/* ===== CSS Variables ===== */
:root {
    --primary-color: #1a365d;
    --primary-light: #2c5282;
    --primary-dark: #0f2544;
    --secondary-color: #38a169;
    --secondary-light: #48bb78;
    --accent-color: #ed8936;
    --text-dark: #1a202c;
    --text-medium: #4a5568;
    --text-light: #718096;
    --bg-light: #f7fafc;
    --bg-white: #ffffff;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.15);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition: all 0.3s ease;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-serif: 'Playfair Display', Georgia, serif;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
}

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

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

ul, ol {
    list-style: none;
}

/* ===== Container ===== */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-dark);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: 1rem;
    color: var(--text-medium);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 1.75rem;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    gap: 0.5rem;
}

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

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

.btn-secondary {
    background: var(--secondary-color);
    color: white;
    border-color: var(--secondary-color);
}

.btn-secondary:hover {
    background: var(--secondary-light);
    border-color: var(--secondary-light);
    transform: translateY(-2px);
}

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

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

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

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

/* ===== Header & Navigation ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-img {
    width: 45px;
    height: 45px;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.75rem 1rem;
    font-size: 0.925rem;
    font-weight: 500;
    color: var(--text-dark);
    border-radius: var(--radius-sm);
}

.nav-link:hover {
    color: var(--primary-color);
    background: var(--bg-light);
}

.nav-link i {
    font-size: 0.7rem;
    transition: var(--transition);
}

.nav-item:hover .nav-link i {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    background: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 0.5rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
}

.nav-item:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li a {
    display: block;
    padding: 0.75rem 1rem;
    font-size: 0.9rem;
    color: var(--text-medium);
    border-radius: var(--radius-sm);
}

.dropdown-menu li a:hover {
    background: var(--bg-light);
    color: var(--primary-color);
}

.btn-contact {
    background: var(--primary-color);
    color: white !important;
    border-radius: var(--radius-md);
}

.btn-contact:hover {
    background: var(--primary-light) !important;
}

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

.hamburger, .hamburger::before, .hamburger::after {
    display: block;
    width: 25px;
    height: 2px;
    background: var(--text-dark);
    transition: var(--transition);
}

.hamburger {
    position: relative;
}

.hamburger::before, .hamburger::after {
    content: '';
    position: absolute;
}

.hamburger::before {
    top: -7px;
}

.hamburger::after {
    top: 7px;
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 50%, var(--primary-light) 100%);
    overflow: hidden;
    padding-top: 80px;
}

.hero-background {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.hero-particles {
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle at 20% 80%, rgba(255,255,255,0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255,255,255,0.08) 0%, transparent 40%),
        radial-gradient(circle at 40% 40%, rgba(56,161,105,0.1) 0%, transparent 30%);
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    max-width: 900px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    color: white;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-title .highlight {
    background: linear-gradient(90deg, var(--secondary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: rgba(255,255,255,0.9);
    margin-bottom: 2.5rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

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

.hero-scroll {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
}

.scroll-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: rgba(255,255,255,0.7);
    font-size: 0.85rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

/* ===== Stats Bar ===== */
.stats-bar {
    background: var(--bg-light);
    padding: 3rem 0;
    border-bottom: 1px solid var(--border-color);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    text-align: center;
}

.stat-item {
    padding: 1rem;
}

.stat-number {
    display: block;
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.95rem;
    color: var(--text-medium);
}

/* ===== Section Styles ===== */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title {
    margin-bottom: 1rem;
    color: var(--text-dark);
}

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

.section-tag {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(26, 54, 93, 0.1);
    color: var(--primary-color);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: var(--radius-xl);
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.section-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
    font-weight: 500;
}

.section-link:hover {
    gap: 0.75rem;
}

/* ===== Research Pillars ===== */
.pillars-section {
    padding: 5rem 0;
    background: var(--bg-white);
}

.pillars-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.pillar-card {
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: var(--transition);
}

.pillar-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.pillar-card.featured {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border: none;
}

.pillar-card.featured * {
    color: white;
}

.pillar-card.featured .pillar-icon {
    background: rgba(255,255,255,0.2);
}

.pillar-card.featured .pillar-features li::before {
    color: var(--secondary-light);
}

.pillar-icon {
    width: 70px;
    height: 70px;
    background: var(--bg-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.pillar-icon i {
    font-size: 1.75rem;
    color: var(--primary-color);
}

.pillar-card.featured .pillar-icon i {
    color: white;
}

.pillar-title {
    margin-bottom: 1rem;
}

.pillar-description {
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.pillar-features {
    margin-bottom: 1.5rem;
}

.pillar-features li {
    padding: 0.5rem 0;
    font-size: 0.9rem;
    color: var(--text-medium);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.pillar-features li::before {
    content: '✓';
    color: var(--secondary-color);
    font-weight: bold;
}

.pillar-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
    font-weight: 500;
    font-size: 0.95rem;
}

.pillar-card.featured .pillar-link {
    color: white;
}

.pillar-link:hover {
    gap: 0.75rem;
}

/* ===== About Preview Section ===== */
.about-preview {
    padding: 5rem 0;
    background: var(--bg-light);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-content .section-title {
    text-align: left;
}

