/* ==========================================================================
   FigigExams Learn Pages — Design System
   Static HTML pages for SEO content (independent of Blazor)
   Matches main app branding from landing-v2.css
   ========================================================================== */

/* ═══ CSS VARIABLES ═══ */
:root {
    --learn-primary: #2A9EA6;
    --learn-primary-dark: #26808C;
    --learn-primary-light: #45B5BA;
    --learn-primary-bg: #EDF7F8;
    --learn-accent: #7A82AB;
    --learn-success: #10B981;
    --learn-success-bg: #D1FAE5;
    --learn-danger: #EF4444;
    --learn-danger-bg: #FEE2E2;
    --learn-warning: #F59E0B;
    --learn-warning-bg: #FEF3C7;
    --learn-bg: #FFFFFF;
    --learn-bg-alt: #F8FAFC;
    --learn-bg-dark: #0F172A;
    --learn-text: #0F172A;
    --learn-text-muted: #64748B;
    --learn-text-light: #94A3B8;
    --learn-border: #E2E8F0;
    --learn-border-dark: #CBD5E1;
    --learn-radius: 12px;
    --learn-radius-sm: 8px;
    --learn-radius-lg: 16px;
    --learn-shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --learn-shadow: 0 4px 16px rgba(0,0,0,0.08);
    --learn-shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
    --learn-max-w: 1200px;
    --learn-content-w: 800px;
}

/* ═══ RESET & BASE ═══ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--learn-text);
    line-height: 1.7;
    background: var(--learn-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: var(--learn-primary);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--learn-primary-dark);
}

/* ═══ NAVIGATION ═══ */
.learn-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--learn-border);
    padding: 0 24px;
}

.learn-nav-inner {
    max-width: var(--learn-max-w);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.learn-nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 18px;
    color: var(--learn-text);
    text-decoration: none;
}

.learn-nav-logo img {
    width: 32px;
    height: 32px;
    object-fit: contain;
    flex-shrink: 0;
}

.learn-nav-links {
    display: flex;
    align-items: center;
    gap: 24px;
}

.learn-nav-links a {
    font-size: 14px;
    font-weight: 500;
    color: var(--learn-text-muted);
    text-decoration: none;
    transition: color 0.2s;
}

.learn-nav-links a:hover {
    color: var(--learn-text);
}

.learn-nav-links .btn-login {
    color: var(--learn-primary);
    font-weight: 600;
}

.learn-nav-links .btn-cta {
    background: var(--learn-primary);
    color: #fff;
    padding: 8px 20px;
    border-radius: var(--learn-radius-sm);
    font-weight: 600;
    transition: all 0.2s;
}

.learn-nav-links .btn-cta:hover {
    background: var(--learn-primary-dark);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(42,158,166,0.3);
}

/* Mobile hamburger */
.learn-nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    color: var(--learn-text);
}

.learn-nav-toggle svg {
    width: 24px;
    height: 24px;
}

/* ═══ BREADCRUMBS ═══ */
.breadcrumbs {
    max-width: var(--learn-max-w);
    margin: 0 auto;
    padding: 16px 24px;
    font-size: 13px;
    color: var(--learn-text-muted);
}

.breadcrumbs a {
    color: var(--learn-text-muted);
    text-decoration: none;
}

.breadcrumbs a:hover {
    color: var(--learn-primary);
}

.breadcrumbs .separator {
    margin: 0 8px;
    color: var(--learn-text-light);
}

/* ═══ MAIN CONTENT LAYOUT ═══ */
.learn-content {
    max-width: var(--learn-content-w);
    margin: 0 auto;
    padding: 0 24px 80px;
}

/* ═══ ARTICLE HEADER ═══ */
.learn-content h1 {
    font-size: 2.25rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 16px;
    color: var(--learn-text);
    letter-spacing: -0.02em;
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    font-size: 14px;
    color: var(--learn-text-muted);
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--learn-border);
}

.article-meta .separator {
    color: var(--learn-text-light);
}

/* ═══ AUTHOR BIO ═══ */
.author-box {
    display: flex;
    align-items: center;
    gap: 16px;
    background: var(--learn-bg-alt);
    border: 1px solid var(--learn-border);
    border-radius: var(--learn-radius);
    padding: 20px 24px;
    margin-bottom: 32px;
}

.author-box .author-avatar {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--learn-primary), var(--learn-accent));
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: white;
    font-weight: 700;
    font-size: 20px;
}

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

.author-box .author-name {
    font-weight: 700;
    font-size: 15px;
    color: var(--learn-text);
    margin-bottom: 2px;
}

.author-box .author-title {
    font-size: 13px;
    color: var(--learn-text-muted);
    line-height: 1.4;
}

