body {
  background-color: #000000;
  margin: 0;
  padding: 0;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  line-height: 1.6;
}

.background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  overflow: hidden;
}

.circle {
  position: absolute;
  border-radius: 50%;
  opacity: 0;
  transform: scale(0.8);
  filter: blur(25px);
  animation: fadeInScale 0.8s ease-out forwards;
}

@keyframes fadeInScale {
  from {
    opacity: 0;
    transform: scale(0.8);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

.circle-1 {
  width: 480px;
  height: 480px;
  top: 10%;
  left: -10%;
  background: radial-gradient(circle at center,
      rgba(0, 0, 255, 0.36) 0%,
      rgba(0, 0, 255, 0.12) 50%,
      transparent 70%);
  animation-delay: 0.1s;
}

.content {
  position: relative;
  z-index: 2;
  padding: 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.title {
  margin-top: 95px;
  text-align: center;
  font-size: 3.5rem;
  font-weight: 600;
  color: #ffffff;
  letter-spacing: 1px;
  margin-bottom: 10px;
  line-height: 1.2;
}

.desc {
  color: #bbbbbb;
  text-align: center;
  font-size: 1.2rem;
  margin-top: 0;
  line-height: 1.5;
  margin-bottom: 30px;
}

nav.main-nav {
  margin: 20px 0 30px;
  text-align: center;
}

nav.main-nav a {
  display: inline-block;
  padding: 10px 24px;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 20px;
  color: #ffffff;
  text-decoration: none;
  font-size: 1rem;
  transition: all 0.3s ease;
  margin: 0 8px;
  font-weight: 500;
  letter-spacing: 0.5px;
}

nav.main-nav a:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  border-color: #7a95ff;
}

nav.main-nav a:focus {
  outline: 2px solid #7a95ff;
  outline-offset: 2px;
}

#main-content {
  max-width: 800px;
  margin: 40px auto 0;
  padding: 0 20px;
}

.content-section {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border-radius: 20px;
  padding: 30px;
  margin-bottom: 40px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.section-header {
  margin-bottom: 25px;
  text-align: center;
}

.content-section h2 {
  color: #ffffff;
  font-size: 2.2rem;
  margin-bottom: 8px;
  font-weight: 600;
  line-height: 1.3;
}

.subtitle {
  color: #cccccc;
  font-size: 1.1rem;
  margin-top: 0;
  letter-spacing: 1px;
  font-weight: 400;
}

.section-content p {
  color: #dddddd;
  font-size: 1.1rem;
  line-height: 1.8;
  margin-bottom: 15px;
}

strong {
  color: #ffffff;
  font-weight: 700;
}

em {
  font-style: italic;
  color: #7a95ff;
}

a {
  color: #7a95ff;
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: #a0b3ff;
  text-decoration: underline;
}

@media (max-width: 768px) {
  .title {
    font-size: 2.5rem;
    margin-top: 60px;
  }

  .desc {
    font-size: 1rem;
  }

  nav.main-nav {
    margin: 15px 0 20px;
  }

  nav.main-nav a {
    padding: 8px 18px;
    font-size: 0.95rem;
    margin: 5px;
    display: inline-block;
  }

  .content-section {
    padding: 20px;
  }

  .content-section h2 {
    font-size: 1.8rem;
  }

  .subtitle {
    font-size: 1rem;
  }

  .section-content p {
    font-size: 1rem;
  }

  #main-content {
    padding: 0 15px;
  }
}

@media (max-width: 480px) {
  .title {
    font-size: 2rem;
    margin-top: 50px;
  }

  nav.main-nav a {
    padding: 6px 16px;
    font-size: 0.9rem;
    margin: 3px;
  }

  .content {
    padding: 15px;
  }
}

.section-content {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 30px;
  align-items: center;
}

.section-content img {
  width: 120px;
  height: 120px;
  object-fit: contain;
  filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.2));
  transition: all 0.3s ease;
  opacity: 0.9;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.05);
  padding: 15px;
}

.section-content img:hover {
  transform: translateY(-5px) scale(1.05);
  filter: drop-shadow(0 8px 16px rgba(122, 149, 255, 0.3));
  opacity: 1;
}

.section-content img:nth-child(1) {
  animation-delay: 0.1s;
}

.section-content img:nth-child(2) {
  animation-delay: 0.2s;
}

.section-content img:nth-child(3) {
  animation-delay: 0.3s;
}

@media (max-width: 768px) {
  .section-content {
    gap: 20px;
  }

  .section-content img {
    width: 90px;
    height: 90px;
    padding: 10px;
  }
}

@media (max-width: 480px) {
  .section-content {
    gap: 15px;
  }

  .section-content img {
    width: 80px;
    height: 80px;
    padding: 8px;
  }
}