:root {
  --primary: #0f2027;
  --secondary: #203a43;
  --accent: #2c5364;
  --highlight: #ff7b25;
  --text: #ffffff;
  --light-bg: rgba(255, 255, 255, 0.1);
}

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

body {
  font-family: 'Open Sans', 'Arial', sans-serif;
  background: linear-gradient(135deg, var(--primary), var(--secondary), var(--accent));
  color: var(--text);
  line-height: 1.6;
  font-size: 17px;
  overflow-x: hidden;
}

header {
  text-align: center;
  padding: 80px 20px 40px;
  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 no-repeat;
  opacity: 0.2;
  z-index: -1;
}

h1, h2, h3, h4 {
  font-weight: 600;
  margin-bottom: 20px;
  line-height: 1.3;
}

h1 {
  font-size: 2.8rem;
  background: linear-gradient(90deg, #fff, #ff7b25);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

h2 {
  font-size: 2rem;
  color: var(--highlight);
  margin-top: 50px;
  position: relative;
  padding-bottom: 15px;
}

h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 80px;
  height: 3px;
  background: linear-gradient(90deg, var(--highlight), transparent);
}

h3 {
  font-size: 1.5rem;
  margin-top: 30px;
  color: #fff;
}

p {
  margin-bottom: 20px;
}

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

.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(15, 32, 39, 0.9);
  padding: 15px 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
  box-shadow: 0 5px 30px rgba(0,0,0,0.3);
  transition: all 0.3s ease;
}

.navbar:hover {
  background: rgba(15, 32, 39, 1);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.nav-links {
  display: flex;
  gap: 30px;
}

.nav-links a {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  position: relative;
  padding: 5px 0;
  transition: all 0.3s ease;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--highlight);
  transition: width 0.3s ease;
}

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

.notice {
  background: rgba(255,255,255,0.1);
  padding: 15px;
  border-radius: 5px;
  margin: 20px 0;
  border-left: 4px solid var(--highlight);
}

.content-section {
  padding: 60px 0;
  position: relative;
}

.content-section:nth-child(even) {
  background: rgba(0,0,0,0.1);
}

.grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
  gap: 30px;
  margin: 40px 0;
}

.card {
  background: var(--light-bg);
  border-radius: 10px;
  padding: 30px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

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

.img-container {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin: 30px 0;
  justify-content: center;
}

.img-box {
  width: 320px;
  height: 320px;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 10px 20px rgba(0,0,0,0.2);
  transition: all 0.3s ease;
}

.img-box:hover {
  transform: scale(1.05);
  box-shadow: 0 15px 30px rgba(0,0,0,0.3);
}

.img-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.img-box:hover img {
  transform: scale(1.1);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 30px 0;
  background: rgba(255,255,255,0.05);
  border-radius: 10px;
  overflow: hidden;
}

th, td {
  padding: 15px;
  text-align: left;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

th {
  background: rgba(255,255,255,0.1);
  font-weight: 600;
}

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

pre {
  background: rgba(0,0,0,0.3);
  padding: 20px;
  border-radius: 5px;
  overflow-x: auto;
  margin: 20px 0;
  border-left: 4px solid var(--highlight);
  font-size: 15px;
  line-height: 1.5;
}

code {
  font-family: 'Courier New', monospace;
  color: #ff7b25;
}

.tech-highlight {
  background: rgba(255,123,37,0.1);
  padding: 2px 5px;
  border-radius: 3px;
  font-family: monospace;
}

footer {
  text-align: center;
  padding: 40px 20px;
  background: rgba(0,0,0,0.3);
  margin-top: 60px;
}

@media (max-width: 768px) {
  .grid-container {
    grid-template-columns: 1fr;
  }
  
  .nav-links {
    gap: 15px;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  h3 {
    font-size: 1.2rem;
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-20px);
  }
}

.floating {
  animation: float 6s ease-in-out infinite;
}