@font-face {
  font-family: "CIT Montserrat";
  src: url("/assets/fonts/montserrat-regular-webfont.woff2") format("woff2");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: "CIT Montserrat";
  src: url("/assets/fonts/montserrat-bold-webfont.woff2") format("woff2");
  font-style: normal;
  font-weight: 700;
  font-display: swap;
}

:root {
  color-scheme: light dark;
  --sbi-paper: #f5f0e8;
  --sbi-surface: #fffdf8;
  --sbi-ink: #1b272c;
  --sbi-muted: #59676b;
  --sbi-line: #cfc8bd;
  --sbi-soft-line: #e4ddd2;
  --sbi-coral: #b84b3e;
  --sbi-coral-soft: #f1d6cf;
  --sbi-moss: #53756c;
  --sbi-dark: #18262b;
  --sbi-on-dark: #fffaf1;
  --sbi-on-dark-muted: #c7d1ce;
  --sbi-shadow: 0 28px 70px rgb(30 41 45 / 14%);
  --sbi-shell: min(1160px, calc(100vw - 48px));
  --sbi-font: "CIT Montserrat", "Pretendard", "Noto Sans KR", "Apple SD Gothic Neo", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --sbi-paper: #131a1d;
    --sbi-surface: #1b2428;
    --sbi-ink: #f7f1e7;
    --sbi-muted: #b7c1c1;
    --sbi-line: #465256;
    --sbi-soft-line: #303a3e;
    --sbi-coral: #f18b78;
    --sbi-coral-soft: #4a2c28;
    --sbi-moss: #9ebbb2;
    --sbi-dark: #0d1316;
    --sbi-shadow: 0 28px 70px rgb(0 0 0 / 38%);
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
  background: var(--sbi-paper);
}

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--sbi-paper);
  color: var(--sbi-ink);
  font-family: var(--sbi-font);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

body > #navBarContainer {
  position: relative;
  z-index: 100;
}

body > #navBarContainer .sticky-header {
  background: rgb(255 255 255 / 96%);
  color-scheme: light;
  backdrop-filter: blur(14px);
}

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

a {
  color: inherit;
}

.sbi-skip {
  position: fixed;
  z-index: 999;
  top: 10px;
  left: 10px;
  padding: 10px 16px;
  transform: translateY(-160%);
  border-radius: 6px;
  background: var(--sbi-dark);
  color: var(--sbi-on-dark);
  font-weight: 700;
}

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

.sbi-shell {
  width: var(--sbi-shell);
  margin-inline: auto;
}

.sbi-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--sbi-line);
}

.sbi-hero::before {
  position: absolute;
  top: 44px;
  left: -180px;
  width: 450px;
  height: 450px;
  border: 1px solid color-mix(in srgb, var(--sbi-coral) 38%, transparent);
  border-radius: 50%;
  box-shadow: 0 0 0 76px color-mix(in srgb, var(--sbi-coral) 4%, transparent), 0 0 0 152px color-mix(in srgb, var(--sbi-coral) 3%, transparent);
  content: "";
  pointer-events: none;
}

.sbi-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, .92fr) minmax(420px, 1.08fr);
  align-items: center;
  min-height: 680px;
  gap: clamp(40px, 6vw, 88px);
  padding-block: clamp(64px, 9vw, 116px);
}

.sbi-hero-copy {
  position: relative;
  z-index: 1;
}

.sbi-lang {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  margin-bottom: 26px;
  color: var(--sbi-muted);
  font-size: .78rem;
  font-weight: 700;
  text-decoration-thickness: 1px;
  text-underline-offset: 5px;
}

.sbi-eyebrow,
.sbi-kicker {
  margin: 0 0 14px;
  color: var(--sbi-coral);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .14em;
  line-height: 1.45;
  text-transform: uppercase;
}

