/* 霓虹飞车 · Neon Racer — 合成波霓虹视觉系统（设计文档第 4 章） */
:root {
  --bg: #0a0a1a;
  --bg2: #120a26;
  --panel: rgba(0, 0, 0, 0.7);
  --ink: #ffffff;
  --muted: #a0a0c0;
  --purple: #c400ff;
  --cyan: #00e5ff;
  --orange: #ff6b00;
  --green: #39ff14;
  --gold: #ffd400;
  --line: rgba(196, 0, 255, 0.55);
  --radius: 16px;
  --glow-purple: 0 0 18px rgba(196, 0, 255, 0.55), 0 0 40px rgba(196, 0, 255, 0.25);
  --glow-cyan: 0 0 18px rgba(0, 229, 255, 0.5);
  --font-title: "Orbitron", "Rajdhani", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font: "Rajdhani", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }
html, body {
  width: 100%; height: 100%; overflow: hidden;
  background: var(--bg); color: var(--ink);
  font-family: var(--font);
  user-select: none; touch-action: none;
}
body { letter-spacing: 0.02em; }

#app { position: relative; width: 100%; height: 100%; }
#game-canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }

/* 全屏 FX overlay */
.fx-overlay {
  position: absolute; inset: 0; pointer-events: none; z-index: 14;
  opacity: 0; transition: opacity 0.12s linear;
}
#speedlines {
  --intensity: 0;
  opacity: var(--intensity);
  background:
    repeating-conic-gradient(from 0deg at 50% 50%,
      rgba(255,255,255,0) 0deg, rgba(255,255,255,0) 1.6deg,
      rgba(255,255,255,0.55) 1.9deg, rgba(255,255,255,0) 2.3deg);
  -webkit-mask: radial-gradient(circle at 50% 50%, transparent 26%, #000 72%);
          mask: radial-gradient(circle at 50% 50%, transparent 26%, #000 72%);
  mix-blend-mode: screen;
}
#edgeflash {
  box-shadow: inset 0 0 120px 30px rgba(255, 107, 0, 0);
  transition: box-shadow 0.08s ease-out;
}
#edgeflash.flash {
  box-shadow: inset 0 0 140px 46px rgba(255, 107, 0, 0.7);
  transition: box-shadow 0.05s ease-out;
}
#transition {
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.9), transparent);
  width: 40%; left: -40%; filter: blur(6px);
  transform: skewX(-18deg);
}
#transition.run { animation: sweep 0.34s ease-in-out; }
@keyframes sweep {
  0% { left: -45%; opacity: 0; }
  35% { opacity: 1; }
  100% { left: 110%; opacity: 0; }
}

.overlay {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  z-index: 20;
}
.hidden { display: none !important; }

/* Loading */
#loading {
  background: radial-gradient(ellipse at 50% 28%, #2a0a4e 0%, var(--bg) 68%);
  flex-direction: column;
}
.load-box { text-align: center; width: min(86vw, 420px); }
.load-logo {
  font-family: var(--font-title); font-weight: 900;
  font-size: clamp(40px, 10vw, 66px); letter-spacing: 0.14em;
  background: linear-gradient(120deg, var(--cyan), var(--purple), var(--orange));
  -webkit-background-clip: text; background-clip: text; color: transparent;
  text-shadow: 0 0 40px rgba(196, 0, 255, 0.4);
}
.load-sub { color: var(--muted); letter-spacing: 0.3em; margin: 8px 0 28px; font-size: 13px; }
.load-bar { height: 4px; border-radius: 99px; background: rgba(255,255,255,0.08); overflow: hidden; }
.load-bar i {
  display: block; height: 100%; width: 8%;
  background: linear-gradient(90deg, var(--cyan), var(--purple));
  border-radius: 99px; transition: width 0.25s ease; box-shadow: 0 0 16px var(--purple);
}
.load-tip { margin-top: 16px; color: var(--muted); font-size: 13px; min-height: 1.4em; }

