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

:root {
    --primary-color: #000000;
    --accent-color: #333333;
    --text-dark: #000000;
    --text-medium: #333333;
    --text-light: #666666;
    --bg-white: #ffffff;
    --bg-light: #fafafa;
    --bg-lighter: #f5f5f5;
    --border-color: #dddddd;
    --shadow-sm: none;
    --shadow-md: none;
    --shadow-lg: none;
    --transition: none;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Georgia', 'Times New Roman', serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Typography */
h1, h2, h3 {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-weight: 600;
    line-height: 1.3;
    color: var(--primary-color);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: #ffffff;
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 20px;
}

.logo {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-color);
    text-decoration: none;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 1.5rem;
}

.nav-links a {
    color: var(--text-medium);
    text-decoration: none;
    font-weight: 500;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 0.85rem;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary-color);
    text-decoration: underline;
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    gap: 5px;
}

.mobile-toggle span {
    width: 24px;
    height: 2px;
    background: var(--primary-color);
}

/* Hero Section */
.hero {
    min-height: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-white);
    padding-top: 80px;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
}

.hero-content {
    text-align: center;
    max-width: 750px;
    margin: 0 auto;
}

.hero h1 {
    font-size: clamp(1.8rem, 4vw, 2.2rem);
    margin-bottom: 0.3rem;
    color: var(--primary-color);
    font-weight: 700;
}

.subtitle {
    font-size: clamp(0.95rem, 2vw, 1.05rem);
    color: var(--text-medium);
    margin-bottom: 0.3rem;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.bio {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 1rem;
    line-height: 1.4;
    display: none;
}

.contact-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    align-items: center;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.3rem 0.6rem;
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 0;
    text-decoration: none;
    color: var(--text-medium);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 0.75rem;
}

.contact-link:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.contact-link svg {
    flex-shrink: 0;
    width: 14px;
    height: 14px;
}

/* Section Styles */
section {
    padding: 40px 0;
}

.section-title {
    font-size: clamp(1.3rem, 3vw, 1.5rem);
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    position: relative;
    padding-bottom: 0.5rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 1px;
    background: var(--primary-color);
}

/* Education Section */
.education {
    background: var(--bg-white);
}

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

.timeline-item {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.timeline-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
    margin-bottom: 0;
}

.timeline-date {
    min-width: 140px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 0.8rem;
    color: var(--text-light);
    font-weight: 500;
    padding-top: 2px;
}

.timeline-content {
    flex: 1;
}

.timeline-content h3 {
    font-size: 1rem;
    margin-bottom: 0.3rem;
    color: var(--primary-color);
    line-height: 1.3;
}

.degree {
    font-size: 0.9rem;
    color: var(--text-medium);
    margin-bottom: 0.15rem;
}

.gpa {
    font-size: 0.8rem;
    color: var(--text-dark);
    font-weight: 600;
    margin-bottom: 0.15rem;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.location {
    font-size: 0.8rem;
    color: var(--text-light);
    font-style: italic;
}

/* Publications Section */
.publications {
    background: var(--bg-light);
}

.publication-list {
    max-width: 800px;
    margin: 0 auto;
}

.publication-item {
    background: var(--bg-white);
    padding: 1rem 1.2rem;
    border-radius: 0;
    border: 1px solid var(--border-color);
    margin-bottom: 0.75rem;
}

.publication-authors {
    font-size: 0.8rem;
    color: var(--text-medium);
    margin-bottom: 0.3rem;
    line-height: 1.4;
}

.publication-title {
    font-size: 0.9rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0.25rem;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.publication-venue {
    font-size: 0.75rem;
    color: var(--text-light);
}

/* Skills Section */
.skills {
    background: var(--bg-white);
}

.skills-content {
    max-width: 800px;
    margin: 0 auto;
    display: grid;
    gap: 0.75rem;
}

.skill-category {
    background: var(--bg-light);
    padding: 1rem 1.2rem;
    border-radius: 0;
    border: 1px solid var(--border-color);
}

.skill-category h3 {
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
    font-weight: 600;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.skill-tag {
    padding: 0.25rem 0.6rem;
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 0;
    font-size: 0.75rem;
    color: var(--text-medium);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* Awards Section */
.awards {
    background: var(--bg-light);
}

.awards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 0.75rem;
    max-width: 800px;
    margin: 0 auto;
}

.award-card {
    background: var(--bg-white);
    padding: 1rem 1.2rem;
    border-radius: 0;
    border: 1px solid var(--border-color);
    border-left: 2px solid var(--primary-color);
}

.award-year {
    display: inline-block;
    padding: 0.2rem 0.5rem;
    background: var(--bg-light);
    border-radius: 0;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    border: 1px solid var(--border-color);
}

.award-card h3 {
    font-size: 0.9rem;
    margin-bottom: 0.3rem;
    color: var(--primary-color);
    font-weight: 600;
}

.award-card p {
    font-size: 0.75rem;
    color: var(--text-light);
    line-height: 1.4;
}

/* Contact Section */
.contact {
    background: var(--bg-white);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.contact-info h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.contact-info p {
    color: var(--text-medium);
    margin-bottom: 1rem;
    font-size: 0.85rem;
    line-height: 1.5;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.contact-method {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.6rem 0.8rem;
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: 0;
    text-decoration: none;
    color: var(--text-medium);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 0.75rem;
}

.contact-method:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.contact-method .icon {
    font-size: 1rem;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group input,
.form-group textarea {
    padding: 0.6rem;
    border: 1px solid var(--border-color);
    border-radius: 0;
    font-family: inherit;
    font-size: 0.8rem;
    background: var(--bg-white);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.btn {
    padding: 0.6rem 1.2rem;
    border-radius: 0;
    text-decoration: none;
    font-weight: 600;
    display: inline-block;
    cursor: pointer;
    border: 2px solid var(--primary-color);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 0.8rem;
}

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

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

/* Footer */
.footer {
    background: var(--primary-color);
    color: white;
    padding: 1rem 0;
    border-top: 1px solid var(--primary-color);
}

.footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.footer p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.75rem;
}

.social-links {
    display: flex;
    gap: 1.2rem;
}

.social-links a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 0.75rem;
}

.social-links a:hover {
    color: white;
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 2rem;
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: var(--transition);
        border-bottom: 1px solid var(--border-color);
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .mobile-toggle {
        display: flex;
    }

    .timeline {
        padding-left: 0;
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        grid-template-columns: 1fr;
        padding-left: 50px;
    }

    .timeline-item::before {
        left: 11px;
    }

    .timeline-date {
        text-align: left;
        font-size: 0.9rem;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

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

    .contact-links {
        flex-direction: column;
        align-items: stretch;
    }

    .contact-link {
        justify-content: center;
    }

    .footer .container {
        flex-direction: column;
        text-align: center;
    }

    section {
        padding: 30px 0;
    }
    
    .timeline-item {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .timeline-date {
        min-width: auto;
    }
}

@media (max-width: 480px) {
    .hero {
        padding-top: 70px;
        padding-bottom: 20px;
    }

    .timeline-content {
        padding: 0.8rem 1rem;
    }

    .publication-item {
        padding: 0.8rem 1rem;
    }

    .skill-category {
        padding: 0.8rem 1rem;
    }
    
    .award-card {
        padding: 0.8rem 1rem;
    }
}