/* Reset & Base Variables */
:root {
    --primary-color: #059669; /* Xanh lá mặn mà, tin cậy */
    --primary-dark: #047857;
    --primary-light: #d1fae5;
    --secondary-color: #1e3a8a; /* Xanh dương đậm cho sự chuyên nghiệp */
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --bg-light: #f8fafc;
    --white: #ffffff;
    --border-color: #e5e7eb;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --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-glow: 0 0 20px rgba(5, 150, 105, 0.4);
    
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth; /* Cuộn mượt khi bấm menu */
}

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-main);
    line-height: 1.6;
    background-color: var(--white);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Inter', sans-serif;
    color: var(--secondary-color);
    line-height: 1.2;
}

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

ul {
    list-style: none;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section-padding {
    padding: 5rem 0;
}

.bg-light {
    background-color: var(--bg-light);
}

.text-center {
    text-align: center;
}

/* Typography & Utilities */
.highlight {
    color: var(--primary-color);
}

.mt-4 { margin-top: 1.5rem; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius-full);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

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

.btn-secondary:hover {
    background-color: #172554;
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    color: var(--white);
    border: 2px solid var(--white);
}

.btn-outline:hover {
    background-color: var(--white);
    color: var(--secondary-color);
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    opacity: 0; /* Sẽ được JS kích hoạt hoặc dùng animation-fill-mode */
    animation: fadeInUp 0.8s ease forwards;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }

@keyframes pulse {
    0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(5, 150, 105, 0.7); }
    70% { transform: scale(1.05); box-shadow: 0 0 0 15px rgba(5, 150, 105, 0); }
    100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(5, 150, 105, 0); }
}

.pulse-effect {
    animation: pulse 2s infinite;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    padding: 1rem 0;
}

.navbar.scrolled {
    padding: 0.5rem 0;
    box-shadow: var(--shadow-md);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.logo a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-family: 'Inter', sans-serif;
    color: var(--secondary-color);
}

.logo-text {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    line-height: 1.1;
}

.logo-text span {
    font-size: 1.1rem;
    font-weight: 500;
}

.logo-text b {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--primary-color);
    text-transform: uppercase;
    white-space: nowrap;
}

.logo i {
    font-size: 3rem;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-tab {
    font-weight: 700;
    color: var(--text-muted);
    position: relative;
    padding-bottom: 0.25rem;
    white-space: nowrap;
    text-transform: uppercase;
    font-size: 0.95rem;
}

.nav-tab::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

.nav-tab:hover, .nav-tab.active {
    color: var(--primary-color);
}

.nav-tab:hover::after, .nav-tab.active::after {
    width: 100%;
}

.btn-hotline {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-full);
    font-weight: 800;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.1rem;
    box-shadow: var(--shadow-md);
    white-space: nowrap;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--secondary-color);
    cursor: pointer;
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background-image: url('../assets/1779581316242_1.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed; /* Parallax effect */
    padding-top: 80px;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(30, 58, 138, 0.9) 0%, rgba(5, 150, 105, 0.7) 100%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 4rem;
}

.hero-img {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 5px solid rgba(255, 255, 255, 0.2);
}

.hero-img img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: calc(var(--radius-lg) - 5px);
}

.hero-text {
    color: var(--white);
    max-width: 700px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.badge {
    display: inline-block;
    background-color: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(5px);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.hero-text h1 {
    font-size: clamp(2rem, 4vw, 4rem);
    color: var(--white);
    margin-bottom: 1.5rem;
    text-align: center;
}

.hero-text .highlight {
    color: var(--primary-light);
}

.hero-text p {
    font-size: 1.125rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    text-align: center;
    width: 100%;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

.hero-stats {
    display: flex;
    gap: 1.5rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 2rem;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    align-self: flex-end;
    margin-top: 2rem;
}

.stat {
    color: var(--white);
}

.stat h3 {
    font-size: 2.5rem;
    color: var(--white);
    display: flex;
    align-items: baseline;
    gap: 0.25rem;
}

.stat h3 span {
    font-size: 1rem;
    font-weight: 400;
}

.stat p {
    font-size: 0.875rem;
    opacity: 0.8;
}

/* Services (Tabs) */
.section-title {
    margin-bottom: 3rem;
}

.section-title h2 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.section-title p {
    color: var(--text-muted);
}

