:root {
  color-scheme: light;
  --page-max: 1280px;
  --page-gutter: 20px;
  --dark: #0a0a0a;
  --ink: #1a1a1a;
  --dim: #6b6b6b;
  --dim2: #9a9a9a;
  --line: #e5e5e5;
  --mist: #f7f7f7;
  --paper: #ffffff;
  --accent: #6b3ff6;
  --accent-soft: rgba(107, 63, 246, 0.08);
  --lime: #d4ff00;
  --shadow: 0 18px 48px rgba(20, 20, 20, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font-family:
    NanumSquare, Pretendard, Inter, -apple-system, BlinkMacSystemFont,
    "Apple SD Gothic Neo", sans-serif;
  word-break: keep-all;
}

::selection {
  background: var(--accent);
  color: var(--paper);
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input {
  font: inherit;
}

.shell {
  width: min(var(--page-max), calc(100% - (var(--page-gutter) * 2)));
  margin: 0 auto;
  padding: 14px 0 0;
}

.topbar {
  position: sticky;
  top: 14px;
  z-index: 50;
  display: flex;
  width: 100%;
  margin: 0 auto;
  min-height: 66px;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border: 1px solid rgba(229, 229, 229, 0.85);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 8px 30px rgba(20, 20, 20, 0.08);
  backdrop-filter: saturate(160%) blur(18px);
  -webkit-backdrop-filter: saturate(160%) blur(18px);
  padding: 11px 18px;
}

.brand,
.topbar-actions,
.ghost-link,
.private-badge {
  display: inline-flex;
  align-items: center;
}

.brand {
  gap: 10px;
  min-width: 0;
  color: var(--ink);
  font-size: 13.5px;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.brand-mark {
  width: 36px;
  height: 36px;
  flex: 0 0 auto;
  display: block;
}

.topbar-actions {
  gap: 8px;
}

.topnav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.topnav a {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  border-radius: 999px;
  color: var(--dim);
  font-size: 13.5px;
  font-weight: 900;
  padding: 0 13px;
}

.topnav a:hover {
  background: var(--mist);
  color: var(--ink);
}

.private-badge {
  min-height: 36px;
  border-radius: 999px;
  background: var(--dark);
  color: var(--lime);
  padding: 0 13px;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.ghost-link {
  min-height: 36px;
  border-radius: 999px;
  color: var(--ink);
  padding: 0 13px;
  font-size: 13px;
  font-weight: 800;
}

.ghost-link:hover {
  background: var(--mist);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 344px;
  gap: 32px;
  align-items: stretch;
  padding: 88px 0 62px;
  border-bottom: 1px solid var(--line);
}

.hero-copy {
  display: flex;
  min-width: 0;
  flex-direction: column;
  justify-content: center;
}

.eyebrow {
  margin: 0 0 20px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.3em;
  text-transform: uppercase;
}

h1 {
  max-width: 760px;
  margin: 0;
  color: var(--dark);
  font-family: NanumSquareExtraBold, NanumSquare, Pretendard, sans-serif;
  font-size: clamp(3.6rem, 9vw, 7rem);
  font-weight: 400;
  line-height: 0.98;
  letter-spacing: -0.04em;
}

.lede {
  max-width: 660px;
  margin: 24px 0 0;
  color: var(--dim);
  font-size: clamp(1rem, 1.7vw, 1.18rem);
  line-height: 1.6;
}

.signal-panel {
  position: relative;
  display: flex;
  min-width: 0;
  flex-direction: column;
  justify-content: space-between;
  border-radius: 24px;
  background: var(--dark);
  color: var(--paper);
  padding: 24px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.signal-ring {
  position: relative;
  z-index: 1;
  display: grid;
  min-height: 198px;
  place-items: center;
  align-content: center;
  overflow: hidden;
  border: 1px solid rgba(212, 255, 0, 0.16);
  border-radius: 18px;
  background:
    linear-gradient(135deg, rgba(107, 63, 246, 0.2), transparent 58%),
    var(--dark);
}

.pulse {
  position: absolute;
  width: 118px;
  height: 118px;
  border: 2px solid rgba(212, 255, 0, 0.42);
  border-radius: 999px;
  animation: pulse 2.5s ease-in-out infinite;
}

.signal-ring strong {
  z-index: 1;
  color: var(--lime);
  font-size: 2.15rem;
  font-weight: 900;
  line-height: 1;
}

