/* Learn library - catalog, tool docs, sidebar */

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.modern-page.learn-page {
    --learn-sidebar: 280px;
}

.modern-page.learn-page .page-main {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.25rem;
}

.modern-page.learn-page .learn-container {
    display: flex;
    gap: 2rem;
    padding: 1.5rem 0 4rem;
    align-items: flex-start;
}

.modern-page.learn-page .learn-sidebar {
    flex: 0 0 var(--learn-sidebar);
    position: sticky;
    top: calc(var(--site-nav-height) + 1rem);
    left: auto;
    align-self: flex-start;
    width: var(--learn-sidebar);
    max-height: calc(100vh - var(--site-nav-height) - 2rem);
    height: auto;
    overflow-y: auto;
    padding: 0 0.25rem 1rem 0;
    background: transparent;
}

.modern-page.learn-page .learn-sidebar::-webkit-scrollbar { width: 6px; }
.modern-page.learn-page .learn-sidebar::-webkit-scrollbar-thumb {
    background: #d2d2d7;
    border-radius: 3px;
}

.modern-page.learn-page .learn-content {
    flex: 1;
    min-width: 0;
    margin-left: 0;
    padding-left: 0;
    border-left: none;
    min-height: 0;
}

.sidebar-search-wrap,
.catalog-search-wrap {
    display: block;
    margin: 0 0 0.85rem;
}

.sidebar-search,
.catalog-search {
    width: 100%;
    border: 1px solid var(--site-border);
    border-radius: 12px;
    padding: 0.65rem 0.85rem;
    font: inherit;
    font-size: 0.9375rem;
    background: #fff;
    color: var(--site-text);
}

.sidebar-search:focus,
.catalog-search:focus {
    outline: none;
    border-color: var(--site-accent);
    box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.15);
}

.catalog-search {
    font-size: 1.0625rem;
    padding: 0.9rem 1.1rem;
    border-radius: 16px;
    max-width: 640px;
}

.catalog-search-status {
    margin: 0.75rem 0 0;
    color: var(--site-text-secondary);
    font-size: 0.9375rem;
}

.modern-page.learn-page .sidebar-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.modern-page.learn-page .sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.45rem 0.7rem;
    text-decoration: none;
    color: var(--site-text);
    font-size: 0.8125rem;
    line-height: 1.3;
    border-radius: 10px;
    border: none;
    background: transparent;
    transition: background 0.15s ease, color 0.15s ease;
}

.sidebar-tool-icon {
    width: 16px;
    height: 16px;
    flex: 0 0 16px;
    object-fit: contain;
    image-rendering: -webkit-optimize-contrast;
}

.modern-page.learn-page .sidebar-nav a:hover {
    background: var(--site-bg-secondary);
    color: var(--site-text);
}

.modern-page.learn-page .sidebar-nav a.active {
    background: rgba(0, 113, 227, 0.1);
    color: var(--site-accent);
    font-weight: 600;
}

.modern-page.learn-page .sidebar-nav ul.nested {
    display: none;
    padding-left: 0.7rem;
    border-left: 1px solid var(--site-border);
    margin: 0.15rem 0 0.15rem 0.7rem;
}

.modern-page.learn-page .sidebar-nav ul.nested.expanded {
    display: block;
}

.modern-page.learn-page .sidebar-nav a.nav-toggle {
    font-weight: 600;
}

.modern-page.learn-page .sidebar-nav a.nav-toggle::before {
    content: "+";
    font-size: 0.85em;
    margin-right: 0.15rem;
    color: var(--site-text-secondary);
}

.modern-page.learn-page .sidebar-nav a.nav-toggle.expanded::before {
    content: "−";
}

.sidebar-nav li.is-filtered-out {
    display: none;
}

.learn-welcome h1 {
    font-size: clamp(2rem, 4vw, 2.85rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    margin: 0 0 0.75rem;
}

.learn-lead {
    font-size: 1.125rem;
    line-height: 1.55;
    color: var(--site-text-secondary);
    margin: 0 0 1.5rem;
    max-width: 46rem;
}

.learn-workflows {
    margin: 2.5rem 0 3rem;
}

.learn-workflows h2,
.catalog-panel-head h2 {
    font-size: 1.35rem;
    font-weight: 650;
    letter-spacing: -0.02em;
    margin: 0 0 0.35rem;
}

