:root{--ink:#1d2a24;--muted:#5b6b63;--bg:#fbfaf6;--card:#fff;--line:#e3e0d6;--accent:#1f6f4a;--accent2:#e9f3ec}
*{box-sizing:border-box}body{margin:0;font:17px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--ink);background:var(--bg)}
.wrap{max-width:980px;margin:0 auto;padding:0 20px}a{color:var(--accent)}
.nav{display:flex;justify-content:space-between;align-items:center;padding:18px 0;border-bottom:1px solid var(--line)}
.logo{font-weight:700;text-decoration:none;color:var(--ink);font-size:1.15rem}.nav nav a{margin-left:18px;text-decoration:none}
h1{font-size:2.1rem;line-height:1.2;margin:.6em 0 .3em}h2{margin-top:1.8em;font-size:1.4rem}
.lead{font-size:1.15rem;color:var(--muted)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px;margin:24px 0}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden;display:flex;flex-direction:column}
.card img{width:100%;height:auto;display:block;border-bottom:1px solid var(--line)}.card .in{padding:16px;flex:1;display:flex;flex-direction:column}
.card h3{margin:0 0 6px;font-size:1.1rem}.card p{margin:0 0 12px;color:var(--muted);font-size:.95rem;flex:1}
.btn{display:inline-block;background:var(--accent);color:#fff!important;padding:9px 16px;border-radius:8px;text-decoration:none;font-weight:600}
.article{max-width:720px;margin:0 auto}.meta{color:var(--muted);font-size:.9rem}
code{background:#f0eee6;padding:1px 5px;border-radius:4px;font-size:.92em}pre{background:#f0eee6;padding:14px;border-radius:8px;overflow:auto}
.calc{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px;margin:24px 0}
.calc label{display:block;font-weight:600;font-size:.95rem;margin-top:12px}.calc input{width:100%;padding:8px 10px;font:inherit;border:1px solid var(--line);border-radius:6px}
.calc .row{display:grid;grid-template-columns:1fr 1fr;gap:14px}.out{background:var(--accent2);border-radius:10px;padding:16px;margin-top:18px}
.out strong{font-size:1.5rem}.note{font-size:.9rem;color:var(--muted)}
table{border-collapse:collapse;width:100%;margin:12px 0}td,th{border:1px solid var(--line);padding:7px 10px;text-align:left}
.cta{background:var(--accent2);border-radius:12px;padding:18px 20px;margin:28px 0}
footer{border-top:1px solid var(--line);margin-top:48px;padding:20px 0;color:var(--muted);font-size:.9rem}
@media(max-width:600px){.calc .row{grid-template-columns:1fr}h1{font-size:1.7rem}}