:root{--ink:#1f2a44;--mut:#5b6474;--line:#e5e7eb;--bg:#f8fafc;--acc:#16a34a;--acc2:#2563eb;--warn:#b45309}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;font:17px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:#fff}
a{color:var(--acc2)}a:hover{text-decoration:none}
.wrap{max-width:920px;margin:0 auto;padding:0 20px}
header.site{border-bottom:1px solid var(--line);background:#fff}
header.site .wrap{display:flex;gap:18px;align-items:center;justify-content:space-between;padding-top:12px;padding-bottom:12px;flex-wrap:wrap}
.brand{font-weight:800;color:var(--ink);text-decoration:none;font-size:19px}
nav a{margin-left:16px;color:var(--mut);text-decoration:none;font-size:15px}nav a:hover{color:var(--ink)}
main{padding:28px 0 40px}
h1{font-size:34px;line-height:1.2;margin:.2em 0 .4em}h2{font-size:24px;margin:1.8em 0 .5em}h3{font-size:19px;margin:1.4em 0 .3em}
.lede{font-size:19px;color:#374151}
.crumbs{font-size:14px;color:var(--mut)}.crumbs a{color:var(--mut)}
figure{margin:22px 0;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#fff}
figure img{display:block;width:100%;height:auto}
figcaption{font-size:14px;color:var(--mut);padding:8px 12px;border-top:1px solid var(--line);background:var(--bg)}
.cta{border:2px solid var(--acc);border-radius:12px;padding:18px 20px;margin:26px 0;background:#f0fdf4}
.cta.blue{border-color:var(--acc2);background:#eff6ff}
.cta h3{margin-top:0}
.btn{display:inline-block;background:var(--acc);color:#fff;font-weight:700;text-decoration:none;padding:11px 18px;border-radius:9px;margin:6px 8px 0 0}
.btn.blue{background:var(--acc2)}.btn.ghost{background:#fff;color:var(--ink);border:1px solid #cbd5e1}
.note{font-size:14px;color:var(--mut)}
.todo{display:none}
ol.steps li{margin:.5em 0}
code,pre{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:14px;background:#f1f5f9;border-radius:6px}
code{padding:1px 5px}pre{padding:12px 14px;overflow-x:auto;white-space:pre-wrap}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px;margin:14px 0}
.card{border:1px solid var(--line);border-radius:12px;padding:14px 16px;background:#fff}
.card h3{margin:.1em 0 .3em;font-size:17px}.card p{margin:.2em 0;font-size:15px;color:#374151}
.card a.more{font-weight:600;text-decoration:none}
table.t{border-collapse:collapse;width:100%;font-size:15px;margin:10px 0}table.t th,table.t td{border:1px solid var(--line);padding:7px 9px;text-align:left}table.t th{background:var(--bg)}
details{border:1px solid var(--line);border-radius:10px;padding:10px 14px;margin:8px 0}summary{font-weight:600;cursor:pointer}
footer.site{border-top:1px solid var(--line);background:var(--bg);font-size:14px;color:var(--mut);padding:22px 0 30px}
footer.site a{color:var(--mut)}
/* tools */
.tool{border:1px solid #cbd5e1;border-radius:12px;padding:16px;background:var(--bg);margin:18px 0}
.tool label{display:block;font-size:14px;font-weight:600;margin:8px 0 3px}
.tool input,.tool select{font:inherit;padding:8px 10px;border:1px solid #cbd5e1;border-radius:8px;width:100%;max-width:260px;background:#fff}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:flex-end}.row>div{flex:1;min-width:120px}
.result{margin-top:14px;padding:14px;border-radius:10px;background:#fff;border:1px solid var(--line)}
.big{font-size:30px;font-weight:800;color:var(--acc)}.bad{color:#b91c1c}
.days{display:grid;grid-template-columns:repeat(7,1fr);gap:6px;max-width:420px}
.days label{margin:0;font-weight:500;text-align:center;border:1px solid #cbd5e1;border-radius:8px;padding:6px 0;background:#fff;cursor:pointer;user-select:none}
.days input{display:none}.days label.on{background:var(--acc);color:#fff;border-color:var(--acc)}.days label.off{opacity:.35}
button{font:inherit;padding:8px 14px;border-radius:8px;border:1px solid #cbd5e1;background:#fff;cursor:pointer}
@media(max-width:600px){h1{font-size:28px}nav a{margin-left:10px}}