/* Lesson pages — requires global.css */

/* ── Layout ── */
.lesson-container {
  display: grid;
  grid-template-columns: 0 17.5rem 1fr;
  min-height: calc(100vh - 3.875rem);
  transition: grid-template-columns 0.25s ease;
}

.lesson-container.sidebar-collapsed {
  grid-template-columns: 2rem 0 1fr;
}

/* ── Sidebar tab — hidden when sidebar is open, visible when collapsed ── */
.lesson-sidebar-tab {
  grid-column: 1;
  grid-row: 1;
  align-self: start;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  transform: rotate(180deg);
  background: var(--bg-card);
  border: none;
  border-right: 1px solid var(--border);
  color: var(--primary);
  font-family: "Sora", sans-serif;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  cursor: pointer;
  padding: 1.25rem 0.5rem;
  display: none;
  align-items: center;
  justify-content: center;
  position: sticky;
  top: 3.875rem;
  height: calc(100vh - 3.875rem);
  transition:
    background 0.15s,
    color 0.15s;
  z-index: 10;
}

.sidebar-collapsed .lesson-sidebar-tab {
  display: flex;
}

.lesson-sidebar-tab:hover {
  background: var(--bg-alt);
  color: var(--primary-d);
}

.lesson-content-wrap {
  display: flex;
  justify-content: center;
  gap: 2rem;
  align-items: flex-start;
  padding: 0.75rem 4rem;
}

/* ── Sidebar ── */
.lesson-sidebar {
  grid-column: 2;
  background: var(--bg-alt);
  border-right: 1px solid var(--border);
  padding: 1.5rem 0;
  position: sticky;
  top: 3.875rem;
  height: calc(100vh - 3.875rem);
  overflow-y: auto;
  overflow-x: hidden;
  transition: all 0.25s ease;
}

.sidebar-collapsed .lesson-sidebar {
  padding: 0;
  border-right: none;
}

.lesson-sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 0.75rem 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1rem;
}

.lesson-sidebar-course {
  flex: 1;
}

.lesson-sidebar-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  padding: 0.25rem 0.5rem;
  line-height: 1;
  border-radius: 0.25rem;
  transition:
    color 0.15s,
    background 0.15s;
}

.lesson-sidebar-close:hover {
  color: var(--text);
  background: var(--bg-alt);
}

.lesson-sidebar-course a {
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
}

.lesson-sidebar-course a:hover {
  color: var(--primary);
}

.lesson-sidebar-nav {
  display: flex;
  flex-direction: column;
}

.lesson-sidebar-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.625rem 1.5rem;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  line-height: 1.4;
  border-left: 2px solid transparent;
  transition: all 0.15s;
}

.lesson-sidebar-item:hover {
  background: rgba(105, 152, 165, 0.15);
  color: var(--text);
}

.lesson-sidebar-item.active {
  background: rgba(105, 152, 165, 0.1);
  color: var(--primary);
  border-left-color: var(--primary);
}

.lesson-sidebar-title {
  flex: 1;
}

.lesson-sidebar-tag {
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-radius: 3px;
  padding: 0.1rem 0.4rem;
  flex-shrink: 0;
}

.lesson-sidebar-tag.tag-project {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary);
}

.lesson-sidebar-tag.tag-quiz {
  background: transparent;
  color: var(--emerald);
  border: 1px solid var(--emerald);
}

.lesson-sidebar-tag.tag-capstone {
  background: transparent;
  color: var(--gold);
  border: 1px solid var(--gold);
}

/* ── Main article ── */
.lesson-main {
  min-width: 0;
  overflow-x: clip;
}

.lesson-article {
  color: var(--text);
  font-size: 1rem;
  line-height: 1.7;
  max-width: 65ch;
  flex: 1;
  min-width: 0;
  overflow-x: clip;
}

.lesson-article h1 {
  font-family: "Crimson Pro", serif;
  font-size: 2.25rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: var(--text);
  line-height: 1.3;
}

.lesson-article h2 {
  font-family: "Crimson Pro", serif;
  font-size: 1.5rem;
  font-weight: 600;
  margin-top: 3rem;
  margin-bottom: 0.75rem;
  color: var(--text);
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.lesson-article h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: var(--text);
}

.lesson-article p {
  margin-bottom: 1.25rem;
  color: var(--text-muted);
}

.lesson-article strong {
  color: var(--text);
  font-weight: 600;
}

.lesson-article em {
  font-style: italic;
}

.lesson-article a {
  color: var(--primary);
  text-decoration: underline;
  text-decoration-color: rgba(105, 152, 165, 0.3);
  text-underline-offset: 0.15em;
  transition: text-decoration-color 0.2s;
}

