@import url("https://fonts.googleapis.com/css2?family=Bebas+Neue&family=Noto+Sans+SC:wght@300;400;500;700&display=swap");

:root {
  --bg: #f4f2ed;
  --paper: #fbfaf7;
  --surface: #ffffff;
  --surface-soft: #f3f1ec;
  --surface-dark: #0d0d0d;
  --surface-dark-soft: #171717;
  --ink: #090909;
  --text: #2a2a2a;
  --muted: #646464;
  --line: rgba(9, 9, 9, 0.12);
  --line-strong: rgba(9, 9, 9, 0.26);
  --line-inverse: rgba(255, 255, 255, 0.18);
  --text-inverse: rgba(255, 255, 255, 0.9);
  --muted-inverse: rgba(255, 255, 255, 0.6);
  --signal: #c9a84c;
  --signal-soft: rgba(201, 168, 76, 0.18);
  --signal-strong: #e8c96a;
  --accent-calf: #e05c3a;
  --accent-glute: #d4a843;
  --accent-pelvis: #7ab8e8;
  --accent-core: #6ec67a;
  --accent-back: #c47ae8;
  --display-font: "Bebas Neue", "Noto Sans SC", sans-serif;
  --radius: 26px;
  --radius-sm: 18px;
  --shadow: 0 20px 60px rgba(9, 9, 9, 0.08);
  --shadow-strong: 0 28px 90px rgba(9, 9, 9, 0.18);
  --max: 1280px;
  --header-offset: 90px;
  --transition: 160ms ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font:
    16px/1.78 "Noto Sans SC", "Helvetica Neue", -apple-system,
    BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img,
svg,
iframe {
  display: block;
  max-width: 100%;
}

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

button {
  cursor: pointer;
}

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

main {
  min-height: 100vh;
}

.wrap {
  width: min(var(--max), calc(100vw - 40px));
  margin: 0 auto;
}

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 120;
  transition:
    background var(--transition),
    border-color var(--transition),
    box-shadow var(--transition);
}

.header-inner {
  min-height: var(--header-offset);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 16px 0;
}

.brand {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.brand strong,
.nav a,
.switch-note,
.switch-pill {
  letter-spacing: 0.04em;
}

.eyebrow,
.page-kicker,
.mini-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.eyebrow::before,
.page-kicker::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
  opacity: 0.7;
}

.brand strong {
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
}

.header-right {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 14px;
  flex: 1;
  min-width: 0;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
  font-size: 13px;
  font-weight: 600;
  transition:
    transform var(--transition),
    background var(--transition),
    border-color var(--transition),
    color var(--transition);
  backdrop-filter: blur(14px);
}

.nav a:hover,
.nav a:focus-visible {
  transform: translateY(-1px);
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.94);
  outline: none;
}

.nav a.is-active {
  background: var(--ink);
  border-color: var(--ink);
  color: #fff;
}

.channel-switch {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 8px 6px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.76);
  backdrop-filter: blur(16px);
}

.switch-note {
  max-width: 220px;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.45;
}

.switch-pills {
  display: flex;
  align-items: center;
  gap: 6px;
}

.switch-pill {
  min-height: 34px;
  padding: 8px 12px;
  border: 1px solid transparent;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  transition:
    background var(--transition),
    border-color var(--transition),
    color var(--transition);
}

.switch-pill:hover,
.switch-pill:focus-visible {
  border-color: var(--line);
  color: var(--ink);
  outline: none;
}

.switch-pill.is-active {
  background: var(--ink);
  color: #fff;
}

body[data-page="home"] .site-header {
  background: linear-gradient(
    to bottom,
    rgba(5, 5, 5, 0.76),
    rgba(5, 5, 5, 0.28) 62%,
    rgba(5, 5, 5, 0)
  );
  border-bottom: 1px solid transparent;
}

body[data-page="home"] .brand strong,
body[data-page="home"] .nav a,
body[data-page="home"] .switch-note,
body[data-page="home"] .switch-pill,
body[data-page="home"] .eyebrow {
  color: #fff;
}

body[data-page="home"] .hero-eyebrow {
  color: var(--signal);
}

body[data-page="home"] .nav a {
  background: rgba(17, 17, 17, 0.38);
  border-color: rgba(255, 255, 255, 0.22);
}

body[data-page="home"] .nav a:hover,
body[data-page="home"] .nav a:focus-visible {
  background: rgba(17, 17, 17, 0.56);
  border-color: rgba(255, 255, 255, 0.38);
}

body[data-page="home"] .nav a.is-active {
  background: rgba(255, 255, 255, 0.96);
  border-color: rgba(255, 255, 255, 0.96);
  color: var(--ink);
}

body[data-page="home"] .channel-switch {
  background: rgba(17, 17, 17, 0.34);
  border-color: rgba(255, 255, 255, 0.18);
}

body[data-page="home"] .switch-pill:hover,
body[data-page="home"] .switch-pill:focus-visible {
  border-color: rgba(255, 255, 255, 0.22);
  color: #fff;
}

body[data-page="home"] .switch-pill.is-active {
  background: rgba(255, 255, 255, 0.96);
  color: var(--ink);
}

body:not([data-page="home"]) .site-header {
  background: rgba(251, 250, 247, 0.9);
  border-bottom: 1px solid rgba(9, 9, 9, 0.08);
  box-shadow: 0 10px 30px rgba(9, 9, 9, 0.04);
  backdrop-filter: blur(16px);
}

