*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
html {
    scroll-behavior: smooth;
    font-size: 16px; 
}
body {
    font-family: 'Roboto', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.7;
    color: #333;
    background-color: #f8f9fa;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
.container {
    width: 90%;
    max-width: 1280px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 15px;
    padding-right: 15px;
}
h1, h2, h3, h4, h5, h6 {
    font-family: 'Montserrat', sans-serif;
    color: #0D2A4B; 
    line-height: 1.3;
    margin-bottom: 0.75em;
    font-weight: 700;
}
.main-heading-h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    color: #FFFFFF;
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.3);
    margin-bottom: 0.5em;
}
.section-title-h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    text-align: center;
    margin-bottom: 1.5em;
    position: relative;
    padding-bottom: 0.5em;
}
.section-title-h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, #46C7F4, #0D2A4B); 
    border-radius: 2px;
}
h3.solution-name,
h3.platform-feature-title,
h3.benefit-title,
h3.offering-title {
    font-size: clamp(1.3rem, 2.5vw, 1.75rem);
    color: #1A4A7F; 
    margin-bottom: 0.5em;
}
p {
    margin-bottom: 1.25em;
    color: #555;
    font-size: clamp(0.95rem, 1.5vw, 1.1rem);
}
.intro-text,
.section-intro {
    font-size: clamp(1rem, 1.8vw, 1.2rem);
    line-height: 1.8;
    color: #4A4A4A;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}
a {
    color: #1A4A7F; 
    text-decoration: none;
    transition: color 0.3s ease, opacity 0.3s ease;
}
a:hover, a:focus {
    color: #46C7F4; 
    text-decoration: underline;
    opacity: 0.8;
}
.email-link, .phone-link {
    font-weight: 600;
}
.site-header {
    background-color: #FFFFFF;
    padding: 15px 0;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}
.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 90%;
    max-width: 1320px;
    margin: 0 auto;
}
.logo-area .site-logo {
    height: 50px; 
    width: auto;
    max-width: 180px; 
    transition: transform 0.3s ease;
}
.logo-area .site-logo:hover {
    transform: scale(1.05);
}
.main-navigation ul {
    list-style: none;
    display: flex;
    align-items: center;
}
.main-navigation ul li {
    margin-left: 25px;
    position: relative;
}
.main-navigation ul li a {
    font-family: 'Montserrat', sans-serif;
    font-weight: 600;
    font-size: 0.95rem;
    color: #0D2A4B;
    text-decoration: none;
    padding: 10px 5px;
    position: relative;
    transition: color 0.3s ease;
}
.main-navigation ul li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: #46C7F4;
    transition: width 0.3s ease;
}
.main-navigation ul li a:hover,
.main-navigation ul li a:focus,
.main-navigation ul li.active a {
    color: #46C7F4;
}
.main-navigation ul li a:hover::after,
.main-navigation ul li a:focus::after,
.main-navigation ul li.active a::after {
    width: 100%;
}
.has-submenu > a::after {
    content: ' ▾'; 
    font-size: 0.8em;
    margin-left: 4px;
}
.submenu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: #FFFFFF;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
    padding: 10px 0;
    border-radius: 0 0 8px 8px;
    min-width: 250px;
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
}
.has-submenu:hover .submenu,
.has-submenu:focus-within .submenu {
    display: block;
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.submenu li {
    margin-left: 0;
    width: 100%;
}
.submenu li a {
    display: block;
    padding: 10px 20px;
    font-size: 0.9rem;
    color: #333;
    white-space: nowrap;
}
.submenu li a:hover,
.submenu li a:focus {
    background-color: #f0f8ff; 
    color: #0D2A4B;
}
.submenu li a::after { 
