:root {
  --bg: #070707;
  --panel: rgba(14, 14, 14, 0.56);
  --amber: #ff9e2c;
  --amber-soft: #ffbf74;
  --text: #f7efe4;
  --muted: #c39e71;
  --danger: #ff5a5a;
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at center, #16110b 0%, var(--bg) 54%);
  color: var(--text);
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

.app {
  position: fixed;
  inset: 0;
  overflow: hidden;
}

#reactor {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.hud {
  position: absolute;
  z-index: 2;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: min(92vw, 520px);
  padding: 16px;
  text-align: center;
  background: var(--panel);
  border: 1px solid rgba(255, 173, 90, 0.14);
  border-radius: 22px;
  backdrop-filter: blur(4px);
}

.top-row {
  display: flex;
  justify-content: space-between;
  gap: 8px;
}

.pill {
  border: 1px solid rgba(255, 176, 100, 0.35);
  color: var(--amber-soft);
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 12px;
  letter-spacing: 0.06em;
}

.pill.subtle { opacity: 0.85; }

h1 {
  margin: 14px 0 6px;
  font-size: clamp(1.4rem, 7vw, 2rem);
  letter-spacing: 0.18em;
}

#subtitle {
  margin: 0 0 14px;
  color: var(--muted);
  min-height: 2.5em;
}

.controls {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.btn {
  border: 1px solid rgba(255, 176, 100, 0.45);
  background: rgba(20, 20, 20, 0.8);
  color: var(--text);
  border-radius: 12px;
  padding: 10px 14px;
  font-weight: 600;
  cursor: pointer;
}

.btn.primary {
  background: rgba(255, 145, 33, 0.2);
}

.btn:active { transform: scale(0.98); }

body.state-error .pill,
body.state-error .btn.primary {
  border-color: rgba(255, 80, 80, 0.7);
  color: #ffc4c4;
}

.settings {
  margin-top: 14px;
  border: 1px solid rgba(255, 173, 90, 0.2);
  border-radius: 12px;
  padding: 10px;
  text-align: left;
  background: rgba(0, 0, 0, 0.25);
}

.hidden { display: none; }

.settings h2 {
  margin: 0 0 8px;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--amber-soft);
}

.settings-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr auto;
  gap: 8px;
  margin-bottom: 8px;
}

.settings input,
.settings select {
  width: 100%;
  border: 1px solid rgba(255, 173, 90, 0.25);
  background: rgba(10, 10, 10, 0.8);
  color: var(--text);
  border-radius: 8px;
  padding: 8px;
}

.settings-message {
  min-height: 18px;
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 8px;
}

.connections-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.connections-list li {
  border: 1px solid rgba(255, 173, 90, 0.2);
  border-radius: 10px;
  padding: 8px;
}

.conn-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

.conn-meta {
  font-size: 12px;
  color: var(--muted);
}

@media (max-width: 700px) {
  .settings-row {
    grid-template-columns: 1fr;
  }
}