:root{
  --bg:#f3f7f6;
  --paper:#ffffff;
  --ink:#14252b;
  --muted:#4a6068;
  --accent:#0f4c5c;
  --accent2:#1a7a6d;
  --accent-soft:#d5ebe6;
  --line:#c9d8d4;
  --warn:#8b3a2f;
  --max:70rem;
  --radius:.55rem;
  --shadow:0 1px 2px rgba(15,76,92,.06),0 8px 24px rgba(15,76,92,.06);
  --font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --font-display:ui-serif,Georgia,"Times New Roman",serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font);
  color:var(--ink);
  background:
    radial-gradient(1200px 400px at 10% -10%,#d9efe9 0%,transparent 55%),
    radial-gradient(900px 320px at 100% 0%,#d6e4ef 0%,transparent 50%),
    var(--bg);
  line-height:1.65;
}
a{color:var(--accent2);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--accent)}
.wrap{width:min(var(--max),calc(100% - 2rem));margin-inline:auto}
.skip{position:absolute;left:-999px}
.skip:focus{left:1rem;top:1rem;background:#fff;padding:.55rem 1rem;z-index:20;border-radius:.35rem;box-shadow:var(--shadow)}
.site-header{
  border-bottom:1px solid var(--line);
  background:rgba(255,255,255,.9);
  backdrop-filter:blur(8px);
  position:sticky;top:0;z-index:8;
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.9rem 0}
.logo{display:flex;gap:.75rem;align-items:center;color:inherit;text-decoration:none}
.logo-mark{
  width:2.6rem;height:2.6rem;border-radius:.7rem;
  display:grid;place-items:center;
  background:linear-gradient(145deg,var(--accent),var(--accent2));
  color:#fff;font-weight:700;font-size:1rem;
  box-shadow:inset 0 0 0 2px rgba(255,255,255,.2);
}
.logo-text{display:flex;flex-direction:column;line-height:1.15}
.logo-text strong{font-size:1.05rem;letter-spacing:-.01em}
.logo-text small{color:var(--muted);font-size:.78rem}
.nav-toggle{display:none;border:1px solid var(--line);background:var(--paper);padding:.45rem .75rem;border-radius:.4rem;font:inherit}
.nav-main{display:flex;gap:.35rem 1.05rem;list-style:none;margin:0;padding:0;flex-wrap:wrap;align-items:center}
.nav-main a{color:var(--ink);text-decoration:none;font-size:.94rem;font-weight:500;padding:.25rem 0}
.nav-main .active a,.nav-main a:hover{color:var(--accent)}
.lang-pill{font-size:.8rem!important;border:1px solid var(--line);border-radius:999px;padding:.2rem .55rem!important;background:var(--accent-soft)}
.main{padding:2rem 0 3.25rem}
.hero{
  background:linear-gradient(135deg,#0f4c5c 0%,#1a7a6d 55%,#2a8f7a 100%);
  color:#f4fffc;
  border-radius:1rem;
  padding:2rem 1.6rem;
  margin-bottom:2rem;
  box-shadow:var(--shadow);
  position:relative;overflow:hidden;
}
.hero::after{
  content:"";position:absolute;right:-4rem;top:-3rem;width:16rem;height:16rem;
  border-radius:50%;background:rgba(255,255,255,.08);
}
.hero h1{margin:0 0 .75rem;font-family:var(--font-display);font-size:clamp(1.7rem,3.4vw,2.45rem);line-height:1.2;position:relative;z-index:1}
.hero .lead{color:rgba(244,255,252,.92);font-size:1.08rem;max-width:46rem;position:relative;z-index:1}
.hero a{color:#fff;font-weight:600}
.lead{color:var(--muted);font-size:1.05rem}
.grid-2{display:grid;grid-template-columns:1.7fr 1fr;gap:1.4rem}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}
.card-list,.side-card,.panel{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);
  padding:1.25rem 1.3rem;box-shadow:var(--shadow);
