body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 20px;
    color: #333;
}
h1, h2, h3 {
    color: #2c3e50;
}
h1 {
    border-bottom: 2px solid #3498db;
    padding-bottom: 10px;
}
h2 {
    background-color: #f8f9fa;
    padding: 8px;
    border-left: 4px solid #3498db;
}
pre {
    background-color: #f8f9fa;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
}
code {
    font-family: Consolas, Monaco, 'Andale Mono', monospace;
    color: #c7254e;
    background-color: #f9f2f4;
    padding: 2px 4px;
    border-radius: 3px;
}
.note {
    background-color: #e7f5fe;
    border-left: 4px solid #3498db;
    padding: 12px;
    margin: 15px 0;
}
.warning {
    background-color: #fff3cd;
    border-left: 4px solid #ffc107;
    padding: 12px;
    margin: 15px 0;
}

a {
  text-decoration: none; /* 移除底線 */
  color: #2C3E50;
}

a:visited {
  color: inherit; /* 使用繼承的顏色，防止變色 */
}

a:hover {
  text-decoration: underline; /* 游標移上時顯示底線 */
  color: #3182CE;
}

/* 基本導航列樣式 */
.nav {
  background-color: #3182CE;
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
}

.nav li {
  position: relative;
}

.nav a {
  text-decoration: none;
  padding: 10px 20px;
  display: block;
  /*color: #333;*/
  color: white;
}

/* 子菜單隱藏 */
.submenu {
  list-style: none;
  position: absolute;
  top: 100%;
  left: 0;
  margin: 0;
  padding: 0;
  display: none;
  background-color: #BEE3F8;
  border: 1px solid #ccc;
}

/* 子菜單的樣式 */
.submenu li a {
  padding: 10px;
  color: black;
}

/* 滑鼠懸停時顯示子菜單 */
.dropdown:hover .submenu {
  display: block;
}