/* Kong landing — Duolingo-inspired design tokens */
:root {
  --duo-green: #58CC02;
  --duo-green-light: #61E002;
  --duo-green-dark: #46A302;
  --duo-green-shadow: #58A700;
  --ink: #3C3C3C;
  --ink-strong: #4B4B4B;
  --muted: #777777;
  --muted-light: #AFAFAF;
  --canvas: #FFFFFF;
  --wash-blue: #DDF4FF;
  --surface: #FFFFFF;
  --surface-alt: #F7F7F7;
  --border: #E5E5E5;
  --border-strong: #DADADA;
  --link-blue: #1CB0F6;
  --link-blue-dark: #1B99D6;
  --navy: #042C60;
  --super-navy: #100F3E;
  --super-ink: #000437;
  --footer-soft: #D7FFB8;
  --warning: #FFC800;
  --error: #FF4B4B;
  --streak: #FF9600;
  --gems: #CE82FF;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-pill: 999px;
  --max: 988px;
  --wide: 1090px;
  --section-pad: 96px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Nunito", system-ui, sans-serif;
  font-size: 17px;
  font-weight: 500;
  line-height: 1.41;
  color: var(--muted);
  background: var(--canvas);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--link-blue);
  text-decoration: none;
}

a:hover {
  color: var(--link-blue-dark);
}

:focus-visible {
  outline: 3px solid var(--link-blue);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 200;
  padding: 12px 20px;
  background: var(--duo-green);
  color: #fff;
  font-weight: 700;
  border-radius: var(--radius-md);
}

.skip-link:focus {
  top: 16px;
}

.container {
  width: min(100% - 32px, var(--max));
  margin-inline: auto;
}

.container--wide {
  width: min(100% - 32px, var(--wide));
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--canvas);
  border-bottom: 1px solid var(--border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: "Fredoka", "Nunito", sans-serif;
  font-size: 20px;
  font-weight: 700;
  color: var(--ink-strong);
  text-decoration: none;
}

.site-logo:hover {
  color: var(--ink-strong);
}

.site-logo__mark {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--duo-green);
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 18px;
  font-weight: 800;
}

.site-header__cta {
  flex-shrink: 0;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 50px;
  padding: 0 24px;
  border: none;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.1s ease, background 0.15s ease, box-shadow 0.1s ease;
}

.btn--primary {
  background: var(--duo-green);
  color: #fff;
  box-shadow: 0 4px 0 var(--duo-green-shadow);
}

.btn--primary:hover {
  background: var(--duo-green-light);
  color: #fff;
  transform: translateY(-1px);
}

.btn--primary:active {
  background: var(--duo-green-dark);
  transform: translateY(4px);
  box-shadow: none;
}

.btn--secondary {
  background: var(--surface);
  color: var(--link-blue);
  border: 2px solid var(--border);
  box-shadow: 0 4px 0 var(--border-strong);
}

.btn--secondary:hover {
  background: var(--wash-blue);
  color: var(--link-blue-dark);
  border-color: var(--link-blue);
}

.btn--secondary:active {
  transform: translateY(4px);
  box-shadow: none;
}

.btn--super {
  background: #fff;
  color: var(--super-ink);
  box-shadow: 0 4px 0 rgba(255, 255, 255, 0.25);
}

.btn--super:hover {
  background: var(--wash-blue);
  color: var(--super-ink);
}

.btn--super:active {
  transform: translateY(4px);
  box-shadow: none;
}

.btn--block {
  width: 100%;
  max-width: 330px;
}

/* Hero */
.hero {
  padding: 48px 0 64px;
  overflow: hidden;
}

.hero__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.hero__visual {
  position: relative;
  min-height: 380px;
}

.hero-illustration {
  position: relative;
  width: 100%;
  max-width: 424px;
  margin-inline: auto;
}

.hero-illustration__hub {
  width: 200px;
  height: 200px;
  margin: 40px auto;
  border-radius: 50%;
  background: linear-gradient(145deg, var(--duo-green) 0%, var(--duo-green-dark) 100%);
  display: grid;
  place-items: center;
  box-shadow: 0 8px 0 var(--duo-green-shadow), 0 24px 48px rgba(88, 204, 2, 0.25);
  animation: float 4s ease-in-out infinite;
}

.hero-illustration__hub svg {
  width: 100px;
  height: 100px;
}

.hero-illustration__node {
  position: absolute;
  width: 72px;
  height: 72px;
  border-radius: var(--radius-lg);
  display: grid;
  place-items: center;
  font-size: 28px;
  box-shadow: 0 4px 0 rgba(0, 0, 0, 0.08);
  animation: float 3s ease-in-out infinite;
}

.hero-illustration__node--api {
  top: 20px;
  left: 10px;
  background: var(--wash-blue);
  animation-delay: 0.3s;
}

.hero-illustration__node--ai {
  top: 10px;
  right: 20px;
  background: #FFF0D6;
  animation-delay: 0.6s;
}

.hero-illustration__node--event {
  bottom: 30px;
  left: 0;
  background: #F0E6FF;
  animation-delay: 0.9s;
}

