:root {
  color-scheme: light;
  --ink: #102833;
  --muted: #526a73;
  --paper: #f4f9fa;
  --surface: #ffffff;
  --moon: #d9ecff;
  --stream: #4d93bd;
  --stream-deep: #286585;
  --leaf: #2d6a4f;
  --food: #e96638;
  --line: #c9d9de;
  --night: #12303d;
  --text-on-night: #d9ecff;
  --focus: #0a6dad;
  --radius: 1.1rem;
  --page: min(74rem, calc(100vw - 2.5rem));
  font-family: Inter, Pretendard, system-ui, -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
}

body {
  margin: 0;
  background:
    linear-gradient(90deg, transparent 49.9%, rgb(77 147 189 / 7%) 50%, transparent 50.1%) 0 0 / 9rem 100%,
    var(--paper);
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.65;
}

a {
  color: inherit;
  text-underline-offset: 0.22em;
}

a:focus-visible,
summary:focus-visible {
  outline: 0.2rem solid var(--focus);
  outline-offset: 0.2rem;
  border-radius: 0.25rem;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.65rem 0.9rem;
  border-radius: 0.5rem;
  background: var(--surface);
  color: var(--ink);
  transform: translateY(-180%);
}

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

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 2rem;
  width: 100%;
  min-height: 4.5rem;
  padding: 0.7rem max(1.25rem, calc((100vw - 74rem) / 2));
  border-bottom: 1px solid rgb(201 217 222 / 80%);
  background: rgb(244 249 250 / 92%);
  backdrop-filter: blur(1rem);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-weight: 780;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 2.1rem;
  height: 2.1rem;
  place-items: center;
  border-radius: 50%;
  background: var(--night);
  color: var(--moon);
  font-family: Georgia, serif;
  font-size: 1.2rem;
}

nav {
  display: flex;
  justify-content: center;
  gap: clamp(1rem, 3vw, 2.25rem);
}

nav a {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 650;
  text-decoration: none;
}

nav a:hover {
  color: var(--ink);
}

.header-state {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--leaf);
  font-size: 0.82rem;
  font-weight: 720;
}

.header-state span {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--leaf);
}

main,
footer {
  width: var(--page);
  margin-inline: auto;
}

.overview {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(18rem, 0.7fr);
  gap: clamp(2rem, 6vw, 6.5rem);
  align-items: center;
  min-height: calc(100svh - 4.5rem);
  padding-block: clamp(4rem, 10vw, 8rem);
}

.context,
.section-heading > div > p,
.decision-intro > p:first-child {
  margin: 0 0 0.8rem;
  color: var(--stream-deep);
  font-size: 0.92rem;
  font-weight: 760;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  overflow-wrap: break-word;
  word-break: keep-all;
}

h1 {
  max-width: 12ch;
  margin-bottom: 1.5rem;
  font-size: clamp(3.4rem, 8vw, 7.4rem);
  font-weight: 820;
  letter-spacing: 0;
  line-height: 0.98;
}

.lede {
  max-width: 43rem;
  margin-bottom: 2rem;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  line-height: 1.8;
}

.overview-actions,
.evidence-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1.3rem;
  align-items: center;
}

.primary-action {
  display: inline-flex;
  min-height: 3rem;
  align-items: center;
  padding: 0.65rem 1.1rem;
  border-radius: 0.7rem;
  background: var(--night);
  color: #fff;
  font-weight: 720;
  text-decoration: none;
}

.primary-action:hover {
  background: #1a4658;
}

.text-action,
.evidence-grid a {
  color: var(--stream-deep);
  font-weight: 720;
}

.truth-board {
  position: relative;
  overflow: hidden;
  padding: 1.4rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 1.4rem 4rem rgb(16 40 51 / 10%);
}

.truth-board::before {
  position: absolute;
  z-index: 0;
  inset: 0.65rem 0.65rem auto auto;
  width: 4.3rem;
  height: 4.3rem;
  border: 0.85rem solid var(--moon);
  border-radius: 50%;
  content: "";
  transform: translate(35%, -35%);
}

.truth-board > * {
  position: relative;
  z-index: 1;
}

.truth-heading {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid var(--line);
}

.truth-heading h2 {
  font-size: 1.05rem;
}

.truth-heading span,
.truth-board > p {
  color: var(--muted);
  font-size: 0.78rem;
}

.truth-board dl {
  margin: 0;
}

.truth-board dl > div {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  padding-block: 1rem;
  border-bottom: 1px solid #e5eef0;
}

.truth-board dt {
  font-weight: 680;
}

.truth-board dd {
  margin: 0;
}

.truth-board > p {
  margin: 1rem 0 0;
}

.status {
  display: inline-flex;
  min-height: 1.65rem;
  align-items: center;
  padding-inline: 0.55rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 820;
  letter-spacing: 0.02em;
}

