/* === Keonhacai Modern Professional Theme === */

/* --- 1. Design System --- */
:root {
    /* Brand Colors - Sport Betting Theme */
    --brand-primary: #1890ff;
    --brand-primary-hover: #40a9ff;
    --brand-primary-active: #096dd9;
    --brand-secondary: #52c41a;
    --brand-danger: #ff4d4f;
    --brand-success: #389e0d;
    --brand-warning: #fa8c16;
    --brand-gold: #faad14;

    /* Neutral Colors */
    --neutral-1: #ffffff;
    --neutral-2: #fafafa;
    --neutral-3: #e5f0fd;
    --neutral-4: #f0f0f0;
    --neutral-5: #d9d9d9;
    --neutral-6: #bfbfbf;
    --neutral-7: #8c8c8c;
    --neutral-8: #595959;
    --neutral-9: #434343;
    --neutral-10: #262626;
    --neutral-11: #1f1f1f;
    --neutral-12: #141414;

    /* Text Colors */
    --text-primary: rgba(0, 0, 0, 0.88);
    --text-secondary: rgba(0, 0, 0, 0.65);
    --text-tertiary: rgba(0, 0, 0, 0.45);
    --text-quaternary: rgba(0, 0, 0, 0.25);

    /* Border Colors */
    --border-color: #e8e8e8;
    --border-color-split: #f0f0f0;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.03), 0 1px 6px -1px rgba(0, 0, 0, 0.02), 0 2px 4px 0 rgba(0, 0, 0, 0.02);
    --shadow-base: 0 1px 2px -2px rgba(0, 0, 0, 0.16), 0 3px 6px 0 rgba(0, 0, 0, 0.12), 0 5px 12px 4px rgba(0, 0, 0, 0.09);
    --shadow-md: 0 3px 6px -4px rgba(0, 0, 0, 0.12), 0 6px 16px 0 rgba(0, 0, 0, 0.08), 0 9px 28px 8px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 6px 16px -8px rgba(0, 0, 0, 0.08), 0 9px 28px 0 rgba(0, 0, 0, 0.05), 0 12px 48px 16px rgba(0, 0, 0, 0.03);

    /* Border Radius */
    --radius-sm: 4px;
    --radius-base: 6px;
    --radius-lg: 8px;

    /* Spacing */
    --space-xs: 8px;
    --space-sm: 12px;
    --space-md: 16px;
    --space-lg: 20px;
    --space-xl: 24px;
    --space-xxl: 32px;
    --space-xxxl: 48px;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    --font-size-sm: 12px;
    --font-size-base: 14px;
    --font-size-md: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-xxl: 24px;
    --font-size-xxxl: 30px;
    --line-height-base: 1.6;
    --line-height-heading: 1.4;

    /* Layout */
    --container-max-width: 1200px;
    --header-height: 64px;
    --sidebar-width: 280px;

    /* Transitions */
    --transition-fast: all 0.2s cubic-bezier(0.645, 0.045, 0.355, 1);
    --transition-base: all 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
}

/* --- 2. Reset & Base --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: var(--font-size-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--text-primary);
    background-color: var(--neutral-3);
}

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

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

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

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

/* --- 3. Header & Navigation --- */
.site-header {
    background: linear-gradient(135deg, #1f1f1f 0%, #2a2a2a 100%);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-top {
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.site-branding a {
    display: flex;
    align-items: center;
}

.site-branding .site-logo {
    max-height: 50px;
    width: auto;
    display: block;
}

.site-branding .site-title {
    font-size: var(--font-size-xxl);
    font-weight: 700;
    background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-gold) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
    transition: var(--transition-fast);
}

.site-branding .site-title:hover {
    opacity: 0.85;
}

/* Search */
.header-search {
    display: flex;
    width: 360px;
}

.header-search input {
    flex: 1;
    height: 38px;
    padding: 0 15px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-right: none;
    border-radius: var(--radius-base) 0 0 var(--radius-base);
    font-size: var(--font-size-base);
    color: rgba(255, 255, 255, 0.9);
    background: rgba(255, 255, 255, 0.08);
    transition: var(--transition-fast);
}

.header-search input:focus {
    outline: none;
    border-color: var(--brand-primary);
    background: rgba(255, 255, 255, 0.12);
    box-shadow: 0 0 0 2px rgba(24, 144, 255, 0.2);
}

.header-search input::placeholder {
    color: rgba(255, 255, 255, 0.4);
}

.header-search button {
    height: 38px;
    padding: 0 20px;
    border: none;
    border-radius: 0 var(--radius-base) var(--radius-base) 0;
    background: var(--brand-primary);
    color: white;
    font-size: var(--font-size-base);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}

.header-search button:hover {
    background: var(--brand-primary-hover);
}

.header-search button:active {
    background: var(--brand-primary-active);
}

/* Navigation */
.header-bottom {
    background: rgba(0, 0, 0, 0.2);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.main-navigation {
    height: 50px;
}

.nav-menu {
    display: flex;
    list-style: none;
    height: 100%;
}

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

.nav-menu > li > a {
    display: flex;
    align-items: center;
    height: 50px;
    padding: 0 var(--space-lg);
    font-size: var(--font-size-base);
    font-weight: 500;
    color: rgba(255, 255, 255, 0.85);
    transition: var(--transition-fast);
    position: relative;
}

.nav-menu > li > a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: var(--space-lg);
    right: var(--space-lg);
    height: 3px;
    background: linear-gradient(to right, var(--brand-primary), var(--brand-gold));
    transform: scaleX(0);
    transition: var(--transition-fast);
}

