/*
Theme Name: Filter
Theme URI: #
Author: Theme Developer
Author URI: #
Description: Dark neon tech blog theme inspired by modern tech news sites. Features dark backgrounds, neon accents, and card-based layouts.
Version: 1.4.1
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: filter
Tags: blog, news, dark, one-column, two-columns, custom-colors, custom-menu, custom-logo, featured-images, footer-widgets, theme-options, translation-ready
*/

/* ==========================================================================
   CSS Variables
   ========================================================================== */

:root {
    /* Colors - Dark Neon */
    --filter-bg-primary: #0a0a0f;
    --filter-bg-secondary: #12121a;
    --filter-bg-tertiary: #1a1a25;
    --filter-bg-card: #15151f;
    --filter-text-primary: #f0f0f5;
    --filter-text-secondary: #a0a0b0;
    --filter-text-muted: #606070;
    --filter-accent-cyan: #00d4ff;
    --filter-accent-magenta: #ff00aa;
    --filter-accent-purple: #8b5cf6;
    --filter-accent-green: #00ff88;
    --filter-border-color: #2a2a3a;
    --filter-link-color: #00d4ff;
    --filter-link-hover: #00ffff;

    /* Typography */
    --filter-font-primary: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --filter-font-secondary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --filter-font-mono: 'JetBrains Mono', 'Fira Code', monospace;

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

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

    /* Effects */
    --filter-glow-cyan: 0 0 20px rgba(0, 212, 255, 0.3);
    --filter-glow-magenta: 0 0 20px rgba(255, 0, 170, 0.3);
    --filter-transition: 0.2s ease;
    --filter-radius: 8px;
    --filter-radius-lg: 12px;
}

/* ==========================================================================
   Base Styles
   ========================================================================== */

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--filter-font-secondary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--filter-text-primary);
    background-color: var(--filter-bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--filter-font-primary);
    font-weight: 700;
    line-height: 1.2;
    margin: 0 0 var(--filter-spacing-md);
    color: var(--filter-text-primary);
}

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: 0 0 var(--filter-spacing-md);
}

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

a:hover,
a:focus {
    color: var(--filter-link-hover);
    text-shadow: var(--filter-glow-cyan);
}

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

ul, ol {
    margin: 0 0 var(--filter-spacing-md);
    padding-left: var(--filter-spacing-lg);
}

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

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

.filter-main-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--filter-spacing-xl);
    padding: var(--filter-spacing-xl) 0;
}

@media (min-width: 1024px) {
    .filter-main-content.filter-content-sidebar {
        grid-template-columns: 1fr var(--filter-sidebar-width);
    }

    .filter-main-content.filter-content-sidebar.filter-sidebar-left {
        grid-template-columns: var(--filter-sidebar-width) 1fr;
    }

    .filter-main-content.filter-content-sidebar.filter-sidebar-left .filter-sidebar {
        order: -1;
    }
}

/* ==========================================================================
   Header
   ========================================================================== */

.filter-header {
    background: var(--filter-bg-secondary);
    border-bottom: 1px solid var(--filter-border-color);
    position: sticky;
    top: 0;
    z-index: 1100;
}

.filter-header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--filter-spacing-md) 0;
    gap: var(--filter-spacing-md);
    position: relative;
}

.filter-site-branding {
    flex-shrink: 0;
}

.filter-site-title {
    margin: 0;
    font-size: 1.5rem;
    font-family: var(--filter-font-primary);
    font-weight: 700;
    letter-spacing: -0.02em;
}

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

.filter-site-title a:hover {
    color: var(--filter-accent-cyan);
    text-shadow: var(--filter-glow-cyan);
}

.filter-site-description {
    margin: 0;
    font-size: 0.75rem;
    color: var(--filter-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.filter-site-branding .custom-logo,
.filter-site-branding img {
    max-height: 40px;
    width: auto;
    display: block;
}

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

.filter-nav-menu {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: var(--filter-spacing-lg);
}

