body {
    margin: 0;
    font-family: 'Segoe UI', sans-serif;
    background-color: #0d1117;
    color: #ffffff;
  }
  
  header {
    padding: 20px 40px;
    background: #161b22;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .logo-bar {
    display: flex;
    align-items: center;
    gap: 20px;
  }
  
  .logo {
    height: 40px;
  }
  .opennlg{
    height: 45px !important;
  }
  
  nav ul {
    list-style: none;
    display: flex;
    gap: 30px;
    padding: 0;
    margin: 0;
  }
  
  nav li {
    cursor: pointer;
    font-size: 16px;
    color: #c9d1d9;
  }
  
  nav a.github-link {
    color: #58a6ff;
    text-decoration: none;
  }
  
  .hero {
    text-align: center;
    padding: 80px 20px;
    background: linear-gradient(to right, #0d1117, #1f2937);
  }
  
  .hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
  }
  
  .subtext {
    font-size: 20px;
    color: #8b949e;
  }
  
  .buttons {
    margin-top: 30px;
  }
  
  .btn {
    padding: 12px 24px;
    border: none;
    cursor: pointer;
    font-size: 16px;
    margin: 0 10px;
    border-radius: 6px;
    text-decoration: none;
  }
  
  .btn.primary {
    background-color: #00b4ff;
    color: #fff;
  }
  
  .btn:hover {
    opacity: 0.9;
  }
  
  .code-demo {
    padding: 60px 20px;
    background-color: #161b22;
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  
  .demo-container {
    display: flex;
    /* gap: 40px; */
    align-items: flex-start;
    justify-content: center;
    flex-wrap: wrap;
    width: 90%;
    max-width: 1000px;
    margin: 0 auto;
  }
  
  .demo-tabs {
    display: flex;
    flex-direction: column;
    gap: 15px;
  }
  
  .tab {
    flex: 1;
    padding: 12px 20px;
    min-width: 160px;
    text-align: center;
    background-color: #0d1117;
    border: 1px solid #30363d;
    border-bottom: none;
    color: #c9d1d9;
    cursor: pointer;
    transition: background 0.3s;
    font-size: 16px;
  
    /* 默认：无圆角 */
    border-radius: 0;
  }
  
  /* 左上角圆角：第一个 tab */
  .tab:first-child {
    border-top-left-radius: 10px;
  }
  
  /* 右上角圆角：最后一个 tab */
  .tab:last-child {
    border-top-right-radius: 10px;
  }
  
  
  .tab:hover {
    background-color: #21262d;
  }
  
  .tab.active {
    background-color: #00b4ff;
    color: #fff;
  }
  
  .demo-container {
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
  }
  
  .demo-tabs {
    display: flex;
    flex-direction: row;  /* 横向排列 */
    justify-content: flex-start;
    gap: 0px;              /* 去除间隔，靠在一起 */
    border-radius: 10px 10px 0 0;
    overflow: hidden;
  }
  
  .tab {
    flex: 1;
    padding: 12px 20px;
    min-width: 160px;
    text-align: center;
    background-color: #0d1117;
    border: 1px solid #30363d;
    border-bottom: none;
    color: #c9d1d9;
    cursor: pointer;
    transition: background 0.3s;
    font-size: 16px;
  }
  
  .tab.active {
    background-color: #2f81f7;
    color: #fff;
  }
  
  .tab:hover {
    background-color: #21262d;
  }
  
  .tab.active {
    background-color: #00b4ff;
    color: #fff;
  }
  
  .demo-video{
    width: 100%;
  }
  
  .demo-video video {
    width: 100%;
    border-radius: 10px;
    border-top-left-radius: 0px;
    border: 1px solid #30363d;
    box-shadow: 0 0 12px rgba(0, 180, 255, 0.15);
  }
  
  @media (max-width: 768px) {
    .demo-tabs {
      flex-direction: column;
      align-items: center;
    }
  
    .tab {
      width: 80%;
    }
  
    .demo-video video {
      width: 100%;
    }
  }
  
  
  footer {
    text-align: center;
    padding: 20px;
    background-color: #0d1117;
    font-size: 14px;
    color: #6e7681;
  }
  
  footer a.github-link {
    color: #58a6ff;
    text-decoration: none;
  }
  

  /* 图标和文字间距 */
.btn i {
    margin-right: 8px;
  }
  
  /* GitHub 按钮配色 */
  .btn.github {
    background-color: #21262d;
    color: #ffffff;
    border: 1px solid #30363d;
  }
  
  .btn.github:hover {
    background-color: #30363d;
  }
  
  .hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
    background: linear-gradient(to right, #5199d0, #70ffbc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .btn.download-btn {
    background: linear-gradient(to right, #3685c9, #4cc18a);
    color: #fff;
    padding: 12px 24px;
    font-size: 16px;
    border: none;
    border-radius: 6px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none; /* ✅ 去除下划线 */
    cursor: pointer;
    transition: background-color 0.3s;
  }
  
  .btn.download-btn:hover {
    background-color: #2f6db7;
  }
  
  
  .btn.github {
    background-color: #21262d;
    color: #ffffff;
    border: 1px solid #3c4f5f;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
  
  .btn i {
    margin-right: 8px;
  }
  

  .codura-header {
    padding: 16px 40px;
    background: rgba(15, 25, 35, 0.9);
    backdrop-filter: blur(6px);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(80, 240, 179, 0.1);
    box-shadow: 0 2px 10px rgba(0, 255, 170, 0.05);
  }
  
  .logo-bar {
    display: flex;
    align-items: center;
    gap: 16px;
  }
  
  .logo {
    height: 36px;
    transition: transform 0.3s;
  }
  .logo:hover {
    transform: scale(1.05);
  }
  
  .nav-list {
    list-style: none;
    display: flex;
    gap: 28px;
    margin: 0;
    padding: 0;
  }
  
  .nav-list li {
    font-size: 15px;
    color: #cbdce7;
    cursor: pointer;
    transition: color 0.3s;
  }
  
  .nav-list li:hover {
    color: #50f0b3;
  }

  .nav-list a {
    text-decoration: none;
    color: #cbdce7;
    font-size: 15px;
    transition: color 0.3s;
    display: inline-block;
    padding: 4px 0;
  }
  
  .nav-list a:hover {
    color: #50f0b3;
  }