* {
  box-sizing: border-box;
}

body {
  font-family: sans-serif;
  background: #f5f5f5;
  color: #333;
  margin: 0;
  padding: 20px;
}

.container {
  /* 最大幅 */
  max-width: 800px;
  width: 100%;
  margin: 0 auto;

  background: #fff;
  padding: 20px;
  border-radius: 6px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

h1 {
  font-size: 1.4em;
  margin-bottom: 16px;
  text-align: center;
}

.tabs {
  display: flex;
  margin-bottom: 16px;
}

.tabs button {
  flex: 1;
  padding: 8px;
  border: none;
  background: #e0e0e0;
  cursor: pointer;
  transition: background 0.2s;
}

.tabs button.active {
  background: #2196f3;
  color: #fff;
}

.mode {
  display: none;
}

.mode.active {
  display: block;
}

label {
  display: block;
  margin-bottom: 12px;
  font-size: 0.95em;
}

input[type="number"] {
  width: 100%;
  padding: 6px;
  margin-top: 4px;
  border: 1px solid #ccc;
  border-radius: 4px;
}

button {
  display: inline-block;
  padding: 8px 12px;
  background: #2196f3;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  background: #1976d2;
}

.result {
  margin-top: 12px;
  font-weight: bold;
}

.Clockbutton{
  background-color: #fff;
  border: solid 2px #2f4f4f;
  color: #2f4f4f;
  padding: 10px 30px;
  text-decoration: none;
  font-size: 1em;
}
.Clockbutton:hover {
  color: #2f4f4f;
  background-color: #b0e0e6;
}