    display: none;
}
.hero-section {
    padding: clamp(40px, 10vh, 100px) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
    color: #FFFFFF;
}
.gradient-hero-bai-viet-nam {
    background: linear-gradient(135deg, #0D2A4B 0%, #1A4A7F 50%, #007bff 100%); 
}
.hero-content {
    position: relative;
    z-index: 2;
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}
.partnership-notice {
    background-color: rgba(255, 255, 255, 0.1);
    padding: 15px 20px;
    border-radius: 8px;
    margin: 20px auto 30px;
    max-width: 700px;
    font-size: 0.95rem;
    line-height: 1.6;
    color: #e0e0e0;
    border: 1px solid rgba(255, 255, 255, 0.2);
}
.partnership-notice a {
    color: #87CEFA; 
    font-weight: bold;
}
.partnership-notice a:hover {
    color: #FFFFFF;
}
.hero-section .intro-text {
    color: #e0f7fa; 
    margin-bottom: 2em;
}
.hero-images {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 2em;
    margin-bottom: 2.5em;
}
.hero-image-item {
    width: clamp(150px, 25vw, 300px);
    height: clamp(150px, 25vw, 300px);
    object-fit: cover;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    transition: transform 0.4s ease, box-shadow 0.4s ease;
    border: 3px solid rgba(255, 255, 255, 0.3);
}
.hero-image-item:hover {
    transform: translateY(-10px) scale(1.05);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
}
.cta-button {
    display: inline-block;
    background: linear-gradient(45deg, #46C7F4, #009efa); 
    color: #FFFFFF;
    padding: 15px 35px;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 50px;
    text-decoration: none;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background-position 0.5s ease;
    box-shadow: 0 5px 15px rgba(70, 199, 244, 0.4);
    background-size: 200% auto;
}
.cta-button:hover,
.cta-button:focus {
    transform: translateY(-3px) scale(1.03);
    box-shadow: 0 8px 20px rgba(70, 199, 244, 0.6);
    background-position: right center; 
    color: #FFFFFF;
    text-decoration: none;
}
.site-content section {
    padding: clamp(50px, 8vh, 80px) 0;
}
.section-container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}
.section-style-1 { 
    background-color: #FFFFFF;
}
.section-style-2 { 
    background-color: #f8f9fc;
}
.gradient-content-ai {
    background: linear-gradient(120deg, #e0f7fa 0%, #f0f8ff 100%); 
}
.solution-grid,
.platform-features-grid,
.content-ai-benefits,
.academy-offerings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 3em;
}
.solution-item,
.platform-feature-item,
.benefit-item,
.offering-item {
    background-color: #FFFFFF;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 5px 25px rgba(0, 0, 0, 0.07);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
}
.solution-item:hover,
.platform-feature-item:hover,
.benefit-item:hover,
.offering-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.1);
}
.solution-image,
.platform-feature-image,
.benefit-image,
.offering-image {
    width: 100%;
    max-height: 200px; 
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 1.5em;
    transition: filter 0.3s ease;
}
.solution-item:hover .solution-image,
.platform-feature-item:hover .platform-feature-image,
.benefit-item:hover .benefit-image,
.offering-item:hover .offering-image {
    filter: brightness(1.05) saturate(1.1);
}
.image-gallery-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin-top: 2.5em;
}
.image-gallery-section img {
    width: 100%;
    height: auto;
    max-height: 180px; 
    object-fit: cover;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, opacity 0.3s ease;
}
.image-gallery-section img:hover {
    transform: scale(1.08);
    opacity: 0.85;
    cursor: pointer; 
}
.contact-form-main {
    max-width: 700px;
    margin: 2em auto 0;
