/**
 * NRJBE 2027 Academic Design System
 * Modern, accessible, high-performance UI/UX for scholarly journal publishing.
 */

:root {
    --nrjbe-primary: #0F172A;
    --nrjbe-secondary: #1E293B;
    --nrjbe-accent: #0284C7;
    --nrjbe-accent-hover: #0369A1;
    --nrjbe-gold: #D97706;
    --nrjbe-gold-light: #FEF3C7;
    --nrjbe-bg: #F8FAFC;
    --nrjbe-card-bg: #FFFFFF;
    --nrjbe-border: #E2E8F0;
    --nrjbe-text: #1E293B;
    --nrjbe-text-muted: #64748B;
    --nrjbe-font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --nrjbe-font-serif: 'Lora', Georgia, Cambria, 'Times New Roman', serif;
    --nrjbe-shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --nrjbe-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.07);
    --nrjbe-shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.08);
    --nrjbe-radius: 10px;
}

body {
    font-family: var(--nrjbe-font-sans);
    color: var(--nrjbe-text);
    background-color: var(--nrjbe-bg);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, .font-serif {
    font-family: var(--nrjbe-font-serif);
    font-weight: 700;
    color: var(--nrjbe-primary);
    letter-spacing: -0.02em;
}

a {
    color: var(--nrjbe-accent);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

/* --- Top Announcement / Utility Bar --- */
.nrjbe-top-bar {
    background: #0B1120;
    color: #94A3B8;
    font-size: 0.825rem;
    padding: 8px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.nrjbe-top-bar a {
    color: #CBD5E1;
}

.nrjbe-top-bar a:hover {
    color: #FFFFFF;
}

.badge-issn {
    background: rgba(2, 132, 199, 0.18);
    color: #38BDF8;
    border: 1px solid rgba(56, 189, 248, 0.3);
    padding: 3px 8px;
    border-radius: 4px;
    font-weight: 600;
    font-family: monospace;
}

.badge-impact {
    background: rgba(217, 119, 6, 0.2);
    color: #FCD34D;
    border: 1px solid rgba(245, 158, 11, 0.35);
    padding: 3px 8px;
    border-radius: 4px;
    font-weight: 600;
}

/* --- Main Branding Header --- */
.nrjbe-header-brand {
    background: #FFFFFF;
    padding: 1.25rem 0;
    border-bottom: 1px solid var(--nrjbe-border);
}

.journal-title {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--nrjbe-primary);
    line-height: 1.2;
    margin-bottom: 4px;
}

.journal-subtitle {
    font-size: 0.925rem;
    color: var(--nrjbe-text-muted);
    margin: 0;
}

/* --- Navigation Bar --- */
.nrjbe-navbar {
    background: var(--nrjbe-primary);
    padding: 0;
    box-shadow: var(--nrjbe-shadow);
}

.nrjbe-navbar .nav-link {
    color: #E2E8F0 !important;
    font-weight: 500;
    font-size: 0.92rem;
    padding: 1rem 0.9rem !important;
    transition: all 0.2s ease;
}

.nrjbe-navbar .nav-link:hover,
.nrjbe-navbar .nav-item.active .nav-link {
    color: #FFFFFF !important;
    background: rgba(255, 255, 255, 0.08);
}

.nrjbe-navbar .dropdown-menu {
    border: 1px solid var(--nrjbe-border);
    border-radius: 8px;
    box-shadow: var(--nrjbe-shadow-lg);
    padding: 8px 0;
}

.nrjbe-navbar .dropdown-item {
    font-size: 0.9rem;
    padding: 8px 16px;
    color: var(--nrjbe-text);
}

.nrjbe-navbar .dropdown-item:hover {
    background-color: #F1F5F9;
    color: var(--nrjbe-accent);
}

.btn-submit-nav {
    background: var(--nrjbe-gold);
    color: #FFFFFF !important;
    font-weight: 700;
    border-radius: 6px;
    padding: 8px 16px !important;
    margin-left: 10px;
    transition: background 0.2s ease, transform 0.15s ease;
}

.btn-submit-nav:hover {
    background: #B45309;
    transform: translateY(-1px);
}

/* --- Journal Network Slider Bar --- */
.nrjbe-network-bar {
    background: #F1F5F9;
    border-bottom: 1px solid var(--nrjbe-border);
    padding: 6px 0;
    font-size: 0.825rem;
}

.network-pill {
    display: inline-block;
    padding: 3px 10px;
    margin: 2px 4px;
    border-radius: 20px;
    background: #FFFFFF;
    border: 1px solid var(--nrjbe-border);
    color: var(--nrjbe-text-muted);
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
}

.network-pill:hover {
    background: var(--nrjbe-primary);
    color: #FFFFFF;
    border-color: var(--nrjbe-primary);
}

/* --- Hero Section --- */
.nrjbe-hero {
    background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
    color: #FFFFFF;
    padding: 3rem 0;
    border-radius: var(--nrjbe-radius);
    margin-bottom: 2rem;
    position: relative;
    overflow: hidden;
}

.nrjbe-hero::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(2, 132, 199, 0.15) 0%, transparent 70%);
    pointer-events: none;
}

