/* Post page — dark elegant style */
:root{
  --bg: #0f1222;
  --bg-soft: #131735;
  --panel: #171b3a;
  --text: #e7e9f4;
  --muted: #b5b9d8;
  --brand1: #5e2ea5;
  --brand2: #9c27b0;
  --link: #c78cff;
  --accent: #ffd166;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: radial-gradient(1200px 800px at 20% -10%, rgba(156,39,176,.12), transparent 50%) ,
              radial-gradient(1200px 800px at 80% 110%, rgba(94,46,165,.18), transparent 50%),
              var(--bg);
  color:var(--text);
  line-height:1.7;
}

/* Layout helpers */
.container{max-width:1200px; margin:0 auto; padding:0 20px;}
a{color:var(--link); text-decoration:none}
a:hover{text-decoration:underline}

/* Top bar */
.topbar{
  position:sticky; top:0; z-index:10;
  background: linear-gradient(90deg, var(--brand1), var(--brand2));
  box-shadow: var(--shadow);
}
.topbar .container{display:flex; align-items:center; justify-content:space-between; min-height:64px;}
.brand{display:flex; align-items:center; gap:.6rem; font-weight:800; color:#fff; letter-spacing:.2px}
.brand:hover{text-decoration:none}
.brand-badge{
  display:inline-grid; place-items:center;
  width:34px; height:34px; border-radius:8px; font-weight:800;
  background:#fff; color:#211;
}
.nav a{color:#fff; margin-left:18px; font-weight:600; opacity:.95}
.nav a:hover{opacity:1}

/* Hero */
.post-hero{
  position:relative; isolation:isolate;
  background: radial-gradient(900px 500px at 70% -10%, rgba(0,0,0,.35), rgba(0,0,0,.75)),
              radial-gradient(900px 600px at 0% 100%, rgba(0,0,0,.25), rgba(0,0,0,.75)),
              var(--bg-soft);
}
.post-hero::before{
  content:""; position:absolute; inset:0;
  background-image:var(--hero);
  background-size:cover; background-position:center;
  opacity:.25; z-index:-1;
  filter:saturate(80%);
}
.hero-inner{padding:56px 0}
.post-eyebrow{color:var(--muted); font-weight:600; letter-spacing:.2px; text-transform:uppercase; font-size:.8rem}
.post-title{font-size:clamp(28px, 3.6vw, 52px); margin:.4rem 0 0}

/* Content layout */
.post-wrap{display:grid; grid-template-columns: 280px 1fr; gap:28px; margin:34px auto 60px}
@media (max-width: 960px){ .post-wrap{grid-template-columns:1fr} .toc{order:2} }

.toc{
  position:sticky; top:96px; align-self:start;
  background:linear-gradient(180deg, #1a1f44, #151a3a);
  border:1px solid rgba(255,255,255,.06);
  border-radius:14px; padding:18px 16px 16px;
  box-shadow: var(--shadow);
}
.toc h3{margin:.25rem 0 10px; font-size:1rem; letter-spacing:.3px}
.toc ol{margin:0; padding-left:18px}
.toc ol li{margin:.18rem 0}
.toc ol li a{color:#eaeaff}
.toc ol li a:hover{color:#fff}
.toc ol ol{margin:.25rem 0 .5rem; padding-left:20px; opacity:.95}

.post{
  background:linear-gradient(180deg, #161b3b, #111633);
  border:1px solid rgba(255,255,255,.06);
  border-radius:16px; padding:24px;
  box-shadow: var(--shadow);
}
.lead{font-size:1.05rem; color:#eaeaff; opacity:.95}
.post-cover{margin:18px 0 8px}
.post-cover img{width:100%; height:auto; border-radius:12px; display:block; box-shadow:0 12px 28px rgba(0,0,0,.35)}
.post-cover figcaption{font-size:.85rem; color:var(--muted); margin-top:6px}

h2{font-size:clamp(22px, 2.2vw, 30px); margin:28px 0 10px; line-height:1.25}
h3{font-size:clamp(18px, 1.6vw, 22px); margin:18px 0 8px}

blockquote{
  margin:14px 0; padding:14px 16px;
  border-left:4px solid var(--accent);
  background:rgba(255, 209, 102, .08);
  border-radius:8px;
}

pre{background:#0b0e22; color:#e7e9f4; padding:14px 16px; border-radius:10px; overflow:auto; border:1px solid rgba(255,255,255,.08)}
code{font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace}
.math{background:rgba(255,255,255,.04); padding:10px 12px; border-radius:8px;}

ul{padding-left:1.15rem}
.post-end{margin-top:28px}
.btn{
  display:inline-block; background:linear-gradient(90deg, var(--brand1), var(--brand2));
  color:#fff; padding:10px 14px; border-radius:10px; font-weight:700; letter-spacing:.2px;
  box-shadow: var(--shadow);
}
.btn:hover{opacity:.95; text-decoration:none}

/* Footer */
.site-footer{border-top:1px solid rgba(255,255,255,.07); background:linear-gradient(90deg, #151a3a, #14183a);}
.site-footer .container{padding:20px 0; font-size:.95rem; color:var(--muted)}