/* ===== CSS Variables ===== */
:root {
    --sidebar-width: 280px;
    --toc-width: 250px;
    --header-height: 60px;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

/* Light Theme */
html[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-tertiary: #adb5bd;
    --border-color: #dee2e6;
    --link-color: #0066cc;
    --link-hover: #0052a3;
    --code-bg: #f5f5f5;
    --code-border: #e0e0e0;
    --accent-color: #0066cc;
    --shadow: 0 2px 8px rgba(0,0,0,0.1);
}

/* Dark Theme */
html[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #3d3d3d;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --text-tertiary: #707070;
    --border-color: #404040;
    --link-color: #66b3ff;
    --link-hover: #99ccff;
    --code-bg: #2d2d2d;
    --code-border: #404040;
    --accent-color: #66b3ff;
    --shadow: 0 2px 8px rgba(0,0,0,0.3);
}

/* ===== Base Styles ===== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: var(--transition);
}

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

/* ===== Mobile Header ===== */
.mobile-header {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(var(--bg-primary-rgb, 255, 255, 255), 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 0 var(--spacing-md);
    align-items: center;
    justify-content: space-between;
    z-index: 1000;
}

html[data-theme="light"] .mobile-header {
    --bg-primary-rgb: 255, 255, 255;
}

html[data-theme="dark"] .mobile-header {
    --bg-primary-rgb: 26, 26, 26;
}

.menu-toggle {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.header-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

/* ===== Layout Container ===== */
.container {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    width: 100%;
    min-height: 100vh;
    margin: 0;
    padding: 0;
    gap: 0;
}

/* ===== Sidebar (Left Menu) ===== */
.sidebar {
    position: sticky;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    overflow-y: auto;
    overflow-x: hidden;
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    flex-shrink: 0;
}

.sidebar-profile {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.profile-image {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--border-color);
}

.sidebar-social {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.social-link,
.theme-toggle {
    color: var(--text-secondary);
    transition: var(--transition);
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
    display: flex;
    align-items: center;
}

.social-link:hover,
.theme-toggle:hover {
    color: var(--accent-color);
}

.theme-toggle .sun-icon {
    display: none;
}

.theme-toggle .moon-icon {
    display: block;
}

html[data-theme="light"] .theme-toggle .sun-icon {
    display: block;
}

html[data-theme="light"] .theme-toggle .moon-icon {
    display: none;
}

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

.sidebar-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.search-form {
    position: relative;
}

.search-input {
    width: 100%;
    padding: var(--spacing-sm) 2.5rem var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.95rem;
}

.search-button {
    position: absolute;
    right: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-sm);
    display: flex;
    align-items: center;
}

.sidebar-section-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.category-list,
.recent-posts {
    list-style: none;
}

.category-item,
.recent-post-item {
    margin-bottom: var(--spacing-sm);
}

.category-link,
.recent-post-link {
    color: var(--text-secondary);
    text-decoration: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm);
    border-radius: 4px;
    transition: var(--transition);
}

.category-link:hover,
.recent-post-link:hover {
    background: var(--bg-tertiary);
    color: var(--accent-color);
}

.recent-post-link {
    flex-direction: column;
    align-items: flex-start;
}

.recent-post-title {
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.recent-post-date {
    font-size: 0.8rem;
    color: var(--text-tertiary);
}

.category-count {
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

/* ===== Main Content ===== */
.main-content {
    flex: 1;
    min-width: 0;
    padding: var(--spacing-xl);
    min-height: 100vh;
}

/* ===== TOC Sidebar (Right) ===== */
.toc-sidebar {
    position: sticky;
    top: 0;
    right: 0;
    width: var(--toc-width);
    height: 100vh;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    overflow-y: auto;
    overflow-x: hidden;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    flex-shrink: 0;
}

.toc-container {
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    overflow-y: auto;
    flex: 1;
}

.toc-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.toc nav {
    font-size: 0.9rem;
}

.toc ul {
    list-style: none;
    padding-left: 0;
}

.toc ul ul {
    padding-left: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

.toc a {
    color: var(--text-secondary);
    text-decoration: none;
    display: block;
    padding: 0.25rem 0;
    transition: var(--transition);
    border-left: 2px solid transparent;
    padding-left: var(--spacing-sm);
}

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

.nav-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.nav-btn {
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-btn:hover {
    background: var(--bg-tertiary);
    color: var(--accent-color);
}

/* ===== Post Styles ===== */
.post-header {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--border-color);
}

.post-categories {
    margin-bottom: var(--spacing-md);
}

.post-category {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 4px;
    font-size: 0.85rem;
    margin-right: var(--spacing-sm);
    transition: var(--transition);
}

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

.post-title {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.post-meta {
    display: flex;
    gap: var(--spacing-md);
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.post-content {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-primary);
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6 {
    margin-top: 2rem;
    margin-bottom: 1rem;
    font-weight: 600;
    line-height: 1.3;
}

.post-content h1 { font-size: 2rem; }
.post-content h2 { font-size: 1.75rem; }
.post-content h3 { font-size: 1.5rem; }
.post-content h4 { font-size: 1.25rem; }

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

.post-content a {
    color: var(--link-color);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.post-content a:hover {
    color: var(--link-hover);
    border-bottom-color: var(--link-hover);
}

.post-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    margin: 1.5rem 0;
}

.post-content ul,
.post-content ol {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

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

.post-content blockquote {
    padding: 1rem 1.5rem;
    margin: 1.5rem 0;
    border-left: 4px solid var(--accent-color);
    background: var(--bg-secondary);
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

.post-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
}

.post-content th,
.post-content td {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    text-align: left;
}

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

/* Code Blocks */
.post-content pre {
    margin: 1.5rem 0;
    padding: 0;
    border-radius: var(--border-radius);
    background: var(--code-bg);
    border: 1px solid var(--code-border);
    overflow: hidden;
}

