:root {
  --ink: #1B1426;
  --ink-2: #4A3F5C;
  --ink-3: #897A9E;
  --ink-4: #C7BCD8;
  --bg: #FBF9FF;
  --bg-2: #F4EEFF;
  --line: #ECE3F7;
  --card: #FFFFFF;
  --purple: #6B3FD4;
  --purple-deep: #4A1FB0;
  --purple-soft: #EDE3FF;
  --purple-tint: #F7F1FF;
  --brand-blue: #2D43E0;
  --brand-orange: #FF6B47;
}
* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  font-family: 'Geist', system-ui, -apple-system, sans-serif;
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  line-height: 1.55;
}
a { color: inherit; text-decoration: none; }

/* ── Nav ── */
.nav-wrap {
  position: sticky; top: 0; z-index: 50;
  background: rgba(251, 249, 255, 0.85);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid rgba(0,0,0,0.04);
}
.nav {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 32px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; }
.brand-word { font-weight: 700; font-size: 19px; letter-spacing: -0.02em; }
.nav-links {
  display: inline-flex; align-items: center; gap: 30px;
  font-size: 14px; color: var(--ink-2); font-weight: 500;
}
.nav-links a:hover { color: var(--ink); }
.nav-cta { display: inline-flex; align-items: center; gap: 8px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  font: inherit; font-size: 14px; font-weight: 600;
  border-radius: 10px; cursor: pointer; border: none;
  transition: all 0.15s ease;
  white-space: nowrap;
}
.btn.ghost { background: transparent; color: var(--ink); }
.btn.ghost:hover { background: rgba(0,0,0,0.04); }
.btn.primary { background: var(--ink); color: white; }
.btn.primary:hover { background: #000; transform: translateY(-1px); }
.btn.big { padding: 14px 26px; font-size: 15px; border-radius: 12px; }
.btn.purple {
  background: var(--purple); color: white;
  box-shadow: 0 10px 24px -10px var(--purple);
}
.btn.purple:hover { background: var(--purple-deep); transform: translateY(-1px); }
.btn.white { background: white; color: var(--ink); }
.btn.outline {
  background: transparent; color: var(--ink);
  border: 1px solid var(--line);
}
.btn.outline:hover { background: rgba(0,0,0,0.03); }

/* ── Page hero ── */
.page-hero {
  position: relative; overflow: hidden;
  padding: 80px 32px 56px;
  border-bottom: 1px solid var(--line);
}
.page-hero::before {
  content: '';
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 18% 28%, rgba(107,63,212,0.10), transparent 50%),
    radial-gradient(circle at 88% 18%, rgba(255,107,71,0.08), transparent 55%);
  pointer-events: none;
}
.page-hero-inner {
  max-width: 880px; margin: 0 auto; position: relative;
}
.crumb {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: 'Geist Mono', monospace;
  font-size: 12px;
  color: var(--ink-3);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.crumb a:hover { color: var(--purple); }
.crumb .sep { color: var(--ink-4); }
.page-hero h1 {
  margin: 0 0 14px;
  font-family: 'Instrument Serif', serif;
  font-weight: 400;
  font-size: 56px;
  line-height: 1.04;
  letter-spacing: -0.02em;
}
.page-hero h1 em { color: var(--purple); font-style: italic; }
.page-hero .lede {
  margin: 0;
  font-size: 18px;
  color: var(--ink-2);
  line-height: 1.55;
  max-width: 640px;
}
.page-hero .stamps {
  display: inline-flex; gap: 8px; flex-wrap: wrap;
  margin-top: 20px;
  font-family: 'Geist Mono', monospace;
  font-size: 11.5px;
  color: var(--ink-3);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.page-hero .stamps .stamp {
  background: white;
  border: 1px solid var(--line);
  padding: 5px 11px;
  border-radius: 999px;
}

