:root {
  --bg: #020308;
  --cyan: #3df2ff;
  --magenta: #ff2d95;
  --violet: #9b5cff;
  --amber: #ffb020;
  --text: #d7deea;
  --muted: #7c8799;
  --font-display: "Orbitron", sans-serif;
  --font-mono: "Share Tech Mono", monospace;
  --font-body: "Rajdhani", sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: #020308;
  color: var(--text);
  font-family: var(--font-body);
  overflow: hidden;
}

a { color: var(--cyan); text-decoration: none; }
a:hover { color: #fff; text-shadow: 0 0 10px var(--cyan); }

.fx-scanlines, .fx-vignette {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 40;
}
.fx-scanlines {
  background: repeating-linear-gradient(to bottom, transparent 0, transparent 2px, rgba(0,0,0,0.14) 3px);
  opacity: 0.4;
  mix-blend-mode: multiply;
}
.fx-vignette {
  background: radial-gradient(ellipse at center, transparent 40%, rgba(0,0,0,0.65) 100%);
}

/* ---------- title (tron.html) ---------- */
.title-page {
  min-height: 100%;
  display: grid;
  place-items: center;
  position: relative;
  isolation: isolate;
}
.title-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(to top, rgba(2,3,8,0.92), rgba(2,3,8,0.35) 50%, rgba(2,3,8,0.55)),
    url("../images/ui/arena.jpg") center / cover no-repeat;
}
.title-card {
  text-align: center;
  padding: 28px 24px 36px;
  max-width: 760px;
}
.title-card img.cycle {
  width: min(520px, 86vw);
  margin: 0 auto 8px;
  mix-blend-mode: screen;
  -webkit-mask-image: radial-gradient(ellipse 72% 68% at 50% 50%, #000 42%, transparent 74%);
  mask-image: radial-gradient(ellipse 72% 68% at 50% 50%, #000 42%, transparent 74%);
  filter: drop-shadow(0 0 24px rgba(61,242,255,0.45));
}
.title-card .eyebrow {
  font-family: var(--font-mono);
  letter-spacing: 0.4em;
  color: var(--magenta);
  font-size: 12px;
}
.title-card h1 {
  font-family: var(--font-display);
  font-size: clamp(36px, 8vw, 72px);
  letter-spacing: 0.16em;
  margin: 8px 0 6px;
  color: #fff;
  text-shadow: 0 0 22px rgba(61,242,255,0.6), 0 0 48px rgba(255,45,149,0.25);
}
.title-card p {
  font-family: var(--font-mono);
  color: var(--muted);
  letter-spacing: 0.08em;
  font-size: 13px;
  max-width: 38em;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.55;
}
.title-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  padding: 12px 22px;
  border: 1px solid var(--cyan);
  color: var(--cyan);
  background: rgba(61,242,255,0.06);
  cursor: pointer;
}
.btn:hover {
  background: rgba(61,242,255,0.16);
  box-shadow: 0 0 22px rgba(61,242,255,0.3);
  color: #fff;
}
.btn-mag {
  border-color: var(--magenta);
  color: var(--magenta);
  background: rgba(255,45,149,0.06);
}
.btn-mag:hover {
  background: rgba(255,45,149,0.16);
  box-shadow: 0 0 22px rgba(255,45,149,0.3);
  color: #fff;
}

/* ---------- arena (lightcycles.html) ---------- */
.arena-page { height: 100%; position: relative; }
#grid {
  display: block;
  width: 100%;
  height: 100%;
  background: #020308;
}

.hud {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 14px 18px;
  pointer-events: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
}
.hud a, .hud button { pointer-events: auto; }
.hud .left, .hud .right { display: grid; gap: 6px; }
.hud .stat { color: var(--muted); }
.hud .stat b { color: var(--cyan); font-weight: 400; }
.boost-wrap { width: 140px; height: 6px; border: 1px solid rgba(61,242,255,0.4); }
.boost-wrap i {
  display: block;
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--magenta));
  transform-origin: left;
}

.menu, .result {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(2,3,8,0.72);
  text-align: center;
  padding: 20px;
}
.menu.hidden, .result.hidden { display: none; }
.menu-card, .result-card { max-width: 560px; }
.menu h1, .result h1 {
  font-family: var(--font-display);
  letter-spacing: 0.16em;
  font-size: clamp(28px, 6vw, 48px);
  margin: 0 0 8px;
  text-shadow: 0 0 18px var(--cyan);
}
.menu p, .result p {
  font-family: var(--font-mono);
  color: var(--muted);
  letter-spacing: 0.1em;
}
.diff {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin: 18px 0 22px;
  flex-wrap: wrap;
}
.diff button {
  font-family: var(--font-mono);
  background: transparent;
  border: 1px solid rgba(61,242,255,0.3);
  color: var(--muted);
  padding: 8px 14px;
  cursor: pointer;
  letter-spacing: 0.14em;
}
.diff button.on {
  color: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 16px rgba(61,242,255,0.25);
}
.help {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.08em;
  margin-top: 16px;
}

.touch {
  position: fixed;
  bottom: 18px;
  left: 0;
  right: 0;
  z-index: 25;
  display: none;
  justify-content: center;
  gap: 10px;
  pointer-events: none;
}
.touch button {
  pointer-events: auto;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  background: rgba(2,3,8,0.55);
  color: var(--cyan);
  font-family: var(--font-display);
  font-size: 18px;
}
@media (pointer: coarse) {
  .touch { display: flex; }
}