:root {
  color-scheme: dark;
  --bg: #050912;
  --panel: rgba(7, 12, 28, 0.85);
  --accent: #5ef2c8;
  --accent-muted: rgba(94, 242, 200, 0.3);
  --text: #d8f6ff;
  --subtle: rgba(216, 246, 255, 0.65);
  --grid-line: rgba(94, 242, 200, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "IBM Plex Mono", "Fira Mono", "Source Code Pro", monospace;
  background: radial-gradient(circle at top, #0f2c44 0%, #040611 65%);
  color: var(--text);
  display: flex;
  justify-content: center;
  align-items: center;
  padding: clamp(1.5rem, 4vw, 3rem);
}

.screen {
  width: min(960px, 92vw);
  display: grid;
  gap: 1.75rem;
}

.frame {
  border: 2px solid var(--accent-muted);
  border-radius: 1.25rem;
  background: var(--panel);
  padding: clamp(1.25rem, 3vw, 2rem);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(12px);
}

h1 {
  margin: 0 0 1rem;
  font-size: clamp(2.2rem, 6vw, 3.2rem);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

p {
  line-height: 1.75;
  margin: 0;
  color: var(--subtle);
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

button {
  cursor: pointer;
  font-family: inherit;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border: none;
  padding: 0.75rem 1.75rem;
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(94, 242, 200, 0.9), rgba(29, 187, 165, 0.85));
  color: #052227;
  transition: transform 160ms ease, box-shadow 160ms ease;
  box-shadow: 0 12px 22px rgba(2, 14, 20, 0.65);
}

button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

button:not(:disabled):hover,
button:not(:disabled):focus-visible {
  transform: translateY(-3px);
  box-shadow: 0 18px 28px rgba(3, 18, 26, 0.72);
  outline: none;
}

.volume {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  font-size: 0.95rem;
  letter-spacing: 0.05em;
}

input[type="range"] {
  width: clamp(10rem, 30vw, 16rem);
}

.anatomy ul {
  margin: 1rem 0 0;
  padding-left: 1.2rem;
  color: var(--subtle);
  line-height: 1.7;
}

.anatomy strong {
  color: var(--text);
}

.sequencer p {
  margin-bottom: 1.25rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(32, minmax(0, 1fr));
  grid-template-rows: repeat(3, auto);
  gap: 4px;
  border: 1px solid var(--grid-line);
  border-radius: 0.75rem;
  padding: 0.75rem;
  background: rgba(5, 8, 18, 0.65);
}

.grid span {
  position: relative;
  border-radius: 0.45rem;
  border: 1px solid transparent;
  min-height: 1.75rem;
  background: rgba(94, 242, 200, 0.07);
  transition: background 140ms ease, border-color 140ms ease, box-shadow 140ms ease;
}

.grid span[data-active="true"] {
  background: rgba(94, 242, 200, 0.4);
  border-color: rgba(94, 242, 200, 0.85);
  box-shadow: 0 0 12px rgba(94, 242, 200, 0.7);
}

footer p {
  text-align: center;
}

@media (max-width: 720px) {
  body {
    align-items: stretch;
  }

  .screen {
    width: 100%;
  }

  .grid {
    grid-template-columns: repeat(16, minmax(0, 1fr));
  }
}