:root{
  --bg:#0a0e17;
  --panel:rgba(11,16,26,.72);
  --stroke:rgba(255,255,255,.12);
  --text:#eef2f8;
  --dim:rgba(238,242,248,.55);
  --accent:#06d6a0;
  --hot:#ffbe0b;
  --font:'Segoe UI',system-ui,-apple-system,Roboto,Helvetica,Arial,sans-serif;
  --mono:ui-monospace,'SF Mono',Menlo,Consolas,monospace;
}

*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%;overflow:hidden;background:var(--bg);color:var(--text);font-family:var(--font)}
body{-webkit-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent}
.hidden{display:none !important}

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

/* ── HUD ───────────────────────────────────────────────────────── */
#hud{position:fixed;inset:0;pointer-events:none;padding:max(14px,env(safe-area-inset-top)) max(14px,env(safe-area-inset-right)) max(14px,env(safe-area-inset-bottom)) max(14px,env(safe-area-inset-left))}
.hud-tl{position:absolute;top:14px;left:14px;display:flex;gap:8px}
.hud-tr{position:absolute;top:14px;right:14px;display:flex;flex-direction:column;gap:8px;align-items:flex-end}
.hud-bl{position:absolute;bottom:14px;left:14px}
.hud-br{position:absolute;bottom:6px;right:10px;display:flex;flex-direction:column;align-items:center;gap:6px}

/* nitro meter */
#nitro{
  width:160px;display:flex;align-items:center;gap:8px;
  background:var(--panel);border:1px solid var(--stroke);border-radius:10px;
  padding:6px 9px;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)
}
#nitro b{font-size:9px;letter-spacing:.16em;color:var(--dim)}
#nitro i{flex:1;height:7px;border-radius:4px;background:rgba(255,255,255,.14);position:relative;overflow:hidden}
#nitro i::after{
  content:'';position:absolute;inset:0;
  transform:scaleX(var(--n,1));transform-origin:left;
  background:linear-gradient(90deg,#3a86ff,#7fd4ff);
  transition:transform .08s linear
}
#nitro.active b{color:var(--hot)}
#nitro.active i::after{background:linear-gradient(90deg,#ffbe0b,#fb5607)}
#nitro.low b{color:#e63946}

.panel{
  background:var(--panel);border:1px solid var(--stroke);border-radius:12px;
  padding:8px 12px;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
}
.lap-panel,.pos-panel{display:flex;flex-direction:column;align-items:center;min-width:76px}
.label{font-size:10px;letter-spacing:.18em;color:var(--dim)}
.big{font-family:var(--mono);font-size:30px;font-weight:700;line-height:1.05}
.big small{font-size:14px;color:var(--dim);font-weight:500}
.pos-panel .big{color:var(--hot)}

.timing{min-width:168px;font-family:var(--mono);font-size:13px}
.timing .row{display:flex;justify-content:space-between;gap:14px;padding:1px 0}
.timing .row span{color:var(--dim);font-size:10px;letter-spacing:.14em;align-self:center}
.timing .best b{color:var(--accent)}

.board{list-style:none;min-width:168px;font-size:12px;padding:8px}
.board li{display:flex;align-items:center;gap:7px;padding:3px 2px;opacity:.85}
.board li.me{opacity:1;font-weight:700}
.board .chip{width:9px;height:9px;border-radius:3px;flex:none}
.board .nm{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.board .gap{font-family:var(--mono);font-size:10px;color:var(--dim)}

#minimap{background:var(--panel);border:1px solid var(--stroke);border-radius:14px;backdrop-filter:blur(10px)}

#speedo{position:relative;width:170px;height:158px}
#speedo svg{width:170px;height:170px;position:absolute;top:-8px;left:0}
#speedFill{stroke-dasharray:1 1000;transition:stroke-dasharray .08s linear}
.speed-readout{position:absolute;bottom:26px;left:0;right:0;text-align:center}
#speedValue{font-family:var(--mono);font-size:40px;font-weight:700;letter-spacing:-.02em}
.speed-readout em{display:block;font-size:10px;letter-spacing:.2em;color:var(--dim);font-style:normal}

/* gear readout: R while reversing, N stopped, D driving */
#gear{
  position:absolute;bottom:6px;left:0;right:0;text-align:center;
  font-family:var(--mono);font-size:17px;font-weight:700;line-height:1;
  transition:color .12s
}
#gear.n{color:var(--dim)}
#gear.d{color:var(--accent)}
#gear.r{color:#ff5b5b;text-shadow:0 0 14px rgba(255,91,91,.65)}

#centerMsg{
  position:absolute;top:38%;left:0;right:0;text-align:center;
  font-size:min(15vw,120px);font-weight:800;letter-spacing:-.03em;
  text-shadow:0 8px 40px rgba(0,0,0,.7);opacity:0;transition:opacity .2s
}
#centerMsg.show{opacity:1}
#centerMsg.go{color:var(--accent)}

#lapFlash{
  position:absolute;top:22%;left:0;right:0;text-align:center;
  font-size:22px;font-weight:700;opacity:0;transform:translateY(8px);
  transition:opacity .3s,transform .3s;text-shadow:0 4px 20px rgba(0,0,0,.8)
}
#lapFlash.show{opacity:1;transform:translateY(0)}

