/**
 * MobiFone Tech Theme - Core Design System & Styles
 * Pure Vanilla CSS - Ultra Fast & Clean
 */

:root {
    --bg-page: #f8fafc;
    --bg-card: #ffffff;
    --bg-dark: #091024;
    --bg-dark-card: #0f1c3f;
    --primary: #0066cc;
    --primary-hover: #0052a3;
    --primary-light: #e6f0fa;
    --primary-glow: rgba(0, 102, 204, 0.2);
    --accent-cyan: #00d2ff;
    --accent-cyan-glow: rgba(0, 210, 255, 0.3);
    --accent-red: #e60012;
    --text-dark: #0f172a;
    --text-body: #334155;
    --text-muted: #64748b;
    --text-light: #94a3b8;
    --border: #e2e8f0;
    --border-dark: #1e294b;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-xl: 24px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 20px rgba(0, 102, 204, 0.35);
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --container-max: 1240px;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
    color: var(--text-body);
    background-color: var(--bg-page);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

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

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

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

button, input {
    font-family: inherit;
}

.mbf-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
.mbf-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(9, 16, 36, 0.95);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border-dark);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.mbf-header-glow {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent-cyan), var(--primary), transparent);
}

.mbf-header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

/* Logo */
.mbf-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.mbf-logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--accent-cyan));
    color: #ffffff;
    border-radius: var(--radius-md);
    box-shadow: 0 0 15px var(--accent-cyan-glow);
}

.mbf-logo-brand {
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: #ffffff;
}

.mbf-accent {
    color: var(--accent-cyan);
}

.mbf-logo-badge {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 700;
    color: #000;
    background: linear-gradient(90deg, #00e5ff, #00ff88);
    padding: 2px 7px;
    border-radius: 20px;
    margin-left: 6px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

/* Desktop Navigation */
.mbf-nav-desktop {
    display: block;
}

.mbf-nav-list {
    display: flex;
    align-items: center;
    gap: 8px;
    list-style: none;
}

.mbf-nav-item a {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    font-size: 0.95rem;
    font-weight: 600;
    color: #cbd5e1;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.mbf-nav-item a:hover,
.mbf-nav-item.active a {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.08);
}

.mbf-nav-item.active a {
    color: var(--accent-cyan);
    box-shadow: inset 0 -2px 0 var(--accent-cyan);
}

.mbf-pill-hot {
    background: var(--accent-red);
    color: #ffffff;
    font-size: 0.65rem;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.85; transform: scale(1.05); }
}

/* Header Actions */
.mbf-header-actions {
    display: flex;
    align-items: center;
    gap: 14px;
}

.mbf-search-trigger {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-dark);
    color: #94a3b8;
    padding: 8px 14px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.88rem;
    transition: var(--transition);
}

.mbf-search-trigger:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
    border-color: var(--primary);
}

.mbf-kbd {
    background: rgba(255, 255, 255, 0.12);
    color: #e2e8f0;
    padding: 2px 7px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-family: monospace;
}

.mbf-hotline-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--primary), #004d99);
    color: #ffffff;
    font-size: 0.85rem;
    font-weight: 700;
    padding: 8px 14px;
    border-radius: 20px;
    box-shadow: 0 0 12px var(--primary-glow);
    transition: var(--transition);
}

.mbf-hotline-badge:hover {
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 4px 18px var(--primary-glow);
}

.mbf-hotline-pulse {
    width: 8px;
    height: 8px;
    background: #00ff88;
    border-radius: 50%;
    box-shadow: 0 0 8px #00ff88;
}

/* Hamburger */
.mbf-burger {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 28px;
    height: 20px;
    background: transparent;
    border: none;
    cursor: pointer;
}

.mbf-burger span {
    width: 100%;
    height: 2px;
    background: #ffffff;
    border-radius: 2px;
    transition: var(--transition);
}

/* Mobile Drawer */
.mbf-mobile-drawer {
    display: none;
}

.mbf-mobile-drawer.open {
    display: block;
}

.mbf-mobile-drawer-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    z-index: 1100;
}

