/* MSCloud Theme - Clean, Modern, Responsive */

/* ============================================
   CSS Custom Properties (Variables)
   ============================================ */
:root {
    /* Colors - Dark Mode (GitHub-style) */
    --color-primary: #58a6ff;
    --color-primary-dark: #1f6feb;
    --color-primary-light: #79c0ff;
    --color-accent: #3fb950;
    --color-text: #e6edf3;
    --color-text-light: #c9d1d9;
    --color-text-muted: #8b949e;
    --color-bg: #0d1117;
    --color-bg-alt: #161b22;
    --color-bg-code: #1f2428;
    --color-border: #30363d;
    --color-border-dark: #484f58;
    
    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-mono: 'Cascadia Code', 'Fira Code', Consolas, 'Liberation Mono', Menlo, monospace;
    --font-size-base: 16px;
    --line-height: 1.6;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Layout */
    --max-width: 1200px;
    --content-width: 740px;
    --sidebar-width: 280px;
    
    /* Shadows - Darker for dark mode */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.5);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

/* ============================================
   Reset & Base Styles
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: var(--line-height);
    color: var(--color-text);
    background-color: var(--color-bg);
}

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

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* Screen reader only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border: 0;
}

/* ============================================
   Header
   ============================================ */
.site-header {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--space-md) var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.logo a {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-decoration: none;
    color: var(--color-text);
}

.logo-icon {
    font-size: 1.5rem;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 600;
}

.main-nav {
    display: flex;
    gap: var(--space-lg);
}

.main-nav a {
    color: var(--color-text-light);
    font-weight: 500;
    padding: var(--space-xs) 0;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-fast);
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--color-primary);
    text-decoration: none;
    border-bottom-color: var(--color-primary);
}

.tagline {
    margin-left: auto;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

/* ============================================
   Main Layout
   ============================================ */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--space-xl) var(--space-lg);
    display: grid;
    grid-template-columns: 1fr var(--sidebar-width);
    gap: var(--space-2xl);
}

.content {
    min-width: 0; /* Prevent overflow */
}

/* ============================================
   Article Styles
   ============================================ */
.article-full {
    background: var(--color-bg);
}

.article-header {
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
}

.article-title {
    font-size: 2.25rem;
    font-weight: 700;
    line-height: 1.2;
    margin: 0 0 var(--space-md);
    color: var(--color-text);
}

.article-meta {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-text-muted);
    font-size: 0.875rem;
    margin-bottom: var(--space-md);
}

.meta-separator {
    color: var(--color-border-dark);
}

.article-summary {
    font-size: 1.125rem;
    color: var(--color-text-light);
    margin: 0;
    line-height: 1.5;
}

.article-content {
    font-size: 1.0625rem;
    line-height: 1.7;
}

.article-content h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: var(--space-2xl) 0 var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--color-border);
}

.article-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: var(--space-xl) 0 var(--space-md);
}

.article-content h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin: var(--space-lg) 0 var(--space-sm);
}

.article-content p {
    margin: 0 0 var(--space-md);
}

.article-content ul,
.article-content ol {
    margin: 0 0 var(--space-md);
    padding-left: var(--space-xl);
}

.article-content li {
    margin-bottom: var(--space-xs);
}

.article-content blockquote {
    margin: var(--space-lg) 0;
    padding: var(--space-md) var(--space-lg);
    border-left: 4px solid var(--color-primary);
    background: var(--color-bg-alt);
    color: var(--color-text-light);
}

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

/* Code blocks */
.article-content pre {
    margin: var(--space-lg) 0;
    padding: var(--space-md);
    background: var(--color-bg-code);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    overflow-x: auto;
    font-size: 0.875rem;
    line-height: 1.5;
}

.article-content pre code {
    font-family: var(--font-mono);
    background: none;
    padding: 0;
    border-radius: 0;
}

