/* MODERN DAILY NEWS & TECH MAGAZINE THEME */

/* ==========================================================================
   Design System & Variable Declarations
   ========================================================================== */
:root {
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --max-width: 1200px;
    --content-max-width: 720px;
    --border-radius-lg: 16px;
    --border-radius-md: 12px;
    --border-radius-sm: 8px;
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Mode Variables */
:root.light-mode {
    --bg-color: #f2f7f9;       /* Premium soft ice-blue background from Penci */
    --bg-secondary: #e5edf0;   /* Slightly darker pastel blue */
    --text-color: #0f172a;
    --text-secondary: #475569;
    --primary-color: #12afe4;  /* Premium Cyan Blue from Penci */
    --accent-color: #ff6b35;   /* Vibrant Orange */
    --accent-hover: #e04e29;
    --card-bg: #ffffff;        /* Pure white cards pop out beautifully! */
    --border-color: #dbeafe;   /* Extremely elegant border color matching light blue */
    --card-shadow: 0 4px 20px -2px rgba(18, 175, 228, 0.05), 0 2px 6px -1px rgba(18, 175, 228, 0.03);
    --header-bg: rgba(242, 247, 249, 0.85); /* Header glass background matching */
    --meta-color: #64748b;
    --nav-hover: var(--primary-color);
    --badge-bg: rgba(255, 107, 53, 0.08);
}

/* Dark Mode Variables */
:root.dark-mode {
    --bg-color: #0a0d14;       /* Deep dark navy-blue background from Penci dark design */
    --bg-secondary: #111522;   /* Slightly lighter dark navy */
    --text-color: #f1f5f9;
    --text-secondary: #94a3b8;
    --primary-color: #12afe4;  /* Bright Cyan Blue */
    --accent-color: #ff6b35;   /* Vibrant Orange */
    --accent-hover: #ff8557;
    --card-bg: #141926;        /* Dark navy-blue cards stand out! */
    --border-color: #1e2638;   /* Dark border */
    --card-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.6), 0 4px 12px -5px rgba(0, 0, 0, 0.4);
    --header-bg: rgba(10, 13, 20, 0.85);
    --meta-color: #64748b;
    --nav-hover: var(--primary-color);
    --badge-bg: rgba(255, 107, 53, 0.15);
}

/* ==========================================================================
   Base resets & typography
   ========================================================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-family);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

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

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

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ==========================================================================
   Header & Sticky Navigation (Synchronized Brand Header)
   ========================================================================== */
.site-header {
    position: sticky;
    top: 10px;
    margin-bottom: 24px;
    z-index: 1000;
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.site-header-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 16px;
}

.site-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.82);
    border: 1px solid rgba(255, 255, 255, 0.4);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.03);
    /* Lighter blur + more opaque bg: keeps the glass look but stops the browser
       re-sampling a heavy 20px blur on every scroll frame (main scroll-jank fix). */
    backdrop-filter: blur(10px) saturate(140%);
    -webkit-backdrop-filter: blur(10px) saturate(140%);
    padding: 0 20px;
    transition: background var(--transition-normal), border var(--transition-normal);
}

:root.dark-mode .site-nav {
    background: rgba(21, 25, 33, 0.85);
    border: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

/* Logos switching dynamically */
.logo-light, .logo-dark {
    height: 32px;
    width: auto;
    display: block;
    object-fit: contain;
    transition: transform var(--transition-fast);
}

.site-nav-logo:hover img {
    transform: scale(1.02);
}

:root.light-mode .logo-light { display: block; }
:root.light-mode .logo-dark { display: none; }
:root.dark-mode .logo-light { display: none; }
:root.dark-mode .logo-dark { display: block; }

/* Navigation links */
.site-nav-center {
    display: flex;
    align-items: center;
}

.nav {
    display: flex;
    list-style: none;
    gap: 12px;
    align-items: center;
}

.nav li {
    position: relative;
}

.nav li a {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: 20px;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.nav li a:hover,
.nav li.nav-current a {
    color: var(--text-color);
    background: rgba(0, 0, 0, 0.04);
}

:root.dark-mode .nav li a:hover,
:root.dark-mode .nav li.nav-current a {
    background: rgba(255, 255, 255, 0.06);
}

/* Tool Dropdown Menu */
.nav-dropdown-item:hover .nav-dropdown-menu {
    display: block;
}

.nav-dropdown-toggle {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.chevron-icon {
    width: 12px;
    height: 12px;
    transition: transform var(--transition-fast);
}

.nav-dropdown-item:hover .chevron-icon {
    transform: rotate(180deg);
}

.nav-dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: var(--card-shadow);
    list-style: none;
    padding: 8px;
    width: 220px;
    z-index: 1010;
    margin-top: 8px;
    animation: dropdownFade 0.2s ease;
}

@keyframes dropdownFade {
    from { opacity: 0; transform: translate(-50%, 6px); }
    to { opacity: 1; transform: translate(-50%, 0); }
}

.nav-dropdown-menu li a {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    padding: 8px 12px;
    border-radius: 10px;
    text-align: left;
}

.nav-dropdown-menu li a:hover {
    background: rgba(0, 0, 0, 0.04);
    color: var(--text-color);
}

