/*
Theme Name: Lneu Blog
Theme URI: https://lneui.com
Author: Lneu
Author URI: https://lneui.com
Description: A modern, polished blog theme v4.0 with TOC, lightbox, code highlighting, related posts, and more.
Version: 4.0.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: lneu-blog
Tags: blog, clean, minimal, modern, responsive, cards, animations
*/

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

:root {
    --color-bg: #fafafa;
    --color-surface: #ffffff;
    --color-text: #1a1a2e;
    --color-text-secondary: #555570;
    --color-text-tertiary: #9999aa;
    --color-border: #ececf0;
    --color-border-hover: #d0d0d8;
    --color-accent: #6c5ce7;
    --color-accent-light: #a29bfe;
    --color-accent-bg: #f0eeff;
    --color-bg-hover: #f5f5f8;
    --color-link: #6c5ce7;
    --color-link-hover: #5a4bd1;
    --color-tag-bg: #f0f0f5;
    --color-code-bg: #f6f6fa;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.10);
    --shadow-accent: 0 8px 24px rgba(108, 92, 231, 0.15);
    --max-width: 1160px;
    --reading-width: 720px;
    --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", "Fira Code", "Source Code Pro", Menlo, Consolas, monospace;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;
}

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

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

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

::selection {
    background: var(--color-accent-bg);
    color: var(--color-accent);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: #d0d0d8;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: #b0b0bc;
}

/* ========== Reading Progress Bar ========== */
.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
    z-index: 9999;
    width: 0%;
    transition: width 0.1s linear;
}

/* ========== Header ========== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(250, 250, 250, 0.80);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: box-shadow var(--transition);
}

.site-header.scrolled {
    box-shadow: var(--shadow-sm);
}

.site-header-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.site-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.site-logo {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 800;
    font-size: 1.1rem;
    letter-spacing: -0.02em;
    flex-shrink: 0;
    box-shadow: var(--shadow-accent);
}

.site-title {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

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

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

.site-nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

.site-nav a {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    font-weight: 500;
    position: relative;
    transition: color var(--transition);
}

.site-nav a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    border-radius: 2px;
    transition: width var(--transition);
}

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

.site-nav a:hover::after {
    width: 100%;
}

.site-nav .search-trigger {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition);
}

.site-nav .search-trigger:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    color: var(--color-text);
}

.menu-toggle svg {
    width: 24px;
    height: 24px;
}

/* ========== Hero Section ========== */
.hero {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 80px 24px 48px;
    text-align: center;
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 16px;
    background: var(--color-accent-bg);
    color: var(--color-accent);
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 24px;
    animation: fadeInDown 0.6s ease;
}

.hero-eyebrow .dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-accent);
    animation: pulse 2s infinite;
}

.hero-title {
    font-size: 2.8rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.2;
    margin-bottom: 16px;
    animation: fadeInUp 0.8s ease;
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--color-text-secondary);
    max-width: 560px;
    margin: 0 auto;
    animation: fadeInUp 1s ease;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin-top: 40px;
    animation: fadeInUp 1.2s ease;
}

.hero-stat {
    text-align: center;
}

.hero-stat-num {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.hero-stat-label {
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
    margin-top: 2px;
}

/* ========== Main Layout ========== */
.site-main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px 64px;
    min-height: 60vh;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 32px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--color-border);
}

.section-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: 8px;
}

.section-title .icon {
    color: var(--color-accent);
}

.section-link {
    font-size: 0.85rem;
    color: var(--color-text-tertiary);
    transition: color var(--transition);
}

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

/* ========== Post Cards ========== */
.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 28px;
}

.post-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
    display: flex;
    flex-direction: column;
    animation: fadeInUp 0.6s ease backwards;
}

.post-card:nth-child(1) { animation-delay: 0.05s; }
.post-card:nth-child(2) { animation-delay: 0.1s; }
.post-card:nth-child(3) { animation-delay: 0.15s; }
.post-card:nth-child(4) { animation-delay: 0.2s; }
.post-card:nth-child(5) { animation-delay: 0.25s; }
.post-card:nth-child(6) { animation-delay: 0.3s; }

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

.post-card-thumbnail {
    width: 100%;
    aspect-ratio: 16 / 9;
    background: linear-gradient(135deg, var(--color-accent-bg), var(--color-bg-hover));
    overflow: hidden;
    position: relative;
}

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

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

.post-card-thumbnail-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.post-card-body {
    padding: 24px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.post-card-category {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    background: var(--color-accent-bg);
    color: var(--color-accent);
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 12px;
    align-self: flex-start;
    transition: background var(--transition);
}

.post-card-category:hover {
    background: var(--color-accent);
    color: white;
}

.post-card-title {
    font-size: 1.2rem;
    font-weight: 600;
    line-height: 1.5;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

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

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

.post-card-excerpt {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.post-card-meta {
    margin-top: auto;
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
    display: flex;
    align-items: center;
    gap: 12px;
    padding-top: 16px;
    border-top: 1px solid var(--color-border);
}

.post-card-meta .author {
    display: flex;
    align-items: center;
    gap: 6px;
}

.post-card-meta .author-avatar {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.65rem;
    font-weight: 700;
}

.post-card-meta .dot {
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: var(--color-text-tertiary);
}

/* ========== Single Post ========== */
.single-post-wrapper {
    max-width: var(--reading-width);
    margin: 0 auto;
    padding: 64px 0;
}

.single-post-breadcrumb {
    font-size: 0.85rem;
    color: var(--color-text-tertiary);
    margin-bottom: 32px;
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.single-post-breadcrumb a:hover {
    color: var(--color-accent);
}

