/* ===================================================
   LEARN ARTICLE PAGE - CreatorFlow
   ===================================================
   TOC sidebar + main content layout (matches guide-detail pattern)
   Brand: NO box-shadows, ONLY #000000 dark backgrounds, #d1fe17 lime accent
   =================================================== */

/* ===== CSS VARIABLES ===== */
:root {
    --learn-lime: #d1fe17;
    --learn-black: #000000;
    --learn-white: #ffffff;
    --learn-gray-50: #f9fafb;
    --learn-gray-100: #f3f4f6;
    --learn-gray-200: #e5e7eb;
    --learn-gray-400: #9ca3af;
    --learn-gray-600: #4b5563;
    --learn-gray-700: #374151;
}

/* ===== HERO SECTION ===== */
.learn-article-hero {
    padding: 9rem 0 2.5rem;
    background: var(--learn-white);
    text-align: center;
}

.learn-article-hero__container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 3rem;
}

/* Breadcrumb */
.learn-breadcrumb {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.8125rem;
    margin-bottom: 1.5rem;
}

.learn-breadcrumb-link {
    color: var(--learn-gray-600);
    text-decoration: none;
    transition: color 0.2s ease;
}

.learn-breadcrumb-link:hover {
    color: var(--learn-black);
}

.learn-breadcrumb-separator {
    color: var(--learn-gray-200);
}

.learn-breadcrumb-current {
    color: var(--learn-black);
    font-weight: 500;
}

/* Badge */
.learn-article-hero__badge {
    display: inline-block;
    background: var(--learn-black);
    color: var(--learn-lime);
    padding: 0.375rem 0.875rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-family: 'Stack Sans Headline', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* Title */
.learn-article-hero__title {
    font-size: clamp(1.75rem, 5vw, 2.75rem);
    font-weight: 800;
    color: var(--learn-black) !important;
    margin: 0 0 1rem;
    line-height: 1.15;
    letter-spacing: -0.02em;
    font-family: 'Stack Sans Headline', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* Reading time meta */
.learn-article-hero__meta {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    font-size: 0.8125rem;
    color: var(--learn-gray-600);
    margin-bottom: 1.5rem;
}

.learn-article-hero__meta-item {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.learn-article-hero__meta-separator {
    color: var(--learn-gray-200);
}

/* ===== VIDEO SECTION ===== */
.learn-article-video {
    max-width: 800px;
    margin: 0 auto 2rem;
    padding: 0 3rem;
}

.learn-article-video__wrapper {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 */
    border-radius: 0.5rem;
    overflow: hidden;
    border: 1px solid var(--learn-gray-200);
    background: var(--learn-black);
}

.learn-article-video__wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

/* ===== MAIN LAYOUT (TOC + Content) ===== */
.learn-article-layout {
    display: flex;
    max-width: 1100px;
    margin: 0 auto;
    padding: 2rem 2rem 3rem;
    gap: 2.5rem;
    align-items: flex-start;
}

/* ===== TOC SIDEBAR ===== */
.learn-article-toc {
    width: 200px;
    flex-shrink: 0;
    position: sticky;
    top: 100px;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    padding-top: 0.25rem;
}

.learn-toc-header {
    margin-bottom: 1rem;
}

.learn-toc-title {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--learn-gray-600);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin: 0;
    font-family: 'Stack Sans Headline', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

.learn-toc-item {
    margin-bottom: 0.5rem;
}

.learn-toc-link {
    display: block;
    font-size: 0.8125rem;
    color: var(--learn-gray-600);
    text-decoration: none;
    padding: 0.375rem 0;
    padding-left: 0.75rem;
    border-left: 2px solid transparent;
    transition: all 0.2s ease;
}

.learn-toc-link:hover {
    color: var(--learn-black);
    border-left-color: var(--learn-gray-200);
}

.learn-toc-link.active {
    color: var(--learn-black);
    font-weight: 500;
    border-left-color: var(--learn-lime);
}