}
.card-list h2,.side-card h2,.panel h2{margin-top:0;font-size:1.15rem;font-family:var(--font-display)}
.card-list ul,.side-card ul{padding-left:1.1rem;margin:.4rem 0}
.card-list li{margin:.5rem 0}
.breadcrumbs{font-size:.9rem;color:var(--muted);margin-bottom:1rem}
.breadcrumbs a{color:var(--muted)}
.article{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);
  padding:1.6rem 1.45rem 2.1rem;max-width:48rem;box-shadow:var(--shadow);
}
.article h1{margin:.15rem 0 .5rem;line-height:1.25;font-family:var(--font-display);font-size:clamp(1.45rem,2.6vw,1.95rem)}
.article h2{margin-top:1.85rem;border-bottom:1px solid var(--line);padding-bottom:.35rem;font-size:1.22rem;font-family:var(--font-display)}
.eyebrow{text-transform:uppercase;letter-spacing:.05em;font-size:.72rem;color:var(--accent2);margin:0 0 .45rem;font-weight:700}
.faq details{border:1px solid var(--line);border-radius:.4rem;padding:.65rem .85rem;margin:.55rem 0;background:#fbfefd}
.faq summary{cursor:pointer;font-weight:600}
.related{padding-left:1.1rem}
.term-def{font-size:1.05rem;background:var(--accent-soft);border-left:4px solid var(--accent);padding:1rem 1.1rem;border-radius:0 .4rem .4rem 0;margin:1rem 0 1.4rem}
.site-footer{border-top:1px solid var(--line);background:#e7efed;padding:1.7rem 0 2.2rem;color:var(--muted);font-size:.92rem}
.footer-inner{display:grid;gap:1rem}
.footer-nav{display:flex;flex-wrap:wrap;gap:.7rem 1.2rem;list-style:none;padding:0;margin:0}
.footer-nav a{color:var(--ink)}
.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(15.5rem,1fr));gap:1rem}
.cat-card{
  background:var(--paper);border:1px solid var(--line);border-radius:.55rem;padding:1.1rem 1.15rem;
  text-decoration:none;color:inherit;display:block;box-shadow:var(--shadow);
  transition:border-color .15s,transform .15s;
}
.cat-card:hover{border-color:var(--accent2);transform:translateY(-2px)}
.cat-card h2{margin:0 0 .45rem;font-size:1.08rem;color:var(--accent);font-family:var(--font-display)}
.note{font-size:.9rem;color:var(--muted)}
.tag{display:inline-block;font-size:.75rem;background:var(--accent-soft);color:var(--accent);padding:.15rem .45rem;border-radius:.3rem;margin-right:.35rem}
.cta-row{display:flex;flex-wrap:wrap;gap:.75rem;margin-top:1.1rem;position:relative;z-index:1}
.btn{
  display:inline-block;background:#fff;color:var(--accent)!important;text-decoration:none;
  padding:.55rem 1rem;border-radius:.45rem;font-weight:600;box-shadow:0 1px 0 rgba(0,0,0,.05);
}
.btn-ghost{background:transparent;color:#fff!important;border:1px solid rgba(255,255,255,.45)}
.article-hero{display:block;width:100%;max-width:720px;height:auto;margin:1rem 0 1.5rem;border:1px solid var(--line);border-radius:.5rem}
.ext{font-size:.95rem}
.mesh{display:flex;flex-wrap:wrap;gap:.5rem;margin:1rem 0}
.mesh a{background:#f7fbfa;border:1px solid var(--line);border-radius:999px;padding:.25rem .7rem;text-decoration:none;font-size:.88rem;color:var(--ink)}
.mesh a:hover{border-color:var(--accent2);color:var(--accent)}
@media (max-width:860px){
  .grid-2,.grid-3{grid-template-columns:1fr}
  .nav-toggle{display:inline-block}
  .site-nav{display:none;width:100%}
  .site-nav.open{display:block}
  .header-inner{flex-wrap:wrap}
  .nav-main{flex-direction:column;padding:.55rem 0 0;align-items:flex-start}
}