.single-post-breadcrumb .sep {
    color: var(--color-text-tertiary);
}

.single-post-header {
    margin-bottom: 40px;
}

.single-post-category {
    display: inline-flex;
    padding: 4px 14px;
    background: var(--color-accent-bg);
    color: var(--color-accent);
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.single-post-title {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1.25;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
}

.single-post-meta {
    font-size: 0.85rem;
    color: var(--color-text-tertiary);
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.single-post-meta .author {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.single-post-meta .author-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.8rem;
    font-weight: 700;
}

.single-post-meta .dot {
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--color-text-tertiary);
}

.single-post-thumbnail {
    width: 100%;
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: 40px;
    box-shadow: var(--shadow-md);
}

.single-post-thumbnail img {
    width: 100%;
    height: auto;
}

/* ========== Article Content ========== */
.single-post-content {
    font-size: 1.0625rem;
    line-height: 1.9;
    color: var(--color-text);
}

.single-post-content > *:first-child {
    margin-top: 0;
}

.single-post-content p {
    margin-bottom: 1.5em;
}

.single-post-content h2,
.single-post-content h3,
.single-post-content h4 {
    margin-top: 2.2em;
    margin-bottom: 0.8em;
    font-weight: 700;
    letter-spacing: -0.02em;
    scroll-margin-top: 80px;
}

.single-post-content h2 {
    font-size: 1.6rem;
    padding-bottom: 0.3em;
    border-bottom: 2px solid var(--color-accent-bg);
}

.single-post-content h3 {
    font-size: 1.3rem;
}

.single-post-content h4 {
    font-size: 1.1rem;
}

.single-post-content blockquote {
    border-left: 4px solid var(--color-accent);
    padding: 16px 24px;
    margin: 1.5em 0;
    background: var(--color-accent-bg);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--color-text-secondary);
    font-style: italic;
}

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

.single-post-content code {
    font-family: var(--font-mono);
    background: var(--color-code-bg);
    padding: 2px 7px;
    border-radius: 4px;
    font-size: 0.88em;
    color: var(--color-accent);
    border: 1px solid var(--color-border);
}

.single-post-content pre {
    background: #1e1e2e;
    color: #cdd6f4;
    border-radius: var(--radius-md);
    padding: 24px;
    overflow-x: auto;
    margin: 1.5em 0;
    font-size: 0.9rem;
    line-height: 1.6;
    box-shadow: var(--shadow-md);
    position: relative;
}

.single-post-content pre code {
    background: none;
    padding: 0;
    border-radius: 0;
    color: inherit;
    border: none;
    font-size: inherit;
}

.single-post-content pre::before {
    content: '';
    position: absolute;
    top: 16px;
    left: 16px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #f38ba8;
    box-shadow: 20px 0 0 #f9e2af, 40px 0 0 #a6e3a1;
}

.single-post-content pre {
    padding-top: 48px;
}

.single-post-content img {
    border-radius: var(--radius-md);
    margin: 1.5em auto;
    box-shadow: var(--shadow-sm);
}

.single-post-content ul,
.single-post-content ol {
    padding-left: 1.5em;
    margin-bottom: 1.5em;
}

.single-post-content li {
    margin-bottom: 0.5em;
}

.single-post-content a {
    color: var(--color-link);
    text-decoration: underline;
    text-decoration-color: var(--color-accent-light);
    text-underline-offset: 3px;
    transition: text-decoration-color var(--transition);
}

.single-post-content a:hover {
    text-decoration-color: var(--color-accent);
}

.single-post-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5em 0;
    font-size: 0.95rem;
}

.single-post-content th,
.single-post-content td {
    padding: 12px 16px;
    border: 1px solid var(--color-border);
    text-align: left;
}

.single-post-content th {
    background: var(--color-accent-bg);
    font-weight: 600;
    color: var(--color-accent);
}

.single-post-content tr:nth-child(even) td {
    background: var(--color-bg-hover);
}

.single-post-content hr {
    border: none;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-border), transparent);
    margin: 2.5em 0;
}

/* ========== Post Footer ========== */
.single-post-footer {
    margin-top: 56px;
    padding-top: 32px;
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.post-tags a {
    background: var(--color-tag-bg);
    padding: 6px 14px;
    border-radius: 999px;
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    transition: all var(--transition);
}

.post-tags a:hover {
    background: var(--color-accent);
    color: white;
}

.post-share {
    display: flex;
    gap: 8px;
}

.share-btn {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--color-tag-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    transition: all var(--transition);
    cursor: pointer;
    border: none;
}

.share-btn:hover {
    background: var(--color-accent);
    color: white;
    transform: translateY(-2px);
}

/* ========== Author Box ========== */
.author-box {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 32px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    margin-top: 40px;
}

.author-box .avatar {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
    flex-shrink: 0;
    box-shadow: var(--shadow-accent);
}

.author-box-info h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.author-box-info p {
    font-size: 0.88rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ========== Pagination ========== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin-top: 56px;
}

.pagination .page-numbers {
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
    font-weight: 500;
}

.pagination .page-numbers:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    box-shadow: var(--shadow-sm);
}

.pagination .page-numbers.current {
    background: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
    box-shadow: var(--shadow-accent);
}

/* ========== Page Template ========== */
.page-content {
    max-width: var(--reading-width);
    margin: 0 auto;
    padding: 64px 0;
}

.page-title {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 32px;
    letter-spacing: -0.03em;
}

/* ========== 404 ========== */
.error-404 {
    text-align: center;
    padding: 120px 24px;
}

.error-404 .error-code {
    font-size: 6rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.04em;
    line-height: 1;
}

.error-404 p {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    margin: 16px 0 32px;
}

