:root {
  --bg-app: #0f172a;
  --bg-panel: #020617;
  --bg-pad: #1e293b;
  --bg-pad-active: #0ea5e9;

  --text-main: #e5e7eb;
  --text-accent: #38bdf8;

  --border-soft: #020617;
  --glow: rgba(56, 189, 248, 0.6);

  --radius-lg: 16px;
  --radius-md: 10px;

  --pad-size: 80px;
  --font-main: system-ui, sans-serif;
}

* {
  box-sizing: border-box;
  font-family: var(--font-main);
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at top, #1e293b, var(--bg-app));
  color: var(--text-main);
}

/* App Card */
#drum-machine {
  background: var(--bg-panel);
  border-radius: var(--radius-lg);
  padding: 20px;
  width: 340px;
  box-shadow: 0 25px 60px rgba(0,0,0,0.7);
  text-align: center;
}

/* Grid */
#pad-bank {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-bottom: 15px;
}

/* Pads */
.drum-pad {
  height: var(--pad-size);
  background: linear-gradient(145deg, var(--bg-pad), var(--bg-panel));
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-accent);
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow:
    0 6px 0 var(--border-soft),
    0 12px 25px rgba(0,0,0,0.6);
  transition: transform 0.08s ease, box-shadow 0.08s ease, background 0.08s ease;
}

.drum-pad:active,
.drum-pad.active {
  transform: translateY(4px) scale(0.97);
  background: linear-gradient(145deg, var(--bg-pad-active), #0284c7);
  color: #fff;
  box-shadow:
    0 2px 0 var(--border-soft),
    0 4px 10px rgba(0,0,0,0.5),
    0 0 12px var(--glow);
}


/* Display */
#display {
  margin-top: 12px;
  padding: 10px;
  background: var(--bg-panel);
  border-radius: var(--radius-md);
  min-height: 28px;
  color: var(--text-accent);
  font-weight: 600;
  letter-spacing: 1px;
  box-shadow: inset 0 0 12px rgba(0,0,0,0.7);
}

/* ---------------- MOBILE ---------------- */
@media (max-width: 480px) {


  #drum-machine {
    width: 95%;
    padding: 16px;
  }

  .drum-pad {
    font-size: 1.25rem;
  }
}

/* ---------------- TABLET+ ---------------- */
@media (min-width: 768px) {
  #drum-machine {
    width: 400px;
  }
}