:root {
    --primary-color: #277ab9;
    --primary-dark: #225f93;
    --primary-darker: #1a4f7d;
    --text-color: #333;
    --bg-color: #F2F6FA;
    --white: #fff;
    --shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
    --nav-width: 250px;
    --header-height: 60px;
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px; /* Standard base font size for readability */
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    overflow-x: hidden;
}

header {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 10px 20px;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: var(--header-height);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.logo {
    max-width: 120px;
    height: auto;
}

.language-selector {
    display: flex;
    align-items: center;
}

.language-selector select {
    padding: 5px;
    font-size: 14px;
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.language-selector select:hover {
    background-color: var(--primary-dark);
}

nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: var(--nav-width);
    background-color: var(--primary-color);
    font-size: 1.1em;
    z-index: 999;
    height: calc(100vh - var(--header-height));
    overflow-y: auto;
    padding-top: 10px;
}

nav.active {
    transform: translateX(0);
}

nav a {
    display: block;
    padding: 10px 15px;
    color: var(--white);
    font-weight: bold;
    text-decoration: none;
    transition: var(--transition);
}

nav a:hover {
    background-color: var(--primary-dark);
}

.main-content {
    flex: 1;
    padding: 20px;
    margin-top: var(--header-height); /* Avoid content being hidden behind the header */
}

@media (max-width: 767px) {
    .logo {
        max-width: 100px;
    }

    header {
        flex-direction: column;
        padding: 20px;
        height: auto;
    }

    .hamburger {
        display: block;
        background-color: var(--primary-color);
        color: var(--white);
        padding: 10px;
        font-size: 24px;
        cursor: pointer;
        position: absolute;
        top: 10px;
        right: 15px;
    }

    nav {
        width: 80%;
        transform: translateX(-100%);
        transition: transform 0.5s ease;
    }

    nav.active {
        transform: translateX(0);
    }

    .nav-links {
        display: flex;
        flex-direction: column;
    }

    .nav-links a {
        padding: 10px;
        margin: 0;
    }

    .main-content {
        margin-top: 10px;
        padding: 20px;
    }

    .submenu {
        display: none;
        background-color: #444;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
        z-index: 1000;
    }

    .submenu a {
        padding: 10px;
        color: var(--white);
        text-decoration: none;
        white-space: nowrap;
    }

    .submenu a:hover {
        background-color: #b84040;
    }
}

.tab-button {
    padding: 15px;
    background-color: var(--primary-color);
    color: var(--white);
    border-radius: 5px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.tab-button:hover, .tab-button.active {
    background-color: var(--primary-dark);
    color: var(--white);
}

footer {
    background-color: var(--primary-color);
    color: var(--white);
    text-align: center;
    padding: 15px;
}

.social-links a {
    text-decoration: none;
    color: var(--white);
    margin-right: 15px;
}

.table-container {
    width: 100%;
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

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

th {
    background-color: var(--primary-dark);
    color: var(--white);
}
