:root {
  --blue: #2563eb;
  --purple: #4c1d95;
  --mint: #10b981;
  --ink: #0f172a;
  --muted: #475569;
  --line: #e2e8f0;
  --bg: #f8fafc;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 960px;
  margin: 0 auto;
  padding: 18px 24px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 18px; color: var(--ink); }
.brand .logo {
  width: 34px; height: 34px; border-radius: 9px;
  background: linear-gradient(135deg, var(--blue), var(--purple));
  display: grid; place-items: center; color: #fff; font-size: 18px;
}
.nav .links a { margin-left: 18px; color: var(--muted); font-weight: 600; }

.hero {
  background: linear-gradient(135deg, var(--blue), var(--purple));
  color: #fff;
  text-align: center;
  padding: 80px 24px 96px;
}
.hero h1 { font-size: 44px; font-weight: 800; letter-spacing: -1px; margin: 0 0 14px; }
.hero p { font-size: 19px; opacity: 0.92; max-width: 560px; margin: 0 auto 28px; }
.badges { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block; background: #fff; color: var(--blue);
  font-weight: 700; padding: 14px 26px; border-radius: 14px;
}
.btn.ghost { background: rgba(255,255,255,0.14); color: #fff; }

.features {
  max-width: 960px; margin: -56px auto 0; padding: 0 24px 64px;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px;
}
.card {
  background: #fff; border: 1px solid var(--line); border-radius: 18px;
  padding: 22px; box-shadow: 0 10px 30px rgba(15,23,42,0.05);
}
.card h3 { margin: 6px 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.card .ico { font-size: 26px; }

.doc { max-width: 760px; margin: 0 auto; padding: 48px 24px 80px; }
.doc h1 { font-size: 34px; letter-spacing: -0.5px; margin-bottom: 4px; }
.doc .updated { color: var(--muted); margin-top: 0; }
.doc h2 { font-size: 22px; margin-top: 36px; }
.doc ul { padding-left: 20px; }
.doc li { margin: 6px 0; }
.callout {
  background: #eff6ff; border: 1px solid #bfdbfe; border-radius: 12px;
  padding: 14px 16px; font-size: 15px;
}

footer {
  border-top: 1px solid var(--line); color: var(--muted);
  text-align: center; padding: 28px 24px; font-size: 14px;
}
footer a { margin: 0 8px; color: var(--muted); }
.center { text-align: center; }
.notfound { max-width: 600px; margin: 0 auto; padding: 120px 24px; text-align: center; }
.notfound h1 { font-size: 64px; margin: 0; color: var(--blue); }