:root.dark-mode .nav-dropdown-menu li a:hover {
    background: rgba(255, 255, 255, 0.05);
}

.site-nav-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Settings, Theme Switcher Buttons */
.theme-toggle-btn {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    cursor: pointer;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-fast), border var(--transition-fast);
}

.theme-toggle-btn:hover {
    background-color: var(--bg-secondary);
}

.theme-toggle-btn svg {
    width: 18px;
    height: 18px;
}

/* Switch visible icon based on active mode */
:root.light-mode .theme-toggle-btn .sun-icon { display: none; }
:root.light-mode .theme-toggle-btn .moon-icon { display: block; color: var(--text-color); }
:root.dark-mode .theme-toggle-btn .sun-icon { display: block; color: var(--accent-color); }
:root.dark-mode .theme-toggle-btn .moon-icon { display: none; }

/* Vào Dashboard CTA Button matching main site style */
.btn-dashboard {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    height: 38px;
    padding: 0 18px;
    font-size: 13px;
    font-weight: 700;
    color: #ffffff;
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-hover) 100%);
    border-radius: 20px;
    box-shadow: 0 4px 14px rgba(255, 107, 53, 0.3);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-dashboard:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 18px rgba(255, 107, 53, 0.4);
    color: #ffffff;
}

.btn-dashboard svg {
    width: 14px;
    height: 14px;
}

.arrow-up-right {
    transition: transform var(--transition-fast);
}

.btn-dashboard:hover .arrow-up-right {
    transform: translate(1px, -1px);
}

/* ==========================================================================
   Home Hero Section (1 Featured Card + 1 Sidebar list)
   ========================================================================== */
.site-home-content {
    padding-top: 40px;
    padding-bottom: 60px;
}

.news-hero {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 32px;
    margin-bottom: 50px;
}

/* Left Featured Card */
.hero-featured-card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.hero-featured-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px -10px rgba(0, 0, 0, 0.15);
}

.hero-featured-image-link {
    display: block;
    overflow: hidden;
    aspect-ratio: 16/9;
}

.hero-featured-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.hero-featured-card:hover .hero-featured-image {
    transform: scale(1.03);
}

.hero-featured-content {
    padding: 32px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.hero-meta, .grid-post-meta, .article-meta-info {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13px;
    font-weight: 500;
    color: var(--meta-color);
    margin-bottom: 16px;
}

.category-badge {
    color: var(--accent-color);
    background-color: var(--badge-bg);
    padding: 4px 12px;
    border-radius: 50px;
    font-weight: 700;
    text-transform: uppercase;
    font-size: 11px;
    letter-spacing: 0.5px;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.category-badge:hover {
    background-color: var(--accent-color);
    color: #ffffff;
}

.hero-title {
    font-size: 32px;
    font-weight: 800;
    line-height: 1.25;
    letter-spacing: -0.75px;
    margin-bottom: 12px;
    transition: color var(--transition-fast);
}

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

.hero-excerpt {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.5;
}

.read-more-btn {
    margin-top: auto;
    font-size: 14px;
    font-weight: 700;
    color: var(--accent-color);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: gap var(--transition-fast);
}

.read-more-btn:hover {
    color: var(--accent-hover);
    gap: 10px;
}

.arrow-icon {
    width: 16px;
    height: 16px;
}

/* Right Sidebar */
.hero-sidebar {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 24px;
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 16px;
    margin-bottom: 20px;
}

.sidebar-title {
    font-size: 18px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
}

.pulse-icon {
    width: 8px;
    height: 8px;
    background-color: var(--accent-color);
    border-radius: 50%;
    display: inline-block;
    position: relative;
}

.pulse-icon::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background-color: var(--accent-color);
    border-radius: 50%;
    animation: pulse 1.8s infinite ease-in-out;
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 0.8; }
    100% { transform: scale(3.5); opacity: 0; }
}

.sidebar-posts {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.sidebar-post-item {
    padding-bottom: 18px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-post-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.sidebar-post-meta {
    font-size: 11px;
    color: var(--meta-color);
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.sidebar-post-tag {
    font-weight: 700;
    color: var(--accent-color);
    text-transform: uppercase;
}

.sidebar-post-title {
    font-size: 15px;
    font-weight: 600;
    line-height: 1.4;
}

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

/* ==========================================================================
   Section Divider
   ========================================================================== */
.section-title-wrap {
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 12px;
    margin-bottom: 32px;
    display: flex;
    align-items: center;
}

.section-title {
    font-size: 22px;
    font-weight: 800;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -14px;
    left: 0;
    width: 60px;
    height: 3px;
    background-color: var(--accent-color);
}

.section-view-all {
    margin-left: auto;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-color);
    text-decoration: none;
    white-space: nowrap;
}

.section-view-all:hover {
    opacity: 0.8;
}

.section-view-all .meta-icon {
    width: 15px;
    height: 15px;
}

/* ==========================================================================
   3-Column Main Grid
   ========================================================================== */
.post-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-bottom: 50px;
}

.grid-post-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--card-shadow);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.grid-post-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 20px -8px rgba(0, 0, 0, 0.12);
}

