/*
Theme Name: Semantic Blog Theme
Theme URI: https://example.com/semantic-blog
Author: AI Developer
Author URI: https://example.com
Description: A clean, modern WordPress blog theme built with Semantic HTML5 standards. Features responsive design, accessibility ready, and optimized for SEO.
Version: 1.0.0
Requires at least: 5.0
Tested up to: 6.4
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: semantic-blog
Tags: blog, semantic-html, responsive, accessibility-ready, custom-menu, featured-images, footer-widgets, translation-ready
*/

/* ========================================
   CSS Custom Properties (Design Tokens)
   ======================================== */
:root {
    /* Colors */
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-secondary: #64748b;
    --color-accent: #f59e0b;

    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-text-muted: #94a3b8;

    --color-background: #ffffff;
    --color-background-alt: #f8fafc;
    --color-surface: #ffffff;

    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;

    /* Typography */
    --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-family-heading: 'Outfit', var(--font-family-primary);
    --font-family-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;

    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;

    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Layout */
    --container-max: 1200px;
    --container-content: 800px;
    --sidebar-width: 320px;

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;

    /* Shadows */
    --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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
    :root {
        --color-text: #f1f5f9;
        --color-text-light: #94a3b8;
        --color-text-muted: #64748b;

        --color-background: #0f172a;
        --color-background-alt: #1e293b;
        --color-surface: #1e293b;

        --color-border: #334155;
        --color-border-light: #1e293b;
    }
}

/* ========================================
   Reset & Base Styles
   ======================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background-color: var(--color-background);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ========================================
   Typography
   ======================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-family-heading);
    font-weight: 700;
    line-height: var(--line-height-tight);
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: var(--font-size-4xl);
}

h2 {
    font-size: var(--font-size-3xl);
}

h3 {
    font-size: var(--font-size-2xl);
}

h4 {
    font-size: var(--font-size-xl);
}

h5 {
    font-size: var(--font-size-lg);
}

h6 {
    font-size: var(--font-size-base);
}

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

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

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

/* ========================================
   Accessibility
   ======================================== */
.skip-link {
    position: absolute;
    top: -100%;
    left: 0;
    background: var(--color-primary);
    color: #fff;
    padding: var(--spacing-sm) var(--spacing-md);
    z-index: 9999;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 0;
}

.screen-reader-text {
    clip: rect(1px, 1px, 1px, 1px);
    position: absolute !important;
    height: 1px;
    width: 1px;
    overflow: hidden;
    word-wrap: normal !important;
}

.screen-reader-text:focus {
    background-color: var(--color-surface);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    clip: auto !important;
    color: var(--color-text);
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    height: auto;
    left: var(--spacing-sm);
    line-height: normal;
    padding: var(--spacing-md);
    text-decoration: none;
    top: var(--spacing-sm);
    width: auto;
    z-index: 100000;
}

/* ========================================
   Layout
   ======================================== */
.site-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.site-content {
    padding: var(--spacing-2xl) 0;
    flex: 1;
}

.site-content>.site-container {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-2xl);
}

.site-main {
    flex: 1;
    min-width: 0;
    width: 100%;
}

.widget-area {
    width: 100%;
}

@media (min-width: 1024px) {
    .site-content.has-sidebar>.site-container {
        flex-wrap: nowrap;
    }

    .site-content.has-sidebar .site-main {
        flex: 1;
        max-width: calc(100% - var(--sidebar-width) - var(--spacing-2xl));
        width: auto;
    }

    .site-content.has-sidebar .widget-area {
        width: var(--sidebar-width);
        flex-shrink: 0;
    }
}

/* ========================================
   Header
   ======================================== */
.site-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

@media (prefers-color-scheme: dark) {
    .site-header {
        background: rgba(15, 23, 42, 0.95);
    }
}

.site-header .site-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--spacing-md);
    padding-bottom: var(--spacing-md);
}

.site-branding {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.site-logo {
    max-height: 50px;
    width: auto;
}

.site-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin: 0;
}

.site-title a {
    color: var(--color-text);
    text-decoration: none;
}

.site-title a:hover {
    color: var(--color-primary);
}

.site-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin: 0;
}

/* Navigation */
.main-navigation {
    display: none;
}

@media (min-width: 768px) {
    .main-navigation {
        display: block;
    }
}

.main-navigation ul {
    list-style: none;
    display: flex;
    gap: var(--spacing-lg);
}

.main-navigation a {
    color: var(--color-text);
    font-weight: 500;
    padding: var(--spacing-sm) 0;
    position: relative;
}

