/* ========================================
   Lumina Theme - Core Stylesheet
   Version: 1.0.0
   ======================================== */

/* === CSS Variables / Design Tokens === */
:root {
    /* Colors - Light Mode */
    --color-bg: #FFFFFF;
    --color-bg-secondary: #F7F8FA;
    --color-bg-card: #FFFFFF;
    --color-bg-overlay: rgba(0, 0, 0, 0.5);
    --color-text-primary: #1A1A1A;
    --color-text-body: #4A4A4A;
    --color-text-secondary: #8C8C8C;
    --color-text-placeholder: #B0B0B0;
    --color-brand: #0052D9;
    --color-brand-hover: #0041B3;
    --color-brand-light: rgba(0, 82, 217, 0.1);
    --color-border: #E8E8E8;
    --color-border-light: #F0F0F0;
    --color-shadow: rgba(0, 0, 0, 0.06);
    --color-success: #52C41A;
    --color-warning: #FAAD14;
    --color-error: #FF4D4F;
    --color-code-bg: #F4F4F5;
    --color-blockquote-border: #0052D9;
    --color-blockquote-bg: #F7F8FA;
    --color-table-border: #E8E8E8;
    --color-table-header-bg: #F7F8FA;
    --color-table-stripe: #FAFAFA;
    --color-scrollbar-thumb: #C0C0C0;
    --color-scrollbar-track: transparent;

    /* Typography */
    --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif;
    --font-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;
    --line-height-body: 1.75;
    --line-height-heading: 1.3;

    /* 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-width: 1200px;
    --sidebar-width: 300px;
    --header-height: 64px;
    --border-radius-sm: 4px;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --border-radius-full: 9999px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
    --transition-slow: 0.4s ease;

    /* Shadows */
    --shadow-sm: 0 1px 2px var(--color-shadow);
    --shadow-md: 0 4px 12px var(--color-shadow);
    --shadow-lg: 0 8px 24px var(--color-shadow);

    /* Z-index */
    --z-header: 100;
    --z-overlay: 200;
    --z-modal: 300;
    --z-toast: 400;
}

/* === Dark Mode === */
html.dark-mode {
    --color-bg: #121212;
    --color-bg-secondary: #1E1E1E;
    --color-bg-card: #1E1E1E;
    --color-bg-overlay: rgba(0, 0, 0, 0.7);
    --color-text-primary: #E0E0E0;
    --color-text-body: #B0B0B0;
    --color-text-secondary: #888888;
    --color-text-placeholder: #666666;
    --color-brand: #4D94FF;
    --color-brand-hover: #6BA5FF;
    --color-brand-light: rgba(77, 148, 255, 0.15);
    --color-border: #2E2E2E;
    --color-border-light: #252525;
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-code-bg: #252525;
    --color-blockquote-border: #4D94FF;
    --color-blockquote-bg: #1E1E1E;
    --color-table-border: #2E2E2E;
    --color-table-header-bg: #252525;
    --color-table-stripe: #1A1A1A;
    --color-scrollbar-thumb: #444;
}

/* === Auto Mode (respects system preference) === */
@media (prefers-color-scheme: dark) {
    html.auto-mode {
        --color-bg: #121212;
        --color-bg-secondary: #1E1E1E;
        --color-bg-card: #1E1E1E;
        --color-bg-overlay: rgba(0, 0, 0, 0.7);
        --color-text-primary: #E0E0E0;
        --color-text-body: #B0B0B0;
        --color-text-secondary: #888888;
        --color-text-placeholder: #666666;
        --color-brand: #4D94FF;
        --color-brand-hover: #6BA5FF;
        --color-brand-light: rgba(77, 148, 255, 0.15);
        --color-border: #2E2E2E;
        --color-border-light: #252525;
        --color-shadow: rgba(0, 0, 0, 0.3);
        --color-code-bg: #252525;
        --color-blockquote-border: #4D94FF;
        --color-blockquote-bg: #1E1E1E;
        --color-table-border: #2E2E2E;
        --color-table-header-bg: #252525;
        --color-table-stripe: #1A1A1A;
        --color-scrollbar-thumb: #444;
    }
}

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

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

body {
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    line-height: var(--line-height-body);
    color: var(--color-text-body);
    background-color: var(--color-bg);
    transition: background-color var(--transition-slow), color var(--transition-slow);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

