/* ==========================================================================
   MathLesson Modern Design System - MathLesson Grade 1-8
   High Performance, SEO-Optimized, AdSense Compliant Design
   ========================================================================== */

:root {
    --primary: #059669;
    --primary-accent: #10b981;
    --primary-light: rgba(37, 99, 235, 0.08);
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --bg-card-hover: #f1f5f9;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --text-light: #94a3b8;
    --border-color: #e2e8f0;
    --border-highlight: #cbd5e1;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'Fira Code', monospace;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --container-max: 1200px;
}

/* Dark Mode Palette */
body.dark-theme {
    --bg-main: #0b0f19;
    --bg-card: #151d30;
    --bg-card-hover: #1e293b;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --text-light: #64748b;
    --border-color: #222f49;
    --border-highlight: #334155;
    --primary-light: rgba(59, 130, 246, 0.15);
}

/* Global Reset & Base */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

/* Reading Progress Bar */
.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--primary-accent));
    width: 0%;
    z-index: 9999;
    transition: width 0.1s ease-out;
}

/* Header & Navigation */
.site-header {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    width: 100%;
}
body.dark-theme .site-header {
    background: rgba(21, 29, 48, 0.92);
}

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

.logo-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
}
.brand-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text-main);
    white-space: nowrap;
}
.brand-logo:hover {
    text-decoration: none;
}
.logo-icon {
    font-size: 1.4rem;
}
.niche-badge {
    font-size: 0.75rem;
    background: var(--primary-light);
    color: var(--primary);
    padding: 0.2rem 0.6rem;
    border-radius: 9999px;
    font-weight: 600;
    white-space: nowrap;
}

.main-nav {
    display: flex;
    align-items: center;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 1rem;
    align-items: center;
    flex-wrap: nowrap;
}
.nav-links li {
    display: inline-flex;
}
.nav-links a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-main);
    padding: 0.4rem 0.75rem;
    border-radius: var(--radius-sm);
    white-space: nowrap;
    display: inline-block;
}
.nav-links a:hover, .nav-links a.active {
    color: var(--primary);
    text-decoration: none;
    background: var(--primary-light);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
}
.icon-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-main);
    width: 38px;
    height: 38px;
    border-radius: var(--radius-md);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
}
.icon-btn:hover {
    background: var(--bg-card-hover);
}
.mobile-only {
    display: none;
}

/* Mobile Drawer - Completely Hidden by Default on All Devices */
.mobile-drawer {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 290px;
    height: 100vh;
    background: var(--bg-card);
    border-right: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    z-index: 99999;
    padding: 1.75rem 1.5rem;
    overflow-y: auto;
    transform: translateX(-100%);
    transition: transform 0.25s ease-in-out;
}
.mobile-drawer.active {
    display: block;
    transform: translateX(0);
}
.drawer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}
.drawer-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-main);
}
.drawer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.drawer-links a {
    display: block;
    padding: 0.65rem 0.85rem;
    border-radius: var(--radius-sm);
    color: var(--text-main);
    font-weight: 500;
    font-size: 0.95rem;
}
.drawer-links a:hover {
    background: var(--primary-light);
    color: var(--primary);
    text-decoration: none;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--primary-light) 0%, transparent 100%);
    padding: 4rem 1.5rem;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}
.hero-container {
    max-width: 850px;
    margin: 0 auto;
}
.hero-badge {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--primary);
    background: var(--primary-light);
    padding: 0.35rem 1rem;
    border-radius: 9999px;
    margin-bottom: 1rem;
}
.hero-title {
    font-size: 2.75rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.25rem;
    letter-spacing: -0.02em;
}
.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
    line-height: 1.6;
}
.hero-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    border: none;
    text-decoration: none;
}
.btn:hover {
    text-decoration: none;
    transform: translateY(-1px);
}
.btn-primary {
    background: var(--primary);
    color: #ffffff;
    box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
    background: var(--primary-accent);
}
.btn-secondary {
    background: var(--bg-card-hover);
    color: var(--text-main);
    border: 1px solid var(--border-color);
}
.btn-outline {
    background: transparent;
    color: var(--text-main);
    border: 1.5px solid var(--border-highlight);
}
.btn-block {
    width: 100%;
}

