/* --- Core Database System Variables --- */
:root {
    --brand-emerald: #008751;     /* Primary Action Accent color from scholar.html */
    --brand-amber: #f4b400;       /* Warning/Highlight badge indicator */
    --surface-dark: #111827;      /* High contrast layout typography */
    --surface-light: #ffffff;     /* Card background modules */
    --canvas-bg: #f9fafb;         /* Modern soft layout canvas */
    --border-slate: #e5e7eb;      /* Clean tabular separation lines */
    --text-muted: #4b5563;        /* Secondary reading content */
    --font-stack: 'Inter', system-ui, sans-serif;
    --radius-md: 8px;
    --radius-lg: 16px;
    --shadow-subtle: 0 1px 3px 0 rgba(0, 0, 0, 0.05), 0 1px 2px -1px rgba(0, 0, 0, 0.05);
    --shadow-card: 0 4px 6px -1px rgba(0, 0, 0, 0.03), 0 2px 4px -2px rgba(0, 0, 0, 0.03);
    --transition-smooth: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Global Reset Layers --- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-stack);
    background-color: var(--canvas-bg);
    color: var(--surface-dark);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.content-bound {
    width: 100%;
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 24px;
}

.space-stack {
    margin-top: 40px;
    margin-bottom: 80px;
}

/* --- Global Navigation Header --- */
.nav-container {
    background-color: var(--surface-light);
    border-bottom: 1px solid var(--border-slate);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.site-brand {
    font-size: 22px;
    font-weight: 800;
    color: var(--surface-dark);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.site-brand span {
    color: var(--brand-emerald);
}

.navigation-menu a {
    text-decoration: none;
    color: var(--surface-dark);
    font-size: 14px;
    font-weight: 600;
    margin-left: 20px;
    transition: var(--transition-smooth);
}

.navigation-menu a:hover {
    color: var(--brand-emerald);
}

/* --- Core Introduction Typographic Stack --- */
.intro-block {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 40px auto;
}

.session-badge {
    display: inline-block;
    background-color: #f3f4f6;
    color: var(--text-muted);
    font-size: 12px;
    font-weight: 700;
    padding: 6px 16px;
    border-radius: 50px;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.hero-headline {
    font-size: 42px;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -1.5px;
    margin-bottom: 20px;
    color: var(--surface-dark);
}

.hero-subtext {
    font-size: 16px;
    color: var(--text-muted);
    line-height: 1.7;
}

/* --- Database Counter Metrics Layout --- */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-bottom: 40px;
}

@media (min-width: 768px) {
    .metrics-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.metric-card {
    background-color: var(--surface-light);
    border: 1px solid var(--border-slate);
    border-radius: var(--radius-md);
    padding: 20px;
    text-align: center;
    box-shadow: var(--shadow-subtle);
}

.metric-num {
    display: block;
    font-size: 32px;
    font-weight: 800;
    color: var(--brand-emerald);
    line-height: 1;
    margin-bottom: 4px;
}

.metric-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
}

/* --- Navigation Pill Filter Bars --- */
.filter-pills-row {
    display: flex;
    gap: 10px;
    overflow-x: auto;
    padding-bottom: 12px;
    margin-bottom: 40px;
}

.filter-pills-row::-webkit-scrollbar {
    display: none;
}

.pill-item {
    white-space: nowrap;
    text-decoration: none;
    background-color: var(--surface-light);
    border: 1px solid var(--border-slate);
    color: var(--surface-dark);
    padding: 10px 18px;
    font-size: 13px;
    font-weight: 600;
    border-radius: 50px;
    box-shadow: var(--shadow-subtle);
    transition: var(--transition-smooth);
}

.pill-item:hover {
    border-color: var(--brand-emerald);
    color: var(--brand-emerald);
    background-color: #f0fdf4;
}

/* --- Generic Database Content Categorization Blocks --- */
.category-block {
    background-color: var(--surface-light);
    border: 1px solid var(--border-slate);
    border-radius: var(--radius-lg);
    padding: 32px;
    margin-bottom: 32px;
    box-shadow: var(--shadow-card);
}

