:root {
  --primary: #0f2027;
  --secondary: #203a43;
  --accent: #00c6ff;
  --highlight: #0072ff;
  --text: #ffffff;
  --card-bg: rgba(255, 255, 255, 0.1);
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

body {
  background: linear-gradient(135deg, var(--primary), var(--secondary), #2c5364);
  color: var(--text);
  font-family: 'Roboto', sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  min-height: 100%;
}

.header {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  padding: 1rem 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(10px);
  transition: var(--transition);
}

.header:hover {
  background: linear-gradient(to right, var(--accent), var(--highlight));
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

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

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

.nav-link {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  position: relative;
  padding: 0.5rem 0;
}

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

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

.main {
  max-width: 1200px;
  margin: 6rem auto 0;
  padding: 2rem;
}

.hero {
  text-align: center;
  margin-bottom: 4rem;
  padding: 4rem 0;
  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: 0.1;
  z-index: -1;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
  background: linear-gradient(to right, var(--accent), var(--highlight));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero p {
  max-width: 800px;
  margin: 0 auto 2rem;
  font-size: 1.2rem;
}

.notice {
  background: rgba(255, 255, 255, 0.1);
  padding: 1rem;
  border-radius: 8px;
  margin: 2rem 0;
  border-left: 4px solid var(--accent);
}

.article {
  background: rgba(0, 0, 0, 0.3);
  padding: 2rem;
  border-radius: 12px;
  margin-bottom: 3rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.article h2 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  color: var(--accent);
  position: relative;
  padding-bottom: 0.5rem;
}

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

.article h3 {
  font-size: 1.5rem;
  margin: 2rem 0 1rem;
  color: var(--text);
}

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

.article pre {
  background: rgba(0, 0, 0, 0.5);
  padding: 1.5rem;
  border-radius: 8px;
  overflow-x: auto;
  margin: 2rem 0;
  border-left: 4px solid var(--accent);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.article code {
  font-family: 'Courier New', monospace;
  color: var(--accent);
}

.article span {
  color: var(--accent);
  font-weight: 500;
}

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

.gallery-item {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
  transition: var(--transition);
}

.gallery-item:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.4);
}

.gallery-item img {
  width: 100%;
  height: 300px;
  object-fit: cover;
  transition: var(--transition);
}

.gallery-item:hover img {
  transform: scale(1.05);
}

.footer {
  background: rgba(0, 0, 0, 0.7);
  padding: 3rem 0;
  margin-top: 4rem;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  padding: 0 2rem;
}

.footer-section h3 {
  color: var(--accent);
  margin-bottom: 1.5rem;
  font-size: 1.3rem;
}

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

.footer-links {
  list-style: none;
  padding: 0;
}

.footer-links li {
  margin-bottom: 0.8rem;
}

.footer-links a {
  color: var(--text);
  text-decoration: none;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--accent);
  padding-left: 5px;
}

.copyright {
  text-align: center;
  padding-top: 2rem;
  margin-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .article {
    padding: 1.5rem;
  }
  
  .gallery {
    grid-template-columns: 1fr;
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-15px);
  }
}

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

.scroll-indicator {
  position: fixed;
  right: 2rem;
  bottom: 2rem;
  background: var(--accent);
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  box-shadow: 0 5px 15px rgba(0, 198, 255, 0.4);
  transition: var(--transition);
  z-index: 100;
}

.scroll-indicator:hover {
  transform: scale(1.1);
  box-shadow: 0 8px 20px rgba(0, 198, 255, 0.6);
}

.scroll-indicator svg {
  width: 24px;
  height: 24px;
  fill: white;
}