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

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

/* Dropdown indicator */
.nav-menu .indicator {
    display: inline-block;
    width: 0;
    height: 0;
    margin-left: 6px;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 5px solid rgba(255, 255, 255, 0.6);
    transition: var(--transition-fast);
}

.nav-menu li:hover .indicator {
    transform: rotate(180deg);
    border-top-color: var(--brand-gold);
}

/* Dropdown menu */
.nav-menu .sub-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background: #2a2a2a;
    border-radius: var(--radius-base);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    list-style: none;
    margin-top: 0;
    padding: var(--space-sm) 0;
    animation: slideDown 0.2s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Small triangle at the top */
.nav-menu .sub-menu::before {
    content: '';
    position: absolute;
    top: -6px;
    left: 20px;
    width: 0;
    height: 0;
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-bottom: 6px solid #2a2a2a;
}

.nav-menu .sub-menu::after {
    content: '';
    position: absolute;
    top: -7px;
    left: 19px;
    width: 0;
    height: 0;
    border-left: 7px solid transparent;
    border-right: 7px solid transparent;
    border-bottom: 7px solid rgba(255, 255, 255, 0.1);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-4px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.nav-menu li:hover > .sub-menu {
    display: block;
}

.nav-menu .sub-menu a {
    display: block;
    padding: 11px var(--space-lg);
    font-size: var(--font-size-base);
    color: rgba(255, 255, 255, 0.8);
    transition: var(--transition-fast);
    border-left: 3px solid transparent;
}

.nav-menu .sub-menu a:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--brand-gold);
    border-left-color: var(--brand-primary);
}

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

.mobile-menu-toggle .hamburger {
    position: relative;
    display: block;
    width: 24px;
    height: 2px;
    background: rgba(255, 255, 255, 0.9);
    transition: var(--transition-fast);
}

.mobile-menu-toggle .hamburger::before,
.mobile-menu-toggle .hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: rgba(255, 255, 255, 0.9);
    transition: var(--transition-fast);
}

.mobile-menu-toggle .hamburger::before {
    top: -7px;
}

.mobile-menu-toggle .hamburger::after {
    top: 7px;
}

.mobile-menu-toggle.is-active .hamburger {
    background: transparent;
}

.mobile-menu-toggle.is-active .hamburger::before {
    top: 0;
    transform: rotate(45deg);
    background: var(--brand-gold);
}

.mobile-menu-toggle.is-active .hamburger::after {
    top: 0;
    transform: rotate(-45deg);
    background: var(--brand-gold);
}

/* Mobile drawer */
.mobile-drawer {
    position: fixed;
    top: 0;
    left: -300px;
    width: 300px;
    height: 100%;
    background: linear-gradient(135deg, #1f1f1f 0%, #2a2a2a 100%);
    z-index: 1100;
    transition: transform 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
    overflow-y: auto;
    padding-top: var(--header-height);
}

.mobile-drawer.is-open {
    transform: translateX(300px);
}

.drawer-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1099;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-base);
}

.drawer-overlay.is-visible {
    opacity: 1;
    visibility: visible;
}

.mobile-navigation ul {
    list-style: none;
}

.mobile-navigation ul li a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    color: rgba(255, 255, 255, 0.85);
    font-weight: 500;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    transition: var(--transition-fast);
    border-left: 3px solid transparent;
}

.mobile-navigation ul li a:hover,
.mobile-navigation ul li.current-menu-item > a {
    background: rgba(255, 255, 255, 0.08);
    color: var(--brand-gold);
    border-left-color: var(--brand-primary);
}

.mobile-navigation .sub-menu {
    display: none;
    background: rgba(0, 0, 0, 0.3);
}

.mobile-navigation .submenu-open > .sub-menu {
    display: block;
}

.mobile-navigation .sub-menu a {
    padding-left: var(--space-xxxl);
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.7);
}

.mobile-navigation .indicator-mobile {
    font-style: normal;
    font-weight: bold;
    color: var(--brand-gold);
}

/* --- 4. Main Content --- */
.page-content {
    padding: var(--space-xl) 0 var(--space-xxxl);
}

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

@media (min-width: 992px) {
    .main-grid {
        grid-template-columns: var(--sidebar-width) 1fr;
    }

    .main-grid-reverse {
        grid-template-columns: 1fr var(--sidebar-width);
    }
}

/* Page header */
.page-header {
    margin-bottom: var(--space-xl);
}

.page-header h1 {
    font-size: var(--font-size-xxl);
    font-weight: 700;
    line-height: var(--line-height-heading);
    color: var(--text-primary);
    margin-bottom: var(--space-xl);
    position: relative;
    display: flex;
    align-items: center;
    text-align: center;
    gap: 1.5rem;
}

.page-header h1::before,
.page-header h1::after {
    content: '';
    flex: 1;
    height: 2px;
    background: linear-gradient(to right, transparent, var(--brand-primary) 20%, var(--brand-gold) 80%, transparent);
}

.page-header h1::before {
    background: linear-gradient(to right, transparent, var(--brand-gold) 20%, var(--brand-primary) 80%);
}

/* Breadcrumbs */
.breadcrumbs {
    margin-bottom: var(--space-xl);
    padding: var(--space-sm) 0;
}

.breadcrumbs ol {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    list-style: none;
    font-size: var(--font-size-sm);
}

.breadcrumbs li {
    display: flex;
    align-items: center;
}

.breadcrumbs li:not(:last-child)::after {
    content: '';
    display: inline-block;
    width: 5px;
    height: 5px;
    margin: 0 var(--space-sm);
    border-top: 1.5px solid var(--text-quaternary);
    border-right: 1.5px solid var(--text-quaternary);
    transform: rotate(45deg);
    opacity: 0.5;
}

