/* ===== RESET & BASE STYLES ===== */
* { 
    margin: 0; 
    padding: 0; 
    box-sizing: border-box; 
}

html {
    scroll-behavior: smooth;
}

body { 
    font-family: 'Open Sans', sans-serif; 
    line-height: 1.6; 
    color: #333; 
    background-color: #f8f9fa; 
}

/* ===== MOBILE HEADER STYLES ===== */
.mobile-header {
    display: none;
    background: #fff;
    padding: 15px 20px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    align-items: center;
    justify-content: space-between;
}

.hamburger-menu {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.hamburger-menu span {
    width: 25px;
    height: 3px;
    background-color: #333;
    border-radius: 2px;
    transition: all 0.3s ease;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 10px;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: #f0f0f0;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid #ddd;
}

.logo-icon svg {
    width: 24px;
    height: 24px;
    color: #666;
}

.logo-text {
    font-size: 18px;
    font-weight: 700;
    color: #333;
    letter-spacing: 1px;
}

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

.action-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: background-color 0.3s ease;
}

.action-btn:hover {
    background-color: #f0f0f0;
}

.action-btn svg {
    width: 24px;
    height: 24px;
    color: #666;
}

/* ===== DESKTOP HEADER STYLES ===== */
.desktop-header { 
    background: #00539C; 
    color: #fff; 
    padding: 20px 0; 
    text-align: center; 
}

.desktop-header h1 { 
    font-size: 2.2em; 
    margin-bottom: 5px; 
    font-weight: 700;
}

.desktop-header p { 
    font-size: 1.2em; 
    opacity: 0.9; 
}

/* ===== NAVIGATION STYLES ===== */
.main-nav { 
    background: #0074D9; 
    padding: 15px 0; 
}

.nav-menu { 
    display: flex; 
    justify-content: right; 
    list-style: none; 
    flex-wrap: wrap;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.nav-menu li { 
    margin: 0 20px; 
}

.nav-menu li a { 
    color: #fff; 
    text-decoration: none; 
    font-weight: 600; 
    font-size: 1.1em; 
    padding: 5px 0; 
    display: block; 
    transition: color 0.3s ease;
}

.nav-menu li a:hover,
.nav-menu li a.active { 
    color: #e0f2f7; 
}

/* ===== MOBILE NAVIGATION OVERLAY ===== */
.mobile-nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    display: none;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.mobile-nav-overlay.active {
    display: flex;
    opacity: 1;
}

.mobile-nav-content {
    background: #fff;
    width: 300px;
    height: 100%;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    overflow-y: auto;
}

.mobile-nav-overlay.active .mobile-nav-content {
    transform: translateX(0);
}

.mobile-nav-header {
    padding: 20px;
    width: 100%;
    .logo-container {
        width: max-content;
        height: 3em;
        transform: translateX(-10%);
        .nav-logo {
            max-width: 50%;
            height: auto;
            img {
                width: 100%;
                height: auto;
                scale: 1.5;
            }
        }
    }
}

.close-menu {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.close-menu svg {
    width: 24px;
    height: 24px;
    color: #666;
}

.mobile-nav-menu {
    list-style: none;
    padding: 0;
    margin: 0;
}

.mobile-nav-menu li {
    border-bottom: 1px solid #eee;
}

.mobile-nav-menu li a {
    display: block;
    padding: 15px 20px;
    color: #333;
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

.mobile-nav-menu li a:hover,
.mobile-nav-menu li a.active {
    background-color: #f0f0f0;
    color: #00539C;
}

.mobile-dropdown {
    position: relative;
}

.mobile-dropdown-arrow {
    float: right;
    transition: transform 0.3s ease;
}

.mobile-dropdown-menu {
    display: none;
    list-style: none;
    padding: 0;
    margin: 0;
    background-color: #f8f9fa;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.mobile-dropdown-menu.active {
    display: block;
    max-height: 200px;
}

.mobile-dropdown-menu li a {
    padding: 12px 20px 12px 40px;
    font-size: 14px;
    color: #666;
    display: block;
    text-decoration: none;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.mobile-dropdown-menu li a:hover {
    background-color: #e9ecef;
    color: #00539C;
}