.sbi-hero h1 {
  max-width: 690px;
  margin: 0;
  font-size: clamp(2.6rem, 5.6vw, 5.25rem);
  font-weight: 700;
  letter-spacing: -.065em;
  line-height: .98;
  text-wrap: balance;
}

.sbi-hero h1 > span {
  display: block;
  white-space: nowrap;
}

.sbi-hero h1 .sbi-h1-long {
  margin-top: .08em;
  font-size: .82em;
}

.sbi-hero h1.sbi-hero-title-en {
  font-size: clamp(2.75rem, 4.7vw, 4.15rem);
}

.sbi-lead {
  max-width: 620px;
  margin: 28px 0 0;
  color: var(--sbi-muted);
  font-size: clamp(1rem, 1.4vw, 1.18rem);
  line-height: 1.75;
}

.sbi-research-note {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  max-width: 650px;
  margin-top: 22px;
  padding-top: 20px;
  border-top: 1px solid var(--sbi-line);
  font-size: .78rem;
}

.sbi-research-note strong {
  color: var(--sbi-moss);
  white-space: nowrap;
}

.sbi-research-note span {
  color: var(--sbi-muted);
}

.sbi-university-rail {
  margin-top: 28px;
}

.sbi-university-rail > p {
  margin: 0 0 9px;
  color: var(--sbi-muted);
  font-size: .67rem;
  font-weight: 700;
  letter-spacing: .1em;
  line-height: 1.35;
  text-transform: uppercase;
}

.sbi-university-rail ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.sbi-university-rail li {
  display: grid;
  align-content: center;
  min-height: 70px;
  padding: 12px 14px;
  border-radius: 10px;
  color: #fff;
}

.sbi-university-rail li strong {
  font-size: clamp(.92rem, 1.2vw, 1.14rem);
  letter-spacing: -.035em;
  line-height: 1.08;
}

.sbi-university-rail li span {
  margin-top: 6px;
  color: rgb(255 255 255 / 82%);
  font-size: .64rem;
  font-weight: 700;
  line-height: 1.25;
}

.sbi-university-rail li[data-institution="stanford"] {
  background: #8c1515;
}

.sbi-university-rail li[data-institution="stanford-medicine"] {
  background: #006b8f;
}

.sbi-university-rail li[data-institution="harvard"] {
  background: #4b3f8f;
}

.sbi-university-rail li[data-institution="github"] {
  background: #263238;
}

.sbi-process .sbi-university-rail {
  margin: 0 0 46px;
}

.sbi-process .sbi-university-rail > p {
  color: var(--sbi-on-dark-muted);
}

.sbi-process .sbi-university-rail ul {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.sbi-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.sbi-button {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  padding: 13px 20px;
  border: 1px solid var(--sbi-ink);
  border-radius: 999px;
  background: var(--sbi-ink);
  color: var(--sbi-paper);
  font-size: .87rem;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  transition: transform 180ms ease, background-color 180ms ease, color 180ms ease;
}

.sbi-button:hover,
.sbi-button:focus-visible {
  transform: translateY(-2px);
}

.sbi-button-secondary {
  background: transparent;
  color: var(--sbi-ink);
}

.sbi-visual {
  position: relative;
  min-height: 570px;
}

.sbi-visual-main {
  width: min(100%, 630px);
  height: 520px;
  margin-left: auto;
  object-fit: cover;
  object-position: center;
  border-radius: 24px 24px 96px 24px;
  box-shadow: var(--sbi-shadow);
}

.sbi-visual-caption {
  position: absolute;
  right: -24px;
  bottom: 0;
  width: min(320px, 74%);
  padding: 22px 24px;
  border: 1px solid rgb(255 255 255 / 18%);
  border-radius: 16px;
  background: var(--sbi-dark);
  color: var(--sbi-on-dark);
  box-shadow: var(--sbi-shadow);
}

.sbi-visual-caption span {
  display: block;
  margin-bottom: 8px;
  color: #f2a090;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.sbi-visual-caption p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.6;
}