.error-404 .btn-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-md);
    background: var(--color-accent);
    color: white;
    font-weight: 600;
    transition: all var(--transition);
    box-shadow: var(--shadow-accent);
}

.error-404 .btn-back:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: white;
}

/* ========== Footer ========== */
.site-footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: 48px 24px 32px;
    margin-top: 64px;
}

.footer-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 32px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.footer-brand .site-logo {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    font-size: 0.95rem;
}

.footer-brand-info h4 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-text);
}

.footer-brand-info p {
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
    margin-top: 2px;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    transition: color var(--transition);
}

.footer-links a:hover {
    color: var(--color-accent);
}

.footer-bottom {
    max-width: var(--max-width);
    margin: 32px auto 0;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
}

.footer-bottom .heart {
    color: #f38ba8;
}

/* ========== Search Modal ========== */
.search-modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(8px);
    z-index: 200;
    align-items: flex-start;
    justify-content: center;
    padding-top: 15vh;
}

.search-modal.active {
    display: flex;
    animation: fadeIn 0.2s ease;
}

.search-modal-inner {
    width: 90%;
    max-width: 560px;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    animation: fadeInDown 0.3s ease;
}

.search-modal-form {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 20px 24px;
    border-bottom: 1px solid var(--color-border);
}

.search-modal-form svg {
    width: 20px;
    height: 20px;
    color: var(--color-text-tertiary);
    flex-shrink: 0;
}

.search-modal-form input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 1.1rem;
    font-family: inherit;
    color: var(--color-text);
    background: transparent;
}

.search-modal-form button {
    background: none;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 4px 10px;
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    cursor: pointer;
}

/* ========== Animations ========== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ========== Responsive ========== */
@media (max-width: 768px) {
    .site-header-inner {
        padding: 0 16px;
        height: 60px;
    }

    .site-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-surface);
        border-bottom: 1px solid var(--color-border);
        flex-direction: column;
        padding: 16px;
        gap: 16px;
        box-shadow: var(--shadow-md);
    }

    .site-nav.active {
        display: flex;
    }

    .menu-toggle {
        display: flex;
        align-items: center;
    }

    .site-main {
        padding: 0 16px 48px;
    }

    .hero {
        padding: 48px 16px 32px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-stats {
        gap: 32px;
    }

    .posts-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .single-post-wrapper {
        padding: 32px 0;
    }

    .single-post-title {
        font-size: 1.8rem;
    }

    .single-post-content {
        font-size: 1rem;
    }

    .author-box {
        flex-direction: column;
        text-align: center;
        padding: 24px;
    }

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

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

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

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.6rem;
    }

    .hero-stats {
        gap: 24px;
    }

    .hero-stat-num {
        font-size: 1.2rem;
    }

    .post-card-body {
        padding: 20px;
    }
}

/* ========== v3.0 Additions ========== */

/* --- Back to Top Button --- */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 90;
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px);
    transition: all var(--transition);
    box-shadow: var(--shadow-md);
}

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

.back-to-top:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
    box-shadow: var(--shadow-accent);
}

/* --- Code Copy Button --- */
.single-post-content pre {
    position: relative;
}

.code-copy-btn {
    position: absolute;
    top: 14px;
    right: 14px;
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.1);
    color: #999;
    font-size: 0.75rem;
    border: 1px solid rgba(255, 255, 255, 0.15);
    cursor: pointer;
    opacity: 0;
    transition: all 0.2s ease;
    font-family: var(--font-sans);
    z-index: 2;
}

.single-post-content pre:hover .code-copy-btn {
    opacity: 1;
}

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

.code-copy-btn.copied {
    color: #a6e3a1;
    border-color: #a6e3a1;
}

/* --- Lightbox --- */
.lightbox-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
    z-index: 300;
    align-items: center;
    justify-content: center;
    padding: 32px;
    cursor: zoom-out;
}

.lightbox-overlay.active {
    display: flex;
    animation: fadeIn 0.2s ease;
}

.lightbox-overlay img {
    max-width: 90vw;
    max-height: 90vh;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    animation: fadeInUp 0.3s ease;
}

/* --- Post TOC (Table of Contents) --- */
.single-post-layout {
    display: flex;
    gap: 48px;
    align-items: flex-start;
}

.single-post-article {
    flex: 1;
    min-width: 0;
}

.post-toc {
    position: sticky;
    top: 88px;
    width: 240px;
    flex-shrink: 0;
    display: none;
}

@media (min-width: 1100px) {
    .post-toc {
        display: block;
    }
}

.toc-title {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.toc-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
    border-left: 2px solid var(--color-border);
    padding-left: 16px;
}

.toc-link {
    font-size: 0.85rem;
    color: var(--color-text-tertiary);
    padding: 4px 0;
    line-height: 1.5;
    transition: all var(--transition);
    border-left: 2px solid transparent;
    margin-left: -2px;
    padding-left: 14px;
}

.toc-link:hover {
    color: var(--color-text);
}

.toc-link.active {
    color: var(--color-accent);
    font-weight: 500;
    border-left-color: var(--color-accent);
}

.toc-link.toc-level-3 {
    padding-left: 28px;
    font-size: 0.8rem;
}

/* --- Related Posts --- */
.related-posts {
    margin-top: 56px;
    padding-top: 40px;
    border-top: 1px solid var(--color-border);
}

.related-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--color-text);
}

.related-title svg {
    color: var(--color-accent);
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.related-card {
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: transform var(--transition);
    display: block;
}

.related-card:hover {
    transform: translateY(-3px);
}

.related-thumbnail {
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--color-accent-bg);
}

.related-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

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

.related-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-accent-bg), var(--color-bg-hover));
}

