/* ============================================================
   ZenithCMS — High-Performance Mobile-First CSS
   Optimized for 95+ Google PageSpeed Score & Zero CLS
   ============================================================ */

:root {
    --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-serif: "Charter", "Bitstream Charter", "Sitka Text", Cambria, Georgia, serif;
    --color-bg: #0b0f19;
    --color-surface: #111827;
    --color-surface-hover: #1f2937;
    --color-border: #1e293b;
    --color-border-subtle: #334155;
    --color-text: #f8fafc;
    --color-text-muted: #94a3b8;
    --color-text-dim: #64748b;
    --color-primary: #0284c7;
    --color-primary-hover: #0369a1;
    --color-accent: #38bdf8;
    --color-badge: #0f2744;
    --color-badge-text: #7dd3fc;
    --color-verified: #10b981;
    --max-width: 1180px;
    --article-width: 780px;
}

/* Global Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.65;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.15s ease;
}

a:hover {
    color: #7dd3fc;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Header & Navbar */
.site-header {
    background-color: rgba(17, 24, 39, 0.95);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0.85rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
}

.brand-link {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--color-text);
}

.brand-logo-img {
    height: 36px;
    width: auto;
    object-fit: contain;
}

.brand-dot {
    color: var(--color-accent);
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    list-style: none;
}

.nav-link {
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--color-text-muted);
    padding: 0.4rem 0.6rem;
    border-radius: 6px;
    transition: color 0.15s ease, background-color 0.15s ease;
}

.nav-link:hover, .nav-link.active {
    color: #fff;
    background-color: var(--color-surface-hover);
}

.auth-nav-link {
    background: var(--color-primary);
    color: #fff !important;
    padding: 0.45rem 1rem;
    border-radius: 9999px;
    font-size: 0.88rem;
    font-weight: 600;
}

.auth-nav-link:hover {
    background: var(--color-primary-hover);
}

/* Social Bar Ad Placement */
.ad-social-bar-container {
    background: #0f172a;
    border-bottom: 1px solid var(--color-border);
    padding: 0.5rem 1rem;
    text-align: center;
    font-size: 0.85rem;
}

.ad-social-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    color: var(--color-text-muted);
}

.ad-badge {
    background: #1e3a8a;
    color: #93c5fd;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    padding: 2px 8px;
    border-radius: 4px;
    letter-spacing: 0.5px;
}

/* Main Layout */
.site-main {
    flex: 1 0 auto;
    max-width: var(--max-width);
    width: 100%;
    margin: 0 auto;
    padding: 2rem 1.25rem 4rem;
}

/* Discover Hero Showcase */
.discover-hero {
    margin-bottom: 3.5rem;
}

.hero-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    overflow: hidden;
    display: grid;
    grid-template-columns: 1.35fr 1fr;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.hero-card:hover {
    border-color: var(--color-border-subtle);
    transform: translateY(-2px);
}

.hero-media-wrap {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: #0f172a;
}

.hero-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    aspect-ratio: 16 / 9;
}

.hero-content {
    padding: 2.25rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.post-badge {
    display: inline-block;
    align-self: flex-start;
    background: var(--color-badge);
    color: var(--color-badge-text);
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 4px 10px;
    border-radius: 6px;
    margin-bottom: 1rem;
}

.hero-title {
    font-size: 1.85rem;
    font-weight: 800;
    line-height: 1.25;
    letter-spacing: -0.5px;
    margin-bottom: 1rem;
    color: #fff;
}

.hero-excerpt {
    color: var(--color-text-muted);
    font-size: 1.05rem;
    line-height: 1.55;
    margin-bottom: 1.5rem;
}

.author-meta-inline {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.88rem;
    color: var(--color-text-muted);
}

.meta-avatar {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    object-fit: cover;
    background: #1e293b;
    border: 1px solid var(--color-border-subtle);
}

/* Article Cards Grid */
.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.article-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.article-card:hover {
    border-color: var(--color-border-subtle);
    transform: translateY(-3px);
}

.card-media-wrap {
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: #0f172a;
}

.card-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    aspect-ratio: 16 / 9;
}

.card-body {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    flex: 1 0 auto;
}

.card-title {
    font-size: 1.22rem;
    font-weight: 700;
    line-height: 1.35;
    letter-spacing: -0.3px;
    margin-bottom: 0.75rem;
    color: #fff;
}

.card-excerpt {
    font-size: 0.94rem;
    color: var(--color-text-muted);
    line-height: 1.5;
    margin-bottom: 1.25rem;
    flex: 1 0 auto;
}

