/* ===========================
   CSS Variables & Reset
   =========================== */

:root {
    /* Light mode colors */
    --color-bg: #ffffff;
    --color-bg-secondary: #f8f9fa;
    --color-text: #1a1a1a;
    --color-text-secondary: #6c757d;
    --color-border: #e9ecef;
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-link: #2563eb;
    --color-link-hover: #1d4ed8;
    --color-shadow: rgba(0, 0, 0, 0.05);
    --color-code-bg: #f5f5f5;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Layout */
    --container-width: 1200px;
    --container-narrow: 800px;
    --border-radius: 8px;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
}

/* Dark mode colors */
.dark-mode {
    --color-bg: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-text: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --color-border: #334155;
    --color-primary: #3b82f6;
    --color-primary-hover: #60a5fa;
    --color-link: #60a5fa;
    --color-link-hover: #93c5fd;
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-code-bg: #1e293b;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 18px;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* ===========================
   Typography
   =========================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-md);
}

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

a:hover {
    color: var(--color-link-hover);
}

strong {
    font-weight: 600;
}

em {
    font-style: italic;
}

/* ===========================
   Layout
   =========================== */

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

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

#main-content {
    min-height: calc(100vh - 200px);
    padding-top: var(--spacing-xl);
    padding-bottom: var(--spacing-2xl);
}

/* ===========================
   Header & Navigation
   =========================== */

.site-header {
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.9);
    transition: background-color var(--transition-base);
}

.dark-mode .site-header {
    background-color: rgba(15, 23, 42, 0.9);
}

.navbar {
    padding: var(--spacing-md) 0;
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-logo {
    text-decoration: none;
}

.site-name {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    transition: color var(--transition-fast);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-list {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-link {
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--color-primary);
}

/* Theme toggle */
.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    color: var(--color-text);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color var(--transition-fast);
}

.theme-toggle:hover {
    color: var(--color-primary);
}

.sun-icon {
    display: none;
}

.moon-icon {
    display: block;
}

.dark-mode .sun-icon {
    display: block;
}

.dark-mode .moon-icon {
    display: none;
}

/* Mobile menu toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-menu-toggle span {
    width: 25px;
    height: 2px;
    background-color: var(--color-text);
    transition: all var(--transition-fast);
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* ===========================
   Hero Section
   =========================== */

.hero {
    text-align: center;
    padding: var(--spacing-2xl) 0;
    background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-secondary) 100%);
    border-bottom: 1px solid var(--color-border);
}

.hero-title {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===========================
   Posts Grid & Cards
   =========================== */

.recent-posts {
    margin-top: var(--spacing-2xl);
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.post-card {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.post-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 24px var(--color-shadow);
}

.post-card-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.post-card-content {
    padding: var(--spacing-lg);
}

.post-date {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    display: block;
    margin-bottom: var(--spacing-sm);
}

.post-card .post-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.post-summary {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.read-more {
    color: var(--color-primary);
    font-weight: 500;
    font-size: 0.9rem;
}

/* ===========================
   Posts List
   =========================== */

.page-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.page-title {
    margin-bottom: var(--spacing-sm);
}

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

.posts-list {
    max-width: var(--container-narrow);
    margin: 0 auto;
}

.post-list-item {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--color-border);
}

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

.post-list-link {
    text-decoration: none;
    color: inherit;
    display: block;
    transition: transform var(--transition-base);
}

.post-list-link:hover {
    transform: translateX(2px);
}

.post-list-item .post-title {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
    transition: color var(--transition-fast);
}

.post-list-link:hover .post-title {
    color: var(--color-primary);
}

/* ===========================
   Single Post
   =========================== */

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

.post-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.post-single .post-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.post-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    flex-wrap: wrap;
}

.new-badge {
    background: linear-gradient(135deg, #ff6b6b, #ff8e8e);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 4px rgba(255, 107, 107, 0.3);
    animation: pulse 2s infinite;
    transition: all 0.3s ease-out;
    cursor: pointer;
    display: inline-block;
}

.new-badge:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 8px rgba(255, 107, 107, 0.4);
}