.related-info {
    padding: 12px 4px 0;
}

.related-info h4 {
    font-size: 0.9rem;
    font-weight: 600;
    line-height: 1.5;
    margin-bottom: 4px;
    color: var(--color-text);
}

.related-date {
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
}

/* --- Load More Button --- */
.load-more-wrapper {
    display: flex;
    justify-content: center;
    margin-top: 48px;
}

.load-more-btn {
    padding: 12px 40px;
    border-radius: 999px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

.load-more-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    box-shadow: var(--shadow-sm);
}

.load-more-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.load-more-btn .load-more-spinner svg {
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* --- Search Results --- */
.search-result-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 24px;
    border-bottom: 1px solid var(--color-border);
    transition: background var(--transition);
    text-decoration: none;
}

.search-result-item:hover {
    background: var(--color-bg-hover);
}

.search-result-item img {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    object-fit: cover;
    flex-shrink: 0;
}

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

.search-result-title {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: 2px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.search-result-date {
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
}

.search-no-results {
    padding: 32px 24px;
    text-align: center;
    color: var(--color-text-tertiary);
    font-size: 0.9rem;
}

/* --- Archive Header --- */
.archive-header {
    margin-bottom: 40px;
    padding: 40px 0;
    text-align: center;
    border-bottom: 1px solid var(--color-border);
}

.archive-header h1 {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
}

.archive-header .archive-description {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
}

.archive-header .archive-count {
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
    margin-top: 8px;
}

/* --- Skeleton Loading --- */
.skeleton-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.skeleton-thumb {
    width: 100%;
    aspect-ratio: 16 / 9;
    background: linear-gradient(90deg, var(--color-bg-hover) 25%, var(--color-accent-bg) 50%, var(--color-bg-hover) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

.skeleton-body {
    padding: 24px;
}

.skeleton-line {
    height: 12px;
    border-radius: 6px;
    margin-bottom: 10px;
    background: linear-gradient(90deg, var(--color-bg-hover) 25%, var(--color-accent-bg) 50%, var(--color-bg-hover) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

.skeleton-line:last-child {
    width: 60%;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* --- Toast --- */
.lneu-toast {
    position: fixed;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-text);
    color: white;
    padding: 10px 24px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    z-index: 9999;
    animation: fadeInUp 0.3s ease;
    box-shadow: var(--shadow-lg);
}

/* --- Comments --- */
.comments-area {
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--color-border);
}

.comments-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 24px;
}

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

.comment-body {
    padding: 20px 0;
    border-bottom: 1px solid var(--color-border);
}

.comment-author {
    font-weight: 500;
    color: var(--color-text);
}

.comment-meta {
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
    margin-bottom: 8px;
}

.comment-content {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.comment-respond {
    margin-top: 32px;
}

.comment-reply-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.comment-form input,
.comment-form textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.9rem;
    margin-bottom: 12px;
}

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

.comment-form .submit {
    background: var(--color-accent);
    color: white;
    border: none;
    padding: 10px 24px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 500;
    width: auto;
}

.comments-closed {
    text-align: center;
    padding: 32px;
    color: var(--color-text-tertiary);
    font-size: 0.9rem;
}

/* --- Prism Overrides --- */
.single-post-content pre[class*="language-"] {
    padding-top: 48px !important;
    margin: 1.5em 0 !important;
    border-radius: var(--radius-md) !important;
}

/* --- Responsive v3 --- */
@media (max-width: 768px) {
    .related-grid {
        grid-template-columns: 1fr;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 40px;
        height: 40px;
    }
}

/* ========== v3.0 Additions ========== */

/* --- Back to Top Button --- */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--color-text-secondary);
    box-shadow: var(--shadow-md);
    z-index: 90;
    opacity: 0;
    transform: translateY(20px);
    pointer-events: none;
    transition: all var(--transition);
}

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

.back-to-top:hover {
    background: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow-accent);
}

/* --- Code Copy Button --- */
.single-post-content pre {
    position: relative;
}

.code-copy-btn {
    position: absolute;
    top: 12px;
    right: 12px;
    padding: 4px 10px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 6px;
    color: #999;
    font-size: 0.75rem;
    font-family: var(--font-sans);
    cursor: pointer;
    opacity: 0;
    transition: all var(--transition);
    z-index: 2;
}

.single-post-content pre:hover .code-copy-btn {
    opacity: 1;
}

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

.code-copy-btn.copied {
    background: rgba(166, 227, 161, 0.2);
    border-color: rgba(166, 227, 161, 0.3);
    color: #a6e3a1;
}

/* --- Lightbox --- */
.lightbox-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
    z-index: 300;
    align-items: center;
    justify-content: center;
    padding: 40px;
    cursor: zoom-out;
    animation: fadeIn 0.2s ease;
}

.lightbox-overlay.active {
    display: flex;
}

.lightbox-overlay img {
    max-width: 90%;
    max-height: 90vh;
    border-radius: var(--radius-md);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    animation: fadeInUp 0.3s ease;
}

.single-post-content img {
    cursor: zoom-in;
    transition: transform 0.3s ease;
}

.single-post-content img:hover {
    transform: scale(1.02);
}

/* --- Table of Contents --- */
.single-post-layout {
    display: grid;
    grid-template-columns: 1fr 220px;
    gap: 48px;
    align-items: start;
}

.post-toc {
    position: sticky;
    top: 88px;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    padding: 20px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
}

.toc-title {
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.toc-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.toc-link {
    display: block;
    padding: 6px 12px;
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    line-height: 1.5;
    border-left: 2px solid transparent;
}

.toc-link:hover {
    color: var(--color-accent);
    background: var(--color-accent-bg);
}

.toc-link.active {
    color: var(--color-accent);
    font-weight: 600;
    border-left-color: var(--color-accent);
    background: var(--color-accent-bg);
}

