:root {
  color-scheme: light;
  --ink: #121936;
  --muted: #59617d;
  --surface: #f7f8ff;
  --card: #ffffff;
  --line: #dfe3f4;
  --primary: #3559c7;
  --primary-dark: #243f99;
  --soft: #e8edff;
  --quiet: #8cf0cf;
  --shadow: 0 24px 70px rgba(30, 45, 105, 0.13);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    radial-gradient(circle at 88% 4%, rgba(140, 240, 207, 0.25), transparent 25rem),
    linear-gradient(180deg, #f9faff 0%, #f3f5ff 100%);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  min-height: 100vh;
}

a { color: inherit; }

.shell {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(223, 227, 244, 0.8);
  background: rgba(249, 250, 255, 0.9);
  backdrop-filter: blur(18px);
}

.nav {
  display: flex;
  min-height: 4.5rem;
  align-items: center;
  gap: 1.25rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-weight: 760;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 2.35rem;
  height: 2.35rem;
  place-items: center;
  border-radius: 0.8rem;
  background: var(--primary);
  color: white;
  box-shadow: 0 8px 18px rgba(53, 89, 199, 0.24);
}

.brand-mark svg { width: 1.45rem; height: 1.45rem; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  margin-left: auto;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 620;
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a:focus-visible { color: var(--primary); }

.button {
  display: inline-flex;
  min-height: 3rem;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.7rem 1.15rem;
  border: 1px solid transparent;
  border-radius: 0.9rem;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  transition: transform 150ms ease, background 150ms ease, box-shadow 150ms ease;
}

.button:hover,
.button:focus-visible {
  background: var(--primary-dark);
  box-shadow: 0 10px 26px rgba(53, 89, 199, 0.23);
  transform: translateY(-1px);
}

.button.secondary {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.75);
  color: var(--ink);
}

.button.secondary:hover,
.button.secondary:focus-visible { background: #fff; }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(18rem, 0.75fr);
  gap: clamp(2rem, 7vw, 6rem);
  align-items: center;
  padding: clamp(4.5rem, 10vw, 8.5rem) 0 5rem;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 1rem;
  color: var(--primary-dark);
  font-size: 0.84rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: #18a97d;
  content: "";
}

h1, h2, h3 { line-height: 1.12; letter-spacing: -0.035em; }

h1 {
  max-width: 12ch;
  margin: 0;
  font-size: clamp(3.1rem, 7vw, 6.25rem);
  font-weight: 820;
}

.hero-copy {
  max-width: 42rem;
  margin: 1.5rem 0 0;
  color: var(--muted);
  font-size: clamp(1.08rem, 2vw, 1.3rem);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

.signal-card {
  position: relative;
  overflow: hidden;
  padding: 1.5rem;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 2rem;
  background: #17214a;
  color: #fff;
  box-shadow: var(--shadow);
}

.signal-card::after {
  position: absolute;
  right: -4rem;
  bottom: -5rem;
  width: 12rem;
  height: 12rem;
  border-radius: 50%;
  background: rgba(140, 240, 207, 0.18);
  content: "";
}

.mode-row {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.mode-icon {
  display: grid;
  width: 4rem;
  height: 4rem;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 1.3rem;
  background: var(--quiet);
  color: #102b2b;
}

.mode-icon svg { width: 2.2rem; height: 2.2rem; }
.mode-label { margin: 0; color: #b9c3ed; font-size: 0.88rem; }
.mode-title { margin: 0.1rem 0 0; font-size: 1.25rem; }

.class-now {
  margin-top: 1.5rem;
  padding: 1.1rem;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 1.15rem;
  background: rgba(255, 255, 255, 0.07);
}

.class-now small { color: #b9c3ed; }
.class-now strong { display: block; margin-top: 0.2rem; font-size: 1.12rem; }
.class-meta { display: flex; justify-content: space-between; gap: 1rem; margin-top: 1rem; color: #dce1fb; font-size: 0.9rem; }

.section { padding: clamp(3.5rem, 8vw, 6.5rem) 0; }
.section-heading { max-width: 43rem; margin-bottom: 2rem; }
.section-heading h2 { margin: 0; font-size: clamp(2rem, 4vw, 3.4rem); }
.section-heading p { margin: 1rem 0 0; color: var(--muted); font-size: 1.08rem; }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.feature {
  min-height: 13.5rem;
  padding: 1.4rem;
  border: 1px solid var(--line);
  border-radius: 1.4rem;
  background: rgba(255, 255, 255, 0.8);
}

.feature-number {
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 820;
  letter-spacing: 0.12em;
}

.feature h3 { margin: 1.2rem 0 0.55rem; font-size: 1.3rem; }
.feature p { margin: 0; color: var(--muted); }

.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
  counter-reset: steps;
}

.step {
  padding-top: 1rem;
  border-top: 2px solid var(--primary);
  counter-increment: steps;
}

.step::before {
  color: var(--primary);
  content: "0" counter(steps);
  font-weight: 800;
}

.step h3 { margin: 0.7rem 0 0.45rem; }
.step p { margin: 0; color: var(--muted); }

.privacy-note {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 2rem;
  align-items: center;
  padding: clamp(1.7rem, 5vw, 3rem);
  border-radius: 1.8rem;
  background: var(--soft);
}

.privacy-note h2 { margin: 0; font-size: clamp(1.75rem, 4vw, 2.7rem); }
.privacy-note p { max-width: 44rem; margin: 0.7rem 0 0; color: var(--muted); }

.document {
  width: min(800px, calc(100% - 2rem));
  margin: 0 auto;
  padding: clamp(3.5rem, 8vw, 6rem) 0;
}

.document h1 { max-width: none; font-size: clamp(2.6rem, 7vw, 4.8rem); }
.document .lede { margin: 1rem 0 2.5rem; color: var(--muted); font-size: 1.1rem; }
.document article {
  padding: clamp(1.4rem, 5vw, 3rem);
  border: 1px solid var(--line);
  border-radius: 1.5rem;
  background: rgba(255, 255, 255, 0.84);
}

.document h2 { margin: 2.2rem 0 0.7rem; font-size: 1.45rem; }
.document h2:first-child { margin-top: 0; }
.document p, .document li { color: #3e4663; }
.document ul { padding-left: 1.25rem; }

.site-footer {
  margin-top: 2rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.footer-inner {
  display: flex;
  min-height: 8rem;
  align-items: center;
  gap: 1rem;
}

.footer-links { display: flex; flex-wrap: wrap; gap: 1rem; margin-left: auto; }
.footer-links a { font-weight: 620; text-decoration: none; }
.footer-links a:hover, .footer-links a:focus-visible { color: var(--primary); }

:focus-visible { outline: 3px solid rgba(53, 89, 199, 0.38); outline-offset: 3px; }

@media (max-width: 800px) {
  .nav-links a:not(.button) { display: none; }
  .hero { grid-template-columns: 1fr; padding-top: 4rem; }
  .signal-card { max-width: 32rem; }
  .feature-grid, .steps { grid-template-columns: 1fr; }
  .feature { min-height: auto; }
  .privacy-note { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .shell { width: min(100% - 1.25rem, 1120px); }
  .nav { min-height: 4rem; }
  .nav .button { min-height: 2.6rem; padding: 0.55rem 0.8rem; font-size: 0.86rem; }
  h1 { font-size: clamp(2.8rem, 15vw, 4.2rem); }
  .actions { flex-direction: column; }
  .actions .button { width: 100%; }
  .footer-inner { align-items: flex-start; flex-direction: column; padding: 2rem 0; }
  .footer-links { margin-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}