/* Base Styles */
:root {
    --primary-color: #2563eb;
    --secondary-color: #3b82f6;
    --dark-color: #1e293b;
    --light-color: #f8fafc;
    --text-color: #334155;
    --light-gray: #e2e8f0;
    --gray: #94a3b8;
    --border-radius: 8px;
    --transition: all 0.3s ease;
    --box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-color);
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

img, video {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.5rem;
    color: var(--dark-color);
    position: relative;
    padding-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    left: 50%;
    bottom: 0;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background-color: var(--primary-color);
    border-radius: 4px;
}

section {
    padding: 80px 0;
    position: relative;
}

#about {
    scroll-margin-top: 80px; /* Adjust this value based on your header height */
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--primary-color);
    color: white;
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    text-align: center;
}

.btn:hover {
    background-color: #1d4ed8;
    transform: translateY(-2px);
}

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

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

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

.btn.small {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

/* Header Styles */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 15px;
}

.logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark-color);
}

nav {
    display: flex;
    align-items: center;
}

nav ul {
    display: flex;
}

nav ul li {
    margin-left: 2rem;
}

nav ul li a {
    color: var(--dark-color);
    font-weight: 500;
    transition: var(--transition);
}

nav ul li a:hover {
    color: var(--primary-color);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    width: 30px;
    cursor: pointer;
}

.mobile-menu-btn span {
    height: 3px;
    width: 100%;
    background-color: var(--dark-color);
    margin: 3px 0;
    border-radius: 3px;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.9)),
                url('https://images.unsplash.com/photo-1620712943543-bcc4688e7485?ixlib=rb-4.0.3&auto=format&fit=crop&w=1950&q=80');
    background-size: cover;
    background-position: center;
    position: relative;
}

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

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    color: var(--dark-color);
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: var(--text-color);
}

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

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 3rem;
    align-items: center;
}

.about-text p {
    margin-bottom: 1.5rem;
}

.skills {
    margin-top: 2rem;
}

.skills h3 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

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

.skill-tags span {
    background-color: var(--light-gray);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.9rem;
    transition: var(--transition);
}

.skill-tags span:hover {
    background-color: var(--primary-color);
    color: white;
}

.about-image img {
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

/* Projects Section */
.projects {
    background-color: #f1f5f9;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
}

.project-card {
    background-color: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.project-media {
    height: 220px;
    overflow: hidden;
}

.project-media img, 
.project-media video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.project-card:hover .project-media img,
.project-card:hover .project-media video {
    transform: scale(1.05);
}

.project-info {
    padding: 1.5rem;
}

.project-info h3 {
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 1rem 0;
}

.project-tags span {
    background-color: var(--light-gray);
    padding: 0.3rem 0.8rem;
    border-radius: 50px;
    font-size: 0.8rem;
}

.project-links {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.project-links i {
    font-size: 1.5rem;
    color: var(--dark-color);
    transition: var(--transition);
}

.project-links i:hover {
    color: var(--primary-color);
}

/* Papers Section */
.paper-filters {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 2rem;
    gap: 0.5rem;
}

.filter-btn {
    background-color: transparent;
    border: 1px solid var(--gray);
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition);
}

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

.papers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
}

.paper-card {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.paper-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.paper-info h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.paper-authors,
.paper-conference {
    font-size: 0.9rem;
    color: var(--gray);
    margin-bottom: 0.5rem;
}

.paper-summary {
    margin: 1rem 0;
}

.paper-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 1rem 0;
}

.paper-tags span {
    background-color: var(--light-gray);
    padding: 0.3rem 0.8rem;
    border-radius: 50px;
    font-size: 0.8rem;
}

.paper-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 1rem;
}

.original-paper {
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.load-more {
    text-align: center;
    margin-top: 3rem;
}

/* Contact Section */
.contact {
    background-color: #f1f5f9;
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact-info p {
    margin-bottom: 2rem;
}

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

.contact-links a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-color);
    transition: var(--transition);
}

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

.contact-links i {
    font-size: 1.2rem;
}

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

/* Responsive Design */
@media (max-width: 991px) {
    .hero-content h1 {
        font-size: 2.8rem;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .about-image {
        order: -1;
        text-align: center;
        margin-bottom: 2rem;
    }
    
    .about-image img {
        max-width: 300px;
    }
}

@media (max-width: 768px) {
    nav ul {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    section {
        padding: 4rem 0;
    }
    
    .hero-content h1 {
        font-size: 2.2rem;
    }
    
    .projects-grid,
    .papers-grid {
        grid-template-columns: 1fr;
    }
    
    .buttons {
        flex-direction: column;
        align-items: center;
    }
}

/* Mobile Menu Styles (will be controlled by JavaScript) */
.mobile-menu-open nav ul {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: white;
    padding: 1rem 0;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.mobile-menu-open nav ul li {
    margin: 0;
    text-align: center;
}

