:root {
    --text-color: #0f172a;
    --bg-color: #fafafa;
    --accent-color: #475569;
    --link-color: #0ea5e9;
    --highlight-color: #f59e0b;
    --secondary-bg: #f1f5f9;
    --border-color: #cbd5e1;
    --gradient-primary: linear-gradient(135deg, #f59e0b 0%, #f97316 50%, #ef4444 100%);
    --gradient-secondary: linear-gradient(135deg, #0ea5e9 0%, #3b82f6 50%, #8b5cf6 100%);
    --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 12px rgba(0, 0, 0, 0.15);
    --transition-speed: 0.3s;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-color);
    background-image: radial-gradient(circle at 20% 80%, rgba(249, 158, 11, 0.1) 0%, transparent 50%),
                      radial-gradient(circle at 80% 20%, rgba(14, 165, 233, 0.1) 0%, transparent 50%);
    color: var(--text-color);
    line-height: 1.6;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    font-weight: 400;
    min-height: 100vh;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 4rem;
}

.logo {
    font-family: 'Inter', serif;
    font-size: 2rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--text-color);
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: var(--highlight-color);
}

h1 {
    font-size: 4rem;
    margin-bottom: 1rem;
    font-weight: 700;
    line-height: 1.2;
}

.intro {
    font-size: 1.25rem;
    margin-bottom: 4rem;
    max-width: 800px;
    letter-spacing: -0.011em;
    line-height: 1.7;
}

.writing-section {
    margin-top: 4rem;
}

.writing-section h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--accent-color);
    padding-bottom: 0.5rem;
    font-weight: 700;
}

.article {
    margin-bottom: 2rem;
}

.article a {
    color: var(--link-color); /* Use the link color */
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: bold;
    display: block;
    margin-bottom: 0.5rem;
    letter-spacing: -0.011em;
    transition: text-decoration 0.3s ease; /* Smooth underline transition */
}

.article a:hover {
    text-decoration: underline;
}

.article .subtitle {
    color: var(--accent-color);
    font-style: italic;
    font-size: 1.1rem;
    letter-spacing: -0.008em;
}

.article .date {
    color: var(--accent-color);
    font-size: 0.9rem;
    text-align: right;
    font-style: italic;
}

/* --- Styles for the About Page --- */
.publications-section {
    margin-top: 3rem;
}

.publications-section h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--accent-color);
    padding-bottom: 0.5rem;
    font-weight: 700;
}

.publications-section ol {
    list-style-type: decimal; /* Keep the numbered list */
    padding-left: 2rem; /* Indent the list items */
}

.publications-section li {
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

.publications-section li cite {
    font-style: italic;
    display: block; /* Make the citation a block element */
    margin-bottom: 0.5rem;
}

.publications-section li a {
    color: var(--link-color); /* Style the links in publications */
    text-decoration: none;
    transition: text-decoration 0.3s ease;
}

.publications-section li a:hover {
    text-decoration: underline;
}

/* --- About Page Specific Styles --- */
.about-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    margin: 2rem 0;
}

.about-text p {
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.skills-container {
    margin-top: 3rem;
    background-color: var(--secondary-bg);
    border-radius: 12px;
    padding: 2rem;
    border: 1px solid var(--border-color);
}

.skills-container h3 {
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
    color: var(--highlight-color);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 2rem;
}

.skill-category h4 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
    color: var(--text-color);
    border-bottom: 1px solid var(--accent-color);
    padding-bottom: 0.5rem;
}

.skill-category ul {
    list-style: none;
}

.skill-category li {
    margin-bottom: 0.5rem;
    color: var(--accent-color);
    transition: color var(--transition-speed) ease;
}

.skill-category li:hover {
    color: var(--text-color);
}

/* Education Section */
.education-section {
    margin-top: 3rem;
}

.education-section h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--accent-color);
    padding-bottom: 0.5rem;
    font-weight: 700;
}

.education-item {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px dashed var(--border-color);
}

.education-item:last-child {
    border-bottom: none;
}

.edu-year {
    color: var(--highlight-color);
    font-weight: bold;
}

.edu-details h3 {
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

.edu-institution {
    color: var(--accent-color);
    font-style: italic;
    margin-bottom: 0.5rem;
}

