:root{
  --purple:#8D61EF; --purple-dark:#7451D6;
  --lavender:#EAE4FD; --lavender-deep:#CFC3F5;
  --peach:#FFB283; --peach-dark:#E89463; --peach-ink:#D9732B;
  --cyan:#31D6E7; --cyan-dark:#1FB4C6; --cyan-ink:#0E9AAC;
  --yellow:#FFE783; --yellow-dark:#E6C95A;
  --red:#FF6B6B; --red-dark:#E05252;
  --ink:#222531; --ink-soft:#5B5F73; --line:#E9E6F6;
  --bg:#F8F9FD;
  --card:#FFFFFF;
}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent;user-select:none;-webkit-user-select:none;}
html,body{height:100%;}
body{
  font-family:'Nunito','Fredoka','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  background:radial-gradient(1000px 700px at 85% -10%, rgba(234,228,253,.9) 0%, transparent 60%),
             radial-gradient(800px 600px at -10% 110%, rgba(49,214,231,.14) 0%, transparent 55%),
             var(--bg);
  display:flex;justify-content:center;align-items:stretch;
  color:var(--ink); overflow:hidden; touch-action:manipulation;
}
#app{
  position:relative; width:100%; max-width:480px;
  height:100vh; height:100dvh;
  display:flex;flex-direction:column; overflow:hidden;
  background:var(--bg);
  box-shadow:0 0 50px rgba(141,97,239,.12);
  isolation:isolate;
}

/* ---------- Top bar: Duolingo progress bar ---------- */
.topbar{
  display:flex;align-items:center;gap:10px;
  padding:calc(env(safe-area-inset-top,0px) + 10px) 14px 10px;
  flex-shrink:0;
}
.lvl-pill{
  font-family:'Fredoka',sans-serif;font-weight:600;font-size:12px;color:var(--ink-soft);
  background:#fff;border:1.5px solid var(--line);
  padding:5px 10px;border-radius:999px;white-space:nowrap;
}
.progress{
  flex:1;height:16px;border-radius:999px;background:var(--lavender);
  position:relative;overflow:hidden;
}
.progress .fill{
  position:absolute;inset:0;width:0%;border-radius:999px;
  background:linear-gradient(180deg,#A786F4,var(--purple));
  transition:width .5s cubic-bezier(.34,1.3,.64,1);
}
.progress .fill::after{
  content:"";position:absolute;top:3px;left:8px;right:8px;height:4px;border-radius:99px;
  background:rgba(255,255,255,.5);
}
.xp-pill{
  font-family:'Fredoka',sans-serif;font-weight:700;font-size:13px;color:var(--ink);
  background:var(--yellow);border:1.5px solid var(--yellow-dark);
  padding:4px 10px;border-radius:999px;white-space:nowrap;
}
.icon-btn{
  width:36px;height:36px;border-radius:50%;border:none;flex-shrink:0;
  background:#fff;border:1.5px solid var(--line);
  font-size:16px;cursor:pointer;display:flex;align-items:center;justify-content:center;
  transition:transform .1s;
}
.icon-btn:active{transform:scale(.88);}
.icon-btn{color:var(--ink);}
#soundBtn .ic{display:block;}
#soundBtn .ic-off{display:none;}
#soundBtn.muted .ic-on{display:none;}
#soundBtn.muted .ic-off{display:block;}

/* ---------- Sovi Logo coach bubble (Gizmo AI companion + Duolingo character) ---------- */
.bubble-row{
  display:flex;align-items:center;gap:8px;
  padding:2px 14px 10px;flex-shrink:0;
  max-height:22dvh;position:relative;z-index:8;
}
.mascot{
  position:relative;width:52px;height:52px;border-radius:14px;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;background:#fff;
  box-shadow:0 4px 0 var(--lavender);overflow:visible;
  animation:mascotBounce 2.6s ease-in-out infinite;
}
.mascot img{width:100%;height:100%;object-fit:cover;display:block;border-radius:14px;pointer-events:none;}
.mascot .mood-badge{
  position:absolute;top:-6px;right:-8px;font-size:18px;line-height:1;
  animation:moodPop .4s cubic-bezier(.34,1.8,.64,1);
  filter:drop-shadow(0 1px 2px rgba(34,37,49,.25));pointer-events:none;
}
@keyframes moodPop{0%{transform:scale(0) rotate(-20deg);}100%{transform:scale(1) rotate(0);}}
@keyframes mascotBounce{
  0%,100%{transform:translateY(0) rotate(-2deg);}
  50%{transform:translateY(-4px) rotate(2deg);}
}
.bubble{
  position:relative;flex:1;min-width:0;background:#fff;color:var(--ink);
  border-radius:18px;padding:10px 14px;font-size:14px;font-weight:700;line-height:1.45;
  box-shadow:0 4px 0 var(--lavender);
  max-height:20dvh;overflow-y:auto;-webkit-overflow-scrolling:touch;
  animation:bubbleIn .45s cubic-bezier(.34,1.56,.64,1);
}
@keyframes bubbleIn{from{opacity:0;transform:translateY(8px) scale(.94);}to{opacity:1;transform:none;}}
.bubble::before{
  content:"";position:absolute;left:-7px;top:18px;
  border:7px solid transparent;border-right-color:#fff;border-left:0;
}
.ask-btn{
  flex-shrink:0;height:42px;min-width:52px;padding:0 12px;border-radius:14px;
  border:none;border-bottom:4px solid var(--cyan-dark);
  background:var(--cyan);color:var(--ink);cursor:pointer;z-index:9;position:relative;
  font-family:'Fredoka','PingFang SC',sans-serif;font-weight:700;font-size:14px;
  display:flex;align-items:center;justify-content:center;white-space:nowrap;
  transition:transform .07s, border-bottom-width .07s;
}
.ask-btn:active{transform:translateY(2px);border-bottom-width:2px;}