.hero,
.page-hero,
.section {
  position: relative;
}

.hero-home {
  min-height: 100svh;
  color: #fff;
  overflow: clip;
  background: #000;
}

.hero-media,
.hero-poster {
  position: absolute;
  inset: 0;
}

.hero-media {
  overflow: hidden;
  background: #000;
}

.hero-media::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  background:
    radial-gradient(circle at 62% 28%, rgba(201, 168, 76, 0.22), rgba(201, 168, 76, 0) 34%),
    radial-gradient(circle at 50% 85%, rgba(201, 168, 76, 0.12), rgba(201, 168, 76, 0) 30%),
    linear-gradient(100deg, rgba(0, 0, 0, 0.92) 0%, rgba(0, 0, 0, 0.76) 44%, rgba(0, 0, 0, 0.88) 100%),
    linear-gradient(to top, rgba(0, 0, 0, 0.84), rgba(0, 0, 0, 0.08) 40%);
}

.hero-media::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 180px;
  z-index: 2;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.86), rgba(0, 0, 0, 0));
}

.hero-poster {
  background-position: center;
  background-size: cover;
  filter: grayscale(1) contrast(1.08) brightness(0.45);
  transform: scale(1.08);
}

.hero-player {
  position: absolute;
  top: 50%;
  left: 50%;
  width: max(100vw, 177.78vh);
  height: max(100svh, 56.25vw);
  transform: translate(-50%, -50%);
  opacity: 0.28;
  filter: grayscale(1) contrast(1.04) brightness(0.42) saturate(0.7);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 3;
}

.hero-home-inner {
  min-height: 100svh;
  display: grid;
  align-items: end;
  padding: clamp(128px, 18vh, 180px) 0 clamp(42px, 8vh, 72px);
}

.hero-copy {
  display: grid;
  gap: 18px;
  max-width: 760px;
}

.hero-home .hero-copy .eyebrow {
  color: var(--signal);
}

.hero-home h1,
.page-hero h1,
.section-head h2,
.timeline-card h3,
.module-card h3,
.body-node h3,
.music-card h3,
.progress-card h3,
.practice-card h3,
.graph-card h3,
.lead-card h3,
.panel h3,
.knowledge-card h4,
.step-card h3 {
  margin: 0;
  color: var(--ink);
  font-family: var(--display-font);
  font-weight: 400;
  letter-spacing: 0.03em;
  line-height: 0.95;
}

.hero-home h1 {
  max-width: 8ch;
  color: #fff;
  font-size: clamp(4rem, 9.2vw, 7.8rem);
}

.hero-eyebrow::before {
  background: rgba(232, 201, 106, 0.72);
}

.hero-quote {
  max-width: 20ch;
  margin: 0;
  color: rgba(255, 255, 255, 0.82);
  font-size: clamp(1.12rem, 2vw, 1.48rem);
  line-height: 1.6;
}

.hero-summary {
  max-width: 40rem;
  margin: 0;
  color: rgba(255, 255, 255, 0.92);
  font-size: clamp(1rem, 1.6vw, 1.12rem);
}

.hero-scroll {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  width: fit-content;
  margin-top: 6px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero-scroll:hover,
.hero-scroll:focus-visible {
  color: #fff;
  outline: none;
}

.hero-scroll-line {
  width: 1px;
  height: 56px;
  background: linear-gradient(to bottom, var(--signal-strong), rgba(201, 168, 76, 0));
  animation: hero-scroll-drift 2.2s ease-in-out infinite;
}

@keyframes hero-scroll-drift {
  0%,
  100% {
    opacity: 0.42;
    transform: scaleY(1);
  }

  50% {
    opacity: 1;
    transform: scaleY(1.14);
  }
}

.hero-actions,
.hero-meta,
.bullet-row,
.footer-links,
.mapping-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.button,
.button-light,
.button-dark,
.module-link,
.source-link,
.chip,
.source-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  transition:
    transform var(--transition),
    background var(--transition),
    border-color var(--transition),
    color var(--transition);
}

.button:hover,
.button:focus-visible,
.button-light:hover,
.button-light:focus-visible,
.button-dark:hover,
.button-dark:focus-visible,
.module-link:hover,
.module-link:focus-visible,
.source-link:hover,
.source-link:focus-visible,
.chip:hover,
.source-chip:hover {
  transform: translateY(-1px);
  outline: none;
}

.button {
  background: #fff;
  border-color: rgba(255, 255, 255, 0.78);
  color: var(--ink);
}

.button-dark {
  background: var(--ink);
  border-color: var(--ink);
  color: #fff;
}

.button-light {
  background: #fff;
  border-color: rgba(255, 255, 255, 0.24);
  color: var(--ink);
}

.chip {
  min-height: 36px;
  padding: 8px 12px;
  background: rgba(255, 255, 255, 0.82);
  font-size: 12px;
}

.chip-dark,
.section-dark .chip,
.section-dark .source-chip {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.16);
  color: #fff;
}

.hero-home .button {
  background: linear-gradient(180deg, rgba(232, 201, 106, 0.98), rgba(201, 168, 76, 0.9));
  border-color: rgba(255, 244, 225, 0.36);
  color: #111;
}

.hero-home .button-dark {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.18);
  color: #fff;
}

