/* ===================================
   CSS RESET & BASE STYLES
   =================================== */

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

:root {
    /* Primary color palette - Oil Industry theme */
    --primary-dark: #0a1929;
    --primary-blue: #1e3a5f;
    --primary-teal: #2c7a7b;
    --accent-orange: #e67e22;
    --accent-gold: #f39c12;
    
    /* Neutral colors */
    --white: #ffffff;
    --light-gray: #f7f9fc;
    --medium-gray: #e2e8f0;
    --dark-gray: #4a5568;
    --text-dark: #1a202c;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #1e3a5f 0%, #2c7a7b 100%);
    --gradient-overlay: linear-gradient(135deg, rgba(30, 58, 95, 0.9) 0%, rgba(44, 122, 123, 0.85) 100%);
    
    /* Typography */
    --font-primary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-heading: 'Segoe UI', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 5rem;
    
    /* Border radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

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

/* ===================================
   HEADER & NAVIGATION
   =================================== */

.site-header {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition-smooth);
}

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

.logo a {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-blue);
    letter-spacing: -0.5px;
}

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

.main-nav a {
    color: var(--dark-gray);
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-teal);
    transition: width var(--transition-smooth);
}

.main-nav a:hover {
    color: var(--primary-teal);
}

.main-nav a:hover::after {
    width: 100%;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--primary-blue);
    border-radius: 3px;
    transition: var(--transition-smooth);
}

/* ===================================
   HERO SECTIONS
   =================================== */

.hero-section {
    position: relative;
    min-height: 600px;
    display: flex;
    align-items: center;
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.hero-background::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-overlay);
}

.hero-background img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-content {
    position: relative;
    z-index: 10;
    color: var(--white);
    max-width: 800px;
}

.hero-content h1 {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.hero-content p {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.95;
}

.page-hero {
    min-height: 400px;
}

.page-hero h1 {
    font-size: 3rem;
}

/* ===================================
   BUTTONS
   =================================== */

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-smooth);
    border: none;
    font-size: 1rem;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    background: var(--primary-blue);
    color: var(--white);
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin-top: var(--spacing-md);
}

/* ===================================
   SECTIONS
   =================================== */

section {
    padding: var(--spacing-xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-header h2 {
    font-size: 2.5rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
}

.section-header p {
    font-size: 1.25rem;
    color: var(--dark-gray);
}

.alt-bg {
    background: var(--light-gray);
}

/* ===================================
   CARDS & GRIDS
   =================================== */

.service-card,
.feature-card,
.review-card,
.product-card,
.term-card,
.cert-card,
.info-card {
    background: var(--white);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-smooth);
    height: 100%;
}

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

.service-card img,
.feature-card img,
.product-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
}

.services-grid,
.about-features,
.reviews-grid,
.products-grid,
.terms-grid,
.cert-grid,
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.service-card h3,
.feature-card h3,
.product-card h3 {
    color: var(--primary-blue);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.service-card p,
.feature-card p,
.product-card p {
    color: var(--dark-gray);
    margin-bottom: var(--spacing-sm);
}

.service-card ul {
    list-style: none;
    padding-left: 0;
    margin: var(--spacing-sm) 0;
}

.service-card li {
    padding: 0.3rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.service-card li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-teal);
    font-weight: bold;
}

.service-card span {
    display: block;
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--medium-gray);
    font-weight: 600;
    color: var(--accent-orange);
}

/* ===================================
   ABOUT SECTION
   =================================== */

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.about-text {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.about-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

/* ===================================
   PROCESS SECTION
   =================================== */

.process-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.process-step {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--light-gray);
    border-radius: var(--radius-md);
    position: relative;
}

.process-step img {
    width: 100%;
    height: 150px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
}

.step-number {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    width: 40px;
    height: 40px;
    background: var(--primary-teal);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
}

.process-step h3 {
    color: var(--primary-blue);
    margin-bottom: var(--spacing-xs);
}

/* ===================================
   STATISTICS SECTION
   =================================== */

.statistics-section {
    background: var(--gradient-primary);
    color: var(--white);
}

.statistics-section h2 {
    color: var(--white);
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.stat-card {
    text-align: center;
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

