:root {
  --ink: #101827;
  --muted: #64748b;
  --blue: #2563eb;
  --cyan: #22d3ee;
  --green: #10b981;
  --line: rgba(37, 99, 235, 0.14);
  --paper: #f7fbff;
  --white: #fff;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 12% 8%, rgba(37, 99, 235, 0.12), transparent 28%),
    radial-gradient(circle at 82% 12%, rgba(34, 211, 238, 0.12), transparent 28%),
    linear-gradient(180deg, #f8fbff 0%, #ffffff 54%, #f4f8ff 100%);
}

a {
  color: var(--blue);
  text-decoration: none;
}

.container {
  width: min(1040px, calc(100% - 40px));
  margin: 0 auto;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 800;
}

.mark {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: conic-gradient(from 140deg, #fff, #93c5fd, #8b5cf6, #22d3ee, #fff);
  border: 1px solid rgba(37, 99, 235, 0.3);
}

.mark::after {
  content: "";
  display: block;
  width: 18px;
  height: 18px;
  margin: 6px;
  border-radius: 50%;
  background: #fff;
}

.nav-links {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: flex-end;
  font-size: 14px;
  font-weight: 650;
}

.hero {
  padding: 82px 0 56px;
}

.kicker {
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  max-width: 900px;
  margin: 18px 0 0;
  font-size: clamp(42px, 6vw, 76px);
  line-height: 1.02;
  letter-spacing: 0;
}

.lead {
  max-width: 780px;
  margin: 24px 0 0;
  color: #475569;
  font-size: 20px;
  line-height: 1.85;
}

.answer-box {
  margin-top: 34px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 20px 60px rgba(37, 99, 235, 0.08);
}

.answer-box p,
.answer-box li,
.card p,
.article p {
  color: #475569;
  font-size: 17px;
  line-height: 1.85;
}

section {
  padding: 62px 0;
}

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

.grid.two {
  grid-template-columns: repeat(2, 1fr);
}

.card {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.8);
}

.card b {
  color: var(--blue);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h2 {
  margin: 0 0 24px;
  font-size: clamp(32px, 4vw, 50px);
  line-height: 1.08;
}

h3 {
  margin: 18px 0 0;
  font-size: 24px;
  line-height: 1.25;
}

.article {
  max-width: 860px;
}

.article h2 {
  margin-top: 54px;
}

.cta {
  padding: 34px;
  border-radius: 22px;
  background:
    linear-gradient(135deg, rgba(37, 99, 235, 0.12), rgba(34, 211, 238, 0.12)),
    rgba(255, 255, 255, 0.86);
  border: 1px solid var(--line);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  margin-top: 18px;
  border-radius: 999px;
  background: var(--blue);
  color: #fff;
  font-weight: 780;
}

footer {
  padding: 34px 0;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

@media (max-width: 760px) {
  .grid,
  .grid.two {
    grid-template-columns: 1fr;
  }

  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero {
    padding-top: 48px;
  }
}