:root {
  --bg-color: #121212;
  --text-color: #ffffff;
  --accent-color: #00ffcc; /* Neon Cyan */
  --accent-glow: 0 0 20px #00ffcc, 0 0 50px #00ffcc;
  --glass-bg: rgba(255, 255, 255, 0.05);
  --border: 1px solid rgba(255, 255, 255, 0.1);
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--bg-color);
  background-image: radial-gradient(circle at center, #1a1a2e 0%, #000000 100%);
  font-family: "Outfit", sans-serif;
  color: var(--text-color);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.title {
  font-size: 4rem;
  letter-spacing: 5px;
  text-transform: uppercase;
  margin-bottom: 2rem;
  text-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

.title span {
  color: var(--accent-color);
  text-shadow: var(--accent-glow);
}

.keys {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
  max-width: 1000px;
}

.key {
  background: var(--glass-bg);
  border: var(--border);
  border-radius: 1rem;
  width: 100px;
  height: 100px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: all 0.07s ease;
  cursor: pointer;
  user-select: none;
  backdrop-filter: blur(10px);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

/* Typography inside the keys */
kbd {
  font-size: 2.5rem;
  font-weight: 700;
}

.sound {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #888;
}

/* The Playing State - "Extraordinary" Glow */
.playing {
  transform: scale(1.1);
  border-color: var(--accent-color);
  box-shadow: var(--accent-glow);
}

.playing kbd {
  color: var(--accent-color);
}

.playing .sound {
  color: #fff;
}

footer {
  margin-top: 3rem;
  opacity: 0.5;
  font-size: 0.8rem;
}