/* ===== DROPDOWN MENU ===== */
.has-dropdown { 
    position: relative; 
}

.dropdown-menu { 
    display: none; 
    position: absolute; 
    background-color: #ffffff; 
    box-shadow: 0 8px 16px rgba(0,0,0,0.2); 
    min-width: 250px; 
    z-index: 10; 
    padding: 0; 
    list-style: none; 
    top: 100%; 
    left: 0; 
    border-radius: 4px; 
    overflow: hidden;
}

.has-dropdown:hover > .dropdown-menu,
.dropdown-menu.active { 
    display: block; 
}

.dropdown-menu li { 
    margin: 0; 
}

.dropdown-menu li a { 
    padding: 10px 20px; 
    display: block; 
    font-weight: 600; 
    font-size: 0.95em; 
    color: #00539C; 
    text-decoration: none; 
    white-space: nowrap; 
    transition: background-color 0.3s ease, color 0.3s ease;
}

.dropdown-menu li a:hover { 
    background-color: #e9ecef; 
    color: #0074D9; 
}

.dropdown-arrow { 
    font-size: 0.6em; 
    margin-left: 5px; 
    vertical-align: middle; 
    display: inline-block; 
    line-height: 1; 
    color: #fff; 
    transition: transform 0.3s ease;
}

/* ===== HERO SECTION ===== */
.hero { 
    position: relative; 
    background: linear-gradient(to right, rgba(255,255,255,0.65), rgba(255,255,255,0)), url('image/background1.jpg') no-repeat center center/cover; 
    height: 450px; 
    display: flex; 
    align-items: center; 
    justify-content: flex-start; 
    color: #00539C; 
    text-align: left; 
}

.hero .overlay { 
    position: absolute; 
    top: 0; 
    left: 0; 
    right: 0; 
    bottom: 0; 
    background: linear-gradient(to right, rgba(255,255,255,0.65), rgba(255,255,255,0)); 
    z-index: 1; 
}

.hero-text { 
    position: relative; 
    z-index: 2; 
    margin-left: 50px; 
    margin-top: -90px; 
}

.hero h1 { 
    font-size: 3em; 
    font-weight: 900; 
    margin-bottom: 15px; 
    text-shadow: 1px 1px 0 #fff; 
    line-height: 1.2; 
}

.hero h1 .small-text { 
    font-size: 1em; 
    font-weight: 500; 
}

.hero h1 .big-text { 
    font-size: 1.7em; 
    font-weight: 900; 
    display: block; 
}

/* ===== COMMON SECTIONS ===== */
.section { 
    padding: 60px 20px; 
    max-width: 1200px; 
    margin: 0 auto; 
    font-size: 1.1em; 
    display: block; 
}

.section h2 { 
    text-align: center; 
    margin-bottom: 30px; 
    color: #00539C; 
    font-size: 1.8em;
    font-weight: 700;
}

/* ===== WHY CHOOSE SECTION ===== */
.why-choose-section { 
    background-color: #f8f9fa; 
    padding: 40px 20px 60px 20px; 
    text-align: center; 
}

.why-choose-section h2 { 
    font-size: 1.8em; 
    color: #00539C; 
    margin-bottom: 5px; 
    font-weight: 700; 
}

.why-choose-section h2 .light-text { 
    color: #666; 
    font-weight: 700; 
}

.why-choose-section p.subtitle { 
    font-size: 1em; 
    color: #555; 
    margin-bottom: 30px; 
}

.benefits-container { 
    display: flex; 
    justify-content: center; 
    flex-wrap: wrap; 
    gap: 30px; 
    max-width: 1200px; 
    margin: 0 auto; 
}

.benefit-item { 
    flex: 0 0 calc(25% - 22.5px); 
    max-width: 280px; 
    text-align: center; 
}

.benefit-item .icon-circle { 
    width: 100px; 
    height: 100px; 
    border: 2px solid #0074D9; 
    border-radius: 50%; 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    margin: 0 auto 15px auto; 
    transition: all 0.3s ease; 
}