.category-title-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--border-slate);
    padding-bottom: 12px;
}

.cat-label {
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--brand-emerald);
    background-color: #e8f5e9;
    padding: 4px 10px;
    border-radius: 4px;
}

.cat-index {
    font-size: 24px;
    font-weight: 800;
    color: #cbd5e1;
}

.section-heading {
    font-size: 24px;
    font-weight: 800;
    letter-spacing: -0.5px;
    margin-bottom: 12px;
}

.section-description {
    font-size: 15px;
    color: var(--text-muted);
    margin-bottom: 24px;
}

/* --- Dual Column Sub-Features Block --- */
.dual-feature-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

@media (min-width: 768px) {
    .dual-feature-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.feature-item-card {
    background-color: #fafafa;
    border: 1px solid var(--border-slate);
    border-radius: var(--radius-md);
    padding: 24px;
}

.feature-icon {
    font-size: 28px;
    display: inline-block;
    margin-bottom: 12px;
}

.feature-item-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
}

.feature-item-card p {
    font-size: 14px;
    color: var(--text-muted);
}

/* --- Vertical List Curriculum Layout Rows --- */
.curriculum-list-wrapper {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.curriculum-row-item {
    padding: 20px;
    background-color: #fbfbfb;
    border-left: 4px solid var(--brand-emerald);
    border-top: 1px solid var(--border-slate);
    border-right: 1px solid var(--border-slate);
    border-bottom: 1px solid var(--border-slate);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.row-meta h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 4px;
}

.row-meta p {
    font-size: 14px;
    color: var(--text-muted);
}

/* --- Three Column Database Showcase Cards Grid Layout --- */
.showcase-cards-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

@media (min-width: 768px) {
    .showcase-cards-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.showcase-card {
    background-color: var(--surface-light);
    border: 1px solid var(--border-slate);
    border-radius: var(--radius-md);
    padding: 24px;
    display: flex;
    flex-direction: column;
    transition: var(--transition-smooth);
}

.showcase-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.05);
}

.card-brand-icon {
    font-size: 32px;
    margin-bottom: 16px;
}

.showcase-card h3 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 10px;
}

.showcase-card p {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 16px;
    flex-grow: 1;
}

.card-badge-tag {
    display: inline-block;
    align-self: flex-start;
    background-color: #f3f4f6;
    color: var(--surface-dark);
    font-size: 11px;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 4px;
    margin-bottom: 16px;
}

.card-action-link {
    text-decoration: none;
    color: var(--brand-emerald);
    font-size: 13px;
    font-weight: 700;
    transition: var(--transition-smooth);
}

.card-action-link:hover {
    padding-left: 4px;
}

/* --- Data Table Design Grid Layout --- */
.matrix-table-container {
    width: 100%;
    overflow-x: auto;
    border: 1px solid var(--border-slate);
    border-radius: var(--radius-md);
}

.styled-matrix-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 14px;
}

.styled-matrix-table th {
    background-color: #f9fafb;
    padding: 14px 18px;
    font-weight: 700;
    border-bottom: 1px solid var(--border-slate);
}

.styled-matrix-table td {
    padding: 14px 18px;
    border-bottom: 1px solid var(--border-slate);
    color: var(--text-muted);
}

.styled-matrix-table tr:last-child td {
    border-bottom: none;
}

/* --- Affiliate Launchpads Box Layouts --- */
.affiliate-utility-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

@media (min-width: 768px) {
    .affiliate-utility-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.utility-box {
    background-color: var(--surface-light);
    border: 1px solid var(--border-slate);
    border-radius: var(--radius-md);
    padding: 24px;
    display: flex;
    flex-direction: column;
}

.util-badge {
    font-size: 10px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: #b45309;
    background-color: #fef3c7;
    padding: 2px 8px;
    border-radius: 4px;
    align-self: flex-start;
    margin-bottom: 12px;
}

