:root {
  --paper: #f4f1eb;
  --paper-light: #fbfaf7;
  --ink: #1c211f;
  --muted: #626965;
  --line: #d9d7d0;
  --accent: #344562;
  --accent-dark: #26344d;
  --accent-soft: #e6e9ef;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  scroll-behavior: smooth;
  background: var(--paper);
}

body {
  min-height: 100vh;
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system,
    BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.55;
}

a {
  color: inherit;
}

.page-width {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
}

.hero {
  padding: 38px 0 78px;
  border-bottom: 1px solid var(--line);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.42fr) minmax(320px, 0.58fr);
  gap: clamp(48px, 6vw, 82px);
  align-items: end;
}

.eyebrow,
.invite-label,
.section-kicker,
.experience-label,
.card-index {
  margin: 0;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.095em;
  text-transform: uppercase;
}

.hero .eyebrow {
  font-size: clamp(0.9rem, 1.15vw, 1rem);
}

h1 {
  max-width: 850px;
  margin: 66px 0 28px;
  font-size: clamp(3rem, 5.35vw, 5.05rem);
  font-weight: 570;
  line-height: 1;
  letter-spacing: -0.055em;
  text-wrap: balance;
}

h1 span {
  color: var(--accent);
}

.hero-lead {
  max-width: 720px;
  margin: 0;
  color: #424945;
  font-size: clamp(1.04rem, 1.42vw, 1.2rem);
  line-height: 1.65;
}

.invite {
  padding: 28px 0 0;
  border-top: 1px solid var(--ink);
}

.invite-label {
  color: var(--accent);
}

.invite h2 {
  margin: 18px 0 14px;
  font-size: clamp(1.55rem, 2.2vw, 2rem);
  font-weight: 590;
  line-height: 1.13;
  letter-spacing: -0.035em;
}

.invite-intro {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.result-list,
.credential-list,
.signal-grid {
  list-style: none;
}

.result-list {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
}

.result-list li {
  position: relative;
  padding-left: 23px;
  font-size: 0.9rem;
  line-height: 1.5;
}

.result-list li::before {
  position: absolute;
  top: 0.52em;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  content: "";
}

.cta-group {
  margin-top: 26px;
}

.primary-button {
  display: flex;
  width: 100%;
  min-height: 54px;
  padding: 14px 20px;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  border-radius: 10px;
  background: var(--accent);
  box-shadow: 0 7px 20px rgb(52 69 98 / 16%);
  color: #fff;
  font-size: 0.94rem;
  font-weight: 650;
  line-height: 1.3;
  text-decoration: none;
  transition: background-color 0.18s ease, transform 0.18s ease,
    box-shadow 0.18s ease;
}

.primary-button:hover {
  background: var(--accent-dark);
  box-shadow: 0 10px 26px rgb(52 69 98 / 22%);
  transform: translateY(-1px);
}

.primary-button:focus-visible {
  outline: 3px solid #9aa6bb;
  outline-offset: 3px;
}

.cta-group > p {
  margin: 9px 0 0;
  color: var(--muted);
  font-size: 0.77rem;
  text-align: center;
}

.section {
  padding: 104px 0;
  border-bottom: 1px solid var(--line);
}

.section-heading h2,
.about h2,
.final-cta h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.65rem);
  font-weight: 570;
  line-height: 1.04;
  letter-spacing: -0.05em;
  text-wrap: balance;
}

.section-heading-split {
  display: grid;
  grid-template-columns: 190px minmax(0, 720px);
  gap: 46px;
  align-items: start;
}

.section-kicker {
  padding-top: 9px;
  color: var(--accent);
}

.section-intro {
  margin: 38px 0 0 236px;
  color: var(--muted);
  font-size: 1.04rem;
}

.signal-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 48px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.signal-grid li {
  position: relative;
  min-height: 132px;
  padding: 28px 42px 28px 36px;
  border-bottom: 1px solid var(--line);
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  line-height: 1.5;
}

.signal-grid li:nth-child(odd) {
  padding-left: 0;
  border-right: 1px solid var(--line);
}

.signal-grid li::before {
  position: absolute;
  top: 37px;
  left: 14px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  content: "";
}

.signal-grid li:nth-child(odd)::before {
  left: auto;
  right: 19px;
}

.about {
  background: var(--paper-light);
}

.about-grid {
  display: grid;
  grid-template-columns: minmax(300px, 0.72fr) minmax(0, 1.28fr);
  gap: clamp(64px, 8vw, 110px);
  align-items: start;
}

.about-identity {
  position: sticky;
  top: 36px;
}

.about-photo {
  display: block;
  width: 180px;
  height: 180px;
  margin-bottom: 40px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: 0 12px 34px rgb(28 33 31 / 14%);
}