.workflow-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.workflow-card {
    background: var(--site-bg-secondary);
    border-radius: var(--site-radius);
    padding: 1.35rem 1.4rem;
}

.workflow-card h3 {
    font-size: 1.05rem;
    margin: 0 0 0.45rem;
}

.workflow-card p {
    margin: 0;
    color: var(--site-text-secondary);
    font-size: 0.9375rem;
    line-height: 1.5;
}

.workflow-tools {
    margin-top: 0.7rem !important;
    font-size: 0.8125rem !important;
}

.workflow-tools a {
    color: var(--site-accent);
    text-decoration: none;
    font-weight: 500;
}

.workflow-tools a:hover {
    text-decoration: underline;
}

.catalog-panel {
    margin-bottom: 2.5rem;
    scroll-margin-top: calc(var(--site-nav-height) + 1rem);
}

.catalog-panel-head {
    display: flex;
    align-items: flex-start;
    gap: 0.85rem;
    margin-bottom: 1rem;
}

.catalog-panel-head img {
    width: 28px;
    height: 28px;
    margin-top: 0.2rem;
    object-fit: contain;
    image-rendering: -webkit-optimize-contrast;
}

.catalog-panel-head p {
    margin: 0;
    color: var(--site-text-secondary);
    font-size: 0.9375rem;
    line-height: 1.45;
}

.catalog-count {
    margin-left: auto;
    color: var(--site-accent);
    font-size: 0.8125rem;
    font-weight: 600;
    white-space: nowrap;
}

.catalog-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
}

.catalog-card {
    display: flex;
    gap: 0.85rem;
    align-items: flex-start;
    padding: 1rem 1.05rem;
    border: 1px solid var(--site-border);
    border-radius: 16px;
    text-decoration: none;
    color: inherit;
    background: #fff;
    transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.catalog-card:hover {
    border-color: rgba(0, 113, 227, 0.35);
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.06);
    text-decoration: none;
}

.catalog-card img {
    width: 32px;
    height: 32px;
    flex: 0 0 32px;
    object-fit: contain;
    image-rendering: -webkit-optimize-contrast;
}

.catalog-card strong {
    display: block;
    font-size: 0.95rem;
    margin-bottom: 0.2rem;
}

.catalog-card em {
    font-style: normal;
    color: var(--site-text-secondary);
    font-size: 0.8125rem;
    line-height: 1.4;
    display: block;
}

.catalog-card.is-hidden,
.catalog-panel.is-hidden {
    display: none;
}

/* Tool documentation */
.tool-doc {
    max-width: 760px;
}

.tool-crumbs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    align-items: center;
    font-size: 0.8125rem;
    color: var(--site-text-secondary);
    margin-bottom: 1.25rem;
}

.tool-crumbs a {
    color: var(--site-accent);
    text-decoration: none;
}

.tool-crumbs a:hover { text-decoration: underline; }

.tool-crumb-sep { opacity: 0.5; }

.tool-hero {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    margin-bottom: 1.75rem;
}

.tool-hero-icon {
    width: 64px;
    height: 64px;
    object-fit: contain;
    flex: 0 0 64px;
    background: var(--site-bg-secondary);
    border-radius: 12px;
    padding: 8px;
    image-rendering: -webkit-optimize-contrast;
}

.tool-kicker {
    margin: 0 0 0.35rem;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--site-accent);
    letter-spacing: 0.01em;
}

.tool-hero h1,
.tool-doc h1 {
    font-size: clamp(1.85rem, 3vw, 2.4rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    margin: 0 0 0.5rem;
    line-height: 1.15;
}

.tool-lede {
    margin: 0;
    font-size: 1.125rem;
    line-height: 1.5;
    color: var(--site-text-secondary);
}

.tool-callouts {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.85rem;
    margin: 0 0 2rem;
}

.tool-callout {
    background: var(--site-bg-secondary);
    border-radius: 16px;
    padding: 1.15rem 1.2rem;
}

.tool-callout h2,
.tool-how h2,
.tool-notes h2,
.tool-related h2 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--site-text-secondary);
    margin: 0 0 0.5rem;
    font-weight: 650;
}

.tool-how h2,
.tool-notes h2,
.tool-related h2 {
    font-size: 1.15rem;
    text-transform: none;
    letter-spacing: -0.02em;
    color: var(--site-text);
    margin-bottom: 1rem;
}