/* ===================================
   REVIEWS SECTION
   =================================== */

.review-card {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.review-card img {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
}

.review-content {
    flex: 1;
}

.review-text {
    font-style: italic;
    color: var(--dark-gray);
    margin-bottom: var(--spacing-sm);
    line-height: 1.7;
}

.review-author {
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: 0.25rem;
}

.review-date {
    font-size: 0.9rem;
    color: var(--dark-gray);
}

/* ===================================
   CTA SECTION
   =================================== */

.cta-section,
.contact-cta-section {
    background: var(--light-gray);
    text-align: center;
}

.cta-content h2 {
    color: var(--primary-blue);
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

/* ===================================
   TIMELINE (for about page)
   =================================== */

.timeline {
    position: relative;
    padding: var(--spacing-md) 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--primary-teal);
    transform: translateX(-50%);
}

.timeline-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.timeline-item:nth-child(even) {
    direction: rtl;
}

.timeline-item:nth-child(even) .timeline-content {
    direction: ltr;
}

.timeline-item img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

.timeline-content {
    background: var(--white);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.timeline-year {
    display: inline-block;
    background: var(--primary-teal);
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.timeline-content h3 {
    color: var(--primary-blue);
    margin-bottom: var(--spacing-xs);
}

/* ===================================
   TEAM SECTION
   =================================== */

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.team-card {
    background: var(--white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-smooth);
}

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

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

.team-card h3 {
    color: var(--primary-blue);
    padding: var(--spacing-sm);
    padding-bottom: 0.5rem;
}

.team-card p {
    padding: 0 var(--spacing-sm) var(--spacing-sm);
    color: var(--dark-gray);
}

/* ===================================
   PRODUCTS PAGE
   =================================== */

.product-detailed {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.product-images .main-image {
    width: 100%;
    height: 400px;
    object-fit: cover;
}

.product-thumbs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    padding: 0.5rem;
}

.product-thumbs img {
    width: 100%;
    height: 150px;
    object-fit: cover;
    border-radius: var(--radius-sm);
}

.product-info {
    padding: var(--spacing-md);
}

.product-info h3 {
    color: var(--primary-blue);
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.product-specs-table table {
    width: 100%;
    margin: var(--spacing-sm) 0;
    border-collapse: collapse;
}

.product-specs-table td {
    padding: 0.5rem;
    border-bottom: 1px solid var(--medium-gray);
}

.product-specs-table td:first-child {
    font-weight: 600;
    color: var(--primary-blue);
}

.product-applications ul {
    list-style: none;
    padding: 0;
}

.product-applications li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.product-applications li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary-teal);
}

/* ===================================
   SOLUTIONS PAGE
   =================================== */

.solution-section {
    padding: var(--spacing-lg) 0;
}

.solution-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--spacing-lg);
    align-items: start;
}

.solution-content.reverse {
    grid-template-columns: 1fr 1.5fr;
}

.solution-text h2 {
    color: var(--primary-blue);
    font-size: 2.5rem;
    margin-bottom: var(--spacing-xs);
}

.solution-text h3 {
    color: var(--primary-teal);
    font-size: 1.5rem;
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
}

.solution-text p,
.solution-text ul {
    margin-bottom: var(--spacing-sm);
    line-height: 1.7;
}

.solution-images {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.solution-images img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

.custom-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.custom-card {
    background: var(--white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.custom-card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
}

.custom-card h3 {
    color: var(--primary-blue);
    padding: var(--spacing-sm);
    padding-bottom: 0.5rem;
}

.custom-card p {
    padding: 0 var(--spacing-sm) var(--spacing-sm);
    color: var(--dark-gray);
}

/* ===================================
   FAQ PAGE
   =================================== */

.faq-list {
    max-width: 900px;
    margin: var(--spacing-lg) auto;
}

.faq-item {
    background: var(--white);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-smooth);
}

.faq-item:hover {
    box-shadow: var(--shadow-md);
}

.faq-item h3 {
    color: var(--primary-blue);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    cursor: pointer;
}

.faq-answer {
    color: var(--dark-gray);
    line-height: 1.7;
}

/* ===================================
   RESOURCES SECTION (FAQ)
   =================================== */

.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.resource-item {
    background: var(--white);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-smooth);
}

