/*
Theme Name: RyoBot Theme
Theme URI: https://ryo-bot.com/
Author: Ryo
Author URI: https://ryo-bot.com/
Description: モダンでミニマルな技術ブログ・ポートフォリオ用WordPressテーマ
Version: 1.1.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: ryobot-theme
*/

/* ========================================
   CSS Variables
======================================== */
:root {
    /* Colors */
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-primary-light: #3b82f6;
    --color-secondary: #64748b;
    --color-accent: #0ea5e9;

    --color-bg: #ffffff;
    --color-bg-secondary: #f8fafc;
    --color-bg-tertiary: #f1f5f9;

    --color-text: #1e293b;
    --color-text-secondary: #475569;
    --color-text-muted: #94a3b8;

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

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Hiragino Sans', 'Noto Sans JP', sans-serif;
    --font-mono: 'Fira Code', 'JetBrains Mono', Consolas, monospace;

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

    /* 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 */
    --max-width: 1200px;
    --content-width: 720px;
    --sidebar-width: 300px;

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
}

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

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

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

/* ========================================
   Typography
======================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-text);
}

h1 { font-size: var(--text-4xl); margin-bottom: var(--spacing-lg); }
h2 { font-size: var(--text-3xl); margin-bottom: var(--spacing-md); }
h3 { font-size: var(--text-2xl); margin-bottom: var(--spacing-md); }
h4 { font-size: var(--text-xl); margin-bottom: var(--spacing-sm); }
h5 { font-size: var(--text-lg); margin-bottom: var(--spacing-sm); }
h6 { font-size: var(--text-base); margin-bottom: var(--spacing-sm); }

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

/* ========================================
   Layout
======================================== */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.content-wrapper {
    max-width: var(--content-width);
    margin: 0 auto;
}

/* ========================================
   Header
======================================== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
}

/* Header with Background Image */
.site-header.has-bg-image {
    position: relative !important;
    background-color: #ffffff !important;
    overflow: hidden !important;
}

.site-header.has-bg-image::before {
    content: '' !important;
    display: block !important;
    position: absolute !important;
    top: 0 !important;
    left: 0 !important;
    right: 0 !important;
    bottom: 0 !important;
    width: 100% !important;
    height: 100% !important;
    background-image: var(--header-bg-image) !important;
    background-size: contain !important;
    background-repeat: no-repeat !important;
    background-position: var(--header-bg-position, center) !important;
    opacity: var(--header-bg-opacity, 0.15) !important;
    pointer-events: none !important;
    z-index: 0 !important;
}

.site-header.has-bg-image > .container {
    position: relative !important;
    z-index: 1 !important;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

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

.site-logo {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
}

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

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

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

/* Navigation */
.main-navigation {
    display: flex;
    align-items: center;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-sm);
}

.nav-menu li a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-secondary);
    font-weight: 500;
    font-size: var(--text-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-menu li a:hover,
.nav-menu li.current-menu-item a {
    color: var(--color-primary);
    background-color: var(--color-bg-secondary);
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    padding: var(--spacing-sm);
    cursor: pointer;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    margin: 5px 0;
    transition: var(--transition-fast);
}

@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }

    .main-navigation {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        display: none;
    }

    .main-navigation.is-open {
        display: block;
    }

    .nav-menu {
        flex-direction: column;
        padding: var(--spacing-md);
        gap: 0;
    }

    .nav-menu li a {
        padding: var(--spacing-md);
    }
}

/* ========================================
   Hero Section
======================================== */
.hero {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg) 100%);
}

.hero-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.hero-title {
    font-size: clamp(var(--text-3xl), 5vw, var(--text-4xl));
    margin-bottom: var(--spacing-md);
}

.hero-description {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
}

/* ========================================
   Main Content
======================================== */
.site-main {
    padding: var(--spacing-3xl) 0;
    min-height: 60vh;
}

/* ========================================
   Blog Posts
======================================== */
.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--spacing-xl);
}

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

.post-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.post-card-thumbnail {
    aspect-ratio: 16/9;
    overflow: hidden;
    background: var(--color-bg-tertiary);
}

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

.post-card:hover .post-card-thumbnail img {
    transform: scale(1.05);
}

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

.post-card-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.post-card-category {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-primary);
    color: white;
    font-size: var(--text-xs);
    font-weight: 600;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.post-card-title {
    font-size: var(--text-xl);
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

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

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

.post-card-excerpt {
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    line-height: 1.6;
}

/* ========================================
   Single Post
======================================== */
.single-post-header {
    text-align: center;
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    background: var(--color-bg-secondary);
}

.single-post-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.single-post-title {
    font-size: clamp(var(--text-2xl), 4vw, var(--text-4xl));
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
}