/* READ badge styling - using class instead of attribute selector */
.new-badge.read-badge {
    background: linear-gradient(135deg, #4ade80, #22c55e) !important;
    animation: none !important;
    transform: scale(1) !important;
    box-shadow: 0 2px 4px rgba(34, 197, 94, 0.3) !important;
}

@keyframes pulse {
    0% { 
        transform: scale(1); 
        box-shadow: 0 2px 4px rgba(255, 107, 107, 0.3);
    }
    50% { 
        transform: scale(1.05); 
        box-shadow: 0 4px 8px rgba(255, 107, 107, 0.5);
    }
    100% { 
        transform: scale(1); 
        box-shadow: 0 2px 4px rgba(255, 107, 107, 0.3);
    }
}

.separator {
    color: var(--color-text-secondary);
}

.post-description {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-top: var(--spacing-md);
    font-style: italic;
}

.post-content {
    font-size: 1.125rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
}

.post-content h2 {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.post-content h3 {
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.post-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    margin: var(--spacing-lg) 0;
}

.post-content blockquote {
    border-left: 4px solid var(--color-primary);
    padding-left: var(--spacing-md);
    margin: var(--spacing-lg) 0;
    font-style: italic;
    color: var(--color-text-secondary);
}

.post-content code {
    background-color: var(--color-code-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.9em;
}

.post-content pre {
    background-color: var(--color-code-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    overflow-x: auto;
    margin: var(--spacing-lg) 0;
}

.post-content pre code {
    background-color: transparent;
    padding: 0;
    font-size: 0.875rem;
}

.post-content ul,
.post-content ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
}

.post-content li {
    margin-bottom: var(--spacing-xs);
}

.post-footer {
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

/* ===========================
   Tags
   =========================== */

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

.tag {
    display: inline-block;
    padding: 4px 12px;
    background-color: var(--color-bg-secondary);
    color: var(--color-text-secondary);
    border-radius: 20px;
    font-size: 0.875rem;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

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

/* ===========================
   Pagination
   =========================== */

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-xl);
    list-style: none;
}

.page-item a {
    display: block;
    padding: var(--spacing-xs) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.page-item a:hover,
.page-item.active a {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

.page-item.disabled a {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ===========================
   Buttons
   =========================== */

.btn-primary {
    display: inline-block;
    padding: 12px 24px;
    background-color: var(--color-primary);
    color: white;
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
    border: none;
    cursor: pointer;
    text-decoration: none;
}

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    color: white;
    transform: translateY(-2px);
}

.view-all {
    text-align: center;
    margin-top: var(--spacing-xl);
}

/* ===========================
   Footer
   =========================== */

.site-footer {
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: var(--spacing-md);
    font-size: 1.125rem;
}

.footer-section p {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-links a {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

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

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-links a {
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

.social-links a:hover {
    color: var(--color-primary);
}

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

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

/* ===========================
   Responsive Design
   =========================== */

@media (max-width: 768px) {
    body {
        font-size: 16px;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.25rem; }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background-color: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        flex-direction: column;
        padding: var(--spacing-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: transform var(--transition-base), opacity var(--transition-base);
        gap: var(--spacing-sm);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-list {
        flex-direction: column;
        width: 100%;
        gap: var(--spacing-sm);
    }
    
    .nav-item {
        width: 100%;
        text-align: center;
    }
    
    .posts-grid {
        grid-template-columns: 1fr;
    }
    
    .post-single .post-title {
        font-size: 1.75rem;
    }
    
    .post-content {
        font-size: 1rem;
    }
    
    #main-content {
        padding-top: var(--spacing-lg);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
}

@media (max-width: 480px) {
    .container,
    .container-narrow {
        padding: 0 var(--spacing-sm);
    }
    
    .hero {
        padding: var(--spacing-xl) 0;
    }
    
    .post-meta {
        font-size: 0.8rem;
    }
}

/* ===========================
   Utilities
   =========================== */

.text-center {
    text-align: center;
}

.mt-lg {
    margin-top: var(--spacing-lg);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}