.lesson-article a.btn-primary {
  color: #fff;
  text-decoration: none;
}

.lesson-article a.btn-ghost {
  text-decoration: none;
}

.lesson-article a:hover {
  text-decoration-color: var(--primary);
}

.lesson-article ul,
.lesson-article ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
  color: var(--text-muted);
}

.lesson-article li {
  margin-bottom: 0.5rem;
}

.lesson-article li::marker {
  color: var(--primary);
}

.lesson-article code {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.875em;
  background: var(--bg-alt);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  color: var(--coral);
}

.lesson-article pre {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
  overflow-x: auto;
}

.lesson-article pre code {
  background: none;
  padding: 0;
  font-size: 0.875rem;
  color: var(--text);
  line-height: 1.6;
}

.lesson-article blockquote {
  border-left: 3px solid var(--primary);
  padding-left: 1.25rem;
  margin: 1.5rem 0;
  color: var(--text-muted);
  font-style: italic;
}

.lesson-article hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

.lesson-article table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
  font-size: 0.9375rem;
}

.lesson-article th,
.lesson-article td {
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  text-align: left;
}

.lesson-article th {
  background: var(--bg-alt);
  font-weight: 600;
  color: var(--text);
}

.lesson-article td {
  color: var(--text-muted);
}

/* ── Blurred preview (gated lessons) ── */
.lesson-preview-body {
  position: relative;
}

.lesson-preview-content {
  -webkit-mask-image: linear-gradient(to bottom, black 40%, transparent 85%);
  mask-image: linear-gradient(to bottom, black 40%, transparent 85%);
  pointer-events: none;
  user-select: none;
}

.lesson-gate {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  padding-bottom: 1rem;
}

.lesson-gate-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 2rem 2.5rem;
  text-align: center;
  max-width: 27.5rem;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.lesson-gate-heading {
  font-family: "Crimson Pro", serif;
  font-size: 1.3rem;
  font-weight: 500;
  color: var(--text) !important;
  margin: 0 !important;
}

.lesson-gate-sub {
  font-size: 0.875rem;
  color: var(--text-muted) !important;
  line-height: 1.6;
  margin: 0 0 0.5rem !important;
}

/* ── Gate card CTA button — needs stronger contrast than primary on dark bg ── */
.lesson-gate-card .btn-primary {
  background: var(--ivory);
  color: var(--text-dark);
  font-weight: 600;
  width: 100%;
  text-align: center;
}
.lesson-gate-card .btn-primary:hover {
  background: var(--ivory-dim);
}

/* ── Signup CTA (open lessons) ── */
.lesson-signup-cta {
  margin: 2rem 0 1rem;
  padding: 1.25rem 1.5rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-left: 3px solid var(--primary);
  border-radius: 0.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.lesson-signup-cta p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9375rem;
  flex: 1;
}

.lesson-signup-btn {
  display: inline-block;
  padding: 0.5rem 1.25rem;
  background: var(--primary);
  color: var(--text-dark);
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  white-space: nowrap;
  text-decoration: none;
  transition: background 0.15s;
}

.lesson-signup-btn:hover {
  background: var(--primary-d);
  color: var(--text-dark);
}

.lesson-article a.lesson-signup-btn {
  color: var(--text-dark);
  text-decoration: none;
}

/* ── Footer prev/next ── */
.lesson-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.lesson-nav-prev,
.lesson-nav-next {
  display: flex;
  flex-direction: column;
  padding: 1rem 1.25rem;
  background: var(--bg-alt);
  border-radius: 0.5rem;
  text-decoration: none;
  max-width: 45%;
  transition: background 0.15s;
}

.lesson-nav-prev:hover,
.lesson-nav-next:hover {
  background: var(--border);
}

.lesson-nav-next {
  text-align: right;
  align-items: flex-end;
}

.lesson-nav-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 0.25rem;
}

.lesson-nav-text {
  color: var(--text);
  font-weight: 500;
}

.lesson-nav-arrow {
  color: var(--primary);
  font-size: 1.25rem;
}

.lesson-nav-prev .lesson-nav-arrow {
  margin-bottom: 0.25rem;
}

.lesson-nav-next .lesson-nav-arrow {
  margin-bottom: 0.25rem;
}

/* ── Right TOC ── */
.lesson-toc {
  position: sticky;
  top: calc(3.875rem + 2rem);
  height: fit-content;
  width: 12.5rem;
  flex-shrink: 0;
  padding: 0 1rem;
  border-left: 1px solid var(--border);
  align-self: start;
}

.lesson-toc-title {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.lesson-toc-nav {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-bottom: 2rem;
}

.lesson-toc-link {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.15rem 0 0.15rem 0.5rem;
  line-height: 1.4;
  border-left: 2px solid transparent;
  transition: color 0.15s;
}