/* Buttons */
.btn {
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.05);
  color: var(--ink);
  font: 600 15px/1 var(--font);
  padding: 14px 22px; border-radius: 999px; cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease, border-color 0.15s;
  text-decoration: none; display: inline-flex; align-items: center; justify-content: center;
  letter-spacing: 0.05em;
}
.btn:hover { transform: translateY(-1px) scale(1.05); background: rgba(196,0,255,0.12); box-shadow: var(--glow-purple); border-color: var(--purple); }
.btn:active { transform: scale(0.95); }
.btn-primary {
  background: linear-gradient(120deg, var(--purple), #7a1bff);
  border-color: transparent; box-shadow: 0 8px 28px rgba(196, 0, 255, 0.4);
}
.btn-primary:hover { box-shadow: 0 10px 38px rgba(196, 0, 255, 0.6); }
.btn-ghost { background: rgba(255,255,255,0.04); }
.btn-sm { padding: 10px 16px; font-size: 13px; }
.btn-lg { padding: 18px 36px; font-size: 18px; width: 100%; margin-top: 18px; }

/* Menu */
#menu { background: transparent; }
.menu-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at 18% 82%, rgba(196,0,255,0.28), transparent 52%),
    radial-gradient(ellipse at 82% 18%, rgba(0,229,255,0.22), transparent 48%),
    linear-gradient(180deg, rgba(10,10,26,0.45), rgba(10,10,26,0.8));
}
.menu-scanline {
  position: absolute; inset: 0; opacity: 0.12; pointer-events: none;
  background: repeating-linear-gradient(0deg, rgba(255,255,255,0.06) 0, rgba(255,255,255,0.06) 1px, transparent 2px, transparent 4px);
}
.menu-panel { position: relative; z-index: 1; width: min(92vw, 560px); text-align: center; padding: 36px 28px; }
.menu-kicker { color: var(--cyan); letter-spacing: 0.32em; font-size: 12px; font-weight: 600; margin-bottom: 12px; font-family: var(--font-title); }
.menu-title {
  font-family: var(--font-title); font-weight: 900; font-size: clamp(48px, 12vw, 86px);
  letter-spacing: 0.08em; line-height: 1.02;
  background: linear-gradient(120deg, #fff 8%, var(--cyan) 42%, var(--purple) 82%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  text-shadow: 0 0 50px rgba(0, 229, 255, 0.25);
}
.menu-desc { color: var(--muted); margin: 14px 0 28px; font-size: 15px; letter-spacing: 0.08em; }
.menu-actions { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.menu-stats { display: flex; justify-content: center; gap: 28px; margin-top: 36px; }
.menu-stats div { text-align: center; }
.menu-stats b {
  display: block; font-family: var(--font-title); font-size: 28px; font-weight: 700;
  color: var(--gold); font-variant-numeric: tabular-nums; text-shadow: 0 0 16px rgba(255,212,0,0.4);
}
.menu-stats span { color: var(--muted); font-size: 12px; letter-spacing: 0.12em; }

