/* ===== CSS RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* CSS Custom Properties for consistent color scheme */
:root {
    /* Main Colors */
    --primary-white: #ffffff;
    --secondary-gray: #f8f9fa;
    --accent-gray: #6c757d;
    --dark-gray: #343a40;
    --primary-blue: #007bff;
    --secondary-blue: #0056b3;
    --light-blue: #e3f2fd;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    /* Border Radius */
    --border-radius: 8px;
    --border-radius-lg: 12px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition: all 0.3s ease;
}

/* Base HTML and Body Styles */
html {
    scroll-behavior: smooth;
}

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

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
    color: var(--dark-gray);
}

h1 {
    font-size: 3rem;
    font-weight: 700;
}

h2 {
    font-size: 2.5rem;
}

h3 {
    font-size: 1.75rem;
}

h4 {
    font-size: 1.5rem;
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--accent-gray);
}

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

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

.section-title {
    margin-bottom: var(--spacing-sm);
    color: var(--dark-gray);
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--accent-gray);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 1rem;
    text-align: center;
}

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

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

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

.btn-secondary:hover {
    background-color: var(--primary-blue);
    color: var(--primary-white);
    transform: translateY(-2px);
}

/* ===== NAVIGATION ===== */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: var(--primary-white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition);
}

.navbar {
    padding: var(--spacing-sm) 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo h2 {
    color: var(--primary-blue);
    font-weight: 700;
    margin: 0;
    font-size: 1.5rem;
    line-height: 1.2;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    margin: 0;
    padding: 0;
}

.nav-link {
    text-decoration: none;
    color: var(--dark-gray);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
    white-space: nowrap;
    padding: var(--spacing-xs) 0;
}

.nav-link:hover {
    color: var(--primary-blue);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-blue);
    transition: var(--transition);
}

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

.nav-link.active {
    color: var(--primary-blue);
}

.nav-link.active::after {
    width: 100%;
}

/* Mobile Navigation */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background-color: var(--dark-gray);
    margin: 3px 0;
    transition: var(--transition);
}

/* ===== HERO SECTION ===== */
.hero {
    padding: 120px 0 var(--spacing-xxl);
    background: linear-gradient(135deg, var(--primary-white) 0%, var(--secondary-gray) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--dark-gray);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--accent-gray);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-visual {
    position: relative;
    width: 400px;
    height: 400px;
}

.molecule-animation {
    position: relative;
    width: 100%;
    height: 100%;
}

.molecule {
    position: absolute;
    width: 20px;
    height: 20px;
    background-color: var(--primary-blue);
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
}

.molecule:nth-child(1) {
    top: 20%;
    left: 20%;
    animation-delay: 0s;
}

.molecule:nth-child(2) {
    top: 60%;
    right: 30%;
    animation-delay: 2s;
}

.molecule:nth-child(3) {
    bottom: 20%;
    left: 40%;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px) rotate(0deg);
    }
    50% {
        transform: translateY(-20px) rotate(180deg);
    }
}

/* ===== ABOUT SECTION ===== */
.about {
    padding: var(--spacing-xxl) 0;
    background-color: var(--primary-white);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
}

.about-text h3 {
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-lg);
    background-color: var(--secondary-gray);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.stat-item h4 {
    font-size: 2.5rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-xs);
}

.stat-item p {
    color: var(--accent-gray);
    font-weight: 500;
}

/* ===== RESEARCH SECTION ===== */
.research {
    padding: var(--spacing-xxl) 0;
    background-color: var(--secondary-gray);
}

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

.research-card {
    background-color: var(--primary-white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    text-align: center;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.research-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.card-icon {
    width: 80px;
    height: 80px;
    background-color: var(--light-blue);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    transition: var(--transition);
}

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

.card-icon i {
    font-size: 2rem;
    color: var(--primary-blue);
    transition: var(--transition);
}

.research-card:hover .card-icon i {
    color: var(--primary-white);
}

.research-card h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--dark-gray);
}