.breadcrumbs a {
    color: var(--text-tertiary);
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
    font-weight: 500;
}

.breadcrumbs a:hover {
    color: var(--brand-primary);
    background: rgba(24, 144, 255, 0.06);
}

.breadcrumbs [aria-current="page"] {
    color: var(--text-primary);
    font-weight: 600;
    padding: 4px 8px;
}

.breadcrumb-home-icon {
    display: inline-block;
    vertical-align: middle;
    margin-right: 4px;
    margin-top: -2px;
    transition: var(--transition-fast);
}

.breadcrumbs a:hover .breadcrumb-home-icon {
    transform: translateY(-1px);
    stroke: var(--brand-primary);
}

/* Category description */
.category-description {
    padding: var(--space-md);
    background: var(--neutral-2);
    border-radius: var(--radius-base);
    border-left: 3px solid var(--brand-primary);
    color: var(--text-secondary);
    line-height: 1.7;
}

.category-description figure {
    margin: var(--space-lg) 0;
    text-align: center;
}

.category-description figure img {
    margin: 0;
    border-radius: var(--radius-base);
    max-width: 100%;
    height: auto;
}

.category-description figcaption {
    margin-top: var(--space-sm);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-style: italic;
    text-align: center;
    line-height: 1.6;
    padding: 0 var(--space-md);
}

/* --- 5. Sidebar --- */
.sidebar-widget-area {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.widget {
    background: var(--neutral-1);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: var(--transition-base);
    position: relative;
}

.widget::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(to bottom, var(--brand-primary), #722ed1);
    opacity: 0.8;
    transition: var(--transition-fast);
}

.widget:hover {
    border-color: var(--border-color-split);
    box-shadow: var(--shadow-base);
    transform: translateY(-1px);
}

.widget:hover::before {
    opacity: 1;
}

.widget-title {
    padding: var(--space-lg) var(--space-lg) var(--space-md);
    padding-left: calc(var(--space-lg) + 12px);
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--text-primary);
    position: relative;
    letter-spacing: 0.3px;
}

.widget-title::after {
    content: '';
    position: absolute;
    bottom: 8px;
    left: calc(var(--space-lg) + 12px);
    width: 40px;
    height: 3px;
    background: linear-gradient(to right, var(--brand-primary), transparent);
    border-radius: 2px;
}

.widget ul {
    list-style: none;
    padding: var(--space-md) var(--space-md) var(--space-lg);
}

.widget ul li {
    position: relative;
}

.widget ul li a {
    display: flex;
    align-items: center;
    padding: 10px var(--space-md);
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
    position: relative;
}

.widget ul li a:hover {
    background: rgba(24, 144, 255, 0.05);
    color: var(--brand-primary);
}

/* --- 6. Article List --- */
/* Home Page Content - Container specific styles only */
.home-page-content {
    max-height: 600px;
    overflow-y: auto;
    overflow-x: hidden;
}

/* 美化滚动条 */
.home-page-content::-webkit-scrollbar {
    width: 8px;
}

.home-page-content::-webkit-scrollbar-track {
    background: var(--neutral-2);
    border-radius: 4px;
}

.home-page-content::-webkit-scrollbar-thumb {
    background: var(--neutral-5);
    border-radius: 4px;
    transition: var(--transition-fast);
}

.home-page-content::-webkit-scrollbar-thumb:hover {
    background: var(--brand-primary);
}

/* Home Articles Section Title */
.home-articles-section {
    margin-top: var(--space-xl);
    margin-bottom: var(--space-lg);
}

.home-articles-title {
    font-size: var(--font-size-xxl);
    font-weight: 700;
    line-height: var(--line-height-heading);
    color: var(--text-primary);
    position: relative;
    display: flex;
    align-items: center;
    text-align: center;
    gap: 1.5rem;
}

.home-articles-title::before,
.home-articles-title::after {
    content: '';
    flex: 1;
    height: 2px;
    background: linear-gradient(to right, transparent, var(--brand-primary) 20%, var(--brand-gold) 80%, transparent);
}

.home-articles-title::before {
    background: linear-gradient(to right, transparent, var(--brand-gold) 20%, var(--brand-primary) 80%);
}

/* Home Page Grid Layout */
.home-article-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-xs);
    margin-top: var(--space-lg);
}

.home-article-card {
    display: flex;
    flex-direction: column;
    background: var(--neutral-1);
    overflow: hidden;
    transition: var(--transition-base);
    position: relative;
}

.home-card-image {
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: var(--neutral-3);
}

.home-card-image a {
    display: block;
    width: 100%;
    height: 100%;
}

.home-card-image img {
    width: 100%;
    height: 100%;
    aspect-ratio: 16 / 9;
    transition: var(--transition-base);
}
.home-card-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: var(--space-lg);
}

.home-card-title {
    font-size: var(--font-size-md);
    font-weight: 600;
    line-height: 1.5;
    margin-bottom: var(--space-sm);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

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

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

.home-card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-sm);
    font-size: var(--font-size-sm);
}

.home-card-meta span {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    background: var(--neutral-2);
    border-radius: 12px;
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition-fast);
}

.home-card-meta span:first-child {
    background: linear-gradient(135deg, #e6f7ff 0%, #bae7ff 100%);
    color: var(--brand-primary);
}

