:root {
  --bg: #121212;
  --surface: #1e1e1e;
  --text: #f0f0f0;
  --muted: #a0a0a0;
  --accent: #ff6b35;
  --ok: #4caf50;
  --warn: #ff9800;
  --danger: #f44336;
  --radius: 12px;
  --shadow: 0 2px 8px rgba(0,0,0,0.4);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

header {
  background: var(--surface);
  padding: 1rem;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 10;
}

header h1 {
  margin: 0 0 0.5rem;
  font-size: 1.5rem;
  color: var(--accent);
}

#status-bar {
  display: flex;
  gap: 1rem;
  font-size: 0.9rem;
  color: var(--muted);
}

#status-bar .ok { color: var(--ok); }
#status-bar .warn { color: var(--warn); }
#status-bar .danger { color: var(--danger); }

main {
  padding: 1rem;
  max-width: 1200px;
  margin: 0 auto;
}

.panel {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: var(--shadow);
  margin-bottom: 1rem;
}

.panel h2 {
  margin-top: 0;
  font-size: 1.1rem;
  color: var(--accent);
}

#session-controls form {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

#session-controls input,
#session-controls textarea,
#session-controls select {
  background: #2a2a2a;
  border: 1px solid #333;
  color: var(--text);
  padding: 0.6rem;
  border-radius: 6px;
  font: inherit;
}

#session-controls textarea {
  min-height: 80px;
  resize: vertical;
}

#session-controls button {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 0.7rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  font-weight: bold;
}

#session-controls button:disabled {
  background: #444;
  cursor: not-allowed;
}

#end-session-btn {
  margin-top: 0.5rem;
  width: 100%;
}

#probe-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.probe-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--muted);
  transition: border-color 0.2s;
}

.probe-card.connected {
  border-left-color: var(--ok);
}

.probe-card .header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.probe-card .name {
  font-weight: bold;
  font-size: 1.1rem;
}

.probe-card .target {
  font-size: 0.85rem;
  color: var(--muted);
}

.probe-card .temp {
  font-size: 2.5rem;
  font-weight: 300;
  margin: 0.5rem 0;
}

.probe-card .temp.disconnected {
  color: var(--muted);
  font-size: 1.8rem;
}

.probe-card .footer {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--muted);
}

.setpoint-editor {
  margin-top: 0.75rem;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.setpoint-editor input {
  flex: 1;
  min-width: 80px;
  background: #2a2a2a;
  border: 1px solid #333;
  color: var(--text);
  padding: 0.4rem;
  border-radius: 4px;
}

.setpoint-editor button {
  background: #333;
  color: var(--text);
  border: 1px solid #444;
  padding: 0.4rem 0.7rem;
  border-radius: 4px;
  cursor: pointer;
}

.chart-controls {
  display: flex;
  gap: 1rem;
  align-items: center;
  margin-bottom: 1rem;
}

.chart-controls select,
.chart-controls button {
  background: #2a2a2a;
  border: 1px solid #333;
  color: var(--text);
  padding: 0.5rem;
  border-radius: 6px;
}

.chart-controls button {
  background: var(--accent);
  border: none;
  cursor: pointer;
}

footer {
  text-align: center;
  padding: 1rem;
  color: var(--muted);
  font-size: 0.85rem;
}

@media (max-width: 600px) {
  #status-bar { flex-direction: column; gap: 0.25rem; }
  .probe-card .temp { font-size: 2rem; }
}