/* extra.css
 * Custom styling for Cisco's Chem Hub + Chem 1A site.
 * Shared across landing + course projects.
 */

body {
  /* You can tweak global typography here later if you want */
}

/* =====================================
   Chem 1A Zensical callout vocabulary
   ===================================== */

:root {
  --chem-callout-note: 79 70 229;
  --chem-callout-abstract: 2 132 199;
  --chem-callout-info: 8 145 178;
  --chem-callout-tip: 5 150 105;
  --chem-callout-success: 22 163 74;
  --chem-callout-question: 101 163 13;
  --chem-callout-warning: 217 119 6;
  --chem-callout-danger: 220 38 38;
  --chem-callout-example: 147 51 234;
  --chem-callout-quote: 100 116 139;
  --chem-callout-reading: 3 105 161;
  --chem-callout-resource: 37 99 235;
  --chem-callout-formula: 124 58 237;
  --chem-callout-flow: 234 88 12;
  --chem-callout-practice: 13 148 136;
  --chem-callout-problem: 190 24 93;

  --md-admonition-icon--reading: url('data:image/svg+xml;charset=utf-8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" viewBox="0 0 24 24"><path d="M12 7v14"/><path d="M3 18a1 1 0 0 1-1-1V4a1 1 0 0 1 1-1h5a4 4 0 0 1 4 4 4 4 0 0 1 4-4h5a1 1 0 0 1 1 1v13a1 1 0 0 1-1 1h-6a3 3 0 0 0-3 3 3 3 0 0 0-3-3z"/></svg>');
  --md-admonition-icon--resource: url('data:image/svg+xml;charset=utf-8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" viewBox="0 0 24 24"><path d="M15 3h6v6"/><path d="M10 14 21 3"/><path d="M18 13v6a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h6"/></svg>');
  --md-admonition-icon--formula: url('data:image/svg+xml;charset=utf-8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" viewBox="0 0 24 24"><rect width="16" height="20" x="4" y="2" rx="2"/><line x1="8" x2="16" y1="6" y2="6"/><line x1="16" x2="16" y1="14" y2="18"/><path d="M16 10h.01"/><path d="M12 10h.01"/><path d="M8 10h.01"/><path d="M12 14h.01"/><path d="M8 14h.01"/><path d="M12 18h.01"/><path d="M8 18h.01"/></svg>');
  --md-admonition-icon--flow: url('data:image/svg+xml;charset=utf-8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" viewBox="0 0 24 24"><circle cx="6" cy="19" r="3"/><circle cx="18" cy="5" r="3"/><path d="M9 19h8.5a3.5 3.5 0 0 0 0-7h-11a3.5 3.5 0 0 1 0-7H15"/></svg>');
  --md-admonition-icon--practice: url('data:image/svg+xml;charset=utf-8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" viewBox="0 0 24 24"><path d="M12 20h9"/><path d="M16.5 3.5a2.12 2.12 0 0 1 3 3L7 19l-4 1 1-4Z"/></svg>');
  --md-admonition-icon--problem: url('data:image/svg+xml;charset=utf-8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" viewBox="0 0 24 24"><rect width="16" height="18" x="4" y="3" rx="2"/><path d="M8 7h8"/><path d="M8 11h8"/><path d="M8 15h5"/><path d="m15 18 2 2 4-4"/></svg>');
}

body[data-md-color-scheme="slate"] {
  --chem-callout-note: 129 140 248;
  --chem-callout-abstract: 56 189 248;
  --chem-callout-info: 34 211 238;
  --chem-callout-tip: 52 211 153;
  --chem-callout-success: 74 222 128;
  --chem-callout-question: 163 230 53;
  --chem-callout-warning: 251 191 36;
  --chem-callout-danger: 248 113 113;
  --chem-callout-example: 196 181 253;
  --chem-callout-quote: 148 163 184;
  --chem-callout-reading: 125 211 252;
  --chem-callout-resource: 96 165 250;
  --chem-callout-formula: 196 181 253;
  --chem-callout-flow: 251 146 60;
  --chem-callout-practice: 94 234 212;
  --chem-callout-problem: 244 114 182;
}

.md-typeset .admonition.reading,
.md-typeset details.reading {
  background-color: rgb(var(--chem-callout-reading) / 0.055);
  color: rgb(var(--chem-callout-reading));
}

.md-typeset .admonition.resource,
.md-typeset details.resource {
  background-color: rgb(var(--chem-callout-resource) / 0.055);
  color: rgb(var(--chem-callout-resource));
}

.md-typeset .admonition.formula,
.md-typeset details.formula {
  background-color: rgb(var(--chem-callout-formula) / 0.055);
  color: rgb(var(--chem-callout-formula));
}

.md-typeset .admonition.flow,
.md-typeset details.flow {
  background-color: rgb(var(--chem-callout-flow) / 0.055);
  color: rgb(var(--chem-callout-flow));
}

.md-typeset .admonition.practice,
.md-typeset details.practice {
  background-color: rgb(var(--chem-callout-practice) / 0.055);
  color: rgb(var(--chem-callout-practice));
}

.md-typeset .admonition.problem,
.md-typeset details.problem {
  background-color: rgb(var(--chem-callout-problem) / 0.055);
  color: rgb(var(--chem-callout-problem));
}

