/* Lambda Lab · Chemistry Hub — glass design (translucent, blurred, but always legible) */
:root{
 --bg:#eef2f8;--ink:#0f172a;--ink2:#334155;--ink3:#64748b;--line:rgba(15,23,42,.08);
 --glass:rgba(255,255,255,.58);--glass2:rgba(255,255,255,.74);--glass-brd:rgba(255,255,255,.75);--glass-hi:rgba(255,255,255,.9);
 --shadow:0 18px 50px rgba(30,41,74,.13),0 2px 6px rgba(30,41,74,.06);--shadow-s:0 6px 18px rgba(30,41,74,.1);
 --accent:#2f5bea;--accent2:#7c3aed;--r-l:28px;--r-m:20px;--r-s:14px;
 --blur:blur(26px) saturate(1.8);
 --font:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","Segoe UI Variable","Segoe UI",Inter,Roboto,"Noto Sans Arabic","Helvetica Neue",Arial,sans-serif;
 --mono:"SF Mono",ui-monospace,"Cascadia Code",Consolas,monospace;
}
:root[data-theme="dark"]{
 --bg:#0b1020;--ink:#f1f5f9;--ink2:#cbd5e1;--ink3:#94a3b8;--line:rgba(255,255,255,.08);
 --glass:rgba(22,28,48,.55);--glass2:rgba(28,35,58,.72);--glass-brd:rgba(255,255,255,.12);--glass-hi:rgba(255,255,255,.16);
 --shadow:0 18px 50px rgba(0,0,0,.45),0 2px 6px rgba(0,0,0,.3);--shadow-s:0 6px 18px rgba(0,0,0,.35);--accent:#7aa2ff;--accent2:#b794f6;
}
*{box-sizing:border-box}
html,body{margin:0;min-height:100%}
body{font-family:var(--font);color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased;overflow-x:hidden;transition:background .4s,color .4s}
button,input,select{font:inherit;color:inherit}
button{cursor:pointer}
/* living colour behind the glass */
.ch-aurora{position:fixed;inset:-20vmax;z-index:-1;pointer-events:none;filter:blur(70px) saturate(1.3);opacity:.85}
.ch-aurora i{position:absolute;border-radius:50%;width:48vmax;height:48vmax;animation:drift 28s ease-in-out infinite alternate}
.ch-aurora i:nth-child(1){background:radial-gradient(circle,#8fb3ff 0,transparent 65%);left:5%;top:0}
.ch-aurora i:nth-child(2){background:radial-gradient(circle,#f5a9d8 0,transparent 65%);right:0;top:10%;animation-duration:34s}
.ch-aurora i:nth-child(3){background:radial-gradient(circle,#9ff0d8 0,transparent 65%);left:25%;bottom:-5%;animation-duration:40s}
.ch-aurora i:nth-child(4){background:radial-gradient(circle,#ffd89a 0,transparent 60%);right:18%;bottom:0;animation-duration:31s}
:root[data-theme="dark"] .ch-aurora{opacity:.45}
@keyframes drift{0%{transform:translate(0,0) scale(1)}50%{transform:translate(6vmax,-4vmax) scale(1.12)}100%{transform:translate(-5vmax,5vmax) scale(.95)}}
@media (prefers-reduced-motion:reduce){.ch-aurora i,.tile.liquid::after,.tile.gas::before,.bohr .ring{animation:none!important}}

.glass{background:var(--glass);backdrop-filter:var(--blur);-webkit-backdrop-filter:var(--blur);border:1px solid var(--glass-brd);box-shadow:var(--shadow),inset 0 1px 0 var(--glass-hi)}

/* ---------- top bar ---------- */
.ch-top{position:sticky;top:10px;z-index:30;margin:10px 14px 0;border-radius:var(--r-m);display:flex;align-items:center;gap:14px;padding:8px 12px 8px 14px}
.ch-brand{display:flex;align-items:center;gap:9px;text-decoration:none;color:var(--ink);font-weight:750;letter-spacing:-.01em;font-size:17px;white-space:nowrap}
.ch-brand img{width:26px;height:33px}
.ch-brand small{font-weight:600;color:var(--ink3);font-size:13px}
.ch-title{font-weight:760;font-size:17px;letter-spacing:-.02em;white-space:nowrap;background:linear-gradient(90deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
.ch-nav{margin-inline:auto;display:flex;gap:2px;padding:4px;border-radius:999px;background:rgba(120,130,160,.12);position:relative;overflow-x:auto;scrollbar-width:none}
.ch-nav::-webkit-scrollbar{display:none}
.ch-nav button{border:0;background:transparent;padding:7px 14px;border-radius:999px;font-size:13.5px;font-weight:600;color:var(--ink2);white-space:nowrap;position:relative;z-index:1;transition:color .2s}
.ch-nav button.on{color:var(--ink)}
.ch-nav button[disabled]{opacity:.45;cursor:not-allowed}
.ch-nav button small{font-size:10px;font-weight:600;color:var(--ink3);margin-inline-start:4px}
.ch-nav .pill{position:absolute;z-index:0;top:4px;bottom:4px;border-radius:999px;background:var(--glass2);box-shadow:var(--shadow-s),inset 0 1px 0 var(--glass-hi);transition:left .35s cubic-bezier(.3,1.3,.5,1),width .35s cubic-bezier(.3,1.3,.5,1)}
.ch-actions{display:flex;align-items:center;gap:8px}
.seg{display:flex;padding:3px;border-radius:999px;background:rgba(120,130,160,.12)}
.seg button{border:0;background:transparent;padding:5px 10px;border-radius:999px;font-size:12.5px;font-weight:650;color:var(--ink2)}
.seg button.on{background:var(--glass2);color:var(--ink);box-shadow:var(--shadow-s)}
.icon-btn{width:34px;height:34px;border-radius:50%;border:1px solid var(--glass-brd);background:var(--glass2);display:grid;place-items:center;box-shadow:var(--shadow-s);font-size:15px;transition:transform .2s}
.icon-btn:hover{transform:scale(1.07)}

/* ---------- controls ---------- */
.ch-main{padding:14px;max-width:1500px;margin:0 auto}
.ch-controls{border-radius:var(--r-l);padding:14px 16px;display:grid;grid-template-columns:minmax(210px,1fr) minmax(320px,2.2fr);gap:12px 18px;align-items:start}
.ctl-label{font-size:11px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--ink3);margin:0 0 7px}
:root[lang="ar"] .ctl-label{letter-spacing:0}
.search{display:flex;align-items:center;gap:8px;padding:0 12px;height:40px;border-radius:12px;background:var(--glass2);border:1px solid var(--glass-brd)}
.search input{border:0;outline:0;background:transparent;flex:1;min-width:0;font-size:14.5px}
.search kbd{font-family:var(--mono);font-size:11px;color:var(--ink3);border:1px solid var(--line);border-radius:6px;padding:1px 6px}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chip{border:1px solid var(--glass-brd);background:var(--glass2);padding:6px 11px;border-radius:999px;font-size:12.5px;font-weight:600;color:var(--ink2);display:inline-flex;align-items:center;gap:6px;transition:transform .15s,background .2s,color .2s,box-shadow .2s}
.chip:hover{transform:translateY(-1px)}
.chip.on{background:var(--ink);color:var(--bg);border-color:transparent;box-shadow:var(--shadow-s)}
.chip i{width:9px;height:9px;border-radius:3px;display:inline-block}
.row{display:flex;flex-wrap:wrap;gap:10px 16px;align-items:center}
.temp{grid-column:1/-1;display:grid;grid-template-columns:auto 1fr auto;gap:14px;align-items:center;padding:10px 14px;border-radius:18px;background:linear-gradient(90deg,rgba(80,140,255,.16),rgba(120,220,200,.12),rgba(255,190,90,.16),rgba(255,90,90,.18));border:1px solid var(--glass-brd)}
.temp .t-read{font-variant-numeric:tabular-nums;font-weight:750;font-size:22px;letter-spacing:-.02em;min-width:130px}
.temp .t-read small{display:block;font-size:11.5px;font-weight:600;color:var(--ink3);letter-spacing:0}
input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:28px;background:transparent}
input[type=range]::-webkit-slider-runnable-track{height:8px;border-radius:99px;background:linear-gradient(90deg,#3a6df0,#39c3d6 25%,#8bd66b 45%,#ffc24d 65%,#ff7a45 82%,#ff3d6b)}
input[type=range]::-moz-range-track{height:8px;border-radius:99px;background:linear-gradient(90deg,#3a6df0,#39c3d6 25%,#8bd66b 45%,#ffc24d 65%,#ff7a45 82%,#ff3d6b)}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:24px;height:24px;border-radius:50%;margin-top:-8px;background:#fff;border:1px solid rgba(0,0,0,.08);box-shadow:0 4px 12px rgba(0,0,0,.25)}
input[type=range]::-moz-range-thumb{width:24px;height:24px;border-radius:50%;background:#fff;border:1px solid rgba(0,0,0,.08);box-shadow:0 4px 12px rgba(0,0,0,.25)}
.state-count{display:flex;gap:6px;flex-wrap:wrap}
.state-count span{font-size:12px;font-weight:650;padding:4px 9px;border-radius:999px;background:var(--glass2);border:1px solid var(--glass-brd)}

/* ---------- periodic table ---------- */
.ch-table-wrap{margin-top:14px;position:relative;overflow-x:auto;padding:30px 24px 22px 40px;border-radius:var(--r-l)}
.ptable{display:grid;grid-template-columns:22px repeat(18,minmax(54px,1fr));grid-template-rows:auto repeat(7,auto) 16px repeat(2,auto);gap:5px;min-width:1080px;position:relative}
.tile{position:relative;aspect-ratio:1/1.08;border-radius:12px;border:1px solid rgba(255,255,255,.7);padding:5px 6px 4px;display:flex;flex-direction:column;justify-content:space-between;text-align:start;overflow:hidden;
 background:linear-gradient(145deg,color-mix(in srgb,var(--c) 34%,rgba(255,255,255,.72)),color-mix(in srgb,var(--c) 16%,rgba(255,255,255,.5)));
 backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);box-shadow:0 3px 10px rgba(30,41,74,.08),inset 0 1px 0 rgba(255,255,255,.85);
 transition:transform .22s cubic-bezier(.3,1.4,.5,1),box-shadow .22s,opacity .25s,filter .25s,background .45s;color:#0f172a;font-family:var(--font)}
:root[data-theme="dark"] .tile{border-color:rgba(255,255,255,.12);color:#f8fafc;background:linear-gradient(145deg,color-mix(in srgb,var(--c) 42%,rgba(20,26,44,.8)),color-mix(in srgb,var(--c) 20%,rgba(20,26,44,.7)));box-shadow:0 3px 10px rgba(0,0,0,.3),inset 0 1px 0 rgba(255,255,255,.12)}
.tile:hover,.tile:focus-visible{transform:translateY(-3px) scale(1.12);z-index:5;box-shadow:0 14px 30px color-mix(in srgb,var(--c) 45%,transparent),inset 0 1px 0 rgba(255,255,255,.9);outline:none}
.tile .z{font-size:10.5px;font-weight:650;opacity:.72;font-variant-numeric:tabular-nums;display:flex;justify-content:space-between}
.tile .s{font-size:clamp(17px,1.7vw,24px);font-weight:780;letter-spacing:-.02em;line-height:1;text-align:center}
.tile .n{font-size:9.5px;font-weight:600;opacity:.8;text-align:center;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tile .v{font-size:10px;font-weight:700;text-align:center;font-variant-numeric:tabular-nums;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tile.dim{opacity:.18;filter:saturate(.3)}
.tile.hl{box-shadow:0 0 0 2px color-mix(in srgb,var(--c) 70%,#fff),0 8px 20px rgba(30,41,74,.14)}
.tile.cmp::after{content:"";position:absolute;top:4px;inset-inline-end:4px;width:8px;height:8px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 2px #fff}
.tile.pred{border-style:dashed}
.tile.nodata{background:repeating-linear-gradient(135deg,rgba(148,163,184,.22) 0 6px,rgba(148,163,184,.08) 6px 12px)}
.tile.ghost{background:transparent;border:1.5px dashed rgba(100,116,139,.35);box-shadow:none;backdrop-filter:none;cursor:default;display:grid;place-items:center;text-align:center;font-size:11px;font-weight:650;color:var(--ink3)}
.tile.ghost:hover{transform:none}
/* states at the chosen temperature */
.tile.st-solid{--c:#8ea3c7}
.tile.st-liquid{--c:#2bb5d8}
.tile.st-gas{--c:#f472b6}
.tile.st-unknown{--c:#b8c0cc}