/* --- Blog Specific Styles --- */
.blog-posts {
    margin-top: 3rem;
}

.blog-posts .article {
    margin-bottom: 4rem;
    padding-bottom: 3rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.blog-posts .article:last-child {
    border-bottom: none;
}

.blog-posts .article a {
    color: var(--text-color);
    font-size: 2rem;
    font-weight: 700;
    text-decoration: none;
    margin-bottom: 0.5rem;
    display: inline-block;
    transition: color var(--transition-speed) ease;
}

.blog-posts .article a:hover {
    color: var(--highlight-color);
}

.blog-posts .article .subtitle {
    color: var(--accent-color);
    font-style: italic;
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.blog-posts .article .excerpt {
    margin: 1rem 0;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.8);
}

.blog-posts .article .date {
    color: var(--accent-color);
    font-size: 0.9rem;
    margin-top: 1rem;
}

.blog-posts .article .tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}

.blog-posts .article .tag {
    background-color: rgba(137, 180, 250, 0.1);
    color: var(--link-color);
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    font-size: 0.8rem;
    transition: background-color var(--transition-speed) ease;
}

.blog-posts .article .tag:hover {
    background-color: rgba(137, 180, 250, 0.2);
}

/* Newsletter Section */
.newsletter-section {
    margin-top: 5rem;
    padding: 3rem;
    background-color: rgba(199, 92, 238, 0.05);
    border-radius: 8px;
    text-align: center;
}

.newsletter-section h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--highlight-color);
}

.newsletter-section p {
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.newsletter-form {
    display: flex;
    max-width: 500px;
    margin: 0 auto;
    gap: 1rem;
}

.newsletter-form input {
    flex: 1;
    padding: 0.8rem 1rem;
    border: 1px solid var(--accent-color);
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-color);
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color var(--transition-speed) ease;
}

.newsletter-form input:focus {
    outline: none;
    border-color: var(--highlight-color);
}

.newsletter-form button {
    padding: 0.8rem 1.5rem;
    background-color: var(--highlight-color);
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color var(--transition-speed) ease;
}

.newsletter-form button:hover {
    background-color: rgba(199, 92, 238, 0.8);
}

/* Blog Post Page */
.blog-post-header {
    margin-bottom: 3rem;
}

.blog-post-header h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.blog-post-header .meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--accent-color);
    margin-bottom: 2rem;
}

.blog-post-content {
    line-height: 1.9;
}

.blog-post-content p {
    margin-bottom: 1.5rem;
}

.blog-post-content h2 {
    font-size: 2rem;
    margin: 3rem 0 1.5rem;
}

.blog-post-content h3 {
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
}

.blog-post-content ul, 
.blog-post-content ol {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

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

.blog-post-content img {
    max-width: 100%;
    border-radius: 8px;
    margin: 2rem 0;
}

.blog-post-content blockquote {
    border-left: 4px solid var(--highlight-color);
    padding-left: 1.5rem;
    margin: 2rem 0;
    font-style: italic;
    color: var(--accent-color);
}

.blog-post-content pre {
    background-color: rgba(255, 255, 255, 0.05);
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 2rem 0;
}

.blog-post-content code {
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
}

.blog-post-footer {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid var(--accent-color);
}

.blog-post-footer h3 {
    margin-bottom: 1rem;
}

.share-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.share-button {
    padding: 0.5rem 1rem;
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-color);
    border-radius: 4px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    transition: background-color var(--transition-speed) ease;
}

.share-button:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.related-posts {
    margin-top: 3rem;
}

.related-posts h3 {
    margin-bottom: 1.5rem;
}

.related-posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 2rem;
}

.related-post {
    background-color: rgba(255, 255, 255, 0.03);
    padding: 1.5rem;
    border-radius: 8px;
    transition: transform var(--transition-speed) ease;
}

.related-post:hover {
    transform: translateY(-5px);
}

.related-post a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: bold;
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    display: block;
}

.related-post .date {
    color: var(--accent-color);
    font-size: 0.8rem;
    margin-top: 0.5rem;
}

