/* ==========================================================================
   PhamHai Developer Theme - Design System
   ~20KB minified | No framework | CSS Custom Properties
   ========================================================================== */

/* ---------- CSS Variables ---------- */
:root {
    /* Colors */
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-primary-light: #dbeafe;
    --color-accent: #f59e0b;
    --color-text: #1e293b;
    --color-text-secondary: #64748b;
    --color-text-muted: #94a3b8;
    --color-bg: #ffffff;
    --color-bg-secondary: #f8fafc;
    --color-bg-tertiary: #f1f5f9;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;
    --color-footer-bg: #0f172a;
    --color-footer-text: #cbd5e1;
    --color-footer-heading: #f1f5f9;
    --color-shadow: rgba(15, 23, 42, 0.08);
    --color-shadow-strong: rgba(15, 23, 42, 0.15);

    /* Typography */
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Noto Serif', Georgia, 'Times New Roman', serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;

    /* Layout */
    --container-width: 1200px;
    --container-narrow: 780px;
    --sidebar-width: 320px;
    --header-height: 64px;

    /* Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    /* Transitions */
    --transition: 0.2s ease;
    --transition-slow: 0.3s ease;
}

/* ---------- Dark Mode ---------- */
[data-theme="dark"] {
    --color-text: #e2e8f0;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;
    --color-bg: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-bg-tertiary: #334155;
    --color-border: #334155;
    --color-border-light: #1e293b;
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-shadow-strong: rgba(0, 0, 0, 0.5);
    --color-primary-light: #1e3a5f;
    --color-footer-bg: #020617;
}

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

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

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-text);
}

ul, ol {
    list-style: none;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
    color: inherit;
}

.screen-reader-text {
    clip: rect(1px, 1px, 1px, 1px);
    position: absolute;
    height: 1px;
    width: 1px;
    overflow: hidden;
}

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

.container--narrow {
    max-width: var(--container-narrow);
}

.content-area {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-3xl);
    padding: var(--space-2xl) 0;
}

.content-area.has-sidebar {
    grid-template-columns: 1fr var(--sidebar-width);
}

.site-main {
    min-height: calc(100vh - var(--header-height) - 300px);
}

/* ---------- Header ---------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--color-bg);
    transition: box-shadow var(--transition-slow), background var(--transition-slow);
}

.site-header.scrolled {
    box-shadow: 0 2px 16px var(--color-shadow);
}

/* Top bar: Logo + Tools */
.header-top {
    border-bottom: 1px solid var(--color-border);
}

.header-top__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 52px;
}

.site-header__brand .site-title {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

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

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

/* Header Tools */
.site-header__tools {
    display: flex;
    align-items: center;
    gap: 6px;
}

.header-tool {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    transition: all var(--transition);
}

.header-tool:hover {
    color: var(--color-primary);
    background: var(--color-primary-light);
}

/* Dark mode icons */
.dark-toggle .icon-moon { display: none; }
[data-theme="dark"] .dark-toggle .icon-sun { display: none; }
[data-theme="dark"] .dark-toggle .icon-moon { display: block; }

/* Language Switcher */
.lang-switch {
    width: auto;
    padding: 0 8px;
    gap: 4px;
    font-size: 0.78rem;
    font-weight: 600;
    text-decoration: none;
}

.lang-flag {
    font-size: 1rem;
    line-height: 1;
}

.lang-code {
    color: var(--color-text-secondary);
}

.lang-switch:hover .lang-code {
    color: var(--color-primary);
}

/* Hamburger */
.mobile-toggle {
    display: none;
}

.hamburger {
    display: flex;
    flex-direction: column;
    gap: 5px;
    width: 20px;
}

.hamburger span {
    display: block;
    height: 2px;
    background: currentColor;
    border-radius: 2px;
    transition: all var(--transition);
}

.mobile-toggle[aria-expanded="true"] .hamburger span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.mobile-toggle[aria-expanded="true"] .hamburger span:nth-child(2) {
    opacity: 0;
}
.mobile-toggle[aria-expanded="true"] .hamburger span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Bottom bar: Navigation */
.header-nav {
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg);
}

/* Navigation */
.site-nav .nav-menu {
    display: flex;
    align-items: stretch;
    gap: 0;
    margin: 0;
    padding: 0;
}