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

img {
    max-width: 100%;
    height: auto;
    vertical-align: middle;
}

svg {
    flex-shrink: 0;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: var(--color-scrollbar-track);
}
::-webkit-scrollbar-thumb {
    background: var(--color-scrollbar-thumb);
    border-radius: var(--border-radius-full);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-secondary);
}

/* Selection */
::selection {
    background: var(--color-brand-light);
    color: var(--color-brand);
}

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

/* === Reading Progress Bar === */
.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: var(--color-brand);
    z-index: calc(var(--z-header) + 10);
    width: 0;
    transition: width 0.1s linear;
}

/* ========================================
   HEADER
   ======================================== */
.site-header {
    position: sticky;
    top: 0;
    z-index: var(--z-header);
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border-light);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    background-color: rgba(255, 255, 255, 0.85);
    transition: background-color var(--transition-slow), border-color var(--transition-slow);
}

html.dark-mode .site-header,
html.auto-mode .site-header {
    background-color: rgba(18, 18, 18, 0.85);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.site-branding .site-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-primary);
    font-size: var(--font-size-xl);
    font-weight: 700;
    text-decoration: none;
}

.site-branding .logo-img {
    max-height: 36px;
    width: auto;
}

.site-branding .logo-text {
    white-space: nowrap;
}

/* Navigation */
.site-nav .nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xs);
}

.site-nav .nav-menu a {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-body);
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: var(--border-radius);
    transition: color var(--transition-fast), background var(--transition-fast);
}

.site-nav .nav-menu a:hover,
.site-nav .nav-menu .current a {
    color: var(--color-brand);
    background: var(--color-brand-light);
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--border-radius);
    background: transparent;
    color: var(--color-text-body);
    cursor: pointer;
    transition: color var(--transition-fast), background var(--transition-fast);
}

.btn-icon:hover {
    color: var(--color-brand);
    background: var(--color-brand-light);
}

/* Theme Toggle */
.theme-toggle .icon-sun { display: block; }
.theme-toggle .icon-moon { display: none; }
html.dark-mode .theme-toggle .icon-sun { display: none; }
html.dark-mode .theme-toggle .icon-moon { display: block; }

@media (prefers-color-scheme: dark) {
    html.auto-mode .theme-toggle .icon-sun { display: none; }
    html.auto-mode .theme-toggle .icon-moon { display: block; }
}

/* Menu Toggle (Mobile) */
.menu-toggle { display: none; }

/* ========================================
   SEARCH OVERLAY
   ======================================== */
.search-overlay {
    position: fixed;
    inset: 0;
    z-index: var(--z-overlay);
    background: var(--color-bg-overlay);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 15vh;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

.search-overlay.active {
    opacity: 1;
    visibility: visible;
}

.search-container {
    width: 100%;
    max-width: 600px;
    padding: 0 var(--spacing-lg);
    position: relative;
}

.search-form {
    display: flex;
    align-items: center;
    background: var(--color-bg);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    transition: border-color var(--transition-fast);
}

.search-form:focus-within {
    border-color: var(--color-brand);
}

.search-input {
    flex: 1;
    border: none;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-lg);
    background: transparent;
    color: var(--color-text-primary);
    outline: none;
}

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

.search-submit {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    border: none;
    background: transparent;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: color var(--transition-fast);
}

.search-submit:hover {
    color: var(--color-brand);
}

.search-close {
    position: absolute;
    top: -60px;
    right: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--border-radius-full);
    color: white;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.search-close:hover {
    background: rgba(255, 255, 255, 0.3);
}

.search-results {
    margin-top: var(--spacing-md);
    max-height: 50vh;
    overflow-y: auto;
}

/* ========================================
   MAIN CONTENT LAYOUT
   ======================================== */
.site-main {
    padding-top: var(--spacing-xl);
    padding-bottom: var(--spacing-3xl);
    min-height: calc(100vh - var(--header-height) - 200px);
}

.content-area {
    display: flex;
    gap: var(--spacing-2xl);
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.content-area.full-width .primary-content {
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

/* With Sidebar Layout */
.content-area.with-sidebar .primary-content {
    flex: 1;
    min-width: 0;
}

.content-area.sidebar-left {
    flex-direction: row-reverse;
}

.content-area.sidebar-right {
    flex-direction: row;
}

/* ========================================
   POST CARD
   ======================================== */
.post-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

