/* Base styles for the public demo index page and shared layout. */
:root {
  color-scheme: light;
  --page-bg: #eff2f5;
  --surface: #ffffff;
  --surface-border: #d2d9e0;
  --text-main: #1d252d;
  --text-muted: #47505a;
  --brand-bg: #18171c;
  --accent: #0063a8;
  --accent-strong: #004d82;
  --focus-ring-inner: #ffffff;
  --focus-ring-outer: #1d252d;
  --focus-ring-dark-bg: #7dd3fc;
  --brand-logo-width: clamp(12rem, 34vw, 16rem);
  --brand-subtitle-offset: clamp(
    3.12rem,
    calc((var(--brand-logo-width) * 0.2675) - 0.09rem),
    4.2rem
  );
}

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

body {
  margin: 0;
  overflow-x: auto;
  background: radial-gradient(circle at top right, #f8fafc, var(--page-bg) 40%);
  color: var(--text-main);
  font-family: 'Avenir Next', 'Segoe UI', 'Helvetica Neue', sans-serif;
  line-height: 1.5;
}

.page-shell {
  min-width: 320px;
}

.skip-link {
  position: absolute;
  top: -9999px;
  left: 1rem;
  z-index: 1000;
  padding: 0.6rem 0.9rem;
  border-radius: 0.5rem;
  background: #1d252d;
  color: #fff;
  font-weight: 600;
}

.skip-link:focus {
  top: 1rem;
  outline: none;
  box-shadow: 0 0 0 3px var(--focus-ring-dark-bg);
}

.site-header {
  background: var(--brand-bg);
  color: #fff;
  font-family: 'Avenir Next', 'Segoe UI', 'Helvetica Neue', sans-serif;
}

.header-inner {
  max-width: 70rem;
  margin: 0 auto;
  padding: 1.1rem 1rem 1rem;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
}

.build-version {
  margin: 0 0 0.15rem;
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: #c8cdd6;
  white-space: nowrap;
}

.brand-lockup {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
}

.brand-logo {
  width: var(--brand-logo-width);
  height: auto;
}

.brand-subtitle {
  margin: -0.875rem 0 0 var(--brand-subtitle-offset);
  font-size: clamp(0.7rem, 1.2vw, 0.8rem);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #d9dbe4;
}

.page-main {
  max-width: 70rem;
  margin: 0 auto;
  padding: 1.25rem 1rem 2.2rem;
}

.intro,
.demo-list,
.resource-list {
  margin: 0;
  padding: 1.2rem;
  border: 1px solid var(--surface-border);
  border-radius: 0.8rem;
  background: var(--surface);
}

.intro {
  margin-bottom: 1rem;
}

.intro h1,
.demo-list h2,
.resource-list h2 {
  margin: 0 0 0.6rem;
}

.intro h1 {
  font-size: clamp(1.35rem, 3vw, 1.9rem);
}

.intro p {
  margin: 0;
  color: var(--text-muted);
}

.intro p + p {
  margin-top: 0.75rem;
}

.demo-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
  grid-template-columns: 1fr;
}

.demo-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 1rem;
  border: 1px solid var(--surface-border);
  border-radius: 0.75rem;
  background: #f9fbfc;
}

.demo-card-title {
  margin: 0;
  color: var(--accent-strong);
}

.demo-card p {
  margin: 0.55rem 0 0.8rem;
  color: var(--text-muted);
}

.demo-card-action {
  display: inline-flex;
  align-self: flex-start;
  margin-top: auto;
  padding: 0.4rem 0.7rem;
  border-radius: 0.45rem;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
}

.demo-card-action:hover {
  background: var(--accent-strong);
}

.demo-card-action:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--focus-ring-inner), 0 0 0 5px var(--focus-ring-outer);
}

.empty-state {
  margin: 0;
  padding: 1rem;
  border-radius: 0.6rem;
  background: #f5f8fa;
  color: var(--text-muted);
}

.resource-list {
  margin-top: 1rem;
}

.resource-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
  grid-template-columns: 1fr;
}

.resource-card {
  height: 100%;
  padding: 1rem;
  border: 1px solid var(--surface-border);
  border-radius: 0.75rem;
  background: linear-gradient(180deg, #f9fbfc 0%, #f4f8fa 100%);
}

.resource-card-title {
  margin: 0;
  font-size: 1.05rem;
}

.resource-card-link {
  color: var(--accent-strong);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.16em;
}

.resource-card-link:hover {
  color: var(--accent);
}

.resource-card-link:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--focus-ring-inner), 0 0 0 5px var(--focus-ring-outer);
}

.resource-card p {
  margin: 0.55rem 0 0;
  color: var(--text-muted);
}

@media (min-width: 42rem) {
  .page-main {
    padding-top: 1.5rem;
  }

  .demo-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .resource-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 64rem) {
  .resource-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}