*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
html,body{width:100%;height:100%;overflow:hidden;background:#06102a;color:#eaf4ff;
  font-family:system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  touch-action:none;overscroll-behavior:none;user-select:none;-webkit-user-select:none}
#scene{position:fixed;inset:0;width:100%;height:100%;display:block;touch-action:none}
.hidden{display:none!important}

.glass{background:rgba(10,24,56,.62);border:1px solid rgba(120,220,255,.35);
  box-shadow:0 10px 40px rgba(0,0,0,.4),inset 0 0 30px rgba(60,180,255,.08);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-radius:18px}

/* HUD */
#hud{position:fixed;inset:0;pointer-events:none}
.hud-top{position:absolute;top:max(10px,env(safe-area-inset-top));left:50%;transform:translateX(-50%);
  width:min(420px,70vw);text-align:center}
.stage-label{font-weight:700;font-size:clamp(14px,2.4vw,18px);letter-spacing:.04em;text-shadow:0 2px 8px #000a}
.bar{position:relative;height:10px;margin:6px 0;border-radius:99px;background:rgba(255,255,255,.18);
  border:1px solid rgba(255,255,255,.35);overflow:hidden}
#barFill{height:100%;width:0;background:linear-gradient(90deg,#27d3ff,#7a5cff);border-radius:99px}
.bar i{position:absolute;top:0;bottom:0;width:2px;background:rgba(255,255,255,.55)}
.coords{font:12px ui-monospace,Consolas,monospace;color:#bfe9ff;text-shadow:0 1px 6px #000}
.toast{position:absolute;top:22%;left:50%;transform:translate(-50%,-10px);opacity:0;transition:.3s;
  background:rgba(255,40,90,.85);padding:10px 18px;border-radius:12px;font-weight:700;white-space:nowrap}
.toast.show{opacity:1;transform:translate(-50%,0)}
.toast.ok{background:rgba(20,190,120,.88)}

/* Overlays */
.overlay{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;padding:16px;
  background:rgba(3,8,24,.45);z-index:10;touch-action:auto}
.overlay.side{background:transparent;justify-content:flex-start;padding-left:4vw}
.card{padding:clamp(18px,3vw,32px);width:min(560px,100%);max-height:100%;overflow:auto}
.chip{display:inline-block;font-size:12px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;
  color:#7fe7ff;border:1px solid rgba(127,231,255,.5);border-radius:99px;padding:4px 12px;margin-bottom:12px}
h1{font-size:clamp(26px,5vw,40px);line-height:1.1;margin-bottom:10px}
h2{font-size:clamp(20px,3.4vw,26px);line-height:1.2;margin-bottom:10px}
.sub{color:#cfe4f8;line-height:1.5;margin-bottom:14px;font-size:15px}
.controls{display:grid;gap:8px;margin:12px 0 20px;font-size:14px}
.controls b{display:block;color:#7fe7ff;margin-bottom:2px}
.controls span{color:#cfe4f8;line-height:1.7}
kbd{display:inline-block;min-width:24px;padding:1px 6px;margin:0 2px;border-radius:6px;text-align:center;
  background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.3);font:12px ui-monospace,monospace}
.btn{display:inline-block;padding:13px 22px;border-radius:12px;border:1px solid rgba(127,231,255,.6);
  background:rgba(255,255,255,.08);color:#fff;font:700 15px inherit;cursor:pointer;text-decoration:none;text-align:center}
.btn:hover{background:rgba(255,255,255,.18)}
.btn.primary{background:linear-gradient(135deg,#1fb8ff,#6a5cff);border-color:transparent}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}

/* Quiz */
.quiz-card .question{font-size:clamp(16px,2.6vw,19px);line-height:1.45;margin-bottom:16px}
.options{display:grid;gap:10px}
.opt{display:flex;gap:12px;align-items:center;text-align:left;width:100%;padding:13px 14px;border-radius:12px;
  color:#fff;background:rgba(255,255,255,.08);border:1px solid rgba(127,231,255,.4);font:600 15px/1.35 inherit;cursor:pointer}
.opt:hover{background:rgba(255,255,255,.18)}
.opt .n{flex:none;width:28px;height:28px;border-radius:50%;display:grid;place-items:center;
  background:rgba(127,231,255,.25);font-weight:800}
.opt.wrong{background:rgba(255,50,80,.55);border-color:#ff6b86;animation:shake .4s}
.opt.right{background:rgba(25,190,120,.6);border-color:#4dffb0}
.feedback{min-height:24px;margin-top:12px;font-weight:700}
.feedback.bad{color:#ff7a92}.feedback.good{color:#5dffb6}
.hint{margin-top:6px;font-size:12px;color:#9db7d1}
@keyframes shake{25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}

.summary{list-style:none;display:grid;gap:6px;font-size:14px;color:#dcecfb}
.summary li::before{content:"✓ ";color:#5dffb6;font-weight:800}

/* Touch */
#touch{position:fixed;inset:0;pointer-events:none;z-index:5}
#joy{position:absolute;left:max(18px,env(safe-area-inset-left));bottom:max(22px,env(safe-area-inset-bottom));
  width:130px;height:130px;border-radius:50%;pointer-events:auto;touch-action:none;
  background:rgba(255,255,255,.1);border:2px solid rgba(127,231,255,.5);backdrop-filter:blur(4px)}
#knob{position:absolute;left:50%;top:50%;width:56px;height:56px;margin:-28px 0 0 -28px;border-radius:50%;
  background:rgba(127,231,255,.6);border:2px solid #fff}
#jumpBtn{position:absolute;right:max(22px,env(safe-area-inset-right));bottom:max(30px,env(safe-area-inset-bottom));
  width:96px;height:96px;border-radius:50%;pointer-events:auto;touch-action:none;
  background:rgba(106,92,255,.55);border:2px solid #cbbfff;color:#fff;font:800 13px system-ui;letter-spacing:.06em}
#jumpBtn:active{background:rgba(106,92,255,.9)}

.touch-only{display:none}
@media (pointer:coarse){.touch-only{display:block}.desktop-only{display:none}}
@media (max-width:700px){.overlay.side{justify-content:center;padding-left:16px}}
@media (max-height:480px){.card{padding:14px}.chip{margin-bottom:6px}.sub{font-size:13px;margin-bottom:8px}}