/* Nephro Rush's cinematic visual layer. Load after the component styles. */
:root {
  --bg: #090e18;
  --ink: #f4efe8;
  --muted: #a8b3c2;
  --panel: #121c29;
  --panel-light: #1a2737;
  --border: #2b394b;
  --aqua: #83e0d0;
  --lime: #83e0d0;
  --coral: #f28d88;
  --red: #f28d88;
  --radius: 20px;
  --premium-soft: #d2d8df;
  --premium-shadow: 0 22px 70px #02050b45;
  --nr-header-clearance: 104px;
}

html { background: var(--bg); scroll-padding-top: var(--nr-header-clearance); scroll-padding-bottom: 30px; }
body, body.learning-screen {
  color: var(--ink);
  background: var(--bg);
  background-image: radial-gradient(ellipse at 90% 0%, #32405e22, transparent 43%), radial-gradient(ellipse at 6% 24%, #40526712, transparent 36%);
  color-scheme: dark;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}
*, *::before, *::after { box-sizing: border-box; }
button, input, select { font: inherit; }
button { -webkit-tap-highlight-color: transparent; }
button:focus-visible, summary:focus-visible, a:focus-visible,
.learning-screen button:focus-visible, input:focus-visible, select:focus-visible {
  outline: 2px solid var(--aqua);
  outline-offset: 4px;
}
button:disabled { cursor: default; }
a { color: var(--aqua); text-underline-offset: 3px; }
h1, h2, h3 { color: var(--ink); text-wrap: balance; }
h1 { font-weight: 620; letter-spacing: -.055em; line-height: 1.08; }
h2 { font-weight: 620; letter-spacing: -.035em; }
p { line-height: 1.65; }
strong { font-weight: 650; }
.app-shell { --nr-page-gutter: 48px; max-width: 1360px; padding: 0 var(--nr-page-gutter); }
.site-header, .learning-screen .site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  margin-inline: calc(-1 * var(--nr-page-gutter));
  padding: 23px var(--nr-page-gutter);
  gap: 24px;
  border-bottom: 1px solid #f4efe816;
  background: var(--bg);
  box-shadow: 0 8px 20px #02050b24;
}
.site-header .brand, .learning-screen .site-header .brand {
  min-height: 44px;
  flex-shrink: 0;
  gap: 11px;
  color: var(--ink);
  font-family: "Avenir Next", Avenir, "Segoe UI", sans-serif;
  font-size: 1.6rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.055em;
  text-transform: none;
}
.brand-wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: .22em;
  padding-bottom: 3px;
  white-space: nowrap;
}
.brand-wordmark-nephro { font-weight: 800; }
.brand-wordmark-rush {
  position: relative;
  font-family: "Avenir Next", Avenir, "Segoe UI", sans-serif;
  color: var(--coral);
  font-style: italic;
  font-weight: 750;
  letter-spacing: -.065em;
}
.brand-wordmark-rush::after {
  content: "";
  position: absolute;
  left: .04em;
  right: .02em;
  bottom: -.15em;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, currentColor 60%, transparent);
  opacity: .72;
  transform: skewX(-22deg);
  pointer-events: none;
}
.site-nav, .site-header nav { gap: 5px; }
.site-header .nav-button, .learning-screen .site-header .nav-button {
  min-height: 44px;
  padding: 10px 16px;
  border: 1px solid transparent;
  border-radius: 10px;
  color: var(--muted);
  background: transparent;
  font-size: 14px;
  font-weight: 550;
  box-shadow: none;
}
.site-header .nav-button:hover, .learning-screen .site-header .nav-button:hover { color: var(--ink); background: #ffffff06; }
.site-header .nav-button.active, .learning-screen .site-header .nav-button.active {
  color: var(--ink);
  background: #f4efe80a;
  border-color: #f4efe81b;
  box-shadow: none;
}
.icon-button, .learning-screen .icon-button {
  width: 44px;
  height: 44px;
  min-height: 44px;
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--premium-soft);
  background: transparent;
}
main { padding: 36px 0 52px; min-height: 700px; }
.eyebrow, .path-eyebrow {
  color: var(--muted);
  font-size: .7rem;
  line-height: 1.45;
  font-weight: 650;
  letter-spacing: .15em;
  text-transform: uppercase;
}
.primary-button, .path-primary, .secondary-button, .text-button, .path-text {
  min-height: 48px;
  padding: 13px 20px;
  border-radius: 11px;
  line-height: 1.35;
  font-size: .88rem;
  font-weight: 650;
  letter-spacing: -.01em;
  transition: background .18s ease, border-color .18s ease, transform .18s ease;
}
.primary-button, .path-primary {
  color: #0b2425;
  background: var(--aqua);
  border: 1px solid var(--aqua);
  box-shadow: 0 5px 24px #83e0d015;
}
.primary-button:hover:not(:disabled), .path-primary:hover:not(:disabled) { background: #a0eadf; border-color: #a0eadf; transform: translateY(-1px); }
.primary-button:active:not(:disabled), .path-primary:active:not(:disabled) { transform: translateY(0); border-bottom-width: 1px; }
.secondary-button {
  color: var(--ink);
  background: #f4efe806;
  border: 1px solid #6f7f936b;
  box-shadow: none;
}
.secondary-button:hover:not(:disabled) { border-color: #b5c3d0; background: #f4efe80d; }
.text-button, .path-text {
  color: var(--aqua);
  background: transparent;
  border: 1px solid transparent;
  box-shadow: none;
}
.text-button:hover:not(:disabled), .path-text:hover:not(:disabled) { background: #83e0d00b; }
.primary-button .arrow, .secondary-button>span, .path-primary>span { margin-left: 9px; }
.site-footer, .learning-screen .site-footer { color: var(--muted); border-color: #f4efe816; font-size: .75rem; padding: 23px 0 30px; }
.site-footer .text-button { font-size: .75rem; padding: 7px 10px; min-height: 44px; }
.site-footer button, .learning-screen .site-footer button { color: var(--premium-soft); min-height: 44px; padding: 7px 10px; font-size: .75rem; }
.storage-notice { color: var(--coral); font-size: .8rem; line-height: 1.55; }

/* The first action leads; Ren supports it. */
.learning-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  gap: 42px;
  align-items: center;
  padding: 10px 0 46px;
  position: relative;
}
.learning-hero-copy { display: block; position: relative; min-width: 0; z-index: 1; }
.learning-hero h1 {
  max-width: 660px;
  margin: 19px 0 24px;
  font-size: clamp(3rem, 5.7vw, 5.25rem);
  line-height: 1.035;
  letter-spacing: -.062em;
  font-weight: 590;
  color: var(--ink);
}
.learning-hero h1 em { color: var(--coral); font-style: normal; font-weight: inherit; }
.learning-hero-copy>p { max-width: 480px; margin: 0 0 28px; color: var(--premium-soft); font-size: 1rem; line-height: 1.7; }
.learning-hero-copy>.hero-tagline { max-width: none; margin: 0 0 10px; color: var(--aqua); font-size: clamp(1.1rem, 1.8vw, 1.4rem); font-weight: 750; letter-spacing: -.025em; line-height: 1.4; }
.learning-hero-copy>.hero-route { max-width: none; margin: 0 0 10px; color: var(--ink); font-size: clamp(.94rem, 1.25vw, 1.06rem); font-weight: 650; letter-spacing: -.02em; line-height: 1.5; }
.learning-hero-copy>.hero-instructions { margin-bottom: 24px; }
@media (min-width: 1024px) {
  .learning-hero-copy>.hero-tagline, .learning-hero-copy>.hero-route { white-space: nowrap; }
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 11px; align-items: center; }
.hero-actions .path-primary { min-width: 200px; max-width: none; justify-content: space-between; }
.learning-screen .path-eyebrow { font-size: .8125rem; }
.hero-lesson-context { display: flex; flex-wrap: wrap; gap: 5px 14px; margin: 17px 0 0; color: var(--muted); font-size: .875rem; line-height: 1.5; }
.hero-lesson-context strong { color: var(--premium-soft); font-weight: 650; }
.hero-map-link { font-size: .875rem; }
.path-track-tabs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); max-width: 460px; gap: 8px; margin-top: 27px; }
.path-track-tabs button {
  min-width: 0;
  min-height: 63px;
  padding: 11px 13px;
  border: 1px solid var(--border);
  border-radius: 11px;
  background: #121c2966;
  color: var(--premium-soft);
  text-align: left;
  box-shadow: none;
}
.path-track-tabs button strong { display: block; color: var(--ink); font-size: 1.03rem; font-weight: 750; line-height: 1.4; letter-spacing: -.015em; }
.path-track-tabs button small { display: block; color: var(--muted); font-size: .8125rem; margin-top: 3px; }
.path-track-tabs button.selected { color: var(--aqua); background: #83e0d00c; border-color: #83e0d078; box-shadow: none; }
.path-track-tabs button.selected strong { color: var(--aqua); }
.path-track-tabs button:hover:not(.selected) { border-color: #697c90; background: #f4efe807; }
.kidney-welcome {
  position: relative;
  inset: auto;
  grid-column: auto;
  grid-row: auto;
  display: block;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-width: 0;
  min-height: 455px;
  align-self: stretch;
  pointer-events: auto;
}
.kidney-welcome::before, .kidney-welcome::after { content: none; display: none; }
