:root {
  --ink: #0f172a;
  --muted: #5b6b84;
  --line: #e3e8f0;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --bg-soft: #f5f7fb;
  --radius: 14px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: #fff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-dark); text-decoration: underline; }

.wrap {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* header */
.site-header {
  border-bottom: 1px solid var(--line);
  background: #fff;
  position: sticky;
  top: 0;
  z-index: 10;
}
.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 72px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--ink);
}
.brand:hover { text-decoration: none; }
.brand svg { display: block; }
.nav { display: flex; gap: 22px; margin-left: auto; font-size: 15px; }
.nav a { color: var(--muted); font-weight: 500; }
.nav a:hover, .nav a.active { color: var(--ink); text-decoration: none; }

/* hero */
.hero {
  padding: 72px 0 56px;
  background:
    radial-gradient(900px 380px at 82% -10%, #e8efff 0%, rgba(232,239,255,0) 70%),
    #fff;
  border-bottom: 1px solid var(--line);
}
.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(30px, 4.4vw, 46px);
  line-height: 1.15;
  letter-spacing: -0.02em;
}
.hero p.lead {
  max-width: 640px;
  font-size: 18px;
  color: var(--muted);
  margin: 0 0 28px;
}
.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  border: 1px solid var(--accent);
}
.btn:hover { background: var(--accent-dark); color: #fff; text-decoration: none; }
.btn.ghost {
  background: #fff;
  color: var(--ink);
  border: 1px solid var(--line);
  margin-left: 10px;
}
.btn.ghost:hover { border-color: #c9d3e3; color: var(--ink); text-decoration: none; }

/* sections */
section { padding: 56px 0; }
section.soft { background: var(--bg-soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
h2 { font-size: 26px; margin: 0 0 8px; letter-spacing: -0.01em; }
.sub { color: var(--muted); margin: 0 0 32px; }

.grid { display: grid; gap: 20px; }
.grid.three { grid-template-columns: repeat(3, 1fr); }
.grid.four  { grid-template-columns: repeat(4, 1fr); }

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  background: #fff;
}
.card h3 { margin: 0 0 8px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }

.stat { padding: 8px 0; }
.stat strong { display: block; font-size: 30px; letter-spacing: -0.02em; }
.stat span { color: var(--muted); font-size: 14px; }

.steps { counter-reset: step; display: grid; gap: 16px; }
.step {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 14px;
  align-items: start;
}
.step::before {
  counter-increment: step;
  content: counter(step);
  width: 34px; height: 34px;
  border-radius: 50%;
  background: #eaf0ff;
  color: var(--accent);
  font-weight: 700;
  display: grid;
  place-items: center;
  font-size: 15px;
}
.step h3 { margin: 4px 0 4px; font-size: 16px; }
.step p { margin: 0; color: var(--muted); font-size: 15px; }

/* content pages */
.page { padding: 52px 0 72px; }
.page h1 { font-size: 34px; letter-spacing: -0.02em; margin: 0 0 12px; }
.page h2 { font-size: 21px; margin: 32px 0 10px; }
.page p, .page li { color: #33415c; }
.prose { max-width: 760px; }
.prose ul { padding-left: 20px; }
.prose li { margin: 6px 0; }

.meta-row { display: flex; flex-wrap: wrap; gap: 40px; margin-top: 28px; }
.meta-row div { min-width: 200px; }
.meta-row dt { color: var(--muted); font-size: 13px; text-transform: uppercase; letter-spacing: 0.06em; }
.meta-row dd { margin: 4px 0 0; font-size: 16px; }

/* footer */
.site-footer {
  border-top: 1px solid var(--line);
  background: #fff;
  padding: 40px 0 32px;
  font-size: 14px;
  color: var(--muted);
}
.site-footer .cols {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 28px;
}
.site-footer strong { color: var(--ink); display: block; margin-bottom: 6px; }
.site-footer a { color: var(--muted); }
.site-footer .bottom {
  border-top: 1px solid var(--line);
  padding-top: 18px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

@media (max-width: 900px) {
  .grid.three, .grid.four { grid-template-columns: 1fr 1fr; }
  .site-footer .cols { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 620px) {
  .nav { display: none; }
  .grid.three, .grid.four { grid-template-columns: 1fr; }
  .site-footer .cols { grid-template-columns: 1fr; }
  .hero { padding: 48px 0 40px; }
  .btn.ghost { margin: 10px 0 0; }
}