.benefit-item .icon-circle svg { 
    width: 50px; 
    height: 50px; 
    stroke: #0074D9; 
    stroke-width: 1.5; 
    fill: none; 
}

.benefit-item h3 { 
    font-size: 1.1em; 
    color: #00539C; 
    margin-bottom: 8px; 
    font-weight: 600; 
}

.benefit-item p { 
    font-size: 0.88em; 
    color: #666; 
    line-height: 1.4; 
}

.benefit-item:hover .icon-circle { 
    background-color: #0074D9; 
    border-color: #0074D9; 
}

.benefit-item:hover .icon-circle svg { 
    stroke: #fff; 
}

/* ===== WELCOME SECTION ===== */
.welcome-container { 
    display: flex; 
    flex-wrap: wrap; 
    align-items: center; 
    gap: 40px; 
    max-width: 100%; 
    margin: 10px auto; 
    padding: 60px 20px; 
    background-color: white; 
}

.welcome-text-content { 
    flex: 1; 
    min-width: 300px; 
    max-width: 600px; 
    margin-left: auto; 
    margin-right: auto; 
    padding: 0 15px; 
}

.welcome-text-content p { 
    font-size: 1em; 
    line-height: 1.8; 
    color: #444; 
    margin-bottom: 15px; 
}

.welcome-text-content .thank-you-note { 
    font-weight: normal; 
    color: #444; 
    display: block; 
}

.welcome-image { 
    flex-shrink: 0; 
    width: 500px; 
    height: auto; 
    display: block; 
    margin-left: auto; 
    margin-right: auto; 
    padding: 0 15px; 
}

/* ===== PRODUCTS SECTION ===== */
.products-section { 
    background-image: url('image/background-xanh-1.jpg'); 
    background-size: cover; 
    background-position: center; 
    background-repeat: no-repeat; 
    padding: 60px 20px; 
    text-align: center; 
    color: #fff; 
    position: relative; 
    z-index: 1; 
}

.products-section::before { 
    content: ''; 
    position: absolute; 
    top: 0; 
    left: 0; 
    right: 0; 
    bottom: 0; 
    background-color: rgba(0, 0, 0, 0.5); 
    z-index: -1; 
}

.products-section h2 { 
    font-size: 1.8em; 
    color: #fff; 
    margin-bottom: 10px; 
    font-weight: 700; 
}

.products-section p.subtitle { 
    font-size: 1em; 
    color: #eee; 
    margin-bottom: 40px; 
}

.products-container { 
    display: flex; 
    justify-content: center; 
    flex-wrap: wrap; 
    gap: 30px; 
    max-width: 1200px; 
    margin: 0 auto; 
}

.product-item { 
    flex: 0 0 calc(33.33% - 20px); 
    max-width: 350px; 
    background: rgba(255, 255, 255, 0.9); 
    border-radius: 8px; 
    box-shadow: 0 4px 10px rgba(0,0,0,0.1); 
    overflow: hidden; 
    text-align: center; 
    transition: transform 0.3s ease; 
}

.product-item:hover { 
    transform: translateY(-5px); 
}

.product-item img { 
    width: 100%; 
    height: 200px; 
    object-fit: cover; 
    display: block; 
    border-bottom: 1px solid #eee; 
}

.product-item h3 { 
    font-size: 1.1em; 
    color: #00539C; 
    margin: 15px 0 10px; 
    padding: 0 10px; 
    font-weight: 600; 
}

.product-item p { 
    font-size: 0.9em; 
    color: #666; 
    padding: 0 15px 15px; 
    line-height: 1.5; 
}

/* ===== COMMITMENTS SECTION ===== */
.commitments-section { 
    background-color: #f8f9fa; 
    padding: 60px 20px; 
    text-align: center; 
}

.commitments-section h2 { 
    font-size: 1.8em; 
    color: #00539C; 
    margin-bottom: 5px; 
    font-weight: 700; 
}

.commitments-section p.subtitle { 
    font-size: 1em; 
    color: #555; 
    margin-bottom: 30px; 
}

