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

:root {
    --primary-color: #2563eb;
    --secondary-color: #7c3aed;
    --accent-color: #06b6d4;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

html {
    scroll-behavior: smooth;
}

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all 0.3s ease;
}

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

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-dark);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    transition: width 0.3s ease;
}

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

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

/* Language Toggle */
.lang-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: transparent;
    border: 2px solid var(--primary-color);
    border-radius: 2rem;
    padding: 0.5rem 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: 'Inter', sans-serif;
    font-weight: 500;
}

.lang-toggle:hover {
    background: rgba(37, 99, 235, 0.05);
    transform: translateY(-2px);
}

.lang-option {
    color: var(--text-light);
    transition: all 0.3s ease;
    font-size: 0.875rem;
    cursor: pointer;
}

.lang-option.active {
    color: var(--primary-color);
    font-weight: 600;
}

.lang-divider {
    color: var(--border-color);
    font-size: 0.875rem;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background: linear-gradient(135deg, var(--bg-light) 0%, #e0e7ff 100%);
    position: relative;
    padding-top: 80px;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.hero-content {
    text-align: center;
    animation: fadeInUp 1s ease;
}

.profile-image-container {
    position: relative;
    display: inline-block;
    margin-bottom: 2rem;
}

.profile-image {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    object-fit: cover;
    border: 5px solid var(--bg-white);
    box-shadow: var(--shadow-xl);
    animation: float 3s ease-in-out infinite;
}

.profile-ring {
    position: absolute;
    top: -10px;
    left: -10px;
    right: -10px;
    bottom: -10px;
    border-radius: 50%;
    border: 2px solid var(--primary-color);
    opacity: 0.3;
    animation: pulse 2s ease-in-out infinite;
}

.wave {
    display: inline-block;
    animation: wave 2s ease-in-out infinite;
}

@keyframes wave {
    0%, 100% { transform: rotate(0deg); }
    25% { transform: rotate(20deg); }
    75% { transform: rotate(-20deg); }
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.3; }
    50% { transform: scale(1.1); opacity: 0.1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-light);
    margin-bottom: 1rem;
    font-weight: 500;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto 2rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 2rem;
}

.btn {
    padding: 0.875rem 2rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: var(--shadow-md);
}

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

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

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

.social-links {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.social-link {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--bg-white);
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-size: 1.25rem;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.social-link:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

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

.mouse {
    width: 24px;
    height: 40px;
    border: 2px solid var(--primary-color);
    border-radius: 20px;
    position: relative;
    animation: scroll 2s ease-in-out infinite;
}

.mouse::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--primary-color);
    border-radius: 2px;
    animation: scroll-wheel 2s ease-in-out infinite;
}

@keyframes scroll {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 1; }
}

@keyframes scroll-wheel {
    0% { transform: translateX(-50%) translateY(0); opacity: 1; }
    100% { transform: translateX(-50%) translateY(16px); opacity: 0; }
}

/* Section Styles */
.section {
    padding: 5rem 2rem;
}

.section:nth-child(even) {
    background: var(--bg-light);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-dark);
    position: relative;
    display: inline-block;
    width: 100%;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

/* About Section */
.about-section {
    background: var(--bg-white);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
}

.about-text p {
    font-size: 1.125rem;
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.highlight {
    color: var(--primary-color);
    font-weight: 600;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.stat-card {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 1rem;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

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

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 1rem;
    color: var(--text-light);
    margin-top: 0.5rem;
}

/* Ventures Section */
.ventures-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.venture-card {
    background: var(--bg-white);
    padding: 2.5rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.venture-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

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

.venture-card h3 {
    font-size: 1.75rem;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.venture-role {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 1rem;
}

.venture-description {
    color: var(--text-light);
    margin-bottom: 1rem;
    line-height: 1.8;
}

.venture-highlights {
    list-style: none;
    padding: 0;
}

.venture-highlights li {
    padding: 0.5rem 0;
    color: var(--text-light);
    position: relative;
    padding-left: 1.5rem;
}

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

.venture-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1.5rem;
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    text-decoration: none;
    border-radius: 0.5rem;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}

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

.venture-link i {
    font-size: 0.875rem;
}

/* Research Section */
.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.research-card {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 1rem;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.research-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.research-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    transition: all 0.3s ease;
}

.research-card:hover .research-icon {
    color: white;
    transform: scale(1.1);
}

.research-card h4 {
    font-size: 1.125rem;
    color: var(--text-dark);
    transition: all 0.3s ease;
}

.research-card:hover h4 {
    color: white;
}

/* Publications Section */
.publications-list {
    display: grid;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.publication-card {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    border-left: 4px solid var(--primary-color);
}

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

.pub-badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.publication-card h4 {
    font-size: 1.25rem;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.pub-authors {
    color: var(--text-light);
    font-size: 0.95rem;
}

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

/* Contact Section */
.contact-content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.contact-text {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    font-size: 1.125rem;
}

.contact-item i {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.contact-item a {
    color: var(--text-dark);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* Footer */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 2rem;
    text-align: center;
}

.footer-links {
    display: flex;
    gap: 2rem;
    justify-content: center;
    margin-top: 1rem;
}

.footer-links a {
    color: white;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--accent-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        padding: 1rem;
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .nav-logo {
        font-size: 1rem;
    }

    .nav-menu {
        gap: 0.75rem;
        font-size: 0.8rem;
    }

    .lang-toggle {
        padding: 0.4rem 0.75rem;
        font-size: 0.75rem;
    }

    .lang-option {
        font-size: 0.75rem;
    }

    .hero {
        padding-top: 60px;
    }

    .hero-container {
        padding: 1rem;
    }

    .profile-image {
        width: 140px;
        height: 140px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.125rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .section {
        padding: 3rem 1rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .about-text p {
        font-size: 1rem;
    }

    .ventures-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .venture-card {
        padding: 1.5rem;
    }

    .research-grid {
        grid-template-columns: 1fr;
    }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

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

    .stat-card {
        padding: 1.5rem;
    }

    .stat-number {
        font-size: 2.5rem;
    }

    .contact-info {
        gap: 1rem;
    }

    .contact-item {
        font-size: 1rem;
    }

    .footer-links {
        gap: 1rem;
        flex-wrap: wrap;
    }
}

@media (max-width: 480px) {
    .nav-menu {
        gap: 0.5rem;
        font-size: 0.75rem;
    }

    .hero-title {
        font-size: 1.75rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .profile-image {
        width: 120px;
        height: 120px;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .venture-card h3 {
        font-size: 1.5rem;
    }

    .publication-card {
        padding: 1.5rem;
    }

    .publication-card h4 {
        font-size: 1.125rem;
    }
}

/* Animations */
.fade-in {
    opacity: 0;
    animation: fadeIn 1s ease forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
    animation: slideInLeft 1s ease forwards;
}

@keyframes slideInLeft {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.slide-in-right {
    opacity: 0;
    transform: translateX(50px);
    animation: slideInRight 1s ease forwards;
}

@keyframes slideInRight {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}