.filter-nav-menu li {
    position: relative;
}

.filter-nav-menu a {
    display: block;
    padding: var(--filter-spacing-sm) 0;
    color: var(--filter-text-secondary);
    font-family: var(--filter-font-primary);
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: color var(--filter-transition);
}

.filter-nav-menu a:hover,
.filter-nav-menu .current-menu-item > a {
    color: var(--filter-accent-cyan);
}

/* Submenu */
.filter-nav-menu .sub-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background: var(--filter-bg-secondary);
    border: 1px solid var(--filter-border-color);
    border-radius: var(--filter-radius);
    padding: var(--filter-spacing-sm) 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--filter-transition);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

.filter-nav-menu li:hover > .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.filter-nav-menu .sub-menu a {
    padding: var(--filter-spacing-sm) var(--filter-spacing-md);
    text-transform: none;
}

/* Mobile Menu Toggle */
.filter-menu-toggle {
    display: flex;
    flex-direction: column;
    gap: 5px;
    padding: var(--filter-spacing-sm);
    background: transparent;
    border: 1px solid var(--filter-border-color);
    border-radius: var(--filter-radius);
    cursor: pointer;
    position: relative;
    z-index: 1050;
    transition: all var(--filter-transition);
}

.filter-menu-toggle:hover {
    border-color: var(--filter-accent-cyan);
    box-shadow: var(--filter-glow-cyan);
}

.filter-menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--filter-text-primary);
    transition: all var(--filter-transition);
}

.filter-toggle-active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.filter-toggle-active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

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

.filter-hero {
    background: var(--filter-bg-secondary);
    border-bottom: 1px solid var(--filter-border-color);
    padding: var(--filter-spacing-2xl) 0;
}

.filter-hero-post {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--filter-spacing-xl);
    align-items: center;
}

.filter-hero-image {
    position: relative;
    overflow: hidden;
    border-radius: var(--filter-radius-lg);
    aspect-ratio: 16/9;
}

.filter-hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.filter-hero-post:hover .filter-hero-image img {
    transform: scale(1.05);
}

.filter-hero-content {
    padding: var(--filter-spacing-md) 0;
}

.filter-hero-category {
    display: inline-block;
    padding: var(--filter-spacing-xs) var(--filter-spacing-sm);
    background: var(--filter-accent-cyan);
    color: var(--filter-bg-primary);
    font-family: var(--filter-font-primary);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: 4px;
    margin-bottom: var(--filter-spacing-md);
}

.filter-hero-title {
    font-size: 2rem;
    margin-bottom: var(--filter-spacing-md);
}

.filter-hero-title a {
    color: var(--filter-text-primary);
}

.filter-hero-title a:hover {
    color: var(--filter-accent-cyan);
    text-shadow: var(--filter-glow-cyan);
}

.filter-hero-excerpt {
    color: var(--filter-text-secondary);
    font-size: 1.125rem;
    line-height: 1.7;
    margin-bottom: var(--filter-spacing-md);
}

.filter-hero-meta {
    display: flex;
    gap: var(--filter-spacing-md);
    color: var(--filter-text-muted);
    font-size: 0.875rem;
}

/* ==========================================================================
   Post Cards
   ========================================================================== */

.filter-posts-section {
    padding: var(--filter-spacing-2xl) 0;
}

.filter-section-title {
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--filter-accent-cyan);
    margin-bottom: var(--filter-spacing-xl);
    padding-bottom: var(--filter-spacing-sm);
    border-bottom: 2px solid var(--filter-accent-cyan);
    display: inline-block;
}

.filter-posts-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--filter-spacing-lg);
}

.filter-posts-grid.grid-list .filter-post-card {
    display: flex;
    flex-direction: row;
    gap: 1.5rem;
}

.filter-posts-grid.grid-list .filter-post-card .filter-card-image {
    flex: 0 0 280px;
}