.commitments-container { 
    display: flex; 
    justify-content: center; 
    flex-wrap: wrap; 
    gap: 30px; 
    max-width: 1200px; 
    margin: 0 auto; 
}

.commitment-item { 
    flex: 0 0 calc(25% - 22.5px); 
    max-width: 280px; 
    text-align: center; 
}

.commitment-item .icon-circle { 
    width: 100px; 
    height: 100px; 
    border: 2px solid #0074D9; 
    border-radius: 50%; 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    margin: 0 auto 15px auto; 
    transition: all 0.3s ease; 
}

.commitment-item .icon-circle svg { 
    width: 50px; 
    height: 50px; 
    stroke: #0074D9; 
    stroke-width: 1.5; 
    fill: none; 
}

.commitment-item h3 { 
    font-size: 1.1em; 
    color: #00539C; 
    margin-bottom: 8px; 
    font-weight: 600; 
}

.commitment-item p { 
    font-size: 0.88em; 
    color: #666; 
    line-height: 1.4; 
}

.commitment-item:hover .icon-circle { 
    background-color: #0074D9; 
    border-color: #0074D9; 
}

.commitment-item:hover .icon-circle svg { 
    stroke: #fff; 
}

/* ===== PROJECTS SECTION ===== */
.projects-section { 
    background-color: white; 
    padding: 60px 20px; 
    text-align: center; 
}

.projects-section h2 { 
    font-size: 1.8em; 
    color: #00539C; 
    margin-bottom: 10px; 
    font-weight: 700; 
}

.projects-section p.subtitle { 
    font-size: 1em; 
    color: #555; 
    /* margin-bottom: 40px;  */
}

.projects-carousel-container { 
    position: relative; 
    max-width: 1200px; 
    margin: 0 auto; 
    overflow: hidden; 
}

.projects-carousel { 
    display: flex; 
    align-items: center; 
    transition: transform 0.5s ease-in-out; 
    gap: 30px; 
    padding: 0 10px; 
}

.project-item { 
    flex: 0 0 calc(33.33% - 20px); 
    min-width: 300px; 
    max-width: 350px; 
    background: white; 
    border-radius: 8px; 
    box-shadow: 0 4px 10px rgba(0,0,0,0.1); 
    overflow: hidden; 
    text-align: center; 
    transition: transform 0.3s ease; 
}

.project-item:hover { 
    transform: translateY(-5px); 
}

.project-item img { 
    width: 100%; 
    height: 200px; 
    object-fit: cover; 
    display: block; 
    border-bottom: 1px solid #eee; 
}

.project-item h3 { 
    font-size: 0.9em; 
    color: #00539C; 
    margin: 15px 0 10px; 
    padding: 0 10px; 
    font-weight: 600; 
}

.carousel-button { 
    position: absolute; 
    top: 50%; 
    transform: translateY(-50%); 
    background-color: transparent; 
    color: #666; 
    border: none; 
    padding: 5px 8px; 
    cursor: pointer; 
    font-size: 1.8em; 
    z-index: 5; 
    border-radius: 5px; 
    transition: color 0.3s ease; 
}

.carousel-button:hover { 
    color: #333; 
}

.carousel-button.left { 
    left: 0; 
}

.carousel-button.right { 
    right: 0; 
}

/* ===== PARTNERS SECTION ===== */
.partners-section { 
    padding: 60px 20px; 
    text-align: center; 
    background-color: white; 
}

.partners-section h2 { 
    font-size: 1.8em; 
    color: #00539C; 
    /* margin-bottom: 40px;  */
    font-weight: 700; 
}

.partners-grid { 
    display: grid; 
    grid-template-columns: repeat(5, 1fr); 
    gap: 30px; 
    max-width: 1200px; 
    margin: 0 auto; 
    align-items: center; 
    justify-items: center; 
}

.partner-logo { 
    flex: none; 
    width: 200px; 
    height: 150px; 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    padding: 0; 
    box-shadow: none; 
    border-radius: 0; 
    background-color: transparent; 
    transition: transform 0.3s ease; 
}

.partner-logo:hover { 
    transform: translateY(-3px); 
}

.partner-logo img { 
    max-width: 100%; 
    max-height: 100%; 
    display: block; 
    object-fit: contain; 
    filter: grayscale(0%); 
}