/* Garage */
#garage {
  /* 中栏是 3D 展台，背景需压淡，否则车模被整层遮住 */
  background:
    radial-gradient(ellipse 46% 66% at 47% 56%, rgba(10,10,26,0.32) 0%, rgba(10,10,26,0.66) 55%, rgba(10,10,26,0.9) 100%),
    linear-gradient(180deg, rgba(10,10,26,0.55), rgba(10,10,26,0.78));
  flex-direction: column; align-items: stretch;
  padding: 18px clamp(12px, 3vw, 32px) 24px; gap: 14px;
}
.garage-head { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.garage-head h2 { font-family: var(--font-title); font-size: clamp(22px, 4vw, 32px); letter-spacing: 0.08em; font-weight: 700; }
.garage-hint { color: var(--muted); font-size: 13px; margin-left: auto; letter-spacing: 0.06em; }
.garage-body {
  flex: 1; min-height: 0;
  display: grid;
  /* 列表 | 3D 展台（空、透明） | 参数详情 */
  grid-template-columns: minmax(190px, 23%) minmax(0, 1fr) minmax(290px, 29%);
  gap: 16px;
}
.garage-stage {
  position: relative; min-width: 0;
  cursor: grab; touch-action: none; border-radius: var(--radius);
}
.garage-stage.dragging { cursor: grabbing; }
.garage-stage::after {
  content: ''; position: absolute; left: 50%; bottom: 6px; transform: translateX(-50%);
  width: 140px; height: 22px; border-radius: 50%;
  background: radial-gradient(ellipse at center, rgba(196,0,255,0.28), transparent 70%);
  pointer-events: none;
}
.car-list { overflow-y: auto; display: flex; flex-direction: column; gap: 10px; padding-right: 6px; }
.car-item {
  display: flex; align-items: center; gap: 12px; padding: 12px 14px;
  border-radius: 14px; border: 1px solid var(--line);
  background: rgba(255,255,255,0.03); cursor: pointer;
  transition: border-color 0.15s, background 0.15s, transform 0.15s, box-shadow 0.15s;
}
.car-item:hover { background: rgba(196,0,255,0.08); transform: translateX(3px); box-shadow: var(--glow-purple); }
.car-item.active {
  border-color: var(--purple); background: rgba(196, 0, 255, 0.14);
  box-shadow: 0 0 0 1px rgba(196,0,255,0.4), 0 8px 24px rgba(196,0,255,0.2);
}
.car-swatch { width: 12px; height: 36px; border-radius: 99px; flex-shrink: 0; box-shadow: 0 0 10px currentColor; }
.car-item .meta { min-width: 0; }
.car-item .name { font-family: var(--font-title); font-weight: 700; font-size: 14px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.car-item .brand { color: var(--muted); font-size: 12px; }

.car-detail {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: clamp(18px, 3vw, 32px); display: flex; flex-direction: column; justify-content: center;
  backdrop-filter: blur(12px); box-shadow: var(--glow-purple);
}
.car-name { font-family: var(--font-title); font-size: clamp(26px, 4vw, 40px); font-weight: 700; letter-spacing: 0.04em; }
.car-brand { color: var(--cyan); letter-spacing: 0.18em; font-size: 13px; margin: 6px 0 22px; }
.car-stats { display: flex; flex-direction: column; gap: 12px; }
.stat-row { display: grid; grid-template-columns: 72px 1fr 48px; gap: 10px; align-items: center; font-size: 13px; }
.stat-row .lbl { color: var(--muted); }
.stat-row .bar { height: 8px; border-radius: 99px; background: rgba(255,255,255,0.08); overflow: hidden; }
.stat-row .bar i { display: block; height: 100%; border-radius: 99px; background: linear-gradient(90deg, var(--cyan), var(--purple)); box-shadow: 0 0 10px var(--purple); }
.stat-row .val { text-align: right; font-weight: 700; font-variant-numeric: tabular-nums; font-family: var(--font-title); }

.paint-block { margin-top: 20px; }
.paint-label { color: var(--muted); font-size: 12px; letter-spacing: 0.18em; margin-bottom: 8px; }
.paint-swatches { display: flex; flex-wrap: wrap; gap: 8px; }
.swatch {
  width: 26px; height: 26px; border-radius: 8px; cursor: pointer; border: 2px solid rgba(255,255,255,0.18);
  transition: transform 0.12s, border-color 0.12s, box-shadow 0.12s;
}
.swatch:hover { transform: scale(1.15); }
.swatch.active { border-color: #fff; box-shadow: 0 0 12px currentColor; transform: scale(1.12); }

