/* Japanese-first presentation and language-switch UI.
   Loaded after the existing site styles to preserve the no-build static setup. */

.header-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 18px;
  min-width: 0;
}

.developer-header-actions {
  gap: 10px;
}

.lang-switch {
  display: inline-flex;
  flex: 0 0 auto;
  gap: 2px;
  padding: 3px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  background: rgba(5, 8, 13, 0.54);
  backdrop-filter: blur(10px);
}

.lang-switch a {
  min-width: 40px;
  padding: 5px 9px;
  border-radius: 999px;
  color: var(--text-muted);
  font-size: 0.72rem;
  font-weight: 760;
  line-height: 1.25;
  text-align: center;
  text-decoration: none;
  transition: background 0.18s ease, color 0.18s ease;
}

.lang-switch a:hover,
.lang-switch a:focus-visible {
  color: var(--text);
}

.lang-switch a[aria-current="page"] {
  background: rgba(139, 211, 255, 0.14);
  color: var(--text);
  box-shadow: inset 0 0 0 1px rgba(139, 211, 255, 0.1);
}

html[lang="ja"] body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN",
    "Yu Gothic", "YuGothic", "Meiryo", "Noto Sans JP", sans-serif;
  line-height: 1.9;
}

html[lang="ja"] .eyebrow,
html[lang="ja"] .section-label,
html[lang="ja"] .status-badge,
html[lang="ja"] .opening-logo p {
  text-transform: none;
}

html[lang="ja"] .eyebrow {
  letter-spacing: 0.08em;
}

html[lang="ja"] .eyebrow span {
  margin-left: 0.7em;
  color: rgba(255, 255, 255, 0.48);
  font-size: 0.76em;
  letter-spacing: 0.14em;
}

.hero-note {
  max-width: 680px;
  margin: 0 0 18px;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.88rem;
  font-weight: 650;
  letter-spacing: 0.035em;
}

html[lang="ja"] .hero h1,
html[lang="ja"] .developer-hero h1,
html[lang="ja"] .section h2 {
  letter-spacing: -0.025em;
  line-height: 1.28;
}

html[lang="ja"] .hero h1 {
  line-height: 1.18;
}

html[lang="ja"] .section-watermark {
  color: rgba(255, 255, 255, 0.026);
  font-family: "Yu Mincho", "YuMincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(5.5rem, 13vw, 11.5rem);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.section-label {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.section-label small {
  color: rgba(255, 255, 255, 0.42);
  font-size: 0.68em;
  font-weight: 760;
  letter-spacing: 0.13em;
}

html[lang="ja"] .interlude-track {
  font-family: "Yu Mincho", "YuMincho", "Hiragino Mincho ProN", serif;
}

html[lang="ja"] .interlude-track span {
  letter-spacing: 0.12em;
}

html[lang="ja"] .opening-logo p {
  letter-spacing: 0.13em;
}

.diver-showcase {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  align-items: stretch;
  gap: 54px;
}

.diver-visual {
  position: relative;
  min-height: 620px;
  margin: 0;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.11);
  border-radius: var(--radius);
  background: #0d1119;
  box-shadow: 0 34px 90px rgba(0, 0, 0, 0.32);
}

.diver-visual::after {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to top, rgba(5, 8, 13, 0.92), rgba(5, 8, 13, 0.04) 54%),
    linear-gradient(135deg, rgba(139, 211, 255, 0.08), transparent 42%);
  content: "";
  pointer-events: none;
}

.diver-visual img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 620px;
  object-fit: cover;
  object-position: center;
  filter: saturate(0.88) contrast(0.96);
}

.diver-visual figcaption {
  position: absolute;
  right: 28px;
  bottom: 28px;
  left: 28px;
  z-index: 2;
}

.diver-visual figcaption strong,
.diver-visual figcaption span {
  display: block;
}

.diver-visual figcaption strong {
  margin-bottom: 6px;
  color: var(--text);
  font-size: 1.15rem;
}

.diver-visual figcaption span {
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.85rem;
}

.diver-copy {
  align-self: center;
}

.diver-copy .prose {
  margin-top: 26px;
}

.diver-status {
  margin-top: 30px;
}

html[lang="ja"] .status-badge {
  letter-spacing: 0.04em;
}

body:not(.developer-page) .section-cta {
  background-image:
    linear-gradient(90deg, rgba(7, 10, 16, 0.95) 0%, rgba(7, 10, 16, 0.82) 45%, rgba(7, 10, 16, 0.55) 100%),
    linear-gradient(to bottom, rgba(7, 10, 16, 0.48), rgba(7, 10, 16, 0.9)),
    url("../images/site/optional/landscape-alt.webp");
  background-position: center;
  background-size: cover;
}

html[lang="ja"] .feature-card,
html[lang="ja"] .status-panel,
html[lang="ja"] .dev-card,
html[lang="ja"] .site-visual-figure {
  border-radius: 18px;
}

html[lang="ja"] .feature-card h3,
html[lang="ja"] .status-panel h3,
html[lang="ja"] .dev-card h3 {
  letter-spacing: -0.01em;
}

html[lang="ja"] .feature-card {
  min-height: 250px;
}

html[lang="ja"] .feature-card h3 {
  margin-top: 46px;
}

html[lang="ja"] .developer-meta-row {
  font-size: 0.86rem;
}

.language-en .section-label {
  gap: 0.55rem;
}

.language-en .hero-note {
  max-width: 720px;
}

@media (max-width: 1080px) {
  .header-actions {
    gap: 12px;
  }

  .site-nav {
    gap: 8px 15px;
  }

  .site-nav a {
    font-size: 0.84rem;
  }
}

@media (max-width: 900px) {
  .header-inner {
    align-items: flex-start;
  }

  .header-actions {
    width: 100%;
    align-items: flex-start;
    justify-content: space-between;
  }

  .diver-showcase {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .diver-visual,
  .diver-visual img {
    min-height: 0;
  }

  .diver-visual img {
    aspect-ratio: 16 / 10;
  }
}

@media (max-width: 680px) {
  .header-actions,
  .developer-header-actions {
    flex-direction: column-reverse;
    gap: 10px;
  }

  .lang-switch {
    align-self: flex-end;
  }

  .site-nav {
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 2px;
    scrollbar-width: none;
  }

  .site-nav::-webkit-scrollbar {
    display: none;
  }

  .site-nav a {
    flex: 0 0 auto;
    white-space: nowrap;
  }

  .developer-header-actions .page-switch {
    order: 0;
  }

  .diver-visual {
    border-radius: 16px;
  }

  .diver-visual figcaption {
    right: 18px;
    bottom: 18px;
    left: 18px;
  }

  .hero-note {
    font-size: 0.8rem;
  }

  html[lang="ja"] .section-watermark {
    font-size: 22vw;
  }
}