:root {
  --bg: #ffffff;
  --fg: #1f1f1f;
  --muted: #5f6368;
  --card: #f8f9fa;
  --border: #dadce0;
  --accent: #4285f4;
  --accent-hover: #34a853;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17181a;
    --fg: #e8eaed;
    --muted: #9aa0a6;
    --card: #202124;
    --border: #3c4043;
  }
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family:
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    sans-serif;
  line-height: 1.6;
}
code,
pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.85em;
}
pre {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.9rem 1.1rem;
  overflow-x: auto;
}
a {
  color: var(--accent);
}
main,
.hero,
footer {
  max-width: 60rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}
.hero {
  padding-top: 4rem;
  padding-bottom: 2rem;
  text-align: center;
}
.hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.75rem);
  margin: 0.5rem 0;
}
.hero h1 em {
  font-style: italic;
  color: var(--accent);
}
.hero h1 .h1-tail {
  display: block;
  font-size: 0.55em;
  font-weight: 600;
  color: var(--muted);
  margin-top: 0.35rem;
}
.sub {
  color: var(--muted);
  max-width: 42rem;
  margin: 0 auto 1.5rem;
}
.badge-row {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  flex-wrap: wrap;
}
.badge {
  font-size: 0.75rem;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.15rem 0.7rem;
}
.hero-demo {
  margin: 1.5rem 0;
}

.demo-capture {
  width: min(100%, 952px);
  margin: 2rem auto 0;
}

.demo-capture img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 0.75rem;
}

.demo-capture figcaption {
  margin-top: 0.65rem;
  color: var(--muted);
  font-size: 0.9rem;
  text-align: left;
}
.cta-row {
  display: flex;
  gap: 1.25rem;
  justify-content: center;
  flex-wrap: wrap;
}
section {
  margin: 3.5rem 0;
}
h2 {
  font-size: 1.5rem;
}
.num {
  color: var(--accent);
  font-weight: 700;
  margin-right: 0.5rem;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 1rem;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.1rem;
  margin: 0;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}
.card-dark {
  background: #202124;
  color: #e8eaed;
}
.card-dark pre {
  background: #17181a;
  border-color: #3c4043;
  color: #e8eaed;
}
.card figcaption {
  color: var(--muted);
  font-size: 0.8rem;
  margin: 0.6rem 0;
}
.card-dark figcaption {
  color: #9aa0a6;
}
.demo-strip {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.5rem;
  margin-bottom: 1rem;
}

/* Static previews: pure HTML/CSS renderings that never depend on any script,
   so every gallery card shows a visible button even with the SDK blocked. */
.static-preview {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.6rem;
}
.mock-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-family:
    Roboto,
    system-ui,
    -apple-system,
    sans-serif;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.55em 1.1em;
  border-radius: 4px;
  line-height: 1.2;
  cursor: default;
  user-select: none;
}
.mock-light {
  background: #ffffff;
  color: #1f1f1f;
  border: 1px solid #dadce0;
}
.mock-dark {
  background: #202124;
  color: #e8eaed;
  border: 1px solid #5f6368;
}
.mock-icon {
  width: 1.1em;
  height: 1.1em;
  flex: none;
}
.preview-tag {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.05rem 0.5rem;
}
.card-dark .preview-tag {
  color: #9aa0a6;
  border-color: #3c4043;
}
/* Until the element upgrades (or if its script is blocked), the static
   preview is the card's button; hide the inert unknown element. */
preferred-source-button:not(:defined) {
  display: none;
}
.note p {
  margin: 0.6rem 0;
}
#event-console {
  width: 100%;
  background: var(--card);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.8rem;
  resize: vertical;
}
.tabs [role="tablist"] {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}
.tabs [role="tab"] {
  background: var(--card);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.35rem 1rem;
  cursor: pointer;
  font-size: 0.85rem;
}
.tabs [role="tab"][aria-selected="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
footer {
  border-top: 1px solid var(--border);
  margin-top: 4rem;
  padding-top: 1.5rem;
  padding-bottom: 3rem;
  color: var(--muted);
  font-size: 0.9rem;
}