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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: #1a1a1a;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    position: relative;
    overflow-x: hidden;
}

/* Subtle background pattern */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 25% 25%, rgba(99, 102, 241, 0.02) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(59, 130, 246, 0.02) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(248, 250, 252, 0.8);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid rgba(148, 163, 184, 0.1);
    z-index: 1000;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.nav-brand h2 {
    font-weight: 500;
    color: #1a1a1a;
    font-size: 1.1rem;
}

.nav-menu {
    display: flex;
    gap: 2.5rem;
}

.nav-link {
    text-decoration: none;
    color: #64748b;
    font-weight: 400;
    font-size: 0.95rem;
    transition: color 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.nav-link:hover {
    color: #1a1a1a;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: #3b82f6;
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 80px;
}

/* Aurora background */
.hero::before,
.hero::after {
    content: '';
    position: absolute;
    inset: -10%;
    background: radial-gradient(600px 300px at 20% 30%, rgba(99,102,241,0.15), transparent 60%),
                radial-gradient(500px 300px at 80% 70%, rgba(59,130,246,0.12), transparent 60%),
                radial-gradient(400px 250px at 50% 10%, rgba(16,185,129,0.10), transparent 60%);
    filter: blur(40px);
    z-index: 0;
    animation: auroraShift 18s ease-in-out infinite alternate;
    pointer-events: none;
}

.hero::after {
    animation-direction: alternate-reverse;
    opacity: 0.7;
}

@keyframes auroraShift {
    0%   { transform: translate3d(0, 0, 0) scale(1); }
    50%  { transform: translate3d(2%, -2%, 0) scale(1.05); }
    100% { transform: translate3d(-2%, 2%, 0) scale(1.02); }
}

/* Floating elements */
.floating-element {
    position: absolute;
    border-radius: 50%;
    background: rgba(59, 130, 246, 0.03);
    animation: float 8s ease-in-out infinite;
    pointer-events: none;
}

.element-1 {
    width: 120px;
    height: 120px;
    top: 20%;
    right: 10%;
    animation-delay: -2s;
}

.element-2 {
    width: 80px;
    height: 80px;
    bottom: 30%;
    left: 15%;
    animation-delay: -6s;
}

@keyframes float {
    0%, 100% { 
        transform: translateY(0) translateX(0) scale(1);
        opacity: 0.3;
    }
    50% { 
        transform: translateY(-20px) translateX(10px) scale(1.1);
        opacity: 0.1;
    }
}

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

.hero-content {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 6rem;
    align-items: center;
}

.hero-title {
    font-size: 4rem;
    font-weight: 300;
    line-height: 1.1;
    margin-bottom: 2rem;
    color: #1a1a1a;
}

.hero-title strong {
    font-weight: 600;
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 50%, #3b82f6 100%);
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientMove 6s ease-in-out infinite;
}

@keyframes gradientMove {
    0% { background-position: 0% center; }
    50% { background-position: 100% center; }
    100% { background-position: 0% center; }
}


.hero-description {
    font-size: 1.2rem;
    line-height: 1.7;
    margin-bottom: 3rem;
    color: #4a5568;
    font-weight: 300;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
}

.btn {
    padding: 1rem 2.5rem;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, #1a1a1a 0%, #374151 100%);
    color: white;
    box-shadow: 
        0 4px 12px rgba(26, 26, 26, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 
        0 8px 25px rgba(26, 26, 26, 0.25),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.8);
    color: #374151;
    border: 1px solid rgba(148, 163, 184, 0.2);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 
        0 2px 6px rgba(0, 0, 0, 0.02),
        inset 0 1px 0 rgba(255, 255, 255, 0.4);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(-1px);
    box-shadow: 
        0 4px 12px rgba(0, 0, 0, 0.04),
        inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

/* Profile Card */
.profile-card {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 24px;
    padding: 2.5rem;
    text-align: center;
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.04),
        0 4px 16px rgba(0, 0, 0, 0.02),
        inset 0 1px 0 rgba(255, 255, 255, 0.5);
    position: relative;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.profile-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.4), transparent);
}

.profile-card:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.06),
        0 8px 24px rgba(0, 0, 0, 0.04),
        inset 0 1px 0 rgba(255, 255, 255, 0.7);
}