.kidney-welcome .cinematic-scene { width: 100%; min-width: 0; min-height: 455px; border-radius: 26px; }
#kidney-cinematic { display: grid; place-items: center; width: 100%; min-width: 0; }
#kidney-cinematic .nk-cinematic { width: min(100%, 440px); max-width: none; margin: 0 auto; }
.kidney-scene-fallback { display: block; width: 100%; max-width: 440px; height: 430px; object-fit: contain; margin: auto; }
.kidney-visual-note { display: flex; justify-content: center; align-items: center; flex-wrap: wrap; gap: 10px 17px; color: var(--muted); font-size: .8125rem; line-height: 1.55; margin: 18px auto 0; text-align: center; }
.kidney-visual-note>span:first-child { font-size: 32px; line-height: 1.1; letter-spacing: -.045em; color: var(--coral); }
.kidney-welcome .mascot-speech { display: none; }
.ren-orb { position: relative; flex: none; width: var(--orb-size, 52px); height: var(--orb-size, 52px); display: inline-grid; place-items: center; overflow: visible; border-radius: 12px; contain: layout style; content-visibility: auto; contain-intrinsic-size: var(--orb-size, 52px) var(--orb-size, 52px); }
.ren-orb img { position: relative; z-index: 1; width: 94%; height: 88%; display: block; object-fit: contain; transform-origin: 50% 80%; }
.brand .ren-orb, #brand-mascot .ren-orb { --orb-size: 40px; border-radius: 10px; overflow: visible; }
.choice-top .ren-orb { --orb-size: 70px; }
.lesson-gamebar .ren-orb { --orb-size: 43px; }
.lesson-celebration .ren-orb { --orb-size: 96px; }
.choice-top .ren-orb, .lesson-gamebar .ren-orb, .lesson-celebration .ren-orb { width: var(--orb-size); height: var(--orb-size); }
.ren-orb.nr-mascot { animation: none; transform: none; }
.ren-orb-check { position: absolute; z-index: 2; right: 0; bottom: 0; display: grid; place-items: center; width: 24px; height: 24px; border-radius: 50%; border: 2px solid var(--panel); background: var(--aqua); color: #0b2425; font-size: .72rem; }
.ren-speedster-trails { position: absolute; inset: 0; z-index: 0; pointer-events: none; }
.ren-speedster-trail { position: absolute; left: 2%; top: 37%; width: 31%; height: 5%; display: block; opacity: 0; background: linear-gradient(90deg, #f9cf7d00, #f9cf7d 72%, #fff0c5); clip-path: polygon(0 28%, 45% 28%, 36% 64%, 100% 44%, 54% 100%, 63% 64%, 0 64%); }
.ren-speedster-trail:nth-child(2) { top: 54%; left: -1%; width: 27%; animation-delay: .12s; }
.ren-speedster-trail:nth-child(3) { top: 70%; left: 4%; width: 25%; animation-delay: .24s; }
.ren-orb--welcome .ren-speedster-art { animation: ren-speedster-welcome 3.6s ease-in-out 1; }
.ren-orb--welcome .ren-speedster-trail { animation-name: ren-speedster-dash; animation-duration: 3.6s; animation-timing-function: ease-in-out; animation-iteration-count: 1; animation-fill-mode: both; }
.ren-orb--thinking .ren-speedster-art { animation: ren-speedster-coach 2.4s ease-in-out 1; }
.ren-orb--happy .ren-speedster-art { animation: ren-speedster-cheer 1.3s ease-in-out 2; }
.ren-orb--happy .ren-speedster-trail { animation-name: ren-speedster-dash; animation-duration: 1.3s; animation-timing-function: ease-in-out; animation-iteration-count: 2; animation-fill-mode: both; }
.ren-orb--happy .ren-orb-check { animation: ren-speedster-check .4s ease-out 1; }
@keyframes ren-speedster-welcome {
  0%, 100% { transform: none; }
  25% { transform: translateY(-4%) rotate(1.1deg); }
  55% { transform: translateY(-1%) rotate(-.7deg); }
  75% { transform: translateY(-2%) rotate(.45deg); }
}
@keyframes ren-speedster-coach {
  0%, 100% { transform: none; }
  40% { transform: translateY(-2%) rotate(.8deg); }
  65% { transform: rotate(-.4deg); }
}
@keyframes ren-speedster-cheer {
  0%, 100% { transform: none; }
  25% { transform: translateY(-7%) rotate(-2deg); }
  50% { transform: translateY(-2%) rotate(1.5deg); }
  75% { transform: translateY(-3%) rotate(-.7deg); }
}
@keyframes ren-speedster-dash {
  0%, 100% { opacity: 0; transform: translateX(12%); }
  22% { opacity: .8; transform: translateX(-18%); }
  62% { opacity: 0; transform: translateX(-45%); }
}
@keyframes ren-speedster-check {
  from { transform: scale(.65); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}
@media (prefers-reduced-motion: reduce) {
  .ren-speedster .ren-speedster-art, .ren-speedster .ren-speedster-trail, .ren-speedster .ren-orb-check { animation: none !important; transform: none !important; }
  .ren-speedster .ren-speedster-trail { opacity: 0; }
}

/* The atlas keeps the whole course open, with an explicit next step. */
.learning-layout { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 30px; align-items: start; }
.journey-column { display: block; min-width: 0; }
.journey-heading, .path-intro { display: flex; align-items: flex-end; justify-content: space-between; gap: 18px; margin: 5px 0 17px; }
.journey-heading h2, .path-intro h2 { color: var(--ink); margin: 0 0 5px; font-size: 1.6rem; letter-spacing: -.035em; }
.journey-heading p, .journey-heading span, .path-intro>span { margin: 0; font-size: .79rem; color: var(--muted); line-height: 1.5; }
.journey-heading>div:last-child { flex: none; }
.path-legend { color: var(--muted); font-size: .82rem; line-height: 1.65; margin: 0 0 22px; }
.atlas-topic-buttons { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 9px; margin: 0 0 26px; }
.atlas-topic-buttons button {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr) 17px;
  align-items: center;
  justify-content: start;
  gap: 13px;
  min-width: 0;
  min-height: 78px;
  text-align: left;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: linear-gradient(130deg, #192434, #121c29);
  color: var(--ink);
  font-size: .81rem;
  line-height: 1.4;
  font-weight: 550;
}
.atlas-topic-buttons button:hover { border-color: #83e0d085; background: #1b2c3a; }
.atlas-topic-buttons button small, .atlas-topic-buttons button>span { font-size: .72rem; color: var(--muted); }
.atlas-topic-buttons button>svg { width: 30px; height: 30px; display: block; flex: none; color: var(--coral); }
.atlas-topic-buttons button:nth-child(3n+2)>svg { color: var(--aqua); }
.atlas-topic-buttons button>span:not(.topic-arrow) { min-width: 0; color: var(--ink); font-size: .84rem; line-height: 1.4; font-weight: 550; }
.atlas-topic-buttons .topic-arrow { color: var(--muted); font-size: .95rem; text-align: right; }
.atlas-topic-buttons button strong { font-size: inherit; }
.next-lesson-card {
  background: linear-gradient(120deg, #1c303b, #172330);
  border: 1px solid #83e0d047;
  border-radius: 16px;
  border-bottom-width: 1px;
  padding: 23px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 27px;
  box-shadow: none;
}
.next-lesson-card h2 { color: var(--ink); font-size: 1.3rem; margin: 7px 0 5px; }
.next-lesson-card p { color: var(--muted); font-size: .8rem; margin: 0; }
.course-path { display: grid; gap: 14px; }
.path-unit { border: 1px solid var(--border); border-radius: 16px; background: #121c298f; overflow: hidden; box-shadow: none; }
.path-unit summary {
  display: flex;
  align-items: center;
  gap: 15px;
  min-height: 92px;
  padding: 21px 23px;
  color: var(--ink);
  background: #121c29;
  border-bottom: 1px solid transparent;
}
.path-unit[open] summary { border-bottom-color: var(--border); }
.path-unit summary:focus-visible { outline: 2px solid var(--aqua); outline-offset: -5px; }
.path-unit summary:hover { background: #182333; }
.path-unit summary>span:nth-child(2) { min-width: 0; flex: 1; }
.path-unit summary small { display: block; color: var(--muted); font-size: .69rem; letter-spacing: .08em; margin-bottom: 6px; }
.path-unit summary strong { display: block; font-size: 1.03rem; font-weight: 600; line-height: 1.4; color: var(--ink); }
.unit-number { display: grid; place-items: center; width: 43px; height: 43px; flex: none; border: 1px solid #5060756e; border-radius: 10px; background: #f4efe805; color: var(--premium-soft); font-size: .85rem; box-shadow: none; }
.unit-chevron { color: var(--muted); font-size: 1.2rem; }
.path-unit.current-unit { border-color: #83e0d06b; }
.path-unit.current-unit summary { background: linear-gradient(110deg, #1a3038, #172532); border-bottom-color: #83e0d030; color: var(--ink); }
.path-unit.current-unit .unit-number { color: var(--aqua); background: #83e0d00c; border-color: #83e0d04d; box-shadow: none; }
.unit-description { color: var(--premium-soft); font-size: .83rem; margin: 20px 23px 8px; max-width: 650px; line-height: 1.65; }
.lesson-trail { position: static; display: grid; gap: 0; list-style: none; width: auto; max-width: none; margin: 0; padding: 8px 23px 14px; counter-reset: lesson-row; }