.author-box .verified-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    font-weight: 600;
    color: var(--learn-success);
    background: var(--learn-success-bg);
    padding: 4px 10px;
    border-radius: 20px;
    margin-top: 6px;
}

.author-box .verified-badge svg {
    width: 14px;
    height: 14px;
}

/* ═══ TABLE OF CONTENTS ═══ */
.toc {
    background: var(--learn-bg-alt);
    border: 1px solid var(--learn-border);
    border-radius: var(--learn-radius);
    padding: 24px;
    margin-bottom: 40px;
}

.toc h3 {
    font-size: 14px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--learn-text-muted);
    margin-bottom: 12px;
}

.toc ul {
    list-style: none;
    padding: 0;
}

.toc li {
    margin-bottom: 6px;
}

.toc a {
    font-size: 15px;
    font-weight: 500;
    color: var(--learn-primary);
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 0;
}

.toc a::before {
    content: '→';
    color: var(--learn-primary-light);
    font-size: 13px;
}

.toc a:hover {
    color: var(--learn-primary-dark);
}

/* ═══ ARTICLE CONTENT ═══ */
.learn-content article section {
    margin-bottom: 40px;
}

.learn-content h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--learn-text);
    padding-top: 8px;
}

.learn-content h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--learn-text);
}

.learn-content p {
    margin-bottom: 16px;
    font-size: 16px;
    line-height: 1.8;
    color: #1E293B;
}

.learn-content ul, .learn-content ol {
    margin-bottom: 16px;
    padding-left: 24px;
}

.learn-content li {
    margin-bottom: 8px;
    line-height: 1.7;
}

.learn-content strong {
    font-weight: 600;
    color: var(--learn-text);
}

/* ═══ CODE BLOCKS ═══ */
.learn-content pre {
    background: #1E293B;
    color: #E2E8F0;
    border-radius: var(--learn-radius);
    padding: 20px 24px;
    margin-bottom: 24px;
    overflow-x: auto;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 14px;
    line-height: 1.6;
    border: 1px solid #334155;
}

.learn-content pre code {
    background: transparent;
    padding: 0;
    font-size: inherit;
    color: inherit;
}

.learn-content code {
    background: var(--learn-primary-bg);
    color: var(--learn-primary-dark);
    padding: 2px 8px;
    border-radius: 4px;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.9em;
}

.code-label {
    display: block;
    background: #334155;
    color: #94A3B8;
    padding: 8px 24px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--learn-radius) var(--learn-radius) 0 0;
    margin-bottom: -1px;
}

.code-label + pre {
    border-radius: 0 0 var(--learn-radius) var(--learn-radius);
}

/* ═══ INFO BOXES ═══ */
.info-box {
    border-radius: var(--learn-radius);
    padding: 20px 24px;
    margin-bottom: 24px;
    font-size: 15px;
    line-height: 1.7;
    display: flex;
    gap: 12px;
}

.info-box-icon {
    flex-shrink: 0;
    font-size: 20px;
    line-height: 1.5;
}

.info-box--tip {
    background: var(--learn-success-bg);
    border-left: 4px solid var(--learn-success);
}

.info-box--warning {
    background: var(--learn-warning-bg);
    border-left: 4px solid var(--learn-warning);
}

.info-box--important {
    background: var(--learn-primary-bg);
    border-left: 4px solid var(--learn-primary);
}

.info-box--exam {
    background: #F0F9FF;
    border-left: 4px solid #0EA5E9;
}

/* ═══ TABLES ═══ */
.learn-content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 24px;
    font-size: 15px;
    border-radius: var(--learn-radius);
    overflow: hidden;
    border: 1px solid var(--learn-border);
}

.learn-content th {
    background: var(--learn-bg-alt);
    font-weight: 600;
    text-align: left;
    padding: 12px 16px;
    border-bottom: 2px solid var(--learn-border);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--learn-text-muted);
}

.learn-content td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--learn-border);
}

.learn-content tr:last-child td {
    border-bottom: none;
}

/* ═══ STUDY GUIDE PROMO ═══ */
.study-guide-promo {
    background: linear-gradient(135deg, #0F172A, #1E293B);
    border-radius: var(--learn-radius);
    padding: 32px;
    margin: 40px 0;
    color: #F8FAFC;
    position: relative;
    overflow: hidden;
}

.study-guide-promo::before {
    content: '';
    position: absolute;
    top: -40px;
    right: -40px;
    width: 120px;
    height: 120px;
    background: radial-gradient(circle, rgba(42,158,166,0.3), transparent 70%);
    border-radius: 50%;
}

