/* ===========================
   DOI Portal - Public Theme
   Design System: doi.rs brand
   =========================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
    /* Brand */
    --color-primary:        #5cb46a;
    --color-primary-light:  #68cc6c;
    --color-dark:           #033333;
    --color-darker:         #062727;

    /* Text */
    --color-text-primary:   #212121;
    --color-text-secondary: #728383;
    --color-text-on-dark:   #ffffff;
    --color-text-muted-dark: rgba(255, 255, 255, 0.6);

    /* Surfaces */
    --color-surface-base:   #f9f9ff;
    --color-surface-card:   #ffffff;

    /* Borders */
    --color-border:         #e2e8f0;
    --color-border-subtle:  #ededed;

    /* Bootstrap override */
    --bs-primary:           #5cb46a;
    --bs-primary-rgb:       92, 180, 106;
    --bs-link-color:        #5cb46a;
    --bs-link-hover-color:  #68cc6c;
    --bs-body-bg:           #f9f9ff;

    /* Legacy aliases for existing classes */
    --portal-primary: #033333;
    --portal-secondary: #5cb46a;
    --portal-secondary-hover: #68cc6c;
    --portal-text: #212121;
    --portal-text-muted: #728383;
    --portal-bg: #ffffff;
    --portal-bg-secondary: #f9f9ff;
    --portal-border: #e2e8f0;
}

/* ===========================
   Global Typography
   =========================== */

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-surface-base);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ===========================
   Layout
   =========================== */

.portal-content {
    flex: 1 0 auto;
}

.portal-footer {
    flex-shrink: 0;
}

/* ===========================
   Navbar
   =========================== */

.portal-header {
    background-color: var(--color-dark) !important;
    border-bottom: 3px solid var(--color-primary);
    transition: box-shadow 0.3s ease;
}

.portal-header.scrolled {
    box-shadow: 0 2px 16px rgba(3, 51, 51, 0.18);
}

.portal-header .navbar-brand {
    font-weight: 700;
    color: var(--color-text-on-dark) !important;
    font-size: 1.25rem;
    letter-spacing: -0.01em;
}

.portal-header .navbar-brand:hover {
    color: var(--color-text-on-dark) !important;
}

.portal-header .nav-link {
    color: rgba(255, 255, 255, 0.85) !important;
    font-weight: 500;
    font-size: 0.94rem;
    padding: 0.5rem 1rem !important;
    transition: color 0.2s ease;
}

.portal-header .nav-link:hover,
.portal-header .nav-link.active {
    color: var(--color-text-on-dark) !important;
}

.portal-header .nav-link.active {
    position: relative;
}

.portal-header .nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 1rem;
    right: 1rem;
    height: 2px;
    background-color: var(--color-primary);
    border-radius: 1px;
}

/* Hamburger icon - white */
.portal-header .navbar-toggler {
    border-color: rgba(255, 255, 255, 0.3);
    padding: 0.4rem 0.65rem;
}

.portal-header .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 0.9%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

.portal-header .navbar-toggler:focus {
    box-shadow: 0 0 0 0.2rem rgba(92, 180, 106, 0.4);
}

/* ===========================
   Breadcrumbs
   =========================== */

.portal-breadcrumb {
    background-color: var(--color-surface-base);
    border-bottom: 1px solid var(--color-border);
}

.breadcrumb {
    background: transparent;
    padding: 0;
    margin: 0;
    font-size: 0.875rem;
}

.breadcrumb-item a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.breadcrumb-item a:hover {
    color: var(--color-primary-light);
    text-decoration: underline;
}

.breadcrumb-item.active {
    color: var(--color-text-secondary);
}

/* ===========================
   Hero Section
   =========================== */

.hero-section {
    background: linear-gradient(135deg, var(--color-dark) 0%, #0a4a4a 60%, var(--color-primary) 100%) !important;
    border-radius: 12px !important;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(92, 180, 106, 0.15) 0%, transparent 70%);
    pointer-events: none;
}

.hero-section h1 {
    font-weight: 700;
    letter-spacing: -0.02em;
    font-size: 2.75rem;
}

.hero-section .lead {
    color: rgba(255, 255, 255, 0.85);
    font-weight: 400;
    font-size: 1.15rem;
}

.hero-section .form-control {
    border: 2px solid rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.95);
    border-radius: 8px 0 0 8px;
    font-size: 1rem;
    padding: 0.75rem 1.25rem;
}