.toc-link.toc-level-3 {
    padding-left: 28px;
    font-size: 0.8rem;
}

/* --- Related Posts --- */
.related-posts {
    margin-top: 56px;
    padding-top: 40px;
    border-top: 1px solid var(--color-border);
}

.related-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.related-title svg {
    color: var(--color-accent);
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.related-card {
    display: block;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}

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

.related-thumbnail {
    width: 100%;
    aspect-ratio: 16 / 9;
    background: var(--color-accent-bg);
    overflow: hidden;
}

.related-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

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

.related-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    font-size: 1.5rem;
    font-weight: 800;
}

.related-info {
    padding: 16px;
}

.related-info h4 {
    font-size: 0.95rem;
    font-weight: 600;
    line-height: 1.5;
    margin-bottom: 6px;
    color: var(--color-text);
}

.related-date {
    font-size: 0.78rem;
    color: var(--color-text-tertiary);
}

/* --- Load More Button --- */
.load-more-wrapper {
    display: flex;
    justify-content: center;
    margin-top: 48px;
}

.load-more-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 32px;
    border-radius: var(--radius-md);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    font-size: 0.9rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition);
}

.load-more-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    box-shadow: var(--shadow-sm);
}

.load-more-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.load-more-btn .load-more-spinner svg {
    animation: spin 0.8s linear infinite;
}

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

/* --- Archive Header --- */
.archive-header {
    margin-bottom: 40px;
    padding: 40px 0;
    text-align: center;
    border-bottom: 1px solid var(--color-border);
}

.archive-title {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 8px;
}

.archive-description {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
}

.archive-count {
    display: inline-block;
    margin-top: 12px;
    padding: 4px 14px;
    background: var(--color-accent-bg);
    color: var(--color-accent);
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 600;
}

/* --- Search Results --- */
.search-info {
    margin-bottom: 32px;
    padding: 24px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.search-info h2 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.search-info p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.search-empty {
    text-align: center;
    padding: 60px 24px;
}

.search-empty .icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.search-empty p {
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: 24px;
}

/* --- Search Results Modal --- */
.search-results-list {
    max-height: 400px;
    overflow-y: auto;
}

.search-result-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 24px;
    border-bottom: 1px solid var(--color-border);
    transition: background var(--transition);
}

.search-result-item:hover {
    background: var(--color-bg-hover);
}

.search-result-item img {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    object-fit: cover;
    flex-shrink: 0;
}

.search-result-info {
    flex: 1;
}

.search-result-title {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
    line-height: 1.4;
}

.search-result-date {
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    margin-top: 2px;
}

.search-no-results {
    padding: 24px;
    text-align: center;
    color: var(--color-text-tertiary);
    font-size: 0.9rem;
}

/* --- Skeleton Loading --- */
.skeleton-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    height: 360px;
}

.skeleton-thumb {
    width: 100%;
    aspect-ratio: 16/9;
    background: linear-gradient(90deg, var(--color-bg-hover) 25%, var(--color-border) 50%, var(--color-bg-hover) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

.skeleton-body {
    padding: 24px;
}

.skeleton-line {
    height: 12px;
    border-radius: 6px;
    background: linear-gradient(90deg, var(--color-bg-hover) 25%, var(--color-border) 50%, var(--color-bg-hover) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    margin-bottom: 8px;
}

.skeleton-line:nth-child(2) {
    width: 80%;
}

.skeleton-line:nth-child(3) {
    width: 60%;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* --- Prism Overrides --- */
.single-post-content pre[class*="language-"] {
    margin: 1.5em 0;
    border-radius: var(--radius-md);
    padding-top: 48px;
}

/* --- Responsive v3 --- */
@media (max-width: 1024px) {
    .single-post-layout {
        grid-template-columns: 1fr;
    }

    .post-toc {
        position: static;
        max-height: none;
        margin-bottom: 32px;
        order: -1;
    }

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

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

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 40px;
        height: 40px;
    }
}

/* ========== v4.0 Additions ========== */

/* --- Site Content Layout (Main + Sidebar) --- */
.site-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px 64px;
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 48px;
    align-items: start;
}

.site-content > .site-main {
    padding: 0;
    min-height: 60vh;
}

/* --- Sidebar --- */
.site-sidebar {
    position: sticky;
    top: 88px;
}

.sidebar-widget {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 24px;
    margin-bottom: 24px;
}

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

.widget-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    gap: 6px;
}

.widget-title svg {
    color: var(--color-accent);
}

/* Popular Posts Widget */
.widget-popular-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.widget-popular-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px;
    border-radius: var(--radius-sm);
    transition: background var(--transition);
}

.widget-popular-item:hover {
    background: var(--color-bg-hover);
}

.widget-popular-rank {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
}

.widget-popular-rank:nth-child(1) { background: var(--color-accent); color: white; }
.widget-popular-rank:nth-child(2) { background: var(--color-accent-light); color: white; }
.widget-popular-rank:nth-child(3) { background: #c4b8f7; color: white; }

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

.widget-popular-title {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text);
    line-height: 1.4;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.widget-popular-meta {
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    margin-top: 2px;
}

/* Tag Cloud Widget */
.widget-tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.widget-tag-cloud a {
    display: inline-block;
    padding: 4px 12px;
    background: var(--color-bg-hover);
    border-radius: 999px;
    font-size: 0.8rem !important;
    color: var(--color-text-secondary);
    transition: all var(--transition);
}

.widget-tag-cloud a:hover {
    background: var(--color-accent);
    color: white;
}

/* Categories Widget */
.widget-cat-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.widget-cat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    transition: background var(--transition);
}