.site-nav .nav-menu > li {
    position: relative;
}

.site-nav .nav-menu > li > a {
    display: flex;
    align-items: center;
    height: 42px;
    padding: 0 14px;
    font-size: 0.835rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--transition);
    white-space: nowrap;
    position: relative;
}

.site-nav .nav-menu > li > a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 14px;
    right: 14px;
    height: 2px;
    background: var(--color-primary);
    transform: scaleX(0);
    transition: transform var(--transition);
}

.site-nav .nav-menu > li > a:hover,
.site-nav .nav-menu > li.current-menu-item > a {
    color: var(--color-primary);
}

.site-nav .nav-menu > li > a:hover::after,
.site-nav .nav-menu > li.current-menu-item > a::after {
    transform: scaleX(1);
}

/* Parent items with children - chevron */
.site-nav .nav-menu > li.menu-item-has-children > a .nav-chevron,
.site-nav .nav-menu > li.mega-has-mega > a .nav-chevron {
    display: inline-block;
    margin-left: 3px;
    transition: transform var(--transition);
    vertical-align: middle;
}

.site-nav .nav-menu > li.menu-item-has-children:hover > a .nav-chevron,
.site-nav .nav-menu > li.mega-has-mega:hover > a .nav-chevron {
    transform: rotate(180deg);
}

/* Dropdown sub-menu */
.site-nav .nav-menu .sub-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 210px;
    padding: 6px 0;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    opacity: 0;
    visibility: hidden;
    transform: translateY(6px);
    transition: all 0.2s ease;
    z-index: 1000;
    list-style: none;
    display: flex;
    flex-direction: column;
}

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

.site-nav .nav-menu .sub-menu li a {
    display: block;
    padding: 7px 16px;
    font-size: 0.82rem;
    font-weight: 400;
    color: var(--color-text-secondary);
    border-radius: 0;
    transition: all var(--transition);
}

.site-nav .nav-menu .sub-menu li a:hover {
    color: var(--color-primary);
    background: var(--color-primary-light);
}

/* ===== MEGA MENU ===== */
.site-nav .nav-menu > li.mega-has-mega {
    position: static;
}

.site-nav .nav-menu > li.mega-has-mega > .mega-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    width: 100%;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 12px 36px rgba(0, 0, 0, 0.08);
    opacity: 0;
    visibility: hidden;
    transform: translateY(4px);
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 999;
    padding: 0;
}

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

.mega-menu__inner {
    display: grid;
    gap: 0;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-lg) var(--space-lg);
}

/* Column count variants */
.mega-cols-2 .mega-menu__inner { grid-template-columns: repeat(2, 1fr); }
.mega-cols-3 .mega-menu__inner { grid-template-columns: repeat(3, 1fr); }
.mega-cols-4 .mega-menu__inner { grid-template-columns: repeat(4, 1fr); }
.mega-cols-5 .mega-menu__inner { grid-template-columns: repeat(5, 1fr); }
.mega-cols-6 .mega-menu__inner { grid-template-columns: repeat(6, 1fr); }

/* Column */
.mega-menu__col {
    padding: var(--space-sm) var(--space-md);
    border-left: 1px solid var(--color-border-light);
}

.mega-menu__col:first-child {
    border-left: none;
}

/* Column heading */
.mega-menu__heading {
    display: block;
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--color-text);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0 0 var(--space-xs) 0;
    margin-bottom: var(--space-xs);
    border-bottom: 1px solid var(--color-border-light);
    transition: color var(--transition);
}

.mega-menu__heading:hover {
    color: var(--color-primary);
}

/* Links list */
.mega-menu__links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.mega-menu__links li {
    margin: 0;
}

.mega-menu__links li a {
    display: block;
    padding: 4px 0;
    font-size: 0.795rem;
    font-weight: 400;
    color: var(--color-text-secondary);
    transition: color var(--transition), padding-left var(--transition);
    position: relative;
}

.mega-menu__links li a:hover {
    color: var(--color-primary);
    padding-left: 6px;
}

/* Mega backdrop overlay */
.mega-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.12);
    z-index: 998;
    pointer-events: none;
}