.signal-ring small {
  z-index: 1;
  margin-top: 8px;
  color: rgba(255, 255, 255, 0.7);
}

.signal-meta {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 18px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 13px;
}

.signal-meta button {
  min-height: 40px;
  border: 0;
  border-radius: 999px;
  background: var(--lime);
  color: var(--dark);
  cursor: pointer;
  font-weight: 900;
  padding: 0 18px;
}

.center-metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  padding: 24px 0 0;
}

.center-metrics article {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper);
  padding: 18px;
}

.center-metrics span {
  color: var(--dim2);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.center-metrics strong {
  display: block;
  margin-top: 10px;
  color: var(--ink);
  font-family: NanumSquareExtraBold, NanumSquare, Pretendard, sans-serif;
  font-size: 2rem;
  font-weight: 400;
  line-height: 1;
}

.center-metrics small {
  display: block;
  margin-top: 8px;
  color: var(--dim);
  font-size: 12px;
  line-height: 1.45;
}

.catalog-head {
  padding-top: 78px;
}

.toolbar {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  margin: 28px 0 18px;
}

.tabs {
  display: inline-flex;
  gap: 4px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--mist);
  padding: 4px;
}

.tab {
  min-height: 36px;
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: var(--dim);
  cursor: pointer;
  font-size: 13px;
  font-weight: 800;
  padding: 0 14px;
  transition:
    color 0.15s,
    background 0.15s,
    box-shadow 0.15s;
}

.tab.active {
  background: var(--paper);
  box-shadow: 0 1px 3px rgba(20, 20, 20, 0.1);
  color: var(--ink);
}

.search {
  display: flex;
  min-width: min(320px, 100%);
  align-items: center;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper);
  padding: 0 16px;
}

.search span {
  color: var(--dim);
  font-size: 13px;
  font-weight: 700;
}

.search input {
  width: 100%;
  min-height: 42px;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink);
}

.search:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(107, 63, 246, 0.14);
}

.grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.api-card {
  display: flex;
  min-height: 278px;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper);
  padding: 24px;
  transition:
    border-color 0.16s,
    background 0.16s,
    transform 0.16s;
}

.api-card:hover {
  border-color: var(--accent);
  background: rgba(107, 63, 246, 0.04);
  transform: translateY(-2px);
}

.api-card[hidden] {
  display: none;
}

.card-top,
.meta,
.actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.mark {
  display: flex;
  position: relative;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  border-radius: 14px;
  background: var(--accent);
  color: var(--paper);
  font-weight: 900;
  line-height: 1;
  overflow: hidden;
}

.mark::before {
  content: "";
  display: none;
  position: absolute;
  top: 50%;
  left: 50%;
  width: 31px;
  height: 31px;
  background-image: var(--logo);
  background-position: center;
  background-repeat: no-repeat;
  background-size: contain;
  transform: translate(-50%, -50%);
}

.spotify,
.youtube,
.melon,
.bugs,
.genie,
.amazon,
.amazon-music,
.amazon-digital,
.amazon-cd,
.digital,
.itunes,
.itunes-digital,
.vinyl,
.iheartradio {
  border: 1px solid var(--line);
  background: var(--paper);
  color: transparent;
  font-size: 0;
}

.spotify::before,
.youtube::before,
.melon::before,
.bugs::before,
.genie::before,
.amazon::before,
.amazon-music::before,
.amazon-digital::before,
.amazon-cd::before,
.digital::before,
.itunes::before,
.itunes-digital::before,
.vinyl::before,
.iheartradio::before {
  display: block;
}

.spotify {
  --logo: url("/assets/platforms/spotify.svg");
}

.youtube {
  --logo: url("/assets/platforms/youtube.svg");
}

.melon {
  --logo: url("/assets/platforms/melon.svg");
}

.bugs {
  --logo: url("/assets/platforms/bugs.svg");
}

.genie {
  --logo: url("/assets/platforms/genie.svg");
}

.itunes,
.itunes-digital {
  --logo: url("/assets/platforms/itunes.svg");
}

.amazon,
.amazon-music {
  --logo: url("/assets/platforms/amazon_music.svg");
}

.digital,
.amazon-digital,
.vinyl,
.amazon-cd {
  --logo: url("/assets/platforms/amazon_store.svg");
}

