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

:root {
  --bg: #f6f8fb;
  --bg-soft: #eef3f9;
  --surface: #ffffff;
  --surface-dark: #0d1320;
  --border: rgba(15, 23, 42, 0.1);
  --text: #0f172a;
  --muted: #64748b;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --shadow: 0 24px 80px rgba(15, 23, 42, 0.12);
}

html {
  font-size: 16px;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(246, 248, 251, 0.86);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(18px);
}

.nav {
  width: min(1120px, calc(100% - 40px));
  height: 68px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text);
  text-decoration: none;
  transition: color 0.2s;
}

.logo:hover,
.nav-link:hover {
  color: var(--accent);
}

.nav-link {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: color 0.2s;
}

main {
  flex: 1;
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 5rem 0 6rem;
}

.intro {
  max-width: 820px;
  margin: 0 auto 3rem;
  text-align: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.1rem;
  padding: 0.35rem 0.8rem;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.16);
  border-radius: 999px;
}

.intro h1 {
  color: var(--text);
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 800;
  line-height: 0.98;
  letter-spacing: -0.06em;
  margin-bottom: 1.35rem;
}

.intro-desc {
  max-width: 640px;
  margin: 0 auto 2rem;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.18rem);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.85rem;
}

.primary-button,
.secondary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  min-height: 46px;
  padding: 0 1.1rem;
  border-radius: 12px;
  font-size: 0.94rem;
  font-weight: 700;
  text-decoration: none;
  transition: transform 0.16s, box-shadow 0.16s, color 0.16s, background 0.16s;
}

.primary-button {
  color: #fff;
  background: var(--text);
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.18);
}

.secondary-button {
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
}

.primary-button:hover,
.secondary-button:hover {
  transform: translateY(-2px);
}

.primary-button:hover {
  background: #1e293b;
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.22);
}

.secondary-button:hover {
  color: var(--accent);
  box-shadow: 0 14px 34px rgba(15, 23, 42, 0.08);
}

.banner {
  position: relative;
  margin: 0 auto 3rem;
  padding: 8px;
  border-radius: 28px;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.22), rgba(15, 23, 42, 0.08));
  box-shadow: var(--shadow);
  overflow: hidden;
}

.banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 25% 0%, rgba(255, 255, 255, 0.5), transparent 35%);
  pointer-events: none;
}

.banner img {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border-radius: 22px;
}

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

.detail-card {
  padding: 1.35rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: 0 14px 44px rgba(15, 23, 42, 0.06);
}

.card-kicker {
  display: block;
  margin-bottom: 0.65rem;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.detail-card h2 {
  margin-bottom: 0.55rem;
  color: var(--text);
  font-size: 1.05rem;
}

.detail-card p {
  color: var(--muted);
  font-size: 0.94rem;
}

.site-footer {
  background: var(--surface-dark);
  color: #dbeafe;
}

.footer-inner {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 1.6rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.footer-brand {
  font-size: 0.9rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: #fff;
}

.copyright {
  color: #94a3b8;
  font-size: 0.8125rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.9rem;
}

.footer-links a {
  color: #cbd5e1;
  font-size: 0.8125rem;
  text-decoration: none;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: #fff;
}

.beian-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.beian-link img {
  display: block;
  flex-shrink: 0;
}

@media (max-width: 760px) {
  .nav,
  main,
  .footer-inner {
    width: min(100% - 28px, 1120px);
  }

  main {
    padding: 3.5rem 0 4rem;
  }

  .details {
    grid-template-columns: 1fr;
  }

  .banner {
    border-radius: 22px;
  }

  .banner img {
    aspect-ratio: 16 / 10;
    border-radius: 16px;
  }

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

  .footer-links {
    justify-content: flex-start;
  }
}