.lesson-toc-link:hover {
  color: var(--text);
}

.lesson-toc-link.active {
  color: var(--primary);
  border-left-color: var(--primary);
}

/* ── Sidebar search ── */
.lesson-sidebar-search {
  padding: 0 1rem 0.75rem;
}

.lesson-sidebar-search-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.5rem 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-muted);
  font-family: "Sora", sans-serif;
  font-size: 0.8125rem;
  cursor: pointer;
  transition:
    border-color 0.15s,
    color 0.15s;
  text-align: left;
  text-decoration: none;
}

.lesson-sidebar-search-btn:hover {
  border-color: var(--primary);
  color: var(--text);
}

/* ── Light theme overrides ── */
[data-theme="light"] .lesson-sidebar-course {
  border-bottom-color: var(--border);
}

[data-theme="light"] .lesson-sidebar-item:hover {
  background: rgba(105, 152, 165, 0.1);
  color: var(--text);
}

[data-theme="light"] .lesson-sidebar-item.active {
  background: rgba(105, 152, 165, 0.15);
}

[data-theme="light"] .lesson-toc {
  border-left-color: var(--border);
}

/* ── Responsive ── */
@media (max-width: 1100px) {
  .lesson-toc {
    display: none;
  }
}

@media (max-width: 900px) {
  .lesson-container {
    grid-template-columns: 1fr;
  }
  .lesson-sidebar {
    display: none;
  }
  .lesson-content-wrap {
    padding: 2rem 1.5rem;
  }
}

/* ── Try It Tabs ── */
.try-it-tabs {
  margin: 1.5rem 0;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  overflow: hidden;
}

.try-it-tab-bar {
  display: flex;
  border-bottom: 1px solid var(--border);
  background: var(--bg-card);
}

.try-it-tab-btn {
  padding: 0.6rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  font-family: inherit;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition:
    color 0.15s,
    border-color 0.15s;
  margin-bottom: -1px;
}

.try-it-tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.try-it-tab-panel {
  padding: 1.25rem 1.5rem;
  display: none;
}

.try-it-tab-panel.active {
  display: block;
}

/* light theme overrides */
[data-theme="light"] .try-it-tabs {
  background: #fff;
}

[data-theme="light"] .try-it-tab-bar {
  background: var(--bg-alt);
}

/* ── Pyodide Code Runner ── */
.code-runner {
  position: relative;
  margin: 1.5rem 0;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  overflow: hidden;
}

.code-runner .code-runner-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.4rem 1rem;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
}

.code-runner .code-runner-header span {
  color: var(--primary);
  font-family: "JetBrains Mono", monospace;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.code-runner .code-runner-actions {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.code-runner .reset-btn {
  background: none;
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 0.3rem 0.8rem;
  border-radius: 4px;
  cursor: pointer;
  font-family: "Sora", sans-serif;
  font-size: 0.8rem;
  transition: all 0.2s;
}

.code-runner .reset-btn:hover {
  color: var(--text);
  border-color: var(--text-muted);
}

.code-runner .run-btn {
  background: var(--primary-d);
  color: #fff;
  border: none;
  padding: 0.3rem 0.8rem;
  border-radius: 4px;
  cursor: pointer;
  font-family: "Sora", sans-serif;
  font-size: 0.8rem;
  transition: background 0.2s;
}

.code-runner .run-btn:hover {
  background: var(--primary);
}

.code-runner .run-btn:disabled {
  opacity: 0.5;
  cursor: default;
}

.code-runner .run-btn.loading {
  background: var(--gold);
  color: var(--text-dark);
}

.code-runner pre,
.code-runner .code-runner-pre {
  margin: 0;
  border-radius: 0;
  border: none;
  min-height: 100%;
  max-height: none;
  overflow-x: auto;
  overflow-y: visible;
}

.code-runner pre code,
.code-runner .code-runner-pre code {
  font-size: 0.9rem;
  display: block;
  min-height: 100%;
}

.code-runner pre[contenteditable],
.code-runner .code-runner-pre[contenteditable] {
  outline: none;
  cursor: text;
}

/* Plain (un-highlighted) editable code area */
.code-runner-pre {
  background: var(--editor-bg);
  color: var(--editor-text);
  font-family: "JetBrains Mono", monospace;
  padding: 1.25rem 1.5rem;
  line-height: 1.6;
  tab-size: 4;
  white-space: pre;
  overflow-x: auto;
}

/* Override .lesson-article code color for runner blocks */
.lesson-article .code-runner .code-runner-pre code,
.lesson-article .code-runner pre code {
  font-family: "JetBrains Mono", monospace;
  background: none;
  padding: 0;
  color: inherit;
  font-size: 0.9rem;
}