/* Card Layout */
.post-list.layout-card .post-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.post-list.layout-card .post-thumb {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
    background: var(--color-bg-secondary);
}

.post-list.layout-card .post-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.post-list.layout-card .post-card:hover .post-thumb img {
    transform: scale(1.03);
}

.post-category {
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-md);
    padding: 4px 12px;
    background: var(--color-brand);
    color: #fff;
    font-size: var(--font-size-xs);
    font-weight: 600;
    border-radius: var(--border-radius-full);
    text-decoration: none;
    z-index: 1;
}

.post-category:hover {
    color: #fff;
    background: var(--color-brand-hover);
}

.post-list.layout-card .post-body {
    padding: var(--spacing-lg) var(--spacing-xl);
}

/* List Layout */
.post-list.layout-list .post-card {
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg) 0;
    border-bottom: 1px solid var(--color-border-light);
}

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

.post-list.layout-list .post-body {
    flex: 1;
}

/* Post Title */
.post-title {
    font-size: var(--font-size-2xl);
    line-height: var(--line-height-heading);
    margin-bottom: var(--spacing-sm);
}

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

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

/* Post Excerpt */
.post-excerpt {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Post Meta */
.post-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
}

.meta-item {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

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

.meta-item a:hover {
    color: var(--color-brand);
}

/* ========================================
   SIDEBAR
   ======================================== */
.sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

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

.widget-title {
    font-size: var(--font-size-base);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-brand);
}

/* Search Widget */
.sidebar-search-form {
    display: flex;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: border-color var(--transition-fast);
}

.sidebar-search-form:focus-within {
    border-color: var(--color-brand);
}

.sidebar-search-input {
    flex: 1;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    outline: none;
}

.sidebar-search-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    border: none;
    background: transparent;
    color: var(--color-text-secondary);
    cursor: pointer;
}

/* Recent Posts Widget */
.recent-posts-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.recent-posts-list li a {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
    color: var(--color-text-body);
}

.recent-posts-list li a:hover {
    color: var(--color-brand);
}

.recent-post-thumb {
    width: 60px;
    height: 45px;
    border-radius: var(--border-radius-sm);
    overflow: hidden;
    flex-shrink: 0;
    background: var(--color-bg-secondary);
}

.recent-post-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.recent-post-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.recent-post-title {
    font-size: var(--font-size-sm);
    font-weight: 500;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.recent-post-date {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
}

/* Categories Widget */
.categories-list {
    list-style: none;
}

.categories-list li a {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    color: var(--color-text-body);
    font-size: var(--font-size-sm);
    border-bottom: 1px solid var(--color-border-light);
}

.categories-list li:last-child a {
    border-bottom: none;
}

.categories-list li a:hover {
    color: var(--color-brand);
}

.cat-count {
    background: var(--color-bg-secondary);
    color: var(--color-text-secondary);
    font-size: var(--font-size-xs);
    padding: 2px 8px;
    border-radius: var(--border-radius-full);
}

/* Tag Cloud */
.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.tag-cloud-item {
    display: inline-block;
    padding: 4px 12px;
    background: var(--color-bg-secondary);
    color: var(--color-text-body) !important;
    border-radius: var(--border-radius-full);
    font-size: var(--font-size-xs);
    transition: background var(--transition-fast), color var(--transition-fast);
}

.tag-cloud-item:hover {
    background: var(--color-brand);
    color: #fff !important;
}

/* Archives Widget */
.archives-list {
    list-style: none;
}

.archives-list li a {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
    color: var(--color-text-body);
    font-size: var(--font-size-sm);
    border-bottom: 1px solid var(--color-border-light);
}

.archives-list li:last-child a {
    border-bottom: none;
}

.archive-count {
    color: var(--color-text-secondary);
    font-size: var(--font-size-xs);
}

/* ========================================
   PAGINATION
   ======================================== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-2xl);
    flex-wrap: wrap;
}

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

.pagination a:hover {
    border-color: var(--color-brand);
    color: var(--color-brand);
    background: var(--color-brand-light);
}

.pagination .current {
    background: var(--color-brand);
    border-color: var(--color-brand);
    color: #fff;
    font-weight: 600;
}

.pagination .prev,
.pagination .next {
    padding: 0 var(--spacing-md);
}

/* ========================================
   SINGLE POST
   ======================================== */
.post-single-area .primary-content {
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