.hero-section .form-control:focus {
    box-shadow: 0 0 0 0.25rem rgba(92, 180, 106, 0.3);
    border-color: var(--color-primary);
    background: #fff;
}

.hero-section .form-control::placeholder {
    color: var(--color-text-secondary);
    font-size: 0.94rem;
}

.hero-section .btn-search {
    background-color: var(--color-primary);
    border: 2px solid var(--color-primary);
    color: #fff;
    border-radius: 0 8px 8px 0;
    font-weight: 600;
    transition: background-color 0.2s ease;
}

.hero-section .btn-search:hover {
    background-color: var(--color-primary-light);
    border-color: var(--color-primary-light);
}

/* ===========================
   Section Headers
   =========================== */

.section-label {
    color: var(--color-primary);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 0.25rem;
}

.section-title {
    color: var(--color-dark);
    font-weight: 700;
}

.section-subtitle {
    color: var(--color-dark);
    font-weight: 600;
}

/* ===========================
   Cards - Global
   =========================== */

.stat-card,
.publication-card,
.quick-link-card,
.publisher-card {
    background: var(--color-surface-card);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.stat-card:hover,
.publication-card:hover,
.quick-link-card:hover,
.publisher-card:hover {
    border-color: var(--color-primary);
    box-shadow: 0 4px 16px rgba(92, 180, 106, 0.12);
    transform: translateY(-2px);
}

.stat-card:focus-within,
.publication-card:focus-within,
.quick-link-card:focus-within,
.publisher-card:focus-within {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ===========================
   Stat Cards
   =========================== */

.stat-card .stat-icon {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin: 0 auto 1rem;
}

.stat-card .stat-icon-publications {
    background: rgba(92, 180, 106, 0.12);
    color: var(--color-primary);
}

.stat-card .stat-icon-articles {
    background: rgba(3, 51, 51, 0.08);
    color: var(--color-dark);
}

.stat-card .stat-icon-publishers {
    background: rgba(92, 180, 106, 0.12);
    color: var(--color-primary);
}

.stat-card .stat-number {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--color-dark);
    line-height: 1.1;
}

.stat-card .stat-label {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    margin-top: 0.25rem;
}

/* ===========================
   Publication Cards
   =========================== */

.publication-card {
    overflow: hidden;
}

.publication-card .card-img-top {
    height: 180px;
    object-fit: cover;
    border-bottom: 1px solid var(--color-border-subtle);
}

.publication-card .card-img-placeholder {
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-surface-base);
    border-bottom: 1px solid var(--color-border-subtle);
}

.publication-card .card-img-placeholder i {
    color: var(--color-text-secondary);
    opacity: 0.4;
}

.publication-card .card-body {
    padding: 1.25rem;
}

.publication-card .card-title {
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 0.75rem;
}

.publication-card .card-title a {
    color: var(--color-dark);
    text-decoration: none;
    transition: color 0.2s ease;
}

.publication-card .card-title a:hover {
    color: var(--color-primary);
}

.publication-card .card-text {
    color: var(--color-text-secondary);
    font-size: 0.85rem;
}

/* Type badges */
.badge-type {
    background-color: var(--color-dark);
    color: #fff;
    border-radius: 4px;
    font-size: 0.78rem;
    font-weight: 500;
    padding: 3px 10px;
}

.badge-access {
    background-color: var(--color-primary);
    color: #fff;
    border-radius: 4px;
    font-size: 0.78rem;
    font-weight: 500;
    padding: 3px 10px;
}

/* ===========================
   Quick Link Cards
   =========================== */

.quick-link-card .card-body {
    padding: 1.75rem;
}

.quick-link-card .quick-link-icon {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    background: rgba(92, 180, 106, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--color-primary);
    margin: 0 auto 0.75rem;
    transition: background 0.2s ease;
}

.quick-link-card:hover .quick-link-icon {
    background: rgba(92, 180, 106, 0.2);
}

.quick-link-card h3 {
    color: var(--color-dark);
    font-weight: 600;
    font-size: 0.95rem;
}

/* ===========================
   Section Link (Show All)
   =========================== */

.section-link {
    color: var(--color-primary);
    font-weight: 500;
    font-size: 0.9rem;
    text-decoration: none;
    transition: color 0.2s ease;
}

.section-link:hover {
    color: var(--color-primary-light);
    text-decoration: underline;
}