.grid-post-image-link {
    display: block;
    overflow: hidden;
    aspect-ratio: 16/10;
}

.grid-post-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.grid-post-card:hover .grid-post-image {
    transform: scale(1.03);
}

.grid-post-content {
    padding: 24px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.grid-post-tag {
    font-weight: 700;
    color: var(--accent-color);
    text-transform: uppercase;
    font-size: 11px;
}

.grid-post-title {
    font-size: 18px;
    font-weight: 700;
    line-height: 1.35;
    margin-bottom: 10px;
}

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

.grid-post-excerpt {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* No posts styling */
.no-posts-container {
    padding: 80px 0;
    text-align: center;
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius-lg);
}

.no-posts {
    color: var(--text-secondary);
    font-size: 16px;
}

/* ==========================================================================
   Article Detail Page
   ========================================================================== */
.article-detail {
    padding-top: 50px;
    padding-bottom: 80px;
}

.article-header {
    max-width: 800px;
    margin: 0 auto 40px auto;
    text-align: center;
}

.article-meta-info {
    justify-content: center;
    margin-bottom: 20px;
}

.meta-divider {
    color: var(--border-color);
}

.article-title {
    font-size: clamp(32px, 4.5vw, 48px);
    font-weight: 900;
    line-height: 1.15;
    letter-spacing: -1.25px;
    margin-bottom: 20px;
}

.article-excerpt-detail {
    font-size: 19px;
    color: var(--text-secondary);
    line-height: 1.45;
    max-width: 700px;
    margin: 0 auto 32px auto;
}

.article-hero-image {
    margin-top: 36px;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--card-shadow);
    aspect-ratio: 21/9; /* Tỉ lệ banner tạp chí siêu rộng sang trọng */
    background-color: var(--bg-secondary);
    transition: box-shadow var(--transition-normal);
}

.article-hero-image:hover {
    box-shadow: 0 12px 30px -5px rgba(0, 0, 0, 0.15);
}

.article-hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover; /* Crop ảnh tự động từ trung tâm */
    object-position: center;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.article-hero-image:hover img {
    transform: scale(1.02); /* Hiệu ứng zoom nhẹ sang chảnh */
}

.article-body-container {
    display: block;
}

.article-content {
    max-width: var(--content-max-width);
    margin: 0 auto;
    font-size: 18px; /* Standard high-legibility size */
    line-height: 1.75;
    color: var(--text-color);
}

.article-content p {
    margin-bottom: 28px;
}

.article-content h2 {
    font-size: 26px;
    font-weight: 800;
    margin-top: 48px;
    margin-bottom: 20px;
    letter-spacing: -0.5px;
}

.article-content h3 {
    font-size: 22px;
    font-weight: 700;
    margin-top: 36px;
    margin-bottom: 16px;
}

.article-content blockquote {
    font-size: 20px;
    font-style: italic;
    border-left: 4px solid var(--accent-color);
    padding: 10px 24px;
    margin: 40px 0;
    color: var(--text-secondary);
    background-color: var(--bg-secondary);
    border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
}

.article-content img {
    border-radius: var(--border-radius-md);
    margin: 36px 0;
}

/* ==========================================================================
   Bảng trong bài viết (Article Tables)
   Theme trước đây không có CSS cho bảng nên bảng hiển thị trơ trụi như chữ
   thường. Bọc cuộn ngang trên mobile + style viền/nền/sọc xen kẽ.
   ========================================================================== */
.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 36px 0;
    font-size: 16px;
    line-height: 1.5;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    display: table;
}

.article-content thead {
    background: var(--bg-secondary);
}

.article-content th {
    text-align: left;
    font-weight: 700;
    color: var(--text-color);
    padding: 14px 18px;
    border-bottom: 2px solid var(--border-color);
    white-space: nowrap;
}

.article-content td {
    padding: 13px 18px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
    vertical-align: top;
}

.article-content tbody tr:last-child td {
    border-bottom: none;
}

/* Sọc xen kẽ giúp dễ đọc các dòng */
.article-content tbody tr:nth-child(even) {
    background: var(--bg-secondary);
}

.article-content tbody tr:hover {
    background: var(--badge-bg);
}

/* Cho phép cuộn ngang khi bảng rộng hơn màn hình (mobile) */
@media (max-width: 600px) {
    .article-content table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        white-space: nowrap;
    }
}


/* ==========================================================================
   Pagination & Footer
   ========================================================================== */
.pagination {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
    font-size: 14px;
    font-weight: 700;
    color: var(--text-secondary);
}

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

/* Branded Footer Styles */
.site-footer {
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    padding: 64px 0 32px 0;
    margin-top: 80px;
    font-size: 13px;
    color: var(--text-secondary);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
    position: relative;
    z-index: 10;
}

.site-footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-col {
    display: flex;
    flex-direction: column;
}

.footer-logo {
    display: inline-block;
    margin-bottom: 16px;
}

.footer-logo img {
    height: 32px;
    width: auto;
    object-fit: contain;
}

.footer-desc {
    font-size: 12px;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: 24px;
    max-width: 280px;
}

