/* Public site (vbrain.vanshul.com) — landing + rendered note pages.
   Standalone from the app's styles.css; optimized for reading + Core Web Vitals
   (system fonts, no layout shift, high contrast). */

:root {
  --bg: #0c0d12; --panel: #14161f; --line: #232636; --fg: #e7e9ee;
  --muted: #9aa3b2; --accent: #3ddc97; --accent-dim: #2a9c6d; --link: #7cc4ff;
  --maxw: 46rem;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  text-rendering: optimizeLegibility; -webkit-font-smoothing: antialiased;
}
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
img, svg { max-width: 100%; height: auto; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 1.25rem; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 1rem; top: 1rem; background: var(--accent); color: #05130c; padding: .5rem .75rem; border-radius: 6px; z-index: 10; }

/* header / nav */
.site-nav { border-bottom: 1px solid var(--line); position: sticky; top: 0; background: rgba(12,13,18,.85); backdrop-filter: blur(8px); z-index: 5; }
.site-nav .wrap { display: flex; align-items: center; gap: 1rem; height: 54px; }
.site-nav .brand { display: flex; align-items: center; gap: .5rem; font-weight: 650; color: var(--fg); }
.site-nav .brand svg { width: 22px; height: 22px; color: var(--accent); }
.site-nav .spacer { flex: 1; }
.site-nav a.navlink { color: var(--muted); font-size: .92rem; }
.site-nav a.navlink:hover { color: var(--fg); text-decoration: none; }

/* hero */
.hero { padding: 4rem 0 2.5rem; border-bottom: 1px solid var(--line); }
.hero h1 { font-size: clamp(2rem, 5vw, 3rem); line-height: 1.1; margin: 0 0 1rem; letter-spacing: -0.02em; }
.hero p.lede { font-size: 1.15rem; color: var(--muted); margin: 0 0 1.75rem; }
.cta { display: flex; flex-wrap: wrap; gap: .75rem; }
.btn { display: inline-block; padding: .6rem 1.1rem; border-radius: 9px; font-weight: 600; border: 1px solid var(--line); color: var(--fg); }
.btn.primary { background: var(--accent); color: #05130c; border-color: var(--accent); }
.btn:hover { text-decoration: none; border-color: var(--accent); }

/* feature grid */
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); gap: 1rem; padding: 2.5rem 0; }
.feature { border: 1px solid var(--line); border-radius: 12px; padding: 1.1rem; background: var(--panel); }
.feature h3 { margin: 0 0 .4rem; font-size: 1.05rem; }
.feature p { margin: 0; color: var(--muted); font-size: .95rem; }

/* prose (rendered markdown) */
.prose { padding: 2rem 0 3rem; }
.prose h1 { font-size: 2rem; line-height: 1.15; margin: 0 0 1rem; letter-spacing: -0.02em; }
.prose h2 { font-size: 1.4rem; margin: 2rem 0 .75rem; padding-top: .5rem; border-top: 1px solid var(--line); }
.prose h3 { font-size: 1.15rem; margin: 1.5rem 0 .5rem; }
.prose p, .prose li { color: #d7dae2; }
.prose blockquote { margin: 1rem 0; padding: .5rem 1rem; border-left: 3px solid var(--accent-dim); background: var(--panel); border-radius: 0 8px 8px 0; color: var(--muted); }
.prose code { background: #0f1118; border: 1px solid var(--line); border-radius: 5px; padding: .1rem .35rem; font-size: .9em; }
.prose pre { background: #0f1118; border: 1px solid var(--line); border-radius: 10px; padding: 1rem; overflow: auto; }
.prose pre code { background: none; border: 0; padding: 0; }
.prose table { border-collapse: collapse; width: 100%; margin: 1rem 0; display: block; overflow-x: auto; }
.prose th, .prose td { border: 1px solid var(--line); padding: .5rem .7rem; text-align: left; }
.prose th { background: var(--panel); }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 2rem 0; }

/* note index + breadcrumbs + backlinks */
.notes-index { padding: 1rem 0 3rem; }
.notes-index h2 { font-size: 1.3rem; margin: 0 0 1rem; }
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(16rem, 1fr)); gap: .8rem; list-style: none; padding: 0; margin: 0; }
.card-grid a { display: block; border: 1px solid var(--line); border-radius: 10px; padding: .9rem; background: var(--panel); color: var(--fg); height: 100%; }
.card-grid a:hover { border-color: var(--accent); text-decoration: none; }
.card-grid .t { font-weight: 600; margin-bottom: .25rem; }
.card-grid .d { color: var(--muted); font-size: .88rem; }
.crumbs { color: var(--muted); font-size: .85rem; padding: 1rem 0 0; }
.crumbs a { color: var(--muted); }
.backlinks { margin-top: 2.5rem; padding-top: 1rem; border-top: 1px solid var(--line); }
.backlinks h2 { font-size: 1rem; color: var(--muted); border: 0; padding: 0; margin: 0 0 .5rem; }

footer.site-foot { border-top: 1px solid var(--line); color: var(--muted); font-size: .9rem; padding: 2rem 0; }
footer.site-foot .wrap { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; }

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