.sbi-facts {
  border-bottom: 1px solid var(--sbi-line);
}

.sbi-facts ul {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 0;
  padding: 0;
  list-style: none;
}

.sbi-facts li {
  padding: 27px 22px;
  border-right: 1px solid var(--sbi-line);
}

.sbi-facts li:first-child {
  border-left: 1px solid var(--sbi-line);
}

.sbi-facts strong,
.sbi-facts span {
  display: block;
}

.sbi-facts strong {
  margin-bottom: 4px;
  font-size: 1.03rem;
}

.sbi-facts span {
  color: var(--sbi-muted);
  font-size: .8rem;
}

.sbi-section {
  padding-block: clamp(78px, 10vw, 132px);
}

.sbi-section + .sbi-section {
  border-top: 1px solid var(--sbi-soft-line);
}

.sbi-section-head {
  max-width: 760px;
  margin-bottom: 48px;
}

.sbi-section-head h2,
.sbi-copy h2,
.sbi-research-copy h2,
.sbi-cta h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.65rem);
  letter-spacing: -.055em;
  line-height: 1.08;
  text-wrap: balance;
}

.sbi-section-head > p:last-child,
.sbi-copy > p,
.sbi-research-copy > p {
  margin: 20px 0 0;
  color: var(--sbi-muted);
  font-size: 1rem;
}

.sbi-definition {
  display: grid;
  grid-template-columns: minmax(0, .78fr) minmax(0, 1.22fr);
  gap: clamp(48px, 8vw, 112px);
  align-items: start;
}

.sbi-definition-question {
  position: sticky;
  top: 108px;
}

.sbi-definition-question p {
  margin: 0;
  color: var(--sbi-coral);
  font-size: .73rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.sbi-definition-question h2 {
  margin: 16px 0 0;
  font-size: clamp(2rem, 4vw, 3.4rem);
  letter-spacing: -.055em;
  line-height: 1.1;
}

.sbi-definition-answer {
  padding-left: clamp(28px, 4vw, 60px);
  border-left: 1px solid var(--sbi-line);
}

.sbi-definition-answer > p {
  margin: 0 0 34px;
  font-size: clamp(1.12rem, 2vw, 1.48rem);
  line-height: 1.65;
}

.sbi-definition-answer dl {
  margin: 0;
}

.sbi-definition-answer dl div {
  display: grid;
  grid-template-columns: 145px 1fr;
  gap: 20px;
  padding: 21px 0;
  border-top: 1px solid var(--sbi-soft-line);
}

.sbi-definition-answer dt {
  color: var(--sbi-moss);
  font-weight: 700;
}

.sbi-definition-answer dd {
  margin: 0;
  color: var(--sbi-muted);
}

.sbi-process {
  background: var(--sbi-dark);
  color: var(--sbi-on-dark);
}

.sbi-process .sbi-section-head > p:last-child {
  color: var(--sbi-on-dark-muted);
}

.sbi-process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid rgb(255 255 255 / 22%);
  border-bottom: 1px solid rgb(255 255 255 / 22%);
}

.sbi-process article {
  min-height: 260px;
  padding: 28px 24px 34px;
  border-right: 1px solid rgb(255 255 255 / 22%);
}

.sbi-process article:last-child {
  border-right: 0;
}

.sbi-process article > span {
  display: block;
  margin-bottom: 46px;
  color: #f2a090;
  font-size: .75rem;
  font-weight: 700;
}

.sbi-process h3 {
  margin: 0;
  font-size: 1.2rem;
  letter-spacing: -.03em;
}

.sbi-process article p {
  margin: 13px 0 0;
  color: var(--sbi-on-dark-muted);
  font-size: .88rem;
}

.sbi-privacy-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, .92fr);
  gap: clamp(50px, 8vw, 108px);
  align-items: center;
}

.sbi-photo-pair {
  display: grid;
  grid-template-columns: 1.12fr .88fr;
  align-items: end;
  gap: 16px;
}