/* HUD */
#hud {
  position: absolute; inset: 0; pointer-events: none; z-index: 10;
  padding: max(12px, env(safe-area-inset-top)) max(12px, env(safe-area-inset-right))
           max(12px, env(safe-area-inset-bottom)) max(12px, env(safe-area-inset-left));
}
.hud-top { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; }
.hud-card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 14px;
  padding: 9px 16px; backdrop-filter: blur(10px); min-width: 88px; box-shadow: 0 0 16px rgba(0,0,0,0.4);
}
.hud-label { color: var(--muted); font-size: 11px; letter-spacing: 0.2em; margin-bottom: 2px; }
.hud-rank, .hud-lap { font-family: var(--font-title); font-size: 30px; font-weight: 700; line-height: 1; font-variant-numeric: tabular-nums; }
.hud-rank { color: var(--cyan); text-shadow: var(--glow-cyan); }
.hud-lap { color: #fff; }
.hud-rank small, .hud-lap small { font-size: 13px; color: var(--muted); font-weight: 500; margin-left: 2px; font-family: var(--font); }
.hud-time .hud-clock { font-family: var(--font-title); font-size: 24px; font-weight: 700; font-variant-numeric: tabular-nums; color: #fff; }
.hud-best { color: var(--gold); font-size: 12px; margin-top: 2px; }

/* 撞击计数：撞到会短暂高亮，给"对抗"一个可见的计分 */
.hud-hit { min-width: 74px; }
.hud-hit .hud-hit-num, .hud-hit span { font-family: var(--font-title); font-size: 30px; font-weight: 700; line-height: 1; color: #ff9a3c; text-shadow: 0 0 14px rgba(255,140,40,0.55); font-variant-numeric: tabular-nums; }
.hud-hit small { font-size: 13px; color: var(--muted); font-weight: 500; margin-left: 2px; font-family: var(--font); }
.hud-hit.bump { animation: hitPop 0.34s ease-out; }
@keyframes hitPop {
  0%   { transform: scale(1);    box-shadow: 0 0 0 rgba(255,150,40,0); }
  28%  { transform: scale(1.14); box-shadow: 0 0 26px rgba(255,150,40,0.75); }
  100% { transform: scale(1);    box-shadow: 0 0 0 rgba(255,150,40,0); }
}

/* 小地图 */
.hud-minimap { position: absolute; top: max(12px, env(safe-area-inset-top)); right: max(12px, env(safe-area-inset-right)); text-align: center; }
.mini-frame {
  padding: 6px; border-radius: 16px; background: var(--panel);
  border: 1px solid var(--line); box-shadow: var(--glow-purple); backdrop-filter: blur(8px);
}
#minimap { display: block; border-radius: 10px; }
.hud-pos-badge {
  margin-top: 6px; font-family: var(--font-title); font-size: 13px; letter-spacing: 0.08em;
  color: var(--muted);
}
.hud-pos-badge span { color: var(--purple); font-weight: 700; text-shadow: var(--glow-purple); }

/* 圆形速度表 */
.hud-speedo { position: absolute; left: max(16px, env(safe-area-inset-left)); bottom: max(18px, env(safe-area-inset-bottom)); width: 168px; height: 168px; }
.speedo-svg { width: 168px; height: 168px; overflow: visible; }
.speedo-track { fill: none; stroke: rgba(255,255,255,0.1); stroke-width: 9; }
.speedo-arc {
  fill: none; stroke: url(#speedGrad); stroke-width: 9; stroke-linecap: round;
  transform: rotate(-90deg); transform-origin: 100px 100px;
  filter: drop-shadow(0 0 6px rgba(196,0,255,0.7));
}
.speedo-needle { transform-origin: 100px 100px; transition: transform 0.08s linear; }
.speedo-needle line { stroke: #fff; stroke-width: 4; stroke-linecap: round; filter: drop-shadow(0 0 5px var(--cyan)); }
.speedo-hub { fill: #fff; filter: drop-shadow(0 0 6px var(--purple)); }
.speedo-center {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -54%); text-align: center;
}
.speed-num { font-family: var(--font-title); font-weight: 900; font-size: 44px; line-height: 0.9; font-variant-numeric: tabular-nums; color: #fff; text-shadow: 0 0 22px rgba(0,229,255,0.5); }
.speed-unit { color: var(--cyan); letter-spacing: 0.24em; font-size: 11px; margin-top: 2px; }
.speedo-gear {
  position: absolute; top: calc(50% + 44px); left: 50%; transform: translate(-50%, 0);
  font-family: var(--font-title); font-size: 14px; color: var(--purple); letter-spacing: 0.1em;
  text-shadow: var(--glow-purple);
}
.speedo-gear span { color: #fff; font-weight: 700; }

