/* Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, Helvetica, sans-serif;
}

body {
  background: #d8e7f7;
}

/* Sidebar */
.sidebar {
  width: 220px;
  height: 100vh;
  background: #1e293b;
  color: white;
  position: fixed;
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.sidebar-logo {
  text-align: center;
  margin-bottom: 15px;
}

.sidebar-logo .logo {
  width: 100px;
  height: auto;
  border-radius: 8px;
}

.sidebar h2 {
  text-align: center;
  margin-bottom: 25px;
  font-size: 18px;
}

.sidebar a {
  display: block;
  color: white;
  text-decoration: none;
  padding: 10px;
  margin-bottom: 10px;
  border-radius: 6px;
  width: 100%;
  text-align: center;
}

.sidebar a:hover {
  background: #334155;
}

/* Main content */
.main {
  margin-left: 220px;
  padding: 20px;
}

/* Calendar */
.calendar {
  background: #fefefe;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

.calendar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.calendar-header h3 {
  margin: 0;
}

.calendar-header button {
  padding: 5px 10px;
  border: none;
  background: #2563eb;
  color: white;
  border-radius: 6px;
  cursor: pointer;
}

.calendar-header button:hover {
  background: #1d4ed8;
}

.weekdays, .days {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  text-align: center;
}

.weekdays div {
  font-weight: bold;
  margin-bottom: 5px;
}

.days div {
  padding: 10px;
  margin-bottom: 5px;
  border-radius: 6px;
  cursor: pointer;
}

.days div:hover {
  background: #2563eb;
  color: white;
}