:root {
  --blue: #1457ff;
  --blue-dark: #0c2f95;
  --yellow: #ffd927;
  --black: #050505;
  --white: #ffffff;
  --red: #ff4b3e;
  --green: #21c55d;
  --border: 3px solid var(--black);
  --shadow: 7px 7px 0 var(--black);
  --radius: 22px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--blue);
  color: var(--black);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

button,
input {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
  outline: 4px solid var(--yellow);
  outline-offset: 4px;
}

.skip-link {
  position: absolute;
  top: -80px;
  left: 16px;
  z-index: 100;
  padding: 12px 16px;
  background: var(--yellow);
  color: var(--black);
  border: var(--border);
  font-weight: 800;
}

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

.shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  position: relative;
  min-height: 620px;
  display: grid;
  align-items: center;
  overflow: hidden;
  background: var(--blue);
  color: var(--white);
  border-bottom: var(--border);
}

.hero__content {
  position: relative;
  z-index: 2;
  padding: 96px 0;
}

.hero h1 {
  max-width: 850px;
  margin: 0;
  font-size: clamp(3.25rem, 9vw, 7.8rem);
  line-height: 0.9;
  letter-spacing: -0.075em;
}

.hero__headline {
  max-width: 760px;
  margin: 28px 0 12px;
  font-size: clamp(1.6rem, 3vw, 2.8rem);
  font-weight: 900;
  line-height: 1.05;
}

.hero__copy {
  max-width: 670px;
  margin: 0 0 32px;
  font-size: 1.12rem;
}

.hero__ripples {
  position: absolute;
  width: min(58vw, 760px);
  aspect-ratio: 1;
  right: -12vw;
  top: 50%;
  transform: translateY(-50%);
  opacity: 0.28;
}

.hero__ripples span {
  position: absolute;
  inset: 0;
  border: 18px solid var(--white);
  border-radius: 50%;
}

.hero__ripples span:nth-child(2) {
  inset: 16%;
}

.hero__ripples span:nth-child(3) {
  inset: 32%;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  font-size: 0.82rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 4px;
  background: currentColor;
}

.eyebrow--blue {
  color: var(--blue);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 12px 20px;
  border: var(--border);
  border-radius: 14px;
  box-shadow: 4px 4px 0 var(--black);
  color: var(--black);
  font-weight: 900;
  text-decoration: none;
  cursor: pointer;
  transition: transform 140ms ease, box-shadow 140ms ease;
}

.button:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--black);
}

.button--yellow {
  background: var(--yellow);
}

.button--black {
  background: var(--black);
  color: var(--white);
}

.button--blue {
  background: var(--blue);
  color: var(--white);
}

.button--white {
  background: var(--white);
}

.button--small {
  min-height: 44px;
  padding: 9px 14px;
  font-size: 0.92rem;
}

.text-button {
  border: 0;
  padding: 4px;
  background: transparent;
  color: var(--blue);
  font-weight: 900;
  text-decoration: underline;
  cursor: pointer;
}

.section {
  padding: 92px 0;
}

.section--blue {
  background: var(--blue);
  color: var(--white);
}

.section--white {
  background: var(--white);
}

.section--yellow {
  background: var(--yellow);
  border-top: var(--border);
}

.section-heading {
  max-width: 790px;
  margin-bottom: 40px;
}

.section-heading h2 {
  margin: 0 0 12px;
  font-size: clamp(2.25rem, 5vw, 4.6rem);
  line-height: 0.98;
  letter-spacing: -0.055em;
}

.section-heading p {
  margin: 0;
  font-size: 1.08rem;
}

.section-heading--light {
  color: var(--white);
}

.simulator-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 26px;
  align-items: start;
}

.panel {
  background: var(--white);
  color: var(--black);
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px;
}

.panel__heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

.panel__heading h3 {
  margin: 0;
  font-size: 1.7rem;
  line-height: 1.1;
}

.panel__kicker {
  margin: 0 0 4px;
  color: var(--blue);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.control-list {
  display: grid;
  gap: 22px;
}

.control-group {
  padding-bottom: 20px;
  border-bottom: 2px solid var(--black);
}