.sbi-photo-pair figure {
  margin: 0;
}

.sbi-photo-pair figure:last-child {
  transform: translateY(34px);
}

.sbi-photo-pair img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border-radius: 18px;
}

.sbi-photo-pair figcaption {
  margin-top: 10px;
  color: var(--sbi-muted);
  font-size: .72rem;
}

.sbi-rules {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.sbi-rules li {
  position: relative;
  padding: 15px 0 15px 32px;
  border-top: 1px solid var(--sbi-soft-line);
  color: var(--sbi-muted);
}

.sbi-rules li::before {
  position: absolute;
  top: 20px;
  left: 2px;
  width: 14px;
  height: 8px;
  border-bottom: 2px solid var(--sbi-moss);
  border-left: 2px solid var(--sbi-moss);
  transform: rotate(-45deg);
  content: "";
}

.sbi-research {
  background: var(--sbi-surface);
}

.sbi-research-grid {
  display: grid;
  grid-template-columns: minmax(0, .72fr) minmax(0, 1.28fr);
  gap: clamp(52px, 8vw, 118px);
}

.sbi-source-list {
  border-top: 1px solid var(--sbi-line);
}

.sbi-source-list a {
  display: grid;
  grid-template-columns: 34px 1fr auto;
  gap: 16px;
  align-items: start;
  padding: 22px 0;
  border-bottom: 1px solid var(--sbi-line);
  text-decoration: none;
}

.sbi-source-list a > span:first-child {
  color: var(--sbi-coral);
  font-size: .76rem;
  font-weight: 700;
}

.sbi-source-list b {
  display: block;
  font-size: .94rem;
}

.sbi-source-list small {
  display: block;
  margin-top: 6px;
  color: var(--sbi-muted);
  line-height: 1.55;
}

.sbi-source-list a > span:last-child {
  color: var(--sbi-muted);
}

.sbi-affiliation {
  margin: 24px 0 0;
  color: var(--sbi-muted);
  font-size: .78rem;
}

.sbi-outcomes {
  display: grid;
  grid-template-columns: minmax(0, .84fr) minmax(0, 1.16fr);
  gap: clamp(50px, 8vw, 110px);
}

.sbi-outcome-list {
  counter-reset: outcome;
  margin: 0;
  padding: 0;
  list-style: none;
}

.sbi-outcome-list li {
  counter-increment: outcome;
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 16px;
  padding: 24px 0;
  border-top: 1px solid var(--sbi-line);
}

.sbi-outcome-list li::before {
  content: "0" counter(outcome);
  color: var(--sbi-coral);
  font-size: .75rem;
  font-weight: 700;
}

.sbi-outcome-list b {
  display: block;
}

.sbi-outcome-list span {
  display: block;
  margin-top: 6px;
  color: var(--sbi-muted);
  font-size: .88rem;
}

.sbi-faq {
  background: var(--sbi-surface);
}

.sbi-faq-grid {
  display: grid;
  grid-template-columns: .7fr 1.3fr;
  gap: clamp(50px, 8vw, 108px);
}

.sbi-faq-list {
  border-top: 1px solid var(--sbi-line);
}

.sbi-faq details {
  border-bottom: 1px solid var(--sbi-line);
}

.sbi-faq summary {
  position: relative;
  min-height: 64px;
  padding: 20px 42px 20px 0;
  cursor: pointer;
  font-weight: 700;
  list-style: none;
}

.sbi-faq summary::-webkit-details-marker {
  display: none;
}

.sbi-faq summary::after {
  position: absolute;
  top: 20px;
  right: 4px;
  color: var(--sbi-coral);
  content: "+";
  font-size: 1.35rem;
}

.sbi-faq details[open] summary::after {
  content: "−";
}

.sbi-faq details p {
  margin: -4px 44px 22px 0;
  color: var(--sbi-muted);
}

.sbi-cta {
  padding-block: clamp(70px, 9vw, 112px);
  background: var(--sbi-coral-soft);
}

