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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #ff6b81 0%, #c01c7a 100%);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Custom F1 Car Scrollbar */
/* Webkit browsers (Chrome, Safari, Edge) */
::-webkit-scrollbar {
    width: 18px;
}

::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.15);
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, #ff6b81 0%, #c01c7a 100%);
    border-radius: 10px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    position: relative;
    min-height: 50px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M18.92 6.01C18.72 5.42 18.16 5 17.5 5h-11c-.66 0-1.21.42-1.42 1.01L3 12v8c0 .55.45 1 1 1h1c.55 0 1-.45 1-1v-1h12v1c0 .55.45 1 1 1h1c.55 0 1-.45 1-1v-8l-2.08-5.99zM6.5 16c-.83 0-1.5-.67-1.5-1.5S5.67 13 6.5 13s1.5.67 1.5 1.5S7.33 16 6.5 16zm11 0c-.83 0-1.5-.67-1.5-1.5s.67-1.5 1.5-1.5 1.5.67 1.5 1.5-.67 1.5-1.5 1.5zM5 11l1.5-4.5h11L19 11H5z'/%3E%3C/svg%3E");
    background-size: 14px 14px;
    background-position: center;
    background-repeat: no-repeat;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, #ff8fa3 0%, #d6348a 100%);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M18.92 6.01C18.72 5.42 18.16 5 17.5 5h-11c-.66 0-1.21.42-1.42 1.01L3 12v8c0 .55.45 1 1 1h1c.55 0 1-.45 1-1v-1h12v1c0 .55.45 1 1 1h1c.55 0 1-.45 1-1v-8l-2.08-5.99zM6.5 16c-.83 0-1.5-.67-1.5-1.5S5.67 13 6.5 13s1.5.67 1.5 1.5S7.33 16 6.5 16zm11 0c-.83 0-1.5-.67-1.5-1.5s.67-1.5 1.5-1.5 1.5.67 1.5 1.5-.67 1.5-1.5 1.5zM5 11l1.5-4.5h11L19 11H5z'/%3E%3C/svg%3E");
    background-size: 14px 14px;
    background-position: center;
    background-repeat: no-repeat;
    box-shadow: 0 0 12px rgba(255, 107, 129, 0.6), inset 0 2px 4px rgba(0, 0, 0, 0.2);
    transform: scale(1.05);
    transition: all 0.2s ease;
}

::-webkit-scrollbar-thumb:active {
    background: linear-gradient(180deg, #e55a6f 0%, #a8165f 100%);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M18.92 6.01C18.72 5.42 18.16 5 17.5 5h-11c-.66 0-1.21.42-1.42 1.01L3 12v8c0 .55.45 1 1 1h1c.55 0 1-.45 1-1v-1h12v1c0 .55.45 1 1 1h1c.55 0 1-.45 1-1v-8l-2.08-5.99zM6.5 16c-.83 0-1.5-.67-1.5-1.5S5.67 13 6.5 13s1.5.67 1.5 1.5S7.33 16 6.5 16zm11 0c-.83 0-1.5-.67-1.5-1.5s.67-1.5 1.5-1.5 1.5.67 1.5 1.5-.67 1.5-1.5 1.5zM5 11l1.5-4.5h11L19 11H5z'/%3E%3C/svg%3E");
    background-size: 14px 14px;
    background-position: center;
    background-repeat: no-repeat;
}

/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: #ff6b81 rgba(0, 0, 0, 0.1);
}

/* Enhanced Interactive Cursor */
.cursor {
    width: 8px;
    height: 8px;
    background: linear-gradient(45deg, #ff6b81, #c01c7a);
    border-radius: 50%;
    position: fixed;
    pointer-events: none;
    z-index: 9999;
    transition: transform 0.1s ease;
    transform: translate(-50%, -50%);
    mix-blend-mode: difference;
}

.cursor::before {
    content: '';
    position: absolute;
    width: 24px;
    height: 24px;
    border: 2px solid rgba(102, 126, 234, 0.3);
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    transition: all 0.3s ease;
}

.cursor::after {
    content: '';
    position: absolute;
    width: 40px;
    height: 40px;
    border: 1px solid rgba(102, 126, 234, 0.1);
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    transition: all 0.5s ease;
}

