@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&display=swap');
:root {
    --primary-color: #005f6b;
    --primary-color-light: #008c9e;
    --secondary-color: #222222;
    --accent-color: #c4b489;
    --accent-color-dark: #a18f63;
    --background-color: #f8f9fa;
    --white-color: #ffffff;
    --text-color: #4a4a4a;
    --border-color: #e1e1e1;
    --gradient-primary: linear-gradient(135deg, var(--primary-color-light) 0%, var(--primary-color) 100%);
    --gradient-accent: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-color-dark) 100%);
    --shadow-light: 0 4px 15px rgba(0, 0, 0, 0.05);
    --shadow-medium: 0 8px 30px rgba(0, 0, 0, 0.1);
    --transition-fast: all 0.2s ease-in-out;
    --transition-medium: all 0.4s ease-in-out;
}
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html {
    font-size: 16px;
    scroll-behavior: smooth;
}
body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}
h1, h2, h3, h4, h5, h6 {
    color: var(--secondary-color);
    font-weight: 600;
    line-height: 1.3;
}
h1 { font-size: 3.5rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.2rem; }
p { margin-bottom: 1rem; }
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition-fast);
}
a:hover {
    color: var(--primary-color-light);
}
img {
    max-width: 100%;
    height: auto;
    display: block;
}
ul {
    list-style: none;
}
.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}
.content-section {
    padding: 6rem 0;
}
.section-title {
    text-align: center;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-fill-color: transparent;
}
.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--gradient-accent);
    border-radius: 2px;
}
.section-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 4rem auto;
    font-size: 1.1rem;
    color: #666;
}
.main-header {
    position: sticky;
    top: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow-light);
    transition: var(--transition-medium);
}
.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
    padding: 0 2rem;
    max-width: 1400px;
    margin: 0 auto;
}
.logo {
    max-height: 50px;
    width: auto;
    transition: var(--transition-medium);
}
.logo-link:hover .logo {
    transform: scale(1.05);
}
.main-nav ul {
    display: flex;
}
.main-nav ul li {
    position: relative;
    margin: 0 1.2rem;
}
.main-nav ul li a {
    color: var(--secondary-color);
    font-weight: 500;
    padding: 1rem 0;
    position: relative;
    display: block;
}
.main-nav ul li a::after {
    content: '';
    position: absolute;
    bottom: 0.5rem;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--accent-color);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.4s cubic-bezier(0.19, 1, 0.22, 1);
}
.main-nav ul li a:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}
.main-nav .submenu {
    position: absolute;
    top: 100%;
    left: -20px;
    background-color: var(--white-color);
    box-shadow: var(--shadow-medium);
    border-radius: 8px;
    padding: 1rem;
    width: 240px;
    display: flex;
    flex-direction: column;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
}
.main-nav li:hover > .submenu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.main-nav .submenu li {
    margin: 0;
    width: 100%;
}
.main-nav .submenu li a {
    padding: 0.75rem 1rem;
    width: 100%;
    border-radius: 5px;
}
.main-nav .submenu li a:hover {
    background-color: var(--background-color);
    color: var(--primary-color);
}
.main-nav .submenu li a::after {
    display: none;
}
#hero {
    min-height: calc(100vh - 80px);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 4rem 2rem;
}
.hero-content {
    max-width: 800px;
    animation: fadeInUp 1s ease-out forwards;
}
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
.main-heading {
    margin-bottom: 1rem;
    font-weight: 700;
    letter-spacing: -1px;
}
.partnership-notice {
    font-size: 1rem;
    color: #666;
    margin: 1.5rem auto;
    max-width: 600px;
    font-style: italic;
}
.contact-form-wrapper {
    margin-top: 2.5rem;
    background: var(--white-color);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-medium);
}
.form-title {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}
.hero-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.hero-form input,
.hero-form textarea {
    width: 100%;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-family: 'Poppins', sans-serif;
    font-size: 1rem;
    transition: var(--transition-fast);
}
.hero-form input:focus,
.hero-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 95, 107, 0.1);
}
.contact-link {
    background: var(--gradient-primary);
    color: #fff;
    border: none;
    padding: 1rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    background-size: 200% auto;
}
.contact-link:hover {
    background-position: right center;
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 95, 107, 0.2);
}
#ve-chung-toi .about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}
.about-card {
    background: var(--white-color);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-light);
    transition: var(--transition-medium);
    text-align: center;
}
.about-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-medium);
}
.about-card .sub-title {
    margin-bottom: 1rem;
    color: var(--primary-color);
}
.about-card .content-img {
    margin-top: 2rem;
    border-radius: 8px;
    width: 100%;
    height: 250px;
    object-fit: cover;
}
#giai-phap {
    background-color: var(--white-color);
}
.solution-category {
    margin-bottom: 5rem;
}
.category-title {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2rem;
    position: relative;
}
.solution-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}
.solution-item {
    text-align: center;
    overflow: hidden;
    border-radius: 12px;
    background: var(--background-color);
    box-shadow: var(--shadow-light);
    transition: var(--transition-medium);
}
.solution-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-medium);