.mbf-mobile-drawer-content {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 300px;
    max-width: 85%;
    background: var(--bg-dark);
    border-left: 1px solid var(--border-dark);
    z-index: 1200;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.mbf-mobile-drawer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.mbf-drawer-close {
    background: none;
    border: none;
    color: #ffffff;
    font-size: 2rem;
    cursor: pointer;
    line-height: 1;
}

.mbf-mobile-search {
    display: flex;
    border: 1px solid var(--border-dark);
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: rgba(255, 255, 255, 0.05);
}

.mbf-mobile-search-input {
    flex: 1;
    background: none;
    border: none;
    color: #ffffff;
    padding: 10px 14px;
    font-size: 0.9rem;
    outline: none;
}

.mbf-mobile-search-btn {
    background: var(--primary);
    border: none;
    color: #ffffff;
    padding: 0 14px;
    cursor: pointer;
}

.mbf-mobile-nav-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.mbf-mobile-nav-list a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 1rem;
    font-weight: 600;
    color: #e2e8f0;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.03);
}

.mbf-mobile-nav-list a.active {
    background: var(--primary);
    color: #ffffff;
}

.mbf-btn-call {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    background: linear-gradient(135deg, var(--primary), var(--accent-cyan));
    color: #ffffff;
    font-weight: 700;
    padding: 12px;
    border-radius: var(--radius-sm);
    margin-top: auto;
}

/* Search Modal */
.mbf-search-modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 2000;
}

.mbf-search-modal.open {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 100px;
}

.mbf-search-modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(8px);
}

.mbf-search-modal-card {
    position: relative;
    width: 600px;
    max-width: 90%;
    background: #0f1c3f;
    border: 1px solid #2a3c6d;
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    padding: 24px;
    z-index: 2010;
}

.mbf-search-input-wrap {
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid #3b5088;
    border-radius: var(--radius-md);
    padding: 12px 18px;
    color: #ffffff;
}

.mbf-search-field {
    flex: 1;
    background: none;
    border: none;
    color: #ffffff;
    font-size: 1.1rem;
    outline: none;
}

.mbf-search-modal-close {
    background: none;
    border: none;
    color: #94a3b8;
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
}

.mbf-search-hints {
    margin-top: 14px;
    font-size: 0.85rem;
    color: #94a3b8;
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.mbf-search-hints a {
    color: var(--accent-cyan);
    background: rgba(0, 210, 255, 0.1);
    padding: 3px 10px;
    border-radius: 12px;
}

/* Breadcrumbs */
.mbf-breadcrumbs {
    padding: 18px 0;
    font-size: 0.88rem;
    color: var(--text-muted);
}

.mbf-breadcrumbs ol {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    list-style: none;
}

.mbf-breadcrumb-sep {
    color: #cbd5e1;
}

.mbf-breadcrumb-current {
    color: var(--text-dark);
    font-weight: 600;
}

/* ========================================================
   HOME PAGE (TECH VIBE & EYE CATCHING)
   ======================================================== */

.mbf-hero-tech {
    position: relative;
    background: radial-gradient(circle at 50% 20%, #172554 0%, #0a1128 80%);
    color: #ffffff;
    padding: 70px 0 60px;
    border-bottom: 1px solid var(--border-dark);
    overflow: hidden;
}

.mbf-hero-grid-pattern {
    position: absolute;
    inset: 0;
    background-image: linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
}

.mbf-hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 860px;
    margin: 0 auto;
}

.mbf-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(0, 210, 255, 0.12);
    border: 1px solid rgba(0, 210, 255, 0.3);
    color: var(--accent-cyan);
    font-size: 0.85rem;
    font-weight: 700;
    padding: 6px 16px;
    border-radius: 30px;
    margin-bottom: 20px;
    box-shadow: 0 0 15px rgba(0, 210, 255, 0.2);
}

.mbf-hero-title {
    font-size: 2.75rem;
    font-weight: 800;
    line-height: 1.25;
    letter-spacing: -1px;
    margin-bottom: 16px;
    color: #ffffff;
}

