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

html,
body {
  height: 100%;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: #333;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: #f5f7fa;
}

/* 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

.navbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
}

.logo {
  font-size: 1.25rem;
  font-weight: 600;
  color: #1a1a2e;
  text-decoration: none;
  letter-spacing: 0.05em;
  transition: color 0.2s ease;
}

.logo:hover {
  color: #2563eb;
}

/* 中间主区域 */
.hero {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 64px;
  min-height: calc(100vh - 64px - 80px);
  background-image: url("images/hero-bg.jpg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-color: #1e3a5f;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(15, 23, 42, 0.72) 0%,
    rgba(30, 58, 95, 0.55) 50%,
    rgba(37, 99, 235, 0.35) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 40px 24px;
  animation: fadeInUp 0.8s ease-out;
}

.hero-title {
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.15em;
  text-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  margin-bottom: 16px;
}

.hero-subtitle {
  font-size: clamp(0.95rem, 2.5vw, 1.125rem);
  color: rgba(255, 255, 255, 0.85);
  letter-spacing: 0.08em;
  font-weight: 300;
}

/* 底部备案 */
.footer {
  background: #1a1a2e;
  color: rgba(255, 255, 255, 0.7);
  padding: 20px 24px;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}

.footer-address {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.65);
  margin-bottom: 8px;
  line-height: 1.6;
}

.beian {
  font-size: 0.875rem;
  margin-bottom: 6px;
}

.beian a {
  color: rgba(255, 255, 255, 0.75);
  text-decoration: none;
  transition: color 0.2s ease;
}

.beian a:hover {
  color: #60a5fa;
}

.copyright {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.45);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 480px) {
  .navbar-inner {
    height: 56px;
    padding: 0 16px;
  }

  .hero {
    margin-top: 56px;
    min-height: calc(100vh - 56px - 76px);
  }

  .logo {
    font-size: 1.1rem;
  }
}