:root {
  color-scheme: light;
  --ink: #1f2522;
  --muted: #647067;
  --line: #d9ded8;
  --paper: #fffdf8;
  --soft: #f3f0e8;
  --mint: #d9efe3;
  --blue: #246b8f;
  --green: #2f7a55;
  --yellow: #f7c948;
  --max: 1080px;
  --content: 760px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
}

a {
  color: var(--blue);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.16em;
}

img {
  display: block;
  width: 100%;
  height: auto;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: #fff;
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav {
  max-width: var(--max);
  margin: 0 auto;
  min-height: 60px;
  padding: 0 20px;
  display: grid;
  grid-template-columns: minmax(150px, 1fr) auto;
  align-items: center;
  gap: 16px;
}

.brand {
  font-weight: 800;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
}

.nav-links {
  display: grid;
  grid-template-columns: repeat(3, minmax(58px, auto));
  align-items: center;
  justify-content: end;
  gap: 6px;
  font-size: 0.95rem;
}

.nav-links a {
  color: var(--ink);
  text-align: center;
  text-decoration: none;
  padding: 8px 10px;
  min-width: 58px;
  border-radius: 6px;
}

.nav-links a:hover {
  background: var(--soft);
}

.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: 28px 20px 14px;
}

.kicker {
  margin: 0 0 10px;
  color: var(--green);
  font-size: 0.86rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0;
}

h1 {
  max-width: 780px;
  margin: 0;
  font-size: clamp(2rem, 5vw, 3.9rem);
  line-height: 1.02;
  letter-spacing: 0;
}

.dek {
  max-width: 720px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 1.18rem;
}

.hero-image {
  max-width: var(--max);
  margin: 18px auto 0;
  padding: 0 20px;
}

.hero-image img {
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--line);
}

.content {
  max-width: var(--content);
  margin: 0 auto;
  padding: 26px 20px 64px;
}

.content h2 {
  margin: 36px 0 10px;
  font-size: 1.75rem;
  line-height: 1.15;
}

.content h3 {
  margin: 24px 0 8px;
  font-size: 1.2rem;
}

.content p,
.content li {
  font-size: 1.03rem;
}

.quick-card {
  margin: 0 0 28px;
  border: 1px solid var(--line);
  background: var(--soft);
  padding: 18px;
}

.quick-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 14px 0 0;
}

.fact {
  border-left: 4px solid var(--yellow);
  background: #fffaf0;
  padding: 10px 12px;
}

.fact strong {
  display: block;
  font-size: 0.88rem;
}

.callout {
  margin: 26px 0;
  padding: 16px 18px;
  background: var(--mint);
  border-left: 5px solid var(--green);
}

.steps {
  padding-left: 22px;
}

.steps li {
  margin: 12px 0;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 620px;
}

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

th {
  background: var(--soft);
}

.related {
  margin-top: 44px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.related ul {
  padding-left: 20px;
}

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  padding: 24px 20px;
}

.site-footer p {
  max-width: var(--max);
  margin: 0 auto;
}

.home-list {
  max-width: var(--max);
  margin: 0 auto;
  padding: 24px 20px 64px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}

.article-card {
  border: 1px solid var(--line);
  background: #fff;
  padding: 16px;
}

.article-card h2 {
  margin: 12px 0 8px;
  font-size: 1.25rem;
}

.card-shell {
  max-width: 860px;
  margin: 0 auto;
  padding: 22px 20px 64px;
}

.kid-card {
  border: 1px solid var(--line);
  background: #fff;
  padding: 16px;
}

.kid-card h1 {
  max-width: none;
  font-size: clamp(2.25rem, 8vw, 4.8rem);
  line-height: 0.98;
}

.card-meta {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin: 18px 0;
}

.meta-tile {
  background: var(--soft);
  border: 1px solid var(--line);
  padding: 10px;
  min-height: 74px;
}

.meta-tile strong {
  display: block;
  font-size: 0.78rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin: 20px 0;
}

.step-tile {
  border: 1px solid var(--line);
  min-height: 150px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: var(--mint);
}

.step-number {
  width: 38px;
  height: 38px;
  display: inline-grid;
  place-items: center;
  background: var(--yellow);
  font-weight: 900;
}

