:root {
  --ink: #172027;
  --muted: #64717b;
  --paper: #fff8f4;
  --white: #ffffff;
  --line: rgba(23, 32, 39, 0.12);
  --aqua: #42c9d6;
  --momo: #ff6fa9;
  --ume: #7b55c7;
  --matcha: #70a970;
  --yuzu: #f2bf45;
  --night: #1f2630;
  --shadow: 0 24px 70px rgba(31, 38, 48, 0.16);
  --radius: 8px;
  --font-display: "Fraunces", "Noto Sans JP", serif;
  --font-body: "Inter", "Noto Sans JP", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.6;
  letter-spacing: 0;
  overflow-x: hidden;
}

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

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

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

button {
  font: inherit;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  padding: 10px 16px;
  color: var(--white);
  background: var(--night);
  border-radius: 8px;
  font-weight: 800;
  transform: translateY(-150%);
  transition: transform 160ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

:focus-visible {
  outline: 3px solid var(--ume);
  outline-offset: 2px;
}

.scroll-progress {
  position: fixed;
  inset: 0 0 auto;
  height: 3px;
  z-index: 100;
  background: transparent;
}

.scroll-progress span {
  display: block;
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--aqua), var(--momo), var(--yuzu));
}

.ambient--grid {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    linear-gradient(rgba(23, 32, 39, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 32, 39, 0.035) 1px, transparent 1px);
  background-size: 38px 38px, 38px 38px;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 18px;
  min-height: 74px;
  padding: 14px clamp(18px, 4vw, 48px);
  background: rgba(255, 248, 244, 0.82);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: max-content;
}

.nav__brand img {
  width: 40px;
  height: 40px;
  border: 2px solid var(--white);
  border-radius: 50%;
  box-shadow: 0 6px 16px rgba(23, 32, 39, 0.16);
}

.nav__brand strong,
.nav__brand small {
  display: block;
  line-height: 1.1;
}

.nav__brand strong {
  font-family: var(--font-display);
  font-size: 19px;
}

.nav__brand small {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

.nav__links {
  display: flex;
  justify-content: center;
  gap: clamp(14px, 2vw, 28px);
  flex: 1;
}

.nav__links a {
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.nav__links a:hover {
  color: var(--ink);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav__toggle {
  display: none;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.nav__toggle span {
  width: 18px;
  height: 2px;
  background: var(--ink);
}

.lang-switch {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  padding: 3px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.lang-switch button {
  min-width: 34px;
  height: 32px;
  color: var(--muted);
  background: transparent;
  border: 0;
  border-radius: 6px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 800;
}

.lang-switch button.is-active {
  color: var(--white);
  background: var(--night);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 800;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

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

.btn--primary {
  color: var(--white);
  background: linear-gradient(135deg, var(--night), #5635a5 55%, #d94d87);
  box-shadow: 0 14px 30px rgba(123, 85, 199, 0.25);
}

.btn--light {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.86);
  border-color: var(--line);
}

.btn--dark {
  color: var(--white);
  background: var(--night);
}

.btn--text {
  color: var(--ink);
  padding-inline: 4px;
}

.btn--small {
  min-height: 38px;
  padding-inline: 14px;
  font-size: 13px;
}

.hero {
  min-height: calc(100vh - 150px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.92fr);
  align-items: center;
  gap: clamp(28px, 5vw, 72px);
  padding: clamp(34px, 5vw, 62px) clamp(20px, 5vw, 72px) 40px;
}

.hero__copy,
.hero__visual,
.section-head,
.path-card,
.quick__item {
  min-width: 0;
}

.eyebrow {
  margin: 0 0 14px;
  color: #9e245e;
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero h1,
.section h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 750;
  line-height: 0.98;
  letter-spacing: 0;
}

.hero h1 {
  max-width: min(780px, 100%);
  font-size: clamp(50px, 7vw, 94px);
}

.hero__lead {
  max-width: min(650px, 100%);
  margin: 28px 0 0;
  color: #42505a;
  font-size: clamp(17px, 2vw, 21px);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.hero__proof {
  display: grid;
  grid-template-columns: repeat(4, minmax(110px, 1fr));
  gap: 10px;
  max-width: 680px;
  margin-top: 34px;
}

