:root {
  --bg: #fafafa;
  --panel: #ffffff;
  --ink: #101114;
  --muted: #6b7280;
  --line: #e5e7eb;
  --accent: #0a66ff;
  --accent-2: #00a86b;
  --danger: #b42318;
  --radius: 8px;
  --max: 1080px;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

body {
  margin: 0;
  min-width: 320px;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

button,
input,
textarea,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.site-header,
.admin-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 22px;
  width: min(var(--max), calc(100% - 32px));
  min-height: 62px;
  margin: 0 auto;
  background: rgba(250, 250, 250, 0.86);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.wordmark {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  white-space: nowrap;
}

.wordmark img {
  width: 198px;
  height: auto;
}

.site-nav,
.admin-nav {
  display: flex;
  align-items: center;
  gap: 18px;
  flex: 1;
  overflow-x: auto;
}

.site-nav a,
.nav-admin,
.ghost-link,
.ghost-button {
  color: var(--muted);
  font-size: 14px;
  white-space: nowrap;
}

.site-nav a:hover,
.site-nav a.active,
.nav-admin:hover,
.ghost-link:hover,
.ghost-button:hover {
  color: var(--ink);
}

.nav-admin,
.ghost-link,
.ghost-button {
  border: 0;
  background: transparent;
  padding: 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  font-weight: 900;
}

.brand strong,
.brand small {
  display: block;
}

.brand small {
  color: var(--muted);
  font-size: 12px;
}

.ai-home {
  min-height: calc(100svh - 62px);
}

.ai-stage {
  position: relative;
  display: grid;
  min-height: calc(100svh - 62px);
  overflow: hidden;
  place-items: center;
  touch-action: none;
}

.ai-stage::before {
  position: absolute;
  inset: 48px;
  border: 1px solid var(--line);
  content: "";
  pointer-events: none;
}

.ai-word {
  position: relative;
  display: flex;
  gap: clamp(3px, 1vw, 16px);
  align-items: center;
  border: 0;
  background: transparent;
  color: var(--ink);
  font-size: clamp(58px, 13vw, 168px);
  font-weight: 950;
  letter-spacing: 0;
  line-height: 0.96;
  outline: none;
  opacity: 0;
  transform-style: preserve-3d;
  transition: filter 180ms ease;
  visibility: hidden;
  will-change: transform;
}

.ai-word:hover,
.ai-word:focus-visible {
  filter: drop-shadow(0 20px 45px rgba(10, 102, 255, 0.18));
}

.ai-letter {
  display: inline-block;
  will-change: transform;
}

.ai-letter:nth-child(1) {
  color: var(--accent);
}

.ai-letter:nth-child(2),
.ai-letter:nth-child(3) {
  color: var(--ink);
}

.ai-letter:nth-child(4),
.ai-letter:nth-child(5) {
  color: var(--accent-2);
}

.ai-word.is-bursting {
  filter: drop-shadow(0 28px 52px rgba(0, 168, 107, 0.2));
}

.ai-spark {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 8px;
  height: 8px;
  background: var(--accent-2);
  pointer-events: none;
  will-change: transform, opacity;
}

@media (prefers-reduced-motion: reduce) {
  .ai-word {
    opacity: 1;
    visibility: visible;
  }

  .ai-letter {
    transform: none;
  }
}

main {
  width: 100%;
}

.page-title,
.content-section,
.article-shell,
.admin-main,
.site-footer {
  width: min(var(--max), calc(100% - 32px));
  margin-left: auto;
  margin-right: auto;
}

.page-title {
  padding: 68px 0 24px;
}

.page-title.narrow,
.content-section.narrow,
.article-shell {
  max-width: 760px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

.page-title h1,
.article-hero h1,
.admin-title h1 {
  margin-bottom: 10px;
  font-size: clamp(34px, 5vw, 64px);
  line-height: 1.05;
}

.page-title p,
.article-hero p {
  max-width: 680px;
  color: var(--muted);
  font-size: 18px;
}

.content-section {
  margin-top: 28px;
  margin-bottom: 72px;
}

.section-heading,
.panel-heading,
.admin-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.section-heading h2,
.panel-heading h2,
.group-block h2 {
  margin: 0;
  font-size: 22px;
}

.section-heading a,
.panel-heading a,
.primary-link,
.action-cell a {
  color: var(--accent);
  font-weight: 750;
}

