:root {
  --bg: #0a0a0a;
  --fg: #f4f4f4;
  --muted: rgba(255, 255, 255, 0.62);
  --line: rgba(255, 255, 255, 0.12);
  --signal: #ffd900;
  --signal-ink: #0a0a0a;
  --radius: 10px;
  --font: "Bricolage Grotesque", "Montserrat", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

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

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
}

a {
  color: var(--signal);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.hidden {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--line);
  background: rgba(10, 10, 10, 0.92);
  backdrop-filter: blur(10px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--fg);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand:hover {
  text-decoration: none;
}

.brand img {
  width: 2rem;
  height: auto;
}

.header-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.45rem 0.9rem;
  font: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  background: transparent;
  color: var(--fg);
  transition: border-color 0.15s, background 0.15s;
}

.btn:hover {
  border-color: rgba(255, 255, 255, 0.35);
}

.btn-primary {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--signal-ink);
}

.btn-primary:hover {
  filter: brightness(1.05);
  text-decoration: none;
}

.btn-ghost {
  font-weight: 500;
}

.page {
  max-width: 72rem;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

.page-intro {
  max-width: 42rem;
  margin-bottom: 2rem;
}

.page-intro h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  letter-spacing: -0.03em;
}

.page-intro p {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.demo-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.demo-card {
  aspect-ratio: 1;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #111;
}

.demo-card-thumb {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: inherit;
  cursor: pointer;
  background: #111;
  overflow: hidden;
}

.demo-card-thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}

.demo-card-thumb:hover img,
.demo-card-thumb:focus-visible img {
  transform: scale(1.06);
}

.demo-card-thumb:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

.demo-card-thumb-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.35);
  background: linear-gradient(145deg, #1a1a1a, #0d0d0d);
}

.demo-card-title {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: flex;
  align-items: flex-end;
  padding: 1rem 1rem 3.25rem;
  font-size: clamp(0.95rem, 2.5vw, 1.15rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
  text-align: left;
  color: #fff;
  background: linear-gradient(
    to top,
    rgba(0, 0, 0, 0.82) 0%,
    rgba(0, 0, 0, 0.45) 45%,
    transparent 100%
  );
  opacity: 0;
  transition: opacity 0.25s ease;
  pointer-events: none;
}

.demo-card-thumb:hover .demo-card-title,
.demo-card-thumb:focus-visible .demo-card-title {
  opacity: 1;
}

.demo-card-play-label {
  position: absolute;
  z-index: 2;
  inset: auto auto 0.75rem 0.75rem;
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  background: var(--signal);
  color: var(--signal-ink);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  pointer-events: none;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
}

.status-banner {
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(255, 217, 0, 0.08);
  color: var(--fg);
  margin-bottom: 1.5rem;
}

.status-banner.error {
  border-color: rgba(255, 90, 70, 0.5);
  background: rgba(255, 90, 70, 0.1);
}

/* Full-screen player */
.player-shell {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  flex-direction: column;
  background: #000;
}

.player-bar {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.55rem 0.85rem;
  border-bottom: 1px solid var(--line);
  background: rgba(10, 10, 10, 0.95);
}

.player-title {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.player-frame-wrap {
  flex: 1;
  min-height: 0;
  position: relative;
  background: #000;
}

.player-frame-wrap iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
  background: #000;
}

.player-loading {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--muted);
  pointer-events: none;
}

@media (max-width: 900px) {
  .demo-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .site-header {
    flex-wrap: wrap;
  }

  .demo-grid {
    grid-template-columns: 1fr;
  }

  .player-bar {
    flex-wrap: wrap;
  }
}