.filter-posts-grid.grid-list .filter-post-card .filter-card-content {
    flex: 1;
}

.filter-post-card {
    background: var(--filter-bg-card);
    border: 1px solid var(--filter-border-color);
    border-radius: var(--filter-radius-lg);
    overflow: hidden;
    transition: all var(--filter-transition);
}

.filter-post-card:hover {
    border-color: var(--filter-accent-cyan);
    box-shadow: var(--filter-glow-cyan);
    transform: translateY(-4px);
}

.filter-card-image {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
}

.filter-card-image img {
    width: 100%;
    height: auto;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.filter-post-card:hover .filter-card-image img {
    transform: scale(1.1);
}

.filter-card-category {
    position: absolute;
    top: var(--filter-spacing-sm);
    left: var(--filter-spacing-sm);
    padding: var(--filter-spacing-xs) var(--filter-spacing-sm);
    background: var(--filter-accent-magenta);
    color: white;
    font-family: var(--filter-font-primary);
    font-size: 0.625rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: 4px;
}

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

.filter-card-title {
    font-size: 1.125rem;
    margin-bottom: var(--filter-spacing-sm);
    line-height: 1.3;
}

.filter-card-title a {
    color: var(--filter-text-primary);
}

.filter-card-title a:hover {
    color: var(--filter-accent-cyan);
}

.filter-card-excerpt {
    color: var(--filter-text-secondary);
    font-size: 0.875rem;
    line-height: 1.6;
    margin-bottom: var(--filter-spacing-md);
}

.filter-card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--filter-text-muted);
    font-size: 0.75rem;
}

.filter-card-date {
    display: flex;
    align-items: center;
    gap: var(--filter-spacing-xs);
}

.filter-card-reading-time {
    color: var(--filter-accent-purple);
}

/* Sticky Post */
.filter-sticky-badge {
    display: inline-block;
    background: var(--filter-accent-cyan);
    color: var(--filter-bg-primary);
    padding: 0.125rem 0.5rem;
    font-size: 0.625rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}
.filter-sticky-post {
    border-left: 3px solid var(--filter-accent-cyan);
}

/* ==========================================================================
   Sidebar
   ========================================================================== */

.filter-sidebar {
    display: none;
}

.filter-widget {
    background: var(--filter-bg-card);
    border: 1px solid var(--filter-border-color);
    border-radius: var(--filter-radius-lg);
    padding: var(--filter-spacing-lg);
    margin-bottom: var(--filter-spacing-lg);
}

.filter-widget-title {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--filter-accent-cyan);
    margin-bottom: var(--filter-spacing-md);
    padding-bottom: var(--filter-spacing-sm);
    border-bottom: 1px solid var(--filter-border-color);
}

.filter-widget ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

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

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

.filter-widget a {
    color: var(--filter-text-secondary);
    font-size: 0.875rem;
}

.filter-widget a:hover {
    color: var(--filter-accent-cyan);
}

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

.filter-search-form input[type="search"] {
    flex: 1;
    padding: var(--filter-spacing-sm) var(--filter-spacing-md);
    background: var(--filter-bg-secondary);
    border: 1px solid var(--filter-border-color);
    border-radius: var(--filter-radius);
    color: var(--filter-text-primary);
    font-size: 0.875rem;
}

.filter-search-form input[type="search"]:focus {
    outline: none;
    border-color: var(--filter-accent-cyan);
    box-shadow: var(--filter-glow-cyan);
}

.filter-search-form button {
    padding: var(--filter-spacing-sm) var(--filter-spacing-md);
    background: var(--filter-accent-cyan);
    color: var(--filter-bg-primary);
    border: none;
    border-radius: var(--filter-radius);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--filter-transition);
}

.filter-search-form button:hover {
    background: var(--filter-link-hover);
    box-shadow: var(--filter-glow-cyan);
}

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

.filter-single-post {
    max-width: var(--filter-content-width);
    margin: 0 auto;
    padding: var(--filter-spacing-2xl) var(--filter-spacing-md);
}