.hero__proof span {
  min-height: 76px;
  padding: 14px;
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.hero__proof strong {
  display: block;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 28px;
  line-height: 1;
}

.snapshot {
  display: block;
  margin-top: 12px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.proof-grid .snapshot {
  grid-column: 1 / -1;
  margin-top: 0;
}

.hero__visual {
  position: relative;
  min-height: 540px;
}

.hero-scene {
  position: absolute;
  inset: 34px 0 0 42px;
  margin: 0;
  overflow: hidden;
  background: var(--white);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.hero-scene img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.live-panel,
.sensei-card {
  position: absolute;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 18px 48px rgba(23, 32, 39, 0.16);
  backdrop-filter: blur(16px);
}

.live-panel {
  left: 0;
  top: 0;
  max-width: 280px;
  padding: 14px 16px;
}

.live-panel__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--muted);
  box-shadow: 0 0 0 8px rgba(100, 113, 123, 0.12);
}

.live-panel.is-live .live-panel__dot {
  background: #19b36b;
  box-shadow: 0 0 0 8px rgba(25, 179, 107, 0.14);
}

.live-panel small,
.sensei-card small {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.live-panel strong,
.sensei-card strong {
  display: block;
  line-height: 1.2;
}

.sensei-card {
  right: 0;
  bottom: 26px;
  padding: 12px 18px 12px 12px;
}

.sensei-card img {
  width: 72px;
  height: 72px;
  object-fit: cover;
  border-radius: 8px;
}

.quick {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin-top: -1px;
  background: var(--line);
  border-block: 1px solid var(--line);
}

.quick__item {
  min-height: 152px;
  padding: clamp(20px, 3vw, 32px);
  background: rgba(255, 255, 255, 0.78);
}

.quick__item span {
  display: inline-flex;
  min-width: 52px;
  min-height: 28px;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--white);
  background: var(--night);
  border-radius: 6px;
  font-size: 12px;
  font-weight: 900;
}

.quick__item:nth-child(2) span {
  background: var(--momo);
}

.quick__item:nth-child(3) span {
  background: #d64242;
}

.quick__item:nth-child(4) span {
  background: #5865f2;
}

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

.quick__item strong {
  font-size: 20px;
  line-height: 1.2;
}

.quick__item small {
  margin-top: 6px;
  color: var(--muted);
  font-weight: 700;
}

.section {
  padding: clamp(70px, 9vw, 120px) clamp(20px, 5vw, 72px);
}

.section--story,
.section--proof {
  background: rgba(255, 255, 255, 0.62);
  border-block: 1px solid var(--line);
}

.section--method {
  background: linear-gradient(180deg, rgba(255, 248, 244, 0.92), rgba(255, 255, 255, 0.72));
}

.section--lab {
  color: var(--white);
  background-color: var(--night);
  background-position: center;
  background-size: cover;
  background-image:
    linear-gradient(135deg, rgba(31, 38, 48, 0.96), rgba(68, 49, 112, 0.95)),
    url("../images/class-vr-opt.jpg");
  background-image:
    linear-gradient(135deg, rgba(31, 38, 48, 0.96), rgba(68, 49, 112, 0.95)),
    image-set(
      url("../images/class-vr-opt.webp") type("image/webp"),
      url("../images/class-vr-opt.jpg") type("image/jpeg")
    );
}

.section--route {
  background: rgba(255, 255, 255, 0.68);
  border-block: 1px solid var(--line);
}

.section--connect {
  background: var(--night);
  color: var(--white);
}

.wrap {
  width: min(1180px, 100%);
  margin-inline: auto;
}

.section-head {
  max-width: 720px;
  margin: 0 auto 42px;
  text-align: center;
}

