:root{
  --bg:#f6f9fc; --card:#ffffff; --ink:#1f2a44; --muted:#54657e;
  --brand:#0b6bff; --brand-2:#1ec2b3; --line:#e7eef6;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family: Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji"; background:var(--bg); color:var(--ink); line-height:1.6}
a{color:var(--brand); text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1100px;margin:0 auto;padding:24px}
.navbar{position:sticky;top:0;background:rgba(255,255,255,.9);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);z-index:50}
.navbar__inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:10px 16px;max-width:1100px;margin:0 auto}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--ink)}
.brand-badge{width:36px;height:36px;border-radius:10px;background:linear-gradient(135deg,var(--brand),var(--brand-2));display:grid;place-items:center;color:white;font-weight:800}
nav.toc{display:flex;gap:8px;flex-wrap:wrap}
.toc a{background:#eef5ff;border:1px solid #d9e8ff;color:#0842a0;padding:6px 10px;border-radius:999px;font-size:.9rem}
.main{display:grid;grid-template-columns:280px 1fr;gap:24px;margin-top:20px}
@media (max-width: 920px){ .main{grid-template-columns:1fr} aside{order:2} }
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;box-shadow:0 8px 24px rgba(0,0,0,.05)}
.card.pad{padding:18px}
.card h2, .card h3{margin-top:0}
.hero{display:grid;gap:16px;grid-template-columns:1fr}
.hero .header{display:flex; align-items:center; gap:14px; flex-wrap:wrap}
.hero .kicker{color:var(--muted); font-weight:600; letter-spacing:.04em; text-transform:uppercase}
.hero .title{font-size:clamp(1.4rem, 2.6vw, 2.1rem); margin:4px 0}
.hero .subtitle{color:var(--muted)}
.content :is(h1,h2){border-bottom:1px solid var(--line); padding-bottom:8px}
.content h1{font-size:clamp(1.6rem,3vw,2.2rem)}
.content h2{font-size:clamp(1.2rem,2.4vw,1.6rem); margin-top:30px}
.content h3{font-size:1.1rem; color:#0d3b8e; margin-top:20px}
.content p{margin:12px 0}
.content ul, .content ol{padding-left:22px}
.content blockquote{border-left:4px solid var(--brand); background:#f0f6ff; padding:10px 14px; border-radius:8px; color:#0d3b8e}
.content pre.code{background:#0b1220; color:#eef2ff; border-radius:12px; padding:14px; overflow:auto; border:1px solid #1b2540}
.content code{font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace}
.content table{width:100%;border-collapse:collapse;margin-block:12px}
.content th, .content td{border:1px solid var(--line); padding:10px}
.content th{background:#e9f2ff; text-align:left}
.badge{display:inline-block;padding:4px 10px;border-radius:999px;background:#e6fbf8;color:#03685f;border:1px solid #b6efe7;font-weight:600;font-size:.85rem}
.footer{margin:26px auto 50px;max-width:1100px;color:var(--muted);text-align:center}