:root {
    --primary-blue: #1950c7;
    --light-blue: #60a5fa;
    --dark-blue: #0a298f;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --text-dark: #1e293b;
    --text-gray: #64748b;
    --border-light: #e2e8f0;
    --link-color: #1950c7;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--text-dark);
    background-color: var(--bg-light);
    line-height: 1.5;
}

a {
    color: var(--link-color);
    text-decoration: none;
}

/* Sidebar Styles */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: 280px;
    background-color: var(--bg-white);
    border-right: 1px solid var(--border-light);
    padding: 2rem 1.5rem;
    overflow-y: auto;
    box-shadow: 2px 0 10px rgba(0,0,0,0.05);
    z-index: 1000;
    transition: transform 0.3s ease;
}

.sidebar .profile-photo {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--primary-blue);
    margin-bottom: 1.5rem;
}

.sidebar h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.sidebar .subtitle {
    color: var(--text-gray);
    font-size: 0.95rem;
    margin-bottom: 2rem;
}

.sidebar nav {
    margin-bottom: 2rem;
}

.sidebar nav a {
    display: block;
    padding: 0.6rem 1.2rem;
    color: var(--text-dark);
    text-decoration: none;
    border-radius: 8px;
    margin: 0.3rem;
    transition: all 0.3s ease;
    font-weight: 500;
}

.sidebar nav a:hover,
.sidebar nav a.active {
    background-color: var(--primary-blue);
    color: white;
}

.social-links {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.social-links a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-gray);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.3s ease;
}

.social-links a:hover {
    color: var(--primary-blue);
}

.social-links i {
    width: 20px;
    font-size: 1.2rem;
}

/* Mobile Menu Toggle Button */
.mobile-menu-toggle {
    display: none;
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 1001;
    background-color: var(--primary-blue);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 0.5rem 0.75rem;
    font-size: 1.2rem;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    transition: background-color 0.3s ease;
}

.mobile-menu-toggle:hover {
    background-color: var(--dark-blue);
}

.mobile-menu-toggle i {
    pointer-events: none;
}

/* Main Content Styles */
.main-content {
    margin-left: 280px;
    padding: 3rem 4rem;
    max-width: 1200px;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.section {
    background-color: var(--bg-white);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.section-title {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 3px solid var(--primary-blue);
    display: inline-block;
}

.subsection-title {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 1.5rem;
    margin-top: 1rem;
}

/* News Styles */
.news-item {
    padding: 0.75rem 1rem;
    margin-bottom: 1.2rem;
    background-color: var(--bg-light);
    border-left: 4px solid var(--primary-blue);
    border-radius: 6px;
}

.news-item:last-child {
    margin-bottom: 0;
}

.news-date {
    color: var(--primary-blue);
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.2rem;
}

.news-content {
    color: var(--text-dark);
    margin: 0;
}

/* Publication Styles */
.publication-item {
    margin-bottom: 1.25rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-light);
}

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

.publication-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.4rem;
}

.publication-authors {
    font-size: 0.9rem;
    color: var(--text-gray);
    margin-bottom: 0.2rem;
}

.publication-venue {
    font-size: 0.9rem;
    color: var(--text-gray);
    margin-bottom: 1rem;
}

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

.pub-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.7rem;
    background-color: var(--bg-light);
    color: var(--text-dark);
    text-decoration: none;
    border-radius: 6px;
    font-size: 0.85rem;
    transition: all 0.3s ease;
    border: 1px solid var(--border-light);
}

.pub-link:hover {
    background-color: var(--primary-blue);
    color: white;
    border-color: var(--primary-blue);
}

/* Project Styles */
.project-item {
    margin-bottom: 2.5rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-light);
}

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

.project-logo {
    max-width: 120px;
    height: auto;
    border-radius: 8px;
}

.project-name {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: 0.25rem;
}

.project-full-name {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-gray);
    margin-bottom: 0.75rem;
}

.project-funding {
    font-size: 0.9rem;
    color: var(--text-gray);
    margin-bottom: 0.75rem;
}

.project-description {
    color: var(--text-dark);
    margin-bottom: 1rem;
}

/* Position and Education Items */
.position-item,
.education-item {
    margin-bottom: 0.75rem;
}

.position-item:last-child,
.education-item:last-child {
    margin-bottom: 0;
}

/* Button Styles */
.btn-primary {
    background-color: var(--primary-blue);
    border-color: var(--primary-blue);
    padding: 0.45rem 1.2rem;
    font-weight: 500;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background-color: var(--dark-blue);
    border-color: var(--dark-blue);
    transform: translateY(-2px);
}

/* Footer Styles */
.footer {
    margin-left: 280px;
    padding: 1.2rem 3rem;
    text-align: center;
    color: var(--text-gray);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-light);
}

.footer a {
    color: var(--primary-blue);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

/* Responsive Design */

/* Medium devices (tablets, 768px to 991px) */
@media (max-width: 991px) {
    .footer {
        margin-left: 240px;
        padding: 1.5rem 2.5rem;
    }

    .sidebar {
        width: 240px;
        padding: 1.5rem 1rem;
    }

    .sidebar .profile-photo {
        width: 140px;
        height: 140px;
    }

    .sidebar h3 {
        font-size: 1.3rem;
    }

    .sidebar .subtitle {
        font-size: 0.85rem;
    }

    .sidebar nav a {
        padding: 0.6rem 0.8rem;
        font-size: 0.9rem;
    }

    .social-links a {
        font-size: 0.85rem;
    }

    .social-links i {
        font-size: 1rem;
    }

    .main-content {
        margin-left: 240px;
        padding: 2rem 2.5rem;
    }

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

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

/* Small devices (mobile, below 768px) */
@media (max-width: 767px) {
    .footer {
        margin-left: 0;
        padding: 1.5rem;
    }
    
    .mobile-menu-toggle {
        display: block;
    }

    .sidebar {
        transform: translateX(-100%);
        width: 280px;
        padding: 5rem 1.5rem 2rem;
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
        padding: 5rem 1.5rem 2rem;
    }

    .page-title {
        font-size: 1.8rem;
    }

    .section {
        padding: 1.5rem;
    }

    .section-title {
        font-size: 1.4rem;
    }

    .subsection-title {
        font-size: 1.2rem;
    }

    .publication-links {
        flex-direction: column;
        gap: 0.5rem;
    }

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

    .project-logo {
        max-width: 100px;
    }

    .project-name {
        font-size: 1.1rem;
    }
}

/* Extra small devices (below 576px) */
@media (max-width: 575px) {
    .main-content {
        padding: 4.5rem 1rem 1.5rem;
    }

    .page-title {
        font-size: 1.5rem;
    }

    .section {
        padding: 1.25rem;
    }

    .section-title {
        font-size: 1.2rem;
    }

    .project-logo {
        max-width: 80px;
    }
}