:root {
    --primary-color: #0D6EFD;
    --secondary-color: #0DCAF0;
    --dark-color: #212529;
    --light-color: #f8f9fa;
    --text-color: #343A40;
    --grey-text: #6c757d;
    --border-color: #dee2e6;
    --font-family-main: 'Be Vietnam Pro', sans-serif;
    --gradient-1: linear-gradient(135deg, #0D6EFD 0%, #0DCAF0 100%);
    --gradient-2: linear-gradient(135deg, #6f42c1 0%, #d63384 100%);
    --gradient-text: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.075);
    --shadow-md: 0 4px 8px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 20px rgba(0,0,0,0.15);
    --border-radius-sm: 0.25rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.75rem;
    --transition-speed: 0.3s;
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html {
    scroll-behavior: smooth;
}
body {
    font-family: var(--font-family-main);
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--light-color);
    font-size: 16px;
    overflow-x: hidden;
}
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}
img {
    max-width: 100%;
    height: auto;
    display: block;
}
a {
    text-decoration: none;
    color: var(--primary-color);
    transition: color var(--transition-speed) ease;
}
a:hover {
    color: var(--secondary-color);
}
.main-heading-style {
    font-size: clamp(2.5rem, 5vw, 3.8rem);
    font-weight: 800;
    margin-bottom: 0.75em;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-fill-color: transparent;
    line-height: 1.2;
}
.secondary-heading-style {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 1em;
    text-align: center;
    position: relative;
    padding-bottom: 0.5em;
}
.secondary-heading-style::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--gradient-1);
    border-radius: 2px;
}
.tertiary-heading-style {
    font-size: clamp(1.3rem, 2.5vw, 1.8rem);
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5em;
}
.section-intro {
    font-size: 1.1rem;
    color: var(--grey-text);
    max-width: 800px;
    margin: 0 auto 2.5rem auto;
    text-align: center;
    line-height: 1.8;
}
section {
    padding: 80px 0;
    overflow: hidden; 
}
.section-gradient-1 {
    background: linear-gradient(135deg, rgba(13, 110, 253, 0.05) 0%, rgba(13, 202, 240, 0.05) 100%);
}
.section-gradient-2 {
    background: linear-gradient(135deg, rgba(111, 66, 193, 0.05) 0%, rgba(214, 51, 132, 0.05) 100%);
}
.section-style-1 {
    background-color: #ffffff;
}
.section-style-2 {
    background-color: var(--light-color);
}
.site-header {
    background-color: #fff;
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
    transition: padding var(--transition-speed) ease;
}
.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo-link .logo-img {
    height: 50px; 
    width: auto;
    transition: transform var(--transition-speed) ease;
}
.logo-link .logo-img:hover {
    transform: scale(1.05);
}
.main-navigation .menu-list {
    list-style: none;
    display: flex;
    align-items: center;
}
.main-navigation .menu-item {
    margin: 0 15px;
    font-weight: 500;
    color: var(--text-color);
    position: relative;
    padding: 10px 0;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.main-navigation .menu-item::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width var(--transition-speed) ease;
}
.main-navigation .menu-item:hover::after,
.main-navigation .menu-item.active::after {
    width: 100%;
}
.main-navigation .menu-item:hover,
.main-navigation .menu-item.active {
    color: var(--primary-color);
}
.menu-item-has-children {
    position: relative;
}
.sub-menu {
    list-style: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: #fff;
    box-shadow: var(--shadow-md);
    border-radius: 0 0 var(--border-radius-md) var(--border-radius-md);
    padding: 10px 0;
    min-width: 220px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity var(--transition-speed) ease, transform var(--transition-speed) ease, visibility var(--transition-speed) ease;
}
.menu-item-has-children:hover .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.sub-menu-item {
    display: block;
    padding: 10px 20px;
    color: var(--text-color);
    font-size: 0.9rem;
    transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
}
.sub-menu-item:hover {
    background-color: var(--primary-color);
    color: #fff;
}
.cta-button {
    background: var(--gradient-1);
