@font-face {
  font-family: Manrope;
  src: url("/assets/manrope-latin.woff2") format("woff2");
  font-weight: 200 800;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: Manrope;
  src: url("/assets/manrope-latin-ext.woff2") format("woff2");
  font-weight: 200 800;
  font-display: swap;
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

@font-face {
  font-family: Manrope;
  src: url("/assets/manrope-cyrillic.woff2") format("woff2");
  font-weight: 200 800;
  font-display: swap;
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}

@font-face {
  font-family: "Plus Jakarta Sans";
  src: url("/assets/plus-jakarta-sans-latin.woff2") format("woff2");
  font-weight: 200 800;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "Plus Jakarta Sans";
  src: url("/assets/plus-jakarta-sans-latin-ext.woff2") format("woff2");
  font-weight: 200 800;
  font-display: swap;
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

:root {
  color-scheme: light;
  --paper: #fbf9f4;
  --white: #fff;
  --ink: #15233b;
  --muted: #4b5667;
  --blue: #255ab9;
  --blue-hover: #1b4697;
  --navy: #112b55;
  --navy-ink: #dce7fa;
  --navy-line: #6f86ad;
  --blue-paper: #eef3fc;
  --line: #cdd8e9;
  --gold: #f6c759;
  --coral: #f4a08f;
  --display: Manrope, system-ui, sans-serif;
  --body: "Plus Jakarta Sans", Manrope, system-ui, sans-serif;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font: 1rem/1.65 var(--body);
}

::selection { color: var(--navy); background: var(--gold); }

:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 4px;
}

a { color: inherit; text-underline-offset: 0.25em; }
img { display: block; max-inline-size: 100%; }
p, blockquote, figure { margin: 0; }

h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--display);
  line-height: 1.12;
  text-wrap: balance;
}

h1 {
  font-size: clamp(2.75rem, 4.6vw, 4.125rem);
  font-weight: 800;
  letter-spacing: -0.04em;
}

h1 em { color: var(--blue); font-style: normal; }

html:lang(ja) {
  --display: Manrope, "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  --body: "Plus Jakarta Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
}

:lang(ja) h1 { line-height: 1.25; }

h2 {
  font-size: clamp(2rem, 3.6vw, 3.125rem);
  font-weight: 800;
  letter-spacing: -0.035em;
}

h3 { font-size: 1.4375rem; letter-spacing: -0.02em; }
h4 { font-size: 1.125rem; }

.wrap {
  inline-size: min(100% - clamp(2rem, 8vw, 8rem), 75rem);
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  z-index: 2;
  inset-block-start: 0.75rem;
  inset-inline-start: 1rem;
  padding: 0.75rem 1rem;
  color: var(--white);
  background: var(--navy);
  transform: translateY(-200%);
}

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

.site-header { border-block-end: 1px solid var(--line); }

.header-inner,
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  min-block-size: 4.75rem;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  font: 800 1.35rem/1 var(--display);
  letter-spacing: -0.035em;
  text-decoration: none;
}

.header-nav,
.footer-inner nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  column-gap: clamp(0.75rem, 3vw, 2rem);
  font-size: 0.875rem;
  font-weight: 700;
}

.header-nav a,
.footer-inner nav a {
  display: inline-flex;
  align-items: center;
  min-block-size: 2.75rem;
  text-decoration: none;
}

.header-nav a:hover,
.footer-inner nav a:hover,
.header-nav a[aria-current="page"] { text-decoration: underline; }

.header-nav .sign-in {
  color: var(--blue);
  border-block-end: 1px solid var(--blue);
}

.hero,
.team-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  align-items: center;
  gap: clamp(2rem, 5.5vw, 5.5rem);
  padding-block: clamp(3.5rem, 7vw, 6rem);
}

.hero-intro {
  max-inline-size: 34rem;
  margin-block: 1.375rem 1.75rem;
  color: var(--muted);
  font-size: clamp(1.0625rem, 1.6vw, 1.25rem);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.25rem;
}

.button,
.text-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  min-block-size: 3rem;
  font-size: 0.875rem;
  font-weight: 800;
}

