:root {
  --bg: #1d2024;
  --card: #2b2f33;
  --line: #3b4046;
  --text: #e6e6e6;
  --muted: #9aa0a6;
  --housing: #111;
  --red-on: #ff3b30;
  --yellow-on: #ffcc00;
  --green-on: #34c759;
  --red-off: #3a1414;
  --yellow-off: #3a3210;
  --green-off: #123a1c;
  --ok: #4cd964;
  --error: #ff6b61;
  --accent: #ff9f0a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.4 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 24px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
}

h1 { font-size: 18px; margin: 0; }
h1 span { color: var(--muted); font-weight: normal; }
h2 { font-size: 13px; margin: 0 0 10px; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; }

.phase b { font-size: 18px; font-family: ui-monospace, Menlo, Consolas, monospace; }

.pill {
  margin-left: auto;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--line);
  color: var(--muted);
  font-size: 12px;
}
.pill.ok { background: #183d22; color: var(--ok); }
.pill.error { background: #4a1b18; color: var(--error); }

select, button {
  font: inherit;
  color: var(--text);
  background: #1d2024;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 4px 8px;
}
button { cursor: pointer; }
button:hover { border-color: var(--muted); }
button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #1d2024;
  font-weight: 600;
  padding: 10px 16px;
  width: 100%;
}
button.primary:active { transform: translateY(1px); }

main {
  display: grid;
  grid-template-columns: 300px 1fr 1fr;
  gap: 12px;
  padding: 12px 16px 16px;
  max-width: 1400px;
  margin: 0 auto;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 14px;
  min-width: 0;
}

h1 a { font-size: 13px; font-weight: normal; color: var(--accent); }

/* alegerea studentului, doar pe serverul cursului */
.picker { grid-column: 1 / -1; max-width: 560px; justify-self: center; width: 100%; }
.picker label { display: block; margin-bottom: 8px; }
.picker-row { display: flex; gap: 8px; }
.picker input {
  flex: 1;
  min-width: 0;
  font: inherit;
  color: var(--text);
  background: #1d2024;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px 10px;
}
.picker button.primary { width: auto; }
.picker .hint { color: var(--muted); font-size: 12px; margin: 10px 0 0; }
code { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: .92em; }
body.picking main > .card:not(.picker),
body.picking header .device,
body.picking header .phase { display: none; }

.scene { grid-column: 1 / -1; padding: 0; overflow: hidden; }
.scene canvas { display: block; width: 100%; }

.signals { grid-row: span 2; }
.log { grid-column: 2 / -1; }

dl { display: grid; grid-template-columns: auto 1fr; gap: 6px 12px; margin: 0; }
dt { color: var(--muted); }
dd { margin: 0; font-variant-numeric: tabular-nums; }
dd.ok { color: var(--ok); }
dd.error { color: var(--error); font-weight: 600; }
dd.stale { color: var(--error); }

/* semafoarele mari */
.heads { display: flex; justify-content: space-around; align-items: flex-start; margin-bottom: 14px; }
.head-group { display: flex; flex-direction: column; align-items: center; gap: 8px; }
.head {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 8px;
  background: var(--housing);
  border-radius: 12px;
}
.lamp {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  transition: background-color .08s, box-shadow .08s;
}
.lamp svg { width: 22px; height: 36px; fill: rgba(0, 0, 0, .4); }
.lamp.red { background: var(--red-off); }
.lamp.yellow { background: var(--yellow-off); }
.lamp.green { background: var(--green-off); }
.lamp.red.on { background: var(--red-on); box-shadow: 0 0 18px var(--red-on); }
.lamp.yellow.on { background: var(--yellow-on); box-shadow: 0 0 18px var(--yellow-on); }
.lamp.green.on { background: var(--green-on); box-shadow: 0 0 18px var(--green-on); }

.ped-row { display: flex; align-items: flex-end; gap: 6px; }
.countdown {
  width: 52px;
  height: 52px;
  margin-bottom: 8px;
  display: grid;
  place-items: center;
  background: var(--housing);
  border-radius: 8px;
  color: var(--green-on);
  font: bold 30px ui-monospace, Menlo, Consolas, monospace;
}
.wait-lamp {
  padding: 6px 10px;
  background: var(--housing);
  border-radius: 8px;
  color: var(--yellow-off);
  font-weight: 700;
  letter-spacing: .04em;
}
.wait-lamp.on { color: var(--yellow-on); text-shadow: 0 0 10px var(--yellow-on); }
.caption { color: var(--muted); }

.controls { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; margin-top: 14px; }
.controls label { color: var(--muted); }
.controls .check { display: flex; align-items: center; gap: 6px; }

.log pre {
  margin: 0;
  height: 180px;
  overflow-y: auto;
  font: 12px/1.45 ui-monospace, Menlo, Consolas, monospace;
  color: #c8c8c8;
  white-space: pre-wrap;
}
.log .error { color: var(--error); }

@media (max-width: 900px) {
  main { grid-template-columns: 1fr; }
  .signals { grid-row: auto; }
  .log { grid-column: auto; }
}