:root {
    --primary-color: #3c6e71;
    --secondary-color: #284b63;
    --text-color-dark: #353535;
    --text-color-light: #fff;
    --primary-bg: #f5f5f5;
    --secondary-bg: #ffffff;
    
    --hover-color: #d0d0d0;
    --border-color: #dee2e6;
    
    --tbl-row-even-color: #fff;
    --tbl-row-odd-color: #f7f6f6;

    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    
}

html, body {
    height: 100%;
    margin: 0;
}

body {
    display: flex;
    flex-direction: column;
    padding: 15px;
    box-sizing: border-box;
    font-family: var(--font-family) !important;
    background-color: var(--primary-bg);
    color: var(--text-color-dark);
}

#header {
    flex-shrink: 0;
    flex-wrap: wrap; 
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 10px;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    background-color: var(--secondary-bg);
}

#header h1 {
    margin: 0;
}

#header div {
    flex-wrap: wrap; 
    display: flex;
    gap: 15px;
}

#header a {
    font-weight: bold;
    padding: 10px 20px;
    text-decoration: none;
    border: none;
    border-radius: 4px;
    background-color: var(--primary-color);
    color: var(--text-color-light);
    cursor: pointer;
    transition: background-color 0.3s;
}

#header a:hover {
    background-color: var(--secondary-color);
}