:root {
  color-scheme: dark;
  --bg: #000;
  --fg: #f0f0f0;
  --muted: #888;
  --ok: #4ade80;
  --warn: #facc15;
  --err: #f87171;
  --gap: 4px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--fg);
  font: 14px/1.3 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  overflow: hidden;
}

#grid {
  display: grid;
  width: 100vw;
  height: 100vh;
  gap: var(--gap);
  padding: var(--gap);
  grid-template-columns: repeat(var(--cols, 1), 1fr);
  grid-auto-rows: 1fr;
}

.tile {
  position: relative;
  background: #0a0a0a;
  overflow: hidden;
  margin: 0;
  border-radius: 2px;
  cursor: pointer;
}

.tile:focus-visible {
  outline: 2px solid var(--fg);
  outline-offset: -2px;
}

.tile video {
  width: 100%;
  height: 100%;
  background: #000;
  display: block;
}

/* aspect: fit (default) | fill | cover */
body[data-aspect="fit"]   .tile video { object-fit: contain; }
body[data-aspect="fill"]  .tile video { object-fit: fill; }
body[data-aspect="cover"] .tile video { object-fit: cover; }

.tile .overlay {
  position: absolute;
  inset: auto 0 0 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 10px;
  background: linear-gradient(to top, rgba(0,0,0,0.6), transparent);
  font-size: 12px;
  letter-spacing: 0.02em;
  pointer-events: none;
  transition: opacity 0.2s;
}

/* labels: on (always) | off (never) | hover (default) */
body[data-labels="on"]    .tile .overlay { opacity: 1; }
body[data-labels="off"]   .tile .overlay { opacity: 0; }
body[data-labels="hover"] .tile .overlay { opacity: 0; }
body[data-labels="hover"] .tile:hover .overlay,
body[data-labels="hover"] .tile:focus-within .overlay,
body[data-labels="hover"] .tile[data-state="error"] .overlay,
body[data-labels="hover"] .tile[data-state="connecting"] .overlay { opacity: 1; }

.tile .label {
  font-weight: 600;
  color: var(--fg);
  text-shadow: 0 1px 2px rgba(0,0,0,0.8);
}

.tile .state {
  color: var(--muted);
  font-variant: tabular-nums;
}

.tile[data-state="live"] .state { color: var(--ok); }
.tile[data-state="connecting"] .state { color: var(--warn); }
.tile[data-state="error"] .state { color: var(--err); }

/* debug=1: small top-left readout per tile */
.tile .debug {
  position: absolute;
  top: 4px;
  left: 6px;
  font-size: 10px;
  color: var(--muted);
  background: rgba(0,0,0,0.4);
  padding: 1px 4px;
  border-radius: 2px;
  pointer-events: none;
  display: none;
  font-variant: tabular-nums;
}
body[data-debug="1"] .tile .debug { display: inline-block; }

/* clock=on: top-right corner, monospaced */
#clock {
  position: fixed;
  top: 8px;
  right: 12px;
  font-variant: tabular-nums;
  font-size: 14px;
  color: var(--fg);
  background: rgba(0,0,0,0.4);
  padding: 2px 8px;
  border-radius: 2px;
  pointer-events: none;
  z-index: 5;
}

#status {
  position: fixed;
  inset: 50% 0 auto 0;
  transform: translateY(-50%);
  text-align: center;
  color: var(--muted);
  pointer-events: none;
}

#status[data-tone="error"] { color: var(--err); }

/* Fullscreen toggle — bottom-right, fades in on mouse activity */
#fs-btn {
  position: fixed;
  right: 12px;
  bottom: 12px;
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  margin: 0;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 4px;
  background: rgba(0,0,0,0.45);
  color: var(--fg);
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.2s, background 0.15s, border-color 0.15s;
  z-index: 6;
}

body[data-cursor="active"] #fs-btn,
#fs-btn:hover,
#fs-btn:focus-visible {
  opacity: 0.9;
}

#fs-btn:hover { background: rgba(0,0,0,0.7); border-color: rgba(255,255,255,0.35); }
#fs-btn:focus-visible { outline: 2px solid var(--fg); outline-offset: 2px; }

#fs-btn .fs-exit { display: none; }
body.is-fullscreen #fs-btn .fs-enter { display: none; }
body.is-fullscreen #fs-btn .fs-exit  { display: inline; }