:root{
  --ink:#07060c;
  --panel:#12101c;
  --panel2:#1a1628;
  --line:rgba(255,255,255,.08);
  --safe:#3ee6c4;
  --safe-dim:#1c6b5c;
  --danger:#ff4d5e;
  --danger-dim:#7a1f28;
  --amber:#ffb648;
  --ghost:#5c5478;
  --text:#f2eefb;
  --sub:#a89bc9;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%;background:var(--ink);color:var(--text);overflow-x:hidden;
  font-family:"Baloo 2","Trebuchet MS",sans-serif;-webkit-tap-highlight-color:transparent;user-select:none}
body{
  background:
    radial-gradient(70% 50% at 50% -6%, #2a1f4a 0%, transparent 60%),
    radial-gradient(60% 40% at 90% 100%, #3a1420 0%, transparent 55%),
    var(--ink);
  min-height:100vh;padding:calc(14px + env(safe-area-inset-top)) 14px calc(90px + env(safe-area-inset-bottom));
}
.grain{position:fixed;inset:0;pointer-events:none;opacity:.035;z-index:0;
  background-image:radial-gradient(#fff 1px, transparent 1px);background-size:3px 3px}

.topbar{display:flex;align-items:center;justify-content:space-between;gap:10px;max-width:640px;margin:0 auto 18px;position:relative;z-index:1}
.brand small{display:block;color:var(--amber);font:800 11px/1 "Baloo 2";letter-spacing:.16em}
.brand h1{margin:2px 0 0;font:800 30px/1 "Baloo 2";letter-spacing:.01em}
.brand h1 span{color:var(--danger);text-shadow:0 0 18px rgba(255,77,94,.55)}
.sound-btn{width:40px;height:40px;border-radius:50%;border:1.5px solid var(--line);background:var(--panel);color:var(--text);font-size:16px;cursor:pointer}
.sound-btn[aria-pressed="false"]{opacity:.4}

.intro{max-width:520px;margin:0 auto;position:relative;z-index:1;
  background:var(--panel);border:1.5px solid var(--line);border-radius:22px;padding:20px 20px 22px;
  box-shadow:0 30px 70px -30px rgba(0,0,0,.7)}
.intro p{margin:0 0 18px;font-size:15px;line-height:1.5;color:var(--sub)}
.intro p b{color:var(--text)}
.levels-label{display:block;font:800 11px "Baloo 2";letter-spacing:.14em;color:var(--ghost);margin-bottom:8px}
.level-picker{display:grid;grid-template-columns:repeat(5,1fr);gap:7px;margin-bottom:20px}
.level-picker button{border:1.5px solid var(--line);background:var(--panel2);color:var(--text);
  border-radius:14px;padding:9px 4px 8px;font:800 17px "Baloo 2";cursor:pointer;display:flex;flex-direction:column;gap:3px;align-items:center}
.level-picker button small{font:700 8.5px "Baloo 2";color:var(--sub);letter-spacing:.02em;text-align:center;line-height:1.15}
.level-picker button.active{border-color:var(--amber);background:linear-gradient(180deg,#3a2a1a,#241a10);box-shadow:0 0 0 3px rgba(255,182,72,.16)}
.level-picker button.active small{color:var(--amber)}
.start-btn{width:100%;border:0;border-radius:16px;padding:16px;font:800 17px "Baloo 2";letter-spacing:.02em;
  background:linear-gradient(180deg,#4dffdc,var(--safe));color:#04231d;cursor:pointer;
  box-shadow:0 16px 34px -12px rgba(62,230,196,.55)}
.start-btn:active{transform:translateY(1px)}

.game{max-width:480px;margin:0 auto;position:relative;z-index:1}
.hud{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:22px}
.turn-pill{display:flex;align-items:center;gap:8px;padding:9px 14px;border-radius:999px;background:var(--panel);border:1.5px solid var(--line);font:800 12.5px "Baloo 2";letter-spacing:.04em}
.turn-pill i{width:8px;height:8px;border-radius:50%;background:var(--safe);box-shadow:0 0 10px var(--safe)}
.turn-pill.ai i{background:var(--danger);box-shadow:0 0 10px var(--danger)}
.quit-btn{width:38px;height:38px;border-radius:50%;border:1.5px solid var(--line);background:var(--panel);color:var(--sub);font-size:15px;cursor:pointer}

.stage{text-align:center;margin-bottom:24px}
.stage small{display:block;font:800 10.5px "Baloo 2";letter-spacing:.16em;color:var(--ghost)}
.stage b{display:block;font:800 76px/1.05 "Baloo 2";color:var(--amber);text-shadow:0 0 34px rgba(255,182,72,.35);margin:6px 0}
.stage b.pop{animation:pop .32s ease}
.stage b.boom{animation:boom .45s ease;color:var(--danger);text-shadow:0 0 34px rgba(255,77,94,.5)}
.stage-hint{font:700 13px "Baloo 2";color:var(--sub)}

.number-form{display:flex;gap:9px;margin-bottom:20px}
.number-form input{flex:1;min-width:0;border:1.5px solid var(--line);background:var(--panel2);color:var(--text);
  border-radius:14px;padding:15px 16px;font:800 20px "Baloo 2";text-align:center;outline:none;
  -moz-appearance:textfield}
.number-form input::-webkit-outer-spin-button,.number-form input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
.number-form input:focus{border-color:var(--safe)}
.number-form input.shake{animation:shake .35s ease;border-color:var(--danger)}
@keyframes shake{20%,60%{transform:translateX(-6px)}40%,80%{transform:translateX(6px)}}
.number-form button{flex:0 0 auto;border:0;border-radius:14px;padding:0 20px;font:800 14px "Baloo 2";letter-spacing:.03em;
  background:linear-gradient(180deg,#4dffdc,var(--safe));color:#04231d;cursor:pointer}
.number-form button:disabled{opacity:.4;cursor:default}
.number-form.locked input,.number-form.locked button{opacity:.35;pointer-events:none}

.history{display:flex;flex-wrap:wrap;gap:6px;justify-content:center}
.chip{padding:6px 11px;border-radius:999px;font:800 12.5px "Baloo 2";border:1.5px solid transparent}
.chip.safe{background:var(--safe-dim);color:#bdf5e9}
.chip.danger{background:var(--danger-dim);color:#ffd7db}

@keyframes pop{0%{transform:scale(1)}45%{transform:scale(1.16)}100%{transform:scale(1)}}
@keyframes boom{0%,100%{transform:scale(1)}30%{transform:scale(1.22) rotate(-3deg)}60%{transform:scale(.92) rotate(2deg)}}

.end-overlay{position:fixed;inset:0;z-index:50;display:flex;align-items:center;justify-content:center;
  background:rgba(4,3,10,.72);backdrop-filter:blur(6px);padding:20px}
.end-overlay[hidden]{display:none}
.end-card{width:min(94vw,380px);text-align:center;background:var(--panel);border:1.5px solid var(--line);
  border-radius:24px;padding:30px 24px 26px;box-shadow:0 40px 90px -30px rgba(0,0,0,.85);animation:pop .3s ease}
.end-badge{font-size:52px;margin-bottom:6px}
.end-card h2{margin:0 0 8px;font:800 26px "Baloo 2"}
.end-card p{margin:0 0 20px;color:var(--sub);font-size:14.5px;line-height:1.4}
#playAgain{width:100%;border:0;border-radius:14px;padding:14px;font:800 15px "Baloo 2";
  background:linear-gradient(180deg,#4dffdc,var(--safe));color:#04231d;cursor:pointer}

@media (max-width:360px){.stage b{font-size:60px}}