/* ========================================
   YOYAGE Technical Article Page Styles
   (/technical-articles/<slug>/)
   Purpose: shared template for every technical
            article — text hero, reading column,
            sticky TOC, tables, key takeaways,
            FAQ, author box, related resources
   Dependencies: base.css / layout.css /
            components.css (loaded before)
   ======================================== */

/* ---------- 1. Article Hero ---------- */
.article-hero {
  padding-top: 48px;
  padding-bottom: 44px;
  background: linear-gradient(120deg, var(--color-brand-dark) 0%, var(--color-brand) 100%);
}

.article-hero .breadcrumb {
  justify-content: center;
  margin-bottom: 20px;
}

.article-hero .breadcrumb a {
  color: rgba(255, 255, 255, 0.75);
}

.article-hero .breadcrumb a:hover {
  color: var(--color-white);
}

.article-hero .breadcrumb-separator {
  color: rgba(255, 255, 255, 0.4);
}

.article-hero .breadcrumb-current {
  color: var(--color-white);
}

.article-title {
  max-width: 900px;
  margin: 0 auto;
  font-size: 46px;
  line-height: 1.2;
  letter-spacing: -0.01em;
  text-align: center;
  color: var(--color-white);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 12px 14px;
  margin-top: 24px;
  font-size: var(--fs-small);
  color: rgba(255, 255, 255, 0.92);
}

.article-meta li {
  display: flex;
  align-items: center;
  gap: 6px;
}

.article-meta li + li::before {
  content: "";
  width: 3px;
  height: 3px;
  margin-right: 6px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.38);
}

.article-meta-icon {
  flex-shrink: 0;
  width: 15px;
  height: 15px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.4;
  stroke-linecap: round;
  stroke-linejoin: round;
  color: rgba(255, 255, 255, 0.72);
}

.article-meta-tag {
  padding: 5px 12px;
  border: 1px solid rgba(255, 255, 255, 0.32);
  border-radius: 999px;
  background-color: rgba(255, 255, 255, 0.12);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-white);
}

.article-meta-author {
  color: rgba(255, 255, 255, 0.85);
}

.article-meta strong {
  font-weight: 600;
  color: var(--color-white);
}

/* ---------- 2. Layout ---------- */
.article-section {
  padding-top: 56px;
  padding-bottom: 80px;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 48px;
  max-width: 1120px;
  margin: 0 auto;
}

.article-main {
  min-width: 0;
}

/* ---------- 3. Key Takeaways ---------- */
.key-takeaways {
  margin-bottom: 40px;
  padding: 24px 26px;
  background-color: var(--color-bg-alt);
  border-left: 3px solid var(--color-brand);
  border-radius: var(--radius-card);
}

.key-takeaways-title {
  margin-bottom: 12px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-title);
}

.key-takeaways li {
  position: relative;
  padding-left: 18px;
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--color-text);
}

.key-takeaways li + li {
  margin-top: 8px;
}

.key-takeaways li::before {
  content: "";
  position: absolute;
  top: 11px;
  left: 0;
  width: 8px;
  height: 2px;
  background-color: var(--color-brand);
}

/* ---------- 4. Article Body ---------- */
.article-body {
  font-size: 17px;
  line-height: 1.8;
  color: var(--color-text);
}

.article-body p {
  margin-bottom: 20px;
}

.article-body h2 {
  margin-top: 56px;
  margin-bottom: 16px;
  font-size: 30px;
  line-height: 1.3;
  scroll-margin-top: calc(96px + var(--expo-bar-h));
}

.article-body h3 {
  margin-top: 32px;
  margin-bottom: 12px;
  font-size: 21px;
  line-height: 1.35;
  color: var(--color-title);
}

.article-body ul,
.article-body ol {
  margin-bottom: 22px;
  padding-left: 1.3em;
  list-style: disc;
}