.home-card-meta span a {
    color: inherit;
}

.home-card-meta span:hover {
    background: var(--neutral-3);
}

.home-card-meta span a:hover {
    color: var(--brand-primary);
}

.home-card-summary {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: var(--font-size-sm);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Default Article List (for other pages) */
.article-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.article-card-horizontal {
    display: flex;
    gap: var(--space-lg);
    background: var(--neutral-1);
    overflow: hidden;
    transition: var(--transition-base);
    position: relative;
}


.card-image {
    aspect-ratio: 16 / 9;
    width: 300px;
    flex-shrink: 0;
    overflow: hidden;
}

.card-image a {
    display: block;
    width: 100%;
    height: 100%;
}

.card-image img {
    width: 100%;
    aspect-ratio: 16 / 9;
    transition: var(--transition-base);
}


.card-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    /* padding: var(--space-lg); */
    padding-left: 0;
}

.card-content h3 {
    font-size: var(--font-size-xl);
    font-weight: 450;
    line-height: var(--line-height-heading);
    margin-bottom: var(--space-sm);
}

.card-content h3 a {
    color: var(--text-primary);
}

.card-content h3 a:hover {
    color: var(--brand-primary);
}

.card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
    font-size: var(--font-size-sm);
}

.card-meta span {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    background: var(--neutral-2);
    border-radius: 12px;
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition-fast);
}

.card-meta span:first-child {
    background: linear-gradient(135deg, #e6f7ff 0%, #bae7ff 100%);
    color: var(--brand-primary);
}

.card-meta span a {
    color: inherit;
}

.card-meta span:hover {
    background: var(--neutral-3);
}

.card-meta span a:hover {
    color: var(--brand-primary);
}

.card-summary {
    color: var(--text-secondary);
    line-height: 1.7;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* --- 7. Article Detail --- */
/* Table of Contents */
.toc-container {
    background: var(--neutral-1);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-base);
    padding: 0;
    margin-bottom: var(--space-xl);
    box-shadow: var(--shadow-sm);
}

.toc-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) var(--space-lg);
    background: var(--neutral-2);
    cursor: pointer;
    user-select: none;
    border-bottom: 1px solid var(--border-color);
}

.toc-container.collapsed .toc-header {
    border-bottom: none;
}

.toc-title {
    margin: 0;
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.toc-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    width: 24px;
    height: 24px;
    font-size: 20px;
    font-weight: bold;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
    line-height: 1;
}

.toc-toggle:hover {
    color: var(--brand-primary);
}

.toc-content {
    padding: var(--space-md) var(--space-lg);
    max-height: 500px;
    overflow-y: auto;
    transition: all 0.3s ease;
}

.toc-container.collapsed .toc-content {
    max-height: 0;
    padding: 0 var(--space-lg);
    overflow: hidden;
}

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

.toc-list li {
    margin: 0;
}

.toc-list a {
    display: block;
    padding: 8px 0;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition-fast);
    font-size: var(--font-size-sm);
    line-height: 1.5;
}

.toc-list a:hover {
    color: var(--brand-primary);
}

.toc-list a.active {
    color: var(--brand-primary);
    font-weight: 600;
}

.toc-number {
    color: var(--brand-primary);
    font-weight: 600;
    margin-right: 0.5em;
}

/* TOC H3 items indentation */
.toc-list li.toc-h3 a {
    padding-left: var(--space-lg);
}

/* TOC scrollbar */
.toc-content::-webkit-scrollbar {
    width: 4px;
}

.toc-content::-webkit-scrollbar-track {
    background: var(--neutral-2);
}

.toc-content::-webkit-scrollbar-thumb {
    background: var(--neutral-5);
    border-radius: 2px;
}

.toc-content::-webkit-scrollbar-thumb:hover {
    background: var(--brand-primary);
}

.article-detail {
    background: var(--neutral-1);
    padding: var(--space-xxxl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.article-detail .article-header {
    margin-bottom: var(--space-xxxl);
}

.article-detail .article-header h1 {
    font-size: 26px;
    font-weight: 700;
    line-height: var(--line-height-heading);
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
    position: relative;
    display: flex;
    align-items: center;
    text-align: center;
    gap: 1.5rem;
}

.article-detail .article-header h1::before,
.article-detail .article-header h1::after {
    content: '';
    flex: 1;
    height: 2px;
    background: linear-gradient(to right, transparent, var(--brand-primary) 20%, var(--brand-gold) 80%, transparent);
}

.article-detail .article-header h1::before {
    background: linear-gradient(to right, transparent, var(--brand-gold) 20%, var(--brand-primary) 80%);
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    font-size: var(--font-size-sm);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--border-color-split);
}

.article-meta span {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    background: var(--neutral-2);
    border-radius: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.article-meta span:first-child {
    background: linear-gradient(135deg, #e6f7ff 0%, #bae7ff 100%);
    color: var(--brand-primary);
}

.article-meta span:nth-child(2) {
    background: linear-gradient(135deg, #fff7e6 0%, #ffd591 100%);
    color: var(--brand-warning);
}

.article-content {
    font-size: var(--font-size-md);
    line-height: 1.8;
    color: var(--text-primary);
}

.article-content h2 {
    font-size: 26px;
    font-weight: 600;
    line-height: var(--line-height-heading);
    margin-top: var(--space-xxxl);
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.article-content h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    line-height: var(--line-height-heading);
    margin-top: var(--space-xl);
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.article-content p {
    margin-bottom: var(--space-md);
}

.article-content img {
    margin: var(--space-xl) 0;
    border-radius: var(--radius-base);
    max-width: 100%;
    height: auto;
}

.article-content figure {
    margin: var(--space-xl) 0;
    text-align: center;
}