.main-navigation a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-normal);
}

.main-navigation a:hover::after,
.main-navigation .current-menu-item a::after {
    width: 100%;
}

.main-navigation a:hover {
    color: var(--color-primary);
    text-decoration: none;
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
}

@media (min-width: 768px) {
    .menu-toggle {
        display: none;
    }
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    position: relative;
    transition: var(--transition-fast);
}

.menu-toggle span::before,
.menu-toggle span::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    left: 0;
    transition: var(--transition-fast);
}

.menu-toggle span::before {
    top: -8px;
}

.menu-toggle span::after {
    top: 8px;
}

/* Mobile Navigation Styles */
@media (max-width: 767px) {
    .main-navigation {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-surface);
        border-top: 1px solid var(--color-border);
        box-shadow: var(--shadow-lg);
        display: none;
        z-index: 999;
    }

    .main-navigation.toggled {
        display: block;
    }

    .main-navigation ul {
        flex-direction: column;
        gap: 0;
        padding: var(--spacing-md);
    }

    .main-navigation li {
        border-bottom: 1px solid var(--color-border-light);
    }

    .main-navigation li:last-child {
        border-bottom: none;
    }

    .main-navigation a {
        display: block;
        padding: var(--spacing-md);
    }

    .main-navigation a::after {
        display: none;
    }

    /* Toggled menu icon animation */
    .main-navigation.toggled+.menu-toggle span,
    .menu-toggle[aria-expanded="true"] span {
        background: transparent;
    }

    .menu-toggle[aria-expanded="true"] span::before {
        top: 0;
        transform: rotate(45deg);
    }

    .menu-toggle[aria-expanded="true"] span::after {
        top: 0;
        transform: rotate(-45deg);
    }

    /* Header layout for mobile */
    .site-header .site-container {
        position: relative;
    }
}

/* ========================================
   Articles
   ======================================== */
article {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border-light);
    transition: box-shadow var(--transition-normal), transform var(--transition-normal);
    margin-bottom: var(--spacing-xl);
}

article:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.entry-thumbnail {
    aspect-ratio: 16 / 9;
    overflow: hidden;
}

.entry-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

article:hover .entry-thumbnail img {
    transform: scale(1.05);
}

.entry-header {
    padding: var(--spacing-lg);
    padding-bottom: 0;
}

.entry-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
}

.entry-meta a {
    color: var(--color-text-light);
}

.entry-meta a:hover {
    color: var(--color-primary);
}

.entry-title {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-sm);
}

.entry-title a {
    color: var(--color-text);
}

.entry-title a:hover {
    color: var(--color-primary);
    text-decoration: none;
}

.entry-content,
.entry-summary {
    padding: var(--spacing-lg);
    padding-top: var(--spacing-md);
}

.entry-content>*:last-child,
.entry-summary>*:last-child {
    margin-bottom: 0;
}

.entry-footer {
    padding: var(--spacing-lg);
    padding-top: 0;
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

.entry-footer .cat-links,
.entry-footer .tags-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

/* Single Post Styles */
.single article {
    box-shadow: none;
    border: none;
}

.single .entry-header {
    text-align: center;
    padding: var(--spacing-2xl);
    padding-bottom: var(--spacing-lg);
}

.single .entry-title {
    font-size: var(--font-size-4xl);
}

.single .entry-content {
    max-width: var(--container-content);
    margin: 0 auto;
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
}

/* Content Styles */
.entry-content h2,
.entry-content h3,
.entry-content h4 {
    margin-top: var(--spacing-2xl);
}

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

.entry-content li {
    margin-bottom: var(--spacing-sm);
}

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

.entry-content pre {
    background: var(--color-background-alt);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    overflow-x: auto;
    font-family: var(--font-family-mono);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
}

.entry-content code {
    font-family: var(--font-family-mono);
    background: var(--color-background-alt);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.9em;
}

.entry-content pre code {
    background: transparent;
    padding: 0;
}

.entry-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
}

.entry-content figure {
    margin: var(--spacing-xl) 0;
}

.entry-content figcaption {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    text-align: center;
    margin-top: var(--spacing-sm);
}

/* Read More Button */
.read-more {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-primary);
    color: #fff;
    border-radius: var(--radius-full);
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.read-more:hover {
    background: var(--color-primary-dark);
    color: #fff;
    text-decoration: none;
    transform: translateX(4px);
}