/* Ad Placements */
.ad-slot-container {
    max-width: var(--container-max);
    margin: 1.5rem auto;
    padding: 0 1.5rem;
    text-align: center;
}
.ad-placeholder {
    background: var(--bg-card);
    border: 1px dashed var(--border-highlight);
    border-radius: var(--radius-md);
    padding: 1.5rem 1rem;
    min-height: 90px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
.ad-label {
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--text-light);
    letter-spacing: 0.1em;
    margin-bottom: 0.5rem;
    display: block;
}

/* Categories Section */
.section-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 3.5rem 1.5rem;
}
.section-title {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}
.section-subtitle {
    color: var(--text-muted);
    margin-bottom: 2rem;
}
.category-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}
.category-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    box-shadow: var(--shadow-sm);
}
.category-card:hover {
    border-color: var(--primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}
.cat-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
    display: block;
}
.category-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}
.category-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}
.cat-link {
    font-weight: 600;
    font-size: 0.9rem;
}

/* Articles Grid */
.section-header-flex {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 2rem;
}
#category-filter-select {
    padding: 0.6rem 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    color: var(--text-main);
    font-size: 0.95rem;
    font-weight: 600;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 1.75rem;
}
.full-width-grid {
    grid-column: 1 / -1;
}
.article-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    box-shadow: var(--shadow-sm);
}
.article-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}
.card-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    margin-bottom: 0.75rem;
}
.card-cat {
    font-weight: 700;
    color: var(--primary);
    background: var(--primary-light);
    padding: 0.15rem 0.5rem;
    border-radius: var(--radius-sm);
}
.card-time {
    color: var(--text-light);
}
.card-title {
    font-size: 1.25rem;
    line-height: 1.4;
    margin-bottom: 0.75rem;
}
.card-title a {
    color: var(--text-main);
}
.card-title a:hover {
    color: var(--primary);
}
.card-excerpt {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    flex-grow: 1;
}
.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
    font-size: 0.85rem;
}
.card-author {
    color: var(--text-muted);
}
.read-more-link {
    font-weight: 700;
}

/* Article Page Layout */
.article-page-layout {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 2rem 1.5rem;
}
.breadcrumbs {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}
.breadcrumbs .sep {
    margin: 0 0.5rem;
}
.current-crumb {
    color: var(--text-main);
    font-weight: 600;
}
.article-grid-container {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 3rem;
    margin-top: 1.5rem;
}
.article-main-body {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    box-shadow: var(--shadow-sm);
}
.article-meta-top {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    font-size: 0.85rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}
.cat-pill {
    background: var(--primary-light);
    color: var(--primary);
    font-weight: 700;
    padding: 0.2rem 0.7rem;
    border-radius: 9999px;
}
.read-time-pill, .date-pill {
    color: var(--text-muted);
}
.article-title {
    font-size: 2.25rem;
    line-height: 1.25;
    margin-bottom: 1.5rem;
    font-weight: 800;
}
.author-bar {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 2rem;
}
.author-avatar-sm {
    width: 44px;
    height: 44px;
    background: var(--primary);
    color: white;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}
.author-info {
    font-size: 0.9rem;
    display: flex;
    flex-direction: column;
}
.author-creds {
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* Table of Contents */
.toc-container {
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.25rem 1.5rem;
    margin-bottom: 2rem;
}
.toc-title {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
}
.toc-nav ul {
    list-style: none;
    padding-left: 0;
}
.toc-nav li {
    margin-bottom: 0.4rem;
}
.toc-nav a {
    color: var(--text-muted);
    font-size: 0.9rem;
}
.toc-nav a:hover {
    color: var(--primary);
}

