/* Main CSS file for the personal website */
:root {
    --primary-color: #000000;
    --secondary-color: #333333;
    --accent-color: #666666;
    --text-light: #888888;
    --border-color: #e0e0e0;
    --bg-light: #f8f9fa;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--primary-color);
    line-height: 1.6;
}

.navbar {
    background-color: white !important;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 1rem 0;
}

.navbar-brand {
    font-weight: 600;
    color: var(--primary-color) !important;
}

.navbar-nav .nav-link {
    color: var(--secondary-color) !important;
    font-weight: 500;
    margin: 0 0.5rem;
    transition: color 0.3s ease;
}

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

.section {
    padding: 5rem 0;
    border-bottom: 1px solid var(--border-color);
}

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

.section-title {
    font-size: 2.2rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 3rem;
    text-align: left;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 1rem;
}

.intro-section {
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    padding: 6rem 0;
}

.intro-content {
    display: flex;
    align-items: center;
    gap: 4rem;
}

.intro-image {
    flex: 0 0 300px;
}

.intro-image img {
    width: 100%;
    height: 350px;
    object-fit: cover;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.intro-text {
    flex: 1;
}

.intro-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
    letter-spacing: -0.02em;
}

.intro-subtitle {
    font-size: 1.3rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
    font-weight: 400;
}

.intro-degree {
    font-size: 1rem;
    color: var(--text-light);
    margin-bottom: 2rem;
    font-style: italic;
}

.intro-description {
    font-size: 1rem;
    color: var(--secondary-color);
    line-height: 1.7;
    margin-bottom: 2rem;
}

.card {
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    transition: all 0.3s ease;
    margin-bottom: 2rem;
    background: white;
}

.card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.12);
}

.card-title {
    color: var(--primary-color);
    font-weight: 600;
}

.card-text {
    color: var(--secondary-color);
}

.badge-custom {
    background-color: var(--primary-color);
    color: white;
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 500;
    margin: 0.2rem;
}

.contact-info {
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    padding: 4rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    text-align: center;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 2.5rem;
    flex-wrap: wrap;
}

.contact-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    transition: all 0.3s ease;
    padding: 1.5rem;
    border-radius: 12px;
    background: white;
    border: 2px solid var(--border-color);
    min-width: 120px;
}

.contact-link:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
    border-color: var(--primary-color);
}

.contact-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 0.8rem;
    transition: all 0.3s ease;
}

.contact-link:hover .contact-icon {
    color: var(--secondary-color);
    transform: scale(1.1);
}

.contact-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--secondary-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.contact-value {
    font-size: 0.8rem;
    color: var(--text-light);
    margin-top: 0.3rem;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    padding: 0.6rem 1.5rem;
    font-weight: 500;
    transition: all 0.3s ease;
    border-radius: 4px;
}

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

.btn-outline-primary {
    color: var(--primary-color);
    border-color: var(--primary-color);
    padding: 0.6rem 1.5rem;
    font-weight: 500;
    border-radius: 4px;
}

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

.timeline {
    position: relative;
    padding: 2rem 0;
}

.timeline-item {
    position: relative;
    padding: 1.5rem 0;
    border-left: 2px solid var(--border-color);
    margin-left: 2rem;
    padding-left: 2rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -8px;
    top: 2rem;
    width: 14px;
    height: 14px;
    background-color: var(--primary-color);
    border-radius: 50%;
}

.timeline-date {
    color: var(--text-light);
    font-size: 0.9rem;
    font-weight: 600;
}

.timeline-title {
    color: var(--primary-color);
    font-weight: 600;
    margin: 0.5rem 0;
}

.timeline-institution {
    color: var(--primary-color);
    font-weight: 500;
}

.publication-item {
    padding: 1.5rem;
    border-left: 4px solid var(--primary-color);
    background-color: var(--bg-light);
    margin-bottom: 1.5rem;
    border-radius: 0 4px 4px 0;
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--primary-color);
}

.publication-title {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.publication-authors {
    color: var(--secondary-color);
    font-style: italic;
    margin-bottom: 0.5rem;
}

.publication-venue {
    color: var(--primary-color);
    font-weight: 500;
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Offset for fixed navbar */
.section {
    scroll-margin-top: 80px;
}

@media (max-width: 768px) {
    .intro-content {
        flex-direction: column;
        text-align: center;
        gap: 2rem;
    }
    
    .intro-image {
        flex: none;
        max-width: 250px;
        margin: 0 auto;
    }
    
    .intro-image img {
        height: 300px;
    }
    
    .intro-title {
        font-size: 2.5rem;
    }
    
    .intro-subtitle {
        font-size: 1.1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .contact-info {
        text-align: center;
    }
    
    .contact-links {
        gap: 1rem;
    }
    
    .contact-link {
        min-width: 100px;
        padding: 1.2rem;
    }
    
    .contact-icon {
        font-size: 2rem;
    }
}