.hero-home .chip-dark {
  background: rgba(201, 168, 76, 0.12);
  border-color: rgba(201, 168, 76, 0.24);
  color: #fff;
}

.page-hero {
  padding: calc(var(--header-offset) + 44px) 0 30px;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.48), rgba(255, 255, 255, 0));
  border-bottom: 1px solid var(--line);
}

.page-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(300px, 0.8fr);
  gap: 20px;
  align-items: start;
}

.page-hero h1 {
  font-size: clamp(3rem, 6vw, 5rem);
  margin-bottom: 14px;
}

body[data-page="body"] .page-hero {
  padding: calc(var(--header-offset) + 64px) 0 48px;
  background:
    radial-gradient(circle at 68% 26%, rgba(201, 168, 76, 0.14), rgba(201, 168, 76, 0) 28%),
    linear-gradient(180deg, #090b10 0%, #0b0e15 74%, rgba(9, 11, 16, 0.96) 100%);
  border-bottom-color: rgba(255, 255, 255, 0.08);
}

body[data-page="body"] .page-hero h1,
body[data-page="body"] .page-hero p,
body[data-page="body"] .page-meta strong,
body[data-page="body"] .page-meta li {
  color: #fff;
}

body[data-page="body"] .page-hero .eyebrow {
  color: var(--signal);
}

body[data-page="body"] .page-meta {
  border-color: rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.04);
  box-shadow: none;
}

.page-hero-actions {
  margin-top: 22px;
}

.page-hero p,
.lead-card p,
.panel p,
.graph-card p,
.module-card p,
.body-node p,
.knowledge-card p,
.step-card p,
.music-card p,
.progress-card p,
.practice-card p,
.note-card p {
  margin: 0;
  color: var(--text);
}

.page-meta,
.panel,
.lead-card,
.module-card,
.graph-card,
.body-node,
.knowledge-card,
.step-card,
.music-card,
.progress-card,
.source-card,
.note-card,
.practice-card,
.dark-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.page-meta {
  display: grid;
  gap: 12px;
  padding: 20px;
  background: rgba(255, 255, 255, 0.78);
}

.page-meta strong,
.list-block strong,
.body-note strong,
.practice-grid strong {
  color: var(--ink);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section {
  padding: 110px 0;
  border-bottom: 1px solid var(--line);
}

.section-dark {
  background: #090909;
  color: #fff;
  border-bottom-color: rgba(255, 255, 255, 0.08);
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(280px, 0.88fr);
  gap: 18px;
  align-items: end;
  margin-bottom: 30px;
}

.section-head h2 {
  font-size: clamp(2.4rem, 4.8vw, 4.2rem);
}

.section-head p {
  margin: 0;
  color: var(--muted);
  max-width: 38rem;
}

.section-dark .section-head h2,
.section-dark .section-head p,
.section-dark .page-kicker,
.section-dark .eyebrow,
.section-dark .dark-card .page-kicker,
.section-dark .body-note-dark strong,
.section-dark .body-note-dark p,
.section-dark .step-copy p,
.section-dark .step-copy h3 {
  color: #fff;
}

.section-dark .section-head p,
.section-dark .small-copy,
.section-dark .video-note,
.section-dark .source-meta {
  color: var(--muted-inverse);
}

.section-dark .eyebrow,
.section-dark .page-kicker,
.section-dark .dark-card .page-kicker,
.section-dark .body-note-dark strong {
  color: var(--signal);
}

.section-dark .video-title strong {
  color: #fff;
}

.intro-grid,
.teaser-grid,
.node-top,
.page-hero-grid,
.section-head,
.practice-grid,
.practice-top {
  display: grid;
  gap: 20px;
}

.intro-grid,
.teaser-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.lead-card,
.panel,
.module-card,
.graph-card,
.step-card,
.music-card,
.progress-card,
.source-card,
.note-card,
.practice-card {
  padding: 24px;
}

.lead-card {
  background: rgba(255, 255, 255, 0.72);
}

.lead-card h3,
.panel h3,
.module-card h3,
.graph-card h3,
.body-node h3,
.step-card h3,
.music-card h3,
.progress-card h3,
.practice-card h3,
.source-card strong,
.note-card h3 {
  font-size: clamp(1.35rem, 2vw, 2rem);
  margin-bottom: 10px;
}

.source-card strong {
  display: block;
}

.page-kicker {
  margin-bottom: 10px;
}

.video-block,
.node-main,
.step-main,
.music-main,
.progress-main {
  display: grid;
  gap: 12px;
}

.video-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  background: #080808;
  transition:
    transform var(--transition),
    border-color var(--transition),
    box-shadow var(--transition);
}

.video-frame:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.18);
  box-shadow: var(--shadow);
}

.video-frame iframe,
.video-launch {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.video-launch {
  border: 0;
  padding: 0;
  background: #111;
  overflow: hidden;
}

.video-link-launch {
  display: block;
}

.video-launch::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(to top, rgba(0, 0, 0, 0.82), rgba(0, 0, 0, 0.08) 55%),
    linear-gradient(to right, rgba(0, 0, 0, 0.34), rgba(0, 0, 0, 0.08));
}

.video-launch img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(1) contrast(1.08);
  transition:
    transform 240ms ease,
    filter 240ms ease;
}

.video-frame:hover .video-launch img,
.video-launch:focus-visible img {
  transform: scale(1.06);
  filter: grayscale(0.7) contrast(1.06);
}