/* ===== FOOTER STYLES ===== */
footer { 
    text-align: center; 
    padding: 0; 
    background: #00539C; 
    color: white; 
    display: flex; 
    flex-direction: column; 
    justify-content: center; 
    align-items: center; 
}

.contact-info { 
    max-width: 1200px; 
    margin: 0 auto 8px auto; 
    padding: 40px 20px; 
    background-color: #00539C; 
    color: white; 
    text-align: left; 
}

.contact-info .main-heading { 
    font-size: 1.6em; 
    font-weight: 700; 
    margin-bottom: 30px; 
    line-height: 1.2; 
    text-align: center; 
}

.contact-columns-wrapper { 
    display: flex; 
    justify-content: space-between; 
    flex-wrap: wrap; 
    gap: 20px; 
}

.contact-column { 
    flex: 1; 
    min-width: 280px; 
    padding: 0 15px; 
    text-align: left; 
}

.contact-column p { 
    font-size: 0.9em; 
    margin: 8px 0; 
    line-height: 1.35; 
    color: #eee; 
}

.copyright-text { 
    font-size: 0.9em; 
    margin-top: -30px; 
    text-align: center; 
    padding: 15px 20px; 
    background-color: #00539C; 
    color: white; 
    width: 100%; 
}

/* ===== PAGE SPECIFIC STYLES ===== */

/* Page Title */
.page-title { 
    background-color: #e0f2f7; 
    padding: 60px 20px; 
    text-align: center; 
    color: #00539c; 
    font-weight: 700; 
    font-size: 2em; 
    margin-bottom: 30px; 
}

.page-header { 
    background-image: url('https://png.pngtree.com/background/20210711/original/pngtree-blue-fresh-light-effect-medical-symbol-molecular-chain-medical-poster-picture-image_1066161.jpg'); 
    background-size: cover; 
    background-position: top; 
    padding: 120px 50px; 
    text-align: center; 
    color: #fff; 
    font-size: 2.5em; 
    font-weight: 700; 
    margin-bottom: 20px; 
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5); 
}

/* Main Content */
.main-content { 
    max-width: 1200px; 
    margin: 0 auto; 
    padding: 20px; 
    line-height: 1.8; 
    font-size: 1.05em; 
}

.main-content h1 { 
    color: #00539c; 
    font-size: 1.8em; 
    margin-bottom: 15px; 
    font-weight: 700; 
}

.main-content h2 { 
    color: #00539c; 
    font-size: 1.5em; 
    margin-bottom: 15px; 
    font-weight: 600; 
}

.main-content p { 
    margin-bottom: 15px; 
    color: #333; 
}

.main-content ul { 
    list-style: none; 
    padding-left: 0; 
    margin-bottom: 15px; 
}

.main-content ul li { 
    position: relative; 
    padding-left: 20px; 
    margin-bottom: 8px; 
}

.main-content ul li::before { 
    content: "•"; 
    color: #00539c; 
    position: absolute; 
    left: 0; 
}

/* Products Page Styles */
.main-content-products { 
    display: flex; 
    max-width: 1200px; 
    margin: 0 auto; 
    padding: 20px 0; 
    gap: 20px; 
}

.sidebar { 
    width: 280px; 
    flex-shrink: 0; 
    background-color: #fff; 
    border-radius: 8px; 
    box-shadow: 0 4px 8px rgba(0,0,0,0.1); 
    padding-bottom: 20px; 
    height: fit-content; 
    position: sticky; 
    top: 20px; 
}

.sidebar-heading { 
    background-color: #00539c; 
    color: #fff; 
    padding: 12px 20px; 
    font-size: 1.1em; 
    font-weight: 600; 
    border-top-left-radius: 8px; 
    border-top-right-radius: 8px; 
}