.mega-backdrop.active {
    display: block;
}

/* Search Overlay */
.search-overlay {
    display: none;
    background: var(--color-bg-secondary);
    padding: var(--space-lg) 0;
    border-top: 1px solid var(--color-border);
}

.search-overlay.active {
    display: block;
}

.search-form {
    display: flex;
    gap: var(--space-sm);
    max-width: 600px;
    margin: 0 auto;
}

.search-form__input {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-text);
    outline: none;
    transition: border-color var(--transition);
}

.search-form__input:focus {
    border-color: var(--color-primary);
}

.search-form__submit {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm) var(--space-md);
    background: var(--color-primary);
    color: white;
    border-radius: var(--radius-sm);
    transition: background var(--transition);
}

.search-form__submit:hover {
    background: var(--color-primary-dark);
}

/* ---------- Hero Post ---------- */
.hero-post {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--space-2xl);
    align-items: center;
    margin-bottom: var(--space-3xl);
    padding-bottom: var(--space-3xl);
    border-bottom: 1px solid var(--color-border);
}

.hero-post__image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: block;
}

.hero-post__image img {
    width: 100%;
    aspect-ratio: 16/10;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.hero-post__image:hover img {
    transform: scale(1.03);
}

.hero-post__category {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    background: var(--color-primary);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-md);
}

.hero-post__title {
    font-size: 2rem;
    margin-bottom: var(--space-md);
}

.hero-post__title a {
    color: var(--color-text);
}

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

.hero-post__meta {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

.meta-sep {
    color: var(--color-text-muted);
}

.hero-post__excerpt {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
}

.hero-post__readmore {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--color-primary);
    transition: gap var(--transition);
}

.hero-post__readmore:hover {
    gap: var(--space-md);
}

/* ---------- Blog Grid ---------- */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-2xl);
}

.post-card {
    display: flex;
    flex-direction: column;
    background: var(--color-bg);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: all var(--transition-slow);
}

.post-card:hover {
    box-shadow: 0 8px 30px var(--color-shadow);
    transform: translateY(-2px);
    border-color: transparent;
}

.post-card__image {
    display: block;
    overflow: hidden;
}

.post-card__image img {
    width: 100%;
    aspect-ratio: 3/2;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

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

.post-card__body {
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    flex: 1;
}

.post-card__category {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

.post-card__title {
    font-size: 1.15rem;
    margin-bottom: var(--space-sm);
    line-height: 1.4;
}

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

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

.post-card__meta {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

.post-card__excerpt {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    flex: 1;
    margin-bottom: var(--space-md);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.post-card__readmore {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-primary);
}

.post-card__readmore:hover {
    gap: var(--space-sm);
}

/* ---------- Pagination ---------- */
.pagination {
    padding: var(--space-2xl) 0;
}

.pagination__inner {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
}

.pagination__link {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 var(--space-sm);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: all var(--transition);
}

.pagination__link:hover {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

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

.pagination__dots {
    color: var(--color-text-muted);
    padding: 0 var(--space-xs);
}

/* ---------- Single Post ---------- */
.single-post__header {
    padding: var(--space-3xl) 0 var(--space-xl);
    text-align: center;
}

.single-post__category {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    background: var(--color-primary);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-lg);
}

.single-post__title {
    font-size: 2.5rem;
    max-width: 720px;
    margin: 0 auto var(--space-lg);
}

.single-post__meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.single-post__author {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.single-post__author img {
    border-radius: var(--radius-full);
}

.single-post__featured {
    margin-bottom: var(--space-2xl);
}

.single-post__featured img {
    width: 100%;
    max-height: 500px;
    object-fit: cover;
    border-radius: var(--radius-lg);
}

.single-post__body {
    padding-bottom: var(--space-2xl);
}

/* Post Content / Entry Content */
.post-content {
    font-size: 1.05rem;
    line-height: 1.8;
}

.post-content h2 {
    font-size: 1.6rem;
    margin: var(--space-2xl) 0 var(--space-md);
    padding-top: var(--space-md);
}

.post-content h3 {
    font-size: 1.3rem;
    margin: var(--space-xl) 0 var(--space-md);
}

.post-content h4 {
    font-size: 1.1rem;
    margin: var(--space-lg) 0 var(--space-sm);
}

