/*  styles/lesson.css
    Custom styles for high-end educational content.
    Follows "Clarity · No fluff" design principles.
*/

/*  1. ARTICLE LAYOUT */
.content-wrap {
  display: flex;
  flex-direction: row;
  gap: 3rem;
  /* Reduced from 4rem for better fit on narrow screens */
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
  padding-block: 4rem 3rem;
}

@media (min-width: 1024px) {
  .content-wrap {
    display: grid;
    grid-template-columns: var(--col-aside) 1fr;
    align-items: start;
  }
}

/* TL;DR */

.tldr {
  margin-block: 2rem 0;
  padding: 1.25rem 1.75rem;
  background-color: var(--surface2);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  text-align: left;
}

/* Match .article h2 typography exactly */
.tldr__label {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 400;
  color: var(--text-s);
  margin-top: 0;
  margin-bottom: 0.75rem;
  text-transform: none;
  letter-spacing: normal;
}

.tldr__definition p {
  font-family: var(--font-sans);
  font-size: var(--text-md);
  line-height: 1.6;
  color: var(--text-s);
  margin-bottom: 1rem;
  opacity: 0.95;
}

.tldr__list {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.tldr__list li {
  font-family: var(--font-sans);
  font-size: var(--text-md);
  line-height: 1.6;
  color: var(--text-s);
  opacity: 0.9;
}


.ask-ai {
  background-color: var(--surface2);
  border-bottom: 1px solid var(--border);
  padding-block: 0.4rem;
}

.ask-ai__inner {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.ask-ai__label {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  white-space: nowrap;
  flex-shrink: 0;
}

.ask-ai__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-wrap: wrap;
}

/* Icon-only pill button */
.ask-ai__link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--surface);
  color: var(--muted);
  text-decoration: none;
  transition: border-color var(--t-fast), color var(--t-fast), background-color var(--t-fast);
  flex-shrink: 0;
}

.ask-ai__link svg {
  width: 16px;
  height: 16px;
  display: block;
}

.ask-ai__link:hover,
.ask-ai__link:focus-visible {
  color: var(--text-s);
  border-color: var(--border-h);
  background-color: var(--surface2);
  outline: none;
}

/* SHARE DROPDOWN */

/* Trigger button lives inside .hero__inner — align with article-author */
.share-trigger {
  margin-top: 1rem;
}

.share-wrap {
  position: relative;
  display: inline-block;
}

.share-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  z-index: 200;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  min-width: 185px;
  padding: 0.35rem;
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.share-menu[hidden] {
  display: none;
}

.share-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.55rem 0.75rem;
  border-radius: calc(var(--radius-sm) - 2px);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--text-s);
  text-decoration: none;
  background: transparent;
  border: none;
  cursor: pointer;
  width: 100%;
  text-align: left;
  transition: background-color var(--t-fast);
}

.share-item:hover,
.share-item:focus-visible {
  background-color: var(--surface2);
  outline: none;
}

.share-item svg {
  flex-shrink: 0;
  color: var(--muted);
}

/* Ensure margins on tablet and mobile */
@media (max-width: 1100px) {
  :root {
    --gutter: clamp(1.5rem, 6vw, 2.5rem);
  }

  .content-wrap {
    gap: 2rem;
  }
}

/* Utilities */
.show-mobile {
  display: none;
}

@media (max-width: 1023px) {
  .hide-mobile {
    display: none;
  }

  .show-mobile {
    display: inline-block;
  }

  .toc-sidebar {
    display: none !important;
  }

  .lesson-nav {
    grid-template-columns: 1fr !important;
  }
}

@media (min-width: 1024px) {
  .content-wrap {
    display: grid !important;
    grid-template-columns: var(--col-aside) 1fr;
    align-items: start;
  }
}

.article {
  max-width: var(--col-body);
  font-size: var(--text-base);
  line-height: var(--lh-base, 1.7);
  /* Standardized line-height */
  color: var(--text-s);
  overflow-wrap: break-word;
  word-wrap: break-word;
  word-break: break-word;
  max-width: 100%;
}

.article code {
  font-family: 'Geist Mono', var(--font-mono, monospace);
  font-size: 0.875em;
  background-color: var(--surface2);
  color: var(--text-s);
  overflow-wrap: break-word;
  word-break: break-word;
}

