:root{
  --bg:#ffffff;
  --bg2:#f5f5f7;
  --ink:#1d1d1f;
  --text:#424245;
  --muted:#86868b;
  --accent:#0066ff;
  --line:rgba(0,0,0,.09);
  --head:'Inter Tight','Inter',sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
::selection{background:rgba(0,102,255,.14);color:var(--ink)}
body{background:var(--bg);color:var(--text);font-family:'Inter',system-ui,sans-serif;line-height:1.72;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;display:block}
.container{max-width:1120px;margin:0 auto;padding:0 24px}

/* NAV */
nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,.82);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:60px}
.logo img{height:32px;width:auto;filter:invert(1) brightness(.2)}
.nav-links{display:flex;gap:30px;align-items:center}
.nav-links a{color:var(--text);font-size:.9rem;font-weight:500;transition:color .2s}
.nav-links a:hover{color:var(--ink);text-decoration:none}
.btn{display:inline-block;padding:14px 32px;border-radius:100px;font-weight:500;transition:background .25s;cursor:pointer;border:none;font-size:.98rem;font-family:'Inter',sans-serif}
.btn:hover{text-decoration:none}
.btn-primary{background:var(--ink);color:#fff}
.btn-primary:hover{background:#3a3a3d}
.btn-sm{padding:9px 20px;font-size:.88rem}
.nav-links a.btn-primary{color:#fff}
@media(max-width:820px){.nav-links a:not(.btn){display:none}}

/* ARTICLE */
.article{max-width:760px;margin:0 auto;padding:140px 24px 90px}
.crumbs{font-size:.85rem;color:var(--muted);margin-bottom:28px}
.crumbs a{color:var(--muted)}
.crumbs a:hover{color:var(--ink)}
.term{display:block;font-family:'JetBrains Mono',monospace;color:#b4b4bb;font-size:.72rem;letter-spacing:2px;margin-bottom:16px}
.term::before{content:"> "}
h1{font-family:var(--head);color:var(--ink);font-weight:700;letter-spacing:-.025em;line-height:1.12;font-size:clamp(2rem,4.6vw,3rem);margin-bottom:18px}
.article .lead{color:var(--muted);font-size:1.12rem;margin-bottom:14px}
.meta{font-size:.85rem;color:var(--muted);padding-bottom:28px;border-bottom:1px solid var(--line);margin-bottom:40px}
.article h2{font-family:var(--head);color:var(--ink);font-weight:700;letter-spacing:-.02em;line-height:1.2;font-size:1.55rem;margin:52px 0 16px}
.article h3{font-family:var(--head);color:var(--ink);font-weight:600;letter-spacing:-.01em;font-size:1.15rem;margin:34px 0 10px}
.article p{margin-bottom:16px}
.article ul,.article ol{margin:0 0 18px 22px}
.article li{margin-bottom:8px}
.article b,.article strong{color:var(--ink);font-weight:600}
.article table{width:100%;border-collapse:collapse;margin:24px 0;font-size:.94rem}
.article th{text-align:left;font-family:var(--head);font-weight:600;color:var(--ink);letter-spacing:-.01em}
.article th,.article td{padding:12px 14px;border-bottom:1px solid var(--line)}
.article tr td:first-child,.article tr th:first-child{padding-left:0}
.tip{background:var(--bg2);border-radius:18px;padding:24px 28px;margin:28px 0;font-size:.96rem}
.tip b{color:var(--ink)}

/* CTA */
.cta-box{background:#0c0c0e;border-radius:24px;padding:44px 40px;margin:56px 0 0;text-align:center}
.cta-box h2{color:#f5f5f7;margin:0 0 10px;font-size:1.6rem}
.cta-box p{color:#86868b;max-width:480px;margin:0 auto 26px}
.cta-box .btn-primary{background:#fff;color:var(--ink)}
.cta-box .btn-primary:hover{background:#e8e8ed}
.cta-btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.btn-ghost{background:transparent;color:var(--ink);border:1px solid var(--line)}
.cta-box .btn-ghost{color:#f5f5f7;border:1px solid rgba(255,255,255,.28)}
.cta-box .btn-ghost:hover{background:rgba(255,255,255,.08);text-decoration:none}

/* related */
.related{border-top:1px solid var(--line);margin-top:56px;padding-top:32px}
.related h2{margin-top:0;font-size:1.2rem}
.related ul{list-style:none;margin:0}
.related li{padding:9px 0;border-bottom:1px solid var(--line);margin:0}
.related li:last-child{border-bottom:none}

/* BLOG INDEX */
.blog-head{padding:150px 0 30px;text-align:center}
.blog-head .sub{color:var(--muted);max-width:640px;margin:0 auto;font-size:1.08rem}
.post-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px;padding:40px 0 100px}
.post-card{background:var(--bg2);border-radius:22px;padding:32px;display:flex;flex-direction:column;transition:transform .35s cubic-bezier(.25,.1,.25,1),box-shadow .35s;color:inherit}
.post-card:hover{transform:translateY(-5px);box-shadow:0 24px 50px rgba(0,0,0,.1);text-decoration:none}
.post-card .tag{font-size:.68rem;letter-spacing:1px;text-transform:uppercase;font-weight:600;color:var(--muted);margin-bottom:12px}
.post-card h3{font-family:var(--head);color:var(--ink);font-weight:600;letter-spacing:-.01em;font-size:1.12rem;line-height:1.3;margin-bottom:10px}
.post-card p{color:var(--muted);font-size:.92rem;flex:1}
.post-card span.more{margin-top:14px;color:var(--accent);font-weight:500;font-size:.88rem}

footer{border-top:1px solid var(--line);padding:34px 0;text-align:center;color:var(--muted);font-size:.86rem}
footer a{color:var(--muted)}

@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}