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

:root {
  --bg-dark: #0a0a0f;
  --bg-card: #12121a;
  /* 21 unique neon colors */
  --neon-1: #00d4ff;   /* cyan-blue */
  --neon-2: #ff2d95;   /* hot pink */
  --neon-3: #b24dff;   /* purple */
  --neon-4: #39ff14;   /* green */
  --neon-5: #ff6b35;   /* orange */
  --neon-6: #fff01f;   /* yellow */
  --neon-7: #00fff7;   /* cyan */
  --neon-8: #ff3131;   /* red */
  --neon-9: #b8ff00;   /* lime */
  --neon-10: #ff77ff;  /* magenta */
  --neon-11: #00ff88;  /* mint */
  --neon-12: #ffaa00;  /* gold */
  --neon-13: #7b68ee;  /* slate blue */
  --neon-14: #ff6699;  /* coral pink */
  --neon-15: #00ffcc;  /* turquoise */
  --neon-16: #ff4500;  /* red-orange */
  --neon-17: #adff2f;  /* yellow-green */
  --neon-18: #da70d6;  /* orchid */
  --neon-19: #40e0d0;  /* teal */
  --neon-20: #ffd700;  /* bright gold */
  --neon-21: #87ceeb;  /* sky blue */
  --neon-22: #ff1493;  /* deep pink */
  --neon-23: #7fff00;  /* chartreuse */
  --neon-pink: #ff2d95;
  --text-light: #ffffff;
  --text-muted: #666680;
}

body {
  font-family: 'Comic Neue', cursive, sans-serif;
  background: var(--bg-dark);
  min-height: 100vh;
  color: var(--text-light);
}

.container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 2rem;
}

/* Header */
header {
  text-align: center;
  padding-top: 1rem;
}

h1 {
  font-family: 'Bangers', cursive;
  font-size: 4rem;
  letter-spacing: 6px;
  text-transform: uppercase;
  color: #fff;
  text-shadow: 0 0 10px var(--neon-pink);
}

/* Speed Buttons */
.speed-buttons {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-top: 1.5rem;
}

.speed-btn {
  padding: 0.6rem 1.5rem;
  background: transparent;
  border: 2px solid var(--text-muted);
  border-radius: 25px;
  color: var(--text-muted);
  font-family: 'Comic Neue', cursive;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s ease;
}

.speed-btn:hover {
  border-color: var(--neon-pink);
  color: var(--neon-pink);
}

.speed-btn.active {
  background: var(--neon-pink);
  border-color: var(--neon-pink);
  color: #000;
  box-shadow: 0 0 15px rgba(255, 45, 149, 0.5);
}

/* Soundboard - centered in remaining space */
.soundboard {
  flex: 1;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-content: center;
  gap: 1rem;
  padding: 2rem 0;
  max-width: 600px;
  margin: 0 auto;
}

/* Sound Buttons */
.sound-btn {
  width: 160px;
  height: 60px;
  background: var(--bg-card);
  border: 2px solid;
  border-radius: 10px;
  font-family: 'Comic Neue', cursive;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s ease;
}

.sound-btn:hover {
  transform: scale(1.05);
}

.sound-btn:active {
  transform: scale(0.97);
}

/* Button colors - 21 unique colors */
.sound-btn:nth-child(1) { border-color: var(--neon-1); color: var(--neon-1); box-shadow: 0 0 10px rgba(0, 212, 255, 0.3); }
.sound-btn:nth-child(2) { border-color: var(--neon-2); color: var(--neon-2); box-shadow: 0 0 10px rgba(255, 45, 149, 0.3); }
.sound-btn:nth-child(3) { border-color: var(--neon-3); color: var(--neon-3); box-shadow: 0 0 10px rgba(178, 77, 255, 0.3); }
.sound-btn:nth-child(4) { border-color: var(--neon-4); color: var(--neon-4); box-shadow: 0 0 10px rgba(57, 255, 20, 0.3); }
.sound-btn:nth-child(5) { border-color: var(--neon-5); color: var(--neon-5); box-shadow: 0 0 10px rgba(255, 107, 53, 0.3); }
.sound-btn:nth-child(6) { border-color: var(--neon-6); color: var(--neon-6); box-shadow: 0 0 10px rgba(255, 240, 31, 0.3); }
.sound-btn:nth-child(7) { border-color: var(--neon-7); color: var(--neon-7); box-shadow: 0 0 10px rgba(0, 255, 247, 0.3); }
.sound-btn:nth-child(8) { border-color: var(--neon-8); color: var(--neon-8); box-shadow: 0 0 10px rgba(255, 49, 49, 0.3); }
.sound-btn:nth-child(9) { border-color: var(--neon-9); color: var(--neon-9); box-shadow: 0 0 10px rgba(184, 255, 0, 0.3); }
.sound-btn:nth-child(10) { border-color: var(--neon-10); color: var(--neon-10); box-shadow: 0 0 10px rgba(255, 119, 255, 0.3); }
.sound-btn:nth-child(11) { border-color: var(--neon-11); color: var(--neon-11); box-shadow: 0 0 10px rgba(0, 255, 136, 0.3); }
.sound-btn:nth-child(12) { border-color: var(--neon-12); color: var(--neon-12); box-shadow: 0 0 10px rgba(255, 170, 0, 0.3); }
.sound-btn:nth-child(13) { border-color: var(--neon-13); color: var(--neon-13); box-shadow: 0 0 10px rgba(123, 104, 238, 0.3); }
.sound-btn:nth-child(14) { border-color: var(--neon-14); color: var(--neon-14); box-shadow: 0 0 10px rgba(255, 102, 153, 0.3); }
.sound-btn:nth-child(15) { border-color: var(--neon-15); color: var(--neon-15); box-shadow: 0 0 10px rgba(0, 255, 204, 0.3); }
.sound-btn:nth-child(16) { border-color: var(--neon-16); color: var(--neon-16); box-shadow: 0 0 10px rgba(255, 69, 0, 0.3); }
.sound-btn:nth-child(17) { border-color: var(--neon-17); color: var(--neon-17); box-shadow: 0 0 10px rgba(173, 255, 47, 0.3); }
.sound-btn:nth-child(18) { border-color: var(--neon-18); color: var(--neon-18); box-shadow: 0 0 10px rgba(218, 112, 214, 0.3); }
.sound-btn:nth-child(19) { border-color: var(--neon-19); color: var(--neon-19); box-shadow: 0 0 10px rgba(64, 224, 208, 0.3); }
.sound-btn:nth-child(20) { border-color: var(--neon-20); color: var(--neon-20); box-shadow: 0 0 10px rgba(255, 215, 0, 0.3); }
.sound-btn:nth-child(21) { border-color: var(--neon-21); color: var(--neon-21); box-shadow: 0 0 10px rgba(135, 206, 235, 0.3); }
.sound-btn:nth-child(22) { border-color: var(--neon-22); color: var(--neon-22); box-shadow: 0 0 10px rgba(255, 20, 147, 0.3); }
.sound-btn:nth-child(23) { border-color: var(--neon-23); color: var(--neon-23); box-shadow: 0 0 10px rgba(127, 255, 0, 0.3); }