.filter-bar,
.search-row {
  display: flex;
  gap: 10px;
  max-width: 680px;
  margin-top: 26px;
}

input,
textarea,
select {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--ink);
  padding: 9px 11px;
  outline: none;
}

textarea {
  resize: vertical;
}

input:focus,
textarea:focus,
select:focus {
  border-color: var(--accent);
}

.filter-bar select {
  max-width: 160px;
}

.filter-bar button,
.primary-button {
  min-height: 42px;
  border: 0;
  border-radius: var(--radius);
  background: var(--ink);
  color: #fff;
  padding: 0 16px;
  font-weight: 750;
  white-space: nowrap;
}

.article-grid,
.article-list,
.tool-grid,
.resource-grid,
.stat-grid,
.resource-stack,
.admin-list {
  display: grid;
  gap: 12px;
}

.article-grid,
.resource-grid,
.tool-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.article-grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.compact-list {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.article-card,
.tool-card,
.resource-card,
.resource-item,
.admin-panel,
.stat-card,
.login-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.article-card,
.tool-card,
.resource-card,
.resource-item {
  display: block;
  min-height: 100%;
  padding: 18px;
}

.article-card img {
  width: 100%;
  height: 160px;
  margin: -18px -18px 16px;
  max-width: calc(100% + 36px);
  object-fit: cover;
  border-bottom: 1px solid var(--line);
}

.article-card h2,
.article-card h3,
.resource-card h2 {
  margin-bottom: 8px;
  font-size: 20px;
  line-height: 1.3;
}

.article-card p,
.tool-card p,
.resource-card p,
.resource-item p,
.admin-list-item p {
  color: var(--muted);
  margin-bottom: 0;
}

.article-card small {
  display: inline-block;
  margin-top: 14px;
  color: var(--muted);
}

.pill,
.tool-card span,
.resource-card span,
.resource-item span,
.admin-list-item span {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.group-block {
  margin-bottom: 30px;
}

.group-block h2 {
  margin-bottom: 12px;
}

.tab-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.tab-row a {
  color: var(--muted);
  font-size: 14px;
}

.tab-row a.active,
.tab-row a:hover {
  color: var(--ink);
}

.article-shell {
  margin-top: 54px;
  margin-bottom: 72px;
}

.article-hero {
  margin-bottom: 28px;
}

.article-hero img {
  width: 100%;
  max-height: 360px;
  margin-top: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  object-fit: cover;
}

.article-body {
  border-top: 1px solid var(--line);
  padding-top: 30px;
  font-size: 18px;
}

.article-body h2,
.article-body h3 {
  margin-top: 34px;
}

.article-body p,
.article-body li {
  color: #30343b;
}

.article-body pre {
  overflow-x: auto;
  border-radius: var(--radius);
  background: #111827;
  color: #f9fafb;
  padding: 18px;
}

.article-body code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.article-body a {
  color: var(--accent);
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.tag-row span {
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  padding: 4px 10px;
}

.guide-page {
  --guide-bg: #f6f8fb;
  --guide-surface: #ffffff;
  --guide-ink: #172033;
  --guide-muted: #667085;
  --guide-line: #dde4ec;
  --guide-teal: #0f766e;
  --guide-blue: #2563eb;
  --guide-amber: #b7791f;
  --guide-rose: #be123c;
  background: var(--guide-bg);
  color: var(--guide-ink);
  padding-bottom: 72px;
}

.guide-hero,
.guide-shell {
  width: min(1080px, calc(100% - 32px));
  margin-left: auto;
  margin-right: auto;
}

.guide-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  gap: 44px;
  align-items: end;
  padding: 48px 0 34px;
}

.guide-kicker {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  border: 1px solid #c9dedb;
  border-radius: 999px;
  background: #eef8f6;
  color: #0b5f58;
  padding: 0 11px;
  font-size: 13px;
  font-weight: 800;
}

.guide-hero h1 {
  max-width: 760px;
  margin: 18px 0 8px;
  font-size: 42px;
  line-height: 1.12;
}

.guide-hero-subtitle {
  margin-bottom: 10px;
  color: var(--guide-ink) !important;
  font-size: 20px !important;
  font-weight: 850;
}

.guide-hero p {
  max-width: 720px;
  color: var(--guide-muted);
  font-size: 17px;
}

.guide-summary-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.guide-summary-row span {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  border: 1px solid var(--guide-line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.74);
  color: #334155;
  padding: 0 11px;
  font-size: 13px;
  font-weight: 800;
}

.guide-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.guide-hero-actions .primary-button {
  display: inline-grid;
  place-items: center;
  background: var(--guide-teal);
}