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

.post-content ul, .post-content ol {
    margin: 0 0 var(--space-lg) var(--space-xl);
}

.post-content ul { list-style: disc; }
.post-content ol { list-style: decimal; }

.post-content li {
    margin-bottom: var(--space-sm);
}

.post-content blockquote {
    border-left: 4px solid var(--color-primary);
    padding: var(--space-md) var(--space-xl);
    margin: var(--space-xl) 0;
    background: var(--color-bg-secondary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-style: italic;
    color: var(--color-text-secondary);
}

.post-content pre {
    background: var(--color-bg-tertiary);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: var(--space-lg) 0;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* Code Copy Button */
.code-block-wrapper {
    position: relative;
}

.code-copy-btn {
    position: absolute;
    top: var(--space-sm);
    right: var(--space-sm);
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 5px 10px;
    font-size: 0.75rem;
    font-family: var(--font-body);
    font-weight: 500;
    color: var(--color-text-secondary);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    opacity: 0;
    transition: all var(--transition);
    z-index: 2;
}

.code-block-wrapper:hover .code-copy-btn {
    opacity: 1;
}

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

.code-copy-btn.copied {
    color: #22c55e;
    border-color: #22c55e;
    opacity: 1;
}

.post-content code {
    background: var(--color-bg-tertiary);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.88em;
}

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

.post-content img {
    border-radius: var(--radius-md);
    margin: var(--space-lg) 0;
}

.post-content a {
    text-decoration: underline;
    text-underline-offset: 3px;
}

.post-content table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-lg) 0;
}

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

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

/* ---------- Table of Contents ---------- */
.toc {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-2xl);
    overflow: hidden;
}

.toc:empty, .toc.toc--empty {
    display: none;
}

.toc__toggle {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-text);
    text-align: left;
}

.toc__chevron {
    margin-left: auto;
    transition: transform var(--transition);
}

.toc__toggle[aria-expanded="false"] .toc__chevron {
    transform: rotate(-90deg);
}

.toc__nav {
    padding: 0 var(--space-lg) var(--space-lg);
}

.toc__nav.collapsed {
    display: none;
}

.toc__nav ol {
    list-style: none;
    counter-reset: toc-counter;
}

.toc__nav ol li {
    counter-increment: toc-counter;
}

.toc__nav ol li a {
    display: block;
    padding: var(--space-xs) 0;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    transition: color var(--transition);
}

.toc__nav ol li a::before {
    content: counter(toc-counter) ". ";
    color: var(--color-primary);
    font-weight: 600;
}

.toc__nav ol li a:hover,
.toc__nav ol li a.active {
    color: var(--color-primary);
}

.toc__nav ol ol {
    padding-left: var(--space-lg);
}

/* ---------- Categories ---------- */
.single-post__categories {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-sm);
    margin: var(--space-2xl) 0 0;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border);
}

.single-post__categories-label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text-secondary);
}

.category-badge {
    display: inline-block;
    padding: 5px 14px;
    background: var(--color-primary-light);
    color: var(--color-primary);
    font-size: 0.82rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    border: 1px solid transparent;
    transition: all var(--transition);
}

.category-badge:hover {
    background: var(--color-primary);
    color: #fff;
    transform: translateY(-1px);
}

/* ---------- Tags ---------- */
.single-post__tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin: var(--space-lg) 0 var(--space-2xl);
}

.tag-link {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    background: var(--color-bg-secondary);
    color: var(--color-text-secondary);
    font-size: 0.85rem;
    border-radius: var(--radius-full);
    transition: all var(--transition);
}

.tag-link:hover {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

/* ---------- Social Share ---------- */
.social-share {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-wrap: wrap;
    margin: var(--space-xl) 0;
    padding: var(--space-lg);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
}

.social-share__label {
    font-weight: 600;
    font-size: 0.9rem;
}

.social-share__btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    font-size: 0.85rem;
    font-weight: 500;
    color: white;
    border-radius: var(--radius-sm);
    transition: opacity var(--transition);
}

.social-share__btn:hover {
    opacity: 0.85;
    color: white;
}

.social-share__btn--fb { background: #1877f2; }
.social-share__btn--tw { background: #0f1419; }
.social-share__btn--li { background: #0a66c2; }

