:root {
  --bg: #080b13;
  --bg-2: #0e1424;
  --panel: #121a2e;
  --panel-2: #182238;
  --text: #f7f3e8;
  --muted: #b9c2d8;
  --soft: #d8def0;
  --accent: #ffd86b;
  --accent-2: #b8ff72;
  --accent-3: #7de7ff;
  --accent-4: #ff77bd;
  --danger: #ff8aa8;
  --success: #b8ff72;
  --line: rgba(255, 255, 255, 0.13);
  --line-strong: rgba(255, 255, 255, 0.24);
  --glass: rgba(255, 255, 255, 0.065);
  --glass-strong: rgba(255, 255, 255, 0.095);
  --header-bg: rgba(8, 11, 19, 0.86);
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.42);
  --shadow-soft: 0 16px 44px rgba(0, 0, 0, 0.24);
  --radius: 24px;
  --radius-small: 17px;
  --max-width: 1180px;
  --display-font: "Fraunces", Georgia, "Times New Roman", serif;
  --body-font: "DM Sans", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --body-gradient:
    radial-gradient(circle at 18% 0%, rgba(125, 231, 255, 0.16), transparent 35%),
    radial-gradient(circle at 88% 10%, rgba(255, 119, 189, 0.14), transparent 34%),
    linear-gradient(135deg, var(--bg), #0b1020 45%, #070a12);
}

html[data-theme="ivory"] {
  --bg: #f6f1e7;
  --bg-2: #eee5d4;
  --panel: #fffdf8;
  --panel-2: #f2eadc;
  --text: #1d2533;
  --muted: #5b6472;
  --soft: #303b4c;
  --accent: #9b5c13;
  --accent-2: #2e7d56;
  --accent-3: #1f6c8c;
  --accent-4: #9d3c6e;
  --danger: #a22c45;
  --success: #1f754f;
  --line: rgba(25, 35, 51, 0.15);
  --line-strong: rgba(25, 35, 51, 0.28);
  --glass: rgba(255, 255, 255, 0.7);
  --glass-strong: rgba(255, 255, 255, 0.92);
  --header-bg: rgba(246, 241, 231, 0.91);
  --shadow: 0 24px 60px rgba(80, 63, 35, 0.18);
  --shadow-soft: 0 14px 34px rgba(80, 63, 35, 0.12);
  --body-gradient:
    radial-gradient(circle at 12% 0%, rgba(46, 125, 86, 0.11), transparent 36%),
    radial-gradient(circle at 92% 10%, rgba(155, 92, 19, 0.11), transparent 35%),
    linear-gradient(135deg, #f9f5ed, #f0e7d7 52%, #faf7f0);
  color-scheme: light;
}

html[data-theme="ocean"] {
  --bg: #06131e;
  --bg-2: #0a2233;
  --panel: #0e2b40;
  --panel-2: #123a55;
  --text: #eefaff;
  --muted: #b3d4e4;
  --soft: #d7eef8;
  --accent: #6fe7ff;
  --accent-2: #78f0c1;
  --accent-3: #a6c8ff;
  --accent-4: #ff9dd2;
  --danger: #ff9aa8;
  --success: #78f0c1;
  --line: rgba(191, 237, 255, 0.16);
  --line-strong: rgba(191, 237, 255, 0.3);
  --header-bg: rgba(6, 19, 30, 0.88);
  --body-gradient:
    radial-gradient(circle at 20% -5%, rgba(111, 231, 255, 0.18), transparent 36%),
    radial-gradient(circle at 88% 18%, rgba(120, 240, 193, 0.13), transparent 34%),
    linear-gradient(145deg, #06131e, #0a2233 48%, #06101b);
}

html[data-theme="graphite"] {
  --bg: #111111;
  --bg-2: #1a1a1a;
  --panel: #212121;
  --panel-2: #2b2b2b;
  --text: #faf7ef;
  --muted: #c7c1b6;
  --soft: #e4ded3;
  --accent: #e7bd67;
  --accent-2: #d2e7a6;
  --accent-3: #a5d4e7;
  --accent-4: #e2a7c6;
  --line: rgba(255, 255, 255, 0.14);
  --line-strong: rgba(255, 255, 255, 0.28);
  --header-bg: rgba(17, 17, 17, 0.9);
  --body-gradient:
    radial-gradient(circle at 18% 0%, rgba(231, 189, 103, 0.12), transparent 34%),
    radial-gradient(circle at 90% 15%, rgba(165, 212, 231, 0.08), transparent 34%),
    linear-gradient(145deg, #111, #1a1a1a 48%, #0d0d0d);
}