.post-content pre code {
    display: block;
    padding: 1.5rem;
    overflow-x: auto;
    background: transparent;
    border: none;
}

.post-content code {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9em;
    padding: 0.2em 0.4em;
    background: var(--code-bg);
    border-radius: 3px;
}

.post-content pre code {
    padding: 1.5rem;
}

/* Code Block Wrapper (for copy button and language label) */
.code-block-wrapper {
    position: relative;
    margin: 1.5rem 0;
}

.code-block-wrapper pre {
    margin: 0;
}

.code-language {
    position: absolute;
    top: 0.5rem;
    left: 1rem;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    font-weight: 600;
    z-index: 1;
}

.code-copy-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    padding: 0.5rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1;
}

.code-copy-btn:hover {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

.code-copy-btn.copied {
    background: #28a745;
    color: white;
    border-color: #28a745;
}

/* Post Footer */
.post-footer {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

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

.tags-label {
    font-weight: 600;
    color: var(--text-secondary);
}

.post-tag {
    padding: 0.25rem 0.75rem;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 4px;
    font-size: 0.85rem;
    transition: var(--transition);
}

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

/* Post Navigation */
.post-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.post-nav-item {
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    text-decoration: none;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.post-nav-item:hover {
    background: var(--bg-tertiary);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.post-nav-label {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    margin-bottom: 0.5rem;
}

.post-nav-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

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

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

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

.comments-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
}

/* ===== List Pages ===== */
.list-header {
    margin-bottom: var(--spacing-xl);
}

.list-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.list-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.post-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.post-item {
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

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

.post-item-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

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

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

.post-item-meta {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.post-item-separator {
    color: var(--text-tertiary);
}

.post-item-categories {
    display: flex;
    gap: 0.5rem;
}

.post-item-category {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

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

.post-item-summary {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.post-item-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.post-item-tag {
    padding: 0.25rem 0.5rem;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 4px;
    font-size: 0.8rem;
    transition: var(--transition);
}

.post-item-tag:hover {
    background: var(--accent-color);
    color: white;
}

.no-posts {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-secondary);
}

/* ===== Taxonomy Pages ===== */
.taxonomy-header {
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.taxonomy-meta {
    font-size: 0.9rem;
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-sm);
}

.taxonomy-type {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--bg-secondary);
    border-radius: 4px;
}

.taxonomy-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.taxonomy-count {
    color: var(--text-secondary);
}

.taxonomy-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.taxonomy-item {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.taxonomy-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.taxonomy-link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    color: var(--text-primary);
    text-decoration: none;
}

.taxonomy-name {
    font-weight: 600;
}

.taxonomy-count {
    font-size: 0.9rem;
    color: var(--text-tertiary);
    background: var(--bg-tertiary);
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
}

/* ===== Search Page ===== */
.search-page {
    max-width: 800px;
    margin: 0 auto;
}

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

.search-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
}

.search-box {
    position: relative;
    display: flex;
}

.search-input-main {
    flex: 1;
    padding: var(--spacing-md) 3rem var(--spacing-md) var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1.1rem;
}

.search-btn-main {
    position: absolute;
    right: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-md);
}

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

.search-count {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.search-results-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.search-result-item {
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
}

.search-result-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

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

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

.search-result-meta {
    display: flex;
    gap: var(--spacing-sm);
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.search-result-content {
    color: var(--text-secondary);
    line-height: 1.6;
}

.search-result-content mark {
    background: var(--accent-color);
    color: white;
    padding: 0.1em 0.3em;
    border-radius: 2px;
}

/* ===== Responsive Design ===== */
@media (max-width: 1200px) {
    .container {
        grid-template-columns: var(--sidebar-width) 1fr;
    }

    .toc-sidebar {
        display: none;
    }

    .mobile-header .menu-toggle:last-child {
        display: flex;
    }

    .toc-sidebar.active {
        display: flex;
        position: fixed;
        right: 0;
        top: var(--header-height);
        bottom: 0;
        width: var(--toc-width);
        background: var(--bg-primary);
        border-left: 1px solid var(--border-color);
        padding: var(--spacing-lg);
        z-index: 999;
        overflow-y: auto;
    }
}

@media (max-width: 992px) {
    .mobile-header {
        display: flex;
    }

    .container {
        grid-template-columns: 1fr;
        padding-top: calc(var(--header-height) + var(--spacing-md));
    }

    .sidebar {
        display: none;
    }

    .sidebar.active {
        display: block;
        position: fixed;
        left: 0;
        top: var(--header-height);
        bottom: 0;
        width: var(--sidebar-width);
        background: var(--bg-primary);
        border-right: 1px solid var(--border-color);
        z-index: 999;
        overflow-y: auto;
    }

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

    .list-title,
    .taxonomy-title,
    .search-title {
        font-size: 2rem;
    }

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

@media (max-width: 768px) {
    .post-title {
        font-size: 1.75rem;
    }

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

    .post-content h1 { font-size: 1.75rem; }
    .post-content h2 { font-size: 1.5rem; }
    .post-content h3 { font-size: 1.25rem; }
    .post-content h4 { font-size: 1.1rem; }

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

@media (max-width: 576px) {
    :root {
        --sidebar-width: 250px;
        --toc-width: 220px;
    }

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

    .profile-image {
        width: 80px;
        height: 80px;
    }

    .post-title {
        font-size: 1.5rem;
    }

    .list-title,
    .taxonomy-title,
    .search-title {
        font-size: 1.5rem;
    }

    .code-block-wrapper {
        margin-left: calc(-1 * var(--spacing-md));
        margin-right: calc(-1 * var(--spacing-md));
    }
}