.article-content figure img {
    margin: 0;
    border-radius: var(--radius-base);
    max-width: 100%;
    height: auto;
    text-align: center;
    margin: 0 auto;
}

.article-content figcaption {
    margin-top: var(--space-sm);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-style: italic;
    text-align: center;
    line-height: 1.6;
    padding: 0 var(--space-md);
}

.article-content ul,
.article-content ol {
    margin: var(--space-lg) 0;
    padding-left: var(--space-xxl);
    line-height: 1.8;
}

.article-content ul {
    list-style-type: disc;
}

.article-content ol {
    list-style-type: decimal;
}

.article-content li {
    margin-bottom: var(--space-sm);
    padding-left: var(--space-xs);
    color: var(--text-primary);
}

.article-content ul ul,
.article-content ol ul {
    list-style-type: circle;
    margin-top: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.article-content ul ul ul,
.article-content ol ul ul {
    list-style-type: square;
}

.article-content ol ol {
    list-style-type: lower-alpha;
    margin-top: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.article-content ol ol ol {
    list-style-type: lower-roman;
}

.article-content a {
    color: var(--brand-primary);
}

.article-content a:hover {
    color: var(--brand-primary-hover);
    text-decoration: underline;
}

.article-content blockquote {
    margin: var(--space-lg) 0;
    padding: var(--space-md) var(--space-lg);
    border-left: 4px solid var(--brand-primary);
    background: var(--neutral-2);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
}

.article-content code {
    padding: 2px 8px;
    background: var(--neutral-3);
    border-radius: var(--radius-sm);
    font-family: 'Monaco', 'Menlo', 'Courier New', monospace;
    font-size: 0.9em;
    color: var(--brand-danger);
}

.article-content pre {
    margin: var(--space-lg) 0;
    padding: var(--space-md);
    background: #282c34;
    border-radius: var(--radius-base);
    overflow-x: auto;
}

.article-content pre code {
    padding: 0;
    background: none;
    color: #abb2bf;
    font-size: var(--font-size-sm);
}

/* Tables */
.article-content table {
    width: 100%;
    margin: var(--space-xl) 0;
    border-collapse: collapse;
    border-spacing: 0;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-base);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.article-content thead {
    background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-primary-hover) 100%);
}

.article-content thead th {
    color: white;
    font-weight: 600;
    text-align: left;
    padding: var(--space-md) var(--space-lg);
    font-size: var(--font-size-base);
}

.article-content tbody tr {
    transition: var(--transition-fast);
    border-bottom: 1px solid var(--border-color);
}

.article-content tbody tr:nth-child(even) {
    background: var(--neutral-2);
}

.article-content tbody tr:hover {
    background: #fff7e6;
}

.article-content tbody td {
    padding: var(--space-md) var(--space-lg);
    color: var(--text-primary);
    font-size: var(--font-size-base);
}

.article-content th,
.article-content td {
    border-right: 1px solid var(--border-color);
}

.article-content th:last-child,
.article-content td:last-child {
    border-right: none;
}

/* Horizontal Rule */
.article-content hr {
    margin: var(--space-xxxl) 0;
    border: none;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--border-color) 20%, var(--border-color) 80%, transparent);
}

/* Strong and Em */
.article-content strong {
    font-weight: 700;
    color: var(--text-primary);
}

.article-content em {
    font-style: italic;
    color: var(--text-secondary);
}

/* Mark/Highlight */
.article-content mark {
    background: #fff3cd;
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    color: var(--text-primary);
}

/* Article Tags */
.article-tags {
    margin-top: var(--space-xxxl);
    padding-top: var(--space-xl);
    border-top: 1px solid var(--border-color-split);
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.article-tags .tags-label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-secondary);
    margin-right: var(--space-xs);
}

.article-tags .tag-link {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    background: var(--neutral-2);
    color: var(--text-secondary);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    text-decoration: none;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.article-tags .tag-link:hover {
    background: var(--brand-primary-light);
    color: var(--brand-primary);
    border-color: var(--brand-primary);
    transform: translateY(-1px);
}

/* Social Share */
.social-share {
    margin-top: var(--space-xxxl);
    padding-top: var(--space-xl);
    border-top: 1px solid var(--border-color-split);
}

.social-share h4 {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.share-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.share-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    border-radius: 24px;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: white;
    transition: var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.share-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-base);
    color: white;
}

.share-facebook {
    background: linear-gradient(135deg, #1877f2 0%, #4267B2 100%);
}

.share-twitter {
    background: linear-gradient(135deg, #1DA1F2 0%, #0d8bd9 100%);
}

.share-linkedin {
    background: linear-gradient(135deg, #0077b5 0%, #005885 100%);
}

.share-copy {
    background: linear-gradient(135deg, var(--neutral-7) 0%, var(--neutral-8) 100%);
}

.share-btn svg {
    flex-shrink: 0;
}

/* Load More Button */
.load-more-container {
    display: flex;
    justify-content: center;
    margin: var(--space-xxxl) 0;
}

.btn-load-more {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: 12px 32px;
    background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-primary-hover) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-full);
    font-size: var(--font-size-md);
    font-weight: 600;
    font-family: var(--font-family);
    cursor: pointer;
    transition: var(--transition-fast);
    box-shadow: var(--shadow-sm);
    min-width: 180px;
}

.btn-load-more:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-base);
    background: linear-gradient(135deg, var(--brand-primary-hover) 0%, var(--brand-primary) 100%);
}

.btn-load-more:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.btn-load-more:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: translateY(0);
}

/* Pagination */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    margin-top: var(--space-xxxl);
    padding: var(--space-lg) 0;
}