.hero-illustration__node--agent {
  bottom: 20px;
  right: 10px;
  background: #E8FFE0;
  animation-delay: 1.2s;
}

.hero-illustration__line {
  position: absolute;
  height: 3px;
  background: var(--border);
  border-radius: 2px;
  transform-origin: left center;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.hero__content {
  text-align: left;
}

.hero__eyebrow {
  display: inline-block;
  margin-bottom: 12px;
  padding: 6px 14px;
  background: var(--wash-blue);
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--navy);
}

.hero__title {
  margin: 0 0 8px;
  font-family: "Fredoka", "Nunito", sans-serif;
  font-size: clamp(56px, 10vw, 80px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--duo-green);
}

.hero__subtitle {
  margin: 0 0 20px;
  font-family: "Fredoka", "Nunito", sans-serif;
  font-size: clamp(22px, 4vw, 32px);
  font-weight: 700;
  line-height: 1.25;
  color: var(--ink-strong);
}

.hero__desc {
  margin: 0 0 28px;
  max-width: 473px;
  font-size: 17px;
  line-height: 24px;
  color: var(--muted);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 28px;
}

.hero__bullets {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.hero__bullets li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.hero__bullets li::before {
  content: "✓";
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--duo-green);
  color: #fff;
  font-size: 13px;
  font-weight: 800;
  display: grid;
  place-items: center;
}

/* Capability rail */
.capability-rail {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
  background: var(--surface-alt);
}

.capability-rail__inner {
  display: flex;
  align-items: center;
  gap: 16px;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.capability-rail__inner::-webkit-scrollbar {
  display: none;
}

.capability-rail__label {
  flex-shrink: 0;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted-light);
}

.capability-chip {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.capability-chip__icon {
  font-size: 20px;
}

/* Comparison section */
.comparison {
  padding: var(--section-pad) 0;
}

.comparison__heading {
  margin: 0 0 48px;
  text-align: center;
  font-family: "Fredoka", "Nunito", sans-serif;
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  line-height: 1.15;
  color: var(--duo-green);
}

.comparison__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.comparison-card {
  padding: 32px;
  border-radius: var(--radius-xl);
  border: 2px solid var(--border);
}

.comparison-card--without {
  background: var(--surface-alt);
}

.comparison-card--with {
  background: var(--wash-blue);
  border-color: var(--link-blue);
}

.comparison-card__title {
  margin: 0 0 20px;
  font-family: "Fredoka", "Nunito", sans-serif;
  font-size: 24px;
  font-weight: 700;
  color: var(--ink-strong);
}

.comparison-card__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.comparison-card__list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.4;
}

.comparison-card--without .comparison-card__list li::before {
  content: "✕";
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--error);
  color: #fff;
  font-size: 12px;
  font-weight: 800;
  display: grid;
  place-items: center;
}

.comparison-card--with .comparison-card__list li::before {
  content: "✓";
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--duo-green);
  color: #fff;
  font-size: 13px;
  font-weight: 800;
  display: grid;
  place-items: center;
}

/* Feature sections */
.feature {
  padding: var(--section-pad) 0;
}

.feature--alt {
  background: var(--surface-alt);
}

.feature__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.feature--reverse .feature__grid {
  direction: rtl;
}

.feature--reverse .feature__grid > * {
  direction: ltr;
}

.feature__title {
  margin: 0 0 16px;
  font-family: "Fredoka", "Nunito", sans-serif;
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--duo-green);
}

.feature__text {
  margin: 0 0 24px;
  max-width: 473px;
  font-size: 17px;
  line-height: 24px;
}

.feature__list {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.feature__list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: var(--ink);
}

.feature__list li::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--duo-green);
  flex-shrink: 0;
}

.feature-visual {
  display: flex;
  justify-content: center;
}

.feature-card {
  width: 100%;
  max-width: 420px;
  padding: 28px;
  background: var(--surface);
  border-radius: var(--radius-xl);
  border: 2px solid var(--border);
  box-shadow: 0 8px 0 var(--border-strong);
}

.feature-card__header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.feature-card__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: grid;
  place-items: center;
  font-size: 24px;
}

.feature-card__icon--green { background: #E8FFE0; }
.feature-card__icon--blue { background: var(--wash-blue); }
.feature-card__icon--yellow { background: #FFF8E0; }
.feature-card__icon--purple { background: #F0E6FF; }

.feature-card__label {
  font-size: 14px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted-light);
}

.feature-card__title {
  margin: 0;
  font-family: "Fredoka", "Nunito", sans-serif;
  font-size: 20px;
  font-weight: 700;
  color: var(--ink-strong);
}

.feature-card__progress {
  height: 12px;
  background: var(--border);
  border-radius: var(--radius-pill);
  overflow: hidden;
  margin-bottom: 16px;
}

.feature-card__progress-bar {
  height: 100%;
  border-radius: var(--radius-pill);
  background: var(--duo-green);
}

.feature-card__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.stat-pill {
  padding: 12px;
  background: var(--surface-alt);
  border-radius: var(--radius-md);
  text-align: center;
}