    background-color: #FFFFFF;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
}
.form-group {
    margin-bottom: 1.5em;
}
.form-label {
    display: block;
    margin-bottom: 0.5em;
    font-weight: 600;
    color: #0D2A4B;
    font-size: 0.95rem;
}
.form-input,
.form-textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ced4da;
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    background-color: #f8f9fa;
}
.form-input:focus,
.form-textarea:focus {
    border-color: #46C7F4;
    box-shadow: 0 0 0 0.2rem rgba(70, 199, 244, 0.25);
    outline: none;
    background-color: #FFFFFF;
}
.form-textarea {
    min-height: 120px;
    resize: vertical;
}
.submit-button {
    display: block;
    width: 100%;
    padding: 14px 20px;
    font-size: 1.1rem;
    font-weight: 600;
    color: #FFFFFF;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background-position 0.5s ease;
    text-align: center;
}
.gradient-button {
    background: linear-gradient(45deg, #1A4A7F, #0D2A4B); 
    box-shadow: 0 5px 15px rgba(13, 42, 75, 0.3);
    background-size: 200% auto;
}
.gradient-button:hover,
.gradient-button:focus {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(13, 42, 75, 0.4);
    background-position: right center;
}
.partner-list {
    margin-top: 1.5em;
    text-align: center;
}
.partner-item-intro {
    font-size: 1.1rem;
    font-weight: 600;
    color: #1A4A7F;
    margin-bottom: 1em;
}
.partner-links-list {
    list-style: none;
    padding: 0;
}
.partner-links-list li {
    margin-bottom: 0.8em;
    font-size: 1rem;
    color: #555;
}
.partner-link-style {
    font-weight: bold;
    color: #007bff; 
    transition: color 0.3s ease, letter-spacing 0.3s ease;
}
.partner-link-style:hover {
    color: #0056b3; 
    letter-spacing: 0.5px;
}
.site-footer {
    background-color: #0D2A4B; 
    color: #adb5bd; 
    padding: 50px 0 0;
    font-size: 0.9rem;
}
.footer-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.footer-heading {
    font-size: 1.2rem;
    color: #FFFFFF;
    margin-bottom: 1.5em;
    font-weight: 600;
    position: relative;
}
.footer-heading::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 40px;
    height: 2px;
    background-color: #46C7F4; 
}
.footer-about p {
    color: #ced4da;
    line-height: 1.8;
}
.footer-logo {
    max-width: 120px;
    margin-top: 1.5em;
    opacity: 0.8;
}
.footer-links ul {
    list-style: none;
}
.footer-links ul li {
    margin-bottom: 0.8em;
}
.footer-links ul li a {
    color: #ced4da;
    transition: color 0.3s ease, padding-left 0.3s ease;
}
.footer-links ul li a:hover {
    color: #FFFFFF;
    padding-left: 5px;
    text-decoration: none;
}
.footer-contact p {
    color: #ced4da;
    margin-bottom: 0.8em;
}
.footer-contact .email-link,
.footer-contact .phone-link {
    color: #87CEFA; 
}
.footer-contact .email-link:hover,
.footer-contact .phone-link:hover {
    color: #FFFFFF;
}
.footer-bottom {
    text-align: center;
    padding: 25px 0;
    font-size: 0.85rem;
}
.footer-bottom p {
    margin-bottom: 0.5em;
    color: #adb5bd;
}
.footer-bottom a {
    color: #87CEFA;
    font-weight: 500;
}
.footer-bottom a:hover {
    color: #FFFFFF;
}
.cooperation-credit {
    font-weight: 500;
}
.cooperation-credit .partner-link-ref {
    font-weight: bold;
    color: #87CEFA;
}
.cooperation-credit .partner-link-ref:hover {
    color: #FFFFFF;
}
.cooperation-description {
    font-size: 0.82rem;
    line-height: 1.7;
    color: #9aa5b1;
    max-width: 800px;
    margin: 0.5em auto 0;
    text-align: center;
}
.cooperation-description .partner-link-ref {
    color: #87CEFA;
    font-weight: 600;
}
.cooperation-description .partner-link-ref:hover {
    color: #FFFFFF;
}
.section-title-h2,
.solution-item,
.platform-feature-item,
.benefit-item,
.offering-item,
