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

:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --accent-color: #3b82f6;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --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: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
}

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

/* 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 .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-link {
    color: var(--text-dark);
    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: var(--gradient-1);
    transition: width 0.3s ease;
}

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

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    border-radius: 3px;
    transition: all 0.3s ease;
}

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

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="%23ffffff" fill-opacity="0.1" d="M0,96L48,112C96,128,192,160,288,160C384,160,480,128,576,122.7C672,117,768,139,864,138.7C960,139,1056,117,1152,112C1248,107,1344,117,1392,122.7L1440,128L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>');
    background-size: cover;
    background-position: bottom;
}

.hero-content {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.hero-text {
    color: white;
    max-width: 800px;
    position: relative;
    z-index: 2;
}

.hero-text h1 {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.1;
}

.hero-text h2 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 1rem;
    opacity: 0.95;
}

.hero-text p {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    opacity: 0.9;
}

.social-links {
    display: flex;
    gap: 1.5rem;
    margin: 2rem 0;
}

.social-links a {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    color: white;
    font-size: 1.5rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.social-links a:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-5px);
}

.cta-button {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: white;
    color: var(--primary-color);
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-lg);
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

/* Floating Shapes */
.hero-decoration {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
    z-index: 0;
}

.floating-shape {
    position: absolute;
    border-radius: 50%;
    opacity: 0.1;
    animation: float 20s infinite ease-in-out;
}

.shape-1 {
    width: 300px;
    height: 300px;
    background: white;
    top: 10%;
    right: 10%;
    animation-delay: 0s;
}

.shape-2 {
    width: 200px;
    height: 200px;
    background: white;
    bottom: 20%;
    left: 5%;
    animation-delay: 5s;
}

.shape-3 {
    width: 150px;
    height: 150px;
    background: white;
    top: 60%;
    right: 30%;
    animation-delay: 10s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    50% {
        transform: translateY(-30px) rotate(180deg);
    }
}

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

.fade-in-delay {
    animation: fadeIn 1s ease-in 0.3s backwards;
}

.fade-in-delay-2 {
    animation: fadeIn 1s ease-in 0.6s backwards;
}

.fade-in-delay-3 {
    animation: fadeIn 1s ease-in 0.9s backwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Section Styles */
section {
    padding: 5rem 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Education Section */
.education-section {
    background: var(--bg-light);
}

.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--gradient-1);
}

.timeline-item {
    position: relative;
    padding-left: 60px;
    margin-bottom: 3rem;
}

.timeline-marker {
    position: absolute;
    left: 9px;
    top: 0;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: white;
    border: 4px solid #667eea;
    box-shadow: var(--shadow-md);
}

.timeline-content {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

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

.timeline-date {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--gradient-1);
    color: white;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.timeline-content h3 {
    font-size: 1.5rem;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.timeline-content h4 {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 1rem;
}

.timeline-content p {
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.achievements {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    margin-top: 1rem;
}

.achievement-tag {
    padding: 0.5rem 1rem;
    background: var(--bg-light);
    border: 2px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-dark);
    transition: all 0.3s ease;
}

.achievement-tag:hover {
    border-color: var(--primary-color);
    background: white;
}

/* Experience Section */
.experience-section {
    background: white;
}

.experience-grid {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.experience-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow-md);
    border-left: 4px solid transparent;
    transition: all 0.3s ease;
}

.experience-card:hover {
    border-left-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
    transform: translateX(5px);
}

.exp-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.exp-header h3 {
    font-size: 1.5rem;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.exp-header h4 {
    font-size: 1.2rem;
    color: var(--primary-color);
    font-weight: 600;
}

.exp-date {
    padding: 0.5rem 1rem;
    background: var(--gradient-1);
    color: white;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    white-space: nowrap;
}

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

.exp-highlights li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-light);
    line-height: 1.7;
}

.exp-highlights li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-size: 1.2rem;
    font-weight: bold;
}

/* Publications Section */
.publications {
    background: var(--bg-light);
}

.publications-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-bottom: 3rem;
}

.publication-item {
    display: flex;
    gap: 2rem;
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    border-left: 4px solid transparent;
}

.publication-item:hover {
    border-left-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
    transform: translateX(5px);
}

.pub-year {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    min-width: 80px;
}

.pub-content h3 {
    font-size: 1.3rem;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.pub-authors {
    font-size: 0.95rem;
    color: var(--text-light);
    margin-bottom: 0.3rem;
}

.pub-venue {
    font-size: 0.9rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.pub-description {
    font-size: 1rem;
    color: var(--text-light);
    line-height: 1.6;
}

.pub-links {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.pub-link-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: var(--gradient-1);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}

.pub-link-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

/* Contact Section */
.contact {
    background: white;
}

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

.contact-content > p {
    font-size: 1.2rem;
    color: var(--text-light);
    margin-bottom: 3rem;
    line-height: 1.8;
}

.contact-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.contact-method {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem;
    background: var(--bg-light);
    border-radius: 15px;
    transition: all 0.3s ease;
}

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

.contact-method i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.contact-method h4 {
    font-size: 1.2rem;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.contact-method p {
    color: var(--text-light);
    font-size: 1rem;
}

.social-links-contact {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
}

.social-links-contact a {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-1);
    border-radius: 50%;
    color: white;
    font-size: 1.8rem;
    transition: all 0.3s ease;
}

.social-links-contact a:hover {
    transform: translateY(-5px) scale(1.1);
    box-shadow: var(--shadow-lg);
}

/* Footer */
.footer {
    background: var(--text-dark);
    color: white;
    text-align: center;
    padding: 2rem 0;
}

.footer p {
    margin: 0.5rem 0;
    opacity: 0.8;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-lg);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .hero-text h1 {
        font-size: 2.5rem;
    }

    .hero-text h2 {
        font-size: 1.5rem;
    }

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

    .timeline::before {
        left: 10px;
    }

    .timeline-item {
        padding-left: 50px;
    }

    .timeline-marker {
        left: 3px;
    }

    .exp-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .exp-date {
        align-self: flex-start;
    }

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

    .publication-item {
        flex-direction: column;
        gap: 1rem;
    }

    .pub-year {
        min-width: auto;
    }

    .contact-methods {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .hero-text h1 {
        font-size: 2rem;
    }

    .hero-text h2 {
        font-size: 1.2rem;
    }

    .social-links {
        gap: 1rem;
    }

    .social-links a {
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }

    section {
        padding: 3rem 0;
    }
}