:root {
  --bg: #0b0b12;
  --bg-elevated: #141420;
  --fg: #f2f1f7;
  --muted: #9995ab;
  --border: #26243a;
  --accent: #8b5cf6;
  --accent2: #ec4899;
  --code-bg: #100f19;
  color-scheme: dark;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #fbfaff;
    --bg-elevated: #ffffff;
    --fg: #17151f;
    --muted: #6b6478;
    --border: #e7e4f2;
    --code-bg: #14121f;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1080px;
  margin: 0 auto;
  padding: 20px 24px;
}
.nav .brand {
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav .brand .dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  display: inline-block;
}
.nav .links { display: flex; gap: 22px; font-size: 14px; }
.nav .links a { color: var(--muted); }
.nav .links a.active, .nav .links a:hover { color: var(--fg); }

.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 760px; }

.hero {
  padding: 72px 24px 40px;
  text-align: center;
}
.hero h1 {
  font-size: clamp(34px, 6vw, 56px);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin: 0 0 18px;
  background: linear-gradient(135deg, var(--fg) 30%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero p.lead {
  color: var(--muted);
  font-size: 18px;
  max-width: 620px;
  margin: 0 auto 30px;
}
.cta-row { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 14.5px;
  border: 1px solid var(--border);
}
.btn.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: white;
  border: none;
}
.btn.primary:hover { opacity: 0.92; text-decoration: none; }
.btn.secondary { color: var(--fg); }
.btn.secondary:hover { background: var(--bg-elevated); text-decoration: none; }

.diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin: 48px 0;
  font-size: 13.5px;
}
.diagram .step {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
  min-width: 140px;
  text-align: center;
}
.diagram .step .k { color: var(--muted); font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 4px; }
.diagram .arrow { color: var(--muted); font-size: 18px; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
  margin: 40px 0;
}
.feature {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
}
.feature h3 { margin: 0 0 8px; font-size: 15.5px; }
.feature p { margin: 0; color: var(--muted); font-size: 13.5px; }

section { padding: 20px 0 40px; }
h2 { font-size: 26px; letter-spacing: -0.02em; margin: 0 0 6px; }
p.section-sub { color: var(--muted); margin: 0 0 28px; }

pre {
  background: var(--code-bg);
  color: #e8e6f5;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.55;
}
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
:not(pre) > code {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 1px 5px;
  font-size: 0.92em;
}

.step-list { counter-reset: step; list-style: none; padding: 0; margin: 0; }
.step-list > li {
  counter-increment: step;
  position: relative;
  padding: 0 0 28px 44px;
  border-left: 2px solid var(--border);
  margin-left: 15px;
}
.step-list > li:last-child { border-left-color: transparent; padding-bottom: 0; }
.step-list > li::before {
  content: counter(step);
  position: absolute;
  left: -15px;
  top: 0;
  width: 28px; height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: white;
  font-weight: 700;
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.step-list h3 { margin: 2px 0 8px; font-size: 16px; }

.callout {
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  border-radius: 12px;
  padding: 14px 16px;
  font-size: 13.5px;
  color: var(--muted);
  margin: 18px 0;
}
.callout strong { color: var(--fg); }

.app-layout {
  display: flex;
  justify-content: center;
  padding: 48px 24px 80px;
}
.app-layout .side {
  max-width: 340px;
  margin-right: 40px;
}
.app-layout .side h1 { font-size: 26px; margin: 0 0 10px; }
.app-layout .side p { color: var(--muted); font-size: 14px; }
@media (max-width: 820px) {
  .app-layout { flex-direction: column; align-items: center; }
  .app-layout .side { margin-right: 0; margin-bottom: 24px; text-align: center; }
}

footer {
  border-top: 1px solid var(--border);
  padding: 28px 24px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}
footer .footer-links {
  margin-top: 8px;
}