.tool-callout p,
.tool-how p,
.tool-notes li,
.tool-steps p {
    margin: 0;
    color: var(--site-text-secondary);
    font-size: 0.975rem;
    line-height: 1.55;
}

.tool-steps {
    margin: 0;
    padding: 0;
    list-style: none;
    counter-reset: step;
}

.tool-steps > li {
    position: relative;
    padding: 0 0 1.4rem 2.6rem;
    border-left: 1px solid var(--site-border);
    margin-left: 0.7rem;
}

.tool-steps > li:last-child {
    border-left-color: transparent;
    padding-bottom: 0;
}

.tool-steps > li::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: -0.7rem;
    top: 0;
    width: 1.4rem;
    height: 1.4rem;
    border-radius: 50%;
    background: var(--site-accent);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 650;
    display: flex;
    align-items: center;
    justify-content: center;
}

.tool-steps h3 {
    margin: 0 0 0.35rem;
    font-size: 1.05rem;
    font-weight: 650;
    letter-spacing: -0.02em;
}

.tool-steps ul {
    margin: 0.5rem 0 0;
    padding-left: 1.1rem;
    color: var(--site-text-secondary);
}

.tool-figure {
    margin: 1.5rem 0;
}

.tool-figure img,
.modern-page.learn-page .content-section img {
    display: block;
    max-width: 100%;
    width: auto;
    height: auto;
    border-radius: 0;
    border: 1px solid var(--site-border);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
    background: #fff;
}

.tool-figure figcaption {
    margin-top: 0.65rem;
    font-size: 0.875rem;
    color: var(--site-text-secondary);
}

.tool-notes ul {
    margin: 0;
    padding-left: 1.15rem;
}

.tool-notes li + li { margin-top: 0.45rem; }

.tool-related {
    margin: 2.25rem 0 1.5rem;
}

.tool-related-grid {
    display: grid;
    gap: 0.7rem;
}

.tool-related-card {
    display: flex;
    gap: 0.75rem;
    align-items: flex-start;
    padding: 0.9rem 1rem;
    border: 1px solid var(--site-border);
    border-radius: 14px;
    text-decoration: none;
    color: inherit;
}

.tool-related-card:hover {
    border-color: rgba(0, 113, 227, 0.35);
    text-decoration: none;
}

.tool-related-card img {
    width: 28px;
    height: 28px;
    border: 0;
    box-shadow: none;
    padding: 0;
    image-rendering: -webkit-optimize-contrast;
}

.tool-related-card strong {
    display: block;
    font-size: 0.9375rem;
}

.tool-related-card em {
    font-style: normal;
    color: var(--site-text-secondary);
    font-size: 0.8125rem;
}

.tool-pager {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    margin-top: 2.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--site-border);
}

.tool-pager-link {
    text-decoration: none;
    color: inherit;
    max-width: 46%;
}

.tool-pager-next { text-align: right; margin-left: auto; }

.tool-pager-link span {
    display: block;
    font-size: 0.75rem;
    color: var(--site-text-secondary);
    margin-bottom: 0.2rem;
}

.tool-pager-link strong {
    font-size: 0.95rem;
    color: var(--site-accent);
}

.mobile-tools-toggle {
    display: none;
}

@media (max-width: 960px) {
    .catalog-grid,
    .workflow-grid,
    .tool-callouts {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .mobile-tools-toggle {
        display: inline-flex;
        margin-bottom: 1rem;
        border: 1px solid var(--site-border);
        background: #fff;
        border-radius: 980px;
        padding: 0.45rem 0.9rem;
        font: inherit;
        font-size: 0.875rem;
        cursor: pointer;
    }

    .modern-page.learn-page .learn-container {
        flex-direction: column;
        gap: 1rem;
    }

    .modern-page.learn-page .learn-sidebar {
        position: static;
        max-height: 0;
        overflow: hidden;
        flex: none;
        width: 100%;
        padding: 0;
        opacity: 0;
    }

    .modern-page.learn-page .learn-sidebar.is-open {
        max-height: 70vh;
        overflow-y: auto;
        opacity: 1;
        padding-bottom: 1rem;
        border-bottom: 1px solid var(--site-border);
    }

    .catalog-count { display: none; }
}