@import "./tokens.css";

:root {
  color-scheme: light;
  --paper: var(--bg);
  --paper-deep: var(--surface-3);
  --ink: var(--text);
  --ink-soft: var(--text-2);
  --line: var(--border);
  --line-strong: var(--border-strong);
  --amber: var(--st-learning);
  --amber-soft: var(--st-learning-soft);
  --blue: var(--st-new);
  --blue-soft: var(--st-new-soft);
  --serif: var(--font-content);
  --sans: var(--font-ui);
  --mono: var(--font-mono);
  --shell: min(1320px, calc(100% - 48px));
  --shadow: var(--shadow-lift);
  --local-bg: color-mix(in oklch, var(--text) 88%, var(--st-new));
  --local-line: color-mix(in oklch, var(--st-new) 36%, var(--surface));
  --local-text: color-mix(in oklch, var(--surface) 86%, var(--st-new));
}

html[data-theme="dark"] {
  color-scheme: dark;
  --paper: oklch(0.17 0.018 250);
  --paper-deep: oklch(0.215 0.02 250);
  --line: color-mix(in oklch, var(--border) 72%, var(--st-new));
  --line-strong: color-mix(in oklch, var(--border-strong) 68%, var(--st-new));
  --amber: var(--st-new);
  --amber-soft: var(--st-new-soft);
  --blue: color-mix(in oklch, var(--st-new) 74%, var(--accent));
  --blue-soft: color-mix(in oklch, var(--st-new-soft) 82%, var(--surface));
  --local-bg: color-mix(in oklch, var(--bg) 84%, var(--st-new));
  --local-line: color-mix(in oklch, var(--st-new) 34%, var(--border));
  --local-text: color-mix(in oklch, var(--text) 82%, var(--st-new));
}

html[data-theme="dark"] .button--ink {
  border-color: var(--blue);
  background: var(--blue);
  color: oklch(0.18 0.018 250);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
  overflow-x: clip;
  background: var(--paper);
}

body {
  margin: 0;
  overflow-x: clip;
  color: var(--ink);
  background:
    linear-gradient(90deg, transparent calc(50% - .5px), color-mix(in oklch, var(--text) 5%, transparent) 50%, transparent calc(50% + .5px)),
    var(--paper);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

body.is-intro-locked {
  overflow: hidden;
  overscroll-behavior: none;
  touch-action: none;
}

body::before {
  position: fixed;
  z-index: 99;
  inset: 0 0 auto;
  height: 3px;
  content: "";
  background: linear-gradient(90deg, var(--amber) 0 72%, var(--blue) 72%);
}

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

a {
  color: inherit;
  text-underline-offset: .2em;
}

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

:focus-visible {
  outline: 3px solid color-mix(in oklch, var(--focus) 55%, transparent);
  outline-offset: 4px;
}

h1,
h2,
h3,
p,
figure {
  margin-top: 0;
}

h1,
h2,
h3 {
  font-family: var(--serif);
  font-weight: 500;
  letter-spacing: -.035em;
  line-height: 1.08;
  text-wrap: balance;
}

h1 {
  margin-bottom: 28px;
  font-size: clamp(3.2rem, 4.5vw, 4.65rem);
}

h2 {
  margin-bottom: 20px;
  font-size: clamp(2.4rem, 4.7vw, 4.6rem);
}

h3 {
  margin-bottom: 22px;
  font-size: clamp(2rem, 3.5vw, 3.3rem);
}

h1 em {
  color: var(--amber);
  font-style: italic;
  font-weight: 400;
}

.shell {
  width: var(--shell);
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  z-index: 200;
  top: 12px;
  left: 12px;
  padding: 10px 16px;
  border-radius: 6px;
  background: var(--ink);
  color: var(--accent-text);
  transform: translateY(-150%);
}

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

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  overflow: hidden !important;
  margin: -1px !important;
  padding: 0 !important;
  border: 0 !important;
  clip: rect(0 0 0 0) !important;
  clip-path: inset(50%) !important;
  white-space: nowrap !important;
}

.eyebrow,
.chapter-marker,
.margin-note,
.data-note {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .76rem;
  font-weight: 500;
  letter-spacing: .11em;
  text-transform: uppercase;
}

.eyebrow {
  margin-bottom: 22px;
}

/* ============================================================
   Brand intro + automatic app hero
   ============================================================ */

.brand-experience {
  position: relative;
  min-height: 100svh;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(circle at 50% 42%, color-mix(in oklch, var(--surface) 72%, transparent) 0 20%, transparent 58%),
    var(--paper);
}

.brand-viewport {
  position: relative;
  min-height: 100svh;
  overflow: clip;
  isolation: isolate;
}

.brand-viewport::before,
.brand-viewport::after {
  display: none;
}

.brand-intro-canvas,
.app-hero {
  position: absolute;
  inset: 0;
  min-height: 100svh;
}

.brand-intro-canvas {
  z-index: 2;
  pointer-events: none;
}

.brand-wordmark {
  position: absolute;
  top: var(--brand-wordmark-center, 44svh);
  left: 50%;
  /* Reserve real vertical room for the quill while keeping the wordmark
     composition stable across laptop and phone heights. */
  width: min(88vw, 1140px, calc((100svh - 150px) * 1.76));
  color: var(--ink);
  transform: translate(-50%, -50%);
  transform-origin: center;
}

html.debug-intro .brand-wordmark {
  width: min(92vw, 1240px, calc((100svh - 130px) * 1.76));
}

.brand-wordmark-svg,
.brand-writing-quill svg,
.app-hero-mark svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

[data-wordmark-text-final],
[data-morph-host] {
  opacity: 0;
}

/* Flight translation and rigid pose live on separate SVG wrappers so the
   final DOMMatrix can land on the hero mark without CSS/SVG transform drift. */
[data-morph-host],
[data-morph-flight],
[data-morph-pose] {
  will-change: transform, opacity;
}

/* The barb layer sits inside a group that is pre-rotated onto the rachis, so
   scaling it on Y collapses every detached barb straight into the shaft. */
[data-morph-barbs] {
  transform-box: fill-box;
  transform-origin: 50% 50%;
  will-change: transform, opacity;
}

[data-morph-body],
[data-morph-counter] {
  will-change: d;
}

.brand-writing-quill {
  position: absolute;
  z-index: 3;
  top: 0;
  left: 0;
  width: 164px;
  color: var(--ink);
  opacity: 0;
  pointer-events: none;
  transform-origin: 0 0;
}

.quill-organic {
  position: relative;
  display: block;
  width: 100%;
  transform-origin: center;
}

.pen-tip-anchor {
  position: absolute;
  bottom: 1.6%;
  left: 2.13%;
  display: none;
  width: 9px;
  height: 9px;
  border: 2px solid #fff;
  border-radius: 50%;
  background: #d92d20;
  box-shadow: 0 0 0 2px #d92d20;
  transform: translate(-50%, 50%);
}

.handwriting-debug-paths {
  visibility: hidden;
  pointer-events: none;
}

.wordmark-reference,
.brand-debug-key {
  display: none;
}

html.debug-intro .handwriting-debug-paths {
  visibility: visible;
  stroke: #00b8d9;
  stroke-width: 2;
  vector-effect: non-scaling-stroke;
}

html.debug-intro .handwriting-debug-paths text {
  fill: #00b8d9;
  stroke: none;
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 600;
  paint-order: stroke;
}

html.debug-intro .wordmark-reference {
  display: block;
  opacity: .1;
}

html.debug-intro .pen-tip-anchor,
html.debug-intro .brand-debug-key {
  display: flex;
}

.brand-debug-key {
  position: fixed;
  z-index: 120;
  right: 18px;
  bottom: 18px;
  min-width: 230px;
  padding: 12px;
  border: 1px solid color-mix(in oklch, #00b8d9 58%, var(--line));
  border-radius: 8px;
  background: color-mix(in oklch, var(--surface) 92%, transparent);
  box-shadow: 0 10px 28px color-mix(in oklch, var(--ink) 12%, transparent);
  color: var(--ink);
  font-family: var(--mono);
  font-size: .66rem;
  gap: 5px;
  backdrop-filter: blur(12px);
}

.brand-debug-key strong {
  margin-bottom: 4px;
  color: #007f92;
  font-size: .72rem;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.brand-debug-key output {
  display: block;
}

.brand-debug-key button {
  margin-top: 7px;
  padding: 6px 8px;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  background: var(--paper);
  color: var(--ink);
  cursor: pointer;
  font: inherit;
}

.app-hero {
  z-index: 1;
  display: grid;
  align-content: center;
  justify-items: center;
  padding: clamp(92px, 12svh, 132px) 24px clamp(96px, 13svh, 140px);
  text-align: center;
}

.app-hero-mark {
  width: clamp(96px, 8.9vw, 128px);
  margin-bottom: clamp(18px, 2.5svh, 28px);
  color: var(--ink);
  opacity: 0;
}

.app-hero-copy {
  display: grid;
  justify-items: center;
}

.app-hero h1 {
  margin: 0 0 14px;
  font-size: clamp(3.8rem, 7.2vw, 6.7rem);
  letter-spacing: -.055em;
}

.app-hero-thesis,
.app-hero-support {
  margin: 0;
  font-family: var(--serif);
}

.app-hero-thesis {
  color: var(--ink);
  font-size: clamp(1.22rem, 2vw, 1.72rem);
}

.app-hero-support {
  margin-top: 2px;
  color: var(--ink-soft);
  font-size: clamp(1rem, 1.35vw, 1.18rem);
  font-style: italic;
}

.app-hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  justify-content: center;
  margin-top: clamp(24px, 4svh, 38px);
  gap: 10px;
}