.iheartradio {
  --logo: url("/assets/platforms/iheartradio.svg");
}

.status {
  max-width: 112px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 10px;
  color: var(--dim);
  font-size: 12px;
  font-weight: 900;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.status.ok {
  border-color: var(--dark);
  background: var(--dark);
  color: var(--lime);
}

.status.fail {
  border-color: rgba(192, 51, 44, 0.22);
  background: rgba(192, 51, 44, 0.1);
  color: #c0332c;
}

.status.auth {
  border-color: rgba(107, 63, 246, 0.28);
  background: var(--accent-soft);
  color: var(--accent);
}

.api-card h2 {
  margin: 24px 0 10px;
  color: var(--ink);
  font-family: NanumSquareExtraBold, NanumSquare, Pretendard, sans-serif;
  font-size: 1.18rem;
  font-weight: 400;
  letter-spacing: -0.02em;
}

.api-card p {
  margin: 0;
  color: var(--dim);
  font-size: 15px;
  line-height: 1.58;
}

.meta {
  flex-wrap: wrap;
  margin-top: auto;
  padding-top: 24px;
  color: var(--dim2);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

.actions {
  justify-content: flex-start;
  margin-top: 14px;
}

.actions a {
  min-height: 36px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper);
  color: var(--ink);
  font-size: 13px;
  font-weight: 800;
  padding: 8px 14px;
  transition:
    border-color 0.15s,
    color 0.15s,
    transform 0.15s;
}

.actions a:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

.guide-section,
.reference-section,
.status-section,
.release-section {
  padding: 82px 0 0;
}

.section-head {
  max-width: 760px;
  margin-bottom: 24px;
}

.section-head h2,
.docs-band h2 {
  margin: 0;
  color: var(--ink);
  font-family: NanumSquareExtraBold, NanumSquare, Pretendard, sans-serif;
  font-size: clamp(2rem, 4.4vw, 3rem);
  font-weight: 400;
  line-height: 1.14;
  letter-spacing: -0.035em;
}

.section-head p,
.docs-band p {
  margin: 16px 0 0;
  color: var(--dim);
  font-size: 16px;
  line-height: 1.65;
}

.section-head.compact {
  margin-bottom: 18px;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.guide-card,
.snippet-card {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper);
  padding: 24px;
}

.guide-index {
  display: inline-flex;
  min-height: 30px;
  align-items: center;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 12px;
  font-weight: 900;
  padding: 0 11px;
}

.guide-card h3,
.snippet-card h3 {
  margin: 18px 0 10px;
  color: var(--ink);
  font-family: NanumSquareExtraBold, NanumSquare, Pretendard, sans-serif;
  font-size: 1.1rem;
  font-weight: 400;
}

.guide-card p {
  margin: 0;
  color: var(--dim);
  font-size: 15px;
  line-height: 1.6;
}

.status-table {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper);
}

.status-row {
  display: grid;
  grid-template-columns: minmax(180px, 1.2fr) minmax(180px, 1fr) 120px 80px 84px;
  gap: 16px;
  align-items: center;
  padding: 16px 20px;
  color: var(--dim);
  font-size: 14px;
}

.status-row + .status-row {
  border-top: 1px solid var(--line);
}

.status-row.head {
  background: var(--mist);
  color: var(--dim2);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.status-row strong {
  color: var(--ink);
  font-weight: 900;
}

.status-row code {
  width: fit-content;
}

.status-row a {
  color: var(--accent);
  font-size: 13px;
  font-weight: 900;
}

.docs-band {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(340px, 1.05fr);
  gap: 32px;
  align-items: start;
  margin-top: 72px;
  border-radius: 24px;
  background: var(--dark);
  color: var(--paper);
  padding: 36px;
}

.docs-band .eyebrow {
  color: var(--lime);
}

.docs-band h2 {
  color: var(--paper);
}

.docs-band p {
  color: rgba(255, 255, 255, 0.7);
}

code {
  border-radius: 6px;
  background: rgba(107, 63, 246, 0.1);
  color: var(--accent);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.92em;
  padding: 0.12em 0.34em;
}

.docs-band code {
  background: rgba(212, 255, 0, 0.12);
  color: var(--lime);
}

.release-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.release-card {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper);
  padding: 24px;
}

.release-card time {
  color: var(--accent);
  font-size: 12px;
  font-weight: 900;
}

.release-card h3 {
  margin: 14px 0 10px;
  color: var(--ink);
  font-family: NanumSquareExtraBold, NanumSquare, Pretendard, sans-serif;
  font-size: 1.12rem;
  font-weight: 400;
}