/* Fix oversized section spacing inherited from base.css */
.article .section {
  padding-block: 1rem 0;
  /* Minimal padding between educational sections */
}

/*  2. TABLE OF CONTENTS (SIDEBAR) */
.toc-sidebar {
  position: sticky;
  top: 8rem;
  width: var(--col-aside);
  flex-shrink: 0;
  /* Prevent horizontal compression */
}

.toc-eyebrow {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1rem;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  /* Closer list items */
}

.toc-link {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--muted);
  text-decoration: none;
  transition: color var(--t-fast), padding-left var(--t-fast);
  display: block;
}

.toc-link:hover,
.toc-link.is-active {
  color: var(--text-s);
}

.toc-link.is-active {
  font-weight: 500;
  color: var(--text-s);
  padding-left: 0.5rem;
  border-left: 2px solid var(--accent);
}

.toc-list li.sub {
  padding-left: 1rem;
}

/* Mobile TOC Accordion */
.toc-mobile {
  margin-bottom: 2rem;
  padding: 1rem;
  background: var(--surface2);
  border-radius: var(--radius);
}

@media (min-width: 1024px) {
  .toc-mobile {
    display: none;
  }
}

.toc-accordion summary {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
}


/*  3. TYPOGRAPHY & BLOCKS */
.article p {
  font-family: var(--font-sans);
  font-size: inherit;
  /* Inherit var(--text-base) from .article */
  line-height: inherit;
  color: var(--text-s);
  margin-bottom: 1.25rem;
  opacity: 0.9;
}

.article h2 {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  /* Reduced title size for cleaner look */
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

.article h3 {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  margin-top: 1rem;
  margin-bottom: 0.5rem;
}

.rule {
  border: none;
  border-top: 1px solid var(--border);
  margin-block: 2rem;
}

/*  4. COMPONENTS */

/* Callout */
.callout {
  margin-block: 2.5rem;
  /* Increased spacing for better document flow */
  padding: 1.5rem 2rem;
  background-color: var(--surface2);
  border-left: 3px solid var(--accent);
  /* Slightly thicker accent line */
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.callout-label {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
  color: var(--accent);
}

.callout-p {
  font-style: italic;
  margin-bottom: 0 !important;
}

/* Anatomy Row */
.anatomy {
  margin-block: 2.5rem;
  display: flex;
  flex-direction: column;
}

.anatomy-row {
  display: grid;
  grid-template-columns: 160px 1fr;
  align-items: baseline;
  padding-block: 1rem;
  border-bottom: 1px solid var(--border);
}

@media (max-width: 640px) {
  .ask-ai__inner {
    gap: 0.75rem;
  }

  /* Keep the share menu from overflowing viewport edges on mobile */
  .share-menu {
    left: auto;
    right: 0;
  }
}


.anatomy-row:first-child {
  border-top: 1px solid var(--border);
}

.anatomy-label {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--muted);
}

.anatomy-content {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
}

.anatomy-content .cmt {
  display: block;
  margin-top: 0.25rem;
  color: var(--muted);
  font-style: italic;
}

/* Technique Grid */
/* Technique Tabs */
.technique-tabs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(200px, 100%), 1fr));
  gap: 1rem;
  margin-block: 2rem;
}

.technique-card {
  padding: 1.25rem;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all var(--t-fast);
  text-align: left;
  cursor: pointer;
}

.technique-card:hover {
  border-color: var(--border-h);
  background-color: var(--surface2);
}

.technique-card.is-active {
  border-color: var(--accent);
  background-color: var(--surface2);
  box-shadow: 0 0 0 1px var(--accent);
}

.technique-name {
  font-family: var(--font-serif);
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.technique-desc {
  font-family: var(--font-sans);
  font-size: var(--text-xs) !important;
  color: var(--muted);
  line-height: 1.4 !important;
  margin-bottom: 0 !important;
}

.tech-panel {
  display: none;
  animation: fadeIn 0.4s ease;
}

.tech-panel.is-active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Example Blocks */
.example {
  margin-block: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.example-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 1rem;
  background-color: var(--surface2);
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
}

.example-body {
  padding: 1.25rem 1.5rem;
  margin: 0;
  font-family: 'Geist Mono', var(--font-mono, monospace);
  font-size: var(--text-sm);
  line-height: 1.6;
  white-space: pre;
  background-color: var(--surface);
  color: var(--text-s);
  overflow-x: auto;
  word-break: normal;
  overflow-wrap: normal;
}

