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

:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --text-color: #333;
    --text-light: #666;
    --text-lighter: #999;
    --bg-color: #ffffff;
    --bg-light: #f8f9fa;
    --border-color: #e0e0e0;
    --link-color: #667eea;
    --link-hover: #764ba2;
    --max-width: 1200px;
    --spacing: 20px;
}

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

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing);
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 20px 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

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

.logo h1 {
    font-size: 1.8em;
    font-weight: 700;
    margin: 0;
}

.nav {
    display: flex;
    gap: 30px;
}

.nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s;
}

.nav a:hover {
    opacity: 0.8;
}

/* Main Content */
.main-content {
    padding: 40px 0;
    min-height: calc(100vh - 200px);
}

.page-title {
    font-size: 2.5em;
    margin-bottom: 10px;
    color: var(--text-color);
    font-weight: 700;
}

.last-updated {
    color: var(--text-light);
    font-size: 0.95em;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
}

.content {
    background: var(--bg-color);
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.intro {
    font-size: 1.1em;
    margin-bottom: 20px;
    color: var(--text-color);
}

/* Sections */
.section {
    margin-bottom: 40px;
}

.section:last-child {
    margin-bottom: 0;
}

.section h2 {
    font-size: 1.8em;
    margin-top: 40px;
    margin-bottom: 20px;
    color: var(--text-color);
    font-weight: 700;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border-color);
}

.section:first-child h2 {
    margin-top: 0;
}

.section h3 {
    font-size: 1.4em;
    margin-top: 30px;
    margin-bottom: 15px;
    color: var(--text-color);
    font-weight: 600;
}

.section h4 {
    font-size: 1.2em;
    margin-top: 25px;
    margin-bottom: 12px;
    color: var(--text-color);
    font-weight: 600;
}

.section p {
    margin-bottom: 15px;
    color: var(--text-color);
    line-height: 1.8;
}

.section ul {
    margin-left: 20px;
    margin-bottom: 20px;
}

.section li {
    margin-bottom: 12px;
    color: var(--text-color);
    line-height: 1.7;
}

.section li strong {
    color: var(--text-color);
    font-weight: 600;
}

.section a {
    color: var(--link-color);
    text-decoration: none;
    transition: color 0.3s;
}

.section a:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

/* Footer */
.footer {
    background-color: #2c3e50;
    color: white;
    padding: 40px 0 20px;
    margin-top: 60px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 30px;
}

.footer-section h3 {
    font-size: 1.2em;
    margin-bottom: 15px;
    color: white;
}

.footer-section ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-section li {
    margin-bottom: 10px;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9em;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 15px;
    }

    .nav {
        flex-wrap: wrap;
        justify-content: center;
        gap: 15px;
    }

    .page-title {
        font-size: 2em;
    }

    .content {
        padding: 25px;
    }

    .section h2 {
        font-size: 1.5em;
    }

    .section h3 {
        font-size: 1.2em;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .main-content {
        padding: 20px 0;
    }

    .page-title {
        font-size: 1.75em;
    }

    .content {
        padding: 20px;
    }

    .section h2 {
        font-size: 1.3em;
    }

    .section h3 {
        font-size: 1.1em;
    }

    .section h4 {
        font-size: 1.05em;
    }
}

/* Print Styles */
@media print {
    .header,
    .footer {
        display: none;
    }

    .main-content {
        padding: 0;
    }

    .content {
        box-shadow: none;
        padding: 0;
    }
}