/* GapGuard — shared design system (refined dark, single Bitget-cyan accent) */

:root {
  --bg: #0c0d10;
  --bg-2: #0e0f13;
  --surface: #141519;
  --surface-hi: #191b21;
  --line: #25272f;
  --line-soft: #1c1e25;
  --ink: #f3f4f6;
  --ink-2: #aeb2bc;
  --ink-3: #71757f;
  --accent: #00f0ff;
  --accent-ink: #02232a;
  --accent-wash: rgba(0, 240, 255, 0.10);
  --accent-line: rgba(0, 240, 255, 0.35);
  --alert: #ff5d5d;
  --alert-wash: rgba(255, 93, 93, 0.09);
  --alert-line: rgba(255, 93, 93, 0.40);
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas, monospace;
  --radius: 14px;
  --radius-sm: 9px;
  --maxw: 1120px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--sans); font-size: 15px; line-height: 1.6;
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { letter-spacing: -0.02em; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.mono { font-family: var(--mono); }

/* ---- Top navigation ---- */
.topbar {
  position: sticky; top: 0; z-index: 20;
  background: rgba(12, 13, 16, 0.82); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line-soft);
}
.topbar .inner {
  max-width: var(--maxw); margin: 0 auto; padding: 0 24px; height: 62px;
  display: flex; align-items: center; gap: 28px;
}
.brand { display: flex; align-items: center; gap: 11px; flex: none; }
.brand .mark { display: flex; }
.brand .mark img { height: 23px; width: auto; display: block; }
.brand .name { font-weight: 650; font-size: 16px; letter-spacing: -0.01em; color: var(--ink); }
.nav { display: flex; align-items: center; gap: 4px; margin-left: 8px; }
.nav a {
  color: var(--ink-2); font-size: 13.5px; font-weight: 500; padding: 7px 12px;
  border-radius: 8px; text-decoration: none;
}
.nav a:hover { color: var(--ink); background: var(--surface-hi); text-decoration: none; }
.nav a.active { color: var(--ink); background: var(--surface); }
.nav a.ext::after { content: " ↗"; color: var(--ink-3); }
.topbar .spacer { flex: 1; }
.built {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px; border: 1px solid var(--line); border-radius: 999px;
  font-size: 12px; color: var(--ink-2); white-space: nowrap; flex: none;
}
.built .mark { display: flex; }
.built .mark img { height: 13px; width: auto; display: block; }

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 20px; border-radius: var(--radius-sm); cursor: pointer;
  font-weight: 600; font-size: 14px; border: 1px solid transparent; text-decoration: none;
}
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { filter: brightness(1.07); text-decoration: none; }
.btn-ghost { border-color: var(--line); color: var(--ink); background: transparent; }
.btn-ghost:hover { background: var(--surface-hi); border-color: var(--accent-line); text-decoration: none; }

/* ---- Section scaffolding ---- */
.kicker {
  font-size: 11.5px; font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--accent); margin: 0 0 14px;
}
.section { padding: 64px 0; border-top: 1px solid var(--line-soft); }
.section h2 { font-size: 26px; margin: 0 0 12px; font-weight: 650; }
.section .lead { color: var(--ink-2); font-size: 16px; max-width: 64ch; margin: 0 0 36px; }

/* ---- Hero ---- */
.hero { padding: 76px 0 64px; }
.hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 56px; align-items: center; }
.hero h1 { font-size: 46px; line-height: 1.08; margin: 0 0 20px; font-weight: 680; }
.hero h1 .hl { color: var(--accent); }
.hero .lead { font-size: 18px; color: var(--ink-2); margin: 0 0 30px; max-width: 52ch; }
.hero .cta { display: flex; gap: 12px; flex-wrap: wrap; }
.hero .note { margin-top: 22px; color: var(--ink-3); font-size: 13px; font-family: var(--mono); }

