:root {
  --bg: #f8f4ec;
  --bg-deep: #efe3d2;
  --surface: rgba(255, 251, 245, 0.76);
  --surface-strong: #fffaf1;
  --ink: #1d2433;
  --muted: #5b6474;
  --line: rgba(29, 36, 51, 0.1);
  --coral: #eb6b58;
  --gold: #f2b84b;
  --teal: #3a8d8a;
  --sage: #b5d0ba;
  --shadow: 0 24px 60px rgba(39, 31, 22, 0.12);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 16px;
  --max: 1200px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(235, 107, 88, 0.18), transparent 30%),
    radial-gradient(circle at right 20%, rgba(58, 141, 138, 0.16), transparent 28%),
    linear-gradient(180deg, #fbf6ee 0%, var(--bg) 45%, #f3ebdd 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(29, 36, 51, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(29, 36, 51, 0.03) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 85%);
}

.site-shell {
  width: min(calc(100% - 40px), var(--max));
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--coral), #f9a15a);
  color: white;
  font-weight: 700;
  box-shadow: 0 10px 24px rgba(235, 107, 88, 0.28);
}

.brand-copy {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.brand-copy strong {
  font-size: 1rem;
}

.brand-copy span:last-child {
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 4px;
}

.nav {
  display: flex;
  gap: 24px;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
}

.nav a.is-current {
  color: var(--ink);
  font-weight: 700;
}

.button {
  border: 0;
  border-radius: 999px;
  padding: 14px 22px;
  background: var(--ink);
  color: white;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font: inherit;
  cursor: pointer;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
  box-shadow: 0 14px 30px rgba(29, 36, 51, 0.18);
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
}

.button-outline {
  background: transparent;
  color: var(--ink);
  border: 1px solid rgba(29, 36, 51, 0.15);
  box-shadow: none;
}

.button-ghost {
  background: rgba(255, 255, 255, 0.5);
  color: var(--ink);
  box-shadow: none;
}

.hero {
  display: grid;
  grid-template-columns: 1.02fr 0.98fr;
  gap: 42px;
  align-items: center;
  min-height: calc(100vh - 110px);
  padding: 36px 0 54px;
}

.eyebrow {
  margin: 0 0 14px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 0.74rem;
  color: var(--teal);
  font-weight: 700;
}

.hero h1,
.section-heading h2,
.story-copy h2,
.cta-section h2 {
  font-family: "Source Serif 4", serif;
  line-height: 0.96;
  letter-spacing: -0.03em;
  margin: 0;
}

.hero h1 {
  font-size: clamp(3.6rem, 8vw, 6.8rem);
  max-width: 11ch;
}

.hero-text {
  color: var(--muted);
  max-width: 58ch;
  font-size: 1.08rem;
  line-height: 1.7;
  margin: 24px 0 0;
}

.hero-actions {
  display: flex;
  gap: 14px;
  margin-top: 28px;
}

.platform-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.platform-strip span,
.subject-cloud span,
.math-keys span {
  border-radius: 999px;
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.56);
  border: 1px solid rgba(29, 36, 51, 0.08);
}

.platform-strip span {
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease;
}

.platform-strip span.is-live {
  transform: translateY(-2px);
  background: rgba(58, 141, 138, 0.14);
  border-color: rgba(58, 141, 138, 0.3);
}

.hero-card {
  position: relative;
}

.hero-card::after {
  content: "";
  position: absolute;
  inset: auto -20px -24px 20px;
  height: 46%;
  border-radius: 40px;
  background: linear-gradient(135deg, rgba(235, 107, 88, 0.22), rgba(58, 141, 138, 0.2));
  filter: blur(20px);
  z-index: -1;
}

.solver-window,
.feature-card,
.story-panel,
.price-card,
.cta-section,
.stats-band,
.workflow-grid article {
  background: var(--surface);
  backdrop-filter: blur(18px);
  border: 1px solid rgba(255, 255, 255, 0.55);
  box-shadow: var(--shadow);
}

.solver-window {
  border-radius: var(--radius-xl);
  padding: 20px;
}

.solver-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--muted);
  font-size: 0.92rem;
  margin-bottom: 22px;
}

.solver-dots {
  display: flex;
  gap: 8px;
}

.solver-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(29, 36, 51, 0.18);
}

.solver-input {
  padding: 18px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.62);
}

