:root {
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-primary-light: #818cf8;
    --color-text: #1f2937;
    --color-text-light: #6b7280;
    --color-text-lighter: #9ca3af;
    --color-bg: #ffffff;
    --color-bg-light: #f9fafb;
    --color-bg-section: #f3f4f6;
    --color-border: #e5e7eb;
    --color-accent: #10b981;
    --color-highlight: #fef3c7;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --max-width: 800px;
    --border-radius: 8px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --transition: all 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

.header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    padding: var(--spacing-2xl) 0;
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="40" height="40" patternUnits="userSpaceOnUse"><path d="M 40 0 L 0 0 0 40" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.header-content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.logo {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.02em;
}

.tagline {
    font-size: 1.125rem;
    opacity: 0.9;
    font-weight: 400;
}

.main-content {
    padding: var(--spacing-2xl) 0;
    min-height: calc(100vh - 300px);
}

.intro-section {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--color-border);
}

.intro-section h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.last-updated {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

.last-updated time {
    font-weight: 500;
    color: var(--color-text);
}

.content-section {
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background-color: var(--color-bg);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.content-section:hover {
    box-shadow: var(--shadow-sm);
    border-color: var(--color-primary-light);
}

.content-section h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-primary-light);
}

.content-section p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
    font-size: 1rem;
    line-height: 1.8;
}

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

.content-section ul {
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

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

.content-section li {
    margin-bottom: var(--spacing-sm);
    line-height: 1.8;
}

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

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

.content-section a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.content-section a:hover {
    color: var(--color-primary-dark);
    border-bottom-color: var(--color-primary-dark);
}

.highlight-box {
    background-color: var(--color-highlight);
    border-left: 4px solid var(--color-accent);
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
    border-radius: var(--border-radius);
}

.highlight-box p {
    margin-bottom: 0;
    color: var(--color-text);
    font-weight: 500;
}

.contact-list {
    list-style: none;
    margin-left: 0;
    margin-top: var(--spacing-md);
}

.contact-list li {
    margin-bottom: var(--spacing-sm);
    padding-left: var(--spacing-md);
    position: relative;
}

.contact-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
}

.contact-box {
    background-color: var(--color-bg-light);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-md);
}

.contact-box p {
    margin-bottom: var(--spacing-sm);
}

.contact-box p:last-child {
    margin-bottom: 0;
}

.footer {
    background-color: var(--color-bg-section);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-2xl);
    text-align: center;
}

.footer p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xs);
    font-size: 0.95rem;
}

.footer p:last-child {
    margin-bottom: 0;
}

.footer-note {
    font-size: 0.85rem;
    color: var(--color-text-lighter);
    font-style: italic;
}

@media (max-width: 768px) {
    :root {
        --spacing-xl: 2rem;
        --spacing-2xl: 2.5rem;
    }

    .logo {
        font-size: 2.25rem;
    }

    .tagline {
        font-size: 1rem;
    }

    .intro-section h2 {
        font-size: 2rem;
    }

    .content-section {
        padding: var(--spacing-md);
    }

    .content-section h3 {
        font-size: 1.25rem;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

    .header {
        padding: var(--spacing-xl) 0;
    }

    .main-content {
        padding: var(--spacing-xl) 0;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 1.875rem;
    }

    .intro-section h2 {
        font-size: 1.75rem;
    }

    .content-section h3 {
        font-size: 1.125rem;
    }

    .content-section {
        padding: var(--spacing-sm);
    }

    .content-section ul {
        margin-left: var(--spacing-md);
    }
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-text: #f9fafb;
        --color-text-light: #d1d5db;
        --color-text-lighter: #9ca3af;
        --color-bg: #111827;
        --color-bg-light: #1f2937;
        --color-bg-section: #1f2937;
        --color-border: #374151;
        --color-highlight: #78350f;
    }

    .content-section {
        background-color: #1f2937;
    }

    .content-section:hover {
        border-color: var(--color-primary);
    }
}

@media print {
    .header {
        background: var(--color-primary);
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }

    .content-section {
        page-break-inside: avoid;
        border: 1px solid var(--color-border);
    }

    .footer {
        page-break-inside: avoid;
    }
}