.study-guide-promo .promo-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(42,158,166,0.2);
    color: #9BA2C8;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 6px 12px;
    border-radius: 20px;
    margin-bottom: 16px;
}

.study-guide-promo h3 {
    color: #F8FAFC;
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0 0 8px 0;
}

.study-guide-promo p {
    color: #94A3B8;
    font-size: 15px;
    line-height: 1.6;
    margin: 0 0 20px 0;
}

.study-guide-promo .promo-features {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 24px;
    margin-bottom: 24px;
}

.study-guide-promo .promo-feature {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: #CBD5E1;
}

.study-guide-promo .promo-feature svg {
    flex-shrink: 0;
    color: #2A9EA6;
}

.study-guide-promo .promo-cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: #2A9EA6;
    color: #fff;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 15px;
    text-decoration: none;
    transition: background 0.2s;
}

.study-guide-promo .promo-cta:hover {
    background: #26808C;
}

@media (max-width: 640px) {
    .study-guide-promo {
        padding: 24px;
    }
    .study-guide-promo .promo-features {
        flex-direction: column;
        gap: 8px;
    }
}

/* ═══ INLINE CTA ═══ */
.inline-cta {
    background: linear-gradient(135deg, var(--learn-primary-bg), #F5F3FF);
    border: 1px solid rgba(42,158,166,0.2);
    border-radius: var(--learn-radius);
    padding: 24px;
    margin: 32px 0;
    text-align: center;
}

.inline-cta p {
    margin: 0;
    font-size: 16px;
}

.inline-cta a {
    font-weight: 600;
    color: var(--learn-primary);
}

/* ═══ DEEPER CTA (before practice questions) ═══ */
.deeper-cta {
    background: var(--learn-bg-alt);
    border: 1px solid var(--learn-border);
    border-radius: var(--learn-radius-lg);
    padding: 32px;
    margin: 40px 0;
}

.deeper-cta h2 {
    font-size: 1.35rem;
    margin: 0 0 20px 0;
    color: var(--learn-text);
}

.deeper-cta-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.deeper-cta-card {
    display: block;
    background: var(--learn-bg);
    border: 1px solid var(--learn-border);
    border-radius: var(--learn-radius);
    padding: 20px;
    text-decoration: none;
    color: var(--learn-text);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.deeper-cta-card:hover {
    border-color: var(--learn-primary);
    box-shadow: 0 2px 12px rgba(42,158,166,0.12);
    text-decoration: none;
}

.deeper-cta-card .cta-icon {
    font-size: 1.5rem;
    margin-bottom: 8px;
    display: block;
}

.deeper-cta-card h3 {
    font-size: 1rem;
    margin: 0 0 6px 0;
    color: var(--learn-primary);
}

.deeper-cta-card p {
    margin: 0;
    font-size: 14px;
    color: var(--learn-text-muted);
    line-height: 1.5;
}

/* ═══ STICKY SIDE CTA (desktop) ═══ */
.sticky-cta {
    display: none;
}

@media (min-width: 1200px) {
    .sticky-cta {
        display: block;
        position: fixed;
        right: 24px;
        top: 50%;
        transform: translateY(-50%);
        width: 260px;
        background: var(--learn-bg);
        border: 1px solid var(--learn-border);
        border-radius: var(--learn-radius-lg);
        box-shadow: 0 4px 24px rgba(0,0,0,0.08);
        padding: 24px;
        z-index: 50;
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.3s ease;
    }

    .sticky-cta.visible {
        opacity: 1;
        pointer-events: auto;
    }

    .sticky-cta-dismiss {
        position: absolute;
        top: 8px;
        right: 10px;
        background: none;
        border: none;
        color: var(--learn-text-light);
        cursor: pointer;
        font-size: 18px;
        padding: 4px;
        line-height: 1;
    }

    .sticky-cta-dismiss:hover {
        color: var(--learn-text);
    }

    .sticky-cta-item {
        display: block;
        text-decoration: none;
        color: var(--learn-text);
        padding: 14px;
        border-radius: var(--learn-radius-sm);
        transition: background 0.2s;
        margin-bottom: 8px;
    }

    .sticky-cta-item:last-child {
        margin-bottom: 0;
    }

    .sticky-cta-item:hover {
        background: var(--learn-bg-alt);
        text-decoration: none;
    }

    .sticky-cta-item .cta-icon {
        font-size: 1.3rem;
        display: block;
        margin-bottom: 4px;
    }

    .sticky-cta-item h4 {
        margin: 0 0 4px 0;
        font-size: 14px;
        font-weight: 600;
        color: var(--learn-primary);
    }