.play-badge {
  position: absolute;
  inset: auto auto 16px 16px;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 40px;
  padding: 9px 14px;
  border: 1px solid rgba(255, 255, 255, 0.26);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
  backdrop-filter: blur(10px);
}

.play-badge::before {
  content: "▶";
  font-size: 11px;
}

.video-title {
  display: grid;
  gap: 6px;
}

.video-title strong {
  color: var(--ink);
  font-size: 1rem;
}

.video-note,
.source-meta,
.small-copy,
.practice-time {
  color: var(--muted);
  font-size: 13px;
}

.hero-home .chip,
.hero-home .button-light,
.hero-home .button-dark,
.section-dark .button-light {
  box-shadow: none;
}

body[data-page="home"] #intro-video {
  background: #090909;
  border-bottom-color: rgba(255, 255, 255, 0.08);
}

body[data-page="home"] #intro-video .lead-card {
  background:
    radial-gradient(circle at top right, rgba(201, 168, 76, 0.08), rgba(201, 168, 76, 0) 40%),
    rgba(255, 255, 255, 0.03);
  border-color: var(--line-inverse);
  box-shadow: none;
}

body[data-page="home"] #intro-video .lead-card h3,
body[data-page="home"] #intro-video .lead-card p,
body[data-page="home"] #intro-video .video-title strong {
  color: #fff;
}

body[data-page="home"] #intro-video .page-kicker,
body[data-page="home"] #intro-video .video-note,
body[data-page="home"] #intro-video .source-meta {
  color: var(--signal);
}

body[data-page="home"] #intro-video .chip {
  background: rgba(201, 168, 76, 0.12);
  border-color: rgba(201, 168, 76, 0.24);
  color: #fff;
}

.mindmap-shell {
  overflow: hidden;
  border: 1px solid rgba(201, 168, 76, 0.18);
  border-radius: 34px;
  background:
    radial-gradient(circle at top, rgba(201, 168, 76, 0.12), transparent 42%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0));
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.06),
    0 0 0 1px rgba(201, 168, 76, 0.04);
}

.mindmap-svg {
  width: 100%;
  height: auto;
}

.mindmap-frame {
  fill: rgba(255, 255, 255, 0.02);
  stroke: rgba(201, 168, 76, 0.16);
}

.mindmap-line {
  stroke: rgba(201, 168, 76, 0.32);
  stroke-width: 1.2;
  stroke-dasharray: 8 10;
  animation: line-drift 14s linear infinite;
}

.mindmap-center {
  fill: rgba(201, 168, 76, 0.12);
  stroke: rgba(255, 244, 225, 0.62);
  stroke-width: 1.4;
}

.mindmap-center-title,
.mindmap-center-sub,
.mindmap-label,
.mindmap-note {
  fill: #fff;
  pointer-events: none;
}

.mindmap-center-title {
  font-size: 30px;
  letter-spacing: 0.06em;
}

.mindmap-center-sub {
  font-size: 18px;
  opacity: 0.8;
}

.mindmap-rect {
  fill: rgba(255, 255, 255, 0.03);
  stroke: rgba(201, 168, 76, 0.22);
  stroke-width: 1.1;
  transition:
    transform var(--transition),
    fill var(--transition),
    stroke var(--transition);
}

.mindmap-label {
  font-size: 18px;
  font-weight: 700;
}

.mindmap-note {
  font-size: 13px;
  fill: rgba(255, 255, 255, 0.7);
}

.mindmap-node:hover .mindmap-rect,
.mindmap-node:focus-visible .mindmap-rect {
  fill: rgba(201, 168, 76, 0.1);
  stroke: rgba(255, 244, 225, 0.54);
  transform: translateY(-2px);
}

.timeline-shell {
  display: grid;
  gap: 14px;
}

.timeline-stage {
  display: grid;
  gap: 14px;
}

.timeline-card {
  display: grid;
  grid-template-columns: minmax(0, 0.74fr) minmax(320px, 0.9fr);
  gap: 18px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 30px;
  background: var(--surface);
  box-shadow: var(--shadow);
  transition:
    transform var(--transition),
    border-color var(--transition),
    box-shadow var(--transition);
}

.timeline-card:hover {
  transform: translateY(-2px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow-strong);
}

.timeline-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.timeline-index,
.step-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--surface-soft);
  color: var(--ink);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.timeline-duration {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.timeline-copy {
  display: grid;
  gap: 12px;
}

.timeline-copy h3 {
  font-size: clamp(1.6rem, 2.4vw, 2.5rem);
}

.timeline-arrow {
  padding-left: 30px;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.04em;
}

.timeline-arrow::before {
  content: "";
  width: 1px;
  height: 40px;
  background:
    linear-gradient(to bottom, rgba(9, 9, 9, 0), rgba(9, 9, 9, 0.42), rgba(9, 9, 9, 0));
}

.timeline-actions {
  display: flex;
  gap: 10px;
  align-items: center;
}

.teaser-grid {
  grid-template-columns: minmax(0, 0.84fr) minmax(320px, 0.96fr);
  align-items: center;
}

.teaser-figure,
.figure-stage {
  border: 1px solid var(--line-inverse);
  border-radius: 34px;
  background:
    radial-gradient(circle at top, rgba(215, 176, 122, 0.16), transparent 36%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0));
}