/* PrismJS Base */
code[class*="language-"],
pre[class*="language-"] {
  color: var(--text-s);
  background: none;
  font-family: 'Geist Mono', var(--font-mono, monospace);
  font-size: var(--text-sm);
  text-align: left;
  white-space: pre;
  word-spacing: normal;
  word-break: normal;
  word-wrap: normal;
  line-height: 1.6;
  tab-size: 4;
  hyphens: none;
}

/* Tokens */
.token.comment,
.token.prolog,
.token.doctype,
.token.cdata {
  color: var(--muted);
  font-style: italic;
}

.token.punctuation {
  color: var(--muted);
}

.token.namespace {
  opacity: .7;
}

.token.property,
.token.tag,
.token.boolean,
.token.number,
.token.constant,
.token.symbol,
.token.deleted {
  color: #c678dd;
  /* Purple */
}

.token.selector,
.token.attr-name,
.token.string,
.token.char,
.token.builtin,
.token.inserted {
  color: #98c379;
  /* Green */
}

.token.operator,
.token.entity,
.token.url,
.language-css .token.string,
.style .token.string {
  color: var(--text-s);
}

.token.atrule,
.token.attr-value,
.token.keyword {
  color: #61afef;
  /* Blue */
}

.token.function,
.token.class-name {
  color: #e5c07b;
  /* Yellow */
}

.token.regex,
.token.important,
.token.variable {
  color: #e06c75;
  /* Red */
}

/* Line Numbers */
pre[class*="language-"].line-numbers {
  position: relative;
  padding-left: 3.8em;
  counter-reset: linenumber;
}

pre[class*="language-"].line-numbers>code {
  position: relative;
  white-space: inherit;
}

.line-numbers .line-numbers-rows {
  position: absolute;
  pointer-events: none;
  top: 1.25rem;
  font-size: 100%;
  left: -3.8em;
  width: 3em;
  letter-spacing: -1px;
  border-right: 1px solid var(--border);
  user-select: none;
}

.line-numbers-rows>span {
  display: block;
  counter-increment: linenumber;
}

.line-numbers-rows>span:before {
  content: counter(linenumber);
  color: var(--muted-2);
  display: block;
  padding-right: 0.8em;
  text-align: right;
}

/* Dark mode token overrides if necessary */
html.dark .token.property,
html.dark .token.tag,
html.dark .token.boolean,
html.dark .token.number,
html.dark .token.constant,
html.dark .token.symbol,
html.dark .token.deleted {
  color: #d19a66;
  /* Orange */
}

html.dark .token.atrule,
html.dark .token.attr-value,
html.dark .token.keyword {
  color: #c678dd;
  /* Purple */
}


.badge {
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-sm);
  font-size: 0.625rem;
  text-transform: uppercase;
  background: var(--border);
  color: var(--text-s);
}

.badge.good {
  background-color: rgba(30, 142, 62, 0.1);
  color: #1e8e3e;
}

.badge.bad {
  background-color: rgba(217, 48, 37, 0.1);
  color: #d93025;
}

html.dark .badge.good {
  background-color: rgba(129, 201, 149, 0.15);
  color: #81c995;
}

html.dark .badge.bad {
  background-color: rgba(242, 139, 130, 0.15);
  color: #f28b82;
}

/* Data Table */
.data-table-wrap {
  margin-block: 3rem;
  overflow: visible; /* Allow tooltips to overflow */
  max-width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

@media (max-width: 768px) {
  .data-table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}

.data-table-wrap::-webkit-scrollbar {
  height: 6px;
}

.data-table-wrap::-webkit-scrollbar-thumb {
  background: var(--border-h);
  border-radius: var(--radius-xl);
}

.data-table {
  width: 100%;
  min-width: 600px;
  /* Prevent columns from collapsing on mobile */
  border-collapse: collapse;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  table-layout: auto;
}

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

.data-table th {
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background-color: var(--surface2-translucent, rgba(238, 236, 231, 0.8));
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.data-table tr:hover td {
  background-color: var(--surface2);
}

.data-table td {
  transition: background-color var(--t-fast);
}

/*  5. FAQ SECTION */
.article-faq {
  margin-block: 4rem 2rem;
  padding-top: 3rem;
  border-top: 1px solid var(--border);
}