/* ── Page body ── */
.page-body {
  max-width: 880px;
  margin: 0 auto;
  padding: 64px 32px 80px;
}
.page-body.has-toc {
  max-width: 1180px;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 56px;
  align-items: start;
}
.toc {
  position: sticky; top: 90px;
  font-size: 13.5px;
  border-left: 1px solid var(--line);
  padding-left: 18px;
}
.toc-label {
  display: block;
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 12px;
  font-weight: 700;
}
.toc a {
  display: block;
  padding: 5px 0;
  color: var(--ink-2);
}
.toc a:hover { color: var(--purple); }

.prose h2 {
  font-family: 'Instrument Serif', serif;
  font-weight: 400;
  font-size: 32px;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 56px 0 14px;
}
.prose h2:first-child { margin-top: 0; }
.prose h3 {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.005em;
  margin: 28px 0 8px;
}
.prose p {
  margin: 0 0 14px;
  font-size: 15.5px;
  color: var(--ink-2);
  line-height: 1.65;
}
.prose ul, .prose ol {
  margin: 0 0 14px;
  padding-left: 22px;
}
.prose li {
  font-size: 15.5px;
  color: var(--ink-2);
  line-height: 1.65;
  margin-bottom: 6px;
}
.prose strong { color: var(--ink); font-weight: 600; }
.prose a { color: var(--purple); font-weight: 600; }
.prose a:hover { text-decoration: underline; }
.prose code {
  font-family: 'Geist Mono', monospace;
  font-size: 13.5px;
  background: var(--bg-2);
  color: var(--purple-deep);
  padding: 1px 6px;
  border-radius: 5px;
}
.prose hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 40px 0;
}
.prose blockquote {
  margin: 24px 0;
  padding: 18px 22px;
  background: var(--purple-tint);
  border-left: 3px solid var(--purple);
  border-radius: 0 12px 12px 0;
  font-family: 'Instrument Serif', serif;
  font-size: 18px;
  line-height: 1.5;
  color: var(--ink);
  font-style: italic;
}

.callout {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px 22px;
  margin: 24px 0;
  display: flex; gap: 14px; align-items: flex-start;
}
.callout .ic {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: var(--purple-tint);
  color: var(--purple);
  display: inline-flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.callout h4 { margin: 0 0 4px; font-size: 14.5px; font-weight: 700; }
.callout p { margin: 0; font-size: 13.5px; color: var(--ink-2); }

/* ── Footer ── */
footer {
  padding: 56px 32px 36px;
  border-top: 1px solid var(--line);
}
.footer-inner {
  max-width: 1200px; margin: 0 auto;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
}
.footer-brand p {
  margin: 14px 0 0;
  color: var(--ink-3); font-size: 13px;
  line-height: 1.5;
  max-width: 280px;
}
.footer-col h5 {
  margin: 0 0 14px;
  font-size: 12px; font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.footer-col a {
  display: block;
  color: var(--ink-2);
  font-size: 13.5px;
  padding: 4px 0;
}
.footer-col a:hover { color: var(--purple); }
.footer-bottom {
  max-width: 1200px; margin: 32px auto 0;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  display: flex; align-items: center; justify-content: space-between;
  font-size: 12.5px; color: var(--ink-3);
}
.footer-bottom .socials { display: inline-flex; gap: 8px; }
.footer-bottom .socials a {
  width: 30px; height: 30px;
  border-radius: 8px;
  background: var(--card);
  border: 1px solid var(--line);
  display: inline-flex; align-items: center; justify-content: center;
  color: var(--ink-3);
}
.footer-bottom .socials a:hover { color: var(--purple); border-color: var(--purple-soft); }

@media (max-width: 960px) {
  .nav-links { display: none; }
  .page-hero { padding: 50px 22px 36px; }
  .page-hero h1 { font-size: 36px; }
  .page-body { padding: 40px 22px 60px; }
  .page-body.has-toc { grid-template-columns: 1fr; gap: 24px; }
  .toc { position: relative; top: 0; border-left: none; padding-left: 0;
         border-top: 1px solid var(--line); padding-top: 14px; }
  .footer-inner { grid-template-columns: 1fr; gap: 28px; }
}