html[data-theme="contrast"] {
  --bg: #000000;
  --bg-2: #060606;
  --panel: #0b0b0b;
  --panel-2: #151515;
  --text: #ffffff;
  --muted: #f2f2f2;
  --soft: #ffffff;
  --accent: #ffd800;
  --accent-2: #8cff00;
  --accent-3: #00e5ff;
  --accent-4: #ff70c5;
  --danger: #ff738b;
  --success: #8cff00;
  --line: rgba(255, 255, 255, 0.42);
  --line-strong: rgba(255, 255, 255, 0.72);
  --header-bg: rgba(0, 0, 0, 0.96);
  --shadow: none;
  --shadow-soft: none;
  --body-gradient: #000;
}

html[data-style="textbook"] {
  --display-font: Georgia, "Times New Roman", serif;
  --body-font: Georgia, "Times New Roman", serif;
  --radius: 9px;
  --radius-small: 6px;
}

html[data-style="minimal"] {
  --radius: 12px;
  --radius-small: 9px;
  --shadow: none;
  --shadow-soft: none;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

body {
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background: var(--body-gradient);
  color: var(--text);
  font-family: var(--body-font);
  line-height: 1.58;
  text-rendering: optimizeLegibility;
}

html[data-style="textbook"] body {
  line-height: 1.7;
}

html[data-style="minimal"] body {
  background: var(--bg);
}

button,
input,
select,
textarea {
  font: inherit;
}

button,
a,
input,
select,
summary {
  -webkit-tap-highlight-color: transparent;
}

a {
  color: inherit;
  text-decoration: none;
}

img,
svg,
canvas {
  max-width: 100%;
}

canvas {
  display: block;
}

.container {
  width: min(var(--max-width), calc(100% - 34px));
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  top: -5rem;
  left: 1rem;
  z-index: 1000;
  padding: 0.65rem 1rem;
  border-radius: 999px;
  background: var(--accent);
  color: #151006;
  font-weight: 900;
}

.skip-link:focus {
  top: 1rem;
}

:focus-visible {
  outline: 3px solid var(--accent-3);
  outline-offset: 3px;
}

.page-glow {
  position: fixed;
  z-index: -1;
  pointer-events: none;
  opacity: 0.6;
  filter: blur(4px);
}

.page-glow-one {
  bottom: 8vh;
  left: -10vw;
  width: 35vw;
  height: 35vw;
  background: radial-gradient(circle, color-mix(in srgb, var(--accent-2) 18%, transparent), transparent 62%);
}

.page-glow-two {
  top: 30vh;
  right: -8vw;
  width: 30vw;
  height: 30vw;
  background: radial-gradient(circle, color-mix(in srgb, var(--accent) 15%, transparent), transparent 65%);
}

.site-header,
.module-header {
  position: sticky;
  top: 0;
  z-index: 70;
  border-bottom: 1px solid var(--line);
  background: var(--header-bg);
  backdrop-filter: blur(18px);
}

.header-inner,
.module-header-inner,
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 15px 0;
}

.brand {
  display: flex;
  min-width: max-content;
  align-items: center;
  gap: 0.8rem;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  line-height: 1.05;
}

.brand small {
  color: var(--muted);
  font-size: 0.78rem;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  grid-template-columns: repeat(2, 1fr);
  gap: 4px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 23%, transparent), color-mix(in srgb, var(--accent-3) 18%, transparent));
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.2);
}

.brand-mark span {
  border-radius: 5px;
  background: var(--accent);
}

.brand-mark span:nth-child(2) {
  background: var(--accent-3);
}

.brand-mark span:nth-child(3) {
  grid-column: 1 / 3;
  background: var(--accent-2);
}