.widget-cat-item:hover {
    background: var(--color-bg-hover);
}

.widget-cat-name {
    font-size: 0.85rem;
    color: var(--color-text);
    font-weight: 500;
}

.widget-cat-count {
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    background: var(--color-bg-hover);
    padding: 2px 8px;
    border-radius: 999px;
}

/* --- Floating Share Bar --- */
.float-share {
    position: fixed;
    left: 32px;
    top: 50%;
    transform: translateY(-50%) translateX(-20px);
    display: flex;
    flex-direction: column;
    gap: 8px;
    z-index: 80;
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition);
}

.float-share.visible {
    opacity: 1;
    transform: translateY(-50%) translateX(0);
    pointer-events: auto;
}

.float-share-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition);
    box-shadow: var(--shadow-sm);
}

.float-share-btn:hover {
    background: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
    transform: scale(1.1);
}

/* --- Font Size Controls --- */
.font-size-controls {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 24px;
    padding: 12px 16px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.font-size-controls .label {
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
    margin-right: 4px;
}

.font-size-btn {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text-secondary);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.font-size-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.font-size-btn.active {
    background: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
}

/* --- Selection Share Popup --- */
.selection-share {
    position: fixed;
    display: none;
    z-index: 200;
    background: var(--color-text);
    border-radius: var(--radius-sm);
    padding: 6px;
    box-shadow: var(--shadow-lg);
    gap: 2px;
}

.selection-share.visible {
    display: flex;
}

.selection-share-btn {
    background: none;
    border: none;
    color: white;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: background var(--transition);
}

.selection-share-btn:hover {
    background: rgba(255, 255, 255, 0.15);
}

/* --- Post Navigation (Prev/Next) --- */
.post-navigation {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 40px;
}

.post-nav-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 20px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition);
}

.post-nav-item:hover {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-sm);
}

.post-nav-label {
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.post-nav-title {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text);
    line-height: 1.4;
}

.post-nav-item:hover .post-nav-title {
    color: var(--color-accent);
}

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

.post-nav-placeholder {
    padding: 20px;
    text-align: center;
    color: var(--color-text-tertiary);
    font-size: 0.85rem;
    background: var(--color-bg);
    border-radius: var(--radius-md);
}

/* --- Timeline Archives --- */
.timeline-archives {
    max-width: var(--reading-width);
    margin: 0 auto;
    padding: 32px 0;
}

.timeline-year {
    margin-bottom: 48px;
}

.timeline-year-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.timeline-year-badge {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
    color: white;
    font-size: 1.2rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-accent);
}

.timeline-year-line {
    flex: 1;
    height: 2px;
    background: var(--color-border);
}

.timeline-month {
    margin-bottom: 24px;
    padding-left: 32px;
    border-left: 2px solid var(--color-border);
}

.timeline-month-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: 12px;
}

.timeline-item {
    padding: 12px 0 12px 24px;
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -7px;
    top: 20px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    transition: all var(--transition);
}

.timeline-item:hover::before {
    border-color: var(--color-accent);
    background: var(--color-accent-bg);
}

.timeline-item-date {
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    margin-bottom: 2px;
}

.timeline-item-title a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text);
}

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

/* --- Links Page --- */
.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    max-width: var(--max-width);
    margin: 0 auto;
}

.link-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition);
}

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

.link-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    font-weight: 700;
    flex-shrink: 0;
}

.link-info h4 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 2px;
}

.link-info p {
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
}

/* --- Custom Login Page --- */
body.lneu-login {
    background: linear-gradient(135deg, #6c5ce7 0%, #a29bfe 100%) !important;
}

.lneu-login .login form {
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.lneu-login .login #wp-submit {
    background: #6c5ce7 !important;
    border-color: #6c5ce7 !important;
    border-radius: 8px !important;
    font-weight: 600 !important;
    transition: all 0.3s !important;
}

.lneu-login .login #wp-submit:hover {
    background: #5a4bd1 !important;
    transform: translateY(-1px);
}

.lneu-login .login a {
    color: #6c5ce7 !important;
}

/* --- Image Lazy Load Fade-in --- */
.single-post-content img {
    opacity: 0;
    transition: opacity 0.5s ease;
}

.single-post-content img.loaded,
.single-post-content img[data-lazy="false"] {
    opacity: 1;
}

/* --- Reading Time Remaining --- */
.reading-time-remaining {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    padding: 2px 8px;
    background: var(--color-accent-bg);
    border-radius: 999px;
    margin-left: 8px;
}

/* --- Last Modified --- */
.last-modified {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    margin-top: 4px;
}

/* --- Word Count Badge --- */
.word-count-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 10px;
    background: var(--color-bg-hover);
    border-radius: 999px;
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

/* --- Print Button --- */
.print-btn {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-left: auto;
}

.print-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* --- Responsive v4 --- */
@media (max-width: 1024px) {
    .site-content {
        grid-template-columns: 1fr;
    }

    .site-sidebar {
        position: static;
        max-height: none;
    }

    .float-share {
        display: none;
    }
}

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

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

    .font-size-controls {
        flex-wrap: wrap;
    }
}

/* ========== v4.0 Additions ========== */

/* --- Layout with Sidebar --- */
.site-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px 64px;
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 40px;
    align-items: start;
}

.site-content > .site-main {
    padding: 0;
    margin: 0;
    min-width: 0;
}

/* --- Sidebar --- */
.site-sidebar {
    position: sticky;
    top: 88px;
}

.sidebar-widget {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 24px;
    margin-bottom: 20px;
}

.sidebar-widget-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    gap: 6px;
}

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

.sidebar-widget li {
    padding: 8px 0;
    border-bottom: 1px solid var(--color-border);
}