.solver-input label,
.step-index,
.workflow-number,
.badge {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.72rem;
  font-weight: 700;
}

.input-row {
  display: flex;
  gap: 12px;
  margin-top: 10px;
}

.input-row input,
.cta-form input {
  flex: 1;
  min-width: 0;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(255, 250, 241, 0.85);
  padding: 15px 16px;
  font: inherit;
  color: var(--ink);
}

.math-keys {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
  color: var(--muted);
}

.solver-steps {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.step-card {
  padding: 16px 18px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.56);
  border: 1px solid rgba(29, 36, 51, 0.08);
  opacity: 0.7;
  transform: translateX(0);
  transition: transform 220ms ease, opacity 220ms ease, background 220ms ease;
}

.step-card.is-active,
.step-card:hover {
  opacity: 1;
  transform: translateX(6px);
  background: rgba(255, 255, 255, 0.92);
}

.step-card p,
.feature-card p,
.workflow-grid p,
.price-card p,
.story-copy p,
.quote-card span,
.stats-band p {
  color: var(--muted);
  line-height: 1.7;
}

.step-card strong,
.price-tag,
.feature-card h3,
.workflow-grid h3 {
  font-size: 1.12rem;
}

.text-link {
  display: inline-block;
  margin-top: 12px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
}

.step-answer {
  background: linear-gradient(135deg, rgba(58, 141, 138, 0.16), rgba(181, 208, 186, 0.34));
}

.stats-band {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  border-radius: var(--radius-xl);
  padding: 22px;
}

.stats-band article {
  padding: 8px;
}

.stats-band strong {
  display: block;
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.section-grid,
.subject-section,
.workflow-section,
.pricing-section {
  padding: 110px 0 0;
}

.page-hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 24px;
  align-items: stretch;
  padding: 48px 0 16px;
}

.page-hero h1 {
  font-family: "Source Serif 4", serif;
  font-size: clamp(3rem, 6vw, 5.4rem);
  line-height: 0.98;
  letter-spacing: -0.03em;
  margin: 0;
  max-width: 11ch;
}

.page-hero-card,
.detail-card,
.table-panel {
  background: var(--surface);
  backdrop-filter: blur(18px);
  border: 1px solid rgba(255, 255, 255, 0.55);
  box-shadow: var(--shadow);
}

.page-hero-card {
  border-radius: var(--radius-xl);
  padding: 24px;
  display: grid;
  gap: 16px;
  align-content: center;
}

.mini-stat {
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(29, 36, 51, 0.08);
  padding: 20px;
}

.mini-stat strong,
.table-row strong {
  display: block;
  font-size: 1.08rem;
  margin-bottom: 8px;
}

.mini-stat p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.content-grid,
.stacked-details {
  display: grid;
  gap: 20px;
  padding-top: 48px;
}

.content-grid {
  grid-template-columns: repeat(2, 1fr);
}

.detail-card {
  border-radius: var(--radius-lg);
  padding: 28px;
}

.detail-card h2 {
  font-family: "Source Serif 4", serif;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
  margin: 0 0 12px;
}

.detail-card p:last-child {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.7;
}

.table-panel {
  margin-top: 48px;
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.table-row {
  display: grid;
  grid-template-columns: 0.75fr 1.25fr;
  gap: 20px;
  padding: 24px 28px;
  border-top: 1px solid rgba(29, 36, 51, 0.08);
}

.table-row:first-child {
  border-top: 0;
}

.table-row span {
  color: var(--muted);
  line-height: 1.7;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 28px;
}

.section-heading h2,
.story-copy h2,
.cta-section h2 {
  font-size: clamp(2.4rem, 5vw, 4.2rem);
  max-width: 12ch;
}

.section-heading.narrow {
  justify-content: flex-start;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.feature-card,
.price-card,
.workflow-grid article {
  border-radius: var(--radius-lg);
  padding: 28px;
}

.accent-coral {
  box-shadow: inset 0 0 0 1px rgba(235, 107, 88, 0.22), var(--shadow);
}

.accent-gold {
  box-shadow: inset 0 0 0 1px rgba(242, 184, 75, 0.28), var(--shadow);
}

.accent-teal {
  box-shadow: inset 0 0 0 1px rgba(58, 141, 138, 0.24), var(--shadow);
}

.accent-ink {
  box-shadow: inset 0 0 0 1px rgba(29, 36, 51, 0.14), var(--shadow);
}

