:root{
  --bg:#ffffff;
  --text:#0b1220;
  --muted:#4b5565;
  --line:#e6e9ef;
  --card:#f7f8fb;
  --brand:#0b5fff;
  --brand2:#083ea6;
  --radius:14px;
  --shadow: 0 10px 30px rgba(11,18,32,.08);
  --max: 1120px;
  --content: 740px;
  --sidebar: 340px;
  --font: system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font);
  color:var(--text);
  background:var(--bg);
  line-height:1.65;
  text-rendering:optimizeLegibility;
}
a{color:var(--brand); text-decoration:none}
a:hover{text-decoration:underline}
code{background:#f2f4f8; padding:2px 6px; border-radius:8px; border:1px solid var(--line)}
small{color:var(--muted)}
img{max-width:100%; height:auto}

.wrap{max-width:var(--max); margin:0 auto; padding:0 18px;}
.skip-link{
  position:absolute; left:-999px; top:auto; width:1px; height:1px; overflow:hidden;
}
.skip-link:focus{
  position:fixed; left:16px; top:16px; width:auto; height:auto;
  padding:10px 12px; background:#111827; color:#fff; border-radius:10px; z-index:9999;
}

header{
  position:sticky; top:0; z-index:50;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(160%) blur(10px);
  border-bottom:1px solid var(--line);
}
.topbar{
  display:flex; align-items:center; justify-content:space-between;
  padding:12px 0;
  gap:14px;
}
.brand{
  display:flex; align-items:center; gap:10px;
}
.logo{
  width:36px; height:36px; border-radius:12px;
  background:linear-gradient(135deg,var(--brand),#62b2ff);
  box-shadow:0 10px 20px rgba(11,95,255,.18);
  display:grid; place-items:center;
  flex:0 0 auto;
}
.logo svg{width:20px; height:20px}
.brand-title{margin:0; font-size:16px; line-height:1.15; letter-spacing:.2px}
.brand-sub{margin:0; font-size:12px; color:var(--muted)}

nav{display:flex; gap:10px; flex-wrap:wrap; justify-content:flex-end}
nav a{
  font-size:13px; padding:8px 10px; border-radius:10px;
  color:#111827; border:1px solid transparent;
}
nav a:hover{border-color:var(--line); background:#fff; text-decoration:none}
nav a[aria-current="page"]{color:var(--brand2); font-weight:700}

.hero{
  padding:22px 0 14px;
  border-bottom:1px solid var(--line);
  background:
    radial-gradient(700px 220px at 20% 0%, rgba(11,95,255,.10), transparent 60%),
    radial-gradient(700px 220px at 90% 10%, rgba(98,178,255,.10), transparent 60%);
}
.hero-grid{
  display:grid;
  grid-template-columns: 1.2fr .8fr;
  gap:18px;
  align-items:stretch;
}
.card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  padding:18px;
}
.card.soft{
  background:var(--card);
  box-shadow:var(--shadow);
}
.kicker{
  display:inline-flex; align-items:center; gap:8px;
  padding:6px 10px; border-radius:999px;
  background:rgba(11,95,255,.08);
  color:var(--brand2);
  border:1px solid rgba(11,95,255,.18);
  font-size:12px;
  font-weight:700;
}
.btnrow{display:flex; gap:10px; flex-wrap:wrap; margin-top:12px}
.btn{
  display:inline-flex; align-items:center; gap:10px;
  padding:10px 12px;
  border-radius:12px;
  border:1px solid var(--line);
  background:#fff;
  color:#111827;
  font-weight:700;
  font-size:13px;
  text-decoration:none;
}
.btn.primary{
  background:linear-gradient(135deg,var(--brand),var(--brand2));
  border-color:transparent;
  color:#fff;
}
.btn:hover{text-decoration:none}

main{padding:18px 0 46px}
.grid{
  display:grid;
  grid-template-columns: minmax(0,var(--content)) minmax(0,var(--sidebar));
  gap:18px;
  align-items:start;
}
article{
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:18px;
}
.meta{
  display:flex; flex-wrap:wrap; gap:10px;
  font-size:12px; color:var(--muted);
  margin-bottom:10px;
}
.page-title{
  font-size:28px; margin:0 0 8px; line-height:1.2; letter-spacing:-.2px;
}
h2{margin:18px 0 8px; line-height:1.25}
h3{margin:14px 0 6px; line-height:1.25}
.lede{font-size:15px; color:var(--muted); margin:0 0 12px}

.toc{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:12px;
  padding:12px;
  margin:12px 0 16px;
}
.toc strong{display:block; margin-bottom:6px}
.toc ul{margin:0; padding-left:18px}
.toc li{margin:6px 0}

.note, .warn, .ok{
  padding:10px 12px; border-radius:10px; margin:12px 0;
}
.note{border-left:4px solid rgba(11,95,255,.55); background:rgba(11,95,255,.05); color:#1f2a44}
.warn{border-left:4px solid rgba(138,91,0,.6); background:rgba(252,211,77,.18); color:#3a2b07}
.ok{border-left:4px solid rgba(6,122,70,.6); background:rgba(16,185,129,.10); color:#053a24}

.ad{
  border:1px dashed #c7cdd9;
  background:#fbfcff;
  border-radius:12px;
  padding:12px;
  color:#6b7280;
  font-size:12px;
}
.ad strong{color:#374151}
.ad.header{min-height:90px; margin:12px 0}
.ad.sidebar{min-height:250px}
.ad.in-article{min-height:140px; margin:14px 0}

aside{
  position:sticky;
  top:76px;
  display:flex;
  flex-direction:column;
  gap:12px;
}
.sidecard{
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:14px;
}
.sidecard h3{margin:0 0 8px; font-size:14px}
.sidecard p{margin:0; color:var(--muted); font-size:13px}
.linklist{margin:10px 0 0; padding:0; list-style:none}
.linklist li{margin:8px 0}
.linklist a{
  display:block;
  padding:10px 10px;
  border-radius:12px;
  border:1px solid var(--line);
}
.linklist a:hover{background:var(--card); text-decoration:none}

.cards{
  display:grid;
  grid-template-columns: 1fr;
  gap:12px;
}
.postcard{
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:14px;
  background:#fff;
}
.postcard h3{margin:0 0 6px}
.postcard p{margin:0; color:var(--muted); font-size:13px}

footer{
  border-top:1px solid var(--line);
  background:#fff;
  padding:22px 0;
  color:var(--muted);
}
.footer-grid{
  display:grid;
  grid-template-columns: 1.2fr .8fr;
  gap:14px;
}
.fineprint{font-size:12px; color:#6b7280}

.form{
  display:grid;
  gap:10px;
  max-width:520px;
}
.input{
  width:100%;
  padding:10px 12px;
  border:1px solid var(--line);
  border-radius:12px;
  font:inherit;
}
textarea.input{min-height:120px}
hr.sep{border:none; border-top:1px solid var(--line); margin:16px 0}

@media (max-width: 980px){
  .hero-grid{grid-template-columns:1fr}
  .grid{grid-template-columns:1fr}
  aside{position:static}
  nav{justify-content:flex-start}
}