    color: #fff;
    padding: 12px 25px;
    border-radius: var(--border-radius-lg);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    border: none;
    cursor: pointer;
    transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
    font-size: 0.9rem;
    box-shadow: var(--shadow-sm);
}
.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    color: #fff;
}
.hero-section {
    padding: 100px 0;
    text-align: center;
    min-height: 80vh;
    display: flex;
    align-items: center;
    position: relative;
}
.hero-section::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image: url('dsn.vn-1.png'); 
    background-size: cover;
    background-position: center;
    opacity: 0.05;
    z-index: -1;
}
.hero-section .container {
    position: relative;
    z-index: 1;
}
.hero-title {
    margin-bottom: 20px;
}
.partnership-notice {
    font-size: 0.95rem;
    color: var(--grey-text);
    margin-bottom: 30px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    background: rgba(255,255,255,0.8);
    padding: 15px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
}
.partnership-notice .email-link {
    font-weight: 700;
}
.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 40px;
    margin-bottom: 40px;
}
.hero-text p {
    font-size: 1.15rem;
    color: var(--text-color);
    margin-bottom: 20px;
    max-width: 800px;
    line-height: 1.8;
}
.hero-image-cluster {
    display: flex;
    justify-content: center;
    align-items: flex-end; 
    gap: 20px;
    max-width: 800px; 
    margin: 0 auto;
}
.hero-image-cluster .hero-img {
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    object-fit: cover;
    transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}
.hero-image-cluster .hero-img:hover {
    transform: scale(1.03) translateY(-5px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.2);
}
.hero-image-cluster .hero-img:first-child { 
    width: 60%; 
    max-height: 400px;
}
.hero-image-cluster .small-img { 
    width: 35%; 
    max-height: 250px;
    align-self: center; 
}
.cta-button-secondary {
    background-color: transparent;
    color: var(--primary-color);
    padding: 12px 25px;
    border-radius: var(--border-radius-lg);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    border: 2px solid var(--primary-color);
    cursor: pointer;
    transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease, transform var(--transition-speed) ease;
    font-size: 0.9rem;
}
.cta-button-secondary:hover {
    background-color: var(--primary-color);
    color: #fff;
    transform: translateY(-2px);
}
.solutions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}
.solution-item {
    background-color: #fff;
    padding: 30px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    text-align: left;
    transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
    display: flex;
    flex-direction: column;
}
.solution-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}
.solution-item .solution-icon,
.solution-item .solution-icon-secondary {
    height: 60px; 
    width: auto;
    margin-bottom: 20px;
    object-fit: contain; 
}
.solution-item .solution-icon-secondary {
    height: 45px;
    opacity: 0.7;
    margin-top: -10px;
}
.solution-item p {
    font-size: 0.95rem;
    color: var(--grey-text);
    flex-grow: 1; 
    line-height: 1.8;
}
.image-gallery-solutions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}
.image-gallery-solutions img {
    width: 100%;
    height: 200px; 
    object-fit: cover;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease, filter 0.3s ease;
}
.image-gallery-solutions img:hover {
    transform: scale(1.05);
    filter: brightness(1.1);
}
.advisory-content-wrapper {
    display: flex;
    gap: 40px;
    align-items: center;
}
.advisory-image-showcase {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 15px;
}
.advisory-main-img {
    width: 100%;
    max-height: 450px;
    object-fit: cover;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
}
.advisory-sub-images {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}
.advisory-sub-images img {
    width: 100%;
    height: 120px;
    object-fit: cover;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    filter: grayscale(50%);
    transition: filter var(--transition-speed) ease;
}
.advisory-sub-images img:hover {
    filter: grayscale(0%);
