:root {
  color-scheme: light dark;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", system-ui, sans-serif;
  background: #f5f5f7;
  color: #161617;
  --surface: #fff;
  --surface-2: #eeeef2;
  --line: #d9d9df;
  --muted: #686870;
  --accent: #3973e8;
  --accent-soft: #e8efff;
  --warning: #b85b00;
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: var(--background, #f5f5f7); }
header {
  position: sticky; top: 0; z-index: 10;
  display: flex; gap: 2rem; align-items: center;
  min-height: 4.25rem; padding: .75rem clamp(1rem, 4vw, 3rem);
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  border-bottom: 1px solid var(--line); backdrop-filter: blur(18px);
}
header strong { font-size: 1.15rem; letter-spacing: -.02em; }
nav { display: flex; gap: .35rem; flex-wrap: wrap; }
nav a { padding: .6rem .85rem; border-radius: .75rem; color: inherit; text-decoration: none; }
nav a:hover { background: var(--surface-2); }
nav a[aria-current=page] { background: var(--surface-2); font-weight: 650; }
main { max-width: 76rem; margin: 0 auto; padding: clamp(1.5rem, 4vw, 3.5rem); }
main > h1 { margin: 0; font-size: clamp(2.2rem, 5vw, 3.6rem); letter-spacing: -.045em; }
main section { margin-top: 2.5rem; }
main section h2 { margin: 0 0 1rem; font-size: 1.55rem; letter-spacing: -.025em; }
.login { max-width: 28rem; padding-top: 12vh; }
.login h1 { font-size: 3rem; }
form { display: grid; gap: .75rem; margin: 2rem 0 1rem; }
input, button { font: inherit; padding: .8rem; border-radius: .75rem; border: 1px solid var(--line); }
button { cursor: pointer; background: var(--accent); color: #fff; border: 0; font-weight: 650; }
button:disabled { cursor: not-allowed; opacity: .45; }
.freshness { display: inline-flex; margin: .9rem 0 0; padding: .38rem .65rem; border-radius: 999px; background: var(--surface-2); font-size: .9rem; }
main[data-freshness=stale] .freshness { color: var(--warning); }
.tiles { display: grid; grid-template-columns: repeat(auto-fill, minmax(13.5rem, 1fr)); gap: .85rem; }
.tile {
  position: relative; display: flex; flex-direction: column; min-height: 10.5rem;
  padding: 1.15rem; border: 1px solid color-mix(in srgb, var(--line) 65%, transparent);
  border-radius: 1.25rem; background: var(--surface); box-shadow: 0 3px 14px #0000000b;
}
.tile::before { content: ""; width: 2rem; height: 2rem; margin-bottom: .8rem; border-radius: 50%; background: var(--surface-2); }
.tile[data-kind=light]::before { content: "●"; display:grid; place-items:center; color:#f5a623; background:#fff3d8; }
.tile[data-kind=scene]::before { content: "✦"; display:grid; place-items:center; color:#7658d6; background:#eee9ff; }
.tile[data-kind=sensor]::before { content: "↗"; display:grid; place-items:center; color:#28866f; background:#def5ee; }
.tile h3 { margin: 0; font-size: 1.05rem; line-height: 1.25; letter-spacing: -.015em; }
.tile .state { margin: .4rem 0 1rem; color: var(--muted); font-size: 1rem; }
.tile .action { align-self: flex-start; margin-top: auto; padding: .55rem .8rem; font-size: .9rem; }
.brightness { width: 100%; margin-top: .8rem; padding: 0; accent-color: var(--accent); }
.muted, #status { color: var(--muted); }
ul { line-height: 1.7; }
@media (prefers-reduced-motion:no-preference) {
  .tile, button { transition: transform .15s ease, filter .15s ease, box-shadow .15s ease; }
  .tile:has(.action:not(:disabled)):hover { transform: translateY(-2px); box-shadow: 0 8px 24px #0001; }
  button:hover { filter: brightness(1.08); }
}
@media (max-width: 700px) {
  header { align-items: flex-start; gap: .75rem; flex-direction: column; }
  nav { width: 100%; overflow-x: auto; flex-wrap: nowrap; padding-bottom: .15rem; }
  nav a { white-space: nowrap; }
  main { padding: 1.5rem 1rem 5rem; }
  .tiles { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tile { min-height: 9.5rem; }
}
@media (prefers-color-scheme:dark) {
  :root { --background:#101012; --surface:#1c1c1f; --surface-2:#303035; --line:#38383d; --muted:#aaaab3; --accent:#5d84ef; --accent-soft:#1d315f; --warning:#ff9a43; color:#f5f5f7; }
  .tile[data-kind=light]::before { background:#4a3917; }
  .tile[data-kind=scene]::before { background:#342b54; }
  .tile[data-kind=sensor]::before { background:#183d34; }
}