/* ==========================================
   DESIGN SYSTEM & VARIABLES
   ========================================== */
:root {
    /* Colors */
    --primary: #d4af37;        /* Gold */
    --primary-hover: #b8901c;
    --secondary: #1a2530;      /* Dark Blue-Gray */
    --dark-bg: #111827;
    --light-bg: #f8f9fa;
    --white: #ffffff;
    
    --text-main: #374151;      /* Charcoal */
    --text-heading: #111827;   /* Near Black */
    --text-muted: #6b7280;     /* Cool Gray */
    --border-color: #e5e7eb;
    
    /* Typography */
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Manrope', sans-serif;
    
    /* Shadows & Transitions */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --shadow-premium: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
    
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Layout */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;
    --container-width: 1200px;
}

/* ==========================================
   RESET & BASICS
   ========================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

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

body {
    font-family: var(--font-body);
    font-weight: 400;
    line-height: 1.6;
    color: var(--text-main);
    background-color: var(--white);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--text-heading);
    line-height: 1.25;
}

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

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

ul {
    list-style: none;
}

/* ==========================================
   REUSABLE COMPONENTS
   ========================================== */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: var(--radius-full);
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition-normal);
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(212, 175, 55, 0.3);
}

.btn-secondary {
    background-color: transparent;
    color: var(--secondary);
    border-color: var(--secondary);
}

.btn-secondary:hover {
    background-color: var(--secondary);
    color: var(--white);
    transform: translateY(-2px);
}

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

.btn-white:hover {
    background-color: var(--primary);
    color: var(--white);
    transform: translateY(-2px);
}

.btn-block {
    display: flex;
    width: 100%;
}

.section-padding {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 50px;
}

.section-subtitle {
    font-family: var(--font-heading);
    color: var(--primary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.85rem;
    margin-bottom: 10px;
    display: block;
}

.section-title {
    font-size: 2.25rem;
    margin-bottom: 15px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background-color: var(--primary);
    margin: 15px auto 0;
}

.section-desc {
    color: var(--text-muted);
    font-size: 1.05rem;
}

/* ==========================================
   HEADER & NAVIGATION
   ========================================== */
.topbar {
    background-color: var(--secondary);
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.85rem;
    padding: 8px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.topbar-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 15px;
}

.topbar-left i {
    color: var(--primary);
}

.topbar-left .separator {
    color: rgba(255, 255, 255, 0.2);
}

.topbar-hotline {
    font-weight: 700;
    color: var(--primary) !important;
}

.main-header {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: var(--transition-normal);
}

.header-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
}

.logo-link img {
    height: 60px;
    width: auto;
    transition: var(--transition-normal);
}

.nav-menu ul {
    display: flex;
    align-items: center;
    gap: 30px;
}

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

.nav-menu ul li a {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-heading);
    padding: 10px 0;
    display: block;
}

.nav-menu ul li a:hover,
.nav-menu ul li.active a {
    color: var(--primary);
}

/* Dropdown Menu */
.nav-menu ul li.has-dropdown > a i {
    font-size: 0.75rem;
    margin-left: 2px;
    transition: var(--transition-fast);
}

.nav-menu ul li.has-dropdown:hover > a i {
    transform: rotate(180deg);
}

.nav-menu ul li .dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--white);
    min-width: 240px;
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-md);
    padding: 10px 0;
    display: flex;
    flex-direction: column;
    gap: 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(15px);
    transition: all 0.3s ease;
    border-top: 3px solid var(--primary);
}

.nav-menu ul li:hover .dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-menu ul li .dropdown li a {
    padding: 10px 20px;
    font-size: 0.9rem;
    font-weight: 500;
}

.nav-menu ul li .dropdown li a:hover {
    background-color: var(--light-bg);
    padding-left: 25px;
}

.header-action {
    display: flex;
    align-items: center;
    gap: 15px;
}

.mobile-nav-toggle {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-heading);
    cursor: pointer;
    display: none;
}

/* ==========================================
   MOBILE MENU
   ========================================== */
.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

