.header-container {
    background-color: #333;
    color: white;
    padding: 15px 30px;
  }

  .header-inner {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
  }

  .left-controls {
    display: flex;
    align-items: center;
    gap: 20px;
  }

  .dropdown-container {
    position: relative;
  }

  .menu-toggle {
    cursor: pointer;
    font-size: 1.5em;
    padding: 8px 10px;
    background-color: #4caf50;
    border-radius: 6px;
    border: 1px solid #3d8b40;
    color: white;
    transition: background-color 0.2s, color 0.2s;
  }

  .menu-toggle:hover {
    background-color: #ff9800;
    border-color: #e07b00;
  }

  .dropdown-menu {
    display: none;
    position: absolute;
    top: 100%; /* Çܹö°Å ¹öÆ° ¹Ù·Î ¾Æ·¡ */
    left: 0;
    background-color: #444;
    padding: 10px 0;
    border-radius: 4px;
    flex-direction: column;
    z-index: 1000;
    min-width: 200px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  }

  .dropdown-menu a {
    padding: 10px 20px;
    color: white;
    text-decoration: none;
    display: flex;
    align-items: center;
    font-weight: bold;
    font-size: 0.95em;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  }

  .dropdown-menu a i {
    margin-right: 8px;
    flex-shrink: 0;
  }

  .dropdown-menu a:hover {
    background-color: #555;
  }

  .dropdown-container.active .dropdown-menu {
    display: flex;
  }

  .header-title a {
    color: white;
    font-size: 1.5em;
    font-weight: bold;
    text-decoration: none;
    white-space: nowrap;
  }

  .header-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 12px;
  }

  .header-nav a {
    color: white;
    padding: 4px 8px;
    font-size: 0.85em;
    font-weight: bold;
    text-decoration: none;
    background-color: transparent;
    border-radius: 4px;
    white-space: nowrap;
  }

  .header-nav a i {
    margin-right: 6px;
  }

  .header-nav a:hover {
    text-decoration: underline;
  }

.highlight-mail {
  font-weight: bold;
  padding: 6px 10px;
  background: linear-gradient(to right, #ffca28, #ffa000); /* ´õ ÁøÇÑ ÁÖȲÅæ */
  color: #333; /* ǪÅÍ ¹è°æ»ö ¶Ç´Â ¾îµÎ¿î ȸ»ö */
  box-shadow: 2px 2px 5px rgba(0, 0, 0, 0.3);
  border: none;
  border-radius: 0; /* ¹Ý¿ø Á¦°Å */
}


.highlight-mail:hover {
  background: linear-gradient(to right, #ffc107, #ff8f00);
  box-shadow: 3px 3px 6px rgba(0, 0, 0, 0.4);
}
  hr {
    margin: 0;
    border: none;
    height: 2px;
    background-color: #444;
  }

  body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f9f9f9;
  }

  .container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
  }

  footer {
    text-align: center;
    margin: 40px 0 20px;
    font-size: 12px;
    color: #888;
  }

@media (max-width: 600px) {
  .header-container {
    padding: 15px;
  }

  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .header-nav {
    width: 100%;
    flex-direction: row; /* ? ÇÑ ÁÙ ¹èÄ¡ */
    gap: 8px;
    margin-top: 10px;
    justify-content: space-between; /* Á¿ì Á¤·Ä */
    flex-wrap: nowrap;
  }

  .header-nav a {
    width: 48%; /* ? ¹öÆ° µÎ °³°¡ ÇÑ ÁÙ¿¡ ³ª¶õÈ÷ */
    text-align: center;
    font-size: 0.85em;
    padding: 6px 10px;
    white-space: nowrap;
  }

  .highlight-mail {
    background: linear-gradient(to right, #ffca28, #ffa000);
    color: #333;
    box-shadow: 2px 2px 5px rgba(0, 0, 0, 0.3);
    border-radius: 0;
    max-width: 48%;
    font-size: 0.85em;
    padding: 6px 10px;
    text-align: center;
  }

  .dropdown-menu {
    position: static;
    margin-top: 10px;
    width: 100%;
    box-shadow: none;
  }

  .dropdown-menu a {
    width: 100%;
    text-align: left;
  }
}

.countdown-box {
  margin-top: 40px;
  font-size: 1em;
  line-height: 1.6;
}

.countdown-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: nowrap;
  padding: 6px 0;
  border-bottom: 1px solid #e0e0e0;
}

.countdown-label {
  font-weight: bold;
  color: #333;
  font-size: 0.95em;
  flex: 1;
}

.countdown-value {
  font-family: monospace;
  font-weight: bold;
  color: #d84315;  /* ¿¹: ÁÖȲ °è¿­ °­Á¶ */
  margin-left: 10px;
  white-space: nowrap;
}

@media (max-width: 600px) {
  .countdown-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .countdown-value {
    margin-left: 0;
    margin-top: 4px;
  }
}