.lesson-trail::before { content: none; display: none; }
.trail-item, .trail-item.trail-0, .trail-item.trail-1, .trail-item.trail-2, .trail-item.trail-3 {
  position: relative;
  display: grid;
  grid-template-columns: 31px minmax(0, 1fr) auto;
  align-items: center;
  gap: 13px;
  min-height: 87px;
  padding: 15px 0;
  margin: 0;
  border-bottom: 1px solid #f4efe80d;
  counter-increment: lesson-row;
}
.trail-item:last-child { border-bottom: 0; }
.trail-item::before { content: none; display: none; }
.lesson-index {
  grid-column: 1;
  grid-row: 1;
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border: 1px solid #4d5f7369;
  border-radius: 50%;
  color: var(--muted);
  font-size: .68rem;
  font-variant-numeric: tabular-nums;
}
.trail-item.current .lesson-index { color: var(--aqua); border-color: #83e0d075; background: #83e0d00d; }
.trail-item.complete .lesson-index { color: var(--aqua); background: #83e0d00e; border-color: #83e0d03b; }
.trail-label { grid-column: 2; grid-row: 1; position: static; min-width: 0; max-width: none; padding: 0; background: transparent; color: var(--ink); }
.trail-label strong { color: var(--ink); display: block; font-size: .88rem; line-height: 1.45; font-weight: 550; }
.trail-item.current .trail-label strong, .trail-item.complete .trail-label strong { color: var(--ink); }
.trail-label span { display: block; color: var(--muted); font-size: .75rem; line-height: 1.45; margin-top: 4px; }
.lesson-node, .trail-item.current .lesson-node, .trail-item.complete .lesson-node {
  grid-column: 3;
  grid-row: 1;
  position: static;
  width: auto;
  height: auto;
  min-width: 99px;
  min-height: 44px;
  padding: 10px 13px;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 11px;
  color: var(--premium-soft);
  background: #f4efe804;
  border: 1px solid #5a6d8369;
  border-bottom-width: 1px;
  border-radius: 9px;
  box-shadow: none;
  transform: none;
  font-size: .77rem;
  font-weight: 600;
  line-height: 1.4;
}
.trail-item.current .lesson-node { color: #0b2425; border-color: var(--aqua); background: var(--aqua); }
.trail-item.complete .lesson-node { color: var(--aqua); background: #83e0d007; border-color: #83e0d03d; }
.lesson-node>span { transform: none; }
.lesson-node .lesson-node-label { font-size: .77rem; }
.lesson-node .lesson-node-arrow { font-size: .95rem; }
.lesson-node:hover:not(:disabled) { border-color: var(--aqua); background: #83e0d014; color: var(--ink); transform: none; }
.trail-item.current .lesson-node:hover { color: #0b2425; background: #a0eadf; }
.lesson-node:active, .trail-item.current .lesson-node:active, .trail-item.complete .lesson-node:active { transform: none; border-bottom-width: 1px; }
.start-bubble { display: none !important; }
.unit-finish { background: #f4efe803; color: var(--muted); border-top: 1px solid #f4efe80d; padding: 12px 23px; font-size: .74rem; text-align: left; }
.unit-finish>span { color: var(--aqua); margin-right: 7px; }
.learning-sidebar { display: grid; gap: 16px; position: sticky; top: 22px; width: auto; }
.path-stats, .quest-card, .path-notebook, .path-help { color: var(--ink); background: var(--panel); border: 1px solid var(--border); border-radius: 16px; box-shadow: none; }
.path-stats { display: grid; grid-template-columns: 1fr 1fr; padding: 20px; }
.path-stats>div { min-width: 0; }
.path-stats>div+div { border-left: 1px solid var(--border); padding-left: 19px; }
.path-stats strong { color: var(--ink); font-size: 1.65rem; font-weight: 550; letter-spacing: -.04em; }
.path-stats small { color: var(--muted); font-size: .74rem; }
.learning-sidebar .stat-symbol, .learning-sidebar .stat-symbol:not(.xp-symbol), .learning-sidebar .xp-symbol { color: var(--coral); font-size: .95rem; }
.learning-sidebar .xp-symbol { color: var(--aqua); }
.quest-card, .path-notebook, .path-help { padding: 23px; }
.quest-card h2, .path-notebook h2, .path-help h2 { color: var(--ink); font-size: 1.2rem; line-height: 1.35; margin: 12px 0 10px; }
.quest-card p, .path-notebook p, .path-help p { color: var(--premium-soft); font-size: .81rem; line-height: 1.65; }
.quest-card small, .path-notebook>small, .path-notebook>span { color: var(--muted); font-size: .75rem; line-height: 1.6; }
.quest-card strong { color: var(--aqua); font-size: .88rem; }
.quest-icon, .learning-sidebar .quest-icon { color: var(--coral); }
.quest-progress, .progress-track { height: 5px; border-radius: 9px; background: #344355; overflow: hidden; }
.quest-progress>span, .progress-track>span { background: var(--aqua); border-radius: 9px; }
.path-notebook>strong { color: var(--ink); font-size: 2.5rem; font-weight: 550; letter-spacing: -.04em; }
.path-notebook>strong>small { color: var(--muted); font-size: 1rem; }
.path-help .path-text { color: var(--aqua); display: block; text-align: left; width: 100%; padding: 10px 0; font-size: .8rem; min-height: 44px; }

/* Daily and practice entrances use the same visual language. */
.page-heading { align-items: flex-end; gap: 25px; margin-bottom: 30px; }
.page-heading h1 { font-size: clamp(2rem, 3.4vw, 3rem); max-width: 790px; margin: 9px 0 12px; }
.page-heading p { font-size: .9rem; color: var(--premium-soft); max-width: 740px; line-height: 1.65; }
.day-label { color: var(--muted); font-size: .78rem; }
.live-dot { background: var(--aqua); box-shadow: 0 0 14px #83e0d035; }
.home-grid { grid-template-columns: minmax(0, 1fr) 305px; gap: 24px; }
.hero-console { background: radial-gradient(ellipse at 90% 12%, #54648125, transparent 55%), linear-gradient(140deg, #1b283a, #101c2a); border-color: #475b736b; border-radius: 23px; padding: 34px; box-shadow: var(--premium-shadow); }
.hero-console h2 { color: var(--ink); font-size: clamp(2.5rem, 4.5vw, 4rem); font-weight: 550; line-height: 1.06; letter-spacing: -.055em; max-width: 560px; margin-top: 30px; }
.hero-console h2 em { color: var(--coral); font-style: normal; }
.hero-description { color: var(--premium-soft); font-size: .93rem; line-height: 1.65; max-width: 530px; }
.tiny-pill { color: var(--premium-soft); border-color: #71859a69; background: #f4efe803; border-radius: 6px; font-size: .64rem; }
.hero-grid-art { opacity: .035; }
.hero-cta { gap: 12px; padding-top: 27px; flex-wrap: wrap; }
.hero-bottom { color: var(--muted); font-size: .78rem; }
.how-to-steps { gap: 17px; margin-top: 25px; padding: 0; border: 0; }
.how-to-steps li>span { border-color: #61748a70; background: #f4efe804; color: var(--aqua); border-radius: 50%; width: 29px; height: 29px; }
.how-to-steps strong { font-size: .88rem; font-weight: 550; }
.how-to-steps small { color: var(--muted); font-size: .8rem; line-height: 1.6; }
.panel { padding: 23px; border-color: var(--border); border-radius: 18px; box-shadow: none; }
.panel-title { color: var(--ink); font-size: .9rem; }
.track-intro { color: var(--muted); font-size: .79rem; line-height: 1.65; }
.track-button { color: var(--ink); background: #f4efe804; border-color: var(--border); padding: 13px 12px; min-height: 69px; }
.track-button.selected { background: #83e0d009; border-color: #83e0d068; }
.track-glyph { background: #f4efe807; color: var(--muted); border: 1px solid #f4efe81a; border-radius: 9px; }
.track-button.selected .track-glyph, .track-check { color: var(--aqua); background: transparent; }
.track-text strong { color: var(--ink); font-size: 1rem; font-weight: 750; line-height: 1.4; }
.track-button.selected .track-text strong { color: var(--aqua); }
.track-text small { color: var(--muted); font-size: .74rem; }
.log-stat strong { color: var(--ink); font-weight: 550; }
.log-stat span, .log-caption { color: var(--muted); font-size: .74rem; }
.catalog-banner { margin-top: 27px; background: #f4efe807; border-color: var(--border); border-radius: 18px; padding: 25px 28px; }
.catalog-banner h2 { color: var(--ink); font-size: 1.55rem; margin-top: 9px; }
.catalog-banner p { color: var(--muted); font-size: .84rem; }
.small-card { border-color: #f4efe814; padding: 24px 0; gap: 15px; }
.small-card h3 { font-size: .9rem; font-weight: 550; }
.small-card p { color: var(--muted); font-size: .8rem; line-height: 1.65; }
.small-icon { color: var(--coral); background: #f28d8808; border-color: #f28d8836; }
.challenge-banner { color: var(--ink); border-color: #83e0d04d; background: #83e0d008; border-radius: 13px; }
.challenge-banner small { color: var(--muted); font-size: .78rem; }

/* Fluid laboratory: quantitative goals remain the visual priority. */
.session-heading { gap: 20px; align-items: center; margin-bottom: 22px; }