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

.sidebar-widget a {
    color: var(--color-text-secondary);
    font-size: 0.85rem;
    transition: color var(--transition);
}

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

/* Popular Posts Widget */
.popular-post-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 0;
    border-bottom: 1px solid var(--color-border);
}

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

.popular-post-rank {
    width: 24px;
    height: 24px;
    border-radius: 6px;
    background: var(--color-accent-bg);
    color: var(--color-accent);
    font-size: 0.75rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.popular-post-item:nth-child(1) .popular-post-rank {
    background: var(--color-accent);
    color: white;
}

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

.popular-post-title {
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--color-text);
    line-height: 1.4;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.popular-post-views {
    font-size: 0.72rem;
    color: var(--color-text-tertiary);
    margin-top: 2px;
}

/* Tag Cloud Widget */
.sidebar-tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.sidebar-tag-cloud a {
    padding: 4px 12px;
    background: var(--color-tag-bg);
    border-radius: 999px;
    font-size: 0.78rem;
    color: var(--color-text-secondary);
    transition: all var(--transition);
}

.sidebar-tag-cloud a:hover {
    background: var(--color-accent);
    color: white;
}

/* Categories Widget */
.sidebar-categories li {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar-categories .cat-count {
    background: var(--color-tag-bg);
    padding: 2px 8px;
    border-radius: 999px;
    font-size: 0.72rem;
    color: var(--color-text-tertiary);
}

/* --- Font Size Controls --- */
.font-size-controls {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 32px;
    padding: 12px 16px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.font-size-label {
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
    margin-right: 4px;
}

.font-size-btn {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text-secondary);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.font-size-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.font-size-btn.active {
    background: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
}

.font-size-current {
    font-size: 0.78rem;
    color: var(--color-text-tertiary);
    min-width: 40px;
    text-align: center;
}

/* --- Floating Share Bar --- */
.float-share {
    position: fixed;
    left: 24px;
    top: 50%;
    transform: translateY(-50%) translateX(-100px);
    display: flex;
    flex-direction: column;
    gap: 8px;
    z-index: 80;
    opacity: 0;
    transition: all var(--transition);
}

.float-share.visible {
    opacity: 1;
    transform: translateY(-50%) translateX(0);
}

.float-share-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition);
    box-shadow: var(--shadow-sm);
}

.float-share-btn:hover {
    background: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
    transform: scale(1.1);
}

/* --- Selection Share Popup --- */
.selection-share {
    position: fixed;
    z-index: 250;
    display: none;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    padding: 6px;
    gap: 4px;
    animation: fadeIn 0.15s ease;
}

.selection-share.visible {
    display: flex;
}

.selection-share-btn {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    border: none;
    background: transparent;
    color: var(--color-text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

.selection-share-btn:hover {
    background: var(--color-accent-bg);
    color: var(--color-accent);
}

/* --- Post Navigation (Prev/Next) --- */
.post-navigation {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 48px;
}

.post-nav-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 20px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    transition: all var(--transition);
}

.post-nav-item:hover {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-sm);
}

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

.post-nav-label {
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: flex;
    align-items: center;
    gap: 4px;
}

.post-nav-item.next .post-nav-label {
    justify-content: flex-end;
}

.post-nav-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-text);
    line-height: 1.4;
    transition: color var(--transition);
}

.post-nav-item:hover .post-nav-title {
    color: var(--color-accent);
}

/* --- Timeline Archives --- */
.timeline-archives {
    position: relative;
    padding-left: 24px;
}

.timeline-archives::before {
    content: '';
    position: absolute;
    left: 6px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-border);
}

.timeline-year {
    position: relative;
    margin-bottom: 32px;
}

.timeline-year-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
}

.timeline-year-dot {
    position: absolute;
    left: -22px;
    top: 4px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-accent);
    border: 3px solid var(--color-bg);
    box-shadow: 0 0 0 2px var(--color-accent);
}

.timeline-year-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-text);
}

.timeline-year-count {
    padding: 2px 10px;
    background: var(--color-accent-bg);
    color: var(--color-accent);
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 600;
}

.timeline-month {
    margin-left: 16px;
    margin-bottom: 16px;
}

.timeline-month-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
}

.timeline-post {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 0;
    color: var(--color-text-secondary);
    font-size: 0.85rem;
    transition: color var(--transition);
}

.timeline-post:hover {
    color: var(--color-accent);
}

.timeline-post-date {
    color: var(--color-text-tertiary);
    font-size: 0.78rem;
    min-width: 40px;
}

/* --- Links Page --- */
.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.link-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    transition: all var(--transition);
}

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

.link-card-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 1.2rem;
    flex-shrink: 0;
}

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

.link-card-name {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 2px;
}

.link-card-desc {
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* --- Reading Time Remaining --- */
.reading-time-remaining {
    position: fixed;
    bottom: 32px;
    left: 32px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 999px;
    padding: 8px 16px;
    font-size: 0.78rem;
    color: var(--color-text-secondary);
    box-shadow: var(--shadow-sm);
    z-index: 85;
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition);
    display: flex;
    align-items: center;
    gap: 6px;
}

.reading-time-remaining.visible {
    opacity: 1;
    transform: translateY(0);
}

.reading-time-remaining svg {
    color: var(--color-accent);
}

/* --- Image Lazy Load Fade-in --- */
.single-post-content img {
    opacity: 0;
    transition: opacity 0.4s ease;
}

.single-post-content img.loaded {
    opacity: 1;
}

/* --- Print Button --- */
.print-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--color-tag-bg);
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