    .sticky-cta-item p {
        margin: 0;
        font-size: 12px;
        color: var(--learn-text-muted);
        line-height: 1.4;
    }

    .sticky-cta .sticky-divider {
        height: 1px;
        background: var(--learn-border);
        margin: 4px 0;
    }
}

/* ═══ MOBILE INLINE CTA BANNER ═══ */
.mobile-cta-banner {
    display: none;
}

@media (max-width: 1199px) {
    .mobile-cta-banner {
        display: flex;
        gap: 10px;
        margin: 28px 0;
        opacity: 0;
        max-height: 0;
        overflow: hidden;
        transition: opacity 0.3s, max-height 0.3s;
    }

    .mobile-cta-banner.visible {
        opacity: 1;
        max-height: 80px;
    }

    .mobile-cta-btn {
        flex: 1;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 6px;
        padding: 12px 14px;
        border-radius: var(--learn-radius-sm);
        font-size: 13px;
        font-weight: 600;
        text-decoration: none;
        text-align: center;
        transition: opacity 0.2s;
    }

    .mobile-cta-btn:hover {
        opacity: 0.9;
        text-decoration: none;
    }

    .mobile-cta-btn--study {
        background: var(--learn-primary-bg);
        color: var(--learn-primary);
        border: 1px solid rgba(42,158,166,0.2);
    }

    .mobile-cta-btn--exam {
        background: var(--learn-primary);
        color: white;
        border: 1px solid var(--learn-primary);
    }
}

/* ═══ REDESIGNED BOTTOM CTA ═══ */
.bottom-cta {
    margin: 40px 0;
}

.bottom-cta h2 {
    font-size: 1.35rem;
    margin: 0 0 12px 0;
    color: var(--learn-text);
}

.bottom-cta > p {
    color: var(--learn-text-muted);
    margin: 0 0 20px 0;
    font-size: 15px;
}

.bottom-cta-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 16px;
}

.bottom-cta-card {
    display: block;
    background: var(--learn-bg);
    border: 1px solid var(--learn-border);
    border-radius: var(--learn-radius);
    padding: 24px;
    text-decoration: none;
    color: var(--learn-text);
    transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}

.bottom-cta-card:hover {
    border-color: var(--learn-primary);
    box-shadow: 0 4px 16px rgba(42,158,166,0.1);
    transform: translateY(-2px);
    text-decoration: none;
}

.bottom-cta-card .cta-icon {
    font-size: 1.5rem;
    margin-bottom: 10px;
    display: block;
}

.bottom-cta-card h3 {
    font-size: 1.05rem;
    margin: 0 0 8px 0;
    color: var(--learn-primary-dark);
}

.bottom-cta-card .cta-meta {
    font-size: 13px;
    color: var(--learn-text-muted);
    margin: 0 0 10px 0;
}

.bottom-cta-card .cta-action {
    font-size: 14px;
    font-weight: 600;
    color: var(--learn-primary);
}

@media (max-width: 640px) {
    .deeper-cta-grid,
    .bottom-cta-grid {
        grid-template-columns: 1fr;
    }
}

/* ═══ QUIZ SECTION ═══ */
#quiz-container {
    margin-top: 24px;
}

.quiz-progress {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    font-size: 14px;
    color: var(--learn-text-muted);
}

.quiz-progress-bar {
    flex: 1;
    height: 6px;
    background: var(--learn-border);
    border-radius: 3px;
    margin: 0 16px;
    overflow: hidden;
}

.quiz-progress-fill {
    height: 100%;
    background: var(--learn-primary);
    border-radius: 3px;
    transition: width 0.4s ease;
}

.quiz-question-card {
    background: var(--learn-bg);
    border: 2px solid var(--learn-border);
    border-radius: var(--learn-radius-lg);
    padding: 32px;
    margin-bottom: 24px;
    transition: border-color 0.3s;
}

.quiz-question-card.answered {
    border-color: var(--learn-border-dark);
}

.quiz-question-number {
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--learn-primary);
    margin-bottom: 12px;
}

.quiz-question-text {
    font-size: 17px;
    font-weight: 600;
    line-height: 1.5;
    margin-bottom: 24px;
    color: var(--learn-text);
}

.quiz-question-text code {
    background: var(--learn-primary-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
}

.quiz-answers {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

.quiz-answer {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 14px 18px;
    border: 2px solid var(--learn-border);
    border-radius: var(--learn-radius-sm);
    cursor: pointer;
    transition: all 0.2s;
    font-size: 15px;
    line-height: 1.5;
}

.quiz-answer:hover:not(.disabled) {
    border-color: var(--learn-primary-light);
    background: var(--learn-primary-bg);
}