/* 三段式氮气 */
.hud-nitro { position: absolute; right: max(16px, env(safe-area-inset-right)); bottom: max(20px, env(safe-area-inset-bottom)); text-align: center; }
.nitro-label { color: var(--gold); letter-spacing: 0.28em; font-size: 10px; margin-bottom: 6px; font-family: var(--font-title); }
.nitro-track { display: flex; flex-direction: column; gap: 4px; height: 180px; width: 28px; }
.nitro-seg {
  flex: 1; border-radius: 6px; position: relative; overflow: hidden;
  background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.12);
}
.nitro-seg::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(to top, var(--c), color-mix(in srgb, var(--c) 55%, #fff));
  clip-path: inset(calc((1 - var(--fill, 0)) * 100%) 0 0 0);
  box-shadow: 0 0 14px var(--c);
}
.nitro-yellow { --c: #ffcc00; }
.nitro-orange { --c: #ff6b00; }
.nitro-blue { --c: #00e5ff; }

/* 漂移分 */
.hud-drift {
  position: absolute; left: 50%; top: 64%; transform: translate(-50%, 0);
  text-align: center; opacity: 0; transition: opacity 0.2s ease; pointer-events: none;
}
.hud-drift.show { opacity: 1; }
.drift-score { display: block; font-family: var(--font-title); font-weight: 900; font-size: clamp(34px, 7vw, 56px); color: var(--purple); text-shadow: 0 0 30px rgba(196,0,255,0.8); font-variant-numeric: tabular-nums; }
.drift-combo { display: block; font-family: var(--font-title); font-size: 16px; color: var(--cyan); letter-spacing: 0.06em; text-shadow: var(--glow-cyan); }
.hud-drift small { color: var(--muted); font-size: 12px; letter-spacing: 0.2em; }

.hud-msg {
  position: absolute; left: 50%; top: 17%; transform: translateX(-50%);
  font-family: var(--font-title); font-size: clamp(26px, 6vw, 46px); font-weight: 700; letter-spacing: 0.1em;
  color: var(--gold); text-shadow: 0 0 30px rgba(255,212,0,0.6);
  opacity: 0; transition: opacity 0.25s ease; text-align: center; width: 90%;
}
.hud-msg.show { opacity: 1; }

.hud-count {
  position: absolute; left: 50%; top: 42%; transform: translate(-50%, -50%);
  font-family: var(--font-title); font-size: clamp(72px, 18vw, 150px); font-weight: 900;
  color: #fff; text-shadow: 0 0 50px var(--purple), 0 0 100px var(--cyan); letter-spacing: 0.08em;
}