.article-faq h2 {
  margin-top: 0 !important;
  margin-bottom: 2rem !important;
}

.faq-item {
  border-bottom: 1px solid var(--border);
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-accordion {
  padding-block: 1.25rem;
  cursor: pointer;
}

.faq-accordion summary {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--text-s);
  transition: color var(--t-fast);
}

.faq-accordion summary::-webkit-details-marker {
  display: none;
}

.faq-accordion summary:hover {
  color: var(--accent);
}

.faq-icon {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  color: var(--muted);
  transition: transform var(--t-base);
}

.faq-accordion[open] .faq-icon {
  transform: rotate(180deg);
}

.faq-content {
  padding-top: 1rem;
  padding-right: 2rem;
  animation: slideIn 0.3s ease-out;
}

.faq-content p {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--muted);
  margin-bottom: 0 !important;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/*  6. PROGRESS BAR */
.progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: transparent;
  z-index: 200;
}

.progress-fill {
  height: 100%;
  background: var(--accent);
  width: 0%;
}

/*  6. SERIES & NAV FOOTER */
.series-banner {
  position: fixed;
  top: 56px;
  /* Below fixed nav */
  left: 0;
  right: 0;
  z-index: 90;
  background-color: var(--surface2-translucent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding-block: 0.5rem;
  padding-inline: var(--gutter);
}

.series-banner__inner {
  max-width: var(--container);
  margin-inline: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

.series-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
}

.series-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-sep {
  color: var(--border);
  font-size: 0.8rem;
  margin-inline: 0.25rem;
}

.series-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--surface2);
  color: var(--text-s);
  text-decoration: none;
  transition: all var(--t-fast);
  flex-shrink: 0;
  font-weight: 700;
  font-size: 1rem;
}

.series-btn:hover:not(.disabled) {
  border-color: var(--border-h);
  background-color: var(--surface);
}

.series-btn.disabled {
  opacity: 0.35;
  cursor: not-allowed;
  pointer-events: none;
}

.container--narrow {
  max-width: var(--col-body);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.lesson-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 4rem;
}

@media (max-width: 640px) {
  .lesson-nav {
    grid-template-columns: 1fr;
  }
}

.lesson-nav-card {
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: border-color var(--t-fast);
}

.lesson-nav-card>div {
  min-width: 0;
}

.lesson-nav-card:hover:not(.disabled) {
  border-color: var(--border-h);
}

.lesson-nav-card.disabled {
  opacity: 0.35;
  pointer-events: none;
  background: transparent;
}

.lesson-nav-label {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-bottom: 0.25rem;
}

.lesson-nav-title {
  font-family: var(--font-serif);
  font-size: var(--text-base);
  color: var(--text-s);
  margin: 0;
}

.lesson-nav-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--surface2);
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 1rem;
  transition: all var(--t-fast);
  flex-shrink: 0;
}

.lesson-nav-card:hover .lesson-nav-arrow {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--surface);
}

.lesson-nav-card:hover .lesson-nav-arrow.left {
  transform: translateX(-4px);
}

.lesson-nav-card:hover .lesson-nav-arrow.right {
  transform: translateX(4px);
}


/*  7. LESSON HERO */
.hero--lesson {
  background-color: var(--surface2);
  padding-block: 10rem 4rem;
  /* Increased top padding to clear fixed banner + nav */
  border-bottom: 1px solid var(--border);
}

.hero--lesson .hero__inner {
  max-width: var(--col-body);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.crumb {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--muted);
  text-decoration: none;
  margin-bottom: 2rem;
  transition: color var(--t-fast);
}

.crumb:hover {
  color: var(--text-s);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.5rem;
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  color: var(--muted);
  flex-wrap: wrap;
}

.meta-pill {
  padding: 0 0.85rem;
  height: 30px;
  display: inline-flex;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 15px;
  /* Perfect pill shape (50% of 30px height) */
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.meta-pill.num {
  padding: 0 1.5rem;
  background: var(--surface2);
  color: var(--text-s);
  border-color: var(--border-h);
}

.meta-dot {
  width: 3px;
  height: 3px;
  background-color: var(--muted);
  border-radius: 50%;
  opacity: 0.5;
}

.meta-item {
  color: var(--muted);
}

/* Clickable References (sup) */
sup {
  vertical-align: baseline;
  position: relative;
  top: -0.4em;
  font-size: 0.75em;
  line-height: 0;
}

