:root {
  --paper:#fefffe; --ink:#1D1F1E; --shell:#2B2B2B; --citron:#DAE376;
  --flare:#ff6663; --sky:#bfd7ea;
}
* { box-sizing: border-box; }
html, body { margin:0; padding:0; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: "Newsreader", "Times New Roman", serif;
  -webkit-font-smoothing: antialiased;
}
.site-header {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 28px; background: rgba(254,255,254,0.9); backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(29,31,30,0.1);
}
.brand { display:inline-flex; align-items:center; gap:12px; text-decoration:none; color:var(--ink); }
.brand .mark {
  width: 32px; height: 32px;
  background: url("/mars-mark.svg") center/contain no-repeat;
  display: inline-block;
}
.brand .name { font-family:"Space Grotesk", sans-serif; font-weight:600; font-size:22px; letter-spacing:-0.04em; }
.brand .tag { font-family:"JetBrains Mono",monospace; font-size:10px; text-transform:uppercase; letter-spacing:0.18em; color:var(--ink); opacity:0.55; margin-top:6px; }
.topnav a { color: var(--ink); text-decoration: none; margin-left:24px; font-size:14px; font-weight:500; font-family:"Space Grotesk", sans-serif; }
.topnav a:hover { color: var(--flare); }

.layout { display: grid; grid-template-columns: 280px 1fr; max-width: 1400px; margin: 0 auto; min-height: calc(100vh - 60px); }
.sidebar {
  padding: 28px 16px 60px; border-right: 1px solid rgba(29,31,30,0.1);
  position: sticky; top: 60px; height: calc(100vh - 60px); overflow-y: auto;
  font-family: "Space Grotesk", sans-serif;
}
.nav-tab { font-family:"JetBrains Mono",monospace; font-size:10px; text-transform:uppercase; letter-spacing:0.18em; color: var(--flare); padding: 16px 12px 8px; }
.nav-group { font-family:"JetBrains Mono",monospace; font-size:10px; text-transform:uppercase; letter-spacing:0.18em; color: rgba(29,31,30,0.55); padding: 14px 12px 6px; }
.nav-link { display: block; padding: 6px 12px; color: var(--ink); text-decoration: none; border-radius: 4px; font-size:14px; }
.nav-link:hover { background: rgba(29,31,30,0.06); }
.nav-link.active { background: var(--ink); color: var(--citron); }

.content { padding: 48px 56px 96px; max-width: 880px; }
.content h1 { font-family:"Space Grotesk", sans-serif; font-weight:600; font-size: clamp(2.2rem, 5vw, 4rem); line-height:0.95; letter-spacing:-0.04em; margin: 0 0 16px; }
.lede { font-family:"Newsreader", serif; font-weight:300; font-size: clamp(1.1rem, 1.7vw, 1.4rem); color: rgba(29,31,30,0.75); margin: 0 0 32px; }
.prose { font-size: 17px; line-height: 1.65; font-family:"Newsreader", serif; }
.prose h2 { font-family:"Space Grotesk", sans-serif; font-weight:600; font-size: 2rem; margin: 56px 0 12px; letter-spacing:-0.02em; }
.prose h3 { font-family:"Space Grotesk", sans-serif; font-weight:500; font-size: 1.3rem; margin: 36px 0 8px; }
.prose p { margin: 14px 0; }
.prose a {
  color: var(--ink);
  text-decoration: none;
  background-image: linear-gradient(currentColor, currentColor);
  background-size: 100% 1px; background-repeat: no-repeat; background-position: 0 100%;
  transition: background-size .25s, color .25s;
}
.prose a:hover { background-size: 100% 0.18em; color: var(--flare); }
.prose ul, .prose ol { padding-left: 24px; }
.prose li { margin: 6px 0; }
.prose code { font-family:"JetBrains Mono",monospace; font-size: 0.92em; background: var(--citron); padding: 2px 6px; border-radius: 4px; color: var(--ink); }
.prose pre { background: var(--ink); color: var(--paper); padding: 18px 22px; border-radius: 12px; overflow-x:auto; font-size: 14px; line-height:1.55; }
.prose pre code { background: transparent; padding: 0; color: inherit; }
.prose table { border-collapse: collapse; margin: 18px 0; width: 100%; }
.prose th, .prose td { border: 1px solid rgba(29,31,30,0.15); padding: 10px 14px; text-align: left; }
.prose th { background: var(--citron); color: var(--ink); font-family:"JetBrains Mono",monospace; font-size: 12px; text-transform: uppercase; letter-spacing: 0.12em; }
.prose blockquote { border-left: 3px solid var(--flare); margin: 18px 0; padding: 4px 18px; color: rgba(29,31,30,0.8); }
.prose hr { border: 0; border-top: 1px solid rgba(29,31,30,0.15); margin: 36px 0; }

.cardgrid { display: grid; gap: 14px; margin: 18px 0 28px; }
.cardgrid.cols-2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.card { display: block; padding: 22px 24px; border: 2px solid var(--ink); border-radius: 18px; background: var(--paper); text-decoration: none; color: var(--ink); transition: transform .2s; }
.card:hover { transform: translateY(-3px); background: var(--citron); }
.card h3 { font-family:"Space Grotesk",sans-serif; font-weight:600; margin: 0 0 8px; }
.card-arrow { color: var(--flare); }

.page-footer { margin-top: 64px; padding-top: 24px; border-top: 1px solid rgba(29,31,30,0.15); }
.hot { color: var(--flare); text-decoration: underline; text-underline-offset: 3px; }

@media (max-width: 880px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: static; height: auto; border-right: none; border-bottom: 1px solid rgba(29,31,30,0.1); }
  .content { padding: 28px 24px 64px; }
}