/* Modern Styling Improvements */

/* Color Variables */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --text-color: #2c3e50;
    --light-gray: #f8f9fa;
    --border-color: #e9ecef;
    --success-color: #2ecc71;
    --warning-color: #f39c12;
}

/* Typography Improvements */
body {
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-color);
    font-family: 'Montserrat', sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

/* Navigation Improvements */
.navbar {
    background-color: var(--primary-color);
    border: none;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    padding: 15px 0;
}

.navbar .navbar-brand {
    color: white;
    font-size: 1.5rem;
    font-weight: 600;
    padding: 15px;
    letter-spacing: -0.02em;
}

.navbar .navbar-nav>li>a {
    color: rgba(255,255,255,0.9);
    font-size: 1.1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 15px 20px;
    letter-spacing: 0.02em;
}

.navbar .navbar-nav>li>a:hover {
    color: white;
    background-color: rgba(255,255,255,0.1);
}

/* Intro Section Improvements */
.intro-section {
    background-color: var(--light-gray);
    padding: 150px 0 50px 0;
    position: relative;
    overflow: hidden;
}

.intro-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.1) 0%, rgba(46, 204, 113, 0.1) 100%);
    z-index: 0;
}

.intro-section img {
    max-width: 250px;
    border: 5px solid white;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.intro-section img:hover {
    transform: scale(1.02);
}

.intro-section h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    position: relative;
}

.intro-section .lead {
    font-size: 1.25rem;
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.intro-section address {
    font-style: normal;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.intro-section .social-links {
    margin-top: 2rem;
}

.intro-section .social-links .btn {
    margin-right: 1rem;
    margin-bottom: 1rem;
    padding: 10px 20px;
    border-radius: 4px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.intro-section .social-links .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

/* Section Improvements */
.section-title {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 40px;
    position: relative;
    padding-bottom: 15px;
    text-align: center;
}

.section-title:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: var(--secondary-color);
}

/* Publication Card Improvements */
.list-group-item {
    border: none;
    margin-bottom: 30px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
    padding: 25px;
    border-radius: 8px;
    background-color: white;
}

.list-group-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.list-group-item-heading {
    color: var(--primary-color);
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 15px;
    line-height: 1.4;
}

.list-group-item img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    margin-bottom: 15px;
    transition: transform 0.3s ease;
}

.list-group-item img:hover {
    transform: scale(1.02);
}

/* Button Improvements */
.btn {
    border-radius: 4px;
    padding: 8px 16px;
    font-weight: 500;
    transition: all 0.3s ease;
    letter-spacing: 0.02em;
}

.btn-success {
    background-color: var(--success-color);
    border-color: var(--success-color);
}

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

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

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

/* Footer Improvements */
.footer {
    background-color: var(--primary-color);
    color: white;
    padding: 40px 0;
    margin-top: 60px;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--secondary-color), var(--success-color));
}

.footer .text-muted {
    color: rgba(255,255,255,0.8) !important;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.intro-section, .about-section, .news-section, .publications-section {
    animation: fadeIn 0.8s ease-out;
}

/* Responsive Improvements */
@media (max-width: 767px) {
    .intro-section {
        padding: 100px 0 30px 0;
        text-align: center;
    }
    
    .intro-section img {
        margin-bottom: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .navbar {
        padding: 10px 0;
    }
    
    .list-group-item {
        padding: 20px;
    }
    
    .btn {
        margin-bottom: 10px;
    }
}

/* Container Widths */
.container {
    max-width: 1200px;
    padding: 0 20px;
}

@media (min-width: 1200px) {
    .container {
        width: 85%;
    }
}

/* Publication Section Improvements */
.publications-section {
    padding: 80px 0;
    background-color: var(--light-gray);
}

.publications-list {
    margin-top: 30px;
}

.publications-list .list-group {
    margin-bottom: 0;
}

.publications-list .list-group-item {
    margin-bottom: 30px;
    border: none;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
    padding: 25px;
    border-radius: 8px;
    background-color: white;
}

.publications-list .list-group-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.publications-list .list-group-item img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    margin-bottom: 15px;
    transition: transform 0.3s ease;
}

.publications-list .list-group-item-heading {
    color: var(--primary-color);
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 15px;
    line-height: 1.4;
}

.publications-list .detail {
    color: var(--text-color);
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: 15px;
}

.publications-list .abstract {
    background-color: var(--light-gray);
    padding: 20px;
    border-radius: 4px;
    margin-top: 15px;
    font-size: 0.95rem;
    line-height: 1.6;
    border-left: 4px solid var(--secondary-color);
}

.publications-list .citation {
    background-color: var(--light-gray);
    padding: 20px;
    border-radius: 4px;
    margin-top: 15px;
    font-size: 0.9rem;
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
    border-left: 4px solid var(--warning-color);
}

.publications-list .btn {
    margin-right: 10px;
    margin-bottom: 10px;
    padding: 8px 16px;
    font-size: 0.9rem;
}

.publications-list .btn i {
    margin-right: 5px;
}

@media (max-width: 767px) {
    .publications-list .list-group-item {
        padding: 20px;
    }
    
    .publications-list .list-group-item img {
        margin-bottom: 10px;
    }
    
    .publications-list .btn {
        width: 100%;
        margin-bottom: 10px;
    }
}

/* Research Interests Section */
.research-section {
    padding: 80px 0;
    background-color: white;
}

.research-interests {
    list-style-type: none;
    padding-left: 0;
    margin-top: 20px;
}

.research-interests li {
    margin-bottom: 25px;
    padding-left: 20px;
    position: relative;
    line-height: 1.6;
    color: var(--text-color);
}

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

.research-interests li strong {
    color: var(--primary-color);
    font-weight: 600;
    display: block;
    margin-bottom: 5px;
}

@media (max-width: 767px) {
    .research-section {
        padding: 60px 0;
    }
    
    .research-interests li {
        margin-bottom: 20px;
    }
}