.tile.liquid::after{content:"";position:absolute;left:-20%;right:-20%;bottom:-6px;height:38%;background:radial-gradient(120% 60% at 50% 0,rgba(255,255,255,.55) 0 30%,transparent 31%),rgba(30,160,210,.35);border-radius:45% 45% 0 0;animation:wave 2.6s ease-in-out infinite}
@keyframes wave{0%,100%{transform:translateX(-6%) rotate(-2deg)}50%{transform:translateX(6%) rotate(2deg)}}
.tile.gas::before{content:"";position:absolute;inset:0;background-image:radial-gradient(circle,rgba(255,255,255,.9) 0 1.6px,transparent 2.2px),radial-gradient(circle,rgba(255,255,255,.7) 0 1.2px,transparent 1.8px);background-size:15px 15px,11px 11px;background-position:0 0,5px 7px;animation:float 3.4s linear infinite;opacity:.8}
@keyframes float{from{background-position:0 18px,5px 25px}to{background-position:0 -12px,5px -8px}}
/* the glass panel in the gap */
.preview{grid-column:3/13;grid-row:1/4;align-self:stretch;border-radius:20px;padding:12px 16px;display:grid;grid-template-columns:auto 1fr auto;gap:14px;align-items:center;min-height:0}
.preview .big{width:104px;aspect-ratio:1/1.08;border-radius:18px;display:flex;flex-direction:column;justify-content:space-between;padding:8px 10px;background:linear-gradient(145deg,color-mix(in srgb,var(--c) 45%,#fff),color-mix(in srgb,var(--c) 20%,#fff));box-shadow:0 10px 26px color-mix(in srgb,var(--c) 35%,transparent);color:#0f172a}
.preview .big b{font-size:44px;font-weight:800;text-align:center;letter-spacing:-.03em;line-height:1}
.preview .big span{font-size:12px;font-weight:650}
.preview h3{margin:0;font-size:21px;letter-spacing:-.02em}
.preview p{margin:3px 0 0;font-size:12.5px;color:var(--ink2);line-height:1.45}
.preview .kv{display:grid;grid-template-columns:repeat(3,auto);gap:4px 16px;margin-top:8px;font-size:12px}
.preview .kv span{color:var(--ink3)}.preview .kv b{font-weight:700;font-variant-numeric:tabular-nums}
.preview .hint{grid-column:1/-1;text-align:center;color:var(--ink3);font-size:13px}
.legend{display:flex;flex-wrap:wrap;gap:6px;justify-content:center}
.scale{display:flex;align-items:center;gap:8px;font-size:12px;font-weight:650;color:var(--ink2)}
.scale .bar{flex:1;height:10px;border-radius:99px;min-width:160px}
.group-no,.period-no{font-size:11px;font-weight:700;color:var(--ink3);text-align:center;align-self:end}
.period-no{position:absolute;inset-inline-start:-26px;width:20px;display:grid;place-items:center}
.trend{position:absolute;pointer-events:none;font-size:12px;font-weight:700;color:var(--accent);display:flex;align-items:center;gap:6px;white-space:nowrap}
.trend svg{overflow:visible}
.trend.h{top:4px;left:50%;transform:translateX(-50%)}
.trend.v{left:6px;top:50%;transform:translateY(-50%);flex-direction:column;gap:6px}
.trend.v span{writing-mode:vertical-rl;transform:rotate(180deg)}
.note-pill{font-size:12px;font-weight:650;color:var(--ink2);padding:5px 10px;border-radius:999px;background:var(--glass2);border:1px solid var(--glass-brd)}

/* ---------- compare tray ---------- */
.tray{position:fixed;left:50%;bottom:16px;transform:translate(-50%,140%);z-index:40;border-radius:999px;padding:8px 8px 8px 14px;display:flex;align-items:center;gap:8px;transition:transform .45s cubic-bezier(.3,1.3,.5,1)}
.tray.show{transform:translate(-50%,0)}
.tray .mini{width:38px;height:38px;border-radius:11px;display:grid;place-items:center;font-weight:800;background:linear-gradient(145deg,color-mix(in srgb,var(--c) 40%,#fff),color-mix(in srgb,var(--c) 18%,#fff));color:#0f172a;position:relative}
.tray .mini button{position:absolute;top:-6px;inset-inline-end:-6px;width:18px;height:18px;border-radius:50%;border:0;background:var(--ink);color:var(--bg);font-size:11px;line-height:18px;padding:0}
.btn{border:0;border-radius:999px;padding:10px 16px;font-weight:700;font-size:13.5px;background:var(--ink);color:var(--bg);box-shadow:var(--shadow-s);transition:transform .15s}
.btn:hover{transform:translateY(-1px)}
.btn.soft{background:var(--glass2);color:var(--ink);border:1px solid var(--glass-brd)}
.btn.accent{background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff}

/* ---------- sheets (element card, compare) ---------- */
.backdrop{position:fixed;inset:0;z-index:50;background:rgba(15,23,42,.18);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);display:grid;place-items:center;padding:18px;opacity:0;pointer-events:none;transition:opacity .3s}
.backdrop.show{opacity:1;pointer-events:auto}
.sheet{width:min(1060px,100%);max-height:calc(100vh - 36px);overflow:auto;border-radius:32px;position:relative;transform:translateY(24px) scale(.97);transition:transform .45s cubic-bezier(.3,1.3,.5,1);scrollbar-width:thin}
.backdrop.show .sheet{transform:none}
.hero{position:relative;padding:26px 28px 20px;display:grid;grid-template-columns:auto 1fr auto;gap:22px;align-items:center;border-radius:32px 32px 0 0;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background:radial-gradient(90% 140% at 0 0,color-mix(in srgb,var(--c) 55%,transparent),transparent 60%),radial-gradient(70% 120% at 100% 0,color-mix(in srgb,var(--c) 30%,transparent),transparent 65%);opacity:.9;z-index:-1}
.hero-tile{width:150px;aspect-ratio:1/1.1;border-radius:26px;padding:12px 14px;display:flex;flex-direction:column;justify-content:space-between;color:#0f172a;
 background:linear-gradient(145deg,color-mix(in srgb,var(--c) 30%,rgba(255,255,255,.85)),color-mix(in srgb,var(--c) 14%,rgba(255,255,255,.6)));border:1px solid rgba(255,255,255,.85);
 box-shadow:0 20px 44px color-mix(in srgb,var(--c) 40%,transparent),inset 0 1px 0 #fff;transform:perspective(600px) rotateY(-8deg) rotateX(4deg);transition:transform .5s}
.hero-tile:hover{transform:perspective(600px) rotateY(0) rotateX(0) scale(1.03)}
.hero-tile .top{display:flex;justify-content:space-between;font-weight:700;font-size:14px}
.hero-tile b{font-size:66px;font-weight:820;letter-spacing:-.04em;text-align:center;line-height:1}
.hero-tile .bot{text-align:center;font-size:12.5px;font-weight:650;opacity:.8}
.hero h2{margin:0;font-size:38px;letter-spacing:-.03em;line-height:1.05}
.hero .alt{margin-top:5px;color:var(--ink2);font-size:14px;font-weight:550}
.badges{display:flex;flex-wrap:wrap;gap:6px;margin-top:12px}
.badge{font-size:12px;font-weight:650;padding:5px 10px;border-radius:999px;background:var(--glass2);border:1px solid var(--glass-brd);display:inline-flex;gap:6px;align-items:center}
.badge.warn{background:rgba(250,204,21,.25);border-color:rgba(234,179,8,.45)}
.badge.pred{background:rgba(148,163,184,.2);border-style:dashed}
.hero-actions{display:flex;flex-direction:column;gap:8px;align-self:start}
.hero-actions .navs{display:flex;gap:6px;justify-content:flex-end;margin-inline-end:46px}
.tabs{position:sticky;top:0;z-index:3;display:flex;justify-content:center;padding:10px;background:linear-gradient(var(--glass2),transparent)}
.tabs .seg{max-width:100%;overflow-x:auto;scrollbar-width:none}.tabs .seg button{padding:8px 16px;font-size:13.5px;white-space:nowrap}
.pane{padding:6px 28px 28px;animation:fadeUp .35s ease}
@keyframes fadeUp{from{transform:translateY(8px)}to{transform:none}}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:10px}
.stat{border-radius:18px;padding:12px 14px;background:var(--glass2);border:1px solid var(--glass-brd);box-shadow:inset 0 1px 0 var(--glass-hi)}
.stat>span{display:block;font-size:11.5px;font-weight:650;color:var(--ink3);letter-spacing:.02em}
.stat b{display:block;font-size:20px;font-weight:750;letter-spacing:-.02em;margin-top:4px;font-variant-numeric:tabular-nums}
.stat small{font-size:12px;color:var(--ink3);font-weight:600}
.stat .rank{height:6px;border-radius:99px;background:rgba(120,130,160,.18);margin-top:9px;overflow:hidden}
.stat .rank i{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,var(--accent),var(--accent2));transition:width .6s cubic-bezier(.3,1,.5,1)}
.stat .rk{font-size:11px;color:var(--ink3);margin-top:5px;display:block;font-weight:600}
.fact{border-radius:20px;padding:14px 18px;margin-bottom:12px;background:linear-gradient(135deg,color-mix(in srgb,var(--c) 22%,var(--glass2)),var(--glass2));border:1px solid var(--glass-brd);font-size:15px;line-height:1.5}
.fact b{display:block;font-size:11.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--ink3);margin-bottom:4px}
.sec-title{font-size:13px;font-weight:750;color:var(--ink2);margin:18px 0 8px}
.conf{font-size:22px;font-weight:650;font-family:var(--font);letter-spacing:.01em;line-height:1.7;direction:ltr;unicode-bidi:isolate;word-spacing:.12em}
.conf sup{font-size:.6em;font-weight:700}
.conf .core{padding:1px 8px;border-radius:8px;background:rgba(124,58,237,.14);color:var(--accent2)}
.electrons{display:grid;grid-template-columns:minmax(260px,340px) 1fr;gap:18px;align-items:start}
.bohr{width:100%;aspect-ratio:1;border-radius:24px;background:radial-gradient(circle,color-mix(in srgb,var(--c) 18%,transparent),transparent 70%),var(--glass2);border:1px solid var(--glass-brd)}
.bohr .ring{transform-origin:50% 50%;animation:spin linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.boxes{display:flex;flex-wrap:wrap;gap:12px 14px;direction:ltr}
.sub{display:flex;flex-direction:column;align-items:center;gap:4px}
.sub .bx{display:flex}
.sub .bx span{width:30px;height:36px;border:1.5px solid color-mix(in srgb,var(--ink) 35%,transparent);margin-inline-start:-1.5px;display:grid;place-items:center;font-size:17px;font-weight:800;color:var(--accent);background:var(--glass2);letter-spacing:-3px}
.sub .bx span:first-child{border-radius:8px 0 0 8px;margin-inline-start:0}.sub .bx span:last-child{border-radius:0 8px 8px 0}.sub .bx span:only-child{border-radius:8px}
.sub label{font-size:12px;font-weight:700;color:var(--ink2)}
.sub.val .bx span{border-color:var(--accent2);background:color-mix(in srgb,var(--accent2) 10%,var(--glass2))}
.xnote{margin-top:12px;border-radius:14px;padding:10px 14px;background:rgba(250,204,21,.18);border:1px solid rgba(234,179,8,.35);font-size:13.5px;line-height:1.5}
.tbl{width:100%;border-collapse:separate;border-spacing:0 6px;font-size:14px}
.tbl th{font-size:11.5px;font-weight:700;color:var(--ink3);text-align:start;padding:0 12px}
.tbl td{background:var(--glass2);padding:10px 12px;font-variant-numeric:tabular-nums}
.tbl td:first-child{border-radius:12px 0 0 12px;font-weight:750}.tbl td:last-child{border-radius:0 12px 12px 0}
:root[dir="rtl"] .tbl td:first-child{border-radius:0 12px 12px 0}:root[dir="rtl"] .tbl td:last-child{border-radius:12px 0 0 12px}
.abar{height:8px;border-radius:99px;background:rgba(120,130,160,.18);min-width:90px;overflow:hidden}