/* Breadcrumb */
.breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

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

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

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

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

/* Post Header */
.post-header {
    margin-bottom: var(--spacing-xl);
}

.post-title-single {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    line-height: var(--line-height-heading);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

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

.post-meta-single .meta-author {
    display: flex;
    align-items: center;
    gap: 4px;
    font-weight: 500;
    color: var(--color-text-body);
}

.post-meta-single .meta-divider {
    color: var(--color-text-placeholder);
}

.post-meta-single .meta-category {
    color: var(--color-brand);
    font-weight: 500;
}

/* Post Content */
.post-content {
    font-size: var(--font-size-lg);
    line-height: var(--line-height-body);
    color: var(--color-text-body);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.post-content h1, .post-content h2, .post-content h3,
.post-content h4, .post-content h5, .post-content h6 {
    color: var(--color-text-primary);
    font-weight: 700;
    line-height: var(--line-height-heading);
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-md);
}

.post-content h1 { font-size: 2em; }
.post-content h2 { font-size: 1.75em; }
.post-content h3 { font-size: 1.5em; }
.post-content h4 { font-size: 1.25em; }
.post-content h5 { font-size: 1.1em; }
.post-content h6 { font-size: 1em; }

.post-content h2 {
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-border-light);
}

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

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

.post-content strong { color: var(--color-text-primary); font-weight: 600; }

/* Blockquote */
.post-content blockquote {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-md) var(--spacing-lg);
    border-left: 4px solid var(--color-blockquote-border);
    background: var(--color-blockquote-bg);
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    color: var(--color-text-secondary);
}

.post-content blockquote p:last-child {
    margin-bottom: 0;
}

/* Code */
.post-content code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background: var(--color-code-bg);
    padding: 2px 6px;
    border-radius: var(--border-radius-sm);
    color: var(--color-error);
}

.post-content pre {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-lg);
    background: var(--color-code-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    overflow-x: auto;
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.post-content pre code {
    background: none;
    padding: 0;
    color: var(--color-text-body);
    font-size: inherit;
}

/* Table */
.post-content table {
    width: 100%;
    margin: var(--spacing-lg) 0;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
}

.post-content th,
.post-content td {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-table-border);
    text-align: left;
}

.post-content th {
    background: var(--color-table-header-bg);
    font-weight: 600;
    color: var(--color-text-primary);
}

.post-content tr:nth-child(even) td {
    background: var(--color-table-stripe);
}

/* List */
.post-content ul,
.post-content ol {
    margin: var(--spacing-md) 0;
    padding-left: 1.5em;
}

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

.post-content li > ul,
.post-content li > ol {
    margin-top: var(--spacing-xs);
}

/* Image */
.post-content img {
    border-radius: var(--border-radius);
    margin: var(--spacing-lg) auto;
    display: block;
    max-width: 100%;
    height: auto;
}

/* Horizontal Rule */
.post-content hr {
    margin: var(--spacing-2xl) 0;
    border: none;
    height: 1px;
    background: var(--color-border);
}

/* ========================================
   TOC (Table of Contents)
   ======================================== */
.toc-container {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius);
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.toc-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    user-select: none;
}

.toc-title {
    font-size: var(--font-size-base);
    font-weight: 700;
    color: var(--color-text-primary);
}

.toc-header svg {
    transition: transform var(--transition-base);
}

.toc-container.collapsed .toc-header svg {
    transform: rotate(-90deg);
}

.toc-nav {
    margin-top: var(--spacing-md);
    list-style: none;
    padding-left: 0;
}

.toc-container.collapsed .toc-nav {
    display: none;
}

.toc-nav a {
    display: block;
    padding: 4px 0;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    border-left: 2px solid transparent;
    padding-left: var(--spacing-md);
    transition: color var(--transition-fast), border-color var(--transition-fast);
}

.toc-nav a:hover,
.toc-nav a.active {
    color: var(--color-brand);
    border-left-color: var(--color-brand);
}

.toc-nav a.toc-h3 { padding-left: calc(var(--spacing-md) + 16px); }
.toc-nav a.toc-h4 { padding-left: calc(var(--spacing-md) + 32px); }

/* ========================================
   POST FOOTER
   ======================================== */
.post-footer {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border-light);
}

/* Tags */
.post-tags {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-secondary);
}