.section-head--left {
  margin-inline: 0;
  text-align: left;
}

.section h2 {
  font-size: clamp(38px, 5.2vw, 72px);
}

.section-head p:not(.eyebrow),
.story-copy p,
.proof-panel p {
  color: var(--muted);
  font-size: 18px;
}

.section--lab .section-head p,
.section--connect .section-head p,
.section--lab .eyebrow,
.section--connect .eyebrow {
  color: rgba(255, 255, 255, 0.78);
}

.story-grid,
.lab-grid,
.proof-grid,
.connect-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(320px, 1.05fr);
  gap: clamp(28px, 6vw, 70px);
  align-items: start;
}

.story-stack {
  display: grid;
  gap: 14px;
}

.story-stack article,
.proof-panel,
.metric-board,
.quote,
.lesson-card,
.connect-list,
.price-card {
  border: 1px solid var(--line);
  border-radius: 8px;
}

.story-stack article {
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 6px 18px;
  min-height: 128px;
  padding: 22px;
  background: var(--white);
}

.story-stack span {
  grid-row: span 2;
  color: var(--momo);
  font-family: var(--font-display);
  font-size: 34px;
  line-height: 1;
}

.story-stack strong {
  font-size: 20px;
}

.story-stack p {
  margin: 0;
  color: var(--muted);
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.method-step {
  min-height: 260px;
  padding: 24px;
  background: rgba(255, 255, 255, 0.84);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 18px 48px rgba(31, 38, 48, 0.07);
}

.method-step span {
  display: inline-flex;
  width: 46px;
  height: 46px;
  align-items: center;
  justify-content: center;
  margin-bottom: 34px;
  color: var(--white);
  background: var(--night);
  border-radius: 50%;
  font-family: var(--font-display);
  font-size: 20px;
  line-height: 1;
}

.method-step:nth-child(2) span {
  background: var(--ume);
}

.method-step:nth-child(3) span {
  background: var(--momo);
}

.method-step:nth-child(4) span {
  background: var(--matcha);
}

.method-step strong,
.route-panel h3 {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(24px, 2.6vw, 34px);
  line-height: 1.08;
}

.method-step p {
  margin: 14px 0 0;
  color: var(--muted);
}

.method-proof {
  display: grid;
  grid-template-columns: minmax(220px, 0.42fr) minmax(0, 1fr);
  gap: 28px;
  align-items: center;
  margin-top: 18px;
  padding: clamp(24px, 4vw, 36px);
  color: var(--white);
  background: linear-gradient(135deg, var(--night), #543c92 58%, #bc3e7a);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.method-proof span {
  display: block;
  color: rgba(255, 255, 255, 0.68);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.method-proof strong {
  display: block;
  margin-top: 8px;
  font-family: var(--font-display);
  font-size: clamp(26px, 3vw, 42px);
  line-height: 1.08;
}

.method-proof p {
  margin: 0;
  color: rgba(255, 255, 255, 0.76);
  font-size: 18px;
}

.path-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.path-card {
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 20px 60px rgba(31, 38, 48, 0.08);
}

.path-card--feature {
  grid-column: span 2;
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(280px, 0.8fr);
}

.path-card img {
  width: 100%;
  height: 270px;
  object-fit: cover;
}

.path-card--feature img {
  height: 100%;
}

.path-card > div {
  padding: 24px;
}

.tag {
  display: inline-flex;
  margin-bottom: 12px;
  padding: 5px 9px;
  color: #763555;
  background: #ffe5ef;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 900;
}

.path-card h3,
.lesson-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 3vw, 38px);
  line-height: 1.05;
}

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

.route-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.86fr) minmax(340px, 0.9fr);
  gap: clamp(28px, 6vw, 70px);
  align-items: center;
}

.route-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}

.route-tabs button {
  min-height: 40px;
  padding: 0 14px;
  color: var(--muted);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 900;
}

.route-tabs button.is-active {
  color: var(--white);
  background: var(--night);
  border-color: var(--night);
}