.sound-btn:nth-child(1):hover { box-shadow: 0 0 25px rgba(0, 212, 255, 0.6); }
.sound-btn:nth-child(2):hover { box-shadow: 0 0 25px rgba(255, 45, 149, 0.6); }
.sound-btn:nth-child(3):hover { box-shadow: 0 0 25px rgba(178, 77, 255, 0.6); }
.sound-btn:nth-child(4):hover { box-shadow: 0 0 25px rgba(57, 255, 20, 0.6); }
.sound-btn:nth-child(5):hover { box-shadow: 0 0 25px rgba(255, 107, 53, 0.6); }
.sound-btn:nth-child(6):hover { box-shadow: 0 0 25px rgba(255, 240, 31, 0.6); }
.sound-btn:nth-child(7):hover { box-shadow: 0 0 25px rgba(0, 255, 247, 0.6); }
.sound-btn:nth-child(8):hover { box-shadow: 0 0 25px rgba(255, 49, 49, 0.6); }
.sound-btn:nth-child(9):hover { box-shadow: 0 0 25px rgba(184, 255, 0, 0.6); }
.sound-btn:nth-child(10):hover { box-shadow: 0 0 25px rgba(255, 119, 255, 0.6); }
.sound-btn:nth-child(11):hover { box-shadow: 0 0 25px rgba(0, 255, 136, 0.6); }
.sound-btn:nth-child(12):hover { box-shadow: 0 0 25px rgba(255, 170, 0, 0.6); }
.sound-btn:nth-child(13):hover { box-shadow: 0 0 25px rgba(123, 104, 238, 0.6); }
.sound-btn:nth-child(14):hover { box-shadow: 0 0 25px rgba(255, 102, 153, 0.6); }
.sound-btn:nth-child(15):hover { box-shadow: 0 0 25px rgba(0, 255, 204, 0.6); }
.sound-btn:nth-child(16):hover { box-shadow: 0 0 25px rgba(255, 69, 0, 0.6); }
.sound-btn:nth-child(17):hover { box-shadow: 0 0 25px rgba(173, 255, 47, 0.6); }
.sound-btn:nth-child(18):hover { box-shadow: 0 0 25px rgba(218, 112, 214, 0.6); }
.sound-btn:nth-child(19):hover { box-shadow: 0 0 25px rgba(64, 224, 208, 0.6); }
.sound-btn:nth-child(20):hover { box-shadow: 0 0 25px rgba(255, 215, 0, 0.6); }
.sound-btn:nth-child(21):hover { box-shadow: 0 0 25px rgba(135, 206, 235, 0.6); }
.sound-btn:nth-child(22):hover { box-shadow: 0 0 25px rgba(255, 20, 147, 0.6); }
.sound-btn:nth-child(23):hover { box-shadow: 0 0 25px rgba(127, 255, 0, 0.6); }

/* Empty state */
.empty-state {
  text-align: center;
  padding: 3rem 2rem;
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 600px) {
  .container {
    padding: 1.5rem;
  }

  h1 {
    font-size: 2.5rem;
    letter-spacing: 4px;
  }

  .controls-panel {
    max-width: 100%;
  }

  .speed-control {
    padding: 1rem 1.5rem;
    gap: 1rem;
  }

  .speed-control label {
    font-size: 0.85rem;
  }

  .speed-control span {
    font-size: 1.2rem;
    min-width: 45px;
  }

  .soundboard {
    gap: 0.75rem;
  }

  .sound-btn {
    width: calc(50% - 0.5rem);
    height: 55px;
    font-size: 0.75rem;
  }
}

@media (max-width: 360px) {
  h1 {
    font-size: 2rem;
  }

  .sound-btn {
    font-size: 0.7rem;
    height: 50px;
  }
}