.abar i{display:block;height:100%;background:linear-gradient(90deg,#34d399,#10b981)}
.mini3d{border:0;border-radius:999px;padding:6px 11px;font-size:12px;font-weight:700;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff}
.story{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.story .stat p{margin:6px 0 0;font-size:14.5px;line-height:1.55;color:var(--ink)}
.uses{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.uses span{padding:6px 11px;border-radius:999px;background:color-mix(in srgb,var(--c) 18%,var(--glass2));border:1px solid var(--glass-brd);font-size:13px;font-weight:600}
.hazard{border-color:rgba(239,68,68,.35)!important;background:linear-gradient(135deg,rgba(254,226,226,.6),var(--glass2))!important}
:root[data-theme="dark"] .hazard{background:linear-gradient(135deg,rgba(127,29,29,.35),var(--glass2))!important}
.src{margin-top:16px;font-size:12px;color:var(--ink3);line-height:1.5}
.close{position:absolute;top:16px;inset-inline-end:16px;z-index:5}
/* compare */
.cmp-grid{display:grid;gap:10px;padding:0 24px 26px}
.cmp-head{display:grid;gap:10px;padding:24px 24px 10px}
.cmp-card{border-radius:22px;padding:14px;text-align:center;background:linear-gradient(145deg,color-mix(in srgb,var(--c) 30%,var(--glass2)),var(--glass2));border:1px solid var(--glass-brd)}
.cmp-card b{font-size:42px;font-weight:820;display:block;letter-spacing:-.03em}
.cmp-row{display:grid;gap:10px;align-items:center}
.cmp-row>span{font-size:12.5px;font-weight:700;color:var(--ink3)}
.cmp-cell{border-radius:14px;padding:9px 12px;background:var(--glass2);border:1px solid var(--glass-brd);font-weight:700;font-variant-numeric:tabular-nums;font-size:14px}
.cmp-cell .abar{margin-top:6px}
.cmp-cell.best{box-shadow:0 0 0 2px color-mix(in srgb,var(--accent) 60%,transparent)}
/* settings popover */
.pop{position:absolute;top:52px;inset-inline-end:10px;border-radius:20px;padding:14px;width:270px;display:none;flex-direction:column;gap:12px;z-index:60}
.pop.show{display:flex}
.pop .row{justify-content:space-between}
.pop label{font-size:13px;font-weight:650;color:var(--ink2)}
.toast{position:fixed;top:78px;left:50%;transform:translateX(-50%);z-index:70;border-radius:999px;padding:9px 16px;font-size:13.5px;font-weight:650;opacity:0;transition:opacity .3s;pointer-events:none}
.toast.show{opacity:1}
.foot{text-align:center;font-size:12px;color:var(--ink3);padding:18px 14px 90px;line-height:1.6}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
@media (max-width:900px){
 .ch-top{flex-wrap:wrap}.ch-nav{order:3;width:100%;margin:0}
 .ch-controls{grid-template-columns:1fr}.temp{grid-template-columns:1fr}
 .hero{grid-template-columns:1fr;justify-items:start}.hero-actions{flex-direction:row;flex-wrap:wrap}
 .electrons,.story{grid-template-columns:1fr}
 .pane{padding:6px 16px 22px}
}

/* ---------- Phase 2 · Orbital Atlas ---------- */
.orb{display:grid;grid-template-columns:280px minmax(0,1fr) 320px;gap:14px;align-items:start}
.orb-side,.orb-info{border-radius:var(--r-l);padding:14px 16px;max-height:calc(100vh - 110px);overflow:auto;position:sticky;top:84px;scrollbar-width:thin}
.orb-stage{position:relative;height:calc(100vh - 110px);min-height:520px;border-radius:var(--r-l);overflow:hidden;
 background:radial-gradient(120% 90% at 30% 20%,#1b2140 0,#0a0e1f 55%,#05070f 100%);border:1px solid rgba(255,255,255,.12);box-shadow:var(--shadow),inset 0 1px 0 rgba(255,255,255,.08)}
.orb-views{position:absolute;inset:0;display:grid;grid-template-columns:1fr;grid-template-rows:100%}
.orb-views.two{grid-template-columns:1fr 1fr}
.orb-views.two .orb-view+.orb-view{border-inline-start:1px solid rgba(255,255,255,.1)}
.orb-view{position:relative;min-width:0;height:100%;overflow:hidden}
.orb-view canvas{position:absolute;inset:0;width:100%!important;height:100%!important;display:block;touch-action:none}
.orb-vlabel{position:absolute;top:58px;left:50%;transform:translateX(-50%);font-size:30px;font-weight:780;color:#f8fafc;letter-spacing:-.02em;text-shadow:0 4px 18px rgba(0,0,0,.5);pointer-events:none;direction:ltr}
.orb-vlabel sub{font-size:.55em}
.orb-badge{position:absolute;top:14px;inset-inline-start:16px;color:#e2e8f0;font-size:13px;letter-spacing:.06em;text-transform:uppercase;padding:6px 12px;border-radius:999px;background:rgba(255,255,255,.08);backdrop-filter:blur(12px);border:1px solid rgba(255,255,255,.12)}
.orb-legend{position:absolute;bottom:14px;inset-inline-start:16px;display:flex;gap:10px}
.orb-legend span,.orb-legend-in span{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;font-weight:650;color:#e2e8f0;padding:6px 11px;border-radius:999px;background:rgba(255,255,255,.08);backdrop-filter:blur(12px);border:1px solid rgba(255,255,255,.12)}
.orb-legend-in span{color:var(--ink);background:var(--glass2);border-color:var(--glass-brd)}
.orb-legend i,.orb-legend-in i{width:12px;height:12px;border-radius:50%;display:inline-block}
.orb-legend i[style*="gradient"]{width:40px;border-radius:6px}
.orb-legend-in{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
.orb-hint{position:absolute;bottom:16px;inset-inline-end:16px;font-size:12px;color:rgba(226,232,240,.6)}
.orb-busy{position:absolute;top:14px;inset-inline-end:16px;font-size:12.5px;font-weight:650;color:#e2e8f0;padding:6px 12px;border-radius:999px;background:rgba(124,58,237,.35);opacity:0;transition:opacity .2s}
.orb-busy.show{opacity:1}
.orb-quick{display:flex;flex-wrap:wrap;gap:5px}
.orb-quick .chip{padding:5px 9px;font-size:12.5px}
.orb-quick .chip sub,.seg sub{font-size:.72em}
.orb-q{display:grid;grid-template-columns:18px 1fr;gap:8px;align-items:center;margin-bottom:6px}
.orb-q>span{font-weight:800;font-style:italic;color:var(--ink2)}
.orb-q .seg{flex-wrap:wrap;border-radius:14px}
.orb-q .seg button{padding:5px 8px}
.orb-q .seg small{font-size:10.5px;color:var(--ink3)}
.orb-rule{font-size:12px;color:var(--ink3);margin:4px 0 12px;line-height:1.45}
.orb-sel{width:100%;height:38px;border-radius:12px;border:1px solid var(--glass-brd);background:var(--glass2);padding:0 10px;font-size:13.5px}
.orb-side input[type=range]{height:22px}
.orb-side input[type=range]::-webkit-slider-runnable-track{background:linear-gradient(90deg,#7c3aed,#4cc9f0)}
.orb-side input[type=range]::-moz-range-track{background:linear-gradient(90deg,#7c3aed,#4cc9f0)}
.orb-name{margin:0;font-size:40px;letter-spacing:-.03em;background:linear-gradient(90deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
.orb-name sub{font-size:.5em}
.orb-sent{font-size:14px;line-height:1.55;color:var(--ink2);margin:6px 0 12px}
.orb-info .stat b{font-size:18px}
.orb-graph{width:100%;height:auto;border-radius:16px;background:var(--glass2);border:1px solid var(--glass-brd)}
.orb-fill{border-radius:16px;padding:10px 12px;background:var(--glass2);border:1px solid var(--glass-brd);margin-top:8px}
.orb-fill .sub{cursor:pointer}
.orb-fill .sub .bx span{width:22px;height:28px;font-size:14px}
.orb-fill .btn{padding:8px 12px}
.orb-prog{height:6px;border-radius:99px;background:rgba(120,130,160,.2);overflow:hidden}
.orb-prog i{display:block;height:100%;background:linear-gradient(90deg,var(--accent),var(--accent2));transition:width .3s}
@media (max-width:1100px){.orb{grid-template-columns:1fr}.orb-side,.orb-info{position:static;max-height:none}.orb-stage{height:62vh;order:-1}}

/* ---------- Phase 3 · Ions ---------- */
.ions-top{border-radius:var(--r-l);padding:8px;display:flex;justify-content:center;margin-bottom:14px}
.ions-top .seg button{padding:8px 18px;font-size:14px}
.ions-limits{max-width:1100px;margin:14px auto 0;text-align:center}
.ionf{font-weight:780;letter-spacing:-.01em;white-space:nowrap}
.ionf sub{font-size:.62em}.ionf sup{font-size:.62em;margin-inline-start:1px}
.ions-lib{display:grid;grid-template-columns:minmax(0,1fr) 440px;gap:14px;align-items:start}
.ions-filters{border-radius:var(--r-l);padding:12px;display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:12px}
.ions-filters .search{flex:1 1 200px;height:36px}
.ion-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(118px,1fr));gap:8px}
.ion-tile{position:relative;border:1px solid var(--glass-brd);border-radius:16px;padding:12px 8px 10px;display:flex;flex-direction:column;align-items:center;gap:4px;
 backdrop-filter:blur(10px);box-shadow:0 3px 10px rgba(30,41,74,.08),inset 0 1px 0 var(--glass-hi);transition:transform .2s cubic-bezier(.3,1.4,.5,1),box-shadow .2s;color:var(--ink)}
.ion-tile.pos{background:linear-gradient(145deg,rgba(255,170,120,.35),rgba(255,255,255,.55))}
.ion-tile.neg{background:linear-gradient(145deg,rgba(110,170,255,.35),rgba(255,255,255,.55))}
:root[data-theme="dark"] .ion-tile.pos{background:linear-gradient(145deg,rgba(255,140,80,.28),rgba(30,36,60,.7))}
:root[data-theme="dark"] .ion-tile.neg{background:linear-gradient(145deg,rgba(90,150,255,.28),rgba(30,36,60,.7))}
.ion-tile:hover{transform:translateY(-3px) scale(1.04)}
.ion-tile.on{box-shadow:0 0 0 2.5px var(--accent),0 10px 24px rgba(47,91,234,.25)}
.ion-tile b{font-size:21px}
.ion-tile>span{font-size:11px;font-weight:600;color:var(--ink2);text-align:center;line-height:1.25}
.ion-tile .dot{position:absolute;top:8px;inset-inline-end:8px;width:10px;height:10px;border-radius:50%;background:var(--ic);box-shadow:0 0 0 2px rgba(255,255,255,.8)}
.ion-card{border-radius:var(--r-l);padding:16px;position:sticky;top:84px;max-height:calc(100vh - 100px);overflow:auto;scrollbar-width:thin}
.ion-hero{display:grid;grid-template-columns:auto 1fr;gap:14px;align-items:center;margin-bottom:12px}
.ion-big{min-width:108px;height:96px;padding:0 14px;border-radius:22px;display:grid;place-items:center;font-size:34px;border:1px solid rgba(255,255,255,.8);box-shadow:0 12px 28px rgba(30,41,74,.14),inset 0 1px 0 #fff}
.ion-hero.pos .ion-big{background:linear-gradient(145deg,#ffd7bd,#fff3ea)}.ion-hero.neg .ion-big{background:linear-gradient(145deg,#cfe0ff,#f0f6ff)}
.ion-big .ionf{color:#0f172a}
.ion-hero h3{margin:0;font-size:22px;letter-spacing:-.02em}
.ion-hero .alt{font-size:12.5px;color:var(--ink3);margin-top:2px}
.ion-hero .badges{margin-top:8px}
.ion-form{border-radius:18px;background:var(--glass2);border:1px solid var(--glass-brd);overflow:hidden}
.ion-form canvas{width:100%;display:block}
.ion-eq{text-align:center;font-size:20px;font-weight:700;margin:8px 0 4px}
.ion-eq sup{font-size:.62em}
.ion-note{font-size:13px;line-height:1.5;color:var(--ink2);margin:6px 0 0}
.ion-3d{position:relative;height:260px;border-radius:18px;overflow:hidden;background:radial-gradient(120% 100% at 30% 20%,#1b2140,#070a16);border:1px solid rgba(255,255,255,.1)}