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

.filter-post-category {
    display: inline-block;
    padding: var(--filter-spacing-xs) var(--filter-spacing-sm);
    background: var(--filter-accent-magenta);
    color: white;
    font-family: var(--filter-font-primary);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: 4px;
    margin-bottom: var(--filter-spacing-md);
}

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

.filter-post-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--filter-spacing-md);
    color: var(--filter-text-muted);
    font-size: 0.875rem;
}

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

.filter-author-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 2px solid var(--filter-accent-cyan);
}

.filter-featured-image {
    margin-bottom: var(--filter-spacing-xl);
    border-radius: var(--filter-radius-lg);
    overflow: hidden;
}

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

/* Post Content */
.filter-post-content {
    font-size: 1.125rem;
    line-height: 1.8;
}

.filter-post-content p {
    margin-bottom: var(--filter-spacing-lg);
}

.filter-post-content h2 {
    margin-top: var(--filter-spacing-2xl);
    color: var(--filter-accent-cyan);
}

.filter-post-content h3 {
    margin-top: var(--filter-spacing-xl);
}

.filter-post-content blockquote {
    margin: var(--filter-spacing-xl) 0;
    padding: var(--filter-spacing-lg);
    background: var(--filter-bg-card);
    border-left: 4px solid var(--filter-accent-cyan);
    border-radius: 0 var(--filter-radius) var(--filter-radius) 0;
    font-style: italic;
    color: var(--filter-text-secondary);
}

.filter-post-content pre {
    background: var(--filter-bg-secondary);
    padding: var(--filter-spacing-lg);
    border-radius: var(--filter-radius);
    overflow-x: auto;
    font-family: var(--filter-font-mono);
    font-size: 0.875rem;
    border: 1px solid var(--filter-border-color);
}

.filter-post-content code {
    font-family: var(--filter-font-mono);
    background: var(--filter-bg-secondary);
    padding: 0.1em 0.4em;
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--filter-accent-green);
}

.filter-post-content pre code {
    background: none;
    padding: 0;
}
.filter-post-content table { width: 100%; border-collapse: collapse; margin: 1.5em 0; font-size: 0.9375rem; overflow-x: auto; display: block; }
.filter-post-content thead { background: var(--filter-bg-tertiary, #f4f4f4); }
.filter-post-content th, .filter-post-content td { padding: 0.75rem 1rem; border: 1px solid var(--filter-border-color, #ddd); text-align: left; vertical-align: top; }
.filter-post-content th { font-weight: 700; white-space: nowrap; }
.filter-post-content tr:nth-child(even) { background: var(--filter-bg-tertiary, #f8f8f8); }

/* Post Tags */
.filter-post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--filter-spacing-sm);
    margin-top: var(--filter-spacing-xl);
    padding-top: var(--filter-spacing-lg);
    border-top: 1px solid var(--filter-border-color);
}

.filter-tag {
    display: inline-block;
    padding: var(--filter-spacing-xs) var(--filter-spacing-sm);
    background: var(--filter-bg-tertiary);
    color: var(--filter-text-secondary);
    font-size: 0.75rem;
    border-radius: 4px;
    transition: all var(--filter-transition);
}

.filter-tag:hover {
    background: var(--filter-accent-purple);
    color: white;
}

/* Post Navigation */
.filter-post-navigation {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--filter-spacing-lg);
    margin-top: var(--filter-spacing-2xl);
    padding-top: var(--filter-spacing-xl);
    border-top: 1px solid var(--filter-border-color);
}

.filter-nav-prev,
.filter-nav-next {
    padding: var(--filter-spacing-md);
    background: var(--filter-bg-card);
    border: 1px solid var(--filter-border-color);
    border-radius: var(--filter-radius);
    transition: all var(--filter-transition);
}

.filter-nav-prev:hover,
.filter-nav-next:hover {
    border-color: var(--filter-accent-cyan);
}

