body {
  background: #f4f6f9;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  margin: 0;
}
.login-page {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: #1f2d3d;
}
.login-logo {
  max-width: 200px;
  margin-bottom: 20px;
}
.login-box {
  background: #fff;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  width: 350px;
  text-align: center;
}
.topbar {
  background-color: #1f2d3d;
  color: white;
  padding: 10px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.navbar {
  background-color: #2c3e50;
  padding: 1px 2px;
}
.navbar a {
  color: white;
  margin-right: 20px;
  text-decoration: none;
}
.navbar a:hover {
  text-decoration: underline;
}
.cell-selected {
  background-color: #ffd !important;
  font-weight: bold;
  border: 2px solid #ffa500;
}
/* 卡片區塊 
.container {
  background: #fff;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}*/