.teaser-figure {
  min-height: 560px;
  display: grid;
  place-items: center;
  padding: 28px;
}

.scrolly-shell {
  display: grid;
  grid-template-columns: minmax(320px, 0.76fr) minmax(0, 1.24fr);
  gap: 24px;
  align-items: start;
}

.scrolly-figure-shell {
  position: relative;
}

.scrolly-figure-sticky {
  position: sticky;
  top: calc(var(--header-offset) + 24px);
}

.figure-stage {
  min-height: min(74vh, 760px);
  display: grid;
  place-items: center;
  padding: 30px;
}

.anatomy-figure {
  position: relative;
  width: min(420px, 100%);
  display: grid;
  gap: 14px;
  place-items: center;
  isolation: isolate;
}

.anatomy-figure.is-compact {
  width: min(380px, 100%);
}

.anatomy-viewport {
  position: relative;
  width: 100%;
  display: grid;
  place-items: center;
}

.anatomy-base {
  width: 100%;
  height: auto;
  border-radius: 30px;
  background: linear-gradient(180deg, #f7f3ec, #efe8dc);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.7) inset,
    0 22px 60px rgba(0, 0, 0, 0.2);
}

.anatomy-overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: auto;
}

.anatomy-figure.is-compact .anatomy-overlay {
  pointer-events: none;
}

.anatomy-zone,
.anatomy-label {
  cursor: pointer;
  outline: none;
}

.anatomy-zone path,
.anatomy-zone circle,
.anatomy-zone ellipse {
  fill: rgba(215, 176, 122, 0.04);
  stroke: rgba(215, 176, 122, 0.08);
  stroke-width: 2;
  transition:
    fill 220ms ease,
    stroke 220ms ease,
    opacity 220ms ease,
    transform 220ms ease;
  filter: drop-shadow(0 0 0 rgba(0, 0, 0, 0));
}

.anatomy-zone.is-active path,
.anatomy-zone.is-active circle,
.anatomy-zone.is-active ellipse {
  fill: rgba(215, 176, 122, 0.38);
  stroke: rgba(255, 244, 225, 0.95);
  filter: drop-shadow(0 0 18px rgba(215, 176, 122, 0.55));
}

.anatomy-zone.tone-calf.is-active path,
.anatomy-zone.tone-calf.is-active circle,
.anatomy-zone.tone-calf.is-active ellipse {
  fill: color-mix(in srgb, var(--accent-calf) 30%, transparent);
  stroke: var(--accent-calf);
  filter: drop-shadow(0 0 14px color-mix(in srgb, var(--accent-calf) 76%, transparent));
}

.anatomy-zone.tone-glute.is-active path,
.anatomy-zone.tone-glute.is-active circle,
.anatomy-zone.tone-glute.is-active ellipse {
  fill: color-mix(in srgb, var(--accent-glute) 28%, transparent);
  stroke: var(--accent-glute);
  filter: drop-shadow(0 0 14px color-mix(in srgb, var(--accent-glute) 78%, transparent));
}

.anatomy-zone.tone-pelvis.is-active path,
.anatomy-zone.tone-pelvis.is-active circle,
.anatomy-zone.tone-pelvis.is-active ellipse {
  fill: color-mix(in srgb, var(--accent-pelvis) 28%, transparent);
  stroke: var(--accent-pelvis);
  filter: drop-shadow(0 0 14px color-mix(in srgb, var(--accent-pelvis) 78%, transparent));
}

.anatomy-zone.tone-core.is-active path,
.anatomy-zone.tone-core.is-active circle,
.anatomy-zone.tone-core.is-active ellipse {
  fill: color-mix(in srgb, var(--accent-core) 28%, transparent);
  stroke: var(--accent-core);
  filter: drop-shadow(0 0 14px color-mix(in srgb, var(--accent-core) 78%, transparent));
}

.anatomy-zone.tone-back.is-active path,
.anatomy-zone.tone-back.is-active circle,
.anatomy-zone.tone-back.is-active ellipse {
  fill: color-mix(in srgb, var(--accent-back) 28%, transparent);
  stroke: var(--accent-back);
  filter: drop-shadow(0 0 14px color-mix(in srgb, var(--accent-back) 78%, transparent));
}

.anatomy-zone:hover path,
.anatomy-zone:hover circle,
.anatomy-zone:hover ellipse,
.anatomy-zone:focus path,
.anatomy-zone:focus circle,
.anatomy-zone:focus ellipse {
  fill: rgba(201, 168, 76, 0.18);
  stroke: rgba(255, 244, 225, 0.85);
}

.anatomy-label path {
  fill: none;
  stroke: rgba(215, 176, 122, 0.78);
  stroke-width: 1.3;
  stroke-dasharray: 4 8;
}

.anatomy-label text {
  fill: rgba(12, 12, 12, 0.92);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.04em;
  paint-order: stroke;
  stroke: rgba(255, 255, 255, 0.9);
  stroke-width: 6px;
  stroke-linejoin: round;
}

.anatomy-label.is-active text {
  fill: rgba(12, 12, 12, 1);
}

.anatomy-label.is-active path {
  stroke: rgba(215, 176, 122, 1);
}

.anatomy-label.tone-calf.is-active path {
  stroke: var(--accent-calf);
}

.anatomy-label.tone-glute.is-active path {
  stroke: var(--accent-glute);
}

.anatomy-label.tone-pelvis.is-active path {
  stroke: var(--accent-pelvis);
}

.anatomy-label.tone-core.is-active path {
  stroke: var(--accent-core);
}

.anatomy-label.tone-back.is-active path {
  stroke: var(--accent-back);
}

.anatomy-label:hover path,
.anatomy-label:focus path {
  stroke: rgba(255, 244, 225, 0.95);
}

