:root {
  --primary-bg: #121212;
  --secondary-bg: #1E1E1E;
  --accent-blue: #03A9F4;
  --accent-green: #8BC34A;
  --accent-purple: #673AB7;
  --accent-orange: #FF9800;
  --text-primary: #E0E0E0;
  --text-secondary: #B0BEC5;
}

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

body {
  background-color: var(--primary-bg);
  color: var(--text-primary);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  padding-top: 80px;
}

.header {
  position: fixed;
  top: 0;
  width: 100%;
  background: linear-gradient(135deg, var(--secondary-bg), #2A2A2A);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
  z-index: 1000;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header h1 {
  font-size: 1.5rem;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-green));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-weight: 700;
}

.notice {
  position: fixed;
  top: 80px;
  left: 0;
  width: 100%;
  background-color: var(--accent-orange);
  color: var(--primary-bg);
  text-align: center;
  padding: 0.5rem;
  font-weight: bold;
  z-index: 999;
}

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

.hero {
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
  border-radius: 16px;
  padding: 3rem;
  margin-bottom: 3rem;
  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 center/cover;
  opacity: 0.1;
}

.hero h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  position: relative;
}

.hero p {
  font-size: 1.1rem;
  max-width: 800px;
  position: relative;
}

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

.card {
  background-color: var(--secondary-bg);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.5);
}

.card h3 {
  color: var(--accent-orange);
  margin-bottom: 1rem;
  font-size: 1.3rem;
}

.card p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.card .icon {
  width: 60px;
  height: 60px;
  margin-bottom: 1rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
}

.card .icon img {
  width: 40px;
  height: 40px;
  filter: drop-shadow(0 0 5px rgba(3, 169, 244, 0.5));
}

article {
  background-color: var(--secondary-bg);
  border-radius: 16px;
  padding: 3rem;
  margin: 3rem 0;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

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

article h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100px;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-blue), transparent);
}

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

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

pre {
  background-color: #0D0D0D;
  border-radius: 8px;
  padding: 1.5rem;
  margin: 1.5rem 0;
  overflow-x: auto;
  border-left: 4px solid var(--accent-blue);
}

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

.footer {
  background-color: var(--secondary-bg);
  padding: 3rem 2rem;
  text-align: center;
  margin-top: 3rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.footer .links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 1.5rem;
}

.footer a {
  color: var(--accent-orange);
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer a:hover {
  color: var(--accent-blue);
}

@media (max-width: 768px) {
  .header {
    flex-direction: column;
    padding: 1rem;
  }
  
  .hero {
    padding: 2rem 1.5rem;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
  }
  
  article {
    padding: 2rem 1.5rem;
  }
}

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

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

.glow {
  text-shadow: 0 0 10px rgba(3, 169, 244, 0.5);
}