:root{
  --gold:#ffd159;
  --card:rgba(255,255,255,.10);
  --glass-stroke:rgba(255,255,255,.55);
  --muted:rgba(255,255,255,.6);
  --flask-w:64px;
  --flask-h:150px;
  --safe-b:env(safe-area-inset-bottom,0px);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{height:100%}
body{
  margin:0;color:#fff;
  font-family:-apple-system,BlinkMacSystemFont,"SF Rounded","Nunito","Segoe UI",system-ui,sans-serif;
  background:#0d0a21;overflow:hidden;
  touch-action:manipulation;user-select:none;-webkit-user-select:none;
}
/* ---------- background ---------- */
#bg{position:fixed;inset:0;z-index:0;background:linear-gradient(#0d0a21,#2b124d)}
.nebula{position:absolute;border-radius:50%;filter:blur(90px);opacity:.8;animation:drift 9s ease-in-out infinite alternate}
.n1{width:320px;height:320px;background:rgba(128,0,255,.35);left:-80px;top:8%}
.n2{width:280px;height:280px;background:rgba(0,200,190,.28);right:-70px;top:55%}
.n3{width:360px;height:360px;background:rgba(60,60,200,.35);left:20%;bottom:-180px}
@keyframes drift{from{transform:translateY(0)}to{transform:translateY(-40px)}}
#stars{position:absolute;inset:0}
#stars i{position:absolute;background:#fff;border-radius:50%;opacity:.55;animation:tw 2.2s ease-in-out infinite alternate}
@keyframes tw{from{opacity:.55}to{opacity:.15}}
#bubbles{position:absolute;inset:0;overflow:hidden}
#bubbles i{position:absolute;border-radius:50%;border:1px solid rgba(255,255,255,.14);
  background:radial-gradient(circle at 30% 30%,rgba(255,255,255,.18),rgba(120,220,255,.07));
  animation:rise linear infinite}
@keyframes rise{from{transform:translateY(30px);opacity:0}10%{opacity:1}to{transform:translateY(-110vh);opacity:.4}}
.vignette{position:absolute;inset:0;background:radial-gradient(circle,transparent 30%,rgba(0,0,0,.45) 100%)}
/* ---------- layout ---------- */
#app{position:relative;z-index:1;height:100dvh;max-width:560px;margin:0 auto;display:flex;flex-direction:column}
.screen{flex:1;display:flex;flex-direction:column;min-height:0}
.hidden{display:none!important}
.menu-wrap{margin:auto;text-align:center;padding:24px;width:100%}
.logo{font-size:72px;filter:drop-shadow(0 6px 18px rgba(0,0,0,.5))}
.title{font-size:44px;font-weight:900;margin:6px 0 0;letter-spacing:.5px;text-shadow:0 3px 0 rgba(0,0,0,.25)}
.subtitle{color:var(--muted);font-weight:600;margin:2px 0 18px}
.menu-card{background:var(--card);backdrop-filter:blur(8px);border:1px solid rgba(255,255,255,.14);
  border-radius:20px;padding:20px;display:flex;flex-direction:column;gap:12px}
.level-line{font-weight:700}
.btn{border:0;border-radius:14px;padding:12px 16px;font-weight:800;font-size:16px;color:#fff;
  background:rgba(255,255,255,.14);cursor:pointer}
.btn.primary{background:linear-gradient(135deg,#8c59f2,#5b2fd6);box-shadow:0 6px 20px rgba(140,89,242,.45)}
.btn.big{font-size:19px;padding:15px}
.btn.ghost{background:rgba(255,255,255,.10)}
.btn.danger{background:rgba(220,60,70,.85);margin:8px 0}
.menu-row{display:flex;gap:10px}.menu-row .btn{flex:1}
.hint{font-size:13px;color:var(--muted)}
.offline-note{color:var(--muted);font-size:13px;margin-top:14px}
#net-dot{color:#4ade80}
/* ---------- game ---------- */
.game-header{display:flex;align-items:center;gap:10px;padding:calc(8px + env(safe-area-inset-top,0px)) 16px 4px}
.icon-btn{width:40px;height:40px;border-radius:50%;border:0;font-size:26px;line-height:1;color:#fff;
  background:rgba(255,255,255,.14);cursor:pointer}
.header-titles{flex:1;text-align:left}
.header-level{font-size:21px;font-weight:900}
.header-moves{font-size:12px;color:var(--muted)}
.coin-pill{background:var(--card);border-radius:999px;padding:8px 14px;font-weight:800;color:var(--gold)}
.board{flex:1;overflow-y:auto;display:grid;grid-template-columns:repeat(4,1fr);gap:16px 8px;
  padding:30px 14px 10px;align-content:start;justify-items:center}
.board.cols3{grid-template-columns:repeat(3,1fr)}
/* flask */
.tube{background:none;border:0;cursor:pointer;padding:22px 10px 8px;position:relative;transition:transform .25s}
.tube .flask{position:relative;width:var(--flask-w);height:var(--flask-h);transition:transform .25s}
.tube.selected .flask{transform:translateY(-16px) scale(1.04)}
.tube .shadow{position:absolute;left:5%;bottom:-14px;width:90%;height:12px;border-radius:50%;
  background:rgba(0,0,0,.35);filter:blur(3px)}