.quiz-answer.selected {
    border-color: var(--learn-primary);
    background: var(--learn-primary-bg);
}

.quiz-answer.correct {
    border-color: var(--learn-success);
    background: var(--learn-success-bg);
}

.quiz-answer.incorrect {
    border-color: var(--learn-danger);
    background: var(--learn-danger-bg);
}

.quiz-answer.disabled {
    cursor: default;
    opacity: 0.7;
}

.quiz-answer.disabled.correct {
    opacity: 1;
}

.quiz-answer-marker {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    min-width: 28px;
    border-radius: 50%;
    border: 2px solid var(--learn-border-dark);
    font-size: 13px;
    font-weight: 700;
    color: var(--learn-text-muted);
    transition: all 0.2s;
    margin-top: 1px;
}

.quiz-answer.selected .quiz-answer-marker {
    background: var(--learn-primary);
    border-color: var(--learn-primary);
    color: #fff;
}

.quiz-answer.correct .quiz-answer-marker {
    background: var(--learn-success);
    border-color: var(--learn-success);
    color: #fff;
}

.quiz-answer.incorrect .quiz-answer-marker {
    background: var(--learn-danger);
    border-color: var(--learn-danger);
    color: #fff;
}

.quiz-answer-text {
    flex: 1;
}

/* Check Answer / Next buttons */
.quiz-actions {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

.quiz-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--learn-radius-sm);
    font-size: 15px;
    font-weight: 600;
    font-family: inherit;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
}

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

.quiz-btn-check {
    background: var(--learn-primary);
    color: #fff;
}

.quiz-btn-check:hover:not(:disabled) {
    background: var(--learn-primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(42,158,166,0.3);
}

.quiz-btn-next {
    background: var(--learn-bg-alt);
    color: var(--learn-text);
    border: 2px solid var(--learn-border);
}

.quiz-btn-next:hover:not(:disabled) {
    background: var(--learn-border);
}

/* Explanation */
.quiz-explanation {
    margin-top: 20px;
    padding: 20px 24px;
    border-radius: var(--learn-radius);
    font-size: 15px;
    line-height: 1.7;
    display: none;
}

.quiz-explanation.visible {
    display: block;
}

.quiz-explanation.correct {
    background: var(--learn-success-bg);
    border-left: 4px solid var(--learn-success);
}

.quiz-explanation.incorrect {
    background: var(--learn-danger-bg);
    border-left: 4px solid var(--learn-danger);
}

.quiz-explanation-label {
    font-weight: 700;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
}

.quiz-explanation.correct .quiz-explanation-label {
    color: #059669;
}

.quiz-explanation.incorrect .quiz-explanation-label {
    color: #DC2626;
}

/* ═══ QUIZ RESULTS ═══ */
#quiz-results {
    margin-top: 40px;
}

.results-card {
    background: var(--learn-bg);
    border: 2px solid var(--learn-border);
    border-radius: var(--learn-radius-lg);
    padding: 40px;
    text-align: center;
}

.results-score {
    font-size: 4rem;
    font-weight: 800;
    color: var(--learn-primary);
    line-height: 1;
    margin-bottom: 8px;
}

.results-score.good {
    color: var(--learn-success);
}

.results-score.needs-work {
    color: var(--learn-warning);
}

.results-score.poor {
    color: var(--learn-danger);
}

.results-label {
    font-size: 16px;
    color: var(--learn-text-muted);
    margin-bottom: 24px;
}

.results-message {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--learn-text);
}

.results-detail {
    font-size: 15px;
    color: var(--learn-text-muted);
    margin-bottom: 32px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.results-cta {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.results-cta .btn-primary {
    background: var(--learn-primary);
    color: #fff;
    padding: 14px 32px;
    border-radius: var(--learn-radius);
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
    border: none;
}

.results-cta .btn-primary:hover {
    background: var(--learn-primary-dark);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(42,158,166,0.35);
}

.results-cta .btn-secondary {
    color: var(--learn-primary);
    font-weight: 600;
    font-size: 15px;
    text-decoration: none;
}

.results-cta .btn-secondary:hover {
    color: var(--learn-primary-dark);
}

.results-note {
    margin-top: 16px;
    font-size: 13px;
    color: var(--learn-text-light);
}

/* ═══ CTA SECTION ═══ */
.cta-section {
    background: linear-gradient(135deg, #0F172A, #1E293B);
    color: #fff;
    border-radius: var(--learn-radius-lg);
    padding: 48px 40px;
    margin: 48px 0;
    text-align: center;
}

.cta-section h2 {
    color: #fff;
    font-size: 1.75rem;
    margin-bottom: 16px;
}

