:root {
    --primary-blue: #00305f; /* Deep corporate blue from TAVA */
    --primary-teal: #00a480; /* Teal/Green from TAVA */
    --light-bg: #f8fbfb;
    --white: #ffffff;
    --text-main: #333333;
    --text-muted: #666666;
    --border-color: #e5e7eb;
    
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Roboto', sans-serif;
    --transition: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--light-bg);
    color: var(--text-main);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

/* Typography */
h1, h2, h3, h4 {
    font-family: var(--font-heading);
    color: var(--primary-blue);
}

.section-title {
    font-size: 2.2rem;
    margin-bottom: 3rem;
    position: relative;
    font-weight: 700;
}

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

.center-align::after {
    content: '';
    position: absolute;
    width: 80px;
    height: 4px;
    background: var(--primary-teal);
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 2px;
}

.left-align::after {
    content: '';
    position: absolute;
    width: 60px;
    height: 4px;
    background: var(--primary-teal);
    bottom: -15px;
    left: 0;
    border-radius: 2px;
}

.subtitle-center {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 3rem auto;
    font-size: 1.1rem;
    color: var(--text-muted);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    border-radius: 5px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    font-family: var(--font-heading);
}

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

.btn-primary:hover {
    background-color: transparent;
    color: var(--primary-teal);
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1.2rem 0;
    z-index: 1000;
    transition: var(--transition);
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 15px rgba(0,0,0,0.05);
    backdrop-filter: blur(10px);
}

.navbar.scrolled {
    padding: 0.8rem 0;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

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

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo-img {
    height: 50px;
    width: auto;
    border-radius: 4px;
    transition: var(--transition);
}

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

.footer-logo-img {
    height: 70px;
    width: auto;
    border-radius: 8px;
    background: var(--white);
    padding: 8px;
    transition: var(--transition);
}

.logo:hover .footer-logo-img {
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(0, 164, 128, 0.4);
}

.hero-logo-img {
    height: 140px;
    width: auto;
    margin-bottom: 2rem;
    border-radius: 15px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.3);
    border: 3px solid rgba(255,255,255,0.4);
    transition: var(--transition);
    background: var(--white); /* In case it's transparent, ensure contrast */
    padding: 10px;
}

.hero-logo-img:hover {
    transform: scale(1.05) translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 164, 128, 0.5);
    border-color: var(--primary-teal);
}

.nav-links {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--primary-blue);
    font-weight: 600;
    transition: var(--transition);
    font-size: 0.95rem;
    text-transform: uppercase;
}

.nav-links a:hover:not(.btn) {
    color: var(--primary-teal);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, rgba(0, 48, 95, 0.75) 0%, rgba(0, 164, 128, 0.75) 100%), url('headquarters.jpg') center/cover no-repeat;
    /* We keep the image but overlay it with brand colors for a cohesive look */
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    padding-top: 80px;
    color: var(--white);
}

.company-name {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    color: var(--white);
    letter-spacing: 2px;
}

.company-name-en {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: 3rem;
    letter-spacing: 3px;
    color: #e0f2fe;
}

.slogan-box {
    display: inline-block;
    padding: 2rem 4rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 10px;
    border-left: 5px solid var(--primary-teal);
}

.slogan {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 0.5rem;
}

.slogan-vn {
    font-size: 1.2rem;
    color: #d1fae5;
    font-style: italic;
}

/* About Section */
.about-section {
    padding: 6rem 0;
    background: var(--white);
}

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

.lead-text {
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--primary-blue);
    margin-bottom: 1.5rem;
}

.about-text p {
    margin-bottom: 1.5rem;
    color: var(--text-muted);
}

.company-info-box {
    margin-top: 2rem;
    background: var(--light-bg);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--primary-teal);
}

.company-info-box ul {
    list-style: none;
}

.company-info-box li {
    margin-bottom: 1rem;
    display: flex;
    align-items: flex-start;
    gap: 15px;
}

.company-info-box li:last-child {
    margin-bottom: 0;
}

.company-info-box i {
    color: var(--primary-teal);
    font-size: 1.2rem;
    margin-top: 4px;
}

.about-img {
    width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
    display: block;
}

.image-placeholder p {
    font-size: 1.2rem;
    font-weight: 600;
    font-family: var(--font-heading);
}

/* Vision Mission Core Values */
.v-m-c-section {
    padding: 6rem 0;
    background: var(--light-bg);
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.vmc-card {
    background: var(--white);
    padding: 3rem 2rem;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
    transition: var(--transition);
    border-bottom: 4px solid transparent;
}

