:root {
  --color-ink: #122033;
  --color-muted: #647187;
  --color-line: #dce4ee;
  --color-primary: #3156d8;
  --color-primary-dark: #2341ad;
  --color-accent: #32d5c8;
  --color-accent-soft: #e5fbf8;
  --color-surface: #ffffff;
  --color-surface-soft: #f4f7fb;
  --color-navy: #0b1930;
  --color-success: #14866d;
  --color-danger: #b42318;
  --shadow-card: 0 18px 50px rgba(18, 32, 51, 0.09);
  --radius-small: 0.75rem;
  --radius-card: 1.25rem;
  --radius-section: 2rem;
  --content-width: 70rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--color-ink);
  background: var(--color-surface);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  line-height: 1.6;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
}

button,
input,
select {
  font: inherit;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.65rem 1rem;
  color: var(--color-surface);
  background: var(--color-primary);
  border-radius: var(--radius-small);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  display: flex;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  width: min(calc(100% - 2rem), var(--content-width));
  margin-inline: auto;
  padding-block: 1.25rem;
}

.brand {
  display: inline-flex;
  gap: 0.7rem;
  align-items: center;
  color: var(--color-ink);
  font-weight: 850;
  letter-spacing: -0.03em;
  text-decoration: none;
}

.brand::before {
  display: grid;
  width: 2.5rem;
  height: 2.5rem;
  color: var(--color-surface);
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-radius: 0.8rem;
  content: "IA";
  place-items: center;
  font-size: 0.8rem;
  letter-spacing: 0;
  box-shadow: 0 0.5rem 1.5rem rgba(49, 86, 216, 0.25);
}

.main-nav ul {
  display: flex;
  gap: 0.35rem;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.main-nav a {
  display: inline-flex;
  padding: 0.55rem 0.7rem;
  color: var(--color-muted);
  border-radius: 0.55rem;
  font-size: 0.83rem;
  font-weight: 700;
  text-decoration: none;
}

.main-nav a:hover {
  color: var(--color-primary);
  background: var(--color-surface-soft);
}

main {
  display: block;
}

.hero {
  width: min(calc(100% - 1.25rem), 76rem);
  margin-inline: auto;
  padding: clamp(3rem, 8vw, 6.5rem) clamp(1.5rem, 6vw, 5rem);
  color: var(--color-surface);
  overflow: hidden;
  background:
    radial-gradient(circle at 90% 15%, rgba(50, 213, 200, 0.22), transparent 25%),
    radial-gradient(circle at 5% 95%, rgba(49, 86, 216, 0.45), transparent 35%),
    var(--color-navy);
  border-radius: var(--radius-section);
}

.hero__content {
  display: grid;
  gap: clamp(2.5rem, 6vw, 5rem);
  align-items: center;
  max-width: var(--content-width);
  margin-inline: auto;
}

.eyebrow {
  display: flex;
  gap: 0.6rem;
  align-items: center;
  margin: 0 0 1rem;
  color: #8cf2e8;
  font-size: 0.76rem;
  font-weight: 850;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 0.5rem;
  height: 0.5rem;
  background: var(--color-accent);
  border-radius: 50%;
  content: "";
  box-shadow: 0 0 0 0.35rem rgba(50, 213, 200, 0.12);
}

.hero h1 {
  max-width: 13ch;
  margin: 0;
  font-size: clamp(2.65rem, 8vw, 5rem);
  line-height: 1;
  letter-spacing: -0.06em;
}

.hero__description {
  max-width: 40rem;
  margin: 1.5rem 0 0;
  color: #c8d4e4;
  font-size: clamp(1rem, 2vw, 1.12rem);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  margin-top: 1.75rem;
  padding-inline: 1.2rem;
  color: var(--color-navy);
  background: var(--color-accent);
  border-radius: var(--radius-small);
  font-weight: 800;
  text-decoration: none;
}

.button:hover {
  background: #74eee5;
}

.hero figure {
  margin: 0;
  padding: 0.65rem;
  color: #aebed2;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: var(--radius-card);
  backdrop-filter: blur(0.8rem);
}

.hero figure img {
  width: 100%;
  border-radius: 0.9rem;
}

.hero figcaption {
  padding: 0.75rem 0.4rem 0.25rem;
  font-size: 0.75rem;
  text-align: center;
}

.content-section {
  width: min(calc(100% - 2rem), var(--content-width));
  margin-inline: auto;
  padding-block: clamp(4rem, 10vw, 7rem);
}

.section-heading {
  max-width: 42rem;
  margin-bottom: 2.25rem;
}

.section-kicker {
  margin: 0 0 0.7rem;
  color: var(--color-primary);
  font-size: 0.72rem;
  font-weight: 850;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.content-section h2 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3.15rem);
  line-height: 1.08;
  letter-spacing: -0.045em;
}

.section-heading > p:last-child {
  margin: 1rem 0 0;
  color: var(--color-muted);
}

.step-grid,
.feature-grid {
  display: grid;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.step-grid {
  counter-reset: step;
}

.step-grid li,
.feature-card {
  padding: 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
}

.step-grid li {
  counter-increment: step;
}

.step-grid li::before {
  display: grid;
  width: 2.25rem;
  height: 2.25rem;
  color: var(--color-primary);
  background: #edf1ff;
  border-radius: 0.7rem;
  content: counter(step, decimal-leading-zero);
  place-items: center;
  font-size: 0.72rem;
  font-weight: 900;
}

