:root {
  --primary-color: #1E90FF;
  --secondary-color: #FFA500;
  --accent-color: #32CD32;
  --bg-gradient: linear-gradient(135deg, #ffffff 0%, #f5f7fa 100%);
  --text-color: #333;
  --light-gray: #f0f0f0;
  --dark-gray: #444;
  --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

body {
  font-family: 'Montserrat', 'Open Sans', sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background: var(--bg-gradient);
  overflow-x: hidden;
}

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

header {
  position: relative;
  height: 80vh;
  min-height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: linear-gradient(rgba(30, 144, 255, 0.8), rgba(30, 144, 255, 0.6)), 
              url('https://images.gptkong.com/demo/sample1.png') center/cover no-repeat;
  color: white;
  clip-path: polygon(0 0, 100% 0, 100% 90%, 0 100%);
  margin-bottom: 80px;
}

.header-content {
  max-width: 800px;
  padding: 0 20px;
  animation: fadeIn 1.5s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

h1 {
  font-size: 3.5rem;
  margin-bottom: 20px;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.header-subtitle {
  font-size: 1.5rem;
  margin-bottom: 30px;
  font-weight: 300;
}

.note-banner {
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  padding: 15px;
  border-radius: 8px;
  margin: 30px auto;
  max-width: 600px;
  font-weight: bold;
}

nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(30, 144, 255, 0.95);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  transition: var(--transition);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: white;
  text-decoration: none;
}

.nav-links {
  display: flex;
  list-style: none;
}

.nav-links li {
  margin-left: 30px;
}

.nav-links a {
  color: white;
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

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

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

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

main {
  padding-bottom: 80px;
}

.section {
  margin-bottom: 80px;
  padding: 40px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 50px;
  position: relative;
}

.section-title h2 {
  font-size: 2.5rem;
  color: var(--primary-color);
  display: inline-block;
  padding: 0 20px;
  background: linear-gradient(to right, var(--primary-color), var(--accent-color));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.section-title::before,
.section-title::after {
  content: '';
  position: absolute;
  top: 50%;
  width: 30%;
  height: 2px;
  background: linear-gradient(to right, transparent, var(--primary-color));
}

.section-title::before {
  left: 0;
}

.section-title::after {
  right: 0;
  background: linear-gradient(to left, transparent, var(--primary-color));
}

.content-block {
  background: white;
  border-radius: 12px;
  padding: 40px;
  box-shadow: var(--box-shadow);
  margin-bottom: 40px;
  transition: var(--transition);
}

.content-block:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
}

h2 {
  font-size: 2rem;
  margin-bottom: 20px;
  color: var(--primary-color);
}

h3 {
  font-size: 1.5rem;
  margin: 30px 0 15px;
  color: var(--secondary-color);
}

p {
  margin-bottom: 20px;
  font-size: 1.1rem;
  line-height: 1.8;
}

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

.img-box {
  flex: 1 1 300px;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  transition: var(--transition);
}

.img-box:hover {
  transform: scale(1.03);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.img-box img {
  width: 100%;
  height: auto;
  display: block;
  transition: var(--transition);
}

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

pre {
  background: #282c34;
  border-radius: 8px;
  padding: 20px;
  margin: 20px 0;
  overflow-x: auto;
  box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.5);
}

code {
  font-family: 'Fira Code', monospace;
  color: #abb2bf;
  font-size: 0.9rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 30px 0;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  border-radius: 8px;
  overflow: hidden;
}

th, td {
  padding: 15px;
  text-align: left;
  border-bottom: 1px solid #ddd;
}

th {
  background-color: var(--primary-color);
  color: white;
  font-weight: 500;
}

tr:nth-child(even) {
  background-color: #f9f9f9;
}

tr:hover {
  background-color: #f1f1f1;
}

footer {
  background: linear-gradient(to right, var(--primary-color), var(--accent-color));
  color: white;
  padding: 50px 0;
  text-align: center;
  clip-path: polygon(0 20%, 100% 0, 100% 100%, 0 100%);
}

.footer-content {
  max-width: 800px;
  margin: 0 auto;
}

.footer-links {
  display: flex;
  justify-content: center;
  list-style: none;
  margin: 30px 0;
}

.footer-links li {
  margin: 0 15px;
}

.footer-links a {
  color: white;
  text-decoration: none;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--secondary-color);
}

@media (max-width: 768px) {
  header {
    height: 70vh;
    min-height: 400px;
  }
  
  h1 {
    font-size: 2.5rem;
  }
  
  .header-subtitle {
    font-size: 1.2rem;
  }
  
  .nav-container {
    flex-direction: column;
  }
  
  .nav-links {
    margin-top: 15px;
  }
  
  .nav-links li {
    margin-left: 15px;
  }
  
  .section-title h2 {
    font-size: 2rem;
  }
  
  .content-block {
    padding: 30px;
  }
}

@media (max-width: 480px) {
  header {
    height: 60vh;
    min-height: 300px;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  .header-subtitle {
    font-size: 1rem;
  }
  
  .section-title h2 {
    font-size: 1.8rem;
  }
  
  .content-block {
    padding: 20px;
  }
  
  .img-box {
    flex: 1 1 100%;
  }
}