:root {
  color-scheme: dark;
  --bg: #070a16;
  --panel: #121936;
  --line: #395184;
  --text: #edf4ff;
  --muted: #a4b9da;
  --cyan: #61eaff;
  --mint: #a8ff9e;
  --pink: #ff8be0;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 14% -8%, rgba(97, 234, 255, 0.18), transparent 35%),
    radial-gradient(circle at 85% -10%, rgba(255, 139, 224, 0.16), transparent 36%),
    linear-gradient(180deg, #111735 0%, var(--bg) 100%);
}

.deck {
  width: min(1040px, 94vw);
  margin: 1.8rem auto 2.4rem;
  display: grid;
  gap: 0.95rem;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
  padding: 1rem 1.1rem;
}

.kicker {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.72rem;
  color: var(--cyan);
}

h1 {
  margin: 0.3rem 0 0;
  font-size: clamp(1.55rem, 4vw, 2.3rem);
}

.subtitle {
  margin: 0.45rem 0 0;
  color: var(--muted);
  max-width: 68ch;
}

.controls {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
  align-items: end;
}

label {
  display: grid;
  gap: 0.3rem;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

input[type="range"],
select {
  width: 100%;
}

input[type="range"] {
  accent-color: var(--cyan);
}

select {
  border-radius: 10px;
  border: 1px solid #3f5788;
  background: #121e35;
  color: var(--text);
  padding: 0.48rem 0.55rem;
  font: inherit;
}

.buttons {
  grid-column: span 2;
  display: flex;
  gap: 0.55rem;
  flex-wrap: wrap;
}

button {
  border: 1px solid #3f5c8f;
  border-radius: 10px;
  background: #15233c;
  color: var(--text);
  font: inherit;
  padding: 0.56rem 0.9rem;
  cursor: pointer;
  transition: filter 120ms ease, transform 90ms ease;
}

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

button:active {
  transform: translateY(1px);
}

button.primary {
  border-color: #06b1be;
  background: linear-gradient(180deg, #64f3ff, #1196ab);
  color: #07222e;
  font-weight: 700;
}

.status {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.6rem;
}

.status div {
  border: 1px solid #344b79;
  border-radius: 10px;
  padding: 0.55rem 0.65rem;
  background: rgba(9, 16, 35, 0.45);
  display: grid;
  gap: 0.22rem;
}

.status span {
  color: var(--muted);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.status strong {
  font-size: 1.14rem;
}

.display {
  display: grid;
  gap: 0.5rem;
}

canvas {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
  border: 2px solid #4a6698;
  background: #05090f;
}

.hint {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.notes h2 {
  margin: 0;
  font-size: 1.04rem;
}

.notes ul {
  margin: 0.55rem 0 0;
  padding-left: 1.12rem;
  display: grid;
  gap: 0.32rem;
}

.back-link {
  display: inline-block;
  margin-top: 0.8rem;
  color: #9cf6ff;
  text-decoration: none;
}

.back-link:hover {
  text-decoration: underline;
}

@media (max-width: 760px) {
  .controls,
  .status {
    grid-template-columns: 1fr;
  }

  .buttons {
    grid-column: span 1;
  }
}