.pagination-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: var(--neutral-1);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-base);
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition-fast);
    cursor: pointer;
}

.pagination-btn:hover:not(.disabled) {
    background: var(--brand-primary);
    color: white;
    border-color: var(--brand-primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.pagination-btn.disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
}

.pagination-btn svg {
    flex-shrink: 0;
}

.pagination-numbers {
    display: flex;
    align-items: center;
    gap: 4px;
    margin: 0 var(--space-xs);
}

.pagination-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 8px;
    background: var(--neutral-1);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition-fast);
    cursor: pointer;
}

.pagination-number:hover:not(.active) {
    background: var(--neutral-2);
    border-color: var(--brand-primary);
    color: var(--brand-primary);
}

.pagination-number.active {
    background: var(--brand-primary);
    color: white;
    border-color: var(--brand-primary);
    cursor: default;
    font-weight: 600;
}

.pagination-ellipsis {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    color: var(--text-tertiary);
    font-size: var(--font-size-base);
    font-weight: 500;
}

/* Post Navigation */
.post-navigation {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    margin-top: var(--space-xxxl);
}

.nav-previous,
.nav-next {
    background: var(--neutral-1);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.nav-previous::before,
.nav-next::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(to bottom, var(--brand-primary), var(--brand-success));
    opacity: 0;
    transition: var(--transition-fast);
}

.nav-previous:hover::before,
.nav-next:hover::before {
    opacity: 1;
}

.nav-previous:hover,
.nav-next:hover {
    border-color: var(--brand-primary);
    box-shadow: var(--shadow-base);
    transform: translateY(-2px);
}

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

.nav-label {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    margin-bottom: var(--space-xs);
    font-weight: 500;
}

.nav-title {
    display: block;
    font-size: var(--font-size-md);
    color: var(--text-primary);
    font-weight: 600;
    line-height: 1.5;
}

.nav-previous a:hover .nav-title,
.nav-next a:hover .nav-title {
    color: var(--brand-primary);
}

/* Related Articles */
.related-articles {
    margin-top: var(--space-xxxl);
    padding-top: var(--space-xxxl);
    border-top: 2px solid var(--border-color-split);
}

.section-title {
    font-size: var(--font-size-xxl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-xl);
    position: relative;
    padding-bottom: var(--space-md);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(to right, var(--brand-primary), var(--brand-success));
    border-radius: 2px;
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.related-card {
    background: var(--neutral-1);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition-base);
}

.related-card:hover {
    border-color: var(--brand-primary);
    box-shadow: var(--shadow-base);
    transform: translateY(-4px);
}

.related-link {
    display: block;
    color: inherit;
}

.related-image {
    width: 100%;
    height: 180px;
    overflow: hidden;
    background: var(--neutral-3);
}

.related-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-base);
}

.related-card:hover .related-image img {
    transform: scale(1.08);
}

.related-content {
    padding: var(--space-lg);
}

.related-content h4 {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.5;
    margin-bottom: var(--space-sm);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.related-card:hover h4 {
    color: var(--brand-primary);
}

.related-meta {
    display: flex;
    gap: var(--space-sm);
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

.related-meta span {
    display: inline-flex;
    align-items: center;
    padding: 3px 8px;
    background: var(--neutral-2);
    border-radius: 10px;
}

/* Comment Section */
.comment-section {
    margin-top: var(--space-xxxl);
    padding-top: var(--space-xxxl);
    border-top: 2px solid var(--border-color-split);
}

.comment-note {
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    line-height: 1.7;
}

.required {
    color: var(--brand-danger);
    font-weight: bold;
}

.comment-form {
    background: var(--neutral-1);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-xxl);
}

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

.form-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.comment-form label {
    display: block;
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.comment-form input[type="text"],
.comment-form input[type="email"],
.comment-form input[type="url"],
.comment-form textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-base);
    font-size: var(--font-size-base);
    font-family: inherit;
    color: var(--text-primary);
    background: var(--neutral-2);
    transition: var(--transition-fast);
}

.comment-form input:focus,
.comment-form textarea:focus {
    outline: none;
    border-color: var(--brand-primary);
    background: var(--neutral-1);
    box-shadow: 0 0 0 3px rgba(24, 144, 255, 0.1);
}

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

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    cursor: pointer;
    font-weight: 400;
}

.checkbox-label input[type="checkbox"] {
    margin-top: 4px;
    cursor: pointer;
    width: 18px;
    height: 18px;
    accent-color: var(--brand-primary);
}

.checkbox-label span {
    color: var(--text-secondary);
    line-height: 1.6;
}

.submit-button {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 14px 32px;
    background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-primary-active) 100%);
    color: white;
    font-size: var(--font-size-md);
    font-weight: 600;
    border: none;
    border-radius: 28px;
    cursor: pointer;
    transition: var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.submit-button:hover {
    background: linear-gradient(135deg, var(--brand-primary-hover) 0%, var(--brand-primary) 100%);
    box-shadow: var(--shadow-base);
    transform: translateY(-2px);
}

.submit-button:active {
    transform: translateY(0);
}

/* --- 8. Footer --- */
.site-footer {
    background: linear-gradient(135deg, #1a1a1a 0%, #242424 100%);
    border-top: 3px solid var(--brand-primary);
    margin-top: var(--space-xxxl);
    padding: var(--space-xxxl) 0 var(--space-xl);
}

.footer-widgets {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-xxxl);
    margin-bottom: var(--space-xxl);
}

.footer-widget .widget-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: var(--space-md);
    padding: 0;
    padding-bottom: var(--space-sm);
    border: none;
    background: none;
    position: relative;
}