.play-status {
  display: grid;
  min-height: 52px;
  padding: 8px 13px;
  border: 1px solid var(--line-strong);
  border-radius: 7px;
  background: color-mix(in oklch, var(--surface) 54%, transparent);
  color: var(--ink);
  grid-template-columns: auto auto;
  align-items: center;
  column-gap: 9px;
  text-align: left;
}

.play-status-icon {
  grid-row: 1 / span 2;
  font-size: 1rem;
  transform: rotate(-30deg);
}

.play-status > span:nth-child(2) {
  display: grid;
  line-height: 1.02;
}

.play-status small {
  color: var(--ink-soft);
  font-size: .55rem;
}

.play-status strong {
  font-size: .83rem;
  font-weight: 650;
}

.play-status em {
  grid-column: 1 / -1;
  margin-top: 4px;
  padding-top: 3px;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .5rem;
  font-style: normal;
  letter-spacing: .08em;
  text-align: center;
  text-transform: uppercase;
}

.app-hero-version {
  margin: 17px 0 0;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .65rem;
  letter-spacing: .07em;
}

.scroll-hint {
  position: absolute;
  z-index: 5;
  bottom: clamp(22px, 4svh, 42px);
  left: 50%;
  display: grid;
  justify-items: center;
  width: 48px;
  height: 54px;
  padding: 7px;
  border: 0;
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
  opacity: 0;
  transform: translateX(-50%);
}

.scroll-hint i {
  display: block;
  width: 22px;
  height: 22px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  animation: scroll-hint-arrow 2.15s ease-in-out infinite;
  transform: rotate(45deg);
}

.scroll-hint--hero {
  width: 58px;
  height: 64px;
}

.scroll-hint--hero i {
  width: 28px;
  height: 28px;
}

@keyframes scroll-hint-arrow {
  0%, 100% { opacity: .48; transform: translateY(0) rotate(45deg); }
  50% { opacity: 1; transform: translateY(8px) rotate(45deg); }
}

html:not(.js) .brand-intro-canvas,
html:not(.js) .scroll-hint {
  display: none;
}

html:not(.js) .app-hero-mark,
html:not(.js) [data-hero-reveal],
html.brand-motion-unavailable .app-hero-mark,
html.brand-motion-unavailable [data-hero-reveal] {
  opacity: 1;
}

html.brand-motion-unavailable .site-header {
  opacity: 1;
  pointer-events: auto;
  transform: none;
  visibility: visible;
}

html.brand-motion-unavailable .brand-intro-canvas {
  display: none;
}

html.brand-motion-pending .site-header,
html.brand-motion-initialized:not(.brand-motion-unavailable) .site-header {
  position: fixed;
  right: 0;
  left: 0;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-12px);
  visibility: hidden;
}

html.js body.brand-hero-ready .site-header,
html.js body.brand-motion-bypassed .site-header {
  pointer-events: auto;
}

html.brand-motion-pending [data-hero-reveal],
html.brand-motion-initialized:not(.brand-motion-unavailable) [data-hero-reveal] {
  opacity: 0;
}

html.js body.brand-motion-bypassed .app-hero-mark,
html.js body.brand-motion-bypassed [data-hero-reveal] {
  opacity: 1;
}

html.js body.brand-motion-bypassed .brand-intro-canvas {
  display: none;
}

html.js body.brand-motion-active:not(.brand-hero-ready):not(.brand-motion-bypassed) .app-hero-actions,
html.js body.brand-motion-active:not(.brand-hero-ready):not(.brand-motion-bypassed) .scroll-hint--hero {
  pointer-events: none;
}

.site-header {
  position: sticky;
  z-index: 80;
  top: 0;
  border-bottom: 1px solid color-mix(in oklch, var(--border-strong) 68%, transparent);
  background: color-mix(in oklch, var(--bg) 88%, transparent);
  backdrop-filter: blur(18px);
}

.nav-shell {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  min-height: 76px;
  gap: 28px;
}

.brand,
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  width: max-content;
  text-decoration: none;
}

.brand span,
.footer-brand span {
  font-family: var(--serif);
  font-size: 1.45rem;
  font-weight: 600;
  letter-spacing: -.03em;
}

.brand small,
.footer-brand small {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .62rem;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-self: center;
  gap: 28px;
  color: var(--ink-soft);
  font-size: .88rem;
}

.site-nav a {
  text-decoration: none;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  justify-self: end;
  gap: 18px;
}

.theme-toggle {
  display: grid;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: color-mix(in oklch, var(--surface) 74%, transparent);
  color: var(--ink-soft);
  cursor: pointer;
  font-family: var(--mono);
  font-size: .86rem;
  place-items: center;
}

html[data-theme="dark"] .theme-toggle {
  border-color: color-mix(in oklch, var(--blue) 56%, var(--line));
  color: var(--blue);
}

.language-switcher {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .68rem;
}

.language-switcher button {
  padding: 5px 3px;
  border: 0;
  background: transparent;
  color: inherit;
  cursor: pointer;
  font: inherit;
}

.language-switcher button[aria-pressed="true"] {
  color: var(--ink);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--amber);
  text-decoration-thickness: 2px;
  text-underline-offset: 5px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 12px 22px;
  border: 1px solid var(--ink);
  border-radius: 7px;
  font-size: .93rem;
  font-weight: 650;
  line-height: 1.2;
  text-decoration: none;
  transition: transform 180ms ease, box-shadow 180ms ease, background-color 180ms ease;
}

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

.button--ink {
  background: var(--ink);
  box-shadow: var(--shadow-2);
  color: var(--surface);
}

.button--paper {
  border-color: var(--line-strong);
  background: color-mix(in oklch, var(--surface) 60%, transparent);
}

.button--small {
  min-height: 40px;
  padding: 9px 16px;
  font-size: .82rem;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
  align-items: center;
  padding-block: clamp(34px, 4.5vw, 58px);
  gap: clamp(40px, 5vw, 72px);
}

.hero-copy {
  position: relative;
  z-index: 2;
  min-width: 0;
}

.hero h1,
.hero h2 {
  margin-bottom: 24px;
  font-size: clamp(2.15rem, 3.1vw, 2.9rem);
  white-space: nowrap;
}

html[lang="en"] .hero-title-line + .hero-title-line::before {
  content: " ";
}

.hero-lede {
  max-width: 660px;
  margin-bottom: 20px;
  color: var(--ink-soft);
  font-size: clamp(1.05rem, 1.5vw, 1.25rem);
}

.english-thesis {
  max-width: 600px;
  margin-bottom: 30px;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: 1.08rem;
  font-style: italic;
  line-height: 1.45;
}

html[lang="en"] .english-thesis {
  display: none;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-actions .button span {
  margin-left: 8px;
  color: color-mix(in oklch, var(--accent-text) 76%, var(--text-3));
  font-size: .72rem;
  font-weight: 500;
}

.data-note {
  margin: 18px 0 0 4px;
  letter-spacing: .04em;
  text-transform: none;
}

.data-note::before {
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 8px;
  border: 1px solid var(--amber);
  border-radius: 50%;
  content: "";
}

.hero-visual {
  position: relative;
  min-width: 0;
  margin: 0;
}

.hero-visual::before {
  content: none;
}

.hero-visual img,
.frame img,
.bilingual-visual img,
.story-shot img {
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 5;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  box-shadow: var(--shadow);
  object-fit: contain;
}

.hero-visual img {
  transform: none;
}

.hero-visual figcaption,
.bilingual-visual figcaption,
.phone-stage figcaption {
  display: flex;
  justify-content: space-between;
  margin-top: 14px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .7rem;
}

.hero-visual figcaption span {
  margin-right: 6px;
  padding: 1px 5px;
  background: var(--amber-soft);
  color: var(--accent);
}

.hero-phone-visual {
  display: grid;
  align-content: center;
}

.hero-phone-visual .phone-pair {
  height: auto;
  min-height: 390px;
}

.hero-phone-visual .phone-frame {
  width: min(38%, 230px);
}

.hero-phone-visual .phone-frame img {
  border: 0;
  box-shadow: none;
}

.margin-note {
  position: absolute;
  top: 18%;
  right: calc(100% + 18px);
  writing-mode: vertical-rl;
}

.principles {
  border-block: 1px solid var(--line);
  background: color-mix(in oklch, var(--surface) 58%, transparent);
}

.capability-index {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  padding-block: 14px;
  gap: 8px;
}

.capability-index a {
  position: relative;
  display: grid;
  min-height: 92px;
  padding: 13px 34px 13px 14px;
  border: 1px solid transparent;
  background: color-mix(in oklch, var(--paper) 52%, transparent);
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: 9px;
  text-decoration: none;
  transition: border-color 180ms ease, background-color 180ms ease, transform 180ms ease;
}

.capability-index a:hover,
.capability-index a:focus-visible {
  border-color: var(--line-strong);
  background: var(--surface);
  transform: translateY(-2px);
}

.capability-index > a > span {
  padding-top: 3px;
  color: var(--accent);
  font-family: var(--mono);
  font-size: .58rem;
}

.capability-index p {
  display: grid;
  margin: 0;
  line-height: 1.3;
}

.capability-index strong {
  font-size: .82rem;
  font-weight: 650;
}

.capability-index small {
  margin-top: 7px;
  color: var(--ink-soft);
  font-size: .64rem;
  line-height: 1.45;
}

.capability-index i {
  position: absolute;
  right: 12px;
  bottom: 12px;
  color: var(--line-strong);
  font-family: var(--mono);
  font-size: .72rem;
  font-style: normal;
}

.story {
  padding-block: clamp(76px, 8vw, 112px);
}

.section-intro {
  max-width: 900px;
  margin-bottom: 52px;
}

.section-intro > p:last-child {
  max-width: 680px;
  color: var(--ink-soft);
  font-size: 1.07rem;
}

