:root {
  --bg: #060612;
  --panel: #0d1020;
  --line: #232b4f;
  --text: #e9eeff;
  --muted: #aeb9df;
  --cyan: #1df2ff;
  --pink: #ff3eb5;
  --lime: #7cff8b;
  --amber: #ffcb5a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 15% 10%, #152658 0%, transparent 36%),
    radial-gradient(circle at 85% 90%, #3b1247 0%, transparent 40%),
    var(--bg);
  color: var(--text);
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
}

.app {
  width: min(1020px, 96vw);
  margin: 0 auto;
  padding: 1rem 0 2rem;
}

.topbar h1 {
  margin: 0.35rem 0;
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  letter-spacing: 0.05em;
  text-shadow: 0 0 16px rgba(29, 242, 255, 0.45);
}

.topbar p {
  margin: 0;
  color: var(--muted);
}

.back {
  display: inline-block;
  color: var(--cyan);
  text-decoration: none;
  border: 1px solid rgba(29, 242, 255, 0.45);
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
  font-size: 0.86rem;
}

.hud {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.7rem;
}

.panel {
  background: rgba(8, 12, 26, 0.9);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.65rem 0.8rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.8rem;
}

.panel span {
  font-size: 0.8rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.panel strong {
  font-size: 1rem;
  color: var(--text);
}

.panel.wide {
  grid-column: span 1;
  display: grid;
  gap: 0.35rem;
}

.bar {
  width: 100%;
  height: 9px;
  background: #1a1f36;
  border-radius: 999px;
  overflow: hidden;
}

#pressure-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--lime), var(--amber), var(--pink));
  transition: width 0.15s linear;
}

.stage {
  margin-top: 0.9rem;
  background: #050912;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.65rem;
  box-shadow: inset 0 0 28px rgba(29, 242, 255, 0.08);
}

canvas {
  width: 100%;
  height: auto;
  border-radius: 10px;
  display: block;
  background: #090d18;
}

.controls {
  margin-top: 0.9rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

button {
  background: linear-gradient(180deg, #16244f, #111a39);
  color: var(--text);
  border: 1px solid #2f3f76;
  border-radius: 10px;
  padding: 0.6rem 0.95rem;
  cursor: pointer;
  font-weight: 600;
}

button:hover {
  filter: brightness(1.08);
}

.tips {
  margin-top: 0.85rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.tips ul {
  margin: 0;
  padding-left: 1.1rem;
  display: grid;
  gap: 0.35rem;
}

@media (max-width: 760px) {
  .hud { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .panel.wide { grid-column: span 2; }
}