:root {
  --bg: #ffffff;
  --ink: #111111;
  --muted: rgba(17, 17, 17, 0.62);
  --line: rgba(17, 17, 17, 0.16);
  --content-width: min(1320px, calc(100vw - 40px));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Noto Sans KR", "Noto Sans", sans-serif;
  font-size: 14px;
  line-height: 1.6;
}

.track {
  font-family: "Helvetica Neue", Helvetica, "Noto Sans", sans-serif;
}

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

.archive-table td:nth-child(3) > a,
.detail-header h1 {
  font-weight: 700;
}

.archive-table td:nth-child(3) .cell-sub,
.archive-intro .cell-sub {
  font-weight: 400;
}

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

.archive-shell,
.detail-shell {
  width: var(--content-width);
  margin: 0 auto;
  padding: 18px 0 48px;
}

.eyebrow,
.contact-list span {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.archive-header,
.detail-header,
.archive-meta,
.archive-copy,
.archive-filters,
.archive-evidence,
.archive-table-wrap,
.archive-method,
.detail-case-study,
.detail-loops,
.detail-hero,
.detail-table-wrap,
.track-section,
.detail-related,
.contact-footer {
  border-top: 1px solid var(--line);
  padding-top: 12px;
  margin-top: 18px;
}

.archive-header h1,
.detail-header h1 {
  margin: 4px 0 0;
  font-size: 24px;
  line-height: 1.3;
  font-weight: 500;
}

.archive-intro,
.archive-meta p,
.contact-footer p,
.contact-list a,
.detail-related a {
  color: var(--muted);
}

.track-callout,
.signal-line,
.privacy-note {
  margin: 12px 0 0;
}

.track-callout {
  padding: 10px 12px;
  border: 1px solid var(--line);
}

.track-callout a,
.signal-line {
  color: var(--ink);
  font-weight: 700;
}

.track-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  border-top: 1px solid var(--line);
  padding-top: 12px;
  margin-top: 18px;
}

.track-nav a {
  border: 1px solid var(--line);
  padding: 6px 10px;
}

.track-nav a:hover {
  background: var(--ink);
  color: var(--bg);
}

.track-header {
  padding-bottom: 2px;
}

.track-header h1 {
  max-width: 980px;
  font-size: clamp(28px, 4vw, 52px);
  line-height: 0.98;
  letter-spacing: -0.055em;
}

.track-header .archive-intro {
  max-width: 820px;
  font-size: 15px;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.hero-actions {
  margin-top: 12px;
}

.cta-row a {
  border: 1px solid var(--line);
  padding: 7px 11px;
  font-weight: 700;
}

.cta-row a:hover {
  background: var(--ink);
  color: var(--bg);
}

.workflow-strip {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
  margin-top: 8px;
}

.workflow-strip span {
  border: 1px solid var(--line);
  padding: 10px;
}

.workflow-strip span:not(:last-child)::after {
  content: " ->";
  color: var(--muted);
}

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

.cell-sub {
  display: block;
  margin-top: 2px;
  color: var(--muted);
}

.archive-meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.archive-copy,
.archive-method {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.archive-statement {
  color: var(--ink);
}

.archive-evidence {
  display: block;
}

.evidence-list {
  margin-top: 8px;
}

.evidence-item {
  display: grid;
  grid-template-columns: 48px minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.evidence-item h3,
.evidence-item p,
.method-list,
.capability-list {
  margin: 0;
}

.evidence-item h3 {
  font-size: 14px;
  font-weight: 700;
}

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

.method-list,
.capability-list {
  padding-left: 18px;
}

.method-list li,
.capability-list li {
  padding: 3px 0;
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.filter-chip {
  appearance: none;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  padding: 6px 10px;
  cursor: pointer;
  font: inherit;
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease;
}

.filter-chip:hover,
.filter-chip.is-active {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}

.archive-table,
.detail-table {
  width: 100%;
  border-collapse: collapse;
}

.archive-table th,
.archive-table td,
.detail-table th,
.detail-table td {
  padding: 10px 10px 10px 0;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  text-align: left;
}

.archive-table thead th,
.detail-table th {
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.proof-table th {
  width: 190px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  text-transform: none;
}