.service-tabs-nav {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 1rem 2rem;
    background-color: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: 'Inter', sans-serif;
}

.tab-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.tab-btn.active {
    background-color: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.tab-pane {
    display: none;
    animation: fadeEffect 0.5s;
}

.tab-pane.active {
    display: block;
}

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

.tab-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

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

.tab-img img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    transition: transform 0.5s;
}

.tab-img:hover img {
    transform: scale(1.05);
}

.img-badge {
    position: absolute;
    bottom: 20px;
    left: 20px;
    background-color: var(--white);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-full);
    font-weight: 600;
    color: var(--secondary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: var(--shadow-md);
}

.img-badge i {
    color: var(--primary-color);
    font-size: 1.25rem;
}

.tab-info h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.tab-info p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    font-weight: 500;
}

.feature-list i {
    color: var(--primary-color);
    font-size: 1.5rem;
}

/* Video Section */
.video-wrapper {
    max-width: 800px;
    margin: 0 auto;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background-color: var(--secondary-color);
    position: relative;
}

.video-wrapper video {
    width: 100%;
    display: block;
}

.video-notice {
    padding: 1rem;
    background-color: var(--primary-light);
    color: var(--primary-dark);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Why Us Section */
.why-us-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.why-us-text h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.why-us-text > p {
    color: var(--text-muted);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.benefit-item {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    background-color: var(--bg-light);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.benefit-item:hover {
    background-color: var(--white);
    box-shadow: var(--shadow-md);
    transform: translateX(10px);
}

.benefit-item .icon {
    width: 50px;
    height: 50px;
    background-color: var(--primary-light);
    color: var(--primary-color);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.benefit-item h4 {
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
}

.benefit-item p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.why-us-image {
    position: relative;
    height: 500px;
}

.image-stack {
    position: relative;
    height: 100%;
}

.img-back {
    position: absolute;
    top: 0;
    right: 0;
    width: 80%;
    height: 80%;
    object-fit: cover;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.img-front {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 70%;
    height: 70%;
    object-fit: cover;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 10px solid var(--white);
    z-index: 2;
}

.experience-badge {
    position: absolute;
    top: 50%;
    left: -20px;
    transform: translateY(-50%);
    background-color: var(--primary-color);
    color: var(--white);
    width: 120px;
    height: 120px;
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 3;
    box-shadow: var(--shadow-glow);
    border: 5px solid var(--white);
    text-align: center;
}

.experience-badge strong {
    font-size: 2.5rem;
    line-height: 1;
    font-family: 'Inter', sans-serif;
}

.experience-badge span {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

/* Footer */
.footer {
    background-color: var(--secondary-color);
    color: var(--white);
    padding: 4rem 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-logo {
    color: var(--white) !important;
    margin-bottom: 1.5rem;
}

.footer-logo i {
    color: var(--primary-light);
}

.footer-about p {
    color: #cbd5e1;
}

.footer-links h3, .footer-contact h3 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: var(--white);
}

.footer-links ul li {
    margin-bottom: 0.75rem;
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    color: #cbd5e1;
}

.footer-links ul li i {
    color: var(--primary-color);
    margin-top: 0.25rem;
}

.contact-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    background-color: rgba(255, 255, 255, 0.05);
    padding: 1rem;
    border-radius: var(--radius-md);
}

.contact-card i {
    font-size: 2rem;
    color: var(--primary-color);
}

.contact-card span {
    display: block;
    font-size: 0.85rem;
    color: #cbd5e1;
}

.contact-card strong a {
    font-size: 1.25rem;
    color: var(--white);
    font-family: 'Inter', sans-serif;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 1.5rem 0;
    text-align: center;
    color: #94a3b8;
    font-size: 0.9rem;
}

/* Mobile Fixed Call Button */
.mobile-fixed-call {
    display: none;
    position: fixed;
    bottom: 20px;
    left: 20px;
    background-color: var(--primary-color);
    color: var(--white);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-full);
    font-weight: 700;
    z-index: 999;
    align-items: center;
    gap: 0.5rem;
    box-shadow: var(--shadow-lg);
    border: 2px solid var(--white);
}

.mobile-fixed-call i {
    font-size: 1.5rem;
}

.ripple {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    border-radius: var(--radius-full);
    background-color: var(--primary-color);
    z-index: -1;
    animation: ripple 2s infinite ease-in-out;
}

