/* Global Styles */
:root {
    --primary-color: #0066cc;
    --secondary-color: #333;
    --accent-color: #28a745;
    --light-gray: #f8f9fa;
    --border-color: #dee2e6;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #ffffff;
}

/* Navigation */
.navbar {
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.navbar-brand {
    font-size: 1.3rem;
    font-weight: 700;
    color: #ffffff !important;
    letter-spacing: 0.5px;
}

.nav-link {
    position: relative;
    transition: color 0.3s ease;
    margin-right: 1rem;
}

.nav-link:after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

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

/* Hero Section */
.hero-section {
    padding: 60px 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    margin-bottom: 60px;
}

.profile-image {
    width: 280px;
    height: 280px;
    object-fit: cover;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    border: 5px solid #ffffff;
    transition: transform 0.3s ease;
}

.profile-image:hover {
    transform: translateY(-5px);
}

.hero-section h1 {
    color: var(--secondary-color);
    margin-bottom: 10px;
    font-weight: 800;
}

.hero-section h2 {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 20px;
}

.buttons-group {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.btn {
    border-radius: 5px;
    padding: 12px 30px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid var(--primary-color);
}

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

.btn-primary:hover {
    background-color: #0052a3;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,102,204,0.3);
}

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

.btn-outline-primary:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

/* Section Titles */
.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--secondary-color);
    margin-bottom: 50px;
    text-align: center;
    position: relative;
    padding-bottom: 20px;
}

.section-title:after {
    content: '';
    position: absolute;
    width: 80px;
    height: 4px;
    background-color: var(--primary-color);
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 2px;
}

/* Research Interests Section */
.research-interests-section {
    padding: 80px 0;
    background-color: #ffffff;
    margin-bottom: 60px;
}

.interest-card {
    background: #f8f9fa;
    padding: 40px 25px;
    border-radius: 10px;
    text-align: center;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    height: 100%;
}

.interest-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.1);
    border-color: var(--primary-color);
    background-color: #ffffff;
}

.icon-box {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.interest-card h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--secondary-color);
}

.interest-card p {
    color: #666;
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Featured Work Section */
.featured-work-section {
    padding: 80px 0;
    background-color: var(--light-gray);
    margin-bottom: 60px;
}

.work-card {
    background: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    transition: all 0.3s ease;
    height: 100%;
    border-left: 5px solid var(--primary-color);
}

.work-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.15);
}

.work-header {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}

.work-header i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-right: 15px;
}

.work-header h3 {
    margin: 0;
    color: var(--secondary-color);
    font-weight: 700;
}

.work-card p {
    color: #666;
    line-height: 1.7;
    margin-bottom: 20px;
}

/* Stats Section */
.stats-section {
    padding: 80px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    margin-bottom: 60px;
}

.stat-box {
    padding: 40px 20px;
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 10px;
}

.stat-label {
    font-size: 1.1rem;
    font-weight: 600;
    opacity: 0.95;
}

/* Footer */
.footer {
    background-color: var(--secondary-color);
    color: white;
    padding: 50px 0 20px 0;
    margin-top: 80px;
}

.footer h4 {
    font-weight: 700;
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.footer p {
    margin: 0;
}

.social-links {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 20px;
}

.social-links a {
    width: 40px;
    height: 40px;
    background-color: rgba(255,255,255,0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: all 0.3s ease;
    font-size: 1.1rem;
}

.social-links a:hover {
    background-color: var(--primary-color);
    transform: translateY(-3px);
}

.footer hr {
    border-color: rgba(255,255,255,0.1);
    margin: 30px 0;
}

.footer small {
    font-size: 0.9rem;
}

/* Page Header */
.page-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 60px 0 50px 0;
    margin-bottom: 40px;
}

.page-header h1 {
    color: white;
    font-weight: 800;
}

.page-header .lead {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.2rem;
}

/* Page Content */
.page-section {
    padding: 60px 0;
}

.content-box {
    background-color: var(--light-gray);
    padding: 40px;
    border-radius: 10px;
    border-left: 5px solid var(--primary-color);
    margin-bottom: 30px;
}

.cv-section {
    margin-bottom: 50px;
}

.cv-section h3 {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.4rem;
    margin-top: 30px;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}

.cv-item {
    background: white;
    padding: 25px;
    margin-bottom: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}

.cv-item:hover {
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transform: translateX(5px);
}

.cv-item-title {
    font-weight: 700;
    color: var(--secondary-color);
    font-size: 1.1rem;
}

.cv-item-subtitle {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.95rem;
    margin: 5px 0;
}

.cv-item-date {
    color: #999;
    font-size: 0.9rem;
    margin-bottom: 10px;
}

/* Publications/Work List */
.pub-card {
    background: white;
    padding: 30px;
    border-radius: 10px;
    margin-bottom: 25px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.08);
    border-left: 4px solid var(--accent-color);
    transition: all 0.3s ease;
}

.pub-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.12);
}

.pub-card h4 {
    color: var(--secondary-color);
    font-weight: 700;
    margin-bottom: 10px;
}

.pub-card p {
    color: #666;
    line-height: 1.7;
    margin-bottom: 15px;
}

.pub-category {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 15px;
}

/* Contact Form */
.form-group {
    margin-bottom: 25px;
}

.form-label {
    font-weight: 600;
    color: var(--secondary-color);
    margin-bottom: 8px;
}

.form-control {
    border-radius: 5px;
    border: 1px solid var(--border-color);
    padding: 12px 15px;
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(0,102,204,0.25);
}

/* Responsive */
@media (max-width: 768px) {
    .hero-section {
        padding: 40px 0;
    }

    .profile-image {
        width: 220px;
        height: 220px;
    }

    .buttons-group {
        flex-direction: column;
    }

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

    .interest-card {
        margin-bottom: 20px;
    }

    .social-links {
        justify-content: flex-start;
    }

    .footer {
        text-align: center;
    }

    .footer .col-md-4 {
        text-align: center;
        margin-top: 20px;
    }

    .social-links {
        justify-content: center;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .footer,
    .buttons-group {
        display: none;
    }

    body {
        background-color: white;
    }

    .content-box {
        box-shadow: none;
        border: 1px solid var(--border-color);
    }
}