/* 3.1 release campaign. Retain the established Neural Goban tokens:
   navy #07101e, cyan #59e3d6, iris #7a6bf5, gold #edab4a, white #f5f8ff.
   Sora: display; Manrope: reading; IBM Plex Mono: version/status labels.
   Signature: one three-platform entry rail, with status beside each action. */
.release-31 .phone-screen {
  aspect-ratio: 660 / 1434;
}

/* Current captures need none of the legacy screenshot masks or overlays. */
.release-31 .phone-screen::before,
.release-31 .phone-screen::after {
  display: none;
}

.release-31 .hero {
  padding-top: calc(var(--header-height) + 32px);
}

.release-31 .hero-copy {
  padding-bottom: 20px;
}

.release-31 .hero h1 {
  max-width: none;
  font-size: clamp(3rem, 4.8vw, 4.4rem);
  line-height: 1.04;
  margin-bottom: 22px;
}

.release-31 .hero-lead {
  max-width: 48ch;
  font-size: 1rem;
}

.platform-choices {
  display: grid;
  margin-top: 26px;
  border-block: 1px solid var(--line-strong);
}

.platform-choice {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  min-height: 88px;
  padding: 14px 8px;
  transition: background-color 160ms ease;
}

.platform-choice + .platform-choice {
  border-top: 1px solid var(--line);
}

.platform-choice:hover,
.platform-choice:focus-visible {
  background-color: var(--surface-soft);
}

.platform-icon {
  width: 26px;
  height: 26px;
  color: var(--neural-cyan);
}

.platform-info {
  display: grid;
  gap: 5px;
}

.platform-info strong {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 10px;
  font-size: 0.98rem;
  line-height: 1.4;
}

.platform-status {
  color: var(--neural-cyan);
  font: 500 0.65rem / 1.5 var(--mono);
}

.platform-status-test {
  color: var(--goban-gold);
}

.platform-info > span {
  color: var(--text-soft);
  font-size: 0.76rem;
  line-height: 1.5;
}

.platform-action {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  color: var(--text);
  font-size: 0.79rem;
  font-weight: 800;
  white-space: nowrap;
}

.platform-action > span {
  color: var(--neural-cyan);
}

.platform-help {
  margin-top: 14px;
  color: var(--muted);
  font-size: 0.74rem;
  line-height: 1.7;
}

.platform-help a {
  display: inline-block;
  padding-block: 4px;
  color: var(--text-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (min-width: 901px) {
  .release-31 .hero-grid {
    min-height: 650px;
    grid-template-columns: minmax(0, 1.1fr) minmax(350px, 1fr);
    gap: clamp(34px, 5vw, 80px);
  }
  .release-31 .hero-stage { min-height: 650px; }
  .release-31 .phone-hero { width: 300px; }
}

@media (max-width: 900px) {
  .release-31 .hero-copy { max-width: 640px; }
  .release-31 .hero h1 { font-size: clamp(2.15rem, 9.7vw, 4.4rem); }
}

@media (max-width: 620px) {
  .release-31 .hero { padding-top: calc(var(--header-height) + 24px); }
  .release-31 .hero h1 { margin-bottom: 18px; }
  .release-31 .hero-lead { font-size: 0.9rem; line-height: 1.65; }
  .release-31 .hero-stage { min-height: 640px; }
  .release-31 .match-card-bottom { right: 0; }
  .platform-choices { margin-top: 20px; }
  .platform-choice { grid-template-columns: 23px minmax(0, 1fr) auto; gap: 10px; padding: 12px 0; }
  .platform-icon { width: 22px; height: 22px; }
  .platform-info strong { font-size: 0.88rem; gap: 2px 8px; }
  .platform-info > span { font-size: 0.71rem; }
  .platform-status { font-size: 0.61rem; }
  .platform-action { font-size: 0.72rem; gap: 5px; }
  .platform-help { font-size: 0.7rem; }
}

@media (prefers-reduced-motion: reduce) {
  .platform-choice { transition: none; }
}