@keyframes ripple {
    0% { transform: scale(1); opacity: 0.8; }
    100% { transform: scale(1.5); opacity: 0; }
}

/* ============================================
   RESPONSIVE - TABLET (max-width: 992px)
   ============================================ */
@media (max-width: 992px) {
    .tab-grid, .why-us-grid, .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .why-us-image {
        margin-top: 2rem;
        order: -1;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }
    
    .hero-text {
        margin: 0 auto;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
        align-self: center;
        flex-wrap: wrap;
    }
    
    .section-title h2 {
        font-size: 2rem;
    }
}

/* ============================================
   RESPONSIVE - MOBILE (max-width: 768px)
   ============================================ */
@media (max-width: 768px) {
    /* --- Navbar --- */
    .navbar {
        padding: 0.5rem 0;
    }
    
    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--white);
        flex-direction: column;
        gap: 0;
        box-shadow: var(--shadow-lg);
        display: none;
        border-top: 2px solid var(--primary-color);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-tab {
        padding: 1rem 1.5rem;
        border-bottom: 1px solid var(--border-color);
        font-size: 0.9rem;
    }
    
    .nav-tab::after { display: none; }
    
    .mobile-menu-btn { display: block; }
    
    .nav-action { display: none; }
    
    /* --- Hero Section --- */
    .hero {
        min-height: auto;
        padding-top: 70px;
        padding-bottom: 2rem;
        background-attachment: scroll; /* Tắt parallax trên mobile (mượt hơn) */
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        padding-top: 1.5rem;
        padding-bottom: 1rem;
    }
    
    .hero-img {
        max-width: 320px;
        margin: 0 auto;
        border-width: 3px;
    }
    
    .hero-text h1 {
        font-size: 1.75rem;
        line-height: 1.3;
        margin-bottom: 1rem;
    }
    
    .hero-text p {
        font-size: 0.95rem;
        margin-bottom: 1.5rem;
    }
    
    .badge {
        font-size: 0.8rem;
        padding: 0.4rem 0.8rem;
        margin-bottom: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        width: 100%;
        gap: 0.75rem;
    }
    
    .hero-buttons .btn {
        width: 100%;
        padding: 1rem;
        font-size: 1rem;
        justify-content: center;
    }
    
    /* --- Section Padding & Titles --- */
    .section-padding {
        padding: 3rem 0;
    }
    
    .section-title {
        margin-bottom: 2rem;
    }
    
    .section-title h2 {
        font-size: 1.5rem;
        line-height: 1.3;
    }
    
    .section-title p {
        font-size: 0.9rem;
    }
    
    /* --- Service Tabs Nav --- */
    .service-tabs-nav {
        flex-direction: column;
        gap: 0.75rem !important;
    }
    
    .service-tabs-nav .btn {
        width: 100%;
        justify-content: center;
        padding: 1rem;
    }
    
    .tab-btn {
        width: 100%;
        justify-content: center;
        font-size: 1rem;
    }
    
    /* --- Tab Grid (Service Pages) --- */
    .tab-grid {
        gap: 2rem;
    }
    
    .tab-img img {
        height: 250px;
    }
    
    .tab-info h3 {
        font-size: 1.4rem;
    }
    
    .tab-info p {
        font-size: 0.95rem;
    }

    /* --- Pricing Table (responsive trên mobile) --- */
    .pricing-table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        font-size: 0.9rem;
    }
    
    .pricing-table th,
    .pricing-table td {
        padding: 0.75rem 0.65rem;
        white-space: normal;
        word-break: break-word;
    }
    
    /* --- Video Section --- */
    .video-wrapper {
        max-width: 100%;
        background-color: transparent !important;
        box-shadow: none !important;
        overflow: visible;
    }
    
    .video-wrapper iframe {
        width: 100% !important;
        max-width: 315px;
        height: auto !important;
        aspect-ratio: 9 / 16;
        margin: 0 auto;
        display: block;
    }
    
    /* --- Why Us Section --- */
    .why-us-text h2 {
        font-size: 1.5rem;
    }
    
    .why-us-text > p {
        font-size: 0.95rem;
    }
    
    .benefit-item {
        padding: 1rem;
        gap: 1rem;
    }
    
    .benefit-item .icon {
        width: 42px;
        height: 42px;
        font-size: 1.25rem;
    }
    
