:root {
  color-scheme: light;
  font-family:
    system-ui,
    -apple-system,
    sans-serif;
  --border: #d4d4d8;
  --muted: #71717a;
  --highlight: #fbbf24;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: #fafafa;
  color: #18181b;
}

header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  background: #fff;
}

header h1 {
  font-size: 1.25rem;
  margin: 0;
}

#connect {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.875rem;
}

#connect:hover {
  background: #f4f4f5;
}

#connect[data-state='connected'] {
  background: #ef4444;
  color: white;
  border-color: #ef4444;
}

main {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  padding: 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

.phone-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  /* Tall enough that, combined with N rows, the bottom of the grid
     scrolls below typical viewport heights — exercises offscreen
     detection and scroll_to. */
  min-height: 130px;
  scroll-margin-top: 5rem;
  /* Position relative + z-index so the lifted card during the
     highlight pulse renders above its neighbors. */
  position: relative;
  z-index: 0;
}

.phone-card h2 {
  margin: 0 0 0.25rem;
  font-size: 1rem;
}

.phone-card .brand {
  margin: 0 0 0.5rem;
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.phone-card .desc {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.45;
  color: #3f3f46;
}

/* Highlight pulse: card scales up briefly, glows, tints, then
   settles back. The animation duration is keyed off a CSS variable
   so the handler can drive it from the server-supplied ``duration_ms``.
   The visual restyle is entirely client-side — ``highlight`` is
   just a command name, the page decides what "highlight" looks like. */
@keyframes ui-highlight-pulse {
  0% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(251, 191, 36, 0);
    background: #fff;
    border-color: var(--border);
  }
  35% {
    transform: scale(1.04);
    box-shadow: 0 0 36px 8px rgba(251, 191, 36, 0.55);
    background: #fffbeb;
    border-color: var(--highlight);
  }
  100% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(251, 191, 36, 0);
    background: #fff;
    border-color: var(--border);
  }
}

.ui-highlight {
  animation: ui-highlight-pulse var(--highlight-duration, 2500ms)
    cubic-bezier(0.2, 0.8, 0.2, 1);
  z-index: 2;
}

#status {
  position: fixed;
  bottom: 1rem;
  right: 1rem;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  font-size: 0.8125rem;
  background: #18181b;
  color: white;
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
}

#status[data-show='1'] {
  opacity: 1;
}