.research-card p {
    color: var(--accent-gray);
    line-height: 1.6;
}

/* ===== SERVICES SECTION ===== */
.products {
    padding: var(--spacing-xxl) 0;
    background-color: var(--primary-white);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

/* Additional styling for services section */
.products-grid .product-card:nth-child(odd) {
    border-left: 4px solid var(--primary-blue);
}

.products-grid .product-card:nth-child(even) {
    border-left: 4px solid var(--secondary-blue);
}

.product-card {
    background-color: var(--primary-white);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.product-image {
    height: 200px;
    background-color: var(--light-blue);
    display: flex;
    align-items: center;
    justify-content: center;
}

.image-placeholder {
    text-align: center;
    color: var(--primary-blue);
}

.image-placeholder i {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.image-placeholder p {
    color: var(--accent-gray);
    font-weight: 500;
}

.product-content {
    padding: var(--spacing-lg);
}

.product-content h3 {
    color: var(--dark-gray);
    margin-bottom: var(--spacing-sm);
}

.product-content p {
    color: var(--accent-gray);
    margin-bottom: var(--spacing-md);
}

.learn-more {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: var(--transition);
}

.learn-more:hover {
    color: var(--secondary-blue);
    transform: translateX(5px);
}

/* ===== EXPERIENCE SECTION ===== */
.careers {
    padding: var(--spacing-xxl) 0;
    background-color: var(--secondary-gray);
}

.careers-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
}

.careers-text h3 {
    color: var(--primary-blue);
    margin-bottom: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.benefits-list {
    list-style: none;
    margin-bottom: var(--spacing-xl);
}

.benefits-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    color: var(--accent-gray);
}

.benefits-list i {
    color: var(--primary-blue);
    font-size: 1.1rem;
}

/* ===== CONTACT SECTION ===== */
.contact {
    padding: var(--spacing-xxl) 0;
    background-color: var(--primary-white);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

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

.contact-icon {
    width: 50px;
    height: 50px;
    background-color: var(--light-blue);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon i {
    color: var(--primary-blue);
    font-size: 1.2rem;
}

.contact-details h4 {
    color: var(--dark-gray);
    margin-bottom: var(--spacing-xs);
}

.contact-details p {
    color: var(--accent-gray);
    margin: 0;
}

/* Contact Form */
.contact-form {
    background-color: var(--secondary-gray);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm);
    border: 2px solid transparent;
    border-radius: var(--border-radius);
    font-family: var(--font-family);
    font-size: 1rem;
    transition: var(--transition);
    background-color: var(--primary-white);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* ===== FOOTER ===== */
.footer {
    background-color: var(--dark-gray);
    color: var(--primary-white);
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
}

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

.footer-section h3,
.footer-section h4 {
    color: var(--primary-white);
    margin-bottom: var(--spacing-md);
}

.footer-section p {
    color: #adb5bd;
    margin-bottom: var(--spacing-md);
}

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

.footer-section ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-section ul li a {
    color: #adb5bd;
    text-decoration: none;
    transition: var(--transition);
}

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

.social-links {
    display: flex;
    gap: var(--spacing-sm);
}

.social-links a {
    width: 40px;
    height: 40px;
    background-color: var(--accent-gray);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-white);
    text-decoration: none;
    transition: var(--transition);
}

.social-links a:hover {
    background-color: var(--primary-blue);
    transform: translateY(-2px);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--accent-gray);
}

.footer-bottom p {
    color: #adb5bd;
    margin: 0;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    /* Typography adjustments for mobile */
    h1 {
        font-size: 2.5rem;
    }
    
    h2 {
        font-size: 2rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    /* Navigation mobile styles */
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--primary-white);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-md);
        padding: var(--spacing-lg) 0;
        z-index: 999;
        max-height: calc(100vh - 70px);
        overflow-y: auto;
        border-top: 1px solid var(--secondary-gray);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu .nav-item {
        margin: var(--spacing-sm) 0;
    }
    
    .nav-menu .nav-link {
        display: block;
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: 1.1rem;
        border-bottom: 1px solid var(--secondary-gray);
    }
    