.anatomy-progress {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.anatomy-dot {
  width: 12px;
  height: 12px;
  border: 1px solid rgba(201, 168, 76, 0.4);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  box-shadow: none;
  transition:
    transform var(--transition),
    border-color var(--transition),
    background var(--transition),
    box-shadow var(--transition);
}

.anatomy-dot:hover,
.anatomy-dot:focus-visible {
  border-color: rgba(255, 244, 225, 0.65);
  background: rgba(201, 168, 76, 0.22);
  transform: scale(1.08);
  outline: none;
}

.anatomy-dot.is-active {
  border-color: rgba(255, 244, 225, 0.9);
  background: var(--signal);
  box-shadow:
    0 0 0 3px rgba(201, 168, 76, 0.12),
    0 0 24px rgba(201, 168, 76, 0.4);
  transform: scale(1.18);
}

.anatomy-credit {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  margin-top: 12px;
  padding: 12px 16px;
  border-radius: 999px;
  border: 1px solid var(--line-inverse);
  background: rgba(255, 255, 255, 0.04);
  color: var(--muted-inverse);
  font-size: 12px;
}

.anatomy-credit a {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.scrolly-steps {
  display: grid;
  gap: 28px;
}

.muscle-step,
.dark-card {
  border: 1px solid var(--line-inverse);
  border-radius: 30px;
  background: rgba(255, 255, 255, 0.03);
  box-shadow: none;
}

.muscle-step {
  display: grid;
  grid-template-columns: 110px minmax(0, 0.84fr) minmax(320px, 0.98fr);
  gap: 22px;
  padding: 28px;
  min-height: 76vh;
  align-items: center;
  transition:
    transform var(--transition),
    border-color var(--transition),
    background var(--transition);
}

.muscle-step.is-active {
  border-color: rgba(215, 176, 122, 0.7);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.03));
  transform: translateX(-4px);
}

.step-rail {
  align-self: stretch;
  display: grid;
  align-content: start;
  gap: 12px;
}

.step-number {
  font-family: var(--display-font);
  font-size: clamp(4.6rem, 7vw, 6.2rem);
  line-height: 0.86;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.09);
}

.step-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  min-height: 30px;
  padding: 4px 12px;
  border: 1px solid currentColor;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.step-tag--calf {
  color: var(--accent-calf);
}

.step-tag--glute {
  color: var(--accent-glute);
}

.step-tag--pelvis {
  color: var(--accent-pelvis);
}

.step-tag--core {
  color: var(--accent-core);
}

.step-tag--back {
  color: var(--accent-back);
}

.step-copy {
  display: grid;
  gap: 14px;
}

.step-overline {
  color: var(--signal);
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
}

.step-copy h3 {
  font-family: var(--display-font);
  font-size: clamp(2.1rem, 4vw, 3rem);
  letter-spacing: 0.04em;
  line-height: 1;
}

.muscle-english {
  margin: 0;
  color: var(--muted-inverse);
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.muscle-role {
  margin: 0;
  color: rgba(255, 255, 255, 0.9);
  font-size: 1rem;
  line-height: 1.95;
}

.muscle-error {
  display: grid;
  gap: 8px;
  padding: 14px 16px 14px 18px;
  border-left: 2px solid var(--accent-calf);
  background: rgba(224, 92, 58, 0.08);
}

.muscle-error strong {
  color: #fff;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.muscle-error p {
  margin: 0;
  color: rgba(255, 255, 255, 0.9);
  line-height: 1.8;
}

.step-media {
  display: grid;
  gap: 14px;
}

.dark-card {
  padding: 0;
  overflow: hidden;
}

.journey-video {
  background: rgba(255, 255, 255, 0.04);
}

.journey-video-label {
  min-height: 34px;
  display: flex;
  align-items: center;
  padding: 0 14px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.journey-video-label--train {
  color: var(--signal);
}

.journey-video-label--dance {
  color: var(--accent-pelvis);
}

.journey-video .video-block,
.journey-video .video-title {
  gap: 0;
}

.journey-video .video-title {
  padding: 14px 16px 16px;
}

.journey-video .video-title strong {
  font-size: 0.92rem;
}

.body-note,
.body-note-dark {
  display: grid;
  gap: 8px;
  padding: 16px 18px;
  border-radius: 20px;
  border: 1px solid var(--line);
  background: var(--surface-soft);
}

.body-note p,
.body-note-dark p {
  color: var(--text);
}

.body-note-dark {
  border-color: rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.05);
}

.muscle-step--calf .step-number {
  color: color-mix(in srgb, var(--accent-calf) 34%, rgba(255, 255, 255, 0.06));
}

.muscle-step--glute .step-number {
  color: color-mix(in srgb, var(--accent-glute) 34%, rgba(255, 255, 255, 0.06));
}

.muscle-step--pelvis .step-number {
  color: color-mix(in srgb, var(--accent-pelvis) 36%, rgba(255, 255, 255, 0.06));
}