.article-content code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background: var(--color-bg-code);
    padding: 0.125em 0.375em;
    border-radius: 3px;
}

/* Tables */
.article-content table {
    width: 100%;
    margin: var(--space-lg) 0;
    border-collapse: collapse;
    font-size: 0.9375rem;
}

.article-content th,
.article-content td {
    padding: var(--space-sm) var(--space-md);
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.article-content th {
    font-weight: 600;
    background: var(--color-bg-alt);
}

.article-content tr:hover {
    background: var(--color-bg-alt);
}

/* Article footer */
.article-footer {
    margin-top: var(--space-2xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.article-share {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.article-share a {
    padding: var(--space-xs) var(--space-sm);
    border-radius: 4px;
    background: var(--color-bg-alt);
    color: var(--color-text-light);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.article-share a:hover {
    background: var(--color-primary);
    color: white;
    text-decoration: none;
}

.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

/* ============================================
   Index / Article List
   ============================================ */
.articles-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.article-card {
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-border);
}

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

.article-card h2 {
    font-size: 1.5rem;
    margin: 0 0 var(--space-sm);
}

.article-card h2 a {
    color: var(--color-text);
}

.article-card h2 a:hover {
    color: var(--color-primary);
    text-decoration: none;
}

.article-card .article-meta {
    margin-bottom: var(--space-sm);
}

.article-card .excerpt {
    color: var(--color-text-light);
    margin: 0;
}

.read-more {
    display: inline-block;
    margin-top: var(--space-sm);
    font-weight: 500;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-top: var(--space-2xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
}

.pagination a,
.pagination span {
    padding: var(--space-sm) var(--space-md);
    border-radius: 4px;
}

.pagination a {
    background: var(--color-bg-alt);
    color: var(--color-text);
}

.pagination a:hover {
    background: var(--color-primary);
    color: white;
    text-decoration: none;
}

.pagination .current {
    background: var(--color-primary);
    color: white;
}

/* ============================================
   Sidebar
   ============================================ */
.sidebar {
    position: sticky;
    top: calc(60px + var(--space-xl));
    height: fit-content;
}

.sidebar-section {
    margin-bottom: var(--space-xl);
    padding: var(--space-lg);
    background: var(--color-bg-alt);
    border-radius: 8px;
}

.sidebar-section h3 {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-text-muted);
    margin: 0 0 var(--space-md);
}

.archive-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.archive-list li {
    margin-bottom: var(--space-xs);
}

.archive-list a {
    color: var(--color-text-light);
    font-size: 0.9375rem;
    display: flex;
    justify-content: space-between;
}

.archive-list a:hover {
    color: var(--color-primary);
}

.archive-list .count {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.view-all {
    display: inline-block;
    margin-top: var(--space-sm);
    font-size: 0.875rem;
    font-weight: 500;
}

/* Tags */
.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.tag {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 0.8125rem;
    color: var(--color-text-light);
}

.tag:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    text-decoration: none;
}

/* Ad slots */
.sidebar-section.ad-slot {
    display: block !important;
    visibility: visible !important;
    background: #1a2332;
    border: 2px solid var(--color-primary);
    border-radius: 8px;
    padding: var(--space-lg);
    min-height: 100px;
}

.ad-placeholder {
    display: block;
}

.ad-content {
    display: block;
}

.ad-content a {
    text-decoration: none;
    color: inherit;
}

.ad-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
}

.promo-box {
    padding: var(--space-lg);
    background: var(--color-bg);
    border: 1px solid var(--color-primary);
    border-radius: 8px;
    color: var(--color-text);
    text-align: center;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.promo-box:hover {
    border-color: var(--color-primary);
    box-shadow: 0 0 20px rgba(88, 166, 255, 0.2);
}

.promo-box img {
    max-width: 140px;
    border-radius: 4px;
    margin-bottom: var(--space-md);
    box-shadow: var(--shadow-md);
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.promo-box strong {
    display: block;
    font-size: 0.9375rem;
    margin-bottom: var(--space-xs);
    color: var(--color-text);
}

