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

:root {
    /* --primary-color: #2c5f7a; */
    --secondary-color: #1a1a1a;
    --accent-color: #4a4a4a;
    --text-dark: #1a1a1a;
    --text-light: #4a4a4a;
    --bg-white: #ffffff;
    --bg-light: #f8f9fa;
    --bg-alt: #e9ecef;
    --border-color: #dee2e6;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    line-height: 1.6;
    color: #1a1a1a;
    background-color: rgba(250, 250, 250, 0.95);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 5%;
    background: rgba(250, 250, 250, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    z-index: 100;
}

.nav-links {
    display: flex;
    gap: 3rem;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: #1a1a1a;
    font-size: 0.95rem;
    font-weight: 500;
    position: relative;
    transition: color 0.3s ease;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    transition: width 0.3s ease;
}

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

nav a.active {
  color: #000;
}

.hero {
    color: #1a1a1a;
    padding: 10rem 0 5rem 0;
    text-align: center;
}

.name {
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: 2px;
    margin-bottom: var(--spacing-sm);
}

.title {
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: var(--spacing-xs);
}

.location {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.9;
}

.hero-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.hero-link {
    color: #1a1a1a;
    text-decoration: none;
    padding: var(--spacing-xs) var(--spacing-md);
    border: 2px solid #1a1a1a;
    border-radius: 4px;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

.hero-link:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.section {
    padding: var(--spacing-xl) 0;
}

.section-alt {
    background-color: var(--bg-light);
}

.section-title {
    font-size: 2.5rem;
    color: #1a1a1a;
    margin-bottom: var(--spacing-md);
    text-align: center;
    font-weight: 700;
}

.content {
    max-width: 900px;
    margin: 0 auto;
}

.content p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-light);
    margin-bottom: var(--spacing-sm);
}

.education-item {
    margin-bottom: var(--spacing-lg);
}

.education-item h3 {
    font-size: 1.5rem;
    color: #1a1a1a;
    margin-bottom: var(--spacing-xs);
}

.institution {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: var(--spacing-xs);
}

.year {
    font-size: 1rem;
    color: var(--accent-color);
    font-weight: 600;
}

.research-interests {
    margin-top: var(--spacing-lg);
}

.research-interests h3 {
    font-size: 1.5rem;
    color: #1a1a1a;
    margin-bottom: var(--spacing-sm);
}

.research-interests ul {
    list-style: none;
    padding-left: 0;
}

.research-interests li {
    font-size: 1.1rem;
    color: var(--text-light);
    padding: var(--spacing-xs) 0;
    padding-left: 1.5rem;
    position: relative;
}

.research-interests li::before {
    content: "▹";
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-sm);
    max-width: 900px;
    margin: 0 auto;
}

.skill-item {
    background-color: #fafafa;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 8px;
    text-align: center;
    font-weight: 500;
    color: #1a1a1a;
    border: 2px solid var(--border-color);
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.skill-item:hover {
    transform: translateY(-4px);
    border-color: var(--primary-color);
}

.projects-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    max-width: 1000px;
    margin: 0 auto;
}

.project-card {
    background-color: #fafafa;
    padding: var(--spacing-md);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.project-card h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.project-type {
    font-size: 0.9rem;
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.project-card ul {
    list-style: none;
    padding-left: 0;
}

.project-card li {
    color: var(--text-light);
    padding: var(--spacing-xs) 0;
    padding-left: 1.5rem;
    position: relative;
}

.project-card li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
    font-size: 1.2rem;
}

.case-study {
    max-width: 1000px;
    margin: 0 auto;
}

.case-study-title {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.case-study-section {
    margin-bottom: var(--spacing-lg);
}

.case-study-section h4 {
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
}

.case-study-section h5 {
    font-size: 1.2rem;
    color: #1a1a1a;
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
}

.case-study-section p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-light);
    margin-bottom: var(--spacing-sm);
}

.case-study-section ul {
    list-style: none;
    padding-left: 0;
    margin-top: var(--spacing-sm);
}

.case-study-section li {
    color: var(--text-light);
    padding: var(--spacing-xs) 0;
    padding-left: 1.5rem;
    position: relative;
    line-height: 1.8;
}

.case-study-section li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}

.interests-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-sm);
}

.interests-list li {
    background-color: var(--bg-light);
    padding: var(--spacing-sm);
    border-radius: 4px;
    text-align: center;
}

.interests-list li::before {
    content: "";
    display: none;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    max-width: 900px;
    margin: 0 auto;
}

.contact-item {
    text-align: center;
    padding: var(--spacing-md);
    background-color: #fafafa;
    border-radius: 8px;
    transition: transform 0.2s ease;
}

.contact-item:hover {
    transform: translateY(-4px);
}

.contact-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.contact-item h3 {
    font-size: 1.2rem;
    color: #1a1a1a;
}

.footer {
    background-color: var(--secondary-color);
    color: #fafafa;
    text-align: center;
    padding: var(--spacing-md) 0;
}

.footer p {
    margin: 0;
}

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

    .title {
        font-size: 1.2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .nav-container {
        gap: var(--spacing-sm);
    }

    .nav-link {
        font-size: 0.9rem;
    }

    .skills-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }

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

    .contact-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .name {
        font-size: 1.5rem;
    }

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

    .hero-links {
        flex-direction: column;
        align-items: center;
    }
}