.md-typeset .admonition.reading > *,
.md-typeset details.reading > *,
.md-typeset .admonition.resource > *,
.md-typeset details.resource > *,
.md-typeset .admonition.formula > *,
.md-typeset details.formula > *,
.md-typeset .admonition.flow > *,
.md-typeset details.flow > *,
.md-typeset .admonition.practice > *,
.md-typeset details.practice > *,
.md-typeset .admonition.problem > *,
.md-typeset details.problem > * {
  color: var(--md-admonition-fg-color);
}

.md-typeset .reading > .admonition-title::before,
.md-typeset .reading > summary::before {
  background-color: rgb(var(--chem-callout-reading));
  -webkit-mask-image: var(--md-admonition-icon--reading);
  mask-image: var(--md-admonition-icon--reading);
}

.md-typeset .resource > .admonition-title::before,
.md-typeset .resource > summary::before {
  background-color: rgb(var(--chem-callout-resource));
  -webkit-mask-image: var(--md-admonition-icon--resource);
  mask-image: var(--md-admonition-icon--resource);
}

.md-typeset .formula > .admonition-title::before,
.md-typeset .formula > summary::before {
  background-color: rgb(var(--chem-callout-formula));
  -webkit-mask-image: var(--md-admonition-icon--formula);
  mask-image: var(--md-admonition-icon--formula);
}

.md-typeset .flow > .admonition-title::before,
.md-typeset .flow > summary::before {
  background-color: rgb(var(--chem-callout-flow));
  -webkit-mask-image: var(--md-admonition-icon--flow);
  mask-image: var(--md-admonition-icon--flow);
}

.md-typeset .practice > .admonition-title::before,
.md-typeset .practice > summary::before {
  background-color: rgb(var(--chem-callout-practice));
  -webkit-mask-image: var(--md-admonition-icon--practice);
  mask-image: var(--md-admonition-icon--practice);
}

.md-typeset .problem > .admonition-title::before,
.md-typeset .problem > summary::before {
  background-color: rgb(var(--chem-callout-problem));
  -webkit-mask-image: var(--md-admonition-icon--problem);
  mask-image: var(--md-admonition-icon--problem);
}

.md-typeset .reading > .admonition-title::after,
.md-typeset .reading > summary::after {
  color: rgb(var(--chem-callout-reading));
}

.md-typeset .resource > .admonition-title::after,
.md-typeset .resource > summary::after {
  color: rgb(var(--chem-callout-resource));
}

.md-typeset .formula > .admonition-title::after,
.md-typeset .formula > summary::after {
  color: rgb(var(--chem-callout-formula));
}

.md-typeset .flow > .admonition-title::after,
.md-typeset .flow > summary::after {
  color: rgb(var(--chem-callout-flow));
}

.md-typeset .practice > .admonition-title::after,
.md-typeset .practice > summary::after {
  color: rgb(var(--chem-callout-practice));
}

.md-typeset .problem > .admonition-title::after,
.md-typeset .problem > summary::after {
  color: rgb(var(--chem-callout-problem));
}

/* Broaden the visual palette across Material's built-in callouts. */
.md-typeset .admonition,
.md-typeset details {
  --chem-admonition-accent: var(--chem-callout-info);
  border: 1px solid color-mix(in oklab, CanvasText 14%, Canvas 86%);
  box-shadow: 0 1px 2px color-mix(in oklab, CanvasText 5%, transparent);
}

.md-typeset .admonition > .admonition-title,
.md-typeset details > summary {
  background-color: transparent;
}

.md-typeset .admonition > .admonition-title::before,
.md-typeset details > summary::before {
  background-color: rgb(var(--chem-admonition-accent));
}

.md-typeset .admonition > .admonition-title::after,
.md-typeset details > summary::after {
  color: rgb(var(--chem-admonition-accent));
}

.md-typeset .admonition.note,
.md-typeset details.note {
  --chem-admonition-accent: var(--chem-callout-note);
  background-color: rgb(var(--chem-callout-note) / 0.045);
}

.md-typeset .admonition.abstract,
.md-typeset details.abstract,
.md-typeset .admonition.summary,
.md-typeset details.summary,
.md-typeset .admonition.tldr,
.md-typeset details.tldr {
  --chem-admonition-accent: var(--chem-callout-abstract);
  background-color: rgb(var(--chem-callout-abstract) / 0.045);
}

.md-typeset .admonition.info,
.md-typeset details.info {
  --chem-admonition-accent: var(--chem-callout-info);
  background-color: rgb(var(--chem-callout-info) / 0.045);
}

.md-typeset .admonition.tip,
.md-typeset details.tip,
.md-typeset .admonition.hint,
.md-typeset details.hint,
.md-typeset .admonition.important,
.md-typeset details.important {
  --chem-admonition-accent: var(--chem-callout-tip);
  background-color: rgb(var(--chem-callout-tip) / 0.045);
}

.md-typeset .admonition.success,
.md-typeset details.success,
.md-typeset .admonition.check,
.md-typeset details.check,
.md-typeset .admonition.done,
.md-typeset details.done {
  --chem-admonition-accent: var(--chem-callout-success);
  background-color: rgb(var(--chem-callout-success) / 0.045);
}