.tag-item {
    display: inline-block;
    padding: 4px 12px;
    background: var(--color-bg-secondary);
    color: var(--color-text-body) !important;
    border-radius: var(--border-radius-full);
    font-size: var(--font-size-xs);
    transition: background var(--transition-fast), color var(--transition-fast);
}

.tag-item:hover {
    background: var(--color-brand);
    color: #fff !important;
}

/* Copyright */
.post-copyright {
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-sm);
    line-height: 1.8;
}

.post-copyright p {
    margin-bottom: var(--spacing-xs);
}

.post-copyright p:last-child {
    margin-bottom: 0;
}

/* Post Navigation */
.post-navigation {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-md);
}

.post-navigation .nav-prev,
.post-navigation .nav-next {
    flex: 1;
}

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

.post-navigation a {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    padding: var(--spacing-sm) 0;
}

.post-navigation a:hover {
    color: var(--color-brand);
}

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

.comment-reply-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-lg);
}

.comment-reply-title small {
    font-weight: 400;
    font-size: var(--font-size-sm);
    margin-left: var(--spacing-sm);
}

.comment-form-fields {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

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

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    border: 0;
}

.form-input,
.form-textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    background: var(--color-bg);
    color: var(--color-text-primary);
    font-family: var(--font-sans);
    font-size: var(--font-size-sm);
    transition: border-color var(--transition-fast);
    outline: none;
}

.form-input:focus,
.form-textarea:focus {
    border-color: var(--color-brand);
    box-shadow: 0 0 0 3px var(--color-brand-light);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius);
    font-family: var(--font-sans);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-primary {
    background: var(--color-brand);
    color: #fff;
}

.btn-primary:hover {
    background: var(--color-brand-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
    border-color: var(--color-brand);
    color: var(--color-brand);
}

/* Comment List */
.comment-list {
    list-style: none;
    margin-top: var(--spacing-xl);
}

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

.comment-body {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-bg-secondary);
    border-radius: var(--border-radius);
}

.comment-avatar img {
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius-full);
    flex-shrink: 0;
}

.comment-content {
    flex: 1;
    min-width: 0;
}

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

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

.badge-author {
    display: inline-block;
    padding: 1px 8px;
    background: var(--color-brand);
    color: #fff;
    font-size: var(--font-size-xs);
    border-radius: var(--border-radius-sm);
    margin-left: 4px;
}

.comment-time {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
}

.comment-reply a {
    font-size: var(--font-size-xs);
    color: var(--color-brand);
}

.comment-text {
    font-size: var(--font-size-sm);
    line-height: 1.7;
    word-wrap: break-word;
}

.comment-children {
    list-style: none;
    margin-left: var(--spacing-2xl);
    margin-top: var(--spacing-md);
}

.comment-logged-in {
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.comment-loading {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.spin {
    animation: spin 1s linear infinite;
}

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

/* Comments Pagination */
.comment-pagination {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-lg);
}

.comment-pagination a,
.comment-pagination span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 32px;
    height: 32px;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-xs);
    color: var(--color-text-body);
}

.comment-pagination .current {
    background: var(--color-brand);
    border-color: var(--color-brand);
    color: #fff;
}

.comments-closed {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-text-secondary);
}

/* ========================================
   SEARCH RESULTS
   ======================================== */
.search-highlight {
    background: #FFF3B0;
    color: #1A1A1A;
    padding: 1px 3px;
    border-radius: 2px;
}

.search-keyword {
    color: var(--color-brand);
    font-weight: 700;
}

.search-count {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.search-result-card {
    border-bottom: 1px solid var(--color-border-light);
}

/* ========================================
   ARCHIVE
   ======================================== */
.archive-header {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border-light);
}

.archive-title {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    color: var(--color-text-primary);
}

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

/* Timeline Archives */
.archives-timeline {
    margin-top: var(--spacing-xl);
}

.archive-year {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin: var(--spacing-lg) 0 var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-brand);
}

.archive-item {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-border-light);
}

.archive-date {
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    white-space: nowrap;
}

.archive-title-link {
    color: var(--color-text-body);
    font-size: var(--font-size-sm);
}

.archive-title-link:hover {
    color: var(--color-brand);
}

/* ========================================
   LINKS PAGE
   ======================================== */
.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

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

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

.link-card a {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    color: var(--color-text-body);
}

