@font-face{font-family:Noto Sans Lao;font-style:normal;font-display:swap;font-weight:400;src:url(./noto-sans-lao-lao-400-normal-CNKshTz3.woff2)format("woff2"),url(./noto-sans-lao-lao-400-normal-DjxqBYpY.woff)format("woff")}@font-face{font-family:Noto Sans Lao;font-style:normal;font-display:swap;font-weight:500;src:url(./noto-sans-lao-lao-500-normal-cGCoX3Zg.woff2)format("woff2"),url(./noto-sans-lao-lao-500-normal-PbFcAkjl.woff)format("woff")}@font-face{font-family:Noto Sans Lao;font-style:normal;font-display:swap;font-weight:700;src:url(./noto-sans-lao-lao-700-normal-nTQCf4Ae.woff2)format("woff2"),url(./noto-sans-lao-lao-700-normal-Vt5iUzXy.woff)format("woff")}@font-face{font-family:Noto Sans Lao;font-style:normal;font-display:swap;font-weight:400;src:url(./noto-sans-lao-latin-400-normal-Dumpcsbb.woff2)format("woff2"),url(./noto-sans-lao-latin-400-normal-CljpFdXI.woff)format("woff")}@font-face{font-family:Noto Sans Lao;font-style:normal;font-display:swap;font-weight:500;src:url(./noto-sans-lao-latin-500-normal-CtEyPuH0.woff2)format("woff2"),url(./noto-sans-lao-latin-500-normal-CUAIci31.woff)format("woff")}@font-face{font-family:Noto Sans Lao;font-style:normal;font-display:swap;font-weight:700;src:url(./noto-sans-lao-latin-700-normal-MiFNiZ43.woff2)format("woff2"),url(./noto-sans-lao-latin-700-normal-Czr7sIaL.woff)format("woff")}:root{--bg:#eef2f6;--surface:#fff;--ink:#0f1d2b;--muted:#4a5a68;--line:#d3dce5;--brand:#0a6c8f;--brand-dark:#07506b;--stage-1:#0b1b2b;--stage-2:#15395a;--accent:#ffb74d;--focus:#ff9800;--radius:16px;color:var(--ink);background:var(--bg);font-family:Noto Sans Lao,system-ui,-apple-system,Segoe UI,sans-serif}*{box-sizing:border-box}html,body,#root{min-height:100%;margin:0}body{background:var(--bg);font-size:16px;line-height:1.75}h1,h2,h3,p,ul,ol{margin:0}button,select{font:inherit;color:inherit}:focus-visible{outline:3px solid var(--focus);outline-offset:2px}.faint{color:var(--muted)}.btn{border:1.5px solid var(--line);background:var(--surface);cursor:pointer;white-space:nowrap;border-radius:12px;align-items:center;gap:6px;min-height:44px;padding:6px 16px;font-weight:500;display:inline-flex}.btn:disabled{opacity:.4;cursor:default}.btn-primary{background:var(--brand);border-color:var(--brand);color:#fff}.btn-primary:hover:not(:disabled){background:var(--brand-dark)}.btn-ghost:hover:not(:disabled){background:#e3eaf1}.btn-lang{justify-content:center;min-width:64px;font-weight:700}.btn-tool{color:#e8f1f8;background:#0b1b2bb3;border-color:#ffffff40;min-height:38px;font-size:.9rem}.btn-tool.on{border-color:var(--accent);color:var(--accent)}.chip{color:var(--brand-dark);background:#dff1f8;border-radius:999px;margin-left:8px;padding:0 10px;font-size:.85rem;font-weight:500;line-height:1.7;display:inline-block}.header{z-index:20;background:var(--surface);border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:12px;padding:8px 16px;display:flex;position:sticky;top:0}.brand{cursor:pointer;background:0 0;border:0;align-items:center;gap:10px;padding:4px;font-size:1.15rem;font-weight:700;display:flex}.home{max-width:1100px;margin:0 auto;padding:32px 16px 56px}.hero{color:#fff;background:radial-gradient(ellipse at 80% 20%, #1e5a86, transparent 60%), linear-gradient(135deg, var(--stage-1), var(--stage-2));border-radius:24px;padding:36px 28px}.hero h1{font-size:clamp(1.9rem,4vw,2.8rem);line-height:1.3}.hero p{color:#cfe2f0;margin-top:8px;font-size:1.1rem}.pick{margin:32px 0 14px;font-size:1.25rem}.cards{grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px;display:grid}.card{border-radius:var(--radius);background:var(--surface);border:1px solid