* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, "Noto Sans TC", "PingFang TC", sans-serif;
  background: #f6f6fb;
  color: #1b1d2e;
}
header, main { max-width: 480px; margin: 0 auto; padding: 16px; }
header h1 { margin: 8px 0 0; color: #5b4ef0; }
header p { margin: 4px 0 0; color: #6b7088; }

#add-form { display: flex; gap: 8px; flex-wrap: wrap; }
#add-form input { flex: 1 1 140px; padding: 12px; font-size: 16px; border: 1px solid #d8dbe8; border-radius: 10px; }
button { font: inherit; border: 0; border-radius: 10px; padding: 12px 16px; cursor: pointer; }
#add-form button { background: #5b4ef0; color: #fff; }

.habit {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 12px;
  align-items: center;
  margin-top: 12px;
  padding: 16px;
  background: #fff;
  border-radius: 16px;
}
.habit h2 { margin: 0; font-size: 18px; }
.meta { margin: 4px 0 0; color: #6b7088; font-size: 14px; }
.check { background: #eeecff; color: #5b4ef0; font-weight: 700; min-width: 96px; }
.is-done .check { background: #0ea5a4; color: #fff; }

.week { display: flex; gap: 6px; list-style: none; margin: 0; padding: 0; }
.week li {
  width: 28px; height: 28px; border-radius: 50%;
  display: grid; place-items: center;
  font-size: 13px; background: #f0f1f6; color: #6b7088;
}
.week li.on { background: #0ea5a4; color: #fff; }
.delete { background: none; color: #6b7088; font-size: 14px; padding: 4px 8px; justify-self: end; }
.empty { color: #6b7088; text-align: center; margin-top: 32px; }