* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "微軟正黑體", Arial, sans-serif;
  background: #f4f7f6;
  background:url(../images/bg1.jpg) repeat;
}

/* Sidebar */
#part_left {
  float: left;
  width: 260px;
  height: 100vh;
  background: #eaf6f1;
  border-right: 1px solid #cde6db;
}

/* Logo */
#logo {
  /*height: 90px;
  background: #dff3ea;
  border-bottom: 1px solid #cde6db;*/
  
  height: 90px;
  background: url("../images/logo.png") center center no-repeat;
  background-size: contain;
  border-bottom: 1px solid #cde6db;

}

/* Main */
#main {
  padding: 4px 0;
}

#main ul {
  list-style: none;
}

/* 一級 */
#main > ul > li > span {
  display: block;
  padding: 12px 16px;
  background: #bfe6d3;
  color: #1f3a5f;
  font-weight: bold;
  cursor: pointer;
  position: relative;
  border-bottom: 1px solid #a8d7c4;
}

/* 二級 */
#main li > ul > li > span,
#main li > ul > li > a {
  display: block;
  padding: 10px 20px;
  background: #e9fbf3;
  color: #244766;
  text-decoration: none;
  border-bottom: 1px solid #d4efe3;
}

/* 三級 */
#main li li li > span,
#main li li li > a {
  display: block;
  padding: 8px 32px;
  background: #f6fffb;
  color: #3a5f7f;
  border-bottom: 1px solid #e3f5ee;
  font-size: 15px;
}

/* hover */
#main li > span:hover,
#main li > a:hover {
  background: #c9f0dd;
  color: #0b3c5d;
}

/* 子選單 */
#main li > ul {
  display: none;
}

#main li.open > ul {
  display: block;
}

/* =========================
   Unicode 箭頭系統（穩定版）
   ========================= */

/* 必須 */
#main li.has-child > span {
  position: relative;
}

/* =========================
   第一層（大箭頭 ▶ / ▼）
   ========================= */
#main > ul > li.has-child > span::after {
  content: "▸";
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 24px;   /* 大 */
}

#main > ul > li.open.has-child > span::after {
  content: "▾";
}

/* =========================
   第二層（小箭頭 ▸ / ▾）
   ========================= */
#main > ul > li > ul > li.has-child > span::after {
  content: "▹";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;   /* 小 */
}

#main > ul > li > ul > li.open.has-child > span::after {
  content: "▿";
}

/* =========================
   第三層（無箭頭）
   ========================= */
#main > ul > li > ul > li > ul > li > span::after {
  content: "";
}

/* link */
#main a {
  text-decoration: none;
  color: inherit;
}

/* animation */
#main li > ul {
  animation: fadeIn 0.15s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-2px); }
  to { opacity: 1; transform: translateY(0); }
}