong {
  font-size:10px;
  font-weight:600;
  display:block;
  margin-bottom:4px
}
.crossing p {
  font-size:10px;
  line-height:1.6;
  margin:0;
  color:#56625b
}
.clinical-block {
  background:#f7f0e6;
  border-top:0;
  border-radius:8px;
  padding:12px;
  margin-top:14px
}
.clinical-block h3 {
  color:#9b734f
}
.detail-source-links {
  display:flex;
  flex-direction:column;
  gap:6px
}
.detail-source-links a {
  font-size:10px;
  line-height:1.5;
  text-underline-offset:3px
}
.teacher-guide {
  padding:16px 20px;
  margin-bottom:20px;
  border:1px solid #ccd8c4;
  border-radius:12px;
  background:#ecf0e5;
  display:flex;
  align-items:center;
  gap:20px;
  justify-content:space-between
}
.teacher-guide strong {
  font-size:12px
}
.teacher-guide p {
  font-size:11px;
  line-height:1.7;
  margin:6px 0 0;
  color:#576550
}
.secondary-button {
  border:1px solid #bdcdbb;
  border-radius:7px;
  font-size:11px;
  padding:9px 12px;
  background:#f7f9f1;
  white-space:nowrap
}
.primary-button {
  background:var(--teal);
  color:white;
  border:0;
  border-radius:8px;
  padding:12px 18px;
  font-size:12px;
  margin-top:16px
}
.practice-page {
  max-width:750px;
  margin:35px auto 50px
}
.practice-intro h2 {
  font-family:Georgia,serif;
  font-size:30px;
  font-weight:400;
  margin:10px 0
}
.practice-intro p {
  font-size:13px;
  color:var(--muted);
  line-height:1.7
}
.quiz-card {
  padding:26px;
  margin-top:22px
}
.quiz-progress {
  display:flex;
  justify-content:space-between;
  font-size:11px;
  color:var(--muted)
}
.progress-track {
  height:4px;
  border-radius:4px;
  background:#e9eee5;
  margin:14px 0 25px
}
.progress-track div {
  height:100%;
  background:var(--teal);
  border-radius:4px;
  transition:width .2s
}
#quiz-question {
  font-size:19px;
  line-height:1.5;
  font-weight:550
}
.quiz-option {
  display:block;
  width:100%;
  background:#fafbf4;
  border:1px solid var(--line);
  border-radius:8px;
  text-align:left;
  padding:14px;
  margin:9px 0;
  font-size:13px;
  line-height:1.5
}
.quiz-option:hover:not(:disabled) {
  border-color:var(--teal)
}
.quiz-option.correct {
  background:#e3f0e6;
  border-color:#659a77
}
.quiz-option.incorrect {
  background:#faeae5;
  border-color:#c78171
}
#quiz-feedback {
  font-size:13px;
  line-height:1.7;
  margin-top:20px;
  color:#3b6253
}
#quiz-feedback.wrong {
  color:#95624d
}
.quiz-result {
  font-family:Georgia,serif;
  font-size:26px;
  font-weight:400
}
.sources-page {
  max-width:860px;
  margin:25px auto;
  padding:30px
}
.sources-page h2 {
  font-family:Georgia,serif;
  font-size:30px;
  font-weight:400;
  margin:15px 0 22px
}
.sources-page p {
  font-size:13px;
  line-height:1.8;
  color:#52615b
}
.sources-page h3 {
  font-size:15px;
  margin:28px 0 14px
}
.source-entry {
  border-top:1px solid var(--line);
  padding:16px 0;
  display:grid;
  grid-template-columns:27px 1fr;
  gap:10px
}
.source-entry>span {
  color:#9ca899;
  font-size:11px
}
.source-entry a {
  font-size:13px;
  text-underline-offset:4px;
  line-height:1.6
}
.source-entry p {
  font-size:11px;
  margin:5px 0
}
.source-date {
  font-size:11px!important
}
footer {
  display:flex;
  justify-content:space-between;
  gap:15px;
  border-top:1px solid var(--line);
  padding:20px 0 0;
  margin-top:25px;
  color:#7c8980;
  font-size:10px;
  letter-spacing:.1px
}
/* En pantallas pequeñas el corte conserva todo su espacio y los controles se apilan. */
.mobile-map-button {
  display:none
}
@media(min-width:1500px) {
  .spine-viewport {
    height:385px
  }
  #cord-svg {
    max-height:470px
  }
  .tract-list button {
    font-size:11px
  }
  .detail-block p {
    font-size:12px
  }
  .tract-summary {
    font-size:13px
  }
}
@media(max-width:1150px) {
  main {
    padding:25px 24px
  }
  .topbar {
    padding:0 24px
  }
  .workspace {
    grid-template-columns:minmax(255px,.9fr) minmax(400px,1.6fr)
  }
  .detail-panel {
    grid-column:1/-1
  }
  #tract-detail {
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:0 30px
  }
  .tract-title,.tract-latin,.tract-summary {
    grid-column:1/-1
  }
  .detail-panel .panel-heading {
    justify-content:flex-start
  }
