:root {
  --navy: #052555;
  --navy-mid: #3A4F7A;
  --phys: #C45C26;
  --phys-paper: #F4F6FA;
  --cta: #3D6FD1;
  --link: #2A58B4;
  --lime: #91E424;
  --paper: #FCFDFF;
  --rule: rgba(5, 37, 85, 0.12);
  --bio: #C9922A;
  --bio-paper: #FBFAF7;
  --chem: #1F8A7A;
  --learn: #3D6FD1;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: 56px; }

body {
  font-family: Raleway, Arial, sans-serif;
  color: var(--navy);
  background: #E8E4DC;
  line-height: 1.45;
}

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

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

.site-nav {
  position: sticky;
  top: 0;
  z-index: 40;
  width: 100%;
  background: var(--navy);
  color: #fff;
}
.site-nav-inner {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  flex-wrap: nowrap;
  gap: 4px;
  padding: 10px 0;
  font-family: "Montserrat Alternates", Arial, sans-serif;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  overflow-x: auto;
  white-space: nowrap;
  scrollbar-width: none;
}
.site-nav-inner::-webkit-scrollbar { display: none; }

.site-nav .brand {
  margin-right: 18px;
  font-size: 14px;
  letter-spacing: 0.14em;
  flex-shrink: 0;
}

.site-nav a {
  padding: 7px 12px;
  border-radius: 999px;
  color: rgba(255, 255, 255, 0.7);
  flex-shrink: 0;
}

.site-nav a:hover,
.site-nav a.is-active {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}

.site-nav .other {
  margin-left: auto;
  color: #91E424;
}

.shell {
  width: min(1120px, calc(100% - 32px));
  margin: 24px auto;
  background: #fff;
  overflow: hidden;
}

.hero {
  background: var(--navy);
  color: #fff;
  padding: 72px 64px 56px;
}

.hero .eyebrow {
  font-family: "Montserrat Alternates", Arial, sans-serif;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  opacity: 0.65;
}

.hero h1 {
  font-family: "Montserrat Alternates", Arial, sans-serif;
  font-size: clamp(34px, 5.5vw, 56px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  max-width: 16ch;
  margin: 24px 0 18px;
}

.hero p {
  max-width: 44ch;
  font-size: 18px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.82);
}

.block {
  padding: 56px 64px;
  border-top: 1px solid var(--rule);
}

h2 {
  font-family: "Montserrat Alternates", Arial, sans-serif;
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}

.lead {
  max-width: 56ch;
  font-size: 16px;
  color: var(--navy-mid);
  margin-bottom: 28px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.card-link {
  display: block;
  border: 1px solid var(--rule);
  padding: 28px 24px;
  min-height: 180px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.card-link:hover {
  border-color: var(--navy);
  transform: translateY(-2px);
}

.card-link .num {
  font-family: "Montserrat Alternates", Arial, sans-serif;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.45;
  margin-bottom: 18px;
}

.card-link h3 {
  font-family: "Montserrat Alternates", Arial, sans-serif;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.card-link p {
  font-size: 14px;
  color: var(--navy-mid);
  max-width: 28ch;
}

.card-link .go {
  display: inline-block;
  margin-top: 22px;
  font-family: "Montserrat Alternates", Arial, sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cta);
}

.site-foot {
  padding: 36px 64px;
  background: var(--navy);
  color: rgba(255, 255, 255, 0.75);
  font-size: 14px;
}

.site-foot strong {
  display: block;
  font-family: "Montserrat Alternates", Arial, sans-serif;
  color: #fff;
  font-size: 16px;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

/* Article: AI-snippet + mid offer + parents sell */
.ai-answer {
  margin: 0 0 28px;
  padding: 22px 0 4px;
  color: var(--navy);
}
.ai-answer p {
  font-size: 17.5px !important;
  line-height: 1.55 !important;
  margin: 0 0 12px !important;
  color: var(--navy) !important;
}
.ai-answer p:last-child { margin-bottom: 0 !important; }

.article-cover {
  margin: 0 0 36px;
  width: 100%;
  background: transparent;
  border: 0;
}
.article-cover img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: contain;
  background: transparent;
  display: block;
}

.offer-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  width: 100%;
  margin: 28px 0 32px;
  padding: 18px 22px;
  border-radius: 12px;
  background: var(--navy);
  color: #FEFDFB;
  text-decoration: none;
  transition: transform .15s ease;
}
a.offer-banner:hover { transform: translateY(-2px); }
.offer-banner .offer-k {
  font-family: "Montserrat Alternates", Arial, sans-serif;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent, #E2B100);
  margin-bottom: 6px;
}
.offer-banner .offer-t {
  font-family: "Montserrat Alternates", Arial, sans-serif;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin: 0 0 4px;
  color: #FEFDFB;
}
.offer-banner .offer-d {
  font-size: 14px;
  line-height: 1.35;
  color: rgba(254, 253, 251, 0.78);
  margin: 0;
  max-width: 48ch;
}
.offer-banner .offer-cta {
  flex-shrink: 0;
  font-family: "Montserrat Alternates", Arial, sans-serif;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--accent, #E2B100);
  color: var(--navy);
  padding: 14px 18px;
  border-radius: 999px;
  white-space: nowrap;
}

.parents-sell {
  margin-top: 36px;
  padding: 24px 26px;
  background: #fff;
  border: 1px solid var(--rule);
  border-top: 4px solid var(--accent, #3D6FD1);
  border-radius: 0 0 12px 12px;
}
.parents-sell h2 { margin-top: 0 !important; }
.parents-sell .sell-cta {
  display: inline-block;
  margin-top: 14px;
  font-family: "Montserrat Alternates", Arial, sans-serif;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #fff;
  background: var(--accent, #3D6FD1);
  padding: 12px 18px;
  border-radius: 999px;
  text-decoration: none;
}
.parents-sell .sell-note {
  margin-top: 12px;
  margin-bottom: 0;
  font-size: 14px;
  color: var(--navy-mid);
}

@media (max-width: 700px) {
  .offer-banner { flex-direction: column; align-items: flex-start; }
  .offer-banner .offer-cta { width: 100%; text-align: center; }
}

@media (max-width: 900px) {
  .hero, .block, .site-foot { padding: 32px 22px; }
  .cards { grid-template-columns: 1fr; }
  .site-nav { flex-wrap: wrap; }
}