:root {
  --primary-color: #1e3c72;
  --secondary-color: #2a5298;
  --accent-color: #00bfff;
  --text-light: #ffffff;
  --text-dark: #333333;
  --glass-opacity: 0.1;
  --transition-speed: 0.3s;
}

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

body {
  font-family: 'Roboto', 'Helvetica', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-light);
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  min-height: 100%;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(30, 60, 114, 0.9);
  padding: 15px 0;
  z-index: 1000;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
  backdrop-filter: blur(10px);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-light);
  text-decoration: none;
}

.nav {
  display: flex;
  gap: 20px;
}

.nav-link {
  color: var(--text-light);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-speed);
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent-color);
  transition: width var(--transition-speed);
}

.nav-link:hover::after {
  width: 100%;
}

.main {
  margin-top: 80px;
  padding: 40px 0;
}

.hero {
  text-align: center;
  padding: 60px 0;
  margin-bottom: 40px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('https://images.gptkong.com/demo/sample1.png') center/cover no-repeat;
  opacity: 0.2;
  z-index: -1;
}

.hero-title {
  font-size: 2.5rem;
  margin-bottom: 20px;
  color: var(--text-light);
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
  font-size: 1.2rem;
  max-width: 800px;
  margin: 0 auto 30px;
  color: rgba(255, 255, 255, 0.9);
}

.notice {
  background: rgba(255, 255, 255, 0.2);
  padding: 15px;
  border-radius: 8px;
  margin-bottom: 40px;
  text-align: center;
  backdrop-filter: blur(5px);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.article {
  background: rgba(255, 255, 255, 0.05);
  border-radius: 15px;
  padding: 40px;
  margin-bottom: 40px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  backdrop-filter: blur(5px);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.article h2 {
  font-size: 1.8rem;
  margin-bottom: 20px;
  color: var(--accent-color);
  position: relative;
  padding-bottom: 10px;
}

.article h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-color), transparent);
}

.article h3 {
  font-size: 1.5rem;
  margin: 30px 0 15px;
  color: var(--text-light);
}

.article p {
  margin-bottom: 20px;
  font-size: 1.1rem;
  line-height: 1.7;
}

.code-container {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 8px;
  padding: 20px;
  margin: 20px 0;
  overflow-x: auto;
  border-left: 4px solid var(--accent-color);
}

pre {
  margin: 0;
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.9rem;
  line-height: 1.5;
  color: #f8f8f2;
}

code {
  font-family: inherit;
}

.grid-example {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin: 30px 0;
}

.grid-item {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  padding: 20px;
  transition: all var(--transition-speed);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.grid-item:hover {
  transform: translateY(-5px);
  background: rgba(255, 255, 255, 0.2);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.grid-img {
  width: 120px;
  height: 120px;
  object-fit: cover;
  border-radius: 50%;
  margin-bottom: 15px;
  border: 3px solid rgba(255, 255, 255, 0.2);
  transition: all var(--transition-speed);
}

.grid-item:hover .grid-img {
  transform: scale(1.1);
  border-color: var(--accent-color);
}

.footer {
  text-align: center;
  padding: 30px 0;
  background: rgba(0, 0, 0, 0.2);
  margin-top: 60px;
}

@media (max-width: 768px) {
  .header-container {
    flex-direction: column;
    gap: 15px;
  }
  
  .nav {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .article {
    padding: 30px 20px;
  }
  
  .grid-example {
    grid-template-columns: 1fr;
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

.floating {
  animation: float 3s ease-in-out infinite;
}