/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: 2.5rem;
    color: #1a365d;
}

h2 {
    font-size: 2rem;
    color: #2d3748;
    margin-bottom: 1.5rem;
}

h3 {
    font-size: 1.5rem;
    color: #2d3748;
}

p {
    margin-bottom: 1rem;
    color: #4a5568;
}

/* Header Styles */
.header {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1a365d;
    text-decoration: none;
}

.nav {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav a {
    text-decoration: none;
    color: #4a5568;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav a:hover,
.nav a.active {
    color: #3182ce;
}

/* Language Selector */
.language-selector {
    position: relative;
}

.language-dropdown {
    background: #f7fafc;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    padding: 0.5rem 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.language-dropdown:after {
    content: '▼';
    font-size: 0.8rem;
}

.language-options {
    position: absolute;
    top: 100%;
    right: 0;
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    min-width: 200px;
    max-height: 300px;
    overflow-y: auto;
    display: none;
    z-index: 1001;
}

.language-options.show {
    display: block;
}

.language-option {
    padding: 0.75rem 1rem;
    cursor: pointer;
    transition: background-color 0.2s ease;
    border-bottom: 1px solid #f7fafc;
}

.language-option:hover {
    background-color: #f7fafc;
}

.language-option:last-child {
    border-bottom: none;
}

/* Mobile Menu */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: #4a5568;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 0;
    min-height: 70vh;
    display: flex;
    align-items: center;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.hero h1 {
    color: white;
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

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

.hero-image img {
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    text-align: center;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    cursor: pointer;
}

.btn-primary {
    background: #3182ce;
    color: white;
    border-color: #3182ce;
}

.btn-primary:hover {
    background: #2c5aa0;
    border-color: #2c5aa0;
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: white;
    border-color: white;
}

.btn-secondary:hover {
    background: white;
    color: #3182ce;
}

.btn-outline {
    background: transparent;
    color: #3182ce;
    border-color: #3182ce;
}

.btn-outline:hover {
    background: #3182ce;
    color: white;
}

/* Sections */
section {
    padding: 4rem 0;
}

.introduction {
    background: #f7fafc;
}

.intro-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    align-items: start;
}

.intro-text {
    font-size: 1.1rem;
}

.learn-more {
    color: #3182ce;
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    margin-top: 1rem;
}

.learn-more:hover {
    text-decoration: underline;
}

.intro-features h3 {
    margin-bottom: 1rem;
    color: #1a365d;
}

.intro-features ul {
    list-style: none;
}

.intro-features li {
    padding: 0.5rem 0;
    position: relative;
    padding-left: 1.5rem;
}

.intro-features li:before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #38a169;
    font-weight: bold;
}

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

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

/* Applications */
.applications-preview {
    background: #f7fafc;
}

.applications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.application-item {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.application-item:hover {
    transform: translateY(-5px);
}

.application-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.application-item h3,
.application-item p {
    padding: 0 1.5rem;
}

.application-item h3 {
    padding-top: 1.5rem;
    margin-bottom: 0.5rem;
}

.application-item p {
    padding-bottom: 1.5rem;
    color: #666;
}

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

/* CTA Section */
.cta {
    background: linear-gradient(135deg, #1a365d 0%, #2d3748 100%);
    color: white;
    text-align: center;
}

.cta h2 {
    color: white;
    margin-bottom: 1rem;
}

.cta p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Footer */
.footer {
    background: #1a202c;
    color: white;
    padding: 3rem 0 1rem;
}

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

.footer-section h3 {
    color: white;
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: #cbd5e0;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid #2d3748;
    padding-top: 1rem;
    text-align: center;
    color: #cbd5e0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .header-content {
        flex-wrap: wrap;
    }
    
    .nav {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: 1rem;
        padding: 1rem 0;
    }
    
    .nav.show {
        display: flex;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .intro-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .applications-grid {
        grid-template-columns: 1fr;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}

/* Performance Optimizations */
img {
    max-width: 100%;
    height: auto;
}

/* Accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Focus styles for accessibility */
a:focus,
button:focus,
.language-dropdown:focus {
    outline: 2px solid #3182ce;
    outline-offset: 2px;
}

/* Import additional styles */
@import url('additional.css');

/* 3D Model Section Styles */
.model-section {
    background: #fff;
    padding: 4rem 0;
}

.model-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.model-image {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.model-image img {
    width: 100%;
    height: auto;
    transition: transform 0.5s ease;
    border-radius: 12px;
}

.model-image img.rotated {
    transform: rotateY(180deg);
}

.model-image img.zoomed {
    transform: scale(1.5);
}

.model-controls {
    position: absolute;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 0.5rem;
    background: rgba(255,255,255,0.9);
    padding: 0.75rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.model-btn {
    background: #3182ce;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.3s ease;
}

.model-btn:hover {
    background: #2c5aa0;
}

.model-info h3 {
    color: #1a365d;
    margin-bottom: 1rem;
}

.model-info ul {
    list-style: none;
    margin-bottom: 1.5rem;
}

.model-info li {
    padding: 0.5rem 0;
    position: relative;
    padding-left: 1.5rem;
    color: #4a5568;
}

.model-info li:before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #38a169;
    font-weight: bold;
}

.model-info p {
    margin-bottom: 1.5rem;
    color: #666;
}

/* Industrial Image in Intro */
.industrial-image {
    margin-top: 2rem;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.industrial-image img {
    width: 100%;
    height: auto;
}

.image-caption {
    text-align: center;
    font-size: 0.9rem;
    color: #666;
    margin-top: 0.5rem;
    font-style: italic;
}

/* Print styles */
@media print {
    .header,
    .footer,
    .cta {
        display: none;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.4;
    }
    
    h1, h2, h3 {
        page-break-after: avoid;
    }
}

/* Responsive adjustments for model section */
@media (max-width: 968px) {
    .model-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .model-controls {
        position: static;
        transform: none;
        justify-content: center;
        margin-top: 1rem;
    }
}

@media (max-width: 480px) {
    .model-controls {
        flex-direction: column;
        align-items: center;
    }
    
    .model-btn {
        width: 100%;
        margin-bottom: 0.5rem;
    }
}