.promo-box .author {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
}

.promo-box .cta {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-primary);
    color: var(--color-bg);
    border-radius: 4px;
    font-size: 0.8125rem;
    font-weight: 500;
    transition: background var(--transition-fast);
}

.promo-box:hover .cta {
    background: var(--color-primary-dark);
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
    background: var(--color-bg-alt);
    border-top: 1px solid var(--color-border);
    margin-top: var(--space-2xl);
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--space-2xl) var(--space-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-2xl);
    margin-bottom: var(--space-xl);
}

.footer-section h4 {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin: 0 0 var(--space-md);
    color: var(--color-text);
}

.footer-section p {
    color: var(--color-text-light);
    font-size: 0.9375rem;
    margin: 0;
}

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

.footer-section li {
    margin-bottom: var(--space-xs);
}

.footer-section a {
    color: var(--color-text-light);
    font-size: 0.9375rem;
}

.footer-section a:hover {
    color: var(--color-primary);
}

.footer-bottom {
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-bottom p {
    margin: 0;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .container {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        position: static;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: var(--space-lg);
    }
    
    .sidebar-section {
        margin-bottom: 0;
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-base: 15px;
    }
    
    .header-container {
        flex-wrap: wrap;
    }
    
    .main-nav {
        order: 3;
        width: 100%;
        justify-content: center;
        margin-top: var(--space-sm);
    }
    
    .tagline {
        display: none;
    }
    
    .article-title {
        font-size: 1.75rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    
    .article-footer {
        flex-direction: column;
        gap: var(--space-md);
    }
}

@media (max-width: 480px) {
    .header-container {
        padding: var(--space-sm) var(--space-md);
    }
    
    .container {
        padding: var(--space-md);
    }
    
    .article-meta {
        flex-wrap: wrap;
    }
    
    .sidebar {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Page Headers
   ============================================ */
.page-header {
    margin-bottom: var(--space-2xl);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
}

.page-title {
    font-size: 2rem;
    font-weight: 700;
    margin: 0 0 var(--space-sm);
    color: var(--color-text);
}

.page-title .tag-label {
    color: var(--color-text-muted);
    font-weight: 400;
}

.page-description {
    color: var(--color-text-light);
    font-size: 1.125rem;
    margin: 0;
}

/* ============================================
   Archives Page
   ============================================ */
.archive-groups {
    display: flex;
    flex-direction: column;
    gap: var(--space-2xl);
}

.archive-year h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    margin: 0 0 var(--space-lg);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--color-primary);
}

.archive-month {
    margin-bottom: var(--space-lg);
}

.archive-month h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin: 0 0 var(--space-sm);
}

.archive-groups .archive-list li {
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-border);
}

.archive-groups .archive-list li:last-child {
    border-bottom: none;
}

.archive-title {
    flex: 1;
}

.archive-date {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    white-space: nowrap;
    margin-left: var(--space-md);
}

/* ============================================
   Tag Page
   ============================================ */
.tag-nav {
    margin-top: var(--space-2xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
}

.back-link {
    font-weight: 500;
    color: var(--color-text-light);
}

.back-link:hover {
    color: var(--color-primary);
}

/* ============================================
   About Page
   ============================================ */
.about-page .lead {
    font-size: 1.25rem;
    color: var(--color-text-light);
    line-height: 1.6;
}

.about-intro {
    margin-bottom: var(--space-xl);
}

.about-mission,
.about-topics,
.about-contact {
    margin-bottom: var(--space-xl);
}

/* ============================================
   Error Page (404)
   ============================================ */
.error-page {
    text-align: center;
    padding: var(--space-2xl) 0;
}

.error-header {
    margin-bottom: var(--space-2xl);
}

.error-code {
    font-size: 8rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
    margin: 0;
}