/* ===== MAIN CONTENT ===== */
.learn-article-main {
    flex: 1;
    min-width: 0;
    max-width: 750px;
    padding-top: 0;
}

/* ===== SUMMARY PARAGRAPH ===== */
.learn-article-summary {
    font-size: 1.125rem;
    color: var(--learn-gray-700);
    line-height: 1.7;
    margin: 0 0 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--learn-gray-200);
}

/* ===== CONTENT SECTIONS ===== */
.learn-section {
    margin-bottom: 2.25rem;
}

.learn-section:first-of-type {
    margin-top: 0;
}

.learn-section__title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--learn-black);
    margin: 0 0 1rem;
    line-height: 1.25;
    font-family: 'Stack Sans Headline', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* ===== BLOCK: PARAGRAPH ===== */
.learn-block-paragraph {
    font-size: 1rem;
    color: var(--learn-gray-700);
    line-height: 1.7;
    margin: 0 0 1rem;
}

.learn-block-paragraph:last-child {
    margin-bottom: 0;
}

.learn-block-paragraph strong {
    color: var(--learn-black);
    font-weight: 600;
}

.learn-block-paragraph a {
    color: var(--learn-black);
    text-decoration: underline;
    text-underline-offset: 2px;
    transition: color 0.2s ease;
}

.learn-block-paragraph a:hover {
    color: var(--learn-gray-600);
}

/* ===== BLOCK: HEADINGS ===== */
.learn-block-h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--learn-black);
    margin: 1.75rem 0 0.75rem;
    line-height: 1.3;
    font-family: 'Stack Sans Headline', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.learn-block-h4 {
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--learn-black);
    margin: 1.5rem 0 0.625rem;
    line-height: 1.35;
    font-family: 'Stack Sans Headline', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* ===== BLOCK: LIST ===== */
.learn-block-list {
    margin: 0 0 1.25rem;
    padding-left: 1.5rem;
}

.learn-block-list li {
    font-size: 1rem;
    color: var(--learn-gray-700);
    line-height: 1.7;
    margin-bottom: 0.5rem;
}

.learn-block-list li:last-child {
    margin-bottom: 0;
}

.learn-block-list li strong {
    color: var(--learn-black);
    font-weight: 600;
}

ul.learn-block-list {
    list-style: disc;
}

ol.learn-block-list {
    list-style: decimal;
}

/* ===== BLOCK: TABLE ===== */
.learn-block-table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 0 0 1.25rem;
    border: 1px solid var(--learn-gray-200);
    border-radius: 0.5rem;
}

.learn-block-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
    min-width: 480px;
}

.learn-block-table thead {
    background: var(--learn-gray-50);
}

.learn-block-table th {
    text-align: left;
    font-weight: 600;
    color: var(--learn-black);
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--learn-gray-200);
    font-family: 'Stack Sans Headline', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    white-space: nowrap;
}

.learn-block-table td {
    padding: 0.75rem 1rem;
    color: var(--learn-gray-700);
    border-bottom: 1px solid var(--learn-gray-100);
    line-height: 1.5;
}

.learn-block-table tbody tr:last-child td {
    border-bottom: none;
}

.learn-block-table tbody tr:hover {
    background: var(--learn-gray-50);
}

/* ===== BLOCK: BLOCKQUOTE ===== */
.learn-block-blockquote {
    margin: 0 0 1.25rem;
    padding: 1rem 1.25rem;
    border-left: 3px solid var(--learn-lime);
    background: var(--learn-gray-50);
    border-radius: 0 0.5rem 0.5rem 0;
}

.learn-block-blockquote p {
    font-size: 1rem;
    color: var(--learn-gray-700);
    line-height: 1.7;
    margin: 0;
    font-style: italic;
}