.article-body ol {
  list-style: decimal;
}

.article-body li {
  margin-bottom: 8px;
}

.article-body li::marker {
  color: var(--color-brand);
  font-weight: 600;
}

.article-body li strong {
  color: var(--color-title);
}

.article-body a:not(.btn) {
  color: var(--color-brand);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-body a:not(.btn):hover {
  color: var(--color-brand-dark);
}

.article-formula {
  margin: 4px 0 24px;
  padding: 18px 20px;
  background-color: var(--color-bg-alt);
  border-radius: var(--radius-card);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-align: center;
  color: var(--color-title);
}

.article-note {
  margin-bottom: 22px;
  font-size: var(--fs-small);
  line-height: 1.7;
  color: var(--color-text-muted);
}

/* ---------- 5. Tables ---------- */
.article-table-wrap {
  margin: 24px 0 12px;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
}

.article-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: 14.5px;
  line-height: 1.5;
}

.article-table caption {
  caption-side: top;
  padding: 14px 16px;
  font-size: var(--fs-small);
  font-weight: 600;
  text-align: left;
  color: var(--color-title);
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.article-table th,
.article-table td {
  padding: 10px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--color-border);
}

.article-table thead th {
  font-weight: 600;
  white-space: nowrap;
  color: var(--color-title);
  background-color: var(--color-tag-bg);
}

.article-table tbody th {
  font-weight: 600;
  color: var(--color-title);
}

.article-table tbody tr:last-child th,
.article-table tbody tr:last-child td {
  border-bottom: none;
}

/* ---------- 6. Figure ---------- */
.article-figure {
  margin: 28px 0 24px;
}

.article-figure img {
  max-width: 620px;
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
}

.article-figure--compact img {
  max-width: 400px;
  height: auto;
}

.article-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-text-muted);
}

/* ---------- 7. Inline CTA ---------- */
.article-inline-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin: 40px 0;
  padding: 24px 26px;
  background-color: var(--color-bg-alt);
  border-left: 3px solid var(--color-brand);
  border-radius: var(--radius-card);
}

.article-inline-cta-title {
  margin-bottom: 6px;
  font-size: 18px;
  line-height: 1.4;
  color: var(--color-title);
}

.article-inline-cta-text {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.65;
  color: var(--color-text);
}

/* ---------- 8. FAQ, Standards, Author ---------- */
.article-faq,
.article-standards {
  margin-top: 56px;
}

.article-faq .section-eyebrow,
.article-standards .section-eyebrow {
  display: block;
  margin-bottom: 10px;
}

.article-faq h2,
.article-standards h2 {
  margin-bottom: 20px;
  font-size: 30px;
  line-height: 1.3;
  scroll-margin-top: calc(96px + var(--expo-bar-h));
}

.article-faq .faq-question {
  font-size: 17px;
}

.article-standards ul {
  padding-left: 0;
  list-style: none;
}

.article-standards li {
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 15px;
  line-height: 1.7;
}

.article-standards li:last-child {
  border-bottom: none;
}

.article-standards li strong {
  display: block;
  margin-bottom: 2px;
  font-weight: 600;
  color: var(--color-title);
}

.article-author {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  margin-top: 44px;
  padding: 24px;
  background-color: var(--color-bg-alt);
  border-radius: var(--radius-card);
}

.article-author-avatar {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background-color: var(--color-brand);
  color: var(--color-white);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.article-author-name {
  margin-bottom: 4px;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-title);
}

.article-author-desc {
  font-size: var(--fs-small);
  line-height: 1.65;
}

.article-author-desc a {
  color: var(--color-brand);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 9. Sidebar ---------- */
.article-side {
  position: sticky;
  top: calc(96px + var(--expo-bar-h));
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-height: calc(100vh - 120px - var(--expo-bar-h));
  overflow-y: auto;
  scrollbar-width: thin;
}

.article-toc {
  padding: 20px;
  background-color: var(--color-bg-alt);
  border-radius: var(--radius-card);
}

.article-toc-title {
  margin-bottom: 12px;
  font-size: var(--fs-eyebrow);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-title);
}

