:root {
  --primary: #0f0c29;
  --secondary: #302b63;
  --accent: #00a8ff;
  --text: #e0e0e0;
  --card-bg: #1e1e1e;
  --success: #28a745;
}

body {
  font-family: 'Montserrat', sans-serif;
  background: var(--primary);
  color: var(--text);
  line-height: 1.6;
  margin: 0;
  padding: 0;
  overflow-x: hidden;
}

.header {
  text-align: center;
  padding: 2rem 0;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  position: relative;
  overflow: hidden;
}

.header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('https://images.gptkong.com/demo/sample1.png') center/cover;
  opacity: 0.1;
}

.header h1 {
  font-size: 2.5rem;
  margin: 0;
  background: linear-gradient(90deg, #00a8ff, #00ffaa);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 20px rgba(0, 168, 255, 0.3);
}

.notice {
  background: rgba(0, 168, 255, 0.2);
  padding: 1rem;
  border-radius: 8px;
  margin: 1rem auto;
  max-width: 800px;
  text-align: center;
  border: 1px solid var(--accent);
}

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

article {
  background: rgba(30, 30, 30, 0.8);
  border-radius: 15px;
  padding: 2rem;
  margin-bottom: 3rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

h2, h3, h4 {
  color: var(--accent);
  margin-top: 2rem;
}

h2 {
  font-size: 1.8rem;
  border-bottom: 2px solid var(--secondary);
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
}

h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

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

pre {
  background: #2c2c2c;
  border-radius: 8px;
  padding: 1.5rem;
  overflow: auto;
  margin: 1.5rem 0;
  border-left: 4px solid var(--accent);
}

code {
  font-family: 'Courier New', monospace;
  color: #00ffaa;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  background: var(--card-bg);
  border-radius: 8px;
  overflow: hidden;
}

th, td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid #333;
}

th {
  background: var(--secondary);
  color: white;
}

tr:hover {
  background: rgba(0, 168, 255, 0.1);
}

ol, ul {
  padding-left: 2rem;
  margin: 1.5rem 0;
}

li {
  margin-bottom: 0.8rem;
}

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

.gallery img {
  width: 100%;
  height: auto;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.gallery img:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 168, 255, 0.4);
}

.nav-tabs {
  display: flex;
  flex-wrap: wrap;
  margin: 2rem 0;
  border-bottom: 1px solid #333;
}

.nav-tabs a {
  padding: 1rem 2rem;
  text-decoration: none;
  color: var(--text);
  background: var(--card-bg);
  margin-right: 0.5rem;
  border-radius: 8px 8px 0 0;
  transition: all 0.3s ease;
}

.nav-tabs a:hover {
  background: var(--secondary);
  color: white;
}

.card {
  background: var(--card-bg);
  border-radius: 10px;
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0, 168, 255, 0.2);
}

.footer {
  text-align: center;
  padding: 2rem;
  background: var(--secondary);
  margin-top: 3rem;
}

@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }
  
  article {
    padding: 1.5rem;
  }
  
  .gallery {
    grid-template-columns: 1fr;
  }
  
  .nav-tabs a {
    padding: 0.8rem 1rem;
    margin-bottom: 0.5rem;
  }
  
  h2 {
    font-size: 1.6rem;
  }
  
  h3 {
    font-size: 1.3rem;
  }
}

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

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

.data-line {
  position: absolute;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  animation: flow 6s linear infinite;
}

@keyframes flow {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

.highlight {
  background: rgba(0, 168, 255, 0.2);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  color: var(--accent);
}