.session-title h1 { color: var(--ink); font-weight: 550; font-size: 1.75rem; }
.session-meta { color: var(--muted); gap: 13px; }
.exit-button { min-height: 44px; padding: 9px 13px; border-radius: 9px; border-color: var(--border); color: var(--premium-soft); background: #f4efe803; font-size: .77rem; }
.puzzle-dot { height: 32px; width: 32px; border-radius: 9px; border-color: var(--border); background: #f4efe804; color: var(--muted); font-size: .75rem; }
.puzzle-dot.current { color: #0b2425; background: var(--aqua); border-color: var(--aqua); }
.puzzle-dot.done { color: var(--aqua); background: #83e0d00a; border-color: #83e0d05a; }
.lab-layout { grid-template-columns: minmax(0, 1fr) 315px; gap: 24px; }
.simulation-panel { background: #121c29; border-color: var(--border); border-radius: 21px; padding: 25px; box-shadow: 0 16px 50px #02050b25; }
.mission-tag { color: var(--aqua); background: #83e0d008; border-color: #83e0d03f; font-size: .73rem; }
.moves-count { color: var(--premium-soft); font-size: .79rem; }
.goal-guide { background: #f4efe804; border-color: #50627566; border-radius: 12px; margin: 15px 0; padding: 15px; }
.goal-guide strong { color: var(--ink); font-size: .94rem; }
.goal-guide p { color: var(--premium-soft); font-size: .79rem; line-height: 1.55; }
.goal-tools .text-button { min-height: 44px; font-size: .77rem; padding: 8px 10px; }
.motion-jump { color: var(--aqua); }
.targets { gap: 10px; margin-bottom: 21px; }
.target-metric { background: #0d1622; border: 1px solid #36465a; border-radius: 12px; padding: 14px 12px; }
.target-metric.hit { background: #83e0d00b; border-color: #83e0d070; box-shadow: inset 0 0 0 1px #83e0d006; }
.metric-label { color: var(--ink); font-size: .78rem; line-height: 1.3; font-weight: 550; }
.metric-meaning { color: var(--muted); font-size: .71rem; line-height: 1.35; min-height: 20px; }
.now-label { color: var(--muted); font-size: .64rem; letter-spacing: .1em; }
.metric-number { color: var(--ink); font-size: 1.75rem; font-weight: 550; margin-top: 8px; }
.metric-number small { color: var(--muted); font-size: .73rem; }
.metric-target { color: var(--muted); font-size: .78rem; margin-top: 8px; }
.metric-target strong { color: var(--premium-soft); font-weight: 550; }
.metric-direction { color: var(--coral); font-size: .73rem; line-height: 1.45; min-height: 21px; margin-top: 8px; }
.metric-hit, .target-metric.hit .metric-direction { color: var(--aqua); }
.cell-motion { background: radial-gradient(ellipse at 60% 35%, #28395140, transparent 75%), #0a1420; border-color: #455a7166; border-radius: 18px; }
.cell-motion-heading { color: var(--premium-soft); }
.cell-motion-scale, .cell-motion-caption, .cell-motion-legend { color: var(--muted); }
.cell-motion-inside strong, .cell-motion-outside strong { color: var(--ink); }
.cell-motion-caption { border-color: #f4efe814; }
.cell-motion-direction { background: #83e0d00a; color: var(--aqua); border-color: #83e0d034; }
.scenario-details, .tank-details, .model-details { color: var(--muted); border-color: var(--border); font-size: .8rem; }
.scenario-details summary, .tank-details summary, .model-details summary { color: var(--premium-soft); min-height: 44px; display: flex; align-items: center; }
.mission-description, .scenario-details p, .model-details p { color: var(--premium-soft); font-size: .82rem; line-height: 1.65; }
.model-details code { background: #f4efe808; color: var(--premium-soft); }
.tank-title, .tank-title small, .osmoles, .membrane-label { color: var(--muted); }
.shift-feedback { color: var(--premium-soft); background: #83e0d007; border-color: #83e0d039; font-size: .83rem; border-radius: 11px; }
.shift-symbol { color: var(--aqua); }
.controls-panel { background: #121c29; border-color: var(--border); border-radius: 18px; padding: 22px; }
.controls-panel h2 { color: var(--ink); font-size: 1.1rem; }
.controls-subtitle, .lab-note, .score-rule { color: var(--muted); font-size: .78rem; line-height: 1.6; }
.control-buttons { gap: 9px; }
.move-button { background: #1a2737; color: var(--ink); border-color: #4f647b80; border-radius: 11px; min-height: 70px; padding: 13px; box-shadow: none; }
.move-button:hover:not(:disabled) { background: #25384b; border-color: #83e0d095; }
.move-icon { background: #f4efe804; color: var(--aqua); border-color: #677a9170; }
.move-copy strong { color: var(--ink); font-size: .84rem; font-weight: 550; }
.move-copy small { color: var(--muted); font-size: .75rem; line-height: 1.5; }
.move-button kbd { color: var(--muted); background: transparent; border-color: var(--border); }
.control-tools { border-color: var(--border); gap: 10px; }
.tool-button { color: var(--muted); min-height: 44px; font-size: .78rem; padding: 8px 0; }
.hint-button { position: static; background: #f4efe803; border: 1px solid #586b8269; border-radius: 10px; min-height: 44px; color: var(--premium-soft); font-size: .78rem; padding: 10px; }
.hint-button:hover:not(:disabled) { border-color: var(--aqua); color: var(--ink); background: #83e0d007; }
.move-history { border-color: var(--border); }
.history-list, .history-empty, .spent-label { color: var(--muted); font-size: .78rem; }
.history-list .negative { color: var(--coral); }
.outcome-panel { background: #83e0d008; border-color: #83e0d060; border-radius: 15px; }
.outcome-panel.failed { background: #f28d8807; border-color: #f28d8860; }
.outcome-heading h2 { color: var(--ink); }
.outcome-panel p { color: var(--premium-soft); font-size: .87rem; }
.source-link { color: var(--aqua); font-size: .79rem; line-height: 1.6; }
.stars { color: var(--coral); letter-spacing: .09em; }

/* Guided learning remains quiet and action-led. */
.lesson-progress { gap: 9px; margin-bottom: 22px; }
.lesson-progress>span { border-color: var(--border); color: var(--muted); background: #f4efe803; font-size: .79rem; padding: 9px 14px; }
.lesson-progress .current, .lesson-progress .done { color: var(--aqua); border-color: #83e0d052; background: #83e0d008; }
.lesson-instruction { background: linear-gradient(145deg, #223442, #142130); border-color: #83e0d047; padding: 28px; box-shadow: var(--premium-shadow); }
.lesson-instruction h2 { color: var(--ink); font-size: 1.45rem; line-height: 1.35; font-weight: 550; }
.lesson-instruction>p { color: var(--premium-soft); font-size: .91rem; }
.lesson-instruction .lesson-reassurance { color: var(--aqua); font-size: .8rem; }
.lesson-instruction .lesson-footnote { color: var(--muted); border-color: #f4efe819; font-size: .77rem; }
.lesson-action { background: #83e0d00c; border-color: #83e0d085; box-shadow: 0 0 0 3px #83e0d005; }
.lesson-badge, .lesson-success { color: var(--aqua); font-size: .81rem; }
.lesson-success>span { background: #83e0d00c; border-radius: 9px; }
.lesson-reading { color: var(--muted); font-size: .8rem; }
.lesson-fluid { background: #0d1723; border-color: #547487; }
.lesson-fluid>div { background: linear-gradient(0deg, #31696a, #83e0d076); }
.inside .lesson-fluid { border-color: #b17679; }
.inside .lesson-fluid>div { background: linear-gradient(0deg, #8c505d, #f28d886c); border-color: var(--coral); }
.lesson-compartments span, .lesson-membrane small { color: var(--muted); }

/* Mechanism cases: make the clinical stem and answer options easy to scan. */
.lesson-gamebar { background: #121c29; border-color: var(--border); border-radius: 13px; padding: 15px 18px; gap: 15px; }
.lesson-gamebar strong { color: var(--aqua); font-size: .81rem; }
.lesson-gamebar small { color: var(--muted); font-size: .74rem; }
.lesson-gamebar progress { height: 5px; background: #314154; margin-top: 9px; }
.lesson-gamebar progress::-webkit-progress-bar { background: #314154; }
.lesson-gamebar progress::-webkit-progress-value { background: var(--aqua); }
.lesson-gamebar progress::-moz-progress-bar { background: var(--aqua); }
.choice-layout { max-width: 980px; }
.choice-top { align-items: center; gap: 20px; margin: 22px 0 28px; }
.choice-top h1 { font-size: clamp(1.65rem, 3vw, 2.35rem); font-weight: 550; line-height: 1.18; }
.choice-top p { color: var(--muted); font-size: .85rem; }
.choice-card { padding: 34px; background: #121c29; border-color: #46597080; border-radius: 20px; box-shadow: 0 18px 55px #02050b26; }
.choice-stem { font-size: 1.12rem; line-height: 1.75; color: var(--ink); max-width: 820px; margin-bottom: 29px; }
.answer-grid { gap: 12px; }
.answer-button { background: #192637; color: var(--ink); border: 1px solid #4a5e7680; border-radius: 12px; min-height: 100px; padding: 20px; box-shadow: none; font-size: .91rem; line-height: 1.55; }