.learn-block-blockquote cite,
.learn-block-blockquote footer {
    display: block;
    font-size: 0.8125rem;
    color: var(--learn-gray-600);
    margin-top: 0.5rem;
    font-style: normal;
}

/* ===== BLOCK: STEPS ===== */
.learn-block-steps {
    margin: 0 0 1.25rem;
}

.learn-step {
    display: flex;
    gap: 0.875rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--learn-gray-200);
}

.learn-step:first-child {
    padding-top: 0;
}

.learn-step:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.learn-step__number {
    width: 32px;
    height: 32px;
    background: var(--learn-black);
    color: var(--learn-lime);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
    font-family: 'Stack Sans Headline', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.learn-step__content {
    padding-top: 0.25rem;
}

.learn-step__title {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--learn-black);
    margin: 0 0 0.25rem;
    font-family: 'Stack Sans Headline', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.learn-step__description {
    font-size: 0.875rem;
    color: var(--learn-gray-600);
    line-height: 1.5;
    margin: 0;
}

/* ===== BLOCK: CALLOUT ===== */
.learn-block-callout {
    display: flex;
    gap: 0.75rem;
    background: var(--learn-gray-50);
    border: 1px solid var(--learn-gray-200);
    border-left: 3px solid var(--learn-lime);
    border-radius: 0.5rem;
    padding: 1rem 1.25rem;
    margin: 0 0 1.25rem;
}

.learn-block-callout--tip {
    border-left-color: var(--learn-lime);
}

.learn-block-callout--warning {
    border-left-color: #f59e0b;
}

.learn-block-callout--info {
    border-left-color: #3b82f6;
}

.learn-callout__icon {
    font-size: 1.25rem;
    flex-shrink: 0;
    line-height: 1.4;
}

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

.learn-callout__title {
    color: var(--learn-black);
    font-weight: 600;
    display: block;
    margin-bottom: 0.25rem;
    font-size: 0.9375rem;
}

.learn-callout__text {
    font-size: 0.9375rem;
    color: var(--learn-gray-700);
    line-height: 1.6;
    margin: 0;
}

/* ===== FAQ SECTION (Accordion) ===== */
.learn-faq-section {
    padding: 2.5rem 0;
    background: var(--learn-gray-50);
}

.learn-faq__container {
    max-width: 720px;
    margin: 0 auto;
    padding: 0 2rem;
}

.learn-faq__title {
    font-size: clamp(1.375rem, 4vw, 1.75rem);
    font-weight: 700;
    color: var(--learn-black);
    text-align: center;
    margin: 0 0 2rem;
    font-family: 'Stack Sans Headline', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.learn-faq-list {
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}

.learn-faq-item {
    background: var(--learn-white);
    border: 1px solid var(--learn-gray-200);
    border-radius: 0.5rem;
    overflow: hidden;
    transition: border-color 0.2s ease;
}

.learn-faq-item:hover,
.learn-faq-item[open] {
    border-color: var(--learn-lime);
}

.learn-faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--learn-black);
    cursor: pointer;
    list-style: none;
    font-family: 'Stack Sans Headline', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.learn-faq-question::-webkit-details-marker {
    display: none;
}

.learn-faq-question .learn-faq-icon {
    font-size: 1.25rem;
    color: var(--learn-gray-600);
    transition: transform 0.2s ease;
}

.learn-faq-item[open] .learn-faq-question .learn-faq-icon {
    transform: rotate(45deg);
    color: var(--learn-lime);
}

.learn-faq-answer {
    padding: 0 1.25rem 1.25rem;
}

.learn-faq-answer p {
    font-size: 0.875rem;
    line-height: 1.65;
    color: var(--learn-gray-600);
    margin: 0;
}

/* ===== ARTICLE NAVIGATION (Prev/Next) ===== */
.learn-article-navigation {
    background: var(--learn-gray-50);
    padding: 1.5rem 0;
}

.learn-article-navigation__container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    gap: 1rem;
}