var(--line);border-top:6px solid var(--c);flex-direction:column;gap:8px;padding:20px;display:flex}.card.soon{opacity:.6}.card-top{align-items:center;gap:10px;display:flex}.card-top h3{font-size:1.35rem}.swatch{background:var(--c);border-radius:50%;width:14px;height:14px}.card .btn{align-self:flex-start;margin-top:6px}.card-topic .chip{margin:0 6px 0 0}.lesson-wrap{flex-direction:column;min-height:calc(100vh - 61px);display:flex}.lesson-bar{flex-wrap:wrap;align-items:center;gap:12px;width:100%;max-width:1500px;margin:0 auto;padding:10px 16px 0;display:flex}.lesson-title{flex:200px;font-size:1.3rem}.bar-actions{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.seg{border:1.5px solid var(--line);background:var(--surface);border-radius:12px;display:inline-flex;overflow:hidden}.seg button{cursor:pointer;background:0 0;border:0;min-height:44px;padding:4px 18px;font-weight:500}.seg button.on{background:var(--brand);color:#fff}.lesson-wrap[data-stage=bohr]{--ctl:235px}.lesson{flex:1;grid-template-columns:minmax(0,1.75fr) minmax(320px,1fr);gap:16px;width:100%;max-width:1500px;margin:0 auto;padding:12px 16px;display:grid}.stage-col{flex-direction:column;gap:12px;min-width:0;display:flex}.stage{height:clamp(340px, calc(100vh - 250px - var(--ctl,90px)), 760px);border-radius:var(--radius);background:radial-gradient(ellipse at 50% 40%, var(--stage-2), var(--stage-1) 75%);position:relative;overflow:hidden;box-shadow:0 6px 24px #0b1b2b40}.stage canvas{touch-action:none;display:block}.stage-badge{color:#fff;pointer-events:none;flex-direction:column;line-height:1.35;display:flex;position:absolute;top:14px;left:16px}.stage-badge .year{color:var(--accent);font-size:clamp(2rem,4vw,3rem);font-weight:700}.stage-badge .who{font-size:1.15rem;font-weight:700}.stage-badge .model{color:#cfe2f0}.stage-tools{flex-wrap:wrap;justify-content:flex-end;gap:8px;display:flex;position:absolute;top:14px;right:14px}.legend{color:#e8f1f8;background:#0b1b2ba6;border-radius:12px;flex-wrap:wrap;gap:4px 14px;max-width:70%;padding:6px 12px;font-size:.88rem;list-style:none;display:flex;position:absolute;bottom:12px;left:14px}.legend li{align-items:center;gap:6px;display:flex}.legend i{border-radius:50%;width:12px;height:12px;display:inline-block}.stage-hint{color:#a9c2d6;text-align:right;max-width:40%;font-size:.8rem;line-height:1.5;position:absolute;bottom:12px;right:14px}.webgl-fail{color:#fff;text-align:center;place-items:center;padding:24px;font-size:1.1rem;display:grid;position:absolute;inset:0}.controls{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:12px 16px}.ctl-row{flex-wrap:wrap;align-items:center;gap:8px 18px;display:flex}.eq{letter-spacing:.02em;font-size:1.25rem;font-weight:700}.count{font-weight:500}.note{color:var(--muted)}.bohr-ctl{flex-direction:column;gap:12px;display:flex}.el-strip{grid-template-columns:repeat(18,minmax(0,1fr));gap:4px;display:grid}@media (width<=960px){.el-strip{grid-template-columns:repeat(9,minmax(0,1fr))}}.el{border:1.5px solid var(--line);cursor:pointer;background:#f7fafc;border-radius:10px;min-height:48px;padding:15px 0 3px;font-size:.98rem;font-weight:700;line-height:1.2;position:relative}.el small{color:var(--muted);font-size:.65rem;font-weight:500;position:absolute;top:1px;left:5px}.el.on{background:var(--brand);border-color:var(--brand);color:#fff}.el.on small{color:#d3edf7}.bohr-row{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));align-items:start;gap:14px;display:grid}.el-card{align-items:center;gap:12px;display:flex}.el-sym{background:var(--stage-1);color:#fff;border-radius:14px;flex:none;place-items:center;width:84px;height:84px;display:grid;position:relative}.el-sym