.md-typeset .admonition.question,
.md-typeset details.question,
.md-typeset .admonition.help,
.md-typeset details.help,
.md-typeset .admonition.faq,
.md-typeset details.faq {
  --chem-admonition-accent: var(--chem-callout-question);
  background-color: rgb(var(--chem-callout-question) / 0.045);
}

.md-typeset .admonition.warning,
.md-typeset details.warning,
.md-typeset .admonition.caution,
.md-typeset details.caution,
.md-typeset .admonition.attention,
.md-typeset details.attention {
  --chem-admonition-accent: var(--chem-callout-warning);
  background-color: rgb(var(--chem-callout-warning) / 0.045);
}

.md-typeset .admonition.danger,
.md-typeset details.danger,
.md-typeset .admonition.failure,
.md-typeset details.failure,
.md-typeset .admonition.fail,
.md-typeset details.fail,
.md-typeset .admonition.missing,
.md-typeset details.missing,
.md-typeset .admonition.bug,
.md-typeset details.bug {
  --chem-admonition-accent: var(--chem-callout-danger);
  background-color: rgb(var(--chem-callout-danger) / 0.045);
}

.md-typeset .admonition.example,
.md-typeset details.example {
  --chem-admonition-accent: var(--chem-callout-example);
  background-color: rgb(var(--chem-callout-example) / 0.045);
}

.md-typeset .admonition.quote,
.md-typeset details.quote,
.md-typeset .admonition.cite,
.md-typeset details.cite {
  --chem-admonition-accent: var(--chem-callout-quote);
  background-color: rgb(var(--chem-callout-quote) / 0.045);
}

.md-typeset .admonition.reading,
.md-typeset details.reading,
.md-typeset .admonition.resource,
.md-typeset details.resource,
.md-typeset .admonition.formula,
.md-typeset details.formula,
.md-typeset .admonition.flow,
.md-typeset details.flow,
.md-typeset .admonition.practice,
.md-typeset details.practice,
.md-typeset .admonition.problem,
.md-typeset details.problem {
  color: var(--md-admonition-fg-color);
}

.md-typeset .admonition.reading,
.md-typeset details.reading {
  --chem-admonition-accent: var(--chem-callout-reading);
}

.md-typeset .admonition.resource,
.md-typeset details.resource {
  --chem-admonition-accent: var(--chem-callout-resource);
}

.md-typeset .admonition.formula,
.md-typeset details.formula {
  --chem-admonition-accent: var(--chem-callout-formula);
}

.md-typeset .admonition.flow,
.md-typeset details.flow {
  --chem-admonition-accent: var(--chem-callout-flow);
}

.md-typeset .admonition.practice,
.md-typeset details.practice {
  --chem-admonition-accent: var(--chem-callout-practice);
}

.md-typeset .admonition.problem,
.md-typeset details.problem {
  --chem-admonition-accent: var(--chem-callout-problem);
}

/* =========================
   Landing page hero layout
   ========================= */

.landing-hero {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 3fr);
  align-items: center;
  gap: 3rem;
  margin-top: 2rem;
}

@media (max-width: 900px) {
  .landing-hero {
    grid-template-columns: minmax(0, 1fr);
    text-align: center;
  }
}

.landing-hero__text {
  max-width: 32rem;
  margin-inline: auto;
}

.landing-kicker {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.8rem;
  opacity: 0.7;
  margin-bottom: 0.3rem;
}

.landing-title {
  font-size: clamp(2.4rem, 3.2vw, 3.4rem);
  margin: 0 0 0.5rem 0;
}

.landing-tagline {
  font-size: 1.05rem;
  opacity: 0.9;
}

.landing-hero__buttons {
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: flex-start;
}

@media (max-width: 900px) {
  .landing-hero__buttons {
    justify-content: center;
  }
}

.btn-primary,
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.4rem;
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid color-mix(in oklab, CanvasText 20%, Canvas 80%);
}

.btn-primary {
  background: linear-gradient(
    135deg,
    color-mix(in oklab, CanvasText 85%, Canvas 15%),
    color-mix(in oklab, CanvasText 65%, Canvas 35%)
  );
  color: Canvas;
  border: none;
}

.btn-ghost {
  background: transparent;
}

/* ==========================================
   Chem 1A thumbprint: morphing orbital cloud
   ========================================== */

.orbital-density {
  --orbital-neutral-rgb: 76 88 110;
  --orbital-positive-rgb: 15 118 110;
  --orbital-negative-rgb: 180 83 9;
  --orbital-nucleus-rgb: 34 39 50;
  --orbital-glow-rgb: 76 88 110;
  --orbital-glow-alpha-start: 0.11;
  --orbital-glow-alpha-mid: 0.04;
  --orbital-label-accent-rgb: 15 118 110;
  align-items: center;
  aspect-ratio: 1 / 1;
  contain: layout paint style;
  display: grid;
  isolation: isolate;
  justify-items: center;
  margin-inline: auto;
  max-width: 430px;
  position: relative;
  width: min(430px, 100%);
}