.mobile-menu-overlay.open {
    opacity: 1;
    visibility: visible;
}

.mobile-menu-content {
    position: absolute;
    top: 0;
    right: -320px;
    width: 320px;
    height: 100%;
    background-color: var(--white);
    padding: 20px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.mobile-menu-overlay.open .mobile-menu-content {
    right: 0;
}

.mobile-menu-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 15px;
}

.mobile-logo {
    height: 40px;
    width: auto;
}

.mobile-menu-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-heading);
    cursor: pointer;
}

.mobile-nav {
    margin-top: 20px;
    flex-grow: 1;
    overflow-y: auto;
}

.mobile-nav ul li {
    margin-bottom: 5px;
}

.mobile-nav ul li a {
    display: block;
    padding: 12px 10px;
    font-family: var(--font-heading);
    font-weight: 600;
    color: var(--text-heading);
    border-radius: var(--radius-sm);
}

.mobile-nav ul li a:hover {
    background-color: var(--light-bg);
    color: var(--primary);
}

.mobile-dropdown-menu {
    padding-left: 20px;
    display: none;
}

.mobile-dropdown-parent.open .mobile-dropdown-menu {
    display: block;
}

.mobile-dropdown-toggle {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.mobile-dropdown-parent.open .mobile-dropdown-toggle i {
    transform: rotate(180deg);
}

.mobile-menu-footer {
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
}

.mobile-menu-footer p {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 15px;
}

/* ==========================================
   HERO / SLIDER
   ========================================== */
.hero {
    position: relative;
    background-color: var(--secondary);
    color: var(--white);
    overflow: hidden;
    height: 550px;
    display: flex;
    align-items: center;
}

.hero-slider {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 1s ease-in-out;
}

.slide.active {
    opacity: 0.25; /* overlay color */
    visibility: visible;
}

/* Fallback background gradients */
.slide::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, rgba(17,24,39,0.85) 0%, rgba(17,24,39,0.4) 100%);
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 650px;
}

.hero-tagline {
    font-family: var(--font-heading);
    color: var(--primary);
    font-weight: 700;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 3px;
    margin-bottom: 15px;
    display: block;
    animation: fadeInUp 0.8s ease forwards;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 20px;
    animation: fadeInUp 0.8s ease 0.2s forwards;
    opacity: 0;
}

.hero-desc {
    font-size: 1.15rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 35px;
    animation: fadeInUp 0.8s ease 0.4s forwards;
    opacity: 0;
}

.hero-btns {
    display: flex;
    gap: 15px;
    animation: fadeInUp 0.8s ease 0.6s forwards;
    opacity: 0;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==========================================
   STATS COUNTER
   ========================================== */
.stats {
    background-color: var(--white);
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-lg);
    margin-top: -60px;
    position: relative;
    z-index: 20;
    padding: 30px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.stat-item {
    text-align: center;
    border-right: 1px solid var(--border-color);
    padding: 10px 0;
}

.stat-item:last-child {
    border-right: none;
}

.stat-number {
    font-family: var(--font-heading);
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 5px;
}

.stat-label {
    font-weight: 600;
    color: var(--text-heading);
    font-size: 0.9rem;
}

/* ==========================================
   CORE SERVICES
   ========================================== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.service-card {
    background-color: var(--white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
    display: flex;
    flex-direction: column;
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-premium);
    border-color: rgba(212, 175, 55, 0.4);
}

.service-img {
    height: 180px;
    overflow: hidden;
    position: relative;
}

.service-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.service-card:hover .service-img img {
    transform: scale(1.1);
}

.service-info {
    padding: 20px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.service-info h3 {
    font-size: 1.15rem;
    margin-bottom: 10px;
}

.service-info p {
    color: var(--text-muted);
    font-size: 0.88rem;
    margin-bottom: 20px;
    flex-grow: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.service-link {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 5px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.service-link i {
    transition: var(--transition-fast);
}

.service-card:hover .service-link i {
    transform: translateX(4px);
}

/* ==========================================
   WHY CHOOSE US
   ========================================== */
.why-choose-us {
    background-color: var(--light-bg);
}

.wcu-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.wcu-img {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.wcu-img img {
    width: 100%;
    height: auto;
}

.wcu-badge {
    position: absolute;
    bottom: 25px;
    right: 25px;
    background-color: var(--primary);
    color: var(--white);
    padding: 20px 30px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    text-align: center;
}

