:root {
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #070914;
  color: #f5f7fb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(119, 247, 197, 0.22), transparent 34rem),
    radial-gradient(circle at bottom right, rgba(168, 85, 247, 0.22), transparent 30rem),
    #070914;
}

main {
  width: min(1040px, calc(100% - 32px));
  margin: 0 auto;
  padding: 56px 0;
}

.hero {
  margin-bottom: 28px;
}

.eyebrow {
  margin: 0 0 10px;
  color: #77f7c5;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(3rem, 8vw, 6.5rem);
  line-height: 0.92;
}

.hero p:last-child {
  max-width: 680px;
  color: #c8d0e7;
  font-size: 1.15rem;
  line-height: 1.7;
}

.panel,
.notes {
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 24px;
  background: rgba(12, 16, 31, 0.74);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.32);
  backdrop-filter: blur(18px);
}

.panel {
  padding: 20px;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 18px;
  margin-bottom: 18px;
}

button {
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  background: #77f7c5;
  color: #071014;
  cursor: pointer;
  font: inherit;
  font-weight: 800;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.42;
}

label {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #c8d0e7;
}

input[type="range"],
input[type="radio"] {
  accent-color: #77f7c5;
}

.edit-mode {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
  margin: 0 0 18px;
  padding: 12px 14px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 16px;
}

.edit-mode legend {
  padding: 0 8px;
  color: #77f7c5;
  font-weight: 800;
}

.visual-stack {
  display: grid;
  gap: 18px;
}

.visual-stack h2 {
  margin: 0 0 10px 4px;
  color: #f5f7fb;
  font-size: 1rem;
}

canvas {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 18px;
  background: #10131f;
}

.melody-status,
.status {
  margin: 14px 4px 0;
  color: #9aa4bf;
}

.melody-status {
  margin-bottom: 18px;
}

#eulerGraph,
#pianoKeyboard,
#guitarNeck {
  cursor: pointer;
}

.notes {
  margin-top: 22px;
  padding: 18px 24px;
  color: #c8d0e7;
  line-height: 1.7;
}

.notes h2 {
  color: #f5f7fb;
}

code {
  color: #ffdf6b;
}