:root {
    --primary-color: #2e7d32;
    --secondary-color: #4caf50;
    --background-color: #f1f8e9;
    --text-color: #333;
    --card-bg: #fff;
    --border-radius: 8px;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

header {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem;
    box-shadow: var(--shadow);
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    gap: 1rem;
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}

main {
    padding: 1rem;
    max-width: 1200px;
    margin: 0 auto;
}

.card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 1rem;
}

h1, h2, h3 {
    color: var(--primary-color);
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
    background: var(--card-bg);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

th, td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid #eee;
}

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

tr:last-child td {
    border-bottom: none;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    nav ul {
        flex-direction: column;
        gap: 0.5rem;
    }

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

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

    tr {
        margin-bottom: 1rem;
        border: 1px solid #ddd;
        border-radius: var(--border-radius);
        background: var(--card-bg);
    }

    td {
        border: none;
        border-bottom: 1px solid #eee;
        position: relative;
        padding-left: 50%;
    }

    td:before {
        position: absolute;
        top: 0.75rem;
        left: 0.75rem;
        width: 45%;
        padding-right: 10px;
        white-space: nowrap;
        font-weight: bold;
        content: attr(data-label);
    }
}