.footer-social {
    display: flex;
    gap: 8px;
}

.social-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--bg-color);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.social-btn:hover {
    background-color: var(--accent-color);
    color: #ffffff;
    border-color: var(--accent-color);
}

.social-btn svg {
    width: 14px;
    height: 14px;
}

.footer-title {
    font-size: 11px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-color);
    margin-bottom: 20px;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links li a {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

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

/* Made in Vietnam Badge */
.vietnam-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: rgba(239, 68, 68, 0.08);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: #ef4444;
    padding: 6px 12px;
    border-radius: 12px;
    font-weight: 800;
    font-size: 11px;
    margin-bottom: 16px;
    width: fit-content;
}

:root.dark-mode .vietnam-badge {
    background-color: rgba(239, 68, 68, 0.15);
    color: #f87171;
}

.footer-heart {
    font-size: 11px;
    line-height: 1.5;
    color: var(--meta-color);
    display: flex;
    align-items: center;
    gap: 4px;
}

.heart-icon {
    width: 12px;
    height: 12px;
    color: #ef4444;
}

/* Footer Bottom Bar */
.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    padding-top: 24px;
    font-size: 11px;
    color: var(--meta-color);
    font-weight: 500;
}

.footer-version {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    padding: 4px 12px;
    border-radius: 50px;
    color: var(--text-secondary);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1024px) {
    .news-hero {
        grid-template-columns: 1fr;
    }
    
    .post-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .site-nav {
        flex-direction: column;
        height: auto;
        padding: 16px 0;
        gap: 12px;
    }

    .site-nav-center {
        width: 100%;
        overflow-x: auto;
        padding-bottom: 4px;
    }

    .nav {
        gap: 16px;
        justify-content: center;
        white-space: nowrap;
    }
    
    .hero-featured-content {
        padding: 24px;
    }
    
    .hero-title {
        font-size: 26px;
    }

    .post-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .site-footer-content {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }

    .footer-meta-links {
        flex-direction: column;
        gap: 12px;
    }
}

/* ==========================================================================
   Section 2: Horizontal post card list layout
   ========================================================================== */
.post-list-horizontal {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    margin-bottom: 50px;
}

.horizontal-post-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--card-shadow);
    overflow: hidden;
    display: flex;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.horizontal-post-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 20px -8px rgba(0, 0, 0, 0.12);
}

.horizontal-post-image-link {
    width: 40%;
    overflow: hidden;
    display: block;
}

.horizontal-post-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.horizontal-post-card:hover .horizontal-post-image {
    transform: scale(1.03);
}

.horizontal-post-content {
    padding: 20px;
    width: 60%;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.horizontal-post-tag {
    font-weight: 700;
    color: var(--accent-color);
    text-transform: uppercase;
    font-size: 11px;
}

.horizontal-post-meta {
    font-size: 12px;
    color: var(--meta-color);
    margin-bottom: 8px;
    display: flex;
    gap: 10px;
}

.horizontal-post-title {
    font-size: 17px;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 8px;
}

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

.horizontal-post-excerpt {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.4;
    margin-bottom: 12px;
}

/* ==========================================================================
   Section 4 & 5: Dual sections side-by-side row
   ========================================================================== */
.dual-sections-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
    margin-bottom: 50px;
}

.dual-section-column {
    display: flex;
    flex-direction: column;
}

/* Minimalist list posts styling with CSS counters */
.minimal-list-posts {
    counter-reset: list-counter;
    display: flex;
    flex-direction: column;
}

.minimal-post-item {
    display: flex;
    align-items: center;
    padding: 16px 0;
    border-bottom: 1px dashed var(--border-color);
    position: relative;
    transition: transform var(--transition-fast);
}

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

.minimal-post-item:hover {
    transform: translateX(6px);
}

.minimal-post-item::before {
    counter-increment: list-counter;
    content: "0" counter(list-counter);
    font-size: 20px;
    font-weight: 850;
    color: var(--primary-color);
    margin-right: 16px;
    line-height: 1;
    font-feature-settings: "tnum";
    flex-shrink: 0;
}

.minimal-list-posts.accent .minimal-post-item::before {
    color: var(--accent-color);
}

.minimal-post-date {
    font-size: 12px;
    font-weight: 700;
    color: var(--primary-color);
    background: rgba(18, 175, 228, 0.08);
    padding: 3px 8px;
    border-radius: 6px;
    margin-right: 14px;
    white-space: nowrap;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.minimal-list-posts.accent .minimal-post-date {
    color: var(--accent-color);
    background: rgba(255, 107, 53, 0.08);
}

.minimal-post-meta {
    font-size: 11px;
    color: var(--meta-color);
    margin-bottom: 4px;
    text-transform: uppercase;
    font-weight: 600;
}

.minimal-post-title {
    font-size: 15px;
    font-weight: 600;
    line-height: 1.4;
    flex: 1;
}

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

/* Make sure mobile responsive settings apply to dual columns and horizontal list */
@media (max-width: 1024px) {
    .post-list-horizontal {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .dual-sections-row {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .horizontal-post-card {
        flex-direction: column;
    }
    
    .horizontal-post-image-link {
        width: 100%;
        aspect-ratio: 16/9;
    }
    