/* ========================================
   Sidebar
   ======================================== */
#secondary.widget-area {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
    position: sticky;
    top: calc(var(--spacing-2xl) + 80px);
    align-self: flex-start;
}

.widget {
    background: var(--color-surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-light);
}

.widget-title {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-primary);
}

.widget ul {
    list-style: none;
}

.widget li {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-border-light);
}

.widget li:last-child {
    border-bottom: none;
}

.widget a {
    color: var(--color-text);
}

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

/* Search Widget */
.search-form {
    display: flex;
    gap: var(--spacing-sm);
}

.search-field {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    background: var(--color-background);
    color: var(--color-text);
}

.search-field:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-submit {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 500;
    transition: background var(--transition-fast);
}

.search-submit:hover {
    background: var(--color-primary-dark);
}

/* ========================================
   Pagination
   ======================================== */
.pagination,
.post-navigation,
.comments-pagination {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.pagination .nav-links,
.post-navigation .nav-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.pagination .page-numbers {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    height: 44px;
    padding: 0 var(--spacing-md);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.pagination .page-numbers:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
    text-decoration: none;
}

.pagination .page-numbers.current {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}

.post-navigation .nav-links {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.post-navigation .nav-previous,
.post-navigation .nav-next {
    padding: var(--spacing-lg);
    background: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    transition: border-color var(--transition-fast);
}

.post-navigation .nav-previous:hover,
.post-navigation .nav-next:hover {
    border-color: var(--color-primary);
}

.post-navigation .nav-next {
    text-align: right;
}

/* ========================================
   Comments
   ======================================== */
.comments-area {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.comments-title {
    margin-bottom: var(--spacing-xl);
}

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

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

.comment-body {
    background: var(--color-surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-light);
}

.comment-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.comment-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.comment-author .avatar {
    border-radius: var(--radius-full);
}

.comment-author .fn {
    font-weight: 600;
}

.comment-metadata {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

.comment-content {
    margin-bottom: var(--spacing-md);
}

.comment-reply-link {
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.children {
    list-style: none;
    margin-left: var(--spacing-xl);
    margin-top: var(--spacing-lg);
}

/* Comment Form */
.comment-respond {
    margin-top: var(--spacing-xl);
}

.comment-form label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.comment-form input[type="text"],
.comment-form input[type="email"],
.comment-form input[type="url"],
.comment-form textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    background: var(--color-background);
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.comment-form input:focus,
.comment-form textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.comment-form .submit {
    padding: var(--spacing-sm) var(--spacing-xl);
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
    font-size: var(--font-size-base);
    transition: background var(--transition-fast);
}

.comment-form .submit:hover {
    background: var(--color-primary-dark);
}

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

.footer-widgets {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    padding: var(--spacing-2xl) 0;
}

.site-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

@media (min-width: 768px) {
    .site-info {
        flex-direction: row;
        justify-content: center;
        flex-wrap: wrap;
    }
}

.site-info a {
    color: var(--color-text-light);
}

.site-info a:hover {
    color: var(--color-primary);
}

.site-info .sep {
    display: none;
}

@media (min-width: 768px) {
    .site-info .sep {
        display: inline;
    }
}

/* Footer Navigation */
.footer-navigation {
    width: 100%;
}

@media (min-width: 768px) {
    .footer-navigation {
        width: auto;
    }
}

.footer-menu {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm) var(--spacing-lg);
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-menu li {
    list-style: none;
}

.footer-menu a {
    color: var(--color-text-light);
    text-decoration: none;
    padding: var(--spacing-xs) 0;
    display: inline-block;
    transition: color var(--transition-fast);
}

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

/* ========================================
   404 Page
   ======================================== */
.error-404 {
    text-align: center;
    padding: var(--spacing-3xl) 0;
}

.error-404 .page-title {
    font-size: var(--font-size-5xl);
    margin-bottom: var(--spacing-md);
}

.error-404 .search-form {
    max-width: 400px;
    margin: var(--spacing-xl) auto;
}

/* ========================================
   Archive Header
   ======================================== */
.archive-header {
    text-align: center;
    padding: var(--spacing-2xl) 0;
    margin-bottom: var(--spacing-xl);
    background: var(--color-background-alt);
    border-radius: var(--radius-lg);
}

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

.archive-description {
    color: var(--color-text-light);
    max-width: var(--container-content);
    margin: 0 auto;
}

/* ========================================
   WordPress Core Styles
   ======================================== */
.alignleft {
    float: left;
    margin-right: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.alignright {
    float: right;
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.aligncenter {
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.wp-caption {
    max-width: 100%;
}