[data-theme="light"] .code-runner-pre {
  background: var(--editor-bg-light);
  color: var(--editor-text-light);
}

.code-output {
  padding: 0.8rem 1rem;
  background: var(--bg);
  color: var(--emerald);
  font-family: "JetBrains Mono", monospace;
  font-size: 0.85rem;
  line-height: 1.5;
  border-top: 1px solid var(--border);
  white-space: pre-wrap;
  display: none;
  max-height: 400px;
  overflow-y: auto;
}

.code-output.visible {
  display: block;
}

.code-output.error {
  color: var(--coral);
}

.code-output.success {
  border-top-color: var(--emerald);
}

.code-output img {
  max-width: 100%;
  border-radius: 4px;
  margin-top: 0.5rem;
}

#pyodide-loading {
  position: fixed;
  bottom: 1rem;
  right: 1rem;
  background: var(--bg-card);
  color: var(--gold);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 0.6rem 1.2rem;
  font-family: "Sora", sans-serif;
  font-size: 0.85rem;
  z-index: 1000;
  display: none;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

#pyodide-loading.visible {
  display: block;
}

#pyodide-loading.ready {
  color: var(--emerald);
  border-color: var(--emerald);
}

[data-theme="light"] .code-output {
  background: var(--editor-output-bg-light);
  color: var(--editor-output-text-light);
}

/* ── Try It Block ── */
.try-it-block {
  margin: 2rem 0;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  overflow: hidden;
}

.tryit-header {
  padding: 0.5rem 1.25rem;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  font-size: 0.7rem;
  font-weight: 600;
  font-family: "Sora", sans-serif;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
}

.tryit-body {
  display: grid;
  grid-template-columns: 1fr 4px 1.6fr;
  min-height: 12rem;
}

.tryit-resizer {
  background: var(--border);
  cursor: col-resize;
  transition: background 0.15s;
  position: relative;
}

.tryit-resizer:hover,
.tryit-resizer.dragging {
  background: var(--primary);
}

.tryit-left {
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  overflow: hidden;
}

.tryit-prose {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-muted);
  flex: 1;
}

.tryit-prose p {
  margin-bottom: 0.75rem;
  color: var(--text-muted);
}

.tryit-prose p:last-child {
  margin-bottom: 0;
}

.tryit-reveals {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.tryit-reveal-btn {
  background: none;
  border: none;
  padding: 0.25rem 0;
  font-family: "Sora", sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  cursor: pointer;
  text-align: left;
  transition: color 0.15s;
}

.tryit-reveal-btn:hover {
  color: var(--primary-d);
}

.tryit-right {
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow-x: auto;
}

/* Remove outer margin/border from the code-runner when inside tryit-right */
.tryit-right .code-runner {
  margin: 0;
  border: none;
  border-radius: 0;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.tryit-right .code-runner-pre {
  flex: 1;
  overflow-x: auto;
}

/* Responsive: stack on narrow screens */
@media (max-width: 760px) {
  .tryit-body {
    grid-template-columns: 1fr;
  }

  .tryit-left {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
}

/* ── Scrollytelling blocks ── */
.scrolly-block {
  /* extend into toc column but not past viewport */
  width: calc(100% + 8rem);
  display: flex;
  align-items: flex-start;
  gap: 0;
  position: relative;
  margin-top: 2rem;
  margin-bottom: 2rem;
}

.scrolly-steps {
  width: 38%;
  min-width: 16rem;
  padding: 0 2rem;
  position: relative;
  z-index: 2;
}

.scrolly-step {
  min-height: 80vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 2rem 0;
}

.scrolly-step h3 {
  font-family: "Crimson Pro", serif;
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.75rem;
}

.scrolly-step p {
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--text);
  margin-bottom: 0.75rem;
}

.scrolly-step.is-active h3 {
  color: var(--primary);
}

.scrolly-figure {
  width: 62%;
  position: sticky;
  top: 5rem;
  height: 75vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.75rem;
  box-sizing: border-box;
}

.scrolly-figure svg {
  width: 100%;
  height: 100%;
  background: transparent;
}

.scrolly-figure svg.clip-overflow {
  overflow: hidden;
}

@media (max-width: 760px) {
  .scrolly-block {
    flex-direction: column;
    width: 100%;
    margin-left: 0;
  }
  .scrolly-steps {
    width: 100%;
    padding: 0;
  }
  .scrolly-figure {
    width: 100%;
    position: relative;
    top: 0;
    height: 60vw;
    min-height: 280px;
    margin-bottom: 1rem;
    order: -1;
  }
  .scrolly-step {
    min-height: 60vh;
  }
}