    .nav-menu .nav-link:last-child {
        border-bottom: none;
    }
    
    .hamburger {
        display: flex;
        position: relative;
        z-index: 1001;
        margin-left: auto;
    }
    
    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    
    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
    
    /* Ensure consistent header height and spacing */
    .header {
        height: 70px;
    }
    
    .navbar {
        height: 70px;
        padding: 0;
    }
    
    .nav-container {
        height: 100%;
        align-items: center;
        padding: 0 var(--spacing-md);
        justify-content: space-between;
    }
    
    .nav-logo h2 {
        font-size: 1.2rem;
        line-height: 1.2;
        flex-shrink: 0;
    }
    
    /* Page header mobile - account for fixed header */
    .page-header {
        padding: 100px 0 var(--spacing-lg);
        margin-top: 70px;
        min-height: calc(100vh - 70px);
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    /* Hero section mobile */
    .hero {
        padding: 100px 0 var(--spacing-xl);
        margin-top: 70px;
        min-height: calc(100vh - 70px);
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-lg);
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-visual {
        width: 300px;
        height: 300px;
    }
    
    /* About section mobile */
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    /* Careers section mobile */
    .careers-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    /* Contact section mobile */
    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    /* Products grid mobile */
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    /* Footer mobile */
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .social-links {
        justify-content: center;
    }
    
    /* Ensure all sections have proper top spacing - only for mobile */
    .about,
    .research,
    .products,
    .careers,
    .contact,
    .case-studies-overview,
    .publications-overview,
    .services-overview {
        padding-top: var(--spacing-xxl);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero {
        padding: 80px 0 var(--spacing-xl);
        margin-top: 70px;
    }
    
    .page-header {
        padding: 80px 0 var(--spacing-lg);
        margin-top: 70px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 250px;
    }
    
    /* Ensure hamburger menu is properly positioned on very small screens */
    .nav-container {
        padding: 0 var(--spacing-sm);
    }
    
    .hamburger {
        margin-right: 0;
    }
    
    /* Adjust page header for very small screens */
    .page-header h1 {
        font-size: 2.2rem;
    }
    
    .page-header p {
        font-size: 1rem;
    }
}

/* ===== PAGE HEADER ===== */
.page-header {
    padding: 120px 0 var(--spacing-xl);
    background: linear-gradient(135deg, var(--primary-white) 0%, var(--secondary-gray) 100%);
    text-align: center;
    margin-top: 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.page-header h1 {
    font-size: 3rem;
    color: var(--dark-gray);
    margin-bottom: var(--spacing-md);
}

.page-header p {
    font-size: 1.2rem;
    color: var(--accent-gray);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== SERVICES PAGE ===== */
.services-overview {
    padding: var(--spacing-xxl) 0;
    background-color: var(--primary-white);
}

.service-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.service-category {
    background-color: var(--primary-white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border-left: 4px solid var(--primary-blue);
}

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

.category-icon {
    width: 80px;
    height: 80px;
    background-color: var(--light-blue);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

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

.service-category h3 {
    color: var(--dark-gray);
    margin-bottom: var(--spacing-sm);
}

.service-category p {
    color: var(--accent-gray);
    margin-bottom: var(--spacing-lg);
}

.service-category ul {
    list-style: none;
    padding: 0;
}

.service-category ul li {
    padding: var(--spacing-xs) 0;
    color: var(--accent-gray);
    position: relative;
    padding-left: var(--spacing-md);
}

.service-category ul li::before {
    content: '•';
    color: var(--primary-blue);
    position: absolute;
    left: 0;
    font-weight: bold;
}

/* ===== SERVICE PROCESS ===== */
.service-process {
    padding: var(--spacing-xxl) 0;
    background-color: var(--secondary-gray);
}

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

.process-step {
    text-align: center;
    padding: var(--spacing-lg);
    background-color: var(--primary-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.process-step:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.step-number {
    width: 60px;
    height: 60px;
    background-color: var(--primary-blue);
    color: var(--primary-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    margin: 0 auto var(--spacing-md);
}