/* ===========================
   Info Cards (metadata tables)
   =========================== */

.info-card-heading {
    border-left: 3px solid var(--color-primary);
    padding-left: 10px;
    color: var(--color-dark);
    font-weight: 600;
}

/* ===========================
   Filter Sidebar
   =========================== */

.filter-sidebar-card {
    border: 1px solid var(--color-border);
    border-radius: 10px;
    position: sticky;
    top: 80px;
}

.filter-sidebar-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 1rem;
}

.filter-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 0.5rem;
    display: block;
}

.filter-divider {
    height: 1px;
    background: var(--color-border-subtle);
    margin: 0.75rem 0;
}

.filter-sidebar-card .form-check-input:checked {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

.filter-sidebar-card .form-check-label {
    font-size: 0.875rem;
    color: var(--color-text-primary);
}

.filter-sidebar-card .form-control {
    border-color: var(--color-border);
    font-size: 0.9rem;
}

.filter-sidebar-card .form-control:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 0.2rem rgba(92, 180, 106, 0.2);
}

/* ===========================
   Detail Meta Cards
   =========================== */

.detail-meta-card {
    border: 1px solid var(--color-border);
    border-radius: 10px;
}

.detail-meta-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.detail-meta-row {
    display: flex;
    padding: 0.65rem 0;
    border-bottom: 1px solid var(--color-border-subtle);
}

.detail-meta-row:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.detail-meta-row:first-child {
    padding-top: 0;
}

.detail-meta-row dt {
    font-weight: 600;
    color: var(--color-text-primary);
    min-width: 140px;
    flex-shrink: 0;
    font-size: 0.9rem;
}

.detail-meta-row dd {
    color: var(--color-text-secondary);
    margin-bottom: 0;
    font-size: 0.9rem;
}

.detail-meta-row dd a {
    color: var(--color-primary);
    word-break: break-all;
}

.detail-meta-row dd a:hover {
    color: var(--color-primary-light);
}

/* ===========================
   Publication Detail
   =========================== */

.pub-detail-cover {
    max-height: 300px;
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.pub-detail-description {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.text-muted-custom {
    color: var(--color-text-secondary);
    font-style: italic;
}

/* ===========================
   Issue List (on publication detail)
   =========================== */

.issue-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.issue-list-item {
    display: block;
    padding: 0.85rem 1rem;
    border-bottom: 1px solid var(--color-border-subtle);
    text-decoration: none;
    color: var(--color-text-primary);
    transition: background-color 0.15s ease;
}

.issue-list-item:last-child {
    border-bottom: none;
}

.issue-list-item:hover {
    background-color: rgba(92, 180, 106, 0.06);
    color: var(--color-text-primary);
}

.issue-icon {
    width: 40px;
    height: 40px;
    min-width: 40px;
    border-radius: 8px;
    background: rgba(92, 180, 106, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    font-size: 1rem;
}

.issue-thumb {
    max-height: 40px;
    width: auto;
    border-radius: 4px;
}

.issue-label {
    color: var(--color-dark);
    font-size: 0.95rem;
}

.issue-title {
    color: var(--color-text-secondary);
    font-size: 0.85rem;
}

.issue-date {
    color: var(--color-text-secondary);
    font-size: 0.8rem;
}

.issue-article-count {
    color: var(--color-text-secondary);
    font-size: 0.8rem;
}

/* ===========================
   Issue Detail
   =========================== */

.issue-volume-label {
    color: var(--color-text-secondary);
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.issue-date-inline {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.issue-doi-box {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.issue-doi-box a {
    color: var(--color-primary);
}

/* ===========================
   Article List (on issue detail)
   =========================== */

.article-list {
    display: flex;
    flex-direction: column;
}

.article-list-item {
    display: block;
    padding: 1rem 1.25rem;
    border: 1px solid var(--color-border);
    border-radius: 10px;
    margin-bottom: 0.75rem;
    text-decoration: none;
    color: var(--color-text-primary);
    background: var(--color-surface-card);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.article-list-item:hover {
    border-color: var(--color-primary);
    box-shadow: 0 4px 16px rgba(92, 180, 106, 0.12);
    color: var(--color-text-primary);
}

.article-list-content {
    min-width: 0;
}

.article-list-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 0.25rem;
    line-height: 1.4;
}

.article-list-alt-title {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    font-style: italic;
    margin-bottom: 0.25rem;
}