.status-verified {
  background: #dceee4;
  color: #23543e;
}

.status-planned,
.status-not-run {
  background: #e6eef1;
  color: #435e68;
}

.status-implemented {
  background: #d9ecff;
  color: #245976;
}

.status-in-progress {
  background: #fff1d6;
  color: #754b00;
}

.status-blocked {
  background: #fce4da;
  color: #9a371d;
}

.status-legend {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  margin-bottom: 2rem;
  border-block: 1px solid var(--line);
}

.status-legend span {
  padding: 1rem 0.8rem;
  color: var(--muted);
  font-size: 0.78rem;
}

.status-legend b {
  display: block;
  color: var(--ink);
  font-size: 0.76rem;
}

.section {
  padding-block: clamp(5rem, 9vw, 8rem);
  border-bottom: 1px solid var(--line);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(18rem, 0.8fr);
  gap: 3rem;
  align-items: end;
  margin-bottom: 3.2rem;
}

.section-heading.compact {
  margin-bottom: 2.4rem;
}

.section-heading h2,
.decision-intro h2 {
  max-width: 17ch;
  margin-bottom: 0;
  font-size: clamp(2.1rem, 5vw, 4.3rem);
  letter-spacing: 0;
  line-height: 1.08;
}

.section-heading > p,
.decision-intro > p {
  max-width: 40rem;
  margin-bottom: 0;
  color: var(--muted);
}

.route {
  position: relative;
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.route::before {
  position: absolute;
  z-index: -1;
  top: 1.45rem;
  right: 5%;
  left: 5%;
  height: 0.22rem;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--stream), var(--leaf), var(--food));
  content: "";
}

.route li {
  min-width: 0;
  text-align: center;
}

.route li > span {
  display: grid;
  width: 3rem;
  height: 3rem;
  margin: 0 auto 1rem;
  place-items: center;
  border: 0.28rem solid var(--paper);
  border-radius: 50%;
  background: var(--night);
  color: #fff;
  font-weight: 780;
  box-shadow: 0 0 0 1px var(--line);
}

.route strong,
.route small {
  display: block;
}

.route strong {
  font-size: 0.92rem;
}

.route small {
  margin-top: 0.25rem;
  color: var(--muted);
  font-size: 0.72rem;
  line-height: 1.35;
}

.architecture-map {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
}

.architecture-lane {
  display: grid;
  align-content: start;
  gap: 0.8rem;
  min-width: 0;
  padding: clamp(1rem, 3vw, 2rem);
  background: var(--surface);
}

.architecture-lane h3 {
  margin-bottom: 0.7rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.node,
.privacy-note {
  display: grid;
  gap: 0.18rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  background: #f9fcfc;
  font-weight: 720;
}

.node small,
.privacy-note span {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 520;
}

.primary-node {
  border-color: var(--stream);
  background: #eff8fc;
}

.wallet-node {
  border-color: var(--food);
}

.chain-node {
  border-color: var(--leaf);
  background: #eff8f3;
}

.privacy-note {
  margin-top: 1rem;
  border-style: dashed;
  background: transparent;
}

.evidence-grid {
  display: grid;
  grid-template-columns: 1.25fr 1fr 1fr;
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
}

.evidence-grid article {
  min-width: 0;
  padding: clamp(1.4rem, 3vw, 2.4rem);
  background: var(--surface);
}

.evidence-primary {
  background: var(--night) !important;
  color: #fff;
}

.evidence-grid .evidence-primary p,
.evidence-primary a {
  color: var(--text-on-night);
}

.evidence-number {
  display: block;
  margin-bottom: 1.8rem;
  color: var(--stream-deep);
  font-family: Georgia, serif;
  font-size: clamp(3rem, 7vw, 5.5rem);
  line-height: 0.9;
}

.evidence-primary .evidence-number {
  color: var(--moon);
}

.evidence-grid h3 {
  margin-bottom: 0.7rem;
  font-size: 1.15rem;
}

.evidence-grid p {
  color: var(--muted);
}

.test-groups {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.2rem;
}

.test-groups span {
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: rgb(255 255 255 / 72%);
  color: var(--muted);
  font-size: 0.8rem;
}

.test-groups b {
  color: var(--ink);
}

.score-map {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(1rem, 4vw, 4rem);
}

.score-column {
  padding: clamp(1.2rem, 3vw, 2rem);
  border-top: 0.35rem solid var(--stream);
  background: var(--surface);
}

.score-column:last-child {
  border-top-color: var(--food);
}

.score-column h3 {
  margin-bottom: 1.5rem;
}

.score-column p {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid #e4edef;
}