.story > .section-intro {
  max-width: none;
}

#story-title {
  font-size: clamp(2.25rem, 4.1vw, 3.35rem);
  white-space: nowrap;
}

.learning-thread {
  display: grid;
  grid-template-columns: minmax(310px, .76fr) minmax(0, 1.24fr);
  align-items: start;
  gap: clamp(52px, 7vw, 104px);
}

.story-steps {
  position: relative;
  padding-bottom: 28svh;
}

.story-steps::before {
  position: absolute;
  top: 12%;
  bottom: 12%;
  left: 5px;
  width: 1px;
  background: linear-gradient(var(--amber), var(--line) 47%, var(--blue));
  content: "";
}

.chapter {
  position: relative;
  display: flex;
  min-height: min(74svh, 760px);
  padding: clamp(68px, 8vw, 108px) 0 clamp(68px, 8vw, 108px) 42px;
  flex-direction: column;
  justify-content: center;
  opacity: .38;
  transform: translateY(18px);
  transition: opacity 420ms ease, transform 520ms cubic-bezier(.2, .7, .2, 1);
}

.chapter::after {
  position: absolute;
  z-index: 2;
  top: 50%;
  left: 0;
  width: 11px;
  height: 11px;
  border: 3px solid var(--paper);
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 1px var(--amber);
  content: "";
  transform: translate(-50%, -50%);
}

.chapter--reverse .chapter-copy {
  order: initial;
}

.chapter.is-active {
  opacity: 1;
  transform: translateY(0);
}

.chapter.is-active::after {
  background: var(--blue);
  box-shadow: 0 0 0 1px var(--blue), 0 0 0 7px color-mix(in oklch, var(--blue-soft) 70%, transparent);
}

.chapter-copy > p:not(.chapter-marker) {
  color: var(--ink-soft);
}

.chapter-details > p {
  color: var(--ink-soft);
}

.device-routes {
  display: grid;
  margin-top: 24px;
  border-block: 1px solid var(--line);
  grid-template-columns: 1fr 1fr;
}

.device-routes p {
  display: grid;
  margin: 0;
  padding: 15px 14px 15px 0;
  gap: 3px;
}

.device-routes p + p {
  padding-left: 16px;
  border-left: 1px solid var(--line);
}

.device-routes strong {
  color: var(--ink);
  font-family: var(--serif);
  font-size: .9rem;
}

.device-routes span,
.context-note {
  color: var(--ink-soft);
  font-size: .69rem;
  line-height: 1.6;
}

.chapter-copy .context-note {
  margin-top: 13px;
}

.chapter-details .context-note {
  margin-top: 13px;
}

.understand-flow {
  display: grid;
  margin-top: 22px;
  border-block: 1px solid var(--line);
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.understand-flow span {
  display: flex;
  align-items: center;
  padding: 11px 9px 11px 0;
  color: var(--ink-soft);
  font-size: .72rem;
  gap: 8px;
}

.understand-flow span:nth-child(even) {
  padding-left: 12px;
  border-left: 1px solid var(--line);
}

.understand-flow span:nth-child(n + 3) {
  border-top: 1px solid var(--line);
}

.understand-flow strong {
  color: var(--accent);
  font-family: var(--mono);
  font-size: .58rem;
  font-weight: 500;
}

.chapter-copy .followup-note {
  display: grid;
  margin: 24px 0 0;
  padding: 14px 16px;
  border-left: 2px solid var(--blue);
  background: var(--blue-soft);
  gap: 3px;
}

.chapter-details .followup-note {
  display: grid;
  margin: 24px 0 0;
  padding: 14px 16px;
  border-left: 2px solid var(--blue);
  background: var(--blue-soft);
  gap: 3px;
}

.followup-note strong {
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1rem;
}

.followup-note span {
  color: var(--ink-soft);
  font-size: .78rem;
}

.chapter-marker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}

.chapter-marker span {
  display: grid;
  width: 31px;
  height: 31px;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  color: var(--ink);
  letter-spacing: 0;
}

.story-stage {
  position: sticky;
  top: calc(50svh + 38px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-self: start;
  overflow: hidden;
  margin: clamp(180px, 26svh, 240px) 0 0;
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  background: var(--surface);
  box-shadow: var(--shadow-lift);
  transform: translateY(-50%);
}

.story-stage[data-active-story="capture"],
.story-stage[data-active-story="understand"],
.story-stage[data-active-story="recommend"],
.story-stage[data-active-story="remember"] {
  overflow: visible;
  border-color: transparent;
  background: transparent;
  box-shadow: none;
}

.story-stage[data-active-story="capture"] .story-stage-bar,
.story-stage[data-active-story="understand"] .story-stage-bar,
.story-stage[data-active-story="recommend"] .story-stage-bar,
.story-stage[data-active-story="remember"] .story-stage-bar {
  display: none;
}

.story-stage-bar {
  display: flex;
  grid-column: 1;
  grid-row: 1;
  align-items: center;
  min-height: 38px;
  padding: 0 14px;
  border-bottom: 1px solid var(--line);
  gap: 6px;
}

.story-stage-bar span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--line-strong);
}

.story-stage-bar strong {
  margin-left: auto;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .6rem;
  font-weight: 500;
  letter-spacing: .06em;
  text-transform: uppercase;
}

.story-shot {
  position: relative;
  grid-column: 1;
  grid-row: 2;
  margin: 0;
  aspect-ratio: 8 / 5;
  pointer-events: none;
  opacity: 0;
  transform: translateY(12px) scale(.985);
  transition: opacity 480ms ease, transform 620ms cubic-bezier(.2, .7, .2, 1);
}

.story-shot:not(.story-shot--phone) {
  overflow: hidden;
}

.story-shot.is-active {
  pointer-events: auto;
  opacity: 1;
  transform: translateY(0) scale(1);
}

.story-shot img {
  border: 0;
  border-radius: 0;
  box-shadow: none;
}

.story-shot:not(.story-shot--phone) > img {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 165%;
  max-width: none;
  transform: translate(-50%, -50%);
}

.story-shot[data-story-shot="capture"] > img {
  transform: translate(-50%, -48%);
}

.story-shot[data-story-shot="understand"] > img {
  transform: translate(-50%, -65%);
}

.story-shot[data-story-shot="recommend"] > img {
  transform: translate(-50%, -46%);
}

.story-shot--phone {
  display: grid;
  place-items: center;
  background: transparent;
}

.story-shot--phone .phone-frame {
  width: min(31%, 190px);
  padding: 6px;
  border-radius: 21px;
}

.story-shot--phone .phone-frame img {
  height: auto;
  aspect-ratio: auto;
  border-radius: 16px;
  object-fit: contain;
}

.story-shot--phones {
  display: grid;
  overflow: visible;
  place-items: center;
}

.phone-pair {
  display: flex;
  width: 100%;
  height: 100%;
  align-items: center;
  justify-content: center;
  gap: clamp(14px, 2vw, 24px);
}

.phone-pair .phone-frame {
  width: min(36%, 230px);
  max-width: none;
  margin: 0;
  padding: 6px;
  border-radius: 22px;
  transition: opacity 420ms ease, transform 520ms cubic-bezier(.2, .7, .2, 1);
}

.phone-pair .phone-frame img {
  display: block;
  height: auto;
  aspect-ratio: auto;
  border-radius: 16px;
  object-fit: contain;
}

.phone-pair .phone-frame:nth-child(2) {
  opacity: .52;
  transform: translateY(14px) scale(.92);
}

.phone-pair[data-focus-phone="detail"] .phone-frame:first-child {
  opacity: .52;
  transform: translateY(14px) scale(.92);
}

.phone-pair[data-focus-phone="detail"] .phone-frame:nth-child(2) {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.phone-pair--review .phone-frame:nth-child(2) {
  opacity: .9;
  transform: translateY(10px) scale(.96);
}

.phone-frame--ui {
  aspect-ratio: 9 / 16;
  overflow: hidden;
  padding: 6px;
}

.product-phone-ui {
  display: flex;
  height: 100%;
  overflow: hidden;
  padding: 18px 14px 13px;
  border-radius: 16px;
  background:
    linear-gradient(180deg, color-mix(in oklch, var(--blue-soft) 36%, transparent), transparent 34%),
    var(--paper);
  color: var(--ink);
  flex-direction: column;
  font-family: var(--sans);
  font-size: clamp(.46rem, .68vw, .62rem);
  line-height: 1.38;
}

.phone-ui-top {
  display: flex;
  align-items: baseline;
  margin-bottom: 12px;
  padding-bottom: 9px;
  border-bottom: 1px solid var(--line);
  justify-content: space-between;
  gap: 8px;
}

.phone-ui-top span {
  font-family: var(--serif);
  font-size: 1.45em;
  font-weight: 650;
}

.phone-ui-top small,
.phone-ui-foot {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .8em;
}

.domain-answer {
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface);
}

.domain-answer small {
  color: var(--blue);
  font-family: var(--mono);
}

.domain-answer p {
  margin: 5px 0 0;
}

.chat-bubble {
  max-width: 88%;
  margin-top: 10px;
  padding: 8px 9px;
  border-radius: 9px;
}

.chat-bubble--user {
  align-self: flex-end;
  background: var(--ink);
  color: var(--surface);
}

.chat-bubble--ai {
  align-self: flex-start;
  border: 1px solid var(--line);
  background: var(--surface);
}

.chat-compose {
  display: flex;
  align-items: center;
  min-height: 34px;
  margin-top: auto;
  padding: 6px 7px 6px 9px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--ink-soft);
  justify-content: space-between;
}

.chat-compose i {
  display: grid;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--blue);
  color: var(--surface);
  font-style: normal;
  place-items: center;
}

.phone-ui-meta {
  display: flex;
  margin-top: 8px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .78em;
  justify-content: space-between;
}

.mini-search {
  margin-bottom: 10px;
  padding: 8px 9px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink-soft);
}