.route-panel {
  min-height: 470px;
  padding: clamp(26px, 4vw, 42px);
  background: linear-gradient(180deg, var(--white), rgba(255, 255, 255, 0.82));
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.route-panel > span {
  display: inline-flex;
  margin-bottom: 18px;
  padding: 6px 10px;
  color: #763555;
  background: #ffe5ef;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.route-panel p {
  color: #42505a;
  font-size: 18px;
}

.route-panel dl {
  display: grid;
  gap: 12px;
  margin: 26px 0;
}

.route-panel dl div {
  padding: 16px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.route-panel dt {
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.route-panel dd {
  margin: 4px 0 0;
  color: var(--ink);
  font-weight: 700;
}

.lab-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.lesson-card {
  min-height: 460px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: clamp(24px, 5vw, 44px);
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(16px);
}

.lesson-card__meta {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  color: rgba(255, 255, 255, 0.78);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.lesson-card p {
  color: rgba(255, 255, 255, 0.78);
  font-size: 20px;
}

.phrase {
  padding: 22px;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
}

.phrase span,
.phrase small,
.phrase strong {
  display: block;
}

.phrase span {
  font-family: "Noto Sans JP", sans-serif;
  font-size: clamp(30px, 5vw, 52px);
  font-weight: 800;
  line-height: 1.1;
}

.phrase small {
  margin-top: 8px;
  color: rgba(255, 255, 255, 0.62);
  font-weight: 800;
}

.phrase strong {
  margin-top: 4px;
  font-size: 20px;
}

.latest-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.latest-grid--atlas {
  grid-template-columns: repeat(6, minmax(0, 1fr));
}

.video-card {
  display: block;
  overflow: hidden;
  min-height: 100%;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.video-card img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.video-card span,
.video-card strong,
.video-card small {
  display: block;
  padding-inline: 18px;
}

.video-card span {
  padding-top: 18px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.video-card strong {
  padding-bottom: 20px;
  font-size: 20px;
  line-height: 1.25;
}

.video-card--mission {
  grid-column: span 2;
}

.video-card--mission img {
  aspect-ratio: 16 / 9;
}

.video-card--mission strong {
  padding-bottom: 8px;
}

.video-card--mission small {
  padding-bottom: 20px;
  color: var(--muted);
  font-weight: 700;
}

.proof-panel {
  padding: clamp(26px, 5vw, 42px);
  background: var(--white);
}

.metric-board {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  overflow: hidden;
  background: var(--white);
}

.metric-board div {
  min-height: 158px;
  padding: 26px;
  border: 1px solid var(--line);
}

.metric-board strong {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(38px, 5vw, 64px);
  line-height: 1;
}

.metric-board span {
  color: var(--muted);
  font-weight: 800;
}

.quote-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 28px;
}

.quote {
  margin: 0;
  padding: 24px;
  background: var(--white);
}

.quote p {
  margin: 0;
  color: #3b4851;
}

.quote cite {
  display: block;
  margin-top: 18px;
  color: var(--muted);
  font-size: 13px;
  font-style: normal;
  font-weight: 900;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.price-card {
  min-height: 250px;
  padding: 24px;
  background: var(--white);
}

.price-card--hot {
  color: var(--white);
  background: linear-gradient(150deg, var(--night), #6e4cc8 55%, #ca4c78);
}

.price-card span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  font-weight: 900;
  text-transform: uppercase;
}

.price-card--hot span {
  color: rgba(255, 255, 255, 0.72);
}

.price-card strong {
  display: block;
  margin-top: 20px;
  font-family: var(--font-display);
  font-size: 44px;
  line-height: 1;
}

.price-card strong .per {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  color: var(--muted);
}

.price-card--hot strong .per {
  color: rgba(255, 255, 255, 0.72);
}

.price-card p {
  color: var(--muted);
}

.price-card--hot p {
  color: rgba(255, 255, 255, 0.76);
}

.center-cta {
  margin-top: 26px;
  text-align: center;
}

.topic-hero {
  padding: clamp(54px, 8vw, 104px) clamp(20px, 5vw, 72px);
  background:
    linear-gradient(rgba(23, 32, 39, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 32, 39, 0.035) 1px, transparent 1px),
    linear-gradient(120deg, rgba(66, 201, 214, 0.18), rgba(255, 248, 244, 0.92) 42%, rgba(255, 111, 169, 0.14));
  background-size: 38px 38px, 38px 38px, auto;
  border-bottom: 1px solid var(--line);
}

