/* Palettes — selectable via data-theme on . Every theme defines the same tokens. */
:root,[data-theme=slate]{--bg:#f7f8fa;--fg:#1c2330;--muted:#5b6575;--brand:#1f3a5f;--brand2:#2f6fb2;--accent:#c8973a;--card:#fff;--line:#e2e6ec;--band:#1f3a5f;--band-fg:#fff}
[data-theme=forest]{--bg:#f6f8f5;--fg:#1d2a22;--muted:#5a6a60;--brand:#22503b;--brand2:#3f8a63;--accent:#d3a44a;--card:#fff;--line:#dde5df;--band:#22503b;--band-fg:#fff}
[data-theme=plum]{--bg:#faf7fa;--fg:#2a1f2e;--muted:#6a5c70;--brand:#4b2a5a;--brand2:#7d4f96;--accent:#d69a3b;--card:#fff;--line:#e8dfeb;--band:#4b2a5a;--band-fg:#fff}
[data-theme=warm]{--bg:#fbf8f3;--fg:#2b2520;--muted:#6d6259;--brand:#7a3b1e;--brand2:#b8612f;--accent:#2f6fb2;--card:#fff;--line:#ebe3d8;--band:#7a3b1e;--band-fg:#fff}
[data-theme=ink]{--bg:#111418;--fg:#e8ebef;--muted:#a2abb7;--brand:#e8ebef;--brand2:#6fb1ff;--accent:#e3b04b;--card:#1a1f26;--line:#2a313b;--band:#1a1f26;--band-fg:#e8ebef}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font:16px/1.6 -apple-system,"Segoe UI",Inter,Roboto,sans-serif;color:var(--fg);background:var(--bg)}
a{color:var(--brand2);text-decoration:none}a:hover{text-decoration:underline}
h1,h2,h3,h4{font-family:Georgia,"Times New Roman",serif;line-height:1.2;margin:.2em 0 .5em;color:var(--brand)}
h1{font-size:clamp(2rem,4vw,3rem)}h2{font-size:1.8rem}h3{font-size:1.2rem}
.wrap{max-width:1100px;margin:0 auto;padding:0 20px}
.top{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}
.top .wrap{display:flex;align-items:center;gap:24px;height:72px}
.brand{display:flex;align-items:center;gap:10px;color:var(--brand);font-family:Georgia,serif;font-size:1.25rem;line-height:1.1}
.brand b{color:var(--brand2)}.brand small{display:block;font:11px sans-serif;color:var(--muted);letter-spacing:.06em;text-transform:uppercase}
.mark{background:var(--brand);color:#fff;font:bold 15px sans-serif;width:38px;height:38px;border-radius:8px;display:grid;place-items:center}
nav{display:flex;gap:22px;margin-left:auto}nav a{color:var(--fg);font-weight:500}
.burger{display:none;background:none;border:0;font-size:1.6rem;color:var(--brand)}
.hero{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;padding:80px 0}
.hero h1,.hero .lede{color:#fff}.hero.small{padding:48px 0}
.lede{font-size:1.25rem;color:var(--muted);max-width:60ch}
.cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}
.btn{display:inline-block;background:var(--accent);color:#1c1c1c;font-weight:700;padding:12px 22px;border-radius:6px;border:0;cursor:pointer}
.btn.ghost{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.7)}
.btn:hover{text-decoration:none;filter:brightness(1.08)}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:18px;padding:48px 0}
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:22px;color:var(--fg);display:block;transition:transform .15s,box-shadow .15s}
.card:hover{transform:translateY(-3px);box-shadow:0 8px 24px rgba(0,0,0,.08);text-decoration:none}
.card p{color:var(--muted);margin:0;font-size:.95rem}.card .ico{font-size:1.8rem}.card .link{color:var(--brand2);font-weight:600}
.band{background:var(--band);color:var(--band-fg);padding:56px 0}.band h2,.band h3,.band .lede{color:var(--band-fg)}.band p{color:var(--band-fg);opacity:.9}
.band.alt{background:var(--card);color:var(--fg);border-top:1px solid var(--line);border-bottom:1px solid var(--line);text-align:center}
.band.alt h2{color:var(--brand)}.band.alt .lede{color:var(--muted);margin:0 auto 20px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}
.tools{padding:48px 20px}.article{padding:40px 20px;max-width:760px}
.form label{display:block;margin:14px 0;font-weight:600}.form input,.form textarea{display:block;width:100%;padding:10px;border:1px solid var(--line);border-radius:6px;font:inherit;background:var(--card);color:var(--fg)}
footer{background:var(--card);border-top:1px solid var(--line);padding:40px 0 20px;margin-top:40px;font-size:.95rem}
footer h4{margin-top:0}.fine{font-size:.8rem;color:var(--muted)}
.themes{position:fixed;right:14px;bottom:14px;display:flex;gap:6px;background:var(--card);border:1px solid var(--line);padding:6px;border-radius:999px;box-shadow:0 4px 16px rgba(0,0,0,.12)}
.themes button{width:22px;height:22px;border-radius:50%;border:2px solid transparent;cursor:pointer}
.themes button[aria-pressed=true]{border-color:var(--fg)}
@media(max-width:820px){.grid3{grid-template-columns:1fr}nav{display:none}.burger{display:block;margin-left:auto}
body.nav-open nav{display:flex;flex-direction:column;position:absolute;top:72px;left:0;right:0;background:var(--card);padding:16px 20px;border-bottom:1px solid var(--line)}}
/* About */
.about .headshot{float:right;width:240px;height:auto;border-radius:12px;margin:0 0 1rem 1.5rem;object-fit:cover}
@media(max-width:640px){.about .headshot{float:none;display:block;width:180px;margin:0 auto 1rem}}
/* honeypot: invisible to people, present for bots */
.form .hp{position:absolute;left:-10000px;width:1px;height:1px;overflow:hidden}
/* Calculators */
.author{display:flex;gap:16px;align-items:flex-start;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:18px;margin-top:36px}.author img{width:64px;height:auto;border-radius:8px;flex:none}.author p{margin:0 0 .5em}.author p:last-child{margin:0}
.notice{background:var(--card);border-left:5px solid var(--accent);padding:14px 18px;border-radius:6px;margin:18px 0}
.cs-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
@media(max-width:640px){.cs-grid{grid-template-columns:1fr}}
.cs-form fieldset{border:1px solid var(--line);border-radius:8px;padding:6px 16px 12px;margin:14px 0}
.cs-form legend{font-weight:700;padding:0 6px}
.cs-form label.radio{font-weight:500;display:flex;gap:10px;align-items:center;margin:8px 0}
.cs-form label.radio input{width:auto;display:inline}
.cs-form select{display:block;padding:10px;border:1px solid var(--line);border-radius:6px;font:inherit;background:var(--card);color:var(--fg)}
.cs-out{margin-top:24px}
.cs-headline{font-size:1.35rem;margin:12px 0 16px}
.cs-sheet{width:100%;border-collapse:collapse;font-size:.95rem}
.cs-sheet td{padding:8px 6px;border-bottom:1px solid var(--line);vertical-align:top}
.cs-sheet td.num{text-align:right;white-space:nowrap;font-variant-numeric:tabular-nums}
.cs-sheet .cite{color:var(--muted,#777);font-size:.85em;white-space:nowrap}