.orbital-density::before {
  animation: orbital-density-ambient 12s ease-in-out infinite;
  background:
    radial-gradient(circle at 50% 48%, rgb(var(--orbital-positive-rgb) / 0.2), transparent 36%),
    radial-gradient(circle at 64% 35%, rgb(var(--orbital-negative-rgb) / 0.16), transparent 34%),
    radial-gradient(circle at 34% 68%, rgb(var(--orbital-neutral-rgb) / 0.12), transparent 36%);
  border-radius: 50%;
  content: "";
  inset: 3%;
  opacity: 0.72;
  position: absolute;
  z-index: -1;
}

body[data-md-color-scheme="slate"] .orbital-density {
  --orbital-neutral-rgb: 203 213 225;
  --orbital-positive-rgb: 45 212 191;
  --orbital-negative-rgb: 251 146 60;
  --orbital-nucleus-rgb: 248 250 252;
  --orbital-glow-rgb: 203 213 225;
  --orbital-glow-alpha-start: 0.16;
  --orbital-glow-alpha-mid: 0.07;
  --orbital-label-accent-rgb: 45 212 191;
}

.orbital-density__canvas {
  display: block;
  grid-area: 1 / 1;
  height: 100%;
  pointer-events: none;
  transform: translateZ(0);
  width: 100%;
}

.orbital-density__labels {
  bottom: 9%;
  display: inline-flex;
  gap: 0.42rem;
  grid-area: 1 / 1;
  justify-self: center;
  position: absolute;
}

.orbital-density__label {
  align-items: center;
  background: color-mix(in oklab, Canvas 82%, CanvasText 8%);
  border: 1px solid color-mix(in oklab, CanvasText 16%, Canvas 84%);
  border-radius: 999px;
  color: color-mix(in oklab, CanvasText 78%, Canvas 22%);
  display: inline-flex;
  font-size: 0.72rem;
  font-weight: 700;
  height: 1.45rem;
  justify-content: center;
  line-height: 1;
  text-transform: uppercase;
  transition:
    background-color 180ms ease,
    border-color 180ms ease,
    color 180ms ease,
    transform 180ms ease;
  width: 1.45rem;
}

.orbital-density[data-orbital-active="s"] .orbital-density__label--s,
.orbital-density[data-orbital-active="p"] .orbital-density__label--p,
.orbital-density[data-orbital-active="d"] .orbital-density__label--d,
.orbital-density[data-orbital-active="f"] .orbital-density__label--f {
  background: color-mix(in oklab, rgb(var(--orbital-label-accent-rgb)) 18%, Canvas 82%);
  border-color: color-mix(in oklab, rgb(var(--orbital-label-accent-rgb)) 52%, Canvas 48%);
  color: color-mix(in oklab, CanvasText 90%, Canvas 10%);
  transform: translateY(-2px);
}

@keyframes orbital-density-ambient {
  0%, 100% {
    opacity: 0.58;
    transform: scale(0.98);
  }
  50% {
    opacity: 0.84;
    transform: scale(1.04);
  }
}

@media (prefers-reduced-motion: reduce) {
  .orbital-density::before {
    animation: none !important;
    opacity: 0.68;
    transform: none !important;
  }

  .orbital-density__label {
    transition: none;
  }
}

/* Small screen: let the cloud breathe below the text */
@media (max-width: 900px) {
  .orbital-density {
    margin-top: 1.5rem;
  }
}

/* =====================================
   Chem 1A code-based instructional figures
   ===================================== */

.chem-figure {
  --chem-blue-rgb: 37 99 235;
  --chem-cyan-rgb: 8 145 178;
  --chem-green-rgb: 22 163 74;
  --chem-amber-rgb: 217 119 6;
  --chem-red-rgb: 220 38 38;
  --chem-violet-rgb: 109 40 217;
  background:
    linear-gradient(180deg, color-mix(in oklab, Canvas 94%, CanvasText 6%), transparent 62%),
    color-mix(in oklab, Canvas 96%, CanvasText 4%);
  border: 1px solid color-mix(in oklab, CanvasText 18%, Canvas 82%);
  border-radius: 8px;
  box-shadow: 0 14px 30px color-mix(in oklab, CanvasText 9%, transparent);
  margin: 1.5rem 0;
  overflow: hidden;
  padding: 1rem;
}

body[data-md-color-scheme="slate"] .chem-figure {
  --chem-blue-rgb: 96 165 250;
  --chem-cyan-rgb: 34 211 238;
  --chem-green-rgb: 74 222 128;
  --chem-amber-rgb: 251 191 36;
  --chem-red-rgb: 248 113 113;
  --chem-violet-rgb: 167 139 250;
}

.chem-figure figcaption {
  color: color-mix(in oklab, CanvasText 76%, Canvas 24%);
  font-size: 0.82rem;
  line-height: 1.45;
  margin-top: 0.75rem;
}

.chem-figure__grid {
  display: grid;
  gap: 0.85rem;
}

.chem-figure__tag {
  color: color-mix(in oklab, CanvasText 62%, Canvas 38%);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.slo-badge {
  background: color-mix(in oklab, Canvas 92%, CanvasText 8%);
  border: 1px solid color-mix(in oklab, CanvasText 24%, Canvas 76%);
  border-radius: 999px;
  color: color-mix(in oklab, CanvasText 82%, Canvas 18%);
  display: inline-block;
  font-size: 0.76em;
  font-weight: 700;
  line-height: 1;
  margin-left: 0.45rem;
  padding: 0.2rem 0.48rem;
  white-space: nowrap;
}