.about-text {
    font-size: 1.05rem;
    line-height: 1.8;
}

.about-features {
    margin: 2rem 0;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 0;
    font-size: 1rem;
    color: var(--text-dark);
}

.feature-item i {
    color: var(--secondary-color);
    font-size: 1.25rem;
}

.about-image {
    position: relative;
}

.image-wrapper {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.image-wrapper img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    background: linear-gradient(135deg, var(--primary-light), var(--secondary-color));
}

.about-stats {
    position: absolute;
    bottom: -30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 1rem;
}

.mini-stat {
    background: white;
    padding: 1.25rem 2rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    text-align: center;
}

.mini-stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.mini-stat-label {
    font-size: 0.85rem;
    color: var(--text-medium);
}

/* ===== News Section ===== */
.news-section {
    padding: 5rem 0;
    background: var(--bg-white);
}

.news-section .section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-align: left;
}

.news-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 2rem;
}

.news-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.news-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.news-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.news-category {
    position: absolute;
    top: 1rem;
    left: 1rem;
    padding: 0.35rem 0.75rem;
    background: var(--primary-color);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
}

.news-content {
    padding: 1.5rem;
}

.news-date {
    display: block;
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.news-title {
    font-size: 1.15rem;
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.news-excerpt {
    font-size: 0.9rem;
    color: var(--text-medium);
    margin-bottom: 1rem;
}

.news-link {
    color: var(--primary-color);
    font-weight: 500;
    font-size: 0.9rem;
}

.news-link:hover {
    color: var(--primary-light);
}

/* ===== Partners Section ===== */
.partners-section {
    padding: 4rem 0;
    background: var(--bg-light);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.partners-grid {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 4rem;
    flex-wrap: wrap;
}

.partner-logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    opacity: 0.7;
    transition: var(--transition);
}

.partner-logo:hover {
    opacity: 1;
}

.partner-logo img {
    height: 60px;
    width: auto;
    object-fit: contain;
    filter: grayscale(100%);
    transition: var(--transition);
}

.partner-logo:hover img {
    filter: grayscale(0%);
}

.partner-logo span {
    font-size: 0.85rem;
    color: var(--text-medium);
    text-align: center;
}

.partner-logo small {
    font-size: 0.75rem;
    color: var(--text-light);
}

.partner-placeholder {
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.partner-placeholder i {
    font-size: 2.5rem;
    color: var(--primary-color);
    opacity: 0.5;
}

.partner-logo:hover .partner-placeholder i {
    opacity: 1;
}

/* ===== CTA Section ===== */
.cta-section {
    padding: 5rem 0;
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(255,255,255,0.1) 0%, transparent 40%),
        radial-gradient(circle at 80% 50%, rgba(56,161,105,0.1) 0%, transparent 40%);
}

.cta-content {
    position: relative;
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.cta-title {
    font-size: 2.25rem;
    color: white;
    margin-bottom: 1rem;
}

.cta-text {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.9);
    margin-bottom: 2rem;
}

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

/* ===== Footer ===== */
.footer {
    background: var(--text-dark);
    color: white;
    padding-top: 4rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
    gap: 3rem;
    padding-bottom: 3rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.footer-logo img {
    height: 40px;
    width: auto;
}

.footer-logo span {
    font-size: 1.5rem;
    font-weight: 700;
}

.footer-description {
    color: rgba(255,255,255,0.7);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

.footer-social {
    display: flex;
    gap: 1rem;
}

.footer-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    color: white;
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
}

.footer-links h4,
.footer-contact h4 {
    font-size: 1rem;
    margin-bottom: 1.5rem;
    color: white;
}

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

.footer-links a {
    color: rgba(255,255,255,0.7);
    font-size: 0.95rem;
}

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

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact-item strong {
    display: block;
    color: white;
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

.contact-item p,
.contact-item a {
    color: rgba(255,255,255,0.7);
    font-size: 0.9rem;
    line-height: 1.6;
}

.contact-item a:hover {
    color: var(--secondary-color);
}

.footer-bottom {
    padding: 2rem 0;
}

.footer-institutions {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 3rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-institutions img {
    height: 35px;
    width: auto;
    opacity: 0.7;
    filter: brightness(0) invert(1);
}

.footer-legal {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-legal p {
    color: rgba(255,255,255,0.6);
    font-size: 0.85rem;
    margin: 0;
}

.legal-links {
    display: flex;
    gap: 1.5rem;
}

.legal-links a {
    color: rgba(255,255,255,0.6);
    font-size: 0.85rem;
}

.legal-links a:hover {
    color: white;
}

/* ===== Newsletter Popup ===== */
.newsletter-popup {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.popup-content {
    background: white;
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    max-width: 450px;
    width: 90%;
    text-align: center;
    position: relative;
}

.popup-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-light);
}

.popup-content h3 {
    margin-bottom: 0.75rem;
}

.popup-content p {
    margin-bottom: 1.5rem;
}

.newsletter-form {
    display: flex;
    gap: 0.5rem;
}

.newsletter-form input {
    flex: 1;
    padding: 0.875rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
}

