/* Simple Learning Hub — Class 12 Chemistry Learn add-ons (formula cards, experiments, 3D cards, quiz). Uses the site's CSS variables. */
.cxfm{display:flex;flex-direction:column;gap:4px;border:1px solid var(--line);background:linear-gradient(180deg,var(--card),var(--soft));border-radius:14px;padding:12px 14px;margin:12px 0;box-shadow:0 1px 0 rgba(0,0,0,.03)}
.cxfm .f{font:700 1.12rem/1.5 "Cambria Math","STIX Two Math","Times New Roman",serif;color:var(--ink);overflow-wrap:anywhere;padding:2px 0}
.cxfm .c{font-size:.88rem;color:var(--mut);line-height:1.5}
.lrn .box.cxtip{border-left-color:#7e57c2}.lrn .box.cxwarn{border-left-color:#e8743b}.lrn .box.cxkey{border-left-color:var(--link)}
.lrn .box.ex b.bt::before{content:"✍ "}.lrn .box.cxtip b.bt::before{content:"🏆 "}.lrn .box.cxwarn b.bt::before{content:"⚠ "}
.lrn sub,.lrn sup{font-size:.72em;line-height:0}
.cxm3{display:flex;align-items:center;gap:10px;width:100%;text-align:left;border:1px solid var(--line);background:linear-gradient(135deg,#0d1a26,#14324a);color:#eaf2f8;border-radius:14px;padding:10px 12px;margin:12px 0;cursor:pointer;font:inherit}
.cxm3 .i{flex:none;width:44px;height:44px;border-radius:12px;display:grid;place-items:center;font-weight:800;background:radial-gradient(circle at 35% 30%,#7fd0ff,#1f6fb2);color:#fff;box-shadow:inset 0 -3px 8px rgba(0,0,0,.25)}
.cxm3 b{display:block;font-size:.98rem}.cxm3 small{display:block;opacity:.75;font-size:.8rem;margin-top:2px}.cxm3 .go{margin-left:auto;font-weight:800;font-size:.8rem;border:1px solid rgba(255,255,255,.35);border-radius:999px;padding:5px 10px}
.cxm3c{cursor:pointer;font:inherit;text-align:left}.cxm3c .cxm3th{display:block;border-radius:9px;overflow:hidden;background:#0d1a26}.cxm3c .cxm3th img{display:block;width:100%;aspect-ratio:1;object-fit:cover}
.cxmod{position:fixed;inset:0;z-index:90;background:#05080b;display:flex;flex-direction:column}
.cxmod .cxmh{display:flex;align-items:center;justify-content:space-between;padding:8px 10px;color:#eaf2f8;background:#0b141c}
.cxmod .cxx{width:40px;height:40px;border-radius:50%;border:0;background:rgba(255,255,255,.12);color:#fff;font-size:18px;cursor:pointer}
.cxmod iframe{flex:1;width:100%;border:0;display:block}
html.cxlock,html.cxlock body{overflow:hidden}
/* experiments */
.cxlab{border:1px solid var(--line);border-radius:16px;background:var(--card);padding:12px;margin:16px 0;box-shadow:0 2px 10px rgba(8,28,44,.06)}
.cxlab .cxload{color:var(--mut);font-size:.9rem}
.cxlh{display:flex;align-items:center;gap:8px;margin-bottom:8px}.cxlh .ico{font-size:1.3rem}.cxlh b{font-size:1.02rem}.cxlh .tag{margin-left:auto;font-size:.7rem;font-weight:800;letter-spacing:.05em;text-transform:uppercase;color:#2e7d32;background:rgba(46,125,50,.12);border-radius:999px;padding:3px 8px}
.cxp{font-size:.92rem;line-height:1.55;margin:4px 0 8px}
.cxnote{font-size:.78rem;color:var(--mut);line-height:1.5;margin:8px 0 0}
.cxrow{display:flex;gap:12px;align-items:flex-start}.cxsvg{flex:0 0 112px;max-width:112px}.cxctl{flex:1;min-width:0}
.cxctl label,.cxl{display:block;font-size:.9rem;margin:6px 0 2px}
.cxlab input[type=range]{width:100%;height:32px;accent-color:#1f7ae0}
.cxbtns{display:flex;gap:6px;flex-wrap:wrap;margin:6px 0}
.cxb{font:700 .9rem/1 inherit;font-family:inherit;height:38px;padding:0 14px;border-radius:999px;border:0;background:#1f7ae0;color:#fff;cursor:pointer}
.cxb.ghost{background:transparent;color:var(--ink);border:1.5px solid var(--line)}
.cxout{display:grid;gap:4px;margin-top:8px;font-size:.88rem}
.cxout>div{display:flex;justify-content:space-between;gap:10px;border-bottom:1px dashed var(--line);padding:4px 0}.cxout>div span{color:var(--mut)}.cxout>div b{text-align:right;font-variant-numeric:tabular-nums}
.cxout .msg{display:block;border:0;background:var(--soft);border-radius:10px;padding:8px 10px;font-weight:600;color:var(--ink);line-height:1.45}