.ion-3d canvas{width:100%!important;height:100%!important;display:block}
.ion-3d .hint{position:absolute;bottom:8px;inset-inline-end:10px;font-size:11.5px;color:rgba(226,232,240,.6);pointer-events:none}
.ion-size{border-radius:18px;background:var(--glass2);border:1px solid var(--glass-brd);padding:6px;color:var(--ink)}
.beaker-row{display:flex;align-items:center;gap:10px;margin-top:6px;color:var(--ink)}
.beaker-row small{font-size:12.5px;line-height:1.45;color:var(--ink2)}
.flame{filter:drop-shadow(0 0 8px currentColor);animation:flick 1.3s ease-in-out infinite alternate;transform-origin:50% 90%}
@keyframes flick{from{transform:scaleY(1) skewX(-2deg)}to{transform:scaleY(1.08) skewX(2deg)}}
/* builder */
.ions-build{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:14px;align-items:start}
.bpanel{border-radius:var(--r-l);padding:16px}
.bpick{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.chips.quick{margin-top:8px}.chips.quick .chip{padding:5px 9px;font-size:13px}
.bench{margin-top:8px;display:grid;grid-template-columns:1fr 1fr;gap:10px;border-radius:20px;padding:12px;background:var(--glass2);border:1px dashed var(--glass-brd);transition:gap .5s,box-shadow .4s,background .4s}
.bench.locked{gap:2px;box-shadow:0 0 0 2px #22c55e,0 12px 30px rgba(34,197,94,.25);background:linear-gradient(135deg,rgba(220,252,231,.7),var(--glass2));border-style:solid}
:root[data-theme="dark"] .bench.locked{background:linear-gradient(135deg,rgba(22,101,52,.4),var(--glass2))}
.bench .side{display:flex;flex-direction:column;gap:8px;align-items:center}
.bench .cnt{display:flex;align-items:center;gap:10px}.bench .cnt b{font-size:18px;min-width:42px;text-align:center}
.bench .tiles{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;min-height:64px}
.bion{padding:10px 12px;border-radius:14px;font-size:19px;border:1px solid rgba(255,255,255,.8);box-shadow:0 6px 14px rgba(30,41,74,.12);animation:pop .35s cubic-bezier(.3,1.5,.5,1) both;color:#0f172a}
.bion.pos{background:linear-gradient(145deg,#ffd7bd,#fff3ea)}.bion.neg{background:linear-gradient(145deg,#cfe0ff,#f0f6ff)}
.bench.locked .bion{animation:pop .35s both,snap .5s .1s both}
@keyframes pop{from{transform:scale(.4);opacity:0}to{transform:none;opacity:1}}
@keyframes snap{50%{transform:scale(1.12)}}
.meter{margin-top:12px}
.mrow{display:grid;grid-template-columns:90px 1fr 48px;gap:10px;align-items:center;margin-bottom:6px;font-size:13px;font-weight:650;color:var(--ink2)}
.mbar{height:12px;border-radius:99px;background:rgba(120,130,160,.18);overflow:hidden}
.mbar i{display:block;height:100%;border-radius:99px;transition:width .45s cubic-bezier(.3,1.2,.5,1)}
.mbar i.p{background:linear-gradient(90deg,#fb923c,#f43f5e)}.mbar i.n{background:linear-gradient(90deg,#38bdf8,#6366f1)}
.mtotal{margin-top:6px;font-size:14px;padding:9px 12px;border-radius:12px;background:rgba(250,204,21,.18);border:1px solid rgba(234,179,8,.3)}
.mtotal.ok{background:rgba(34,197,94,.16);border-color:rgba(34,197,94,.4)}
.cc{margin:6px 0 0;padding-inline-start:20px;display:grid;gap:10px}
.cc li>span{font-size:13px;color:var(--ink2);font-weight:600}
.ccrow{font-size:22px;font-weight:750;margin-top:4px}.ccrow sub{font-size:.62em}.ccrow sup{font-size:.62em}
.ccrow .hl{color:var(--accent2);animation:pop .5s .9s both}
.ccrow.final{font-size:30px;color:var(--accent)}
.ccx{position:relative;display:flex;gap:70px;font-size:24px;font-weight:750;margin-top:6px;height:66px;align-items:flex-end;padding-inline-start:10px}
.ccx .ccf{position:relative}.ccx em{position:absolute;top:-22px;right:-16px;font-style:normal;font-size:15px;color:var(--accent2);font-weight:800}
.ccx em.u1{animation:cross1 2.4s ease-in-out infinite}.ccx em.u2{animation:cross2 2.4s ease-in-out infinite}
@keyframes cross1{0%,20%{transform:none}60%,100%{transform:translate(78px,42px)}}
@keyframes cross2{0%,20%{transform:none}60%,100%{transform:translate(-86px,42px)}}
.ccx .ccarrows{position:absolute;left:0;top:0;width:170px;height:62px;fill:none;stroke:var(--accent2);stroke-width:1.5;stroke-dasharray:4 4;opacity:.5}
.ccx .ccres{display:none}
.result{margin-top:14px;border-radius:18px;padding:12px;background:linear-gradient(135deg,rgba(47,91,234,.1),rgba(124,58,237,.1));border:1px solid var(--glass-brd);opacity:.35;filter:grayscale(1);transition:opacity .4s,filter .4s}
.result.show{opacity:1;filter:none}
.rf{font-size:40px;font-weight:800;letter-spacing:-.02em;margin-bottom:8px}.rf sub{font-size:.6em}
.fb{min-height:22px;font-size:14px;margin:8px 0 0;line-height:1.5}.fb.ok{color:#15803d}.fb.bad{color:#b91c1c}
:root[data-theme="dark"] .fb.ok{color:#4ade80}:root[data-theme="dark"] .fb.bad{color:#f87171}
.fb sub{font-size:.7em}
/* practice */
.prac{max-width:760px;margin:0 auto}
.pq{font-size:14px;color:var(--ink2);margin:0 0 6px}
.pbig{font-size:34px;font-weight:800;letter-spacing:-.02em;margin-bottom:14px}.pbig sub{font-size:.6em}
.popts{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.popts .btn{border-radius:14px;padding:12px}.popts .good{background:#22c55e;color:#fff}.popts .badb{background:#ef4444;color:#fff}
.pscore{font-size:30px;font-weight:800;margin:12px 0}
.preview-list{padding-inline-start:20px;display:grid;gap:4px;font-size:14px}.preview-list li.ok::marker{color:#22c55e}.preview-list li.bad{color:#b91c1c}
/* solubility table */
.soltab{overflow:auto;max-height:calc(100vh - 230px);border-radius:14px}
.soltab table{border-collapse:separate;border-spacing:2px;font-size:12px}
.soltab th{position:sticky;background:var(--glass2);backdrop-filter:blur(10px);z-index:2;padding:4px 6px;font-size:13px;white-space:nowrap}
.soltab thead th{top:0;height:84px;vertical-align:bottom}.soltab thead th span{display:inline-block;writing-mode:vertical-rl;transform:rotate(180deg)}
.soltab tbody th{left:0;text-align:start}
.soltab td{width:26px;height:26px;border-radius:6px;cursor:pointer;position:relative;transition:transform .15s}
.soltab td:hover{transform:scale(1.35);z-index:3;box-shadow:0 4px 12px rgba(0,0,0,.25)}
.soltab td i{position:absolute;inset:6px;border-radius:50%;border:1px solid rgba(0,0,0,.2)}.soltab td i.sol{inset:auto 4px 4px auto;width:7px;height:7px}
.soltab td.s,.sw.s{background:rgba(34,197,94,.3)}.soltab td.ss,.sw.ss{background:rgba(250,204,21,.45)}.soltab td.i,.sw.i{background:rgba(148,163,184,.45)}
.soltab td.r,.sw.r{background:repeating-linear-gradient(135deg,rgba(239,68,68,.3) 0 4px,rgba(239,68,68,.1) 4px 8px)}.soltab td.x,.sw.x{background:rgba(148,163,184,.1)}
.sw{width:14px!important;height:14px!important;border-radius:4px!important}
@media (max-width:1100px){.ions-lib,.ions-build{grid-template-columns:1fr}.ion-card{position:static;max-height:none}}
@media (max-width:640px){.bpick{grid-template-columns:1fr}.popts{grid-template-columns:1fr}}

.ccx2{display:inline-flex;flex-direction:column;align-items:center;margin-top:6px}
.ccx2 .r{display:grid;grid-template-columns:110px 110px;justify-items:center;font-size:24px;font-weight:750}
.ccx2 .r sub{font-size:.62em}.ccx2 em{font-style:normal;font-size:.62em;vertical-align:super;color:var(--accent2);font-weight:800;padding:0 2px;border-radius:6px;background:rgba(124,58,237,.12)}
.ccx2 svg{fill:none;stroke:var(--accent2);stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.ccx2 svg .a1,.ccx2 svg .a2{stroke-dasharray:90;stroke-dashoffset:90;animation:draw 1.2s .3s ease forwards}
.ccx2 svg .a2{animation-delay:.6s}
@keyframes draw{to{stroke-dashoffset:0}}
.ccx2 .hl{color:var(--accent2);animation:pop .5s 1.4s both}

/* ---------- Phase 4 · Tools ---------- */
.tpanel{border-radius:var(--r-l);padding:16px}
.tcol{display:grid;gap:14px;align-content:start}
.tools-mass,.tools-bal{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);gap:14px;align-items:start}
.stage3d{position:relative;height:430px;border-radius:var(--r-l);overflow:hidden;background:radial-gradient(120% 90% at 50% 10%,rgba(255,255,255,.85),rgba(226,232,240,.55));transition:box-shadow .4s}
:root[data-theme="dark"] .stage3d{background:radial-gradient(120% 90% at 50% 10%,#1e2440,#0b0f1e)}
.stage3d canvas{width:100%!important;height:100%!important;display:block}
.stage3d.ok{box-shadow:0 0 0 3px #22c55e,0 16px 40px rgba(34,197,94,.3)}
.lcd-note{position:absolute;top:10px;inset-inline-start:12px;font-size:12px;font-weight:650;color:var(--ink2)}
.orb-sel.big{height:46px;font-size:18px;font-weight:700;font-family:var(--mono);flex:1;min-width:0}
.fpreview{font-size:26px;font-weight:780;min-height:34px;margin-top:6px}.fpreview sub{font-size:.62em}
.chips .chip sub{font-size:.72em}
.tbl.mt td,.tbl.mt th{padding:7px 9px;font-size:13px}.tbl.mt tr.tot td{background:linear-gradient(90deg,rgba(47,91,234,.14),rgba(124,58,237,.14))}
.tbl.mt tr.dimrow td{opacity:.35}
.ball{display:inline-block;width:12px;height:12px;border-radius:50%;margin-inline-end:6px;vertical-align:-1px;box-shadow:inset -2px -2px 3px rgba(0,0,0,.2),0 0 0 1px rgba(0,0,0,.1)}
.tpanel.two{display:grid;grid-template-columns:auto 1fr;gap:18px}
.donut{display:flex;gap:10px;align-items:center}.donut ul{list-style:none;margin:0;padding:0;font-size:13px;display:grid;gap:4px}
.conv{display:grid;gap:8px}.conv label{display:grid;gap:3px;font-size:12px;font-weight:650;color:var(--ink2)}
.conv input{height:36px;border-radius:10px;border:1px solid var(--glass-brd);background:var(--glass2);padding:0 10px;font-family:var(--mono);font-size:14px}
.work{margin-top:8px;font-size:13px;line-height:1.7;color:var(--ink2);font-family:var(--mono)}
.pred{margin-top:10px;padding:10px 12px;border-radius:14px;background:rgba(124,58,237,.1);border:1px solid rgba(124,58,237,.25);font-size:13.5px}
.eqline{display:flex;flex-wrap:wrap;align-items:center;gap:6px 8px;margin-top:14px;padding:14px;border-radius:18px;background:var(--glass2);border:1px solid var(--glass-brd)}
.eqline .sp{display:inline-flex;align-items:center;gap:4px;padding:4px 8px 4px 4px;border-radius:14px}
.eqline .sp.l{background:rgba(59,130,246,.1)}.eqline .sp.r{background:rgba(249,115,22,.1)}
.eqline .cf{display:inline-flex;flex-direction:column;align-items:center}.eqline .cf button{border:0;background:transparent;font-size:12px;line-height:1;padding:2px 6px;color:var(--accent);border-radius:6px}
.eqline .cf button:hover{background:rgba(47,91,234,.12)}.eqline .cf b{font-size:22px;min-width:22px;text-align:center}.eqline .cf b i{opacity:.3;font-style:normal}
.eqline .fm{font-size:22px;font-weight:750}.eqline .fm sub{font-size:.62em}.eqline .plus{font-size:20px;color:var(--ink3)}.eqline .arrow{font-size:26px;color:var(--accent2);margin:0 6px}