.week-bridge__grid {
  align-items: center;
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.week-bridge__node {
  align-content: center;
  background: color-mix(in oklab, Canvas 84%, CanvasText 7%);
  border: 1px solid color-mix(in oklab, CanvasText 18%, Canvas 82%);
  border-radius: 8px;
  display: grid;
  gap: 0.35rem;
  min-height: 7rem;
  padding: 0.85rem;
  position: relative;
}

.week-bridge__node::after {
  color: color-mix(in oklab, CanvasText 46%, Canvas 54%);
  content: "→";
  font-size: 1.35rem;
  position: absolute;
  right: -1rem;
  top: 50%;
  transform: translateY(-50%);
}

.week-bridge__node:last-child::after {
  content: "";
}

.week-bridge__icon {
  align-items: center;
  display: flex;
  gap: 0.34rem;
  min-height: 2.4rem;
}

.week-bridge__dot,
.sample-dot,
.atom-dot {
  border-radius: 50%;
  display: inline-block;
}

.week-bridge__dot {
  background: rgb(var(--chem-blue-rgb));
  box-shadow:
    1.1rem 0.55rem 0 rgb(var(--chem-cyan-rgb)),
    2.2rem 0.05rem 0 rgb(var(--chem-amber-rgb)),
    3.25rem 0.7rem 0 rgb(var(--chem-green-rgb));
  height: 0.7rem;
  width: 0.7rem;
}

.week-bridge__measure {
  background:
    linear-gradient(90deg, color-mix(in oklab, CanvasText 44%, Canvas 56%) 1px, transparent 1px) 0 0 / 0.75rem 100%,
    linear-gradient(180deg, rgb(var(--chem-cyan-rgb) / 0.28), rgb(var(--chem-cyan-rgb) / 0.08));
  border: 2px solid color-mix(in oklab, CanvasText 38%, Canvas 62%);
  border-radius: 0 0 0.35rem 0.35rem;
  height: 2.4rem;
  width: 4.4rem;
}

.week-bridge__symbol {
  color: rgb(var(--chem-violet-rgb));
  font-size: 1.4rem;
  font-weight: 800;
}

.particle-sample__box {
  background:
    radial-gradient(circle at 22% 22%, rgb(var(--chem-blue-rgb) / 0.12), transparent 34%),
    radial-gradient(circle at 78% 70%, rgb(var(--chem-cyan-rgb) / 0.12), transparent 34%),
    color-mix(in oklab, Canvas 90%, CanvasText 5%);
  border: 1px solid color-mix(in oklab, CanvasText 18%, Canvas 82%);
  border-radius: 8px;
  display: grid;
  gap: 0.45rem;
  grid-template-columns: repeat(5, 2.3rem);
  justify-content: center;
  min-height: 11rem;
  padding: 1rem;
}

.bx2-particle {
  --ligand-fill: color-mix(in oklab, Canvas 95%, CanvasText 5%);
  --ligand-ring: color-mix(in oklab, CanvasText 32%, Canvas 68%);
  background:
    radial-gradient(circle at 40% 50%, rgb(var(--chem-blue-rgb)) 0 0.6rem, transparent 0.61rem),
    radial-gradient(circle at 40% 50%, rgb(var(--chem-blue-rgb) / 0.32) 0 0.69rem, transparent 0.7rem),
    radial-gradient(circle at 72% 31%, var(--ligand-fill) 0 0.34rem, transparent 0.35rem),
    radial-gradient(circle at 72% 31%, var(--ligand-ring) 0 0.43rem, transparent 0.44rem),
    radial-gradient(circle at 72% 69%, var(--ligand-fill) 0 0.34rem, transparent 0.35rem),
    radial-gradient(circle at 72% 69%, var(--ligand-ring) 0 0.43rem, transparent 0.44rem);
  display: block;
  height: 2.25rem;
  width: 2.55rem;
}

.measurement-figure__grid {
  align-items: end;
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(9rem, 1fr) minmax(10rem, 1fr);
}

.graduated-cylinder {
  background:
    repeating-linear-gradient(
      to bottom,
      transparent 0,
      transparent 0.66rem,
      color-mix(in oklab, CanvasText 35%, Canvas 65%) 0.69rem,
      transparent 0.72rem
    ),
    color-mix(in oklab, Canvas 90%, CanvasText 5%);
  border: 2px solid color-mix(in oklab, CanvasText 42%, Canvas 58%);
  border-top: 0;
  border-radius: 0 0 0.9rem 0.9rem;
  height: 12rem;
  margin-inline: auto;
  overflow: hidden;
  position: relative;
  width: 5.4rem;
}

.graduated-cylinder::before {
  background: rgb(var(--chem-cyan-rgb) / 0.32);
  border-top: 2px solid rgb(var(--chem-cyan-rgb) / 0.8);
  border-radius: 50% 50% 0 0;
  bottom: 4.75rem;
  content: "";
  height: 0.82rem;
  left: 0.45rem;
  position: absolute;
  right: 0.45rem;
}

