body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f0f4f8;
    color: #041f2c;
}
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px;
    background-color: #429bc7;
    color: #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}
.header img {
    height: 50px;
    margin-right: 20px;
}
.header h1 {
    margin: 0;
    font-size: 24px;
}
.header .auth-btn {
    background-color: #0c4e6d;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
}
.header .auth-btn:hover {
    background-color: #0c4e6d;
}
.content {
    display: flex;
    background-color: #f0f4f8;
   
}
.sidebar {
    width: 200px;
    padding: 20px;
   
    color: white;
    height: 100vh;
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.1);
}
.sidebar h2 {
    margin-top: 0;
    font-size: 18px;
}
.sidebar a {
    display: block;
    margin-bottom: 10px;
    color: #b0bec5;
    text-decoration: none;
    transition: color 0.3s;
}
.sidebar a:hover {
    color: #eceff1;
}
.main-content {
    flex: 1;
    padding: 20px;
    background-color: transparent;
}
/* Calendar styles */
.calendar {
    margin-top: 20px;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    
}
.calendar .controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    background-color: #37474f;
    color: white;
}
.calendar .controls button {
    background-color: #546e7a;
    color: white;
    border: none;
    padding: 5px 10px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}
.calendar .controls button:hover {
    background-color: #455a64;
}
.calendar table {
    width: 100%;
    border-collapse: collapse;
}
.calendar th, .calendar td {
    text-align: center;
    padding: 15px;
    border: 1px solid #ddd;
    cursor: pointer;
}
.calendar th {
    background-color: #546e7a;
    color: white;
}
.calendar td.empty {
    background-color: #f0f4f8;
    cursor: default;
}
.calendar td.today {
    background-color: #ffcc80;
}
.calendar td.event {
    background-color: #90caf9;
    position: relative;
}
.calendar td.event:hover:after {
    content: attr(data-event);
    position: absolute;
    bottom: -20px;
    left: 50%;
    transform: translateX(-50%);
    background: #546e7a;
    color: white;
    padding: 5px 10px;
    border-radius: 5px;
    font-size: 12px;
    white-space: nowrap;
}
/* Login Popup styles */
.overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
}
.login-popup {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    padding: 20px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
    z-index: 1001;
    border-radius: 10px;
    width: 300px;
}
.login-popup h2 {
    margin: 0 0 20px;
    font-size: 18px;
    color: #37474f;
}
.login-popup input {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
}
.login-popup button {
    padding: 10px 20px;
    background-color: #546e7a;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}
.login-popup button.close-btn {
    background-color: #ff6f61;
}
.login-popup button:hover {
    opacity: 0.9;
}