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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 120px;
}

body {
    font-family: 'Georgia', 'Times New Roman', serif;
    line-height: 1.8;
    color: #2c3e50;
    background: linear-gradient(to bottom, #e8f0f8 0%, #f0f4f8 100%);
    min-height: 100vh;
}

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

header {
    background: #ffffff;
    padding: 2rem 0;
    border-bottom: 2px solid #3b82f6;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 4px rgba(59, 130, 246, 0.1);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.name-social {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.contact-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.email-link {
    color: #4a5568;
    text-decoration: none;
    font-size: 0.9rem;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    transition: color 0.3s ease;
}

.email-link:hover {
    color: #3b82f6;
}

.header-left .profile-photo img {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid #3b82f6;
    transition: border-color 0.3s ease;
}

.header-left .profile-photo img:hover {
    border-color: #2563eb;
}

header h1 {
    font-size: 2rem;
    margin-bottom: 0;
    color: #1a202c;
    font-weight: 600;
    letter-spacing: -0.5px;
}

nav {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

nav a {
    color: #4a5568;
    text-decoration: none;
    font-size: 0.95rem;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-weight: 400;
    transition: color 0.3s ease;
    position: relative;
}

nav a:hover {
    color: #3b82f6;
}

.social-links {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.social-link {
    color: #4a5568;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: #f0f4f8;
}

.social-link:hover {
    color: #3b82f6;
    background: #e0e8f0;
    transform: translateY(-2px);
}

main {
    background-color: white;
    margin: 3rem auto;
    padding: 3.5rem 4rem;
    max-width: 900px;
    border: 1px solid #e1e4e8;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.section {
    margin-bottom: 3.5rem;
    padding-bottom: 2.5rem;
    border-bottom: 1px solid #e8eef3;
}

.section:last-child {
    border-bottom: none;
}

.section h2 {
    color: #1a202c;
    font-size: 1.85rem;
    margin-bottom: 1.75rem;
    font-weight: 600;
    letter-spacing: -0.3px;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #3b82f6;
    display: inline-block;
}

.about-text {
    margin-top: 1.5rem;
}

.about-text p {
    margin-bottom: 1.2rem;
    font-size: 1.05rem;
    line-height: 1.9;
    color: #4a5568;
    text-align: justify;
}

.research-list {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
    margin-top: 2rem;
}

.research-card {
    display: flex;
    background: #ffffff;
    border: 1px solid #e1e4e8;
    overflow: hidden;
    transition: all 0.3s ease;
    text-decoration: none;
    color: inherit;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
}

.research-card:hover {
    border-color: #3b82f6;
    box-shadow: 0 6px 16px rgba(59, 130, 246, 0.12);
    transform: translateY(-2px);
}

.research-image {
    width: 280px;
    height: 180px;
    flex-shrink: 0;
    overflow: hidden;
    background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
}

.research-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: opacity 0.3s ease;
}

.research-card:hover .research-image img {
    opacity: 0.9;
}

.research-info {
    padding: 1.75rem 2rem;
    flex: 1;
}

.research-info h3 {
    color: #1e40af;
    font-size: 1.3rem;
    margin-bottom: 0.6rem;
    font-weight: 600;
    transition: color 0.3s ease;
}

.research-card:hover .research-info h3 {
    color: #2563eb;
}

.research-info p {
    margin-bottom: 0.75rem;
    line-height: 1.7;
    color: #4a5568;
    font-size: 0.95rem;
}

.content {
    margin-top: 1rem;
}

.content p {
    margin-bottom: 1rem;
    color: #4a5568;
    line-height: 1.9;
    font-size: 1rem;
}

.experience-item {
    margin-bottom: 2.25rem;
    padding: 1.75rem 0;
    border-bottom: 1px solid #f0f0f0;
    transition: padding-left 0.3s ease;
}

.experience-item:hover {
    padding-left: 0.5rem;
}

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

.experience-item h3 {
    color: #1e40af;
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
    transition: color 0.3s ease;
}

.experience-item:hover h3 {
    color: #2563eb;
}

.meta {
    color: #718096;
    font-style: italic;
    margin-bottom: 0.75rem;
    font-size: 0.9rem;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

footer {
    background: #ffffff;
    border-top: 1px solid #e1e4e8;
    color: #718096;
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
    font-size: 0.9rem;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 1.6rem;
    }

    .header-content {
        flex-direction: column;
        align-items: flex-start;
    }

    .header-left {
        flex-direction: column;
        align-items: flex-start;
    }

    .header-left .profile-photo img {
        width: 90px;
        height: 90px;
    }

    nav {
        gap: 1rem;
        width: 100%;
    }

    nav a {
        font-size: 0.9rem;
    }

    main {
        padding: 2rem 1.5rem;
        margin: 2rem auto;
    }

    .section h2 {
        font-size: 1.5rem;
    }

    .research-card {
        flex-direction: column;
    }

    .research-image {
        width: 100%;
        height: 200px;
    }

    .research-info {
        padding: 1.5rem;
    }

    .experience-item h3 {
        font-size: 1.1rem;
    }
}