.library-word {
  display: grid;
  margin-bottom: 8px;
  padding: 9px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.library-word strong,
.recommend-card strong {
  font-family: var(--serif);
  font-size: 1.15em;
}

.library-word small,
.recommend-card small,
.recommend-card span {
  color: var(--ink-soft);
  font-size: .82em;
}

.phone-ui-foot {
  margin-top: auto;
  padding-top: 9px;
  border-top: 1px solid var(--line);
  text-align: center;
}

.recommend-basis {
  margin: -4px 0 10px;
  color: var(--ink-soft);
  font-size: .86em;
}

.recommend-card {
  position: relative;
  display: grid;
  margin-bottom: 9px;
  padding: 9px 42px 9px 9px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface);
  gap: 2px;
}

.recommend-card button {
  position: absolute;
  right: 7px;
  bottom: 8px;
  padding: 4px 5px;
  border: 1px solid var(--line-strong);
  border-radius: 5px;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: .78em;
}

.recommend-refresh {
  align-self: flex-start;
  margin-top: 1px;
  padding: 5px 9px;
  border-radius: 5px;
  background: var(--ink);
  color: var(--surface);
  font-size: .82em;
}

.review-tabs {
  display: grid;
  padding: 4px;
  border-radius: 8px;
  background: var(--paper-deep);
  grid-template-columns: repeat(4, 1fr);
  text-align: center;
}

.review-tabs span,
.review-tabs strong {
  padding: 5px 2px;
  font-size: .76em;
  font-weight: 500;
}

.review-tabs strong {
  border-radius: 5px;
  background: var(--surface);
  box-shadow: var(--shadow-1);
  color: var(--ink);
}

.sound-pulse {
  position: relative;
  display: grid;
  width: 72px;
  height: 72px;
  margin: 30px auto 12px;
  border: 1px solid var(--blue);
  border-radius: 50%;
  background: color-mix(in oklch, var(--blue-soft) 72%, var(--surface));
  color: var(--blue);
  place-items: center;
}

.sound-pulse::before,
.sound-pulse::after {
  position: absolute;
  border: 1px solid color-mix(in oklch, var(--blue) 45%, transparent);
  border-radius: 50%;
  content: "";
}

.sound-pulse::before {
  inset: 8px;
}

.sound-pulse::after {
  inset: 17px;
}

.sound-pulse i {
  position: relative;
  z-index: 1;
  font-style: normal;
}

.sound-state {
  margin: 0 0 19px;
  color: var(--ink-soft);
  font-size: .85em;
  text-align: center;
}

.phone-dictation-ui label {
  margin-bottom: 6px;
  font-weight: 650;
}

.dictation-input {
  padding: 10px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  color: var(--ink-soft);
  letter-spacing: .08em;
}

.dictation-submit {
  margin-top: 8px;
  padding: 8px;
  border-radius: 6px;
  background: var(--ink);
  color: var(--surface);
  font-weight: 650;
  text-align: center;
}

.phone-pair-shot {
  position: relative;
  margin-top: 34px;
  padding: 8px 0 24px;
}

.phone-pair-shot figcaption {
  margin-top: 12px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .66rem;
  text-align: center;
}

.story-shot figcaption {
  position: absolute;
  right: 14px;
  bottom: 12px;
  margin: 0;
  padding: 5px 8px;
  border: 1px solid color-mix(in oklch, var(--line-strong) 72%, transparent);
  border-radius: 4px;
  background: color-mix(in oklch, var(--surface) 88%, transparent);
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .62rem;
  backdrop-filter: blur(8px);
}

.story-shot-mobile {
  display: none;
  margin: 34px 0 0;
}

.frame {
  position: relative;
  margin: 0;
}

.frame figcaption {
  margin-top: 13px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .68rem;
  text-align: right;
}

.frame::after {
  position: absolute;
  z-index: -1;
  inset: 18px -18px -18px 18px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  content: "";
}

.chapter--reverse .frame::after {
  inset: 18px 18px -18px -18px;
}

.quiet-list {
  display: grid;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.quiet-list li {
  padding: 11px 0 11px 24px;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: .9rem;
}

.quiet-list li::before {
  position: absolute;
  margin-left: -22px;
  color: var(--amber);
  content: "↳";
}

.meaning-contrast {
  margin-top: 30px;
  border-block: 1px solid var(--line-strong);
}

.meaning-contrast > div {
  display: grid;
  grid-template-columns: minmax(126px, .75fr) minmax(84px, .58fr) 1.65fr;
  align-items: baseline;
  padding: 14px 0;
  gap: 10px;
}

.meaning-contrast > div + div {
  border-top: 1px solid var(--line);
}

.meaning-contrast strong {
  font-family: var(--serif);
  font-size: 1rem;
}

.meaning-contrast small {
  color: var(--blue);
  font-family: var(--mono);
  font-size: .65rem;
}

.meaning-contrast p {
  margin: 0;
  color: var(--ink-soft);
  font-size: .82rem;
}

.seed-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}

.seed-row span {
  padding: 7px 10px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .65rem;
}

.bilingual-section {
  padding-block: clamp(88px, 10vw, 132px);
  background:
    linear-gradient(115deg, color-mix(in oklch, var(--amber-soft) 45%, transparent), transparent 44%),
    linear-gradient(245deg, color-mix(in oklch, var(--blue-soft) 58%, transparent), transparent 45%),
    var(--surface);
  border-block: 1px solid var(--line);
}

.section-intro--center {
  max-width: 1100px;
  margin-inline: auto;
  text-align: center;
}

.bilingual-section h2 {
  font-size: clamp(2.3rem, 4.1vw, 3.35rem);
  white-space: nowrap;
}

.section-intro--center > p:last-child {
  margin-inline: auto;
}

.bilingual-visual {
  max-width: 1040px;
  margin: 0 auto;
}

.bilingual-visual figcaption {
  text-transform: uppercase;
}

.bilingual-visual figcaption span:first-child {
  color: var(--amber);
}

.bilingual-visual figcaption span:last-child {
  color: var(--blue);
}

.review-modes {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  margin-top: 38px;
  border-block: 1px solid var(--line-strong);
}

.review-modes div {
  padding: 18px 16px 18px 0;
}

.review-modes div:nth-child(even) {
  padding-left: 20px;
  border-left: 1px solid var(--line);
}

.review-modes div:nth-child(n + 3) {
  border-top: 1px solid var(--line);
}

.review-modes dt {
  font-family: var(--serif);
  font-size: 1.16rem;
  font-weight: 600;
}

.review-modes dd {
  margin: 2px 0 0;
  color: var(--ink-soft);
  font-size: .8rem;
}

.phone-stage {
  position: relative;
  margin: 0;
  padding: 46px 56px;
  background: var(--amber-soft);
  transform: none;
}

.phone-stage::before {
  position: absolute;
  inset: 20px;
  border: 1px solid color-mix(in oklch, var(--amber) 28%, transparent);
  content: "";
}

.phone-frame {
  position: relative;
  max-width: 340px;
  margin: 0 auto;
  padding: 9px;
  border-radius: 28px;
  background: var(--ink);
  box-shadow: var(--shadow-lift);
}

.phone-frame img {
  width: 100%;
  border-radius: 21px;
}

.phone-stage figcaption {
  position: relative;
  justify-content: center;
  margin-bottom: -26px;
  color: var(--accent);
}

.local-section {
  padding-block: clamp(108px, 14vw, 170px);
  border-block: 1px solid var(--local-line);
  background: var(--local-bg);
  color: var(--surface);
}

.local-section .eyebrow {
  color: var(--local-text);
}

.local-section h2 {
  color: var(--surface);
}

.local-section p {
  color: var(--local-text);
}

.local-grid {
  display: grid;
  grid-template-columns: .78fr 1.22fr;
  gap: clamp(70px, 12vw, 150px);
}

.boundary-card {
  border-top: 1px solid var(--local-line);
}

.boundary-card > div {
  display: grid;
  grid-template-columns: 40px 1fr;
  padding: 25px 0;
  border-bottom: 1px solid var(--local-line);
  gap: 20px;
}

.boundary-card span {
  color: var(--local-text);
  font-family: var(--mono);
  font-size: .72rem;
}

.boundary-card p {
  margin: 0;
  font-size: .9rem;
}

.boundary-card strong {
  color: var(--surface);
  font-family: var(--serif);
  font-size: 1.1rem;
}

.availability {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  padding-block: clamp(95px, 12vw, 140px);
  border-bottom: 1px solid var(--line);
  gap: 70px;
}

.availability > div {
  max-width: 760px;
}

.availability p:last-child {
  color: var(--ink-soft);
}

.faq {
  padding-block: clamp(105px, 14vw, 170px);
}

.faq .section-intro {
  margin-bottom: 55px;
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line-strong);
}

.faq details {
  border-bottom: 1px solid var(--line);
}

.faq details:nth-child(odd) {
  padding-right: 36px;
  border-right: 1px solid var(--line);
}

.faq details:nth-child(even) {
  padding-left: 36px;
}

.faq summary {
  padding: 24px 28px 24px 0;
  cursor: pointer;
  font-family: var(--serif);
  font-size: 1.24rem;
  font-weight: 600;
}

.faq details p {
  padding: 0 16px 24px 0;
  color: var(--ink-soft);
  font-size: .9rem;
}

.final-cta {
  border-block: 1px solid var(--line-strong);
  background: var(--surface);
}

.flow-cta {
  border-top-color: var(--line);
  background: color-mix(in oklch, var(--surface) 72%, var(--amber-soft));
}

.final-cta-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  padding-block: clamp(62px, 8vw, 90px);
  gap: 30px;
}

