:root{
  --bg:#0f172a;
  --bg-soft:#111827;
  --panel:#ffffff;
  --text:#1f2937;
  --muted:#6b7280;
  --line:#e5e7eb;
  --accent:#2563eb;
  --accent-dark:#1d4ed8;
  --light:#f8fafc;
  --max:1160px;
  --radius:16px;
  --shadow:0 12px 35px rgba(0,0,0,0.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Arial,Helvetica,sans-serif;
  background:var(--light);
  color:var(--text);
  line-height:1.65;
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--max);margin:0 auto}
.hero{
  background:linear-gradient(135deg,var(--bg) 0%,var(--bg-soft) 100%);
  color:#fff;
  padding:78px 20px 58px;
}
.eyebrow{
  font-size:.92rem;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:rgba(255,255,255,.7);
  margin-bottom:10px;
}
.hero h1{
  margin:0 0 16px;
  font-size:2.7rem;
  line-height:1.12;
  max-width:950px;
}
.subtitle{
  margin:0;
  max-width:880px;
  color:rgba(255,255,255,.88);
  font-size:1.08rem;
}
.top-links{
  margin-top:28px;
  display:flex;
  flex-wrap:wrap;
  gap:12px;
}
.btn{
  display:inline-block;
  padding:12px 18px;
  border-radius:999px;
  font-weight:bold;
  transition:.2s ease;
}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-dark);text-decoration:none}
.btn-secondary{
  border:1px solid rgba(255,255,255,.25);
  color:#fff;
}
.btn-secondary:hover{
  background:rgba(255,255,255,.08);
  text-decoration:none;
}
.nav{
  background:#fff;
  border-bottom:1px solid var(--line);
  position:sticky;
  top:0;
  z-index:20;
}
.nav-inner{
  max-width:var(--max);
  margin:0 auto;
  padding:14px 20px;
  display:flex;
  flex-wrap:wrap;
  gap:16px;
  align-items:center;
  justify-content:space-between;
}
.nav-title{font-weight:bold}
.nav-links{
  display:flex;
  flex-wrap:wrap;
  gap:14px;
}
.nav-links a{
  color:var(--muted);
  font-size:.95rem;
}
main{padding:36px 20px 70px}
.layout{
  display:grid;
  grid-template-columns:1.35fr .85fr;
  gap:28px;
  align-items:start;
}
.panel{
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:28px;
  box-shadow:var(--shadow);
  margin-bottom:24px;
}
.panel h2{
  margin-top:0;
  margin-bottom:14px;
  font-size:1.4rem;
}
.panel h3{
  margin-top:24px;
  margin-bottom:10px;
  font-size:1.05rem;
}
.lead{font-size:1.02rem}
.notice{
  background:#eff6ff;
  border:1px solid #bfdbfe;
  color:#1e3a8a;
  border-radius:12px;
  padding:14px 16px;
  font-size:.96rem;
  margin-top:18px;
}
.meta-grid{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:14px;
  margin-top:18px;
}
.meta-box{
  background:#f9fafb;
  border:1px solid var(--line);
  border-radius:12px;
  padding:14px;
}
.meta-box strong{
  display:block;
  margin-bottom:4px;
  font-size:.95rem;
}
.link-cards a{
  display:block;
  padding:12px 14px;
  border:1px solid var(--line);
  border-radius:10px;
  margin-bottom:10px;
  background:#fff;
}
.link-cards a:hover{
  background:#f8fafc;
  text-decoration:none;
}
.clean{
  margin:0;
  padding-left:18px;
}
.clean li{margin-bottom:8px}
.formula{
  background:#f8fafc;
  border:1px solid var(--line);
  border-radius:12px;
  padding:12px 14px;
  font-family:Georgia,serif;
}
footer{
  border-top:1px solid var(--line);
  background:#fff;
  padding:26px 20px;
  color:var(--muted);
  font-size:.94rem;
}
.footer-inner{
  display:flex;
  flex-wrap:wrap;
  gap:12px 24px;
  justify-content:space-between;
}
@media (max-width: 950px){
  .layout{grid-template-columns:1fr}
  .hero h1{font-size:2.1rem}
  .meta-grid{grid-template-columns:1fr}
}