/* ---------- Author Box ---------- */
.author-box {
    background: var(--color-bg-secondary);
    padding: var(--space-2xl) 0;
    margin: var(--space-xl) 0;
}

.author-box__inner {
    display: flex;
    gap: var(--space-xl);
    align-items: center;
}

.author-box__inner img {
    border-radius: var(--radius-full);
    width: 80px;
    height: 80px;
    flex-shrink: 0;
}

.author-box__name {
    font-size: 1.1rem;
    margin-bottom: var(--space-xs);
}

.author-box__bio {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

/* ---------- Related Posts ---------- */
.related-posts {
    padding: var(--space-3xl) 0;
    background: var(--color-bg-secondary);
}

.related-posts__title {
    text-align: center;
    margin-bottom: var(--space-2xl);
    font-size: 1.5rem;
}

/* ---------- Breadcrumbs ---------- */
.breadcrumbs {
    padding: var(--space-lg) 0;
}

.breadcrumbs__list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    font-size: 0.85rem;
}

.breadcrumbs__item {
    display: flex;
    align-items: center;
    color: var(--color-text-muted);
}

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

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

.breadcrumbs__item + .breadcrumbs__item::before {
    content: '/';
    margin-right: var(--space-xs);
    color: var(--color-text-muted);
}

/* ---------- Sidebar ---------- */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--space-2xl);
}

.widget {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-xl);
}

.widget-title {
    font-size: 0.9rem;
    font-family: var(--font-body);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--color-primary);
}

/* About Widget */
.about-widget {
    text-align: center;
}

.about-widget__avatar {
    width: 100px;
    height: 100px;
    border-radius: var(--radius-full);
    object-fit: cover;
    margin: 0 auto var(--space-md);
}

.about-widget__name {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    margin-bottom: var(--space-sm);
}

.about-widget__bio {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
}

.about-widget__socials {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
}

.about-widget__socials a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: var(--color-bg-secondary);
    color: var(--color-text-secondary);
    transition: all var(--transition);
}

.about-widget__socials a:hover {
    background: var(--color-primary);
    color: white;
}

/* Popular Posts Widget */
.popular-posts {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.popular-posts__item {
    display: flex;
    gap: var(--space-md);
    align-items: center;
}

.popular-posts__thumb {
    flex-shrink: 0;
}

.popular-posts__thumb img {
    width: 80px;
    height: 56px;
    object-fit: cover;
    border-radius: var(--radius-sm);
}

.popular-posts__title {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--color-text);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.popular-posts__title:hover {
    color: var(--color-primary);
}

.popular-posts__date {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* Categories Widget */
.widget_categories ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.widget_categories ul li a {
    display: flex;
    justify-content: space-between;
    padding: var(--space-sm) 0;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    border-bottom: 1px solid var(--color-border-light);
}

.widget_categories ul li a:hover {
    color: var(--color-primary);
}

/* ---------- Footer ---------- */
/* --- Footer --- */
.site-footer {
    background: var(--color-footer-bg);
    color: var(--color-footer-text);
    position: relative;
}

.footer-decoration {
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), #8b5cf6, var(--color-accent));
}

.site-footer__main {
    padding: 3rem 0 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.3fr 0.8fr 1.2fr 1fr;
    gap: 2.5rem;
}

/* Footer Brand */
.footer-brand {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
    margin-bottom: var(--space-md);
}

.footer-brand__name {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-footer-heading);
    letter-spacing: -0.02em;
}

.footer-brand:hover .footer-brand__name {
    color: var(--color-primary);
}

.footer-brand .custom-logo {
    max-height: 36px;
    width: auto;
}

.footer-brand__desc {
    font-size: 0.88rem;
    line-height: 1.7;
    color: var(--color-footer-text);
    margin-bottom: var(--space-lg);
    opacity: 0.85;
}

/* Footer Social Icons */
.footer-social {
    display: flex;
    gap: var(--space-sm);
}

.footer-social__link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    color: var(--color-footer-text);
    background: rgba(255, 255, 255, 0.06);
    transition: all var(--transition);
}

.footer-social__link:hover {
    color: #fff;
    background: var(--color-primary);
    transform: translateY(-2px);
}