}
.advisory-text-content {
    flex: 1.2;
    text-align: left;
}
.advisory-text-content p {
    margin-bottom: 20px;
    line-height: 1.9;
}
.advisory-benefits {
    list-style: none;
    padding-left: 0;
}
.advisory-benefits li {
    margin-bottom: 15px;
    font-size: 1.05rem;
    display: flex;
    align-items: center;
    color: var(--text-color);
}
.advisory-benefits img {
    width: 24px; 
    height: 24px;
    margin-right: 15px;
    object-fit: contain;
}
.partners-showcase {
    display: flex;
    flex-direction: column;
    gap: 30px;
}
.partner-logo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 25px;
    align-items: center;
    padding: 20px;
    background: #fff;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
}
.partner-logo-grid img {
    max-height: 60px; 
    width: auto;
    margin: 0 auto;
    filter: grayscale(100%);
    opacity: 0.7;
    transition: filter var(--transition-speed) ease, opacity var(--transition-speed) ease;
}
.partner-logo-grid img:hover {
    filter: grayscale(0%);
    opacity: 1;
}
.partner-content {
    text-align: left;
    display: flex;
    gap: 30px;
    align-items: flex-start;
}
.partner-content p {
    flex: 1.5;
    font-size: 1.05rem;
    line-height: 1.9;
}
.partner-main-visual {
    flex: 1;
    max-height: 300px; 
    object-fit: cover;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
}
.partner-main-visual.small-visual {
    max-height: 140px; 
}
.knowledge-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}
.knowledge-card {
    background: #fff;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}
.knowledge-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}
.knowledge-card-img {
    width: 100%;
    height: 220px; 
    object-fit: cover;
}
.knowledge-card-img-secondary {
    width: 80%;
    height: 150px;
    object-fit: cover;
    margin: -50px auto 20px auto;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-md);
    position: relative;
    z-index: 1;
}
.knowledge-card-content {
    padding: 25px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    text-align: left;
}
.knowledge-card-title {
    margin-bottom: 15px;
    line-height: 1.4;
}
.knowledge-card p {
    font-size: 0.9rem;
    color: var(--grey-text);
    margin-bottom: 20px;
    flex-grow: 1;
    line-height: 1.7;
}
.read-more-link {
    font-weight: 700;
    color: var(--primary-color);
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
    align-self: flex-start;
    padding: 8px 0;
}
.read-more-link:hover {
    text-decoration: underline;
}
.additional-knowledge-images {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 15px;
}
.additional-knowledge-images img {
    width: 100%;
    height: 150px;
    object-fit: cover;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    opacity: 0.8;
    transition: opacity var(--transition-speed) ease, transform var(--transition-speed) ease;
}
.additional-knowledge-images img:hover {
    opacity: 1;
    transform: scale(1.03);
}
.about-us-content {
    display: flex;
    gap: 40px;
    align-items: center;
}
.about-us-text {
    flex: 1.5;
    text-align: left;
}
.about-us-text p {
    margin-bottom: 20px;
    font-size: 1.05rem;
    line-height: 1.9;
}
.about-us-images {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr;
    gap: 15px;
}
.about-img-main {
    width: 100%;
    max-height: 400px; 
    object-fit: cover;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
}
.about-img-secondary {
    width: 100%;
    height: 180px; 
    object-fit: cover;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
}
.contact-wrapper {
    display: flex;
    gap: 40px;
    background: #fff;
    padding: 40px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    text-align: left;
}
.contact-details {
    flex: 1;
}
.contact-details p {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    font-size: 1rem;
}
.contact-icon {
    width: 20px; 
    height: 20px;
    margin-right: 12px;
    object-fit: contain;
    filter: opacity(0.7);
}
.contact-map-image {
    width: 100%;
    max-height: 250px; 
    object-fit: cover;
    border-radius: var(--border-radius-md);
    margin-top: 20px;
}
.contact-form-main {
    flex: 1.5;
}
.form-group {
    margin-bottom: 20px;
}
.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 8px;
    font-size: 0.9rem;