.answer-button:not(:disabled):hover { background: #223448; border-color: #83e0d09a; }
.answer-button:not(:disabled):active { transform: translateY(0); border-bottom-width: 1px; }
.answer-letter { width: 32px; height: 32px; min-width: 32px; color: var(--premium-soft); border-color: #5c718b; border-radius: 50%; background: #f4efe803; font-size: .78rem; font-weight: 550; }
.answer-button.wrong { background: #f28d8807; border-color: #f28d884d; color: #e7c4c5; opacity: 1; }
.answer-button.wrong .answer-letter { color: var(--coral); border-color: #f28d8857; }
.answer-button.correct { background: #83e0d00e; border-color: #83e0d087; color: var(--ink); }
.answer-button.correct .answer-letter { color: var(--aqua); border-color: #83e0d087; }
.answer-button:disabled { opacity: 1; }
.choice-tools { color: var(--muted); font-size: .79rem; line-height: 1.65; gap: 20px; margin-top: 23px; }
.choice-tools .hint-button { min-height: 44px; max-width: 260px; flex: none; margin: 0; }
.choice-feedback { background: #83e0d008; border-color: #83e0d052; border-radius: 13px; padding: 24px; margin-top: 25px; }
.choice-feedback h2 { color: var(--aqua); font-weight: 550; font-size: 1.25rem; line-height: 1.4; }
.choice-feedback p { color: var(--premium-soft); font-size: .91rem; line-height: 1.75; }
.choice-feedback.incorrect { background: #f28d8807; border-color: #f28d884b; }
.choice-feedback.incorrect h2 { color: var(--coral); }
.choice-feedback.incorrect p { color: var(--premium-soft); }

/* Collection and scorecards retain the same premium hierarchy. */
.collection-progress { background: #121c29; border-color: var(--border); border-radius: 17px; padding: 25px 28px; }
.collection-progress strong { color: var(--ink); font-size: 2.1rem; font-weight: 550; }
.collection-progress strong small { color: var(--muted); }
.collection-progress span, .collection-bar p, .library-count { color: var(--muted); font-size: .79rem; }
.library-filters { margin-top: 30px; }
.filter-chip { min-height: 44px; padding: 10px 16px; color: var(--premium-soft); background: #121c29; border-color: var(--border); border-radius: 10px; font-size: .81rem; }
.filter-chip.selected { color: var(--aqua); background: #83e0d00b; border-color: #83e0d065; }
.filter-chip span { color: var(--muted); font-size: .72rem; }
.search-label, .category-label { color: var(--muted); font-size: .76rem; }
.search-label input, .category-label select { color: var(--ink); background: #121c29; border-color: #4d617780; min-height: 48px; border-radius: 9px; font-size: .85rem; }
.search-label input::placeholder { color: #9aabba; opacity: 1; }
.unsolved-filter { color: var(--premium-soft); font-size: .81rem; min-height: 48px; }
.unsolved-filter input { accent-color: var(--aqua); }
.puzzle-grid { gap: 18px; }
.puzzle-card { background: linear-gradient(135deg, #1a2737, #121c29); border-color: #384b6180; border-radius: 17px; padding: 24px; box-shadow: 0 12px 28px #02050b14; }
.puzzle-card:hover { border-color: #748699; transform: translateY(-2px); }
.puzzle-card h2 { color: var(--ink); font-size: 1.3rem; line-height: 1.3; font-weight: 550; margin: 12px 0; }
.puzzle-card p { color: var(--premium-soft); font-size: .84rem; line-height: 1.7; }
.puzzle-category { color: var(--muted); font-size: .69rem; letter-spacing: .1em; }
.puzzle-code { color: var(--muted); font-size: .74rem; }
.difficulty-tag { border-radius: 6px; padding: 5px 8px; font-size: .69rem; font-weight: 550; }
.difficulty-tag.student { color: var(--aqua); background: #83e0d00c; border-color: #83e0d030; }
.difficulty-tag.resident { color: #dfd6c8; background: #f4efe809; border-color: #f4efe824; }
.difficulty-tag.fellow { color: var(--coral); background: #f28d880c; border-color: #f28d8830; }
.puzzle-card-meta { color: var(--muted); font-size: .78rem; border-color: #f4efe811; }
.unsolved-label { color: var(--muted); }
.empty-library { color: var(--premium-soft); background: #121c29; border-color: var(--border); }
.result-heading h1 { color: var(--ink); font-weight: 550; }
.score-card { align-self: start; background: radial-gradient(ellipse at 100% 0%, #83e0d010, transparent 65%), linear-gradient(140deg, #1f3040, #121e2b); border-color: #536b8280; border-radius: 20px; padding: 32px; }
.score-number { color: var(--ink); font-size: 5.5rem; font-weight: 500; margin: 18px 0; letter-spacing: -.075em; }
.score-number small { color: var(--muted); font-size: 1.05rem; letter-spacing: -.01em; }
.result-tiles { gap: 9px; }
.result-tile { background: #f4efe805; border-color: #536b8270; border-radius: 10px; color: var(--coral); }
.score-meta { color: var(--muted); font-size: .8rem; line-height: 1.6; flex-wrap: wrap; gap: 5px 17px; }
.share-panel { border-radius: 20px; }
.share-panel h2 { color: var(--ink); font-size: 1.6rem; font-weight: 550; }
.share-panel p { color: var(--premium-soft); font-size: .88rem; line-height: 1.7; }
.share-panel .small-print { color: var(--muted); font-size: .76rem; }
.review-heading { border-color: var(--border); }
.review-heading h2 { color: var(--ink); font-size: 1.3rem; }
.review-heading span { color: var(--muted); font-size: .78rem; }
.review-item { border-color: var(--border); background: #121c29; border-radius: 13px; padding: 0 20px; }
.review-item summary { min-height: 77px; padding: 17px 0; }
.review-index { color: var(--aqua); background: #83e0d00a; border: 1px solid #83e0d02f; border-radius: 50%; width: 30px; height: 30px; }
.review-summary-text strong { color: var(--ink); font-size: .89rem; line-height: 1.4; font-weight: 550; }
.review-summary-text small { color: var(--muted); font-size: .76rem; line-height: 1.6; margin-top: 4px; }
.review-body { color: var(--premium-soft); font-size: .88rem; line-height: 1.7; }
.lesson-celebration { background: linear-gradient(120deg, #1e323b, #172330); border-color: #83e0d051; border-radius: 20px; padding: 29px; justify-content: flex-start; gap: 24px; }
.lesson-celebration h1 { color: var(--ink); font-size: 2.15rem; font-weight: 550; }
.lesson-celebration p { color: var(--premium-soft); font-size: .86rem; }
.xp-gain { color: var(--aqua); font-weight: 650; }
.celebration-stars { display: none; }
dialog { background: #152130; color: var(--ink); border-color: #5c70857a; border-radius: 21px; padding: 29px; box-shadow: 0 25px 100px #0009; max-width: 600px; }
dialog::backdrop { background: #02050bd6; backdrop-filter: blur(9px); }
.dialog-heading h2 { color: var(--ink); font-size: 1.6rem; line-height: 1.2; font-weight: 550; }
.dialog-copy { color: var(--premium-soft); font-size: .92rem; line-height: 1.75; }
.dialog-copy .small-print { color: var(--muted); font-size: .79rem; }
.dialog-footer { flex-wrap: wrap; }
.toast { color: var(--ink); background: #213347; border-color: #6f859980; border-radius: 11px; box-shadow: 0 8px 35px #02050b77; font-size: .84rem; }
.error-panel { color: var(--premium-soft); background: #121c29; border-color: var(--border); }

@media (min-width: 1500px) {
  .learning-hero { gap: 60px; padding-top: 22px; padding-bottom: 57px; }
}
@media (max-width: 1100px) {
  .app-shell { --nr-page-gutter: 30px; padding: 0 var(--nr-page-gutter); }
  .learning-hero { gap: 26px; }
  .learning-hero h1 { font-size: clamp(3rem, 5.9vw, 4.5rem); }
  .learning-layout { grid-template-columns: minmax(0, 1fr) 250px; gap: 23px; }
  .atlas-topic-buttons { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .hero-actions .path-primary { min-width: 0; }
  .kidney-welcome, .kidney-welcome .cinematic-scene { min-height: 410px; }
  .lab-layout { grid-template-columns: minmax(0, 1fr) 286px; gap: 18px; }
  .simulation-panel { padding: 20px; }
  .controls-panel { padding: 18px; }
  .goal-guide { align-items: flex-start; }
  .goal-tools { flex: none; }
  .metric-number { font-size: 1.55rem; }
}
@media (max-width: 900px) {
  .learning-layout { grid-template-columns: minmax(0, 1fr); }
  .learning-sidebar { position: static; grid-template-columns: repeat(2, minmax(0, 1fr)); align-items: stretch; gap: 15px; }
  .path-stats { min-height: 145px; align-items: center; }
  .quest-card { min-width: 0; }
  .path-notebook, .path-help { display: block; }
  .home-grid { grid-template-columns: minmax(0, 1fr) 280px; gap: 18px; }
  .hero-console { padding: 27px; }
  .page-heading { align-items: flex-start; }
  .page-heading .secondary-button { flex: none; }
}
@media (max-width: 760px) {
  :root { --nr-header-clearance: 124px; }
  html { scroll-padding-bottom: 290px; }
  .app-shell { --nr-page-gutter: 18px; padding: 0 var(--nr-page-gutter); }
