body {
  margin: 0;
  font-family: "Segoe UI", "Yu Gothic UI", sans-serif;
  background: linear-gradient(135deg, #eef4ff, #f7fbff);
  color: #243b53;
}

#wrapper {
  max-width: 900px;
  margin: 40px auto;
  padding: 24px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.12);
}

#header {
  margin: 0 0 12px;
  text-align: center;
  font-size: 28px;
  color: #1e3a8a;
}

#buttons {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 18px;
}

button {
  border: none;
  border-radius: 999px;
  padding: 10px 16px;
  background: #2563eb;
  color: white;
  font-size: 16px;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.2s ease;
}

button:hover {
  background: #1d4ed8;
  transform: translateY(-1px);
}

#calendar {
  display: flex;
  justify-content: center;
}

table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  border-radius: 16px;
  box-shadow: 0 8px 18px rgba(15, 23, 42, 0.08);
}

th, td {
  width: 14.28%;
  height: 64px;
  text-align: center;
  vertical-align: middle;
  font-size: 15px;
  border: 1px solid #dbe4f0;
  background: #ffffff;
}

th {
  background: #eff6ff;
  color: #1e3a8a;
  font-weight: 700;
}

td {
  transition: background 0.15s ease;
}

td:hover {
  background: #f8fbff;
}

tr:nth-child(even) td {
  background: #fcfdff;
}

tr:nth-child(odd) td {
  background: #ffffff;
}