/* BraidEra landing page — dependency-free, responsive.
   Design tokens up top so a future app can share the palette. */
:root {
  --bg: #0b1020;
  --bg-2: #0e1530;
  --panel: #131a36;
  --panel-2: #172044;
  --text: #e8ecf8;
  --muted: #9aa6c8;
  --line: rgba(148, 163, 210, 0.16);
  --cyan: #6ee7ff;
  --violet: #a78bfa;
  --amber: #fbbf24;
  --radius: 16px;
  --maxw: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: radial-gradient(1200px 600px at 70% -10%, #1a2350 0%, var(--bg) 55%) no-repeat, var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.15; letter-spacing: -0.02em; }
.grad {
  background: linear-gradient(90deg, var(--cyan), var(--violet));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

.skip-link {
  position: absolute; left: -999px; top: 0; background: var(--panel);
  padding: 10px 16px; border-radius: 8px; z-index: 100;
}
.skip-link:focus { left: 16px; top: 16px; }

/* Header / nav */
.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(10px);
  background: rgba(11, 16, 32, 0.72);
  border-bottom: 1px solid var(--line);
}
.nav {
  max-width: var(--maxw); margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); font-weight: 700; }
.brand:hover { text-decoration: none; }
.brand-name { font-size: 1.15rem; letter-spacing: -0.02em; }
.nav-links { display: flex; align-items: center; gap: 22px; }
.nav-links a { color: var(--muted); font-size: 0.95rem; }
.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav-cta {
  border: 1px solid var(--line); padding: 8px 16px; border-radius: 999px; color: var(--text) !important;
}
.nav-cta:hover { border-color: var(--cyan); }

/* Buttons */
.btn {
  display: inline-block; padding: 12px 22px; border-radius: 999px; font-weight: 600;
  transition: transform .12s ease, box-shadow .12s ease, background .12s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary {
  color: #07101f; background: linear-gradient(90deg, var(--cyan), var(--violet));
  box-shadow: 0 8px 30px rgba(110, 231, 255, 0.18);
}
.btn-ghost { color: var(--text); border: 1px solid var(--line); }
.btn-ghost:hover { border-color: var(--cyan); }
.btn-lg { padding: 15px 30px; font-size: 1.05rem; }

/* Hero */
.hero { position: relative; overflow: hidden; }
.hero-inner { max-width: var(--maxw); margin: 0 auto; padding: 96px 24px 72px; position: relative; z-index: 2; }
.eyebrow { color: var(--muted); text-transform: uppercase; letter-spacing: 0.14em; font-size: 0.8rem; margin: 0 0 18px; }
.hero h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); margin: 0 0 22px; max-width: 16ch; }
.lede { color: var(--muted); font-size: clamp(1.05rem, 2vw, 1.25rem); max-width: 60ch; margin: 0 0 30px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }
.hero-note { color: var(--muted); font-size: 0.9rem; margin-top: 22px; }
.hero-glow {
  position: absolute; inset: -20% 30% auto auto; width: 620px; height: 620px;
  background: radial-gradient(closest-side, rgba(167,139,250,0.28), transparent 70%);
  filter: blur(20px); z-index: 1;
}

/* Sections */
.section { max-width: var(--maxw); margin: 0 auto; padding: 80px 24px; }
.section-alt { background: linear-gradient(180deg, transparent, var(--bg-2) 12%, var(--bg-2) 88%, transparent); max-width: none; }
.section-alt .split { max-width: var(--maxw); margin: 0 auto; }
.section-head { text-align: center; margin-bottom: 48px; }
.section-head h2 { font-size: clamp(1.8rem, 3.5vw, 2.6rem); margin: 0 0 10px; }
.section-head p { color: var(--muted); margin: 0; }

.band { max-width: var(--maxw); margin: 0 auto; padding: 24px 24px 0; }
.grid { display: grid; gap: 20px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.card {
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid var(--line); border-radius: var(--radius); padding: 26px;
}
.card h3 { margin: 0 0 10px; font-size: 1.2rem; }
.card p { color: var(--muted); margin: 0; }

/* Steps */
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; counter-reset: s; }
.steps li { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; position: relative; }
.step-num {
  display: inline-flex; align-items: center; justify-content: center; width: 38px; height: 38px;
  border-radius: 10px; font-weight: 700; color: #07101f; margin-bottom: 14px;
  background: linear-gradient(135deg, var(--cyan), var(--violet));
}
.steps h3 { margin: 0 0 8px; font-size: 1.15rem; }
.steps p { color: var(--muted); margin: 0; }

/* Split */
.split { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 48px; align-items: center; padding: 80px 24px; }
.split h2 { font-size: clamp(1.8rem, 3.5vw, 2.4rem); margin: 0 0 16px; }
.split > div > p { color: var(--muted); }
.checklist { list-style: none; padding: 0; margin: 20px 0 0; display: grid; gap: 12px; }
.checklist li { padding-left: 30px; position: relative; color: var(--text); }
.checklist li::before {
  content: ""; position: absolute; left: 0; top: 7px; width: 16px; height: 16px; border-radius: 50%;
  background: linear-gradient(135deg, var(--cyan), var(--violet));
}
.evidence-card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; }
.ev-row { display: flex; justify-content: space-between; align-items: center; font-weight: 600; }
.ev-tag { font-size: 0.75rem; padding: 4px 10px; border-radius: 999px; }
.ev-amber { background: rgba(251,191,36,0.15); color: var(--amber); border: 1px solid rgba(251,191,36,0.4); }
.ev-bar { height: 8px; background: rgba(255,255,255,0.06); border-radius: 999px; margin: 16px 0; overflow: hidden; }
.ev-bar i { display: block; height: 100%; background: linear-gradient(90deg, var(--cyan), var(--violet)); }
.ev-meta { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.ev-meta div { display: flex; flex-direction: column; }
.ev-meta b { font-size: 0.75rem; color: var(--muted); font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; }
.ev-meta span { font-size: 0.9rem; }

/* Layers */
.layers { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.layer { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px; display: flex; align-items: baseline; gap: 12px; }
.layer b { color: var(--cyan); font-size: 1.1rem; min-width: 30px; }
.layer span { color: var(--muted); }

/* CTA */
.cta { max-width: none; background: linear-gradient(180deg, transparent, var(--bg-2)); padding: 90px 24px; text-align: center; }
.cta-inner { max-width: 680px; margin: 0 auto; }
.cta h2 { font-size: clamp(2rem, 4vw, 3rem); margin: 0 0 14px; }
.cta p { color: var(--muted); font-size: 1.1rem; margin: 0 0 28px; }
.cta-sub { font-size: 0.95rem; margin-top: 20px; }

/* Footer */
.site-footer { border-top: 1px solid var(--line); background: var(--bg-2); }
.footer-inner { max-width: var(--maxw); margin: 0 auto; padding: 48px 24px 28px; display: flex; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.footer-brand p { color: var(--muted); margin: 8px 0 0; }
.footer-links { display: flex; gap: 22px; flex-wrap: wrap; align-items: flex-start; }
.footer-links a { color: var(--muted); }
.footer-links a:hover { color: var(--text); text-decoration: none; }
.footer-bar { border-top: 1px solid var(--line); }
.footer-bar p { max-width: var(--maxw); margin: 0 auto; padding: 18px 24px; color: var(--muted); font-size: 0.85rem; }

/* Responsive */
@media (max-width: 860px) {
  .grid-3, .steps, .layers { grid-template-columns: 1fr; }
  .split { grid-template-columns: 1fr; gap: 28px; padding: 56px 24px; }
  .nav-links a:not(.nav-cta) { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn:hover { transform: none; }
}