    .benefit-item h4 {
        font-size: 1.1rem;
    }
    
    .benefit-item p {
        font-size: 0.85rem;
    }
    
    /* --- Image Stack (Why Us) => chuyển thành đơn giản trên mobile --- */
    .why-us-image {
        height: auto;
        margin-top: 1rem;
    }
    
    .image-stack {
        position: relative;
        height: auto;
        display: flex;
        flex-direction: column;
        gap: 1rem;
        align-items: center;
    }
    
    .img-back {
        position: relative;
        top: auto;
        right: auto;
        width: 100%;
        height: 250px;
        border-radius: var(--radius-lg);
    }
    
    .img-front {
        position: relative;
        bottom: auto;
        left: auto;
        width: 85%;
        height: auto;
        border-width: 5px;
        margin-top: -3rem;
        z-index: 2;
    }
    
    .experience-badge {
        position: absolute;
        top: auto;
        bottom: -15px;
        left: 50%;
        transform: translateX(-50%);
        width: 90px;
        height: 90px;
    }
    
    .experience-badge strong {
        font-size: 1.75rem;
    }
    
    .experience-badge span {
        font-size: 0.6rem;
    }
    
    /* --- Contact Box (Trang Liên Hệ) --- */
    .contact-box {
        padding: 1.5rem 1rem;
    }
    
    .contact-box h3 {
        font-size: 1.35rem;
        line-height: 1.3;
    }
    
    .contact-box .hotline {
        font-size: 1.75rem;
    }
    
    /* --- Footer --- */
    .footer {
        padding: 3rem 0 0;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
        margin-bottom: 2rem;
        text-align: center;
    }
    
    .footer-logo {
        justify-content: center;
    }
    
    .footer-links h3,
    .footer-contact h3 {
        font-size: 1.15rem;
        margin-bottom: 1rem;
    }
    
    .footer-links ul li {
        justify-content: center;
        text-align: left;
    }
    
    .contact-card {
        justify-content: center;
    }
    
    .footer-bottom {
        font-size: 0.8rem;
        padding: 1rem 0;
    }
    
    /* --- Mobile Fixed Call Button (Thanh CTA cố định dưới cùng) --- */
    .mobile-fixed-call {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
        color: var(--white);
        padding: 0.85rem 1.25rem;
        border-radius: 0;
        font-weight: 700;
        z-index: 999;
        align-items: center;
        justify-content: center;
        gap: 0.5rem;
        box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.2);
        border: none;
        font-size: 1.1rem;
        letter-spacing: 0.5px;
    }
    
    .mobile-fixed-call i {
        font-size: 1.4rem;
        animation: shake 1.5s infinite;
    }
    
    .mobile-fixed-call .ripple {
        display: none;
    }
    
    /* Đẩy nội dung lên để không bị che bởi thanh CTA cố định */
    body {
        padding-bottom: 60px;
    }

    /* --- Các trang dịch vụ: giảm padding-top cho mobile --- */
    section[style*="padding-top: 150px"] {
        padding-top: 90px !important;
    }
}

/* ============================================
   RESPONSIVE - MOBILE NHỎ (max-width: 480px)
   ============================================ */
@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    .hero-text h1 {
        font-size: 1.5rem;
    }
    
    .section-title h2 {
        font-size: 1.3rem;
    }
    
    .why-us-text h2 {
        font-size: 1.3rem;
    }
    
    .tab-info h3 {
        font-size: 1.2rem;
    }
    
    .pricing-table th,
    .pricing-table td {
        padding: 0.6rem 0.5rem;
        font-size: 0.82rem;
    }
    
    .contact-box h3 {
        font-size: 1.2rem;
    }
    
    .contact-box .hotline {
        font-size: 1.5rem;
    }
    
    .img-back {
        height: 200px;
    }
    
    .btn {
        font-size: 0.9rem;
        padding: 0.75rem 1.25rem;
    }
}

/* Phone icon shake animation for CTA */
@keyframes shake {
    0%, 100% { transform: rotate(0deg); }
    10% { transform: rotate(-15deg); }
    20% { transform: rotate(15deg); }
    30% { transform: rotate(-10deg); }
    40% { transform: rotate(10deg); }
    50% { transform: rotate(0deg); }
}