/* --- CSS Variables & Design System --- */
:root {
    /* Colors */
    --primary: #104886; /* Deep Industrial Blue */
    --primary-light: #2563eb;
    --primary-dark: #07274b;
    --accent: #0ea5e9; /* Light Blue Accent */
    --accent-hover: #0284c7;
    
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --bg-dark: #0f172a;
    --bg-dark-secondary: #1e293b;
    
    --text-primary: #334155;
    --text-secondary: #64748b;
    --text-light: #f1f5f9;
    
    /* Typography */
    --font-main: 'Inter', sans-serif;
    
    /* Layout */
    --container-max: 1200px;
    --nav-height: 80px;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    
    /* Transitions */
    --trans-fast: 0.2s ease;
    --trans-normal: 0.3s ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: var(--trans-fast);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* --- Utilities --- */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 6rem 0;
}

.text-center { text-align: center; }
.bg-light { background-color: var(--bg-light); }
.bg-dark { background-color: var(--bg-dark); }
.text-white { color: var(--text-light); }

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: var(--primary-dark);
}

.bg-dark .section-title {
    color: var(--bg-white);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
}

.lead-text {
    font-size: 1.25rem;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.bg-dark .lead-text {
    color: var(--accent);
}

/* --- Buttons --- */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    text-align: center;
    border: 2px solid transparent;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-primary {
    background-color: var(--primary);
    color: var(--bg-white);
}

.btn-primary:hover {
    background-color: var(--primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    border-color: var(--bg-white);
    color: var(--bg-white);
}

.btn-outline:hover {
    background-color: var(--bg-white);
    color: var(--primary-dark);
}

.btn-full {
    width: 100%;
}

/* --- Header / Navigation --- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: var(--shadow-sm);
    transition: all var(--trans-normal);
}

.header.scrolled {
    height: 70px;
    box-shadow: var(--shadow-md);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-dark);
    letter-spacing: -0.5px;
}

.logo-accent {
    color: var(--primary);
    font-weight: 400;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link:not(.btn) {
    font-weight: 600;
    color: var(--text-primary);
    position: relative;
}

.nav-link:not(.btn)::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary);
    transition: var(--trans-fast);
}

.nav-link:not(.btn):hover {
    color: var(--primary);
}

.nav-link:not(.btn):hover::after {
    width: 100%;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    width: 30px;
    height: 24px;
    position: relative;
    z-index: 1001;
}

.bar {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--primary-dark);
    position: absolute;
    left: 0;
    transition: var(--trans-fast);
}

.bar:nth-child(1) { top: 0; }
.bar:nth-child(2) { top: 11px; }
.bar:nth-child(3) { bottom: 0; }

.mobile-menu-btn.active .bar:nth-child(1) {
    transform: rotate(45deg);
    top: 11px;
}
.mobile-menu-btn.active .bar:nth-child(2) { opacity: 0; }
.mobile-menu-btn.active .bar:nth-child(3) {
    transform: rotate(-45deg);
    bottom: 11px;
}

/* Mobile Nav Dropdown */
.mobile-nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 400px;
    height: 100vh;
    background-color: var(--bg-white);
    box-shadow: -5px 0 15px rgba(0,0,0,0.1);
    z-index: 999;
    padding: 100px 2rem 2rem;
    transition: right 0.4s ease;
}

.mobile-nav-menu.open {
    right: 0;
}

.mobile-nav-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.mobile-nav-list li {
    font-size: 1.2rem;
}

/* --- Hero Section --- */
.hero {
    height: 100vh;
    min-height: 600px;
    position: relative;
    display: flex;
    align-items: center;
    color: var(--bg-white);
    padding-top: var(--nav-height);
    overflow: hidden;
}

.hero-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: -2;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, rgba(15, 23, 42, 0.9), rgba(15, 23, 42, 0.4));
    z-index: -1;
}

.hero-container {
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 800px;
}

.badge {
    display: inline-block;
    padding: 0.25rem 1rem;
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50px;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1.5rem;
    backdrop-filter: blur(4px);
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    color: #e2e8f0;
    max-width: 600px;
}

.hero-actions {
    display: flex;
    gap: 1rem;
}

/* --- Two Column Layout --- */
.two-col-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