.about .section-kicker {
  padding: 0;
}

.about h2 {
  margin-top: 20px;
  font-size: clamp(2.4rem, 4.5vw, 4rem);
}

.about-role {
  max-width: 420px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: 1.1rem;
  line-height: 1.6;
}

.credential-list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.credential-list li {
  position: relative;
  padding: 17px 0 17px 28px;
  border-bottom: 1px solid var(--line);
  font-size: 1.02rem;
}

.credential-list li::before {
  position: absolute;
  top: 25px;
  left: 2px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  content: "";
}

.experience-card {
  margin-top: 52px;
  padding: 32px;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
}

.experience-label {
  color: var(--accent);
}

.experience-card > p:last-child {
  margin: 18px 0 0;
  font-size: 1.04rem;
  line-height: 1.68;
}

.partner-note {
  margin: 36px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

.hypothesis {
  background: var(--accent);
  color: #fff;
  border-bottom: 0;
}

.hypothesis .section-kicker,
.hypothesis .card-index {
  color: #cbd2df;
}

.hypothesis-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.55fr);
  gap: 58px;
  align-items: end;
}

.hypothesis-heading > p {
  margin: 0 0 4px;
  color: #dfe4ec;
  font-size: 1rem;
  line-height: 1.65;
}

.hypothesis .section-heading-split {
  grid-template-columns: 150px minmax(0, 1fr);
  gap: 30px;
}

.level-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 72px;
  border-top: 1px solid rgb(255 255 255 / 25%);
}

.level-grid article {
  min-height: 300px;
  padding: 28px 32px 0;
  border-left: 1px solid rgb(255 255 255 / 25%);
}

.level-grid article:first-child {
  padding-left: 0;
  border-left: 0;
}

.level-grid h3,
.process-grid h3 {
  margin: 54px 0 18px;
  font-size: clamp(1.35rem, 2vw, 1.75rem);
  font-weight: 580;
  line-height: 1.18;
  letter-spacing: -0.035em;
}

.level-grid article > p:last-child {
  margin: 0;
  color: #dfe4ec;
  font-size: 0.95rem;
  line-height: 1.65;
}

.hypothesis-note {
  max-width: 800px;
  margin: 54px 0 0;
  padding-top: 30px;
  border-top: 1px solid rgb(255 255 255 / 25%);
  color: #fff;
  font-size: clamp(1.15rem, 1.8vw, 1.4rem);
  line-height: 1.55;
}

.process {
  background: var(--paper-light);
}

.process-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 64px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.process-grid li {
  min-height: 245px;
  padding: 28px 42px 34px 0;
  border-bottom: 1px solid var(--line);
}

.process-grid li:nth-child(odd) {
  border-right: 1px solid var(--line);
}

.process-grid li:nth-child(even) {
  padding-left: 42px;
}

.process-grid h3 {
  margin-top: 42px;
}

.process-grid li > p:last-child {
  max-width: 460px;
  margin: 0;
  color: var(--muted);
  line-height: 1.62;
}

.process-note {
  margin: 30px 0 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.privacy {
  padding-top: 76px;
  padding-bottom: 76px;
}

.privacy-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 80px;
  align-items: start;
}

.privacy h2 {
  margin-top: 22px;
  font-size: clamp(2rem, 3vw, 2.7rem);
}

.privacy-copy {
  padding-top: 3px;
}

.privacy-copy p {
  margin: 0;
  color: #424945;
  font-size: 1.02rem;
  line-height: 1.68;
}

.privacy-copy p + p {
  margin-top: 20px;
}

.final-cta {
  background: var(--paper-light);
  border-bottom: 0;
}

.final-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 350px;
  gap: 70px;
  align-items: end;
}

.final-cta h2 {
  max-width: 760px;
  margin-top: 24px;
}

.final-cta .final-grid > div:first-child > p:last-child {
  max-width: 650px;
  margin: 30px 0 0;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.65;
}

.final-cta .cta-group {
  margin: 0;
}

.mobile-cta {
  display: none;
}

@media (max-width: 900px) {
  .page-width {
    width: min(100% - 36px, 680px);
  }

  .hero {
    padding: 24px 0 60px;
  }

  .hero-grid,
  .about-grid,
  .hypothesis-heading,
  .privacy-grid,
  .final-grid {
    grid-template-columns: 1fr;
  }

  .hero-grid {
    gap: 48px;
  }

  h1 {
    margin: 52px 0 24px;
    font-size: clamp(2.75rem, 9.5vw, 4.65rem);
  }

  .invite {
    padding-top: 25px;
  }

  .section {
    padding: 78px 0;
  }

  .section-heading-split,
  .hypothesis .section-heading-split {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 30px;
  }

