/* Blog pages. Tokens match src/index.css ("Nocturne"). */
:root {
  --ink: #06070b; --ink-1: #0b0d13; --ink-2: #11141c; --ink-3: #181c27;
  --line: rgb(255 255 255 / 0.08); --line-strong: rgb(255 255 255 / 0.16);
  --fg: #f2f4f8; --fg-2: #b6bccb; --muted: #7d8497;
  --signal: #2ad0de; --tide: #7b8cf3; --violet: #9d6cf8; --ember: #ff7448;
  --display: "Inter Tight", "Inter", system-ui, sans-serif;
  --sans: "Inter", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body { margin: 0; background: var(--ink); color: var(--fg); font: 16px/1.65 var(--sans); -webkit-font-smoothing: antialiased; overflow-x: hidden; }
::selection { background: var(--signal); color: var(--ink); }
a { color: var(--signal); text-decoration: none; }
a:hover { text-decoration: underline; }
img, svg { max-width: 100%; height: auto; }
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 640px) { .wrap { padding: 0 24px; } }
.eyebrow { font: 500 0.72rem/1 var(--mono); text-transform: uppercase; letter-spacing: 0.14em; color: var(--signal); margin: 0; }

/* Header / footer */
.site-header { position: sticky; top: 0; z-index: 10; background: rgb(11 13 19 / 0.85); backdrop-filter: blur(16px); border-bottom: 1px solid var(--line); }
.bar { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand img { height: 28px; width: auto; display: block; }
.site-header nav { display: flex; align-items: center; gap: 4px; }
.site-header nav a { color: var(--fg-2); font-size: 14px; padding: 8px 12px; border-radius: 999px; }
.site-header nav a:hover { color: var(--fg); text-decoration: none; }
.site-header .nav-blog { color: var(--fg); }
.btn { background: var(--signal); color: var(--ink) !important; font-weight: 500; }
.btn:hover { background: #5fe3d9; }
@media (max-width: 560px) { .hide-sm { display: none; } }
.site-footer { border-top: 1px solid var(--line); margin-top: 96px; padding: 32px 0; color: var(--muted); font-size: 14px; }
.foot { display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; }
.foot p { margin: 0; }
.foot a { color: var(--fg-2); }

/* Index and topics */
.hero { padding-top: 64px; padding-bottom: 32px; }
.hero h1, .post-head h1 { font: 600 clamp(2rem, 5vw, 3.4rem)/1.05 var(--display); letter-spacing: -0.035em; margin: 16px 0 16px; max-width: 22ch; }
.lead { color: var(--fg-2); font-size: 1.15rem; max-width: 62ch; margin: 0; }
.hubs { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 32px; }
.hubs a { border: 1px solid var(--line-strong); color: var(--fg-2); border-radius: 999px; padding: 6px 14px; font-size: 14px; }
.hubs a:hover { color: var(--fg); text-decoration: none; border-color: var(--signal); }
.hubs a[aria-current] { background: var(--fg); color: var(--ink); border-color: var(--fg); }
.cards { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(min(100%, 340px), 1fr)); }
.card { display: flex; flex-direction: column; gap: 10px; padding: 24px; background: var(--ink-2); border: 1px solid var(--line); border-radius: 20px; color: var(--fg); transition: border-color .2s, background .2s; }
.card:hover { text-decoration: none; border-color: rgb(42 208 222 / 0.4); background: var(--ink-3); }
.card h3 { font: 600 1.25rem/1.25 var(--display); letter-spacing: -0.02em; margin: 4px 0 0; }
.card p { color: var(--fg-2); margin: 0; font-size: 15px; flex: 1; }
.meta { color: var(--muted); font-size: 13px; }

/* Article */
.crumbs { font-size: 14px; color: var(--muted); }
.post > .crumbs { display: block; padding-top: 32px; }
.crumbs a { color: var(--fg-2); }
.post-head { padding: 48px 0 32px; border-bottom: 1px solid var(--line); margin-bottom: 40px; }
.post-head .meta { margin-top: 20px; }
.post-grid { display: grid; gap: 48px; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 1000px) { .post-grid:has(.toc) { grid-template-columns: 240px minmax(0, 1fr); } }
.toc { font-size: 14px; }
@media (min-width: 1000px) { .toc { position: sticky; top: 96px; align-self: start; max-height: calc(100vh - 120px); overflow: auto; } }
@media (max-width: 999px) { .toc { border: 1px solid var(--line); border-radius: 16px; padding: 16px 20px; } }
.toc ol { list-style: none; padding: 0; margin: 12px 0 0; display: grid; gap: 8px; }
.toc a { color: var(--fg-2); }
.toc a:hover { color: var(--fg); }

.prose { max-width: 72ch; font-size: 17px; color: #dfe3ec; }
.prose > p:first-child { font-size: 18px; color: var(--fg); background: var(--ink-2); border: 1px solid var(--line); border-left: 3px solid var(--signal); border-radius: 12px; padding: 18px 20px; }
.prose h2, .prose h3 { font-family: var(--display); letter-spacing: -0.02em; line-height: 1.2; color: var(--fg); }
.prose h2 { font-size: 1.75rem; margin: 56px 0 16px; }
.prose h3 { font-size: 1.25rem; margin: 36px 0 12px; }
.prose h2 a, .prose h3 a { color: inherit; }
.prose strong { color: var(--fg); }
.prose ul, .prose ol { padding-left: 1.4em; }
.prose li { margin: 6px 0; }
.prose li::marker { color: var(--signal); }
.prose blockquote { margin: 24px 0; padding: 4px 20px; border-left: 3px solid var(--violet); color: var(--fg-2); }
.prose code { font: 0.88em var(--mono); background: var(--ink-3); padding: 2px 6px; border-radius: 6px; }
.prose pre { background: var(--ink-1); border: 1px solid var(--line); border-radius: 12px; padding: 16px; overflow-x: auto; font-size: 14px; }
.prose pre code { background: none; padding: 0; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0; }
.table-wrap { overflow-x: auto; margin: 24px 0; border: 1px solid var(--line); border-radius: 12px; }
.prose table { border-collapse: collapse; width: 100%; font-size: 15px; }
.prose th, .prose td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
.prose th { background: var(--ink-2); color: var(--fg); font-weight: 600; }
.prose tr:last-child td { border-bottom: 0; }
.diagram { margin: 32px 0; padding: 20px; background: var(--ink-1); border: 1px solid var(--line); border-radius: 16px; }
.diagram svg { display: block; width: 100%; height: auto; }
.diagram figcaption { color: var(--muted); font-size: 14px; margin-top: 12px; text-align: center; }

.faq details { border: 1px solid var(--line); border-radius: 12px; padding: 14px 18px; margin: 10px 0; background: var(--ink-2); }
.faq summary { cursor: pointer; font-weight: 600; color: var(--fg); }
.faq details p { margin: 10px 0 0; color: var(--fg-2); }
.sources ol { font-size: 15px; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 40px; }
.tags span { font: 13px var(--mono); color: var(--muted); }
.related { margin-top: 80px; padding-top: 40px; border-top: 1px solid var(--line); }
.related h2 { font: 600 1.5rem var(--display); margin: 0 0 24px; }