@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;600&family=Roboto:wght@700&display=swap');
  
  :root {
    --primary: #0E3A6B;
    --secondary: #5D2B8C;
    --accent: #FF7F50;
    --gold: linear-gradient(45deg, #F9A825, #FFD700);
    --text: #333333;
    --light: #FFFFFF;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  }
  
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: 'Montserrat', sans-serif;
    color: var(--text);
    line-height: 1.6;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
    overflow-x: hidden;
  }
  
  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
  }
  
  .notice {
    background: var(--gold);
    color: var(--light);
    padding: 15px;
    text-align: center;
    font-weight: 600;
    box-shadow: var(--shadow);
    position: relative;
    z-index: 10;
  }
  
  header {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--light);
    padding: 80px 0 60px;
    text-align: center;
    clip-path: polygon(0 0, 100% 0, 100% 90%, 0 100%);
    margin-bottom: 60px;
    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') no-repeat;
    background-size: 30%;
    background-position: right bottom;
    opacity: 0.1;
  }
  
  h1, h2, h3 {
    font-family: 'Roboto', sans-serif;
    color: var(--primary);
    margin-bottom: 20px;
  }
  
  h1 {
    font-size: 2.8rem;
    line-height: 1.2;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
  }
  
  h2 {
    font-size: 2rem;
    position: relative;
    padding-bottom: 15px;
  }
  
  h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 80px;
    height: 4px;
    background: var(--gold);
    border-radius: 2px;
  }
  
  h3 {
    font-size: 1.5rem;
    margin-top: 40px;
  }
  
  p {
    margin-bottom: 20px;
    font-size: 1.1rem;
  }
  
  article {
    background: var(--light);
    border-radius: 15px;
    box-shadow: var(--shadow);
    padding: 40px;
    margin: 40px 0;
    position: relative;
    overflow: hidden;
  }
  
  article::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 200px;
    height: 200px;
    background: var(--gold);
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.1;
    z-index: 0;
  }
  
  .nav-container {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(14, 58, 107, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 15px rgba(0,0,0,0.1);
  }
  
  nav {
    display: flex;
    justify-content: center;
    padding: 15px 0;
  }
  
  nav a {
    color: var(--light);
    text-decoration: none;
    margin: 0 20px;
    font-weight: 600;
    position: relative;
    padding: 5px 0;
    transition: all 0.3s ease;
  }
  
  nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gold);
    transition: width 0.3s ease;
  }
  
  nav a:hover::after {
    width: 100%;
  }
  
  .grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 40px 0;
  }
  
  .card {
    background: var(--light);
    border-radius: 15px;
    padding: 30px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
  }
  
  .card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.15);
  }
  
  .card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background: var(--gold);
  }
  
  .img-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
    margin: 40px 0;
  }
  
  .img-box {
    width: 150px;
    height: 150px;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
  }
  
  .img-box:hover {
    transform: scale(1.05);
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
  }
  
  .img-box img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
  }
  
  .img-box:hover img {
    transform: scale(1.1);
  }
  
  pre {
    background: #2d2d2d;
    color: #f8f8f2;
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 25px 0;
    font-size: 0.95rem;
    line-height: 1.5;
    position: relative;
  }
  
  pre::before {
    content: 'CSS';
    position: absolute;
    top: 0;
    right: 0;
    background: var(--primary);
    color: white;
    padding: 2px 10px;
    border-radius: 0 0 0 5px;
    font-size: 0.8rem;
  }
  
  code {
    font-family: 'Courier New', monospace;
  }
  
  .divider {
    height: 1px;
    background: linear-gradient(to right, transparent, var(--primary), transparent);
    margin: 50px 0;
    position: relative;
  }
  
  .divider::after {
    content: '';
    position: absolute;
    top: -5px;
    left: 50%;
    transform: translateX(-50%);
    width: 10px;
    height: 10px;
    background: var(--gold);
    border-radius: 50%;
  }
  
  .float {
    animation: float 6s ease-in-out infinite;
  }
  
  @keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
  }
  
  .pulse {
    animation: pulse 2s infinite;
  }
  
  @keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(93, 43, 140, 0.4); }
    70% { box-shadow: 0 0 0 15px rgba(93, 43, 140, 0); }
    100% { box-shadow: 0 0 0 0 rgba(93, 43, 140, 0); }
  }
  
  footer {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--light);
    padding: 40px 0;
    text-align: center;
    margin-top: 80px;
    clip-path: polygon(0 10%, 100% 0, 100% 100%, 0 100%);
  }
  
  @media (max-width: 768px) {
    h1 { font-size: 2.2rem; }
    h2 { font-size: 1.8rem; }
    article { padding: 30px 20px; }
    .grid { grid-template-columns: 1fr; }
    nav { flex-wrap: wrap; }
    nav a { margin: 5px 10px; }
  }