:root {
  --bg: #0b1120;
  --bg-soft: #111a2e;
  --panel: #ffffff;
  --ink: #0b1120;
  --ink-soft: #475569;
  --line: #e2e8f0;
  --brand: #4f46e5;
  --brand-soft: #eef2ff;
  --accent: #06b6d4;
  --ok: #16a34a;
  --warn: #b45309;
  --radius: 14px;
  --maxw: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: #f8fafc;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---- Top nav ---- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.9);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav .wrap { display: flex; align-items: center; gap: 28px; height: 64px; }
.logo { display: flex; align-items: center; gap: 9px; font-weight: 700; font-size: 17px; color: var(--ink); }
.logo .dot { width: 22px; height: 22px; border-radius: 6px; background: linear-gradient(135deg, var(--brand), var(--accent)); }
.nav nav { display: flex; gap: 22px; margin-left: 8px; }
.nav nav a { color: var(--ink-soft); font-size: 15px; font-weight: 500; }
.nav nav a:hover { color: var(--ink); text-decoration: none; }
.nav .spacer { flex: 1; }
.btn {
  display: inline-block; background: var(--brand); color: #fff;
  padding: 9px 16px; border-radius: 9px; font-weight: 600; font-size: 14px;
  border: none; cursor: pointer;
}
.btn:hover { background: #4338ca; text-decoration: none; color: #fff; }
.btn.ghost { background: transparent; color: var(--brand); border: 1px solid var(--line); }
.btn.lg { padding: 13px 24px; font-size: 16px; }

/* ---- Hero ---- */
.hero { background: linear-gradient(180deg, #0b1120, #1e293b); color: #fff; padding: 84px 0 96px; }
.hero h1 { font-size: 46px; line-height: 1.1; margin: 0 0 18px; letter-spacing: -0.02em; max-width: 18ch; }
.hero p.lead { font-size: 20px; color: #cbd5e1; max-width: 56ch; margin: 0 0 30px; }
.hero .cta-row { display: flex; gap: 14px; flex-wrap: wrap; }
.eyebrow { text-transform: uppercase; letter-spacing: 0.12em; font-size: 12px; font-weight: 700; color: var(--accent); margin-bottom: 14px; }

/* ---- Sections ---- */
section.block { padding: 72px 0; }
section.block.alt { background: #fff; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
h2 { font-size: 32px; letter-spacing: -0.01em; margin: 0 0 10px; }
.sub { color: var(--ink-soft); font-size: 17px; max-width: 60ch; margin: 0 0 38px; }

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.grid.two { grid-template-columns: repeat(2, 1fr); }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; }
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--ink-soft); font-size: 15px; }
.card .ic { width: 40px; height: 40px; border-radius: 10px; background: var(--brand-soft); display: flex; align-items: center; justify-content: center; font-size: 20px; margin-bottom: 16px; }

/* ---- Pricing ---- */
.tiers { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; align-items: stretch; }
.tier { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 30px; display: flex; flex-direction: column; }
.tier.feat { border: 2px solid var(--brand); box-shadow: 0 12px 40px rgba(79,70,229,0.15); }
.tier .price { font-size: 40px; font-weight: 800; margin: 12px 0 4px; }
.tier .price span { font-size: 15px; font-weight: 500; color: var(--ink-soft); }
.tier ul { list-style: none; padding: 0; margin: 18px 0 26px; }
.tier li { padding: 7px 0; border-bottom: 1px dashed var(--line); font-size: 15px; color: var(--ink-soft); }
.tier li::before { content: "✓"; color: var(--ok); font-weight: 700; margin-right: 9px; }
.tier .btn { margin-top: auto; text-align: center; }
.badge { align-self: flex-start; background: var(--brand-soft); color: var(--brand); font-size: 12px; font-weight: 700; padding: 4px 10px; border-radius: 999px; text-transform: uppercase; letter-spacing: 0.08em; }

/* ---- Resources / blog ---- */
.posts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.post { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.post .thumb { height: 130px; background: linear-gradient(135deg, var(--brand), var(--accent)); }
.post .body { padding: 20px; }
.post .tag { font-size: 12px; font-weight: 700; color: var(--accent); text-transform: uppercase; letter-spacing: 0.08em; }
.post h3 { margin: 8px 0; font-size: 17px; }
.post p { margin: 0; color: var(--ink-soft); font-size: 14px; }

/* ---- Demo / form page ---- */
.demo-split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.form-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 32px; }
#inflection-form { min-height: 120px; }
.form-placeholder { border: 2px dashed var(--line); border-radius: 12px; padding: 24px; color: var(--ink-soft); background: #f8fafc; }
.form-placeholder strong { color: var(--ink); display: block; margin-bottom: 6px; }
.form-placeholder code { background: #eef2ff; color: var(--brand); padding: 1px 6px; border-radius: 5px; font-size: 13px; }

#demo-form .field { margin-bottom: 16px; }
#demo-form .row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
#demo-form label { display: block; font-size: 13px; font-weight: 600; color: var(--ink); margin-bottom: 6px; }
#demo-form input { width: 100%; padding: 11px 13px; border: 1px solid var(--line); border-radius: 9px; font-size: 15px; font-family: var(--font); }
#demo-form input:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px var(--brand-soft); }
#demo-form button { margin-top: 8px; }
.form-msg { font-size: 14px; margin: 14px 0 0; min-height: 18px; }
.form-msg.ok { color: var(--ok); }
.form-msg.err { color: #dc2626; }

.track-chip { display: inline-block; font-size: 12px; font-weight: 700; padding: 5px 12px; border-radius: 999px; }
.track-chip.on { background: #dcfce7; color: var(--ok); }
.track-chip.off { background: #fef3c7; color: var(--warn); }

/* ---- Footer ---- */
footer { background: #0b1120; color: #94a3b8; padding: 48px 0; margin-top: 0; font-size: 14px; }
footer .wrap { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
footer a { color: #cbd5e1; }
footer .cols { display: flex; gap: 56px; flex-wrap: wrap; }
footer .col h4 { color: #fff; font-size: 13px; text-transform: uppercase; letter-spacing: 0.08em; margin: 0 0 12px; }
footer .col a { display: block; margin-bottom: 8px; }

.demo-note { background: #fffbeb; border: 1px solid #fde68a; color: #92400e; font-size: 13px; padding: 10px 14px; border-radius: 9px; text-align: center; }

@media (max-width: 860px) {
  .grid, .grid.two, .tiers, .posts, .demo-split { grid-template-columns: 1fr; }
  .hero h1 { font-size: 34px; }
  .nav nav { display: none; }
}