.cxout .msg.b{background:rgba(31,122,224,.12)}.cxout .msg.r{background:rgba(198,40,40,.12)}.cxout .msg.g{background:rgba(46,125,50,.14)}
.cxgraph{width:100%;height:auto;display:block;color:var(--ink);background:var(--soft);border-radius:12px}
.cxcan{width:100%;height:auto;display:block;background:#f4f8fb;border-radius:12px}
.cxlab .seg{display:flex;gap:4px;flex-wrap:wrap;margin:4px 0}.cxlab .seg button{font:700 .86rem/1 inherit;font-family:inherit;height:36px;padding:0 12px;border-radius:999px;border:1.5px solid var(--line);background:transparent;color:var(--ink);cursor:pointer}.cxlab .seg button[aria-pressed=true]{background:#0f2a3d;color:#fff;border-color:#0f2a3d}
.cxth{display:flex;gap:10px;justify-content:space-around;margin:10px 0 2px;text-align:center}
.cxth .th{display:flex;flex-direction:column;align-items:center;gap:3px;font-size:.82rem;flex:1}
.cxth .tube{position:relative;width:18px;height:110px;border-radius:9px;background:var(--soft);border:2px solid var(--line);overflow:hidden}
.cxth .tube i{position:absolute;left:0;right:0;bottom:0;background:linear-gradient(#ff7043,#d84315);transition:height .35s}
.cxth .cold .tube i{background:linear-gradient(#64b5f6,#1565c0)}.cxth .osm .tube i{background:linear-gradient(#ba68c8,#6a1b9a)}
.cxth small{color:var(--mut)}
#hb_bub circle.up{animation:cxup 1.4s ease-in infinite}
@keyframes cxup{0%{transform:translateY(0);opacity:.9}100%{transform:translateY(-90px);opacity:0}}
/* quiz */
.cxquiz .cxq{border-top:1px dashed var(--line);padding:8px 0}
.cxquiz .cxq p{margin:4px 0}
.cxquiz .opts{display:grid;gap:6px;margin-top:6px}
.cxquiz .opts button{text-align:left;font:600 .93rem/1.35 inherit;font-family:inherit;padding:9px 12px;border-radius:12px;border:1.5px solid var(--line);background:var(--card);color:var(--ink);cursor:pointer}
.cxquiz .opts button.ok{border-color:#2e7d32;background:rgba(46,125,50,.14)}.cxquiz .opts button.no{border-color:#c62828;background:rgba(198,40,40,.12)}
.cxquiz .why{font-size:.88rem;color:var(--mut)}
.cxscore{font-weight:800;font-size:1.05rem;text-align:center;background:var(--soft);border-radius:12px;padding:10px}
.cxtable{width:100%;border-collapse:collapse;font-size:.88rem;margin:10px 0}.cxtable th,.cxtable td{border-bottom:1px solid var(--line);padding:6px 6px;text-align:left}.cxtable th{color:var(--mut);font-weight:700}
.cxtw{overflow-x:auto;-webkit-overflow-scrolling:touch}
@media (prefers-reduced-motion:reduce){#hb_bub circle.up{animation:none}}
.cxrow2{display:flex;gap:8px;margin:6px 0}.cxrow2 label{flex:1;font-size:.82rem;color:var(--mut);display:flex;flex-direction:column;gap:3px}.cxsel{font:600 .9rem/1.2 inherit;font-family:inherit;padding:8px;border-radius:10px;border:1.5px solid var(--line);background:var(--card);color:var(--ink);width:100%}

.lrn .tb,.lrn .cxfm .f{overflow-wrap:anywhere}

.c5lig{display:grid;grid-template-columns:1fr;gap:6px;margin:10px 0}
@media(min-width:560px){.c5lig{grid-template-columns:1fr 1fr}}
.c5l{display:flex;align-items:center;gap:8px;padding:6px 8px;border:1px solid var(--line,#dde5ec);border-radius:12px;background:#fff}
.c5l span{flex:1;min-width:0;display:flex;flex-direction:column}.c5l small{color:var(--mut,#56636e);font-size:12px;overflow-wrap:anywhere}
.c5l output{min-width:20px;text-align:center;font-weight:800}
.c5pm{width:34px;height:34px;border-radius:10px;border:1px solid #c9d6e0;background:#f4f8fb;font-size:18px;font-weight:800;cursor:pointer;color:#14212b}
.c5name{margin:12px 0;padding:12px;border-radius:14px;background:#f3f8ff;border:1px solid #cfe3f7}
.c5f{font-size:20px;font-weight:800;color:#0f3a5a;overflow-wrap:anywhere}.c5n{font-size:16px;font-weight:700;color:#6a1b9a;margin-top:4px;overflow-wrap:anywhere}
.c5warn{color:#b71c1c;font-weight:700;margin:6px 0}.c5steps{margin:8px 0 0 18px;padding:0;font-size:14px;line-height:1.5}
.c5chips{display:flex;flex-wrap:wrap;gap:6px;margin:10px 0}