.button {
  padding: 0.75rem 1.125rem;
  color: var(--white);
  background: var(--blue);
  border-radius: 0.5rem;
  text-decoration: none;
}

.button:hover { background: var(--blue-hover); }

.text-link { color: var(--blue); }
.text-link:hover { color: var(--blue-hover); }

.arrow {
  position: relative;
  inline-size: 0.9rem;
  block-size: 0.8rem;
}

.arrow::before,
.arrow::after {
  position: absolute;
  content: "";
}

.arrow::before {
  inset: 50% 0 0 0;
  border-block-start: 1.5px solid currentColor;
}

.arrow::after {
  inset-block-start: 50%;
  inset-inline-end: 0;
  inline-size: 0.38rem;
  block-size: 0.38rem;
  border-block-start: 1.5px solid currentColor;
  border-inline-end: 1.5px solid currentColor;
  transform: translateY(-50%) rotate(45deg);
}

.arrow-down { transform: rotate(90deg); }

.hero-scene {
  overflow: hidden;
  background: var(--navy);
  border-radius: 0.875rem;
}

.hero-scene img {
  inline-size: 100%;
  block-size: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.hero-scene figcaption {
  padding: 0.875rem 1.25rem;
  color: var(--white);
  font-size: 0.9375rem;
}

.scene-title {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.125rem 0.875rem;
  font-weight: 700;
}

.scene-caption { color: var(--gold); font-size: 0.8125rem; }

.scene-milestones {
  display: flex;
  flex-wrap: wrap;
  column-gap: 0.875rem;
  row-gap: 0.25rem;
  padding: 0;
  margin: 0.625rem 0 0;
  color: var(--navy-ink);
  font-size: 0.8125rem;
  list-style: none;
}

.scene-milestones li {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
}

.scene-milestones li::before {
  inline-size: 0.3rem;
  block-size: 0.3rem;
  border-radius: 50%;
  background: var(--gold);
  content: "";
}

.example-section {
  padding-block: clamp(3rem, 7.5vw, 6.25rem);
  background: var(--blue-paper);
  border-block: 1px solid var(--line);
}

.section-intro { max-inline-size: 46rem; }

.section-intro p {
  margin-block-start: 0.875rem;
  color: var(--muted);
  font-size: 1.0625rem;
}

.example-grid,
.practice,
.work-example,
.faq {
  display: grid;
  grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr);
  gap: clamp(1.75rem, 5.5vw, 5.5rem);
}

.example-grid { margin-block-start: 2.5rem; }

.example-story { align-self: center; }

.story-step {
  padding-block: 1.25rem;
  border-block-start: 1px solid var(--line);
}

.story-step h3 { margin-block-end: 0.625rem; }
.story-step p { color: var(--muted); }

/* The learner's own words read as a message, the way they arrive in the app. */
.story-step blockquote {
  inline-size: fit-content;
  max-inline-size: 100%;
  margin-block: 0.625rem 0.75rem;
  padding: 0.625rem 0.875rem;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 0.875rem 0.875rem 0.875rem 0.25rem;
  font-weight: 700;
  line-height: 1.5;
}

.path-sheet {
  align-self: start;
  padding: clamp(1.125rem, 3.25vw, 2.25rem);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 0.875rem;
}

.path-heading {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.375rem 1rem;
  padding-block-end: 0.875rem;
  border-block-end: 1px solid var(--line);
}

.path-heading span { color: var(--muted); font-size: 0.8125rem; }

.milestones {
  padding: 0;
  margin: 0;
  list-style: none;
}

.milestones li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.875rem;
  align-items: start;
  padding-block: 0.875rem;
}

.milestones li + li { border-block-start: 1px solid var(--line); }
.milestones li:last-child { padding-block-end: 0; }

.milestone-number {
  display: grid;
  place-items: center;
  inline-size: 1.875rem;
  block-size: 1.875rem;
  border-radius: 50%;
  color: var(--navy);
  background: var(--blue-paper);
  font: 800 0.8125rem/1 var(--display);
}

.milestones li:first-child .milestone-number { background: var(--gold); }

.milestones small {
  display: block;
  color: var(--muted);
  font-size: 0.875rem;
}

