:root {
    --primary: #6A5ACD;
    --secondary: #FF8C00;
    --accent: #32CD32;
    --dark: #333333;
    --light: #ffffff;
    --gradient: linear-gradient(135deg, var(--primary), #836FFF);
    --shadow: 0 4px 20px 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: 'Roboto', sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: var(--gradient);
    background-attachment: fixed;
    overflow-x: hidden;
  }

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

  .design-notice {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(255,255,255,0.9);
    padding: 10px 20px;
    border-radius: 30px;
    box-shadow: var(--shadow);
    z-index: 1000;
    font-size: 14px;
    color: var(--primary);
  }

  header {
    padding: 100px 0 60px;
    text-align: center;
    position: relative;
  }

  header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://images.gptkong.com/demo/sample3.png') center/cover no-repeat;
    opacity: 0.1;
    z-index: -1;
  }

  h1, h2, h3, h4 {
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.3;
  }

  h1 {
    font-size: 2.8rem;
    color: var(--light);
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
    margin-bottom: 30px;
  }

  h2 {
    font-size: 2rem;
    color: var(--light);
    padding: 15px 0;
    border-bottom: 2px solid rgba(255,255,255,0.2);
    margin-top: 60px;
  }

  h3 {
    font-size: 1.5rem;
    color: var(--secondary);
    margin-top: 40px;
  }

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

  article {
    background: rgba(255,255,255,0.95);
    border-radius: 20px;
    padding: 40px;
    margin: 40px 0;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
  }

  article::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(106,90,205,0.1) 0%, transparent 70%);
    z-index: -1;
    animation: rotate 60s linear infinite;
  }

  @keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }

  .content-block {
    margin-bottom: 60px;
    position: relative;
    padding: 30px;
    background: var(--light);
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    transition: var(--transition);
  }

  .content-block:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.1);
  }

  .content-block::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background: var(--gradient);
    border-radius: 15px 0 0 15px;
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin: 40px 0;
  }

  .image-card {
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
  }

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

  .image-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
  }

  .image-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, transparent 60%, rgba(0,0,0,0.7));
  }

  pre {
    background: #282c34;
    color: #abb2bf;
    padding: 20px;
    border-radius: 10px;
    overflow-x: auto;
    margin: 25px 0;
    font-size: 0.9rem;
    line-height: 1.5;
    position: relative;
  }

  pre::before {
    content: 'CSS';
    position: absolute;
    top: 0;
    left: 0;
    background: var(--secondary);
    color: white;
    padding: 2px 10px;
    border-radius: 0 0 5px 0;
    font-size: 0.8rem;
  }

  code {
    font-family: 'Fira Code', monospace;
  }

  .nav-tabs {
    display: flex;
    justify-content: center;
    margin: 40px 0;
    flex-wrap: wrap;
    gap: 10px;
  }

  .nav-tab {
    padding: 10px 25px;
    background: rgba(255,255,255,0.2);
    border-radius: 30px;
    color: white;
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
  }

  .nav-tab:hover {
    background: rgba(255,255,255,0.4);
    transform: translateY(-3px);
  }

  .highlight {
    background: linear-gradient(45deg, var(--secondary), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-weight: 700;
  }

  .floating-shapes {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: -1;
    overflow: hidden;
  }

  .shape {
    position: absolute;
    opacity: 0.1;
    border-radius: 50%;
    filter: blur(20px);
  }

  .shape-1 {
    width: 300px;
    height: 300px;
    background: var(--primary);
    top: 10%;
    left: 5%;
    animation: float 15s ease-in-out infinite;
  }

  .shape-2 {
    width: 200px;
    height: 200px;
    background: var(--secondary);
    top: 60%;
    left: 70%;
    animation: float 12s ease-in-out infinite reverse;
  }

  .shape-3 {
    width: 150px;
    height: 150px;
    background: var(--accent);
    top: 30%;
    left: 80%;
    animation: float 18s ease-in-out infinite 2s;
  }

  @keyframes float {
    0%, 100% { transform: translate(0, 0); }
    25% { transform: translate(50px, 50px); }
    50% { transform: translate(0, 100px); }
    75% { transform: translate(-50px, 50px); }
  }

  footer {
    text-align: center;
    padding: 40px 0;
    color: rgba(255,255,255,0.8);
    font-size: 0.9rem;
  }

  @media (max-width: 768px) {
    h1 {
      font-size: 2rem;
    }
    h2 {
      font-size: 1.6rem;
    }
    .content-block {
      padding: 20px;
    }
    .image-grid {
      grid-template-columns: 1fr;
    }
  }