.release-card p {
  margin: 0;
  color: var(--dim);
  font-size: 14.5px;
  line-height: 1.6;
}

.rules-list {
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 16px;
}

.rule-row {
  display: grid;
  grid-template-columns: 112px minmax(0, 1fr);
  gap: 18px;
  padding: 18px 20px;
}

.rule-row + .rule-row {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.rule-row strong {
  color: var(--lime);
  font-size: 13px;
}

.rule-row span {
  color: rgba(255, 255, 255, 0.76);
  font-size: 14px;
  line-height: 1.55;
}

.reference-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.snippet-card pre {
  max-width: 100%;
  margin: 14px 0 0;
  overflow-x: auto;
  border-radius: 14px;
  background: var(--dark);
  color: var(--paper);
  padding: 16px;
}

.snippet-card code {
  display: block;
  min-width: 0;
  background: transparent;
  color: rgba(255, 255, 255, 0.86);
  font-size: 12.5px;
  line-height: 1.65;
  padding: 0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.showcase-shell {
  padding-bottom: 80px;
}

.showcase-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(340px, 0.68fr);
  gap: 24px;
  align-items: stretch;
  padding: 58px 0 28px;
}

.showcase-copy,
.showcase-panel {
  min-width: 0;
  border-radius: 24px;
}

.showcase-copy {
  background: var(--dark);
  color: var(--paper);
  padding: 44px;
}

.showcase-copy .eyebrow {
  color: var(--lime);
}

.showcase-copy h1 {
  max-width: 860px;
  color: var(--paper);
  font-size: clamp(3rem, 7vw, 5.8rem);
}

.showcase-copy p {
  max-width: 720px;
  margin: 22px 0 0;
  color: rgba(255, 255, 255, 0.72);
  font-size: 17px;
  line-height: 1.68;
}

.showcase-copy code {
  background: rgba(212, 255, 0, 0.12);
  color: var(--lime);
}

.showcase-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 30px;
}

.showcase-actions a {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 900;
  padding: 0 16px;
}

.showcase-actions a:first-child {
  background: var(--lime);
  color: var(--dark);
}

.showcase-actions a:last-child {
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: var(--paper);
}

.showcase-panel {
  display: grid;
  align-content: stretch;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--paper);
}

.showcase-panel-row {
  display: grid;
  grid-template-columns: 112px minmax(0, 1fr);
  gap: 18px;
  align-items: center;
  padding: 22px 24px;
}

.showcase-panel-row + .showcase-panel-row {
  border-top: 1px solid var(--line);
}

.showcase-panel-row span {
  color: var(--dim2);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.showcase-panel-row code {
  width: fit-content;
  max-width: 100%;
  overflow-wrap: anywhere;
}

.showcase-panel-row strong {
  color: var(--ink);
  font-size: 15px;
  font-weight: 900;
}

.showcase-metrics,
.showcase-route-grid,
.showcase-example-grid {
  display: grid;
  gap: 16px;
}

.showcase-metrics {
  grid-template-columns: 1.3fr 0.7fr 0.7fr;
  padding-top: 18px;
}

.showcase-metrics article,
.showcase-route-grid article,
.showcase-example-grid article {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper);
  padding: 24px;
}

.showcase-metrics span,
.showcase-route-grid span {
  display: block;
  color: var(--dim2);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.showcase-metrics strong {
  display: block;
  margin-top: 10px;
  color: var(--ink);
  font-family: NanumSquareExtraBold, NanumSquare, Pretendard, sans-serif;
  font-size: clamp(1.6rem, 3vw, 2.35rem);
  font-weight: 400;
  line-height: 1;
}

.showcase-metrics small {
  display: block;
  margin-top: 9px;
  color: var(--dim);
  font-size: 13px;
  line-height: 1.45;
}

.showcase-section {
  padding-top: 72px;
}

.showcase-route-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.showcase-route-grid h3,
.showcase-example-grid h3 {
  margin: 14px 0 12px;
  color: var(--ink);
  font-family: NanumSquareExtraBold, NanumSquare, Pretendard, sans-serif;
  font-size: 1.22rem;
  font-weight: 400;
}

.showcase-route-grid p {
  min-height: 68px;
  margin: 14px 0 18px;
  color: var(--dim);
  font-size: 14.5px;
  line-height: 1.6;
}