  .site-header, .learning-screen .site-header { flex-wrap: wrap; gap: 6px; padding: 8px var(--nr-page-gutter) 0; align-items: center; }
  .site-header .brand, .learning-screen .site-header .brand { font-size: 1.3rem; gap: 8px; }
  .site-header>.icon-button { margin-left: auto; width: 40px; height: 44px; border: 0; }
  .brand .ren-orb, #brand-mascot .ren-orb { --orb-size: 30px; }
  .site-nav, .site-header nav { order: 3; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); width: 100%; margin: 0; padding: 2px 0 8px; gap: 3px; border-top: 0; }
  .site-header .nav-button, .learning-screen .site-header .nav-button { min-height: 44px; padding: 9px 5px; font-size: 14px; border-radius: 8px; text-align: center; }
  main { padding: 26px 0 38px; min-height: 600px; }
  .primary-button, .secondary-button, .path-primary { min-height: 48px; padding: 13px 17px; font-size: .83rem; }
  .learning-hero { display: flex; flex-direction: column; align-items: stretch; gap: 25px; padding: 0 0 34px; }
  .learning-hero-copy { display: block; width: 100%; grid-column: auto; grid-row: auto; }
  .learning-hero-copy>.path-eyebrow { display: block; grid-column: auto; }
  .learning-hero h1 { grid-column: auto; grid-row: auto; font-size: clamp(2.75rem, 8.8vw, 4rem); line-height: 1.045; max-width: 620px; margin: 16px 0 18px; }
  .learning-hero-copy>p { grid-column: auto; grid-row: auto; font-size: .91rem; line-height: 1.65; max-width: 490px; margin: 0 0 23px; }
  .learning-hero-copy>.hero-tagline { max-width: none; margin: 0 0 10px; font-size: clamp(1.125rem, 4.8vw, 1.3rem); white-space: normal; }
  .learning-hero-copy>.hero-route { max-width: none; margin: 0 0 10px; font-size: 1rem; white-space: normal; }
  .learning-hero-copy>.hero-instructions { margin-bottom: 23px; }
  .hero-actions { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 9px; }
  .hero-actions .path-primary, .hero-actions .secondary-button { width: 100%; min-width: 0; max-width: none; padding: 12px; justify-content: center; gap: 7px; }
  .hero-actions .path-primary>span { margin-left: 0; }
  .hero-lesson-context { font-size: .8125rem; gap: 3px 12px; margin-top: 13px; }
  .path-track-tabs { grid-column: auto; grid-row: auto; gap: 6px; max-width: none; margin-top: 22px; }
  .path-track-tabs button { min-height: 59px; padding: 10px 11px; border-width: 1px; border-bottom-width: 1px; border-radius: 9px; }
  .path-track-tabs button strong { font-size: .95rem; }
  .path-track-tabs button small { font-size: .8125rem; }
  .kidney-welcome { position: relative; inset: auto; grid-column: auto; grid-row: auto; width: 100%; min-height: 270px; height: auto; align-self: auto; }
  .kidney-welcome .cinematic-scene { height: 270px; min-height: 270px; border-radius: 18px; }
  #kidney-cinematic .nk-cinematic { width: min(100%, 235px); }
  #kidney-cinematic .nk-cinematic__caption { flex-wrap: nowrap; gap: 8px; }
  #kidney-cinematic .nk-cinematic__caption>span { white-space: normal; min-width: 0; flex: 1; text-align: left; }
  #kidney-cinematic .nk-cinematic__toggle { flex: none; }
  .kidney-scene-fallback { height: 270px; max-width: 270px; }
  .kidney-visual-note { display: flex; flex-direction: column; gap: 10px; margin-top: 20px; }
  .kidney-visual-note>span:first-child { font-size: 28px; }
  .learning-layout { display: grid; grid-template-columns: minmax(0, 1fr); gap: 25px; }
  .journey-column { display: block; order: 0; width: 100%; }
  .learning-sidebar { order: 1; width: 100%; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); position: static; gap: 12px; }
  .journey-heading, .path-intro { margin: 0 0 15px; gap: 13px; flex-direction: column; align-items: flex-start; width: auto; }
  .journey-heading h2, .path-intro h2 { font-size: 1.55rem; }
  .journey-heading p, .journey-heading span, .path-intro>span { font-size: .78rem; }
  .path-legend { order: initial; margin: 0 0 19px; font-size: .8rem; width: auto; }
  .atlas-topic-buttons { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; margin-bottom: 23px; }
  .atlas-topic-buttons button { grid-template-columns: 25px minmax(0, 1fr); min-height: 80px; padding: 13px; font-size: .79rem; gap: 10px; }
  .atlas-topic-buttons button>svg { width: 25px; height: 25px; }
  .atlas-topic-buttons button>span:not(.topic-arrow) { font-size: .76rem; }
  .atlas-topic-buttons .topic-arrow { display: none; }
  .next-lesson-card { order: initial; width: auto; flex-direction: column; align-items: stretch; padding: 21px; gap: 15px; border-width: 1px; margin-bottom: 24px; }
  .next-lesson-card .path-primary { width: 100%; max-width: none; justify-content: space-between; }
  .course-path { order: initial; width: auto; gap: 11px; }
  .path-unit { border-radius: 13px; border-width: 1px; }
  .path-unit summary { min-height: 82px; padding: 17px; gap: 11px; }
  .path-unit summary small { font-size: .65rem; line-height: 1.5; letter-spacing: .06em; margin-bottom: 4px; }
  .path-unit summary strong { font-size: .94rem; line-height: 1.4; }
  .unit-number { width: 36px; height: 39px; font-size: .75rem; border-radius: 9px; }
  .unit-description { margin: 17px 17px 7px; color: var(--premium-soft); font-size: .8rem; }
  .lesson-trail { padding: 5px 17px 12px; margin: 0; gap: 0; width: auto; max-width: none; }
  .trail-item, .trail-item.trail-0, .trail-item.trail-1, .trail-item.trail-2, .trail-item.trail-3 { grid-template-columns: 25px minmax(0, 1fr) auto; min-height: 89px; gap: 9px; padding: 14px 0; }
  .lesson-index { width: 25px; height: 25px; font-size: .62rem; }
  .trail-label { max-width: none; padding: 0; background: transparent; }
  .trail-label strong { font-size: .81rem; line-height: 1.45; }
  .trail-label span { font-size: .71rem; line-height: 1.45; }
  .lesson-node, .trail-item.current .lesson-node, .trail-item.complete .lesson-node { width: auto; height: auto; min-width: 78px; min-height: 44px; padding: 9px; gap: 7px; border-radius: 8px; border-bottom-width: 1px; font-size: .72rem; box-shadow: none; transform: none; }
  .lesson-node .lesson-node-label { font-size: .72rem; }
  .lesson-node .lesson-node-arrow { font-size: .85rem; }
  .unit-finish { padding: 12px 17px; font-size: .72rem; }
  .path-stats { grid-column: 1/-1; min-height: 0; padding: 20px; }
  .path-stats strong { font-size: 1.8rem; }
  .path-stats small { font-size: .76rem; }
  .quest-card { display: block; grid-column: 1/-1; padding: 22px; }
  .quest-card h2 { font-size: 1.25rem; margin: 9px 0; }
  .quest-card p { font-size: .83rem; }
  .quest-progress { margin: 18px 0 12px; }
  .quest-card>small { display: block; margin-top: 8px; }
  .path-notebook, .path-help { display: block; grid-column: 1/-1; padding: 22px; }
  .page-heading { gap: 17px; margin-bottom: 23px; flex-direction: column; align-items: stretch; }
  .page-heading h1 { font-size: 2.05rem; line-height: 1.12; margin-bottom: 10px; }
  .page-heading p { font-size: .86rem; }
  .day-label { font-size: .77rem; }
  .home-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 19px; }
  .hero-console { min-height: 0; padding: 25px; border-radius: 18px; }
  .hero-console h2 { font-size: clamp(2.5rem, 8vw, 3.4rem); margin: 27px 0 17px; }
  .hero-description { font-size: .86rem; line-height: 1.7; }
  .console-top { gap: 9px; }
  .console-top .eyebrow { font-size: .62rem; }
  .tiny-pill { font-size: .6rem; white-space: nowrap; }
  .hero-cta { gap: 9px; padding-top: 23px; flex-direction: column; align-items: stretch; }
  .hero-cta .primary-button, .hero-cta .text-button { width: 100%; justify-content: space-between; }
  .hero-bottom { font-size: .76rem; }
  .how-to-steps { order: initial; margin: 23px 0 0; padding: 0; border: 0; gap: 17px; }
  .how-to-steps strong { font-size: .84rem; }
  .how-to-steps small { font-size: .78rem; }
  .sidebar { gap: 17px; }
  .panel { padding: 22px; border-radius: 16px; }
  .catalog-banner { flex-direction: column; align-items: stretch; padding: 23px; gap: 15px; border-radius: 16px; }
  .catalog-banner h2 { font-size: 1.4rem; }
  .catalog-banner p { font-size: .81rem; }
  .catalog-banner .secondary-button { width: 100%; }
  .below-home { grid-template-columns: 1fr; gap: 0; }
  .session-heading { align-items: flex-start; gap: 13px; margin-bottom: 18px; }
  .session-title h1 { font-size: 1.35rem; line-height: 1.2; margin: 8px 0 0; }
  .session-title .eyebrow { font-size: .62rem; }
  .session-meta { gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
  .puzzle-dot { width: 26px; height: 28px; font-size: .68rem; border-radius: 7px; }
  .puzzle-strip { gap: 4px; }
  .exit-button { min-height: 44px; padding: 8px 10px; font-size: .72rem; }
