:root {
  --primary: #1E90FF;
  --secondary: #8A2BE2;
  --accent: #FF69B4;
  --dark: #2F4F4F;
  --light: #FFFFFF;
  --gray: #F0F0F0;
  --text: #333333;
}

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

body {
  font-family: 'Roboto', sans-serif;
  color: var(--text);
  line-height: 1.6;
  background-color: var(--light);
  overflow-x: hidden;
}

.header {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(30, 144, 255, 0.95);
  padding: 1.5rem;
  z-index: 1000;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
  backdrop-filter: blur(8px);
}

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

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--light);
  text-decoration: none;
  letter-spacing: 1px;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-link {
  color: var(--light);
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s ease;
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.3s ease;
}

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

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  padding: 6rem 2rem 2rem;
  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') no-repeat;
  background-size: 40%;
  background-position: right bottom;
  opacity: 0.1;
}

.hero-content {
  max-width: 1200px;
  margin: 0 auto;
  color: var(--light);
  z-index: 1;
}

.hero-title {
  font-size: 3.5rem;
  margin-bottom: 1.5rem;
  line-height: 1.2;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
  font-size: 1.5rem;
  margin-bottom: 2rem;
  max-width: 800px;
  opacity: 0.9;
}

.notice {
  background: rgba(255, 255, 255, 0.2);
  padding: 1rem;
  border-radius: 8px;
  margin: 2rem 0;
  display: inline-block;
  backdrop-filter: blur(5px);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: 3rem;
  color: var(--primary);
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 50%;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 2px;
}

.article {
  background: var(--light);
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
  padding: 3rem;
  margin-bottom: 4rem;
}

.article h2 {
  font-size: 2rem;
  color: var(--primary);
  margin: 2rem 0 1.5rem;
  position: relative;
  padding-left: 1.5rem;
}

.article h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.5rem;
  height: 1.5rem;
  width: 6px;
  background: var(--secondary);
  border-radius: 3px;
}

.article h3 {
  font-size: 1.5rem;
  color: var(--dark);
  margin: 1.5rem 0 1rem;
}

.article p {
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
  line-height: 1.8;
}

.article img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  margin: 2rem 0;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.article img:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.code-block {
  background: #282c34;
  color: #abb2bf;
  padding: 1.5rem;
  border-radius: 8px;
  margin: 2rem 0;
  overflow-x: auto;
  font-family: 'Courier New', monospace;
  font-size: 0.95rem;
  line-height: 1.5;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.code-block code {
  display: block;
  white-space: pre;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.gallery-item {
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease;
}

.gallery-item:hover {
  transform: scale(1.03);
}

.gallery-img {
  width: 100%;
  height: 300px;
  object-fit: cover;
  display: block;
}

.footer {
  background: var(--dark);
  color: var(--light);
  padding: 3rem 2rem;
  text-align: center;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
}

.footer p {
  margin-bottom: 1rem;
  opacity: 0.8;
}

.scroll-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  background: var(--primary);
  color: var(--light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  z-index: 999;
}

.scroll-top.active {
  opacity: 1;
  visibility: visible;
}

.scroll-top:hover {
  background: var(--secondary);
  transform: translateY(-3px);
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.2rem;
  }
  
  .nav-links {
    gap: 1rem;
  }
  
  .article {
    padding: 2rem;
  }
  
  .gallery {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  }
}

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

.floating {
  animation: float 6s ease-in-out infinite;
}