.topic-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.54fr);
  gap: clamp(28px, 6vw, 72px);
  align-items: center;
}

.topic-hero h1 {
  max-width: 820px;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(48px, 7vw, 86px);
  line-height: 0.98;
}

.topic-hero__copy > p:not(.eyebrow) {
  max-width: 680px;
  margin: 24px 0 0;
  color: #42505a;
  font-size: clamp(17px, 2vw, 21px);
}

.topic-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.topic-proof {
  display: grid;
  gap: 1px;
  overflow: hidden;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.topic-proof div {
  min-height: 138px;
  padding: 24px;
  background: rgba(255, 255, 255, 0.86);
}

.topic-proof span,
.topic-item__body > span,
.topic-family-card span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.topic-proof strong {
  display: block;
  margin-top: 8px;
  font-family: var(--font-display);
  font-size: 34px;
  line-height: 1;
}

.topic-proof small {
  display: block;
  margin-top: 10px;
  color: var(--muted);
  font-weight: 700;
}

.section--topics {
  background: rgba(255, 255, 255, 0.64);
  border-bottom: 1px solid var(--line);
}

.topic-family-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.topic-family-card {
  min-height: 238px;
  padding: 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 18px 48px rgba(31, 38, 48, 0.07);
}

.topic-family-card h3,
.topic-item h3,
.source-band h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  line-height: 1.08;
}

.topic-family-card h3 {
  font-size: clamp(24px, 2.5vw, 34px);
}

.topic-family-card p {
  color: var(--muted);
}

.section--archive {
  background: linear-gradient(180deg, rgba(255, 248, 244, 0.94), rgba(255, 255, 255, 0.78));
}

.topic-list {
  display: grid;
  gap: 16px;
}

.topic-item {
  display: grid;
  grid-template-columns: minmax(220px, 0.36fr) minmax(0, 1fr);
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.topic-item img {
  width: 100%;
  height: 100%;
  min-height: 230px;
  object-fit: cover;
}

.topic-item__body {
  padding: clamp(22px, 4vw, 34px);
}

.topic-item h3 {
  font-size: clamp(26px, 3vw, 40px);
}

.topic-item p {
  color: #42505a;
  font-size: 17px;
}

.topic-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.topic-links a {
  min-height: 36px;
  display: inline-flex;
  align-items: center;
  padding: 0 12px;
  color: var(--ink);
  background: rgba(255, 248, 244, 0.78);
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 13px;
  font-weight: 900;
}

.source-band {
  display: grid;
  grid-template-columns: minmax(240px, 0.44fr) minmax(0, 1fr);
  gap: clamp(22px, 4vw, 44px);
  align-items: start;
  padding: clamp(24px, 4vw, 36px);
  color: var(--white);
  background: var(--night);
  border-radius: 8px;
}

.source-band .eyebrow,
.source-band p {
  color: rgba(255, 255, 255, 0.72);
}

.source-band h2 {
  font-size: clamp(30px, 4vw, 52px);
}

.source-band p {
  margin: 0;
  font-size: 18px;
}

.not-found {
  min-height: calc(100vh - 170px);
  display: grid;
  align-items: center;
  padding: clamp(60px, 9vw, 120px) clamp(20px, 5vw, 72px);
}

.not-found__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.52fr);
  gap: clamp(28px, 6vw, 72px);
  align-items: center;
}

.not-found h1 {
  max-width: 760px;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(52px, 8vw, 96px);
  line-height: 0.98;
}

.not-found p:not(.eyebrow) {
  max-width: 680px;
  margin: 24px 0 0;
  color: #42505a;
  font-size: clamp(17px, 2vw, 21px);
}