  .lab-layout { display: flex; flex-direction: column; gap: 16px; padding-bottom: 285px; }
  .simulation-panel { width: 100%; padding: 16px; border-radius: 17px; }
  .mission-top { gap: 8px; }
  .mission-tag { font-size: .68rem; padding: 5px 7px; }
  .moves-count { font-size: .74rem; }
  .goal-guide { display: block; padding: 12px; margin: 12px 0; }
  .goal-guide strong { font-size: .88rem; }
  .goal-guide p { font-size: .76rem; line-height: 1.5; max-width: none; margin: 6px 0 3px; }
  .goal-tools { flex-direction: row; align-items: center; justify-content: flex-start; gap: 5px; margin-top: 4px; }
  .goal-tools .text-button { min-height: 44px; padding: 8px 6px; font-size: .72rem; }
  .motion-jump { font-size: .72rem; }
  .targets { gap: 7px; margin-bottom: 15px; }
  .target-metric { padding: 10px 8px; border-radius: 10px; }
  .metric-label { font-size: .71rem; min-height: 18px; line-height: 1.35; margin-bottom: 1px; }
  .metric-meaning { font-size: .64rem; min-height: 18px; line-height: 1.35; }
  .metric-number { font-size: 1.45rem; margin-top: 6px; }
  .metric-number small { font-size: .65rem; display: inline-block; }
  .now-label { font-size: .6rem; }
  .metric-target { font-size: .7rem; line-height: 1.45; margin-top: 6px; }
  .metric-target strong { display: block; }
  .metric-direction { font-size: .66rem; min-height: 19px; line-height: 1.35; margin-top: 6px; }
  .cell-motion { margin-top: 17px; border-radius: 13px; }
  .cell-motion-heading { padding: 13px 14px 0; }
  .cell-motion-caption { margin: 0 14px; }
  .scenario-details, .model-details { font-size: .78rem; }
  .mission-description, .scenario-details p, .model-details p { font-size: .8rem; }
  .lab-layout .controls-panel {
    position: fixed;
    inset: auto 10px max(8px, env(safe-area-inset-bottom)) 10px;
    width: auto;
    z-index: 20;
    padding: 11px;
    border: 1px solid #62778e9c;
    border-radius: 15px;
    background: #152130f7;
    backdrop-filter: blur(18px);
    box-shadow: 0 -12px 36px #02050b9c;
  }
  .lab-layout .controls-panel.solved { display: none; }
  .lab-layout:has(.controls-panel.solved) { padding-bottom: 0; }
  .controls-panel h2, .controls-subtitle, .lab-note, .controls-panel .storage-notice, .controls-panel .score-rule { display: none; }
  .control-buttons { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 7px; }
  .controls-panel .move-button { min-height: 67px; padding: 8px 5px; gap: 0; justify-content: center; text-align: center; border-radius: 9px; background: #203247; }
  .controls-panel .move-icon, .controls-panel .move-button kbd { display: none; }
  .controls-panel .move-copy { min-width: 0; }
  .controls-panel .move-copy strong { font-size: .76rem; line-height: 1.3; }
  .controls-panel .move-copy small { font-size: .68rem; line-height: 1.35; color: #b6c3d0; margin-top: 3px; }
  .controls-panel .control-tools { margin-top: 7px; padding: 3px 0 0; gap: 9px; justify-content: flex-start; }
  .controls-panel .tool-button { min-height: 44px; padding: 8px 0; font-size: .73rem; }
  .controls-panel .tool-button:last-child { margin-left: auto; }
  .controls-panel .hint-button { position: static; width: 100%; min-height: 44px; padding: 8px 6px; margin-top: 1px; font-size: .73rem; line-height: 1.35; }
  .controls-panel #hint { display: none; }
  .outcome-panel { scroll-margin-bottom: 310px; padding: 18px; }
  .outcome-heading { gap: 10px; }
  .outcome-heading h2 { font-size: 1.12rem; }
  .outcome-panel p { font-size: .83rem; }
  .lesson-layout { display: flex; flex-direction: column; gap: 16px; }
  .lesson-instruction { order: -1; padding: 23px; border-radius: 17px; }
  .lesson-instruction h2 { font-size: 1.3rem; margin: 12px 0; line-height: 1.35; }
  .lesson-instruction>p { font-size: .88rem; line-height: 1.65; margin-bottom: 13px; }
  .lesson-instruction .lesson-reassurance { font-size: .78rem; }
  .lesson-action { min-height: 70px; margin-top: 17px; padding: 12px 14px; justify-content: flex-start; text-align: left; }
  .lesson-action .move-icon { display: grid; }
  .lesson-action .move-copy strong { font-size: .93rem; }
  .lesson-action .move-copy small { font-size: .77rem; }
  .lesson-progress { margin-bottom: 18px; gap: 7px; }
  .lesson-progress>span { font-size: .74rem; padding: 9px 12px; }
  .lesson-model h2 { font-size: 1.25rem; }
  .lesson-model .metric-meaning { min-height: 18px; }
  .lesson-reading { text-align: left; font-size: .78rem; }
  .lesson-gamebar { padding: 13px; gap: 10px; margin-bottom: 21px; border-radius: 12px; }
  .lesson-gamebar .ren-orb { --orb-size: 33px; }
  .lesson-gamebar strong { font-size: .74rem; line-height: 1.45; }
  .lesson-gamebar small { font-size: .68rem; line-height: 1.4; }
  .lesson-gamebar .exit-button { font-size: .68rem; max-width: 80px; padding: 8px; }
  .choice-top { align-items: flex-start; gap: 13px; margin: 12px 0 21px; }
  .choice-top .ren-orb { --orb-size: 45px; }
  .choice-top h1 { font-size: 1.5rem; line-height: 1.2; margin: 8px 0; }
  .choice-top .eyebrow { font-size: .62rem; line-height: 1.6; }
  .choice-top p { font-size: .79rem; line-height: 1.6; }
  .choice-card { padding: 23px 19px; border-radius: 17px; }
  .choice-stem { font-size: .98rem; line-height: 1.75; margin-bottom: 23px; }
  .answer-grid { grid-template-columns: minmax(0, 1fr); gap: 10px; }
  .answer-button { min-height: 76px; padding: 15px 13px; gap: 12px; font-size: .88rem; line-height: 1.6; border-radius: 11px; }
  .answer-letter { width: 29px; height: 29px; min-width: 29px; font-size: .75rem; }
  .choice-tools { flex-direction: column; align-items: stretch; gap: 12px; font-size: .77rem; margin-top: 20px; }
  .choice-tools .hint-button { width: 100%; max-width: none; font-size: .78rem; }
  .choice-feedback { padding: 19px; border-radius: 11px; }
  .choice-feedback h2 { font-size: 1.13rem; }
  .choice-feedback p { font-size: .87rem; line-height: 1.75; }
  .choice-feedback .primary-button { width: 100%; }
  .collection-progress { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; padding: 23px; border-radius: 15px; }
  .collection-progress strong { font-size: 1.85rem; }
  .collection-progress span, .collection-bar p { font-size: .75rem; }
  .collection-bar { grid-column: 1/-1; width: 100%; }
  .library-filters { gap: 17px; margin-top: 25px; }
  .library-tracks { gap: 7px; }
  .filter-chip { min-height: 44px; font-size: .75rem; padding: 9px 12px; }
  .library-search-row { flex-direction: column; align-items: stretch; gap: 15px; }
  .search-label, .category-label { width: 100%; font-size: .76rem; }
  .search-label input, .category-label select { width: 100%; font-size: .86rem; }
  .unsolved-filter { width: 100%; font-size: .8rem; }
  .puzzle-grid { grid-template-columns: minmax(0, 1fr); gap: 15px; }
  .puzzle-card { padding: 23px; border-radius: 16px; }
  .puzzle-card h2 { font-size: 1.3rem; }
  .puzzle-card p { font-size: .86rem; }
  .puzzle-card-meta { font-size: .78rem; }
  .result-grid { grid-template-columns: minmax(0, 1fr); gap: 18px; }
  .score-card { padding: 25px; border-radius: 17px; }
  .score-number { font-size: 4.8rem; margin: 13px 0 19px; }
  .score-number small { font-size: .9rem; }
  .share-panel { padding: 24px; border-radius: 17px; }
  .share-panel h2 { font-size: 1.4rem; }
  .share-panel p { font-size: .86rem; }
  .score-meta { font-size: .77rem; }
  .review-heading { align-items: flex-start; flex-direction: column; gap: 7px; }
  .review-heading span { font-size: .76rem; }
  .review-item { padding: 0 15px; }
  .review-item summary { gap: 10px; }
  .review-summary-text strong { font-size: .84rem; }
  .review-summary-text small { font-size: .73rem; }
  .review-body { font-size: .85rem; }
  .review-item summary>.stars { font-size: .73rem; letter-spacing: .01em; white-space: nowrap; }
  .lesson-celebration { padding: 23px 20px; gap: 13px; align-items: flex-start; }
  .lesson-celebration .ren-orb { --orb-size: 56px; }
  .lesson-celebration h1 { font-size: 1.55rem; line-height: 1.2; }
  .lesson-celebration p { font-size: .82rem; line-height: 1.6; }
  .lesson-celebration .primary-button { font-size: .8rem; padding: 12px 15px; }
  .xp-gain { display: block; margin-bottom: 8px; }
  .result-actions { flex-direction: column; gap: 9px; }
  .result-actions button { width: 100%; }
  .source-link { font-size: .77rem; }
  .site-footer, .learning-screen .site-footer { gap: 10px; line-height: 1.65; font-size: .72rem; padding: 19px 0 25px; }
  dialog { width: calc(100% - 24px); padding: 23px; border-radius: 17px; max-height: calc(100dvh - 32px); }
