:root{font-family:system-ui,-apple-system,"Segoe UI",sans-serif;color:#1c2942;background:#f4f7fc;--ink:#1c2942;--muted:#52647e;--line:#d6dfed;--violet:#7357bb;--blue:#1677b9;--gold:#ad660a;--good:#146b54}
*{box-sizing:border-box}body{margin:0;line-height:1.55}a{color:#155e9b}button,input{font:inherit}button{cursor:pointer}button:focus-visible,input:focus-visible{outline:3px solid #f2b851;outline-offset:2px}header{padding:28px max(18px,calc((100% - 1170px)/2));background:linear-gradient(115deg,#283b66,#6755a4);color:white}header h1{font-size:clamp(1.5rem,3.8vw,2.45rem);margin:.3rem 0}header p{max-width:790px;margin:0;color:#f1edff}.eyebrow{font-weight:800;letter-spacing:.1em;text-transform:uppercase;font-size:.74rem;color:#dddaff}main{max-width:1170px;margin:0 auto;padding:24px 18px 50px}.notice{border-left:4px solid #b38a26;background:#fff7e7;border-radius:9px;padding:12px 17px;margin-bottom:20px}.layout{display:grid;grid-template-columns:minmax(280px,365px) minmax(0,1fr);gap:18px;align-items:start}.panel{background:white;border:1px solid var(--line);border-radius:16px;box-shadow:0 4px 22px #1c31500b;padding:20px}.panel h2{font-size:1.2rem;margin:0 0 12px}fieldset{border:0;padding:0;margin:0}legend{font-weight:750;padding:0;margin:0 0 7px}.coord{display:grid;grid-template-columns:74px 1fr 63px;align-items:center;gap:9px;margin:11px 0}.coord span{font-weight:700}.coord input[type=range]{width:100%;accent-color:var(--violet)}.coord input[type=number]{width:100%;padding:6px;border:1px solid #b9c7d9;border-radius:7px}.veca{color:#6046a4}.vecb{color:#126ca9}.small{color:var(--muted);font-size:.89rem}.presetbar{display:flex;flex-wrap:wrap;gap:7px;margin:10px 0 20px}.presetbar button{border:1px solid #c6d2e1;background:#eef3fa;color:#243856;border-radius:999px;padding:6px 10px;font-size:.83rem}.presetbar button:hover{background:#dbe9fb}.tabs{display:flex;gap:7px;flex-wrap:wrap;margin:0 0 17px}.tabs button{border:1px solid #c9d3e4;color:#324569;background:#eaf0fa;border-radius:9px;padding:10px 13px;font-weight:730}.tabs button[aria-selected=true]{background:#57439b;border-color:#57439b;color:white}.view[hidden]{display:none!important}.math{font-family:ui-serif,Georgia,serif;font-size:1.13rem;background:#f3f6fb;border:1px solid #e3e9f2;border-radius:10px;padding:11px;overflow-wrap:anywhere;margin:10px 0}.results{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:9px;margin:12px 0}.metric{border:1px solid #dae3ee;background:#fafcff;border-radius:10px;padding:10px;min-width:0}.metric .label{display:block;font-size:.79rem;color:#5b6882}.metric output{font-weight:780;font-size:1.25rem;overflow-wrap:anywhere}.state{background:#e7f5f0;border:1px solid #bce3d3;border-radius:10px;padding:12px;margin:13px 0;font-weight:650;color:#175e4c}.state.warn{background:#fff2e6;border-color:#f3d1a5;color:#815012}.step{border-left:3px solid #8b76c5;padding-left:12px;margin:13px 0}.step strong{display:block}.actions{display:flex;flex-wrap:wrap;gap:9px}.actions button{background:#604aaa;color:white;border:0;border-radius:8px;padding:8px 12px}.actions button.secondary{background:#eaf1fb;color:#264568;border:1px solid #b8c8e0}.diagram{width:100%;height:auto;max-height:445px;border-radius:11px;background:#f9fbff;border:1px solid #dee6f0;display:block}.diagram .axis{stroke:#8d9db2;stroke-width:1.5}.diagram .gridline{stroke:#e1e8f1;stroke-width:1}.diagram .vectora{stroke:#7357bb;stroke-width:4;stroke-linecap:round}.diagram .vectorb{stroke:#1677b9;stroke-width:4;stroke-linecap:round}.diagram .fill{fill:#bfabea;fill-opacity:.28}.diagram .projection{stroke:#cc8a22;stroke-width:2.5;stroke-dasharray:6 5}.diagram text{font:13px system-ui,sans-serif;fill:#42516c}.figurekey{display:flex;flex-wrap:wrap;gap:14px;font-size:.9rem;margin:7px 0}.figurekey i{display:inline-block;width:18px;height:4px;vertical-align:middle;margin-right:4px}.qwrap{display:grid;grid-template-columns:minmax(0,1fr) 100px;align-items:center;gap:12px;margin:16px 0}.qwrap input[type=range]{width:100%;accent-color:#a96722}.qwrap input[type=number]{width:100%;padding:7px;border:1px solid #b9c7d9;border-radius:7px}#qplot{width:100%;height:auto;border:1px solid #dde5f0;border-radius:9px;background:#fafcff}details{border:1px solid #dbe3ef;border-radius:9px;padding:9px 12px;margin:9px 0}summary{cursor:pointer;font-weight:670}footer{color:#53637b;font-size:.86rem;margin-top:22px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media(max-width:760px){.layout{grid-template-columns:1fr}.results{grid-template-columns:repeat(3,minmax(0,1fr))}.panel{padding:15px}.coord{grid-template-columns:64px 1fr 65px}}@media(max-width:420px){.results{grid-template-columns:1fr}.math{font-size:1.03rem}}