.step-tile p {
  margin: 16px 0 0;
  font-size: clamp(1.25rem, 3vw, 1.8rem);
  line-height: 1.1;
  font-weight: 850;
}

.parent-strip {
  margin-top: 16px;
  border-left: 6px solid var(--blue);
  background: #eef7fb;
  padding: 14px;
}

.library-grid {
  max-width: var(--max);
  margin: 0 auto;
  padding: 24px 20px 64px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 12px;
}

.mini-card {
  display: block;
  min-height: 142px;
  border: 1px solid var(--line);
  background: #fff;
  padding: 14px;
  text-decoration: none;
  color: var(--ink);
}

.mini-card strong {
  display: block;
  font-size: 1.35rem;
  line-height: 1.05;
  margin-bottom: 12px;
}

.mini-card span {
  display: block;
  color: var(--muted);
}

.seo-page {
  max-width: var(--max);
  margin: 0 auto;
  padding: 12px 20px 64px;
}

.seo-table {
  margin: 18px 0 24px;
  background: #fff;
}

.seo-activity-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px;
}

.seo-activity {
  border: 1px solid var(--line);
  background: #fff;
  padding: 14px;
  display: grid;
  gap: 12px;
  align-content: start;
}

.seo-activity h2 {
  margin: 0 0 6px;
  font-size: 1.35rem;
  line-height: 1.08;
}

.seo-activity p {
  margin: 0;
}

.activity-materials {
  border-left: 4px solid var(--yellow);
  background: #fffaf0;
  padding: 10px 12px;
}

.activity-materials strong {
  display: block;
  color: var(--muted);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0;
}

.activity-parent {
  border-left: 4px solid var(--blue);
  background: #eef7fb;
  padding: 10px 12px;
}

.small-link {
  font-weight: 800;
}

.test-pack {
  max-width: var(--max);
  margin: 0 auto;
  padding: 12px 20px 64px;
}

.test-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 10px;
  margin: 22px 0;
}

.test-summary div,
.script-box,
.watch-box,
.test-log {
  border: 1px solid var(--line);
  background: #fff;
  padding: 14px;
}

.test-summary strong,
.script-box strong,
.watch-box strong,
.test-log strong {
  display: block;
  color: var(--green);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0;
}

.test-activity {
  margin: 24px 0;
  border: 1px solid var(--line);
  background: #fff;
  padding: 18px;
}

.test-activity h2 {
  margin: 0;
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  line-height: 1.08;
}

.activity-intent {
  margin: 8px 0 16px;
  color: var(--muted);
  font-size: 1.05rem;
}

.test-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 14px;
  margin: 16px 0;
}

.test-activity ol,
.test-activity ul {
  padding-left: 22px;
}

.test-activity li {
  margin: 7px 0;
}

.test-log {
  background: #fffaf0;
}

.test-log p {
  margin: 8px 0 0;
}

.source-grid {
  max-width: var(--max);
  margin: 0 auto;
  padding: 24px 20px 64px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 16px;
}

.source-card {
  border: 1px solid var(--line);
  background: #fff;
  padding: 14px;
}

.source-card h2 {
  margin: 12px 0 6px;
  font-size: 1.2rem;
  line-height: 1.15;
}

.video-frame {
  aspect-ratio: 16 / 9;
  width: 100%;
  border: 0;
  background: var(--soft);
}

.source-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 12px 0;
}

.tag {
  border: 1px solid var(--line);
  background: var(--soft);
  padding: 4px 8px;
  font-size: 0.85rem;
}

.card-steps {
  margin: 10px 0 0;
  padding-left: 18px;
}

.card-steps li {
  margin: 4px 0;
}

@media (max-width: 640px) {
  .nav {
    grid-template-columns: 1fr;
    gap: 6px;
    padding: 10px 16px;
  }

  .nav-links {
    width: 100%;
    justify-content: stretch;
  }

  .nav-links a {
    min-width: 0;
    padding: 8px 4px;
  }

  .quick-grid {
    grid-template-columns: 1fr;
  }

  .test-grid {
    grid-template-columns: 1fr;
  }

  .card-meta,
  .steps-grid {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 2.6rem;
  }
}