.main-nav {
  display: flex;
  gap: 1.25rem;
  color: var(--muted);
  font-size: 0.95rem;
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  min-height: 44px;
  padding: 0.78rem 1.12rem;
  border: 1px solid transparent;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 850;
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent) 72%, #ff8a00));
  color: #1a1304;
  box-shadow: 0 14px 35px color-mix(in srgb, var(--accent) 24%, transparent);
}

html[data-theme="ivory"] .button-primary,
html[data-theme="contrast"] .button-primary {
  color: #111;
}

.button-secondary {
  border-color: var(--line);
  background: var(--glass);
  color: var(--text);
}

.button-ghost {
  border-color: var(--line);
  background: transparent;
  color: var(--soft);
}

.button-small {
  min-height: 38px;
  padding: 0.53rem 0.86rem;
  font-size: 0.9rem;
}

.text-button,
.hint-button {
  border: 0;
  background: transparent;
  color: var(--accent);
  cursor: pointer;
  font-weight: 850;
}

.eyebrow,
.lesson-kicker,
.section-number {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 0 0 1rem;
  color: var(--accent-2);
  font-size: 0.82rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  line-height: 1.35;
  text-transform: uppercase;
}

.eyebrow > span:first-child {
  width: 30px;
  height: 2px;
  flex: 0 0 30px;
  border-radius: 999px;
  background: var(--accent-2);
}

h1,
h2,
h3,
h4 {
  margin: 0 0 0.72rem;
  font-family: var(--display-font);
  line-height: 1.06;
  text-wrap: balance;
}

h1 {
  font-size: clamp(3rem, 7vw, 6.8rem);
  letter-spacing: -0.06em;
}

h2 {
  font-size: clamp(2rem, 4vw, 4.15rem);
  letter-spacing: -0.04em;
}

h3 {
  font-size: 1.35rem;
}

p {
  margin: 0 0 1rem;
}

.hero-lede,
.section-heading > p,
.lesson-lede {
  max-width: 720px;
  color: var(--muted);
  font-size: clamp(1.04rem, 2vw, 1.23rem);
}

.hero {
  display: grid;
  min-height: calc(100vh - 74px);
  grid-template-columns: minmax(0, 1.02fr) minmax(330px, 0.85fr);
  align-items: center;
  gap: 3rem;
  padding: 70px 0 58px;
}

.hero-copy {
  min-width: 0;
}

.hero-actions,
.lesson-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin: 1.7rem 0;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.7rem;
  margin: 2rem 0 0;
}

.hero-stats div {
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--glass);
}

.hero-stats dt {
  color: var(--accent);
  font-size: 1.6rem;
  font-weight: 900;
}

.hero-stats dd {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.math-compass {
  position: relative;
  display: grid;
  min-height: 520px;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 36px;
  background: linear-gradient(150deg, var(--glass-strong), color-mix(in srgb, var(--panel) 45%, transparent));
  box-shadow: var(--shadow);
}

.compass-orbit {
  position: absolute;
  border: 1px solid var(--line);
  border-radius: 50%;
}

.orbit-one {
  width: 78%;
  height: 78%;
}

.orbit-two {
  width: 52%;
  height: 52%;
  transform: rotate(24deg);
}

.compass-center {
  z-index: 2;
  display: grid;
  width: 180px;
  height: 180px;
  place-items: center;
  border: 1px solid color-mix(in srgb, var(--accent) 42%, transparent);
  border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--accent) 28%, transparent), color-mix(in srgb, var(--panel) 94%, transparent));
  box-shadow: 0 0 60px color-mix(in srgb, var(--accent) 15%, transparent);
  text-align: center;
}

.compass-center span {
  color: var(--accent);
  font-size: 3.2rem;
  line-height: 1;
}

.compass-center small {
  color: var(--muted);
}

.compass-node {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: color-mix(in srgb, var(--panel) 92%, transparent);
  color: var(--text);
  box-shadow: var(--shadow-soft);
  cursor: pointer;
}

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

.compass-node span {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 12px;
  background: color-mix(in srgb, var(--accent) 16%, transparent);
  color: var(--accent);
  font-weight: 900;
}

.node-algebra { top: 17%; left: 8%; }
.node-analysis { top: 18%; right: 8%; }
.node-geometry { bottom: 24%; left: 6%; }
.node-probability { right: 6%; bottom: 24%; }
.node-modeling { top: 46%; left: 0; }
.node-life { top: 46%; right: 0; }

