:root{
  --text:#232a2f;
  --title:#2f3f4b;
  --teal:#2c6e73;
  --teal-dark:#24585d;
  --soft:#eef6f6;
  --bg:#f7f8f8;
  --paper:#ffffff;
  --line:#dfe7e7;
  --muted:#6f777c;
  --accent:#c8963d;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:"Segoe UI",Arial,Helvetica,sans-serif;
  font-size:17px;
  line-height:1.82;
}
a{color:var(--teal);text-decoration:underline;text-underline-offset:3px}
.wrap{width:min(980px,92%);margin:auto}
.header{
  background:#fff;
  border-bottom:1px solid var(--line);
  position:sticky;
  top:0;
  z-index:20;
}
.header-inner{
  min-height:76px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
}
.brand{
  color:var(--title);
  text-decoration:none;
  font-size:21px;
  font-weight:800;
}
.brand small{
  display:block;
  margin-top:2px;
  color:var(--muted);
  font-size:12px;
  font-weight:500;
}
.nav a{
  color:var(--title);
  text-decoration:none;
  font-size:14px;
  font-weight:700;
}
.hero{
  padding:64px 0 56px;
  background:linear-gradient(135deg,#edf7f7,#fbfcfc);
  border-bottom:1px solid var(--line);
}
.hero .label{
  color:var(--teal-dark);
  font-size:12px;
  font-weight:800;
  letter-spacing:.14em;
  text-transform:uppercase;
}
.hero h1{
  max-width:900px;
  margin:12px 0 18px;
  color:var(--title);
  font-size:clamp(40px,5.4vw,64px);
  line-height:1.12;
  font-weight:800;
  letter-spacing:-.025em;
}
.hero p{
  max-width:830px;
  color:#4e5d62;
  font-size:20px;
  margin:0;
}
.article{
  margin:34px auto;
  padding:58px 72px;
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:18px;
  box-shadow:0 12px 32px rgba(39,77,80,.06);
}
.breadcrumb{
  margin-bottom:22px;
  color:var(--muted);
  font-size:13px;
}
.article h1{
  margin:0 0 16px;
  color:var(--title);
  font-size:clamp(38px,5vw,56px);
  line-height:1.16;
  font-weight:800;
  letter-spacing:-.02em;
}
.article h2{
  margin:48px 0 14px;
  color:var(--title);
  font-size:31px;
  line-height:1.28;
  font-weight:800;
}
.article h3{
  margin:30px 0 10px;
  color:var(--teal-dark);
  font-size:22px;
}
.lead{
  color:#536166;
  font-size:21px;
  line-height:1.7;
}
.meta{
  margin:24px 0 30px;
  padding:12px 0;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  color:var(--muted);
  font-size:13px;
}
.toc{
  margin:28px 0 36px;
  padding:22px 26px;
  background:var(--soft);
  border:1px solid #d7e7e7;
  border-radius:14px;
}
.toc strong{color:var(--title)}
.article p{margin:14px 0}
.article ul,.article ol{padding-left:24px}
.article li{margin:8px 0}
.note{
  margin:28px 0;
  padding:18px 20px;
  background:#fff8e9;
  border-left:4px solid var(--accent);
  border-radius:8px;
}
table{
  width:100%;
  margin:24px 0;
  border-collapse:collapse;
}
th,td{
  padding:13px 14px;
  border:1px solid var(--line);
  text-align:left;
}
th{
  background:var(--soft);
  color:var(--title);
}
.footer{
  padding:28px 0 42px;
  color:var(--muted);
  text-align:center;
  font-size:14px;
}
@media(max-width:760px){
  body{font-size:16px}
  .article{padding:32px 24px;border-radius:0;margin:0 auto}
  .hero{padding:46px 0}
  .nav{display:none}
}