.sidebar-menu ul { 
    list-style: none; 
    padding: 0; 
    margin: 0; 
}

.sidebar-menu li { 
    list-style: none; 
}

.sidebar-menu li::before { 
    content: none; 
}

.sidebar-menu li::marker { 
    content: none; 
}

.sidebar-menu li a { 
    display: block; 
    padding: 10px 20px; 
    color: #333; 
    text-decoration: none; 
    font-size: 0.95em; 
    transition: background-color 0.3s ease, color 0.3s ease; 
    border-bottom: 1px solid #eee; 
}

.sidebar-menu li:last-child a { 
    border-bottom: none; 
}

.sidebar-menu li a:hover { 
    background-color: #e9ecef; 
    color: #0074D9; 
}

.product-content { 
    flex-grow: 1; 
    padding: 20px; 
    background-color: #fff; 
    border-radius: 8px; 
    box-shadow: 0 4px 8px rgba(0,0,0,0.1); 
}

.product-category-section { 
    margin-bottom: 40px; 
}

.product-category-section h2 { 
    font-size: 1.8em; 
    color: #00539c; 
    margin-bottom: 15px; 
    padding-bottom: 8px; 
    border-bottom: 2px solid #0074D9; 
}

.products-grid { 
    display: grid; 
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); 
    gap: 20px; 
    padding: 0; 
}

.product-card { 
    background-color: #fff; 
    border: 1px solid #ddd; 
    border-radius: 8px; 
    overflow: hidden; 
    box-shadow: 0 4px 8px rgba(0,0,0,0.1); 
    transition: transform 0.2s ease-in-out; 
    display: flex; 
    flex-direction: column; 
}

.product-card:hover { 
    transform: translateY(-5px); 
}
.partner-card:hover { 
    transform: translateY(-3px); 
}
.product-card img { 
    width: 100%; 
    height: 180px; 
    object-fit: contain; 
    display: block; 
}

.product-card-content { 
    padding: 15px; 
    display: flex; 
    flex-direction: column; 
}

.product-card-content h3 { 
    color: #00539c; 
    font-size: 1.3em; 
    margin-bottom: 0; 
}

/* Contact Page Styles */
.main-contact-content { 
    display: flex; 
    justify-content: space-between; 
    gap: 40px; 
    max-width: 1000px; 
    margin: 40px auto; 
    padding: 20px; 
    background-color: #ffffff; 
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1); 
    border-radius: 8px; 
}

.about-us-section { 
    flex: 1; 
    padding: 20px; 
}

.about-us-section h3, 
.contact-form-container h3 { 
    color: #000; 
    font-size: 20px; 
    margin-bottom: 25px; 
    padding-bottom: 10px; 
    border-bottom: 1px solid #eee; 
    font-weight: 600; 
}

.about-us-section ul { 
    list-style: none; 
    padding-left: 0; 
}

.about-us-section ul li { 
    margin-bottom: 15px; 
    font-size: 16px; 
    color: #555; 
    line-height: 1.5; 
}

.contact-form-container { 
    flex: 1; 
    padding: 20px; 
}

.form-group { 
    margin-bottom: 15px; 
}

.form-group label { 
    display: block; 
    margin-bottom: 8px; 
    color: #555; 
    font-weight: 400; 
    font-size: 14px; 
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group textarea { 
    width: 100%; 
    padding: 10px; 
    border: 1px solid #ccc; 
    border-radius: 4px; 
    font-size: 14px; 
    box-sizing: border-box; 
}

.form-group input[type="text"]:focus,
.form-group input[type="email"]:focus,
.form-group textarea:focus { 
    border-color: #007bff; 
    outline: none; 
    box-shadow: 0 0 5px rgba(0, 123, 255, 0.25); 
}

.form-group textarea { 
    resize: vertical; 
    min-height: 100px; 
}

.form-submit-button { 
    background-color: #007bff; 
    color: white; 
    padding: 10px 20px; 
    border: none; 
    border-radius: 4px; 
    cursor: pointer; 
    font-size: 16px; 
    font-weight: 600; 
    width: 100px; 
    margin: 25px 0 0 auto; 
    display: block; 
    transition: background-color 0.3s ease; 
}

.form-submit-button:hover { 
    background-color: #0056b3; 
}

/* ===== RESPONSIVE DESIGN ===== */

/* Desktop Styles - Hide mobile header */
@media (min-width: 993px) {
    .mobile-header {
        display: none;
    }
    
