:root {
  --bg: #f6f7fb;
  --panel: #ffffff;
  --text: #1f2937;
  --muted: #667085;
  --line: #e5e7eb;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}

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

a:hover { color: var(--primary); }

.container {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.nav {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: 22px;
  color: var(--muted);
  font-size: 15px;
}

.hero {
  padding: 96px 0 80px;
  background:
    radial-gradient(circle at 20% 10%, rgba(37, 99, 235, 0.14), transparent 26%),
    radial-gradient(circle at 90% 20%, rgba(16, 185, 129, 0.12), transparent 28%);
}

.hero-inner {
  max-width: 820px;
  text-align: center;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--primary);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1, h2, h3 { line-height: 1.25; margin: 0; }

h1 {
  font-size: clamp(36px, 6vw, 64px);
  letter-spacing: -0.05em;
}

h2 { font-size: clamp(28px, 4vw, 40px); letter-spacing: -0.03em; }

h3 { font-size: 22px; margin-bottom: 12px; }

.lead {
  max-width: 760px;
  margin: 24px auto 0;
  color: var(--muted);
  font-size: 18px;
}

.actions {
  display: flex;
  justify-content: center;
  gap: 14px;
  margin-top: 36px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border-radius: 999px;
  color: #fff;
  background: var(--primary);
  font-weight: 700;
  box-shadow: 0 10px 22px rgba(37, 99, 235, 0.22);
}

.button:hover { color: #fff; background: var(--primary-dark); }

.button-secondary {
  color: var(--text);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: none;
}

.button-secondary:hover { color: var(--primary); background: #fff; }

.section { padding: 72px 0; }

.section-title { margin-bottom: 28px; }

.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.card, .notice {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 28px;
  box-shadow: var(--shadow);
}

.card p, .notice p, .page p { color: var(--muted); margin: 12px 0 0; }

.two-column {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 24px;
  align-items: start;
}

.page {
  max-width: 860px;
  padding: 76px 0 96px;
}

.page h1 { font-size: clamp(34px, 5vw, 52px); }

.page h2 {
  margin-top: 34px;
  font-size: 26px;
}

.clean-list {
  margin: 18px 0 0;
  padding-left: 22px;
  color: var(--muted);
}

.site-footer {
  border-top: 1px solid var(--line);
  background: #fff;
  color: var(--muted);
  font-size: 14px;
}

.footer-inner {
  min-height: 88px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 6px;
  text-align: center;
}

.footer-inner p { margin: 0; }

.center-page { text-align: center; }

.fixed-footer {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
}

@media (max-width: 760px) {
  .nav {
    height: auto;
    padding: 18px 0;
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links { gap: 14px; flex-wrap: wrap; }
  .hero { padding: 70px 0 58px; }
  .cards, .two-column { grid-template-columns: 1fr; }
  .section { padding: 52px 0; }
}