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

:root {
    --primary-blue: #2875ba;
    --dark-text: #333333;
    --light-text: #666666;
    --white: #ffffff;
    --light-bg: #f5f5f5;
    --border-color: #dddddd;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--dark-text);
    background-color: var(--white);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

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

#main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 86px;
}

.logo_container a {
    display: inline-block;
}

.logo_container img {
    height: 53px;
    width: auto;
}

#top-menu-nav ul.nav {
    display: flex;
    list-style: none;
    gap: 30px;
}

#top-menu-nav ul.nav li a {
    color: var(--dark-text);
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    transition: color 0.3s ease;
}

#top-menu-nav ul.nav li a:hover {
    color: var(--primary-blue);
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, #2875ba 0%, #1a5a8a 100%);
    padding: 80px 0;
    text-align: center;
    color: var(--white);
}

.hero-content h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
}

.hero-content p {
    font-size: 20px;
    max-width: 800px;
    margin: 0 auto;
    opacity: 0.95;
}

/* Do More Section */
.do-more-section {
    padding: 80px 0;
    background-color: var(--white);
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-header h1 {
    font-size: 36px;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 15px;
}

.section-header p {
    font-size: 20px;
    color: var(--light-text);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-item {
    text-align: left;
    padding: 15px 20px;
    background: var(--white);
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    align-items: center;
    gap: 15px;
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 18px;
    color: var(--primary-blue);
    font-weight: bold;
    flex-shrink: 0;
}

.feature-item h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--dark-text);
}

/* Industries Section */
.industries-section {
    padding: 80px 0;
    background-color: var(--light-bg);
}

.industries-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

.industry-item {
    background: var(--white);
    padding: 15px;
    text-align: center;
    display: flex;
    flex-direction: column;
}

.industry-item h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--dark-text);
    margin-bottom: 15px;
    min-height: 24px;
}

.industry-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    margin-top: auto;
}

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

.section-link a {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 500;
    font-size: 16px;
}

.section-link a:hover {
    text-decoration: underline;
}

/* Products Section */
.products-section {
    padding: 80px 0;
    background-color: var(--white);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

.product-card {
    background: var(--white);
    border: 1px solid var(--border-color);
    padding: 30px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}

.product-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.product-card h4 {
    font-size: 20px;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 15px;
}

.product-card p {
    font-size: 14px;
    color: var(--light-text);
    margin-bottom: 15px;
    line-height: 1.5;
}

.learn-more {
    color: var(--primary-blue);
    font-weight: 500;
    font-size: 14px;
}

/* Features Detail Section */
.features-detail-section {
    padding: 80px 0;
    background-color: var(--light-bg);
}

.feature-detail-header {
    text-align: center;
    margin-bottom: 30px;
}

.feature-detail-header p {
    color: var(--primary-blue);
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 10px;
}

.feature-detail-header h1 {
    font-size: 36px;
    font-weight: 700;
    color: var(--dark-text);
}

.feature-detail-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 50px;
}

.feature-detail-content p {
    font-size: 16px;
    color: var(--light-text);
    line-height: 1.8;
}

.feature-detail-grid {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 40px;
    align-items: start;
}

.feature-detail-image img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.feature-detail-list h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 20px;
}

.feature-detail-list ul {
    list-style: none;
}

.feature-detail-list ul li {
    font-size: 15px;
    color: var(--light-text);
    padding: 8px 0;
    padding-left: 25px;
    position: relative;
}

.feature-detail-list ul li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    background-color: var(--primary-blue);
    border-radius: 50%;
}

.features-detail-section.alt-bg {
    background-color: var(--white);
}

.feature-detail-list h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--dark-text);
    margin-bottom: 15px;
    margin-top: 20px;
}

.feature-detail-list ul li ul {
    margin-left: 20px;
    margin-top: 10px;
}

/* Interfaces Grid */
.interfaces-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin-top: 40px;
}

.interface-item {
    text-align: center;
    padding: 30px;
    background: var(--light-bg);
    border-radius: 8px;
}

.interface-item img {
    width: 100%;
    max-width: 400px;
    height: auto;
    margin-bottom: 20px;
    border-radius: 8px;
}

.interface-item h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--dark-text);
}

/* Corrosion Section */
.corrosion-section {
    margin-bottom: 50px;
    padding: 30px;
    background: var(--white);
    border-radius: 8px;
    box-shadow: 0 3px 15px rgba(0, 0, 0, 0.05);
}

.corrosion-section h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--primary-blue);
}

.corrosion-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 30px;
    align-items: start;
}

.corrosion-content img {
    width: 100%;
    border-radius: 8px;
    box-shadow: 0 3px 15px rgba(0, 0, 0, 0.1);
}

.corrosion-content ul {
    list-style: none;
}

.corrosion-content ul li {
    font-size: 14px;
    color: var(--light-text);
    padding: 6px 0;
    padding-left: 20px;
    position: relative;
}

.corrosion-content ul li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    background-color: var(--primary-blue);
    border-radius: 50%;
}

.corrosion-content ul ul {
    margin-left: 15px;
    margin-top: 5px;
}

.tablet-benefits {
    margin-top: 40px;
    padding: 30px;
    background: var(--white);
    border-radius: 8px;
    box-shadow: 0 3px 15px rgba(0, 0, 0, 0.05);
}

.tablet-benefits h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 20px;
}

.tablet-benefits p {
    font-size: 15px;
    color: var(--light-text);
    line-height: 1.8;
}

/* Services Section */
.services-section {
    padding: 80px 0;
    background-color: var(--light-bg);
}

/* Footer Styles */
#main-footer {
    background-color: #1a1a1a;
    color: var(--white);
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo img {
    height: 60px;
}

.footer-links h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--white);
}

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

.footer-links ul li {
    margin-bottom: 10px;
}

.footer-links ul li a {
    color: #999999;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
}

.footer-links ul li a:hover {
    color: var(--white);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #333333;
}

.footer-bottom p {
    font-size: 14px;
    color: #999999;
}

/* Responsive Styles */
@media (max-width: 980px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .industries-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    #main-header .container {
        flex-direction: column;
        height: auto;
        padding: 15px 20px;
    }
    
    #top-menu-nav ul.nav {
        flex-wrap: wrap;
        justify-content: center;
        gap: 15px;
        margin-top: 15px;
    }
    
    .hero-content h1 {
        font-size: 32px;
    }
    
    .hero-content p {
        font-size: 16px;
    }
    
    .section-header h1 {
        font-size: 28px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .industries-grid {
        grid-template-columns: 1fr;
    }
    
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .feature-detail-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}