:root {
  --primary-color: #FF9900;
  --secondary-color: #FFC2C2;
  --background-color: #F5F5F5;
  --accent-color: #6C63FF;
  --text-color: #333;
  --light-gray: #E0E0E0;
  --white: #FFFFFF;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.15);
}

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

body {
  font-family: 'Helvetica Neue', sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
  padding-top: 80px;
}

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: linear-gradient(135deg, var(--white) 0%, #f9f9f9 100%);
  box-shadow: var(--shadow-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 5%;
  z-index: 1000;
}

.navbar .logo {
  font-family: 'Roboto', sans-serif;
  font-weight: 700;
  font-size: 24px;
  color: var(--primary-color);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 10px;
}

.navbar .logo::before {
  content: "";
  display: inline-block;
  width: 30px;
  height: 30px;
  background: url('https://images.gptkong.com/demo/sample1.png') center/cover no-repeat;
  border-radius: 50%;
  box-shadow: var(--shadow-sm);
}

.navbar .nav-links {
  display: flex;
  gap: 25px;
}

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

.navbar .nav-links a:hover {
  color: var(--primary-color);
}

.navbar .nav-links a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: width 0.3s ease;
}

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

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

.hero {
  background: linear-gradient(135deg, rgba(255, 153, 0, 0.1) 0%, rgba(255, 194, 194, 0.1) 100%);
  border-radius: 16px;
  padding: 60px;
  margin: 40px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50px;
  right: -50px;
  width: 200px;
  height: 200px;
  background: url('https://images.gptkong.com/demo/sample2.png') center/cover no-repeat;
  opacity: 0.2;
  z-index: -1;
}

.hero h1 {
  font-family: 'Roboto', sans-serif;
  font-size: 2.5rem;
  color: var(--primary-color);
  margin-bottom: 20px;
  font-weight: 700;
}

.hero p {
  font-size: 1.1rem;
  max-width: 800px;
  margin: 0 auto 30px;
  color: var(--text-color);
}

.notice {
  background-color: var(--white);
  padding: 15px;
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  display: inline-block;
  margin-bottom: 30px;
  font-weight: 500;
  color: var(--primary-color);
}

.content-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  margin: 60px 0;
}

.section {
  background-color: var(--white);
  border-radius: 12px;
  padding: 40px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
  overflow: hidden;
}

.section:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.section::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

.section h2 {
  font-family: 'Roboto', sans-serif;
  font-size: 1.8rem;
  color: var(--primary-color);
  margin-bottom: 25px;
  position: relative;
  display: inline-block;
}

.section h2::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 50px;
  height: 3px;
  background: var(--secondary-color);
}

.section h3 {
  font-family: 'Roboto', sans-serif;
  font-size: 1.4rem;
  color: var(--accent-color);
  margin: 25px 0 15px;
}

.section p {
  margin-bottom: 20px;
  font-size: 1.05rem;
}

.section img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  margin: 20px 0;
  transition: transform 0.3s ease;
}

.section img:hover {
  transform: scale(1.02);
}

.color-sample {
  display: inline-block;
  width: 20px;
  height: 20px;
  border-radius: 4px;
  vertical-align: middle;
  margin: 0 5px;
  box-shadow: var(--shadow-sm);
}

pre {
  background: #2d2d2d;
  border-radius: 8px;
  padding: 20px;
  margin: 25px 0;
  overflow-x: auto;
  color: #f8f8f2;
  font-family: 'Courier New', monospace;
  font-size: 0.95rem;
  line-height: 1.5;
  position: relative;
}

pre::before {
  content: 'CSS';
  position: absolute;
  top: 0;
  left: 0;
  background: var(--primary-color);
  color: white;
  padding: 2px 10px;
  border-radius: 0 0 4px 0;
  font-size: 0.8rem;
}

code {
  font-family: 'Courier New', monospace;
  background-color: rgba(255, 153, 0, 0.1);
  padding: 2px 5px;
  border-radius: 3px;
  font-size: 0.9rem;
}

.card-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  margin: 30px 0;
}

.card {
  background: var(--white);
  border-radius: 8px;
  padding: 25px;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
  border-left: 4px solid var(--primary-color);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.card h4 {
  font-family: 'Roboto', sans-serif;
  color: var(--primary-color);
  margin-bottom: 15px;
}

.footer {
  background: linear-gradient(135deg, var(--white) 0%, #f9f9f9 100%);
  padding: 40px 0;
  margin-top: 80px;
  border-top: 1px solid var(--light-gray);
  text-align: center;
}

.footer p {
  color: var(--text-color);
  margin-bottom: 20px;
}

.footer .social-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 20px;
}

.footer .social-links a {
  display: inline-block;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--primary-color);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: all 0.3s ease;
}

.footer .social-links a:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
}

@media (max-width: 768px) {
  .navbar {
    padding: 15px 20px;
  }
  
  .hero {
    padding: 40px 20px;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .section {
    padding: 30px;
  }
}

@media (max-width: 480px) {
  .navbar .nav-links {
    gap: 15px;
  }
  
  .hero {
    padding: 30px 15px;
  }
  
  .section {
    padding: 25px 15px;
  }
  
  .card-container {
    grid-template-columns: 1fr;
  }
}