.nrjbe-hero h1 {
    color: #FFFFFF;
    font-size: 2.25rem;
    line-height: 1.25;
    margin-bottom: 1rem;
}

.nrjbe-hero p.lead {
    color: #CBD5E1;
    font-size: 1.05rem;
    line-height: 1.6;
    max-width: 720px;
}

.stat-card {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
    backdrop-filter: blur(4px);
}

.stat-number {
    font-size: 1.5rem;
    font-weight: 800;
    color: #38BDF8;
    margin-bottom: 2px;
}

.stat-label {
    font-size: 0.785rem;
    color: #94A3B8;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* --- Academic Paper Cards --- */
.paper-card {
    background: var(--nrjbe-card-bg);
    border: 1px solid var(--nrjbe-border);
    border-radius: var(--nrjbe-radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
    box-shadow: var(--nrjbe-shadow-sm);
}

.paper-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--nrjbe-shadow);
    border-color: #CBD5E1;
}

.paper-card-title {
    font-size: 1.25rem;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 0.5rem;
}

.paper-card-title a {
    color: var(--nrjbe-primary);
}

.paper-card-title a:hover {
    color: var(--nrjbe-accent);
}

.paper-authors {
    font-size: 0.925rem;
    color: #475569;
    margin-bottom: 0.75rem;
}

.paper-meta-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.8rem;
    background: #F1F5F9;
    color: #475569;
    padding: 3px 8px;
    border-radius: 4px;
    margin-right: 6px;
    margin-bottom: 6px;
}

.paper-doi-badge {
    background: #EFF6FF;
    color: #1D4ED8;
    border: 1px solid #BFDBFE;
}

.paper-abstract-snippet {
    font-size: 0.9rem;
    color: var(--nrjbe-text-muted);
    margin: 0.75rem 0 1rem;
    line-height: 1.55;
}

.btn-paper-action {
    font-size: 0.85rem;
    font-weight: 600;
    padding: 6px 14px;
    border-radius: 6px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

/* --- Scope & Focus Cards --- */
.scope-card {
    background: var(--nrjbe-card-bg);
    border: 1px solid var(--nrjbe-border);
    border-radius: var(--nrjbe-radius);
    padding: 1.5rem;
    height: 100%;
    transition: all 0.2s ease;
}

.scope-card:hover {
    border-color: var(--nrjbe-accent);
    box-shadow: var(--nrjbe-shadow);
}

.scope-icon {
    width: 44px;
    height: 44px;
    border-radius: 8px;
    background: #EFF6FF;
    color: var(--nrjbe-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

/* --- Modern Sidebar Components --- */
.nrjbe-sidebar-card {
    background: var(--nrjbe-card-bg);
    border: 1px solid var(--nrjbe-border);
    border-radius: var(--nrjbe-radius);
    padding: 1.25rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--nrjbe-shadow-sm);
}

.sidebar-heading {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--nrjbe-primary);
    padding-bottom: 8px;
    margin-bottom: 12px;
    border-bottom: 2px solid #E2E8F0;
    position: relative;
}

.sidebar-heading::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--nrjbe-accent);
}

.sidebar-link-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar-link-list li {
    margin-bottom: 8px;
}

.sidebar-link-list a {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 10px;
    border-radius: 6px;
    color: #334155;
    font-size: 0.9rem;
    transition: all 0.15s ease;
}

.sidebar-link-list a:hover {
    background: #F1F5F9;
    color: var(--nrjbe-accent);
    transform: translateX(3px);
}

/* --- Accessible Announcement Feed (replaces marquee) --- */
.announcement-feed {
    max-height: 320px;
    overflow-y: auto;
    padding-right: 4px;
}

.announcement-item {
    padding: 10px;
    background: #F8FAFC;
    border-left: 3px solid var(--nrjbe-accent);
    border-radius: 4px;
    margin-bottom: 10px;
    font-size: 0.85rem;
}

.announcement-title {
    font-weight: 600;
    color: var(--nrjbe-primary);
    margin-bottom: 2px;
}

.announcement-date {
    font-size: 0.75rem;
    color: var(--nrjbe-text-muted);
}

/* --- Footer --- */
.nrjbe-footer {
    background: #0B1120;
    color: #94A3B8;
    padding: 3.5rem 0 1.5rem;
    margin-top: 4rem;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.nrjbe-footer h5 {
    color: #FFFFFF;
    font-family: var(--nrjbe-font-sans);
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
    letter-spacing: 0.02em;
}

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

.nrjbe-footer ul li {
    margin-bottom: 8px;
}

.nrjbe-footer ul a {
    color: #94A3B8;
    font-size: 0.9rem;
    transition: color 0.15s ease;
}

.nrjbe-footer ul a:hover {
    color: #38BDF8;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 1.5rem;
    margin-top: 2.5rem;
    font-size: 0.85rem;
}

/* Responsive adjustments */
@media (max-width: 991.98px) {
    .nrjbe-hero {
        padding: 2rem 1.25rem;
    }
    .nrjbe-hero h1 {
        font-size: 1.75rem;
    }
    .journal-title {
        font-size: 1.35rem;
    }
    .btn-submit-nav {
        margin: 10px 0;
        display: inline-block;
    }
}