/* ---------- Game canvas ---------- */
.stage{
  position:relative;flex:1 1 auto;min-height:0;margin:0 10px;z-index:1;
  border-radius:24px;overflow:hidden;
  background:radial-gradient(600px 400px at 50% 0%, #F6F3FF 0%, transparent 70%), #fff;
  border:2px solid var(--lavender);
  box-shadow:0 6px 18px rgba(141,97,239,.08);
}
.stage.shake{animation:shake .4s;}
@keyframes shake{
  0%,100%{transform:translateX(0);}20%{transform:translateX(-7px);}
  40%{transform:translateX(6px);}60%{transform:translateX(-4px);}80%{transform:translateX(3px);}
}
canvas{display:block;width:100%;height:100%;touch-action:none;}
.formula-pill{
  position:absolute;top:10px;left:10px;max-width:calc(100% - 96px);
  overflow:hidden;text-overflow:ellipsis;
  background:rgba(255,255,255,.88);border:1.5px solid var(--lavender-deep);
  color:var(--purple);font-weight:700;font-size:13px;
  padding:5px 12px;border-radius:999px;white-space:nowrap;pointer-events:none;
  backdrop-filter:blur(4px);
}
.formula-pill .katex{color:inherit;font-size:1em}
.collect-pill{
  position:absolute;top:10px;right:10px;
  background:rgba(255,255,255,.88);border:1.5px solid var(--line);
  color:var(--ink);font-weight:800;font-size:12.5px;font-family:'Fredoka',sans-serif;
  padding:6px 11px;border-radius:999px;pointer-events:none;
}

/* ---------- Bottom console (Duolingo white card + Gizmo minimal) ---------- */
.deck{
  flex:0 1 auto;min-height:0;background:var(--card);
  border-radius:28px 28px 0 0;margin-top:10px;position:relative;z-index:7;
  padding:12px 16px calc(env(safe-area-inset-bottom,0px) + 12px);
  box-shadow:0 -10px 30px rgba(141,97,239,.10);
  border-top:2px solid #F1EEFB;
  display:flex;flex-direction:column;gap:10px;
  max-height:50dvh;
}
.deck-head{
  display:flex;align-items:center;justify-content:space-between;
  font-family:'Fredoka',sans-serif;font-weight:600;font-size:14px;color:var(--ink-soft);
  flex-shrink:0;
}
.deck-title{display:flex;align-items:center;gap:7px;}
.deck-title svg{flex-shrink:0;display:block;}
.reset-btn{
  border:none;background:#F1EEFB;color:var(--ink-soft);font-weight:800;font-size:12px;
  padding:6px 12px;border-radius:99px;cursor:pointer;font-family:inherit;
}
.reset-btn:active{background:var(--lavender);}
.param-scroll{
  display:flex;flex-direction:column;gap:10px;
  overflow-y:auto;flex:1;min-height:0;padding:2px;
  -webkit-overflow-scrolling:touch;
}