.section {
  padding: 72px 0;
}

.split-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 2rem;
  margin-bottom: 1.5rem;
}

.split-heading > p {
  max-width: 470px;
}

.path-grid,
.subject-grid,
.principle-list,
.axiom-grid,
.connection-card-grid {
  display: grid;
  gap: 1rem;
}

.path-grid {
  grid-template-columns: repeat(3, 1fr);
}

.path-card,
.subject-card,
.principle-list article,
.concept-card,
.definition-card,
.theorem-card,
.challenge-card,
.lab-shell,
.notation-note,
.concept-note,
.path-preview,
.info-box {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(145deg, var(--glass-strong), color-mix(in srgb, var(--panel) 35%, transparent));
  box-shadow: var(--shadow-soft);
}

html[data-style="minimal"] :is(.path-card, .subject-card, .principle-list article, .concept-card, .definition-card, .theorem-card, .challenge-card, .lab-shell, .notation-note, .concept-note, .path-preview, .info-box) {
  background: var(--panel);
}

.path-card {
  padding: 1.25rem;
  color: var(--text);
  text-align: left;
  cursor: pointer;
}

.path-card:hover,
.subject-card:hover {
  border-color: color-mix(in srgb, var(--accent) 55%, transparent);
  transform: translateY(-4px);
}

.path-card strong {
  display: block;
  margin: 0.35rem 0;
  font-size: 1.08rem;
}

.path-icon {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  border-radius: 16px;
  background: color-mix(in srgb, var(--accent-3) 14%, transparent);
  color: var(--accent-3);
  font-size: 1.5rem;
}

.path-label,
.subject-region {
  color: var(--accent-2);
  font-size: 0.75rem;
  font-weight: 900;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.path-sequence,
.subject-card p {
  color: var(--muted);
}

.atlas-controls {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin: 1.25rem 0;
}

.search-box {
  display: flex;
  flex: 1;
  align-items: center;
  gap: 0.75rem;
  padding: 0.7rem 1rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--glass);
}

.search-box svg {
  width: 22px;
  fill: none;
  stroke: var(--muted);
  stroke-width: 2;
}

.search-box input {
  min-width: 0;
  flex: 1;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
}

.search-box input::placeholder {
  color: color-mix(in srgb, var(--muted) 72%, transparent);
}

.search-box kbd {
  padding: 0.1rem 0.4rem;
  border: 1px solid var(--line);
  border-radius: 7px;
  color: var(--muted);
}

.category-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 0.8rem 0 1rem;
}

.category-filters button {
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--glass);
  color: var(--soft);
  cursor: pointer;
}

.category-filters button.active {
  border-color: var(--accent);
  background: var(--accent);
  color: #151002;
  font-weight: 900;
}

.results-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  color: var(--muted);
}

.subject-grid {
  grid-template-columns: repeat(4, 1fr);
}

.subject-card {
  display: flex;
  min-height: 232px;
  flex-direction: column;
  padding: 1rem;
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.subject-card h3 {
  margin: 0.5rem 0;
  font-family: var(--body-font);
  letter-spacing: -0.03em;
}

.subject-card p {
  font-size: 0.92rem;
}

.subject-card footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.7rem;
  margin-top: auto;
  color: var(--muted);
  font-size: 0.86rem;
}

.status-badge {
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--line);
  border-radius: 999px;
}

.status-complete {
  border-color: color-mix(in srgb, var(--success) 38%, var(--line));
  color: var(--success);
}

.empty-state {
  padding: 3rem;
  border: 1px dashed var(--line);
  border-radius: 28px;
  text-align: center;
}

.empty-state span {
  color: var(--accent);
  font-size: 4rem;
}

.philosophy-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  align-items: start;
  gap: 2rem;
}

.principle-list article {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
  padding: 1.2rem;
}

.principle-list article > span {
  color: var(--accent);
  font-size: 1.3rem;
  font-weight: 900;
}

.site-footer,
.module-footer {
  border-top: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 68%, transparent);
  color: var(--muted);
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(1px, 1px, 1px, 1px);
  clip-path: inset(50%);
  white-space: nowrap;
}