.filter-nav-next {
    text-align: right;
}

.filter-nav-label {
    display: block;
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--filter-text-muted);
    margin-bottom: var(--filter-spacing-xs);
}

.filter-nav-title {
    color: var(--filter-text-primary);
    font-weight: 600;
}

/* Related Posts */
.filter-related-posts {
    margin-top: var(--filter-spacing-2xl);
    padding-top: var(--filter-spacing-xl);
    border-top: 1px solid var(--filter-border-color);
}

.filter-related-title {
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--filter-accent-cyan);
    margin-bottom: var(--filter-spacing-lg);
}

.filter-related-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--filter-spacing-md);
}

/* ==========================================================================
   Comments
   ========================================================================== */

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

.filter-comments-title {
    font-size: 1.25rem;
    margin-bottom: var(--filter-spacing-xl);
    color: var(--filter-accent-cyan);
}

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

.filter-comment {
    padding: var(--filter-spacing-lg);
    background: var(--filter-bg-card);
    border: 1px solid var(--filter-border-color);
    border-radius: var(--filter-radius);
    margin-bottom: var(--filter-spacing-md);
}

.filter-comment-body {
    display: flex;
    gap: var(--filter-spacing-md);
}

.filter-comment-avatar img {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 2px solid var(--filter-accent-purple);
}

.filter-comment-content {
    flex: 1;
}

.filter-comment-author {
    font-weight: 600;
    color: var(--filter-text-primary);
}

.filter-comment-date {
    font-size: 0.75rem;
    color: var(--filter-text-muted);
    margin-bottom: var(--filter-spacing-sm);
}

.filter-comment-text {
    color: var(--filter-text-secondary);
    font-size: 0.9375rem;
}

.filter-comment-reply a {
    font-size: 0.75rem;
    color: var(--filter-accent-cyan);
    text-transform: uppercase;
}

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

.filter-comment-form label {
    display: block;
    margin-bottom: var(--filter-spacing-xs);
    color: var(--filter-text-secondary);
    font-size: 0.875rem;
}

.filter-comment-form input,
.filter-comment-form textarea {
    width: 100%;
    padding: var(--filter-spacing-md);
    background: var(--filter-bg-secondary);
    border: 1px solid var(--filter-border-color);
    border-radius: var(--filter-radius);
    color: var(--filter-text-primary);
    font-size: 1rem;
    margin-bottom: var(--filter-spacing-md);
}

.filter-comment-form input:focus,
.filter-comment-form textarea:focus {
    outline: none;
    border-color: var(--filter-accent-cyan);
    box-shadow: var(--filter-glow-cyan);
}

.filter-comment-form .submit {
    padding: var(--filter-spacing-md) var(--filter-spacing-xl);
    background: var(--filter-accent-cyan);
    color: var(--filter-bg-primary);
    border: none;
    border-radius: var(--filter-radius);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: all var(--filter-transition);
}

.filter-comment-form .submit:hover {
    background: var(--filter-link-hover);
    box-shadow: var(--filter-glow-cyan);
}

/* ==========================================================================
   Archive / Search Pages
   ========================================================================== */

.filter-archive-header {
    background: var(--filter-bg-secondary);
    padding: var(--filter-spacing-2xl) 0;
    margin-bottom: var(--filter-spacing-xl);
    border-bottom: 1px solid var(--filter-border-color);
}

.filter-archive-title {
    font-size: 2rem;
    margin: 0;
}

.filter-archive-title span {
    color: var(--filter-accent-cyan);
}

.filter-archive-description {
    color: var(--filter-text-secondary);
    margin-top: var(--filter-spacing-sm);
}

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

.filter-pagination {
    display: flex;
    justify-content: center;
    gap: var(--filter-spacing-sm);
    margin-top: var(--filter-spacing-2xl);
}