.stat-pill__value {
  display: block;
  font-family: "Fredoka", "Nunito", sans-serif;
  font-size: 22px;
  font-weight: 700;
  color: var(--ink-strong);
}

.stat-pill__label {
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted-light);
}

/* Trust section */
.trust {
  padding: var(--section-pad) 0;
  background: var(--wash-blue);
  text-align: center;
}

.trust__title {
  margin: 0 0 12px;
  font-family: "Fredoka", "Nunito", sans-serif;
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--navy);
}

.trust__subtitle {
  margin: 0 auto 48px;
  max-width: 600px;
  font-size: 17px;
  line-height: 24px;
}

.trust__logos {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
  margin-bottom: 40px;
}

.trust-badge {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 24px;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 800;
  color: var(--ink);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.trust-badge__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--duo-green);
}

.trust__quote {
  margin: 0 auto;
  max-width: 640px;
  padding: 32px;
  background: var(--surface);
  border-radius: var(--radius-xl);
  border: 2px solid var(--border);
  font-size: 18px;
  font-weight: 600;
  font-style: italic;
  color: var(--ink);
  line-height: 1.5;
}

/* Economy shift */
.economy {
  padding: var(--section-pad) 0;
}

.economy__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.economy-card {
  padding: 36px;
  border-radius: var(--radius-xl);
  text-align: center;
}

.economy-card--old {
  background: var(--surface-alt);
  border: 2px solid var(--border);
}

.economy-card--new {
  background: linear-gradient(160deg, var(--super-navy) 0%, #1a1960 100%);
  color: #fff;
}

.economy-card__label {
  display: inline-block;
  margin-bottom: 16px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.economy-card--old .economy-card__label {
  background: var(--border);
  color: var(--muted);
}

.economy-card--new .economy-card__label {
  background: rgba(255, 255, 255, 0.15);
  color: var(--footer-soft);
}

.economy-card__title {
  margin: 0 0 12px;
  font-family: "Fredoka", "Nunito", sans-serif;
  font-size: 28px;
  font-weight: 700;
  line-height: 1.2;
}

.economy-card--old .economy-card__title {
  color: var(--ink-strong);
}

.economy-card__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.5;
}

.economy-card--new .economy-card__text {
  color: rgba(255, 255, 255, 0.75);
}

/* Super promo block */
.super-promo {
  padding: 80px 0;
  background: var(--super-navy);
  color: #fff;
  text-align: center;
}

.super-promo__title {
  margin: 0 0 16px;
  font-family: "Fredoka", "Nunito", sans-serif;
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 700;
  line-height: 1.1;
  background: linear-gradient(90deg, #fff 0%, var(--footer-soft) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.super-promo__text {
  margin: 0 auto 32px;
  max-width: 560px;
  font-size: 18px;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.7);
}

.super-promo__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

/* Final CTA */
.final-cta {
  position: relative;
  padding: 80px 0 120px;
  text-align: center;
  overflow: hidden;
}

.final-cta__hills {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 80px;
  background: var(--duo-green);
  clip-path: ellipse(60% 100% at 50% 100%);
}

.final-cta__content {
  position: relative;
  z-index: 1;
}

.final-cta__title {
  margin: 0 0 16px;
  font-family: "Fredoka", "Nunito", sans-serif;
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--duo-green);
}

.final-cta__text {
  margin: 0 auto 32px;
  max-width: 520px;
  font-size: 18px;
  line-height: 1.5;
}

.final-cta__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

/* Footer */
.site-footer {
  background: var(--duo-green);
  color: #fff;
  padding: 48px 0 32px;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.site-footer__brand {
  font-family: "Fredoka", "Nunito", sans-serif;
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 12px;
}

.site-footer__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.5;
  color: var(--footer-soft);
  max-width: 320px;
}

.site-footer__heading {
  margin: 0 0 16px;
  font-size: 14px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.site-footer__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.site-footer__links a {
  color: var(--footer-soft);
  font-size: 15px;
  font-weight: 600;
}

.site-footer__links a:hover {
  color: #fff;
}

.site-footer__bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  font-size: 13px;
  color: var(--footer-soft);
}

.site-footer__bottom a {
  color: var(--footer-soft);
}

.site-footer__bottom a:hover {
  color: #fff;
}

/* Responsive */
@media (max-width: 900px) {
  :root {
    --section-pad: 64px;
  }

  .hero__grid,
  .feature__grid,
  .comparison__grid,
  .economy__grid {
    grid-template-columns: 1fr;
  }

  .feature--reverse .feature__grid {
    direction: ltr;
  }

  .hero__visual {
    order: -1;
    min-height: 280px;
  }

  .hero__content {
    text-align: center;
  }

  .hero__desc {
    margin-inline: auto;
  }

  .hero__actions,
  .hero__bullets {
    align-items: center;
  }

  .hero__bullets li {
    text-align: left;
    max-width: 400px;
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .site-header__cta .btn {
    padding: 0 16px;
    font-size: 13px;
  }
}

@media (max-width: 480px) {
  .hero__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn--block {
    max-width: none;
  }

  .comparison-card,
  .feature-card,
  .economy-card {
    padding: 24px;
  }

  .trust__logos {
    flex-direction: column;
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}