  .detail-source-block {
    grid-column:1/-1
  }
  .page-heading {
    align-items:flex-start
  }
  .level-tag {
    margin-top:10px
  }
}
@media(max-width:760px) {
  .topbar {
    height:auto;
    min-height:100px;
    flex-wrap:wrap;
    padding:15px 18px 0;
    gap:12px
  }
  .brand {
    font-size:17px
  }
  .brand svg {
    width:31px;
    height:31px
  }
  .brand-sub {
    font-size:9px
  }
  .mode-button {
    font-size:10px;
    padding:8px 10px
  }
  .main-nav {
    order:3;
    width:100%;
    gap:24px;
    height:39px;
    justify-content:center
  }
  .nav-btn {
    font-size:12px
  }
  .page-heading {
    display:block;
    margin-bottom:19px
  }
  h1 {
    font-size:30px
  }
  .intro {
    font-size:12px
  }
  .level-tag {
    display:inline-flex;
    margin-top:13px;
    font-size:10px
  }
  main {
    padding:24px 14px 16px
  }
  .workspace {
    display:flex;
    flex-direction:column;
    gap:16px
  }
  .panel {
    width:100%
  }
  .section-panel {
    order:0
  }
  .detail-panel {
    order:1
  }
  .bone-panel {
    order:2
  }
  .panel-heading {
    padding:17px 17px 15px
  }
  #cord-svg {
    max-height:none
  }
  .filter-bar {
    padding:0 14px 12px
  }
  .filter-bar button {
    font-size:10px;
    padding:8px 10px
  }
  .tract-list button {
    font-size:10px;
    padding:10px 6px
  }
  .map-direction {
    font-size:8px
  }
  #tract-detail {
    display:block
  }
  .tract-title {
    font-size:29px
  }
  .tract-summary {
    font-size:13px
  }
  .detail-block p {
    font-size:12px
  }
  .detail-block h3 {
    font-size:10px
  }
  .route li {
    font-size:12px
  }
  .spine-viewport {
    height:360px
  }
  .bone-controls {
    padding:0 20px 20px
  }
  .range-label {
    font-size:12px
  }
  .checkbox-row {
    font-size:12px;
    gap:18px
  }
  .structure-buttons button {
    font-size:12px;
    padding:12px 7px
  }
  .structure-description {
    font-size:12px
  }
  .teacher-guide {
    align-items:flex-start;
    flex-direction:column;
    gap:10px
  }
  .sources-page {
    padding:23px
  }
  .practice-page {
    margin:10px auto 25px
  }
  .quiz-card {
    padding:20px
  }
  footer {
    font-size:9px;
    line-height:1.6;
    display:block
  }
  footer span {
    display:block;
    margin-bottom:6px
  }
}
@media(prefers-reduced-motion:reduce) {
  * {
    scroll-behavior:auto!important;
    transition:none!important
  }
}
@media(max-width:760px) {
  .mobile-map-button {
    display:block;
    margin:0 20px 12px;
    border:1px solid var(--line);
    border-radius:6px;
    background:var(--teal-pale);
    color:var(--teal);
    font-size:11px;
    padding:8px 11px
  }
}
@media print {
  body {
    background:white
  }
  .topbar,.bone-panel,.filter-bar,.tract-list,.tract-index-heading,.teacher-guide,.icon-label-button,.main-nav,.mobile-map-button,footer {
    display:none!important
  }
  main {
    padding:0
  }
  .page-heading {
    margin:10px 0
  }
  .workspace {
    display:block
  }
  .panel {
    border:0;
    page-break-inside:avoid
  }
  .section-map {
    max-width:430px;
    margin:auto
  }
  .detail-panel {
    margin-top:20px
  }
  #tract-detail {
    display:block
  }
  .detail-block {
    page-break-inside:avoid
  }
  .map-caption,.anatomy-note {
    max-width:500px;
    margin:10px auto
  }
  .sources-page {
    display:block!important;
    page-break-before:always
  }
  .source-entry {
    padding:8px 0
  }
  .source-entry a:after {
    content:" (" attr(href) ")";
    font-size:9px
  }
  .practice-page {
    display:none!important
  }
}
/* Ayuda de apertura: evita mostrar paneles vacíos cuando se usa file://. */
.startup-notice { max-width: 760px; margin: 8vh auto; padding: 32px; border: 1px solid #dce2d7; border-radius: 20px; background: #fffefa; }
.startup-notice h1 { font-size: clamp(2rem, 5vw, 3rem); }
.startup-notice p, .startup-notice li { line-height: 1.7; }
.startup-notice ol { padding-left: 24px; margin: 24px 0; }
.startup-notice .primary-button { display: inline-block; text-decoration: none; }
.startup-help { color: #64746d; font-size: .9rem; }
@media (max-width: 760px) { .startup-notice { margin: 24px 16px; padding: 24px; } }