.final-cta h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.5rem);
}

.final-cta .eyebrow {
  margin-bottom: 8px;
}

.site-footer {
  padding-block: 48px;
  color: var(--ink-soft);
  font-size: .78rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: .7fr 1.3fr;
  align-items: start;
  gap: 40px;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.site-footer nav a {
  text-decoration: none;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 980px) {
  .brand-wordmark {
    width: min(90vw, 970px, calc((100svh - 140px) * 1.76));
  }

  .app-hero {
    padding-inline: 20px;
  }

  .nav-shell {
    grid-template-columns: 1fr auto;
  }

  .site-nav {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .hero-copy {
    max-width: 770px;
  }

  .hero h1,
  .hero h2,
  #story-title,
  .bilingual-section h2 {
    white-space: normal;
  }

  .hero-visual {
    max-width: 880px;
  }

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

  .margin-note {
    display: none;
  }

  .learning-thread {
    display: block;
  }

  .story-steps {
    max-width: 850px;
    margin-inline: auto;
    padding-bottom: 0;
  }

  .chapter {
    min-height: auto;
    padding: 54px 0 74px 42px;
    opacity: 1;
    transform: none;
  }

  .story-stage {
    display: none;
  }

  .story-shot-mobile {
    display: block;
  }

  .story-shot-mobile.phone-pair-shot {
    display: grid;
    min-height: 450px;
    overflow: visible;
    aspect-ratio: auto;
    place-items: center;
  }

  .story-shot-mobile:not(.phone-stage) {
    overflow: hidden;
    aspect-ratio: 8 / 5;
  }

  .story-shot-mobile:not(.phone-stage) > img {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 165%;
    max-width: none;
    transform: translate(-50%, -50%);
  }

  .story-shot-mobile[data-mobile-shot="understand"] > img {
    transform: translate(-50%, -65%);
  }

  .review-section,
  .local-grid {
    grid-template-columns: 1fr;
  }

  .phone-stage {
    max-width: 520px;
    justify-self: center;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .site-footer p {
    grid-column: 1 / -1;
  }
}

@media (max-width: 680px) {
  :root {
    --shell: min(100% - 30px, 1320px);
  }

  body {
    font-size: 16px;
  }

  .brand-viewport::before {
    background:
      linear-gradient(90deg, transparent calc(50% - .5px), color-mix(in oklch, var(--text) 5%, transparent) 50%, transparent calc(50% + .5px)),
      linear-gradient(180deg, transparent calc(42% - .5px), color-mix(in oklch, var(--text) 4%, transparent) 42%, transparent calc(42% + .5px));
  }

  .brand-viewport::after {
    top: 42%;
    width: 118vw;
  }

  .brand-wordmark {
    top: 42%;
    /* 84vw keeps the final flourish and a readable full quill inside a narrow
       viewport; it also matches the approved 75–85vw mobile intro range. */
    width: 84vw;
  }

  .brand-writing-quill {
    width: clamp(72px, 20vw, 104px);
  }

  .app-hero {
    padding: 82px 18px 92px;
  }

  .app-hero-mark {
    width: 96px;
    margin-bottom: 17px;
  }

  .app-hero h1 {
    margin-bottom: 11px;
    font-size: clamp(3.35rem, 18vw, 4.6rem);
  }

  .app-hero-thesis {
    max-width: 17em;
    font-size: 1.12rem;
    line-height: 1.35;
  }

  .app-hero-support {
    margin-top: 5px;
    font-size: .96rem;
  }

  .app-hero-actions {
    display: grid;
    width: min(100%, 318px);
    margin-top: 26px;
  }

  .app-hero-actions .button,
  .play-status {
    width: 100%;
  }

  .play-status {
    grid-template-columns: auto 1fr auto;
  }

  .play-status em {
    grid-row: 1 / span 2;
    grid-column: 3;
    margin: 0;
    padding: 0 0 0 10px;
    border-top: 0;
    border-left: 1px solid var(--line);
  }

  .app-hero-version {
    margin-top: 12px;
  }

  .scroll-hint {
    bottom: 14px;
  }

  h1 {
    font-size: clamp(2.85rem, 14vw, 4.5rem);
  }

  .nav-shell {
    min-height: 62px;
    gap: 8px;
  }

  .brand img {
    width: 27px;
    height: 27px;
  }

  .brand small {
    display: none;
  }

  .brand span {
    font-size: 1.16rem;
  }

  .nav-actions {
    gap: 7px;
  }

  .theme-toggle {
    width: 32px;
    height: 32px;
  }

  .language-switcher {
    font-size: .62rem;
  }

  .nav-actions .button {
    display: none;
  }

  .hero h1,
  .hero h2 {
    margin-bottom: 18px;
    font-size: clamp(2.15rem, 11vw, 2.75rem);
    white-space: normal;
    text-wrap: balance;
  }

  .hero-title-line {
    display: block;
  }

  html[lang="en"] .hero-title-line + .hero-title-line::before {
    content: none;
  }

  .hero {
    width: var(--shell);
    padding-block: 30px 46px;
    gap: 24px;
  }

  .hero-copy,
  .hero-visual {
    width: 100%;
    min-width: 0;
  }

  .hero-lede,
  .english-thesis {
    overflow-wrap: anywhere;
  }

  .hero .eyebrow {
    margin-bottom: 13px;
  }

  .hero-lede {
    margin-bottom: 20px;
    font-size: .98rem;
    line-height: 1.72;
  }

  .english-thesis {
    display: none;
  }

  .phone-pair {
    max-width: 100%;
  }

  .hero-phone-visual .phone-pair {
    min-height: 325px;
  }

  .hero-phone-visual .phone-frame {
    width: 44%;
  }

  .hero-visual::before {
    display: none;
  }

  .hero-visual img {
    transform: none;
  }

  .hero-actions {
    display: grid;
    grid-template-columns: 1.1fr .9fr;
  }

  .hero-actions .button {
    min-width: 0;
    padding-inline: 10px;
    font-size: .86rem;
  }

  .hero-actions .button span {
    display: none;
  }

  .data-note {
    margin-top: 14px;
    font-size: .68rem;
  }

  .principles {
    overflow: hidden;
  }

  .capability-index {
    display: flex;
    width: 100%;
    overflow-x: auto;
    margin-inline: 0;
    padding: 12px 15px 16px;
    gap: 9px;
    scroll-padding-inline: 15px;
    scroll-snap-type: x mandatory;
    scrollbar-width: none;
  }

  .capability-index::-webkit-scrollbar {
    display: none;
  }

  .capability-index a {
    min-height: 86px;
    padding: 12px 32px 12px 12px;
    flex: 0 0 min(76vw, 292px);
    scroll-snap-align: start;
  }

  .capability-index a:last-child {
    grid-column: auto;
  }

  .story {
    padding-block: 58px 64px;
  }

  .section-intro {
    margin-bottom: 34px;
  }

  #story-title {
    font-size: clamp(2.05rem, 10vw, 2.55rem);
    line-height: 1.14;
  }

  .story > .section-intro > p:last-child {
    font-size: .94rem;
  }

  .story-steps::before {
    display: none;
  }

  .chapter {
    display: block;
    padding: 48px 0 58px;
    border-top: 1px solid var(--line);
  }

  .chapter::after {
    display: none;
  }

  .chapter h3 {
    margin-bottom: 17px;
    font-size: clamp(2rem, 9vw, 2.42rem);
  }

  .chapter-marker {
    margin-bottom: 16px;
  }

  .chapter-copy > p:not(.chapter-marker) {
    font-size: .95rem;
  }

  .chapter-details {
    margin-top: 25px;
  }

  .story-shot-mobile.phone-pair-shot {
    min-height: 355px;
    margin: 27px -6px 0;
    padding: 0;
  }

  .story-shot-mobile .phone-pair .phone-frame {
    width: 44%;
  }

  .story-shot-mobile .product-phone-ui {
    padding: 14px 10px 10px;
    font-size: clamp(.43rem, 1.85vw, .5rem);
  }

  .story-shot-mobile:not(.phone-stage) {
    overflow: visible;
    aspect-ratio: auto;
  }

  .device-routes {
    grid-template-columns: 1fr;
  }

  .device-routes p {
    padding-right: 0;
  }

  .device-routes p + p {
    padding-left: 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .understand-flow {
    margin-top: 0;
  }

  .frame::after,
  .chapter--reverse .frame::after {
    inset: 10px -8px -10px 8px;
  }

  .meaning-contrast > div {
    grid-template-columns: 1fr auto;
  }

  .meaning-contrast p {
    grid-column: 1 / -1;
  }

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

  .review-modes div:nth-child(even) {
    padding-left: 14px;
    border-left: 1px solid var(--line);
  }

  .review-modes div:nth-child(n + 3) {
    border-top: 1px solid var(--line);
  }

  .bilingual-section {
    padding-block: 72px;
  }

  .bilingual-section h2 {
    font-size: clamp(2rem, 9.8vw, 2.45rem);
  }

  .bilingual-visual {
    overflow-x: auto;
    margin-inline: -15px;
    padding-inline: 15px;
    scrollbar-width: none;
  }

  .bilingual-visual::-webkit-scrollbar {
    display: none;
  }

  .bilingual-visual img {
    width: 680px;
    max-width: none;
  }

  .bilingual-visual figcaption {
    width: 680px;
  }

  .phone-stage {
    padding: 32px;
    transform: none;
  }

  .availability,
  .final-cta-inner,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .availability {
    align-items: start;
    gap: 28px;
  }

  .availability .button,
  .final-cta .button {
    width: 100%;
  }

  .faq-grid {
    grid-template-columns: 1fr;
  }

  .faq details:nth-child(odd),
  .faq details:nth-child(even) {
    padding-inline: 0;
    border-right: 0;
  }

  .final-cta-inner > img {
    display: none;
  }

  .footer-grid {
    gap: 26px;
  }

  .site-footer p {
    grid-column: auto;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation: none !important;
    transition-duration: .01ms !important;
  }
}