.guide-link-button {
  display: inline-grid;
  min-height: 42px;
  place-items: center;
  border: 1px solid var(--guide-line);
  border-radius: var(--radius);
  background: var(--guide-surface);
  color: var(--guide-ink);
  padding: 0 16px;
  font-weight: 750;
}

.guide-shell {
  margin-top: 30px;
  border-top: 1px solid var(--guide-line);
  padding-top: 30px;
}

.guide-route-panel {
  border: 1px solid var(--guide-line);
  border-radius: var(--radius);
  background: var(--guide-surface);
  padding: 18px;
  box-shadow: 0 14px 34px rgba(23, 32, 51, 0.06);
}

.guide-route-panel > span {
  display: block;
  color: var(--guide-teal);
  font-size: 13px;
  font-weight: 900;
  margin-bottom: 12px;
}

.guide-route-panel ol {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.guide-route-panel li {
  border-left: 3px solid var(--guide-line);
  padding-left: 12px;
}

.guide-route-panel li:nth-child(1) {
  border-left-color: var(--guide-teal);
}

.guide-route-panel li:nth-child(2) {
  border-left-color: var(--guide-blue);
}

.guide-route-panel li:nth-child(3) {
  border-left-color: var(--guide-amber);
}

.guide-route-panel strong {
  display: block;
  color: var(--guide-ink);
  font-size: 15px;
  line-height: 1.3;
}

.guide-route-panel p {
  margin: 4px 0 0;
  color: var(--guide-muted);
  font-size: 13px;
}

.guide-page .pill {
  color: var(--guide-teal);
}

.guide-section-title {
  display: flex;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 18px;
}

.guide-section-title.compact {
  margin-bottom: 12px;
}

.guide-section-title h2 {
  margin-bottom: 0;
  color: var(--guide-ink);
  font-size: 25px;
  line-height: 1.22;
}

.guide-section-title p {
  max-width: 360px;
  margin-bottom: 0;
  color: var(--guide-muted);
}

.guide-stack-grid,
.guide-tools-grid,
.guide-scene-grid {
  display: grid;
  gap: 12px;
}

.guide-stack-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.guide-stack-card,
.guide-tool-card,
.guide-scene {
  border: 1px solid var(--guide-line);
  border-radius: var(--radius);
  background: var(--guide-surface);
}

.guide-stack-card {
  display: grid;
  gap: 12px;
  align-content: start;
  padding: 18px;
  box-shadow: 0 10px 26px rgba(23, 32, 51, 0.04);
}

.guide-stack-card > span {
  color: var(--guide-muted);
  font-size: 13px;
  font-weight: 800;
}

.guide-stack-card h3,
.guide-tool-card h3,
.guide-scene h3,
.guide-workflow h3 {
  margin-bottom: 0;
  line-height: 1.25;
}

.guide-stack-card p,
.guide-tool-card p,
.guide-scene p,
.guide-workflow p {
  margin-bottom: 0;
  color: var(--guide-muted);
}

.guide-mini-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.guide-mini-list li,
.guide-tag-row span {
  border: 1px solid var(--guide-line);
  border-radius: 999px;
  background: #f8fafc;
  color: #334155;
  padding: 4px 9px;
  font-size: 12px;
  font-weight: 800;
}

.guide-control-panel {
  position: sticky;
  top: 62px;
  z-index: 12;
  display: grid;
  grid-template-columns: minmax(240px, 340px) minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  border: 1px solid var(--guide-line);
  border-radius: var(--radius);
  background: rgba(246, 248, 251, 0.94);
  padding: 12px;
  margin-bottom: 18px;
  backdrop-filter: blur(14px);
}

.guide-search input {
  border-color: var(--guide-line);
  background: var(--guide-surface);
  min-height: 44px;
}

.guide-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.guide-filter button {
  min-height: 38px;
  border: 1px solid var(--guide-line);
  border-radius: var(--radius);
  background: var(--guide-surface);
  color: var(--guide-muted);
  padding: 0 12px;
  font-weight: 750;
}

.guide-filter button.active {
  border-color: var(--guide-teal);
  background: var(--guide-teal);
  color: #fff;
}

.guide-tools-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.guide-tool-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 100%;
  padding: 18px;
  box-shadow: 0 12px 30px rgba(23, 32, 51, 0.045);
  transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.guide-tool-card:hover {
  border-color: #b7c8d8;
  box-shadow: 0 18px 36px rgba(23, 32, 51, 0.075);
  transform: translateY(-2px);
}