.vmc-card:hover {
    transform: translateY(-10px);
    border-bottom-color: var(--primary-teal);
    box-shadow: 0 15px 30px rgba(0,0,0,0.1);
}

.vmc-icon {
    width: 80px;
    height: 80px;
    background: rgba(0, 164, 128, 0.1);
    color: var(--primary-teal);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2.5rem;
    margin: 0 auto 2rem auto;
    transition: var(--transition);
}

.vmc-card:hover .vmc-icon {
    background: var(--primary-teal);
    color: var(--white);
}

.vmc-card h3 {
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.vmc-card p {
    color: var(--text-muted);
}

/* Activities Section */
.activities-section {
    padding: 6rem 0;
    background: var(--white);
}

.activities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.activity-card {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2.5rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.activity-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary-teal);
    transform: scaleY(0);
    transition: var(--transition);
    transform-origin: bottom;
}

.activity-card:hover::before {
    transform: scaleY(1);
}

.activity-card:hover {
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}

.activity-img-wrapper {
    width: 100%;
    height: 220px;
    overflow: hidden;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    background: #f8fafc;
}

.activity-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.activity-card:hover .activity-img {
    transform: scale(1.08);
}

.act-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 1.5rem;
}

.act-header i {
    font-size: 2rem;
    color: var(--primary-blue);
}

.act-header h3 {
    font-size: 1.2rem;
    color: var(--primary-blue);
}

.act-list {
    list-style: none;
}

.act-list li {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-muted);
}

.act-list li::before {
    content: '■';
    color: var(--primary-teal);
    position: absolute;
    left: 0;
    top: 0;
    font-size: 0.8rem;
}

/* Machinery & Projects */
.machinery-section {
    padding: 6rem 0;
    background: var(--light-bg);
}

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

.tab-btn {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-family: var(--font-heading);
    font-weight: 600;
    border: none;
    background: #e2e8f0;
    color: var(--text-muted);
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 10px;
}

.tab-btn.active {
    background: var(--primary-teal);
    color: var(--white);
    box-shadow: 0 10px 20px rgba(0, 164, 128, 0.3);
}

.tab-btn:hover:not(.active) {
    background: #cbd5e1;
    color: var(--primary-blue);
}

.tab-content {
    display: none;
    animation: fadeIn 0.5s ease;
}

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

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

.equip-img-wrapper {
    background: var(--white);
    padding: 1rem;
    border-radius: 15px;
    box-shadow: 0 15px 40px rgba(0,0,0,0.08);
    border: 1px solid var(--border-color);
    max-width: 900px;
    margin: 0 auto 5rem auto;
}

.equip-img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    display: block;
}

.sub-title-projects {
    text-align: center;
    font-size: 1.8rem;
    margin-bottom: 3rem;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.project-item {
    background: var(--white);
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.project-item:hover {
    border-color: var(--primary-teal);
    transform: translateY(-5px);
}

.project-item i {
    font-size: 2.5rem;
    color: var(--primary-teal);
    margin-bottom: 1.5rem;
}

.project-item h4 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

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

.project-img-wrapper {
    width: 100%;
    height: 180px;
    overflow: hidden;
    border-radius: 6px;
    margin-bottom: 1.5rem;
    background: #f1f5f9;
}

.project-card-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.project-item:hover .project-card-img {
    transform: scale(1.1);
}

/* Footer */
.footer {
    background: #001a33;
    color: #cbd5e1;
}

.footer-top {
    padding: 5rem 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 4rem;
}

.footer-brand .logo {
    margin-bottom: 1rem;
}

.brand-desc {
    font-size: 1.2rem;
    color: var(--white);
    margin-bottom: 0.5rem;
}

.mst {
    color: var(--primary-teal);
    font-weight: 500;
}

.footer-contact h3, .footer-network h3 {
    color: var(--white);
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
}

.footer-contact ul, .footer-network ul {
    list-style: none;
}

.footer-contact li, .footer-network li {
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 15px;
}

.footer-contact i, .footer-network i {
    color: var(--primary-teal);
    width: 20px;
    text-align: center;
}

.footer-contact strong, .footer-network strong {
    color: var(--white);
}

.footer-bottom {
    background: #001224;
    padding: 1.5rem 0;
    text-align: center;
    border-top: 1px solid rgba(255,255,255,0.05);
}

/* Responsive */
@media (max-width: 992px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    .activities-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .company-name {
        font-size: 2.5rem;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .nav-links {
        display: none;
    }
    
    .slogan-box {
        padding: 1.5rem 2rem;
    }
}