.utility-box h3 {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 8px;
}

.utility-box p {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 20px;
    flex-grow: 1;
}

.utility-btn {
    text-align: center;
    text-decoration: none;
    font-size: 13px;
    font-weight: 700;
    padding: 10px;
    border-radius: var(--radius-md);
    color: var(--brand-emerald);
    background-color: #e8f5e9;
    transition: var(--transition-smooth);
}

.utility-btn:hover {
    background-color: var(--brand-emerald);
    color: var(--surface-light);
}

/* --- High-CTR Monochromatic Ad Slots Layout Containers --- */
.monetization-wrapper {
    width: 100%;
    margin: 32px auto;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.monetization-tag {
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    color: #9ca3af;
    letter-spacing: 0.5px;
    margin-bottom: 6px;
}

.ad-box-placeholder {
    width: 100%;
    background-color: #f3f4f6;
    border: 1px dashed #d1d5db;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #9ca3af;
    font-size: 13px;
    font-weight: 600;
    text-align: center;
    padding: 20px;
}

.top-leaderboard .ad-box-placeholder, .pre-footer-leaderboard .ad-box-placeholder {
    min-height: 90px;
    max-width: 728px;
}

.mid-break .ad-box-placeholder {
    min-height: 90px;
    max-width: 810px;
}

.native-content .ad-box-placeholder {
    min-height: 280px;
    max-width: 336px;
}

.section-separator-ad .ad-box-placeholder {
    min-height: 250px;
    max-width: 728px;
}

/* --- Interactive Newsletter Registration Block --- */
.newsletter-subscription-box {
    background: linear-gradient(135deg, #008751 0%, #005c36 100%);
    color: var(--surface-light);
    border-radius: var(--radius-lg);
    padding: 40px;
    text-align: center;
    margin-top: 60px;
}

.newsletter-icon {
    font-size: 40px;
    display: block;
    margin-bottom: 12px;
}

.newsletter-subscription-box h3 {
    font-size: 24px;
    font-weight: 800;
    margin-bottom: 12px;
}

.newsletter-subscription-box p {
    font-size: 15px;
    max-width: 700px;
    margin: 0 auto 28px auto;
    opacity: 0.9;
}

.subscription-form {
    display: flex;
    flex-direction: column;
    gap: 12px;
    max-width: 600px;
    margin: 0 auto 16px auto;
}

@media (min-width: 600px) {
    .subscription-form {
        flex-direction: row;
        gap: 0;
        background-color: var(--surface-light);
        padding: 6px;
        border-radius: var(--radius-md);
    }
}

.form-input {
    width: 100%;
    padding: 14px 20px;
    border: 1px solid var(--border-slate);
    border-radius: var(--radius-md);
    font-family: var(--font-stack);
    font-size: 14px;
    outline: none;
}

@media (min-width: 600px) {
    .form-input {
        border: none;
        border-radius: 0;
    }
}

.form-submit-btn {
    background-color: var(--surface-dark);
    color: var(--surface-light);
    border: none;
    padding: 14px 24px;
    font-family: var(--font-stack);
    font-size: 14px;
    font-weight: 700;
    border-radius: var(--radius-md);
    cursor: pointer;
    white-space: nowrap;
    transition: var(--transition-smooth);
}

.form-submit-btn:hover {
    background-color: #242f42;
}

.form-disclaimer-text {
    font-size: 12px !important;
    opacity: 0.7 !important;
    margin-bottom: 0 !important;
}

/* --- Global Portal Footer Structure --- */
.global-footer {
    background-color: #0f172a;
    padding: 40px 0;
    margin-top: 60px;
}

.footer-inner {
    text-align: center;
}

.footer-links-row {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 24px;
}

.footer-links-row a {
    color: #94a3b8;
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
    transition: var(--transition-smooth);
}

.footer-links-row a:hover {
    color: var(--surface-light);
}

.footer-copyright {
    color: #64748b;
    font-size: 13px;
}