:root {
  --primary: linear-gradient(135deg, #4a00e0 0%, #8e2de2 100%);
  --secondary: linear-gradient(45deg, #ff6a00 0%, #ee0979 100%);
  --accent: #23d5ab;
  --text: #2d3748;
  --light: #f8f9fa;
  --dark: #1a202c;
  --radius: 12px;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

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

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

.header {
  background: var(--primary);
  color: white;
  padding: 1.5rem 0;
  position: relative;
  z-index: 100;
  box-shadow: var(--shadow);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 1px;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: white;
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

.nav-links a:hover {
  opacity: 0.8;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: white;
  transition: var(--transition);
}

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

.hero {
  padding: 5rem 0;
  text-align: center;
  background: linear-gradient(rgba(255,255,255,0.9), rgba(255,255,255,0.9)), 
              url('https://images.gptkong.com/demo/sample1.png') center/cover no-repeat;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 1.5rem;
  background: var(--primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

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

.notice {
  background: var(--accent);
  color: white;
  padding: 1rem;
  border-radius: var(--radius);
  margin: 2rem auto;
  max-width: 600px;
  text-align: center;
  font-weight: 500;
  box-shadow: var(--shadow);
}

.content {
  padding: 4rem 0;
}

article {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px;
}

article h2 {
  font-size: 2rem;
  margin: 3rem 0 1.5rem;
  background: var(--primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

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

.card {
  background: white;
  border-radius: var(--radius);
  padding: 2rem;
  margin: 2rem 0;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

pre {
  background: #2d3748;
  color: #f8f9fa;
  padding: 1.5rem;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 1.5rem 0;
  font-family: 'Fira Code', monospace;
  font-size: 0.9rem;
  line-height: 1.6;
}

code {
  font-family: 'Fira Code', monospace;
  background: rgba(45,55,72,0.1);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-size: 0.9rem;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.gallery img {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: var(--transition);
}

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

.footer {
  background: var(--dark);
  color: white;
  padding: 3rem 0;
  text-align: center;
}

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

@media (max-width: 768px) {
  .nav {
    flex-direction: column;
    gap: 1rem;
  }
  
  .nav-links {
    gap: 1rem;
  }
  
  .hero h1 {
    font-size: 2.2rem;
  }
  
  article h2 {
    font-size: 1.8rem;
  }
  
  article h3 {
    font-size: 1.3rem;
  }
}

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

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