  .dialog-heading { align-items: flex-start; gap: 10px; }
  .dialog-heading h2 { font-size: 1.4rem; }
  .dialog-copy { font-size: .88rem; line-height: 1.75; }
  .dialog-footer { flex-direction: column; }
  .dialog-footer button { width: 100%; }
  .toast { font-size: .78rem; padding: 12px 16px; }
}
@media (max-width: 370px) {
  .site-header .brand, .learning-screen .site-header .brand { font-size: 1.2rem; gap: 7px; }
  .app-shell { --nr-page-gutter: 14px; padding: 0 var(--nr-page-gutter); }
  .site-header .nav-button, .learning-screen .site-header .nav-button { font-size: 14px; padding-inline: 3px; }
  main { padding-top: 24px; }
  .learning-hero h1 { font-size: 2.65rem; margin: 15px 0 17px; }
  .learning-hero-copy>p { font-size: .88rem; }
  .hero-actions { grid-template-columns: minmax(0, 1fr); gap: 8px; }
  .hero-actions .path-primary, .hero-actions .secondary-button { min-height: 48px; }
  .path-track-tabs button { padding: 10px 9px; }
  .path-track-tabs button strong { font-size: .9rem; }
  .path-track-tabs button small { font-size: .8125rem; }
  .kidney-welcome { height: auto; min-height: 270px; }
  .kidney-welcome .cinematic-scene { height: 270px; min-height: 270px; }
  .atlas-topic-buttons button { padding: 12px; font-size: .76rem; }
  .path-unit summary { padding: 15px; gap: 10px; }
  .path-unit summary strong { font-size: .9rem; }
  .unit-description { margin-inline: 15px; }
  .lesson-trail { padding-inline: 15px; }
  .trail-item, .trail-item.trail-0, .trail-item.trail-1, .trail-item.trail-2, .trail-item.trail-3 { grid-template-columns: minmax(0, 1fr) auto; gap: 9px; }
  .lesson-index { display: none; }
  .trail-label { grid-column: 1; }
  .lesson-node, .trail-item.current .lesson-node, .trail-item.complete .lesson-node { grid-column: 2; min-width: 74px; }
  .trail-label strong { font-size: .8rem; }
  .hero-console { padding: 22px; }
  .hero-console h2 { font-size: 2.5rem; }
  .page-heading h1 { font-size: 1.9rem; }
  .lab-layout { padding-bottom: 285px; }
  .simulation-panel { padding: 13px; }
  .goal-guide { padding: 11px; }
  .goal-guide p { font-size: .73rem; }
  .targets { gap: 6px; }
  .target-metric { padding: 9px 6px; }
  .metric-label { font-size: .67rem; }
  .metric-number { font-size: 1.28rem; }
  .metric-meaning { font-size: .62rem; }
  .metric-target { font-size: .67rem; }
  .metric-direction { font-size: .64rem; }
  .metric-number small { font-size: .63rem; }
  .session-title h1 { font-size: 1.25rem; }
  .session-meta { gap: 6px; }
  .puzzle-dot { width: 23px; }
  .lab-layout .controls-panel { left: 8px; right: 8px; padding: 10px; }
  .controls-panel .move-copy strong { font-size: .73rem; }
  .controls-panel .move-copy small { font-size: .66rem; }
  .controls-panel .tool-button { font-size: .71rem; }
  .lesson-instruction { padding: 21px; }
  .lesson-progress>span { padding: 8px 10px; font-size: .71rem; }
  .choice-top .ren-orb { --orb-size: 37px; }
  .choice-top { gap: 10px; }
  .choice-top h1 { font-size: 1.38rem; }
  .choice-card { padding: 21px 16px; }
  .choice-stem { font-size: .94rem; }
  .answer-button { font-size: .85rem; padding: 14px 12px; }
  .choice-feedback { padding: 16px; }
  .collection-progress { padding: 21px; gap: 16px; }
  .collection-progress strong { font-size: 1.65rem; }
  .filter-chip { font-size: .71rem; padding-inline: 10px; }
  .puzzle-card { padding: 21px; }
  .score-card { padding: 22px; }
  .score-number { font-size: 4.2rem; }
  .score-number small { font-size: .8rem; }
  .lesson-celebration { flex-direction: column; padding: 22px; }
  .lesson-celebration .ren-orb { --orb-size: 48px; }
  dialog { padding: 21px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; }
  .primary-button, .secondary-button, .path-primary, .lesson-node, .answer-button, .puzzle-card, .toast { transition: none; }
  .primary-button:hover, .path-primary:hover, .puzzle-card:hover { transform: none; }
}

/* Short phones keep the three numeric goals above the fluid controls. */
@media (max-width: 760px) and (max-height: 700px) {
  #main:has(.lab-layout) { padding-top: 12px; }
  .lesson-gamebar:has(+.session-heading) { padding: 8px 10px; gap: 9px; margin-bottom: 10px; }
  .lesson-gamebar:has(+.session-heading) .ren-orb { display: none; }
  .lesson-gamebar:has(+.session-heading) strong { font-size: .72rem; line-height: 1.35; }
  .lesson-gamebar:has(+.session-heading) small { font-size: .66rem; }
  .lesson-gamebar:has(+.session-heading) progress { height: 3px; margin-top: 5px; }
  .session-heading:has(+.lab-layout) { margin-bottom: 10px; gap: 9px; align-items: center; }
  .session-heading:has(+.lab-layout) .session-title h1 { font-size: 1.1rem; line-height: 1.2; margin-top: 4px; }
  .session-heading:has(+.lab-layout) .session-title .eyebrow { font-size: .6rem; line-height: 1.4; }
  .session-heading:has(+.lab-layout) .session-meta { gap: 5px; }
  .session-heading:has(+.lab-layout) .puzzle-strip { display: none; }
  .lab-layout { padding-bottom: 238px; }
  .lab-layout .simulation-panel { padding: 10px; }
  .lab-layout .mission-top { margin-bottom: 5px; }
  .lab-layout .mission-tag { font-size: .66rem; padding: 4px 6px; }
  .lab-layout .moves-count { font-size: .71rem; }
  .lab-layout .goal-guide { display: grid; grid-template-columns: minmax(0, 1fr) 59px; gap: 8px; margin: 7px 0; padding: 9px; }
  .lab-layout .goal-guide strong { font-size: .8rem; }
  .lab-layout .goal-guide p { font-size: .7rem; line-height: 1.4; margin: 3px 0 0; }
  .lab-layout .goal-tools { display: block; width: auto; margin: 0; align-self: center; }
  .lab-layout #goals-count { display: block; color: var(--aqua); font-size: .67rem; line-height: 1.45; }
  .lab-layout .goal-tools .motion-jump { display: none; }
  .lab-layout .targets { gap: 6px; margin-bottom: 11px; }
  .lab-layout .target-metric { padding: 8px 6px; }
  .lab-layout .metric-label { font-size: .67rem; line-height: 1.3; min-height: 0; }
  .lab-layout .metric-meaning, .lab-layout .metric-direction { display: none; }
  .lab-layout .metric-number { font-size: 1.3rem; line-height: 1.2; margin-top: 4px; }
  .lab-layout .now-label { font-size: .66rem; }
  .lab-layout .target-metric.hit .now-label::before { content: "✓ "; color: var(--aqua); }
  .lab-layout .metric-number small { font-size: .65rem; }
  .lab-layout .metric-target { font-size: .68rem; line-height: 1.35; margin-top: 4px; }
  .lab-layout .metric-target strong { display: block; }
  .lab-layout .controls-panel { padding: 9px; border-radius: 13px; }
  .lab-layout .control-buttons { gap: 6px; }
  .lab-layout .controls-panel .move-button { min-height: 52px; padding: 6px 4px; }
  .lab-layout .controls-panel .move-copy strong { font-size: .71rem; line-height: 1.3; }
  .lab-layout .controls-panel .move-copy small { font-size: .64rem; line-height: 1.3; margin-top: 2px; }
  .lab-layout .controls-panel .control-tools { margin-top: 4px; padding-top: 2px; }
  .lab-layout .controls-panel .tool-button { min-height: 44px; font-size: .7rem; padding: 7px 0; }
  .lab-layout .controls-panel .hint-button { min-height: 44px; margin-top: 0; padding: 7px 5px; font-size: .72rem; }
}

/* Sequential lesson access: retain readable previews of locked stops. */
.stage-lock-notice{margin:18px 0;padding:18px 20px;background:#f4bb6410;border:1px solid #b28c52;border-radius:16px;color:#f6debc}
.stage-lock-notice strong{display:block;font-size:1.05rem;line-height:1.4;color:#ffd29b}
.stage-lock-notice p{margin:9px 0;font-size:.95rem;line-height:1.55;color:#e5d5c0}
.stage-lock-notice .path-text{color:#9fe6d5;font-size:.94rem}
.stage-lesson-row.is-locked{border-color:#526573;background:#152532}
.stage-lesson-row.is-locked .stage-lesson-copy strong{color:#ced8e0}
.stage-lesson-row.is-locked .stage-lesson-copy>span{color:#b8c5d0}
.stage-primary .path-primary:disabled,.stage-lesson-action:disabled,.lesson-node:disabled{cursor:not-allowed;background:#293c4a;color:#c2ccd5;border-color:#506170;box-shadow:none;transform:none;filter:none;opacity:1}

/* Keep both the model and controls reachable on a short phone viewport. */
@media (max-width: 760px) and (max-height: 500px) {
  html { scroll-padding-bottom: 24px; }
  .lab-layout { padding-bottom: 0; }
  .lab-layout .controls-panel {
    position: static;
    inset: auto;
    width: 100%;
    box-shadow: none;
    backdrop-filter: none;
  }
  .outcome-panel { scroll-margin-bottom: 24px; }
}
@media(max-width:760px){.stage-lock-notice{padding:15px 16px}.stage-lock-notice strong{font-size:1rem}.stage-lock-notice p{font-size:.9rem}}