.contact-form-main,
.hero-content > * {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s ease-out forwards;
}
.hero-content > *:nth-child(1) { animation-delay: 0.1s; }
.hero-content > *:nth-child(2) { animation-delay: 0.2s; }
.hero-content > *:nth-child(3) { animation-delay: 0.3s; }
.hero-content > *:nth-child(4) { animation-delay: 0.4s; }
.hero-content > *:nth-child(5) { animation-delay: 0.5s; }
.solution-grid > .solution-item:nth-child(1),
.platform-features-grid > .platform-feature-item:nth-child(1),
.content-ai-benefits > .benefit-item:nth-child(1),
.academy-offerings-grid > .offering-item:nth-child(1) {
    animation-delay: 0.2s;
}
.solution-grid > .solution-item:nth-child(2),
.platform-features-grid > .platform-feature-item:nth-child(2),
.content-ai-benefits > .benefit-item:nth-child(2),
.academy-offerings-grid > .offering-item:nth-child(2) {
    animation-delay: 0.4s;
}
.solution-grid > .solution-item:nth-child(3),
.platform-features-grid > .platform-feature-item:nth-child(3),
.content-ai-benefits > .benefit-item:nth-child(3),
.academy-offerings-grid > .offering-item:nth-child(3) {
    animation-delay: 0.6s;
}
@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
@media (max-width: 992px) {
    .header-container {
        flex-direction: column;
        align-items: flex-start;
    }
    .main-navigation {
        width: 100%;
        margin-top: 15px;
    }
    .main-navigation ul {
        flex-direction: column;
        align-items: flex-start;
        width: 100%;
    }
    .main-navigation ul li {
        margin-left: 0;
        width: 100%;
        border-bottom: 1px solid #e0e0e0;
    }
     .main-navigation ul li:last-child {
        border-bottom: none;
    }
    .main-navigation ul li a {
        display: block;
        padding: 12px 15px;
        width: 100%;
    }
    .submenu {
        position: static;
        box-shadow: none;
        border-radius: 0;
        padding-left: 20px;
        background-color: #f8f9fa; 
        opacity: 1;
        visibility: visible;
        transform: none;
        display: none; 
    }
    .has-submenu:hover .submenu, 
    .has-submenu:focus-within .submenu { 
        display: block; 
    }
     .has-submenu > a::after {
        float: right; 
    }
    .hero-images {
        flex-direction: column;
        align-items: center;
    }
    .hero-image-item {
        width: clamp(200px, 50vw, 350px);
        height: clamp(200px, 50vw, 350px);
    }
}
@media (max-width: 768px) {
    .solution-grid,
    .platform-features-grid,
    .content-ai-benefits,
    .academy-offerings-grid,
    .image-gallery-section {
        grid-template-columns: 1fr; 
    }
    .section-title-h2 {
        font-size: clamp(1.8rem, 5vw, 2.5rem);
    }
    .main-heading-h1 {
        font-size: clamp(2rem, 6vw, 3rem);
    }
    .footer-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .footer-heading::after {
        left: 50%;
        transform: translateX(-50%);
    }
    .footer-links ul, .footer-contact {
        text-align: center;
    }
}
@media (max-width: 480px) {
    .site-header {
        padding: 10px 0;
    }
    .logo-area .site-logo {
        height: 40px;
    }
    .main-navigation ul li a {
        font-size: 0.9rem;
        padding: 10px;
    }
    .hero-section {
        padding: clamp(30px, 8vh, 60px) 0;
    }
    .cta-button, .submit-button {
        font-size: 1rem;
        padding: 12px 25px;
    }
    .contact-form-main {
        padding: 20px;
    }
}
.text-center {
    text-align: center;
}
.mb-0 { margin-bottom: 0 !important; }
.mt-0 { margin-top: 0 !important; }
a:focus, button:focus, input:focus, textarea:focus {
    outline: 2px solid #46C7F4;
    outline-offset: 2px;
}
.submenu a:focus {
    background-color: #e0f7fa; 
}