.article-list-authors {
    font-size: 0.82rem;
    color: var(--color-text-secondary);
    margin-bottom: 0;
}

.article-list-pages {
    color: var(--color-text-secondary);
    font-size: 0.8rem;
    white-space: nowrap;
}

/* ===========================
   Back Button
   =========================== */

.btn-back {
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    padding: 0.5rem 1rem;
    transition: all 0.2s ease;
    text-decoration: none;
}

.btn-back:hover {
    color: var(--color-dark);
    border-color: var(--color-primary);
    background: rgba(92, 180, 106, 0.06);
}

/* ===========================
   Sidebar Cards
   =========================== */

.sidebar-card {
    border: 1px solid var(--color-border);
    border-radius: 10px;
}

.sidebar-card .card-body {
    padding: 1.25rem;
}

.sidebar-card-title {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 0.75rem;
}

.sidebar-cover-img {
    max-height: 200px;
    border-radius: 6px;
}

.sidebar-publisher-logo {
    max-height: 60px;
}

.sidebar-external-link {
    color: var(--color-text-secondary);
    font-size: 0.85rem;
}

.sidebar-external-link:hover {
    color: var(--color-primary);
}

/* ===========================
   About Page
   =========================== */

.about-lead {
    font-size: 1.1rem;
    color: var(--color-text-primary);
    line-height: 1.7;
    font-weight: 500;
}

.about-text {
    color: var(--color-text-secondary);
    line-height: 1.7;
    font-size: 0.95rem;
}

.services-grid {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.service-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem 1.25rem;
    background: var(--color-surface-card);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.service-item:hover {
    border-color: var(--color-primary);
    box-shadow: 0 4px 16px rgba(92, 180, 106, 0.1);
}

.service-item strong {
    color: var(--color-dark);
    font-weight: 600;
    font-size: 0.95rem;
    display: block;
    margin-bottom: 0.25rem;
}

.service-icon {
    width: 40px;
    height: 40px;
    min-width: 40px;
    border-radius: 10px;
    background: rgba(92, 180, 106, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    font-size: 1.1rem;
}

.about-sidebar-list li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    font-size: 0.9rem;
}

.about-sidebar-list li:last-child {
    margin-bottom: 0;
}

.about-sidebar-list a {
    color: var(--color-primary);
    text-decoration: none;
}

.about-sidebar-list a:hover {
    color: var(--color-primary-light);
    text-decoration: underline;
}

.doi-info-card {
    background: var(--color-surface-base);
}

/* ===========================
   Contact Page
   =========================== */

.contact-label {
    font-weight: 600;
    color: var(--color-dark);
    font-size: 0.875rem;
}

.btn-contact {
    padding: 0.65rem 1.5rem;
    font-weight: 600;
    border-radius: 8px;
}

.portal-content .form-control {
    border: 2px solid var(--color-border);
    border-radius: 8px;
    padding: 0.6rem 0.875rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.portal-content .form-control:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 0.2rem rgba(92, 180, 106, 0.2);
}

.portal-content .form-control::placeholder {
    color: var(--color-text-secondary);
}

/* ===========================
   Article Detail
   =========================== */

.article-alt-title {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.article-alt-subtitle {
    color: var(--color-text-secondary);
}

.author-card {
    padding: 0.75rem 1rem;
    border-radius: 8px;
    background: var(--color-surface-base);
    border: 1px solid var(--color-border-subtle);
}

.author-avatar {
    width: 40px;
    height: 40px;
    min-width: 40px;
    border-radius: 50%;
    background: var(--color-dark);
    color: var(--color-text-on-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.author-name {
    font-weight: 600;
    color: var(--color-dark);
    font-size: 0.95rem;
}

.author-affiliation {
    color: var(--color-text-secondary);
    font-size: 0.82rem;
    margin-top: 0.15rem;
}

.abstract-content {
    padding: 1.25rem;
    background: var(--color-surface-base);
    border-radius: 8px;
    border: 1px solid var(--color-border-subtle);
    line-height: 1.7;
    color: var(--color-text-primary);
}

.abstract-content p:last-child {
    margin-bottom: 0;
}

.funding-item {
    font-size: 0.9rem;
}

/* ===========================
   Pagination
   =========================== */

.pagination .page-link {
    color: var(--color-primary);
    border-color: var(--color-border);
    font-size: 0.9rem;
}

.pagination .page-item.active .page-link {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}

