* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-top: #0a0a0f;
  --bg-bottom: #16161f;
  --accent: #f59e0b;
  --accent-2: #fbbf24;
  --text: #f5f5f4;
  --muted: #a1a1aa;
  --pad: rgba(255, 255, 255, 0.06);
  --pad-border: rgba(255, 255, 255, 0.14);
}

body {
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: radial-gradient(900px 600px at 50% 0%, #23232e, var(--bg-top)) ,
              linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
  color: var(--text);
  padding: 2rem 1.5rem;
}

.app {
  width: 100%;
  max-width: 760px;
  text-align: center;
}

.header h1 {
  font-size: clamp(2rem, 7vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.header p {
  color: var(--muted);
  margin-top: 0.5rem;
  font-size: 0.95rem;
}

.pads {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 2.5rem;
}

.pad {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 1.6rem 0.5rem;
  background: var(--pad);
  border: 1px solid var(--pad-border);
  border-radius: 1rem;
  cursor: pointer;
  user-select: none;
  transition: transform 0.08s, box-shadow 0.2s, border-color 0.2s, background 0.2s;
}

.pad kbd {
  font-family: inherit;
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--accent-2);
}

.pad .sound {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.pad:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(245, 158, 11, 0.5);
}

.pad:focus-visible {
  outline: none;
  border-color: var(--accent-2);
  box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.25);
}

.pad.playing {
  transform: scale(0.95);
  background: var(--accent);
  border-color: var(--accent-2);
  box-shadow: 0 0 24px rgba(245, 158, 11, 0.65);
  transition: transform 0.06s;
}

.pad.playing kbd,
.pad.playing .sound {
  color: #0a0a0f;
}

.footer-note {
  margin-top: 2rem;
  color: var(--muted);
  font-size: 0.82rem;
}

@media (max-width: 520px) {
  .pads {
    grid-template-columns: repeat(3, 1fr);
    gap: 0.6rem;
  }
  .pad {
    padding: 1.1rem 0.3rem;
  }
  .pad kbd {
    font-size: 1.2rem;
  }
}