.rxmeta{margin:8px 0 0}
.tally{display:flex;flex-wrap:wrap;gap:6px}.tc{display:flex;align-items:center;gap:6px;padding:6px 10px;border-radius:12px;font-size:14px;border:1px solid var(--glass-brd);transition:background .3s}
.tc.ok{background:rgba(34,197,94,.18)}.tc.no{background:rgba(239,68,68,.14)}.tc span{font-family:var(--mono);font-weight:700}
.bsteps{margin:4px 0 0;padding-inline-start:20px;display:grid;gap:6px;font-size:14px}.bsteps li{transition:color .3s}.bsteps li.now{color:var(--accent);font-weight:700}.bsteps sub{font-size:.7em}
.massrow{display:flex;justify-content:space-between;align-items:center;font-size:15px;gap:10px}.massrow>span:nth-child(2){font-size:22px;font-weight:800;color:var(--accent2)}
.why{margin-top:12px;padding:12px 14px;border-radius:16px;background:var(--glass2);border:1px solid var(--glass-brd)}.why p{margin:4px 0 8px;line-height:1.55;font-size:14px}
.act{display:flex;flex-wrap:wrap;gap:4px;align-items:center;font-weight:700;font-size:14px}.act i{font-style:normal;color:var(--ink3)}.act span{padding:3px 7px;border-radius:8px;background:var(--glass2)}.act span.hit{background:var(--accent);color:#fff}
.popts .btn sub{font-size:.7em}
.rulelist{list-style:none;margin:10px 0 14px;padding:0;display:grid;gap:8px}.rulelist li{display:grid;gap:4px;padding:12px 14px;border-radius:16px;background:var(--glass2);border:1px solid var(--glass-brd)}
.rulelist li.yes{border-inline-start:4px solid #22c55e}.rulelist li.no{border-inline-start:4px solid #ef4444}.rulelist small{color:var(--ink2);font-size:13px}.rulelist small sub{font-size:.7em}
.rulelist.small li{padding:8px 10px;font-size:13px}
.rtag{font-size:11px;font-weight:800;letter-spacing:.04em;text-transform:uppercase;color:var(--ink3)}
.rulescard{max-width:900px;margin:0 auto}.rulescard h3{margin:0;font-size:22px}
.tools-lab{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);gap:14px;align-items:start}
.labstage{position:relative;border-radius:var(--r-l);overflow:hidden;padding:8px}.labstage canvas{width:100%;display:block}
.labstatus{position:absolute;left:16px;right:16px;bottom:14px;padding:10px 14px;border-radius:14px;background:var(--glass2);backdrop-filter:blur(10px);border:1px solid var(--glass-brd);font-size:14px;font-weight:600;line-height:1.45}
.heat{display:grid;grid-template-columns:auto 1fr auto;gap:10px;align-items:center;font-size:12.5px;font-weight:650;color:var(--ink2)}
.heat input[type=range]::-webkit-slider-runnable-track{background:linear-gradient(90deg,#60a5fa,#e2e8f0 50%,#f97316)}.heat input[type=range]::-moz-range-track{background:linear-gradient(90deg,#60a5fa,#e2e8f0 50%,#f97316)}
.treading{display:flex;gap:14px;align-items:baseline;margin-top:6px}.treading b{font-size:30px;letter-spacing:-.02em}.treading span{font-size:14px;color:var(--ink2);font-weight:650}
.chip.metal b{font-size:14px}
@media (max-width:1100px){.tools-mass,.tools-bal,.tools-lab{grid-template-columns:1fr}.tpanel.two{grid-template-columns:1fr}}

/* ---------- Phase 5 · Worksheets & practice ---------- */
.wmake{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.2fr);gap:14px;align-items:start}
.wrow{display:flex;flex-wrap:wrap;gap:14px 22px;margin-top:12px}
.wfields{display:grid;grid-template-columns:2fr 1fr 1fr;gap:8px;margin-top:12px}.wfields label{display:grid;gap:3px;font-size:12px;font-weight:650;color:var(--ink2)}
.wfields input{height:36px;border-radius:10px;border:1px solid var(--glass-brd);background:var(--glass2);padding:0 10px;font-size:14px}
label.chip{cursor:pointer}
.codebox{margin-top:14px;padding:12px;border-radius:16px;background:linear-gradient(135deg,rgba(47,91,234,.1),rgba(124,58,237,.1));border:1px solid var(--glass-brd);display:grid;gap:8px}
.codebox b{font-family:var(--mono);font-size:24px;letter-spacing:.08em}.codebox small{display:block;font-size:12px;color:var(--ink2)}
.paperwrap{border-radius:var(--r-l);padding:14px;position:sticky;top:84px}
.paper-scroll{max-height:calc(100vh - 170px);overflow:auto;border-radius:12px;background:rgba(100,116,139,.18);padding:14px}
.paper-scroll .ws-page{background:#fff;color:#111827;box-shadow:0 8px 24px rgba(0,0,0,.18);margin:0 auto 14px;max-width:760px}
/* the sheet itself (screen preview + print) */
.ws-page{padding:28px 34px;font-family:var(--font);font-size:13.5px;line-height:1.5}
.ws-head{display:flex;justify-content:space-between;gap:16px;border-bottom:2px solid #111827;padding-bottom:10px;margin-bottom:14px}
.ws-head h1{margin:0;font-size:22px;letter-spacing:-.01em}.ws-head p{margin:3px 0 0;color:#475569;font-size:12px}
.ws-meta{display:grid;gap:3px;font-size:12px;text-align:end;white-space:nowrap}.ws-meta b{font-size:15px}
.ws-list{margin:0;padding-inline-start:26px;display:grid;gap:14px}.ws-list>li{break-inside:avoid}
.ws-q{display:list-item}.ws-q .tag{float:inline-end;opacity:.45;font-size:12px}
.ws-q sub,.ws-list sub{font-size:.72em}.ws-q sup,.ws-list sup{font-size:.72em}
.qeq{font-size:17px;font-weight:700;margin:6px 0 2px}.qeq .blank{display:inline-block;width:26px;height:22px;border:1.5px solid #94a3b8;border-radius:5px;margin-inline-end:4px;vertical-align:-5px}
.given{display:block;color:#64748b;font-size:11.5px;margin-top:2px}
.ws-lines i{display:block;height:24px;border-bottom:1px dashed #94a3b8}
.ws-opts{margin:6px 0 0;display:grid;grid-template-columns:1fr 1fr;gap:3px 20px;padding-inline-start:22px}
.ws-key .ws-list{gap:9px}.ws-work{color:#475569;font-size:12.5px;margin-top:3px;line-height:1.55}
:root[data-theme="dark"] .tpanel .ws-work{color:var(--ink2)}
#printRoot{display:none}
@media print{
 @page{size:A4;margin:12mm}
 body>*:not(#printRoot){display:none!important}body{background:#fff!important}
 #printRoot{display:block!important}#printRoot .ws-page{padding:0;box-shadow:none}#printRoot .ws-key{break-before:page}
}
/* practice */
.wprac{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.6fr);gap:14px;align-items:start}
.revpill{margin:14px 0 6px;padding:10px 12px;border-radius:14px;background:rgba(250,204,21,.2);border:1px solid rgba(234,179,8,.35);font-weight:650;font-size:14px}.revpill.ok{background:rgba(34,197,94,.14);border-color:rgba(34,197,94,.35)}
.pq-card{min-height:320px}.pq-prompt{font-size:18px;line-height:1.55;margin:14px 0}.pq-prompt .qeq{font-size:22px}.pq-prompt .given{font-size:13px;color:var(--ink3)}
.pq-prompt sub{font-size:.7em}.pq-prompt .qeq .blank{display:none}
.coefin{display:flex;flex-wrap:wrap;gap:6px 8px;align-items:center;font-size:20px;font-weight:700;padding:12px;border-radius:16px;background:var(--glass2);border:1px solid var(--glass-brd)}
.coefin input{width:54px;height:40px;border-radius:10px;border:1.5px solid var(--glass-brd);background:#fff;text-align:center;font-size:18px;font-weight:700;color:#0f172a}
.coefin .arrow{color:var(--accent2);font-size:24px;margin:0 4px}.coefin sub{font-size:.62em}
.unit{font-weight:700;color:var(--ink2);font-size:16px}
.popts .sel{box-shadow:0 0 0 2px var(--accent)}
/* progress */
.wprog{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);gap:14px;align-items:start}
.accbars{display:grid;gap:8px}.accrow{display:grid;grid-template-columns:minmax(150px,1.2fr) 2fr 48px 50px;gap:10px;align-items:center;font-size:13.5px;font-weight:600}
.accrow small{color:var(--ink3)}
.nextup{margin-top:16px;display:flex;align-items:center;gap:12px;flex-wrap:wrap;font-weight:650;color:var(--ink2)}
@media (max-width:1100px){.wmake,.wprac,.wprog{grid-template-columns:1fr}.paperwrap{position:static}.wfields{grid-template-columns:1fr}}

/* ---------- Phase 6 · Molecule builder ---------- */
.mols{display:grid;grid-template-columns:270px minmax(0,1fr) 340px;gap:14px;align-items:start}
.mside,.minfo{position:sticky;top:84px;max-height:calc(100vh - 100px);overflow:auto;scrollbar-width:thin}
.mstage{position:relative;height:calc(100vh - 110px);min-height:520px;border-radius:var(--r-l);overflow:hidden;background:radial-gradient(120% 90% at 50% 20%,rgba(255,255,255,.9),rgba(219,228,242,.6))}
:root[data-theme="dark"] .mstage{background:radial-gradient(120% 90% at 50% 20%,#1e2440,#0b0f1e)}
.mstage canvas{width:100%!important;height:100%!important;display:block;touch-action:none;cursor:crosshair}
.mlabels{position:absolute;inset:0;pointer-events:none;overflow:hidden}
.mlabels span{position:absolute;left:0;top:0;margin:-11px 0 0 -8px;font-weight:800;font-size:15px;color:#fff;text-shadow:0 1px 3px rgba(0,0,0,.7);white-space:nowrap}
.mlabels span.h{color:#334155;text-shadow:0 0 3px #fff;font-size:12px;margin:-9px 0 0 -4px}
.mlabels .need{font-style:normal;margin-inline-start:4px;padding:1px 5px;border-radius:8px;background:#ef4444;color:#fff;font-size:11px;text-shadow:none}
.mlabels .dl{font-style:normal;margin-inline-start:4px;font-size:12px;text-shadow:none;padding:0 4px;border-radius:6px}.mlabels .dl.p{background:#fecdd3;color:#9f1239}.mlabels .dl.n{background:#bfdbfe;color:#1e3a8a}
.mlabels .ma{font-size:11.5px;font-weight:700;color:#7c3aed;text-shadow:0 0 4px #fff;margin:-8px 0 0 -14px}
:root[data-theme="dark"] .mlabels .ma{color:#c4b5fd;text-shadow:0 0 4px #000}
.mhint{position:absolute;top:12px;left:50%;transform:translateX(-50%);max-width:80%;text-align:center;font-size:13px;font-weight:650;padding:7px 14px;border-radius:999px;background:var(--glass2);backdrop-filter:blur(10px);border:1px solid var(--glass-brd);transition:background .3s}
.mhint.warn{background:#fee2e2;color:#991b1b}
.mpal{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;margin-top:10px}
.matom{border:1px solid var(--glass-brd);border-radius:14px;padding:8px 0 6px;display:grid;place-items:center;gap:1px;background:var(--glass2);transition:transform .15s,box-shadow .2s}
.matom b{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;font-size:14px;background:radial-gradient(circle at 35% 30%,#fff,var(--c) 60%);color:#0f172a;box-shadow:inset -3px -4px 6px rgba(0,0,0,.2)}
.matom small{font-size:10.5px;color:var(--ink3);font-weight:700}
.matom:hover{transform:translateY(-2px)}.matom.on{box-shadow:0 0 0 2.5px var(--accent)}
.mch{display:grid;gap:5px}.mch .chip{justify-content:flex-start;text-align:start;border-radius:12px;line-height:1.35}.mch .chip.done{background:rgba(34,197,94,.16)}
.mhead h3{margin:0;font-size:32px;letter-spacing:-.02em}.mhead h3 sub{font-size:.6em}.mhead p{margin:2px 0 0;color:var(--ink2);font-size:14px}
.mstatus{margin-top:10px;padding:9px 12px;border-radius:12px;font-size:13.5px;line-height:1.55}.mstatus.ok{background:rgba(34,197,94,.15)}.mstatus.no{background:rgba(250,204,21,.2)}
