header.dbyu_main_header {
      width: 100%;
      border-bottom: 1px solid #ddd;
      background: #fff;
      position: fixed;
      top: 0;
      left: 0;
      z-index: 1000;
    }

    .nav-container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 60px;
    }

    .dbyu_main_header .logo {
      font-size: 28px;
      font-weight: 800;
    }

    .dbyu_main_header nav ul {
      display: flex;
      gap: 25px;
      list-style: none;
    }

    .dbyu_main_header nav ul li {
      position: relative;
    }

    .dbyu_main_header nav ul li a {
      text-decoration: none;
      color: #000;
      font-weight: 600;
      transition: color 0.3s;
      padding: 5px 0;
      display: inline-block;
    }

    .dbyu_main_header nav ul li a:hover,
    .dbyu_main_header nav ul li a:focus-visible {
      color: #555;
      outline: none;
      text-decoration: underline;
    }

    /* 드롭다운 */
    .dbyu_main_header nav ul li ul {
      position: absolute;
      top: 100%;
      left: 0;
      background: #fff;
      border: 1px solid #ddd;
      display: none;
      flex-direction: column;
      min-width: 180px;
      z-index: 1000;
    }

    .dbyu_main_header nav ul li ul li {
      width: 100%;
    }

    .dbyu_main_header nav ul li ul li a {
      padding: 10px;
      display: block;
      font-weight: 400;
    }

    .dbyu_main_header nav ul li ul li a:hover,
    .dbyu_main_header nav ul li ul li a:focus-visible {
      background: #f5f5f5;
      text-decoration: none;
    }

    .dbyu_main_header nav ul li:focus-within > ul,
    .dbyu_main_header nav ul li:hover > ul {
      display: flex;
    }

    /* 햄버거 버튼 */
    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }

    .menu-toggle span {
      display: block;
      width: 25px;
      height: 3px;
      background: #000;
    }

    /* 반응형 */
    @media (max-width: 900px) {
      nav {
        position: absolute;
        top: 60px;
        left: 0;
        width: 100%;
        background: #fff;
        border-top: 1px solid #ddd;
        display: none;
        flex-direction: column;
      }

      .dbyu_main_header nav ul {
        flex-direction: column;
        gap: 15px;
        padding: 20px;
      }

      .dbyu_main_header nav ul li ul {
        position: static;
        border: none;
        display: none;
      }

      .dbyu_main_header nav ul li.open > ul {
        display: flex;
      }

      .menu-toggle {
        display: flex;
      }

      nav.active {
        display: flex;
      }
    }