/* ============================================================
   Landing product narrative (A–U content polish)
   ============================================================ */

.layout-full {
  width: 100%;
}

.layout-wide {
  width: min(1680px, calc(100% - 80px));
  margin-inline: auto;
}

.layout-reading {
  width: min(860px, calc(100% - 48px));
  margin-inline: auto;
}

.narrative-bridge {
  display: grid;
  min-height: min(62svh, 680px);
  place-content: center;
  padding-block: clamp(72px, 8vw, 118px);
  text-align: center;
}

.narrative-bridge h2 {
  max-width: 760px;
  margin-inline: auto;
}

.bridge-lede {
  max-width: 640px;
  margin: 0 auto 48px;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  line-height: 1.55;
}

.bridge-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  max-width: 720px;
  margin: 0 auto;
  padding: 0;
  list-style: none;
}

.bridge-steps li {
  position: relative;
  display: grid;
  gap: 8px;
  padding: 24px 18px;
  border-top: 1px solid var(--line-strong);
}

.bridge-steps li:not(:last-child)::after {
  position: absolute;
  top: -3px;
  right: -3px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  content: "";
  background: var(--amber);
}

.bridge-steps span,
.how-step-jump span,
.early-form-heading > span {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .68rem;
  letter-spacing: .12em;
}

.bridge-steps strong {
  font-family: var(--serif);
  font-size: 1.16rem;
  font-weight: 500;
}

.section-heading {
  max-width: 820px;
  margin-bottom: clamp(60px, 8vw, 120px);
}

.section-heading > p:last-child,
.feature-copy > p:not(.eyebrow),
.trust-copy > p,
.early-copy > p {
  max-width: 680px;
  color: var(--ink-soft);
  font-size: clamp(1rem, 1.35vw, 1.14rem);
  line-height: 1.7;
}

.section-heading em {
  color: var(--amber);
  font-family: var(--serif);
}

.how-section {
  padding-block: 80px 160px;
}

.how-grid {
  display: grid;
  grid-template-columns: minmax(330px, .78fr) minmax(580px, 1.22fr);
  align-items: start;
  gap: clamp(48px, 7vw, 120px);
}

.how-steps {
  min-width: 0;
}

.how-step {
  display: flex;
  min-height: 72svh;
  flex-direction: column;
  justify-content: center;
  padding: clamp(48px, 7vw, 92px) 0;
  border-top: 1px solid var(--line);
  opacity: .5;
  transition: opacity var(--dur-2) var(--ease-out);
}

.how-step:last-child {
  border-bottom: 1px solid var(--line);
}

.how-step.is-active {
  opacity: 1;
}

.how-step-jump {
  display: flex;
  align-items: baseline;
  width: max-content;
  margin: 0 0 30px;
  padding: 0;
  border: 0;
  gap: 16px;
  color: inherit;
  background: transparent;
  cursor: pointer;
}

.how-step-jump b {
  font-family: var(--serif);
  font-size: 1.24rem;
  font-weight: 500;
}

.how-step-copy h3 {
  max-width: 570px;
  font-size: clamp(2.15rem, 3.8vw, 4rem);
}

.how-step-copy p {
  max-width: 560px;
  color: var(--ink-soft);
}

.how-stage {
  position: sticky;
  top: clamp(110px, 14svh, 160px);
  height: min(72svh, 760px);
}

.product-viewport,
.domain-demo,
.browser-viewport,
.language-viewport,
.early-form {
  border: 1px solid var(--line-strong);
  background: color-mix(in oklch, var(--surface) 88%, transparent);
  box-shadow: var(--shadow-2);
}

.product-viewport {
  position: relative;
  height: 100%;
  min-height: 580px;
  overflow: hidden;
  border-radius: var(--r-lg);
}

.viewport-toolbar {
  display: flex;
  align-items: center;
  height: 54px;
  padding-inline: 20px;
  border-bottom: 1px solid var(--line);
  gap: 10px;
  font-size: .82rem;
}

.viewport-toolbar strong {
  font-weight: 600;
}

.viewport-toolbar small {
  margin-left: auto;
  color: var(--ink-soft);
  font-family: var(--mono);
  text-transform: capitalize;
}

.viewport-mark {
  display: grid;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  place-content: center;
  background: var(--ink);
  color: var(--surface);
  font-family: var(--mono);
  font-size: .54rem;
}

.demo-scene {
  position: absolute;
  inset: 54px 0 0;
  display: grid;
  align-content: center;
  padding: clamp(28px, 4.2vw, 70px);
  visibility: hidden;
  opacity: 0;
}

.demo-scene.is-active {
  visibility: visible;
  opacity: 1;
}

.capture-sources,
.mini-domain,
.review-ratings,
.review-modes-compact,
.review-modes-inline,
.factor-list,
.domain-tabs,
.preset-questions,
.study-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.capture-sources span,
.mini-domain span,
.review-modes-compact span,
.review-modes-inline span,
.factor-list span {
  padding: 7px 11px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .67rem;
}

.capture-sources span.is-active,
.mini-domain span.is-active {
  border-color: var(--amber);
  background: var(--amber-soft);
  color: var(--ink);
}

.capture-window {
  margin: 28px 0 18px;
  padding: clamp(26px, 4vw, 48px);
  border: 1px solid var(--line);
  background: var(--surface-2);
}

.capture-window small,
.definition small,
.domain-explanation small,
.due-state small,
.next-review small {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .68rem;
  letter-spacing: .05em;
}

.capture-window p {
  margin: 24px 0 0;
  font-family: var(--serif);
  font-size: clamp(1.35rem, 2.2vw, 2rem);
  line-height: 1.45;
}

.capture-window mark {
  padding: 0 .12em;
  color: inherit;
  background: var(--amber-soft);
  box-shadow: inset 0 -2px var(--amber);
}

.capture-card {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  padding: 18px 20px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  background: var(--surface);
  box-shadow: var(--shadow-1);
}

.capture-card > span,
.capture-card > small {
  color: var(--ink-soft);
  font-size: .72rem;
}

.capture-card > strong {
  grid-row: 1 / 3;
  grid-column: 2;
  font-family: var(--serif);
  font-size: 2.2rem;
  font-weight: 500;
}

.capture-card > button {
  grid-column: 1 / -1;
  justify-self: start;
  margin-top: 14px;
  padding: 7px 12px;
  border: 0;
  border-radius: var(--r-sm);
  background: var(--ink);
  color: var(--surface);
}

.demo-scene--understand {
  grid-template-columns: minmax(0, 1fr) minmax(240px, .9fr);
  align-content: start;
  gap: 18px 28px;
}

.word-header,
.demo-scene--understand blockquote,
.definition,
.mini-domain {
  grid-column: 1 / -1;
}

.word-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.word-header div {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.word-header strong {
  font-family: var(--serif);
  font-size: clamp(2.5rem, 5vw, 4.6rem);
  font-weight: 500;
}

.word-header span,
.word-header small {
  color: var(--ink-soft);
  font-family: var(--mono);
}

.demo-scene--understand blockquote {
  margin: 0;
  padding: 15px 18px;
  border-left: 2px solid var(--amber);
  background: var(--surface-2);
  font-family: var(--serif);
  font-size: 1.05rem;
}

.definition,
.domain-explanation,
.mini-followup {
  padding: 18px;
  border: 1px solid var(--line);
  background: color-mix(in oklch, var(--surface-2) 74%, transparent);
}

.definition p,
.domain-explanation p,
.mini-followup p {
  margin: 8px 0 0;
}

.mini-followup span {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .68rem;
}

.demo-scene--remember {
  gap: 18px;
}

.due-state,
.next-review {
  display: flex;
  align-items: center;
  padding: 15px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  gap: 14px;
  background: var(--surface-2);
}

.due-state strong {
  font-family: var(--serif);
  font-size: 1.65rem;
  font-weight: 500;
}

.due-state span,
.next-review strong {
  margin-left: auto;
  font-size: .78rem;
}

.review-card {
  padding: clamp(25px, 4vw, 42px);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  text-align: center;
  background: var(--surface);
  box-shadow: var(--shadow-1);
}

.review-card > small {
  color: var(--ink-soft);
  font-family: var(--mono);
}

.review-card > p {
  margin: 22px auto 8px;
  color: var(--ink-soft);
}

.review-card > strong {
  display: block;
  margin-bottom: 24px;
  font-family: var(--serif);
  font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 500;
}

.review-ratings {
  justify-content: center;
}

.review-ratings span,
.review-ratings b {
  min-width: 72px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  font-size: .7rem;
  font-weight: 500;
}

.review-ratings b {
  font-weight: 500;
}

.review-ratings .is-selected {
  border-color: var(--st-mastered);
  background: var(--st-mastered-soft);
  box-shadow: 0 0 0 1px color-mix(in oklch, var(--st-mastered) 24%, transparent);
}

.shared-cell-flight {
  position: fixed;
  z-index: 80;
  display: block;
  margin: 0;
  padding: 0 .14em;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-sm);
  color: var(--ink);
  background: color-mix(in oklch, var(--surface) 94%, transparent);
  box-shadow: var(--shadow-1);
  font-family: var(--serif);
  font-weight: 500;
  line-height: 1.12;
  pointer-events: none;
  white-space: nowrap;
}

.how-mobile-demo {
  display: none;
}

.feature-section {
  display: grid;
  grid-template-columns: minmax(320px, .72fr) minmax(560px, 1.28fr);
  align-items: center;
  min-height: min(98svh, 980px);
  padding-block: clamp(100px, 12vw, 180px);
  gap: clamp(60px, 9vw, 150px);
  border-top: 1px solid var(--line);
}