.mshapes{display:grid;gap:6px}.mshape{display:grid;grid-template-columns:30px 1fr 44px;gap:8px;align-items:center;padding:8px 10px;border-radius:12px;background:var(--glass2);border:1px solid var(--glass-brd)}
.mshape>b{font-size:18px}.mshape strong{display:block;font-size:14px}.mshape small{font-size:12px;color:var(--ink2)}.shicon{color:var(--accent2)}
.mpol{margin-top:10px;padding:10px 12px;border-radius:14px;display:grid;gap:3px}.mpol.p{background:rgba(124,58,237,.12)}.mpol.n{background:rgba(148,163,184,.16)}.mpol small{font-size:12.5px;color:var(--ink2);line-height:1.45}
.mchal{margin-top:14px;padding:12px;border-radius:14px;border:1px dashed var(--glass-brd);display:grid;gap:3px;background:var(--glass2)}.mchal small{font-size:11px;text-transform:uppercase;letter-spacing:.06em;color:var(--ink3)}
.mchal.ok{border-style:solid;border-color:#22c55e;background:rgba(34,197,94,.14)}.mchal span{font-size:13px;color:var(--ink2)}
@media (max-width:1100px){.mols{grid-template-columns:1fr}.mside,.minfo{position:static;max-height:none}.mstage{height:60vh;order:-1}}
.mch .chip.on.done{background:#16a34a;color:#fff}
/* ---------- Phase 7 · Reactions in 3D ---------- */
.rxs .mstage canvas{cursor:grab}
.rxlist{display:grid;gap:6px}
.rxlist button{display:grid;gap:4px;text-align:start;padding:9px 11px;border-radius:14px;border:1px solid var(--glass-brd);background:var(--glass2);color:inherit;font:inherit;cursor:pointer;transition:transform .15s,box-shadow .2s,background .2s}
.rxlist button:hover{transform:translateY(-1px)}.rxlist button.on{background:var(--accent);color:#fff;box-shadow:0 6px 18px rgba(79,70,229,.3)}
.rxlist b{font-size:13.5px;line-height:1.3}.rxlist small{display:flex;gap:6px;flex-wrap:wrap}
.rxtag{display:inline-block;font-size:11px;font-weight:700;padding:1px 8px;border-radius:999px;background:rgba(124,58,237,.14);color:var(--accent2)}
.rxlist .on .rxtag{background:rgba(255,255,255,.22);color:#fff}
.rxpill{font-size:11px;font-weight:700;padding:1px 8px;border-radius:999px;direction:ltr}.rxpill.exo{background:rgba(34,197,94,.16);color:#15803d}.rxpill.endo{background:rgba(234,88,12,.15);color:#c2410c}
.rxlist .on .rxpill{background:rgba(255,255,255,.22);color:#fff}
.rxtemp{display:grid;grid-template-columns:auto 1fr auto;gap:8px;align-items:center}.rxtemp small{font-size:12px;color:var(--ink3);font-weight:700}
.rxs input[type=range]{width:100%;accent-color:var(--accent)}
.rxnote{margin:8px 0 0;font-size:12.5px;color:var(--ink2);line-height:1.5}
.rxeq{position:absolute;top:12px;left:50%;transform:translateX(-50%);display:flex;align-items:center;gap:6px;padding:7px 12px;border-radius:999px;background:var(--glass2);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-brd);font-size:17px;font-weight:700;white-space:nowrap;max-width:94%;overflow-x:auto;scrollbar-width:none}
.rxeq .rq{padding:3px 9px;border-radius:10px;transition:background .35s,color .35s,transform .35s}.rxeq .rq b{color:var(--accent2);margin-inline-end:2px}
.rxeq i{font-style:normal;color:var(--ink3)}.rxeq em{font-style:normal;padding:0 4px;color:var(--ink3);transition:color .3s,transform .3s}
.rxeq.s1 .r,.rxeq.s2 .r,.rxeq.s5 .r{background:rgba(124,58,237,.14)}.rxeq.s3 .p,.rxeq.s4 .p{background:rgba(34,197,94,.18)}
.rxeq.s2 em,.rxeq.s3 em{color:var(--accent);transform:scale(1.25)}.rxeq.s5 em{color:#ef4444;text-decoration:line-through}
.rxcap{position:absolute;left:50%;bottom:40px;transform:translateX(-50%);width:min(560px,92%);display:grid;gap:8px;justify-items:center;text-align:center}
.rxcap p{margin:0;font-size:14px;font-weight:650;padding:8px 14px;border-radius:14px;background:var(--glass2);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-brd);line-height:1.45}
.rxcap.bad p{background:#fee2e2;color:#991b1b}
.rxsteps{display:flex;gap:6px;flex-wrap:wrap;justify-content:center}
.rxsteps button{display:flex;align-items:center;gap:6px;padding:4px 10px 4px 5px;border-radius:999px;border:1px solid var(--glass-brd);background:var(--glass2);backdrop-filter:blur(10px);font:inherit;font-size:12.5px;font-weight:700;color:var(--ink2);cursor:pointer}
.rxsteps i{font-style:normal;width:20px;height:20px;border-radius:50%;display:grid;place-items:center;background:rgba(148,163,184,.25);font-size:11px}
.rxsteps button.on{background:var(--accent);color:#fff;border-color:transparent}.rxsteps button.on i{background:rgba(255,255,255,.25)}
.rxh{font-size:22px!important;line-height:1.25}
.rxabout{margin:8px 0 0;font-size:13.5px;line-height:1.55;color:var(--ink2)}
.rxcond{margin-top:10px;padding:9px 12px;border-radius:12px;background:rgba(250,204,21,.16);font-size:13px;line-height:1.5;display:grid;gap:2px}.rxcond small{font-size:11px;text-transform:uppercase;letter-spacing:.06em;color:var(--ink3);font-weight:700}
.rxdh.exo{background:rgba(34,197,94,.12)}.rxdh.endo{background:rgba(234,88,12,.12)}.rxdh small{display:block;font-size:12px;color:var(--ink2);margin-top:2px}
.rxbt tr.hd td{font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:var(--ink3);font-weight:800;padding-top:10px}
.rxbt tr.br td:first-child{color:#dc2626;font-weight:700}.rxbt tr.fo td:first-child{color:#16a34a;font-weight:700}
.rxbt tr.hot{background:rgba(250,204,21,.25);transition:background .3s}
.rxest{margin-top:10px;padding:10px 12px;border-radius:14px;background:var(--glass2);border:1px solid var(--glass-brd);display:grid;grid-template-columns:1fr 1fr;gap:8px}
.rxest small{display:block;font-size:11.5px;color:var(--ink3);font-weight:700}.rxest b{font-size:15px}.rxest p{grid-column:1/-1;margin:0;font-size:12px;color:var(--ink2)}
.rxion{padding:10px 12px;border-radius:12px;background:rgba(167,139,250,.14)}
.rxat th{font-size:11.5px;color:var(--ink3);text-align:start}.rxat td:last-child{color:#16a34a;font-weight:800}
.mlabels .rxion-c{font-size:12px;font-weight:900;margin-inline-start:1px;padding:0 3px;border-radius:6px;text-shadow:none}.mlabels .rxion-c.p{background:#ede9fe;color:#6d28d9}.mlabels .rxion-c.n{background:#dcfce7;color:#166534}
.mlabels .rxe{font-size:12px;font-weight:800;color:#a16207;text-shadow:0 0 4px #fff;margin:-22px 0 0 6px}
@media (max-width:640px){.rxeq{font-size:14px;top:8px}.rxcap{bottom:30px;width:96%;gap:6px}.rxcap p{font-size:12.5px;padding:6px 10px}.rxsteps{gap:4px;flex-wrap:nowrap}.rxsteps button{font-size:11px;padding:3px 7px 3px 3px;gap:4px}.rxsteps i{width:16px;height:16px;font-size:10px}}
/* ---------- Phase 8 · Game mode ---------- */
.games{display:grid;gap:14px}
.ghero{display:flex;flex-wrap:wrap;gap:16px;align-items:flex-end;justify-content:space-between;padding:22px 24px;border-radius:var(--r-l)}
.ghero h2{margin:0;font-size:34px;letter-spacing:-.02em;background:linear-gradient(90deg,#6366f1,#ec4899,#f59e0b);-webkit-background-clip:text;background-clip:text;color:transparent}
.ghero p{margin:6px 0 0;max-width:620px;color:var(--ink2);line-height:1.55}
.gcards{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
.gcard{position:relative;display:grid;gap:8px;align-content:start;text-align:start;padding:18px;border-radius:26px;border:1px solid var(--glass-brd);color:inherit;font:inherit;cursor:pointer;overflow:hidden;
 background:linear-gradient(160deg,color-mix(in srgb,var(--g1) 16%,transparent),color-mix(in srgb,var(--g2) 10%,transparent)),var(--glass);backdrop-filter:blur(18px) saturate(1.4);-webkit-backdrop-filter:blur(18px) saturate(1.4);
 box-shadow:0 10px 30px rgba(15,23,42,.08),inset 0 1px 0 rgba(255,255,255,.5);transition:transform .25s cubic-bezier(.2,.8,.2,1),box-shadow .25s}
.gcard:hover{transform:translateY(-4px) scale(1.01);box-shadow:0 18px 40px color-mix(in srgb,var(--g1) 28%,transparent)}
.gcard::after{content:"";position:absolute;inset:-40% -20% auto auto;width:180px;height:180px;border-radius:50%;background:radial-gradient(circle,color-mix(in srgb,var(--g2) 35%,transparent),transparent 70%);pointer-events:none}
.gicon{width:64px;height:64px;border-radius:20px;display:grid;place-items:center;font-weight:900;font-size:18px;color:#fff;background:linear-gradient(135deg,var(--g1),var(--g2));box-shadow:0 8px 20px color-mix(in srgb,var(--g1) 40%,transparent);white-space:nowrap;letter-spacing:-.02em}
.gcard h3{margin:4px 0 0;font-size:19px}.gcard p{margin:0;font-size:13px;line-height:1.5;color:var(--ink2);min-height:58px}
.gmeta{display:flex;justify-content:space-between;align-items:center;font-size:12.5px;color:var(--ink2)}.gstars{color:#f59e0b;font-size:17px;letter-spacing:1px}
.gplay{justify-self:start;padding:7px 16px;border-radius:999px;font-weight:800;font-size:13.5px;color:#fff;background:linear-gradient(135deg,var(--g1),var(--g2))}
.gbadges{padding:18px 20px;border-radius:var(--r-l)}.gbadges h3{margin:0 0 12px;font-size:18px}.gbadges h3 small{color:var(--ink3);font-weight:700;margin-inline-start:6px}
.gbgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:10px}
.gbadge{display:grid;grid-template-columns:40px 1fr;column-gap:10px;align-items:center;padding:10px 12px;border-radius:16px;background:var(--glass2);border:1px solid var(--glass-brd);opacity:.55;filter:grayscale(1)}
.gbadge.on{opacity:1;filter:none;background:linear-gradient(135deg,rgba(250,204,21,.18),rgba(236,72,153,.1));border-color:rgba(245,158,11,.45)}
.gbadge span{grid-row:span 2;font-size:26px;text-align:center}.gbadge b{font-size:13.5px}.gbadge small{font-size:11.5px;color:var(--ink2);line-height:1.35}
.linkbtn{background:none;border:0;padding:0;margin-inline-start:6px;color:var(--accent);font:inherit;font-weight:700;cursor:pointer;text-decoration:underline}
.ghud{display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:10px 14px;border-radius:20px}.gname{font-size:17px}.gsp{flex:1}
.gstat{display:grid;text-align:end;line-height:1.15}.gstat small{font-size:10.5px;color:var(--ink3);font-weight:700;text-transform:uppercase;letter-spacing:.05em}.gstat b{font-size:18px}
.gbar{height:6px;border-radius:999px;background:rgba(148,163,184,.25);overflow:hidden;margin-top:-6px}.gbar i{display:block;height:100%;width:100%;border-radius:inherit;background:linear-gradient(90deg,#22c55e,#facc15,#ef4444);background-size:300% 100%;transition:width .1s linear}
.gbody{padding:20px;border-radius:var(--r-l);min-height:420px}
.gclue,.gbig{font-size:24px;text-align:center;margin:4px 0 14px;line-height:1.4}.gbig i{font-style:normal;color:var(--ink3);margin:0 6px}.gq{text-align:center;color:var(--ink2);margin:0 0 6px}
.gpt{display:grid;grid-template-columns:repeat(18,minmax(0,1fr));grid-template-rows:repeat(7,auto) 10px repeat(2,auto);gap:3px;max-width:980px;margin:0 auto}