.wp-caption-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    text-align: center;
    padding: var(--spacing-sm);
}

.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.gallery-item {
    margin: 0;
}

.gallery-item img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-md);
}

/* Sticky Post */
.sticky {
    border: 2px solid var(--color-primary);
}

.sticky .entry-header::before {
    content: 'Featured';
    display: inline-block;
    background: var(--color-primary);
    color: #fff;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: var(--spacing-sm);
}

/* ========================================
   Utility Classes
   ======================================== */
.clearfix::after {
    content: '';
    display: table;
    clear: both;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ========================================
   Responsive Adjustments
   ======================================== */
@media (max-width: 768px) {
    :root {
        --font-size-4xl: 1.875rem;
        --font-size-3xl: 1.5rem;
        --font-size-2xl: 1.25rem;
    }

    .site-content {
        padding: var(--spacing-lg) 0;
        gap: var(--spacing-xl);
    }

    .entry-header,
    .entry-content,
    .entry-summary,
    .entry-footer {
        padding: var(--spacing-md);
    }

    .single .entry-header {
        padding: var(--spacing-lg);
    }

    .single .entry-content {
        font-size: var(--font-size-base);
    }

    .post-navigation .nav-links {
        grid-template-columns: 1fr;
    }

    .children {
        margin-left: var(--spacing-md);
    }
}

/* ========================================
   Breadcrumbs
   ======================================== */
.breadcrumbs {
    padding: var(--spacing-md) 0;
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

.breadcrumb-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--spacing-xs);
}

.breadcrumb-item {
    display: flex;
    align-items: center;
}

.breadcrumb-item:not(:last-child)::after {
    content: '/';
    margin-left: var(--spacing-xs);
    color: var(--color-text-muted);
}

.breadcrumb-item a {
    color: var(--color-text-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.breadcrumb-item a:hover {
    color: var(--color-primary);
}

.breadcrumb-item.current {
    color: var(--color-text);
    font-weight: 500;
}

/* ========================================
   Reading Time
   ======================================== */
.reading-time {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
}

.reading-time::before {
    content: '📖';
    font-size: 0.9em;
}

/* ========================================
   Author Bio
   ======================================== */
.author-bio {
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
    background: var(--color-background-alt);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-light);
}

.author-avatar img {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-full);
    object-fit: cover;
}

.author-info {
    flex: 1;
}

.author-name {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xs);
}

.author-name a {
    color: var(--color-text);
    text-decoration: none;
}

.author-name a:hover {
    color: var(--color-primary);
}

.author-description {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
    line-height: var(--line-height-relaxed);
}

.author-link {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-primary);
}

.author-link:hover {
    text-decoration: underline;
}

@media (max-width: 600px) {
    .author-bio {
        flex-direction: column;
        text-align: center;
    }

    .author-avatar {
        align-self: center;
    }
}

/* ========================================
   Performance: Content Visibility
   ======================================== */
.widget-area,
.comments-area,
.site-footer {
    content-visibility: auto;
    contain-intrinsic-size: auto 500px;
}

/* ========================================
   Additional SEO-friendly elements
   ======================================== */
.updated:not(.published) {
    display: none;
}

/* Focus visible for keyboard navigation */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ========================================
   Related Posts
   ======================================== */
.related-posts {
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-xl);
    background: var(--color-background-alt);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-light);
}

.related-posts-title {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-primary);
}

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

.related-post-item {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-border-light);
}

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

.related-post-item a {
    color: var(--color-text);
    text-decoration: none;
    display: block;
    padding: var(--spacing-xs) 0;
    transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.related-post-item a:hover {
    color: var(--color-primary);
    padding-left: var(--spacing-sm);
}

.related-post-item a::before {
    content: '→';
    margin-right: var(--spacing-sm);
    color: var(--color-primary);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.related-post-item a:hover::before {
    opacity: 1;
}

/* ========================================
   Category Grouped Layout
   ======================================== */
.category-grouped-layout {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2xl);
}

.category-section {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border-light);
}

.category-header {
    background: linear-gradient(135deg, #374151 0%, #1f2937 100%);
    padding: var(--spacing-md) var(--spacing-lg);
}

.category-title {
    margin: 0;
    font-size: var(--font-size-xl);
}

.category-title a {
    color: #fff;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.category-title a:hover {
    color: var(--color-accent);
}