.param{
  background:var(--bg);border-radius:20px;padding:10px 12px 12px;
  border:2px solid #F0EDFB;
  animation:paramIn .4s cubic-bezier(.34,1.4,.64,1);
}
@keyframes paramIn{from{opacity:0;transform:translateY(10px);}to{opacity:1;transform:none;}}
.p-top{display:flex;align-items:center;gap:8px;margin-bottom:8px;}
.p-badge{
  width:30px;height:30px;border-radius:10px;background:var(--c);
  color:var(--bc,#fff);font-family:'Fredoka',sans-serif;font-weight:700;font-size:16px;
  display:flex;align-items:center;justify-content:center;font-style:italic;
  box-shadow:0 3px 0 var(--cd);
}
.p-name{font-weight:800;font-size:13.5px;color:var(--ink);flex:1;}
.p-val{
  font-family:'Courier New',monospace;font-weight:700;font-size:16px;color:var(--ct,var(--ink));
  background:#fff;border:2px solid var(--c);border-radius:10px;padding:2px 10px;min-width:64px;text-align:center;
}
.p-row{display:flex;align-items:center;gap:10px;}
.p-step{
  width:42px;height:42px;border-radius:14px;flex-shrink:0;
  background:#fff;border:2px solid var(--line);border-bottom-width:4px;
  color:var(--ct,var(--ink));font-size:22px;font-weight:900;cursor:pointer;line-height:1;
  display:flex;align-items:center;justify-content:center;font-family:'Fredoka',sans-serif;
  transition:transform .07s, border-bottom-width .07s;
}
.p-step:active{transform:translateY(2px);border-bottom-width:2px;}
.slider{
  flex:1;-webkit-appearance:none;appearance:none;height:14px;border-radius:99px;
  background:var(--lavender);outline:none;touch-action:pan-x;
}
.slider::-webkit-slider-thumb{
  -webkit-appearance:none;width:34px;height:34px;border-radius:50%;
  background:#fff;border:4px solid var(--c);
  box-shadow:0 3px 6px rgba(34,37,49,.18);cursor:pointer;
}
.slider::-moz-range-thumb{
  width:26px;height:26px;border-radius:50%;background:#fff;border:4px solid var(--c);
  box-shadow:0 3px 6px rgba(34,37,49,.18);cursor:pointer;
}

.locked-row{display:flex;flex-wrap:wrap;gap:6px;flex-shrink:0;}
.locked-row:empty{display:none;}
.lock-chip{
  font-size:12px;font-weight:800;color:#9B97B0;background:#F1EEFB;
  border-radius:99px;padding:5px 10px;
}

/* ---------- Duolingo 3D primary button ---------- */
.btn-launch{
  width:100%;height:54px;border:none;border-radius:18px;cursor:pointer;flex-shrink:0;
  background:var(--purple);box-shadow:0 5px 0 var(--purple-dark);
  color:#fff;font-family:'Fredoka',sans-serif;font-weight:700;font-size:19px;letter-spacing:2px;
  display:flex;align-items:center;justify-content:center;gap:8px;
  transition:transform .08s, box-shadow .08s, filter .2s;
}
.btn-launch:active{transform:translateY(4px);box-shadow:0 1px 0 var(--purple-dark);}
.btn-launch:disabled{
  background:#EFEDF9;box-shadow:0 5px 0 #DCD7EE;color:#ABA6C6;cursor:default;
  transform:none;
}
#app.flying .param-scroll{opacity:.45;pointer-events:none;transition:opacity .2s;}

/* ---------- Victory card (Duolingo lesson-complete) ---------- */
.win-overlay{
  position:absolute;inset:0;z-index:50;
  background:rgba(234,228,253,.6);backdrop-filter:blur(6px);
  display:flex;align-items:center;justify-content:center;padding:24px;
  opacity:0;pointer-events:none;transition:opacity .25s;
}
.win-overlay.show{opacity:1;pointer-events:auto;}
.win-card{
  width:100%;max-width:340px;background:#fff;border-radius:28px;padding:26px 22px 22px;
  text-align:center;box-shadow:0 20px 60px rgba(141,97,239,.28);
  transform:scale(.7) translateY(30px);transition:transform .35s cubic-bezier(.34,1.56,.64,1);
}
.win-overlay.show .win-card{transform:none;}
.win-emoji{font-size:64px;line-height:1;animation:winPop .8s cubic-bezier(.34,1.8,.64,1) .1s both;}
@keyframes winPop{0%{transform:scale(0) rotate(-30deg);}100%{transform:scale(1) rotate(0);}}
.win-title{
  font-family:'Fredoka',sans-serif;font-weight:700;font-size:26px;color:var(--purple);
  margin:8px 0 6px;
}
.win-hint{font-size:13.5px;font-weight:700;color:var(--ink-soft);line-height:1.55;margin-bottom:14px;}
.win-xp{
  display:inline-block;background:var(--yellow);color:var(--ink);font-family:'Fredoka',sans-serif;
  font-weight:700;font-size:15px;border-radius:99px;padding:7px 18px;margin-bottom:16px;
  box-shadow:0 4px 0 var(--yellow-dark);
  animation:xpGlow 1.2s ease-in-out infinite alternate;
}
@keyframes xpGlow{from{filter:brightness(1);}to{filter:brightness(1.05);}}
.btn-next{
  width:100%;height:54px;border:none;border-radius:16px;cursor:pointer;
  background:var(--purple);box-shadow:0 5px 0 var(--purple-dark);
  color:#fff;font-family:'Fredoka',sans-serif;font-weight:700;font-size:17px;letter-spacing:1px;
  transition:transform .08s, box-shadow .08s;
}
.btn-next:active{transform:translateY(4px);box-shadow:0 1px 0 var(--purple-dark);}