/* Learn Section Styles */

/* ── Hub Landing ────────────────────────────── */
.learn-landing {
    position: relative;
    z-index: 5;
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px 80px;
    animation: fadeIn 0.8s ease-out 0.3s both;
}

/* Hero */
.learn-hero {
    text-align: center;
    margin-bottom: 48px;
}

.learn-hero-content {
    max-width: 700px;
    margin: 0 auto;
}

.learn-hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -1px;
    background: linear-gradient(135deg, var(--white), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.learn-hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 28px;
}

.learn-search-box {
    position: relative;
    max-width: 480px;
    margin: 0 auto;
}

.learn-search-input {
    width: 100%;
    padding: 16px 20px 16px 48px;
    background: var(--glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    color: var(--white);
    font-size: 0.95rem;
    transition: all 0.3s;
}

.learn-search-input::placeholder {
    color: var(--text-muted);
}

.learn-search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.learn-search-box .search-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

/* Stats bar */
.learn-stats {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.learn-stat {
    text-align: center;
}

.learn-stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
}

.learn-stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Section headers */
.learn-section-header {
    margin-bottom: 20px;
}

.learn-section-title {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin: 0 0 4px 4px;
}

/* ── Category Cards ────────────────────────────── */
.learn-categories {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

.learn-category-card {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 24px;
    background: var(--glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    text-decoration: none;
    color: var(--white);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.learn-category-card:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--primary);
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(99, 102, 241, 0.15);
}

.learn-category-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
}

.learn-category-icon i {
    width: 24px;
    height: 24px;
    color: var(--white);
}

.learn-category-content {
    flex: 1;
    min-width: 0;
}

.learn-category-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin: 0 0 6px 0;
    color: var(--white);
}

.learn-category-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin: 0 0 10px 0;
    line-height: 1.5;
}

.learn-category-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.learn-category-arrow {
    flex-shrink: 0;
    color: var(--text-muted);
    transition: all 0.3s;
    align-self: center;
    opacity: 0.6;
}

.learn-category-arrow i {
    width: 20px;
    height: 20px;
}

.learn-category-card:hover .learn-category-arrow {
    transform: translateX(4px);
    color: var(--primary);
    opacity: 1;
}

/* ── Article Cards ────────────────────────────── */
.learn-articles-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

.learn-article-card {
    display: flex;
    flex-direction: column;
    padding: 24px;
    background: var(--glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    text-decoration: none;
    color: var(--white);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.learn-article-card:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--primary);
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(99, 102, 241, 0.15);
}

.learn-article-card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.learn-article-card-title {
    font-size: 1.05rem;
    font-weight: 700;
    margin: 0 0 8px 0;
    color: var(--white);
    line-height: 1.4;
}

.learn-article-card-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin: 0 0 16px 0;
    line-height: 1.5;
    flex: 1;
}

.learn-article-card-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

/* Difficulty badge */
.difficulty-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    border-radius: 16px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.difficulty-badge.beginner {
    background: rgba(16, 185, 129, 0.15);
    color: #10b981;
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.difficulty-badge.intermediate {
    background: rgba(245, 158, 11, 0.15);
    color: #f59e0b;
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.difficulty-badge.advanced {
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.read-time {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 4px;
}

.read-time i {
    width: 14px;
    height: 14px;
}

.schema-badge {
    font-size: 0.7rem;
    padding: 2px 8px;
    background: rgba(99, 102, 241, 0.15);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 10px;
    color: var(--primary-light);
}

/* ── CTA Banner ────────────────────────────── */
.learn-cta {
    background: var(--glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
    margin-top: 40px;
}

.learn-cta-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--white);
    margin: 0 0 8px 0;
}

.learn-cta-text {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin: 0 0 20px 0;
}

.learn-cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    background: linear-gradient(135deg, var(--primary), #8b5cf6);
    color: var(--white);
    border: none;
    border-radius: 12px;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s;
}

.learn-cta-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.3);
}

.learn-cta-btn i {
    width: 18px;
    height: 18px;
}

/* ── Category Page Layout ────────────────────── */
.learn-page {
    position: relative;
    z-index: 5;
    max-width: 1200px;
    margin: 0 auto;
    padding: 32px 20px 80px;
    display: flex;
    gap: 32px;
    animation: fadeIn 0.8s ease-out 0.3s both;
}

.learn-sidebar {
    width: 260px;
    flex-shrink: 0;
    position: sticky;
    top: 100px;
    align-self: flex-start;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
}

.learn-sidebar-card {
    background: var(--glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    padding: 20px;
    margin-bottom: 16px;
}

.learn-sidebar-title {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin: 0 0 12px 0;
}

.learn-sidebar-link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    border-radius: 8px;
    transition: all 0.2s;
    margin-bottom: 2px;
}

.learn-sidebar-link:hover {
    background: rgba(99, 102, 241, 0.12);
    color: var(--primary-light);
}

.learn-sidebar-link.active {
    background: rgba(99, 102, 241, 0.15);
    color: var(--primary-light);
    font-weight: 600;
}

.learn-sidebar-link i {
    width: 16px;
    height: 16px;
    opacity: 0.7;
}

.learn-main {
    flex: 1;
    min-width: 0;
}

/* Breadcrumb */
.learn-breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 24px;
    font-size: 0.85rem;
    flex-wrap: wrap;
}

