:root {
  --chain-blue: #2563eb;
  --chain-blue-dark: #0f2f6e;
  --chain-navy: #0f172a;
  --chain-sky: #e0f2fe;
  --chain-yellow: #facc15;
  --chain-yellow-soft: #fffbeb;
  --chain-border: #dbeafe;
  --chain-text: #334155;
  --chain-muted: #64748b;
  --chain-bg: #f8fafc;
  --chain-white: #ffffff;
}

.landing-page {
  color: var(--chain-text);
  background: #ffffff;
}

.landing-page h1,
.landing-page h2,
.landing-page h3 {
  color: var(--chain-navy);
  font-weight: 850;
  letter-spacing: -0.03em;
}

.landing-page p {
  font-size: 1.08rem;
  line-height: 1.7;
}

.chain-hero {
  padding: clamp(4rem, 8vw, 7rem) 0;
  background:
    radial-gradient(circle at 8% 18%, rgba(250, 204, 21, 0.18), transparent 20rem),
    radial-gradient(circle at 90% 8%, rgba(37, 99, 235, 0.12), transparent 24rem),
    linear-gradient(180deg, #ffffff 0%, #eff6ff 100%);
  position: relative;
  overflow: hidden;
}

.chain-hero::after {
  content: "x²  √  %  π  a²+b²=c²";
  position: absolute;
  right: 3vw;
  bottom: 1.5rem;
  font-size: clamp(2rem, 5vw, 4.5rem);
  font-weight: 900;
  color: rgba(37, 99, 235, 0.055);
  letter-spacing: 0.08em;
  pointer-events: none;
  white-space: nowrap;
}

.chain-hero h1 {
  font-size: clamp(2.4rem, 5vw, 4.9rem);
  line-height: 1.03;
  max-width: 820px;
  margin-bottom: 1.2rem;
}

.chain-hero h2 {
  font-size: clamp(1.25rem, 2.2vw, 1.75rem);
  line-height: 1.35;
  color: var(--chain-blue-dark);
  max-width: 760px;
  margin-bottom: 1.5rem;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.8rem;
  margin-bottom: 1.25rem;
  border-radius: 999px;
  background: var(--chain-yellow-soft);
  border: 1px solid #fde68a;
  color: #92400e;
  font-weight: 850;
  font-size: 0.92rem;
  letter-spacing: 0.06em;
}

.eyebrow::before {
  content: "🔗";
  font-size: 1rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 2rem;
}

.cta-button {
  font-weight: 800;
  border-radius: 999px;
  padding-inline: 1.4rem;
  box-shadow: 0 14px 30px rgba(37, 99, 235, 0.24);
}

.btn-primary.cta-button {
  background: var(--chain-blue);
  border-color: var(--chain-blue);
}

.btn-primary.cta-button:hover,
.btn-primary.cta-button:focus {
  background: var(--chain-blue-dark);
  border-color: var(--chain-blue-dark);
}

.btn-outline-primary {
  border-radius: 999px;
  font-weight: 750;
}

.micro-note {
  margin-top: 1rem;
  color: var(--chain-muted);
  font-size: 0.98rem;
}

.hero-image-card {
  padding: 0.75rem;
  border-radius: 2rem;
  background: #ffffff;
  box-shadow: 0 24px 70px rgba(15, 23, 42, 0.14);
  border: 1px solid var(--chain-border);
  max-width: 520px;
}

.hero-image-card img {
  width: 100%;
  display: block;
  border-radius: 1.45rem;
}

.section {
  padding: clamp(3.5rem, 7vw, 6rem) 0;
}

.soft-section {
  background:
    radial-gradient(circle at 15% 25%, rgba(250, 204, 21, 0.12), transparent 18rem),
    linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
}

.section-heading {
  max-width: 820px;
  margin: 0 auto 2.5rem auto;
  text-align: center;
}

.section-heading h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 1rem;
}

.point-card,
.feature-card,
.audience-card,
.testimonial-card,
.faq-item,
.demo-card,
.guarantee-card,
.offer-card,
.chain-box {
  background: #ffffff;
  border: 1px solid var(--chain-border);
  border-radius: 1.5rem;
  padding: 1.5rem;
  box-shadow: 0 16px 42px rgba(15, 23, 42, 0.06);
}

.point-card {
  height: 100%;
  position: relative;
}

.point-card::before {
  content: "✓";
  width: 2.2rem;
  height: 2.2rem;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: var(--chain-yellow);
  color: #111827;
  font-weight: 900;
  margin-bottom: 1rem;
}

.point-card h3,
.feature-card h3,
.audience-card h3,
.faq-item h3 {
  font-size: 1.2rem;
  margin-bottom: 0.6rem;
}