/* --- Footer Styles --- */
footer {
    margin-top: 5rem;
    padding-top: 2rem;
    border-top: 1px solid var(--accent-color);
    text-align: center;
    font-size: 0.9rem;
    color: var(--accent-color);
}

footer .social-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin: 1rem 0;
}

footer .social-links a {
    color: var(--text-color);
    transition: transform var(--transition-speed) ease, color var(--transition-speed) ease;
}

footer .social-links a:hover {
    color: var(--highlight-color);
    transform: translateY(-3px);
}

/* Hero Section Styles */
.hero-section {
    position: relative;
    text-align: center;
    padding: 6rem 0 8rem;
    max-width: 700px;
    margin: 0 auto;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 0;
}

.solar-system {
    position: absolute;
    top: 0%;
    right: 0%;
    width: 1200px;
    height: 300px;
    opacity: 0.7;
}

.sun {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 24px;
    height: 24px;
    background: radial-gradient(circle, #fbbf24 0%, #f59e0b 40%, #d97706 100%);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 20px rgba(251, 191, 36, 0.6), 0 0 40px rgba(251, 191, 36, 0.3);
    animation: solar-glow 4s ease-in-out infinite alternate;
}

@keyframes solar-glow {
    0% { box-shadow: 0 0 20px rgba(251, 191, 36, 0.6), 0 0 40px rgba(251, 191, 36, 0.3); }
    100% { box-shadow: 0 0 30px rgba(251, 191, 36, 0.8), 0 0 60px rgba(251, 191, 36, 0.4); }
}

.orbit {
    position: absolute;
    top: 50%;
    left: 50%;
    border: 1px solid rgba(148, 163, 184, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
}

.orbit-1 {
    width: 80px;
    height: 80px;
    animation: orbit-1 15s linear infinite;
}

.orbit-2 {
    width: 110px;
    height: 110px;
    animation: orbit-2 25s linear infinite;
}

.orbit-3 {
    width: 140px;
    height: 140px;
    animation: orbit-3 35s linear infinite;
}

.orbit-4 {
    width: 170px;
    height: 170px;
    animation: orbit-4 50s linear infinite;
}

.planet {
    position: absolute;
    border-radius: 50%;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
}

.mercury {
    width: 6px;
    height: 6px;
    background: #8c7853;
    margin-top: -3px;
}

.venus {
    width: 8px;
    height: 8px;
    background: #ffc649;
    margin-top: -4px;
}

.earth {
    width: 10px;
    height: 10px;
    background: radial-gradient(circle at 30% 30%, #6b93d6 0%, #1e40af 60%, #065f46 100%);
    margin-top: -5px;
    box-shadow: 0 0 8px rgba(107, 147, 214, 0.4);
}

.mars {
    width: 8px;
    height: 8px;
    background: #cd5c5c;
    margin-top: -4px;
}

@keyframes orbit-1 {
    from { transform: translate(-50%, -50%) rotate(20deg); }
    to { transform: translate(-50%, -50%) rotate(380deg); }
}

@keyframes orbit-2 {
    from { transform: translate(-50%, -50%) rotate(60deg); }
    to { transform: translate(-50%, -50%) rotate(430deg); }
}

@keyframes orbit-3 {
    from { transform: translate(-50%, -50%) rotate(180deg); }
    to { transform: translate(-50%, -50%) rotate(540deg); }
}

@keyframes orbit-4 {
    from { transform: translate(-50%, -50%) rotate(270deg); }
    to { transform: translate(-50%, -50%) rotate(630deg); }
}

.hero-content {
    position: relative;
    z-index: 1;
}

.greeting-constellation {
    position: relative;
    display: inline-block;
    margin-bottom: 2rem;
    padding: 1rem 1.5rem;
    background: rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(203, 213, 225, 0.3);
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.greeting-link {
    text-decoration: none;
    color: inherit;
    display: block;
    transition: all var(--transition-speed) ease;
}

.greeting-link:hover {
    transform: translateY(-2px);
}

.greeting-constellation:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.greeting-text {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--accent-color);
    text-align: center;
    letter-spacing: 0.5px;
    position: relative;
}