/* Footer Column Titles */
.footer-col__title {
    font-family: var(--font-body);
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-footer-heading);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--color-primary);
    display: inline-block;
}

/* Footer Links (Quick Links) */
.footer-links {
    display: flex;
    flex-direction: column;
    gap: 2px;
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li a {
    display: block;
    font-size: 0.88rem;
    padding: 5px 0;
    color: var(--color-footer-text);
    transition: all var(--transition);
}

.footer-links li a:hover {
    color: var(--color-primary);
    padding-left: 6px;
}

/* Footer Categories (2 columns) */
.footer-categories {
    columns: 2;
    column-gap: var(--space-lg);
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-categories li {
    break-inside: avoid;
    margin-bottom: 2px;
}

.footer-categories li a {
    display: block;
    font-size: 0.88rem;
    padding: 5px 0;
    color: var(--color-footer-text);
    transition: all var(--transition);
}

.footer-categories li a:hover {
    color: var(--color-primary);
    padding-left: 6px;
}

/* Footer Contact */
.footer-contact {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.footer-contact li {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    font-size: 0.88rem;
    color: var(--color-footer-text);
}

.footer-contact li svg {
    flex-shrink: 0;
    margin-top: 2px;
    opacity: 0.6;
}

.footer-contact li a {
    color: var(--color-footer-text);
    transition: color var(--transition);
}

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

/* Footer Bottom */
.site-footer__bottom {
    padding: var(--space-lg) 0;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    text-align: center;
    font-size: 0.82rem;
    opacity: 0.7;
}

/* ---------- Archive Header ---------- */
.archive-header {
    padding: var(--space-xl) 0;
    margin-bottom: var(--space-md);
}

.archive-header__title {
    font-size: 1.8rem;
}

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

/* ---------- 404 Page ---------- */
.page-404 {
    text-align: center;
    padding: var(--space-3xl) 0;
    min-height: 50vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.page-404__code {
    font-size: 8rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
    margin-bottom: var(--space-md);
}

.page-404__title {
    font-size: 1.8rem;
    margin-bottom: var(--space-md);
}

.page-404__desc {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
    max-width: 500px;
}

.page-404__search {
    margin-top: var(--space-xl);
    width: 100%;
    max-width: 500px;
}

/* ---------- Comments ---------- */
.comments-area {
    padding: var(--space-2xl) 0;
}

.comments-title {
    font-size: 1.3rem;
    margin-bottom: var(--space-xl);
}

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

.comment-list .comment {
    padding: var(--space-lg);
    margin-bottom: var(--space-md);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
}

.comment-list .comment .comment-author img {
    border-radius: var(--radius-full);
    float: left;
    margin-right: var(--space-md);
}

.comment-respond {
    margin-top: var(--space-2xl);
}

.comment-form label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--space-xs);
    font-size: 0.9rem;
}

.comment-form input[type="text"],
.comment-form input[type="email"],
.comment-form input[type="url"],
.comment-form textarea {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-size: 0.95rem;
    background: var(--color-bg);
    color: var(--color-text);
    transition: border-color var(--transition);
    margin-bottom: var(--space-md);
}

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

.comment-form textarea {
    min-height: 150px;
    resize: vertical;
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-xl);
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    cursor: pointer;
    border: none;
    font-family: var(--font-body);
}

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

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

.comment-form .submit {
    background: var(--color-primary);
    color: white;
    padding: var(--space-sm) var(--space-xl);
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    font-family: var(--font-body);
    transition: background var(--transition);
}

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

/* ---------- Back to Top ---------- */
.back-to-top {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary);
    color: white;
    border-radius: var(--radius-full);
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-slow);
    z-index: 999;
}

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

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

/* ---------- WordPress Specific ---------- */
.wp-caption {
    max-width: 100%;
}

.wp-caption-text {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    text-align: center;
    margin-top: var(--space-sm);
}

.alignleft {
    float: left;
    margin-right: var(--space-lg);
    margin-bottom: var(--space-md);
}

.alignright {
    float: right;
    margin-left: var(--space-lg);
    margin-bottom: var(--space-md);
}