/* Typography & Callout Boxes inside Article */
.article-content h2 {
    font-size: 1.6rem;
    margin-top: 2.25rem;
    margin-bottom: 1rem;
    padding-bottom: 0.4rem;
    border-bottom: 2px solid var(--primary-light);
}
.article-content h3 {
    font-size: 1.25rem;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
}
.article-content p {
    margin-bottom: 1.25rem;
}
.article-content ul, .article-content ol {
    margin-left: 1.5rem;
    margin-bottom: 1.25rem;
}
.article-content li {
    margin-bottom: 0.5rem;
}

.formula-box {
    background: var(--primary-light);
    border-left: 4px solid var(--primary);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin: 1.75rem 0;
}
.formula-box h3 {
    margin-top: 0;
    color: var(--primary);
    font-size: 1.15rem;
}
.math-display {
    font-size: 1.15rem;
    margin: 1rem 0;
    overflow-x: auto;
}

.example-box {
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin: 1.75rem 0;
}
.example-box h4 {
    font-size: 1.1rem;
    color: var(--primary);
    margin-bottom: 0.75rem;
}

.practice-box {
    background: rgba(16, 185, 129, 0.08);
    border: 1px solid #10b981;
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin: 1.75rem 0;
}
.practice-box h4 {
    color: #059669;
    margin-bottom: 0.5rem;
}
details summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--primary);
    margin-top: 0.75rem;
}

/* FAQ Accordion */
.faq-accordion {
    margin-top: 1.5rem;
}
.faq-item {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    margin-bottom: 1rem;
    background: var(--bg-card);
}
.faq-question {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

/* Related Articles & Author Footer */
.article-footer-box {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}
.share-buttons {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
}
.share-btn {
    padding: 0.4rem 0.8rem;
    border: 1px solid var(--border-color);
    background: var(--bg-main);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--text-main);
}
.author-bio-footer {
    display: flex;
    gap: 1.5rem;
    background: var(--bg-main);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    align-items: center;
}
.author-avatar {
    width: 64px;
    height: 64px;
    background: var(--primary);
    color: white;
    font-size: 1.5rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    flex-shrink: 0;
}
.related-posts-section {
    margin-top: 3rem;
}
.related-posts-section h3 {
    font-size: 1.4rem;
    margin-bottom: 1.25rem;
}
.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1rem;
}
.related-card {
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.25rem;
}
.card-cat-sm {
    font-size: 0.75rem;
    color: var(--primary);
    font-weight: 700;
}
.related-card h4 {
    font-size: 0.95rem;
    margin: 0.4rem 0;
}

/* Sticky Sidebar */
.article-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}
.sidebar-widget {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
}
.widget-title {
    font-size: 1.15rem;
    margin-bottom: 0.75rem;
}
.sidebar-topic-list {
    list-style: none;
}
.sidebar-topic-list li {
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

/* Interactive Calculator Page */
.calculator-hero {
    background: linear-gradient(135deg, var(--primary-light) 0%, transparent 100%);
    padding: 3rem 1.5rem;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}
.calculator-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2.5rem 1.5rem;
}
.calc-app-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    box-shadow: var(--shadow-md);
    margin-bottom: 2.5rem;
}
.calc-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}
.badge-live {
    background: #10b981;
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.2rem 0.6rem;
    border-radius: 9999px;
    text-transform: uppercase;
}
.calc-inputs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
    margin-bottom: 1.75rem;
}
.input-field-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}
.input-field-group input, .form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-main);
    color: var(--text-main);
    font-family: inherit;
    font-size: 1rem;
}
.calc-actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}
.calc-results-box {
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
}
.calc-results-box h3 {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
}
.output-content {
    font-family: var(--font-mono);
    font-size: 0.95rem;
}

/* Practice Quiz */
.quiz-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
}
.quiz-box {
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin: 1.5rem 0;
}
.quiz-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    margin-top: 1rem;
}
.quiz-opt {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
    cursor: pointer;
    font-size: 0.95rem;
    text-align: left;
    color: var(--text-main);
}
.quiz-opt:hover {
    border-color: var(--primary);
}
.quiz-opt.correct {
    background: #d1fae5;
    border-color: #10b981;
    color: #065f46;
    font-weight: 700;
}
.quiz-opt.wrong {
    background: #fee2e2;
    border-color: #ef4444;
    color: #991b1b;
}
.quiz-feedback-box {
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
}
.hidden {
    display: none;
}