/* Cursor hover effects */
.cursor.hover {
    transform: translate(-50%, -50%) scale(1.5);
    background: rgba(255, 255, 255, 0.8);
}

.cursor.hover::before {
    width: 32px;
    height: 32px;
    border-color: rgba(255, 255, 255, 0.5);
}

.cursor.hover::after {
    width: 48px;
    height: 48px;
    border-color: rgba(255, 255, 255, 0.3);
}

.cursor.click {
    transform: translate(-50%, -50%) scale(0.8);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    transition: all 0.3s ease;
}

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

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(45deg, #ff6b81, #c01c7a);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(45deg, #ff6b81, #c01c7a);
    transition: width 0.3s ease;
}

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

/* Active nav link (scrollspy) */
.nav-link.active {
    background: linear-gradient(45deg, #ff6b81, #c01c7a);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-link.active::after {
    width: 100%;
    height: 3px;
    background: linear-gradient(45deg, #ff6b81, #c01c7a);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    z-index: 1001;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0;
    transition: 0.3s;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: linear-gradient(135deg, #ff6b81 0%, #c01c7a 100%);
    overflow: hidden;
}

.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 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

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

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

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.gradient-text {
    background: linear-gradient(45deg, #fff, #f0f0f0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 1.5rem;
    font-weight: 400;
}

.hero-description {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 2rem;
    line-height: 1.6;
}

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

.btn {
    padding: 1rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    border: 2px solid transparent;
}

.btn-primary {
    background: linear-gradient(45deg, #fff, #f0f0f0);
    color: #333;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.btn-secondary {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-3px);
}

/* Floating Cards laid out in a single responsive row */
.hero-visual {
    display: flex;
    justify-content: center; /* center row by default */
    gap: 2rem;
    align-items: center;
    width: 100%;
    padding: 2rem 0;
}

.floating-card {
    position: relative;
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 20px;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: #fff;
    animation: float 6s ease-in-out infinite;
    width: 160px;
    text-align: center;
    margin: 0 0.75rem;
    transform: translateY(0);
}

.floating-card i, .floating-card .math-symbol {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.floating-card span {
    font-size: 0.95rem;
    font-weight: 500;
    line-height: 1.2;
}

@media (max-width: 900px) {
    .hero-content { grid-template-columns: 1fr; }
    .hero-visual { flex-wrap: wrap; gap: 1rem; justify-content: center; }
    .floating-card { width: 140px; }
}

/* Removed 3D car styles (car model was removed) */

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    25% { transform: translateY(-15px) rotate(1deg); }
    50% { transform: translateY(-25px) rotate(0deg); }
    75% { transform: translateY(-15px) rotate(-1deg); }
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 30px;
    height: 30px;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-top: none;
    border-left: none;
    transform: rotate(45deg);
}

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

/* Container */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 2.5rem;
}

/* Section Styles */
section {
    padding: 6rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 3.25rem;
}

.section-title {
    font-size: 3rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 0.75rem;
    background: linear-gradient(45deg, #ff6b81, #c01c7a);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.05rem;
    color: #555;
    opacity: 0.85;
}

/* Publications styles */
.publications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.25rem;
    align-items: start;
}

.publication-card {
    background: rgba(255, 255, 255, 0.06);
    padding: 1.25rem;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: #fff;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.publication-card h3 {
    font-size: 1.05rem;
    margin-bottom: 0.35rem;
}

.publication-card a {
    color: #fff;
    text-decoration: none;
}

.pub-meta {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.72);
    margin-bottom: 0.5rem;
}

.pub-abstract {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.4;
}

/* Make the Publications section title fully white for better contrast */
#publications .section-title {
    background: none !important;
    color: #ffffff !important;
    -webkit-text-fill-color: #ffffff !important;
    -webkit-background-clip: unset !important;
    background-clip: unset !important;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.35);
}

/* About Section */
.about {
    background: #fff;
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    align-items: start;
}

.about-text p {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    color: #555;
    line-height: 1.8;
}

.skills h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: #333;
}

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

.skill-tag {
    background: linear-gradient(45deg, #ff6b81, #c01c7a);
    color: #fff;
    padding: 0.5rem 1rem;
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: transform 0.3s ease;
}

.skill-tag:hover {
    transform: translateY(-2px);
}

/* Experience Section */
.experience {
    background: #f8f9fa;
}

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

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(45deg, #ff6b81, #c01c7a);
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    display: flex;
    align-items: center;
}