.aligncenter {
    display: block;
    margin: var(--space-lg) auto;
}

/* ---------- Content None ---------- */
.content-none {
    text-align: center;
    padding: var(--space-3xl) 0;
}

.content-none h2 {
    margin-bottom: var(--space-md);
}

.content-none p {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
}

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

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

    .blog-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-xl);
    }

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

    .footer-col--brand {
        grid-column: span 2;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 52px;
    }

    /* Hide nav bar on mobile, show via toggle */
    .header-nav {
        display: none;
        position: fixed;
        top: 52px;
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--color-bg);
        z-index: 999;
        overflow-y: auto;
        border-bottom: none;
    }

    .header-nav.active {
        display: block;
    }

    .site-nav .nav-menu {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: var(--space-sm) 0;
    }

    .site-nav .nav-menu > li {
        border-bottom: 1px solid var(--color-border-light);
    }

    .site-nav .nav-menu > li > a {
        height: auto;
        padding: var(--space-md) var(--space-lg);
        font-size: 0.95rem;
    }

    .site-nav .nav-menu > li > a::after {
        display: none;
    }

    /* Mobile chevron toggle tap target */
    .site-nav .nav-menu > li > a .nav-chevron {
        float: right;
        margin-top: 2px;
    }

    /* Mobile: mega menu as accordion */
    .site-nav .nav-menu > li.mega-has-mega {
        position: relative;
    }

    .site-nav .nav-menu > li.mega-has-mega > .mega-menu {
        position: relative;
        top: auto;
        left: auto;
        right: auto;
        width: 100%;
        box-shadow: none;
        border-bottom: none;
        opacity: 1;
        visibility: visible;
        transform: none;
        display: none;
        padding: 0;
        background: var(--color-bg-secondary);
    }

    .site-nav .nav-menu > li.mega-has-mega.mega-open > .mega-menu {
        display: block;
    }

    .mega-menu__inner {
        grid-template-columns: 1fr !important;
        padding: var(--space-sm) var(--space-md);
        gap: 0;
    }

    .mega-menu__col {
        border-left: none;
        padding: var(--space-xs) 0;
    }

    .mega-menu__heading {
        font-size: 0.82rem;
        padding: var(--space-xs) 0;
        margin-bottom: var(--space-xs);
    }

    .mega-menu__links li a {
        padding: 5px 0 5px var(--space-sm);
        font-size: 0.82rem;
    }

    /* Mobile: regular sub-menu as accordion */
    .site-nav .nav-menu .sub-menu {
        position: relative;
        top: auto;
        left: auto;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: none;
        border-radius: 0;
        padding: 0 0 0 var(--space-md);
        display: none;
        background: var(--color-bg-secondary);
    }

    .site-nav .nav-menu > li.sub-open > .sub-menu {
        display: flex;
    }

    .site-nav .nav-menu .sub-menu li a {
        padding: 8px 12px;
        font-size: 0.9rem;
    }

    .mobile-toggle {
        display: flex;
    }

    .mega-backdrop {
        display: none !important;
    }

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

    .hero-post__title {
        font-size: 1.5rem;
    }

    .single-post__title {
        font-size: 1.8rem;
    }

    .single-post__meta {
        flex-wrap: wrap;
        justify-content: center;
    }

    .social-share {
        flex-direction: column;
        align-items: stretch;
    }

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

    .author-box__inner {
        flex-direction: column;
        text-align: center;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }

    .footer-col--brand {
        grid-column: span 1;
    }

    .footer-categories {
        columns: 2;
    }

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

    .related-posts .blog-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-post__title {
        font-size: 1.3rem;
    }

    .single-post__title {
        font-size: 1.5rem;
    }

    .post-content h2 {
        font-size: 1.3rem;
    }

    .post-content h3 {
        font-size: 1.15rem;
    }

    .page-404__code {
        font-size: 5rem;
    }
}

/* ---------- Print ---------- */
@media print {
    .site-header, .site-footer, .sidebar, .social-share,
    .back-to-top, .toc, .related-posts, .comments-area,
    .breadcrumbs, .pagination {
        display: none;
    }

    body {
        font-size: 12pt;
        color: #000;
        background: #fff;
    }

    .container, .container--narrow {
        max-width: 100%;
    }
}