.showcase-route-grid a {
  color: var(--accent);
  font-size: 13px;
  font-weight: 900;
}

.showcase-example-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.showcase-example-grid pre {
  max-width: 100%;
  margin: 14px 0 0;
  overflow-x: auto;
  border-radius: 14px;
  background: var(--dark);
  padding: 16px;
}

.showcase-example-grid code {
  display: block;
  min-width: 0;
  background: transparent;
  color: rgba(255, 255, 255, 0.86);
  font-size: 12.5px;
  line-height: 1.65;
  padding: 0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.api-footer {
  margin-top: 96px;
  width: 100vw;
  margin-left: calc(50% - 50vw);
  margin-right: calc(50% - 50vw);
  border-top: 1px solid var(--line);
  background: var(--mist);
}

.api-footer-inner {
  width: min(var(--page-max), calc(100% - (var(--page-gutter) * 2)));
  margin: 0 auto;
  padding: 42px 0 72px;
}

.api-footer-company {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 32px;
  padding-bottom: 34px;
  border-bottom: 1px solid var(--line);
}

.api-footer-identity {
  display: grid;
  gap: 7px;
  color: var(--dim2);
  font-size: 13px;
  line-height: 1.45;
}

.api-footer-identity strong {
  color: var(--dim);
  font-size: 13.5px;
  font-weight: 900;
}

.api-footer-identity a,
.api-footer-legal a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.15s;
}

.api-footer-identity a:hover,
.api-footer-legal a:hover {
  color: var(--ink);
}

.api-footer-social {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-top: 12px;
}

.api-footer-social a {
  display: inline-flex;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--dim);
  background: rgba(255, 255, 255, 0.48);
  transition:
    border-color 0.15s,
    color 0.15s,
    background 0.15s;
}

.api-footer-social a:hover {
  border-color: var(--ink);
  color: var(--ink);
  background: var(--paper);
}

.api-footer-social svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.api-footer-relco {
  position: relative;
  flex: 0 0 auto;
  color: var(--dim);
  font-size: 12.5px;
}

.api-footer-relco summary {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.42);
  cursor: pointer;
  list-style: none;
  padding: 0 20px;
  font-weight: 900;
  user-select: none;
  transition:
    border-color 0.15s,
    color 0.15s,
    background 0.15s;
}

.api-footer-relco summary::-webkit-details-marker {
  display: none;
}

.api-footer-relco summary:hover {
  border-color: var(--ink);
  color: var(--ink);
  background: var(--paper);
}

.api-footer-relco summary svg {
  width: 13px;
  height: 13px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform 0.15s;
}

.api-footer-relco[open] summary svg {
  transform: rotate(180deg);
}

.api-footer-relco-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 20;
  min-width: 220px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper);
  box-shadow: var(--shadow);
  padding: 6px;
}

.api-footer-relco-menu a {
  display: block;
  border-radius: 10px;
  color: var(--dim);
  font-size: 13px;
  font-weight: 800;
  padding: 10px 12px;
}

.api-footer-relco-menu a:hover {
  background: var(--mist);
  color: var(--ink);
}

.api-footer-legal {
  display: grid;
  gap: 16px;
  padding-top: 28px;
  color: var(--dim2);
  font-size: 12.5px;
  line-height: 1.7;
}

.api-footer-legal p {
  margin: 0;
}

.api-footer-legal strong {
  color: var(--dim);
  font-weight: 900;
}

.doc-shell {
  padding-bottom: 0;
}

.crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  align-items: center;
  margin: 34px 0 0;
  color: var(--dim);
  font-size: 13px;
  font-weight: 800;
}

.crumbs a:hover {
  color: var(--accent);
}

.crumbs strong {
  color: var(--ink);
}

.doc-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 24px;
  align-items: end;
  padding: 64px 0 48px;
  border-bottom: 1px solid var(--line);
}

.doc-hero.index {
  grid-template-columns: 1fr;
}

.doc-hero h1 {
  font-size: clamp(3.3rem, 8vw, 6.5rem);
}

.doc-hero p {
  max-width: 760px;
  margin: 22px 0 0;
  color: var(--dim);
  font-size: 17px;
  line-height: 1.65;
}

.doc-summary {
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--paper);
  padding: 22px;
}