.footer-widget .widget-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: linear-gradient(to right, var(--brand-primary), var(--brand-gold));
}

.footer-widget p {
    font-size: var(--font-size-base);
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.65);
    margin-bottom: var(--space-sm);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--space-xs);
}

.footer-links a {
    display: inline-block;
    padding: 4px 0;
    font-size: var(--font-size-base);
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition-fast);
    position: relative;
}

.footer-links a::before {
    content: '→';
    margin-right: 8px;
    opacity: 0;
    transition: var(--transition-fast);
}

.footer-links a:hover {
    color: var(--brand-gold);
    padding-left: 12px;
}

.footer-links a:hover::before {
    opacity: 1;
}

.contact-info {
    margin-bottom: var(--space-lg);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
}

.contact-icon {
    flex-shrink: 0;
    margin-top: 2px;
    color: var(--brand-gold);
    stroke-width: 2;
}

.contact-item strong {
    color: rgba(255, 255, 255, 0.9);
}

.footer-social {
    margin-top: var(--space-lg);
    padding-top: var(--space-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.social-icons {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.social-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.08);
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition-fast);
}

.social-icon:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.social-icon.telegram:hover {
    background: linear-gradient(135deg, #0088cc 0%, #229ED9 100%);
    color: white;
}

.social-icon.facebook:hover {
    background: linear-gradient(135deg, #1877f2 0%, #4267B2 100%);
    color: white;
}

.social-icon.twitter:hover {
    background: linear-gradient(135deg, #1DA1F2 0%, #0d8bd9 100%);
    color: white;
}

.social-icon.youtube:hover {
    background: linear-gradient(135deg, #FF0000 0%, #cc0000 100%);
    color: white;
}

.social-icon.instagram:hover {
    background: linear-gradient(135deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%);
    color: white;
}

.footer-tags {
    font-size: var(--font-size-base);
    color: rgba(255, 255, 255, 0.65);
    line-height: 1.7;
}

.site-info {
    padding-top: var(--space-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    font-size: var(--font-size-base);
    color: rgba(255, 255, 255, 0.5);
}

.site-info p {
    margin-bottom: var(--space-xs);
}

.site-info a {
    color: rgba(255, 255, 255, 0.6);
}

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

/* --- 9. Responsive --- */
@media (max-width: 992px) {
    .header-search {
        display: none;
    }

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

    .article-card-horizontal {
        flex-direction: column;
    }

    .card-image {
        width: 100%;
    }



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

    .main-grid {
        gap: var(--space-lg);
    }

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

    /* Home page grid - 2 columns on tablet */
    .home-article-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .main-navigation {
        display: none;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .page-header h1 {
        font-size: var(--font-size-xxl);
        gap: 1rem;
    }

    .article-detail {
        padding: var(--space-xl);
    }

    .article-detail .article-header h1 {
        font-size: 28px;
    }

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

    .article-content h2 {
        font-size: var(--font-size-xl);
    }

    .article-content h3 {
        font-size: var(--font-size-lg);
    }

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

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

    .main-grid,
    .main-grid-reverse {
        grid-template-columns: 1fr;
    }

    .sidebar-widget-area {
        order: 1;
    }

    .card-content h3 {
        font-size: var(--font-size-lg);
    }

    .article-card-horizontal:hover {
        transform: translateY(0);
    }

    .post-navigation {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

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

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

    .form-row {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .share-buttons {
        justify-content: center;
    }

    .article-tags {
        gap: var(--space-xs);
    }

    .article-tags .tag-link {
        padding: 5px 12px;
        font-size: 12px;
    }

    /* Home page grid - 1 column on mobile */
    .home-article-grid {
        grid-template-columns: 1fr;
    }

    .home-article-card:hover {
        transform: translateY(0);
    }

    .home-card-image {
        height: 220px;
    }


    .home-articles-title {
        font-size: var(--font-size-xxl);
        gap: 1rem;
    }

    /* Pagination responsive */
    .pagination {
        gap: 4px;
        padding: var(--space-md) 0;
    }

    .pagination-btn {
        padding: 6px 12px;
        font-size: var(--font-size-sm);
    }

    .pagination-ellipsis {
        min-width: 24px;
        height: 32px;
    }
}

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

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


    .home-articles-title {
        font-size: var(--font-size-xl);
        gap: 0.75rem;
    }

    .toc-title {
        font-size: var(--font-size-sm);
    }

    .toc-content {
        max-height: 300px;
        padding: var(--space-sm) var(--space-md);
    }

    .toc-list a {
        font-size: 12px;
        padding: 6px 0;
    }

    .toc-list li.toc-h3 a {
        padding-left: var(--space-md);
    }

    .page-header h1 {
        font-size: var(--font-size-xl);
        gap: 0.75rem;
    }

    .article-detail .article-header h1 {
        gap: 0.75rem;
    }

    .article-detail {
        padding: var(--space-lg);
    }

    .article-detail .article-header h1 {
        font-size: var(--font-size-xxl);
    }

    .comment-form {
        padding: var(--space-lg);
    }

    .share-btn {
        width: 100%;
        justify-content: center;
    }

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

    /* Pagination extra small screens */
    .pagination {
        gap: 2px;
        flex-wrap: wrap;
    }

    .pagination-btn {
        padding: 6px 8px;
        font-size: 12px;
    }

    .pagination-numbers {
        margin: 0 2px;
        gap: 2px;
    }

    .pagination-ellipsis {
        min-width: 20px;
        height: 28px;
    }
}

/* --- 10. Recent Posts Widget --- */
.widget-recent-posts::before {
    background: linear-gradient(to bottom, #fa8c16, #faad14);
}