.guide-tool-card[hidden] {
  display: none;
}

.guide-tool-header {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.guide-tool-mark {
  display: grid;
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  place-items: center;
  border: 1px solid #bfd0ff;
  border-radius: var(--radius);
  background: #eff6ff;
  color: var(--guide-blue);
  font-weight: 900;
}

.guide-tool-card[data-category="research"] .guide-tool-mark {
  border-color: #b6e2dd;
  background: #ecfdf8;
  color: var(--guide-teal);
}

.guide-tool-card[data-category="slides"] .guide-tool-mark {
  border-color: #fde68a;
  background: #fffbeb;
  color: var(--guide-amber);
}

.guide-tool-card[data-category="practice"] .guide-tool-mark,
.guide-tool-card[data-category="classroom"] .guide-tool-mark {
  border-color: #fecdd3;
  background: #fff1f2;
  color: var(--guide-rose);
}

.guide-tool-title {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  justify-content: space-between;
}

.guide-tool-title h3 {
  font-size: 20px;
}

.guide-tool-title span {
  border: 1px solid var(--guide-line);
  border-radius: 999px;
  color: var(--guide-muted);
  padding: 2px 8px;
  font-size: 12px;
  font-weight: 800;
}

.guide-tool-header p {
  margin-top: 5px;
  font-size: 14px;
}

.guide-tool-meta {
  display: grid;
  gap: 10px;
  margin: 0;
}

.guide-tool-meta div {
  border-top: 1px solid var(--guide-line);
  padding-top: 10px;
}

.guide-tool-meta dt {
  color: var(--guide-muted);
  font-size: 12px;
  font-weight: 900;
}

.guide-tool-meta dd {
  margin: 4px 0 0;
  color: #30343b;
}

.guide-tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: auto;
}

.guide-open-link {
  color: var(--guide-teal);
  font-weight: 800;
}

.guide-empty {
  border: 1px dashed var(--guide-line);
  border-radius: var(--radius);
  color: var(--guide-muted);
  margin-top: 18px;
  padding: 22px;
  text-align: center;
}

.guide-scene-grid {
  grid-template-columns: repeat(auto-fit, minmax(205px, 1fr));
}

.guide-scene {
  padding: 16px;
  box-shadow: 0 10px 24px rgba(23, 32, 51, 0.035);
}

.guide-scene p {
  margin-top: 10px;
  font-size: 14px;
}

.guide-scene strong {
  color: var(--ink);
}

.guide-workflow {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.guide-workflow li {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 12px;
  border-top: 1px solid var(--guide-line);
  padding-top: 14px;
}

.guide-workflow li > span {
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  border-radius: var(--radius);
  background: var(--guide-ink);
  color: #fff;
  font-weight: 900;
}

.guide-workflow p {
  margin-top: 4px;
}

.guide-notes ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.guide-notes li {
  border: 1px solid var(--guide-line);
  border-radius: var(--radius);
  background: var(--guide-surface);
  color: #30343b;
  padding: 14px;
}

.source-nav-page {
  --source-bg: #f7f8fb;
  --source-panel: #ffffff;
  --source-ink: #172033;
  --source-muted: #667085;
  --source-line: #dce4ee;
  --source-green: #0f766e;
  --source-blue: #2563eb;
  --source-gold: #b7791f;
  --source-red: #be123c;
  background: var(--source-bg);
  color: var(--source-ink);
  padding-bottom: 72px;
}

.source-nav-hero,
.source-nav-shell {
  width: min(1120px, calc(100% - 32px));
  margin-left: auto;
  margin-right: auto;
}

.source-nav-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 42px;
  align-items: end;
  padding: 48px 0 34px;
}

.source-nav-kicker {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  border: 1px solid #c9dedb;
  border-radius: 999px;
  background: #eef8f6;
  color: #0b5f58;
  padding: 0 11px;
  font-size: 13px;
  font-weight: 850;
}

.source-nav-hero h1 {
  max-width: 780px;
  margin: 18px 0 8px;
  font-size: 42px;
  line-height: 1.12;
}

.source-nav-hero p {
  max-width: 760px;
  color: var(--source-muted);
  font-size: 17px;
}

.source-nav-subtitle {
  margin-bottom: 10px;
  color: var(--source-ink) !important;
  font-size: 20px !important;
  font-weight: 850;
}

.source-nav-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.source-nav-stats span {
  display: inline-flex;
  gap: 6px;
  align-items: center;
  min-height: 32px;
  border: 1px solid var(--source-line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  color: #334155;
  padding: 0 12px;
  font-size: 13px;
}

