:root {
  color-scheme: dark;
  --bg: #080914;
  --panel: #15182b;
  --line: #3d4368;
  --text: #eef1ff;
  --muted: #aeb4d7;
  --accent: #5ff0ff;
}

* {
  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 20% -10%, rgba(95, 240, 255, 0.2), transparent 38%),
    radial-gradient(circle at 85% 0%, rgba(244, 109, 255, 0.16), transparent 35%),
    linear-gradient(180deg, #101428 0%, var(--bg) 100%);
}

.deck {
  width: min(980px, 95vw);
  margin: 1.5rem auto 2.5rem;
  display: grid;
  gap: 0.9rem;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.035), rgba(255, 255, 255, 0));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
  padding: 1rem 1.1rem;
}

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

h1 {
  margin: 0.34rem 0 0;
  font-size: clamp(1.56rem, 4vw, 2.34rem);
}

.subtitle {
  margin: 0.5rem 0 0;
  color: var(--muted);
  max-width: 68ch;
}

.controls {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: end;
}

label {
  display: grid;
  gap: 0.34rem;
  font-size: 0.84rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

select,
input[type="text"],
input[type="color"] {
  width: 100%;
  border-radius: 10px;
  border: 1px solid #465079;
  background: #12182b;
  color: var(--text);
  font: inherit;
  padding: 0.58rem 0.68rem;
}

input[type="color"] {
  height: 42px;
  padding: 0.18rem;
}

.button-row {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 0.52rem;
}

button {
  border-radius: 10px;
  border: 1px solid #47527d;
  background: #1a2038;
  color: var(--text);
  font: inherit;
  padding: 0.58rem 0.95rem;
  cursor: pointer;
  transition: transform 90ms ease, filter 110ms ease;
}

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

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

button.primary {
  border-color: #13b8c8;
  color: #032128;
  font-weight: 700;
  background: linear-gradient(180deg, #68f4ff, #18a3ba);
}

.hint {
  grid-column: 1 / -1;
  margin: -0.2rem 0 0;
  font-size: 0.88rem;
  color: var(--muted);
}

.canvas-panel {
  display: grid;
  place-items: center;
  padding: 1rem;
}

canvas {
  width: min(640px, 100%);
  height: auto;
  border-radius: 18px;
  border: 2px solid #5f6da0;
  background: #0a0e1d;
  box-shadow:
    0 0 0 4px rgba(255, 255, 255, 0.06),
    0 20px 34px rgba(0, 0, 0, 0.35);
  touch-action: none;
}

.notes h2 {
  margin: 0;
  font-size: 1.05rem;
}

.notes ul {
  margin: 0.55rem 0 0;
  padding-left: 1.05rem;
  display: grid;
  gap: 0.3rem;
}

.back-link {
  display: inline-block;
  margin-top: 0.8rem;
  color: #98f9ff;
  text-decoration: none;
}

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

@media (max-width: 860px) {
  .controls {
    grid-template-columns: 1fr;
  }

  .hint {
    margin-top: 0;
  }
}