/**
 * ============================================================================
 * CRAFTEGON CORPORATE SERVICES (CCS) - KNOWLEDGE ARTICLE NAVIGATION STYLES
 * Sticky Table of Contents, Reading Progress Bar & Floating Back-to-Top Button
 * ============================================================================
 */

/* Reading Progress Bar (Top of Screen) */
#reading-progress-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3.5px;
  background: transparent;
  z-index: 1000;
  pointer-events: none;
}

#reading-progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-mint-vibrant, #75CDA9) 0%, var(--accent-green-primary, #247A62) 100%);
  transition: width 0.1s ease-out;
}

/* Sticky Table of Contents Sidebar / Dock */
.article-nav-wrapper {
  position: relative;
  display: block;
}

@media (min-width: 1200px) {
  .article-with-toc {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 3.5rem;
    align-items: start;
    max-width: 1200px !important;
    margin: 0 auto;
  }
}

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

.article-sidebar-col {
  min-width: 0;
}

@media (max-width: 1199px) {
  .article-with-toc {
    display: flex;
    flex-direction: column;
  }
  .article-sidebar-col {
    margin-top: 2rem;
    order: 2;
  }
  .article-main-col {
    order: 1;
  }
}

.toc-item-sub {
  padding-left: 0.85rem;
}

.toc-item-sub .toc-link {
  font-size: 0.78rem;
  color: var(--text-muted, #728F99);
}

.sticky-toc-container {
  background: #FFFFFF;
  border: 1px solid var(--border-color, #DCE8E5);
  border-radius: 12px;
  padding: 1.5rem 1.25rem;
  box-shadow: 0 4px 16px rgba(16, 38, 46, 0.05);
  margin-bottom: 2rem;
}

@media (min-width: 1200px) {
  .sticky-toc-container {
    position: sticky;
    top: 90px;
    margin-bottom: 0;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
  }
}

.toc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--border-color, #DCE8E5);
}

.toc-title {
  font-family: var(--font-heading, 'Manrope', sans-serif);
  font-size: 0.88rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--navy-900, #10262E);
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.toc-badge {
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--accent-green-primary, #247A62);
  background: var(--surface-mint-soft, #DDF5EA);
  padding: 2px 7px;
  border-radius: 999px;
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.toc-item {
  position: relative;
}

.toc-link {
  display: block;
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: 0.82rem;
  line-height: 1.45;
  color: var(--text-secondary, #52717A);
  text-decoration: none;
  padding: 0.35rem 0.6rem;
  border-radius: 6px;
  border-left: 2px solid transparent;
  transition: all 0.2s ease;
}

.toc-link:hover {
  color: var(--accent-green-primary, #247A62);
  background: var(--surface-mint-white, #F4FAF7);
}

.toc-link.active {
  color: var(--navy-900, #10262E);
  font-weight: 700;
  background: var(--surface-mint-soft, #DDF5EA);
  border-left-color: var(--accent-green-primary, #247A62);
}

/* Floating Back-to-Top Button */
#back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 5.5rem; /* Sits next to chat widget */
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #FFFFFF;
  border: 1.5px solid var(--accent-mint-vibrant, #75CDA9);
  color: var(--accent-green-primary, #247A62);
  box-shadow: 0 4px 16px rgba(16, 38, 46, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 990;
}

#back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

#back-to-top:hover {
  background: var(--accent-green-primary, #247A62);
  color: #FFFFFF;
  border-color: var(--accent-green-primary, #247A62);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(36, 122, 98, 0.3);
}

#back-to-top svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  stroke-width: 2.2;
}

@media (max-width: 768px) {
  #back-to-top {
    bottom: 5.5rem;
    right: 1.25rem;
    width: 40px;
    height: 40px;
  }
}

/* Fluid Typography and Symmetrical Balance for Article Headers */
article h1,
.article-main-col h1 {
  font-family: var(--font-heading, 'Manrope', sans-serif) !important;
  font-size: clamp(1.75rem, 4.2vw, 2.5rem) !important;
  font-weight: 800 !important;
  color: var(--navy-900, #10262E) !important;
  line-height: 1.25 !important;
  letter-spacing: -0.02em !important;
  text-wrap: balance !important;
  word-break: break-word !important;
  margin-bottom: 1rem !important;
}