.cta-section p {
    color: #CBD5E1;
    font-size: 16px;
    max-width: 600px;
    margin: 0 auto 16px;
}

.cta-section ul {
    list-style: none;
    padding: 0;
    text-align: left;
    max-width: 500px;
    margin: 0 auto 32px;
}

.cta-section li {
    color: #E2E8F0;
    padding: 6px 0;
    font-size: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.cta-section li::before {
    content: '✓';
    color: var(--learn-success);
    font-weight: 700;
    font-size: 16px;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.cta-buttons .btn-primary {
    background: var(--learn-primary);
    color: #fff;
    padding: 14px 28px;
    border-radius: var(--learn-radius);
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.cta-buttons .btn-primary:hover {
    background: var(--learn-primary-light);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(42,158,166,0.4);
}

.cta-buttons .btn-secondary {
    background: rgba(255,255,255,0.1);
    color: #fff;
    padding: 14px 28px;
    border-radius: var(--learn-radius);
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    border: 2px solid rgba(255,255,255,0.2);
    transition: all 0.2s;
}

.cta-buttons .btn-secondary:hover {
    background: rgba(255,255,255,0.15);
    color: #fff;
    border-color: rgba(255,255,255,0.3);
}

.cta-note {
    font-size: 13px;
    color: #94A3B8;
    margin-top: 8px;
}

/* ═══ FAQ SECTION ═══ */
.faq-section {
    margin: 48px 0;
}

.faq-item {
    border: 1px solid var(--learn-border);
    border-radius: var(--learn-radius);
    margin-bottom: 12px;
    overflow: hidden;
}

.faq-item summary {
    padding: 18px 24px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background 0.2s;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: '+';
    font-size: 20px;
    font-weight: 300;
    color: var(--learn-text-muted);
    transition: transform 0.2s;
}

.faq-item[open] summary::after {
    content: '−';
}

.faq-item summary:hover {
    background: var(--learn-bg-alt);
}

.faq-item .faq-answer {
    padding: 0 24px 18px;
    font-size: 15px;
    line-height: 1.7;
    color: #334155;
}

/* ═══ RELATED TOPICS ═══ */
.related-topics {
    margin: 48px 0;
}

.related-topics h2 {
    text-align: center;
    margin-bottom: 24px;
}

.topic-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
}

.topic-card {
    display: block;
    padding: 24px;
    border: 2px solid var(--learn-border);
    border-radius: var(--learn-radius);
    text-decoration: none;
    transition: all 0.2s;
}

.topic-card:hover {
    border-color: var(--learn-primary-light);
    background: var(--learn-primary-bg);
    transform: translateY(-2px);
    box-shadow: var(--learn-shadow);
}

.topic-card h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--learn-text);
    margin-bottom: 6px;
}

.topic-card p {
    font-size: 13px;
    color: var(--learn-text-muted);
    margin: 0;
}

.topic-card .cert-badge {
    display: inline-block;
    background: var(--learn-primary-bg);
    color: var(--learn-primary);
    font-size: 11px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 4px;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ═══ FOOTER ═══ */
.learn-footer {
    background: var(--learn-bg-dark);
    color: #CBD5E1;
    padding: 64px 24px 32px;
    margin-top: 80px;
}

.learn-footer-inner {
    max-width: var(--learn-max-w);
    margin: 0 auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h4 {
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #F8FAFC;
    margin-bottom: 16px;
}

.footer-col a {
    display: block;
    font-size: 14px;
    color: #94A3B8;
    text-decoration: none;
    padding: 4px 0;
    transition: color 0.2s;
}

.footer-col a:hover {
    color: #fff;
}

.footer-bottom {
    border-top: 1px solid #1E293B;
    padding-top: 24px;
    text-align: center;
    font-size: 13px;
    color: #64748B;
}

/* ═══ MOBILE RESPONSIVE ═══ */
@media (max-width: 768px) {
    .learn-nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 16px 24px;
        border-bottom: 1px solid var(--learn-border);
        box-shadow: var(--learn-shadow);
        gap: 12px;
    }

    .learn-nav-links.open {
        display: flex;
    }

    .learn-nav-toggle {
        display: block;
    }

    .learn-content h1 {
        font-size: 1.75rem;
    }

    .learn-content h2 {
        font-size: 1.3rem;
    }

    .quiz-question-card {
        padding: 20px;
    }

    .quiz-answer {
        padding: 12px 14px;
    }

    .results-card {
        padding: 28px 20px;
    }

    .results-score {
        font-size: 3rem;
    }

    .cta-section {
        padding: 32px 24px;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }

    .cta-buttons .btn-primary,
    .cta-buttons .btn-secondary {
        width: 100%;
        text-align: center;
        justify-content: center;
    }

