body {
  font-family: "Noto Sans TC", sans-serif;
  background: #f9f9f9;
  margin: 0;
  padding: 1em;
  line-height: 1.6;
}

h1, h2 {
  text-align: center;
  color: #333;
}

#user-login {
  text-align: center;
  margin-bottom: 1em;
}

#username {
  padding: 6px;
  font-size: 16px;
}

button {
  padding: 6px 12px;
  margin: 5px;
  font-size: 14px;
  cursor: pointer;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: white;
}

th, td {
  border: 1px solid #ccc;
  padding: 0.5em;
  text-align: left;
  vertical-align: top;
  height: 100px;
  position: relative;
}

th {
  background: #f0f0f0;
}

.date-label {
  font-weight: bold;
  margin-bottom: 5px;
  display: block;
}

.entry {
  background: #e0f7fa;
  border-left: 4px solid #00796b;
  margin: 4px 0;
  padding: 4px;
  font-size: 13px;
  position: relative;
}

.entry button {
  position: absolute;
  right: 4px;
  top: 4px;
  font-size: 12px;
  padding: 2px 6px;
  background: #ff5252;
  color: white;
  border: none;
  border-radius: 3px;
}

.popup {
  background: white;
  border: 1px solid #aaa;
  padding: 1em;
  position: fixed;
  top: 20%;
  left: 50%;
  transform: translateX(-50%);
  box-shadow: 2px 2px 10px rgba(0,0,0,0.1);
  z-index: 1000;
}

.hidden {
  display: none;
}

#calendar-log {
  background: #fefefe;
  padding: 1em;
  max-height: 300px;
  overflow-y: auto;
  border: 1px solid #ccc;
}