:root {
  --bg-dark: #0a0e17;
  --bg-grid: #0d1220;
  --cyan: #00f0ff;
  --cyan-glow: rgba(0, 240, 255, 0.8);
  --orange: #ff6600;
  --orange-glow: rgba(255, 102, 0, 0.8);
  --grid-line: rgba(0, 240, 255, 0.08);
  --text-dim: rgba(255, 255, 255, 0.5);
  --border-neon: rgba(0, 240, 255, 0.3);
}

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

body {
  min-height: 100vh;
  background: var(--bg-dark);
  color: #fff;
  font-family: 'Orbitron', sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow-x: hidden;
  position: relative;
}

.scanlines {
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.15) 2px,
    rgba(0, 0, 0, 0.15) 4px
  );
  pointer-events: none;
  z-index: 100;
}

.grid-bg {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

.header {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 1.5rem 0;
}

.logo {
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 900;
  letter-spacing: 0.4em;
  text-shadow:
    0 0 10px var(--cyan-glow),
    0 0 30px var(--cyan-glow);
}

.logo-t { color: var(--cyan); }
.logo-r { color: #00c8ff; }
.logo-o { color: #00a0e0; }
.logo-n { color: var(--cyan); }

.subtitle {
  font-size: 0.7rem;
  letter-spacing: 0.5em;
  color: var(--text-dim);
  margin-top: 0.25rem;
}

.game-container {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding: 0 1rem 2rem;
}

.hud {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.score-box {
  min-width: 100px;
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-neon);
  border-radius: 4px;
  text-align: center;
  background: rgba(0, 0, 0, 0.4);
}

.score-box.p1 {
  border-color: var(--cyan);
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.2);
}

.score-box.p2 {
  border-color: var(--orange);
  box-shadow: 0 0 15px rgba(255, 102, 0, 0.2);
}

.score-box .label {
  display: block;
  font-size: 0.6rem;
  color: var(--text-dim);
  letter-spacing: 0.2em;
}

.score-box.p1 .score { color: var(--cyan); }
.score-box.p2 .score { color: var(--orange); }

.score-box .score {
  font-size: 1.5rem;
  font-weight: 700;
}

.vs {
  font-size: 0.9rem;
  color: var(--text-dim);
  letter-spacing: 0.3em;
}

.canvas-wrap {
  position: relative;
  border: 2px solid var(--border-neon);
  border-radius: 8px;
  box-shadow:
    0 0 20px rgba(0, 240, 255, 0.15),
    inset 0 0 60px rgba(0, 0, 0, 0.5);
  background: var(--bg-grid);
}

#gameCanvas {
  display: block;
  border-radius: 6px;
  background: #050810;
}

.overlay {
  position: absolute;
  inset: 0;
  background: rgba(5, 8, 16, 0.92);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.3s;
}

.overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.overlay-content {
  text-align: center;
  padding: 2rem;
}

.overlay-content h2 {
  font-size: 1.5rem;
  color: var(--cyan);
  text-shadow: 0 0 20px var(--cyan-glow);
  margin-bottom: 0.5rem;
}

.overlay-content p {
  color: var(--text-dim);
  font-size: 0.85rem;
}

.overlay-content .winner {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.overlay-content .winner.p1 { color: var(--cyan); }
.overlay-content .winner.p2 { color: var(--orange); }

kbd {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  margin: 0 2px;
  font-family: inherit;
  font-size: 0.75rem;
  background: rgba(0, 240, 255, 0.1);
  border: 1px solid var(--border-neon);
  border-radius: 4px;
  color: var(--cyan);
}

.controls {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.mode-select {
  display: flex;
  gap: 0.5rem;
}

.mode-btn {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.75rem;
  padding: 0.5rem 1rem;
  background: transparent;
  border: 1px solid var(--border-neon);
  color: var(--text-dim);
  cursor: pointer;
  border-radius: 4px;
  letter-spacing: 0.1em;
  transition: all 0.2s;
}

.mode-btn:hover {
  color: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.2);
}

.mode-btn.active {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(0, 240, 255, 0.1);
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.25);
}

.hidden {
  display: none !important;
}

.bot-number-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  justify-content: center;
}

.bot-number-label {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}

.bot-number-input {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.8rem;
  width: 3rem;
  padding: 0.35rem 0.5rem;
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid var(--border-neon);
  border-radius: 4px;
  color: var(--cyan);
  text-align: center;
}

.bot-number-input:focus {
  outline: none;
  box-shadow: 0 0 12px rgba(0, 240, 255, 0.25);
}

.score-box.bot-count .score {
  color: var(--cyan);
}

.grid-size-select {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.grid-size-label {
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: var(--text-dim);
}

.grid-size-btn {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.75rem;
  padding: 0.4rem 0.75rem;
  background: transparent;
  border: 1px solid var(--border-neon);
  color: var(--text-dim);
  cursor: pointer;
  border-radius: 4px;
  letter-spacing: 0.05em;
  transition: all 0.2s;
}

.grid-size-btn:hover {
  color: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 12px rgba(0, 240, 255, 0.2);
}

.grid-size-btn.active {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(0, 240, 255, 0.1);
  box-shadow: 0 0 12px rgba(0, 240, 255, 0.25);
}

.keys {
  display: flex;
  gap: 2rem;
  font-size: 0.7rem;
  color: var(--text-dim);
}

.key-group {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.key-label {
  margin-right: 0.5rem;
}

.btn-primary {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.9rem;
  padding: 0.6rem 2rem;
  background: transparent;
  border: 2px solid var(--cyan);
  color: var(--cyan);
  cursor: pointer;
  border-radius: 4px;
  letter-spacing: 0.2em;
  transition: all 0.2s;
  text-transform: uppercase;
}

.btn-primary:hover {
  background: rgba(0, 240, 255, 0.15);
  box-shadow: 0 0 25px var(--cyan-glow);
}

.footer {
  position: relative;
  z-index: 1;
  font-size: 0.65rem;
  letter-spacing: 0.3em;
  color: var(--text-dim);
  padding-bottom: 1rem;
}

@media (max-width: 640px) {
  #gameCanvas {
    width: 100%;
    max-width: 100vw;
    height: auto;
  }
  .canvas-wrap {
    width: 100%;
    max-width: min(100vw - 2rem, 600px);
  }
  .logo { letter-spacing: 0.2em; }
  .keys { flex-direction: column; gap: 0.5rem; }
}