.single-post-thumbnail {
    max-width: 900px;
    margin: 0 auto;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.single-post-content {
    padding: var(--spacing-3xl) 0;
}

/* Article Content Styling */
.article-content {
    font-size: var(--text-lg);
    line-height: 1.8;
}

.article-content h2 {
    margin-top: var(--spacing-3xl);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-border);
}

.article-content h3 {
    margin-top: var(--spacing-2xl);
}

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

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

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

.article-content blockquote {
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-lg) var(--spacing-xl);
    background: var(--color-bg-secondary);
    border-left: 4px solid var(--color-primary);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.article-content pre {
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-lg);
    background: #1e293b;
    color: #e2e8f0;
    border-radius: var(--radius-md);
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    line-height: 1.6;
}

.article-content code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    padding: 0.2em 0.4em;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-sm);
}

.article-content pre code {
    padding: 0;
    background: none;
}

.article-content img {
    margin: var(--spacing-xl) auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

.article-content a {
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* ========================================
   Portfolio
======================================== */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.portfolio-item {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
}

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

.portfolio-thumbnail {
    aspect-ratio: 16/10;
    overflow: hidden;
    background: var(--color-bg-tertiary);
}

.portfolio-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

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

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

.portfolio-description {
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    margin-bottom: var(--spacing-md);
}

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

.portfolio-tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-bg-tertiary);
    color: var(--color-text-secondary);
    font-size: var(--text-xs);
    border-radius: var(--radius-sm);
}

/* ========================================
   Links Page
======================================== */
.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.link-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.link-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.link-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    font-size: var(--text-2xl);
    flex-shrink: 0;
}

.link-info {
    flex: 1;
    min-width: 0;
}

.link-title {
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.link-description {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ========================================
   Contact Form
======================================== */
.contact-section {
    max-width: 600px;
    margin: 0 auto;
}

.contact-form .form-group {
    margin-bottom: var(--spacing-lg);
}

.contact-form label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: var(--text-base);
    transition: border-color var(--transition-fast);
}

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

.contact-form textarea {
    min-height: 180px;
    resize: vertical;
}

.contact-form .submit-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--color-primary);
    color: white;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

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

/* Contact Form 7 Styling */
.wpcf7-form input[type="text"],
.wpcf7-form input[type="email"],
.wpcf7-form textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: var(--text-base);
    transition: border-color var(--transition-fast);
}

.wpcf7-form input:focus,
.wpcf7-form textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.wpcf7-form input[type="submit"] {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--color-primary);
    color: white;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.wpcf7-form input[type="submit"]:hover {
    background: var(--color-primary-dark);
}

.wpcf7-form p {
    margin-bottom: var(--spacing-lg);
}

/* ========================================
   Page Header
======================================== */
.page-header {
    padding: var(--spacing-3xl) 0 var(--spacing-2xl);
    background: var(--color-bg-secondary);
    text-align: center;
}

.page-title {
    font-size: var(--text-4xl);
    margin-bottom: var(--spacing-sm);
}

.page-description {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   Footer
======================================== */
.site-footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-inner {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h4 {
    font-size: var(--text-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

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

.footer-section li {
    margin-bottom: var(--spacing-sm);
}

.footer-section a {
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
}

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

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

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-bg);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.footer-social a:hover {
    background: var(--color-primary);
    color: white;
}

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

/* ========================================
   Buttons
======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-weight: 500;
    font-size: var(--text-sm);
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

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

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

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

.btn-secondary:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text);
}

/* ========================================
   Pagination
======================================== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-3xl);
}

.pagination a,
.pagination span {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 var(--spacing-md);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

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

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

/* ========================================
   Sidebar & Widgets
======================================== */
.sidebar {
    padding: var(--spacing-xl);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
}

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

.widget:last-child {
    margin-bottom: 0;
}

.widget-title {
    font-size: var(--text-base);
    font-weight: 600;
    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;
}

/* ========================================
   Utility Classes
======================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }
.mt-5 { margin-top: var(--spacing-2xl); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }
.mb-5 { margin-bottom: var(--spacing-2xl); }

.section-title {
    font-size: var(--text-2xl);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

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

.error-404 h1 {
    font-size: 6rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.error-404 p {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
}

/* ========================================
   Responsive
======================================== */
@media (max-width: 1024px) {
    :root {
        --spacing-3xl: 3rem;
    }

    .posts-grid,
    .portfolio-grid {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-3xl: 2.5rem;
        --spacing-2xl: 2rem;
    }

    .hero-title {
        font-size: var(--text-3xl);
    }

    .posts-grid,
    .portfolio-grid,
    .links-grid {
        grid-template-columns: 1fr;
    }

