body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #f4f7f9;
    color: #333;
}

h1, h2 {
    color: #2c3e50;
}

/* Layout for all containers */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Messages styling */
.messages {
    list-style: none;
    padding: 0;
    margin: 0;
}

.messages li {
    padding: 10px;
    border-radius: 5px;
    margin-bottom: 10px;
    font-weight: bold;
}

.messages .success {
    background-color: #d4edda;
    color: #155724;
}

.messages .error {
    background-color: #f8d7da;
    color: #721c24;
}

/* Forms, inputs and buttons */
form p {
    margin: 0 0 10px 0;
}

input[type="date"],
input[type="email"],
input[type="text"],
input[type="password"] {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    box-sizing: border-box;
}

button, .button {
    padding: 10px 15px;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    text-decoration: none;
}

button:hover, .button:hover {
    background-color: #2980b9;
}

.approve { background-color: #28a745; }
.reject { background-color: #dc3545; }

/* Calendar and table styling */
#calendar {
    margin-bottom: 20px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}

th, td {
    padding: 12px;
    border: 1px solid #ddd;
    text-align: left;
}

th {
    background-color: #ecf0f1;
}

tr:nth-child(even) {
    background-color: #f9f9f9;
}

/* Responsive adjustments */
@media (max-width: 600px) {
    body {
        padding: 10px;
    }

    .container {
        padding: 15px;
    }

    button, .button {
        width: 100%;
    }

    table, thead, tbody, th, td, tr {
        display: block;
    }

    thead tr {
        position: absolute;
        top: -9999px;
        left: -9999px;
    }

    tr {
        border: 1px solid #ccc;
        margin-bottom: 10px;
        border-radius: 8px;
    }

    td {
        border: none;
        position: relative;
        padding-left: 50%;
        text-align: right;
    }

    td:before {
        position: absolute;
        top: 6px;
        left: 6px;
        width: 45%;
        padding-right: 10px;
        white-space: nowrap;
        text-align: left;
        font-weight: bold;
    }

    td:nth-of-type(1):before { content: "Start Date"; }
    td:nth-of-type(2):before { content: "End Date"; }
    td:nth-of-type(3):before { content: "Status"; }
    td:nth-of-type(4):before { content: "Actions"; }
}