*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:       #0d0d0d;
  --surface:  #1a1a1a;
  --border:   #2a2a2a;
  --text:     #e0e0e0;
  --muted:    #555;
  --danger:   #e53e3e;
  --danger-h: #c53030;
  --safe:     #38a169;
  --safe-h:   #276749;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ── MQTT bar ───────────────────────────── */
.mqtt-bar {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: .5rem;
  padding: .75rem 1.5rem;
  font-size: .8rem;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
}

.dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--muted);
  transition: background .4s;
}
.dot.connected    { background: var(--safe); box-shadow: 0 0 5px var(--safe); }
.dot.disconnected { background: var(--danger); }

/* ── Cards ──────────────────────────────── */
main {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2.5rem;
  padding: 3rem 1.5rem;
  width: 100%;
  max-width: 440px;
}

.printer-card {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  transition: border-color .3s;
}

.printer-card.emergency { border-color: var(--danger); }

.printer-label {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: .05em;
  color: var(--muted);
  text-transform: uppercase;
}

.printer-status {
  font-size: .85rem;
  font-weight: 700;
  letter-spacing: .1em;
  padding: .3rem .9rem;
  border-radius: 20px;
  background: var(--border);
  color: var(--muted);
  transition: background .3s, color .3s;
}
.printer-status.on  { background: #1a3d2a; color: var(--safe); }
.printer-status.off { background: #3d1a1a; color: var(--danger); }

/* ── Emergency button ───────────────────── */
.emergency-btn {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  border: 6px solid var(--danger-h);
  background: var(--danger);
  color: #fff;
  font-size: 1rem;
  font-weight: 900;
  letter-spacing: .08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background .15s, transform .1s, border-color .3s;
  box-shadow: 0 0 24px rgba(229,62,62,.35);
}
.emergency-btn:hover:not(:disabled) { background: var(--danger-h); }
.emergency-btn:active:not(:disabled) { transform: scale(.95); }
.emergency-btn:disabled { opacity: .35; cursor: not-allowed; box-shadow: none; }

.emergency-btn.reset {
  background: var(--safe);
  border-color: var(--safe-h);
  box-shadow: 0 0 24px rgba(56,161,105,.3);
}
.emergency-btn.reset:hover:not(:disabled) { background: var(--safe-h); }