.wcu-badge span {
    display: block;
}

.wcu-badge .badge-number {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 800;
}

.wcu-badge .badge-text {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.accordion-item {
    background-color: var(--white);
    border-radius: var(--radius-md);
    margin-bottom: 15px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: var(--transition-normal);
}

.accordion-header {
    padding: 18px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--text-heading);
    font-size: 1.05rem;
    user-select: none;
}

.accordion-header i {
    font-size: 0.85rem;
    transition: var(--transition-normal);
}

.accordion-item.active {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.accordion-item.active .accordion-header {
    background-color: rgba(212, 175, 55, 0.05);
    color: var(--primary);
}

.accordion-item.active .accordion-header i {
    transform: rotate(180deg);
    color: var(--primary);
}

.accordion-content {
    padding: 0 24px;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease-out;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.accordion-item.active .accordion-content {
    padding: 18px 24px;
    max-height: 200px;
    border-top: 1px solid var(--border-color);
}

/* ==========================================
   BRAND LOOP / MARQUEE
   ========================================== */
.brand-marquee-section {
    padding: 40px 0;
    background-color: var(--white);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.marquee-container {
    overflow: hidden;
    white-space: nowrap;
    width: 100%;
}

.marquee-content {
    display: inline-block;
    animation: marquee 25s linear infinite;
}

.marquee-content img {
    display: inline-block;
    height: 45px;
    width: auto;
    margin: 0 40px;
    opacity: 0.6;
    transition: var(--transition-fast);
}

.marquee-content img:hover {
    opacity: 1;
}

@keyframes marquee {
    from {
        transform: translate3d(0, 0, 0);
    }
    to {
        transform: translate3d(-50%, 0, 0);
    }
}

/* ==========================================
   PRICING TABLES
   ========================================== */
.pricing {
    background-color: var(--light-bg);
}

.tabs-wrapper {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 40px;
}

.tab-btn {
    padding: 10px 24px;
    border: none;
    background-color: var(--white);
    color: var(--text-heading);
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: var(--radius-full);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-fast);
}

.tab-btn.active,
.tab-btn:hover {
    background-color: var(--primary);
    color: var(--white);
}

.pricing-panel {
    display: none;
}

.pricing-panel.active {
    display: block;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.pricing-card {
    background-color: var(--white);
    border-radius: var(--radius-lg);
    padding: 40px 30px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.pricing-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.pricing-card.popular {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    position: relative;
}

.pricing-card.popular::before {
    content: 'Bán chạy nhất';
    position: absolute;
    top: 15px;
    right: 15px;
    background-color: var(--primary);
    color: var(--white);
    font-size: 0.75rem;
    font-family: var(--font-heading);
    font-weight: 700;
    padding: 4px 10px;
    border-radius: var(--radius-sm);
}

.pricing-header h3 {
    font-size: 1.35rem;
    margin-bottom: 5px;
}

.pricing-header .price {
    font-family: var(--font-heading);
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--primary);
    margin: 15px 0;
}

.pricing-header .price span {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-muted);
}

.pricing-features {
    margin: 25px 0 35px;
}

.pricing-features li {
    margin-bottom: 12px;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.pricing-features li i {
    color: var(--primary);
}

/* ==========================================
   TESTIMONIALS (REVIEWS)
   ========================================== */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.testimonial-card {
    background-color: var(--white);
    border-radius: var(--radius-md);
    padding: 30px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.test-rating {
    color: var(--primary);
    margin-bottom: 15px;
}

.test-text {
    font-size: 0.95rem;
    color: var(--text-main);
    font-style: italic;
    margin-bottom: 20px;
}

.test-user {
    display: flex;
    align-items: center;
    gap: 15px;
}

.test-avatar {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    background-color: var(--primary);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
    font-family: var(--font-heading);
}

.test-info h4 {
    font-size: 1rem;
    margin-bottom: 2px;
}

.test-info span {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ==========================================
   FOOTER
   ========================================== */
.site-footer {
    background-color: var(--secondary);
    color: rgba(255,255,255,0.7);
    padding-top: 60px;
    border-top: 4px solid var(--primary);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 2fr;
    gap: 45px;
    margin-bottom: 50px;
}