.feature-section:nth-of-type(even) .feature-copy {
  order: 2;
}

.feature-copy h2 {
  max-width: 620px;
}

.factor-list {
  margin-top: 30px;
}

.recommend-map {
  position: relative;
  aspect-ratio: 760 / 460;
  min-width: 0;
  overflow: hidden;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: radial-gradient(circle at center, var(--amber-soft), transparent 46%);
}

.recommend-map svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
}

.recommend-lines path {
  fill: none;
  stroke: var(--line-strong);
  stroke-dasharray: 4 7;
  stroke-width: 1.5;
}

.map-node {
  position: absolute;
  display: grid;
  min-width: 86px;
  min-height: 46px;
  padding: 9px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  place-content: center;
  background: var(--surface);
  box-shadow: var(--shadow-1);
  font-family: var(--serif);
  text-align: center;
}

.map-node small {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .56rem;
}

.map-node--center {
  top: 50%;
  left: 50%;
  min-width: 142px;
  min-height: 86px;
  border-color: var(--amber);
  background: var(--amber-soft);
  transform: translate(-50%, -50%);
}

.map-node--cell { top: 11%; left: 8%; }
.map-node--organism { top: 43%; left: 7%; }
.map-node--sample { bottom: 10%; left: 8%; }
.map-node--membrane { top: 9%; right: 6%; }
.map-node--tissue { top: 43%; right: 4%; }
.map-node--nucleus { right: 7%; bottom: 8%; }

.js .recommend-map .map-node,
.js .recommend-map .recommend-lines path {
  opacity: 0;
}

.recommend-section.is-visible .map-node {
  opacity: 1;
  transition: opacity var(--dur-3) var(--ease-out), transform var(--dur-3) var(--ease-out);
}

.recommend-section.is-visible .recommend-lines path {
  opacity: 1;
  transition: opacity var(--dur-3) var(--ease-out) .18s;
}

.domain-demo {
  overflow: hidden;
  border-radius: var(--r-lg);
}

.domain-demo > header {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  padding: 28px 32px;
  border-bottom: 1px solid var(--line);
  gap: 38px;
}

.domain-demo > header div {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.domain-demo > header strong {
  font-family: var(--serif);
  font-size: 2.8rem;
  font-weight: 500;
}

.domain-demo > header span {
  color: var(--ink-soft);
  font-family: var(--mono);
}

.domain-demo > header p {
  margin: 0;
  padding-left: 24px;
  border-left: 1px solid var(--line);
  font-family: var(--serif);
}

.domain-tabs {
  padding: 20px 28px 0;
}

.domain-tabs button,
.preset-questions button,
.study-switch button {
  min-height: 38px;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  color: var(--ink-soft);
  background: transparent;
  cursor: pointer;
}

.domain-tabs button[aria-selected="true"],
.preset-questions button.is-active,
.study-switch button[aria-pressed="true"] {
  border-color: var(--amber);
  background: var(--amber-soft);
  color: var(--ink);
}

.domain-panel {
  min-height: 148px;
  margin: 20px 28px;
  padding: 28px;
  border-left: 2px solid var(--amber);
  background: var(--surface-2);
}

.domain-panel small,
.preset-title {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .68rem;
  letter-spacing: .06em;
  text-transform: uppercase;
}

.domain-panel p {
  margin: 12px 0 0;
  font-family: var(--serif);
  font-size: clamp(1.2rem, 2vw, 1.55rem);
}

.preset-followup {
  padding: 24px 28px 30px;
  border-top: 1px solid var(--line);
}

.preset-answer {
  margin-top: 16px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  background: color-mix(in oklch, var(--surface-2) 70%, transparent);
  font-size: .9rem;
}

.device-composition {
  position: relative;
  min-height: 590px;
}

.browser-viewport {
  position: absolute;
  top: 0;
  right: 8%;
  left: 0;
  overflow: hidden;
  border-radius: var(--r-md);
}

.browser-bar {
  display: flex;
  align-items: center;
  height: 46px;
  padding: 0 16px;
  border-bottom: 1px solid var(--line);
  gap: 7px;
}

.browser-bar i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--line-strong);
}

.browser-bar span {
  margin-left: 12px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .62rem;
}

.document-toggle {
  display: flex;
  position: absolute;
  top: 64px;
  right: 20px;
  border: 1px solid var(--line);
}

.document-toggle span {
  padding: 5px 8px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .58rem;
}

.document-toggle span.is-active,
.device-composition.is-pdf .document-toggle span:last-child {
  background: var(--ink);
  color: var(--surface);
}

.device-composition.is-pdf .document-toggle span:first-child {
  background: transparent;
  color: var(--ink-soft);
}

.browser-viewport article {
  min-height: 380px;
  padding: clamp(46px, 7vw, 86px);
  background: var(--surface-2);
  transition: transform var(--dur-3) var(--ease), background-color var(--dur-3) var(--ease);
}

.device-composition.is-pdf .browser-viewport article {
  background: var(--surface);
  transform: scale(.96);
}

.browser-viewport article small {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .65rem;
  letter-spacing: .09em;
}

.browser-viewport article h3 {
  max-width: 560px;
  margin: 22px 0;
  font-size: clamp(1.9rem, 3.3vw, 3.1rem);
}

.browser-viewport article p {
  max-width: 600px;
  font-family: var(--serif);
  font-size: 1.08rem;
}

.browser-viewport article mark {
  color: inherit;
  background: var(--amber-soft);
}

.selection-action {
  width: max-content;
  margin-top: 28px;
  padding: 8px 11px;
  border: 1px solid var(--line);
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .64rem;
}

.mini-mobile {
  position: absolute;
  right: 0;
  bottom: 0;
  display: grid;
  width: min(275px, 42%);
  aspect-ratio: .6;
  align-content: center;
  padding: 28px 22px;
  border: 1px solid var(--line-strong);
  border-radius: 32px;
  background: var(--surface);
  box-shadow: var(--shadow);
  text-align: center;
}

.mini-mobile small {
  color: var(--ink-soft);
  font-family: var(--mono);
}

.mini-mobile strong {
  margin: 32px 0 8px;
  font-family: var(--serif);
  font-size: 2.6rem;
  font-weight: 500;
}

.mini-mobile p {
  color: var(--ink-soft);
  font-size: .82rem;
}

.mini-mobile button {
  margin-top: 22px;
  padding: 9px;
  border: 1px solid var(--st-mastered);
  border-radius: var(--r-sm);
  background: var(--st-mastered-soft);
}

.continuity-line {
  position: absolute;
  bottom: 86px;
  left: 4%;
  display: flex;
  width: 58%;
  align-items: center;
  gap: 12px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .62rem;
}

.continuity-line i {
  height: 1px;
  flex: 1;
  background: var(--line-strong);
}

.memory-visual {
  position: relative;
  min-height: 430px;
}

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

.memory-grid,
.memory-curve,
.memory-rise {
  fill: none;
  stroke-linecap: round;
}

.memory-grid { stroke: var(--line); }
.memory-curve { stroke: var(--amber); stroke-width: 3; }
.memory-rise { stroke: var(--line-strong); stroke-dasharray: 4 6; }

.memory-point {
  position: absolute;
  display: grid;
  min-width: 145px;
  padding: 12px 14px;
  border-top: 1px solid var(--line-strong);
  background: color-mix(in oklch, var(--paper) 88%, transparent);
}

.memory-point span,
.memory-point small {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .6rem;
}

.memory-point strong {
  margin: 5px 0;
  font-family: var(--serif);
  font-size: 1.08rem;
  font-weight: 500;
}

.memory-point--capture { bottom: 0; left: 2%; }
.memory-point--review-one { top: 64%; left: 37%; }
.memory-point--review-two { right: 2%; bottom: 8%; }

.language-demo {
  max-width: 760px;
  margin-inline: auto;
  transition: color var(--dur-2) var(--ease), border-color var(--dur-2) var(--ease);
}

.study-switch {
  justify-content: flex-end;
  margin-bottom: 14px;
}

.language-viewport {
  overflow: hidden;
  border-radius: var(--r-md);
}

.language-viewport > header,
.language-viewport > footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
}

.language-viewport > header {
  border-bottom: 1px solid var(--line);
}

.language-viewport > header div {
  display: flex;
  align-items: center;
  gap: 12px;
}

.language-viewport > header span {
  display: grid;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  place-content: center;
  background: var(--amber-soft);
  color: var(--amber);
  font-family: var(--mono);
  font-size: .58rem;
  font-weight: 700;
}

.language-viewport > header small,
.language-viewport > footer {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .66rem;
}

.language-words > div {
  display: grid;
  grid-template-columns: .75fr 1.25fr;
  padding: 18px 24px;
  border-bottom: 1px solid var(--line);
  gap: 20px;
}

.language-words strong {
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 500;
}

.language-words span {
  color: var(--ink-soft);
}

.language-viewport > footer {
  background: var(--surface-2);
}

.language-viewport > footer b {
  color: var(--amber);
  font-weight: 500;
}

[data-study-demo="fr"] .language-viewport > header span {
  background: var(--st-new-soft);
  color: var(--st-new);
}

[data-study-demo="fr"] .language-viewport > footer b {
  color: var(--st-new);
}

.trust-section {
  padding-block: clamp(110px, 14vw, 200px);
  background: var(--local-bg);
  color: var(--local-text);
}

.trust-grid {
  display: grid;
  grid-template-columns: minmax(340px, .8fr) minmax(520px, 1.2fr);
  gap: clamp(60px, 10vw, 160px);
}

.trust-copy .eyebrow,
.trust-copy > p,
.trust-flow small {
  color: color-mix(in oklch, var(--local-text) 70%, transparent);
}

.trust-key-copy {
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--local-line);
  font-size: .9rem !important;
}