.filter-pagination .page-numbers {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 var(--filter-spacing-sm);
    background: var(--filter-bg-card);
    border: 1px solid var(--filter-border-color);
    border-radius: var(--filter-radius);
    color: var(--filter-text-secondary);
    font-size: 0.875rem;
    transition: all var(--filter-transition);
}

.filter-pagination .page-numbers:hover {
    border-color: var(--filter-accent-cyan);
    color: var(--filter-accent-cyan);
}

.filter-pagination .page-numbers.current {
    background: var(--filter-accent-cyan);
    border-color: var(--filter-accent-cyan);
    color: var(--filter-bg-primary);
}

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

.filter-footer {
    background: var(--filter-bg-secondary);
    border-top: 1px solid var(--filter-border-color);
    padding: 1.5rem 0;
    margin-top: 1.5rem;
}

.filter-footer-inner {
    display: flex;
    flex-direction: column;
    gap: var(--filter-spacing-lg);
    align-items: center;
    text-align: center;
}

.filter-footer-copyright {
    color: var(--filter-text-muted);
    font-size: 0.875rem;
}

.filter-footer-description {
    color: var(--filter-text-muted);
    font-size: 0.75rem;
    opacity: 0.6;
    margin: 0.25rem 0 0;
}

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

.filter-footer-menu a {
    color: var(--filter-text-secondary);
    font-size: 0.875rem;
    transition: color var(--filter-transition);
}

.filter-footer-menu a:hover {
    color: var(--filter-accent-cyan);
}

/* ==========================================================================
   404 Page
   ========================================================================== */

.filter-error-page {
    text-align: center;
    padding: var(--filter-spacing-2xl) var(--filter-spacing-md);
    min-height: 60vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.filter-error-code {
    font-size: 8rem;
    font-family: var(--filter-font-primary);
    font-weight: 700;
    line-height: 1;
    background: linear-gradient(135deg, var(--filter-accent-cyan), var(--filter-accent-magenta));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--filter-spacing-md);
}

.filter-error-title {
    font-size: 1.5rem;
    margin-bottom: var(--filter-spacing-md);
}

.filter-error-message {
    color: var(--filter-text-secondary);
    margin-bottom: var(--filter-spacing-xl);
}

.filter-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--filter-spacing-sm);
    padding: var(--filter-spacing-md) var(--filter-spacing-xl);
    background: var(--filter-accent-cyan);
    color: var(--filter-bg-primary);
    border-radius: var(--filter-radius);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: all var(--filter-transition);
}

.filter-btn:hover {
    background: var(--filter-link-hover);
    color: var(--filter-bg-primary);
    box-shadow: var(--filter-glow-cyan);
    transform: translateY(-2px);
}

/* ==========================================================================
   Breadcrumbs
   ========================================================================== */

.filter-breadcrumbs {
    padding: var(--filter-spacing-md) 0;
    font-size: 0.75rem;
    color: var(--filter-text-muted);
}

.filter-breadcrumbs a {
    color: var(--filter-text-secondary);
}

.filter-breadcrumbs a:hover {
    color: var(--filter-accent-cyan);
}

.filter-breadcrumbs .separator {
    margin: 0 var(--filter-spacing-sm);
    color: var(--filter-text-muted);
}

/* ==========================================================================
   Accessibility
   ========================================================================== */

.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(--filter-bg-secondary);
    border-radius: var(--filter-radius);
    box-shadow: 0 0 2px 2px rgba(0, 0, 0, 0.6);
    clip: auto !important;
    color: var(--filter-accent-cyan);
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    height: auto;
    left: var(--filter-spacing-sm);
    line-height: normal;
    padding: var(--filter-spacing-md);
    text-decoration: none;
    top: var(--filter-spacing-sm);
    width: auto;
    z-index: 100000;
}

.filter-skip-link:focus {
    position: fixed;
    top: var(--filter-spacing-sm);
    left: var(--filter-spacing-sm);
    z-index: 100001;
}

