/* Professional Academic Website Enhancements */

/* Enhanced Typography */
body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.6;
}

/* Professional Header Styling */
header {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    color: #1e3a8a;
}

header .intro-text .name {
    color: #1e3a8a;
    font-weight: 600;
    font-size: 3.2em;
}

header .intro-text .skills {
    color: #475569;
    font-weight: 400;
    font-size: 1.3em;
    letter-spacing: 1px;
}

/* Professional Image Styling */
header img {
    border-radius: 50%;
    border: 5px solid #ffffff;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    max-width: 250px;
    transition: transform 0.3s ease;
}

header img:hover {
    transform: scale(1.05);
}

/* Enhanced About Section */
section.success {
    background: linear-gradient(135deg, #1e3a8a 0%, #3730a3 100%);
    color: #ffffff;
}

/* Professional Navigation */
.navbar-default {
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(30, 58, 138, 0.1);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.navbar-brand {
    font-weight: 600 !important;
    color: #1e3a8a !important;
}

.navbar-nav > li > a {
    font-weight: 500;
    color: #1e3a8a !important;
    transition: color 0.3s ease;
}

.navbar-nav > li > a:hover {
    color: #1e40af !important;
}

/* Enhanced Portfolio Grid */
.portfolio-flex-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
    margin-bottom: 40px;
}

.portfolio-flex-item {
    flex: 0 0 calc(45% - 15px);
    max-width: 400px;
}

.portfolio-item {
    background: #ffffff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.portfolio-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.portfolio-item img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

/* Professional Cards */
.professional-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 8px;
    padding: 25px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

/* Publication Enhancements */
.publication-item {
    transition: all 0.3s ease;
}

.publication-item:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

/* Professional Button Styling */
.btn-primary {
    background-color: #1e3a8a;
    border-color: #1e3a8a;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background-color: #1e40af;
    border-color: #1e40af;
    transform: translateY(-2px);
}

/* Enhanced Star Dividers */
hr.star-primary {
    border-top-color: #1e3a8a;
}

hr.star-primary:after {
    background-color: #1e3a8a;
    color: #ffffff;
}

/* Enhanced Modal Styling */
.modal-content {
    border-radius: 12px;
    border: none;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.modal-body {
    padding: 40px !important;
}

/* Professional Loading Animation */
.portfolio-item .caption {
    background-color: rgba(30, 58, 138, 0.9);
    backdrop-filter: blur(5px);
}

/* Enhanced Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Montserrat', 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

/* Professional Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #1e3a8a;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #1e40af;
}

/* Smooth Animations */
* {
    transition: all 0.3s ease;
}

/* Professional Focus States */
a:focus, button:focus, input:focus, textarea:focus {
    outline: 2px solid #1e3a8a;
    outline-offset: 2px;
}

/* Enhanced Navigation */
.navbar-fixed-top {
    transition: all 0.3s ease;
}

.navbar.shrink {
    padding: 5px 0;
    background-color: rgba(255, 255, 255, 0.95) !important;
}

/* Print Styles */
@media print {
    .navbar, footer, .scroll-top {
        display: none;
    }
    
    section {
        page-break-inside: avoid;
        padding: 20px 0;
    }
    
    .container {
        width: 100% !important;
        max-width: none;
    }
}

/* Professional Animation Delays */
.portfolio-item:nth-child(1) { animation-delay: 0.1s; }
.portfolio-item:nth-child(2) { animation-delay: 0.2s; }
.portfolio-item:nth-child(3) { animation-delay: 0.3s; }
.portfolio-item:nth-child(4) { animation-delay: 0.4s; }

/* Enhanced Accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border: 0;
}

/* Professional Color Scheme Variables */
:root {
    --primary-color: #1e3a8a;
    --secondary-color: #3730a3;
    --accent-color: #16a085;
    --text-color: #333333;
    --light-gray: #f8f9fa;
    --medium-gray: #e5e7eb;
    --dark-gray: #374151;
}

/* Mobile-First Responsive Design */
@media (max-width: 576px) {
    .portfolio-flex-item {
        flex: 0 0 100%;
        margin-bottom: 20px;
    }
    
    header .intro-text .name {
        font-size: 2.2em;
    }
    
    .modal-body {
        padding: 20px !important;
    }
    
    section {
        padding: 40px 0;
    }
}

@media (max-width: 768px) {
    .navbar-nav {
        margin-top: 10px;
    }
    
    .navbar-nav > li {
        margin-bottom: 5px;
    }
}

/* Professional Button Hover Effects */
.btn {
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

/* Section Spacing */
section {
    padding: 80px 0;
}

/* Typography Improvements */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
}

p {
    font-size: 18px;
    line-height: 1.7;
}

/* Professional Link Styling */
a {
    transition: color 0.3s ease;
}

a:hover {
    text-decoration: none;
}