    .footer-inner {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-social {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .article-content {
        font-size: var(--text-base);
    }
}

/* ========================================
   Additional Styles
======================================== */

/* Breadcrumbs */
.breadcrumbs {
    margin-bottom: var(--spacing-xl);
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.breadcrumbs ol {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    gap: var(--spacing-xs);
}

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

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

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

/* Post Tags */
.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.post-tags .tags-label {
    font-weight: 500;
    color: var(--color-text-secondary);
}

.post-tags .tag {
    color: var(--color-primary);
    font-size: var(--text-sm);
}

.post-tags .tag:hover {
    text-decoration: underline;
}

/* Post Navigation */
.post-navigation {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-3xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.post-navigation a {
    display: block;
    padding: var(--spacing-lg);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.post-navigation a:hover {
    background: var(--color-bg-tertiary);
}

.post-navigation .nav-prev {
    text-align: left;
}

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

.post-navigation .nav-label {
    display: block;
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xs);
}

.post-navigation .nav-title {
    font-weight: 500;
    color: var(--color-text);
}

@media (max-width: 640px) {
    .post-navigation {
        grid-template-columns: 1fr;
    }
}

/* Comments */
.comments-area {
    margin-top: var(--spacing-3xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

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

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

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

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

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

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

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

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

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

.comment-content {
    font-size: var(--text-base);
}

.reply a {
    font-size: var(--text-sm);
    font-weight: 500;
}

/* Search Form */
.search-form {
    display: flex;
    gap: var(--spacing-sm);
    max-width: 400px;
}

.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(--text-base);
}

.search-field:focus {
    outline: none;
    border-color: var(--color-primary);
}

.search-submit {
    padding: var(--spacing-sm) var(--spacing-md);
}

/* Table of Contents */
.table-of-contents {
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-lg);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
}

.table-of-contents h4 {
    font-size: var(--text-base);
    margin-bottom: var(--spacing-md);
}

.table-of-contents ol {
    list-style: decimal;
    padding-left: var(--spacing-lg);
}

.table-of-contents li {
    margin-bottom: var(--spacing-xs);
}

.table-of-contents li.h3 {
    margin-left: var(--spacing-lg);
}

.table-of-contents a {
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
}

.table-of-contents a:hover {
    color: var(--color-primary);
}

/* Code Block Wrapper */
.code-block-wrapper {
    position: relative;
    margin: var(--spacing-xl) 0;
}

.copy-code-btn {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-sm);
    color: #e2e8f0;
    font-size: var(--text-xs);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.copy-code-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.copy-code-btn.copied {
    background: var(--color-primary);
    border-color: var(--color-primary);
}

/* Portfolio Links */
.portfolio-links {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--text-sm);
}

/* Portfolio Thumbnail Placeholder */
.post-card-thumbnail-placeholder,
.portfolio-thumbnail-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg-tertiary) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Hero Buttons */
.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* Screen Reader Text */
.screen-reader-text {
    border: 0;
    clip: rect(1px, 1px, 1px, 1px);
    clip-path: inset(50%);
    height: 1px;
    margin: -1px;
    overflow: hidden;
    padding: 0;
    position: absolute;
    width: 1px;
    word-wrap: normal !important;
}

.screen-reader-text:focus {
    background-color: var(--color-bg);
    clip: auto !important;
    clip-path: none;
    color: var(--color-text);
    display: block;
    font-size: var(--text-sm);
    font-weight: 600;
    height: auto;
    left: 5px;
    line-height: normal;
    padding: 15px 23px 14px;
    text-decoration: none;
    top: 5px;
    width: auto;
    z-index: 100000;
}

/* Skip Link */
.skip-link {
    left: -9999rem;
    top: 2.5rem;
}

.skip-link:focus {
    display: block;
    left: 6px;
    top: 7px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    line-height: normal;
    padding: 15px 23px 14px;
    z-index: 100000;
    background: var(--color-bg);
    color: var(--color-primary);
    box-shadow: var(--shadow-lg);
}

/* Keyboard Navigation Focus */
body.keyboard-nav *:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* No Posts Message */
.no-posts,
.no-links-message {
    padding: var(--spacing-3xl);
    text-align: center;
    color: var(--color-text-secondary);
}

/* Footer About */
.footer-about {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* Header Scrolled State */
.site-header.scrolled {
    box-shadow: var(--shadow-sm);
}

/* Reading Time */
.reading-time {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.reading-time::before {
    content: '';
    width: 4px;
    height: 4px;
    background: var(--color-text-muted);
    border-radius: var(--radius-full);
}