/* hero visual — a faux decision card echoing the cockpit */
.glass-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; box-shadow: 0 24px 60px -30px rgba(0, 0, 0, 0.8);
}
.glass-card .gc-head {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 13px 16px; border-bottom: 1px solid var(--line);
}
.chip {
  display: inline-flex; align-items: center; gap: 7px; font-size: 12px; font-weight: 600;
  color: var(--accent); padding: 4px 10px; border: 1px solid var(--accent-line);
  border-radius: 999px; background: var(--accent-wash);
}
.chip .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 10px var(--accent); }
.gc-head .lbl { font-size: 12px; color: var(--ink-3); font-family: var(--mono); }
.gc-row { display: flex; justify-content: space-between; padding: 11px 16px; border-bottom: 1px solid var(--line-soft); font-size: 13px; }
.gc-row:last-child { border-bottom: none; }
.gc-row .k { color: var(--ink-3); }
.gc-row .v { font-family: var(--mono); color: var(--ink); }
.gc-row .v.accent { color: var(--accent); }

/* ---- The loop (stepper) ---- */
.loop { display: flex; flex-wrap: wrap; gap: 10px; align-items: stretch; }
.step {
  flex: 1 1 0; min-width: 150px; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius-sm); padding: 16px;
}
.step .n { font-family: var(--mono); font-size: 12px; color: var(--accent); }
.step h4 { margin: 8px 0 5px; font-size: 14px; font-weight: 600; }
.step p { margin: 0; font-size: 12.5px; color: var(--ink-3); line-height: 1.5; }

/* ---- Stat band ---- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.stat-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.stat-card .big { font-size: 30px; font-weight: 680; letter-spacing: -0.02em; font-family: var(--mono); }
.stat-card .lbl { color: var(--ink-3); font-size: 12.5px; margin-top: 6px; }
.stats-note { color: var(--ink-3); font-size: 12.5px; margin-top: 16px; }

/* ---- Feature / card grid ---- */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid.two { grid-template-columns: repeat(2, 1fr); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.card .ic { color: var(--accent); margin-bottom: 14px; display: flex; }
.card h3 { font-size: 16px; margin: 0 0 8px; font-weight: 600; }
.card p { margin: 0; color: var(--ink-2); font-size: 14px; }
.card .meta { margin-top: 14px; font-family: var(--mono); font-size: 12px; color: var(--ink-3); }

/* ---- Prose (how-it-works) ---- */
.prose { max-width: 760px; }
.prose h3 { font-size: 19px; margin: 38px 0 10px; }
.prose p { color: var(--ink-2); margin: 0 0 14px; }
.prose code { font-family: var(--mono); font-size: 0.88em; background: var(--surface-hi); border: 1px solid var(--line-soft); border-radius: 5px; padding: 1px 6px; color: var(--ink); }
.prose ul { color: var(--ink-2); padding-left: 20px; }
.prose li { margin: 7px 0; }
.callout {
  border: 1px solid var(--line); border-left: 3px solid var(--accent);
  background: var(--surface); border-radius: var(--radius-sm); padding: 16px 18px; margin: 22px 0;
  color: var(--ink-2); font-size: 14px;
}
.callout.warn { border-left-color: var(--alert); }
.callout b { color: var(--ink); }

/* ---- CTA band ---- */
.cta-band { text-align: center; padding: 64px 24px; }
.cta-band h2 { font-size: 26px; margin: 0 0 12px; }
.cta-band p { color: var(--ink-2); margin: 0 0 26px; }
.cta-band .cta { display: inline-flex; gap: 12px; flex-wrap: wrap; justify-content: center; }

/* ---- Footer ---- */
.site-footer { border-top: 1px solid var(--line-soft); margin-top: 8px; }
.site-footer .inner {
  max-width: var(--maxw); margin: 0 auto; padding: 28px 24px 56px;
  display: flex; align-items: center; justify-content: space-between; gap: 18px; flex-wrap: wrap;
  color: var(--ink-3); font-size: 13px;
}
.site-footer .fnav { display: flex; gap: 18px; flex-wrap: wrap; }
.site-footer .fnav a { color: var(--ink-2); }
.site-footer code { font-family: var(--mono); color: var(--ink-2); }

/* ---- Responsive ---- */
@media (max-width: 880px) {
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .hero h1 { font-size: 38px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .grid, .grid.two { grid-template-columns: 1fr; }
  .nav { display: none; }
}
@media (max-width: 560px) {
  .hero h1 { font-size: 31px; }
  .built span { display: none; }
}