.trust-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.trust-core,
.trust-branch {
  border: 1px solid var(--local-line);
  background: color-mix(in oklch, var(--local-bg) 88%, var(--local-text));
}

.trust-core {
  display: grid;
  min-height: 150px;
  align-content: center;
  padding: 28px;
}

.trust-core strong {
  margin: 8px 0;
  font-family: var(--serif);
  font-size: 1.65rem;
  font-weight: 500;
}

.trust-branch {
  display: grid;
  grid-template-columns: 46px 1fr;
  align-items: center;
  padding: 18px 22px;
}

.trust-branch > span {
  color: color-mix(in oklch, var(--local-text) 54%, transparent);
  font-family: var(--mono);
  font-size: .64rem;
}

.trust-branch p {
  display: grid;
  margin: 0;
  gap: 3px;
}

.trust-branch strong {
  font-weight: 600;
}

.early-section {
  display: grid;
  grid-template-columns: minmax(340px, .8fr) minmax(500px, 1.2fr);
  align-items: start;
  padding-block: clamp(110px, 14vw, 190px);
  gap: clamp(60px, 10vw, 150px);
}

.early-invite {
  margin: 28px 0;
  padding: 13px 16px;
  border-left: 2px solid var(--amber);
  background: var(--amber-soft);
  color: var(--ink) !important;
  font-size: .86rem !important;
}

.early-form {
  padding: clamp(28px, 4vw, 52px);
  border-radius: var(--r-lg);
}

.early-form-heading h3 {
  margin: 12px 0 16px;
  font-size: clamp(2rem, 3.4vw, 3rem);
}

.early-form-heading p,
.form-field small,
.turnstile-slot p,
.early-form noscript p {
  color: var(--ink-soft);
  font-size: .8rem;
}

.form-field {
  display: grid;
  margin-top: 34px;
  gap: 8px;
}

.form-field label {
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .06em;
}

.form-field input {
  width: 100%;
  min-height: 52px;
  padding: 11px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-sm);
  color: var(--ink);
  background: var(--surface-2);
  font: inherit;
}

.form-field input[aria-invalid="true"] {
  border-color: var(--st-due);
}

.early-honeypot {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.turnstile-slot {
  min-height: 66px;
  margin: 22px 0 16px;
}

.turnstile-slot p {
  margin: 0;
}

.early-form > .button {
  width: 100%;
}

.early-form > .button:disabled {
  cursor: wait;
  opacity: .62;
  transform: none;
}

.form-status {
  min-height: 1.7em;
  margin: 13px 0 0;
  font-size: .82rem;
}

.form-status[data-state="error"] { color: var(--st-due); }
.form-status[data-state="success"] { color: var(--st-mastered); }
.form-status[data-state="busy"] { color: var(--ink-soft); }

.faq {
  padding-block: clamp(90px, 12vw, 160px);
}

.faq-list {
  border-top: 1px solid var(--line-strong);
}

.faq details {
  border-bottom: 1px solid var(--line);
}

.faq summary {
  position: relative;
  padding: 24px 48px 24px 0;
  cursor: pointer;
  font-family: var(--serif);
  font-size: clamp(1.15rem, 2vw, 1.35rem);
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  position: absolute;
  top: 24px;
  right: 8px;
  content: "+";
  color: var(--ink-soft);
  font-family: var(--mono);
}

.faq details[open] summary::after {
  content: "−";
}

.faq details p {
  max-width: 720px;
  margin: -4px 0 24px;
  color: var(--ink-soft);
}

.site-footer {
  padding-block: 38px;
  border-top: 1px solid var(--line);
}

.footer-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 40px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--serif);
}

.footer-brand small {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .58rem;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 12px 24px;
}

.site-footer nav a {
  color: var(--ink-soft);
  font-size: .76rem;
}

.js [data-reveal],
.js [data-feature],
.js .early-section,
.js .faq {
  opacity: 0;
  transform: translateY(20px);
}

.js [data-reveal].is-visible,
.js [data-feature].is-visible,
.js .early-section.is-visible,
.js .faq.is-visible,
.js [data-feature] [data-reveal] {
  opacity: 1;
  transform: none;
  transition: opacity var(--dur-3) var(--ease-out), transform var(--dur-3) var(--ease-out);
}

@media (max-width: 1180px) {
  .how-grid,
  .feature-section,
  .trust-grid,
  .early-section {
    gap: 52px;
  }

  .how-grid {
    grid-template-columns: minmax(280px, .7fr) minmax(520px, 1.3fr);
  }

  .demo-scene {
    padding: 34px;
  }
}

@media (max-width: 1080px) {
  .layout-wide {
    width: min(760px, calc(100% - 48px));
  }

  .how-section {
    padding-bottom: 100px;
  }

  .how-grid,
  .feature-section,
  .trust-grid,
  .early-section {
    grid-template-columns: 1fr;
  }

  .how-stage {
    display: none;
  }

  .how-step {
    min-height: auto;
    padding-block: 64px;
    opacity: 1;
  }

  .how-mobile-demo {
    display: block;
    margin-top: 38px;
  }

  .product-viewport--mobile {
    height: auto;
    min-height: 600px;
  }

  .product-viewport--mobile .demo-scene {
    position: relative;
    inset: auto;
    min-height: 545px;
    visibility: visible;
    opacity: 1;
  }

  .feature-section {
    min-height: auto;
  }

  .feature-section:nth-of-type(even) .feature-copy {
    order: initial;
  }

  .recommend-map,
  .domain-demo,
  .device-composition,
  .memory-visual,
  .language-demo {
    width: 100%;
    max-width: 760px;
  }

  .trust-flow {
    max-width: 760px;
  }

  .early-form {
    max-width: 720px;
  }
}

@media (min-width: 1081px) and (max-height: 720px) {
  .how-grid {
    grid-template-columns: 1fr;
  }

  .how-stage {
    display: none;
  }

  .how-step {
    min-height: auto;
    padding-block: 64px;
    opacity: 1;
  }

  .how-mobile-demo {
    display: block;
    max-width: 760px;
    margin-top: 38px;
  }

  .product-viewport--mobile {
    height: auto;
    min-height: 600px;
  }

  .product-viewport--mobile .demo-scene {
    position: relative;
    inset: auto;
    min-height: 545px;
    visibility: visible;
    opacity: 1;
  }
}

@media (max-width: 680px) {
  .layout-wide,
  .layout-reading {
    width: calc(100% - 30px);
  }

  .narrative-bridge {
    min-height: auto;
    padding-block: 72px;
  }

  .bridge-steps {
    grid-template-columns: 1fr;
    text-align: left;
  }

  .bridge-steps li {
    grid-template-columns: 42px 1fr;
    align-items: baseline;
    padding: 15px 4px;
  }

  .bridge-steps li:not(:last-child)::after {
    display: none;
  }

  .how-section {
    padding-block: 52px 80px;
  }

  .section-heading {
    margin-bottom: 28px;
  }

  .how-step-copy h3 {
    font-size: clamp(2rem, 10vw, 2.75rem);
  }

  .how-mobile-demo {
    margin-top: 28px;
  }

  .product-viewport--mobile {
    min-height: 535px;
  }

  .product-viewport--mobile .demo-scene {
    min-height: 480px;
    padding: 20px 16px;
  }

  .capture-window {
    padding: 22px 16px;
  }

  .capture-window p {
    font-size: 1.12rem;
  }

  .capture-card > strong {
    font-size: 1.65rem;
  }

  .demo-scene--understand {
    display: block;
  }

  .demo-scene--understand > * {
    margin-bottom: 12px;
  }

  .word-header strong {
    font-size: 2.5rem;
  }

  .review-ratings span,
  .review-ratings b {
    min-width: 0;
    flex: 1;
  }

  .review-modes-compact {
    display: none;
  }

  .feature-section,
  .early-section {
    padding-block: 82px;
    gap: 38px;
  }

  .recommend-map {
    aspect-ratio: .92;
  }

  .map-node {
    min-width: 74px;
    min-height: 40px;
    padding: 7px 10px;
    font-size: .78rem;
  }

  .map-node--center {
    min-width: 116px;
    min-height: 72px;
  }

  .domain-demo > header {
    grid-template-columns: 1fr;
    padding: 22px;
    gap: 8px;
  }

  .domain-demo > header p {
    padding: 14px 0 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .domain-tabs,
  .preset-followup {
    padding-inline: 18px;
  }

  .domain-panel {
    margin-inline: 18px;
    padding: 20px;
  }

  .preset-questions {
    flex-direction: column;
  }

  .preset-questions button {
    text-align: left;
  }

  .device-composition {
    min-height: 545px;
  }

  .browser-viewport {
    right: 0;
  }

  .browser-viewport article {
    min-height: 350px;
    padding: 60px 22px 36px;
  }

  .mini-mobile {
    width: 190px;
    padding: 20px 16px;
    border-radius: 25px;
  }

  .mini-mobile strong {
    margin-top: 20px;
  }

  .continuity-line {
    bottom: 24px;
    left: 0;
    width: calc(100% - 155px);
  }

  .memory-visual {
    min-height: 340px;
    overflow: hidden;
  }

  .memory-visual svg {
    width: 720px;
    max-width: none;
    transform: translateX(-110px);
  }

  .memory-point {
    min-width: 116px;
    padding: 9px;
  }

  .memory-point--review-one { left: 34%; }

  .language-words > div {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .language-viewport > footer {
    display: grid;
    gap: 5px;
  }

  .trust-section {
    padding-block: 84px;
  }

  .early-form {
    padding: 26px 20px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .site-footer nav {
    justify-content: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .js [data-reveal],
  .js [data-feature],
  .js .early-section,
  .js .faq,
  .js .recommend-map .map-node,
  .js .recommend-map .recommend-lines path {
    visibility: visible !important;
    opacity: 1 !important;
    transform: none !important;
  }
}