/*
Theme Name: EmbedSnap
Theme URI: https://embedsnap.com/
Description: A professional tech news theme for embedded systems, microcontrollers, and AI development boards.
Version: 1.0
Author: EmbedSnap Team
Author URI: https://embedsnap.com/
Text Domain: embedsnap
Tags: tech, news, embedded, responsive, dark-theme, light-theme
*/

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

/* CSS Variables */
:root {
    /* Light Theme */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-sidebar: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --accent-primary: #3b82f6;
    --accent-secondary: #0ea5e9;
    --border-color: #e2e8f0;
    --card-bg: #ffffff;
    
    /* Dark Theme */
    --dark-bg-primary: #0f172a;
    --dark-bg-secondary: #1e293b;
    --dark-bg-sidebar: #1e293b;
    --dark-text-primary: #f1f5f9;
    --dark-text-secondary: #cbd5e1;
    --dark-text-muted: #64748b;
    --dark-accent-primary: #60a5fa;
    --dark-accent-secondary: #22d3ee;
    --dark-border-color: #334155;
    --dark-card-bg: #1e293b;
    
    /* Fonts */
    --font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Dark Theme Styles */
body.dark-theme {
    --bg-primary: var(--dark-bg-primary);
    --bg-secondary: var(--dark-bg-secondary);
    --bg-sidebar: var(--dark-bg-sidebar);
    --text-primary: var(--dark-text-primary);
    --text-secondary: var(--dark-text-secondary);
    --text-muted: var(--dark-text-muted);
    --accent-primary: var(--dark-accent-primary);
    --accent-secondary: var(--dark-accent-secondary);
    --border-color: var(--dark-border-color);
    --card-bg: var(--dark-card-bg);
}

/* Base Styles */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

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

a:hover {
    color: var(--accent-secondary);
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header */
.site-header {
    position: fixed;
    top: 0;
    right: 0;
    left: 280px;
    z-index: 100;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-sm) var(--spacing-md);
    transition: all var(--transition-normal);
}

@media (max-width: 1024px) {
    .site-header {
        left: 0;
    }
}

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

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
}

/* Search Bar */
.search-wrapper {
    flex: 1;
    max-width: 500px;
    margin: 0 var(--spacing-lg);
}

.search-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.search-input::placeholder {
    color: var(--text-muted);
}

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-sm);
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

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

/* Sidebar */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 280px;
    height: 100vh;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    padding: var(--spacing-md);
    overflow-y: auto;
    transition: all var(--transition-normal);
    z-index: 101;
}

.sidebar.collapsed {
    width: 0;
    padding: 0;
    overflow: hidden;
}

.sidebar-toggle {
    position: absolute;
    right: -12px;
    top: 20px;
    background-color: var(--bg-sidebar);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    z-index: 102;
}

.sidebar-toggle:hover {
    background-color: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
}

@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .sidebar-toggle {
        right: auto;
        left: 12px;
        top: 12px;
    }
}

/* Sidebar Logo */
.sidebar-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.sidebar-logo-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    object-fit: contain;
}

.sidebar-logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Sidebar Navigation */
.nav-section {
    margin-bottom: var(--spacing-lg);
}

.nav-section-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
    padding-left: var(--spacing-sm);
}

.nav-list {
    list-style: none;
}

.nav-item {
    margin-bottom: 2px;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm);
    border-radius: 6px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.nav-link:hover {
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--accent-primary);
}

.nav-link.active {
    background-color: rgba(59, 130, 246, 0.15);
    color: var(--accent-primary);
    font-weight: 500;
}

.nav-link-icon {
    margin-right: var(--spacing-sm);
    font-size: 0.875rem;
}

/* Main Content */
.main-content {
    margin-left: 280px;
    padding-top: 70px;
    min-height: 100vh;
    transition: margin-left var(--transition-normal);
}

.sidebar.collapsed ~ .main-content {
    margin-left: 0;
}

@media (max-width: 1024px) {
    .main-content {
        margin-left: 0;
    }
}

/* Hero Section */
.hero-section {
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid var(--border-color);
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 800px;
}

/* Category Filters */
.category-filters {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
}

.filter-tag {
    padding: var(--spacing-xs) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    background-color: var(--bg-primary);
}

.filter-tag:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.filter-tag.active {
    background-color: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
}

/* Articles Grid */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-lg);
    padding: var(--spacing-xl) 0;
}

@media (max-width: 768px) {
    .articles-grid {
        grid-template-columns: 1fr;
    }
}

/* Article Card */
.article-card-link {
    display: block;
    text-decoration: none;
    color: inherit;
    transition: all var(--transition-normal);
}

.article-card-link:hover {
    text-decoration: none;
    color: inherit;
}

.article-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    transition: all var(--transition-normal);
    cursor: pointer;
}

.article-card-link:hover .article-card {
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
    border-color: var(--accent-primary);
}

.article-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
}

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

.article-category {
    display: inline-block;
    padding: 2px 8px;
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--accent-primary);
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: 4px;
    margin-bottom: var(--spacing-sm);
}

.article-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    line-height: 1.4;
    transition: color var(--transition-fast);
}

.article-card-link:hover .article-title {
    color: var(--accent-primary);
}

.article-excerpt {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.article-date {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* Full Article */
.full-article {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-xl) 0;
}

.article-header {
    margin-bottom: var(--spacing-xl);
}

.article-full-title {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.article-full-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--text-muted);
    font-size: 0.9rem;
}

.article-full-content {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.article-full-content p {
    margin-bottom: var(--spacing-md);
}

.article-full-content h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: var(--spacing-xl) 0 var(--spacing-md);
}

.article-full-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: var(--spacing-lg) 0 var(--spacing-sm);
}

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

.article-full-content code {
    background-color: rgba(59, 130, 246, 0.1);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.9em;
    color: var(--accent-primary);
}

/* Footer */
.site-footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-xl) 0;
    margin-left: 280px;
    transition: margin-left var(--transition-normal);
}

.sidebar.collapsed ~ .main-content .site-footer {
    margin-left: 0;
}

@media (max-width: 1024px) {
    .site-footer {
        margin-left: 0;
    }
}

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

.footer-section-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

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

.footer-link {
    display: block;
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: var(--spacing-md);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: var(--spacing-sm);
    cursor: pointer;
    color: var(--text-secondary);
}

@media (max-width: 1024px) {
    .mobile-menu-toggle {
        display: block;
    }
}

/* Loading State */
.loading {
    display: flex;
    justify-content: center;
    padding: var(--spacing-xl);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Scrollbar Styles */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-sidebar);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}