.ref {
  display: inline-flex;
  align-items: center;
  color: var(--muted);
  text-decoration: none;
  padding: 0 0.5rem;
  background-color: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 50px;
  font-family: var(--font-sans);
  font-size: 0.75em;
  font-weight: 600;
  height: 1.15rem;
  transition: all var(--t-fast);
  margin-left: 0.15rem;
  vertical-align: middle;
}

.ref::first-letter {
  color: var(--accent);
  opacity: 0.8;
  margin-right: 1px;
}

.ref:hover {
  color: var(--accent);
  background-color: var(--surface2);
}

.hero-title {
  font-family: var(--font-serif);
  font-size: var(--text-4xl);
  font-weight: 600;
  line-height: 1.1;
  margin-bottom: 2rem;
}

.hero__title-role {
  display: block;
  font-family: var(--font-serif-alt);
  font-weight: 400;
  font-style: italic;
  font-size: 0.85em;
  color: var(--muted);
  margin-top: 0.5rem;
}

.hero-lead {
  font-family: var(--font-sans);
  font-size: var(--text-lg);
  /* Reduced from var(--text-xl) as requested */
  line-height: 1.6;
  color: var(--muted);
}

/* Author Attribution */
.article-author {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-block: 2rem 0;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--muted);
}

.author-avatar {
  width: 32px;
  height: 32px;
  background-color: var(--accent);
  color: var(--accent-i);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.author-link {
  color: var(--text-s);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-fast);
}

.author-link:hover {
  border-color: var(--accent);
}

/*  8. DARK MODE ADJUSTMENTS */
html.dark .callout {
  background-color: var(--surface2);
  border-left-color: var(--accent);
}

html.dark .technique-card {
  background-color: var(--surface);
}

html.dark .example-header {
  background-color: var(--surface);
}

html.dark .example-body {
  background-color: var(--bg);
}

html.dark .data-table th {
  background-color: var(--surface);
}

html.dark .lesson-nav-card {
  background-color: var(--surface);
}

html.dark .lesson-nav-card:hover {
  border-color: var(--accent);
}

/*  9. UTILITIES & ACTIONS */
.btn--copy {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.4rem 0.75rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--t-fast);
}

.btn--copy:hover {
  color: var(--text-s);
  background: var(--surface2);
  border-color: var(--border);
}

.btn--copy.is-success {
  color: #1e8e3e;
}

.btn--copy svg {
  opacity: 0.8;
}

/*  10. PROFESSIONAL REFERENCES SECTION */
.ref-list {
  list-style: none;
  padding: 0;
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.ref-item {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--muted);
  transition: color var(--t-fast);
}

.ref-item:hover {
  color: var(--text-s);
}

.ref-item span {
  display: block;
}

.ref-item i {
  color: var(--text-s);
}

.ref-item a {
  display: inline-block;
  margin-top: 0.25rem;
  color: var(--accent);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  border-bottom: 1px solid transparent;
  transition: all var(--t-fast);
}

.ref-item a:hover {
  border-color: var(--accent);
  opacity: 0.8;
}

/* Section overrides for lesson pages */
.lesson-page .section {
  padding-block: 5rem 2rem;
}

/*  12. LESSON NAVIGATION FOOTER */
.lesson-back-wrap {
  text-align: center;
  margin-block: 2rem 4rem;
}

.lesson-back-wrap .btn--copy {
  padding: 0.8rem 1.5rem;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background-color: var(--surface1);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-p);
  font-weight: 600;
  transition: all 0.2s ease;
}

.lesson-back-wrap .btn--copy:hover {
  background-color: var(--surface2);
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

/*  13. COT FLOW COMPONENT (Lesson 03) */
.cot-flow {
  margin-block: 2.5rem;
  display: flex;
  flex-direction: column;
}

.cot-flow .anatomy-row {
  grid-template-columns: 48px 1fr;
}

.cot-step-num {
  font-family: var(--font-mono, monospace);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--accent);
  padding-top: 0.1em;
}

.cot-step-label {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 0.25rem;
}

.cot-step-content {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  white-space: pre-wrap;
  margin: 0;
}

.cot-step-content.cmt {
  color: var(--muted);
  font-style: italic;
}

/*  14. PRESENTATIONAL CARDS (Lesson 02) */
#tools .technique-card {
  cursor: default;
  pointer-events: none;
}