.learn-nav-prev,
.learn-nav-next {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding: 1rem 1.25rem;
    background: var(--learn-white);
    border: 1px solid var(--learn-gray-200);
    border-radius: 0.5rem;
    text-decoration: none;
    transition: border-color 0.2s ease;
    flex: 1;
    max-width: 45%;
}

.learn-nav-prev:hover,
.learn-nav-next:hover {
    border-color: var(--learn-lime);
}

.learn-nav-next {
    text-align: right;
}

.learn-nav-label {
    font-size: 0.75rem;
    color: var(--learn-gray-600);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.learn-nav-title {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--learn-black);
    font-family: 'Stack Sans Headline', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.learn-nav-placeholder {
    flex: 1;
    max-width: 45%;
}

/* ===== MOBILE TOC (shown on tablet/mobile, hidden on desktop) ===== */
.learn-article-toc-mobile {
    display: none;
    background: var(--learn-gray-50);
    border: 1px solid var(--learn-gray-200);
    border-radius: 0.5rem;
    margin-bottom: 1.5rem;
    overflow: hidden;
}

.learn-article-toc-mobile summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--learn-black);
    cursor: pointer;
    list-style: none;
    font-family: 'Stack Sans Headline', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.learn-article-toc-mobile summary::-webkit-details-marker {
    display: none;
}

.learn-article-toc-mobile .learn-toc-list {
    padding: 0 1rem 0.75rem;
}

.learn-article-toc-mobile .learn-toc-link {
    padding: 0.3rem 0;
    padding-left: 0.75rem;
}

/* ===== RESPONSIVE: 1024px ===== */
@media (max-width: 1024px) {
    .learn-article-toc {
        display: none;
    }

    .learn-article-toc-mobile {
        display: block;
    }

    .learn-article-layout {
        padding: 1.5rem;
    }

    .learn-article-main {
        max-width: 100%;
    }
}

/* ===== RESPONSIVE: 768px ===== */
@media (max-width: 768px) {
    .learn-article-hero {
        padding: 7rem 0 1.5rem;
    }

    .learn-article-hero__container {
        padding: 0 2rem;
    }

    .learn-article-hero__badge {
        font-size: 0.6875rem;
        padding: 0.3rem 0.625rem;
    }

    .learn-article-hero__title {
        font-size: 1.375rem;
    }

    .learn-article-hero__meta {
        font-size: 0.75rem;
        margin-bottom: 1rem;
    }

    .learn-breadcrumb {
        font-size: 0.75rem;
        margin-bottom: 1rem;
    }

    .learn-article-video {
        padding: 0 2rem;
        margin-bottom: 1.5rem;
    }

    .learn-article-layout {
        padding: 1.25rem 1rem;
    }

    .learn-article-summary {
        font-size: 1rem;
        margin-bottom: 1.5rem;
        padding-bottom: 1rem;
    }

    .learn-section {
        margin-bottom: 1.75rem;
    }

    .learn-section__title {
        font-size: 1.125rem;
        margin-bottom: 0.75rem;
    }

    .learn-block-paragraph {
        font-size: 0.875rem;
        margin-bottom: 0.75rem;
    }

    .learn-block-h3 {
        font-size: 1.0625rem;
        margin: 1.5rem 0 0.625rem;
    }

    .learn-block-h4 {
        font-size: 0.9375rem;
        margin: 1.25rem 0 0.5rem;
    }

    .learn-block-list li {
        font-size: 0.875rem;
    }

    .learn-block-table {
        font-size: 0.8125rem;
    }

    .learn-block-table th,
    .learn-block-table td {
        padding: 0.625rem 0.75rem;
    }

    .learn-block-blockquote {
        padding: 0.875rem 1rem;
    }

    .learn-block-blockquote p {
        font-size: 0.875rem;
    }

    .learn-step {
        padding: 0.75rem 0;
    }

    .learn-step__number {
        width: 28px;
        height: 28px;
        font-size: 0.6875rem;
    }

