:root {
    --primary-blue: #98cfff;
    --accent-orange: #ffcfa3;
    --text-color: #2c2c2c;
    --bg-color: #fefefe;
    --header-bg: #e7f3ff;
    --footer-bg: #fff7f0;
    --index-bg: #eaf6ff;
    --card-bg: #ffffff;
    --shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
  }
  
  body {
    font-family: 'Helvetica Neue', sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    line-height: 1.8;
    font-size: 18px;
  }
  
  body.index {
    background-color: var(--index-bg);
  }
  
  header {
    background-color: var(--header-bg);
    padding: 2em 1em;
    text-align: center;
    border-bottom: 2px solid var(--primary-blue);
    box-shadow: var(--shadow);
  }
  
  header h1 {
    margin: 0;
    color: #225e91;
    font-size: 2.4em;
    font-weight: 600;
  }
  
  nav {
    margin-top: 10px;
  }
  
  nav a {
    margin: 0 15px;
    text-decoration: none;
    color: #225e91;
    font-weight: bold;
    font-size: 1.1em;
    transition: color 0.3s ease;
  }
  
  nav a:hover {
    color: var(--accent-orange);
  }
  
  main {
    padding: 50px 25px;
    max-width: 1000px;
    margin: auto;
  }
  
  .project {
    margin-bottom: 60px;
  }
  
  .project h2 {
    font-size: 1.8em;
    margin-top: 1em;
    color: #215d89;
  }
  
  .images {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin: 1em 0;
  }
  
  .images img {
    width: 100%;
    max-width: 400px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }
  
  .images img:hover {
    transform: scale(1.03);
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.15);
  }
  
  .download-link {
    display: inline-block;
    margin: 1em 0;
    padding: 12px 22px;
    font-weight: bold;
    font-size: 1em;
    background-color: var(--accent-orange);
    color: #fff;
    text-decoration: none;
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: background-color 0.3s ease;
  }
  
  .download-link:hover {
    background-color: #f4a865;
  }
  
  h2, h3 {
    color: #336fa6;
    border-bottom: 2px solid var(--accent-orange);
    padding-bottom: 6px;
    margin-top: 2em;
    font-size: 1.5em;
  }
  
  ul {
    list-style: disc;
    padding-left: 20px;
  }
  
  img {
    display: block;
    margin: 10px 0;
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  }
  
  .gallery {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
  }
  
  .gallery img {
    max-width: 280px;
  }
  
  a {
    color: var(--primary-blue);
    text-decoration: none;
  }
  
  a:hover {
    color: var(--accent-orange);
  }
  
  footer {
    background: var(--footer-bg);
    padding: 1.2em;
    text-align: center;
    font-size: 0.95em;
    color: #777;
    border-top: 1px solid #eee;
    box-shadow: var(--shadow);
  }