.doc-summary .mark {
  margin-bottom: 20px;
}

.doc-summary dl,
.doc-summary dt,
.doc-summary dd {
  margin: 0;
}

.doc-summary dl {
  display: grid;
  gap: 14px;
}

.doc-summary div {
  display: grid;
  gap: 5px;
}

.doc-summary dt {
  color: var(--dim2);
  font-size: 11px;
  font-weight: 900;
  text-transform: uppercase;
}

.doc-summary dd,
.doc-summary a {
  color: var(--ink);
  font-size: 14px;
  font-weight: 800;
}

.doc-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 36px;
  padding-top: 34px;
}

.doc-rail {
  position: sticky;
  top: 96px;
  display: grid;
  align-self: start;
  gap: 4px;
}

.doc-rail a {
  border-radius: 9px;
  color: var(--dim);
  font-size: 13.5px;
  font-weight: 800;
  padding: 9px 12px;
}

.doc-rail a:hover {
  background: var(--accent-soft);
  color: var(--ink);
}

.doc-content {
  display: grid;
  min-width: 0;
  gap: 18px;
}

.doc-card {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper);
  padding: 28px;
}

.doc-card h2 {
  margin: 0;
  font-family: NanumSquareExtraBold, NanumSquare, Pretendard, sans-serif;
  font-size: clamp(1.65rem, 3vw, 2.2rem);
  font-weight: 400;
  letter-spacing: -0.03em;
}

.doc-card p {
  margin: 14px 0 0;
  color: var(--dim);
  font-size: 15.5px;
  line-height: 1.7;
}

.doc-card.wide {
  padding: 0;
  overflow: hidden;
}

.doc-card.wide > .eyebrow,
.doc-card.wide > h2 {
  margin-left: 28px;
  margin-right: 28px;
}

.doc-card.wide > .eyebrow {
  margin-top: 28px;
}

.endpoint-list {
  display: grid;
  margin-top: 24px;
}

.endpoint-row {
  display: grid;
  gap: 8px;
  padding: 18px 28px;
  border-top: 1px solid var(--line);
}

.endpoint-main {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 10px;
}

.endpoint-main code {
  min-width: 0;
  overflow-wrap: anywhere;
}

.method {
  display: inline-flex;
  min-width: 48px;
  justify-content: center;
  border-radius: 999px;
  background: var(--dark);
  color: var(--lime);
  font-size: 11px;
  font-weight: 900;
  padding: 5px 8px;
}

.endpoint-row p {
  margin: 0;
  color: var(--dim);
  font-size: 14px;
}

.param-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.param-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--dim);
  font-size: 12px;
  font-weight: 800;
  padding: 5px 9px;
}

.param-pill b {
  color: var(--accent);
  font-size: 10px;
  text-transform: uppercase;
}

.muted {
  color: var(--dim2);
  font-size: 12px;
}

.rules-list.light {
  margin-top: 18px;
  border-color: var(--line);
}

.rules-list.light .rule-row {
  border-color: var(--line);
}

.rules-list.light .rule-row strong {
  color: var(--accent);
}

.rules-list.light .rule-row span {
  color: var(--dim);
}

.snippet-stack {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.snippet-stack pre {
  max-width: 100%;
  overflow-x: auto;
  border-radius: 14px;
  background: var(--dark);
  color: var(--paper);
  padding: 16px;
}

.snippet-stack code {
  display: block;
  min-width: 0;
  background: transparent;
  color: rgba(255, 255, 255, 0.86);
  font-size: 12.5px;
  line-height: 1.65;
  padding: 0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.doc-list {
  margin: 18px 0 0;
  padding-left: 20px;
  color: var(--dim);
  line-height: 1.75;
}

.doc-index-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  padding-top: 28px;
}

.doc-index-card {
  display: flex;
  min-width: 0;
  gap: 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper);
  padding: 24px;
}

.doc-index-card h2 {
  margin: 0;
  font-family: NanumSquareExtraBold, NanumSquare, Pretendard, sans-serif;
  font-size: 1.22rem;
  font-weight: 400;
}

.doc-index-card p {
  margin: 8px 0 16px;
  color: var(--dim);
  font-size: 14px;
  line-height: 1.6;
}

.doc-index-card a {
  color: var(--accent);
  font-size: 13px;
  font-weight: 900;
}

.signal-meta button:hover,
.tab:hover {
  transform: translateY(-1px);
}

@keyframes pulse {
  0% {
    transform: scale(0.76);
    opacity: 0.9;
  }
  70% {
    transform: scale(1.24);
    opacity: 0.08;
  }
  100% {
    transform: scale(1.24);
    opacity: 0;
  }
}