.mbf-title-gradient {
    background: linear-gradient(135deg, #ffffff 30%, var(--accent-cyan) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.mbf-hero-subtitle {
    font-size: 1.15rem;
    color: #cbd5e1;
    margin-bottom: 35px;
    line-height: 1.6;
}

/* Quick Search Hero */
.mbf-hero-search-box {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 40px;
    padding: 6px 8px 6px 20px;
    max-width: 650px;
    margin: 0 auto 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    transition: var(--transition);
}

.mbf-hero-search-box:focus-within {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 25px rgba(0, 210, 255, 0.35);
}

.mbf-hero-search-input {
    flex: 1;
    background: none;
    border: none;
    color: #ffffff;
    font-size: 1.05rem;
    outline: none;
}

.mbf-hero-search-input::placeholder {
    color: #94a3b8;
}

.mbf-hero-search-btn {
    background: linear-gradient(135deg, var(--primary), var(--accent-cyan));
    color: #ffffff;
    border: none;
    padding: 12px 26px;
    border-radius: 30px;
    font-weight: 700;
    font-size: 0.95rem;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0, 102, 204, 0.4);
    transition: var(--transition);
}

.mbf-hero-search-btn:hover {
    transform: scale(1.03);
}

/* Quick Links Pills */
.mbf-hero-quick-pills {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.mbf-quick-pill {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: #e2e8f0;
    padding: 7px 16px;
    border-radius: 20px;
    font-size: 0.88rem;
    font-weight: 600;
    transition: var(--transition);
}

.mbf-quick-pill:hover {
    background: rgba(0, 210, 255, 0.2);
    border-color: var(--accent-cyan);
    color: #ffffff;
}

/* Quick USSD Utility Bar */
.mbf-utility-bar {
    background: #0f172a;
    border-bottom: 1px solid #1e293b;
    padding: 20px 0;
}

.mbf-utility-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.mbf-utility-card {
    display: flex;
    align-items: center;
    gap: 14px;
    background: #1e293b;
    border: 1px solid #334155;
    padding: 14px 18px;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.mbf-utility-card:hover {
    border-color: var(--accent-cyan);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.mbf-utility-icon {
    font-size: 1.5rem;
}

.mbf-utility-info {
    display: flex;
    flex-direction: column;
}

.mbf-utility-name {
    font-size: 0.78rem;
    color: #94a3b8;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.mbf-utility-val {
    font-size: 1.05rem;
    font-weight: 800;
    color: #ffffff;
    letter-spacing: 0.5px;
}

/* Section Common */
.mbf-section {
    padding: 55px 0;
}

.mbf-section-header {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    margin-bottom: 30px;
    border-bottom: 2px solid #e2e8f0;
    padding-bottom: 14px;
}

.mbf-section-title-wrap {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.mbf-section-tag {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.mbf-section-title {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text-dark);
}

.mbf-view-all {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--primary);
}

.mbf-view-all:hover {
    gap: 10px;
}

/* Featured Packages High-Tech Grid */
.mbf-pkg-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.mbf-pkg-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    transition: var(--transition);
    overflow: hidden;
}

.mbf-pkg-card:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.mbf-pkg-badge-hot {
    position: absolute;
    top: 16px;
    right: 16px;
    background: var(--accent-red);
    color: #ffffff;
    font-size: 0.7rem;
    font-weight: 800;
    padding: 3px 10px;
    border-radius: 20px;
}

.mbf-pkg-name {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 8px;
}

.mbf-pkg-data {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 4px;
}

.mbf-pkg-data-hl {
    color: #0284c7;
}

.mbf-pkg-price {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 16px;
    padding-bottom: 14px;
    border-bottom: 1px dashed var(--border);
}

.mbf-pkg-features {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 0.88rem;
    color: var(--text-body);
    margin-bottom: 20px;
    flex: 1;
}

.mbf-pkg-features li {
    display: flex;
    align-items: center;
    gap: 8px;
}

.mbf-pkg-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: var(--primary);
    color: #ffffff;
    font-weight: 700;
    padding: 12px;
    border-radius: var(--radius-sm);
    text-align: center;
    box-shadow: 0 4px 12px var(--primary-glow);
    transition: var(--transition);
}

