/*
 * Shared public-page primitives.
 *
 * These classes describe Pythia's common visual grammar without replacing the
 * landing .pyl-* composition, Blog .pb-* reading system, or page-owned modules.
 */

.public-page-intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(16rem, 0.48fr);
  align-items: end;
  gap: clamp(var(--public-space-6), 5vw, var(--public-space-8));
  padding: clamp(3.5rem, 8vw, 7.5rem) 0 clamp(3.75rem, 7vw, 6.5rem);
  border-bottom: 1px solid var(--line);
}

.public-page-intro > :only-child {
  grid-column: 1 / -1;
}

.public-kicker {
  margin: 0 0 var(--public-space-5);
  color: var(--cyan);
  font-family: var(--public-font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.public-page-title {
  max-width: 16ch;
  margin: 0;
  color: var(--text);
  font-family: var(--public-font-display);
  font-size: clamp(3rem, 7vw, 6.75rem);
  font-weight: 600;
  line-height: 0.94;
  letter-spacing: -0.055em;
  text-wrap: balance;
}

.public-page-title em,
.public-page-title .public-accent {
  color: var(--green);
  font-style: normal;
  font-weight: 500;
}

.public-page-lede {
  max-width: var(--public-measure-compact);
  margin: var(--public-space-5) 0 0;
  color: var(--muted);
  font-family: var(--public-font-body);
  font-size: clamp(1rem, 1.3vw, 1.2rem);
  line-height: 1.7;
}

.public-flow-section {
  position: relative;
  padding: var(--public-section-space) 0;
  border-bottom: 1px solid var(--line);
}

.public-flow-section:last-child {
  border-bottom: 0;
}

.public-section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(16rem, 0.46fr);
  align-items: end;
  gap: clamp(var(--public-space-5), 4vw, var(--public-space-8));
  margin-bottom: clamp(var(--public-space-7), 6vw, var(--public-space-8));
}

.public-section-head > :only-child {
  grid-column: 1 / -1;
}

.public-section-head h2 {
  max-width: 18ch;
  margin: 0;
  color: var(--text);
  font-family: var(--public-font-display);
  font-size: clamp(2.25rem, 4.8vw, 4.75rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.045em;
  text-wrap: balance;
}

.public-section-head > p,
.public-section-head > div > p:last-child {
  max-width: var(--public-measure-compact);
  margin: 0;
  color: var(--muted);
  font-family: var(--public-font-body);
  line-height: 1.7;
}

.public-action {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.7rem 1rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--public-radius);
  color: var(--text);
  background: var(--panel);
  font-family: var(--public-font-body);
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition:
    color var(--public-motion-fast) ease,
    background var(--public-motion-fast) ease,
    border-color var(--public-motion-fast) ease,
    transform var(--public-motion-fast) ease;
}

.public-action:hover,
.public-action:focus-visible {
  border-color: var(--cyan);
  background: var(--panel-strong);
}

.public-action:active {
  transform: translateY(1px);
}

.public-action--primary {
  color: var(--public-on-accent);
  border-color: transparent;
  background: linear-gradient(90deg, var(--blue), var(--cyan));
}

.public-action--primary:hover,
.public-action--primary:focus-visible {
  color: var(--public-on-accent);
  border-color: transparent;
  background: linear-gradient(90deg, var(--blue), var(--cyan));
  filter: brightness(1.08);
}

.public-action--secondary {
  background: transparent;
}

.public-action--quiet {
  min-height: 0;
  padding: 0.35rem 0;
  border-color: transparent;
  border-radius: 0;
  color: var(--muted);
  background: transparent;
}

.public-action--quiet:hover,
.public-action--quiet:focus-visible {
  color: var(--text);
  border-color: transparent;
  background: transparent;
}

.public-action svg {
  width: 1.05em;
  height: 1.05em;
  flex: 0 0 auto;
}

.public-media-frame {
  position: relative;
  min-width: 0;
  margin: 0;
  overflow: clip;
  border: 1px solid var(--line);
  border-radius: var(--public-radius);
  background: var(--panel);
  box-shadow: 0 24px 60px var(--shadow);
}

.public-media-frame > :where(img, video, iframe, svg) {
  display: block;
  width: 100%;
}

.public-media-frame figcaption,
.public-media-frame__caption {
  padding: var(--public-space-3) var(--public-space-4);
  border-top: 1px solid var(--line);
  color: var(--quiet);
  font-family: var(--public-font-mono);
  font-size: 0.72rem;
  line-height: 1.55;
}

.public-link-rail {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr));
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.public-link-rail > * {
  min-width: 0;
  border-bottom: 1px solid var(--line);
}

.public-link-rail a {
  display: flex;
  min-height: 72px;
  align-items: center;
  justify-content: space-between;
  gap: var(--public-space-4);
  padding: var(--public-space-4);
  color: var(--muted);
  font-family: var(--public-font-body);
  font-weight: 600;
  text-decoration: none;
  transition: color var(--public-motion-fast) ease, background var(--public-motion-fast) ease;
}

.public-link-rail a:hover,
.public-link-rail a:focus-visible {
  color: var(--text);
  background: var(--panel);
}

.public-final-nav {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: clamp(var(--public-space-6), 6vw, var(--public-space-8));
  padding: var(--public-section-space) 0;
  border-top: 1px solid var(--line);
}

.public-final-nav h2 {
  max-width: 18ch;
  margin: 0;
  color: var(--text);
  font-family: var(--public-font-display);
  font-size: clamp(2rem, 4vw, 4rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.045em;
  text-wrap: balance;
}

.public-final-nav p {
  max-width: var(--public-measure-compact);
  margin: var(--public-space-4) 0 0;
  color: var(--muted);
  font-family: var(--public-font-body);
  line-height: 1.65;
}

/*
 * Reveals are opt-in and progressively enhanced. Merely adding
 * .public-reveal never hides content; scripts must also add .is-pending.
 */
.public-reveal {
  opacity: 1;
  transform: none;
  transition:
    opacity var(--public-motion-reveal) var(--public-ease),
    transform var(--public-motion-reveal) var(--public-ease);
}

.public-reveal.is-pending {
  opacity: 0;
  transform: translateY(14px);
}

.public-reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (max-width: 720px) {
  .public-page-intro,
  .public-section-head,
  .public-final-nav {
    grid-template-columns: 1fr;
  }

  .public-page-intro {
    align-items: start;
  }

  .public-page-title {
    font-size: clamp(2.8rem, 15vw, 4.8rem);
  }

  .public-link-rail {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .public-reveal,
  .public-reveal.is-pending,
  .public-reveal.is-visible {
    opacity: 1;
    transform: none;
  }

  .public-action:active {
    transform: none;
  }
}