.graduated-cylinder::after {
  background: linear-gradient(180deg, rgb(var(--chem-cyan-rgb) / 0.25), rgb(var(--chem-cyan-rgb) / 0.48));
  bottom: 0;
  content: "";
  height: 5rem;
  left: 0;
  position: absolute;
  right: 0;
}

.instrument-label,
.balance-readout {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.instrument-label {
  color: color-mix(in oklab, CanvasText 72%, Canvas 28%);
  display: block;
  font-size: 0.8rem;
  margin-top: 0.55rem;
  text-align: center;
}

.balance-card {
  align-content: center;
  background: color-mix(in oklab, Canvas 88%, CanvasText 7%);
  border: 1px solid color-mix(in oklab, CanvasText 20%, Canvas 80%);
  border-radius: 8px;
  display: grid;
  justify-items: center;
  min-height: 9rem;
  padding: 1rem;
}

.balance-pan {
  background:
    radial-gradient(circle, rgb(var(--chem-amber-rgb) / 0.3), transparent 58%),
    color-mix(in oklab, CanvasText 16%, Canvas 84%);
  border-radius: 50%;
  height: 2.8rem;
  width: 7rem;
}

.balance-readout {
  background: color-mix(in oklab, CanvasText 92%, Canvas 8%);
  border-radius: 6px;
  color: Canvas;
  font-size: 1.05rem;
  font-weight: 700;
  margin-top: 0.8rem;
  padding: 0.45rem 0.8rem;
}

.scale-ladder__row {
  align-items: center;
  display: grid;
  gap: 0.7rem;
  grid-template-columns: 6.2rem 1fr 7.5rem;
  padding: 0.45rem 0;
}

.scale-ladder__track {
  background: color-mix(in oklab, CanvasText 16%, Canvas 84%);
  border-radius: 999px;
  height: 0.5rem;
  overflow: hidden;
  position: relative;
}

.scale-ladder__track::before {
  background: linear-gradient(90deg, rgb(var(--chem-blue-rgb)), rgb(var(--chem-amber-rgb)));
  border-radius: inherit;
  content: "";
  inset: 0 var(--ladder-rest, 50%) 0 0;
  position: absolute;
}

.scale-ladder__exponent {
  color: rgb(var(--chem-violet-rgb));
  font-weight: 800;
}

/* =====================================
   Chem 1A native classification maps
   ===================================== */

.matter-classification {
  --matter-pure-rgb: 37 99 235;
  --matter-mixture-rgb: 217 119 6;
  --matter-element-rgb: 22 163 74;
  --matter-compound-rgb: 124 58 237;
  --matter-homogeneous-rgb: 8 145 178;
  --matter-heterogeneous-rgb: 220 38 38;
  display: grid;
  gap: 0.9rem;
  margin: 1rem 0;
}

body[data-md-color-scheme="slate"] .matter-classification {
  --matter-pure-rgb: 96 165 250;
  --matter-mixture-rgb: 251 146 60;
  --matter-element-rgb: 74 222 128;
  --matter-compound-rgb: 196 181 253;
  --matter-homogeneous-rgb: 34 211 238;
  --matter-heterogeneous-rgb: 248 113 113;
}

.matter-classification__node {
  --matter-accent-rgb: 71 85 105;
  background: rgb(var(--matter-accent-rgb) / 0.04);
  border: 1px solid color-mix(in oklab, CanvasText 14%, Canvas 86%);
  border-radius: 8px;
  box-shadow: 0 1px 2px color-mix(in oklab, CanvasText 5%, transparent);
  display: grid;
  gap: 0.22rem;
  min-height: 5.2rem;
  padding: 0.75rem 0.85rem;
}

.matter-classification__root {
  justify-items: center;
  text-align: center;
}

.matter-classification__branches,
.matter-classification__children {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.matter-classification__branch {
  display: grid;
  gap: 0.75rem;
}

.matter-classification__branch--pure > .matter-classification__node {
  --matter-accent-rgb: var(--matter-pure-rgb);
}

.matter-classification__branch--mixture > .matter-classification__node {
  --matter-accent-rgb: var(--matter-mixture-rgb);
}

.matter-classification__node--element {
  --matter-accent-rgb: var(--matter-element-rgb);
}

.matter-classification__node--compound {
  --matter-accent-rgb: var(--matter-compound-rgb);
}

.matter-classification__node--homogeneous {
  --matter-accent-rgb: var(--matter-homogeneous-rgb);
}

.matter-classification__node--heterogeneous {
  --matter-accent-rgb: var(--matter-heterogeneous-rgb);
}

.matter-classification__node strong {
  color: rgb(var(--matter-accent-rgb));
  font-size: 0.98rem;
  line-height: 1.2;
}

.matter-classification__node span {
  color: color-mix(in oklab, CanvasText 72%, Canvas 28%);
  font-size: 0.84rem;
  line-height: 1.35;
}

@media (max-width: 760px) {
  .matter-classification__branches,
  .matter-classification__children {
    grid-template-columns: 1fr;
  }
}

/* =====================================
   Chem 1A native procedure flowcharts
   ===================================== */

