/* ===========================================================================
   NANOBOT · Puzzle Chambers — minimal HUD
   =========================================================================== */
:root{
  --ink:#eafbff;
  --muted:#8fb4c8;
  --accent:#35d6ff;
  --cyan:#59f0ff;
  --green:#7CFFB0;
  --amber:#ffd23c;
  --danger:#ff5d7a;
  --mono:"DM Mono",ui-monospace,"Cascadia Mono",Consolas,monospace;
  --font:"Rajdhani","Segoe UI",system-ui,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
html,body{height:100%;overflow:hidden;background:#05070c;color:var(--ink);font-family:var(--font);user-select:none}
canvas#game{position:fixed;inset:0;width:100vw;height:100vh;display:block;cursor:grab}
canvas#game:active{cursor:grabbing}
#ui{position:fixed;inset:0;pointer-events:none;z-index:10}

/* loader */
#loading{position:fixed;inset:0;z-index:50;display:flex;flex-direction:column;gap:16px;align-items:center;justify-content:center;
  background:radial-gradient(circle at 50% 42%,#0a1424,#04060a);transition:opacity .5s,visibility .5s}
#loading.gone{opacity:0;visibility:hidden}
.loader-bot{font-size:58px;color:var(--green);animation:spin 1.1s linear infinite;text-shadow:0 0 22px var(--accent)}
.loader-text{font-family:var(--mono);letter-spacing:3px;color:var(--muted);font-size:13px}
.load-err{color:#ff7a90;text-align:center;line-height:1.7;font-family:var(--mono)}
@keyframes spin{to{transform:rotate(360deg)}}

/* room name (top-left) */
.hud-name{position:absolute;top:20px;left:24px;font-family:var(--mono);font-size:15px;letter-spacing:2px;
  color:var(--accent);text-shadow:0 0 14px rgba(53,214,255,.45);text-transform:uppercase}

/* hint (bottom-center) */
.hud-hint{position:absolute;left:50%;bottom:64px;transform:translateX(-50%);max-width:min(680px,86vw);text-align:center;
  font-size:16px;letter-spacing:.4px;color:var(--ink);background:rgba(6,14,22,.62);border:1px solid rgba(53,214,255,.25);
  padding:10px 18px;border-radius:12px;backdrop-filter:blur(6px);opacity:0;transition:opacity .4s}
.hud-hint.show{opacity:1}

/* controls legend (bottom-left) — key chips */
.hud-controls{position:absolute;left:24px;bottom:18px;display:flex;flex-wrap:wrap;gap:6px 10px;max-width:min(560px,60vw);
  font-family:var(--mono);font-size:11px;letter-spacing:.5px;color:#7f9aac}
.hud-controls .leg{display:inline-flex;align-items:center;gap:6px}
.hud-controls kbd{font-family:var(--mono);font-size:10px;line-height:1;color:var(--accent);
  background:rgba(53,214,255,.08);border:1px solid rgba(53,214,255,.28);border-bottom-width:2px;
  border-radius:5px;padding:3px 6px;text-transform:uppercase;letter-spacing:1px}
.hud-controls .leg-d{color:#5f7a8c}

/* banner (center) */
.hud-banner{position:absolute;inset:0;display:flex;flex-direction:column;gap:10px;align-items:center;justify-content:center;
  opacity:0;transform:scale(.9);transition:.5s cubic-bezier(.2,.9,.3,1.3);pointer-events:none}
.hud-banner.show{opacity:1;transform:scale(1)}
.bn-glow{position:absolute;width:min(120vw,900px);height:2px;top:50%;left:50%;transform:translate(-50%,-40px);
  background:linear-gradient(90deg,transparent,var(--green),transparent);opacity:0;filter:blur(1px)}
.hud-banner.show .bn-glow{animation:bnsweep .9s ease-out}
.bn-main{position:relative;font-size:clamp(30px,6vw,52px);font-weight:800;letter-spacing:6px;color:#fff;
  text-shadow:0 0 30px var(--green),0 0 60px rgba(124,255,176,.4)}
.hud-banner.show .bn-main{animation:bnpop .6s cubic-bezier(.2,1.4,.4,1) both}
.bn-sub{font-family:var(--mono);font-size:clamp(12px,2.4vw,15px);letter-spacing:2px;color:var(--green);opacity:.9}
.hud-banner.show .bn-sub{animation:bnrise .5s .12s ease-out both}
/* per-kind accents */
.hud-banner.unlock .bn-main{text-shadow:0 0 30px var(--accent),0 0 60px rgba(53,214,255,.4)}
.hud-banner.unlock .bn-sub{color:var(--accent)}
.hud-banner.unlock .bn-glow{background:linear-gradient(90deg,transparent,var(--accent),transparent)}
.hud-banner.win .bn-main{color:#fff;text-shadow:0 0 26px var(--amber),0 0 70px rgba(255,210,60,.5);
  animation:bnpop .6s cubic-bezier(.2,1.4,.4,1) both, bnshine 2.4s .6s ease-in-out infinite}
.hud-banner.win .bn-sub{color:var(--amber)}
.hud-banner.win .bn-glow{background:linear-gradient(90deg,transparent,var(--amber),transparent)}
@keyframes bnpop{0%{opacity:0;transform:translateY(10px) scale(.7)}60%{opacity:1;transform:translateY(0) scale(1.06)}100%{transform:scale(1)}}
@keyframes bnrise{from{opacity:0;transform:translateY(8px)}to{opacity:.9;transform:translateY(0)}}
@keyframes bnsweep{0%{opacity:0;transform:translate(-50%,-40px) scaleX(.2)}40%{opacity:1}100%{opacity:0;transform:translate(-50%,-40px) scaleX(1)}}
@keyframes bnshine{0%,100%{filter:brightness(1)}50%{filter:brightness(1.35)}}

