:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --ink: #16161d;
  --muted: #5d5d6b;
  --line: #e7e4dc;
  --brand: #3b2fd6;
  --brand-ink: #ffffff;
  --brand-soft: #eeecff;
  --accent: #e8a33d;
  --ok: #1f7a4d;
  --radius: 14px;
  --max: 1080px;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111118;
    --surface: #1a1a24;
    --ink: #f1f0f5;
    --muted: #a5a4b4;
    --line: #2c2c3a;
    --brand: #8b83ff;
    --brand-ink: #111118;
    --brand-soft: #25234a;
    --accent: #f0b95e;
    --ok: #5fd39a;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  font-size: 17px;
}
a { color: var(--brand); }
img, svg { max-width: 100%; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header { border-bottom: 1px solid var(--line); }
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px; gap: 16px;
}
.logo {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 800; font-size: 20px; letter-spacing: -0.02em;
  color: var(--ink); text-decoration: none;
}
.logo-mark {
  width: 30px; height: 30px; border-radius: 8px;
  background: var(--brand); color: var(--brand-ink);
  display: grid; place-items: center; font-size: 17px; font-weight: 900;
}
.nav { display: flex; gap: 18px; align-items: center; font-size: 15px; }
.nav a { color: var(--muted); text-decoration: none; }
.nav a:hover { color: var(--ink); }

/* Hero */
.hero { padding: 88px 0 64px; }
.eyebrow {
  display: inline-block; font-size: 13px; font-weight: 700;
  letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--brand); background: var(--brand-soft);
  padding: 6px 12px; border-radius: 999px; margin-bottom: 22px;
}
h1 {
  font-size: clamp(34px, 5.4vw, 58px); line-height: 1.08;
  letter-spacing: -0.03em; margin: 0 0 20px; max-width: 16ch;
}
h2 { font-size: clamp(26px, 3.4vw, 36px); letter-spacing: -0.02em; line-height: 1.15; margin: 0 0 14px; }
h3 { font-size: 19px; margin: 0 0 6px; letter-spacing: -0.01em; }
.lead { font-size: clamp(18px, 2vw, 21px); color: var(--muted); max-width: 60ch; margin: 0 0 32px; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 22px; border-radius: 10px; font-weight: 700; font-size: 16px;
  text-decoration: none; border: 1px solid transparent; cursor: pointer;
}
.btn-primary { background: var(--brand); color: var(--brand-ink); }
.btn-primary:hover { filter: brightness(1.08); }
.btn-ghost { border-color: var(--line); color: var(--ink); background: var(--surface); }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; }
.fine { font-size: 14px; color: var(--muted); margin-top: 14px; }

/* Sections */
section { padding: 56px 0; }
.section-alt { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-intro { color: var(--muted); max-width: 62ch; margin: 0 0 32px; }

.grid { display: grid; gap: 18px; }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }

.card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 24px;
}
.section-alt .card { background: var(--bg); }
.step-num {
  width: 34px; height: 34px; border-radius: 50%;
  background: var(--brand-soft); color: var(--brand);
  display: grid; place-items: center; font-weight: 800; margin-bottom: 14px;
}
.card p { margin: 0; color: var(--muted); }

/* Evidence callout */
.evidence {
  border-left: 4px solid var(--accent);
  background: var(--surface); border-radius: 0 var(--radius) var(--radius) 0;
  padding: 22px 24px; max-width: 760px;
}
.evidence code, .quote-tag {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 15px; background: var(--brand-soft); color: var(--ink);
  padding: 2px 8px; border-radius: 6px;
}

/* Lead sample */
.lead-card { position: relative; }
.lead-card .tag {
  position: absolute; top: 16px; right: 16px;
  font-size: 12px; font-weight: 700; color: var(--muted);
  border: 1px dashed var(--line); padding: 3px 8px; border-radius: 999px;
}
.lead-card dl { display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; margin: 14px 0 0; font-size: 15px; }
.lead-card dt { color: var(--muted); }
.lead-card dd { margin: 0; }
.status-ok { color: var(--ok); font-weight: 700; }

/* List */
.checklist { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.checklist li { padding-left: 30px; position: relative; }
.checklist li::before {
  content: "✓"; position: absolute; left: 0; top: 0;
  width: 20px; height: 20px; border-radius: 50%;
  background: var(--brand-soft); color: var(--brand);
  font-size: 13px; font-weight: 800; display: grid; place-items: center; margin-top: 3px;
}

/* FAQ */
details { border-bottom: 1px solid var(--line); padding: 16px 0; }
details summary { cursor: pointer; font-weight: 700; list-style: none; }
details summary::-webkit-details-marker { display: none; }
details summary::after { content: "+"; float: right; color: var(--muted); font-weight: 400; }
details[open] summary::after { content: "–"; }
details p { color: var(--muted); margin: 10px 0 0; }

/* CTA band */
.cta-band {
  background: var(--brand); color: var(--brand-ink);
  border-radius: 20px; padding: 44px 32px; text-align: center;
}
.cta-band h2 { color: var(--brand-ink); }
.cta-band p { opacity: 0.9; max-width: 56ch; margin: 0 auto 26px; }
.cta-band .btn-primary { background: var(--brand-ink); color: var(--brand); }

/* Footer */
.site-footer { border-top: 1px solid var(--line); padding: 32px 0 48px; font-size: 14px; color: var(--muted); }
.site-footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; }
.site-footer a { color: var(--muted); }

@media (max-width: 600px) {
  body { font-size: 16px; }
  .hero { padding: 56px 0 40px; }
  section { padding: 40px 0; }
  .nav .hide-sm { display: none; }
  .cta-band { padding: 32px 20px; }
  .lead-card .tag { position: static; display: inline-block; margin-bottom: 8px; }
  .lead-card dl { grid-template-columns: 1fr; gap: 2px; }
  .lead-card dd { margin-bottom: 8px; }
}