/* Cheatsheet Grid */
.cheatsheet-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 1.25rem;
}
.cheat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    text-align: center;
}
.cheat-card h4 {
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
}

/* Legal Pages */
.legal-page-container {
    max-width: 850px;
    margin: 0 auto;
    padding: 3rem 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}
.page-title {
    font-size: 2.25rem;
    margin-bottom: 0.75rem;
}
.lead-text {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}
.legal-page-container h2 {
    font-size: 1.4rem;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}
.legal-page-container p, .legal-page-container ul, .legal-page-container ol {
    margin-bottom: 1.25rem;
}
.legal-page-container li {
    margin-left: 1.5rem;
    margin-bottom: 0.5rem;
}
.contact-grid {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 2rem;
    margin-top: 2rem;
}
.form-group {
    margin-bottom: 1.25rem;
}
.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
}

/* Footer */
.site-footer {
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}
.footer-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 4rem 1.5rem 2.5rem;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 2.5rem;
}
.brand-col p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin: 1rem 0;
}
.footer-heading {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
}
.footer-links {
    list-style: none;
}
.footer-links li {
    margin-bottom: 0.6rem;
}
.footer-links a {
    color: var(--text-muted);
    font-size: 0.9rem;
}
.footer-links a:hover {
    color: var(--primary);
}
.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding: 1.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}
.bottom-container {
    max-width: var(--container-max);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}
.text-btn {
    background: transparent;
    border: none;
    color: var(--primary);
    cursor: pointer;
    font-size: 0.85rem;
}
.text-btn:hover {
    text-decoration: underline;
}

/* Search Modal & Cookie Banner */
.search-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(6px);
    z-index: 99999;
    align-items: flex-start;
    justify-content: center;
    padding-top: 10vh;
}
.search-modal.active {
    display: flex;
}
.search-modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 650px;
    padding: 1.5rem;
    box-shadow: var(--shadow-lg);
}
.search-input-wrapper {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border-bottom: 2px solid var(--primary);
    padding-bottom: 0.75rem;
}
.search-input-wrapper input {
    flex-grow: 1;
    border: none;
    background: transparent;
    font-size: 1.1rem;
    color: var(--text-main);
    outline: none;
}
.search-results-list {
    max-height: 380px;
    overflow-y: auto;
    margin-top: 1rem;
}
.search-res-item {
    padding: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    display: block;
}
.search-res-item:hover {
    background: var(--bg-card-hover);
    text-decoration: none;
}
.search-res-item h4 {
    font-size: 1rem;
    color: var(--text-main);
}
.search-res-item p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.cookie-banner {
    display: none;
    position: fixed;
    bottom: 20px;
    right: 20px;
    max-width: 440px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-lg);
    z-index: 99998;
}
.cookie-banner.show {
    display: block;
}
.cookie-content p {
    font-size: 0.85rem;
    margin-bottom: 1rem;
}
.cookie-buttons {
    display: flex;
    gap: 0.75rem;
}

/* Responsive Mobile Rules */
@media (max-width: 992px) {
    .article-grid-container {
        grid-template-columns: 1fr;
    }
    .footer-container {
        grid-template-columns: 1fr 1fr;
    }
    .contact-grid {
        grid-template-columns: 1fr;
    }
}
@media (max-width: 768px) {
    .nav-links {
        display: none !important;
    }
    .mobile-only {
        display: inline-flex !important;
    }
    .hero-title {
        font-size: 2rem;
    }
    .footer-container {
        grid-template-columns: 1fr;
    }
    .quiz-options {
        grid-template-columns: 1fr;
    }
    .article-main-body {
        padding: 1.5rem;
    }
}