.gpt button{aspect-ratio:1;min-width:0;padding:0;border-radius:8px;border:1px solid var(--glass-brd);background:var(--glass2);font:inherit;font-weight:800;font-size:clamp(9px,1.25vw,15px);color:inherit;cursor:pointer;transition:transform .12s,background .2s}
.gpt button:hover{transform:scale(1.12);z-index:1;background:#fff;box-shadow:0 4px 12px rgba(0,0,0,.15)}:root[data-theme="dark"] .gpt button:hover{background:#334155}
.gpt button.dim{opacity:.35}.gpt button.ok{background:#22c55e;color:#fff;animation:gpop .5s}.gpt button.bad{background:#ef4444;color:#fff;animation:gshake .45s}.gpt button.show{background:#22c55e;color:#fff;animation:gpulse 1s infinite}
.gfb{text-align:center;min-height:26px;margin:14px 0 0;font-size:15px;line-height:1.5}.okc{color:#16a34a}.badc{color:#dc2626}.warnc{color:#b45309}
.gfb.badc,.gfb.warnc{font-weight:700}
.gopts{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;max-width:640px;margin:10px auto 0}
.gopts button{padding:16px 12px;border-radius:18px;border:1px solid var(--glass-brd);background:var(--glass2);font:inherit;font-size:19px;font-weight:700;color:inherit;cursor:pointer;transition:transform .15s,background .2s,box-shadow .2s}
.gopts button:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 8px 20px rgba(79,70,229,.15)}.gopts button.ok{background:#22c55e;color:#fff;animation:gpop .5s}.gopts button.bad{background:#ef4444;color:#fff;animation:gshake .45s}.gopts button:disabled{cursor:default}
.gopts button i{font-style:normal;color:inherit;opacity:.6}
.geq{display:flex;flex-wrap:wrap;justify-content:center;align-items:flex-end;gap:8px;font-size:22px;font-weight:700;margin-top:10px}.geq>i{font-style:normal;color:var(--ink3);padding-bottom:4px}
.gsp2{display:grid;justify-items:center;gap:6px}.gstep{display:flex;align-items:center;gap:4px;padding:3px;border-radius:999px;background:var(--glass2);border:1px solid var(--glass-brd)}
.gstep button{width:30px;height:30px;border-radius:50%;border:0;background:rgba(99,102,241,.14);color:var(--accent);font:inherit;font-weight:900;font-size:18px;cursor:pointer}.gstep button:active{transform:scale(.9)}.gstep b{min-width:22px;text-align:center;font-size:18px}
.gtally{display:flex;flex-wrap:wrap;justify-content:center;gap:6px;margin-top:14px}.gtally span{padding:4px 10px;border-radius:999px;font-size:13px}.gtally .eq{background:rgba(34,197,94,.16)}.gtally .ne{background:rgba(239,68,68,.14)}
.shake{animation:gshake .45s}
.gtrack{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:6px;margin:8px 0 16px}.gnode{padding:6px 12px;border-radius:999px;background:var(--glass2);border:1px solid var(--glass-brd);font-weight:700;font-size:14px}
.gnode.start{background:rgba(99,102,241,.14)}.gnode.done{background:rgba(34,197,94,.18)}.gnode.cur{background:var(--accent);color:#fff;animation:gpulse 1.4s infinite}.garr{font-style:normal;color:var(--ink3)}
.gco{color:var(--accent2);margin-inline-end:1px}.gcond{text-align:center;color:var(--ink2);margin:-6px 0 8px;font-size:14px}
.gtoast{position:fixed;left:50%;bottom:28px;transform:translate(-50%,40px);opacity:0;padding:10px 18px;border-radius:999px;background:rgba(15,23,42,.88);color:#fff;font-weight:700;font-size:14px;transition:.3s;pointer-events:none;z-index:60;backdrop-filter:blur(10px)}
.gtoast.show{opacity:1;transform:translate(-50%,0)}.gtoast span{font-size:18px;margin-inline-end:4px}
.gres{position:relative;overflow:hidden;text-align:center;padding:30px 20px;border-radius:var(--r-l);max-width:640px;margin:0 auto;width:100%}.gres h2{margin:0;font-size:28px}
.gbigstars{display:flex;justify-content:center;gap:10px;margin:14px 0 6px}.gbigstars span{font-size:56px;color:rgba(148,163,184,.4);transform:scale(.4);animation:gstar .5s forwards}.gbigstars span.on{color:#f59e0b;text-shadow:0 6px 20px rgba(245,158,11,.5)}
.gfinal{display:grid;margin:4px 0}.gfinal span{font-size:12px;color:var(--ink3);text-transform:uppercase;letter-spacing:.08em;font-weight:800}.gfinal b{font-size:46px;letter-spacing:-.03em}
.gnew{display:inline-block;padding:6px 14px;border-radius:999px;background:linear-gradient(90deg,#facc15,#f97316);color:#fff;font-weight:800;animation:gpop .6s}
.gearn{display:grid;gap:8px;max-width:340px;margin:14px auto 0;text-align:start}
.gconf{position:absolute;inset:0;pointer-events:none}.gconf i{position:absolute;top:-12px;width:8px;height:14px;border-radius:2px;animation:gfall linear forwards}
@keyframes gpop{0%{transform:scale(.8)}60%{transform:scale(1.12)}100%{transform:scale(1)}}
@keyframes gshake{0%,100%{transform:translateX(0)}20%{transform:translateX(-7px)}40%{transform:translateX(7px)}60%{transform:translateX(-5px)}80%{transform:translateX(5px)}}
@keyframes gpulse{0%,100%{box-shadow:0 0 0 0 rgba(34,197,94,.6)}50%{box-shadow:0 0 0 7px rgba(34,197,94,0)}}
@keyframes gstar{to{transform:scale(1)}}
@keyframes gfall{to{top:110%;transform:rotate(540deg)}}
@media (max-width:1100px){.gcards{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:640px){.gcards{grid-template-columns:1fr}.ghero h2{font-size:28px}.gclue,.gbig{font-size:19px}.gopts{grid-template-columns:1fr}.gbody{padding:14px}.gpt{gap:2px}.gpt button{border-radius:5px;font-size:9px}.geq{font-size:18px}.gstat b{font-size:16px}}
@media (prefers-reduced-motion:reduce){.gcard,.gopts button,.gpt button{transition:none}.gconf{display:none}.gbigstars span{animation:none;transform:none}}
.gscreen{max-width:1100px;margin:0 auto;width:100%}
@media (min-width:901px) and (max-width:1380px){.ch-nav button{padding:7px 9px;font-size:13px}}
@media (min-width:901px) and (max-width:1180px){.ch-nav button{padding:6px 7px;font-size:12.5px}}
.gptw{overflow-x:auto;scrollbar-width:thin;padding-bottom:4px}
@media (max-width:640px){.gpt{width:600px;max-width:none}.gpt button{font-size:11px;border-radius:6px}}
.games,.gscreen>*,.gbody{min-width:0}.gptw{max-width:100%}
/* ---------- Phase 9 · polish ---------- */
@media (max-width:1100px){.wmake,.wprac,.wprog{grid-template-columns:minmax(0,1fr)}.wmake>*,.wprac>*,.wprog>*{min-width:0}}
@media (max-width:640px){#iTabs{display:grid;grid-template-columns:1fr 1fr;border-radius:18px}#iTabs button{border-radius:14px}}
@media (max-width:1100px){.tools-mass,.tools-bal,.tools-lab,.tpanel.two{grid-template-columns:minmax(0,1fr)}.tools-mass>*,.tools-bal>*,.tools-lab>*{min-width:0}}
@media (max-width:640px){#tTabs{display:grid;grid-template-columns:1fr 1fr;border-radius:18px}#tTabs button{border-radius:14px;white-space:normal}}
@media (max-width:420px){.tbl td,.tbl th{padding-left:5px;padding-right:5px}.tbl{font-size:12.5px}}
@media (max-width:420px){.tools-mass .tbl{display:block;overflow-x:auto;max-width:100%}}
:where(button,a,input,select,textarea,[tabindex]):focus-visible{outline:2.5px solid var(--accent);outline-offset:2px}
.gpt button:focus-visible,.rxlist button:focus-visible,.gcard:focus-visible,.gopts button:focus-visible{outline:3px solid var(--accent);outline-offset:2px;z-index:2}
/* light effects: for weak devices (auto) or when chosen in Settings — no moving blurred background, no live blur behind glass */
.lite .ch-aurora{filter:none;opacity:.5}.lite .ch-aurora i{animation:none!important}
.lite *{backdrop-filter:none!important;-webkit-backdrop-filter:none!important}
.lite .glass,.lite .ch-top,.lite .gcard,.lite .rxeq,.lite .rxcap p,.lite .mhint{background-color:rgba(248,250,255,.94)}
:root[data-theme="dark"].lite .glass,:root[data-theme="dark"].lite .ch-top,:root[data-theme="dark"].lite .gcard,:root[data-theme="dark"].lite .rxeq,:root[data-theme="dark"].lite .rxcap p,:root[data-theme="dark"].lite .mhint{background-color:rgba(20,24,40,.95)}
/* ---------- Guided tour ---------- */
.help-btn{font-weight:900;font-size:16px;color:var(--accent)}
.tour{position:fixed;inset:0;z-index:1000;opacity:0;transition:opacity .25s}
.tour.show{opacity:1}
.tour-hole{position:fixed;border-radius:16px;box-shadow:0 0 0 200vmax rgba(8,12,30,.58),0 0 0 3px rgba(255,255,255,.9),0 0 24px 6px rgba(129,140,248,.55);pointer-events:none;
 transition:left .35s cubic-bezier(.2,.8,.2,1),top .35s cubic-bezier(.2,.8,.2,1),width .35s cubic-bezier(.2,.8,.2,1),height .35s cubic-bezier(.2,.8,.2,1)}
.tour.center .tour-hole{box-shadow:0 0 0 200vmax rgba(8,12,30,.58)}
.tour-pop{position:fixed;padding:16px 18px 14px;border-radius:22px;background:rgba(255,255,255,.86);backdrop-filter:blur(22px) saturate(1.6);-webkit-backdrop-filter:blur(22px) saturate(1.6);
 border:1px solid rgba(255,255,255,.7);box-shadow:0 24px 60px rgba(8,12,30,.35),inset 0 1px 0 rgba(255,255,255,.8);color:var(--ink);transition:left .35s cubic-bezier(.2,.8,.2,1),top .35s cubic-bezier(.2,.8,.2,1);animation:tourIn .35s cubic-bezier(.2,.8,.2,1)}
:root[data-theme="dark"] .tour-pop{background:rgba(22,27,48,.88);border-color:rgba(255,255,255,.12)}
.tour-top{display:flex;justify-content:space-between;align-items:center;gap:8px}
.tour-count{font-size:11.5px;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:var(--accent)}
.tour-skip{border:0;background:none;color:var(--ink3);font:inherit;font-size:13px;font-weight:700;cursor:pointer;padding:4px 6px;border-radius:8px}.tour-skip:hover{color:var(--ink)}
.tour-pop h3{margin:6px 0 4px;font-size:18px;letter-spacing:-.01em}
.tour-pop p{margin:0;font-size:14.5px;line-height:1.55;color:var(--ink2)}
.tour-dots{display:flex;gap:5px;margin:12px 0 10px;flex-wrap:wrap}.tour-dots i{width:7px;height:7px;border-radius:99px;background:rgba(148,163,184,.4);transition:width .25s,background .25s}
.tour-dots i.past{background:rgba(99,102,241,.45)}.tour-dots i.on{width:20px;background:var(--accent)}
.tour-btns{display:flex;justify-content:space-between;gap:8px}.tour-btns .btn{flex:1;justify-content:center}.tour-btns .btn:disabled{opacity:.4;cursor:default}
@keyframes tourIn{from{transform:translateY(8px) scale(.97);opacity:0}}
.lite .tour-pop{background:rgba(255,255,255,.98)}:root[data-theme="dark"].lite .tour-pop{background:rgba(22,27,48,.98)}
@media (prefers-reduced-motion:reduce){.tour-hole,.tour-pop{transition:none;animation:none}}
/* the ❓ stays reachable while a card is open: the top bar sits above the card's backdrop on wide screens, and the card has its own ❓ on narrow ones */
@media (min-width:901px){.ch-top{z-index:55}}
.card-help{position:absolute;top:16px;inset-inline-end:58px;z-index:5;display:none}
@media (max-width:900px){.card-help{display:grid}}
@media (min-width:901px){.backdrop{padding-top:80px}.sheet{max-height:calc(100vh - 98px)}}
/* ---------- menus that open from the top bar (hub switch ▾, the Math Hub strand menus, settings) blur the page behind them.