.pagination .page-link:hover {
    background-color: rgba(92, 180, 106, 0.1);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* ===========================
   Publisher Cards
   =========================== */

.publisher-card {
    overflow: hidden;
}

.publisher-card .card-title {
    font-weight: 600;
    line-height: 1.4;
}

.publisher-card .card-title a {
    color: var(--color-dark);
    text-decoration: none;
    transition: color 0.2s ease;
}

.publisher-card .card-title a:hover {
    color: var(--color-primary);
}

.publisher-card .card-text {
    color: var(--color-text-secondary);
    line-height: 1.55;
}

.publisher-card .card-img-placeholder {
    height: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-surface-base) 0%, #eef3f3 100%);
    border-bottom: 1px solid var(--color-border-subtle);
}

.publisher-card .card-img-placeholder i {
    font-size: 2.75rem;
    color: var(--color-text-secondary);
    opacity: 0.35;
}

.publisher-logo-wrap {
    height: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-surface-base);
    border-bottom: 1px solid var(--color-border-subtle);
}

.publisher-card .card-img-top {
    height: 140px;
    object-fit: contain;
    padding: 1.25rem;
}

.publisher-card .card-footer {
    border-top: 1px solid var(--color-border-subtle);
    padding: 0.75rem 1.25rem;
}

.publisher-card .doi-prefix-badge {
    color: var(--color-text-secondary);
    font-size: 0.8rem;
}

/* ===========================
   Publisher Detail
   =========================== */

.publisher-detail-card {
    border: 1px solid var(--color-border);
    border-radius: 10px;
    overflow: hidden;
}

.publisher-detail-logo-wrap {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    background-color: var(--color-surface-base);
    border-bottom: 1px solid var(--color-border-subtle);
}

.publisher-detail-card .card-img-top {
    max-height: 200px;
    object-fit: contain;
}

.publisher-detail-card .card-body {
    padding: 1.5rem;
}

.publisher-detail-name {
    color: var(--color-dark);
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.publisher-detail-description {
    color: var(--color-text-secondary);
    font-size: 0.92rem;
    line-height: 1.6;
    margin-bottom: 0;
}

.publisher-detail-divider {
    height: 1px;
    background: var(--color-border-subtle);
    margin: 1.25rem 0;
}

.publisher-detail-section-heading {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 1rem;
}

.publisher-info-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.publisher-info-icon {
    width: 32px;
    height: 32px;
    min-width: 32px;
    border-radius: 8px;
    background: rgba(92, 180, 106, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    font-size: 0.85rem;
}

.publisher-info-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 0.1rem;
}

.publisher-info-value {
    color: var(--color-text-primary);
}

.publisher-info-list a {
    color: var(--color-primary);
    text-decoration: none;
    word-break: break-all;
}

.publisher-info-list a:hover {
    color: var(--color-primary-light);
    text-decoration: underline;
}

.publisher-pub-count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: rgba(92, 180, 106, 0.12);
    color: var(--color-primary);
    font-weight: 700;
    font-size: 0.9rem;
}

/* ===========================
   Empty States
   =========================== */

.empty-state {
    text-align: center;
    padding: 3rem 1rem;
}

.empty-state i {
    font-size: 4rem;
    color: var(--color-text-secondary);
    opacity: 0.4;
}

.empty-state p {
    color: var(--color-text-secondary);
    margin-top: 1rem;
}

/* ===========================
   Footer
   =========================== */

.portal-footer {
    background-color: var(--color-dark) !important;
    border-top: 3px solid var(--color-primary);
}

.portal-footer h5 {
    font-weight: 700;
    color: var(--color-text-on-dark);
}

.portal-footer .footer-description {
    color: var(--color-text-muted-dark);
    font-size: 0.9rem;
    line-height: 1.6;
}

.portal-footer .footer-copyright {
    color: var(--color-text-muted-dark);
    font-size: 0.9rem;
}

.portal-footer a {
    color: rgba(255, 255, 255, 0.8) !important;
    transition: color 0.2s ease;
}

.portal-footer a:hover {
    color: var(--color-primary) !important;
}

/* ===========================
   Global Link Overrides
   =========================== */

.portal-content .text-primary {
    color: var(--color-primary) !important;
}

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

.portal-content .btn-primary:hover {
    background-color: var(--color-primary-light);
    border-color: var(--color-primary-light);
}

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

.portal-content .btn-outline-primary:hover {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}

