:root{--ink:#202326;--muted:#747b82;--paper:#f4f1e8;--panel:#fffdf8;--line:#ded8ca;--accent:#176bff;--accent2:#dce9ff;--green:#1b7f5a;--red:#a43838;--shadow:0 16px 50px rgba(30,35,42,.07)}
*{box-sizing:border-box} body{margin:0;background:var(--paper);color:var(--ink);font-family:'Space Grotesk',system-ui,sans-serif;min-height:100vh}.topbar{height:76px;background:#16191c;color:#f8f6ef;display:flex;align-items:center;justify-content:space-between;padding:0 5vw}.brand{display:flex;gap:12px;align-items:center}.brand-mark{width:35px;height:35px;border:1px solid #fff3;border-radius:10px;display:grid;place-items:center;font-size:20px}.brand strong{display:block;font-size:14px}.brand small{display:block;color:#aeb5bd;font-size:11px;margin-top:2px}.pill{border:1px solid #fff2;border-radius:999px;padding:7px 11px;font:500 11px 'DM Mono',monospace;color:#cbd2da}.app-shell{width:min(1480px,92vw);margin:0 auto;padding:44px 0 60px}.hero{display:flex;justify-content:space-between;gap:36px;align-items:end;margin-bottom:32px}.eyebrow{font:500 11px 'DM Mono',monospace;letter-spacing:.16em;color:var(--accent);margin:0 0 10px}.hero h1{margin:0;font-size:clamp(37px,5vw,68px);line-height:.98;letter-spacing:-.05em}.hero h1 em{font-style:normal;color:#a17b3a}.hero-copy{max-width:650px;color:var(--muted);line-height:1.6;font-size:15px;margin:18px 0 0}.hero-card{min-width:300px;display:flex;gap:12px;align-items:flex-start;padding:18px 20px;background:#ebe6da;border:1px solid #d6cfbf;border-radius:14px}.hero-card>span{width:25px;height:25px;display:grid;place-items:center;border-radius:50%;background:var(--green);color:white;font-size:13px}.hero-card b{display:block;font-size:13px}.hero-card small{display:block;color:#777;line-height:1.4;margin-top:3px}.workspace{display:grid;grid-template-columns:250px minmax(420px,1fr) minmax(360px,480px);gap:0;background:var(--panel);border:1px solid var(--line);border-radius:18px;overflow:hidden;box-shadow:var(--shadow)}.sidebar,.builder-panel,.result-panel{padding:28px}.sidebar{background:#eeeadf;border-right:1px solid var(--line)}.result-panel{border-left:1px solid var(--line);background:#fbfaf5}.sidebar-label{font:500 10px 'DM Mono',monospace;letter-spacing:.13em;color:#8b8d8f;text-transform:uppercase;margin-bottom:12px}.family-btn{display:flex;align-items:center;gap:10px;border:0;background:transparent;padding:10px 8px;width:100%;border-radius:10px;text-align:left;font:600 13px 'Space Grotesk',sans-serif;color:#535a61;cursor:pointer}.family-btn span{min-width:34px;text-align:center;font:500 10px 'DM Mono',monospace;background:#dfdbd0;border-radius:6px;padding:6px 5px;color:#6c6d6e}.family-btn.active{background:#fffdf8;color:#15181b;box-shadow:0 2px 8px #0000000b}.family-btn.active span{background:var(--accent2);color:var(--accent)}.side-note{margin-top:24px;padding:14px 13px;border-top:1px solid #d4cebf;color:#777;line-height:1.5;font-size:11px}.side-note b{color:#494d50}.side-note code{font-family:'DM Mono',monospace;font-size:10px}.panel-heading{display:flex;justify-content:space-between;align-items:start}.panel-heading h2{margin:0;font-size:27px;letter-spacing:-.03em}.family-tag{font:500 13px 'DM Mono',monospace;background:#f1eee5;padding:8px 10px;border-radius:8px;border:1px solid #ded8ca}.instruction{color:var(--muted);font-size:13px;line-height:1.55;max-width:700px;margin:12px 0 24px}.formula-stage{border:1px dashed #cbc4b6;background:#faf8f0;border-radius:16px;padding:34px 24px;min-height:210px;display:flex;flex-direction:column;justify-content:center}.formula-line{display:flex;align-items:end;justify-content:center;gap:6px;flex-wrap:wrap}.element-wrap{display:flex;flex-direction:column;gap:7px}.element-wrap