/* room number chip in the name */
.rn-num{font-family:var(--mono);color:var(--muted);font-size:.8em;margin-right:8px}
.hud-controls .dim{color:#5f7a8c}

/* core counter (top-right) */
.hud-cores{position:absolute;top:18px;right:24px;font-family:var(--mono);font-size:20px;letter-spacing:1px;
  color:var(--cyan);text-shadow:0 0 12px rgba(89,240,255,.5);transform-origin:right center}
.hud-cores.done{color:var(--green);text-shadow:0 0 14px rgba(124,255,176,.6)}
.hud-cores.hidden{display:none}
.hud-cores.pop{animation:corepop .5s cubic-bezier(.2,1.5,.4,1)}
.hud-cores.pop .cc-n{display:inline-block;animation:corenum .5s cubic-bezier(.2,1.5,.4,1)}
@keyframes corepop{0%{transform:scale(1)}35%{transform:scale(1.28)}100%{transform:scale(1)}}
@keyframes corenum{0%{color:#fff;text-shadow:0 0 20px var(--accent)}100%{}}

/* chambers button + select panel */
.hud-menu-btn{position:absolute;top:52px;right:24px;pointer-events:auto;cursor:pointer;font-family:var(--mono);
  font-size:12px;letter-spacing:1px;color:var(--accent);background:rgba(8,16,24,.6);border:1px solid rgba(53,214,255,.3);
  padding:6px 12px;border-radius:10px}
.hud-menu-btn:hover{background:rgba(53,214,255,.12)}
.room-select{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  background:rgba(4,7,12,.72);backdrop-filter:blur(8px);pointer-events:auto;animation:rsfade .2s ease-out}
.room-select.hidden{display:none}
@keyframes rsfade{from{opacity:0}to{opacity:1}}
.rs-panel{position:relative;width:min(820px,92vw);max-height:86vh;overflow:auto;padding:26px 26px 30px;
  background:radial-gradient(120% 120% at 50% 0,rgba(14,26,40,.96),rgba(6,11,18,.96));
  border:1px solid rgba(53,214,255,.22);border-radius:18px;box-shadow:0 0 60px rgba(53,214,255,.12);
  animation:rspop .28s cubic-bezier(.2,1.2,.4,1)}
@keyframes rspop{from{opacity:0;transform:translateY(14px) scale(.97)}to{opacity:1;transform:none}}
.rs-close{position:absolute;top:14px;right:14px;pointer-events:auto;cursor:pointer;width:32px;height:32px;
  font-family:var(--mono);font-size:14px;color:var(--muted);background:rgba(8,16,24,.6);
  border:1px solid rgba(53,214,255,.24);border-radius:9px}
.rs-close:hover{color:var(--ink);border-color:var(--accent)}
.rs-head{font-family:var(--mono);letter-spacing:4px;color:var(--accent);text-align:center;
  margin-bottom:20px;font-size:16px;text-shadow:0 0 16px rgba(53,214,255,.4)}
.rs-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:10px}
.rs-item{display:flex;align-items:center;gap:10px;pointer-events:auto;cursor:pointer;text-align:left;
  background:rgba(12,22,34,.8);border:1px solid rgba(53,214,255,.22);border-radius:12px;padding:11px 14px;
  color:var(--ink);font-family:var(--font);transition:transform .12s,border-color .12s,box-shadow .12s}
.rs-item:hover{border-color:var(--accent);box-shadow:0 0 16px rgba(53,214,255,.25);transform:translateY(-2px)}
.rs-item.locked{opacity:.45;cursor:not-allowed}
.rs-item.locked:hover{transform:none;box-shadow:none;border-color:rgba(53,214,255,.22)}
.rs-item.done{border-color:rgba(124,255,176,.4);background:rgba(14,30,26,.8)}
.rs-item.done:hover{box-shadow:0 0 16px rgba(124,255,176,.28)}
.rs-n{font-family:var(--mono);color:var(--muted);font-size:13px}
.rs-name{flex:1;font-weight:600;font-size:14px}
.rs-mark{color:var(--green);font-size:15px}
.rs-item.locked .rs-mark{color:var(--muted)}

/* mute button (top-right, under chambers) */
.hud-mute-btn{position:absolute;top:52px;right:150px;pointer-events:auto;cursor:pointer;width:32px;height:32px;
  font-family:var(--mono);font-size:14px;color:var(--accent);background:rgba(8,16,24,.6);
  border:1px solid rgba(53,214,255,.3);border-radius:10px;line-height:1}
.hud-mute-btn:hover{background:rgba(53,214,255,.12)}
.hud-mute-btn.off{color:var(--muted);border-color:rgba(143,180,200,.3)}

