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

:root {
    --primary: #1F7A5A;
    --primary-dark: #165A43;
    --secondary: #2B2B2B;
    --text-dark: #2C3E50;
    --text-light: #6C757D;
    --white: #FFFFFF;
    --light-bg: #F8F9FA;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
}

header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: 3rem 2rem;
    text-align: center;
    box-shadow: 0 4px 12px rgba(31, 122, 90, 0.15);
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

header p {
    font-size: 1.1em;
    opacity: 0.95;
}

nav {
    background-color: var(--white);
    padding: 1.2rem 2rem;
    border-bottom: 1px solid #DEE2E6;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

nav a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    margin-right: 2rem;
    transition: color 0.3s ease;
    font-size: 0.95rem;
}

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

.container {
    max-width: 900px;
    margin: 2rem auto;
    background: var(--white);
    padding: 3rem 2rem;
    border-radius: 12px;
}

h2 {
    color: var(--primary);
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    font-size: 1.5em;
    border-bottom: 2px solid var(--primary);
    padding-bottom: 0.75rem;
    font-weight: 700;
}

h3 {
    color: var(--secondary);
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    font-size: 1.1em;
    font-weight: 600;
}

p {
    margin-bottom: 1rem;
    line-height: 1.8;
    color: var(--text-dark);
}

ul, ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

li {
    margin-bottom: 0.6rem;
    color: var(--text-dark);
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

.last-updated {
    color: var(--text-light);
    font-style: italic;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid #DEE2E6;
}

footer {
    background-color: var(--secondary);
    color: var(--white);
    text-align: center;
    padding: 2rem;
    margin-top: 3rem;
}

footer a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

footer a:hover {
    color: #4CAF7F;
    text-decoration: underline;
}

@media (max-width: 768px) {
    .container {
        margin: 1rem;
        padding: 1.5rem;
    }

    header {
        padding: 2rem 1.5rem;
    }

    header h1 {
        font-size: 1.8em;
    }

    nav {
        padding: 1rem 1.5rem;
    }

    nav a {
        display: block;
        margin: 0.75rem 0;
        margin-right: 0;
    }

    h2 {
        margin-top: 1.5rem;
        font-size: 1.3em;
    }

    h3 {
        font-size: 1rem;
    }
}