/* Touch */
#touch { position: absolute; inset: 0; z-index: 12; pointer-events: none; }
.touch-left, .touch-right { position: absolute; bottom: max(18px, env(safe-area-inset-bottom)); display: flex; gap: 12px; align-items: flex-end; pointer-events: none; }
.touch-left { left: max(16px, env(safe-area-inset-left)); }
.touch-right { right: max(16px, env(safe-area-inset-right)); }
.tbtn {
  pointer-events: auto; width: 72px; height: 72px; border-radius: 20px;
  border: 1px solid rgba(255,255,255,0.18); background: rgba(20, 12, 36, 0.55);
  color: var(--ink); font: 700 16px/1 var(--font); backdrop-filter: blur(8px); cursor: pointer;
  transition: transform 0.1s, background 0.1s, border-color 0.1s;
}
.tbtn:active, .tbtn.down { background: rgba(196, 0, 255, 0.45); border-color: var(--purple); transform: scale(0.96); }
.tbtn-gas { width: 88px; height: 88px; background: rgba(0, 229, 255, 0.22); border-color: rgba(0, 229, 255, 0.5); }
.tbtn-nitro { width: 72px; height: 72px; background: rgba(255, 212, 0, 0.2); border-color: rgba(255, 212, 0, 0.5); color: var(--gold); }
.tbtn-steer { width: 78px; height: 78px; font-size: 22px; }

/* Modal */
.modal {
  width: min(92vw, 480px); background: var(--panel); border: 1px solid var(--line);
  border-radius: 22px; padding: 32px 28px; text-align: center; backdrop-filter: blur(16px);
  box-shadow: 0 30px 80px rgba(0,0,0,0.5), var(--glow-purple);
}
.modal h2 { font-family: var(--font-title); font-size: 26px; letter-spacing: 0.08em; margin-bottom: 20px; }
.modal-actions { display: flex; flex-direction: column; gap: 10px; margin-top: 8px; }
.how-modal .how-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; text-align: left; margin: 8px 0 16px; }
.how-modal .how-grid > div { background: rgba(255,255,255,0.04); border: 1px solid var(--line); border-radius: 14px; padding: 14px; font-size: 13px; line-height: 1.7; color: var(--muted); }
.how-modal .how-grid b { color: var(--ink); font-size: 14px; }
.how-tip { color: var(--muted); font-size: 13px; margin-bottom: 18px; line-height: 1.7; }

.result-modal .result-kicker { color: var(--cyan); letter-spacing: 0.32em; font-size: 12px; margin-bottom: 8px; font-family: var(--font-title); }
.result-rank {
  font-family: var(--font-title); font-size: 72px; font-weight: 900; letter-spacing: 0.06em;
  background: linear-gradient(120deg, var(--gold), var(--orange));
  -webkit-background-clip: text; background-clip: text; color: transparent; margin: 8px 0 18px;
  filter: drop-shadow(0 0 18px rgba(255,212,0,0.5));
}
.result-rows { display: flex; flex-direction: column; gap: 8px; margin-bottom: 18px; }
.result-rows .row { display: flex; justify-content: space-between; padding: 10px 14px; background: rgba(255,255,255,0.04); border-radius: 12px; font-size: 14px; }
.result-rows .row b { font-variant-numeric: tabular-nums; font-family: var(--font-title); }

/* Mobile */
@media (max-width: 720px) {
  .garage-body { grid-template-columns: 1fr; grid-template-rows: 36% 1fr; }
  .garage-stage { display: none; }
  .garage-hint { display: none; }
  .car-list { flex-direction: row; overflow-x: auto; overflow-y: hidden; padding-bottom: 6px; }
  .car-item { min-width: 168px; flex-direction: column; align-items: flex-start; }
  .car-swatch { width: 100%; height: 6px; }
  .menu-stats { gap: 16px; }
  .menu-stats b { font-size: 22px; }
  .hud-speedo { width: 132px; height: 132px; }
  .speedo-svg { width: 132px; height: 132px; }
  .speed-num { font-size: 34px; }
  .nitro-track { height: 140px; }
  .hud-minimap { transform: scale(0.85); transform-origin: top right; }
  .how-modal .how-grid { grid-template-columns: 1fr; }
  .tbtn { width: 64px; height: 64px; }
  .tbtn-gas { width: 78px; height: 78px; }
}
@media (hover: none) and (pointer: coarse) {
  #touch.playing { display: block !important; }
}