:root {
    --primary-bg: #121212;
    --secondary-bg: #1E1E1E;
    --accent-bg: #2C2C2C;
    --primary-text: #FFFFFF;
    --secondary-text: #B0B0B0;
    --success: #4CAF50;
    --error: #FF5252;
    --warning: #FFC107;
    --highlight: #2196F3;
    --border-radius: 8px;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  }

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

  body {
    background: var(--primary-bg);
    color: var(--primary-text);
    font-family: 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    padding: 0;
    margin: 0;
    overflow-x: hidden;
  }

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

  .header {
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
    padding: 2rem 0;
    background: linear-gradient(135deg, var(--secondary-bg) 0%, var(--primary-bg) 100%);
    border-radius: var(--border-radius);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  }

  .header::after {
    content: "这是一个网页样式设计参考";
    position: absolute;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.9rem;
    color: var(--secondary-text);
    opacity: 0.7;
  }

  h1, h2, h3, h4 {
    font-weight: 600;
    margin-bottom: 1.5rem;
    line-height: 1.3;
  }

  h1 {
    font-size: 2.5rem;
    background: linear-gradient(90deg, var(--highlight), #64B5F6);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 1rem;
  }

  h2 {
    font-size: 1.8rem;
    color: var(--highlight);
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent-bg);
    margin-top: 3rem;
  }

  h3 {
    font-size: 1.5rem;
    color: var(--primary-text);
    margin-top: 2rem;
  }

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

  a {
    color: var(--highlight);
    text-decoration: none;
    transition: var(--transition);
  }

  a:hover {
    color: #64B5F6;
    text-decoration: underline;
  }

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

  .card {
    background: var(--secondary-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
    border-left: 4px solid var(--highlight);
  }

  .card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
  }

  .decorative-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: var(--border-radius);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
    filter: grayscale(30%);
  }

  .decorative-img:hover {
    transform: scale(1.03);
    filter: grayscale(0%);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
  }

  pre {
    background: var(--accent-bg);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    overflow-x: auto;
    margin: 2rem 0;
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.5);
    border-left: 4px solid var(--highlight);
  }

  code {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: #E0E0E0;
  }

  .success-text {
    color: var(--success);
  }

  .error-text {
    color: var(--error);
  }

  .warning-text {
    color: var(--warning);
  }

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

  .nav-link {
    padding: 0.8rem 1.5rem;
    background: var(--accent-bg);
    border-radius: 30px;
    transition: var(--transition);
    font-weight: 500;
  }

  .nav-link:hover {
    background: var(--highlight);
    color: var(--primary-text);
    text-decoration: none;
    transform: translateY(-2px);
  }

  .accordion {
    margin: 2rem 0;
  }

  .accordion-item {
    margin-bottom: 1rem;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  }

  .accordion-header {
    background: var(--accent-bg);
    padding: 1.2rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
  }

  .accordion-header:hover {
    background: #333;
  }

  .accordion-content {
    background: var(--secondary-bg);
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
  }

  .accordion-content.active {
    padding: 1.2rem;
    max-height: 1000px;
  }

  @media (max-width: 768px) {
    .container {
      padding: 1.5rem;
    }

    h1 {
      font-size: 2rem;
    }

    h2 {
      font-size: 1.5rem;
    }

    .grid {
      grid-template-columns: 1fr;
    }
  }

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

  .floating {
    animation: float 3s ease-in-out infinite;
  }

  @keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
  }

  .pulsing {
    animation: pulse 2s ease-in-out infinite;
  }