    .horizontal-post-content {
        width: 100%;
        padding: 20px;
    }
}

/* ==========================================================================
   Nâng cấp UX & UI: Progress Bar, Reading Time, Sidebar, Newsletter, Topic Grid
   ========================================================================== */

/* 1. Reading Progress Bar */
.reading-progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--accent-color) 100%);
    /* Animate with a GPU-composited transform instead of width so updating the
       progress on scroll never triggers layout/paint (smooth scrolling). */
    width: 100%;
    transform: scaleX(0);
    transform-origin: left center;
    will-change: transform;
    z-index: 1010;
    transition: transform 0.1s ease-out;
}

/* 2. Reading Time Styles */
.reading-time {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.meta-icon {
    width: 13px !important;
    height: 13px !important;
    vertical-align: middle;
    display: inline-block;
}

.reading-time-compact {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    font-size: 11px;
}

.meta-icon-mini {
    width: 10px !important;
    height: 10px !important;
    vertical-align: middle;
    display: inline-block;
}

.article-reading-time {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.meta-divider {
    margin: 0 4px;
}

/* 3. 2-Column Layout for Post Page */
.article-layout-grid {
    display: grid;
    grid-template-columns: 2.2fr 0.9fr;
    gap: 48px;
    align-items: start;
    margin-top: 40px;
}

.article-main {
    min-width: 0; /* Hóa giải lỗi flexbox grid text tràn */
}

/* 4. Sidebar Widget Styling */
.article-sidebar {
    position: sticky;
    top: 90px;
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.sidebar-widget {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--card-shadow);
    padding: 24px;
}

.widget-title {
    font-size: 15px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 8px;
    color: var(--text-color);
}

.widget-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 36px;
    height: 2px;
    background-color: var(--accent-color);
}

/* Widget Search */
.search-form {
    display: flex;
    position: relative;
}

.search-input {
    width: 100%;
    height: 40px;
    padding: 0 44px 0 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-family);
    font-size: 13px;
    font-weight: 500;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(18, 175, 228, 0.15);
}

.search-submit {
    position: absolute;
    right: 0;
    top: 0;
    height: 40px;
    width: 44px;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color var(--transition-fast);
}

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

.search-submit svg {
    width: 16px;
    height: 16px;
}

/* Widget Tools Card List */
.sidebar-tools-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.sidebar-tool-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background-color: var(--bg-color);
    transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
}

.sidebar-tool-card:hover {
    transform: translateY(-2px);
    border-color: var(--primary-color);
    background-color: var(--card-bg);
    box-shadow: 0 4px 12px rgba(18, 175, 228, 0.06);
}

.tool-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: transform var(--transition-fast);
}

.sidebar-tool-card:hover .tool-icon {
    transform: scale(1.1) rotate(5deg);
}

.tool-icon svg {
    width: 18px;
    height: 18px;
}

.tool-info {
    flex: 1;
}

.tool-name {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 2px;
}

.tool-desc {
    font-size: 11px;
    color: var(--text-secondary);
    line-height: 1.3;
}

/* Tool styles - Pastel Background matching system */
.tool-blue .tool-icon { background: rgba(18, 175, 228, 0.08); color: var(--primary-color); }
.tool-orange .tool-icon { background: rgba(255, 107, 53, 0.08); color: var(--accent-color); }
.tool-purple .tool-icon { background: rgba(139, 92, 246, 0.08); color: #8b5cf6; }
.tool-green .tool-icon { background: rgba(16, 185, 129, 0.08); color: #10b981; }

.tool-purple:hover { border-color: #8b5cf6; box-shadow: 0 4px 12px rgba(139, 92, 246, 0.06); }
.tool-green:hover { border-color: #10b981; box-shadow: 0 4px 12px rgba(16, 185, 129, 0.06); }

/* Widget Related Posts in Sidebar */
.related-posts-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.related-post-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding-bottom: 14px;
    border-bottom: 1px dashed var(--border-color);
}

.related-post-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.related-post-date {
    font-size: 11px;
    font-weight: 700;
    color: var(--primary-color);
    background: rgba(18, 175, 228, 0.08);
    padding: 2px 6px;
    border-radius: 4px;
    white-space: nowrap;
    line-height: 1;
}

.related-post-title {
    font-size: 13px;
    font-weight: 600;
    line-height: 1.4;
}

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

/* 5. Newsletter Subscribe Box Styling */
.newsletter-subscribe-box {
    margin-top: 50px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 32px;
    display: flex;
    align-items: center;
    gap: 28px;
    position: relative;
    overflow: hidden;
    box-shadow: var(--card-shadow);
}

.newsletter-subscribe-box::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -20%;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(255, 107, 53, 0.08) 0%, rgba(255, 107, 53, 0) 70%);
    pointer-events: none;
}

.newsletter-subscribe-box::after {
    content: '';
    position: absolute;
    bottom: -50%;
    right: -20%;
    width: 250px;
    height: 250px;
    background: radial-gradient(circle, rgba(18, 175, 228, 0.06) 0%, rgba(18, 175, 228, 0) 70%);
    pointer-events: none;
}

