body {
    font-family: "Apple SD Gothic Neo", sans-serif;
    margin: 0;
    padding-top: 90px; /* ✅ fixed header 공간 확보 */
    background: #f6f6f6;
  }

  /* ===== HEADER ===== */
  header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 70px;
    background: #ffffff;
    border-bottom: 1px solid #ddd;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    z-index: 1000;
  }

  .logo {
    font-size: 20px;
    font-weight: 700;
    padding : 20px
  }

  .logo a {
    text-decoration: none;
    color: #333;
  }

  nav {
    display: flex;
    gap: 20px;
    padding: 40px;
  }

  nav a {
    text-decoration: none;
    color: #333;
    font-size: 15px;
    padding-bottom: 4px;
    border-bottom: 2px solid transparent;
    transition: 0.2s;
  }

  nav a:hover,
  nav a.active {
    border-bottom: 2px solid #333;
  }

  /* ===== CONTENT ===== */

  h2 {
    text-align: center;
    margin-bottom: 5px;
  }

  h3 {
    text-align: center;
    font-weight: normal;
    color: #666;
    margin-bottom: 30px;
  }

    h4 {
    text-align: left;
    font-weight: normal;
    font-weight: 700;
    color: #000000;
  }

  .btn-group {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 25px;
  }

  button {
    padding: 10px 20px;
    border: none;
    background: #333;
    color: white;
    border-radius: 6px;
    cursor: pointer;
    font-size: 15px;
    transition: 0.2s;
  }

  button:hover {
    background: #555;
  }

  ul {
    max-width: 500px;
    margin: 0 auto;
    padding: 0;
    list-style: none;
  }

  li {
    background: white;
    padding: 14px 18px;
    margin-bottom: 8px;
    border-radius: 6px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.07);
    cursor: pointer;
    transition: 0.15s;
  }

  li:hover {
    background: #efefef;
  }

  .author-buttons {
  display: flex;
  gap: 12px;
  margin: 20px 0;
  flex-wrap: wrap;
  justify-content: center;
}

.author-btn {
  padding: 10px 18px;
  border: 1px solid #ccc;
  border-radius: 999px;
  background-color: white;
  color: #333;
  font-size: 15px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.author-btn:hover {
  background-color: #f2f2f2;
}

.author-btn.active {
  background-color: #222;
  color: white;
  border-color: #222;
}