.error-title {
    font-size: 1.5rem;
    color: var(--color-text-light);
    margin: var(--space-md) 0 0;
}

.error-content p {
    font-size: 1.125rem;
    color: var(--color-text-light);
    margin-bottom: var(--space-xl);
}

.error-actions {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-2xl);
}

.btn {
    display: inline-block;
    padding: var(--space-sm) var(--space-lg);
    border-radius: 6px;
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.btn-primary {
    background: var(--color-primary);
    color: white;
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    color: white;
    text-decoration: none;
}

.btn-secondary {
    background: var(--color-bg-alt);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    text-decoration: none;
}

.error-suggestions {
    text-align: left;
    max-width: 400px;
    margin: 0 auto;
    padding: var(--space-lg);
    background: var(--color-bg-alt);
    border-radius: 8px;
}

.error-suggestions h2 {
    font-size: 1rem;
    font-weight: 600;
    margin: 0 0 var(--space-md);
}

.error-suggestions ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.error-suggestions li {
    padding: var(--space-xs) 0;
    color: var(--color-text-light);
}

@media (max-width: 480px) {
    .error-code {
        font-size: 5rem;
    }
    
    .error-actions {
        flex-direction: column;
    }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .site-header,
    .sidebar,
    .site-footer,
    .article-share,
    .pagination {
        display: none;
    }
    
    .container {
        display: block;
        max-width: none;
    }
    
    .article-content {
        font-size: 12pt;
    }
    
    .article-content a {
        text-decoration: underline;
    }
    
    .article-content pre {
        white-space: pre-wrap;
        border: 1px solid #ccc;
    }
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    width: 100%;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: url('/images/hero-banner.jpg') center center / cover no-repeat;
    background-color: var(--color-bg-alt);
    overflow: hidden;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        180deg,
        rgba(13, 17, 23, 0.7) 0%,
        rgba(13, 17, 23, 0.85) 100%
    );
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 800px;
    padding: var(--space-2xl) var(--space-lg);
}

.hero-headline {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--color-text);
    margin: 0 0 var(--space-md);
    letter-spacing: -0.02em;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

.hero-subhead {
    font-size: 1.375rem;
    color: var(--color-text-light);
    margin: 0 0 var(--space-xl);
    font-weight: 400;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
}

.hero-badges {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
}

.hero-badge {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    background: rgba(88, 166, 255, 0.15);
    border: 1px solid rgba(88, 166, 255, 0.4);
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-primary-light);
    backdrop-filter: blur(4px);
    transition: all var(--transition-fast);
}

.hero-badge:hover {
    background: rgba(88, 166, 255, 0.25);
    border-color: var(--color-primary);
    transform: translateY(-1px);
}

.hero-cta {
    display: inline-block;
    padding: var(--space-sm) var(--space-xl);
    background: var(--color-primary);
    color: var(--color-bg);
    font-size: 1rem;
    font-weight: 600;
    border-radius: 8px;
    text-decoration: none;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 14px rgba(88, 166, 255, 0.35);
}

.hero-cta:hover {
    background: var(--color-primary-light);
    color: var(--color-bg);
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(88, 166, 255, 0.45);
}

/* Hero Responsive */
@media (max-width: 768px) {
    .hero {
        min-height: 350px;
    }
    
    .hero-headline {
        font-size: 2.5rem;
    }
    
    .hero-subhead {
        font-size: 1.125rem;
    }
    
    .hero-badges {
        gap: var(--space-xs);
    }
    
    .hero-badge {
        font-size: 0.8125rem;
        padding: var(--space-xs) var(--space-sm);
    }
}

@media (max-width: 480px) {
    .hero {
        min-height: 300px;
    }
    
    .hero-content {
        padding: var(--space-xl) var(--space-md);
    }
    
    .hero-headline {
        font-size: 2rem;
    }
    
    .hero-subhead {
        font-size: 1rem;
    }
}