.mbf-pkg-btn:hover {
    background: var(--primary-hover);
    color: #ffffff;
    box-shadow: 0 6px 18px var(--primary-glow);
}

/* Post Cards Grid (3 Columns) */
.mbf-posts-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

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

.mbf-post-card:hover {
    border-color: #cbd5e1;
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.mbf-post-thumb-wrap {
    position: relative;
    aspect-ratio: 16 / 9;
    background: #e2e8f0;
    overflow: hidden;
}

.mbf-post-thumb-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.mbf-post-card:hover .mbf-post-thumb-wrap img {
    transform: scale(1.05);
}

.mbf-post-card-cat {
    position: absolute;
    top: 12px;
    left: 12px;
    background: rgba(0, 102, 204, 0.9);
    color: #ffffff;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 6px;
    backdrop-filter: blur(4px);
}

.mbf-post-card-body {
    padding: 18px;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.mbf-post-card-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.mbf-post-card-title {
    font-size: 1.05rem;
    font-weight: 700;
    line-height: 1.45;
    margin-bottom: 8px;
}

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

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

.mbf-post-card-excerpt {
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.55;
    margin-bottom: 14px;
    flex: 1;
}

/* ========================================================
   SINGLE POST PAGE (CONTENT + SIDEBAR + TOC)
   ======================================================== */

.mbf-single-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 340px;
    gap: 36px;
    padding: 25px 0 60px;
}

.mbf-post-main {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 36px;
    box-shadow: var(--shadow-sm);
    min-width: 0;
    max-width: 100%;
    overflow: hidden;
}

/* Post Header */
.mbf-single-cat-badge {
    display: inline-block;
    background: var(--primary-light);
    color: var(--primary);
    font-size: 0.82rem;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 20px;
    margin-bottom: 14px;
}

.mbf-single-title {
    font-size: 2.1rem;
    font-weight: 800;
    color: var(--text-dark);
    line-height: 1.35;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.mbf-single-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 0.85rem;
    color: var(--text-muted);
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.mbf-meta-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

/* Featured Image */
.mbf-single-featured-img {
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: 30px;
    box-shadow: var(--shadow-sm);
}

.mbf-single-featured-img img {
    width: 100%;
    height: auto;
    object-fit: cover;
}

/* ========================================================
   TABLE OF CONTENTS (TOC - AN BAN DAU)
   ======================================================== */

.mbf-toc-card {
    background: #f1f5f9;
    border: 1px solid #cbd5e1;
    border-left: 4px solid var(--primary);
    border-radius: var(--radius-md);
    margin: 25px 0 35px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.mbf-toc-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    cursor: pointer;
    user-select: none;
    background: #e2e8f0;
    transition: var(--transition);
}

.mbf-toc-header:hover {
    background: #cbd5e1;
}

.mbf-toc-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-dark);
}

.mbf-toc-icon {
    display: flex;
    color: var(--primary);
}

.mbf-toc-toggle-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: #ffffff;
    border: 1px solid #cbd5e1;
    padding: 5px 12px;
    border-radius: 16px;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--primary);
    cursor: pointer;
    transition: var(--transition);
}

.mbf-toc-chevron {
    transition: transform 0.3s ease;
}

.mbf-toc-card.active .mbf-toc-chevron {
    transform: rotate(180deg);
}

.mbf-toc-nav {
    padding: 16px 20px 20px;
}

.mbf-toc-list {
    list-style: decimal inside;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.mbf-toc-list li {
    font-size: 0.93rem;
    line-height: 1.5;
}

.mbf-toc-list li a {
    color: #334155;
    font-weight: 500;
}

.mbf-toc-list li a:hover {
    color: var(--primary);
    text-decoration: underline;
}

.mbf-toc-sub {
    margin-left: 20px;
    list-style-type: circle;
}

/* Article Body Typography */
.mbf-article-content {
    font-size: 1.06rem;
    line-height: 1.8;
    color: #1e293b;
}