.newsletter-icon-wrap {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.15) 0%, rgba(255, 107, 53, 0.03) 100%);
    color: var(--accent-color);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: 0 4px 15px rgba(255, 107, 53, 0.05);
}

.newsletter-icon-wrap svg {
    width: 24px;
    height: 24px;
}

.newsletter-content {
    flex: 1;
}

.newsletter-title {
    font-size: 18px;
    font-weight: 800;
    margin-bottom: 8px;
    color: var(--text-color);
}

.newsletter-desc {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.5;
}

.newsletter-form {
    max-width: 480px;
}

.form-group {
    display: flex;
    gap: 12px;
}

.newsletter-input {
    flex: 1;
    height: 42px;
    padding: 0 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background-color: var(--card-bg);
    color: var(--text-color);
    font-family: var(--font-family);
    font-size: 13px;
    font-weight: 500;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.newsletter-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(18, 175, 228, 0.15);
}

.newsletter-btn {
    height: 42px;
    padding: 0 20px;
    font-size: 13px;
    font-weight: 700;
    color: #ffffff;
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-hover) 100%);
    border-radius: var(--border-radius-sm);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 4px 12px rgba(255, 107, 53, 0.2);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.newsletter-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(255, 107, 53, 0.3);
}

.newsletter-btn svg {
    width: 14px;
    height: 14px;
    transition: transform var(--transition-fast);
}

.newsletter-btn:hover svg {
    transform: translateX(2px);
}

.message-success, .message-error {
    display: none;
    margin-top: 12px;
    font-size: 12px;
    font-weight: 600;
}

.message-success { color: #10b981; }
.message-error { color: #ef4444; }

/* 6. Topic Grid chân trang chủ */
.topic-grid-section {
    margin-top: 50px;
}

.topic-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 20px;
}

.topic-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 20px 16px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    box-shadow: var(--card-shadow);
    transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.topic-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.05);
}

.topic-icon-wrap {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-fast);
}

.topic-card:hover .topic-icon-wrap {
    transform: scale(1.1);
}

.topic-icon-wrap svg {
    width: 22px;
    height: 22px;
}

.topic-name {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-color);
}

/* Colors for Topic Cards matching pastel aesthetic */
.topic-blue .topic-icon-wrap { background-color: rgba(18, 175, 228, 0.08); color: var(--primary-color); }
.topic-orange .topic-icon-wrap { background-color: rgba(255, 107, 53, 0.08); color: var(--accent-color); }
.topic-purple .topic-icon-wrap { background-color: rgba(139, 92, 246, 0.08); color: #8b5cf6; }
.topic-green .topic-icon-wrap { background-color: rgba(16, 185, 129, 0.08); color: #10b981; }
.topic-yellow .topic-icon-wrap { background-color: rgba(245, 158, 11, 0.08); color: #f59e0b; }
.topic-pink .topic-icon-wrap { background-color: rgba(236, 72, 153, 0.08); color: #ec4899; }

.topic-blue:hover { border-color: var(--primary-color); }
.topic-orange:hover { border-color: var(--accent-color); }
.topic-purple:hover { border-color: #8b5cf6; }
.topic-green:hover { border-color: #10b981; }
.topic-yellow:hover { border-color: #f59e0b; }
.topic-pink:hover { border-color: #ec4899; }


/* ==========================================================================
   Responsive for New Upgrades
   ========================================================================== */
@media (max-width: 1024px) {
    .article-layout-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .article-sidebar {
        position: static;
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
    
    .topic-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .article-sidebar {
        grid-template-columns: 1fr;
    }
    
    .newsletter-subscribe-box {
        flex-direction: column;
        text-align: center;
        padding: 24px;
        gap: 16px;
    }
    
    .form-group {
        flex-direction: column;
        width: 100%;
    }
    
    .newsletter-btn {
        width: 100%;
        justify-content: center;
    }
    
    .topic-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
}

/* ==========================================================================
   Cải tiến Section Icon & Bài viết Hashtags
   ========================================================================== */

/* Section Title Lucide Icons */
.section-title-icon {
    width: 22px !important;
    height: 22px !important;
    margin-right: 8px;
    vertical-align: middle;
    display: inline-block;
}

.sidebar-title-icon {
    width: 18px !important;
    height: 18px !important;
    margin-right: 6px;
    vertical-align: middle;
    display: inline-block;
}

/* Biến màu sắc cho các biểu tượng */
.color-blue { color: var(--primary-color); }
.color-orange { color: var(--accent-color); }
.color-purple { color: #8b5cf6; }
.color-green { color: #10b981; }
.color-yellow { color: #f59e0b; }
.color-red { color: #ef4444; }

/* Hashtag area at the end of post */
.article-tags-wrap {
    margin-top: 36px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
}

.tags-label {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-secondary);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.tags-label svg {
    width: 14px;
    height: 14px;
}

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

.post-tag-item {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    background-color: var(--bg-secondary);
    padding: 4px 12px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.post-tag-item:hover {
    color: #ffffff;
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    transform: translateY(-1px);
}

