body {
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f4f4f4;
    color: #333;
}

main {
    padding: 20px;
}

.info_bar,
.tabs-navigation {
    background-color: #333;
    color: #eee;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    border-radius: 8px;
    position: sticky;
    z-index: 1000;
}

.info_bar {
    top: 16px;
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
}

.tabs-navigation {
    justify-content: flex-start;
    gap: 15px;
    margin-bottom: 20px;
    border-top-left-radius: 0;
    border-top-right-radius: 0;
}

.tabs-navigation button {
    background: none;
    border: none;
    color: #eee;
    padding: 8px 15px;
    cursor: pointer;
    font-size: 1em;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

.tabs-navigation button:hover {
    background-color: #555;
}

.tabs-navigation button.active {
    background-color: #007bff;
    font-weight: bold;
}

.status_container {
    display: flex;
    align-items: center;
    gap: 10px;
}

#status-display {
    padding: 5px 10px;
    border-radius: 4px;
    font-weight: bold;
}

#status-display.online {
    background-color: #4CAF50;
    color: white;
}

#status-display.offline {
    background-color: #f44336;
    color: white;
}

#status-display.unknown {
    background-color: #ff9800;
    color: white;
}

.clock {
    font-size: 1.1em;
    font-weight: bold;
}

.refresh-button {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #eee;
    transition: color 0.3s ease;
}

.refresh-button:hover {
    color: #007bff;
}

.refresh-button svg {
    width: 24px;
    height: 24px;
    fill: currentColor;
}

#logout-button {
    background-color: #f44336;
    color: white;
    padding: 8px 15px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1em;
    transition: background-color 0.3s ease;
}

#logout-button:hover {
    background-color: #d32f2f;
}

.tab {
    background-color: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    display: none;
}

.tab.shown {
    display: block;
}

.tab-title {
    color: #007bff;
    margin-top: 0;
    margin-bottom: 15px;
}

.source-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 20px;
}

.source-card {
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 15px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.source-card:hover {
    border-color: #007bff;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.source-card.selected {
    background-color: #e6f2ff;
    border-color: #007bff;
    color: #007bff;
    font-weight: bold;
}

.source-card h4 {
    margin-top: 0;
    margin-bottom: 10px;
    color: #333;
}

.source-card.selected h4 {
    color: #007bff;
}

.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.4);
}

.modal-content {
    background-color: #fefefe;
    margin: 15% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-width: 400px;
    border-radius: 8px;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}

.modal-content h2 {
    color: #333;
    margin-top: 0;
    margin-bottom: 20px;
    text-align: center;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    color: #555;
}

.form-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box;
    font-size: 1em;
    transition: border-color 0.3s ease;
}

.form-group input:focus {
    border-color: #007bff;
    outline: none;
}

#login-form button[type="submit"] {
    background-color: #007bff;
    color: white;
    padding: 10px 15px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1.1em;
    width: 100%;
    transition: background-color 0.3s ease;
}

#login-form button[type="submit"]:hover {
    background-color: #0056b3;
}

.error-message {
    color: #f44336;
    margin-top: 10px;
    text-align: center;
    font-weight: bold;
}