.practice {
  align-items: start;
  margin-block-start: 2.5rem;
  padding: clamp(1.25rem, 3.5vw, 2.5rem);
  color: var(--white);
  background: var(--navy);
  border-radius: 0.875rem;
}

.practice-copy h3 { font-size: clamp(1.4rem, 2.8vw, 2rem); }
.practice-copy p { margin-block-start: 0.75rem; color: var(--navy-ink); }

summary {
  cursor: pointer;
  font-weight: 800;
  list-style: none;
}

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

/* One drawn chevron for every disclosure; it turns up when the panel opens. */
.faq-list summary::after,
.language-picker summary::after {
  flex: none;
  inline-size: 0.45rem;
  block-size: 0.45rem;
  margin-block-start: -0.2rem;
  border-block-end: 1.5px solid currentColor;
  border-inline-end: 1.5px solid currentColor;
  content: "";
  rotate: 45deg;
}

.faq-list details[open] > summary::after,
.language-picker[open] > summary::after {
  margin-block-start: 0.2rem;
  rotate: -135deg;
}

.choices { margin-block-start: 0.875rem; }

.choices details { border-block-start: 1px solid var(--navy-line); }

/* Answer marker: a neutral ring until revealed, then a check or a cross. */
.choices summary {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-block-size: 2.75rem;
  padding-block: 0.375rem;
}

.choices summary::before {
  flex: none;
  inline-size: 1.25rem;
  block-size: 1.25rem;
  border: 1.5px solid var(--navy-line);
  border-radius: 50%;
  content: "";
}

.choices summary:hover::before { border-color: var(--navy-ink); }
.choices summary:hover { color: var(--gold); }
.choices summary:focus-visible { outline-color: var(--gold); }

.choices details[data-correct][open] > summary { color: var(--gold); }

.choices details[data-correct][open] > summary::before {
  background: var(--gold);
  border-color: var(--gold);
}

.choices details[data-correct][open] > summary::after {
  position: absolute;
  inset-block-start: 50%;
  inset-inline-start: 0.4375rem;
  inline-size: 0.375rem;
  block-size: 0.6875rem;
  border-block-end: 2px solid var(--navy);
  border-inline-end: 2px solid var(--navy);
  content: "";
  transform: translateY(-62%) rotate(45deg);
}

.choices details:not([data-correct])[open] > summary::before {
  border-color: var(--coral);
  background:
    linear-gradient(45deg, transparent 44%, var(--coral) 44% 56%, transparent 56%) center / 0.625rem 0.625rem no-repeat,
    linear-gradient(-45deg, transparent 44%, var(--coral) 44% 56%, transparent 56%) center / 0.625rem 0.625rem no-repeat;
}

.choices p {
  margin-block: 0 0.75rem;
  padding-inline-start: 2rem;
  color: var(--navy-ink);
  font-size: 0.875rem;
}

.choices details[data-correct] p strong { color: var(--gold); }

.faq {
  padding-block: clamp(3rem, 7.5vw, 6.25rem);
}

.faq .button,
.section-intro .button { margin-block-start: 1.5rem; }
.faq-list { border-block-end: 1px solid var(--line); }

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

.faq-list summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-block-size: 3.25rem;
  padding-block: 0.875rem;
}

.faq-list summary:hover { color: var(--blue); }

.faq-list p {
  margin-block: -0.25rem 1rem;
  max-inline-size: 65ch;
  color: var(--muted);
}

.demo-placeholder {
  display: grid;
  align-content: center;
  justify-items: center;
  min-block-size: 19rem;
  padding: 2rem 1.25rem;
  color: var(--navy-ink);
  background: var(--navy);
  border-radius: 0.875rem;
  text-align: center;
}

.demo-icon {
  inline-size: 3.5rem;
  block-size: 3.5rem;
  margin-block-end: 1.125rem;
  color: var(--gold);
}

.demo-icon circle { fill: none; stroke: currentColor; stroke-width: 1.5; }
.demo-icon path { fill: currentColor; }

.demo-title {
  color: var(--white);
  font: 800 1.375rem/1.35 var(--display);
}

.demo-description { margin-block-start: 0.5rem; font-size: 0.875rem; }
.demo-placeholder a:focus-visible { outline-color: var(--gold); }