.step-grid h3,
.feature-card h3 {
  margin: 1.5rem 0 0.45rem;
  font-size: 1.15rem;
}

.step-grid p,
.feature-card p {
  margin: 0;
  color: var(--color-muted);
}

.features-section {
  width: 100%;
  max-width: none;
  padding-inline: max(1rem, calc((100% - var(--content-width)) / 2));
  background: var(--color-surface-soft);
}

.feature-card {
  box-shadow: 0 0.8rem 2.2rem rgba(18, 32, 51, 0.045);
}

.feature-card::before {
  display: block;
  width: 2.8rem;
  height: 0.35rem;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: 999px;
  content: "";
}

.faq-list {
  display: grid;
  gap: 0.75rem;
}

.faq-list details {
  padding: 1rem 1.15rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-small);
}

.faq-list summary {
  cursor: pointer;
  font-weight: 750;
}

.faq-list details p {
  margin: 0.75rem 0 0;
  color: var(--color-muted);
}

.waitlist-section {
  width: min(calc(100% - 1.25rem), 76rem);
  margin-bottom: 1.25rem;
  padding-inline: clamp(1.5rem, 6vw, 5rem);
  color: var(--color-surface);
  background: var(--color-navy);
  border-radius: var(--radius-section);
}

.waitlist-layout {
  display: grid;
  gap: 2.5rem;
  max-width: var(--content-width);
  margin-inline: auto;
}

.waitlist-section .section-kicker {
  color: #8cf2e8;
}

.waitlist-section .section-heading {
  margin: 0;
}

.waitlist-section .section-heading > p:last-child {
  color: #b7c5d8;
}

.waitlist-form {
  display: grid;
  gap: 1rem;
  padding: 1.25rem;
  color: var(--color-ink);
  background: var(--color-surface);
  border-radius: var(--radius-card);
}

.form-privacy {
  margin: 0;
  padding: 0.7rem 0.8rem;
  color: var(--color-muted);
  background: var(--color-surface-soft);
  border-radius: 0.6rem;
  font-size: 0.75rem;
}

.form-field {
  display: grid;
  gap: 0.35rem;
  margin: 0;
}

.form-field label {
  font-size: 0.85rem;
  font-weight: 750;
}

.field-help {
  color: var(--color-muted);
  font-size: 0.75rem;
}

.form-field input,
.form-field select {
  width: 100%;
  min-height: 2.9rem;
  padding: 0.65rem 0.75rem;
  color: var(--color-ink);
  background: var(--color-surface);
  border: 1px solid #b7c2d0;
  border-radius: 0.6rem;
}

.form-field input:hover,
.form-field select:hover {
  border-color: #77869b;
}

.checkbox-field {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.8rem;
}

.checkbox-field label {
  display: flex;
  gap: 0.65rem;
  align-items: flex-start;
}

.checkbox-field input {
  width: 1.1rem;
  height: 1.1rem;
  margin: 0.15rem 0 0;
  accent-color: var(--color-primary);
}

.submit-button {
  min-height: 3rem;
  padding-inline: 1.2rem;
  color: var(--color-surface);
  background: var(--color-primary);
  border: 0;
  border-radius: var(--radius-small);
  cursor: pointer;
  font-weight: 800;
}

.submit-button:hover {
  background: var(--color-primary-dark);
}

.submit-button:disabled {
  cursor: wait;
  opacity: 0.7;
}

.form-status {
  margin: 0;
  padding: 0.8rem 0.9rem;
  border: 1px solid currentColor;
  border-radius: 0.65rem;
  font-size: 0.82rem;
  font-weight: 700;
}

.form-status[data-state="success"] {
  color: var(--color-success);
  background: #effaf6;
}

.form-status[data-state="error"] {
  color: var(--color-danger);
  background: #fff3f2;
}

.form-field input[aria-invalid="true"],
.form-field select[aria-invalid="true"] {
  border-color: var(--color-danger);
  box-shadow: 0 0 0 2px rgba(180, 35, 24, 0.12);
}

.site-footer {
  display: grid;
  gap: 0.8rem;
  width: min(calc(100% - 2rem), var(--content-width));
  margin-inline: auto;
  padding-block: 2.5rem;
  color: var(--color-muted);
  font-size: 0.85rem;
}

.site-footer p,
.site-footer address {
  margin: 0;
}

.site-footer address {
  font-style: normal;
}

.site-footer a {
  color: var(--color-primary);
  font-weight: 700;
}

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

@media (min-width: 48rem) {
  .step-grid,
  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .waitlist-layout {
    grid-template-columns: 0.8fr 1.2fr;
    align-items: start;
  }

  .site-footer {
    grid-template-columns: 1fr auto;
  }

  .site-footer address {
    grid-column: 1;
  }

  .site-footer > a {
    grid-row: 1;
    grid-column: 2;
  }
}

@media (min-width: 60rem) {
  .hero__content {
    grid-template-columns: 1.15fr 0.85fr;
  }
}

@media (max-width: 42rem) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .main-nav ul {
    justify-content: flex-start;
  }

  .main-nav a {
    padding-left: 0;
  }

  .button {
    width: 100%;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}