/* Focus styles */
a:focus,
button:focus,
input:focus,
textarea:focus,
select:focus {
    outline: 2px solid var(--filter-accent-cyan);
    outline-offset: 2px;
}

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

@media (min-width: 768px) {
    h1 { font-size: 3rem; }
    h2 { font-size: 2.25rem; }

    .filter-hero-post {
        grid-template-columns: 1fr 1fr;
    }

    .filter-hero-title {
        font-size: 2.5rem;
    }

    .filter-posts-grid.grid-2col,
    .filter-posts-grid.grid-3col {
        grid-template-columns: repeat(2, 1fr);
    }

    .filter-posts-grid.grid-list {
        grid-template-columns: 1fr;
    }

    .filter-related-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .filter-menu-toggle {
        display: none;
    }

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

    .filter-footer-inner {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }
}

@media (min-width: 1024px) {
    .filter-posts-grid.grid-3col {
        grid-template-columns: repeat(3, 1fr);
    }

    .filter-related-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .filter-content-sidebar .filter-sidebar {
        display: block;
    }

    .filter-error-code {
        font-size: 12rem;
    }
}

@media (max-width: 768px) {
    :root {
        --filter-spacing-xl: 1.5rem;
        --filter-spacing-2xl: 2rem;
    }

    .filter-sidebar {
        display: none;
    }

    .filter-container {
        padding: 0 16px;
    }

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

    .filter-post-title {
        font-size: 1.75rem;
    }

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

    .filter-hero-content {
        padding: var(--filter-spacing-sm) 0;
    }

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

    .filter-nav-next {
        text-align: left;
    }

    /* Mobile menu */
    .filter-main-navigation {
        display: block;
        position: absolute;
        top: 100%;
        right: 0;
        width: 280px;
        max-height: calc(100vh - 60px);
        background: var(--filter-bg-secondary);
        border-left: 1px solid var(--filter-border-color);
        padding: var(--filter-spacing-lg);
        transition: transform 0.3s ease;
        z-index: 999;
        overflow-y: auto;
        box-shadow: -4px 0 20px rgba(0,0,0,0.3);
        transform: translateX(100%);
    }

    .filter-nav-open {
        transform: translateX(0);
    }

    .filter-nav-menu {
        flex-direction: column;
        gap: 0;
    }

    .filter-nav-menu a {
        padding: var(--filter-spacing-md) 0;
        border-bottom: 1px solid var(--filter-border-color);
    }

    .filter-nav-menu .sub-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: none;
        padding-left: var(--filter-spacing-md);
        background: transparent;
    }

    .filter-footer-menu {
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--filter-spacing-sm) var(--filter-spacing-md);
    }
}

/* ==========================================================================
   Print Styles
   ========================================================================== */

@media print {
    body {
        background: white;
        color: black;
    }

    .filter-header,
    .filter-footer,
    .filter-sidebar,
    .filter-comments-area,
    .filter-post-navigation,
    .filter-related-posts {
        display: none;
    }

    .filter-post-content {
        font-size: 12pt;
    }

    a {
        color: black;
        text-decoration: underline;
    }
}

/* ==========================================================================
   Structural Diversification — card_style
   ========================================================================== */

/* card_style: horizontal */
body.filter-card-horizontal .filter-posts-grid {
    grid-template-columns: 1fr;
}
body.filter-card-horizontal .filter-post-card {
    display: flex;
    flex-direction: row;
}
body.filter-card-horizontal .filter-card-image {
    width: 40%;
    flex-shrink: 0;
    aspect-ratio: auto;
}
body.filter-card-horizontal .filter-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
body.filter-card-horizontal .filter-card-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
@media (max-width: 768px) {
    body.filter-card-horizontal .filter-post-card {
        flex-direction: column;
    }
    body.filter-card-horizontal .filter-card-image {
        width: 100%;
    }
}