/* Subject preview */
.preview-main {
  padding: 70px 0;
}

.preview-card {
  position: relative;
  overflow: hidden;
  padding: clamp(1.5rem, 4vw, 3.2rem);
  border: 1px solid var(--line);
  border-radius: 34px;
  background: linear-gradient(145deg, var(--glass-strong), color-mix(in srgb, var(--panel) 38%, transparent));
  box-shadow: var(--shadow);
}

.preview-card .eyebrow {
  position: static;
  max-width: 100%;
  margin-bottom: 1.25rem;
}

.preview-card h1 {
  position: relative;
  z-index: 1;
  max-width: 100%;
  margin-top: 0;
  font-size: clamp(2.6rem, 6vw, 5.4rem);
  overflow-wrap: anywhere;
}

.preview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1.4rem;
}

.info-box {
  padding: 1rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag-list span {
  padding: 0.35rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--soft);
  font-size: 0.88rem;
}

/* Appearance chooser */
.appearance-launcher {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 150;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  min-height: 46px;
  padding: 0.72rem 0.95rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: color-mix(in srgb, var(--panel) 92%, transparent);
  color: var(--text);
  box-shadow: var(--shadow-soft);
  cursor: pointer;
  backdrop-filter: blur(16px);
}

.appearance-launcher svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
}

.appearance-dialog {
  width: min(520px, calc(100% - 24px));
  max-height: min(720px, calc(100vh - 32px));
  padding: 0;
  overflow: auto;
  border: 1px solid var(--line-strong);
  border-radius: 26px;
  background: var(--panel);
  color: var(--text);
  box-shadow: var(--shadow);
}

.appearance-dialog::backdrop {
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
}

.appearance-dialog-inner {
  padding: 1.35rem;
}

.appearance-dialog-header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 1rem;
}

.appearance-close {
  display: grid;
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--glass);
  color: var(--text);
  cursor: pointer;
}

.appearance-group {
  margin-top: 1.25rem;
}

.appearance-group > strong {
  display: block;
  margin-bottom: 0.65rem;
}

.theme-options,
.style-options {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.7rem;
}

.theme-option,
.style-option {
  display: flex;
  min-height: 68px;
  align-items: center;
  gap: 0.7rem;
  padding: 0.75rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--glass);
  color: var(--text);
  text-align: left;
  cursor: pointer;
}

.theme-option[aria-pressed="true"],
.style-option[aria-pressed="true"] {
  border-color: var(--accent);
  box-shadow: inset 0 0 0 1px var(--accent);
}

.theme-swatch {
  display: grid;
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  grid-template-columns: repeat(2, 1fr);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 12px;
}

.theme-swatch i {
  display: block;
}

.theme-option span:last-child,
.style-option span:last-child {
  display: block;
}

.theme-option small,
.style-option small {
  display: block;
  color: var(--muted);
}

.appearance-note {
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 0.86rem;
}

@media (max-width: 980px) {
  .hero,
  .philosophy-layout,
  .preview-grid {
    grid-template-columns: 1fr;
  }

  .path-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .subject-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .math-compass {
    min-height: 440px;
  }

  .main-nav {
    display: none;
  }

  .split-heading {
    display: block;
  }

  .header-cta {
    display: none;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(calc(100% - 22px), var(--max-width));
  }

  h1 {
    font-size: clamp(2.65rem, 14vw, 4.4rem);
  }

  .header-inner {
    flex-wrap: wrap;
  }

  .header-actions {
    margin-left: auto;
  }

  .hero {
    padding: 42px 0;
  }

  .hero-stats,
  .path-grid,
  .subject-grid,
  .theme-options,
  .style-options {
    grid-template-columns: 1fr;
  }

  .atlas-controls {
    flex-direction: column;
    align-items: stretch;
  }

  .math-compass {
    min-height: 500px;
  }

  .compass-node {
    padding: 0.55rem;
    font-size: 0.82rem;
  }

  .node-modeling { top: 42%; left: 2%; }
  .node-life { top: 42%; right: 2%; }

  .results-row,
  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .appearance-launcher span {
    display: none;
  }

  .appearance-launcher {
    right: 12px;
    bottom: 12px;
    width: 48px;
    padding: 0;
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}