    .desktop-header {
        display: block;
    }
    
    .main-nav {
        display: block;
    }
    
    body {
        padding-top: 0;
    }
}

/* Tablet Styles */
@media (max-width: 992px) {
    /* Show mobile header on tablet */
    .mobile-header {
        display: flex;
    }
    
    .desktop-header {
        display: none;
    }
    
    .main-nav {
        display: none;
    }
    
    /* Add top padding to body to account for fixed mobile header */
    body {
        padding-top: 70px;
    }
    
    .benefit-item { 
        flex: 0 0 calc(50% - 20px); 
    }
    
    .commitment-item { 
        flex: 0 0 calc(50% - 20px); 
    }
    
    .product-item { 
        flex: 0 0 calc(50% - 20px); 
    }
    
    .project-item { 
        flex: 0 0 calc(50% - 20px); 
    }
    
    .welcome-container { 
        flex-direction: column; 
        text-align: center; 
    }
    
    .welcome-image { 
        width: 80%; 
        margin: 20px auto; 
    }
    
    .welcome-text-content { 
        max-width: 80%; 
    }
    
    .main-content-products { 
        flex-direction: column; 
        padding: 10px; 
    }
    
    .sidebar { 
        width: 100%; 
        position: static; 
    }
    
    .product-content { 
        padding: 10px; 
    }
    
    .main-contact-content { 
        flex-direction: column; 
        gap: 20px; 
    }
}

/* Mobile Styles */
@media (max-width: 768px) {
    /* Show mobile header, hide desktop header */
    .mobile-header {
        display: flex;
    }
    
    .desktop-header {
        display: none;
    }
    
    .main-nav {
        display: none;
    }
    
    /* Add top padding to body to account for fixed mobile header */
    body {
        padding-top: 70px;
    }
    
    /* Mobile header responsive adjustments */
    .mobile-header {
        padding: 1.3em;
    }
    
    .logo-container {
        gap: 8px;
    }
    
    .logo-icon {
        width: 35px;
        height: 35px;
    }
    
    .logo-icon svg {
        width: 20px;
        height: 20px;
    }
    
    .logo-text {
        font-size: 16px;
    }
    
    .header-actions {
        gap: 10px;
    }
    
    .action-btn {
        padding: 6px;
    }
    
    .action-btn svg {
        width: 20px;
        height: 20px;
    }
    
    .hamburger-menu span {
        width: 22px;
        height: 2px;
    }
    
    .hero { 
        height: 300px; 
    }
    
    .hero-text { 
        margin-left: 20px; 
        margin-top: -50px; 
    }
    
    .hero h1 { 
        font-size: 2em; 
    }
    
    .hero h1 .big-text { 
        font-size: 1.3em; 
    }
    
    .benefit-item { 
        flex: 0 0 calc(100% - 20px); 
        max-width: 350px; 
    }
    
    .commitment-item { 
        flex: 0 0 calc(100% - 20px); 
        max-width: 350px; 
    }
    
    .product-item { 
        flex: 0 0 calc(100% - 20px); 
        max-width: 400px; 
    }
    
    .project-item { 
        flex: 0 0 calc(100% - 20px); 
        max-width: 400px; 
    }
    
    .partners-grid { 
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); 
    }
    
    .partner-logo { 
        width: 150px; 
        height: 80px; 
    }
    
    .welcome-image { 
        width: 95%; 
    }
    
    .welcome-text-content { 
        max-width: 95%; 
    }
    
    .contact-columns-wrapper { 
        flex-direction: column; 
        align-items: center; 
        gap: 20px; 
    }
    
    .contact-column { 
        width: 100%; 
        max-width: 400px; 
        padding: 0; 
        text-align: center; 
    }
    
    .contact-column p { 
        text-align: center; 
    }
    
    .products-grid { 
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); 
        gap: 15px; 
    }
    