label{font:500 9px 'DM Mono',monospace;color:#8b8d8f;text-transform:uppercase;letter-spacing:.08em}.element-select{width:116px;height:58px;border-radius:10px;border:1px solid #bdd0ee;background:white;color:#1e4f9d;padding:0 10px;font:600 17px 'Space Grotesk',sans-serif;outline:none}.ion-wrap .element-select{width:170px}.sub-wrap{display:inline-flex;align-items:flex-start;padding-bottom:5px}.sub-select{width:47px;height:35px;border-radius:8px;border:1px solid #d2c9b8;background:#fff;color:#49484a;font:600 13px 'DM Mono',monospace;outline:none}.formula-literal,.formula-group{font-size:39px;font-weight:600;line-height:1;padding:0 3px 7px}.builder-tip{text-align:center;color:#92908a;font-size:11px;margin-top:28px}.builder-tip span{color:var(--accent)}.action-row{display:flex;gap:10px;margin-top:18px}.primary-btn,.ghost-btn{height:44px;border-radius:10px;padding:0 17px;font:600 12px 'Space Grotesk',sans-serif;cursor:pointer}.primary-btn{border:1px solid #0f5be0;background:var(--accent);color:white;box-shadow:0 5px 15px #176bff25}.primary-btn span{margin-left:10px}.ghost-btn{border:1px solid var(--line);background:#fffdf8;color:#4f5459}.message{margin-top:13px;padding:10px 12px;border-radius:9px;font-size:12px;line-height:1.4}.message.error{background:#fbe7e7;color:var(--red);border:1px solid #e7c0c0}.message.info{background:#eaf1ff;color:#25589d;border:1px solid #c8d9f9}.hidden{display:none!important}.result-empty{display:flex;min-height:440px;align-items:center;justify-content:center;flex-direction:column;text-align:center;color:#96938c;padding:20px}.empty-symbol{width:48px;height:48px;border:1px solid #d4cec1;border-radius:12px;display:grid;place-items:center;font-size:20px;color:#a3a098;margin-bottom:15px}.result-empty h3{margin:0;color:#585a5c;font-size:16px}.result-empty p{max-width:250px;font-size:12px;line-height:1.5}.compound-head{padding-bottom:18px;border-bottom:1px solid var(--line)}.compound-head span{display:block;color:#97938a;font:500 9px 'DM Mono',monospace;text-transform:uppercase;letter-spacing:.13em}.compound-head strong{display:block;font-size:43px;letter-spacing:-.04em;margin:7px 0}.compound-head em{font-style:normal;color:var(--accent);font:500 11px 'DM Mono',monospace}.result-section{padding-top:18px}.result-section h3{margin:0 0 10px;font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:#77746e}.names-grid{display:grid;gap:8px}.name-card{border:1px solid var(--line);background:#fffdf9;border-radius:10px;padding:11px 12px}.name-card span{display:block;color:#a3a097;font:500 9px 'DM Mono',monospace;text-transform:uppercase;letter-spacing:.1em;margin-bottom:4px}.name-card strong{font-size:13px}.steps{list-style:none;padding:0;margin:0;display:grid;gap:9px}.steps li{display:grid;grid-template-columns:25px 1fr;gap:9px;align-items:start;font-size:11px;line-height:1.55;color:#565960}.steps li>b{display:grid;place-items:center;width:24px;height:24px;border-radius:7px;background:#ece8dd;font:500 10px 'DM Mono',monospace}.steps li span{padding-top:3px}@media(max-width:1100px){.workspace{grid-template-columns:220px 1fr}.result-panel{grid-column:1/-1;border-left:0;border-top:1px solid var(--line)}.hero-card{display:none}}@media(max-width:760px){.app-shell{width:94vw;padding-top:28px}.topbar{padding:0 3vw}.pill{display:none}.hero{display:block}.workspace{grid-template-columns:1fr}.sidebar{border-right:0;border-bottom:1px solid var(--line)}.builder-panel,.sidebar,.result-panel{padding:22px}.result-panel{grid-column:auto;border-top:0;border-left:0}.formula-stage{min-height:180px}.action-row{flex-wrap:wrap}}