.mbf-article-content h2 {
    font-size: 1.55rem;
    font-weight: 800;
    color: var(--text-dark);
    margin: 35px 0 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid #e2e8f0;
    scroll-margin-top: 90px;
}

.mbf-article-content h3 {
    font-size: 1.28rem;
    font-weight: 700;
    color: #0f172a;
    margin: 25px 0 12px;
    scroll-margin-top: 90px;
}

.mbf-article-content p {
    margin-bottom: 18px;
}

.mbf-article-content ul, .mbf-article-content ol {
    margin-bottom: 20px;
    padding-left: 24px;
}

.mbf-article-content li {
    margin-bottom: 8px;
}

.mbf-article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 25px 0;
    font-size: 0.95rem;
}

.mbf-article-content th, .mbf-article-content td {
    padding: 12px 14px;
    border: 1px solid var(--border);
    text-align: left;
}

.mbf-article-content th {
    background: #f1f5f9;
    font-weight: 700;
    color: var(--text-dark);
}

.mbf-article-content blockquote {
    border-left: 4px solid var(--primary);
    background: #f8fafc;
    padding: 16px 20px;
    margin: 24px 0;
    font-style: italic;
    color: #475569;
}

/* Responsive Image & Caption System */
.mbf-article-content {
    overflow-wrap: break-word;
    word-break: break-word;
}

.mbf-article-content * {
    max-width: 100%;
}

.mbf-article-content img,
.mbf-article-content .wp-caption img,
.mbf-article-content figure img,
.mbf-article-content .wp-block-image img {
    max-width: 100% !important;
    height: auto !important;
    display: block;
    margin: 18px auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.mbf-article-content .wp-caption,
.mbf-article-content figure,
.mbf-article-content .wp-block-image {
    max-width: 100% !important;
    width: auto !important;
    margin: 24px auto !important;
    clear: both;
    text-align: center;
    box-sizing: border-box;
}

.mbf-article-content .wp-caption.aligncenter,
.mbf-article-content .aligncenter {
    display: block;
    margin-left: auto !important;
    margin-right: auto !important;
    text-align: center;
}

.mbf-article-content .wp-caption.alignleft,
.mbf-article-content .alignleft {
    float: left;
    margin: 10px 24px 20px 0;
    max-width: 50% !important;
}

.mbf-article-content .wp-caption.alignright,
.mbf-article-content .alignright {
    float: right;
    margin: 10px 0 20px 24px;
    max-width: 50% !important;
}

.mbf-article-content .wp-caption-text,
.mbf-article-content figcaption {
    font-size: 0.88rem;
    color: var(--text-muted);
    font-style: italic;
    text-align: center;
    margin-top: 8px;
    line-height: 1.45;
}

@media (max-width: 768px) {
    .mbf-article-content .wp-caption.alignleft,
    .mbf-article-content .wp-caption.alignright,
    .mbf-article-content .alignleft,
    .mbf-article-content .alignright {
        float: none !important;
        max-width: 100% !important;
        margin: 18px auto !important;
    }
}

/* ========================================================
   RELATED POSTS (DUOI BAI VIET)
   ======================================================== */

.mbf-related-section {
    margin-top: 45px;
    padding-top: 30px;
    border-top: 2px solid #e2e8f0;
}

.mbf-related-title {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.mbf-related-card {
    background: var(--bg-page);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: var(--transition);
}

.mbf-related-card:hover {
    border-color: var(--primary);
    transform: translateY(-3px);
}

.mbf-related-thumb {
    aspect-ratio: 16 / 9;
    background: #e2e8f0;
    overflow: hidden;
}

.mbf-related-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.mbf-related-body {
    padding: 12px;
}

.mbf-related-card-title {
    font-size: 0.92rem;
    font-weight: 700;
    line-height: 1.4;
}

.mbf-related-card-title a {
    color: var(--text-dark);
}

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

/* ========================================================
   SIDEBAR (BAI VIET XEM NHIEU, MOI NHAT, DANH MUC)
   ======================================================== */

.mbf-sidebar {
    display: flex;
    flex-direction: column;
    gap: 26px;
}

.mbf-sidebar-sticky {
    position: sticky;
    top: 90px;
    display: flex;
    flex-direction: column;
    gap: 26px;
}