.control-group:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.control-heading {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: baseline;
}

.control-heading label {
  font-weight: 900;
}

.control-value {
  flex: 0 0 auto;
  padding: 4px 9px;
  background: var(--yellow);
  border: 2px solid var(--black);
  border-radius: 999px;
  font-weight: 900;
}

.helper {
  margin: 6px 0 12px;
  color: #353535;
  font-size: 0.9rem;
}

.control-inputs {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 118px;
  gap: 14px;
  align-items: center;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--blue);
  cursor: pointer;
}

input[type="number"] {
  width: 100%;
  min-width: 0;
  padding: 10px 12px;
  border: 2px solid var(--black);
  border-radius: 10px;
  background: var(--white);
  color: var(--black);
  font-weight: 800;
}

.number-with-suffix,
.number-with-prefix {
  display: flex;
  align-items: center;
  border: 2px solid var(--black);
  border-radius: 10px;
  overflow: hidden;
  background: var(--white);
}

.number-with-suffix input,
.number-with-prefix input {
  border: 0;
  border-radius: 0;
}

.number-with-suffix span,
.number-with-prefix span {
  padding: 0 10px;
  font-weight: 900;
}

.funnel {
  display: grid;
  justify-items: center;
}

.funnel-stage {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  padding: 16px 20px;
  border: var(--border);
  border-radius: 16px;
  text-align: center;
  background: var(--blue);
  color: var(--white);
  transition: transform 180ms ease, background 180ms ease;
}

.funnel-stage--1 { width: 100%; }
.funnel-stage--2 { width: 88%; }
.funnel-stage--3 { width: 76%; }
.funnel-stage--4 { width: 64%; }
.funnel-stage--5 {
  width: 58%;
  background: var(--yellow);
  color: var(--black);
}

.funnel-stage__label {
  font-size: 0.84rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.funnel-stage strong {
  font-size: clamp(1.55rem, 3vw, 2.35rem);
  line-height: 1.1;
}

.funnel-connector {
  position: relative;
  padding: 12px 0;
  font-size: 0.86rem;
  font-weight: 900;
}

.funnel-connector::before {
  content: "↓";
  margin-right: 6px;
  color: var(--blue);
}

.funnel-stage.is-rippling {
  transform: scale(1.025);
  background: var(--green);
  color: var(--black);
}

.funnel-stage--5.is-rippling {
  background: var(--red);
  color: var(--white);
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 30px;
}

.result-card {
  min-width: 0;
  padding: 20px;
  background: var(--white);
  color: var(--black);
  border: var(--border);
  border-radius: 18px;
  box-shadow: 5px 5px 0 var(--black);
}

.result-card--yellow {
  background: var(--yellow);
}

.result-card span {
  display: block;
  margin-bottom: 6px;
  font-size: 0.86rem;
  font-weight: 800;
}

.result-card strong {
  display: block;
  overflow-wrap: anywhere;
  font-size: clamp(1.7rem, 3vw, 2.6rem);
  line-height: 1;
}

.micro-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  margin-top: 28px;
  overflow: hidden;
  border: var(--border);
  border-radius: 16px;
  background: var(--black);
}

.micro-metrics div {
  padding: 18px;
  background: var(--white);
  color: var(--black);
}

.micro-metrics span,
.micro-metrics strong {
  display: block;
}

.micro-metrics span {
  font-size: 0.84rem;
  font-weight: 700;
}

.micro-metrics strong {
  margin-top: 4px;
  font-size: 1.5rem;
}

.insight-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 28px;
}

.insight-card {
  min-height: 190px;
  padding: 24px;
  color: var(--black);
  border: var(--border);
  border-radius: 20px;
  box-shadow: 5px 5px 0 var(--black);
}

.insight-card--yellow {
  background: var(--yellow);
}

.insight-card--white {
  background: var(--white);
}

.insight-card__label {
  margin: 0 0 8px;
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.insight-card h3 {
  margin: 0 0 8px;
  font-size: 1.6rem;
}

.insight-card p:last-child {
  margin-bottom: 0;
}

.baseline-panel {
  margin-top: 28px;
}

.comparison-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.comparison-item {
  padding: 16px;
  border: 2px solid var(--black);
  border-radius: 14px;
  background: var(--white);
}