.source-nav-stats strong {
  color: var(--source-green);
}

.source-nav-source {
  border: 1px solid var(--source-line);
  border-radius: var(--radius);
  background: var(--source-panel);
  padding: 18px;
  box-shadow: 0 14px 34px rgba(23, 32, 51, 0.06);
}

.source-nav-source > span,
.source-nav-heading span {
  display: block;
  color: var(--source-green);
  font-size: 13px;
  font-weight: 900;
}

.source-nav-source p {
  margin: 10px 0 14px;
  color: var(--source-muted);
  font-size: 14px;
}

.source-nav-source div {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.source-nav-source a,
.source-tool-tags span,
.source-playbook li {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  border: 1px solid var(--source-line);
  border-radius: 999px;
  background: #f8fafc;
  color: #334155;
  padding: 0 10px;
  font-size: 12px;
  font-weight: 800;
}

.source-nav-shell {
  border-top: 1px solid var(--source-line);
  margin-top: 30px;
  padding-top: 30px;
}

.source-nav-heading {
  display: flex;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 18px;
}

.source-nav-heading.compact {
  margin-bottom: 12px;
}

.source-nav-heading h2 {
  margin-bottom: 0;
  color: var(--source-ink);
  font-size: 25px;
  line-height: 1.22;
}

.source-nav-heading p {
  max-width: 390px;
  margin-bottom: 0;
  color: var(--source-muted);
}

.source-playbook-grid,
.source-tool-grid,
.source-note-grid {
  display: grid;
  gap: 12px;
}

.source-playbook-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.source-playbook,
.source-tool-card,
.source-note-grid p,
.source-nav-warnings li {
  border: 1px solid var(--source-line);
  border-radius: var(--radius);
  background: var(--source-panel);
  box-shadow: 0 10px 26px rgba(23, 32, 51, 0.04);
}

.source-playbook {
  display: grid;
  align-content: start;
  gap: 12px;
  padding: 18px;
}

.source-playbook h3,
.source-tool-card h3 {
  margin-bottom: 0;
  line-height: 1.25;
}

.source-playbook ul,
.source-nav-warnings ul {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.source-playbook p,
.source-tool-card p,
.source-note-grid p {
  margin-bottom: 0;
  color: var(--source-muted);
}

.source-nav-controls {
  position: sticky;
  top: 62px;
  z-index: 12;
  display: grid;
  grid-template-columns: minmax(250px, 360px) minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  border: 1px solid var(--source-line);
  border-radius: var(--radius);
  background: rgba(247, 248, 251, 0.94);
  padding: 12px;
  margin-bottom: 18px;
  backdrop-filter: blur(14px);
}

.source-nav-controls input {
  min-height: 44px;
  border-color: var(--source-line);
  background: var(--source-panel);
}

.source-nav-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.source-nav-filter button {
  min-height: 38px;
  border: 1px solid var(--source-line);
  border-radius: var(--radius);
  background: var(--source-panel);
  color: var(--source-muted);
  padding: 0 12px;
  font-weight: 750;
}

.source-nav-filter button.active {
  border-color: var(--source-green);
  background: var(--source-green);
  color: #fff;
}

.source-tool-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.source-tool-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 100%;
  padding: 18px;
  transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.source-tool-card:hover {
  border-color: #b7c8d8;
  box-shadow: 0 18px 36px rgba(23, 32, 51, 0.075);
  transform: translateY(-2px);
}

.source-tool-card[hidden] {
  display: none;
}

.source-tool-card header {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.source-tool-mark {
  display: grid;
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  place-items: center;
  border: 1px solid #b6e2dd;
  border-radius: var(--radius);
  background: #ecfdf8;
  color: var(--source-green);
  font-weight: 900;
}

.source-tool-card[data-category="lesson"] .source-tool-mark,
.source-tool-card[data-category="resource"] .source-tool-mark {
  border-color: #bfd0ff;
  background: #eff6ff;
  color: var(--source-blue);
}

.source-tool-card[data-category="presentation"] .source-tool-mark,
.source-tool-card[data-category="visual"] .source-tool-mark {
  border-color: #fde68a;
  background: #fffbeb;
  color: var(--source-gold);
}

.source-tool-card[data-category="classroom"] .source-tool-mark,
.source-tool-card[data-category="media"] .source-tool-mark {
  border-color: #fecdd3;
  background: #fff1f2;
  color: var(--source-red);
}

.source-tool-title {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  justify-content: space-between;
}

.source-tool-title h3 {
  font-size: 20px;
}

.source-tool-title span {
  border: 1px solid var(--source-line);
  border-radius: 999px;
  color: var(--source-muted);
  padding: 2px 8px;
  font-size: 12px;
  font-weight: 800;
}

