:root {
  --bg: #0f1419;
  --card: #1a222d;
  --text: #e7ecf2;
  --muted: #8b98a6;
  --accent: #3d8bfd;
  --accent-hover: #5ca0ff;
  --danger: #e5534b;
  --danger-hover: #f06d66;
  --radius: 12px;
  --font: "Segoe UI", system-ui, -apple-system, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  background: radial-gradient(1200px 600px at 20% -10%, #1e3a5f 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #2a1f3d 0%, transparent 50%), var(--bg);
  color: var(--text);
}

.shell {
  max-width: 520px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem;
}

.header h1 {
  margin: 0 0 0.35rem;
  font-size: 1.65rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.sub {
  margin: 0;
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.45;
}

#bridge-target {
  color: var(--accent);
  font-weight: 500;
}

.card {
  margin-top: 1.75rem;
  padding: 1.35rem 1.25rem;
  background: var(--card);
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}

.row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.btn {
  font: inherit;
  font-weight: 600;
  padding: 0.55rem 1.1rem;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.08s ease;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn.primary {
  background: var(--accent);
  color: #fff;
}

.btn.primary:not(:disabled):hover {
  background: var(--accent-hover);
}

.btn.danger {
  background: var(--danger);
  color: #fff;
}

.btn.danger:not(:disabled):hover {
  background: var(--danger-hover);
}

.mute {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
}

.status {
  margin: 1rem 0 0;
  font-size: 0.9rem;
  min-height: 1.35rem;
}

.status.idle {
  color: var(--muted);
}

.status.ringing {
  color: #c9a227;
}

.status.live {
  color: #3ddc84;
}

.status.error {
  color: var(--danger);
}

#remote-audio {
  width: 100%;
  margin-top: 0.75rem;
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.25);
}

.footer {
  margin-top: 1.5rem;
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.4;
}