.c5chip{border:1px solid #c9d6e0;background:#fff;border-radius:999px;padding:7px 11px;font-size:13px;font-weight:700;cursor:pointer;color:#14212b}
.c5chip[aria-pressed=true]{background:#0f3a5a;color:#fff;border-color:#0f3a5a}
.c5card{padding:12px;border-radius:14px;border:1px solid #dde5ec;background:#fbfcfd}.c5ex{color:var(--mut,#56636e);font-weight:700;margin:2px 0 6px}
.c5cnt{font-size:15px;margin:4px 0}.c5iso{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:8px;margin-top:8px}
.c5i{display:flex;flex-direction:column;align-items:flex-start;gap:2px;text-align:left;padding:10px;border-radius:12px;border:1px solid #c9d6e0;background:#fff;font:inherit;color:#14212b}
button.c5i{cursor:pointer}.c5i b{font-size:16px}.c5i small{color:var(--mut,#56636e)}.c5i span{margin-top:4px;font-size:12px;font-weight:800;color:#fff;background:#1565c0;border-radius:8px;padding:2px 8px}
.c5cu{display:flex;align-items:center;gap:10px;margin-top:8px}.c5cu span{width:34px;height:34px;flex:none;border-radius:50%;border:2px solid #cfd8dc}.c5cu b{font-size:14px}

.c9chips{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0}
.c9chip{border:1px solid #c9d6e0;background:#fff;border-radius:999px;padding:7px 11px;font-size:13px;font-weight:700;cursor:pointer;color:#14212b;font-family:inherit}
.c9chip[aria-pressed=true]{background:#0f3a5a;color:#fff;border-color:#0f3a5a}
.c9bars{margin:8px 0;display:flex;flex-direction:column;gap:5px}
.c9bar{display:grid;grid-template-columns:minmax(0,1fr) 58px;gap:6px;align-items:center;font-size:13px}
.c9bar .t{position:relative;height:26px;border-radius:8px;background:#eef3f7;overflow:hidden}
.c9bar .t i{position:absolute;left:0;top:0;bottom:0;border-radius:8px}
.c9bar .t span{position:relative;z-index:1;display:block;padding:4px 8px;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.c9bar b{text-align:right;font-variant-numeric:tabular-nums}
.c9card{padding:12px;border-radius:14px;border:1px solid #dde5ec;background:#fbfcfd;margin:10px 0}
.c9ord{font-size:17px;font-weight:800;color:#0f3a5a;overflow-wrap:anywhere;margin:6px 0}
.c9fac{display:grid;grid-template-columns:110px repeat(3,minmax(0,1fr));gap:4px;font-size:12.5px;align-items:center;margin-top:6px}
.c9fac div{padding:5px 4px;border-radius:8px;text-align:center;background:#eef3f7;font-weight:700}
.c9fac .h{background:none;text-align:left;color:var(--mut,#56636e)}
.c9ok{color:#1b7f3a;font-weight:800}.c9no{color:#c62828;font-weight:800}
.c9tubes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:10px 0}
.c9tube{border:1px solid #dde5ec;border-radius:14px;padding:8px 6px;text-align:center;background:#fff;cursor:pointer;font-family:inherit;color:#14212b}
.c9tube[aria-pressed=true]{border:2px solid #1f7ae0;background:#f3f8ff}
.c9tube svg{width:100%;max-width:90px;height:auto;display:block;margin:0 auto}
.c9tube small{display:block;font-size:11.5px;color:var(--mut,#56636e);min-height:2.4em;overflow-wrap:anywhere}
.c9log{font-size:13.5px;line-height:1.5;margin:6px 0;padding-left:18px}
.c9beaker{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin:10px 0}
.c9beaker svg{width:120px;height:auto;flex:none}
.c9beaker .r{flex:1;min-width:160px}
.c9eq{font-size:14px;font-weight:700;color:#14212b;overflow-wrap:anywhere;background:#f4f8fb;border-radius:10px;padding:8px 10px;margin:6px 0}
.c9grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px;margin:8px 0}
.c9rg{border:1px solid #c9d6e0;background:#fff;border-radius:12px;padding:8px;font-size:13px;font-weight:700;cursor:pointer;text-align:left;color:#14212b;font-family:inherit;line-height:1.25}
.c9rg[aria-pressed=true]{background:#0f3a5a;color:#fff;border-color:#0f3a5a}
.c9prod{display:flex;gap:10px;align-items:center;margin:8px 0}
.c9prod svg{width:96px;height:auto;flex:none}
.c9tag{display:inline-block;font-size:11.5px;font-weight:800;border-radius:8px;padding:2px 8px;color:#fff;background:#6a1b9a;margin-right:4px}
.c9tgt{font-size:15px;font-weight:800;color:#6a1b9a;margin:6px 0}