.source-tool-card header p {
  margin-top: 5px;
  font-size: 14px;
}

.source-tool-card dl {
  display: grid;
  gap: 10px;
  margin: 0;
}

.source-tool-card dl div {
  border-top: 1px solid var(--source-line);
  padding-top: 10px;
}

.source-tool-card dt {
  color: var(--source-muted);
  font-size: 12px;
  font-weight: 900;
}

.source-tool-card dd {
  margin: 4px 0 0;
  color: #30343b;
}

.source-tool-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: auto;
}

.source-tool-open {
  color: var(--source-green);
  font-weight: 800;
}

.source-nav-empty {
  border: 1px dashed var(--source-line);
  border-radius: var(--radius);
  color: var(--source-muted);
  margin-top: 18px;
  padding: 22px;
  text-align: center;
}

.source-note-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.source-note-grid p,
.source-nav-warnings li {
  padding: 14px;
}

.source-nav-warnings ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.github-library-page {
  --github-bg: #f7f8fb;
  --github-panel: #ffffff;
  --github-ink: #172033;
  --github-muted: #667085;
  --github-line: #dce4ee;
  --github-green: #0f766e;
  --github-blue: #2563eb;
  --github-gold: #b7791f;
  --github-rose: #be123c;
  background: var(--github-bg);
  color: var(--github-ink);
  padding-bottom: 72px;
}

.github-library-hero,
.github-library-shell {
  width: min(1120px, calc(100% - 32px));
  margin-left: auto;
  margin-right: auto;
}

.github-library-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 42px;
  align-items: end;
  padding: 48px 0 34px;
}

.github-library-kicker {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  border: 1px solid #c9dedb;
  border-radius: 999px;
  background: #eef8f6;
  color: #0b5f58;
  padding: 0 11px;
  font-size: 13px;
  font-weight: 850;
}

.github-library-hero h1 {
  max-width: 820px;
  margin: 18px 0 8px;
  font-size: 42px;
  line-height: 1.12;
}

.github-library-hero p {
  max-width: 760px;
  color: var(--github-muted);
  font-size: 17px;
}

.github-library-subtitle {
  margin-bottom: 10px;
  color: var(--github-ink) !important;
  font-size: 20px !important;
  font-weight: 850;
}

.github-library-stats,
.github-library-source div,
.github-kit-sources div {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.github-library-stats {
  margin-top: 18px;
}

.github-library-stats span {
  display: inline-flex;
  gap: 6px;
  align-items: center;
  min-height: 32px;
  border: 1px solid var(--github-line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  color: #334155;
  padding: 0 12px;
  font-size: 13px;
}

.github-library-stats strong {
  color: var(--github-green);
}

.github-library-source,
.github-plan-card,
.github-kit-card,
.github-library-notes li {
  border: 1px solid var(--github-line);
  border-radius: var(--radius);
  background: var(--github-panel);
  box-shadow: 0 10px 26px rgba(23, 32, 51, 0.04);
}

.github-library-source {
  padding: 18px;
}

.github-library-source > span,
.github-library-heading span,
.github-kit-body span,
.github-kit-sources > span {
  display: block;
  color: var(--github-green);
  font-size: 13px;
  font-weight: 900;
}

.github-library-source p {
  margin: 10px 0 14px;
  color: var(--github-muted);
  font-size: 14px;
}

.github-library-source a,
.github-kit-sources a {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  border: 1px solid var(--github-line);
  border-radius: 999px;
  background: #f8fafc;
  color: #334155;
  padding: 0 10px;
  font-size: 12px;
  font-weight: 800;
}

.github-library-shell {
  border-top: 1px solid var(--github-line);
  margin-top: 30px;
  padding-top: 30px;
}

.github-library-heading {
  display: flex;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 18px;
}

.github-library-heading.compact {
  margin-bottom: 12px;
}

.github-library-heading h2 {
  margin-bottom: 0;
  color: var(--github-ink);
  font-size: 25px;
  line-height: 1.22;
}

.github-library-heading p {
  max-width: 410px;
  margin-bottom: 0;
  color: var(--github-muted);
}

.github-plan-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.github-plan-card {
  display: grid;
  gap: 12px;
  align-content: start;
  padding: 18px;
}

.github-plan-card h3 {
  margin-bottom: 0;
}

.github-plan-card p {
  color: var(--github-muted);
  margin-bottom: 0;
}

.github-plan-card ul,
.github-library-notes ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.github-plan-card li {
  border-top: 1px solid var(--github-line);
  color: #30343b;
  padding-top: 9px;
}

