:root{
  --bg:#fbfaf7;--surface:#ffffff;--ink:#1d2327;--muted:#5b6670;--line:#e4e1da;
  --brand:#0f5c4d;--brand-2:#e9f2ef;--accent:#c7782a;--warn-bg:#fff7e8;
  --radius:10px;--max:760px;--wide:1080px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.65 "Source Sans 3",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
a{color:var(--brand)}
a:hover{text-decoration-thickness:2px}
img{max-width:100%}
h1,h2,h3{font-family:"Source Serif 4",Georgia,serif;line-height:1.25;color:#14201d}
h1{font-size:2.1rem;margin:.2em 0 .4em}
h2{font-size:1.5rem;margin:1.8em 0 .5em}
h3{font-size:1.2rem;margin:1.4em 0 .4em}
.wrap{max-width:var(--wide);margin:0 auto;padding:0 16px}
.narrow{max-width:var(--max);margin:0 auto;padding:0 16px}

/* cabecera */
.site-header{background:var(--surface);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:64px;flex-wrap:wrap}
.logo{font-family:"Source Serif 4",Georgia,serif;font-weight:700;font-size:1.35rem;color:var(--ink);text-decoration:none}
.logo span{color:var(--brand)}
.nav{display:flex;gap:4px 18px;flex-wrap:wrap;font-size:.95rem}
.nav a{color:var(--muted);text-decoration:none;padding:6px 0}
.nav a:hover{color:var(--brand)}

/* portada */
.hero{padding:56px 0 32px}
.hero h1{font-size:2.5rem;max-width:18ch}
.hero p{font-size:1.15rem;color:var(--muted);max-width:56ch}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px;text-decoration:none;color:inherit;display:block;transition:border-color .15s}
.card:hover{border-color:var(--brand)}
.card .cat{font-size:.8rem;text-transform:uppercase;letter-spacing:.06em;color:var(--accent);font-weight:600}
.card h3{margin:.3em 0 .3em;font-size:1.15rem}
.card p{margin:0;color:var(--muted);font-size:.95rem}
.section-title{display:flex;justify-content:space-between;align-items:baseline;margin-top:40px}
.tools{background:var(--brand-2);border-radius:var(--radius);padding:24px;margin:40px 0}
.tools h2{margin-top:0}

/* artículo */
.breadcrumb{font-size:.9rem;color:var(--muted);margin:24px 0 0}
.breadcrumb a{color:var(--muted)}
.meta{color:var(--muted);font-size:.92rem;margin-bottom:1.5em}
article p,article li{max-width:68ch}
article table{border-collapse:collapse;width:100%;margin:1.2em 0;font-size:.95rem;background:var(--surface)}
article th,article td{border:1px solid var(--line);padding:8px 10px;text-align:left;vertical-align:top}
article th{background:var(--brand-2)}
.table-scroll{overflow-x:auto}
.callout{background:var(--brand-2);border-left:4px solid var(--brand);padding:14px 18px;border-radius:6px;margin:1.4em 0}
.callout p{margin:.3em 0}
.disclaimer{background:var(--warn-bg);border:1px solid #f0dfbd;border-radius:var(--radius);padding:14px 18px;font-size:.92rem;color:#5a4a2c;margin:2.5em 0 1em}
.related{border-top:1px solid var(--line);margin-top:2.5em;padding-top:1em}
.related ul{padding-left:1.2em}
.toc{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:12px 20px;margin:1.2em 0;font-size:.95rem}
.toc strong{display:block;margin-bottom:4px}
.toc ol{margin:0;padding-left:1.2em}

/* calculadoras */
.calc{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px;margin:1.5em 0}
.calc .fields{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px}
.calc label{display:block;font-weight:600;font-size:.95rem;margin-bottom:4px}
.calc input,.calc select{width:100%;padding:10px 12px;font:inherit;border:1px solid #cfcac0;border-radius:8px;background:#fff}
.calc input:focus,.calc select:focus{outline:2px solid var(--brand);outline-offset:1px}
.results{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px;margin-top:20px}
.result{background:var(--brand-2);border-radius:8px;padding:14px}
.result small{display:block;color:var(--muted);font-size:.85rem}
.result strong{font-size:1.4rem;font-family:"Source Serif 4",Georgia,serif}
.calc .note{font-size:.88rem;color:var(--muted);margin-top:14px}
.calc table{font-size:.9rem}
.err{color:#a3341f;font-size:.9rem;margin-top:8px}

/* pie */
.site-footer{border-top:1px solid var(--line);margin-top:64px;padding:32px 0;font-size:.9rem;color:var(--muted);background:var(--surface)}
.site-footer .cols{display:flex;flex-wrap:wrap;gap:24px 48px;justify-content:space-between}
.site-footer a{color:var(--muted)}
.site-footer ul{list-style:none;padding:0;margin:0}
.site-footer li{margin:4px 0}

@media (max-width:600px){
  body{font-size:16px}
  h1,.hero h1{font-size:1.75rem}
  .hero{padding:32px 0 16px}
}