:root {
    --primary-color: #FFC67D;
    --secondary-color: #E8F0FE;
    --white-color: #FFFFFF;
    --highlight-color: #032B44;
    --accent-color: #FF6B6B;
    --dark-bg: #1A1A2E;
    --light-bg: #F8F9FA;
    --text-color: #333333;
    --text-light: #6C757D;
  }

  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Roboto', 'PingFang SC', sans-serif;
  }

  body {
    background: linear-gradient(135deg, var(--secondary-color), var(--white-color));
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
  }

  .header {
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
  }

  .header::after {
    content: '';
    display: block;
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    margin: 1.5rem auto;
    border-radius: 2px;
  }

  h1, h2, h3, h4 {
    color: var(--highlight-color);
    margin-bottom: 1.5rem;
    font-weight: 700;
  }

  h1 {
    font-size: 2.5rem;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    display: inline-block;
  }

  h2 {
    font-size: 1.8rem;
    position: relative;
    padding-left: 1.5rem;
  }

  h2::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.5rem;
    height: 2rem;
    width: 5px;
    background: var(--primary-color);
    border-radius: 3px;
  }

  h3 {
    font-size: 1.5rem;
    color: var(--text-color);
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 0.5rem;
    margin-top: 2rem;
  }

  p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    color: var(--text-color);
  }

  .note {
    background: rgba(255, 198, 125, 0.1);
    border-left: 4px solid var(--primary-color);
    padding: 1.5rem;
    margin: 2rem 0;
    border-radius: 0 4px 4px 0;
  }

  .note p {
    margin-bottom: 0;
  }

  .grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
  }

  .card {
    background: var(--white-color);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
  }

  .card-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  }

  .card-content {
    padding: 1.5rem;
  }

  .card-title {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--highlight-color);
  }

  .card-desc {
    color: var(--text-light);
    font-size: 0.95rem;
  }

  pre {
    background: var(--dark-bg);
    color: #f8f8f2;
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 2rem 0;
    position: relative;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  }

  pre::before {
    content: 'CSS';
    position: absolute;
    top: 0;
    left: 0;
    background: var(--primary-color);
    color: var(--highlight-color);
    padding: 0.3rem 1rem;
    border-radius: 0 0 5px 0;
    font-size: 0.8rem;
    font-weight: bold;
  }

  code {
    font-family: 'Fira Code', monospace;
    font-size: 0.95rem;
  }

  .btn {
    display: inline-block;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.3);
    margin: 1rem 0;
    border: none;
    cursor: pointer;
  }

  .btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(255, 107, 107, 0.4);
  }

  .floating-notice {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--highlight-color);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 50px;
    box-shadow: 0 10px 30px rgba(3, 43, 68, 0.3);
    z-index: 100;
    animation: float 3s ease-in-out infinite;
  }

  @keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
    100% { transform: translateY(0px); }
  }

  .section {
    margin: 4rem 0;
    padding: 2rem;
    background: white;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.03);
  }

  .image-gallery {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin: 2rem 0;
    justify-content: center;
  }

  .gallery-img {
    width: 150px;
    height: 150px;
    object-fit: cover;
    border-radius: 10px;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  }

  .gallery-img:hover {
    transform: scale(1.05);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
  }

  .nav-tabs {
    display: flex;
    border-bottom: 1px solid var(--secondary-color);
    margin-bottom: 2rem;
  }

  .nav-tab {
    padding: 0.8rem 1.5rem;
    cursor: pointer;
    position: relative;
    color: var(--text-light);
    font-weight: 600;
  }

  .nav-tab.active {
    color: var(--highlight-color);
  }

  .nav-tab.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 3px 3px 0 0;
  }

  @media (max-width: 768px) {
    .container {
      padding: 1rem;
    }
    
    h1 {
      font-size: 2rem;
    }
    
    h2 {
      font-size: 1.5rem;
    }
    
    .grid-container {
      grid-template-columns: 1fr;
    }
    
    .section {
      padding: 1.5rem;
    }
  }