.github-library-controls {
  --source-bg: var(--github-bg);
  --source-panel: var(--github-panel);
  --source-line: var(--github-line);
  --source-green: var(--github-green);
  margin-bottom: 18px;
}

.github-kit-list {
  display: grid;
  gap: 16px;
}

.github-kit-card {
  overflow: hidden;
}

.github-kit-card[hidden] {
  display: none;
}

.github-kit-head {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  border-bottom: 1px solid var(--github-line);
  padding: 18px;
}

.github-kit-index {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border: 1px solid #b6e2dd;
  border-radius: var(--radius);
  background: #ecfdf8;
  color: var(--github-green);
  font-size: 14px;
  font-weight: 900;
}

.github-kit-card[data-category="curriculum"] .github-kit-index {
  border-color: #bfd0ff;
  background: #eff6ff;
  color: var(--github-blue);
}

.github-kit-card[data-category="coding"] .github-kit-index,
.github-kit-card[data-category="visual"] .github-kit-index {
  border-color: #fde68a;
  background: #fffbeb;
  color: var(--github-gold);
}

.github-kit-card[data-category="classroom"] .github-kit-index,
.github-kit-card[data-category="club"] .github-kit-index {
  border-color: #fecdd3;
  background: #fff1f2;
  color: var(--github-rose);
}

.github-kit-head h3 {
  margin: 4px 0 6px;
  font-size: 24px;
  line-height: 1.22;
}

.github-kit-head p {
  margin-bottom: 0;
  color: var(--github-muted);
}

.github-kit-head p:first-child {
  color: var(--github-green);
  font-size: 13px;
  font-weight: 900;
}

.github-kit-body {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 0;
}

.github-kit-body section {
  min-width: 0;
  border-bottom: 1px solid var(--github-line);
  padding: 18px;
}

.github-kit-body section:nth-child(odd) {
  border-right: 1px solid var(--github-line);
}

.github-kit-body p,
.github-kit-body li {
  color: #30343b;
  overflow-wrap: anywhere;
}

.github-kit-body p {
  margin: 8px 0 0;
}

.github-kit-body ol {
  display: grid;
  gap: 8px;
  margin: 10px 0 0;
  padding-left: 20px;
}

.github-copy-block {
  background: #fbfcfe;
}

.github-copy-block pre {
  overflow-x: auto;
  border: 1px solid var(--github-line);
  border-radius: var(--radius);
  background: #111827;
  color: #f8fafc;
  margin: 10px 0 0;
  padding: 14px;
  white-space: pre-wrap;
}

.github-copy-block code {
  font-size: 13px;
  line-height: 1.65;
  overflow-wrap: anywhere;
}

.github-kit-sources {
  display: grid;
  gap: 10px;
  padding: 16px 18px 18px;
}

.github-kit-sources a {
  gap: 8px;
  min-height: 34px;
}

.github-kit-sources em {
  color: var(--github-muted);
  font-style: normal;
  font-weight: 700;
}

.github-library-notes ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.github-library-notes li {
  color: #30343b;
  padding: 14px;
}

.prose-panel {
  border-top: 1px solid var(--line);
  padding-top: 28px;
}

.empty-state,
.empty-page {
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  color: var(--muted);
  padding: 28px;
  text-align: center;
}

.empty-page {
  width: min(680px, calc(100% - 32px));
  margin: 90px auto;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  padding: 24px 0 32px;
}

.site-footer strong {
  color: var(--ink);
}

.site-footer a {
  color: var(--accent);
}

.login-page {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 24px;
}

.login-panel {
  width: min(420px, 100%);
  padding: 24px;
}

.login-panel h1 {
  margin: 24px 0 18px;
}

.form-error {
  border: 1px solid #ffd5d2;
  border-radius: var(--radius);
  color: var(--danger);
  padding: 10px;
}

.admin-header {
  width: min(1200px, calc(100% - 32px));
}

.admin-main {
  width: min(1200px, calc(100% - 32px));
  margin-top: 34px;
  margin-bottom: 70px;
}

.admin-title h1 {
  font-size: 36px;
}

.stack-form,
.editor-layout {
  display: grid;
  gap: 14px;
}

.stack-form label,
.editor-layout label {
  display: grid;
  gap: 6px;
}

.stack-form label span,
.editor-layout label span,
.segmented-field legend {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.admin-panel {
  padding: 18px;
}