.score-column p::after {
  position: absolute;
  bottom: -1px;
  left: 0;
  width: var(--score);
  height: 0.18rem;
  background: var(--stream);
  content: "";
}

.score-column:last-child p::after {
  background: var(--food);
}

.decision-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 7vw, 7rem);
  margin-block: 3rem;
  padding-inline: clamp(1.5rem, 4vw, 4rem);
  border-bottom: 0;
  border-radius: 1.4rem;
  background: var(--night);
  color: #fff;
}

.decision-intro > p {
  color: #c7d9df;
}

.decision-section .decision-intro > p:first-child {
  color: var(--text-on-night);
}

.decision-intro h2 {
  margin-bottom: 1.3rem;
}

.primary-action.light {
  margin-top: 1.4rem;
  background: var(--moon);
  color: var(--night);
}

.decision-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.decision-list li {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1rem;
  align-items: center;
  padding-block: 1rem;
  border-bottom: 1px solid rgb(217 236 255 / 18%);
}

.decision-list span,
.decision-list small {
  color: #a9c5cf;
  font-size: 0.75rem;
}

.document-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
}

.document-list a {
  display: grid;
  gap: 0.3rem;
  min-width: 0;
  padding: 1.3rem 1rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  text-decoration: none;
}

.document-list a:nth-child(3n) {
  border-right: 0;
}

.document-list a:hover {
  background: var(--surface);
}

.document-list span {
  color: var(--muted);
  font-size: 0.8rem;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  padding-block: 2rem 4rem;
  color: var(--muted);
  font-size: 0.82rem;
}

footer p {
  margin-bottom: 0;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1.2rem;
  justify-content: flex-end;
}

@media (max-width: 58rem) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  nav {
    display: none;
  }

  .overview,
  .section-heading,
  .decision-section {
    grid-template-columns: 1fr;
  }

  .overview {
    min-height: auto;
  }

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

  .route {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.8rem 0.6rem;
  }

  .route::before {
    display: none;
  }

  .architecture-map,
  .evidence-grid {
    grid-template-columns: 1fr;
  }

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

  .document-list a:nth-child(3n) {
    border-right: 1px solid var(--line);
  }

  .document-list a:nth-child(2n) {
    border-right: 0;
  }
}

@media (max-width: 38rem) {
  :root {
    --page: min(100% - 1.25rem, 74rem);
  }

  .site-header {
    grid-template-columns: minmax(0, 1fr) minmax(0, 8rem);
    gap: 0.5rem;
    min-height: 4rem;
    padding-inline: 0.7rem;
  }

  .brand-mark {
    width: 1.8rem;
    height: 1.8rem;
  }

  .header-state {
    min-width: 0;
    width: auto;
    justify-self: end;
    justify-content: flex-end;
    font-size: 0;
    line-height: 1.25;
    text-align: right;
  }

  .header-state::after {
    content: "P4 출시 준비";
    font-size: 0.72rem;
    white-space: nowrap;
  }

  .truth-board dl > div {
    gap: 0.55rem;
    align-items: flex-start;
  }

  .truth-board dt {
    min-width: 0;
    overflow-wrap: anywhere;
    line-height: 1.45;
  }

  .truth-board dd {
    flex: none;
  }

  h1 {
    font-size: clamp(2.7rem, 12vw, 3.4rem);
  }

  .overview {
    gap: 2.5rem;
    padding-block: 3.5rem;
  }

  .status-legend,
  .score-map,
  .document-list {
    grid-template-columns: 1fr;
  }

  .route {
    grid-template-columns: 1fr;
    gap: 0;
    margin-left: 0.7rem;
  }

  .route::before {
    display: block;
    top: 1.5rem;
    bottom: 1.5rem;
    left: 1.4rem;
    width: 0.2rem;
    height: auto;
  }

  .route li {
    display: grid;
    grid-template-columns: 3rem 1fr;
    gap: 0.8rem;
    align-items: center;
    min-height: 5rem;
    text-align: left;
  }

  .route li > span {
    grid-row: 1 / 3;
    margin: 0;
  }

  .route strong {
    align-self: end;
  }

  .route small {
    align-self: start;
    margin: 0;
  }

  .decision-section {
    margin-inline: -0.15rem;
    padding-inline: 1.2rem;
  }

  .decision-list li {
    grid-template-columns: auto 1fr;
  }

  .decision-list small {
    grid-column: 2;
  }

  .document-list a,
  .document-list a:nth-child(3n) {
    border-right: 0;
  }

  footer {
    flex-direction: column;
  }

  .footer-links {
    justify-content: flex-start;
  }
}

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

@media print {
  .site-header,
  .overview-actions,
  footer a {
    display: none;
  }

  body {
    background: #fff;
  }

  .overview {
    min-height: auto;
  }
}