.tube .glass{position:absolute;inset:0;border-radius:8px 8px 24px 24px;
  background:linear-gradient(135deg,rgba(255,255,255,.28),rgba(255,255,255,.12));
  border:2px solid var(--glass-stroke);box-shadow:0 4px 10px rgba(0,0,0,.3)}
.tube.selected .glass{border-color:var(--gold);box-shadow:0 0 16px rgba(255,209,89,.6)}
.tube .glow{position:absolute;inset:-6px;border-radius:26px;filter:blur(14px);opacity:0;pointer-events:none}
.tube.selected .glow{opacity:1;background:rgba(255,209,89,.35)}
.tube.complete .glow{opacity:.8}
.tube .liquid{position:absolute;left:7px;right:7px;bottom:7px;top:21px;display:flex;flex-direction:column-reverse;
  border-radius:4px 4px 16px 16px}
.layer{position:relative;flex:0 0 25%;height:25%;border-top:1px solid rgba(0,0,0,.25)}
.layer:first-child{border-top:0;border-radius:0 0 15px 15px}
.surface{position:absolute;left:1px;right:1px;height:12px;border-radius:50%;opacity:.95;pointer-events:none}
.shine{position:absolute;left:9px;top:14px;width:10px;height:62%;border-radius:8px;pointer-events:none;
  background:linear-gradient(rgba(255,255,255,.35),transparent);filter:blur(.4px)}
.rim{position:absolute;left:8px;right:8px;top:-9px;height:15px;border-radius:7px;z-index:2;
  background:linear-gradient(rgba(255,255,255,.45),rgba(255,255,255,.18));border:2px solid rgba(255,255,255,.75)}
.rim::after{content:"";position:absolute;left:5px;right:5px;top:2px;height:7px;border-radius:50%;background:rgba(0,0,0,.55)}
.sparkle{position:absolute;top:-30px;left:50%;transform:translateX(-50%);font-size:20px;animation:spk .9s ease-in-out infinite alternate}
@keyframes spk{from{transform:translateX(-50%) scale(1);opacity:.75}to{transform:translateX(-50%) scale(1.25);opacity:1}}
.tube.hinted .glass{border-color:cyan;animation:pulse .7s ease-in-out infinite alternate}
@keyframes pulse{from{box-shadow:0 0 6px cyan}to{box-shadow:0 0 20px cyan}}
.tube.tilt .flask{transform:rotate(-28deg) translateY(-10px)}
.stream{position:absolute;top:-38px;left:50%;width:12px;height:48px;transform:translateX(-50%);
  border-radius:6px;box-shadow:0 0 10px currentColor;z-index:3;
  background:linear-gradient(var(--c-hi,#fff),var(--c,#888),var(--c-dk,#333))}
/* toolbar */
.toolbar{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;padding:10px 16px calc(14px + var(--safe-b))}
.tool{border:0;border-radius:14px;background:var(--card);color:#fff;padding:10px 4px;cursor:pointer;
  display:flex;flex-direction:column;gap:2px;align-items:center;font-weight:700}
.tool:disabled{opacity:.4}
.t-icon{font-size:20px}.t-label{font-size:11px;line-height:1.25;min-height:26px}
/* toast */
.toast{position:absolute;left:50%;bottom:110px;transform:translateX(-50%);background:rgba(20,12,40,.95);
  border:1px solid rgba(255,255,255,.2);padding:10px 16px;border-radius:12px;font-size:14px;font-weight:600;
  max-width:90%;text-align:center;z-index:5}
/* win overlay */
.win-overlay{position:absolute;inset:0;background:rgba(5,3,15,.6);display:flex;align-items:center;justify-content:center;z-index:10;padding:20px}
.win-card{background:linear-gradient(#241547,#160b30);border:1px solid rgba(255,255,255,.2);border-radius:24px;
  padding:26px;width:100%;max-width:340px;text-align:center;display:flex;flex-direction:column;gap:10px;
  box-shadow:0 20px 60px rgba(0,0,0,.6)}
.win-emoji{font-size:52px}
.win-stars{font-size:34px;color:var(--gold);letter-spacing:4px}
.win-detail{color:var(--muted)}.win-reward{color:var(--gold);font-weight:800;font-size:18px}
#confetti{position:absolute;inset:0;overflow:hidden;pointer-events:none}
#confetti i{position:absolute;top:-20px;border-radius:2px;animation:cfall linear infinite}
@keyframes cfall{to{transform:translateY(110vh) rotate(360deg)}}
/* modal */
.modal{position:absolute;inset:0;background:rgba(0,0,0,.6);display:flex;align-items:center;justify-content:center;z-index:20;padding:20px}
.modal-card{background:#1d1238;border:1px solid rgba(255,255,255,.18);border-radius:20px;padding:22px;
  width:100%;max-width:360px;display:flex;flex-direction:column;gap:12px}
.help-list{text-align:left;line-height:1.6;padding-left:20px;margin:0}
.switch-row{display:flex;justify-content:space-between;align-items:center;font-weight:700;background:rgba(255,255,255,.07);
  padding:10px 14px;border-radius:12px}
.switch-row input{width:22px;height:22px}
@media (max-width:360px){:root{--flask-w:56px;--flask-h:132px}}