.stat-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-bottom: 16px;
}

.stat-card {
  padding: 18px;
}

.stat-card span {
  color: var(--muted);
}

.stat-card strong {
  display: block;
  margin-top: 8px;
  font-size: 32px;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 12px 8px;
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--muted);
  font-size: 13px;
}

td small {
  display: block;
  color: var(--muted);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  border-radius: 999px;
  padding: 0 9px;
  font-size: 12px;
  font-weight: 800;
}

.status-badge.published {
  background: #eaf8f0;
  color: #087443;
}

.status-badge.draft {
  background: #f3f4f6;
  color: var(--muted);
}

.action-cell {
  display: flex;
  gap: 12px;
  align-items: center;
}

.action-cell form {
  margin: 0;
}

.text-danger {
  border: 0;
  background: transparent;
  color: var(--danger);
  font-weight: 750;
  padding: 0;
}

.editor-layout {
  grid-template-columns: minmax(0, 1fr) 320px;
  align-items: start;
}

.editor-side {
  position: sticky;
  top: 82px;
}

.markdown-editor {
  min-height: 440px;
}

.segmented-field {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  border: 0;
  margin: 0;
  padding: 0;
}

.segmented-field legend {
  grid-column: 1 / -1;
}

.segmented-field label {
  position: relative;
}

.segmented-field input {
  position: absolute;
  opacity: 0;
}

.segmented-field span {
  display: grid;
  min-height: 40px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--muted);
  font-weight: 800;
}

.segmented-field input:checked + span {
  border-color: var(--ink);
  color: var(--ink);
}

.admin-two-column {
  display: grid;
  grid-template-columns: 360px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}

.admin-list-item {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
}

.check-row {
  display: flex !important;
  align-items: center;
}

.check-row input {
  width: 18px;
  min-height: 18px;
}

@media (max-width: 900px) {
  .article-grid,
  .resource-grid,
  .tool-grid,
  .guide-stack-grid,
  .guide-tools-grid,
  .guide-scene-grid,
  .guide-notes ul,
  .source-nav-hero,
  .source-playbook-grid,
  .source-tool-grid,
  .source-note-grid,
  .source-nav-warnings ul,
  .github-library-hero,
  .github-plan-grid,
  .github-kit-body,
  .github-library-notes ul,
  .compact-list,
  .stat-grid,
  .editor-layout,
  .admin-two-column {
    grid-template-columns: 1fr;
  }

  .guide-section-title,
  .guide-hero,
  .guide-control-panel,
  .source-nav-controls {
    grid-template-columns: 1fr;
  }

  .guide-section-title,
  .source-nav-heading,
  .github-library-heading {
    display: grid;
    gap: 10px;
  }

  .guide-section-title p,
  .source-nav-heading p,
  .github-library-heading p {
    max-width: none;
  }

  .guide-control-panel,
  .source-nav-controls {
    position: static;
  }

  .editor-side {
    position: static;
  }

  .github-kit-body section:nth-child(odd) {
    border-right: 0;
  }
}

@media (max-width: 640px) {
    .site-header,
    .admin-header,
    .page-title,
    .content-section,
    .article-shell,
    .guide-hero,
    .guide-shell,
    .source-nav-hero,
    .source-nav-shell,
    .github-library-hero,
    .github-library-shell,
    .admin-main,
    .site-footer {
    width: min(100% - 20px, var(--max));
  }

  .site-header,
  .admin-header {
    gap: 14px;
  }

  .wordmark img {
    width: 136px;
  }

  .site-nav,
  .admin-nav {
    gap: 12px;
  }

  .ai-stage::before {
    inset: 20px;
  }

  .ai-word {
    font-size: clamp(44px, 14vw, 58px);
    gap: clamp(1px, 0.6vw, 5px);
  }

  .guide-hero {
    padding-top: 38px;
  }

  .guide-hero h1 {
    font-size: 34px;
  }

  .source-nav-hero {
    padding-top: 38px;
  }

  .github-library-hero {
    padding-top: 38px;
  }

  .source-nav-hero h1 {
    font-size: 34px;
  }

  .github-library-hero h1 {
    font-size: 34px;
  }

  .guide-hero p {
    font-size: 16px;
  }

  .source-nav-hero p {
    font-size: 16px;
  }

  .github-library-hero p {
    font-size: 16px;
  }

  .filter-bar,
  .site-footer,
  .admin-title,
  .admin-list-item {
    align-items: stretch;
    flex-direction: column;
  }

  .filter-bar select {
    max-width: none;
  }

  .action-cell {
    flex-wrap: wrap;
  }
}