:root{
  --bg:#080b12; --bg2:#0d1220; --fg:#e7edf7; --mut:#8ea0be;
  --neon:#37f5c5; --neon2:#5aa9ff; --hot:#ff5d7a; --gold:#ffcf5a; --line:#1d2740;
  --up:#26d97f; --down:#ff5d7a;
  font-family:-apple-system,"PingFang TC","Noto Sans TC",Segoe UI,Roboto,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%;background:var(--bg);color:var(--fg);overflow:hidden}
canvas#game{position:fixed;inset:0;width:100vw;height:100vh;display:block}

/* ---------- 選單 ---------- */
#menu,#result{position:fixed;inset:0;display:flex;flex-direction:column;align-items:center;
  justify-content:center;gap:20px;z-index:20;
  background:radial-gradient(1200px 700px at 50% -10%,rgba(55,245,197,.10),transparent 60%),
             linear-gradient(180deg,#070a10 0%,#0a0f1c 100%);}
.hidden{display:none!important}
.menu-card{width:min(520px,92vw);background:linear-gradient(180deg,rgba(20,27,45,.92),rgba(11,16,28,.95));
  border:1px solid var(--line);border-radius:20px;padding:28px 30px;
  box-shadow:0 30px 90px rgba(0,0,0,.6),inset 0 1px 0 rgba(255,255,255,.04);}
h1{font-size:38px;letter-spacing:2px;font-weight:800;line-height:1}
h1 span{color:var(--neon);text-shadow:0 0 24px rgba(55,245,197,.55)}
.sub{color:var(--mut);margin:10px 0 22px;font-size:14px;line-height:1.6}
.group{margin:16px 0}
label{display:block;font-size:12px;color:var(--mut);text-transform:uppercase;letter-spacing:1px;margin-bottom:8px}
.seg{display:flex;gap:8px}
.seg button{flex:1;background:#0c1322;border:1px solid var(--line);color:var(--fg);
  padding:12px 8px;border-radius:12px;cursor:pointer;font-size:15px;font-weight:700;
  display:flex;flex-direction:column;gap:3px;align-items:center;transition:.15s}
.seg button small{font-size:10px;color:var(--mut);font-weight:500}
.seg button:hover{border-color:var(--neon2)}
.seg button.active{background:linear-gradient(180deg,rgba(55,245,197,.18),rgba(55,245,197,.06));
  border-color:var(--neon);color:#fff;box-shadow:0 0 20px rgba(55,245,197,.25)}
.room-row{display:flex;gap:8px}
#room-code{flex:1;background:#0c1322;border:1px solid var(--line);color:#fff;border-radius:12px;
  padding:12px 14px;font-size:18px;letter-spacing:3px;text-transform:uppercase;font-weight:800}
#room-code:focus{outline:none;border-color:var(--neon)}
#btn-rand{background:#0c1322;border:1px solid var(--line);color:var(--mut);border-radius:12px;padding:0 16px;cursor:pointer}
.room-status{font-size:13px;color:var(--gold);margin-top:8px;min-height:18px}
button.start{width:100%;margin-top:18px;padding:15px;border:none;border-radius:14px;cursor:pointer;
  font-size:17px;font-weight:800;letter-spacing:1px;color:#04120d;
  background:linear-gradient(90deg,var(--neon),#7dffd8);box-shadow:0 10px 30px rgba(55,245,197,.35);transition:.15s}
button.start:hover{transform:translateY(-2px);box-shadow:0 14px 40px rgba(55,245,197,.5)}
button.ghost{width:100%;margin-top:10px;padding:12px;border:1px solid var(--line);border-radius:12px;
  background:transparent;color:var(--mut);cursor:pointer}
.loading{text-align:center;color:var(--neon);margin-top:12px;font-size:14px}
.help{margin-top:22px;border-top:1px solid var(--line);padding-top:16px;display:grid;gap:6px;font-size:12.5px;color:var(--mut)}
.help b{color:var(--neon2);font-family:monospace}
footer{color:#4b5a78;font-size:12px}

/* ---------- HUD ---------- */
#hud{position:fixed;inset:0;z-index:10;pointer-events:none;font-variant-numeric:tabular-nums}
.hud-top{position:absolute;top:16px;left:50%;transform:translateX(-50%);display:flex;gap:10px;flex-wrap:wrap;justify-content:center}
.pill{background:rgba(10,15,26,.72);border:1px solid var(--line);border-radius:999px;
  padding:8px 16px;font-size:14px;font-weight:700;backdrop-filter:blur(8px)}
#hud-time{color:var(--gold)} #hud-ma{color:var(--neon)} #hud-progress{color:var(--neon2)}
.pill.boost{display:flex;align-items:center;gap:8px}
.pill.boost span{font-size:10px;color:var(--mut);letter-spacing:1px}
.pill.boost i{display:block;width:70px;height:8px;border-radius:4px;background:#122;overflow:hidden;position:relative}
.pill.boost i::after{content:"";position:absolute;inset:0;width:var(--b,100%);
  background:linear-gradient(90deg,var(--hot),var(--gold));border-radius:4px;transition:width .1s}
.hud-candle{position:absolute;left:16px;bottom:16px;background:rgba(10,15,26,.72);border:1px solid var(--line);
  border-radius:12px;padding:10px 14px;font-size:12.5px;line-height:1.7;backdrop-filter:blur(8px);font-family:monospace;min-width:210px}
.hud-hint{position:absolute;bottom:18px;left:50%;transform:translateX(-50%);color:var(--mut);font-size:12px;
  background:rgba(10,15,26,.6);padding:6px 16px;border-radius:999px;border:1px solid var(--line);white-space:nowrap}
.result-card{text-align:center}
.result-card h2{font-size:26px;margin-bottom:6px}
.result-time{font-size:52px;font-weight:800;color:var(--gold);text-shadow:0 0 30px rgba(255,207,90,.4);margin:6px 0}
.result-detail{color:var(--mut);font-size:14px;line-height:1.8;margin-bottom:18px}
@media(max-width:560px){.hud-hint{font-size:10px}.hud-candle{font-size:11px;min-width:0}}