.footer-col h3 {
    color: var(--white);
    font-size: 1.15rem;
    margin-bottom: 25px;
    position: relative;
    padding-bottom: 10px;
}

.footer-col h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 35px;
    height: 2px;
    background-color: var(--primary);
}

.about-text {
    font-size: 0.9rem;
    line-height: 1.7;
    margin-top: 20px;
    margin-bottom: 25px;
}

.footer-logo {
    height: 40px;
    width: auto;
    filter: brightness(0) invert(1);
}

.social-links {
    display: flex;
    gap: 12px;
}

.social-links a {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}

.social-links a:hover {
    background-color: var(--primary);
    transform: translateY(-3px);
}

.links-col ul li {
    margin-bottom: 12px;
    font-size: 0.9rem;
}

.links-col ul li a:hover {
    color: var(--primary);
    padding-left: 5px;
}

.contact-list li {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
    font-size: 0.9rem;
    align-items: flex-start;
}

.contact-list li i {
    color: var(--primary);
    font-size: 1.1rem;
    margin-top: 3px;
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: 25px 0;
    font-size: 0.85rem;
    text-align: center;
}

.brand-link {
    color: var(--primary);
    font-weight: 600;
}

/* ==========================================
   FLOATING CONTACT ELEMENTS
   ========================================== */
.floating-contact {
    position: fixed;
    bottom: 25px;
    left: 25px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 999;
}

.float-btn {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
    position: relative;
    transition: var(--transition-normal);
}

.float-btn:hover {
    transform: scale(1.1) translateY(-3px);
}

.float-btn img {
    width: 30px;
    height: 30px;
}

.float-zalo {
    background-color: #0068ff;
}

.float-sms {
    background-color: #ff9800;
}

.float-call {
    background-color: #4caf50;
}

.phone-icon-wrapper {
    color: var(--white);
    font-size: 1.5rem;
    animation: phone-shake 1.5s infinite ease-in-out;
}

/* Animations */
@keyframes phone-shake {
    0% { transform: rotate(0); }
    10% { transform: rotate(-25deg); }
    20% { transform: rotate(25deg); }
    30% { transform: rotate(-25deg); }
    40% { transform: rotate(25deg); }
    50% { transform: rotate(0); }
    100% { transform: rotate(0); }
}

.pulse-ring {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: inherit;
    border: 2px solid inherit;
    top: 0;
    left: 0;
    animation: pulse 1.8s infinite ease-out;
    pointer-events: none;
}

.float-zalo .pulse-ring { border-color: #0068ff; }
.float-sms .pulse-ring { border-color: #ff9800; }
.float-call .pulse-ring { border-color: #4caf50; }

@keyframes pulse {
    0% { transform: scale(1); opacity: 1; }
    100% { transform: scale(1.6); opacity: 0; }
}

/* Scroll to Top */
.scroll-to-top {
    position: fixed;
    bottom: 25px;
    right: 25px;
    width: 45px;
    height: 45px;
    border-radius: var(--radius-full);
    background-color: var(--primary);
    color: var(--white);
    border: none;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
    z-index: 99;
}

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

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

/* ==========================================
   MEDIA QUERIES (RESPONSIVENESS)
   ========================================== */
@media screen and (max-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 450px;
        margin: 0 auto;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media screen and (max-width: 768px) {
    .topbar {
        display: none;
    }
    
    .nav-menu {
        display: none;
    }
    
    .mobile-nav-toggle {
        display: block;
    }
    
    .hero {
        height: 480px;
        text-align: center;
    }
    
    .hero-content {
        margin: 0 auto;
    }
    
    .hero-title {
        font-size: 2.25rem;
    }
    
    .hero-btns {
        justify-content: center;
    }
    
    .stats {
        margin-top: 0;
        border-radius: 0;
        box-shadow: none;
        border-top: 1px solid var(--border-color);
        border-bottom: 1px solid var(--border-color);
        padding: 20px 0;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    .stat-item {
        border-right: none;
    }
    
    .wcu-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .wcu-img {
        order: -1;
    }
}

@media screen and (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-btns {
        flex-direction: column;
        gap: 10px;
    }
}