/* ==========================================================================
   Article Landing Page Styles — Roadmap.sh + Vercel Docs + GeeksforGeeks Aesthetic
   ========================================================================== */

/* Reading Progress Bar */
.reading-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: var(--grad-primary);
  z-index: 1000;
  transition: width 0.1s linear;
}

/* Documentation Header */
.doc-header {
  position: sticky;
  top: 0;
  z-index: 150;
  background: var(--bg-glass-heavy);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 0;
}

.doc-header-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.doc-hub-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-full);
  background: rgba(217, 119, 6, 0.12);
  border: 1px solid rgba(217, 119, 6, 0.25);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-primary);
}

.doc-header-right {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

/* Breadcrumbs */
.breadcrumb-container {
  padding: 1.25rem 0 0.5rem;
  background: transparent;
}

.doc-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

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

.breadcrumb-list a:hover {
  color: var(--accent-primary);
}

.breadcrumb-sep {
  font-size: 0.65rem;
  opacity: 0.6;
}

.breadcrumb-list li.active {
  color: var(--accent-primary);
  font-weight: 600;
}

/* Layout Grid */
.doc-layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 840px);
  gap: 3.5rem;
  padding-top: 1.5rem;
  padding-bottom: 5rem;
  align-items: start;
}

/* Desktop Sticky Table of Contents */
.desktop-toc-aside {
  position: sticky;
  top: 5rem;
  max-height: calc(100vh - 6rem);
  overflow-y: auto;
}

.toc-sticky-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.5rem 1.25rem;
  backdrop-filter: blur(12px);
}

.toc-heading {
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.toc-nav {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.toc-link {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.45rem 0.65rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.2s ease;
  line-height: 1.4;
}

.toc-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-muted);
  opacity: 0.4;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.toc-link:hover {
  color: var(--accent-primary);
  background: rgba(217, 119, 6, 0.08);
}

.toc-link.active {
  color: var(--accent-primary);
  background: rgba(217, 119, 6, 0.12);
  font-weight: 700;
}

.toc-link.active .toc-dot {
  background: var(--accent-primary);
  opacity: 1;
  transform: scale(1.4);
}

.toc-cta-box {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.toc-cta-icon {
  font-size: 1.5rem;
  color: var(--accent-primary);
  margin-bottom: 0.35rem;
}

.toc-cta-box strong {
  display: block;
  font-size: 0.9rem;
  color: var(--text-primary);
}

.toc-cta-box p {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin: 0.25rem 0 0.85rem;
  line-height: 1.4;
}

/* Mobile TOC */
.mobile-toc-bar {
  display: none;
  padding: 0.75rem 1.5rem;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 3.8rem;
  z-index: 90;
}

.mobile-toc-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: none;
  border: none;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
}

.mobile-toc-dropdown {
  margin-top: 0.85rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--border-color);
}

/* Main Content Area */
.doc-main-content {
  min-width: 0;
}

/* Hero Section */
.doc-hero-section {
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
}

.meta-badges-row {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.meta-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: rgba(68, 51, 34, 0.05);
  border: 1px solid var(--border-color);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
}

[data-theme="dark"] .meta-badge {
  background: rgba(255, 255, 255, 0.05);
}

.badge-gold {
  background: rgba(217, 119, 6, 0.12);
  border-color: rgba(217, 119, 6, 0.3);
  color: var(--accent-primary);
}

.doc-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  font-weight: 900;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.title-sub {
  color: var(--accent-primary);
  display: inline-block;
}

.doc-lead {
  font-size: 1.1rem;
  line-height: 1.65;
  color: var(--text-secondary);
  margin-bottom: 1.75rem;
}

/* Company Badges Strip */
.company-target-strip {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.company-label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.company-badges {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.c-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  background: rgba(68, 51, 34, 0.06);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

[data-theme="dark"] .c-badge {
  background: rgba(255, 255, 255, 0.05);
}

.hero-actions-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Trust Strip */
.trust-stat-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 3rem;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.25rem 1rem;
  text-align: center;
  backdrop-filter: blur(12px);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.stat-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-focus);
}

.stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--accent-primary);
  line-height: 1.2;
}

.stat-lbl {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
}

/* Quick Definition Box */
.quick-def-box {
  background: linear-gradient(135deg, rgba(217, 119, 6, 0.08), rgba(245, 158, 11, 0.04));
  border: 1px solid rgba(217, 119, 6, 0.25);
  border-radius: 16px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 3.5rem;
}

.def-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
  margin-bottom: 0.45rem;
  color: var(--text-primary);
}

.quick-def-box p {
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--text-secondary);
  margin: 0;
}

/* Section Title Wrap */
.section-title-wrap {
  margin-bottom: 2rem;
}

.sec-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-primary);
  margin-bottom: 0.35rem;
}

.section-title-wrap h2 {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-primary);
}

/* Question Cards */
.question-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  margin-bottom: 2rem;
  backdrop-filter: blur(12px);
  transition: border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
}

.question-card:hover {
  border-color: rgba(217, 119, 6, 0.4);
  box-shadow: 0 8px 30px rgba(68, 51, 34, 0.06);
}

[data-theme="dark"] .question-card:hover {
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.q-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.q-number {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-primary);
  background: rgba(217, 119, 6, 0.12);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
}

.freq-tag {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
}

.freq-tag.high {
  background: rgba(16, 185, 129, 0.12);
  color: #10b981;
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.freq-tag.medium {
  background: rgba(245, 158, 11, 0.12);
  color: #d97706;
  border: 1px solid rgba(245, 158, 11, 0.25);
}