.newsletter-form input:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* ===== Page Header (for inner pages) ===== */
.page-header {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    padding: 8rem 0 4rem;
    text-align: center;
}

.page-header h1 {
    color: white;
    margin-bottom: 1rem;
}

.page-header p {
    color: rgba(255,255,255,0.9);
    max-width: 600px;
    margin: 0 auto;
}

.breadcrumb {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.breadcrumb a {
    color: rgba(255,255,255,0.7);
}

.breadcrumb a:hover {
    color: white;
}

.breadcrumb span {
    color: rgba(255,255,255,0.5);
}

/* ===== Content Sections ===== */
.content-section {
    padding: 4rem 0;
}

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

.content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.content-grid.reverse {
    direction: rtl;
}

.content-grid.reverse > * {
    direction: ltr;
}

/* ===== Team/People Page ===== */
.team-section {
    padding: 4rem 0;
}

.team-category {
    margin-bottom: 4rem;
}

.team-category h2 {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

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

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

.team-photo {
    width: 100%;
    height: 280px;
    object-fit: cover;
    background: linear-gradient(135deg, var(--primary-light), var(--secondary-color));
}

.team-info {
    padding: 1.5rem;
}

.team-name {
    font-size: 1.2rem;
    margin-bottom: 0.25rem;
}

.team-role {
    color: var(--primary-color);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.team-location {
    color: var(--text-light);
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.35rem;
    margin-bottom: 1rem;
}

.team-bio {
    font-size: 0.9rem;
    color: var(--text-medium);
    margin-bottom: 1rem;
}

.team-links {
    display: flex;
    gap: 0.75rem;
}

.team-links a {
    width: 35px;
    height: 35px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-light);
    border-radius: 50%;
    color: var(--text-medium);
    font-size: 0.9rem;
}

.team-links a:hover {
    background: var(--primary-color);
    color: white;
}

/* ===== Publications Page ===== */
.publications-filters {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.5rem 1.25rem;
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    font-size: 0.9rem;
    color: var(--text-medium);
    cursor: pointer;
    transition: var(--transition);
}

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

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

.publication-item {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    transition: var(--transition);
}

.publication-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.publication-year {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--primary-color);
    color: white;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    margin-bottom: 0.75rem;
}

.publication-title {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.publication-authors {
    font-size: 0.9rem;
    color: var(--text-medium);
    margin-bottom: 0.5rem;
}

.publication-journal {
    font-size: 0.9rem;
    color: var(--text-light);
    font-style: italic;
}

.publication-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.publication-links a {
    font-size: 0.85rem;
    color: var(--primary-color);
    font-weight: 500;
}

/* ===== Contact Page ===== */
.contact-section {
    padding: 4rem 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 4rem;
}

.contact-info-card {
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    padding: 2rem;
    margin-bottom: 1.5rem;
}

.contact-info-card h3 {
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.contact-info-card h3 i {
    color: var(--primary-color);
}

.contact-form {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-dark);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-family: inherit;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(26, 54, 93, 0.1);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

/* ===== Opportunities/Careers Page ===== */
.opportunities-section {
    padding: 4rem 0;
}

.position-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    margin-bottom: 1.5rem;
    transition: var(--transition);
}

.position-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.position-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.position-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.position-meta {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.position-meta span {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.9rem;
    color: var(--text-medium);
}

.position-meta i {
    color: var(--primary-color);
}

.position-badge {
    padding: 0.35rem 0.75rem;
    background: var(--secondary-color);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
}

.position-description {
    margin-bottom: 1.5rem;
    color: var(--text-medium);
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
    .pillars-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .about-image {
        order: -1;
    }
    
    .news-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 2rem;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    h1 { font-size: 2.25rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.25rem; }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 1rem;
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-item {
        width: 100%;
    }
    
    .nav-link {
        justify-content: space-between;
        padding: 1rem;
    }
    
    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        padding-left: 1rem;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }
    
    .nav-item.open .dropdown-menu {
        max-height: 500px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .news-section .section-header {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
    
    .partners-grid {
        gap: 2rem;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-social {
        justify-content: center;
    }
    
    .footer-legal {
        flex-direction: column;
        text-align: center;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .position-header {
        flex-direction: column;
        gap: 1rem;
    }
    
    .content-grid {
        grid-template-columns: 1fr;
    }
    
    .content-grid.reverse {
        direction: ltr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .stat-number {
        font-size: 2.25rem;
    }
    
    .pillar-card {
        padding: 1.5rem;
    }
    
    .about-stats {
        flex-direction: column;
        width: 100%;
        padding: 0 1rem;
    }
    
    .mini-stat {
        width: 100%;
    }
    
    .cta-title {
        font-size: 1.75rem;
    }
    
    .team-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== Utility Classes ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.py-4 { padding-top: 2rem; padding-bottom: 2rem; }
.py-5 { padding-top: 3rem; padding-bottom: 3rem; }

.hidden { display: none; }
.visible { display: block; }