    .topic-cards {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 24px;
    }
}

@media (max-width: 480px) {
    .learn-content h1 {
        font-size: 1.5rem;
    }

    .article-meta {
        font-size: 13px;
    }

    .toc {
        padding: 16px;
    }

    .quiz-question-card {
        padding: 16px;
    }

    .quiz-btn {
        width: 100%;
    }

    .quiz-actions {
        flex-direction: column;
    }
}

/* ══════════════════════════════════════════════════════════════════════
   TRENDING PAGES — BEM-style classes used by /learn/trending/ articles
   ══════════════════════════════════════════════════════════════════════ */

/* ═══ NAV (BEM) ═══ */
.nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--learn-bg);
    border-bottom: 1px solid var(--learn-border);
    padding: 0 24px;
}

.nav__container {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.nav__logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--learn-text);
    font-weight: 700;
    font-size: 18px;
}

.nav__logo img {
    border-radius: 6px;
}

.nav__toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    flex-direction: column;
    gap: 4px;
}

.nav__toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--learn-text);
    border-radius: 2px;
}

.nav__links {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav__link {
    padding: 8px 14px;
    border-radius: var(--learn-radius-sm);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    color: var(--learn-text-muted);
    transition: color 0.2s, background 0.2s;
}

.nav__link:hover {
    color: var(--learn-text);
    background: var(--learn-bg-alt);
}

.nav__link--active {
    color: var(--learn-primary);
    font-weight: 600;
}

.nav__link--cta {
    background: var(--learn-primary);
    color: white !important;
    font-weight: 600;
}

.nav__link--cta:hover {
    background: var(--learn-primary-dark);
}

@media (max-width: 768px) {
    .nav__toggle {
        display: flex;
    }

    .nav__links {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--learn-bg);
        border-bottom: 1px solid var(--learn-border);
        flex-direction: column;
        padding: 12px;
        box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    }

    .nav__links.open {
        display: flex;
    }

    .nav__link {
        width: 100%;
        text-align: center;
        padding: 12px;
    }
}

/* ═══ BREADCRUMBS (BEM) ═══ */
.breadcrumb {
    padding: 12px 24px;
    background: var(--learn-bg-alt);
    border-bottom: 1px solid var(--learn-border);
    font-size: 13px;
}

.breadcrumb__container {
    max-width: 1100px;
    margin: 0 auto;
}

.breadcrumb a {
    color: var(--learn-primary);
    text-decoration: none;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

.breadcrumb__sep {
    margin: 0 6px;
    color: var(--learn-text-light);
}

.breadcrumb__current {
    color: var(--learn-text-muted);
}

/* ═══ HERO (BEM) ═══ */
.learn-hero {
    padding: 48px 24px 32px;
    background: linear-gradient(180deg, var(--learn-bg-alt) 0%, var(--learn-bg) 100%);
}

.learn-hero__container {
    max-width: 800px;
    margin: 0 auto;
}

.learn-hero__badge {
    display: inline-block;
    background: var(--learn-primary-bg);
    color: var(--learn-primary);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 16px;
}

.learn-hero__title {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--learn-text);
    margin: 0 0 16px 0;
    line-height: 1.2;
}

.learn-hero__subtitle {
    font-size: 17px;
    color: var(--learn-text-muted);
    line-height: 1.6;
    margin: 0 0 16px 0;
}

.learn-hero__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 13px;
    color: var(--learn-text-light);
}

@media (max-width: 640px) {
    .learn-hero__title {
        font-size: 1.6rem;
    }
}

/* ═══ CONTENT (BEM) ═══ */
.learn-content__container {
    max-width: 800px;
    margin: 0 auto;
    padding: 32px 24px;
}

/* ═══ TOC (BEM, reuse existing .toc if needed) ═══ */
.toc__title {
    font-size: 16px;
    font-weight: 700;
    margin: 0 0 12px 0;
    color: var(--learn-text);
}

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

.toc__list li {
    margin-bottom: 8px;
}

.toc__list li::before {
    content: "\2192";
    color: var(--learn-primary);
    margin-right: 8px;
}

.toc__list a {
    color: var(--learn-primary);
    text-decoration: none;
    font-size: 15px;
}

.toc__list a:hover {
    text-decoration: underline;
}

/* ═══ INFO BOXES (trending) ═══ */
.info-box {
    border-radius: var(--learn-radius);
    padding: 20px;
    margin: 24px 0;
}

.info-box--important {
    background: var(--learn-primary-bg);
    border: 1px solid rgba(42,158,166,0.2);
}