.comparison-item span {
  display: block;
  font-size: 0.82rem;
  font-weight: 800;
}

.comparison-item strong {
  display: block;
  margin-top: 6px;
  font-size: 1.35rem;
  overflow-wrap: anywhere;
}

.comparison-item[data-direction="up"] strong::before {
  content: "↑ ";
}

.comparison-item[data-direction="down"] strong::before {
  content: "↓ ";
}

.comparison-item[data-direction="same"] strong::before {
  content: "→ ";
}

.disclaimer {
  max-width: 830px;
  margin: 24px auto 0;
  color: var(--white);
  text-align: center;
  font-size: 0.86rem;
}

.experiment-options {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.experiment-button {
  min-height: 150px;
  padding: 20px;
  background: var(--yellow);
  border: var(--border);
  border-radius: 18px;
  box-shadow: 5px 5px 0 var(--black);
  color: var(--black);
  text-align: left;
  cursor: pointer;
  transition: transform 140ms ease, box-shadow 140ms ease;
}

.experiment-button:hover {
  transform: translate(2px, 2px);
  box-shadow: 3px 3px 0 var(--black);
}

.experiment-button strong,
.experiment-button span {
  display: block;
}

.experiment-button strong {
  margin-bottom: 8px;
  font-size: 2rem;
}

.experiment-button span {
  font-weight: 900;
}

.experiment-result {
  margin-top: 28px;
  padding: 26px;
  border: var(--border);
  border-radius: var(--radius);
  background: var(--blue);
  color: var(--white);
  box-shadow: var(--shadow);
}

.experiment-result .comparison-item {
  color: var(--black);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.lesson-flow {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 30px;
  padding: 20px;
  background: var(--white);
  border: var(--border);
  border-radius: 18px;
  box-shadow: 5px 5px 0 var(--black);
  font-weight: 900;
}

.lesson-flow span {
  text-align: center;
}

.lesson-flow b {
  color: var(--blue);
  font-size: 1.4rem;
}

.lesson-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.lesson-grid article {
  padding: 20px;
  background: var(--white);
  border: var(--border);
  border-radius: 18px;
}

.lesson-grid article > span {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  background: var(--blue);
  color: var(--white);
  border: 2px solid var(--black);
  border-radius: 50%;
  font-weight: 900;
}

.lesson-grid h3 {
  margin: 14px 0 8px;
}

.lesson-grid p {
  margin: 0;
  font-size: 0.94rem;
}

footer {
  padding: 30px 0;
  background: var(--black);
  color: var(--white);
  text-align: center;
  font-weight: 800;
}

footer p {
  margin: 0;
}

.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

[hidden] {
  display: none !important;
}

@media (max-width: 980px) {
  .simulator-grid,
  .insight-grid {
    grid-template-columns: 1fr;
  }

  .result-grid,
  .comparison-grid,
  .experiment-options {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .lesson-grid article:last-child {
    grid-column: span 2;
  }
}

@media (max-width: 700px) {
  .hero {
    min-height: 560px;
  }

  .hero__content {
    padding: 72px 0;
  }

  .hero__ripples {
    width: 620px;
    right: -360px;
  }

  .section {
    padding: 68px 0;
  }

  .panel {
    padding: 20px;
    box-shadow: 5px 5px 0 var(--black);
  }

  .panel__heading {
    flex-direction: column;
  }

  .control-inputs {
    grid-template-columns: 1fr;
  }

  .result-grid,
  .comparison-grid,
  .experiment-options,
  .micro-metrics,
  .lesson-grid {
    grid-template-columns: 1fr;
  }

  .lesson-grid article:last-child {
    grid-column: auto;
  }

  .micro-metrics {
    gap: 2px;
  }

  .lesson-flow {
    flex-direction: column;
  }

  .lesson-flow b {
    transform: rotate(90deg);
  }

  .funnel-stage--1 { width: 100%; }
  .funnel-stage--2 { width: 94%; }
  .funnel-stage--3 { width: 88%; }
  .funnel-stage--4 { width: 82%; }
  .funnel-stage--5 { width: 76%; }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}