:root {
  --bg-0: #070b14;
  --bg-1: #0f1a30;
  --ink: #e9f2ff;
  --hot: #ff6a3d;
  --cool: #2ed6ff;
  --ok: #59ffa8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Oxanium", sans-serif;
  color: var(--ink);
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at 20% 20%, #1c2b4d 0, transparent 40%),
    radial-gradient(circle at 80% 10%, #2a1138 0, transparent 35%),
    linear-gradient(135deg, var(--bg-0), var(--bg-1));
}

.bg-glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(circle at center, rgb(46 214 255 / 0.12), transparent 60%);
  animation: pulse 2.5s ease-in-out infinite;
}

.arena {
  width: min(880px, 92vw);
  border: 1px solid rgb(255 255 255 / 0.14);
  background: rgb(7 10 20 / 0.74);
  backdrop-filter: blur(8px);
  border-radius: 18px;
  padding: 1.2rem;
  box-shadow: 0 28px 80px rgb(0 0 0 / 0.45);
}

.subtitle {
  margin: 0.35rem 0 0;
  color: #b9d4ff;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

h1 {
  margin: 0;
  letter-spacing: 0.05em;
}

.meta {
  display: flex;
  gap: 1rem;
  font-size: 0.95rem;
}

.meta strong {
  color: var(--ok);
}

.prompt {
  margin: 1.2rem 0;
  min-height: 120px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  text-align: center;
  font-size: clamp(1.2rem, 3.6vw, 2.4rem);
  letter-spacing: 0.05em;
  border: 1px dashed rgb(255 255 255 / 0.26);
  background: linear-gradient(130deg, rgb(255 106 61 / 0.14), rgb(46 214 255 / 0.14));
}

.controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.9rem;
}

.mobile-panel {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: 16px;
  border: 1px solid rgb(255 255 255 / 0.14);
  background: linear-gradient(180deg, rgb(255 255 255 / 0.04), rgb(255 255 255 / 0.02));
}

.mobile-copy h2 {
  margin: 0;
  font-size: 1rem;
}

.mobile-copy p {
  margin: 0.35rem 0 0.9rem;
  color: #b9d4ff;
}

.pad-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.pad {
  min-height: 92px;
  font-size: clamp(1.5rem, 5vw, 2.4rem);
  border-radius: 16px;
  background: linear-gradient(135deg, rgb(46 214 255 / 0.18), rgb(255 106 61 / 0.18));
  color: var(--ink);
  border: 1px solid rgb(255 255 255 / 0.18);
}

.pad.target {
  box-shadow: 0 0 0 2px rgb(89 255 168 / 0.4), 0 0 28px rgb(89 255 168 / 0.25);
  background: linear-gradient(135deg, rgb(89 255 168 / 0.3), rgb(46 214 255 / 0.22));
}

.pad:active {
  transform: scale(0.98);
}

button {
  border: 0;
  background: linear-gradient(95deg, var(--hot), #ff8f3d);
  color: #191003;
  font: inherit;
  font-weight: 700;
  padding: 0.8rem 1.2rem;
  border-radius: 10px;
  cursor: pointer;
  transition: transform 140ms ease;
}

button:hover {
  transform: translateY(-1px) scale(1.02);
}

.keys {
  display: flex;
  gap: 0.4rem;
}

kbd {
  border: 1px solid rgb(255 255 255 / 0.34);
  border-bottom-width: 3px;
  border-radius: 8px;
  min-width: 34px;
  text-align: center;
  padding: 0.45rem 0.4rem;
}

.ideas {
  margin-top: 1rem;
  border-top: 1px solid rgb(255 255 255 / 0.18);
  padding-top: 0.8rem;
}

.ideas h2 {
  margin: 0 0 0.45rem;
  font-size: 1.05rem;
}

.ideas ul {
  margin: 0;
  padding-left: 1rem;
  color: #b9d4ff;
}

.hit {
  transform: scale(1.02);
  box-shadow: 0 0 22px rgb(89 255 168 / 0.33) inset;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 0.2;
  }
  50% {
    opacity: 0.65;
  }
}

@media (max-width: 640px) {
  body {
    place-items: stretch;
  }

  .arena {
    width: 100%;
    min-height: 100vh;
    border-radius: 0;
    padding: 1rem;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.8rem;
  }

  .prompt {
    min-height: 100px;
  }

  .controls {
    align-items: stretch;
  }

  .controls button,
  .keys {
    width: 100%;
  }

  .keys {
    justify-content: space-between;
  }
}

@media (orientation: landscape) and (max-width: 932px) {
  .arena {
    width: min(960px, 96vw);
  }

  .pad {
    min-height: 76px;
  }
}