.info-box--tip {
    background: var(--learn-success-bg);
    border: 1px solid rgba(16,185,129,0.2);
}

.info-box--exam {
    background: var(--learn-warning-bg);
    border: 1px solid rgba(245,158,11,0.2);
}

.info-box__title {
    font-weight: 700;
    font-size: 15px;
    margin: 0 0 8px 0;
}

.info-box__content {
    font-size: 14px;
    line-height: 1.6;
}

.info-box__content p {
    margin: 0;
}

/* ═══ FAQ (BEM — trending style) ═══ */
.faq {
    margin: 32px 0;
}

.faq__item {
    border-bottom: 1px solid var(--learn-border);
    padding: 16px 0;
}

.faq__question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-weight: 600;
    font-size: 15px;
    color: var(--learn-text);
    background: none;
    border: none;
    width: 100%;
    text-align: left;
    padding: 0;
}

.faq__icon {
    font-size: 18px;
    color: var(--learn-text-light);
    transition: transform 0.2s;
    flex-shrink: 0;
    margin-left: 16px;
}

.faq__answer {
    display: none;
    padding-top: 12px;
    font-size: 14px;
    color: var(--learn-text-muted);
    line-height: 1.6;
}

.faq__item.open .faq__answer {
    display: block;
}

.faq__item.open .faq__icon {
    transform: rotate(45deg);
}

/* ═══ QUIZ (BEM — trending) ═══ */
.quiz {
    margin: 32px 0;
}

.quiz__header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.quiz__badge {
    background: var(--learn-primary-bg);
    color: var(--learn-primary);
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.quiz__count {
    font-size: 13px;
    color: var(--learn-text-muted);
}

.quiz__results {
    margin-top: 16px;
    padding: 20px;
    background: var(--learn-bg-alt);
    border-radius: var(--learn-radius);
    text-align: center;
}

/* ═══ STUDY GUIDE PROMO (BEM — trending) ═══ */
.study-guide-promo__icon {
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.study-guide-promo__content {
    flex: 1;
}

.study-guide-promo__link {
    display: inline-block;
    margin-top: 8px;
    color: var(--learn-primary);
    font-weight: 600;
    text-decoration: none;
}

.study-guide-promo__link:hover {
    text-decoration: underline;
}

/* ═══ RELATED TOPICS (BEM — trending) ═══ */
.related-topics__title {
    font-size: 1.25rem;
    margin: 0 0 16px 0;
}

.related-topics__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 16px;
}

.related-topics__card {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px;
    border: 1px solid var(--learn-border);
    border-radius: var(--learn-radius);
    text-decoration: none;
    color: var(--learn-text);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.related-topics__card:hover {
    border-color: var(--learn-primary);
    box-shadow: 0 2px 8px rgba(42,158,166,0.1);
}

.related-topics__icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.related-topics__name {
    font-weight: 600;
    font-size: 14px;
    margin: 0 0 4px 0;
    color: var(--learn-primary-dark);
}

.related-topics__desc {
    font-size: 13px;
    color: var(--learn-text-muted);
    margin: 0;
    line-height: 1.4;
}

/* ═══ FOOTER (BEM — trending) ═══ */
.footer {
    background: var(--learn-bg-dark);
    color: #94A3B8;
    padding: 48px 24px 24px;
    margin-top: 48px;
}

.footer__container {
    max-width: 1100px;
    margin: 0 auto;
}

.footer__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 32px;
    margin-bottom: 32px;
}

.footer__col {
    display: flex;
    flex-direction: column;
}

.footer__title {
    color: white;
    font-weight: 600;
    font-size: 14px;
    margin: 0 0 12px 0;
}

.footer__links {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer__links a {
    color: #94A3B8;
    text-decoration: none;
    font-size: 13px;
}

.footer__links a:hover {
    color: white;
}

.footer__bottom {
    border-top: 1px solid #1E293B;
    padding-top: 20px;
    text-align: center;
    font-size: 13px;
}

/* ═══ RELATED BADGE ═══ */
.related-badge {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--learn-primary);
    background: var(--learn-primary-bg);
    padding: 2px 8px;
    border-radius: 4px;
    margin-bottom: 8px;
}

/* ═══ COMPARISON TABLE (trending) ═══ */
.comparison-table-wrapper {
    overflow-x: auto;
    margin: 24px 0;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.comparison-table th,
.comparison-table td {
    padding: 12px 16px;
    text-align: left;
    border: 1px solid var(--learn-border);
}

.comparison-table th {
    background: var(--learn-bg-alt);
    font-weight: 600;
    color: var(--learn-text);
}

.comparison-table tr:hover {
    background: var(--learn-bg-alt);
}