/* ── touch controls ────────────────────────────────────────────── */
#touch{position:absolute;inset:0;pointer-events:none}
.tbtn{
  position:absolute;pointer-events:auto;border:1px solid var(--stroke);
  background:rgba(20,26,38,.6);color:var(--text);border-radius:50%;
  font:600 13px/1 var(--font);backdrop-filter:blur(8px)
}
.tbtn:active{background:rgba(6,214,160,.35)}
.tbtn.left {left:20px;bottom:110px;width:78px;height:78px;font-size:24px}
.tbtn.right{left:112px;bottom:110px;width:78px;height:78px;font-size:24px}
.tbtn.gas  {right:20px;bottom:110px;width:92px;height:92px}
.tbtn.brake{right:124px;bottom:120px;width:76px;height:76px;font-size:12px;line-height:1.25}
.tbtn.brake small{display:block;font-size:9px;letter-spacing:.06em;color:var(--dim)}
.tbtn.hand {right:34px;bottom:216px;width:64px;height:64px;font-size:11px}
.tbtn.nitro{right:112px;bottom:216px;width:64px;height:64px;font-size:10px;
  border-color:rgba(127,212,255,.5);color:#bfe6ff}
.tbtn.nitro:active{background:rgba(255,190,11,.4)}

/* ── menu ──────────────────────────────────────────────────────── */
#menu{
  position:fixed;inset:0;display:grid;place-items:center;padding:20px;
  background:radial-gradient(120% 90% at 50% 0%,#16223a 0%,#080b12 62%);
  overflow:auto;z-index:10
}
.menu-card{
  width:min(430px,100%);background:rgba(12,17,28,.86);border:1px solid var(--stroke);
  border-radius:20px;padding:26px;backdrop-filter:blur(16px);
  box-shadow:0 30px 80px rgba(0,0,0,.6)
}
h1{font-size:40px;letter-spacing:-.04em;font-weight:800;line-height:1}
h1 span{color:var(--accent)}
h2{font-size:19px;margin-bottom:12px}
.tag{color:var(--dim);font-size:13px;margin:6px 0 20px}

label{display:block;font-size:11px;letter-spacing:.14em;color:var(--dim);margin-bottom:12px}
input{
  width:100%;margin-top:6px;padding:12px 14px;border-radius:11px;
  border:1px solid var(--stroke);background:rgba(255,255,255,.05);
  color:var(--text);font-size:15px;font-family:var(--font)
}
input:focus{outline:none;border-color:var(--accent)}
#roomInput{text-transform:uppercase;font-family:var(--mono);letter-spacing:.16em}

button{cursor:pointer;font-family:var(--font)}
.primary{
  width:100%;padding:14px;border:none;border-radius:11px;font-size:15px;font-weight:700;
  background:linear-gradient(135deg,#06d6a0,#3a86ff);color:#04121a;margin-top:4px
}
.primary:disabled{opacity:.45;cursor:default}
.ghost{background:transparent;border:1px solid var(--stroke);color:var(--dim);
  border-radius:8px;padding:5px 10px;font-size:11px}
.hint{font-size:11.5px;color:var(--dim);margin-top:10px;text-align:center}

.room-line{display:flex;align-items:center;gap:10px;margin-bottom:14px;font-size:13px;color:var(--dim)}
.room-line b{font-family:var(--mono);font-size:17px;color:var(--hot);letter-spacing:.16em}
.room-line .ghost{margin-left:auto}

#playerList,#resultList{list-style:none;margin-bottom:16px}
#playerList li,#resultList li{
  display:flex;align-items:center;gap:10px;padding:9px 11px;font-size:14px;
  border:1px solid var(--stroke);border-radius:10px;margin-bottom:6px;
  background:rgba(255,255,255,.03)
}
#resultList li:first-child{border-color:var(--hot);background:rgba(255,190,11,.1)}
.dot{width:11px;height:11px;border-radius:4px;flex:none}
.who{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.badge{font-size:10px;letter-spacing:.1em;color:var(--dim);border:1px solid var(--stroke);
  border-radius:20px;padding:2px 8px}
.badge.ok{color:#04121a;background:var(--accent);border-color:transparent}
.place{font-family:var(--mono);font-weight:700;width:22px;color:var(--dim)}
.rtime{font-family:var(--mono);font-size:12px;color:var(--dim)}

.bot-row{display:flex;align-items:center;justify-content:space-between;
  font-size:13px;padding:10px 2px 16px;color:var(--dim)}
.stepper{display:flex;align-items:center;gap:12px}
.stepper button{width:32px;height:32px;border-radius:9px;border:1px solid var(--stroke);
  background:rgba(255,255,255,.05);color:var(--text);font-size:17px;line-height:1}
.stepper b{font-family:var(--mono);font-size:16px;min-width:14px;text-align:center;color:var(--text)}

.controls{margin-top:18px;border-top:1px solid var(--stroke);padding-top:12px}
summary{font-size:12px;color:var(--dim);cursor:pointer}
.keys{display:grid;grid-template-columns:1fr 1fr;gap:6px 12px;margin-top:10px;font-size:11.5px;color:var(--dim)}
kbd{background:rgba(255,255,255,.09);border:1px solid var(--stroke);border-radius:5px;
  padding:1px 5px;font-family:var(--mono);font-size:10.5px;color:var(--text)}
.conn{font-size:11px;color:var(--dim);text-align:center;margin-top:12px}
.conn.live{color:var(--accent)}
.conn.down{color:#e63946}

@media (max-width:620px){
  .hud-tr .board{display:none}
  #speedo{width:130px;height:126px}
  #speedo svg{width:130px;height:130px}
  #speedValue{font-size:30px}
  #minimap{width:120px;height:120px}
  #nitro{width:126px;padding:5px 7px;gap:6px}
  .big{font-size:24px}
  .menu-card{padding:20px}
  h1{font-size:32px}
}