:root {
  color-scheme: light;
  --ink: #15223a;
  --muted: #5f6f88;
  --blue: #1258df;
  --blue-dark: #073ca9;
  --line: #dce5f3;
  --canvas: #f4f7fc;
  --card: #ffffff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--canvas);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.72;
}

a { color: var(--blue); text-underline-offset: 3px; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(220, 229, 243, .85);
  background: rgba(255, 255, 255, .9);
  backdrop-filter: blur(18px);
}

.nav {
  max-width: 980px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand { font-weight: 750; letter-spacing: -.02em; }
.links { display: flex; gap: 20px; font-size: 14px; }
.links a { color: var(--muted); text-decoration: none; }

main {
  width: min(920px, calc(100% - 32px));
  margin: 42px auto 70px;
}

.hero {
  padding: clamp(32px, 7vw, 68px);
  color: white;
  border-radius: 30px;
  background:
    radial-gradient(circle at 90% 10%, rgba(122, 190, 255, .55), transparent 32%),
    linear-gradient(140deg, #1574f6, var(--blue-dark));
  box-shadow: 0 22px 60px rgba(20, 82, 190, .22);
}

.eyebrow { margin: 0 0 8px; opacity: .82; font-weight: 650; }
h1 { margin: 0 0 14px; font-size: clamp(34px, 6vw, 58px); line-height: 1.12; letter-spacing: -.045em; }
.hero p { max-width: 640px; margin: 0; font-size: 18px; color: rgba(255, 255, 255, .86); }

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 22px;
}

.card, article {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 22px;
  box-shadow: 0 12px 34px rgba(30, 65, 120, .07);
}

.card { padding: 24px; }
.card h2 { margin: 0 0 8px; font-size: 19px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }

article { padding: clamp(24px, 5vw, 48px); }
article h1 { font-size: clamp(30px, 5vw, 44px); color: var(--ink); }
article h2 { margin: 30px 0 8px; font-size: 21px; }
article h3 { margin: 20px 0 6px; font-size: 17px; }
article p, article li { color: #40516a; }
article ul { padding-left: 22px; }

.meta {
  display: inline-flex;
  margin: 0 0 24px;
  padding: 6px 12px;
  color: var(--blue-dark);
  background: #eaf2ff;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 650;
}

.support {
  margin-top: 22px;
  padding: 28px;
  background: white;
  border: 1px solid var(--line);
  border-radius: 22px;
}

.support h2 { margin-top: 0; }
.button {
  display: inline-block;
  padding: 11px 18px;
  color: white;
  background: var(--blue);
  border-radius: 12px;
  font-weight: 650;
  text-decoration: none;
}

footer {
  margin-top: 28px;
  color: #77859a;
  text-align: center;
  font-size: 13px;
}

@media (max-width: 720px) {
  .links { gap: 12px; }
  .grid { grid-template-columns: 1fr; }
  main { margin-top: 22px; }
  .hero { border-radius: 24px; }
}