/* Global Styles */
:root {
    --primary-color: #1a5f7a;
    --secondary-color: #57c5b6;
    --accent-color: #159895;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --gray-color: #6c757d;
    --light-gray: #e9ecef;
    --white-color: #ffffff;
    --border-radius: 0.375rem;
    --box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    --transition: all 0.3s ease-in-out;
}

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

h1, h2, h3, h4, h5, h6 {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    color: var(--primary-color);
}

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

a:hover {
    color: var(--accent-color);
}

.section-title {
    position: relative;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    text-align: center;
    color: var(--primary-color);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: var(--secondary-color);
}

.section-subtitle {
    text-align: center;
    color: var(--gray-color);
    margin-bottom: 2rem;
}

/* Top Bar */
.top-bar {
    background-color: var(--primary-color);
    color: var(--white-color);
    font-size: 0.875rem;
}

.metrics-bar .badge {
    font-weight: 500;
}

/* Header */
.journal-title {
    font-size: 1.75rem;
    margin-bottom: 0;
    color: var(--primary-color);
}

.journal-subtitle {
    font-size: 1.25rem;
    color: var(--gray-color);
}

/* Navigation */
.navbar {
    background-color: var(--primary-color);
    padding: 0;
}

.navbar-nav .nav-link {
    color: var(--white-color);
    padding: 1rem 1.25rem;
    font-weight: 500;
    transition: var(--transition);
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
    background-color: var(--accent-color);
}

.dropdown-menu {
    border: none;
    border-radius: 0;
    box-shadow: var(--box-shadow);
}

.dropdown-item {
    padding: 0.75rem 1.5rem;
    transition: var(--transition);
}

.dropdown-item:hover {
    background-color: var(--light-gray);
}

.search-btn {
    color: var(--white-color);
    background-color: transparent;
    border: none;
}

.search-btn:hover {
    color: var(--secondary-color);
}

/* Hero Section */
.hero-section {
    background-color: var(--primary-color);
    color: var(--white-color);
    padding: 5rem 0;
    position: relative;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: linear-gradient(135deg, rgba(26, 95, 122, 0.9) 0%, rgba(21, 152, 149, 0.8) 100%);
    z-index: 1;
}

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

/* Metrics Section */
.metrics-section {
    background-color: var(--white-color);
}

.metric-card {
    background-color: var(--white-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    text-align: center;
    box-shadow: var(--box-shadow);
    height: 100%;
    transition: var(--transition);
}

.metric-card:hover {
    transform: translateY(-5px);
}

.metric-icon {
    font-size: 2.5rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.metric-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0;
}

.metric-year {
    color: var(--gray-color);
    font-size: 0.875rem;
}

/* Current Issue Section */
.current-issue-section {
    background-color: var(--light-color);
}

.issue-info {
    text-align: center;
    margin-bottom: 2rem;
}

.article-card {
    background-color: var(--white-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--box-shadow);
    height: 100%;
    transition: var(--transition);
}

.article-card:hover {
    transform: translateY(-5px);
}

.article-type {
    display: inline-block;
    background-color: var(--secondary-color);
    color: var(--white-color);
    font-size: 0.75rem;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    margin-bottom: 0.75rem;
}

.article-title {
    font-size: 1.125rem;
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.article-authors {
    font-size: 0.875rem;
    color: var(--gray-color);
    margin-bottom: 0.75rem;
}

.article-metrics {
    display: flex;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--gray-color);
    margin-bottom: 0.5rem;
}

.article-doi {
    font-size: 0.875rem;
    color: var(--gray-color);
    margin-bottom: 0.75rem;
}

/* Featured Articles Section */
.featured-articles-section {
    background-color: var(--white-color);
}

.featured-article {
    background-color: var(--white-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    height: 100%;
    transition: var(--transition);
}

.featured-article:hover {
    transform: translateY(-5px);
}

.featured-article-body {
    padding: 1.5rem;
}

.featured-article-title {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.featured-article-authors {
    font-size: 0.875rem;
    color: var(--gray-color);
    margin-bottom: 0.75rem;
}