.card-meta {
    font-size: 0.82rem;
    color: var(--color-text-dim);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--color-border);
    padding-top: 0.85rem;
}

/* ============================================================
   Single Article Page Layout
   ============================================================ */
.article-container {
    max-width: var(--article-width);
    margin: 0 auto;
}

.article-header {
    margin-bottom: 2rem;
}

.article-h1 {
    font-size: 2.45rem;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.8px;
    color: #fff;
    margin: 0.75rem 0 1.25rem;
}

/* Top Byline Metadata */
.byline-container {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: 1.25rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    margin-bottom: 2rem;
}

.byline-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
    font-size: 0.92rem;
}

.byline-entity {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.byline-label {
    color: var(--color-text-dim);
}

.byline-name {
    font-weight: 600;
    color: #fff;
}

.verified-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    background: var(--color-verified);
    color: #fff;
    border-radius: 50%;
    font-size: 10px;
    margin-left: 4px;
}

.byline-dates {
    display: flex;
    gap: 1.25rem;
    font-size: 0.84rem;
    color: var(--color-text-muted);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 0.6rem;
}

/* Featured Article Image (16:9 Zero CLS) */
.article-featured-media {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 2.25rem;
    background: #0f172a;
}

.article-featured-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    aspect-ratio: 16 / 9;
}

/* Article Body Typography (Strictly Justified by default) */
.article-content {
    font-size: 1.15rem;
    line-height: 1.85;
    color: #e2e8f0;
    margin-bottom: 3.5rem;
}

.article-content p {
    text-align: justify;
    text-justify: inter-word;
    hyphens: auto;
    margin-bottom: 1.65rem;
}

.article-content h2 {
    font-size: 1.7rem;
    font-weight: 700;
    margin: 2.5rem 0 1rem;
    color: #fff;
    letter-spacing: -0.4px;
}

.article-content h3 {
    font-size: 1.35rem;
    font-weight: 600;
    margin: 2rem 0 0.85rem;
    color: #fff;
}

.article-content ul, .article-content ol {
    margin: 1.5rem 0 1.5rem 1.75rem;
}

.article-content li {
    margin-bottom: 0.6rem;
}

.article-content blockquote {
    border-left: 4px solid var(--color-primary);
    padding: 1rem 1.5rem;
    background: rgba(2, 132, 199, 0.08);
    border-radius: 0 8px 8px 0;
    font-style: italic;
    color: #94a3b8;
    margin: 2rem 0;
}

/* In-Article Ad Units (After Paragraphs 2, 4, 6) */
.in-article-ad-slot {
    margin: 2.5rem 0;
    padding: 1.25rem;
    background: #0f172a;
    border: 1px dashed var(--color-border-subtle);
    border-radius: 8px;
    text-align: center;
}

.ad-label {
    display: block;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--color-text-dim);
    margin-bottom: 0.5rem;
}

.ad-placeholder {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

/* YouTube Lazy Container (16:9 Zero CLS) */
.yt-container {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: 12px;
    overflow: hidden;
    margin: 2rem 0;
    background: #0f172a;
}

.yt-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

/* Related Articles Section */
.related-posts-section {
    border-top: 2px solid var(--color-border);
    padding-top: 3rem;
    margin-top: 3rem;
}

.related-section-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 1.5rem;
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
}

/* Author Profile Page */
.author-profile-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 2.5rem;
    margin-bottom: 3rem;
    display: flex;
    gap: 2rem;
    align-items: center;
}

.author-profile-avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--color-primary);
    flex-shrink: 0;
}

.author-profile-info {
    flex: 1;
}

.author-profile-name {
    font-size: 1.85rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 0.5rem;
}

.author-role-badge {
    display: inline-block;
    background: #065f46;
    color: #34d399;
    padding: 3px 10px;
    border-radius: 9999px;
    font-size: 0.78rem;
    font-weight: 600;
    margin-bottom: 0.85rem;
}

.author-bio {
    color: var(--color-text-muted);
    font-size: 1.05rem;
    line-height: 1.6;
    margin-bottom: 1.25rem;
}

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

.social-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 6px 14px;
    border-radius: 8px;
    background: #1e293b;
    color: #e2e8f0;
    font-size: 0.85rem;
    font-weight: 500;
    transition: background 0.15s ease;
}

