:root{--bg:#0b1020;--card:#121a2f;--text:#e8ecff;--muted:#aab3d1;--line:#273252;--accent:#5b8cff;--green:#b7ff3c;--warn:#ffe39a}
*{box-sizing:border-box}
body{margin:0;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;background:linear-gradient(180deg,#0b1020,#0f1630);color:var(--text)}
a{color:#a9c5ff}
.wrap{max-width:1020px;margin:0 auto;padding:20px}
.site-head{display:flex;justify-content:space-between;align-items:center;gap:18px;flex-wrap:wrap;margin-bottom:18px}
.site-head img{width:220px;max-width:55vw;height:auto;display:block}
.site-nav{display:flex;gap:14px;flex-wrap:wrap}.site-nav a{text-decoration:none;font-weight:700}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px;margin:16px 0}
.hero{padding:28px}.hero h1{font-size:clamp(30px,5vw,48px);line-height:1.08;margin:0 0 14px}
h2{font-size:clamp(22px,3vw,30px);margin:0 0 12px}h3{font-size:20px;margin:22px 0 10px}
p,li{line-height:1.75}.lede{font-size:18px;color:#dbe4ff}.muted,.small{color:var(--muted)}.small{font-size:13px}
.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}
.tile{display:block;background:#0f1630;border:1px solid var(--line);border-radius:12px;padding:16px;text-decoration:none;color:var(--text)}
.tile:hover{border-color:#5b8cff}.tile strong{display:block;font-size:18px;margin-bottom:7px}.tile span{color:var(--muted);line-height:1.55}
.note{padding:15px;border:1px solid #35508c;border-radius:12px;background:#0f1630;line-height:1.65}
.warning{border-color:#806d36;color:#fff2c8}.formula{font:600 16px ui-monospace,SFMono-Regular,Menlo,monospace;overflow-wrap:anywhere;color:#dbe6ff}
.btn{display:inline-block;background:var(--accent);color:#fff;text-decoration:none;border-radius:10px;padding:12px 18px;font-weight:800;margin:4px 8px 4px 0}
.btn.secondary{background:#263960}.crumbs{font-size:13px;color:var(--muted);margin-bottom:14px}.crumbs a{color:#b8cbff}
.byline{font-size:13px;color:var(--muted);margin-top:10px}.checklist li{margin-bottom:8px}
.field label{display:block;color:var(--muted);font-size:13px;margin-bottom:6px}.field input,.field select{width:100%;padding:12px;border:1px solid #35508c;border-radius:9px;background:#0b1020;color:#fff;font-size:16px}
.result{background:#0f1630;border:1px solid var(--line);border-radius:12px;padding:16px;margin-top:16px}.result-main{font-size:30px;font-weight:900;color:var(--green)}
.result-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-top:12px}.result-box{background:#111a31;border:1px solid var(--line);border-radius:10px;padding:12px}.result-box b{display:block;font-size:19px;margin-top:5px}
.toggle{display:flex;gap:8px;margin:12px 0}.toggle button{border:1px solid #35508c;background:#203155;color:#fff;padding:9px 13px;border-radius:9px;cursor:pointer;font-weight:700}.toggle button.active{background:#5b8cff}
.metric{background:#0f1630;border:1px solid var(--line);border-radius:12px;padding:16px}.metric .value{font-size:30px;font-weight:900;color:var(--green)}
.bar{height:10px;background:#202b48;border-radius:99px;overflow:hidden;margin-top:8px}.bar span{display:block;height:100%;background:#5b8cff}
.site-footer{margin:26px 0 10px;padding-top:18px;border-top:1px solid var(--line);color:var(--muted);font-size:13px;line-height:1.7}.site-footer nav{display:flex;gap:13px;flex-wrap:wrap;margin-bottom:10px}
@media(max-width:720px){.grid,.grid.three,.result-grid{grid-template-columns:1fr}.hero{padding:22px}.card{padding:18px}.site-nav{gap:10px}.site-head{align-items:flex-start}}