.portal-content a:not(.btn):not(.nav-link):not(.navbar-brand):not(.breadcrumb-item a):not(.list-group-item) {
    color: var(--color-primary);
}

.portal-content a:not(.btn):not(.nav-link):not(.navbar-brand):not(.breadcrumb-item a):not(.list-group-item):hover {
    color: var(--color-primary-light);
}

.portal-content .badge.bg-secondary {
    background-color: var(--color-dark) !important;
}

/* ===========================
   DOI Prefix Badge
   =========================== */

.doi-prefix-badge {
    font-family: "SFMono-Regular", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

/* ===========================
   Search Results (Story 4.2)
   =========================== */

.search-results .card {
    transition: box-shadow 0.2s ease;
    border-radius: 10px;
}

.search-results .card:hover {
    box-shadow: 0 4px 16px rgba(92, 180, 106, 0.12);
    border-color: var(--color-primary);
}

.search-results .card-title a {
    color: var(--color-dark);
}

.search-results .card-title a:hover {
    color: var(--color-primary);
}

mark {
    background-color: rgba(92, 180, 106, 0.2);
    padding: 0.1em 0.2em;
    border-radius: 2px;
}

/* ===========================
   Filter Sidebar (Story 4.3)
   =========================== */

.filter-sidebar .card-body {
    padding: 1.25rem;
}

.filter-sidebar fieldset {
    border: none;
    padding: 0;
    margin: 0;
}

.filter-sidebar legend {
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    cursor: pointer;
}

.filter-sidebar .form-check {
    margin-bottom: 0.25rem;
}

.filter-sidebar .form-check-label {
    font-size: 0.875rem;
    color: var(--color-text-primary);
}

.filter-tag {
    display: inline-flex;
    align-items: center;
    font-size: 0.8rem;
    padding: 0.35em 0.65em;
}

.filter-tag a {
    text-decoration: none;
    font-weight: 700;
    font-size: 1rem;
    line-height: 1;
}

.filter-tag a:hover {
    opacity: 0.7;
}

.filter-sidebar .row .form-control-sm {
    font-size: 0.875rem;
}

/* ===========================
   Article Landing Page (Story 4.4)
   =========================== */

.article-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-dark);
    line-height: 1.3;
}

.article-subtitle {
    font-size: 1.15rem;
    line-height: 1.4;
}

.article-authors .author-entry {
    padding: 0.25rem 0;
}

.article-authors .author-entry .fw-semibold {
    color: var(--color-text-primary);
}

.orcid-link {
    color: #a6ce39;
    text-decoration: none;
    font-size: 0.875rem;
}

.orcid-link:hover {
    color: #82a82e;
    text-decoration: underline;
}

.orcid-link img {
    vertical-align: text-bottom;
}

.withdrawn-banner {
    border-left: 4px solid #dc3545;
    background-color: #f8d7da;
}

.withdrawn-banner .alert-heading {
    color: #842029;
}

.article-metadata dl.row dt {
    font-weight: 600;
    color: var(--color-text-primary);
}

.article-metadata dl.row dd {
    color: var(--color-text-secondary);
}

.article-metadata dl.row dd a {
    color: var(--color-primary);
    word-break: break-all;
}

.article-metadata dl.row dd a:hover {
    color: var(--color-primary-light);
}

.keyword-tag {
    font-size: 0.8rem;
    font-weight: 400;
    padding: 0.35em 0.65em;
    border-color: var(--color-primary) !important;
    color: var(--color-dark) !important;
}

.portal-content .list-group-item-action:hover {
    background-color: rgba(92, 180, 106, 0.08);
}

.portal-content .card:hover {
    border-color: rgba(92, 180, 106, 0.3);
}

/* ===========================
   Floating Action Bar (Story 4.5)
   =========================== */

.floating-action-bar {
    position: fixed;
    right: 2rem;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    z-index: 1030;
    padding: 0.75rem;
    background: white;
    border-radius: 2rem;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--color-border);
}

.fab-btn {
    width: 48px;
    height: 48px;
    min-width: 44px;
    min-height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    padding: 0;
    position: relative;
    color: var(--color-dark);
    border-color: var(--color-primary);
    transition: all 0.2s ease;
}

.fab-btn:hover {
    background-color: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

.fab-btn:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.fab-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.fab-label {
    font-size: 0.7rem;
    margin-left: 0.25rem;
}