.site-footer { border-block-start: 1px solid var(--line); }
.footer-inner { padding-block: 0.75rem; }
.footer-inner nav { margin-inline-start: auto; }

.language-picker {
  position: relative;
  font-size: 0.875rem;
}

.language-picker summary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-block-size: 2.75rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  color: var(--navy);
  background: var(--white);
  font-weight: 700;
}

.language-picker summary:hover,
.language-picker[open] > summary { border-color: var(--blue); }

.picker-icon {
  flex: none;
  inline-size: 1rem;
  block-size: 1rem;
  fill: none;
  stroke: var(--blue);
  stroke-width: 1.25;
}

.language-picker ul {
  position: absolute;
  z-index: 2;
  inset-block-start: 100%;
  inset-inline-start: 0;
  min-inline-size: 9rem;
  padding: 0.375rem;
  margin: 0.5rem 0 0;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: var(--white);
  box-shadow: 0 0.5rem 1.5rem #112b551a;
  list-style: none;
}

.language-picker a {
  display: flex;
  align-items: center;
  min-block-size: 2rem;
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  text-decoration: none;
}

.language-picker a:hover { background: var(--blue-paper); }

.language-picker a[aria-current="page"] {
  color: var(--blue);
  background: var(--blue-paper);
  font-weight: 800;
}

.scenarios {
  padding-block: clamp(3rem, 7.5vw, 6.25rem);
  border-block-end: 1px solid var(--line);
}

.scenario-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  column-gap: clamp(1.25rem, 4vw, 3.5rem);
  padding: 0;
  margin: 2rem 0 0;
  list-style: none;
}

.scenario-list li {
  padding-block: 1rem;
  border-block-start: 1px solid var(--line);
}

.scenario-list h3 { text-wrap: wrap; }
.scenario-list p { margin-block-start: 0.5rem; color: var(--muted); }

@media (max-width: 52rem) {
  .hero, .team-hero { grid-template-columns: minmax(0, 1fr); }
  .hero-copy { max-inline-size: 39rem; }
  .example-grid, .practice, .work-example, .faq {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 29rem) {
  .header-inner,
  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.25rem;
    padding-block: 0.75rem;
  }

  .header-brand,
  .header-nav { inline-size: 100%; }
  .header-brand { justify-content: space-between; }
  .header-nav .sign-in { margin-inline-start: auto; }
  .footer-inner nav { margin-inline-start: 0; }
  .language-picker ul { inset-inline: auto 0; }
  .scenario-list { grid-template-columns: minmax(0, 1fr); }
  .hero, .team-hero { padding-block: 2.5rem; }
}

@media (prefers-reduced-motion: no-preference) {
  .hero-scene, .demo-placeholder {
    animation: scene-arrival 450ms var(--ease-out) both;
  }

  .scene-milestones li {
    animation: milestone-arrival 300ms var(--ease-out) both;
  }

  .scene-milestones li:nth-child(2) { animation-delay: 70ms; }
  .scene-milestones li:nth-child(3) { animation-delay: 140ms; }

  .button { transition: background-color 160ms ease; }
  .arrow { transition: translate 180ms var(--ease-out); }
  .button:hover .arrow { translate: 0.2rem 0; }
  .text-link:hover .arrow-down { translate: 0 0.2rem; }

  .choices details[open] p {
    animation: milestone-arrival 230ms var(--ease-out) both;
  }

  .faq-list summary::after,
  .language-picker summary::after { transition: rotate 200ms var(--ease-out), margin 200ms var(--ease-out); }
  .faq-list summary,
  .choices summary { transition: color 160ms ease; }
  .choices summary::before { transition: background-color 160ms ease, border-color 160ms ease; }
  .faq-list details[open] p { animation: milestone-arrival 230ms var(--ease-out) both; }

  @supports (animation-timeline: view()) {
    .milestones li {
      animation: milestone-arrival linear both;
      animation-timeline: view();
      animation-range: entry;
    }
  }
}

@keyframes scene-arrival {
  from { translate: 0 0.75rem; }
  to { translate: 0 0; }
}

@keyframes milestone-arrival {
  from { translate: 0 0.375rem; }
  to { translate: 0 0; }
}

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