.timeline-item:nth-child(odd) {
    flex-direction: row;
}

.timeline-item:nth-child(even) {
    flex-direction: row-reverse;
}

.timeline-marker {
    width: 20px;
    height: 20px;
    background: linear-gradient(45deg, #ff6b81, #c01c7a);
    border-radius: 50%;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.timeline-content {
    background: #fff;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    width: 45%;
    position: relative;
    transition: transform 0.3s ease;
}

.timeline-content:hover {
    transform: translateY(-5px);
}

.timeline-content h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: #333;
}

.timeline-content h4 {
    font-size: 1rem;
    color: #667eea;
    margin-bottom: 0.5rem;
}

.timeline-date {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 1rem;
    font-style: italic;
}

/* Projects Section */
.projects {
    background: #fff;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.25rem;
}

.project-card {
    background: #fff;
    padding: 2.25rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid #f0f0f0;
}

.project-card:hover {
    transform: translateY(-8px) scale(1.01);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.18);
}

.project-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(45deg, #ff6b81, #c01c7a);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.project-icon i {
    font-size: 1.5rem;
    color: #fff;
}

.project-card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.8rem;
    color: #333;
}

.project-card p {
    color: #666;
    margin-bottom: 1.25rem;
    line-height: 1.6;
}

.project-link {
    color: #ff6b81;
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: color 0.3s ease;
}

.project-link:hover {
    color: #c01c7a;
}

.project-status {
    display: inline-block;
    background: linear-gradient(45deg, #ff6b81, #c01c7a);
    color: #fff;
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-top: 0.5rem;
}

.project-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem 1rem;
    align-items: center;
}

.project-status.award {
    background: linear-gradient(45deg, #ffb347, #ffcc33);
    color: #3b2d00;
    box-shadow: 0 8px 20px rgba(255, 179, 71, 0.35);
}

.hackathons {
    background: #f8f9fb;
}

.hackathon-card {
    border: 1px solid #eaeaea;
}

.hackathon-card .project-icon {
    background: linear-gradient(45deg, #34c759, #0fb9b1);
}

.hackathon-card .project-link {
    color: #0f9bff;
}

/* Contact Section */
.contact {
    background: linear-gradient(135deg, #ff6b81 0%, #c01c7a 100%);
    color: #fff;
}

.contact .section-title {
    background: linear-gradient(45deg, #fff, #f0f0f0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.contact-intro {
    text-align: center;
    font-size: 1.2rem;
    margin-bottom: 3rem;
    opacity: 0.9;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.contact-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    padding: 2rem;
    text-align: center;
    transition: transform 0.3s ease;
}

.contact-card:hover {
    transform: translateY(-5px);
}

.contact-icon {
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
}

.contact-icon i {
    font-size: 1.5rem;
    color: #fff;
}

.contact-card h3 {
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.contact-card a {
    color: #fff;
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.contact-card a:hover {
    opacity: 1;
}

.contact-cta {
    text-align: center;
    margin-top: 3rem;
}

.contact-cta p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

/* Footer */
.footer {
    background: #333;
    color: #fff;
    text-align: center;
    padding: 2rem 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 0;
        flex-direction: column;
        background-color: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding-top: 5rem;
        height: 100vh;
        justify-content: flex-start;
        gap: 2rem;
    }

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

    .nav-menu li {
        margin: 1rem 0;
    }

    .nav-link {
        font-size: 1.2rem;
        padding: 1rem 0;
        display: block;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-visual {
        display: none;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .timeline::before {
        left: 20px;
    }
    
    .timeline-item {
        flex-direction: row !important;
    }
    
    .timeline-marker {
        left: 20px;
    }
    
    .timeline-content {
        width: calc(100% - 60px);
        margin-left: 60px;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero-buttons {
        justify-content: center;
    }

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

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

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .btn {
        padding: 0.8rem 1.5rem;
        font-size: 0.9rem;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

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

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

    .timeline-content {
        padding: 1.5rem;
    }

    .project-card {
        padding: 1.5rem;
    }

    .contact-card {
        padding: 1.5rem;
    }
}

/* Loading animation */
.loading {
    opacity: 0;
    transition: opacity 0.5s ease;
}

.loading.loaded {
    opacity: 1;
}

/* Reveal animation */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}