.subject-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.subject-cloud span {
  padding: 16px 20px;
  font-size: 1rem;
}

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

.workflow-number,
.badge {
  color: var(--coral);
}

.story-panel {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 28px;
  margin-top: 110px;
  border-radius: var(--radius-xl);
  padding: 34px;
}

.quote-card {
  background: linear-gradient(145deg, rgba(29, 36, 51, 0.94), rgba(43, 55, 78, 0.92));
  color: white;
  border-radius: 28px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.quote-card p {
  font-family: "Source Serif 4", serif;
  font-size: 1.65rem;
  line-height: 1.2;
  margin: 0 0 18px;
}

.quote-card span {
  color: rgba(255, 255, 255, 0.72);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.price-card {
  position: relative;
}

.price-card ul {
  list-style: none;
  padding: 0;
  margin: 22px 0 0;
}

.price-card li {
  padding: 10px 0;
  border-top: 1px solid rgba(29, 36, 51, 0.08);
  color: var(--muted);
}

.price-tag {
  font-size: 2.7rem;
  margin: 8px 0 4px;
}

.price-tag span {
  font-size: 1rem;
  color: var(--muted);
  margin-left: 6px;
}

.featured {
  background: linear-gradient(145deg, rgba(255, 247, 233, 0.92), rgba(255, 255, 255, 0.8));
}

.badge {
  display: inline-block;
  margin-bottom: 10px;
}

.cta-section {
  margin: 110px 0 60px;
  padding: 34px;
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.cta-form {
  display: flex;
  gap: 12px;
  flex: 0 0 min(470px, 100%);
}

.payment-panel {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 20px;
  margin-top: 48px;
}

.payment-panel-home {
  margin-top: 32px;
  margin-bottom: 24px;
}

.payment-copy,
.payment-card {
  background: var(--surface);
  backdrop-filter: blur(18px);
  border: 1px solid rgba(255, 255, 255, 0.55);
  box-shadow: var(--shadow);
  border-radius: var(--radius-xl);
  padding: 28px;
}

.payment-copy h2 {
  font-family: "Source Serif 4", serif;
  font-size: clamp(2rem, 4.5vw, 3.5rem);
  line-height: 1;
  letter-spacing: -0.03em;
  margin: 0 0 14px;
  max-width: 12ch;
}

.payment-copy p:last-child,
.payment-card p,
.payment-note {
  color: var(--muted);
  line-height: 1.7;
}

.payment-card {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 14px;
}

.payment-card strong {
  font-size: 1.15rem;
}

.payment-card p {
  margin: 0;
}

.payment-actions {
  margin-top: 22px;
}

.paypal-button {
  background: linear-gradient(135deg, #0a2540, #0070ba);
}

.payment-note {
  margin: 12px 0 0;
}

.payment-note a,
.payment-copy a {
  color: var(--ink);
}

.cta-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 0 0 40px;
}

.site-footer p,
.footer-links a {
  color: var(--muted);
  text-decoration: none;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

@media (max-width: 980px) {
  .topbar,
  .hero,
  .page-hero,
  .stats-band,
  .feature-grid,
  .workflow-grid,
  .story-panel,
  .pricing-grid,
  .content-grid,
  .payment-panel,
  .cta-section {
    grid-template-columns: 1fr;
  }

  .topbar,
  .cta-section {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav {
    flex-wrap: wrap;
    gap: 14px 18px;
  }

  .hero {
    min-height: auto;
    padding-top: 18px;
  }

  .section-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .table-row,
  .site-footer {
    grid-template-columns: 1fr;
    flex-direction: column;
    align-items: flex-start;
  }

  .cta-form {
    width: 100%;
    flex-direction: column;
  }
}

@media (max-width: 680px) {
  .site-shell {
    width: min(calc(100% - 24px), var(--max));
  }

  .topbar {
    padding-top: 16px;
  }

  .nav {
    display: none;
  }

  .hero h1 {
    font-size: clamp(2.9rem, 16vw, 4.6rem);
  }

  .hero-actions,
  .input-row,
  .cta-actions {
    flex-direction: column;
  }

  .solver-window,
  .feature-card,
  .price-card,
  .cta-section,
  .story-panel,
  .workflow-grid article,
  .stats-band {
    padding: 20px;
  }

  .subject-cloud span,
  .platform-strip span,
  .math-keys span {
    width: 100%;
    text-align: center;
  }
}