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

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

.learn-breadcrumb .separator {
    color: var(--text-muted);
    opacity: 0.5;
}

.learn-breadcrumb .current {
    color: var(--text-secondary);
}

/* Category page header */
.learn-category-header {
    margin-bottom: 32px;
}

.learn-category-header h1 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--white);
    margin: 0 0 8px 0;
}

.learn-category-header p {
    font-size: 1rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
}

/* ── Article Page ────────────────────────────── */
.learn-article-header {
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--glass-border);
}

.learn-article-header h1 {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--white);
    margin: 0 0 16px 0;
    line-height: 1.3;
}

.learn-article-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.learn-article-date {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 4px;
}

.learn-article-date i {
    width: 14px;
    height: 14px;
}

/* Article content */
.learn-article-body {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 1rem;
}

.learn-article-body h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
    margin: 40px 0 16px 0;
    padding-top: 16px;
    scroll-margin-top: 100px;
}

.learn-article-body h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--white);
    margin: 28px 0 12px 0;
    scroll-margin-top: 100px;
}

.learn-article-body p {
    margin: 0 0 16px 0;
}

.learn-article-body ul,
.learn-article-body ol {
    margin: 0 0 16px 0;
    padding-left: 24px;
}

.learn-article-body li {
    margin-bottom: 6px;
}

.learn-article-body blockquote {
    margin: 20px 0;
    padding: 16px 20px;
    background: rgba(99, 102, 241, 0.08);
    border-left: 3px solid var(--primary);
    border-radius: 0 10px 10px 0;
    color: var(--text-secondary);
}

.learn-article-body blockquote p {
    margin: 0;
}

.learn-article-body code {
    background: rgba(255, 255, 255, 0.08);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--primary-light);
}

.learn-article-body pre {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    padding: 16px 20px;
    overflow-x: auto;
    margin: 0 0 20px 0;
}

.learn-article-body pre code {
    background: none;
    padding: 0;
    color: var(--text-secondary);
}

.learn-article-body a {
    color: var(--primary-light);
    text-decoration: underline;
    text-decoration-color: rgba(99, 102, 241, 0.3);
    text-underline-offset: 2px;
    transition: text-decoration-color 0.2s;
}

.learn-article-body a:hover {
    text-decoration-color: var(--primary-light);
}

/* Wrap tables for mobile horizontal scroll */
.learn-article-body .table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 0 0 20px 0;
}

.learn-article-body table {
    width: 100%;
    border-collapse: collapse;
    min-width: 400px;
}

.learn-article-body th,
.learn-article-body td {
    padding: 10px 14px;
    border: 1px solid var(--glass-border);
    text-align: left;
}

.learn-article-body th {
    background: rgba(255, 255, 255, 0.05);
    color: var(--white);
    font-weight: 600;
}

/* Table of contents (article sidebar) */
.learn-toc {
    list-style: none;
    padding: 0;
    margin: 0;
}

.learn-toc li {
    margin-bottom: 2px;
}

.learn-toc a {
    display: block;
    padding: 6px 12px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.8rem;
    border-radius: 6px;
    transition: all 0.2s;
    line-height: 1.4;
}

.learn-toc a:hover {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-light);
}

.learn-toc a.active {
    color: var(--primary-light);
    background: rgba(99, 102, 241, 0.12);
}

.learn-toc .toc-h3 {
    padding-left: 24px;
    font-size: 0.75rem;
}

/* Related articles */
.learn-related {
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--glass-border);
}

.learn-related-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--white);
    margin: 0 0 20px 0;
}

.learn-related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

/* "Learn how to improve" link in reports */
.learn-more-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    color: var(--primary-light);
    text-decoration: none;
    opacity: 0.8;
    transition: all 0.2s;
    margin-left: 8px;
}

.learn-more-link:hover {
    opacity: 1;
    text-decoration: underline;
}

.learn-more-link i {
    width: 14px;
    height: 14px;
}

/* ── JSON-LD Schema (hidden) ────────────────── */
.learn-schema {
    display: none;
}

/* ── Responsive ────────────────────────────── */
@media (max-width: 1024px) {
    .learn-sidebar {
        width: 220px;
    }

    .learn-articles-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .learn-hero-title {
        font-size: 2.2rem;
    }

    .learn-hero-subtitle {
        font-size: 1rem;
    }

    .learn-categories {
        grid-template-columns: 1fr;
    }

    .learn-category-arrow {
        display: none;
    }

    .learn-page {
        flex-direction: column;
    }

    .learn-sidebar {
        width: 100%;
        position: static;
        max-height: none;
    }

    /* Collapse sidebar cards on mobile — show as toggleable */
    .learn-sidebar-card {
        padding: 12px 16px;
    }

    .learn-sidebar-card .learn-sidebar-title {
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: space-between;
        margin-bottom: 0;
    }

    .learn-sidebar-card .learn-sidebar-title::after {
        content: '+';
        font-size: 1.1rem;
        color: var(--text-muted);
        font-weight: 400;
    }

    .learn-sidebar-card.expanded .learn-sidebar-title::after {
        content: '-';
    }

    .learn-sidebar-card .learn-sidebar-link,
    .learn-sidebar-card .learn-toc {
        display: none;
    }

    .learn-sidebar-card.expanded .learn-sidebar-link,
    .learn-sidebar-card.expanded .learn-toc {
        display: flex;
    }

    .learn-sidebar-card.expanded .learn-toc {
        display: block;
    }

    .learn-article-header h1 {
        font-size: 1.7rem;
    }

    .learn-stats {
        gap: 20px;
    }

    .learn-related-grid {
        grid-template-columns: 1fr;
    }
}