.mobile-menu-open nav ul li a {
    display: block;
    padding: 1rem;
}

/* Paper Review Template Styles */
.paper-review {
    padding-top: 100px;
    min-height: 100vh;
}

.paper-review .container {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 2rem;
    max-width: 1400px;
}

.review-content {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.paper-header {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--light-gray);
}

.paper-header h1 {
    font-size: 2.5rem;
    color: var(--dark-color);
    margin-bottom: 1rem;
}

.paper-meta {
    color: var(--gray);
}

.paper-meta p {
    margin-bottom: 0.5rem;
}

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

.paper-links .btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.review-content section {
    margin-bottom: 3rem;
}

.review-content h2 {
    color: var(--dark-color);
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
}

.review-content h3 {
    color: var(--dark-color);
    font-size: 1.4rem;
    margin: 2rem 0 1rem;
}

.review-content p {
    margin-bottom: 1rem;
}

.review-content ul {
    list-style-type: disc;
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.review-content li {
    margin-bottom: 0.5rem;
}

.review-content pre {
    background: #f8fafc;
    padding: 1rem;
    border-radius: var(--border-radius);
    overflow-x: auto;
    margin: 1rem 0;
}

.review-content code {
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
}

.review-sidebar {
    position: sticky;
    top: 100px;
    height: fit-content;
}

.paper-info-card,
.related-papers {
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 1.5rem;
}

.paper-info-card h3,
.related-papers h3 {
    color: var(--dark-color);
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.paper-info-card ul {
    list-style: none;
}

.paper-info-card li {
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.related-papers ul {
    list-style: none;
}

.related-papers li {
    margin-bottom: 0.5rem;
}

.related-papers a {
    color: var(--primary-color);
    transition: var(--transition);
}

.related-papers a:hover {
    color: var(--secondary-color);
}

@media (max-width: 991px) {
    .paper-review .container {
        grid-template-columns: 1fr;
    }

    .review-sidebar {
        position: static;
    }
}

@media (max-width: 768px) {
    .paper-header h1 {
        font-size: 2rem;
    }

    .review-content {
        padding: 1.5rem;
    }
}

/* Additional Markdown Rendering Styles */
#markdown-content {
    line-height: 1.7;
}

#markdown-content h1,
#markdown-content h2,
#markdown-content h3,
#markdown-content h4,
#markdown-content h5,
#markdown-content h6 {
    color: var(--dark-color);
    margin-top: 2rem;
    margin-bottom: 1rem;
}

#markdown-content h1 {
    font-size: 2.2rem;
    border-bottom: 2px solid var(--light-gray);
    padding-bottom: 0.5rem;
}

#markdown-content h2 {
    font-size: 1.8rem;
    border-bottom: 1px solid var(--light-gray);
    padding-bottom: 0.5rem;
}

#markdown-content h3 {
    font-size: 1.5rem;
}

#markdown-content h4 {
    font-size: 1.3rem;
}

#markdown-content p {
    margin-bottom: 1.2rem;
}

#markdown-content strong {
    font-weight: 600;
}

#markdown-content em {
    font-style: italic;
}

#markdown-content blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: 1rem;
    color: var(--gray);
    font-style: italic;
    margin: 1.5rem 0;
}

#markdown-content ul,
#markdown-content ol {
    margin-bottom: 1.5rem;
    margin-left: 1.5rem;
}

#markdown-content ul {
    list-style-type: disc;
}

#markdown-content ol {
    list-style-type: decimal;
}

#markdown-content li {
    margin-bottom: 0.5rem;
}

#markdown-content code:not([class*="language-"]) {
    font-family: 'Courier New', Courier, monospace;
    background-color: var(--light-gray);
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-size: 0.9em;
}

#markdown-content pre {
    background: #f8fafc;
    padding: 1rem;
    border-radius: var(--border-radius);
    overflow-x: auto;
    margin: 1.5rem 0;
}

#markdown-content pre code {
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    background-color: transparent;
    padding: 0;
}

#markdown-content img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 1.5rem auto;
    border-radius: var(--border-radius);
}

#markdown-content hr {
    border: 0;
    height: 1px;
    background-color: var(--light-gray);
    margin: 2rem 0;
}

#markdown-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
}

#markdown-content th,
#markdown-content td {
    border: 1px solid var(--light-gray);
    padding: 0.75rem;
    text-align: left;
}

#markdown-content th {
    background-color: #f8fafc;
    font-weight: 600;
}

#markdown-content tr:nth-child(even) {
    background-color: #f8fafc;
}

/* MathJax Styles */
.MathJax {
    overflow-x: auto;
    max-width: 100%;
}

/* Loading and Error States */
.loading, .error {
    text-align: center;
    padding: 2rem;
}

.loading p {
    color: var(--gray);
}

.error {
    color: #e53e3e;
}

.error h2 {
    margin-bottom: 1rem;
}