.print-btn:hover {
    background: var(--color-accent);
    color: white;
}

/* --- Customizer Dynamic CSS --- */
.customizer-vars {
    display: none;
}

/* --- Custom Login Page --- */
.login.lneu-custom-login {
    background: linear-gradient(135deg, #6c5ce7 0%, #a29bfe 100%) !important;
}

.login.lneu-custom-login #loginform {
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
}

.login.lneu-custom-login .button-primary {
    background: #6c5ce7 !important;
    border-color: #6c5ce7 !important;
    border-radius: 8px;
    font-weight: 600;
}

.login.lneu-custom-login .button-primary:hover {
    background: #5a4bd1 !important;
}

.login.lneu-custom-login #login h1 a {
    color: #6c5ce7;
}

/* --- Last Modified --- */
.last-modified {
    font-size: 0.78rem;
    color: var(--color-text-tertiary);
    margin-top: 8px;
    display: flex;
    align-items: center;
    gap: 4px;
}

/* --- Word Count --- */
.word-count-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    background: var(--color-tag-bg);
    border-radius: 999px;
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
}

/* --- TOC Collapse --- */
.toc-link.toc-level-3.collapsed {
    display: none;
}

.toc-toggle {
    cursor: pointer;
    user-select: none;
}

.toc-toggle .toggle-icon {
    display: inline-block;
    transition: transform var(--transition);
    margin-right: 4px;
    font-size: 0.7rem;
}

.toc-toggle.collapsed .toggle-icon {
    transform: rotate(-90deg);
}

/* --- Responsive v4 --- */
@media (max-width: 1024px) {
    .site-content {
        grid-template-columns: 1fr;
    }

    .site-sidebar {
        position: static;
        display: none;
    }

    .float-share {
        display: none;
    }
}

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

    .post-nav-item.next {
        text-align: left;
    }

    .post-nav-item.next .post-nav-label {
        justify-content: flex-start;
    }

    .reading-time-remaining {
        display: none;
    }

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

/* ========== v4.0 Compatibility Fixes ========== */
.site-sidebar .widget {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 24px;
    margin-bottom: 20px;
}
.site-sidebar .widget-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--color-border);
}
.site-sidebar .widget ul { list-style: none; padding: 0; }
.site-sidebar .widget li { padding: 8px 0; border-bottom: 1px solid var(--color-border); }
.site-sidebar .widget li:last-child { border-bottom: none; }
.site-sidebar .widget a { color: var(--color-text-secondary); font-size: 0.85rem; transition: color var(--transition); }
.site-sidebar .widget a:hover { color: var(--color-accent); }
.site-sidebar .lneu-popular-posts { list-style: none; padding: 0; }
.site-sidebar .popular-post-link { display: flex; align-items: center; gap: 8px; padding: 10px 0; border-bottom: 1px solid var(--color-border); }
.site-sidebar .popular-post-link:last-child { border-bottom: none; }
.site-sidebar .popular-post-title { font-size: 0.82rem; font-weight: 500; color: var(--color-text); flex: 1; }
.site-sidebar .popular-post-views { font-size: 0.72rem; color: var(--color-text-tertiary); }
.site-sidebar .lneu-category-list { list-style: none; padding: 0; }
.site-sidebar .lneu-category-list li { display: flex; justify-content: space-between; align-items: center; padding: 8px 0; border-bottom: 1px solid var(--color-border); }
.site-sidebar .category-count { background: var(--color-tag-bg); padding: 2px 8px; border-radius: 999px; font-size: 0.72rem; color: var(--color-text-tertiary); }
article .post-content { font-size: 1.0625rem; line-height: 1.9; color: var(--color-text); }
article .post-content > *:first-child { margin-top: 0; }
article .post-content p { margin-bottom: 1.5em; }
article .post-content h2 { margin-top: 2.2em; margin-bottom: 0.8em; font-weight: 700; font-size: 1.6rem; padding-bottom: 0.3em; border-bottom: 2px solid var(--color-accent-bg); scroll-margin-top: 80px; }
article .post-content h3 { margin-top: 2.2em; margin-bottom: 0.8em; font-weight: 700; font-size: 1.3rem; scroll-margin-top: 80px; }
article .post-content blockquote { border-left: 4px solid var(--color-accent); padding: 16px 24px; margin: 1.5em 0; background: var(--color-accent-bg); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--color-text-secondary); font-style: italic; }
article .post-content code { font-family: var(--font-mono); background: var(--color-code-bg); padding: 2px 7px; border-radius: 4px; font-size: 0.88em; color: var(--color-accent); border: 1px solid var(--color-border); }
article .post-content pre { background: #1e1e2e; color: #cdd6f4; border-radius: var(--radius-md); padding: 48px 24px 24px; overflow-x: auto; margin: 1.5em 0; font-size: 0.9rem; line-height: 1.6; box-shadow: var(--shadow-md); position: relative; }
article .post-content pre code { background: none; padding: 0; border-radius: 0; color: inherit; border: none; font-size: inherit; }
article .post-content pre::before { content: ""; position: absolute; top: 16px; left: 16px; width: 12px; height: 12px; border-radius: 50%; background: #f38ba8; box-shadow: 20px 0 0 #f9e2af, 40px 0 0 #a6e3a1; }
article .post-content img { border-radius: var(--radius-md); margin: 1.5em auto; box-shadow: var(--shadow-sm); max-width: 100%; height: auto; display: block; }
article .post-content ul, article .post-content ol { padding-left: 1.5em; margin-bottom: 1.5em; }
article .post-content a { color: var(--color-link); text-decoration: underline; text-decoration-color: var(--color-accent-light); text-underline-offset: 3px; }
article .post-content hr { border: none; height: 2px; background: linear-gradient(90deg, transparent, var(--color-border), transparent); margin: 2.5em 0; }