/* ========================================
   Post Card Overlay Style
======================================== */
.post-card-overlay {
    position: relative;
    border: none;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

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

.post-card-overlay .post-card-background {
    position: relative;
    aspect-ratio: 16/9;
    background-color: var(--color-primary);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    display: flex;
    align-items: flex-end;
}

/* Gradient overlay for readability */
.post-card-overlay .post-card-background::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        to top,
        rgba(0, 0, 0, 0.85) 0%,
        rgba(0, 0, 0, 0.5) 40%,
        rgba(0, 0, 0, 0.2) 70%,
        rgba(0, 0, 0, 0.1) 100%
    );
    transition: background var(--transition-normal);
}

.post-card-overlay:hover .post-card-background::before {
    background: linear-gradient(
        to top,
        rgba(0, 0, 0, 0.9) 0%,
        rgba(0, 0, 0, 0.6) 40%,
        rgba(0, 0, 0, 0.3) 70%,
        rgba(0, 0, 0, 0.2) 100%
    );
}

/* Default pattern for cards without thumbnail */
.post-card-overlay .post-card-background:not([style*="background-image"]) {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 50%, #1e40af 100%);
}

.post-card-overlay .post-card-background:not([style*="background-image"])::before {
    background: linear-gradient(
        to top,
        rgba(0, 0, 0, 0.4) 0%,
        rgba(0, 0, 0, 0.1) 50%,
        transparent 100%
    );
}

/* Decorative pattern for no-thumbnail cards */
.post-card-overlay .post-card-background:not([style*="background-image"])::after {
    content: '';
    position: absolute;
    inset: 0;
    opacity: 0.1;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(255,255,255,0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(255,255,255,0.2) 0%, transparent 40%),
        linear-gradient(45deg, transparent 40%, rgba(255,255,255,0.05) 50%, transparent 60%);
}

.post-card-overlay .post-card-overlay-content {
    position: relative;
    z-index: 1;
    padding: var(--spacing-lg);
    width: 100%;
    color: white;
}

.post-card-overlay .post-card-category {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(4px);
    color: white;
    font-size: var(--text-xs);
    font-weight: 600;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
}

.post-card-overlay .post-card-title {
    font-size: var(--text-xl);
    font-weight: 700;
    line-height: 1.4;
    margin: 0 0 var(--spacing-sm) 0;
    color: white;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.post-card-overlay .post-card-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: var(--text-sm);
    color: rgba(255, 255, 255, 0.8);
}

.post-card-overlay .post-card-meta time {
    color: rgba(255, 255, 255, 0.8);
}

/* Hover effect */
.post-card-overlay {
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.post-card-overlay:hover .post-card-title {
    text-decoration: underline;
    text-underline-offset: 3px;
}

/* Responsive */
@media (max-width: 768px) {
    .post-card-overlay .post-card-background {
        aspect-ratio: 16/9;
    }

    .post-card-overlay .post-card-title {
        font-size: var(--text-lg);
    }

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

/* ========================================
   Blog Filter & Sort Controls
======================================== */
.blog-controls {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-xl);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.blog-filter {
    flex: 1;
    min-width: 280px;
}

.filter-title {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.category-checkboxes {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.category-checkbox {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    cursor: pointer;
    font-size: var(--text-sm);
    transition: all var(--transition-fast);
    user-select: none;
}

.category-checkbox:hover {
    border-color: var(--color-primary);
}

.category-checkbox input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--color-primary);
    cursor: pointer;
}

.category-checkbox input[type="checkbox"]:checked + .checkbox-label {
    color: var(--color-primary);
    font-weight: 500;
}

.category-checkbox:has(input:checked) {
    background: rgba(37, 99, 235, 0.1);
    border-color: var(--color-primary);
}

.checkbox-label {
    color: var(--color-text);
}

.checkbox-count {
    color: var(--color-text-muted);
    font-size: var(--text-xs);
}

.blog-sort {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    min-width: 250px;
}

.sort-label {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    white-space: nowrap;
}

.sort-select {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    padding-right: var(--spacing-xl);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg);
    font-size: var(--text-sm);
    font-family: var(--font-sans);
    color: var(--color-text);
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23475569' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
}

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

/* Post Views in Card */
.post-views {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.post-views::before {
    content: '';
    width: 4px;
    height: 4px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: var(--radius-full);
}

/* Responsive */
@media (max-width: 768px) {
    .blog-controls {
        flex-direction: column;
        gap: var(--spacing-lg);
    }

    .blog-filter,
    .blog-sort {
        min-width: 100%;
    }

    .blog-sort {
        flex-direction: column;
        align-items: flex-start;
    }

    .sort-select {
        width: 100%;
    }
}