* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: #fff;
  color: #1d1d1f;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── 导航 ─────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.25rem;
  height: 46px;
  background: rgba(16, 32, 80, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: #fff;
  text-decoration: none;
}

.nav-logo {
  width: 22px;
  height: 22px;
  border-radius: 6px;
}

.nav-link {
  font-size: 0.9rem;
  color: #6e6e73;
  text-decoration: none;
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  transition: color 0.15s, background 0.15s;
}

.nav-link:hover {
  color: #102050;
  background: #f0f2f7;
}

/* ── Hero ─────────────────────────── */
.hero {
  flex: 1;
  min-height: calc(100vh - 46px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 3rem 1.5rem;
  background:
    radial-gradient(ellipse 80% 55% at 50% -10%, rgba(96, 150, 240, 0.35) 0%, rgba(16, 32, 80, 0) 60%),
    linear-gradient(180deg, #1d3a75 0%, #102050 60%, #0a1838 100%);
}

.hero-eyebrow {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.35em;
  text-indent: 0.35em;
  color: #7d9bd4;
  margin-bottom: 1.75rem;
}

.hero-title {
  font-size: clamp(2.5rem, 6.5vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.12;
  color: #fff;
}

.hero-title em {
  font-style: normal;
  background: linear-gradient(135deg, #ffffff 0%, #9db9e8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-tagline {
  margin-top: 1.5rem;
  max-width: 30em;
  font-size: clamp(1rem, 2.4vw, 1.2rem);
  line-height: 1.7;
  color: #b8c4e0;
}

.hero-concept {
  margin-top: 2rem;
  max-width: 30em;
  font-size: clamp(0.95rem, 2vw, 1.05rem);
  line-height: 1.7;
  color: #cdd7ee;
}

.hero-contact {
  margin-top: 2.25rem;
}

.hero-contact a {
  display: inline-block;
  padding: 0.65rem 1.5rem;
  border: 1px solid rgba(157, 185, 232, 0.45);
  border-radius: 999px;
  color: #e8eefc;
  font-size: 0.95rem;
  text-decoration: none;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.hero-contact a:hover {
  background: rgba(157, 185, 232, 0.12);
  border-color: rgba(157, 185, 232, 0.8);
  color: #fff;
}

/* ── Footer ───────────────────────── */
.footer {
  width: 100%;
  padding: 1rem 1.5rem;
  text-align: center;
  font-size: 0.8rem;
  color: #93a6c9;
  background: #0a1838;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  overflow-x: hidden;
}

.footer .slogan {
  margin-bottom: 0.5rem;
  color: #b8c4e0;
  font-size: 0.85rem;
}

.footer p {
  margin-bottom: 0.25rem;
}

.footer a {
  color: #93a6c9;
  text-decoration: none;
}

.footer a:hover {
  color: #fff;
  text-decoration: underline;
}

.footer-beian {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.beian-gongan {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.beian-gongan img {
  width: 14px;
  height: 14px;
  vertical-align: middle;
}