.category-count {
    font-weight: 400;
    opacity: 0.8;
}

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

.post-item {
    border-bottom: 1px solid var(--color-border-light);
}

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

.post-list-article {
    padding: var(--spacing-md) var(--spacing-lg);
    transition: background var(--transition-fast);
}

.post-list-article:hover {
    background: var(--color-background-alt);
}

.post-list-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin: 0 0 var(--spacing-xs);
    line-height: var(--line-height-tight);
}

.post-list-title a {
    color: var(--color-text);
    text-decoration: none;
}

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

.post-list-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

.post-list-meta span {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.post-list-meta svg {
    opacity: 0.6;
}

.category-view-all {
    display: block;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-background-alt);
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-sm);
    text-align: right;
    transition: background var(--transition-fast);
}

.category-view-all:hover {
    background: var(--color-border-light);
}

/* Dark mode for category header */
@media (prefers-color-scheme: dark) {
    .category-header {
        background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    }
}

/* ========================================
   Products
   ======================================== */

/* Product Grid */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

/* Product Card */
.product-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border-light);
    transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

.product-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

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

.product-card-image {
    position: relative;
    aspect-ratio: 1;
    overflow: hidden;
    background: var(--color-background-alt);
}

.product-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.product-card:hover .product-card-image img {
    transform: scale(1.05);
}

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

.product-card-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    line-height: var(--line-height-tight);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-card-actions {
    padding: 0 var(--spacing-md) var(--spacing-md);
}

/* Product Badges */
.product-badge {
    position: absolute;
    top: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
    border-radius: var(--radius-sm);
    z-index: 1;
}

.affiliate-badge {
    left: var(--spacing-sm);
    background: var(--color-secondary);
    color: #fff;
}

.sale-badge {
    right: var(--spacing-sm);
    background: #ef4444;
    color: #fff;
}

.outofstock-badge {
    right: var(--spacing-sm);
    background: var(--color-text-muted);
    color: #fff;
}

/* Product Price */
.product-price {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.price-current {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-primary);
}

.price-original {
    font-size: var(--font-size-base);
    color: var(--color-text-muted);
    text-decoration: line-through;
}

.price-sale {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: #ef4444;
}

.price-discount {
    font-size: var(--font-size-xs);
    font-weight: 600;
    background: #fef2f2;
    color: #ef4444;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

/* Product Button */
.product-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-primary);
    color: #fff;
    font-weight: 600;
    font-size: var(--font-size-base);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.product-button:hover {
    background: var(--color-primary-dark);
    color: #fff;
    text-decoration: none;
    transform: translateY(-1px);
}

.product-button.disabled {
    background: var(--color-text-muted);
    pointer-events: none;
    cursor: not-allowed;
}

/* Single Product */
.product-single {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.product-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
    padding: var(--spacing-xl);
}

@media (min-width: 768px) {
    .product-layout {
        grid-template-columns: 1fr 1fr;
    }
}

.product-gallery {
    position: relative;
}

.product-image {
    margin: 0;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.product-image img {
    width: 100%;
    height: auto;
}

.product-image-placeholder {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-background-alt);
    border-radius: var(--radius-lg);
    color: var(--color-text-muted);
}

.product-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.product-header {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.product-brand {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.product-title {
    font-size: var(--font-size-3xl);
    margin: 0;
}

.product-sku {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.product-price-box {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.product-price-box .product-price {
    font-size: var(--font-size-2xl);
}

.product-availability {
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.product-availability.instock {
    color: #22c55e;
}

.product-availability.outofstock {
    color: #ef4444;
}

.product-availability.preorder {
    color: var(--color-accent);
}

.product-actions .product-button {
    width: auto;
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: var(--font-size-lg);
}

.product-excerpt {
    color: var(--color-text-light);
    line-height: var(--line-height-relaxed);
}

.product-categories {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

.product-categories a {
    color: var(--color-primary);
}

/* Product Description */
.product-description {
    padding: var(--spacing-xl);
    border-top: 1px solid var(--color-border-light);
}

.product-description h2 {
    margin-bottom: var(--spacing-lg);
}

.product-content {
    max-width: var(--container-content);
    line-height: var(--line-height-relaxed);
}

/* Related Products (in single product) */
.related-products {
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-xl);
    background: var(--color-background-alt);
    border-radius: var(--radius-lg);
}

.related-products h3 {
    margin-bottom: var(--spacing-lg);
}

.related-products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: var(--spacing-lg);
}

.related-product-item {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: box-shadow var(--transition-fast);
}

.related-product-item:hover {
    box-shadow: var(--shadow-md);
}

.related-product-item a {
    display: block;
    text-decoration: none;
    color: inherit;
}