.muscle-step--core .step-number {
  color: color-mix(in srgb, var(--accent-core) 34%, rgba(255, 255, 255, 0.06));
}

.muscle-step--back .step-number {
  color: color-mix(in srgb, var(--accent-back) 34%, rgba(255, 255, 255, 0.06));
}

.muscle-step--calf .muscle-error {
  border-left-color: var(--accent-calf);
  background: rgba(224, 92, 58, 0.08);
}

.muscle-step--glute .muscle-error {
  border-left-color: var(--accent-glute);
  background: rgba(212, 168, 67, 0.08);
}

.muscle-step--pelvis .muscle-error {
  border-left-color: var(--accent-pelvis);
  background: rgba(122, 184, 232, 0.08);
}

.muscle-step--core .muscle-error {
  border-left-color: var(--accent-core);
  background: rgba(110, 198, 122, 0.08);
}

.muscle-step--back .muscle-error {
  border-left-color: var(--accent-back);
  background: rgba(196, 122, 232, 0.08);
}

.muscle-step--calf.is-active {
  border-color: color-mix(in srgb, var(--accent-calf) 46%, rgba(255, 255, 255, 0.14));
  background: linear-gradient(180deg, rgba(224, 92, 58, 0.12), rgba(255, 255, 255, 0.03));
}

.muscle-step--glute.is-active {
  border-color: color-mix(in srgb, var(--accent-glute) 48%, rgba(255, 255, 255, 0.14));
  background: linear-gradient(180deg, rgba(212, 168, 67, 0.12), rgba(255, 255, 255, 0.03));
}

.muscle-step--pelvis.is-active {
  border-color: color-mix(in srgb, var(--accent-pelvis) 46%, rgba(255, 255, 255, 0.14));
  background: linear-gradient(180deg, rgba(122, 184, 232, 0.11), rgba(255, 255, 255, 0.03));
}

.muscle-step--core.is-active {
  border-color: color-mix(in srgb, var(--accent-core) 46%, rgba(255, 255, 255, 0.14));
  background: linear-gradient(180deg, rgba(110, 198, 122, 0.11), rgba(255, 255, 255, 0.03));
}

.muscle-step--back.is-active {
  border-color: color-mix(in srgb, var(--accent-back) 46%, rgba(255, 255, 255, 0.14));
  background: linear-gradient(180deg, rgba(196, 122, 232, 0.11), rgba(255, 255, 255, 0.03));
}

.node-top {
  grid-template-columns: minmax(0, 0.86fr) minmax(320px, 0.94fr);
  align-items: start;
}

.body-grid,
.step-grid,
.music-grid,
.progress-grid,
.practice-timeline {
  display: grid;
  gap: 22px;
}

.section-body-deep {
  background:
    radial-gradient(circle at top center, rgba(201, 168, 76, 0.08), rgba(201, 168, 76, 0) 30%),
    linear-gradient(180deg, #090b10 0%, #0b0f16 100%);
  border-bottom-color: rgba(255, 255, 255, 0.08);
}

.section-body-deep .body-node,
.section-body-deep .knowledge-card {
  border-color: rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.04);
  box-shadow: none;
}

.section-body-deep .body-node h3,
.section-body-deep .knowledge-card h4,
.section-body-deep .body-node p,
.section-body-deep .knowledge-card p,
.section-body-deep .list-block strong,
.section-body-deep .page-kicker,
.section-body-deep .body-note strong,
.section-body-deep .body-note p,
.section-body-deep li {
  color: #fff;
}

.section-body-deep .page-kicker {
  color: var(--signal);
}

.section-body-deep .body-note {
  border-color: rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.05);
}

.section-body-deep .video-title strong {
  color: #fff;
}

.section-body-deep .video-note,
.section-body-deep .source-meta {
  color: var(--muted-inverse);
}

.body-node {
  padding: 26px;
}

.body-copy {
  display: grid;
  gap: 14px;
}

.list-block {
  display: grid;
  gap: 8px;
}

.knowledge-grid,
.source-grid,
.module-grid,
.graph-grid {
  display: grid;
  gap: 16px;
}

.knowledge-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 18px;
}

.knowledge-card {
  padding: 18px;
}

.knowledge-card h4 {
  font-size: 1.34rem;
  margin-bottom: 8px;
}

.module-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.graph-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.module-card {
  display: grid;
  gap: 18px;
}

.module-link,
.source-link {
  justify-self: start;
}

.mapping-row span {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-soft);
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.beat-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.beat {
  display: grid;
  place-items: center;
  min-height: 170px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: linear-gradient(180deg, #fff, var(--surface-soft));
  box-shadow: var(--shadow);
}

.beat strong {
  color: var(--ink);
  font-size: clamp(2.4rem, 5vw, 4.4rem);
  font-family:
    "Iowan Old Style", "Palatino Linotype", "Baskerville", "Songti SC",
    "Hiragino Mincho ProN", serif;
  line-height: 1;
}

.beat span {
  color: var(--muted);
  font-size: 14px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.practice-intro-card {
  padding: 28px;
}

.practice-card {
  position: relative;
  padding: 26px;
}

.practice-card::before {
  content: "";
  position: absolute;
  inset: 28px auto 28px 0;
  width: 3px;
  border-radius: 999px;
  background:
    linear-gradient(to bottom, rgba(215, 176, 122, 0.1), rgba(215, 176, 122, 0.9), rgba(215, 176, 122, 0.1));
}