.chem-flow {
  --chem-blue-rgb: 37 99 235;
  --chem-green-rgb: 22 163 74;
  --chem-amber-rgb: 217 119 6;
  --chem-flow-line: color-mix(in oklab, CanvasText 58%, Canvas 42%);
  --chem-flow-border: color-mix(in oklab, CanvasText 24%, Canvas 76%);
  --chem-flow-step-fill: color-mix(in oklab, Canvas 95%, CanvasText 5%);
  --chem-flow-terminal-fill: color-mix(in oklab, rgb(var(--chem-green-rgb)) 12%, Canvas 88%);
  --chem-flow-decision-fill: color-mix(in oklab, rgb(var(--chem-amber-rgb)) 14%, Canvas 86%);
  --chem-flow-note-fill: color-mix(in oklab, rgb(var(--chem-blue-rgb)) 10%, Canvas 90%);
  margin: 1.5rem 0;
}

body[data-md-color-scheme="slate"] .chem-flow {
  --chem-blue-rgb: 96 165 250;
  --chem-green-rgb: 74 222 128;
  --chem-amber-rgb: 251 191 36;
}

.chem-flow figcaption {
  color: color-mix(in oklab, CanvasText 74%, Canvas 26%);
  font-size: 0.86rem;
  line-height: 1.45;
  margin-top: 0.75rem;
}

.chem-flow__steps {
  counter-reset: chem-flow-step;
  display: grid;
  gap: 0.85rem 1rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 12.5rem), 1fr));
  list-style: none;
  margin: 0;
  padding: 0;
}

.chem-flow__step {
  --chem-flow-fill: var(--chem-flow-step-fill);
  background: var(--chem-flow-fill);
  border: 1px solid var(--chem-flow-border);
  border-radius: 8px;
  box-shadow: 0 10px 20px color-mix(in oklab, CanvasText 7%, transparent);
  counter-increment: chem-flow-step;
  display: grid;
  gap: 0.38rem;
  grid-template-rows: auto auto 1fr;
  min-height: 8.25rem;
  padding: 0.82rem 0.88rem;
  position: relative;
}

.chem-flow__step:not(:last-child)::after {
  align-items: center;
  background: Canvas;
  border: 1px solid color-mix(in oklab, var(--chem-flow-line) 58%, Canvas 42%);
  border-radius: 999px;
  color: var(--chem-flow-line);
  content: "→";
  display: inline-flex;
  font-size: 0.85rem;
  font-weight: 800;
  height: 1.45rem;
  justify-content: center;
  line-height: 1;
  position: absolute;
  right: -0.86rem;
  top: 50%;
  transform: translateY(-50%);
  width: 1.45rem;
  z-index: 1;
}

.chem-flow__step--terminal {
  --chem-flow-fill: var(--chem-flow-terminal-fill);
  border-radius: 999px 8px 8px 999px;
}

.chem-flow__step--decision {
  --chem-flow-fill: var(--chem-flow-decision-fill);
}

.chem-flow__step--note {
  --chem-flow-fill: var(--chem-flow-note-fill);
  border-style: dashed;
}

.chem-flow__kicker {
  align-items: center;
  color: color-mix(in oklab, CanvasText 64%, Canvas 36%);
  display: inline-flex;
  font-size: 0.68rem;
  font-weight: 800;
  gap: 0.38rem;
  letter-spacing: 0.08em;
  line-height: 1;
  text-transform: uppercase;
}

.chem-flow__kicker::before {
  align-items: center;
  background: color-mix(in oklab, CanvasText 82%, Canvas 18%);
  border-radius: 999px;
  color: Canvas;
  content: counter(chem-flow-step);
  display: inline-flex;
  font-size: 0.66rem;
  height: 1.28rem;
  justify-content: center;
  letter-spacing: 0;
  width: 1.28rem;
}

.chem-flow__step strong {
  color: color-mix(in oklab, CanvasText 90%, Canvas 10%);
  display: block;
  font-size: 0.98rem;
  line-height: 1.22;
}

.chem-flow__step span:last-child {
  color: color-mix(in oklab, CanvasText 76%, Canvas 24%);
  font-size: 0.86rem;
  line-height: 1.38;
}

@media (max-width: 760px) {
  .week-bridge__grid,
  .measurement-figure__grid {
    grid-template-columns: 1fr;
  }

  .week-bridge__node::after {
    bottom: -1.1rem;
    right: 50%;
    top: auto;
    transform: translateX(50%) rotate(90deg);
  }

  .particle-sample__box {
    grid-template-columns: repeat(4, 2.3rem);
  }

  .scale-ladder__row {
    grid-template-columns: 4.8rem 1fr;
  }

  .scale-ladder__row span:last-child {
    grid-column: 2;
  }

  .chem-flow__steps {
    grid-template-columns: 1fr;
  }

  .chem-flow__step:not(:last-child)::after {
    bottom: -0.86rem;
    right: 50%;
    top: auto;
    transform: translateX(50%) rotate(90deg);
  }
}

/* ==============================
   1D particle-in-a-box strip
   (Landing hero particle waves)
   ============================== */

.pib-strip {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 0.75rem;
  perspective: 900px;
}

