:root {
  color-scheme: dark;
  --bg: #050505;
  --panel: #0f1012;
  --panel-border: #1f2228;
  --text: #f5f5f5;
  --muted: #9aa3ad;
  --layer-a: #ff6b6b;
  --layer-b: #4ecdc4;
  --layer-c: #00a638;
  --layer-d: #f9ca24;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: radial-gradient(circle at top, #0d0f13, #050505 55%, #030303 100%);
  color: var(--text);
  font-family: "Space Grotesk", "Segoe UI", "Trebuchet MS", sans-serif;
  min-height: 100vh;
}

.app {
  display: grid;
  grid-template-columns: minmax(240px, 320px) 1fr;
  min-height: 100vh;
}

.controls {
  padding: 32px 28px;
  border-right: 1px solid var(--panel-border);
  background: linear-gradient(180deg, rgba(18, 20, 24, 0.92), rgba(8, 8, 10, 0.92));
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.brand .title {
  font-size: 20px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.brand .subtitle {
  margin-top: 6px;
  color: var(--muted);
  font-size: 13px;
}

.rhythm-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.layer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  padding: 10px 12px;
  border-radius: 10px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.layer-row label {
  font-size: 14px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.layer-row input {
  width: 70px;
  padding: 6px 8px;
  border-radius: 8px;
  border: 1px solid #2a2f38;
  background: #07080a;
  color: var(--text);
  font-size: 15px;
  text-align: right;
}

.layer-row.is-active {
  box-shadow: 0 0 18px rgba(255, 255, 255, 0.12);
  border-color: #dfe5ee;
}

.layer-a.is-active { border-color: var(--layer-a); }
.layer-b.is-active { border-color: var(--layer-b); }
.layer-c.is-active { border-color: var(--layer-c); }
.layer-d.is-active { border-color: var(--layer-d); }

.actions {
  display: flex;
  gap: 10px;
}

button {
  cursor: pointer;
  border-radius: 999px;
  border: 1px solid #2a2f38;
  padding: 10px 16px;
  background: #12141a;
  color: var(--text);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

button.primary {
  border-color: #ffffff;
  background: #ffffff;
  color: #050505;
}

.status {
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
}

.stage {
  position: relative;
  display: flex;
  align-items: stretch;
  justify-content: stretch;
  padding: 0;
}

#animation-canvas {
  width: 100%;
  height: 100%;
  display: block;
  background: #000;
}

@media (max-width: 900px) {
  .app {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
  }

  .controls {
    border-right: none;
    border-bottom: 1px solid var(--panel-border);
  }
}