/* Announcements Section */
.announcements-section {
    background-color: var(--light-color);
}

.announcement-item {
    background-color: var(--white-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--box-shadow);
}

.announcement-date {
    font-size: 0.875rem;
    color: var(--gray-color);
    margin-bottom: 0.5rem;
}

.conference-item {
    display: flex;
    background-color: var(--white-color);
    border-radius: var(--border-radius);
    margin-bottom: 1.5rem;
    box-shadow: var(--box-shadow);
    overflow: hidden;
}

.conference-date {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: var(--primary-color);
    color: var(--white-color);
    padding: 1rem;
    min-width: 80px;
    text-align: center;
}

.conference-date .month {
    font-size: 0.875rem;
    text-transform: uppercase;
}

.conference-date .day {
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1;
}

.conference-date .year {
    font-size: 0.875rem;
}

.conference-details {
    padding: 1rem;
    flex-grow: 1;
}

.conference-details h5 {
    margin-bottom: 0.5rem;
    font-size: 1.125rem;
}

.conference-details p {
    color: var(--gray-color);
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

/* Indexing Section */
.indexing-section {
    background-color: var(--white-color);
}

.indexing-logo {
    max-height: 60px;
    filter: grayscale(100%);
    opacity: 0.7;
    transition: var(--transition);
}

.indexing-logo:hover {
    filter: grayscale(0);
    opacity: 1;
}

/* Newsletter Section */
.newsletter-section {
    background-color: var(--primary-color);
    color: var(--white-color);
}

.newsletter-section .section-title {
    color: var(--white-color);
}

.newsletter-section .section-title::after {
    background-color: var(--white-color);
}

.newsletter-section .section-subtitle {
    color: rgba(255, 255, 255, 0.8);
}

.newsletter-form .form-control {
    border: none;
    padding: 0.75rem 1.25rem;
    height: auto;
}

.newsletter-form .form-check-label {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.8);
}

/* Footer */
.footer {
    background-color: var(--dark-color);
    color: rgba(255, 255, 255, 0.8);
    padding: 4rem 0 2rem;
}

.footer-logo {
    max-height: 60px;
}

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

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--white-color);
    border-radius: 50%;
    transition: var(--transition);
}

.social-link:hover {
    background-color: var(--secondary-color);
    color: var(--white-color);
}

.footer-heading {
    color: var(--white-color);
    margin-bottom: 1.25rem;
    font-size: 1.125rem;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--secondary-color);
}

.footer-divider {
    border-color: rgba(255, 255, 255, 0.1);
    margin: 2rem 0;
}

.copyright {
    font-size: 0.875rem;
    margin-bottom: 0;
}

.footer-bottom-links {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: flex-end;
    gap: 1.5rem;
}

.footer-bottom-links a {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.8);
}

.display-4{
    color:#fff;
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 40px;
    height: 40px;
    background-color: var(--primary-color);
    color: var(--white-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 1000;
    box-shadow: var(--box-shadow);
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: var(--accent-color);
    color: var(--white-color);
}

/* Responsive Styles */
@media (max-width: 991.98px) {
    .journal-title {
        font-size: 1.5rem;
    }
    
    .journal-subtitle {
        font-size: 1rem;
    }
    
    .hero-section {
        padding: 3rem 0;
    }
}

@media (max-width: 767.98px) {
    .top-bar .col-md-6:first-child {
        margin-bottom: 0.5rem;
    }
    
    .top-bar .text-end {
        text-align: left !important;
    }
    
    .footer-bottom-links {
        justify-content: flex-start;
        margin-top: 1rem;
    }
}

@media (max-width: 575.98px) {
    .metrics-bar {
        display: flex;
        flex-wrap: wrap;
        gap: 0.5rem;
    }
    
    .hero-section {
        padding: 2rem 0;
    }
    
    .hero-section h2 {
        font-size: 1.75rem;
    }
}