.profile-avatar {
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    border: 2px solid rgba(59, 130, 246, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2rem;
    color: #64748b;
    box-shadow: 
        0 4px 12px rgba(0, 0, 0, 0.04),
        inset 0 2px 4px rgba(255, 255, 255, 0.6);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.profile-card:hover .profile-avatar {
    transform: scale(1.05);
    border-color: rgba(59, 130, 246, 0.3);
}

.profile-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.profile-info h3 {
    margin-bottom: 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    color: #64748b;
}

.profile-info p {
    margin-bottom: 1rem;
    color: #1a1a1a;
    font-size: 0.95rem;
    line-height: 1.5;
}

.profile-info strong {
    font-weight: 600;
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: #333;
}

/* Hero Interests Section */
.hero-interests {
    margin-bottom: 2.5rem;
}

.hero-interests h3 {
    font-size: 1rem;
    font-weight: 500;
    color: #64748b;
    margin-bottom: 1rem;
}

.interest-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    box-shadow: 0 2px 6px rgba(59, 130, 246, 0.2);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.tag:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

/* Experience Section */
.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: #e5e7eb;
}

.timeline-item {
    position: relative;
    margin-bottom: 2rem;
    padding-left: 4rem;
}

.timeline-marker {
    position: absolute;
    left: 22px;
    top: 8px;
    width: 16px;
    height: 16px;
    background: #0066cc;
    border-radius: 50%;
    border: 3px solid white;
    box-shadow: 0 0 0 3px #e5e7eb;
}

.timeline-content {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.timeline-header {
    margin-bottom: 1rem;
}

.timeline-header h3 {
    font-size: 1.25rem;
    color: #333;
    margin-bottom: 0.25rem;
}

.company {
    color: #0066cc;
    font-weight: 600;
    font-size: 1rem;
}

.period {
    color: #666;
    font-size: 0.875rem;
    float: right;
}

.achievements {
    list-style: none;
}

.achievements li {
    margin-bottom: 0.5rem;
    padding-left: 1rem;
    position: relative;
}

.achievements li::before {
    content: '▸';
    color: #0066cc;
    position: absolute;
    left: 0;
}

/* Publications Section */
.publications {
    background: #f8fafc;
}

.publications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.publication-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.publication-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
}

.publication-venue {
    background: #0066cc;
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    display: inline-block;
    margin-bottom: 1rem;
}

.publication-title {
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 0.75rem;
    color: #333;
}

.publication-authors {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.publication-abstract {
    color: #666;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

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

.publication-link {
    padding: 0.5rem 1rem;
    background: #f1f5f9;
    color: #0066cc;
    text-decoration: none;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.publication-link:hover {
    background: #0066cc;
    color: white;
}

/* Contact Section */
.contact {
    text-align: center;
}

.contact-content p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    color: #666;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: #f8fafc;
    color: #0066cc;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.contact-link:hover {
    background: #0066cc;
    color: white;
    transform: translateY(-2px);
}

/* Footer */
.footer {
    background: #1f2937;
    color: white;
    text-align: center;
    padding: 2rem 0;
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    width: 34px;
    height: 54px;
    border: 2px solid rgba(26, 26, 26, 0.2);
    border-radius: 24px;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    text-decoration: none;
    transition: transform 0.3s ease, border-color 0.3s ease;
    z-index: 2;
}

.scroll-indicator:hover {
    transform: translateX(-50%) translateY(-2px);
    border-color: rgba(26, 26, 26, 0.35);
}

.scroll-dot {
    width: 6px;
    height: 6px;
    background: #1a1a1a;
    border-radius: 50%;
    margin-top: 8px;
    animation: scrollBounce 1.6s ease-in-out infinite;
}

@keyframes scrollBounce {
    0%, 100% { transform: translateY(0); opacity: 0.8; }
    50% { transform: translateY(18px); opacity: 0.2; }
}

/* 3D Coin Section */
.coin-section {
    padding: 60px 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
    position: relative;
}

.coin-3d-container {
    max-width: 100%;
    margin: 0 auto;
    position: relative;
    height: 400px;
    cursor: grab;
}

.coin-3d-container:active {
    cursor: grabbing;
}

.coin-info {
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.1);
    color: #666;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    z-index: 10;
    pointer-events: none;
    transition: opacity 0.3s;
}

.coin-3d-container canvas {
    display: block;
    margin: 0 auto;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 3rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .floating-element {
        display: none;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .contact-links {
        flex-direction: column;
        align-items: center;
    }
    
    .publications-grid {
        grid-template-columns: 1fr;
    }
    
    .nav-menu {
        display: none;
    }
}