   A blur inside the bar's own blur only sees the bar, so the page behind a menu stayed sharp. The bar's frosted glass is now
   drawn by two layers behind its content — the blur (::before), then the glass colour and its top highlight (::after) — so the
   bar looks exactly as before, and each menu's own glass blur reaches the page. (Light effects keep their solid bar.) ---------- */
html:not(.lite) .ch-top.glass{background:transparent;border-color:transparent;backdrop-filter:none;-webkit-backdrop-filter:none;box-shadow:var(--shadow)}
html:not(.lite) .ch-top.glass::before,html:not(.lite) .ch-top.glass::after{content:"";position:absolute;inset:-1px;border-radius:inherit;pointer-events:none}
html:not(.lite) .ch-top.glass::before{z-index:-2;backdrop-filter:var(--blur);-webkit-backdrop-filter:var(--blur)}
html:not(.lite) .ch-top.glass::after{z-index:-1;background:var(--glass);border:1px solid var(--glass-brd);box-shadow:inset 0 1px 0 var(--glass-hi)}
/* cross-hub phase B · the full-screen button (math-fs.js) in every hub: the same button as in the Math Hub, in the top corner of a
   picture. The Math Hub keeps its own copy of these rules in math.css. */
.qfs{position:absolute;top:8px;right:8px;z-index:4;width:34px;height:34px;padding:0;border-radius:10px;border:1px solid rgba(100,116,139,.35);background:rgba(255,255,255,.88);color:#1e293b;display:grid;place-items:center;cursor:pointer;box-shadow:0 2px 8px rgba(15,23,42,.14);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);opacity:.9;transition:opacity .15s,transform .15s}
.qfs:hover{opacity:1;transform:scale(1.06)}.qfs:focus{outline:none}.qfs:focus-visible{outline:3px solid #6366f1;outline-offset:2px}
.qfs-on.mfull{position:fixed;inset:0;z-index:2000;height:100dvh}
html.mfull-page,html.mfull-page body{overflow:hidden}
@media print{.qfs{display:none!important}}
/* the pictures of Orbitals, Molecules and Reactions full screen */
.orb-stage.qfs-on,.mstage.qfs-on{width:100vw;height:100vh;min-height:0;max-width:none;margin:0;border-radius:0;box-sizing:border-box}
.mstage.qfs-on{background:radial-gradient(120% 90% at 50% 20%,#fff,#dbe4f2)}:root[data-theme="dark"] .mstage.qfs-on{background:radial-gradient(120% 90% at 50% 20%,#1e2440,#0b0f1e)}
.orb-stage.qfs-on.mfull,.mstage.qfs-on.mfull{height:100dvh}
.orb-stage>.qfs{right:auto;inset-inline-end:10px;top:10px}
@media (max-width:640px){#rStage .rxeq{top:50px}}
#mStage .mhint{max-width:min(80%,calc(100% - 110px))}
/* cross-hub phase C · 📝 Exam mode, the same page in the three hubs (exam-core.js) */
.xm{display:grid;gap:16px}
.xm-hero{padding:18px 24px;border-radius:22px}.xm-hero h1{margin:6px 0 4px;font-size:30px;letter-spacing:-.02em}.xm-hero p{margin:0;color:var(--ink2);max-width:780px;line-height:1.5}
.xm-back{text-decoration:none;font-weight:700}
.xm-grid{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:16px;align-items:start}.xm-main{min-width:0;display:grid;gap:14px}
.xm-card{padding:18px 22px;border-radius:20px;min-width:0}.xm-side{padding:16px 18px;border-radius:20px;position:sticky;top:84px;max-height:calc(100vh - 100px);overflow:auto;scrollbar-width:thin}
.xm-setup>.ctl-label:first-child{margin-top:0}.xm-mode{margin:4px 0 6px;flex-wrap:wrap}.xm-chips{flex-wrap:wrap;gap:6px}.xm-chips .chip small{font-weight:800;color:var(--accent);margin-inline-start:4px}
.xm-rowh{display:flex;justify-content:space-between;align-items:center;gap:8px;flex-wrap:wrap}.xm-rowh .ctl-label{margin-bottom:0}
.xm-row{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-top:12px}.xm-rowh .xm-row{margin-top:0}
.xm-opts3{display:flex;gap:10px 22px;flex-wrap:wrap}.xm-opts3>div{min-width:0}
.xm-note{font-size:13px;color:var(--ink3);line-height:1.5;margin:8px 0 0}.xm-bad{color:#dc2626;font-weight:700;margin:8px 0 0}.xm-new{font-weight:800;color:#b45309;margin:6px 0 0}
.xm-ul{margin:10px 0 0;padding-inline-start:18px;font-size:13px;color:var(--ink2);line-height:1.6}
.xm-top{display:flex;justify-content:space-between;align-items:center;gap:10px}.xm-top .ctl-label{margin:0}
.xm-clock{font:800 22px 'Courier New',monospace;color:var(--ink)}.xm-clock.low{color:#dc2626}
.xm-time{height:8px;border-radius:99px;background:var(--glass-brd);overflow:hidden;margin:8px 0 12px}.xm-time i{display:block;height:100%;width:100%;background:linear-gradient(90deg,#22c55e,#06b6d4);transition:width .25s linear}.xm-time i.low{background:linear-gradient(90deg,#ef4444,#f59e0b)}
.xm-dots{display:flex;flex-wrap:wrap;gap:5px;margin-top:8px}.xm-dots button{width:30px;height:30px;border-radius:9px;border:1px solid var(--glass-brd);background:var(--glass2);font-weight:800;font-size:12px;color:var(--ink2);cursor:pointer}
.xm-dots .done{background:rgba(99,102,241,.18);color:#4f46e5}.xm-dots .cur{outline:2.5px solid var(--accent);outline-offset:1px}
.xm-q{margin:16px 0 12px;font-size:19px;line-height:1.5}.xm-qt{margin:0}.xm-q .qeq{margin:10px 0 0;font-size:20px}.xm-q .given{display:block;margin-top:6px;font-size:13px;color:var(--ink3)}
.xm-opts{display:grid;gap:10px}
.xm-opt{display:flex;gap:12px;align-items:center;text-align:start;padding:12px 16px;border-radius:14px;border:1.5px solid var(--glass-brd);background:var(--glass2);font-size:15.5px;font-weight:600;color:var(--ink);cursor:pointer}
.xm-opt .xm-k{width:28px;height:28px;flex:none;border-radius:8px;display:grid;place-items:center;background:rgba(99,102,241,.14);color:#4f46e5;font-weight:900;font-size:13px}
.xm-opt:hover{border-color:var(--accent)}.xm-opt.on{border-color:var(--accent);background:rgba(99,102,241,.14)}.xm-opt.on .xm-k{background:var(--accent);color:#fff}
.xm-inrow{display:flex;gap:8px;align-items:center}.xm-in{flex:1;min-width:0;max-width:420px;font-size:17px;padding:10px 14px;border-radius:12px;border:1.5px solid var(--glass-brd);background:var(--glass2);color:var(--ink)}.xm-in:focus{outline:none;border-color:var(--accent)}
.xm-unit{font-weight:800;color:var(--ink2)}
.xm-keys{display:flex;flex-wrap:wrap;gap:4px;margin-top:8px}.xm-keys button{border:1px solid rgba(100,116,139,.35);background:var(--glass);color:var(--ink);border-radius:8px;min-width:34px;padding:4px 7px;font-weight:700;cursor:pointer;direction:ltr}
.xm-coef{flex-wrap:wrap}
.xm-nav{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-top:18px}.xm-left{flex:1;text-align:center;margin:0}
.xm-res{display:flex;flex-wrap:wrap;gap:22px;align-items:center}.xm-res h2{margin:0 0 6px;font-size:26px}.xm-resb{flex:1;min-width:240px}.xm-resb p{margin:4px 0}
.xm-score{width:140px;height:140px;border-radius:50%;display:grid;place-content:center;text-align:center;background:radial-gradient(closest-side,var(--glass2) 78%,transparent 79% 100%),conic-gradient(#7c3aed calc(var(--p)*1%),var(--glass-brd) 0)}.xm-score b{font-size:30px}.xm-score span{font-weight:800;color:var(--ink3)}
.xm-h{font-size:17px;margin:6px 0 0;color:var(--ink2)}.xm-rev{display:grid;gap:10px}
.xm-ri{padding:12px 16px;border-radius:14px;background:var(--glass2);border:1px solid var(--glass-brd);border-inline-start:5px solid #22c55e}.xm-ri.bad{border-inline-start-color:#ef4444}
.xm-riq{display:flex;gap:10px;align-items:baseline}.xm-riq>div{min-width:0;flex:1}.xm-n{flex:none;display:grid;place-items:center;min-width:26px;height:26px;border-radius:8px;background:rgba(99,102,241,.14);color:#4f46e5;font-size:12.5px}
.xm-a{margin:6px 0 0;font-size:14px}.xm-a.ok{color:#15803d}.xm-a.bad{color:#b91c1c}.xm-w{margin:4px 0 0;font-size:13.5px;color:var(--ink2)}.xm-w a{color:var(--accent);font-weight:700}
:root[data-theme="dark"] .xm-a.ok{color:#4ade80}:root[data-theme="dark"] .xm-a.bad{color:#f87171}:root[data-theme="dark"] .xm-dots .done,:root[data-theme="dark"] .xm-opt .xm-k,:root[data-theme="dark"] .xm-n{color:#a5b4fc}
.xm-list{display:grid;gap:6px}.xm-list>div{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:7px 10px;border-radius:10px;background:var(--glass2);border:1px solid var(--glass-brd);font-size:13px}
.xm-list b{color:var(--accent);flex:none}.xm-hist>div>span{position:relative;display:block;min-width:0;padding-bottom:5px}.xm-hist i{position:absolute;inset-inline-start:0;bottom:0;height:3px;border-radius:3px;background:var(--accent);opacity:.55}
.xm-sh{margin-top:16px}.xm-tips{margin:4px 0 0;padding-inline-start:18px;font-size:13px;color:var(--ink2);line-height:1.55}
.xm .pxf{display:inline-flex;flex-direction:column;vertical-align:middle;text-align:center;font-size:.86em;line-height:1.08;margin:0 .08em}.xm .pxf>span:first-child{border-bottom:1.5px solid currentColor;padding:0 .18em}
.wsheet .ions-top{gap:10px;flex-wrap:wrap;align-items:center}
@media (max-width:900px){.xm-grid{grid-template-columns:1fr}.xm-side{position:static;max-height:none}}
@media (max-width:640px){.xm-hero h1{font-size:24px}.xm-card{padding:14px 16px}.xm-q{font-size:17px}.xm-score{width:116px;height:116px}.xm-score b{font-size:24px}.xm-clock{font-size:18px}}
@media print{.xm-side,.xm-nav,.xm-back{display:none!important}}