:root{
  --bg:#F7F8FA;
  --surface:#FFFFFF;
  --primary:#0F766E;
  --primary-dark:#0B5E57;
  --text:#0F172A;
  --muted:#475569;
  --border:#E2E8F0;
  --link:#0E7490;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif;
  line-height: 1.6;
}
a{color:var(--link);text-decoration:none}
a:hover{text-decoration:underline}
.header{
  background: var(--primary);
  color: #fff;
  padding: 12px 0;
  position: sticky;
  top: 0;
  z-index: 10;
  box-shadow: 0 4px 12px rgba(0,0,0,.08);
}
.container{max-width: 980px; margin: 0 auto; padding: 0 20px;}
.brand{display:flex; align-items:center; gap:10px; font-weight:700; letter-spacing:.2px}
.brand img{width:28px;height:28px;border-radius:6px; background:#fff; padding:2px}
.nav{display:flex; gap:12px; align-items:center; flex-wrap:wrap}
.nav a{
  color:#fff; text-decoration:none; padding:8px 12px; border-radius:999px;
  border:1px solid rgba(255,255,255,.25);
}
.nav a:hover{background:rgba(255,255,255,.14)}
.main{padding:28px 0}
.card{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:16px;
  padding:24px;
  box-shadow: 0 10px 20px rgba(15,23,42,0.05);
}
h1{margin:.2em 0 .3em; font-size: clamp(28px, 4vw, 40px);}
h2{margin-top:1.4em; font-size: clamp(20px, 3vw, 28px);}
p,li{color:var(--text)}
.badge{
  display:inline-block; padding:6px 10px; border-radius:999px;
  background:#DCFCE7; color:#065F46; border:1px solid #BBF7D0; font-weight:700; font-size:12px;
}
.button{
  display:inline-block; padding:12px 16px; border-radius:16px;
  background: var(--primary); color:#fff; font-weight:700; border:1px solid var(--primary-dark);
}
.button:hover{background:var(--primary-dark)}
.footer{
  color: var(--muted); font-size:14px; text-align:center; padding:24px 0 40px;
}
.kb{
  background: #F8FAFC; border: 1px solid var(--border); border-radius:12px;
  padding: 12px; font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  overflow-x:auto;
}