.article-toc-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.article-toc-list a {
  display: block;
  padding: 6px 0 6px 12px;
  border-left: 2px solid transparent;
  font-size: var(--fs-small);
  line-height: 1.5;
  color: var(--color-text);
}

.article-toc-list a:hover {
  color: var(--color-brand);
}

.article-toc-list a.is-active {
  border-left-color: var(--color-brand);
  font-weight: 600;
  color: var(--color-brand);
}

.article-cta-card {
  padding: 22px 20px;
  background-color: var(--color-brand);
  border-radius: var(--radius-card);
}

.article-cta-card-title {
  margin-bottom: 8px;
  font-size: 17px;
  line-height: 1.4;
  color: var(--color-white);
}

.article-cta-card-text {
  margin-bottom: 16px;
  font-size: var(--fs-small);
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.85);
}

.article-cta-card .btn {
  width: 100%;
  justify-content: center;
}

.article-cta-card .btn + .btn {
  margin-top: 10px;
}

.article-cta-card .btn-cta-outline {
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.7);
}

.article-cta-card .btn-cta-outline:hover {
  background-color: var(--color-white);
  color: var(--color-brand);
}

/* ---------- 10. Related Resources ---------- */
.article-related {
  padding-bottom: 72px;
}

.article-related-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.article-related-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  transition: border-color var(--transition-fast);
}

.article-related-card:hover {
  border-color: var(--color-brand);
}

.article-related-index {
  flex-shrink: 0;
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  color: var(--color-border);
  user-select: none;
}

.article-related-title {
  display: block;
  margin-bottom: 4px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-title);
}

.article-related-text {
  display: block;
  font-size: var(--fs-small);
  line-height: 1.6;
  color: var(--color-text);
}

/* ---------- 11. Responsive ---------- */
@media (max-width: 991px) {
  .article-title {
    font-size: 38px;
  }

  .article-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .article-side {
    position: static;
    order: -1;
    max-height: none;
    overflow: visible;
  }

  .article-cta-card {
    display: none;
  }

  .article-toc {
    padding: 18px 20px;
  }

  .article-toc-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2px 20px;
  }
}

@media (max-width: 767px) {
  .article-hero {
    padding-top: 32px;
    padding-bottom: 28px;
  }

  .article-title {
    font-size: 30px;
  }

  .article-section {
    padding-top: 32px;
    padding-bottom: 44px;
  }

  .article-body {
    font-size: 16px;
    line-height: 1.7;
  }

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

  .article-body h2 {
    margin-top: 32px;
    margin-bottom: 12px;
    font-size: 24px;
  }

  .article-body h3 {
    margin-top: 24px;
    margin-bottom: 10px;
    font-size: 19px;
  }

  .article-body ul,
  .article-body ol {
    margin-bottom: 18px;
  }

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

  .article-table-wrap {
    margin: 18px 0 10px;
  }

  .article-figure {
    margin: 22px 0 18px;
  }

  .key-takeaways {
    margin-bottom: 32px;
    padding: 18px;
  }

  .article-inline-cta {
    flex-direction: column;
    align-items: flex-start;
    margin: 32px 0;
    padding: 20px;
  }

  .article-faq,
  .article-standards {
    margin-top: 40px;
  }

  .article-faq h2,
  .article-standards h2 {
    margin-bottom: 16px;
    font-size: 24px;
  }

  .article-author {
    margin-top: 32px;
    padding: 20px;
  }

  .article-toc {
    padding: 16px 18px;
  }

  .article-toc-title {
    margin-bottom: 8px;
  }

  .article-toc-list {
    grid-template-columns: 1fr;
  }

  .article-toc-list a {
    padding: 5px 0 5px 10px;
  }

  .article-related {
    padding-bottom: 48px;
  }

  .article-related-grid {
    grid-template-columns: 1fr;
    gap: 16px;
    margin-top: 20px;
  }

  .article-related-card {
    padding: 18px;
  }

  .article-faq .faq-question {
    font-size: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .article-related-card {
    transition: none;
  }
}