/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: #0066cc;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

a:focus {
    outline: 2px solid #0066cc;
    outline-offset: 2px;
}

/* Layout Container */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.site-header {
    border-bottom: 1px solid #ddd;
    padding: 20px 0;
    background-color: #fff;
}

.site-branding {
    margin-bottom: 15px;
}

.site-title {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 5px;
}

.site-title a {
    color: #333;
}

.site-title a:hover {
    text-decoration: none;
    color: #0066cc;
}

.site-tagline {
    font-size: 0.95rem;
    color: #666;
}

/* Navigation */
.main-navigation ul {
    list-style: none;
    display: flex;
    gap: 25px;
    flex-wrap: wrap;
}

.main-navigation a {
    color: #333;
    font-size: 0.95rem;
}

.main-navigation a:hover {
    color: #0066cc;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: 1px solid #333;
    padding: 8px 15px;
    cursor: pointer;
    font-size: 0.9rem;
    color: #333;
}

.mobile-menu-toggle:focus {
    outline: 2px solid #0066cc;
    outline-offset: 2px;
}

/* Main Content Area */
.site-main {
    padding: 40px 0;
}

.content-area {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
}

.has-sidebar .content-area {
    grid-template-columns: 70% 30%;
}

/* Primary Content */
.primary-content {
    min-width: 0;
}

/* Sidebar */
.sidebar {
    font-size: 0.9rem;
}

.sidebar-section {
    margin-bottom: 35px;
}

.sidebar-section h3 {
    font-size: 1.1rem;
    margin-bottom: 12px;
    color: #333;
    font-weight: 600;
}

.sidebar-section ul {
    list-style: none;
}

.sidebar-section li {
    margin-bottom: 8px;
}

.sidebar-section a {
    color: #0066cc;
}

/* Article List */
.article-list {
    list-style: none;
}

.article-item {
    margin-bottom: 35px;
    padding-bottom: 35px;
    border-bottom: 1px solid #eee;
}

.article-item:last-child {
    border-bottom: none;
}

.article-title {
    font-size: 1.5rem;
    margin-bottom: 8px;
    font-weight: 600;
}

.article-title a {
    color: #333;
}

.article-title a:hover {
    color: #0066cc;
}

.article-meta {
    font-size: 0.85rem;
    color: #666;
    margin-bottom: 12px;
}

.article-excerpt {
    color: #555;
    line-height: 1.65;
    margin-bottom: 10px;
}

.read-more {
    color: #0066cc;
    font-size: 0.9rem;
}

/* Single Article */
.article-header {
    margin-bottom: 25px;
}

.article-header h1 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 10px;
    line-height: 1.3;
}

.breadcrumb {
    font-size: 0.85rem;
    color: #666;
    margin-bottom: 15px;
}

.breadcrumb a {
    color: #0066cc;
}

.article-content {
    line-height: 1.7;
    color: #333;
}

.article-content h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-top: 35px;
    margin-bottom: 15px;
    color: #333;
}

.article-content h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-top: 25px;
    margin-bottom: 12px;
    color: #333;
}

.article-content p {
    margin-bottom: 18px;
}

.article-content ul,
.article-content ol {
    margin-bottom: 18px;
    padding-left: 30px;
}

.article-content li {
    margin-bottom: 8px;
}

.article-content img {
    margin: 25px 0;
}

.article-content figcaption {
    font-size: 0.85rem;
    color: #666;
    margin-top: 8px;
    font-style: italic;
}

/* Related Articles */
.related-articles {
    margin-top: 50px;
    padding-top: 30px;
    border-top: 1px solid #ddd;
}

.related-articles h2 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    font-weight: 600;
}

.related-articles ul {
    list-style: none;
}

.related-articles li {
    margin-bottom: 10px;
}

/* Article Footer */
.article-footer {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid #eee;
    font-size: 0.85rem;
    color: #666;
}

/* Guide Categories */
.guide-categories {
    margin-bottom: 40px;
}

.guide-category {
    margin-bottom: 40px;
}

.guide-category h2 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: #333;
}

.guide-category ul {
    list-style: none;
}

.guide-category li {
    margin-bottom: 10px;
}

/* Footer */
.site-footer {
    border-top: 1px solid #ddd;
    padding: 30px 0;
    margin-top: 60px;
    font-size: 0.85rem;
}

.footer-nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    margin-bottom: 15px;
}

.footer-nav a {
    color: #666;
}

.footer-nav a:hover {
    color: #0066cc;
}

.copyright {
    color: #666;
}

/* Contact Page */
.contact-info {
    line-height: 1.8;
}

.contact-email {
    font-size: 1.1rem;
    margin: 20px 0;
}

/* Page Content */
.page-content {
    line-height: 1.7;
    max-width: 720px;
}

.page-content h2 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-top: 30px;
    margin-bottom: 15px;
}

.page-content h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-top: 25px;
    margin-bottom: 12px;
}

.page-content p {
    margin-bottom: 15px;
}

.page-content ul,
.page-content ol {
    margin-bottom: 15px;
    padding-left: 30px;
}

.page-content li {
    margin-bottom: 8px;
}

/* 404 Page */
.error-404 {
    text-align: center;
    padding: 60px 20px;
}

.error-404 h1 {
    font-size: 3rem;
    margin-bottom: 15px;
}

.error-404 p {
    font-size: 1.1rem;
    margin-bottom: 25px;
    color: #666;
}

/* Responsive */
@media (max-width: 768px) {
    .site-title {
        font-size: 1.5rem;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .main-navigation ul {
        display: none;
        flex-direction: column;
        gap: 0;
        margin-top: 15px;
    }

    .main-navigation ul.is-open {
        display: flex;
    }

    .main-navigation li {
        border-bottom: 1px solid #eee;
    }

    .main-navigation a {
        display: block;
        padding: 12px 0;
    }

    .has-sidebar .content-area {
        grid-template-columns: 1fr;
    }

    .sidebar {
        margin-top: 40px;
    }

    .article-header h1 {
        font-size: 1.6rem;
    }

    .article-content h2 {
        font-size: 1.3rem;
    }

    .article-content h3 {
        font-size: 1.1rem;
    }

    .footer-nav ul {
        flex-direction: column;
        gap: 10px;
    }
}