.mbf-widget {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 22px;
    box-shadow: var(--shadow-sm);
}

.mbf-widget-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 18px;
    padding-bottom: 12px;
    border-bottom: 2px solid #e2e8f0;
}

.mbf-widget-title {
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--text-dark);
}

.mbf-widget-icon {
    font-size: 1.1rem;
}

/* Popular Posts Widget (Numbered Ranking) */
.mbf-popular-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.mbf-popular-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.mbf-rank-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 800;
    flex-shrink: 0;
}

.mbf-rank-1 { background: #f59e0b; color: #ffffff; }
.mbf-rank-2 { background: #94a3b8; color: #ffffff; }
.mbf-rank-3 { background: #b45309; color: #ffffff; }
.mbf-rank-4, .mbf-rank-5 { background: #f1f5f9; color: #475569; }

.mbf-popular-content {
    flex: 1;
}

.mbf-popular-title {
    font-size: 0.92rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 4px;
}

.mbf-popular-title a {
    color: var(--text-dark);
}

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

.mbf-popular-views {
    font-size: 0.78rem;
    color: var(--text-muted);
}

/* Recent Posts Widget */
.mbf-recent-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.mbf-recent-item {
    display: flex;
    gap: 12px;
}

.mbf-recent-thumb {
    width: 72px;
    height: 52px;
    border-radius: 6px;
    overflow: hidden;
    flex-shrink: 0;
    background: #e2e8f0;
}

.mbf-recent-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.mbf-recent-content {
    flex: 1;
}

.mbf-recent-title {
    font-size: 0.88rem;
    font-weight: 600;
    line-height: 1.35;
    margin-bottom: 4px;
}

.mbf-recent-title a {
    color: var(--text-dark);
}

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

.mbf-recent-date {
    font-size: 0.75rem;
    color: var(--text-muted);
}

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

.mbf-cat-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 9px 12px;
    border-radius: var(--radius-sm);
    background: var(--bg-page);
    color: var(--text-dark);
    font-size: 0.9rem;
    font-weight: 600;
    transition: var(--transition);
}

.mbf-cat-link:hover {
    background: var(--primary-light);
    color: var(--primary);
    transform: translateX(4px);
}

.mbf-cat-count {
    background: #e2e8f0;
    color: #475569;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 12px;
}

/* ========================================================
   CATEGORY ARCHIVE PAGE (FULL-WIDTH - KHONG CO SIDEBAR)
   ======================================================== */

.mbf-archive-hero {
    background: linear-gradient(135deg, #0a1128, #172554);
    color: #ffffff;
    padding: 45px 0 35px;
    border-bottom: 1px solid var(--border-dark);
    margin-bottom: 40px;
}

.mbf-archive-hero-inner {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.mbf-archive-tag {
    display: inline-block;
    background: rgba(0, 210, 255, 0.15);
    color: var(--accent-cyan);
    font-size: 0.8rem;
    font-weight: 700;
    padding: 4px 14px;
    border-radius: 20px;
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.mbf-archive-title {
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: 12px;
    letter-spacing: -0.5px;
}

.mbf-archive-desc {
    font-size: 1.05rem;
    color: #cbd5e1;
    line-height: 1.6;
}

.mbf-archive-stats {
    margin-top: 14px;
    font-size: 0.88rem;
    color: var(--accent-cyan);
    font-weight: 600;
}

/* Full-width Category Grid (NO SIDEBAR) */
.mbf-archive-fullwidth {
    padding-bottom: 60px;
}

/* Pagination */
.mbf-pagination {
    margin-top: 45px;
    display: flex;
    justify-content: center;
    gap: 8px;
}

.mbf-pagination .page-numbers {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 14px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-dark);
    font-weight: 700;
    font-size: 0.95rem;
    transition: var(--transition);
}

.mbf-pagination .page-numbers:hover,
.mbf-pagination .page-numbers.current {
    background: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
}

/* ========================================================
   FOOTER STYLES
   ======================================================== */