/* card_style: overlay */
body.filter-card-overlay .filter-post-card {
    position: relative;
    min-height: 280px;
    overflow: hidden;
}
body.filter-card-overlay .filter-card-image {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    aspect-ratio: auto;
}
body.filter-card-overlay .filter-card-image img {
    width: 100%; height: 100%; object-fit: cover;
}
body.filter-card-overlay .filter-card-content {
    position: relative; z-index: 1;
    display: flex; flex-direction: column; justify-content: flex-end;
    min-height: 280px; padding: 1.25rem;
    background: linear-gradient(transparent 30%, rgba(0,0,0,0.7) 100%);
}
body.filter-card-overlay .filter-card-title a,
body.filter-card-overlay .filter-card-meta,
body.filter-card-overlay .filter-card-excerpt { color: #fff; }
body.filter-card-overlay .filter-card-category {
    position: static; align-self: flex-start; margin-bottom: 8px;
}

/* card_style: text */
body.filter-card-text .filter-card-image { display: none; }
body.filter-card-text .filter-post-card {
    border-left: 3px solid var(--filter-accent-cyan, #00d4ff);
    padding-left: 1rem;
}

/* ==========================================================================
   Structural Diversification — header_layout
   ========================================================================== */

/* header_layout: centered */
body.filter-header-centered .filter-header-inner {
    flex-direction: column; align-items: center; gap: 0.75rem;
}
body.filter-header-centered .filter-main-navigation { order: 2; }
body.filter-header-centered .filter-header-actions {
    position: absolute; right: 1rem; top: 50%; transform: translateY(-50%);
}
@media (max-width: 768px) {
    body.filter-header-centered .filter-header-inner {
        flex-direction: row; align-items: center;
    }
    body.filter-header-centered .filter-header-actions {
        position: static; transform: none;
    }
}

/* header_layout: stacked */
body.filter-header-stacked .filter-header-inner {
    flex-wrap: wrap; gap: 0;
}
body.filter-header-stacked .filter-site-branding {
    width: 100%; text-align: center; padding: 0.75rem 0 0.5rem;
}
body.filter-header-stacked .filter-main-navigation { flex: 1; justify-content: center; }
@media (max-width: 768px) {
    body.filter-header-stacked .filter-site-branding {
        width: auto; text-align: left; padding: 0;
    }
}

/* ==========================================================================
   Structural Diversification — featured_style
   ========================================================================== */

/* featured_style: hero */
body.filter-featured-hero .filter-hero { display: block; }
body.filter-featured-hero .filter-hero > *:not(:first-child) { display: none; }
body.filter-featured-hero .filter-hero > *:first-child {
    position: relative; min-height: 400px; overflow: hidden;
    border-radius: var(--filter-radius-lg, 12px);
}
body.filter-featured-hero .filter-hero > *:first-child .filter-hero-image {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
}
body.filter-featured-hero .filter-hero > *:first-child .filter-hero-content {
    position: relative; z-index: 1; min-height: 400px;
    display: flex; flex-direction: column; justify-content: flex-end;
    padding: 2rem; background: linear-gradient(transparent 40%, rgba(0,0,0,0.8) 100%);
}
body.filter-featured-hero .filter-hero > *:first-child .filter-hero-title a {
    color: #fff; font-size: 2rem;
}

/* featured_style: none */
body.filter-featured-none .filter-hero { display: none; }

/* ==========================================================================
   Structural Diversification — effect_card_hover
   ========================================================================== */

/* hover: lift */
body.filter-hover-lift .filter-post-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.3);
    border-color: inherit;
}
/* hover: shadow */
body.filter-hover-shadow .filter-post-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.4);
    border-color: inherit;
}
/* hover: border */
body.filter-hover-border .filter-post-card:hover {
    border-color: var(--filter-accent-cyan, #00d4ff);
    transform: none;
    box-shadow: none;
}
/* hover: none */
body.filter-hover-none .filter-post-card:hover {
    transform: none;
    box-shadow: none;
    border-color: inherit;
}