:root{--navy:#1E2B4A;--orange:#CC4A28;--gold:#C4A058;--cream:#F2F0EC;--ink:#14213D;--muted:#6B6560;--surface:#FFFFFF;--border:#D8D5CE;--bg:#F2F0EC}
@media (prefers-color-scheme:dark){:root{--bg:#101828;--surface:#18233A;--ink:#EDEAE4;--muted:#A9A39B;--border:#2A3756;--navy:#EDEAE4;--cream:#18233A}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 -apple-system,Segoe UI,Roboto,Arial,sans-serif}
a{color:var(--orange)}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
.top{border-bottom:1px solid var(--border);background:var(--surface)}
.nav{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;padding:14px 20px}
.brand{font-weight:800;font-size:20px;color:var(--navy);text-decoration:none}
.brand span{color:var(--orange)}
nav a{margin-left:18px;color:var(--ink);text-decoration:none;font-weight:600;font-size:15px}
nav a:hover{color:var(--orange)}
.hero{padding:48px 0 16px}
.hero h1{font-size:clamp(28px,4vw,42px);line-height:1.15;color:var(--navy);margin:0 0 12px}
.hero p{font-size:18px;max-width:760px;color:var(--muted)}
#q{width:100%;max-width:560px;padding:14px 16px;font-size:16px;border:1px solid var(--border);border-radius:10px;background:var(--surface);color:var(--ink);margin-top:8px}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0}
.chip{border:1px solid var(--border);background:var(--surface);color:var(--ink);padding:7px 14px;border-radius:999px;cursor:pointer;font-size:14px}
.chip.on{background:var(--orange);border-color:var(--orange);color:#fff}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px;margin-bottom:40px}
.card{display:block;background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:20px;text-decoration:none;color:var(--ink);transition:transform .15s,box-shadow .15s}
.card:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,.08)}
.card h3{margin:10px 0 6px;color:var(--navy);font-size:19px;line-height:1.3}
.card p{margin:0;color:var(--muted);font-size:15px}
.meta{display:flex;justify-content:space-between;align-items:center;gap:8px;flex-wrap:wrap}
.cat{font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--gold)}
.badge{font-size:12px;font-weight:700;padding:3px 9px;border-radius:999px;white-space:nowrap}
.b-doc{background:#E7F0E4;color:#2F5D2A}.b-res{background:#E3ECF8;color:#1F4A86}.b-tool{background:#F4ECDD;color:#7A5A1C}
.b-vend{background:#F8E4DD;color:#8A3218}.b-how{background:#ECEAE6;color:#4F4A45}
.legend ul,.calc ul{padding-left:20px}.legend li{margin:8px 0}
.cta,.signup,.calc{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:24px;margin:24px 0}
.cta h2,.signup h2,.calc h2,.legend h2,.entry h2{color:var(--navy);margin-top:0}
.btn{display:inline-block;background:var(--orange);color:#fff;padding:12px 20px;border-radius:10px;text-decoration:none;font-weight:700;border:0;cursor:pointer;font-size:15px}
.btn.small{padding:8px 14px;font-size:14px}
.entry{max-width:760px;padding:24px 0}
.entry h1{color:var(--navy);font-size:clamp(26px,3.6vw,38px);line-height:1.2;margin:12px 0}
.entry h2{font-size:20px;margin:28px 0 8px}
.lede{font-size:19px;color:var(--muted)}
.crumb{margin-top:24px;font-size:14px;color:var(--muted)}.crumb a{color:var(--muted)}
.prompt{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:16px}
.prompt pre{white-space:pre-wrap;font:15px/1.6 ui-monospace,Consolas,monospace;margin:0 0 12px}
.caution{margin-top:20px;padding:14px 16px;border-radius:10px;background:#FBF3E6;color:#5C4210;border:1px solid #EAD7B0}
@media (prefers-color-scheme:dark){.caution{background:#2B2414;color:#EAD7B0;border-color:#4A3C1E}}
.sources li{margin:6px 0}
.calc label{display:block;margin:10px 0;font-weight:600}
.calc input{display:block;margin-top:4px;width:100%;max-width:280px;padding:10px 12px;font-size:16px;border:1px solid var(--border);border-radius:8px;background:var(--bg);color:var(--ink)}
.out{font-size:19px;font-weight:700;color:var(--orange)}
.muted{color:var(--muted)}
.foot{border-top:1px solid var(--border);margin-top:40px;padding:24px 0;font-size:14px;color:var(--muted)}
@media (max-width:600px){nav a{margin:0 14px 0 0}}