/* respawn flash */
.hud-flash{position:absolute;inset:0;pointer-events:none;opacity:0;z-index:5}
.hud-flash.void{background:radial-gradient(circle at 50% 50%,transparent 40%,rgba(53,214,255,.28))}
.hud-flash.hazard{background:radial-gradient(circle at 50% 50%,transparent 35%,rgba(255,93,122,.34))}
.hud-flash.on{animation:flashpulse .46s ease-out}
@keyframes flashpulse{0%{opacity:0}18%{opacity:1}100%{opacity:0}}

/* toasts (bottom-center, above hint) */
.hud-toasts{position:absolute;left:50%;bottom:120px;transform:translateX(-50%);display:flex;flex-direction:column;
  gap:8px;align-items:center;pointer-events:none;z-index:6}
.toast{font-family:var(--mono);font-size:13px;letter-spacing:1px;color:var(--accent);
  background:rgba(6,14,22,.82);border:1px solid rgba(53,214,255,.35);border-radius:20px;padding:8px 16px;
  backdrop-filter:blur(6px);opacity:0;transform:translateY(10px) scale(.9);
  transition:opacity .28s,transform .28s cubic-bezier(.2,1.3,.4,1);box-shadow:0 0 18px rgba(53,214,255,.18)}
.toast.in{opacity:1;transform:translateY(0) scale(1)}
.toast.out{opacity:0;transform:translateY(-8px) scale(.96)}
.toast.tp{color:var(--green);border-color:rgba(124,255,176,.4);box-shadow:0 0 18px rgba(124,255,176,.18)}
.toast.burrow{color:var(--amber);border-color:rgba(255,210,60,.4);box-shadow:0 0 18px rgba(255,210,60,.18)}

/* title / start overlay */
.hud-title{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;pointer-events:auto;
  background:radial-gradient(circle at 50% 38%,rgba(10,20,36,.92),rgba(4,6,10,.96));z-index:20;
  transition:opacity .55s ease,visibility .55s}
.hud-title.gone{opacity:0;visibility:hidden;pointer-events:none}
.tl-card{display:flex;flex-direction:column;align-items:center;text-align:center;gap:14px;
  width:min(560px,90vw);padding:36px 30px 32px;
  background:linear-gradient(180deg,rgba(14,26,40,.7),rgba(6,11,18,.7));
  border:1px solid rgba(53,214,255,.22);border-radius:22px;box-shadow:0 0 80px rgba(53,214,255,.14);
  animation:tlin .5s cubic-bezier(.2,1.2,.4,1)}
@keyframes tlin{from{opacity:0;transform:translateY(18px) scale(.97)}to{opacity:1;transform:none}}
.tl-bot{font-size:52px;color:var(--green);text-shadow:0 0 26px var(--accent);animation:spin 3.4s linear infinite}
.tl-name{font-family:var(--font);font-weight:800;font-size:clamp(30px,7vw,46px);letter-spacing:4px;color:#fff;
  text-shadow:0 0 30px rgba(53,214,255,.5);line-height:1}
.tl-dot{color:var(--accent)}
.tl-sub2{color:var(--accent);font-weight:600;letter-spacing:3px}
.tl-tag{color:var(--muted);font-size:15px;letter-spacing:.5px;margin-top:-4px}
.tl-play{pointer-events:auto;cursor:pointer;margin-top:6px;font-family:var(--mono);font-weight:600;
  font-size:16px;letter-spacing:3px;color:#04121a;
  background:linear-gradient(180deg,var(--green),var(--accent));border:none;border-radius:14px;padding:13px 40px;
  box-shadow:0 0 30px rgba(53,214,255,.4);transition:transform .12s,box-shadow .12s}
.tl-play:hover{transform:translateY(-2px);box-shadow:0 0 44px rgba(124,255,176,.55)}
.tl-play:active{transform:translateY(0)}
.tl-legend{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:8px 16px;
  width:100%;max-width:420px;margin-top:12px;padding-top:16px;border-top:1px solid rgba(53,214,255,.14)}
.tl-row{display:flex;align-items:center;gap:8px;font-family:var(--mono);font-size:12px;color:#8fb4c8}
.tl-row kbd{font-family:var(--mono);font-size:10px;color:var(--accent);background:rgba(53,214,255,.08);
  border:1px solid rgba(53,214,255,.28);border-bottom-width:2px;border-radius:5px;padding:3px 6px;
  min-width:44px;text-align:center;text-transform:uppercase;letter-spacing:1px}
.tl-hint{font-family:var(--mono);font-size:11px;letter-spacing:1px;color:#5f7a8c;margin-top:6px}

/* mobile / small screens */
@media (max-width:640px){
  .hud-controls{display:none}
  .hud-menu-btn{font-size:11px;padding:5px 9px}
  .hud-mute-btn{right:120px}
  .hud-name{font-size:12px;top:16px;left:16px}
  .hud-toasts{bottom:96px}
}