.link-avatar {
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius-full);
    object-fit: cover;
    flex-shrink: 0;
    background: var(--color-bg-secondary);
}

.link-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.link-name {
    font-weight: 600;
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
}

.link-desc {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ========================================
   ERROR 404
   ======================================== */
.error-404 {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
    text-align: center;
}

.error-code {
    font-size: 8rem;
    font-weight: 900;
    color: var(--color-brand);
    line-height: 1;
    opacity: 0.2;
    margin-bottom: var(--spacing-md);
}

.error-title {
    font-size: var(--font-size-2xl);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

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

.error-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ========================================
   EMPTY STATE
   ======================================== */
.empty-state {
    text-align: center;
    padding: var(--spacing-3xl) var(--spacing-lg);
    color: var(--color-text-secondary);
}

.empty-state svg {
    margin-bottom: var(--spacing-lg);
    opacity: 0.4;
}

.empty-state h3 {
    font-size: var(--font-size-xl);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

/* ========================================
   BACK TO TOP
   ======================================== */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border: none;
    border-radius: var(--border-radius-full);
    background: var(--color-brand);
    color: #fff;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-base);
    z-index: 50;
    box-shadow: var(--shadow-md);
}

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

.back-to-top:hover {
    background: var(--color-brand-hover);
    transform: translateY(-3px);
}

/* ========================================
   FOOTER
   ======================================== */
.site-footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border-light);
    padding: var(--spacing-2xl) 0;
    text-align: center;
}

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

.footer-social {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius-full);
    background: var(--color-bg);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
    border: 1px solid var(--color-border-light);
}

.social-link:hover {
    color: var(--color-brand);
    border-color: var(--color-brand);
    transform: translateY(-2px);
}

.footer-info {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.8;
}

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

.footer-info a:hover {
    color: var(--color-brand);
}

/* ========================================
   RESPONSIVE - Tablet
   ======================================== */
@media (max-width: 1024px) {
    .content-area.with-sidebar {
        flex-direction: column;
    }

    .content-area.sidebar-left {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
    }
}

/* ========================================
   RESPONSIVE - Mobile
   ======================================== */
@media (max-width: 768px) {
    :root {
        --header-height: 56px;
    }

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

    /* Mobile Navigation */
    .menu-toggle {
        display: flex;
    }

    .site-nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--color-bg);
        padding: var(--spacing-lg);
        transform: translateX(100%);
        transition: transform var(--transition-base);
        z-index: var(--z-header);
        overflow-y: auto;
    }

    .site-nav.active {
        transform: translateX(0);
    }

    .site-nav .nav-menu {
        flex-direction: column;
        gap: var(--spacing-xs);
    }

    .site-nav .nav-menu a {
        padding: var(--spacing-md);
        font-size: var(--font-size-base);
    }

    /* Post Card Mobile */
    .post-list.layout-card .post-body {
        padding: var(--spacing-md);
    }

    .post-list.layout-list .post-card {
        flex-direction: column;
    }

    /* Post Title */
    .post-title-single {
        font-size: var(--font-size-2xl);
    }

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

    /* Comment Form */
    .comment-form-fields {
        grid-template-columns: 1fr;
    }

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

    /* Back to top */
    .back-to-top {
        bottom: 1rem;
        right: 1rem;
        width: 40px;
        height: 40px;
    }

    /* TOC */
    .toc-container {
        margin-bottom: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .post-meta-single {
        font-size: var(--font-size-xs);
    }

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

    .error-code {
        font-size: 5rem;
    }
}

/* ========================================
   LIGHTBOX
   ======================================== */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

.lightbox.active {
    opacity: 1;
    visibility: visible;
}

.lightbox-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.9);
    cursor: zoom-out;
}

.lightbox-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
    z-index: 1;
}

.lightbox-content img {
    max-width: 90vw;
    max-height: 85vh;
    object-fit: contain;
    border-radius: var(--border-radius);
    box-shadow: 0 0 60px rgba(0, 0, 0, 0.5);
}

.lightbox-close {
    position: absolute;
    top: -40px;
    right: 0;
    background: rgba(255, 255, 255, 0.15);
    border: none;
    color: #fff;
    font-size: 28px;
    width: 36px;
    height: 36px;
    border-radius: var(--border-radius-full);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-fast);
    line-height: 1;
}

.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.3);
}