.chain-box {
  background:
    radial-gradient(circle at top right, rgba(250, 204, 21, 0.18), transparent 13rem),
    #ffffff;
  border-color: #bfdbfe;
}

.chain-box h3 {
  color: var(--chain-blue-dark);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.15rem;
}

.feature-card {
  min-height: 100%;
}

.feature-card h3::before {
  content: "🔗 ";
}

.demo-section {
  background: #eff6ff;
}

.demo-card {
  max-width: 920px;
  margin: 0 auto;
  text-align: center;
  border-color: #bfdbfe;
}

.topic-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  justify-content: center;
}

.topic-item {
  padding: 0.7rem 1rem;
  border-radius: 999px;
  background: #eff6ff;
  color: #1e3a8a;
  border: 1px solid #bfdbfe;
  font-weight: 750;
}

.topic-item:nth-child(even) {
  background: #fffbeb;
  color: #92400e;
  border-color: #fde68a;
}

.teacher-section {
  background: #ffffff;
}

.teacher-photo {
  width: 100%;
  max-width: 320px;
  display: block;
  margin: 0 auto;
  border-radius: 1.5rem;
  box-shadow: 0 20px 55px rgba(15, 23, 42, 0.14);
}

.proof-section {
  background: #f8fafc;
}

.testimonial-card {
  height: 100%;
  font-size: 1.12rem;
}

.offer-section {
  background:
    radial-gradient(circle at 80% 0%, rgba(37, 99, 235, 0.12), transparent 20rem),
    radial-gradient(circle at 10% 80%, rgba(250, 204, 21, 0.16), transparent 20rem),
    #ffffff;
}

.offer-card {
  max-width: 880px;
  margin: 0 auto;
  text-align: center;
  padding: clamp(2rem, 5vw, 3.5rem);
  border-color: #bfdbfe;
}

.final-price {
  font-size: clamp(3rem, 8vw, 5.5rem);
  line-height: 1;
  font-weight: 950;
  color: var(--chain-blue);
  margin: 1rem 0;
  letter-spacing: -0.05em;
}

.offer-list {
  max-width: 620px;
  margin: 2rem auto;
  text-align: left;
}

.offer-list ul {
  margin-bottom: 0;
}

.offer-list li {
  margin-bottom: 0.55rem;
}

.urgency-box {
  margin: 2rem auto;
  padding: 1rem 1.2rem;
  border-radius: 1.2rem;
  max-width: 680px;
  background: var(--chain-yellow-soft);
  border: 1px solid #fde68a;
  color: #92400e;
  font-weight: 700;
}

.guarantee-section {
  background: #eff6ff;
}

.guarantee-card {
  max-width: 820px;
  margin: 0 auto;
  text-align: center;
  border-color: #bfdbfe;
}

.faq-section {
  background: #ffffff;
}

.faq-item {
  max-width: 860px;
  margin: 0 auto 1rem auto;
}

.final-cta-section {
  padding: clamp(4rem, 8vw, 7rem) 0;
  text-align: center;
  color: #ffffff;
  background:
    radial-gradient(circle at top right, rgba(250, 204, 21, 0.28), transparent 24rem),
    linear-gradient(135deg, #0f172a 0%, #1e3a8a 60%, #2563eb 100%);
}

.final-cta-section h2,
.final-cta-section h3,
.final-cta-section p {
  color: #ffffff;
}

.final-cta-section h2 {
  font-size: clamp(2rem, 5vw, 4rem);
}

.final-summary {
  margin: 1.5rem auto 2rem auto;
  font-size: 1.15rem;
}

.final-cta-section .btn-primary.cta-button {
  background: var(--chain-yellow);
  border-color: var(--chain-yellow);
  color: #111827;
}

.final-cta-section .btn-primary.cta-button:hover,
.final-cta-section .btn-primary.cta-button:focus {
  background: #f59e0b;
  border-color: #f59e0b;
  color: #111827;
}

#title-block-header,
.quarto-title-meta {
  display: none;
}

.navbar,
#quarto-header {
  display: none;
}

@media (max-width: 991.98px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .chain-hero {
    text-align: center;
  }

  .hero-actions {
    justify-content: center;
  }
}

@media (max-width: 575.98px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 3rem 0;
  }

  .chain-hero {
    padding: 3.5rem 0;
  }

  .chain-hero::after {
    display: none;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .hero-image-card {
    border-radius: 1.25rem;
    max-width: 340px;
    padding: 0.5rem;
  }

  .hero-image-card img {
    border-radius: 1rem;
  }

  .point-card,
  .feature-card,
  .audience-card,
  .testimonial-card,
  .faq-item,
  .demo-card,
  .guarantee-card,
  .offer-card,
  .chain-box {
    border-radius: 1.15rem;
    padding: 1.2rem;
  }
}