.mbf-footer {
    background: var(--bg-dark);
    color: #cbd5e1;
    border-top: 1px solid var(--border-dark);
}

.mbf-footer-top {
    padding: 60px 0 45px;
}

.mbf-footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1.2fr 1.2fr;
    gap: 40px;
}

.mbf-footer-desc {
    font-size: 0.9rem;
    line-height: 1.65;
    margin: 16px 0;
    color: #94a3b8;
}

.mbf-tech-stats {
    margin-top: 10px;
}

.mbf-stat-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(0, 210, 255, 0.1);
    color: var(--accent-cyan);
    font-size: 0.8rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 12px;
}

.mbf-stat-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent-cyan);
}

.mbf-footer-title {
    font-size: 1.1rem;
    font-weight: 800;
    color: #ffffff;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 8px;
}

.mbf-footer-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background: var(--accent-cyan);
}

.mbf-footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
    font-size: 0.9rem;
}

.mbf-footer-links a {
    color: #94a3b8;
}

.mbf-footer-links a:hover {
    color: var(--accent-cyan);
    padding-left: 4px;
}

.mbf-syntax-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    font-size: 0.88rem;
}

.mbf-syntax-item {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.mbf-syntax-label {
    font-size: 0.78rem;
    color: #94a3b8;
}

.mbf-code {
    background: #1e293b;
    color: #38bdf8;
    padding: 3px 8px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.85rem;
    border: 1px solid #334155;
    display: inline-block;
}

.mbf-contact-card {
    display: flex;
    align-items: center;
    gap: 12px;
    background: #131d38;
    border: 1px solid #1e294b;
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
}

.mbf-contact-icon {
    font-size: 1.4rem;
}

.mbf-contact-detail {
    display: flex;
    flex-direction: column;
}

.mbf-contact-sub {
    font-size: 0.75rem;
    color: #94a3b8;
}

.mbf-contact-val {
    font-size: 1.1rem;
    font-weight: 800;
    color: #00e5ff;
}

.mbf-footer-bottom {
    border-top: 1px solid var(--border-dark);
    padding: 20px 0;
    font-size: 0.85rem;
    color: #64748b;
}

.mbf-footer-bottom-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Back to top button */
.mbf-back-to-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 44px;
    height: 44px;
    background: var(--primary);
    color: #ffffff;
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px var(--primary-glow);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

.mbf-back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.mbf-back-to-top:hover {
    background: var(--accent-cyan);
    color: #000;
    transform: translateY(-4px);
}

/* ========================================================
   RESPONSIVE DESIGN (IPAD & MOBILE)
   ======================================================== */

/* Tablet & iPad (768px - 1024px) */
@media (max-width: 1024px) {
    .mbf-single-layout {
        grid-template-columns: 1fr;
    }

    .mbf-sidebar-sticky {
        position: static;
    }

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

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

    .mbf-footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }

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

    .mbf-archive-fullwidth .mbf-posts-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Mobile (< 768px) */
@media (max-width: 768px) {
    .mbf-nav-desktop,
    .mbf-search-trigger-text,
    .mbf-kbd,
    .mbf-hotline-badge {
        display: none;
    }

    .mbf-burger {
        display: flex;
    }

    .mbf-hero-title {
        font-size: 1.85rem;
    }

    .mbf-hero-subtitle {
        font-size: 0.95rem;
    }

    .mbf-hero-search-box {
        flex-direction: column;
        gap: 10px;
        padding: 10px;
        border-radius: var(--radius-md);
    }

    .mbf-hero-search-btn {
        width: 100%;
    }

    .mbf-utility-grid {
        grid-template-columns: 1fr;
    }

    .mbf-pkg-grid {
        grid-template-columns: 1fr;
    }

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

    .mbf-archive-fullwidth .mbf-posts-grid {
        grid-template-columns: 1fr;
    }

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

    .mbf-footer-grid {
        grid-template-columns: 1fr;
    }

    .mbf-footer-bottom-inner {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }

    .mbf-post-main {
        padding: 20px 16px;
    }

    .mbf-single-title {
        font-size: 1.5rem;
    }
}