/* Global Styles */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --info-color: #17a2b8;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --white-color: #ffffff;
    --body-bg: #f8f9fa;
    --card-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --card-shadow-hover: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
}

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

body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: var(--body-bg);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 500;
    margin-bottom: 1rem;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--dark-color);
    position: relative;
    padding-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--info-color));
    border-radius: 2px;
}

/* Navigation */
.navbar {
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
}

.nav-link {
    font-weight: 500;
    transition: color 0.3s ease;
}

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

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 120px 0 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.hero .container {
    position: relative;
    z-index: 2;
}

.profile-img {
    width: 200px;
    height: 200px;
    object-fit: cover;
    border: 5px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease;
}

.profile-img:hover {
    transform: scale(1.05);
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero .lead {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    opacity: 0.9;
}

.social-links {
    margin: 2rem 0;
}

.social-links a {
    display: inline-block;
    width: 50px;
    height: 50px;
    line-height: 50px;
    text-align: center;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    margin: 0 10px;
    transition: all 0.3s ease;
    text-decoration: none;
    font-size: 1.2rem;
}

.social-links a:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

/* Cards */
.card {
    border: none;
    border-radius: 15px;
    box-shadow: var(--card-shadow);
    transition: all 0.3s ease;
    overflow: hidden;
}

.card:hover {
    box-shadow: var(--card-shadow-hover);
    transform: translateY(-5px);
}

.card-header {
    background: linear-gradient(135deg, var(--primary-color), var(--info-color));
    color: white;
    border: none;
    padding: 1.5rem;
}

.card-body {
    padding: 2rem;
}

/* Timeline */
.timeline .card {
    margin-bottom: 2rem;
    border-left: 4px solid var(--primary-color);
}

.timeline .card:last-child {
    margin-bottom: 0;
}

/* Skills */
.skills-section {
    background: var(--light-color);
}

.skill-category {
    margin-bottom: 2rem;
}

.skill-category h5 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-weight: 600;
}

.skill-category ul {
    list-style: none;
    padding-left: 0;
}

.skill-category li {
    padding: 0.5rem 0;
    border-bottom: 1px solid #eee;
    position: relative;
    padding-left: 1.5rem;
}

.skill-category li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.skill-category li:last-child {
    border-bottom: none;
}

/* Publications */
.publication-item {
    padding: 1.5rem;
    border: 1px solid #e9ecef;
    border-radius: 10px;
    margin-bottom: 1.5rem;
    background: white;
    transition: all 0.3s ease;
}

.publication-item:hover {
    box-shadow: var(--card-shadow-hover);
    border-color: var(--primary-color);
}

.publication-item h5 {
    color: var(--dark-color);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.publication-item p {
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

/* Gallery */
.gallery-item {
    transition: all 0.3s ease;
    cursor: pointer;
}

.gallery-item:hover {
    transform: scale(1.02);
}

.gallery-item img {
    height: 200px;
    object-fit: cover;
}

/* Contact Form */
.contact-info p {
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
}

.contact-info i {
    width: 20px;
    margin-right: 10px;
    color: var(--primary-color);
}

.contact-info a {
    color: var(--primary-color);
    text-decoration: none;
}

.contact-info a:hover {
    text-decoration: underline;
}

.form-control {
    border-radius: 10px;
    border: 2px solid #e9ecef;
    padding: 0.75rem 1rem;
    transition: all 0.3s ease;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

.btn {
    border-radius: 25px;
    padding: 0.75rem 2rem;
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--info-color));
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 123, 255, 0.4);
}

.btn-outline-primary {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

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

/* Footer */
footer {
    background: var(--dark-color);
    color: white;
    text-align: center;
    padding: 2rem 0;
}

footer .social-links a {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

footer .social-links a:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero .lead {
        font-size: 1.2rem;
    }
    
    .profile-img {
        width: 150px;
        height: 150px;
    }
    
    .card-body {
        padding: 1.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 576px) {
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .social-links a {
        width: 40px;
        height: 40px;
        line-height: 40px;
        font-size: 1rem;
        margin: 0 5px;
    }
    
    .btn {
        padding: 0.5rem 1.5rem;
        font-size: 0.9rem;
    }
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

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

/* Loading animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Success/Error messages */
.alert {
    border-radius: 10px;
    border: none;
    padding: 1rem 1.5rem;
}

.alert-success {
    background: linear-gradient(135deg, var(--success-color), #20c997);
    color: white;
}

.alert-danger {
    background: linear-gradient(135deg, var(--danger-color), #e74c3c);
    color: white;
}

/* Badge styling */
.badge {
    font-size: 0.8rem;
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

/* Award items */
.award-item {
    padding: 1rem;
    border: 1px solid #e9ecef;
    border-radius: 10px;
    background: white;
    transition: all 0.3s ease;
}

.award-item:hover {
    box-shadow: var(--card-shadow);
    border-color: var(--primary-color);
}

.award-item h6 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

/* Gallery grid improvements */
.gallery-item .card-body {
    padding: 1rem;
}

.gallery-item .card-title {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.gallery-item .card-text {
    font-size: 0.9rem;
    color: var(--secondary-color);
}

/* Print styles */
@media print {
    .navbar,
    .social-links,
    .btn,
    footer {
        display: none !important;
    }
    
    .hero {
        background: white !important;
        color: black !important;
        padding: 20px 0 !important;
    }
    
    .card {
        box-shadow: none !important;
        border: 1px solid #ddd !important;
    }
}