/* ============================================================
   Kotoba marketing site — layout
   Built entirely on the tokens in tokens.css. No new colors or
   sizes are invented here — only layout and component structure.
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--color-app-background);
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  font-size: var(--kotoba-size-body);
  line-height: var(--leading-normal);
}

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

a {
  color: inherit;
}

.container {
  max-width: 1180px;
  margin-inline: auto;
  padding-inline: var(--page-margin);
}

/* === NAV === */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-6) var(--page-margin);
}

.site-nav__mark {
  font-family: var(--font-serif-jp);
  font-size: var(--kotoba-size-title);
  font-weight: var(--weight-semibold);
  text-decoration: none;
  color: var(--color-text-primary);
}

.site-nav__links {
  display: none;
  gap: var(--space-16);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav__links a {
  text-decoration: none;
  font-size: var(--kotoba-size-callout);
  color: var(--color-text-secondary);
}

.theme-toggle {
  appearance: none;
  border: none;
  background: transparent;
  cursor: pointer;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-pill);
  display: grid;
  place-items: center;
  color: var(--color-text-primary);
}

@media (min-width: 900px) {
  .site-nav__links {
    display: flex;
  }
}

/* === HERO === */
.hero {
  padding-block: var(--space-32) var(--space-40);
}

.hero__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-24);
  text-align: center;
}

.hero__mark {
  font-family: var(--font-serif-jp);
  font-size: var(--kotoba-size-japanese-headline);
  font-weight: var(--weight-bold);
  line-height: var(--leading-tight);
  margin: 0;
}

.hero__mark rt {
  font-family: var(--font-serif);
  font-size: var(--kotoba-size-ruby);
  font-weight: var(--weight-regular);
  color: var(--color-text-secondary);
  letter-spacing: 0.05em;
}

.hero__headline {
  font-family: var(--font-serif);
  font-size: var(--kotoba-size-title);
  font-weight: var(--weight-semibold);
  color: var(--color-text-secondary);
  line-height: var(--leading-tight);
  margin: var(--space-3) 0 0;
}

.hero__blurb {
  max-width: 32rem;
  color: var(--color-text-secondary);
  font-size: var(--kotoba-size-callout);
  margin: 0;
}

/* === BUTTON === */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6) var(--space-14);
  border-radius: var(--radius-pill);
  text-decoration: none;
  font-size: var(--kotoba-size-callout);
  font-weight: var(--weight-medium);
}

.button--primary {
  border: 2px solid var(--color-ai);
  color: var(--color-ai);
}

/* === MEDIA FRAME (shared by every feature section) === */
.media-frame {
  border-radius: var(--radius-xl);
  overflow: hidden;
  flex: none;
}

.media-frame--hero {
  width: min(260px, 70vw);
}

@media (min-width: 900px) {
  .hero__inner {
    flex-direction: row;
    text-align: left;
    justify-content: space-between;
    gap: var(--space-32);
  }
  .hero__copy {
    max-width: 34rem;
  }
  .hero__blurb {
    max-width: none;
  }
}

/* === FEATURE SECTIONS === */
.feature {
  border-top: 1px solid var(--color-separator);
  padding-block: var(--space-32);
}

.feature__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-20);
  text-align: center;
}

.feature__eyebrow {
  font-family: var(--font-sans);
  font-size: var(--kotoba-size-eyebrow);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--color-ai);
  margin: 0 0 var(--space-4);
}

.feature__headline {
  font-family: var(--font-serif);
  font-size: var(--kotoba-size-title);
  font-weight: var(--weight-semibold);
  margin: 0 0 var(--space-6);
}

.feature__body {
  color: var(--color-text-secondary);
  margin: 0;
  max-width: 34rem;
}

.feature .media-frame {
  width: min(220px, 60vw);
}

.feature__media-pair {
  display: flex;
  gap: var(--space-8);
}

.feature__media-pair .media-frame {
  width: min(150px, 40vw);
}

@media (min-width: 900px) {
  .feature__inner {
    flex-direction: row;
    text-align: left;
    justify-content: space-between;
    gap: var(--space-32);
  }
  .feature--reverse .feature__inner {
    flex-direction: row-reverse;
  }
  .feature__copy {
    max-width: 30rem;
  }
  .feature .media-frame,
  .feature__media-pair .media-frame {
    width: 220px;
  }
}

/* === LIGHT & DARK TRIPTYCH === */
.feature__media-pair--triptych .media-frame {
  width: min(110px, 30vw);
}

@media (min-width: 900px) {
  .feature__media-pair--triptych .media-frame {
    width: 160px;
  }
}

/* === OFFLINE BAND === */
.offline-band {
  border-top: 1px solid var(--color-separator);
  background: var(--color-chip-background);
  padding-block: var(--space-32);
}

.offline-band__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-6);
}

.offline-band__icon {
  color: var(--color-ai);
  margin-bottom: var(--space-4);
}

/* === FOOTER === */
.site-footer {
  padding-block: var(--space-16);
}

.site-footer__inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  align-items: center;
  text-align: center;
  color: var(--color-text-tertiary);
  font-size: var(--kotoba-size-caption);
}

.site-footer__links {
  display: flex;
  gap: var(--space-16);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-footer__links a {
  text-decoration: none;
  color: var(--color-text-secondary);
}

@media (min-width: 900px) {
  .site-footer__inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}