@media (max-width: 900px) {
  .pib-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 600px) {
  .pib-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.pib-state {
  padding: 0.4rem 0.5rem 0.6rem 0.5rem;
  border-radius: 8px;
  border: 1px solid color-mix(in oklab, CanvasText 25%, Canvas 75%);
  background:
    linear-gradient(180deg, color-mix(in oklab, Canvas 98%, CanvasText 2%), transparent 52%),
    color-mix(in oklab, Canvas 88%, CanvasText 4%);
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  overflow: hidden;
  position: relative;
  transition:
    border-color 160ms ease,
    box-shadow 160ms ease,
    transform 160ms ease;
}

.pib-state:hover {
  border-color: color-mix(in oklab, CanvasText 42%, Canvas 58%);
  box-shadow: 0 12px 24px color-mix(in oklab, CanvasText 12%, transparent);
  transform: translateY(-2px) rotateX(2deg);
}

.pib-state-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  opacity: 0.75;
}

/* SVG container */
.pib-wave {
  width: 100%;
  height: auto;
  overflow: visible;
}

/* Baseline and walls */
.pib-axis {
  stroke: color-mix(in oklab, CanvasText 45%, Canvas 55%);
  stroke-width: 1.2;
}

.pib-wall {
  stroke: color-mix(in oklab, CanvasText 30%, Canvas 70%);
  stroke-width: 1.2;
  stroke-linecap: round;
}

/* Wavefunctions: thin line, no fill, gentle breathing */
.pib-psi {
  fill: none;
  stroke: color-mix(in oklab, CanvasText 80%, Canvas 20%);
  stroke-width: 1.45;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 7 5;
  filter: drop-shadow(0 0 5px color-mix(in oklab, CanvasText 24%, transparent));

  transform-origin: 50% 50%;
  animation:
    pib-oscillate var(--pib-duration, 2.4s) ease-in-out infinite,
    pib-trace 7s linear infinite;
}

/* Slightly different timings per n so they drift out of phase */
.pib-psi--n1 { --pib-duration: 2.0s; animation-delay: 0s, 0s; }
.pib-psi--n2 { --pib-duration: 2.2s; animation-delay: -0.2s, -1.1s; }
.pib-psi--n3 { --pib-duration: 2.4s; animation-delay: -0.4s, -2.0s; }
.pib-psi--n4 { --pib-duration: 2.6s; animation-delay: -0.6s, -2.7s; }
.pib-psi--n5 { --pib-duration: 2.8s; animation-delay: -0.8s, -3.4s; }

@keyframes pib-oscillate {
  0% {
    transform: scaleY(1);   /* normal phase */
    opacity: 0.95;
  }
  25% {
    transform: scaleY(0.3);   /* near zero amplitude */
    opacity: 0.4;
  }
  50% {
    transform: scaleY(-1);    /* fully inverted */
    opacity: 0.95;
  }
  75% {
    transform: scaleY(-0.3);  /* shrinking again */
    opacity: 0.4;
  }
  100% {
    transform: scaleY(1);     /* back to original */
    opacity: 0.95;
  }
}

@keyframes pib-trace {
  0% {
    stroke-dashoffset: 0;
  }
  100% {
    stroke-dashoffset: -36;
  }
}

@media (prefers-reduced-motion: reduce) {
  .pib-state {
    transition: none;
  }

  .pib-state:hover {
    box-shadow: none;
    transform: none;
  }

  .pib-psi {
    animation: none;
    opacity: 0.95;
    stroke-dashoffset: 0;
  }
}

/* ======================
   Course media embeds
   ====================== */

.chem-video {
  aspect-ratio: 16 / 9;
  margin: 1.25rem auto;
  max-width: 48rem;
  width: 100%;
}

.chem-video iframe {
  border: 0;
  border-radius: 8px;
  display: block;
  height: 100%;
  width: 100%;
}

/* ========================
   Courses page layout
   ======================== */

.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.course-card {
  padding: 1.25rem 1.35rem;
  border-radius: 12px;
  border: 1px solid color-mix(in oklab, CanvasText 18%, Canvas 82%);
  background: color-mix(in oklab, Canvas 92%, CanvasText 8%);
}

.course-card h2 {
  margin-top: 0;
  margin-bottom: 0.25rem;
}

.course-tagline {
  margin-top: 0;
  margin-bottom: 0.75rem;
  font-style: italic;
  opacity: 0.9;
}

.course-slo-note {
  font-size: 0.9rem;
  opacity: 0.8;
}

.course-link {
  margin-top: 0.9rem;
  font-weight: 600;
}

.course-chooser-buttons {
  justify-content: center;
  margin-top: 1.5rem;
}

/* ======================
   About page layout
   ====================== */

.bio-layout {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.bio-text {
  flex: 1 1 260px;
  min-width: 0;
}

.bio-aside {
  flex: 0 0 180px;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  align-items: center;
}

.bio-image {
  max-width: 160px;
  width: 100%;
  border-radius: 12px;
  border: 1px solid color-mix(in oklab, CanvasText 18%, Canvas 82%);
  background: Canvas;
}

/* Stack nicely on small screens */
@media (max-width: 700px) {
  .bio-layout {
    flex-direction: column;
    align-items: stretch;
  }

  .bio-aside {
    flex-direction: row;
    justify-content: center;
    flex-wrap: wrap;
  }

  .bio-image {
    max-width: 130px;
  }
}