.recent-posts-list {
    list-style: none;
    padding: var(--space-md) var(--space-md) var(--space-lg);
}

.recent-post-item {
    margin-bottom: var(--space-md);
    position: relative;
}

.recent-post-link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
    position: relative;
}

.recent-post-link:hover {
    background: rgba(24, 144, 255, 0.04);
}

.recent-post-thumbnail {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    overflow: hidden;
    flex-shrink: 0;
    background: linear-gradient(135deg, var(--neutral-3) 0%, var(--neutral-4) 100%);
    position: relative;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: var(--transition-base);
}

.recent-post-thumbnail::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(24, 144, 255, 0.1) 0%, rgba(114, 46, 209, 0.1) 100%);
    opacity: 0;
    transition: var(--transition-fast);
}

.recent-post-link:hover .recent-post-thumbnail::before {
    opacity: 1;
}

.recent-post-link:hover .recent-post-thumbnail {
    box-shadow: 0 4px 12px rgba(24, 144, 255, 0.25);
    transform: scale(1.05);
}

.recent-post-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    position: relative;
    z-index: 1;
}

.recent-post-title {
    flex: 1;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    transition: var(--transition-fast);
    font-weight: 500;
}

.recent-post-link:hover .recent-post-title {
    color: var(--brand-primary);
}

/* --- 11. Category Tree Widget --- */
.widget-categories::before {
    background: linear-gradient(to bottom, #52c41a, #73d13d);
}

.widget-categories .category-tree {
    padding: var(--space-md) var(--space-md) var(--space-lg);
    margin: 0;
}

.category-tree .category-item {
    list-style: none;
    margin: 0;
}

.category-item-wrapper {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    position: relative;
}

.category-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    cursor: pointer;
    color: var(--text-tertiary);
    transition: var(--transition-fast);
    flex-shrink: 0;
    border-radius: var(--radius-sm);
    background: transparent;
}

.category-toggle:hover {
    color: var(--brand-primary);
    background: rgba(24, 144, 255, 0.08);
}

.category-toggle svg {
    transition: var(--transition-base);
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.category-item.expanded .category-toggle svg {
    transform: rotate(90deg);
}

.category-link {
    flex: 1;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 10px var(--space-md);
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
    position: relative;
    font-weight: 500;
}

.category-item-wrapper:has(.category-toggle) .category-link {
    padding-left: 0;
}

.category-link:hover {
    background: rgba(24, 144, 255, 0.06);
    color: var(--brand-primary);
}

/* Children categories */
.category-children {
    list-style: none;
    margin: 0;
    padding: 0;
    padding-left: 32px;
    position: relative;
    display: none;
    animation: slideDown 0.2s ease;
}

.category-item.expanded > .category-children {
    display: block;
}

/* Tree lines - 更精致的树状连接线 */
.category-children::before {
    content: '';
    position: absolute;
    left: 12px;
    top: 0;
    bottom: 14px;
    width: 1px;
    background: linear-gradient(to bottom, var(--border-color) 0%, var(--border-color) 80%, transparent 100%);
}

.category-child {
    position: relative;
    margin: 0;
}

.category-child::before {
    content: '';
    position: absolute;
    left: -20px;
    top: 50%;
    width: 16px;
    height: 1px;
    background: var(--border-color);
}

.category-child::after {
    content: '';
    position: absolute;
    left: -20px;
    top: 50%;
    width: 4px;
    height: 4px;
    background: var(--brand-primary);
    border-radius: 50%;
    transform: translate(-1px, -50%);
    opacity: 0;
    transition: var(--transition-fast);
}

.category-child:hover::after {
    opacity: 1;
}

.category-child:last-child::before {
    background: linear-gradient(to right, var(--border-color) 0%, var(--border-color) 70%, transparent 100%);
}

.category-child .category-link {
    padding-left: var(--space-md);
    font-size: var(--font-size-sm);
    font-weight: 400;
}

/* Active state - 更明显的激活状态 */
.category-item.active > .category-item-wrapper .category-link {
    background: linear-gradient(90deg, rgba(24, 144, 255, 0.12) 0%, rgba(24, 144, 255, 0.04) 100%);
    color: var(--brand-primary);
    font-weight: 600;
    border-left: 3px solid var(--brand-primary);
    padding-left: calc(var(--space-md) + 1px);
}

.category-child.active .category-link {
    background: linear-gradient(90deg, rgba(24, 144, 255, 0.1) 0%, rgba(24, 144, 255, 0.02) 100%);
    color: var(--brand-primary);
    font-weight: 600;
    border-left: 2px solid var(--brand-primary);
    padding-left: calc(var(--space-md) + 2px);
}

/* Category count badge (可选) */
.category-count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 20px;
    height: 20px;
    padding: 0 6px;
    background: var(--neutral-3);
    color: var(--text-tertiary);
    font-size: 11px;
    font-weight: 600;
    border-radius: 10px;
    margin-left: auto;
    transition: var(--transition-fast);
}

.category-link:hover .category-count {
    background: var(--brand-primary);
    color: white;
}

.category-item.active .category-count {
    background: var(--brand-primary);
    color: white;
}

/* --- 12. Utilities --- */
.text-center {
    text-align: center;
}

.empty-state {
    padding: var(--space-xxxl) var(--space-lg);
    text-align: center;
    color: var(--text-secondary);
    background: var(--neutral-1);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.empty-state p {
    font-size: var(--font-size-md);
    margin: 0;
}