/* Gatesmith site styles. The simulator pages add sim.css on top; marketing pages use .page-site. */
:root {
  color-scheme: dark;
  --bg: #0e1218;
  --board: #121722;
  --panel: #171c26;
  --line: #2c3548;
  --text: #e7ecf3;
  --muted: #93a0b5;
  --hi: #3ee0a0;
  --hi-ink: #06281c;
  --lo: #5c6b82;
  --x: #f5c451;
  --accent: #7aa2ff;
  --dot: #2a3346;
  --max: 1040px;
}

/* ---------- shared nav ---------- */
.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 16px;
  background: #0b0f15;
  border-bottom: 1px solid var(--line);
  font: 14px/1.4 "Segoe UI", system-ui, sans-serif;
}
.site-nav .brand { display: inline-flex; align-items: center; gap: 8px; color: var(--text); text-decoration: none; font-weight: 750; letter-spacing: 0.01em; font-size: 16px; }
.site-nav .logo { width: 26px; height: 26px; fill: none; stroke: var(--accent); stroke-width: 2.4; stroke-linejoin: round; stroke-linecap: round; }
.site-nav .logo circle { fill: #0b0f15; }
.site-nav .links { display: flex; flex-wrap: wrap; gap: 4px 6px; }
.site-nav .links a { color: var(--muted); text-decoration: none; padding: 6px 10px; border-radius: 8px; }
.site-nav .links a:hover { color: var(--text); background: var(--panel); }
.site-nav .links a[aria-current="page"] { color: var(--text); background: var(--panel); }
.site-nav .links a.up { color: var(--lo); margin-right: 6px; padding-right: 12px; border-right: 1px solid var(--line); border-radius: 8px 0 0 8px; }
.site-nav .links a.up::before { content: "\2039  "; }
.site-nav .links a.up:hover { color: var(--text); background: transparent; }

/* ---------- ad containers (collapse until filled by site.js) ---------- */
.ad-slot { display: block; margin: 16px auto; text-align: center; }
.ad-slot:empty { display: none; }
.ad-slot.active { min-height: 100px; }
.ad-slot .ad-label { display: block; font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--lo); margin-bottom: 4px; }

/* ---------- marketing / article pages ---------- */
.page-site { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.55 "Segoe UI", system-ui, sans-serif; }
.page-site * { box-sizing: border-box; }
.page-site a { color: var(--accent); }
.site-main { max-width: var(--max); margin: 0 auto; padding: 24px 16px 40px; }
.site-main.narrow { max-width: 760px; }

.hero { padding: 40px 0 24px; display: grid; grid-template-columns: 1.2fr 1fr; gap: 32px; align-items: center; }
.hero h1 { font-size: clamp(30px, 5vw, 46px); line-height: 1.1; margin: 0 0 14px; letter-spacing: -0.01em; }
.hero p.lead { font-size: 18px; color: var(--muted); margin: 0 0 22px; }
.kicker { display: inline-block; font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); font-weight: 700; margin-bottom: 10px; }
.cta-row { display: flex; flex-wrap: wrap; gap: 10px; }
.btn { display: inline-block; padding: 11px 18px; border-radius: 10px; border: 1px solid var(--line); background: var(--panel); color: var(--text); text-decoration: none; font-weight: 650; }
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); color: #0b1430; border-color: var(--accent); }
.btn.primary:hover { filter: brightness(1.08); }

.teaser { background: var(--panel); border: 1px solid var(--line); border-radius: 16px; padding: 18px 20px; }
.teaser .t-kicker { font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); font-weight: 700; }
.teaser h2 { margin: 6px 0 6px; font-size: 22px; }
.teaser p { margin: 0 0 10px; color: var(--muted); }
.teaser .t-meta { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { border: 1px solid var(--line); border-radius: 999px; padding: 2px 10px; font-size: 12.5px; color: var(--text); background: #1a2130; }
.chip.easy { color: var(--hi); } .chip.hard { color: var(--x); }

section.block { padding: 28px 0; border-top: 1px solid var(--line); }
section.block h2 { font-size: 24px; margin: 0 0 6px; }
section.block p.sub { color: var(--muted); margin: 0 0 18px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px; }
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 14.5px; }
.card .num { display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; background: var(--board); color: var(--accent); font-weight: 800; margin-bottom: 10px; border: 1px solid var(--line); }
.card a { text-decoration: none; }
.card a:hover { text-decoration: underline; }

.forge-box { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items: start; }
.forge-box ul { margin: 0; padding-left: 18px; color: var(--muted); }
.forge-box li { margin-bottom: 6px; }
.diagram { background: var(--board); border: 1px solid var(--line); border-radius: 14px; padding: 14px 16px; font: 13px/1.5 Consolas, "Cascadia Mono", monospace; color: var(--muted); white-space: pre; overflow: auto; }
.diagram b { color: var(--text); font-weight: 600; }

/* articles */
.prose { max-width: 72ch; }
.prose h1 { font-size: clamp(28px, 4vw, 38px); line-height: 1.15; margin: 8px 0 10px; }
.prose h2 { font-size: 22px; margin: 28px 0 8px; }
.prose h3 { font-size: 17px; margin: 20px 0 6px; }
.prose p, .prose li { color: #d3dae6; }
.prose .meta { color: var(--muted); font-size: 14px; margin-bottom: 18px; }
.prose code, .prose kbd { font-family: Consolas, "Cascadia Mono", monospace; font-size: 0.92em; background: var(--panel); border: 1px solid var(--line); border-radius: 5px; padding: 1px 5px; }
.prose table { border-collapse: collapse; font-family: Consolas, "Cascadia Mono", monospace; font-size: 14px; margin: 12px 0 16px; }
.prose th, .prose td { border: 1px solid var(--line); padding: 4px 12px; text-align: center; }
.prose th { background: var(--panel); color: var(--muted); font-weight: 650; }
.prose .try { background: var(--panel); border: 1px solid var(--line); border-left: 3px solid var(--accent); border-radius: 10px; padding: 12px 16px; margin: 16px 0; }
.prose .try p { margin: 0; }
.prose blockquote { margin: 14px 0; padding: 8px 14px; border-left: 3px solid var(--x); color: var(--muted); }
.toc { list-style: none; padding: 0; display: grid; gap: 10px; }
.toc li { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px; }
.toc li a { font-weight: 650; text-decoration: none; font-size: 17px; }
.toc li p { margin: 4px 0 0; color: var(--muted); font-size: 14px; }

.notice { background: #2a2416; border: 1px solid #5a4a1f; color: #f1e3b3; border-radius: 10px; padding: 10px 14px; font-size: 14px; }

.site-footer { border-top: 1px solid var(--line); margin-top: 20px; padding: 22px 16px 36px; color: var(--muted); font-size: 14px; }
.site-footer .inner { max-width: var(--max); margin: 0 auto; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px 20px; }
.site-footer a { color: var(--muted); text-decoration: none; margin-right: 14px; }
.site-footer a:hover { color: var(--text); }
.site-footer-links a { color: var(--accent); text-decoration: none; }

.big404 { text-align: center; padding: 60px 0; }
.big404 h1 { font-size: 72px; margin: 0; color: var(--accent); }

@media (max-width: 820px) {
  .hero { grid-template-columns: 1fr; padding-top: 24px; }
  .forge-box { grid-template-columns: 1fr; }
}