.greeting-text::before {
    content: '';
    position: absolute;
    left: -1.5rem;
    top: 50%;
    transform: translateY(-50%);
    animation: sparkle 2s ease-in-out infinite;
}

@keyframes sparkle {
    0%, 100% { 
        opacity: 0.6;
        transform: translateY(-50%) scale(1);
    }
    50% { 
        opacity: 1;
        transform: translateY(-50%) scale(1.2);
    }
}

.hero-section h1 {
    font-size: 4.5rem;
    margin-bottom: 2rem;
    font-weight: 800;
    line-height: 1.1;
}

.name-highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
}

.dot {
    color: var(--highlight-color);
    font-size: 5rem;
}

.role-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.role-text {
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--accent-color);
    letter-spacing: 0.5px;
}

.role-divider {
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--highlight-color);
}

.cta-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.primary-cta {
    display: inline-flex;
    align-items: center;
    gap: 1rem;
    padding: 1.2rem 2.5rem;
    background: var(--gradient-primary);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all var(--transition-speed) ease;
    box-shadow: var(--shadow-medium);
    position: relative;
    overflow: hidden;
}

.primary-cta::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 0.6s;
}

.primary-cta:hover::before {
    left: 100%;
}

.primary-cta:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(249, 158, 11, 0.4);
}

.cta-icon {
    display: flex;
    align-items: center;
}

.cta-arrow {
    font-size: 1.2rem;
    transition: transform var(--transition-speed) ease;
}

.primary-cta:hover .cta-arrow {
    transform: translateX(5px);
}

.secondary-cta {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    position: relative;
    padding: 0.5rem 0;
}

.secondary-cta::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 50%;
    background: var(--gradient-primary);
    transition: all var(--transition-speed) ease;
}

.secondary-cta:hover::after {
    width: 100%;
    left: 0;
}

/* --- Animations --- */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

main {
    animation: fadeIn 0.8s ease-out forwards;
}

.logo {
    position: relative;
}

.logo::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--highlight-color);
    transition: width var(--transition-speed) ease;
}

.logo:hover::after {
    width: 100%;
}

.nav-links a {
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -3px;
    left: 0;
    background-color: var(--highlight-color);
    transition: width var(--transition-speed) ease;
}

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

/* Project cards for portfolio section */
.projects-section {
    margin-top: 4rem;
}

.projects-section h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--accent-color);
    padding-bottom: 0.5rem;
    font-weight: 700;
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.project-card {
    background-color: var(--secondary-bg);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border-color: var(--highlight-color);
}

.project-card h3 {
    margin-bottom: 0.8rem;
    color: var(--text-color);
}

.project-card p {
    color: var(--accent-color);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

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

.project-card .tag {
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--link-color);
    padding: 0.3rem 0.6rem;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* Notebook styling */
.notebook-container {
    background-color: rgba(255, 255, 255, 0.03);
    border-radius: 8px;
    padding: 1.5rem;
    margin: 2rem 0;
    overflow-x: auto;
}

/* --- Responsive Design --- */
@media (max-width: 768px) {
    body {
        padding: 1rem;
    }

    .hero-section h1 {
        font-size: 3.5rem;
    }

    .nav-links {
        gap: 1rem;
    }

    .publications-section h2,
    .projects-section h2,
    .writing-section h2 {
        font-size: 2rem;
    }
    
    .project-grid {
        grid-template-columns: 1fr;
    }
    
    .role-container {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .role-divider {
        display: none;
    }
    
    .cta-container {
        gap: 1.5rem;
    }
    
    .primary-cta {
        padding: 1rem 2rem;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .hero-section h1 {
        font-size: 2.8rem;
    }
    
    .nav-links {
        gap: 0.8rem;
    }
    
    .hero-section {
        padding: 4rem 0 6rem;
    }
    
    .solar-system {
        width: 200px;
        height: 200px;
        top: 5%;
        right: 5%;
    }
    
    .orbit-1 { width: 60px; height: 60px; }
    .orbit-2 { width: 80px; height: 80px; }
    .orbit-3 { width: 100px; height: 100px; }
    .orbit-4 { width: 120px; height: 120px; }
    
    .sun {
        width: 18px;
        height: 18px;
    }
}