:root{
  --bg:#f8fafc;
  --surface:#ffffff;
  --text:#111827;
  --muted:#4b5563;
  --line:#e5e7eb;
  --brand:#0f766e;
  --brand-dark:#115e59;
  --accent:#2563eb;
  --soft:#ecfdf5;
  --warn:#fff7ed;
  --shadow:0 18px 40px rgba(15,23,42,.08);
  --radius:18px;
  --max:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.65}
a{color:var(--brand-dark);text-decoration-thickness:.08em;text-underline-offset:.18em}
a:hover{color:var(--accent)}
img{max-width:100%;height:auto}
.wrap{width:min(var(--max),calc(100% - 32px));margin:0 auto}
.narrow{max-width:900px}
.site-header{background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20;backdrop-filter:blur(10px)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:14px 0}
.brand{display:flex;align-items:center;gap:12px;color:var(--text);text-decoration:none;min-width:260px}
.brand span{display:flex;flex-direction:column;line-height:1.1}
.brand em{font-style:normal;color:var(--muted);font-size:.78rem;margin-top:3px}
.topnav{display:flex;flex-wrap:wrap;gap:10px;justify-content:flex-end}
.topnav a{display:inline-block;text-decoration:none;color:var(--text);padding:8px 10px;border-radius:999px;font-size:.95rem}
.topnav a:hover,.topnav a.active{background:var(--soft);color:var(--brand-dark)}
.hero{padding:56px 0 34px;background:linear-gradient(135deg,#ecfdf5,#eff6ff 70%,#fff)}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.7fr) minmax(280px,.8fr);gap:28px;align-items:stretch}
.hero h1,.article h1{font-size:clamp(2.1rem,5vw,4rem);line-height:1.05;margin:.2rem 0 1rem}
.kicker,.topic-label{letter-spacing:.08em;text-transform:uppercase;font-size:.78rem;font-weight:800;color:var(--brand-dark)}
.lead{font-size:1.18rem;color:#263241;max-width:850px}
.hero-card,.card,.summary-box,.notice,.author-box,.tool-card,.library-note{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}
.hero-card{background:#ffffffcc}
.button,button{display:inline-block;border:0;background:var(--brand);color:#fff!important;border-radius:999px;padding:10px 16px;text-decoration:none;font-weight:700;cursor:pointer}
.button.secondary{background:#e0f2fe;color:#075985!important}
button:hover,.button:hover{filter:brightness(.96)}
.section{padding:34px 0}
.section-intro{color:var(--muted);max-width:850px}
.grid{display:grid;gap:18px}
.grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}
.category-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.category-tile{display:block;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;text-decoration:none;color:var(--text);box-shadow:var(--shadow)}
.category-tile span{display:block;color:var(--brand-dark);font-size:.78rem;font-weight:800;text-transform:uppercase;letter-spacing:.08em}
.category-tile strong{display:block;font-size:1.3rem;margin:.4rem 0}
.category-tile em{display:block;color:var(--muted);font-style:normal}
.card h2,.card h3{margin-top:0}
.article-card{box-shadow:none}
.article{padding:36px 0}
.article-meta,.muted,.breadcrumbs{color:var(--muted)}
.breadcrumbs{font-size:.9rem}
.summary-box{background:#f0fdfa}
.notice{background:#fff;border-left:5px solid var(--brand);box-shadow:none}
.notice.strong{background:#ecfdf5}
.library-note{background:#f8fafc;box-shadow:none}
.ad-slot{margin:28px 0;background:#f1f5f9;border:1px dashed #cbd5e1;border-radius:14px;min-height:90px;display:flex;align-items:center;justify-content:center;color:#64748b;font-size:.82rem;text-transform:uppercase;letter-spacing:.08em}
table{width:100%;border-collapse:collapse;margin:20px 0;background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden}
th,td{padding:12px;border:1px solid var(--line);vertical-align:top;text-align:left}
th{background:#f8fafc}
.checklist{display:grid;gap:10px;margin:18px 0}
.checklist label{display:block;background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px}
.diagram{display:grid;gap:12px;margin:22px 0}
.diagram.three{grid-template-columns:repeat(3,minmax(0,1fr))}
.diagram.compliance-map{grid-template-columns:repeat(4,minmax(0,1fr))}
.diagram div,.flow span{background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px;box-shadow:0 8px 20px rgba(15,23,42,.05)}
.diagram strong{display:block;color:var(--brand-dark)}
.diagram span{display:block;color:var(--muted);font-size:.95rem;margin-top:4px}
.flow{display:flex;flex-wrap:wrap;gap:10px;align-items:stretch;margin:22px 0}
.flow span{position:relative;flex:1;min-width:150px;text-align:center}
.tool-card label{display:grid;gap:6px;margin:14px 0;font-weight:700}
input,select,textarea{width:100%;padding:11px;border:1px solid #cbd5e1;border-radius:12px;font:inherit;background:#fff}
.output{margin-top:22px}
.author-box{background:#f8fafc;box-shadow:none}
.site-footer{margin-top:50px;background:#0f172a;color:#e5e7eb;padding:34px 0 20px}
.site-footer a{color:#c7f9e9}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:24px}
.copyright{border-top:1px solid rgba(255,255,255,.12);margin-top:20px;padding-top:18px;color:#cbd5e1}
@media (max-width:900px){
  .header-inner{display:block}
  .topnav{justify-content:flex-start;margin-top:12px}
  .hero-grid,.grid.three,.category-grid,.diagram.three,.diagram.compliance-map,.footer-grid{grid-template-columns:1fr}
  .brand{min-width:0}
}
@media print{
  .site-header,.site-footer,.ad-slot{display:none}
  body{background:#fff}
  .card,.summary-box,.notice,.author-box{box-shadow:none}
}