/* Responsive cho Hero Image bài viết chi tiết */
@media (max-width: 768px) {
    .article-hero-image {
        aspect-ratio: 16/9 !important; /* Mobile dùng tỷ lệ 16:9 để cân đối */
        margin-top: 24px;
    }
}

/* ==========================================================================
   Tích hợp UX Nâng cao: Sticky Share, TOC, Related Post Grid
   ========================================================================== */

/* 1. Sticky Social Share Bar (Lơ lửng mép trái) */
.sticky-share-bar {
    position: sticky;
    top: 100px;
    float: left;
    margin-left: -76px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    z-index: 100;
    width: 48px;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 16px 0;
    border-radius: 50px;
    box-shadow: var(--card-shadow);
}

.share-label {
    font-size: 9px;
    font-weight: 800;
    text-transform: uppercase;
    color: var(--text-secondary);
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.share-btn {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    cursor: pointer;
    position: relative;
    transition: all var(--transition-fast);
}

.share-btn svg {
    width: 14px;
    height: 14px;
}

.share-facebook:hover {
    background-color: #1877f2;
    color: #ffffff;
    border-color: #1877f2;
    box-shadow: 0 4px 12px rgba(24, 119, 242, 0.3);
}

.share-zalo {
    text-decoration: none;
}

.zalo-text-icon {
    font-weight: 900;
    font-size: 13px;
    font-family: Arial, sans-serif;
    line-height: 1;
}

.share-zalo:hover {
    background-color: #0068ff;
    color: #ffffff;
    border-color: #0068ff;
    box-shadow: 0 4px 12px rgba(0, 104, 255, 0.3);
}

.share-copy:hover {
    background-color: var(--primary-color);
    color: #ffffff;
    border-color: var(--primary-color);
    box-shadow: 0 4px 12px rgba(18, 175, 228, 0.3);
}

/* Tooltip style */
.tooltip-text {
    visibility: hidden;
    width: 80px;
    background-color: #000000;
    color: #fff;
    text-align: center;
    border-radius: 6px;
    padding: 5px 0;
    position: absolute;
    z-index: 1020;
    left: 125%; /* Hiển thị bên phải của nút */
    top: 50%;
    transform: translateY(-50%);
    opacity: 0;
    transition: opacity 0.3s;
    font-size: 11px;
    font-weight: 700;
}

.tooltip-text::after {
    content: "";
    position: absolute;
    top: 50%;
    right: 100%;
    margin-top: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: transparent #000000 transparent transparent;
}

.share-btn:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
}

/* 2. Interactive Table of Contents (Mục lục Sidebar) */
.widget-toc {
    max-height: 480px;
    overflow-y: auto;
}

.toc-container {
    margin: 0;
    padding: 0;
}

.toc-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.toc-item {
    padding: 0;
    margin: 0;
}

.toc-item-h3 {
    padding-left: 16px; /* Thụt lề phân cấp cho h3 */
}

.toc-link {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    display: block;
    line-height: 1.4;
    border-left: 2px solid var(--border-color);
    padding-left: 12px;
    transition: all var(--transition-fast);
}

.toc-link:hover {
    color: var(--primary-color);
    border-left-color: var(--primary-color);
}

.toc-link.active {
    color: var(--accent-color);
    font-weight: 700;
    border-left-color: var(--accent-color);
    border-left-width: 3px;
    padding-left: 11px;
}

/* 3. Related Post Grid Chân bài */
.article-related-section {
    margin-top: 56px;
    padding-top: 36px;
    border-top: 1px solid var(--border-color);
}

.related-section-title {
    font-size: 18px;
    font-weight: 850;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.related-posts-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.related-grid-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--card-shadow);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.related-grid-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.related-card-image-link {
    display: block;
    aspect-ratio: 16/10;
    overflow: hidden;
}

.related-card-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.related-grid-card:hover .related-card-image {
    transform: scale(1.03);
}

.related-card-content {
    padding: 16px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.related-card-meta {
    font-size: 11px;
    font-weight: 700;
    color: var(--primary-color);
    text-transform: uppercase;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.related-card-tag {
    background-color: rgba(18, 175, 228, 0.08);
    padding: 2px 6px;
    border-radius: 4px;
}

.related-card-title {
    font-size: 14px;
    font-weight: 700;
    line-height: 1.4;
}

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

/* ==========================================================================
   Responsive cho các tính năng mới
   ========================================================================== */
@media (max-width: 1200px) {
    .sticky-share-bar {
        display: none !important; /* Ẩn share bar lơ lửng trên màn hình nhỏ */
    }
}

@media (max-width: 768px) {
    .related-posts-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

/* ==========================================================================
   Tools CTA Banner (Cầu nối trang chủ → bộ công cụ kinhdoanh.net)
   ========================================================================== */
.tools-cta-banner {
    margin-bottom: 50px;
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    background:
        radial-gradient(circle at 12% 18%, rgba(18, 175, 228, 0.10) 0%, rgba(18, 175, 228, 0) 45%),
        radial-gradient(circle at 88% 82%, rgba(255, 107, 53, 0.10) 0%, rgba(255, 107, 53, 0) 45%),
        var(--card-bg);
    box-shadow: var(--card-shadow);
    overflow: hidden;
}