.connect-list {
  display: grid;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.14);
}

.connect-list a {
  display: grid;
  grid-template-columns: minmax(130px, 0.5fr) 1fr;
  gap: 18px;
  padding: 18px 22px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.connect-list a:last-child {
  border-bottom: 0;
}

.connect-list strong {
  color: var(--white);
}

.connect-list span {
  color: rgba(255, 255, 255, 0.65);
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 28px clamp(20px, 5vw, 72px);
  background: #11171d;
  color: rgba(255, 255, 255, 0.72);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.footer strong,
.footer span {
  display: block;
}

.footer strong,
.footer a {
  color: var(--white);
}

.footer a {
  font-weight: 900;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 600ms ease, transform 600ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 1080px) {
  .nav {
    flex-wrap: wrap;
  }

  .nav__toggle {
    display: flex;
    margin-left: auto;
  }

  .nav__links {
    order: 3;
    display: none;
    flex-basis: 100%;
    justify-content: flex-start;
    flex-wrap: wrap;
    padding-top: 12px;
  }

  .nav__links.is-open {
    display: flex;
  }

  .nav__actions {
    margin-left: auto;
  }

  .hero,
  .story-grid,
  .lab-grid,
  .proof-grid,
  .connect-grid,
  .route-grid,
  .method-proof,
  .topic-hero__grid,
  .source-band,
  .not-found__grid {
    grid-template-columns: 1fr;
  }

  .hero__visual {
    min-height: 560px;
  }

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

  .path-grid,
  .method-grid,
  .latest-grid,
  .quote-grid,
  .topic-family-grid {
    grid-template-columns: 1fr;
  }

  .video-card--mission {
    grid-column: auto;
  }

  .path-card--feature {
    grid-column: auto;
    grid-template-columns: 1fr;
  }

  .path-card--feature img {
    height: 320px;
  }

  .topic-item {
    grid-template-columns: 1fr;
  }

  .topic-item img {
    height: auto;
    min-height: 0;
    aspect-ratio: 16 / 9;
  }
}

@media (max-width: 720px) {
  .nav {
    min-height: 66px;
    padding-inline: 14px;
  }

  .nav__brand {
    order: 0;
  }

  .nav__toggle {
    order: 1;
    margin-left: auto;
  }

  .nav__actions {
    order: 2;
    width: 100%;
    margin-left: 0;
    justify-content: flex-start;
  }

  .nav__actions .btn--small {
    display: none;
  }

  .nav__links {
    order: 3;
  }

  .hero {
    padding-inline: 16px;
  }

  .hero__copy,
  .hero__visual {
    width: 100%;
    max-width: calc(100vw - 32px);
  }

  .hero h1 {
    font-size: clamp(36px, 10vw, 42px);
    line-height: 1.02;
    overflow-wrap: break-word;
  }

  .hero__lead {
    font-size: 16px;
  }

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

  .hero__actions .btn,
  .lab-controls .btn,
  .topic-hero__actions .btn {
    width: 100%;
    max-width: calc(100vw - 32px);
  }

  .hero__proof,
  .quick,
  .pricing-grid,
  .metric-board {
    grid-template-columns: 1fr;
  }

  .hero__visual {
    min-height: 480px;
  }

  .hero-scene {
    inset: 54px 0 44px 0;
  }

  .live-panel {
    left: 10px;
  }

  .sensei-card {
    right: 10px;
    bottom: 0;
  }

  .section {
    padding-inline: 16px;
  }

  .connect-list a {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .footer {
    flex-direction: column;
  }

  .topic-hero {
    padding-inline: 16px;
  }

  .topic-hero h1 {
    font-size: clamp(36px, 10vw, 44px);
    line-height: 1.02;
  }

  .not-found {
    padding-inline: 16px;
  }

  .not-found h1 {
    font-size: clamp(42px, 12vw, 54px);
    line-height: 1.02;
  }

  .topic-proof div,
  .topic-family-card,
  .topic-item__body,
  .source-band {
    padding: 20px;
  }
}