.process-step h3 {
    color: var(--dark-gray);
    margin-bottom: var(--spacing-sm);
}

.process-step p {
    color: var(--accent-gray);
}

/* ===== CASE STUDIES PAGE ===== */
.case-studies-overview {
    padding: var(--spacing-xxl) 0;
    background-color: var(--primary-white);
}

.case-study-filters {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.filter-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 2px solid var(--primary-blue);
    background-color: transparent;
    color: var(--primary-blue);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

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

.case-studies-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-lg);
}

.case-study-card {
    background-color: var(--primary-white);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.case-study-image {
    height: 200px;
    background-color: var(--light-blue);
    display: flex;
    align-items: center;
    justify-content: center;
}

.case-study-content {
    padding: var(--spacing-lg);
}

.case-study-category {
    display: inline-block;
    background-color: var(--light-blue);
    color: var(--primary-blue);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.case-study-content h3 {
    color: var(--dark-gray);
    margin-bottom: var(--spacing-sm);
}

.case-study-content p {
    color: var(--accent-gray);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.case-study-details {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.case-study-details span {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--accent-gray);
    font-size: 0.9rem;
}

.case-study-details i {
    color: var(--primary-blue);
}

/* ===== CTA SECTION ===== */
.cta-section {
    padding: var(--spacing-xxl) 0;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    color: var(--primary-white);
    text-align: center;
}

.cta-content h2 {
    color: var(--primary-white);
    margin-bottom: var(--spacing-md);
}

.cta-content p {
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-lg);
    font-size: 1.1rem;
}

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

.cta-section .btn-primary:hover {
    background-color: transparent;
    color: var(--primary-white);
}

/* ===== PUBLICATIONS PAGE ===== */
.publications-overview {
    padding: var(--spacing-xxl) 0;
    background-color: var(--primary-white);
}

.publication-filters {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.publications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: var(--spacing-lg);
}

.publication-card {
    background-color: var(--primary-white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border-left: 4px solid var(--primary-blue);
}

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

.publication-category {
    display: inline-block;
    background-color: var(--light-blue);
    color: var(--primary-blue);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.publication-content h3 {
    color: var(--dark-gray);
    margin-bottom: var(--spacing-sm);
    font-size: 1.1rem;
    line-height: 1.4;
}

.publication-content .authors {
    color: var(--accent-gray);
    font-style: italic;
    margin-bottom: var(--spacing-xs);
}

.publication-content .journal {
    color: var(--primary-blue);
    font-weight: 500;
    margin-bottom: var(--spacing-md);
}

.publication-details {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.publication-details span {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--accent-gray);
    font-size: 0.9rem;
}

.publication-details i {
    color: var(--primary-blue);
}

.publication-details a {
    color: var(--primary-blue);
    text-decoration: none;
    transition: var(--transition);
}

.publication-details a:hover {
    color: var(--secondary-blue);
}

/* ===== BOOKS SECTION ===== */
.books-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--secondary-gray);
}

.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.book-card {
    background-color: var(--primary-white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
}

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

.book-cover {
    width: 80px;
    height: 100px;
    background-color: var(--light-blue);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

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

.book-content h3 {
    color: var(--dark-gray);
    margin-bottom: var(--spacing-sm);
    font-size: 1.1rem;
    line-height: 1.4;
}

.book-content .authors {
    color: var(--accent-gray);
    font-style: italic;
    margin-bottom: var(--spacing-xs);
}

.book-content .publisher {
    color: var(--primary-blue);
    font-weight: 500;
    font-size: 0.9rem;
}

/* ===== ANIMATIONS & EFFECTS ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* Smooth scrolling for anchor links */
html {
    scroll-behavior: smooth;
}

/* Focus styles for accessibility */
button:focus,
input:focus,
textarea:focus,
a:focus {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

/* Loading animation for images */
.image-placeholder {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
    100% {
        opacity: 1;
    }
}