.sbi-cta-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 36px;
}

.sbi-cta p {
  max-width: 650px;
  margin: 18px 0 0;
  color: var(--sbi-muted);
}

.sbi-footer {
  padding: 32px 0;
  background: var(--sbi-dark);
  color: var(--sbi-on-dark-muted);
  font-size: .78rem;
}

.sbi-footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 28px;
}

.sbi-footer a {
  text-underline-offset: 4px;
}

@media (max-width: 980px) {
  .sbi-hero-grid,
  .sbi-definition,
  .sbi-privacy-grid,
  .sbi-research-grid,
  .sbi-outcomes,
  .sbi-faq-grid {
    grid-template-columns: 1fr;
  }

  .sbi-hero-grid {
    min-height: 0;
  }

  .sbi-visual {
    min-height: 490px;
  }

  .sbi-visual-main {
    width: 90%;
    height: 450px;
    margin-right: auto;
  }

  .sbi-visual-caption {
    right: 0;
  }

  .sbi-definition-question {
    position: static;
  }

  .sbi-definition-answer {
    padding-left: 0;
    border-left: 0;
  }

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

  .sbi-process article:nth-child(2) {
    border-right: 0;
  }

  .sbi-process article:nth-child(-n + 2) {
    border-bottom: 1px solid rgb(255 255 255 / 22%);
  }
}

@media (max-width: 720px) {
  :root {
    --sbi-shell: min(100% - 32px, 1160px);
  }

  .sbi-hero::before {
    left: -300px;
  }

  .sbi-hero-grid {
    gap: 46px;
    padding-block: 48px 70px;
  }

  .sbi-lang {
    margin-bottom: 18px;
  }

  .sbi-hero h1 {
    font-size: clamp(2.55rem, 13vw, 4rem);
  }

  .sbi-research-note {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .sbi-research-note strong {
    white-space: normal;
  }

  .sbi-process .sbi-university-rail ul {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .sbi-university-rail li {
    min-height: 66px;
    padding: 11px 12px;
  }

  .sbi-university-rail li strong {
    font-size: .88rem;
  }

  .sbi-actions,
  .sbi-actions .sbi-button {
    width: 100%;
  }

  .sbi-visual {
    min-height: 390px;
  }

  .sbi-visual-main {
    width: 100%;
    height: 360px;
    border-radius: 18px 18px 64px 18px;
  }

  .sbi-visual-caption {
    right: 12px;
    bottom: -30px;
    width: calc(100% - 42px);
  }

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

  .sbi-facts li:nth-child(3) {
    border-left: 1px solid var(--sbi-line);
  }

  .sbi-facts li:nth-child(-n + 2) {
    border-bottom: 1px solid var(--sbi-line);
  }

  .sbi-section {
    padding-block: 76px;
  }

  .sbi-section-head {
    margin-bottom: 34px;
  }

  .sbi-definition-answer dl div {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .sbi-process-grid {
    grid-template-columns: 1fr;
  }

  .sbi-process article {
    min-height: 0;
    border-right: 0;
    border-bottom: 1px solid rgb(255 255 255 / 22%);
  }

  .sbi-process article:last-child {
    border-bottom: 0;
  }

  .sbi-process article > span {
    margin-bottom: 20px;
  }

  .sbi-photo-pair {
    grid-template-columns: 1fr;
  }

  .sbi-photo-pair figure:last-child {
    transform: none;
  }

  .sbi-photo-pair img {
    aspect-ratio: 16 / 11;
  }

  .sbi-source-list a {
    grid-template-columns: 28px 1fr;
  }

  .sbi-source-list a > span:last-child {
    display: none;
  }

  .sbi-cta-inner {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .sbi-cta .sbi-button {
    width: 100%;
  }

  .sbi-footer-inner {
    flex-direction: column;
    gap: 8px;
  }
}

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

  .sbi-button {
    transition: none;
  }
}