b{font-size:2.2rem;line-height:1}.el-sym small{color:#9fc2dc;font-size:.8rem;position:absolute}.el-sym small:first-child{top:6px;left:9px}.el-sym small:last-child{bottom:6px;left:9px}.el-facts{flex-direction:column;font-size:.92rem;line-height:1.55;display:flex}.dot{border-radius:50%;width:10px;height:10px;margin:0 4px 0 8px;display:inline-block}.dot:first-child{margin-left:0}.dot.big{vertical-align:middle;border:1px solid #0003;width:14px;height:14px;margin:0 8px 0 0}.excite{flex-direction:column;align-items:flex-start;gap:10px;display:flex}.sel-row{flex-wrap:wrap;gap:12px;display:flex}.sel-row label{align-items:center;gap:6px;font-size:.92rem;display:flex}.sel-row select{border:1.5px solid var(--line);background:#fff;border-radius:10px;min-height:40px;padding:0 8px}.log{flex-direction:column;gap:2px;min-height:60px;font-size:.9rem;display:flex}.log-item{line-height:1.5}.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}.tabs{border-bottom:1px solid var(--line);background:#f4f7fa;display:flex}.tabs button{cursor:pointer;background:0 0;border:0;border-bottom:3px solid #0000;flex:1;min-height:46px;font-weight:500}.tabs 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14px}.pt-legend-title{align-items:center;gap:10px;margin-bottom:8px;font-size:1rem;display:flex}.pt-clear{min-height:34px;padding:0 12px}.pt-legend ul{grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:8px;margin:0;padding:0;list-style:none;display:grid}.pt-key{text-align:left;border:1.5px solid var(--line);background:var(--surface);cursor:pointer;border-radius:12px;align-items:flex-start;gap:10px;width:100%;padding:8px 10px;line-height:1.5;display:flex}.pt-key.on{border-color:var(--brand);box-shadow:0 0 0 2px var(--brand)}.pt-key i{border:1px solid #0f1d2b59;border-radius:6px;flex:none;width:22px;height:22px;margin-top:4px}.pt-key small{color:var(--muted);font-size:.85rem;display:block}.pt-scroll{padding-bottom:8px;overflow-x:auto}.pt-grid{grid-template-rows:repeat(7,auto) 14px repeat(2,auto);grid-template-columns:repeat(18,minmax(58px,1fr));gap:4px;min-width:1100px;display:grid}.pt-cell{min-height:72px;color:var(--ink);cursor:pointer;border:1px solid #0f1d2b59;border-radius:8px;flex-direction:column;align-items:center;padding:2px 2px 4px;line-height:1.15;transition:opacity .15s,transform .1s;display:flex}.pt-cell:hover{z-index:2;transform:scale(1.08);box-shadow:0 4px 14px #0b1b2b59}.pt-cell.dim{opacity:.18}.pt-z{align-self:flex-start;margin-left:4px;font-size:.72rem;font-weight:500}.pt-sym{font-size:1.35rem;font-weight:700}.pt-name{text-overflow:ellipsis;white-space:nowrap;max-width:100%;font-size:.68rem;overflow:hidden}.pt-mass{color:#2c3b49;font-size:.66rem}.pt-ph,.pt-fnote{color:var(--ink);border:1px dashed #0f1d2b73;border-radius:8px;justify-content:center;align-items:center;font-size:.78rem;display:flex}.pt-fnote{border:0;justify-content:flex-start;padding-left:4px;font-weight:700}.pt-hint{margin-top:8px;font-size:.9rem}.pt-overlay{z-index:50;background:#0b1b2b99;justify-content:center;align-items:center;padding:16px;display:flex;position:fixed;inset:0}.pt-dialog{background:var(--surface);border-radius:20px;flex-direction:column;gap:16px;width:min(760px,100%);max-height:100%;padding:20px;display:flex;overflow:auto}.pt-dialog-head{align-items:center;gap:16px;display:flex}.pt-title{flex:1}.pt-title h2{font-size:1.8rem;line-height:1.2}.pt-big{width:110px;color:var(--ink);border:2px solid #0f1d2b80;border-radius:14px;flex-direction:column;align-items:center;padding:6px;line-height:1.2;display:flex}.pt-big-z{align-self:flex-start;font-weight:700}.pt-big-sym{font-size:2.8rem;font-weight:700}.pt-big-mass{font-size:.85rem}.pt-dialog-body{grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px;display:grid}.pt-facts{grid-template-columns:auto 