.fab-share-dropdown {
    position: absolute;
    left: -200px;
    top: 50%;
    transform: translateY(-50%);
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 0.5rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    min-width: 180px;
    z-index: 1031;
    padding: 0.5rem 0;
}

.fab-share-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    width: 100%;
    border: none;
    background: none;
    color: var(--color-text-primary);
    text-decoration: none;
    font-size: 0.875rem;
    cursor: pointer;
    text-align: left;
}

.fab-share-option:hover {
    background-color: var(--color-surface-base);
    color: var(--color-dark);
}

/* ===========================
   Citation Modal (Story 4.7)
   =========================== */

.citation-text {
    padding: 1rem;
    background-color: var(--color-surface-base);
    border-radius: 0.375rem;
    border: 1px solid var(--color-border);
    line-height: 1.6;
    color: var(--color-text-primary);
    user-select: all;
    -webkit-user-select: all;
}

.citation-code pre {
    padding: 1rem;
    background-color: var(--color-surface-base);
    border-radius: 0.375rem;
    border: 1px solid var(--color-border);
    font-size: 0.85rem;
    line-height: 1.5;
    white-space: pre-wrap;
    word-break: break-word;
}

.citation-code code {
    color: var(--color-text-primary);
}

#citationTabs .nav-link {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

#citationTabs .nav-link:hover {
    color: var(--color-dark);
}

#citationTabs .nav-link.active {
    color: var(--color-dark);
    border-bottom-color: var(--color-primary);
    font-weight: 600;
}

/* ===========================
   Accessibility
   =========================== */

.portal-header .nav-link:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.publisher-card:focus-within,
.breadcrumb-item a:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.skip-link {
    position: absolute;
    top: -100%;
    left: 0;
    background: var(--color-dark);
    color: white;
    padding: 0.5rem 1rem;
    z-index: 9999;
}

.skip-link:focus {
    top: 0;
}

/* ===========================
   Responsive
   =========================== */

@media (max-width: 767.98px) {
    .portal-content {
        padding-top: 1rem;
        padding-bottom: 1rem;
    }

    .hero-section h1 {
        font-size: 2rem;
    }

    .hero-section .lead {
        font-size: 1rem;
    }

    .hero-section {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .hero-section .input-group-lg .form-control,
    .hero-section .input-group-lg .btn {
        min-height: 48px;
    }

    .stat-card .stat-number {
        font-size: 1.75rem;
    }

    .publisher-card .card-img-top,
    .publisher-card .card-img-placeholder {
        height: 100px;
    }

    .portal-footer .text-md-end {
        text-align: left !important;
        margin-top: 1rem;
    }

    .search-results .card-body {
        padding: 0.75rem;
    }

    .search-results .btn,
    .search-results .page-link,
    .search-results .card-title a {
        min-height: 44px;
        min-width: 44px;
    }

    .offcanvas .filter-sidebar .card {
        border: none;
        box-shadow: none;
    }

    .offcanvas .filter-sidebar .card-body {
        padding: 0;
    }
}

@media (max-width: 991.98px) {
    .floating-action-bar {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        top: auto;
        transform: none;
        flex-direction: row;
        justify-content: space-around;
        border-radius: 0;
        padding: 0.75rem 1rem;
        border-top: 1px solid var(--color-border);
        box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.08);
        gap: 0;
    }

    .fab-btn {
        width: auto;
        height: auto;
        min-width: 44px;
        min-height: 44px;
        border-radius: 0.5rem;
        font-size: 1rem;
        padding: 0.5rem 0.75rem;
        flex-direction: column;
        gap: 0.125rem;
    }

    .fab-label {
        display: block !important;
        margin-left: 0;
    }

    .fab-share-dropdown {
        left: 50%;
        transform: translateX(-50%);
        top: auto;
        bottom: 100%;
        margin-bottom: 0.5rem;
    }

    .portal-content:has(.floating-action-bar) {
        padding-bottom: 5rem;
    }
}

/* ===========================
   Animations
   =========================== */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.5s ease-out both;
}

.fade-in-up-1 { animation-delay: 0.05s; }
.fade-in-up-2 { animation-delay: 0.1s; }
.fade-in-up-3 { animation-delay: 0.15s; }
.fade-in-up-4 { animation-delay: 0.2s; }
.fade-in-up-5 { animation-delay: 0.25s; }
.fade-in-up-6 { animation-delay: 0.3s; }