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

/* Image Wrappers */
.image-wrapper {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

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

.image-wrapper:hover img {
    transform: scale(1.03);
}

.with-accent::before {
    content: '';
    position: absolute;
    top: -15px;
    left: -15px;
    width: 100%;
    height: 100%;
    border: 4px solid var(--accent);
    border-radius: var(--radius-lg);
    z-index: -1;
}

.offset-border {
    border: 8px solid rgba(255,255,255,0.1);
}

/* Stats in About Section */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid #e2e8f0;
}

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

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 600;
}

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

.product-card {
    background-color: var(--bg-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--trans-normal);
}

.product-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.product-img {
    height: 250px;
    overflow: hidden;
    position: relative;
}

.product-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--trans-normal);
}

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

.product-overlay {
    position: absolute;
    inset: 0;
    background-color: rgba(16, 72, 134, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--trans-normal);
    color: var(--bg-white);
    font-weight: 600;
}

.product-card:hover .product-overlay {
    opacity: 1;
}

.product-info {
    padding: 1.5rem;
}

.product-info h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--primary-dark);
}

.product-info p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* --- Quality Control Feature List --- */
.feature-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-top: 2rem;
}

.feature-list li {
    display: flex;
    gap: 1.25rem;
    align-items: flex-start;
}

.feature-list svg {
    flex-shrink: 0;
    color: var(--accent);
    width: 32px;
    height: 32px;
    margin-top: 4px;
}

.feature-list h4 {
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
}

/* --- Contact Section --- */
.contact-card {
    background-color: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    overflow: hidden;
}

.contact-info {
    background-color: var(--primary);
    color: var(--bg-white);
    padding: 4rem 3rem;
}

.contact-info h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.contact-info p {
    margin-bottom: 3rem;
    opacity: 0.9;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.method strong {
    display: block;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.8;
    margin-bottom: 0.25rem;
}

.method p {
    margin-bottom: 0;
    font-size: 1.125rem;
    font-weight: 600;
    opacity: 1;
}

.contact-form-container {
    padding: 4rem 3rem;
    position: relative;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group.row {
    display: flex;
    gap: 1.5rem;
}

.half-width {
    flex: 1;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.875rem;
}

input, select, textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid #cbd5e1;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--trans-fast);
    background-color: var(--bg-light);
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(16, 72, 134, 0.1);
}

/* Form Success state */
.form-success {
    position: absolute;
    inset: 0;
    background-color: var(--bg-white);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem;
    z-index: 10;
}

.form-success.hidden {
    display: none;
}

.form-success svg {
    width: 64px;
    height: 64px;
    margin-bottom: 1.5rem;
}

.form-success h3 {
    font-size: 1.5rem;
    color: var(--primary-dark);
    margin-bottom: 0.5rem;
}

/* --- Footer --- */
.footer {
    background-color: var(--bg-dark-secondary);
    color: #cbd5e1;
    padding-top: 4rem;
}

.footer-container {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-logo {
    color: var(--bg-white);
    margin-bottom: 1rem;
    display: inline-block;
}

.footer-col h4 {
    color: var(--bg-white);
    margin-bottom: 1.5rem;
    font-size: 1.125rem;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-links a:hover {
    color: var(--bg-white);
    padding-left: 5px;
}

.footer-bottom {
    background-color: var(--bg-dark);
    padding: 1.5rem 0;
    text-align: center;
    font-size: 0.875rem;
}

/* --- Animations --- */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.slide-in-right {
    opacity: 0;
    transform: translateX(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in-up.visible, 
.slide-in-left.visible, 
.slide-in-right.visible {
    opacity: 1;
    transform: translate(0);
}

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }

/* --- Responsive --- */
@media (max-width: 992px) {
    .hero-title { font-size: 3rem; }
    .two-col-layout {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    .reverse-mobile {
        display: flex;
        flex-direction: column-reverse;
    }
    .contact-card {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav { display: none; }
    .mobile-menu-btn { display: block; }
    
    .hero-title { font-size: 2.25rem; }
    .hero-actions { flex-direction: column; }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .form-group.row { flex-direction: column; gap: 0; }
    
    .footer-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}