.practice-top {
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: start;
}

.source-chip {
  min-height: 34px;
  background: var(--surface-soft);
  font-size: 12px;
}

.practice-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.practice-video-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}

.source-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.source-card {
  display: grid;
  gap: 12px;
}

.footer-shell {
  padding: 42px 0 54px;
  display: grid;
  gap: 14px;
}

.site-footer {
  background: #090909;
  color: #fff;
}

.site-footer p {
  max-width: 72ch;
  margin: 0;
  color: var(--muted-inverse);
}

.site-footer .source-link {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.14);
  color: #fff;
}

.site-footer .eyebrow {
  color: rgba(255, 255, 255, 0.7);
  background: transparent;
}

.site-footer .eyebrow::before {
  background: rgba(255, 255, 255, 0.7);
}

ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

li + li {
  margin-top: 6px;
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
  transition:
    opacity 520ms ease,
    transform 520ms ease;
}

@keyframes line-drift {
  from {
    stroke-dashoffset: 0;
  }
  to {
    stroke-dashoffset: -120;
  }
}

@media (max-width: 1180px) {
  .header-inner,
  .header-right {
    gap: 12px;
  }

  .channel-switch {
    padding-inline: 10px;
  }

  .switch-note {
    max-width: 160px;
  }

  .timeline-card,
  .node-top,
  .teaser-grid,
  .page-hero-grid,
  .section-head,
  .scrolly-shell,
  .muscle-step {
    grid-template-columns: 1fr;
  }

  .timeline-video,
  .node-main,
  .step-main,
  .music-main,
  .progress-main,
  .teaser-figure {
    max-width: 720px;
  }

  .module-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .graph-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .knowledge-grid,
  .practice-video-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .scrolly-figure-sticky {
    position: static;
  }

  .figure-stage {
    min-height: auto;
  }

  .muscle-step {
    min-height: auto;
  }

  .step-rail {
    grid-template-columns: auto auto;
    align-items: end;
  }
}

@media (max-width: 900px) {
  :root {
    --header-offset: 116px;
  }

  .wrap {
    width: min(var(--max), calc(100vw - 28px));
  }

  .header-inner,
  .header-right {
    flex-direction: column;
    align-items: stretch;
  }

  .brand {
    justify-items: center;
  }

  .nav {
    justify-content: center;
  }

  .channel-switch {
    flex-direction: column;
    align-items: stretch;
    border-radius: 24px;
  }

  .switch-note {
    max-width: none;
    text-align: center;
  }

  .switch-pills {
    justify-content: center;
    flex-wrap: wrap;
  }

  .hero-home-inner {
    align-items: center;
    padding-top: calc(var(--header-offset) + 36px);
  }

  .hero-home h1 {
    max-width: none;
  }

  .intro-grid,
  .practice-grid,
  .source-grid,
  .module-grid,
  .knowledge-grid,
  .practice-video-grid,
  .graph-grid,
  .page-hero-grid,
  .section-head {
    grid-template-columns: 1fr;
  }

  .timeline-card {
    padding: 20px;
  }

  .practice-top {
    grid-template-columns: 1fr;
  }

  .anatomy-figure {
    width: min(92vw, 420px);
  }

  .anatomy-label text {
    font-size: 13px;
  }
}

@media (max-width: 720px) {
  :root {
    --header-offset: 128px;
    --radius: 22px;
    --radius-sm: 16px;
  }

  .section {
    padding: 82px 0;
  }

  .hero-home-inner {
    min-height: 100svh;
    padding-bottom: 36px;
  }

  .hero-home h1 {
    font-size: clamp(3.3rem, 16vw, 4.8rem);
  }

  .hero-quote {
    font-size: 1.02rem;
  }

  .hero-summary {
    font-size: 0.98rem;
  }

  .lead-card,
  .panel,
  .module-card,
  .graph-card,
  .body-node,
  .step-card,
  .music-card,
  .progress-card,
  .practice-card,
  .note-card {
    padding: 20px;
  }

  .journey-video {
    padding: 0;
  }

  .timeline-card,
  .muscle-step {
    padding: 18px;
  }

  .timeline-meta {
    align-items: center;
  }

  .beat-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .practice-card::before {
    inset: 18px auto 18px 0;
  }

  .play-badge {
    left: 12px;
    right: 12px;
    bottom: 12px;
    justify-content: center;
  }

  .scrolly-shell {
    display: block;
  }

  .scrolly-figure-shell {
    margin-bottom: 16px;
  }

  .scrolly-figure-sticky {
    position: sticky;
    top: calc(var(--header-offset) + 8px);
  }

  .figure-stage {
    min-height: auto;
    padding: 16px;
  }

  .scrolly-steps {
    display: flex;
    gap: 14px;
    overflow-x: auto;
    padding-bottom: 10px;
    scroll-snap-type: x mandatory;
  }

  .muscle-step {
    min-width: min(86vw, 420px);
    grid-template-columns: 1fr;
    scroll-snap-align: start;
    min-height: auto;
  }

  .step-rail {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .step-number {
    font-size: clamp(3.8rem, 18vw, 4.8rem);
  }

  .step-media {
    grid-template-columns: 1fr;
  }

  .anatomy-credit {
    border-radius: 18px;
    padding: 10px 12px;
    flex-direction: column;
    align-items: flex-start;
  }
}