.related-product-item img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
}

.related-product-item h4 {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.related-product-item .product-price {
    padding: 0 var(--spacing-md) var(--spacing-md);
    font-size: var(--font-size-sm);
}

/* Product Responsive Improvements */
@media (max-width: 767px) {
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }

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

    .product-card-title {
        font-size: var(--font-size-sm);
    }

    .product-card-actions {
        padding: 0 var(--spacing-sm) var(--spacing-sm);
    }

    .product-button {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: var(--font-size-sm);
    }

    .product-layout {
        padding: var(--spacing-md);
        gap: var(--spacing-lg);
    }

    .product-title {
        font-size: var(--font-size-2xl);
    }

    .product-actions .product-button {
        width: 100%;
        padding: var(--spacing-md);
    }

    .product-description {
        padding: var(--spacing-md);
    }

    .related-products {
        padding: var(--spacing-md);
    }

    .related-products-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }

    .product-badge {
        font-size: 10px;
        padding: 2px 6px;
    }

    .price-current,
    .price-sale {
        font-size: var(--font-size-base);
    }

    .price-original {
        font-size: var(--font-size-sm);
    }
}

@media (max-width: 480px) {
    .products-grid {
        grid-template-columns: 1fr;
    }

    .related-products-grid {
        grid-template-columns: 1fr 1fr;
    }
}

/* ========================================
   Social Share Buttons
   ======================================== */
.social-share {
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-lg);
    background: var(--color-background-alt);
    border-radius: var(--radius-lg);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--spacing-md);
}

.share-label {
    font-weight: 600;
    color: var(--color-text-light);
}

.share-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.share-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    color: #fff;
    text-decoration: none;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
    border: none;
    cursor: pointer;
}

.share-button:hover {
    transform: translateY(-2px);
    opacity: 0.9;
}

.share-facebook {
    background: #1877f2;
}

.share-twitter {
    background: #000;
}

.share-linkedin {
    background: #0a66c2;
}

.share-pinterest {
    background: #e60023;
}

.share-telegram {
    background: #0088cc;
}

.share-copy {
    background: var(--color-text-muted);
}

.share-button.copied {
    background: #22c55e !important;
}

/* ========================================
   Table of Contents
   ======================================== */
.table-of-contents {
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-lg);
    background: var(--color-background-alt);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--color-primary);
}

.toc-title {
    font-weight: 600;
    font-size: var(--font-size-lg);
    cursor: pointer;
    padding: var(--spacing-sm) 0;
    user-select: none;
}

.toc-title::-webkit-details-marker {
    display: none;
}

.toc-title::before {
    content: '📋 ';
}

.toc-list {
    margin: var(--spacing-md) 0 0;
    padding-left: var(--spacing-lg);
    list-style: decimal;
}

.toc-list li {
    margin: var(--spacing-xs) 0;
    padding: var(--spacing-xs) 0;
}

.toc-list a {
    color: var(--color-text);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.toc-level-3 {
    margin-left: var(--spacing-md);
}

.toc-level-4 {
    margin-left: var(--spacing-xl);
}

/* ========================================
   Back to Top Button
   ======================================== */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 48px;
    height: 48px;
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
}

/* ========================================
   Sticky Header Enhancement
   ======================================== */
.site-header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
}

.site-header.scrolled .site-branding {
    padding: var(--spacing-sm) 0;
}

.site-header.scrolled .site-title {
    font-size: var(--font-size-xl);
}

/* ========================================
   Print Styles
   ======================================== */
@media print {

    .site-header,
    .site-footer,
    .sidebar,
    .social-share,
    .back-to-top,
    .menu-toggle,
    .main-navigation,
    .related-posts,
    .author-bio,
    .comments-area,
    .post-navigation,
    .breadcrumbs {
        display: none !important;
    }

    .site-content {
        display: block !important;
    }

    .site-main {
        width: 100% !important;
        max-width: none !important;
        margin: 0 !important;
        padding: 0 !important;
    }

    article {
        box-shadow: none !important;
        border: none !important;
    }

    a {
        color: inherit !important;
        text-decoration: underline;
    }

    a[href^="http"]::after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
    }

    .entry-content img {
        max-width: 100% !important;
        page-break-inside: avoid;
    }

    h1,
    h2,
    h3,
    h4,
    h5,
    h6 {
        page-break-after: avoid;
    }

    p,
    li {
        orphans: 3;
        widows: 3;
    }
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}