:root {
  --primary-bg: #121212;
  --secondary-bg: #1E1E1E;
  --accent-blue: #00FFFF;
  --accent-green: #39FF14;
  --accent-purple: #8A2BE2;
  --text-primary: #FFFFFF;
  --text-secondary: #B0B0B0;
}

body {
  background-color: var(--primary-bg);
  color: var(--text-primary);
  font-family: 'Montserrat', 'Segoe UI', sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  min-height: 100%;
}

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

.header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('https://images.gptkong.com/demo/sample1.png') center/cover no-repeat;
  opacity: 0.1;
  z-index: 0;
}

.header-content {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.note {
  background-color: var(--accent-purple);
  color: white;
  padding: 1rem;
  border-radius: 8px;
  margin: 2rem auto;
  max-width: 800px;
  text-align: center;
  box-shadow: 0 4px 20px rgba(138, 43, 226, 0.3);
  font-weight: bold;
}

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

.article-container {
  background-color: var(--secondary-bg);
  border-radius: 16px;
  padding: 3rem;
  margin: 3rem 0;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

h1, h2, h3, h4 {
  color: var(--text-primary);
  font-weight: 600;
  margin-top: 2rem;
}

h1 {
  font-size: 2.5rem;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-green));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 1.5rem;
}

h2 {
  font-size: 1.8rem;
  border-left: 5px solid var(--accent-blue);
  padding-left: 1rem;
  margin-bottom: 1.5rem;
}

h3 {
  font-size: 1.4rem;
  color: var(--accent-green);
  margin-bottom: 1rem;
}

p {
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
}

pre {
  background-color: #000;
  border-radius: 8px;
  padding: 1.5rem;
  overflow-x: auto;
  margin: 2rem 0;
  border: 1px solid rgba(0, 255, 255, 0.2);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

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

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

.card {
  background: linear-gradient(145deg, var(--secondary-bg), #252525);
  border-radius: 12px;
  padding: 2rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
  overflow: hidden;
}

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

.card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
}

.img-container {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  margin: 3rem 0;
}

.img-box {
  width: 150px;
  height: 150px;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
  transition: transform 0.3s ease;
}

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

.img-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.nav-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin: 2rem 0;
  flex-wrap: wrap;
}

.nav-link {
  color: var(--text-primary);
  text-decoration: none;
  padding: 0.8rem 1.5rem;
  border-radius: 30px;
  background: rgba(0, 255, 255, 0.1);
  border: 1px solid var(--accent-blue);
  transition: all 0.3s ease;
  font-weight: 500;
}

.nav-link:hover {
  background: var(--accent-blue);
  color: var(--primary-bg);
  transform: translateY(-3px);
  box-shadow: 0 5px 15px rgba(0, 255, 255, 0.3);
}

@media (max-width: 768px) {
  .container, .header-content {
    padding: 0 1.5rem;
  }
  
  .article-container {
    padding: 2rem;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .container, .header-content {
    padding: 0 1rem;
  }
  
  .article-container {
    padding: 1.5rem;
  }
  
  h1 {
    font-size: 1.8rem;
  }
  
  .img-box {
    width: 120px;
    height: 120px;
  }
}

.particle {
  position: fixed;
  width: 2px;
  height: 2px;
  background-color: var(--accent-blue);
  border-radius: 50%;
  opacity: 0.5;
  animation: float 15s linear infinite;
  z-index: -1;
}

@keyframes float {
  0% {
    transform: translateY(0) translateX(0);
    opacity: 0;
  }
  10% {
    opacity: 0.5;
  }
  90% {
    opacity: 0.5;
  }
  100% {
    transform: translateY(-100vh) translateX(100px);
    opacity: 0;
  }
}

.toggle-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s ease;
}

.toggle-btn {
  background: none;
  border: none;
  color: var(--accent-green);
  cursor: pointer;
  font-size: 1rem;
  padding: 0.5rem 1rem;
  margin: 1rem 0;
  display: inline-flex;
  align-items: center;
}

.toggle-btn::after {
  content: "↓";
  margin-left: 0.5rem;
  transition: transform 0.3s ease;
}

.toggle-btn.active::after {
  transform: rotate(180deg);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
}

th, td {
  padding: 12px 15px;
  text-align: left;
  border-bottom: 1px solid rgba(57, 255, 20, 0.2);
}

th {
  background-color: rgba(0, 0, 0, 0.3);
  color: var(--accent-green);
}

tr:hover {
  background-color: rgba(0, 255, 255, 0.05);
}