@font-face {
  font-display: swap;
}

:root {
  --neon-orange: #ff9500;
  --neon-orange-bright: #ffb347;
  --neon-cyan: #23e6ff;
  --bg-dark: #05060a;
  --panel-bg: rgba(10, 12, 20, 0.88);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-dark);
  overflow: hidden;
  font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  color: #eaf6ff;
  user-select: none;
}

canvas#game {
  position: fixed;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
}

.hidden { display: none !important; }

/* ---------- Boot screen ---------- */
#boot {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: radial-gradient(ellipse at center, #101425 0%, #05060a 75%);
}

#boot-logo {
  font-size: 3.2rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  color: var(--neon-orange);
  text-shadow: 0 0 12px var(--neon-orange), 0 0 40px rgba(255,149,0,0.6);
}
#boot-logo span { color: #fff; text-shadow: 0 0 12px #fff, 0 0 30px var(--neon-orange); }
#boot-sub {
  letter-spacing: 0.6em;
  color: var(--neon-cyan);
  margin-top: 4px;
  font-size: 0.9rem;
  text-shadow: 0 0 10px var(--neon-cyan);
}
#boot-bar {
  width: 280px;
  height: 6px;
  margin-top: 34px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,149,0,0.4);
  border-radius: 3px;
  overflow: hidden;
}
#boot-bar-fill {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--neon-orange), var(--neon-orange-bright));
  box-shadow: 0 0 10px var(--neon-orange);
  transition: width 0.2s ease-out;
}
#boot-tip {
  margin-top: 14px;
  font-size: 0.8rem;
  color: #8aa;
}

/* ---------- Menu / Finish overlays ---------- */
#menu, #finish {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(2,3,6,0.55);
  backdrop-filter: blur(2px);
}

.panel {
  background: var(--panel-bg);
  border: 1px solid rgba(255,149,0,0.35);
  box-shadow: 0 0 40px rgba(255,149,0,0.15), inset 0 0 60px rgba(35,230,255,0.03);
  border-radius: 10px;
  padding: 32px 40px;
  min-width: 340px;
  max-width: 92vw;
  text-align: center;
}

.panel h1 {
  margin: 0 0 4px;
  font-size: 2rem;
  letter-spacing: 0.05em;
  color: #fff;
  text-shadow: 0 0 10px var(--neon-orange);
}
.panel h1 span { color: var(--neon-orange); }
.tagline { margin: 0 0 22px; color: var(--neon-cyan); font-size: 0.85rem; letter-spacing: 0.15em; }

button {
  font-family: inherit;
  font-weight: 700;
  letter-spacing: 0.08em;
  font-size: 1rem;
  padding: 12px 30px;
  margin: 6px 6px;
  border-radius: 6px;
  border: 1px solid var(--neon-orange);
  background: linear-gradient(180deg, rgba(255,149,0,0.25), rgba(255,149,0,0.08));
  color: #fff;
  cursor: pointer;
  box-shadow: 0 0 14px rgba(255,149,0,0.35);
  transition: transform 0.1s ease, box-shadow 0.15s ease;
}
button:hover { box-shadow: 0 0 24px rgba(255,149,0,0.7); transform: translateY(-1px); }
button:active { transform: translateY(0); }

.controls-help {
  margin: 18px 0 20px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 18px;
  font-size: 0.8rem;
  color: #bcd;
  text-align: left;
}
.controls-help b { color: var(--neon-cyan); }

.board { margin-top: 18px; border-top: 1px solid rgba(255,255,255,0.1); padding-top: 14px; }
.board h2 { margin: 0 0 8px; font-size: 0.85rem; letter-spacing: 0.1em; color: var(--neon-cyan); }
#highscore-list { list-style: none; margin: 0; padding: 0; font-size: 0.85rem; }
#highscore-list li {
  display: flex;
  justify-content: space-between;
  padding: 3px 4px;
  border-bottom: 1px dashed rgba(255,255,255,0.08);
}
#highscore-list li.empty { justify-content: center; color: #667; }
#highscore-list li span.name { color: #fff; }
#highscore-list li span.time { color: var(--neon-orange-bright); font-variant-numeric: tabular-nums; }

#finish-name {
  display: block;
  margin: 14px auto;
  width: 80%;
  padding: 10px 12px;
  font-size: 1rem;
  border-radius: 6px;
  border: 1px solid var(--neon-cyan);
  background: rgba(0,0,0,0.4);
  color: #fff;
  text-align: center;
}
#finish-time { font-size: 1.3rem; color: var(--neon-orange-bright); margin: 4px 0 8px; }

/* ---------- HUD ---------- */
#hud {
  position: fixed;
  inset: 0;
  z-index: 20;
  pointer-events: none;
  font-variant-numeric: tabular-nums;
}

#hud-top {
  position: absolute;
  top: 16px;
  left: 16px;
  right: 16px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}
#hud-lap {
  background: rgba(5,6,10,0.6);
  border: 1px solid rgba(255,149,0,0.4);
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  text-shadow: 0 0 8px var(--neon-orange);
}
#hud-time {
  background: rgba(5,6,10,0.6);
  border: 1px solid rgba(35,230,255,0.35);
  padding: 8px 16px;
  border-radius: 6px;
  text-align: right;
  font-size: 1rem;
  color: var(--neon-cyan);
}
#hud-time .best { font-size: 0.8rem; color: #7cc; margin-top: 2px; }

#hud-speed {
  position: absolute;
  bottom: 22px;
  right: 26px;
  font-size: 3rem;
  font-weight: 900;
  color: var(--neon-orange-bright);
  text-shadow: 0 0 16px var(--neon-orange);
}
#hud-speed .unit { font-size: 1rem; margin-left: 6px; color: #ffd9a8; }

#hud-msg {
  position: absolute;
  top: 46%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 2.4rem;
  font-weight: 900;
  color: #fff;
  text-shadow: 0 0 20px var(--neon-orange), 0 0 50px var(--neon-orange);
  letter-spacing: 0.1em;
  opacity: 0;
  transition: opacity 0.3s ease;
}
#hud-msg.show { opacity: 1; }