.tools-cta-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 36px;
    padding: 40px;
    align-items: center;
}

.tools-cta-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: var(--primary-color);
    background: rgba(18, 175, 228, 0.08);
    padding: 5px 12px;
    border-radius: 50px;
    margin-bottom: 16px;
}

.tools-cta-eyebrow svg {
    width: 14px;
    height: 14px;
}

.tools-cta-title {
    font-size: 26px;
    font-weight: 800;
    line-height: 1.25;
    letter-spacing: -0.5px;
    margin-bottom: 12px;
    color: var(--text-color);
}

.tools-cta-desc {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 24px;
}

.tools-cta-main-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    height: 46px;
    padding: 0 26px;
    font-size: 15px;
    font-weight: 700;
    color: #ffffff;
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-hover) 100%);
    border-radius: 50px;
    box-shadow: 0 6px 18px rgba(255, 107, 53, 0.28);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.tools-cta-main-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 22px rgba(255, 107, 53, 0.4);
    color: #ffffff;
}

.tools-cta-main-btn svg {
    width: 16px;
    height: 16px;
    transition: transform var(--transition-fast);
}

.tools-cta-main-btn:hover svg {
    transform: translateX(3px);
}

.tools-cta-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
}

.tools-cta-card {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 18px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    background-color: var(--card-bg);
    transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.tools-cta-card:hover {
    transform: translateY(-3px);
    border-color: var(--primary-color);
    box-shadow: 0 8px 20px rgba(18, 175, 228, 0.10);
}

.tools-cta-card-icon {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 8px;
    transition: transform var(--transition-fast);
}

.tools-cta-card:hover .tools-cta-card-icon {
    transform: scale(1.1) rotate(5deg);
}

.tools-cta-card-icon svg {
    width: 20px;
    height: 20px;
}

.tools-cta-card-icon.ct-blue { background: rgba(18, 175, 228, 0.10); color: var(--primary-color); }
.tools-cta-card-icon.ct-orange { background: rgba(255, 107, 53, 0.10); color: var(--accent-color); }
.tools-cta-card-icon.ct-purple { background: rgba(139, 92, 246, 0.10); color: #8b5cf6; }
.tools-cta-card-icon.ct-green { background: rgba(16, 185, 129, 0.10); color: #10b981; }

.tools-cta-card-name {
    font-size: 14px;
    font-weight: 700;
    color: var(--text-color);
}

.tools-cta-card-sub {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.4;
}

@media (max-width: 900px) {
    .tools-cta-inner {
        grid-template-columns: 1fr;
        gap: 28px;
        padding: 32px;
    }
}

@media (max-width: 768px) {
    .tools-cta-title {
        font-size: 22px;
    }
    .tools-cta-grid {
        grid-template-columns: 1fr;
    }
}

/* ==========================================================================
   Series Showcase (Chuyên đề Tâm lý học bán hàng trên trang chủ)
   ========================================================================== */
.series-showcase {
    margin-bottom: 50px;
    padding: 36px;
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    background:
        linear-gradient(135deg, rgba(236, 72, 153, 0.06) 0%, rgba(139, 92, 246, 0.05) 100%),
        var(--card-bg);
    box-shadow: var(--card-shadow);
}

.series-showcase-head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 28px;
}

.series-showcase-intro {
    max-width: 620px;
}

.series-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: #ec4899;
    background: rgba(236, 72, 153, 0.10);
    padding: 5px 12px;
    border-radius: 50px;
    margin-bottom: 14px;
}

.series-badge svg {
    width: 14px;
    height: 14px;
}

.series-showcase-title {
    font-size: 28px;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.5px;
    margin-bottom: 10px;
    color: var(--text-color);
}

.series-showcase-desc {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.series-showcase-all {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 700;
    color: #ec4899;
    white-space: nowrap;
    flex-shrink: 0;
    transition: gap var(--transition-fast);
}

.series-showcase-all:hover {
    gap: 10px;
    color: #db2777;
}

.series-showcase-all svg {
    width: 16px;
    height: 16px;
}

.series-showcase-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.series-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--card-shadow);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-fast);
}

.series-card:hover {
    transform: translateY(-4px);
    border-color: #ec4899;
    box-shadow: 0 10px 24px rgba(236, 72, 153, 0.12);
}

.series-card-image-link {
    display: block;
    overflow: hidden;
    aspect-ratio: 16/10;
}

.series-card-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.series-card:hover .series-card-image {
    transform: scale(1.03);
}

.series-card-content {
    padding: 22px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.series-card-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 12px;
    color: var(--meta-color);
    margin-bottom: 10px;
}

.series-card-title {
    font-size: 18px;
    font-weight: 700;
    line-height: 1.35;
    margin-bottom: 10px;
}

.series-card-title a:hover {
    color: #ec4899;
}

.series-card-excerpt {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

@media (max-width: 900px) {
    .series-showcase-head {
        flex-direction: column;
        align-items: flex-start;
        gap: 14px;
    }
    .series-showcase-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 1024px) {
    .topic-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .series-showcase {
        padding: 24px;
    }
    .series-showcase-title {
        font-size: 23px;
    }
}