body {
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Arial, sans-serif;
  background: #f8fafc;
  color: #222;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.header {
  width: 100%;
  background: #1a202c;
  color: #fff;
  padding: 1.2rem 0;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
  display: flex;
  align-items: center;
  justify-content: center;
}
.logo {
  font-size: 2rem;
  font-weight: bold;
  color: #fff;
  text-decoration: none;
  letter-spacing: 1px;
}

.content-section {
  flex: 1 0 auto;
  width: 90vw;
  max-width: 900px;
  margin: 2.5rem auto 2rem auto;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 6px 32px rgba(0,0,0,0.09);
  padding: 0.5rem 2.5rem 2.5rem 2.5rem;
  line-height: 1.85;
  font-size: 1.13rem;
  letter-spacing: 0.01em;
  position: relative;
}

.content-section section + section {
  border-top: 1px solid #e2e8f0;
  margin-top: 2.5rem;
  padding-top: 0rem;
}

.hero-section {
  text-align: center;
  margin-bottom: 1.2rem;
}
.hero-section h1 {
  font-size: 2.7rem;
  margin-bottom: 0;
  margin-top: 0;
  color: #1a202c;
  font-weight: 800;
  letter-spacing: 0.02em;
}
.hero-section p {
  font-size: 1.25rem;
  color: #4a5568;
  margin-bottom: 0.5rem;
}

h2 {
  color: #2b6cb0;
  margin-top: 2.2rem;
  margin-bottom: 1.1rem;
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  border-left: 4px solid #3182ce;
  padding-left: 0.7rem;
  background: linear-gradient(90deg, #ebf8ff 60%, transparent 100%);
}

ul.longest-list {
  list-style: disc inside;
  padding-left: 1.2rem;
  margin-bottom: 1.5rem;
  background: #f1f5f9;
  border-radius: 8px;
  padding: 1rem 1.2rem;
  box-shadow: 0 2px 8px rgba(49,130,206,0.04);
}
ul.longest-list li {
  margin-bottom: 0.4rem;
  font-weight: 500;
}
ul.longest-list a {
  color: #2b6cb0;
  text-decoration: underline;
  transition: color 0.2s;
}
ul.longest-list a:hover {
  color: #1a202c;
}

section ul {
  margin-bottom: 1.2rem;
  padding-left: 1.2rem;
}
section li {
  margin-bottom: 0.3rem;
  line-height: 1.7;
}

blockquote {
  border-left: 4px solid #90cdf4;
  background: #f7fafc;
  color: #2b6cb0;
  margin: 1.5rem 0;
  padding: 1rem 1.5rem;
  font-style: italic;
  border-radius: 6px;
}

.info-card {
  background: #edf2f7;
  border-left: 5px solid #3182ce;
  padding: 1.2rem 1.5rem;
  margin: 1.5rem 0;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(49,130,206,0.04);
}

hr {
  border: none;
  border-top: 1px solid #e2e8f0;
  margin: 2.5rem 0;
}

.site-footer {
  width: 100%;
  background: #1a202c;
  color: #fff;
  padding: 2rem 0 0.5rem 0;
  margin-top: auto;
  box-shadow: 0 -2px 8px rgba(0,0,0,0.04);
  position: relative;
}
.footer-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 2rem;
}
.footer-section {
  flex: 1 1 250px;
  margin-bottom: 1.2rem;
}
.footer-section h2, .footer-section h3 {
  color: #f7fafc;
  margin-bottom: 0.5rem;
}
.footer-section ul {
  list-style: none;
  padding: 0;
}
.footer-section ul li {
  margin-bottom: 0.4rem;
}
.footer-section a {
  color: #90cdf4;
  text-decoration: none;
  transition: color 0.2s;
}
.footer-section a:hover {
  color: #fff;
}
.footer-bottom {
  text-align: center;
  font-size: 0.95rem;
  color: #cbd5e1;
  padding: 0.7rem 0 0.2rem 0;
  border-top: 1px solid #2d3748;
  margin-top: 1rem;
}

.footer-bottom .p{
    margin: 0rem;
  }

.footer-section.about-us h2 {
  background: none;
  color: #f7fafc;
  padding-left: 0;
  border-left: none;
}

@media (max-width: 600px) {
  .content-section, .footer-container {
    width: 98vw;
    padding: 1rem;
  }
  .content-section {
    padding: 1.2rem 0.5rem 1rem 0.5rem;
  }
  .footer-container {
    flex-direction: column;
    align-items: flex-start;
  }
  .hero-section h1 {
    font-size: 2rem;
  }
  .hero-section p {
    font-size: 1.1rem;
  }
  h2 {
    font-size: 1.4rem;
  }
}

/* 图片样式 */
.hero-image, .content-image {
  width: 100%;
  max-width: 800px;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.12);
  margin: 1.5rem 0;
  display: block;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hero-image:hover, .content-image:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.15);
}

.hero-image {
  margin: 1.5rem auto;
}

.content-image {
  margin: 1.5rem 0;
}

@media (max-width: 600px) {
  .hero-image, .content-image {
    border-radius: 8px;
    margin: 1rem 0;
  }
}