    color: var(--text-color);
}
.form-group input[type="text"],
.form-group input[type="email"],
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    font-size: 1rem;
    font-family: var(--font-family-main);
    transition: border-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}
.form-group input[type="text"]:focus,
.form-group input[type="email"]:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}
.form-group textarea {
    resize: vertical;
    min-height: 120px;
}
.contact-form-main .cta-button {
    width: 100%;
    padding: 15px;
    font-size: 1rem;
}
.sponsored-partners-section {
    background-color: var(--light-color);
}
.partner-list {
    text-align: left;
}
.partner-item {
    margin-bottom: 15px;
    font-size: 1.05rem;
    color: var(--text-color);
    line-height: 1.8;
}
.sponsored-link {
    font-weight: 700;
    text-decoration: underline;
    transition: opacity var(--transition-speed) ease;
}
.sponsored-link:hover {
    opacity: 0.8;
}
.skincare-link { color: #e83e8c; }
.honey-link { color: #fd7e14; }
.delivery-link { color: #20c997; }
.tui-link { color: #6f42c1; }
.ecom-link { color: #17a2b8; }
.site-footer {
    background-color: var(--dark-color);
    color: rgba(255,255,255,0.8);
    padding: 60px 0 20px 0;
    text-align: left;
}
.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}
.footer-heading {
    font-size: 1.2rem;
    color: #fff;
    margin-bottom: 20px;
    font-weight: 700;
    position: relative;
    padding-bottom: 10px;
}
.footer-heading::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background: var(--primary-color);
}
.footer-column p {
    font-size: 0.95rem;
    line-height: 1.8;
    margin-bottom: 15px;
}
.footer-logo {
    max-height: 40px; 
    width: auto;
    opacity: 0.8;
    margin-top: 10px;
}
.footer-links {
    list-style: none;
}
.footer-links li a {
    color: rgba(255,255,255,0.7);
    display: block;
    padding: 8px 0;
    font-size: 0.95rem;
    transition: color var(--transition-speed) ease, padding-left var(--transition-speed) ease;
}
.footer-links li a:hover {
    color: #fff;
    padding-left: 5px;
}
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 20px;
    text-align: center;
    font-size: 0.9rem;
}
.footer-bottom p {
    margin-bottom: 5px;
}
.credits-link {
    color: var(--secondary-color);
    font-weight: 500;
}
.credits-link:hover {
    text-decoration: underline;
    color: #fff;
}
@media (max-width: 992px) {
    .header-container {
        flex-direction: column;
        align-items: flex-start;
    }
    .main-navigation {
        width: 100%;
        margin-top: 15px;
    }
    .main-navigation .menu-list {
        flex-direction: column;
        align-items: flex-start;
    }
    .main-navigation .menu-item {
        margin: 5px 0;
        width: 100%;
    }
    .sub-menu {
        position: static;
        box-shadow: none;
        padding-left: 20px;
        opacity: 1;
        visibility: visible;
        transform: none;
        background-color: transparent;
        min-width: auto;
        padding-top: 5px;
        padding-bottom: 5px;
    }
    .menu-item-has-children:hover .sub-menu {
    }
    .sub-menu-item {
        color: var(--grey-text);
    }
    .sub-menu-item:hover {
        background-color: transparent;
        color: var(--primary-color);
    }
    .cta-button {
        margin-top: 15px;
        align-self: flex-start;
    }
    .hero-content, .advisory-content-wrapper, .partner-content, .about-us-content, .contact-wrapper {
        flex-direction: column;
    }
    .hero-image-cluster {
        flex-direction: column;
        align-items: center;
    }
    .hero-image-cluster .hero-img, .hero-image-cluster .small-img {
        width: 80%;
        max-width: 400px;
    }
}
@media (max-width: 768px) {
    .main-heading-style {
        font-size: 2.2rem;
    }
    .secondary-heading-style {
        font-size: 1.8rem;
    }
    .tertiary-heading-style {
        font-size: 1.2rem;
    }
    section {
        padding: 60px 0;
    }
    .solutions-grid, .knowledge-grid, .additional-knowledge-images, .image-gallery-solutions {
        grid-template-columns: 1fr;
    }
    .contact-wrapper {
        padding: 25px;
    }
}
.section-fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.section-fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}