    .learn-step__title {
        font-size: 0.875rem;
    }

    .learn-step__description {
        font-size: 0.8125rem;
    }

    .learn-block-callout {
        padding: 0.875rem 1rem;
    }

    .learn-callout__title {
        font-size: 0.875rem;
    }

    .learn-callout__text {
        font-size: 0.8125rem;
    }

    .learn-faq-section {
        padding: 1.5rem 0;
    }

    .learn-faq__container {
        padding: 0 1rem;
    }

    .learn-faq__title {
        font-size: 1.125rem;
        margin-bottom: 1rem;
    }

    .learn-faq-question {
        padding: 0.75rem 1rem;
        font-size: 0.8125rem;
    }

    .learn-faq-answer {
        padding: 0 1rem 1rem;
    }

    .learn-faq-answer p {
        font-size: 0.8125rem;
    }

    .learn-article-navigation {
        padding: 1.25rem 0;
    }

    .learn-article-navigation__container {
        flex-direction: column;
        gap: 0.5rem;
        padding: 0 1rem;
    }

    .learn-nav-prev,
    .learn-nav-next {
        max-width: 100%;
        padding: 0.875rem 1rem;
    }

    .learn-nav-next {
        text-align: left;
    }

    .learn-nav-label {
        font-size: 0.6875rem;
    }

    .learn-nav-title {
        font-size: 0.875rem;
    }
}

/* ===== RESPONSIVE: 480px ===== */
@media (max-width: 480px) {
    .learn-article-hero {
        padding: 6.5rem 0 1.25rem;
    }

    .learn-article-hero__container {
        padding: 0 1.5rem;
    }

    .learn-article-hero__badge {
        font-size: 0.625rem;
        padding: 0.25rem 0.5rem;
    }

    .learn-article-hero__title {
        font-size: 1.25rem;
    }

    .learn-article-video {
        padding: 0 1.5rem;
    }

    .learn-article-layout {
        padding: 1rem 0.875rem;
    }

    .learn-article-summary {
        font-size: 0.9375rem;
    }

    .learn-section {
        margin-bottom: 1.5rem;
    }

    .learn-section__title {
        font-size: 1rem;
    }

    .learn-block-paragraph {
        font-size: 0.8125rem;
    }

    .learn-block-h3 {
        font-size: 1rem;
    }

    .learn-block-h4 {
        font-size: 0.9375rem;
    }

    .learn-block-list li {
        font-size: 0.8125rem;
    }

    .learn-block-blockquote {
        padding: 0.75rem 0.875rem;
    }

    .learn-step {
        gap: 0.625rem;
    }

    .learn-step__number {
        width: 26px;
        height: 26px;
        font-size: 0.625rem;
    }

    .learn-step__content {
        padding-top: 0;
    }

    .learn-step__title {
        font-size: 0.8125rem;
    }

    .learn-step__description {
        font-size: 0.75rem;
    }

    .learn-block-callout {
        padding: 0.75rem 0.875rem;
    }

    .learn-faq__title {
        font-size: 1rem;
    }

    .learn-faq-list {
        gap: 0.5rem;
    }

    .learn-faq-question {
        padding: 0.625rem 0.875rem;
        font-size: 0.75rem;
    }

    .learn-faq-answer {
        padding: 0 0.875rem 0.875rem;
    }

    .learn-faq-answer p {
        font-size: 0.75rem;
    }

    .learn-article-navigation__container {
        gap: 0.375rem;
    }

    .learn-nav-prev,
    .learn-nav-next {
        padding: 0.75rem 0.875rem;
    }
}

/* ===== RESPONSIVE: 360px ===== */
@media (max-width: 360px) {
    .learn-article-hero__container {
        padding: 0 1.25rem;
    }

    .learn-article-video {
        padding: 0 1.25rem;
    }
}