:root {
  --navy-0: #07164A;
  --navy-1: #0F3480;
  --navy-card: #102a5e;
  --cyan: #2bb7d6;
  --cyan-2: #5fd0e6;
  --text: #e8eef5;
  --muted: #a9b8d0;
  --line: rgba(255, 255, 255, 0.10);
  --maxw: 820px;
}
* { 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(--text);
  background: linear-gradient(160deg, var(--navy-1) 0%, var(--navy-0) 60%, #050f33 100%);
  background-attachment: fixed;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--cyan-2); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }

header.site {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 22px; max-width: 1080px; margin: 0 auto;
}
.brand { display: flex; align-items: center; gap: 12px; font-weight: 700; font-size: 18px; }
.brand img { width: 40px; height: 40px; border-radius: 11px; }
.brand small { display: block; font-weight: 500; font-size: 12px; color: var(--muted); }
nav.top a { color: var(--muted); margin-left: 18px; font-size: 14px; }
nav.top a:hover { color: var(--text); text-decoration: none; }

.hero { text-align: center; padding: 56px 22px 30px; }
.hero img.logo { width: 112px; height: 112px; border-radius: 28px; box-shadow: 0 18px 50px rgba(0,0,0,.45); }
.hero h1 { font-size: clamp(34px, 6vw, 52px); margin: 22px 0 6px; letter-spacing: -.5px; }
.hero .tag { font-size: clamp(16px, 2.6vw, 20px); color: var(--cyan-2); margin: 0 0 10px; }
.hero p.lead { color: var(--muted); max-width: 640px; margin: 14px auto 26px; font-size: 17px; }
.btns { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 12px 22px; border-radius: 999px; font-weight: 600; font-size: 15px;
  background: linear-gradient(180deg, var(--cyan-2), var(--cyan)); color: #05203a;
}
.btn.ghost { background: transparent; color: var(--text); border: 1px solid var(--line); }
.btn:hover { text-decoration: none; filter: brightness(1.05); }

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin: 44px auto; }
.card {
  background: rgba(16, 42, 94, 0.55); border: 1px solid var(--line); border-radius: 16px; padding: 20px;
  backdrop-filter: blur(6px);
}
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 14.5px; }

main.doc { max-width: var(--maxw); margin: 0 auto; padding: 28px 22px 60px; }
main.doc h1 { font-size: 32px; margin-bottom: 4px; }
main.doc h2 { font-size: 21px; margin-top: 34px; border-top: 1px solid var(--line); padding-top: 22px; }
main.doc h3 { font-size: 17px; margin-top: 22px; }
main.doc .meta { color: var(--muted); font-size: 14px; }
main.doc .note {
  background: rgba(43, 183, 214, 0.10); border: 1px solid rgba(43, 183, 214, 0.35);
  border-radius: 12px; padding: 14px 16px; margin: 18px 0; font-size: 14.5px; color: #cfeaf2;
}
main.doc ul { padding-left: 20px; }
main.doc li { margin: 6px 0; }
main.doc code { background: rgba(255,255,255,.08); padding: 1px 6px; border-radius: 5px; font-size: 90%; }

footer.site { border-top: 1px solid var(--line); margin-top: 40px; }
footer.site .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; padding: 22px; color: var(--muted); font-size: 13.5px; max-width: 1080px; }
footer.site a { color: var(--muted); margin-left: 16px; }