.q-title {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
  line-height: 1.4;
}

.q-answer p {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.styled-list {
  padding-left: 1.25rem;
  margin-bottom: 1.25rem;
  color: var(--text-secondary);
  font-size: 0.93rem;
  line-height: 1.7;
}

.styled-list li {
  margin-bottom: 0.5rem;
}

/* Callout Boxes */
.tip-box {
  display: flex;
  gap: 0.85rem;
  background: rgba(13, 148, 136, 0.08);
  border-left: 4px solid #0d9488;
  border-radius: 0 12px 12px 0;
  padding: 1rem 1.25rem;
  margin: 1.25rem 0;
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--text-primary);
}

.tip-icon {
  font-size: 1.2rem;
  color: #0d9488;
  flex-shrink: 0;
  margin-top: 0.15rem;
}

.mistake-box {
  display: flex;
  gap: 0.85rem;
  background: rgba(234, 88, 12, 0.08);
  border-left: 4px solid #ea580c;
  border-radius: 0 12px 12px 0;
  padding: 1rem 1.25rem;
  margin: 1.25rem 0;
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--text-primary);
}

.mistake-icon {
  font-size: 1.2rem;
  color: #ea580c;
  flex-shrink: 0;
  margin-top: 0.15rem;
}

.follow-up-box {
  background: rgba(68, 51, 34, 0.03);
  border: 1px dashed var(--border-color);
  border-radius: 12px;
  padding: 0.85rem 1.25rem;
  margin-top: 1.25rem;
  font-size: 0.85rem;
}

.follow-up-title {
  display: block;
  font-weight: 700;
  color: var(--accent-primary);
  margin-bottom: 0.25rem;
}

.follow-up-box p {
  margin: 0;
  color: var(--text-secondary);
}

/* Documentation Tables */
.table-wrapper {
  overflow-x: auto;
  margin: 1.25rem 0;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.doc-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  text-align: left;
}

.doc-table th {
  background: rgba(68, 51, 34, 0.05);
  padding: 0.75rem 1rem;
  font-weight: 700;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
}

[data-theme="dark"] .doc-table th {
  background: rgba(255, 255, 255, 0.05);
}

.doc-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.doc-table tbody tr:nth-child(even) {
  background: rgba(68, 51, 34, 0.02);
}

[data-theme="dark"] .doc-table tbody tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.02);
}

.doc-table code {
  font-family: var(--font-mono);
  background: rgba(217, 119, 6, 0.1);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.82rem;
  color: var(--accent-primary);
}

/* Code Blocks */
.code-box {
  background: #0d0e12;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  overflow: hidden;
  margin: 1.25rem 0;
}

.code-box-header {
  background: rgba(255, 255, 255, 0.04);
  padding: 0.5rem 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: #a8a29e;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.code-box pre {
  padding: 1rem;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: #f5f5f4;
  line-height: 1.5;
  overflow-x: auto;
}

/* Flashcard Grid */
.flashcard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.flashcard {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.25rem;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  position: relative;
  overflow: hidden;
}

.flashcard:hover {
  transform: translateY(-3px);
  border-color: var(--border-focus);
  box-shadow: var(--shadow-md);
}

.fc-number {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-primary);
  background: rgba(217, 119, 6, 0.12);
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 0.5rem;
}

.fc-question {
  display: block;
  font-size: 0.95rem;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.fc-answer {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0;
}

/* FAQ Accordion */
.doc-faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-top: 1.5rem;
}

.faq-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.faq-card.active {
  border-color: var(--border-focus);
}

.faq-header {
  width: 100%;
  padding: 1.25rem 1.5rem;
  background: none;
  border: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
}

.faq-chevron {
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: transform 0.25s ease;
}

.faq-card.active .faq-chevron {
  transform: rotate(180deg);
  color: var(--accent-primary);
}

.faq-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  padding: 0 1.5rem;
}

.faq-card.active .faq-content {
  max-height: 250px;
  padding-bottom: 1.25rem;
}

.faq-content p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

/* Related Resources */
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.related-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  text-decoration: none;
  transition: all 0.2s ease;
}

.related-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-focus);
  background: rgba(217, 119, 6, 0.04);
}

.related-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(217, 119, 6, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.related-content h4 {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}

.related-content p {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.4;
}

.related-arrow {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-left: auto;
  transition: transform 0.2s ease;
}

.related-card:hover .related-arrow {
  transform: translateX(4px);
  color: var(--accent-primary);
}

/* Footer CTA */
.doc-footer-cta {
  margin: 4.5rem 0 2rem;
  background: linear-gradient(135deg, rgba(217, 119, 6, 0.12), rgba(180, 83, 9, 0.08));
  border: 1px solid rgba(217, 119, 6, 0.3);
  border-radius: 24px;
  padding: 3rem 2rem;
  text-align: center;
}

.cta-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--accent-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.doc-footer-cta h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.3rem);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.doc-footer-cta p {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 580px;
  margin: 0 auto 2rem;
  line-height: 1.6;
}

.doc-cta-btn-group {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.doc-page-footer {
  margin-top: 2rem;
}

/* Responsive Media Queries */
@media (max-width: 960px) {
  .doc-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .desktop-toc-aside {
    display: none;
  }
  .mobile-toc-bar {
    display: block;
  }
  .trust-stat-strip {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .trust-stat-strip {
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
  }
  .question-card {
    padding: 1.25rem;
  }
  .hero-actions-row .btn {
    width: 100%;
  }
  .doc-cta-btn-group .btn {
    width: 100%;
  }
}