    .product-card img { 
        height: 150px; 
    }
    
    .page-header { 
        padding: 80px 20px; 
        font-size: 2em; 
    }
    
    .main-content { 
        padding: 10px; 
    }
    
    .main-content h1 { 
        font-size: 1.5em; 
    }
    
    .main-content h2 { 
        font-size: 1.3em; 
    }
}

/* Small Mobile Styles */
@media (max-width: 480px) {
    .hero h1 { 
        font-size: 1.5em; 
    }
    
    .hero h1 .big-text { 
        font-size: 1.1em; 
    }
    
    .section { 
        padding: 40px 10px; 
    }
    
    .why-choose-section, 
    .commitments-section, 
    .products-section, 
    .projects-section, 
    .partners-section { 
        padding: 40px 10px; 
    }
    
    .benefit-item .icon-circle, 
    .commitment-item .icon-circle { 
        width: 80px; 
        height: 80px; 
    }
    
    .benefit-item .icon-circle svg, 
    .commitment-item .icon-circle svg { 
        width: 40px; 
        height: 40px; 
    }
    
    .main-contact-content { 
        margin: 20px auto; 
        padding: 15px; 
    }
    
    .about-us-section, 
    .contact-form-container { 
        padding: 15px; 
    }
}

/* Projects Section Carousel */
.projects-section {
  padding: 60px 20px;
  text-align: center;
}

.projects-section .swiper {
  padding: 30px 10px;
}

.projects-section .swiper-slide, .partners-section .swiper-slide {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  overflow: hidden;
  text-align: center;
  transition: transform 0.3s ease;  
}

.projects-section .swiper-slide:hover {
  transform: translateY(-5px);
}

.partners-section .swiper-slide:hover {
  transform: translateY(-5px);
}

.projects-section .swiper-slide img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.projects-section .swiper-slide h3 {
  margin: 12px 0;
  font-size: 1.1rem;
  color: #333;
}

.projects-section .swiper-button-next,
.projects-section .swiper-button-prev {
  color: #fff; /* màu icon */
  transition: color 0.3s ease, transform 0.3s ease;
  background: rgba(0, 0, 0, 0.3); /* nền trong suốt đen mờ */
  border-radius: 50%;
  padding: 1.5em;
}

.projects-section .swiper-button-next::after,
.projects-section .swiper-button-prev::after {
  font-size: 18px; /* chỉnh icon nhỏ gọn */
}

.projects-section .swiper-button-next:hover,
.projects-section .swiper-button-prev:hover {
  background: rgba(0, 0, 0, 0.6); /* hover đậm hơn */
  transform: scale(1.1);
}

/* CSS cho Swiper component trong partners */
.partners-section {
  padding: 60px 20px;
  text-align: center;
}

.partners-section .swiper {
  padding: 30px 10px;
  max-width: 1200px; /* ví dụ */
  margin: 0 auto;
}

.partners-section .swiper-slide {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  overflow: hidden;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 180px;
}

.partners-section .swiper-slide img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

/* Nút điều hướng giống với project-section */
.partners-section .swiper-button-next,
.partners-section .swiper-button-prev {
  color: #333;
  transition: color 0.3s ease;
  padding: 1.5em;
  background: rgb(197 182 182 / 37%);
  border-radius: 50%;
}

.partners-section .swiper-button-next:after,
.partners-section .swiper-button-prev:after {
  font-size: 20px !important;
}

.partners-section .swiper-button-next:hover,
.partners-section .swiper-button-prev:hover {
  color: #fff;
  background: rgba(0,0,0,0.5);
}

.partners-section .swiper-button-next {
  transform: translateX(-10px);
}
.partners-section .swiper-button-prev {
  transform: translateX(10px);
}

@media (min-width: 1024px) {
  .projects-section .swiper-button-next,
  .projects-section .swiper-button-prev,
  .partners-section .swiper-button-next,
  .partners-section .swiper-button-prev {
    display: none !important;
  }
}

#backToTop {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: #007bff; /* màu nền */
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
  transition: all 0.3s ease;
  opacity: 0;
  visibility: hidden;
  z-index: 9999;
}

#backToTop:hover {
  background: #0056b3; /* màu hover */
  transform: translateY(-3px);
}

#backToTop.show {
  opacity: 1;
  visibility: visible;
}