@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .topbar {
    background: rgba(255, 255, 255, 0.96);
  }
}

@media (min-width: 1024px) {
  :root {
    --page-max: 1256px;
    --page-gutter: 32px;
  }

  .shell,
  .api-footer-inner {
    width: min(var(--page-max), calc(100% - (var(--page-gutter) * 2)));
  }
}

@media (max-width: 1100px) {
  .grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .topnav {
    display: none;
  }

  .status-row {
    grid-template-columns: minmax(170px, 1fr) minmax(160px, 1fr) 96px 64px 72px;
  }

  .api-footer-company {
    gap: 24px;
  }
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    padding-top: 56px;
  }

  .topbar {
    flex-wrap: wrap;
  }

  .topnav {
    order: 3;
    display: flex;
    width: 100%;
    justify-content: flex-start;
    overflow-x: auto;
    border-top: 1px solid var(--line);
    padding-top: 8px;
    scrollbar-width: none;
  }

  .topnav::-webkit-scrollbar {
    display: none;
  }

  .topnav a {
    flex: 0 0 auto;
  }

  .grid,
  .center-metrics,
  .guide-grid,
  .reference-grid,
  .release-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .docs-band {
    grid-template-columns: 1fr;
  }

  .doc-hero,
  .doc-layout,
  .showcase-hero {
    grid-template-columns: 1fr;
  }

  .showcase-metrics,
  .showcase-route-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .doc-rail {
    position: static;
    display: flex;
    overflow-x: auto;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--mist);
    padding: 4px;
    scrollbar-width: none;
  }

  .doc-rail::-webkit-scrollbar {
    display: none;
  }

  .doc-rail a {
    flex: 0 0 auto;
    white-space: nowrap;
  }

  .api-footer-company {
    flex-direction: column;
  }

  .api-footer-relco {
    align-self: flex-start;
  }

  .api-footer-relco-menu {
    right: auto;
    left: 0;
  }

  .status-table {
    overflow-x: auto;
  }

  .status-row {
    min-width: 760px;
  }
}

@media (max-width: 680px) {
  :root {
    --page-gutter: 12px;
  }

  .shell {
    padding-top: 8px;
  }

  .api-footer-inner {
    padding: 42px 0 34px;
  }

  .topbar {
    top: 8px;
    min-height: 56px;
  }

  .brand span:last-child {
    max-width: 168px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .private-badge {
    display: none;
  }

  .hero {
    padding: 44px 0 36px;
  }

  h1 {
    font-size: clamp(3rem, 17vw, 4.5rem);
  }

  .signal-panel {
    border-radius: 20px;
  }

  .toolbar {
    flex-direction: column;
  }

  .tabs {
    overflow-x: auto;
    scrollbar-width: none;
  }

  .tabs::-webkit-scrollbar {
    display: none;
  }

  .tab {
    white-space: nowrap;
  }

  .search {
    min-width: 0;
  }

  .grid,
  .center-metrics,
  .guide-grid,
  .reference-grid,
  .release-grid,
  .showcase-metrics,
  .showcase-route-grid,
  .showcase-example-grid {
    grid-template-columns: 1fr;
  }

  .api-footer-company {
    padding-bottom: 28px;
  }

  .api-footer-legal {
    gap: 14px;
    font-size: 12px;
  }

  .catalog-head,
  .guide-section,
  .reference-section,
  .status-section,
  .release-section,
  .showcase-section {
    padding-top: 52px;
  }

  .showcase-hero {
    padding-top: 42px;
  }

  .showcase-copy {
    padding: 28px;
  }

  .showcase-panel-row {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 18px 20px;
  }

  .center-metrics article {
    padding: 16px;
  }

  .center-metrics strong {
    font-size: 1.7rem;
  }

  .docs-band {
    margin-top: 52px;
    border-radius: 20px;
    padding: 24px;
  }

  .rule-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .doc-hero {
    padding: 42px 0 34px;
  }

  .doc-summary,
  .doc-card,
  .doc-index-card {
    padding: 20px;
  }

  .doc-index-grid {
    grid-template-columns: 1fr;
  }

  .doc-index-card {
    flex-direction: column;
  }

  .endpoint-row {
    padding: 16px 20px;
  }

  .endpoint-main {
    align-items: flex-start;
    flex-direction: column;
  }
}