:root {
  --blue: #2563eb;
  --navy: #172033;
  --text: #566176;
  --line: #e8edf4;
  --background: #f7f9fc;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  color: var(--navy);
  background: var(--background);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  min-height: 100vh;
  margin: 0;
  background: radial-gradient(circle at 50% 26%, rgba(37, 99, 235, 0.08), transparent 28%), var(--background);
}

a { color: inherit; text-decoration: none; }

.site-header {
  display: flex;
  width: min(1080px, calc(100% - 48px));
  height: 76px;
  margin: 0 auto;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 9px;
  background: var(--blue);
  color: white;
  font-size: 15px;
}

nav a { color: var(--text); font-size: 14px; }

nav a:hover,
nav a:focus-visible,
.site-footer a:hover,
.site-footer a:focus-visible { color: var(--blue); }

.hero {
  display: flex;
  min-height: 600px;
  padding: 90px 24px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  text-align: center;
}

.hero-mark {
  display: grid;
  width: 84px;
  height: 84px;
  margin-bottom: 30px;
  place-items: center;
  border-radius: 24px;
  background: var(--blue);
  box-shadow: 0 16px 40px rgba(37, 99, 235, 0.2);
  color: white;
  font-size: 36px;
  font-weight: 700;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--blue);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.2em;
}

h1 {
  margin: 0;
  font-size: clamp(34px, 5.5vw, 58px);
  letter-spacing: -0.04em;
  line-height: 1.2;
}

.intro {
  max-width: 620px;
  margin: 24px 0 34px;
  color: var(--text);
  font-size: 17px;
  line-height: 1.8;
}

.more {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 12px 20px;
  background: white;
  color: var(--text);
  font-size: 14px;
  transition: border-color 160ms ease, color 160ms ease;
}

.more:hover,
.more:focus-visible { border-color: var(--blue); color: var(--blue); }

.about {
  width: min(860px, calc(100% - 48px));
  margin: 0 auto 100px;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: clamp(32px, 6vw, 64px);
  background: rgba(255, 255, 255, 0.8);
  text-align: center;
}

.about h2 { margin: 0 0 22px; font-size: 30px; }

.about > p:last-child {
  max-width: 650px;
  margin: 0 auto;
  color: var(--text);
  line-height: 2;
}

.site-footer {
  display: flex;
  min-height: 84px;
  padding: 24px;
  align-items: center;
  justify-content: center;
  gap: 28px;
  border-top: 1px solid var(--line);
  background: white;
  color: #7b8495;
  font-size: 13px;
}

.site-footer p { margin: 0; }

@media (max-width: 600px) {
  .site-header { width: calc(100% - 32px); }
  .hero { min-height: 560px; }
  .about { width: calc(100% - 32px); margin-bottom: 72px; }
  .site-footer { flex-direction: column; gap: 9px; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}