1fr;align-content:start;gap:4px 14px;margin:0;display:grid}.pt-facts dt{color:var(--muted)}.pt-facts dd{margin:0;font-weight:700}.dot{vertical-align:middle;border:1px solid #0f1d2b66;border-radius:4px;width:14px;height:14px;display:inline-block}.pt-atom{flex-direction:column;gap:6px;display:flex}.shell-svg{align-self:center;width:100%;max-width:240px}.pt-dialog-foot{justify-content:space-between;gap:8px;display:flex}@media (width<=560px){.pt-dialog-head{flex-wrap:wrap}}.pt-stage{border-radius:var(--radius);background:radial-gradient(ellipse at 50% 40%, var(--stage-2), var(--stage-1) 75%);height:300px;position:relative;overflow:hidden}.pt-stage canvas{touch-action:none;display:block}.pt-stage-tools{flex-wrap:wrap;justify-content:flex-end;gap:6px;display:flex;position:absolute;top:8px;right:8px}.pt-stage-hint{color:#cfe2f0;pointer-events:none;margin:0;font-size:.8rem;position:absolute;bottom:6px;left:10px}.pt-mini-legend{flex-wrap:wrap;gap:4px 14px;margin:0;padding:0;font-size:.9rem;list-style:none;display:flex}.pt-mini-legend i{border-radius:50%;width:12px;height:12px;margin-right:4px;display:inline-block}.pt-legend ul{grid-auto-rows:1fr}.pt-legend li{display:flex}.pt-legend .pt-key{height:100%}.header-right{align-items:center;gap:10px;display:flex}.logo-badge,.corner-logo{border:1px solid var(--line);cursor:pointer;background:#070707;border-radius:10px;padding:0;line-height:0;overflow:hidden}.logo-badge img{width:44px;height:44px;display:block}.corner-logo{z-index:30;opacity:.75;display:none;position:fixed;bottom:12px;right:12px}.corner-logo img{width:56px;height:56px;display:block}.app:has(.present) .corner-logo{display:block}.about{max-width:800px;margin:0 auto;padding:16px 16px 56px}.about-card{background:var(--surface);border:1px solid var(--line);border-radius:20px;flex-wrap:wrap;align-items:center;gap:24px;margin-top:16px;padding:20px;display:flex}.about-logo{border-radius:16px;max-width:100%;height:auto}.about-slogan{color:var(--brand-dark);margin-bottom:6px;font-weight:700}.about-links{gap:10px;margin:12px 0 0;padding:0;list-style:none;display:grid}.about-links .btn{color:var(--ink);gap:12px;width:100%;text-decoration:none}.pt-overlay.full{padding:0}.pt-overlay.full .pt-dialog{border-radius:0;width:100%;height:100%;max-height:none;padding:24px 32px}.pt-overlay.full .pt-dialog-body{flex:1;grid-template-columns:minmax(300px,.8fr) minmax(0,1.4fr);min-height:0;font-size:1.25rem}.pt-overlay.full .pt-stage{height:min(62vh,640px)}.pt-overlay.full .pt-title h2{font-size:2.6rem}.pt-overlay.full .pt-big{width:150px}.pt-overlay.full .pt-big-sym{font-size:4rem}.pt-overlay.full .pt-mini-legend{font-size:1.1rem}.pt-overlay.full .pt-stage-hint{font-size:1rem}.m2-controls{flex-direction:column;gap:12px;display:flex}.m2-grid{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));align-items:end;gap:12px 20px;display:grid}.m2-slider{flex-direction:column;gap:4px;display:flex}.m2-slider input[type=range]{width:100%;min-height:32px;accent-color:var(--brand)}.m2-slider select{border:1.5px solid var(--line);background:var(--surface);border-radius:12px;min-height:44px;padding:4px 10px}.m2-result{background:var(--surface);border:1px solid var(--line);border-radius:12px;flex-direction:column;gap:4px;padding:10px 14px;display:flex}.webgl-fail{color:#fff;justify-content:center;align-items:center;height:100%;padding:24px;display:flex}.grade-hero{margin-top:12px;padding:24px 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