  .section-intro {
    margin-left: 170px;
  }

  .about-grid,
  .hypothesis-heading,
  .privacy-grid,
  .final-grid {
    gap: 48px;
  }

  .about-identity {
    position: static;
    display: grid;
    grid-template-columns: 132px 1fr;
    gap: 34px;
    align-items: center;
  }

  .about-photo {
    width: 132px;
    height: 132px;
    margin: 0;
  }

  .level-grid {
    grid-template-columns: 1fr;
  }

  .level-grid article,
  .level-grid article:first-child {
    min-height: auto;
    padding: 28px 0 32px;
    border-bottom: 1px solid rgb(255 255 255 / 25%);
    border-left: 0;
  }

  .level-grid h3 {
    margin-top: 28px;
  }
}

@media (max-width: 620px) {
  body {
    padding-bottom: 84px;
  }

  .page-width {
    width: calc(100% - 32px);
  }

  .hero {
    padding-top: 20px;
  }

  .eyebrow,
  .invite-label,
  .section-kicker,
  .experience-label,
  .card-index {
    font-size: 0.7rem;
  }

  h1 {
    margin-top: 42px;
    font-size: clamp(2.35rem, 11.5vw, 3.25rem);
    line-height: 1.01;
    letter-spacing: -0.06em;
  }

  .hero-lead {
    font-size: 1rem;
    line-height: 1.58;
  }

  .hero-grid {
    gap: 40px;
  }

  .invite h2 {
    font-size: 1.75rem;
  }

  .invite .cta-group {
    display: none;
  }

  .result-list li {
    font-size: 0.93rem;
  }

  .section {
    padding: 68px 0;
  }

  .section-heading-split,
  .hypothesis .section-heading-split {
    display: block;
  }

  .section-heading h2 {
    margin-top: 18px;
    font-size: 2.35rem;
  }

  .section-intro {
    margin: 25px 0 0;
  }

  .signal-grid {
    grid-template-columns: 1fr;
    margin-top: 36px;
  }

  .signal-grid li,
  .signal-grid li:nth-child(odd) {
    min-height: auto;
    padding: 22px 0 22px 22px;
    border-right: 0;
  }

  .signal-grid li::before,
  .signal-grid li:nth-child(odd)::before {
    top: 31px;
    right: auto;
    left: 0;
  }

  .about-grid {
    gap: 42px;
  }

  .about-identity {
    display: block;
  }

  .about-photo {
    width: 116px;
    height: 116px;
    margin-bottom: 32px;
  }

  .about h2 {
    margin-top: 16px;
    font-size: 2.65rem;
  }

  .about-role {
    margin-top: 20px;
    font-size: 1rem;
  }

  .credential-list li {
    font-size: 0.96rem;
  }

  .experience-card {
    margin-top: 40px;
    padding: 25px 22px;
  }

  .experience-card > p:last-child,
  .partner-note {
    font-size: 0.95rem;
  }

  .hypothesis-heading {
    gap: 28px;
  }

  .hypothesis-heading > p {
    font-size: 0.96rem;
  }

  .level-grid {
    margin-top: 44px;
  }

  .hypothesis-note {
    margin-top: 36px;
    font-size: 1.12rem;
  }

  .process-grid {
    grid-template-columns: 1fr;
    margin-top: 44px;
  }

  .process-grid li,
  .process-grid li:nth-child(even) {
    min-height: auto;
    padding: 24px 0 28px;
    border-right: 0;
  }

  .process-grid h3 {
    margin-top: 26px;
    font-size: 1.45rem;
  }

  .privacy {
    padding-top: 62px;
    padding-bottom: 62px;
  }

  .privacy-grid {
    gap: 30px;
  }

  .privacy h2 {
    margin-top: 18px;
    font-size: 2.35rem;
  }

  .final-grid {
    gap: 34px;
  }

  .final-cta h2 {
    font-size: 2.35rem;
  }

  .final-cta .cta-group {
    display: none;
  }

  .mobile-cta {
    position: fixed;
    z-index: 10;
    right: 12px;
    bottom: 10px;
    left: 12px;
    display: block;
    padding: 8px;
    border: 1px solid rgb(217 215 208 / 80%);
    border-radius: 14px;
    background: rgb(251 250 247 / 88%);
    box-shadow: 0 10px 36px rgb(28 33 31 / 14%);
    backdrop-filter: blur(14px);
  }

  .mobile-cta .cta-group {
    margin: 0;
  }

  .mobile-cta .primary-button {
    min-height: 50px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}