:root {
    --color-bg: #fafaf8;
    --color-text: #1a1a1a;
    --color-text-secondary: #4a4a4a;
    --color-accent: #2c5f9e;
    --color-accent-hover: #1d4470;
    --color-border: #d4d4d0;
    --color-card-bg: #ffffff;
    --font-serif: 'Crimson Pro', Georgia, serif;
    --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
    --max-width: 1100px;
    --spacing-unit: 1.5rem;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-serif);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    font-size: 18px;
    overflow-x: hidden;
}

/* Subtle grain texture */
.grain {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    opacity: 0.03;
    z-index: 1000;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='2.5' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(250, 250, 248, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
    animation: slideDown 0.6s ease-out;
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.nav-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1.2rem 2rem;
    display: flex;
    justify-content: flex-end;
    gap: 2rem;
}

.nav-link {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-accent);
    transition: width 0.3s ease;
}

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

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

/* Hero Section */
.hero {
    padding: 8rem 2rem 6rem;
    margin-top: 60px;
    animation: fadeIn 1s ease-out;
}

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

.hero-content {
    max-width: var(--max-width);
    margin: 0 auto;
}

.profile-section {
    display: flex;
    align-items: center;
    gap: 3rem;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.profile-image-container {
    flex-shrink: 0;
}

.profile-image {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--color-accent);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.profile-image:hover {
    transform: scale(1.05);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.profile-info {
    flex-grow: 1;
}

.name {
    font-size: 3.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    line-height: 1.1;
}

.title {
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 1.5rem;
}

.social-links {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.social-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--color-accent);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border: 1px solid var(--color-accent);
    border-radius: 4px;
    transition: all 0.3s ease;
}

.social-link:hover {
    background-color: var(--color-accent);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(44, 95, 158, 0.3);
}

/* Container */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* Sections */
.section {
    padding: 6rem 0;
    animation: fadeInUp 0.8s ease-out both;
    animation-timeline: view();
    animation-range: entry 0% cover 30%;
}

.section-alt {
    background-color: var(--color-card-bg);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 3rem;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 60px;
    height: 3px;
    background-color: var(--color-accent);
}

/* About Section */
.about-content {
    max-width: 800px;
}

.lead {
    font-size: 1.3rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    color: var(--color-text);
}

.about-content p {
    margin-bottom: 1rem;
    color: var(--color-text-secondary);
}

/* Research Section */
.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.research-card {
    background-color: var(--color-bg);
    padding: 2rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.research-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent), transparent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.research-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.research-card:hover::before {
    transform: scaleX(1);
}

.research-number {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--color-accent);
    margin-bottom: 1rem;
    font-weight: 600;
}

.research-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 0.8rem;
}

.research-description {
    color: var(--color-text-secondary);
    line-height: 1.6;
    font-size: 0.95rem;
}

/* Projects Section */
.projects-list {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.project-card {
    background-color: var(--color-card-bg);
    padding: 2.5rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    transition: all 0.3s ease;
}

.project-card:hover {
    transform: translateX(8px);
    box-shadow: -4px 0 0 0 var(--color-accent), 0 4px 20px rgba(0, 0, 0, 0.08);
}

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

.project-title {
    font-size: 1.6rem;
    font-weight: 600;
}

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

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-accent);
    text-decoration: none;
    padding: 0.4rem 0.8rem;
    border: 1px solid var(--color-accent);
    border-radius: 3px;
    transition: all 0.3s ease;
}

.project-link:hover {
    background-color: var(--color-accent);
    color: white;
}

.project-description {
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    background-color: var(--color-bg);
    padding: 0.4rem 0.8rem;
    border-radius: 3px;
    border: 1px solid var(--color-border);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

.contact-text {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    margin-bottom: 2rem;
}

.contact-button {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 1rem;
    color: white;
    background-color: var(--color-accent);
    padding: 1rem 2.5rem;
    border-radius: 4px;
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    transition: all 0.3s ease;
    border: 2px solid var(--color-accent);
}

.contact-button:hover {
    background-color: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(44, 95, 158, 0.3);
}

/* Footer */
.footer {
    padding: 3rem 0;
    text-align: center;
    color: var(--color-text-secondary);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    border-top: 1px solid var(--color-border);
}

/* Responsive Design */
@media (max-width: 768px) {
    .profile-section {
        flex-direction: column;
        text-align: center;
    }
    
    .name {
        font-size: 2.5rem;
    }
    
    .social-links {
        justify-content: center;
    }
    
    .section {
        padding: 4rem 0;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .research-grid {
        grid-template-columns: 1fr;
    }
    
    .project-header {
        flex-direction: column;
    }
    
    .nav-content {
        padding: 1rem;
        gap: 1rem;
    }
    
    .nav-link {
        font-size: 0.75rem;
    }
}

@media (max-width: 480px) {
    body {
        font-size: 16px;
    }
    
    .hero {
        padding: 6rem 1rem 4rem;
    }
    
    .profile-image {
        width: 150px;
        height: 150px;
    }
    
    .name {
        font-size: 2rem;
    }
    
    .container {
        padding: 0 1rem;
    }
}

/* Print styles for CV export */
@media print {
    .nav,
    .grain {
        display: none;
    }
    
    .hero {
        margin-top: 0;
        padding: 2rem 0;
    }
    
    .section {
        page-break-inside: avoid;
    }
}

/* Blog Section */
.blog-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-top: 2rem;
}

.blog-category {
    display: flex;
    flex-direction: column;
}

.blog-category-title {
    font-family: var(--font-serif);
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--color-accent);
    padding-bottom: 0.5rem;
}

.blog-posts {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.blog-link {
    color: var(--color-text);
    text-decoration: none;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    padding: 0.5rem 0;
    border-left: 3px solid transparent;
    padding-left: 0.75rem;
}

.blog-link:hover {
    color: var(--color-accent);
    border-left-color: var(--color-accent);
    padding-left: 1rem;
}

@media (max-width: 768px) {
    .blog-list {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}