.resource-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.resource-item h3 {
    color: var(--primary-blue);
    margin-bottom: var(--spacing-xs);
}

.resource-item p {
    color: var(--dark-gray);
    line-height: 1.6;
}

/* ===================================
   CONTACT PAGE
   =================================== */

.contact-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.contact-method {
    background: var(--white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

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

.method-content {
    padding: var(--spacing-md);
}

.method-content h3 {
    color: var(--primary-blue);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.contact-value {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-teal);
    margin-bottom: var(--spacing-xs);
}

.contact-hours {
    font-weight: 600;
    color: var(--dark-gray);
    margin-bottom: var(--spacing-sm);
}

/* ===================================
   CONTACT FORM
   =================================== */

.form-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.form-info {
    background: var(--light-gray);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
}

.form-info h2 {
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
}

.form-benefits {
    margin-top: var(--spacing-md);
}

.form-benefits h3 {
    color: var(--primary-teal);
    margin-bottom: var(--spacing-sm);
}

.form-benefits ul {
    list-style: none;
    padding: 0;
}

.form-benefits li {
    padding: 0.75rem 0;
    padding-left: 1.5rem;
    position: relative;
    line-height: 1.6;
}

.form-benefits li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-teal);
    font-weight: bold;
    font-size: 1.25rem;
}

.form-container {
    background: var(--white);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

.form-group {
    margin-bottom: var(--spacing-sm);
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--primary-blue);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--medium-gray);
    border-radius: var(--radius-sm);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: var(--transition-smooth);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-teal);
    box-shadow: 0 0 0 3px rgba(44, 122, 123, 0.1);
}

.checkbox-group {
    display: flex;
    align-items: flex-start;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: auto;
    margin-top: 0.25rem;
    cursor: pointer;
}

.checkbox-label span {
    line-height: 1.5;
}

.submit-btn {
    width: 100%;
    padding: 1rem;
    background: var(--gradient-primary);
    color: var(--white);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-smooth);
    margin-top: var(--spacing-sm);
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.form-note {
    font-size: 0.875rem;
    color: var(--dark-gray);
    margin-top: var(--spacing-sm);
    text-align: center;
}

/* ===================================
   FOOTER
   =================================== */

.site-footer {
    background: var(--primary-dark);
    color: var(--white);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-column h3,
.footer-column h4 {
    margin-bottom: var(--spacing-sm);
    color: var(--accent-gold);
}

.footer-column p {
    opacity: 0.9;
    line-height: 1.7;
}

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

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

.footer-column a {
    opacity: 0.9;
    transition: var(--transition-smooth);
}

.footer-column a:hover {
    opacity: 1;
    color: var(--accent-gold);
}

.contact-info li {
    padding-left: 0;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: var(--spacing-md);
    text-align: center;
}

.footer-bottom p {
    opacity: 0.8;
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

/* ===================================
   POLICIES CONTAINER
   =================================== */

.policies-container {
    max-width: 900px;
    margin: var(--spacing-xl) auto;
    padding: var(--spacing-md);
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    min-height: 400px;
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */

@media (max-width: 968px) {
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .page-hero h1 {
        font-size: 2rem;
    }
    
    .about-content,
    .product-detailed,
    .solution-content,
    .form-wrapper {
        grid-template-columns: 1fr;
    }
    
    .solution-content.reverse {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .timeline::before {
        left: 30px;
    }
    
    .timeline-item {
        grid-template-columns: 1fr;
        padding-left: 60px;
    }
    
    .timeline-item:nth-child(even) {
        direction: ltr;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-xl: 3rem;
        --spacing-lg: 2rem;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .main-nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        box-shadow: var(--shadow-md);
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-smooth);
    }
    
    .main-nav.active {
        max-height: 500px;
    }
    
    .main-nav ul {
        flex-direction: column;
        padding: var(--spacing-sm) 0;
        gap: 0;
    }
    
    .main-nav li {
        border-bottom: 1px solid var(--medium-gray);
    }
    
    .main-nav a {
        display: block;
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .hero-section {
        min-height: 400px;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .hero-content p {
        font-size: 1rem;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero-content h1 {
        font-size: 1.75rem;
    }
    
    .section-header h2 {
        font-size: 1.75rem;
    }
}