}
.solution-item img {
    width: 100%;
    height: 280px;
    object-fit: cover;
    transition: transform 0.5s cubic-bezier(0.165, 0.84, 0.44, 1);
}
.solution-item:hover img {
    transform: scale(1.05);
}
.solution-item h4 {
    margin: 1.5rem 1rem 0.5rem 1rem;
    color: var(--primary-color);
}
.solution-item p {
    padding: 0 1.5rem 1.5rem 1.5rem;
    font-size: 0.95rem;
}
#cong-nghe {
    background-color: var(--background-color);
}
.tech-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}
.tech-item {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-medium);
}
.tech-item img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    transition: var(--transition-medium);
}
.tech-item figcaption {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 1rem;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
    color: var(--white-color);
    font-weight: 600;
    font-size: 1.2rem;
    text-align: center;
    transform: translateY(100%);
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
}
.tech-item:hover img {
    transform: scale(1.1);
}
.tech-item:hover figcaption {
    transform: translateY(0);
    opacity: 1;
}
#hanh-trinh {
    background-color: var(--white-color);
}
.journey-gallery {
    column-count: 4;
    column-gap: 1.5rem;
}
.journey-gallery img {
    margin-bottom: 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-light);
    transition: var(--transition-medium);
    width: 100%;
}
.journey-gallery img:hover {
    transform: scale(1.03);
    box-shadow: var(--shadow-medium);
    filter: brightness(1.1);
}
#kien-thuc {
    background-color: var(--background-color);
}
.knowledge-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}
.knowledge-card {
    background-color: var(--white-color);
    border-radius: 12px;
    box-shadow: var(--shadow-light);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: var(--transition-medium);
}
.knowledge-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-medium);
}
.knowledge-card img {
    width: 100%;
    height: 250px;
    object-fit: cover;
}
.knowledge-card h3 {
    font-size: 1.25rem;
    padding: 1.5rem 1.5rem 0.5rem 1.5rem;
    flex-grow: 1;
}
.knowledge-card p {
    padding: 0 1.5rem;
    font-size: 0.95rem;
}
.read-more {
    display: inline-block;
    margin: 1rem 1.5rem 1.5rem 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
}
.read-more::after {
    content: '→';
    margin-left: 0.5rem;
    transition: var(--transition-fast);
}
.read-more:hover::after {
    margin-left: 1rem;
}
#partners {
    background-color: var(--white-color);
}
.partner-ecosystem {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 3rem;
}
.partner-category {
    background: var(--background-color);
    padding: 2.5rem;
    border-radius: 12px;
    border-left: 5px solid var(--accent-color);
    transition: var(--transition-medium);
}
.partner-category:hover {
    box-shadow: var(--shadow-medium);
    transform: scale(1.02);
}
.partner-category .category-title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}
.partner-category .category-description {
    font-size: 1rem;
    line-height: 1.8;
}
.dofollow-link {
    font-weight: 500;
    position: relative;
    white-space: nowrap;
}
.dofollow-link::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 1px;
    bottom: -2px;
    left: 0;
    background-color: var(--accent-color);
    transform: scaleX(0);
    transform-origin: bottom right;
    transition: transform 0.3s ease-out;
}
.dofollow-link:hover::after {
    transform: scaleX(1);
    transform-origin: bottom left;
}
.main-footer {
    background-color: var(--secondary-color);
    color: rgba(255, 255, 255, 0.7);
    padding: 4rem 0;
}
.footer-container {
    display: flex;
    justify-content: space-between;
    gap: 3rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}
.footer-info {
    max-width: 400px;
}
.footer-logo {
    max-height: 60px;
    margin-bottom: 1.5rem;
}
.footer-info p {
    margin-bottom: 0.5rem;
}
.footer-credits {
    max-width: 600px;
    text-align: right;
    font-size: 0.9rem;
}
.footer-credits .credit-text {
    margin-bottom: 2rem;
}
.footer-credits a {
    color: var(--accent-color);
    font-weight: 500;
}
.footer-credits a:hover {
    color: var(--white-color);
    text-decoration: underline;
}
.copyright {
    color: rgba(255, 255, 255, 0.5);
    margin-top: 2rem;
}
@media (max-width: 1200px) {
    .section-container {
        padding: 0 1.5rem;
    }
}
@media (max-width: 992px) {
    h1 { font-size: 2.8rem; }
    h2 { font-size: 2.2rem; }
    .header-container {
        padding: 0 1.5rem;
    }
    .main-nav { display: none; }
    #ve-chung-toi .about-grid,
    #giai-phap .solution-grid,
    #kien-thuc .knowledge-grid {
        grid-template-columns: 1fr;
    }
    #cong-nghe .tech-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    #hanh-trinh .journey-gallery {
        column-count: 2;
    }
    #partners .partner-ecosystem {
        grid-template-columns: 1fr;
    }
    .footer-container {
        flex-direction: column;
        text-align: center;
    }
    .footer-info, .footer-credits {
        max-width: 100%;
        text-align: center;
    }
    .footer-logo {
        margin-left: auto;
        margin-right: auto;
    }
}
@media (max-width: 768px) {
    .content-section {
        padding: 4rem 0;
    }
    h1 { font-size: 2.2rem; }
    h2 { font-size: 1.8rem; }
    #cong-nghe .tech-grid {
        gap: 1rem;
    }
    #hanh-trinh .journey-gallery {
        column-count: 1;
    }
    #partners .partner-ecosystem {
        gap: 2rem;
    }
    .partner-category {
        padding: 2rem;
    }
    .hero-content, .contact-form-wrapper {
        padding: 0;
    }
    .contact-form-wrapper {
        padding: 2rem;
    }
}
@media (max-width: 576px) {
    html {
        font-size: 15px;
    }
    .section-container {
        padding: 0 1rem;
    }
    .header-container {
        padding: 0 1rem;
    }
    .logo {
        max-height: 40px;
    }
}