.social-badge:hover {
    background: var(--color-primary);
    color: #fff;
}

/* Standardized Pagination */
.pagination-nav {
    margin: 2.5rem 0;
    display: flex;
    justify-content: center;
}

.pagination-list {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    list-style: none;
}

.pagination-link {
    display: inline-block;
    padding: 8px 16px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    color: #fff;
    font-weight: 500;
    font-size: 0.9rem;
    transition: all 0.15s ease;
}

.pagination-link:hover:not(.disabled) {
    background: var(--color-primary);
    border-color: var(--color-primary);
}

.pagination-link.disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.pagination-text {
    font-size: 0.88rem;
    color: var(--color-text-muted);
    padding: 0 12px;
}

/* Sticky Footer Ad Unit (Fixed, Dismissible) */
.sticky-footer-ad {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(8px);
    border-top: 1px solid var(--color-border-subtle);
    padding: 0.75rem 1.25rem;
    z-index: 999;
    box-shadow: 0 -10px 25px -5px rgba(0, 0, 0, 0.5);
    transition: transform 0.3s ease;
}

.sticky-footer-ad.dismissed {
    transform: translateY(100%);
    pointer-events: none;
}

.sticky-footer-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.ad-sticky-content {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.92rem;
    color: #e2e8f0;
}

.ad-btn {
    background: var(--color-primary);
    color: #fff;
    padding: 6px 14px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.85rem;
    white-space: nowrap;
}

.ad-dismiss-btn {
    background: transparent;
    border: none;
    color: var(--color-text-dim);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    line-height: 1;
}

.ad-dismiss-btn:hover {
    color: #fff;
    background: #1e293b;
}

/* Engagement Notification Modal (Centered Square, 12s trigger) */
.engagement-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    padding: 20px;
}

.engagement-modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.engagement-modal-box {
    background: var(--color-surface);
    border: 1px solid var(--color-border-subtle);
    border-radius: 16px;
    width: 360px;
    height: 360px;
    max-width: 90vw;
    max-height: 90vw;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
    position: relative;
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.engagement-modal-overlay.active .engagement-modal-box {
    transform: scale(1);
}

.modal-close-btn {
    position: absolute;
    top: 12px;
    right: 12px;
    background: transparent;
    border: none;
    color: var(--color-text-dim);
    font-size: 1.4rem;
    cursor: pointer;
    line-height: 1;
}

.modal-close-btn:hover {
    color: #fff;
}

.modal-icon-ring {
    width: 56px;
    height: 56px;
    background: rgba(2, 132, 199, 0.15);
    border: 1px solid var(--color-primary);
    border-radius: 50%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--color-accent);
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: #fff;
    margin-top: 0.5rem;
}

.modal-desc {
    font-size: 0.92rem;
    color: var(--color-text-muted);
    line-height: 1.45;
}

.modal-actions {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.btn-enable-notif {
    background: var(--color-primary);
    color: #fff;
    border: none;
    padding: 10px 16px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: background 0.15s ease;
}

.btn-enable-notif:hover {
    background: var(--color-primary-hover);
}

.btn-dismiss-modal {
    background: transparent;
    border: none;
    color: var(--color-text-dim);
    font-size: 0.85rem;
    cursor: pointer;
}

.btn-dismiss-modal:hover {
    color: var(--color-text-muted);
}

/* Site Footer */
.site-footer {
    background: #090d16;
    border-top: 1px solid var(--color-border);
    padding: 3rem 1.25rem 5rem;
    font-size: 0.9rem;
    color: var(--color-text-dim);
}

.footer-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
    text-align: center;
}

.footer-nav {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    justify-content: center;
    list-style: none;
}

.footer-link {
    color: var(--color-text-muted);
    font-size: 0.88rem;
}

.footer-link:hover {
    color: #fff;
}

.footer-disclaimer-text {
    max-width: 650px;
    font-size: 0.8rem;
    line-height: 1.5;
}

/* Responsive Breakpoints */
@media (max-width: 768px) {
    .header-container {
        padding: 0.75rem 1rem;
    }
    .hero-card {
        grid-template-columns: 1fr;
    }
    .hero-content {
        padding: 1.5rem;
    }
    .hero-title {
        font-size: 1.45rem;
    }
    .article-h1 {
        font-size: 1.75rem;
    }
    .author-profile-card {
        flex-direction: column;
        text-align: center;
        padding: 1.75rem;
    }
    .author-social-links {
        justify-content: center;
    }
    .sticky-footer-inner {
        flex-direction: column;
        text-align: center;
    }
}