.archive-table tr.is-hidden {
  display: none;
}

.archive-table tbody tr {
  transition: background-color 160ms ease, color 160ms ease;
}

.track .detail-table tbody tr {
  transition: background-color 120ms ease, color 120ms ease;
}

.archive-table tbody tr:hover {
  background: var(--ink);
  color: var(--bg);
}

.track .detail-table tbody tr:hover {
  background: var(--ink);
  color: var(--bg);
}

.archive-table tbody tr:hover td,
.archive-table tbody tr:hover a,
.archive-table tbody tr:hover .cell-sub,
.track .detail-table tbody tr:hover th,
.track .detail-table tbody tr:hover td,
.track .detail-table tbody tr:hover a {
  color: var(--bg);
}

.archive-table td:nth-child(1),
.archive-table td:nth-child(2),
.archive-table th:nth-child(1),
.archive-table th:nth-child(2) {
  width: 64px;
}

.archive-table td:nth-child(5),
.archive-table td:nth-child(6) {
  color: var(--muted);
}

.detail-hero img {
  width: 100%;
  border: 1px solid var(--line);
}

.case-study-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(280px, 1fr);
  gap: 24px;
}

.case-study-intro h2,
.case-study-metric p,
.loop-panel h3,
.contact-footer h2 {
  margin: 0;
}

.case-study-metric {
  padding: 12px 14px;
  border: 1px solid var(--line);
}

.loop-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 8px;
}

.loop-panel {
  border: 1px solid var(--line);
  padding: 12px;
}

.loop-hypothesis {
  margin: 8px 0 12px;
  color: var(--muted);
}

.detail-related ul,
.contact-list {
  list-style: none;
  padding: 0;
  margin: 8px 0 0;
}

.detail-related li,
.contact-list li {
  padding: 6px 0;
  border-bottom: 1px solid var(--line);
}

.contact-list li {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 12px;
}

.case-browser {
  display: grid;
  grid-template-columns: minmax(300px, 0.38fr) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.case-list {
  border-top: 1px solid var(--line);
  overflow: hidden;
}

.case-row {
  width: calc(100% + 24px);
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  margin-left: -12px;
  padding: 12px;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.case-row span {
  color: var(--muted);
}

.case-row strong,
.case-row em {
  display: block;
}

.case-row strong {
  font-size: 14px;
  line-height: 1.35;
}

.case-row em {
  margin-top: 2px;
  color: var(--muted);
  font-style: normal;
  font-size: 12px;
  line-height: 1.45;
}

.case-row:hover,
.case-row.is-active {
  background: var(--ink);
  color: var(--bg);
}

.case-row:hover span,
.case-row:hover em,
.case-row.is-active span,
.case-row.is-active em {
  color: var(--bg);
}

.case-detail-panel {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  min-height: 520px;
  padding: 0 0 18px;
  position: sticky;
  top: 18px;
}

.case-detail {
  display: none;
}

.case-detail.is-active {
  display: block;
}

.case-detail h2 {
  margin: 4px 0 10px;
  max-width: 760px;
  font-size: clamp(24px, 3vw, 38px);
  line-height: 1;
  letter-spacing: -0.045em;
}

.case-facts {
  margin: 20px 0 0;
  border-top: 1px solid var(--line);
}

.case-facts div {
  display: grid;
  grid-template-columns: minmax(150px, 0.32fr) minmax(0, 1fr);
  gap: 14px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.case-facts dt {
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.case-facts dd {
  margin: 0;
}

.case-source-table {
  margin-top: 18px;
}

.case-source-table th {
  width: 170px;
}

.case-source-table td {
  color: var(--muted);
}

.inline-detail-link {
  display: inline-block;
  margin-top: 14px;
  border-bottom: 1px solid var(--ink);
  font-weight: 700;
}

@media (max-width: 840px) {
  .archive-meta {
    grid-template-columns: 1fr;
  }

  .archive-copy,
  .archive-method,
  .evidence-item,
  .case-study-intro,
  .loop-grid,
  .workflow-strip,
  .case-browser,
  .case-facts div {
    grid-template-columns: 1fr;
  }

  .case-detail-panel {
    min-height: 0;
    position: static;
  }

  .track-nav,
  .cta-row {
    flex-direction: column;
  }

  .track-header h1 {
    letter-spacing: -0.04em;
  }

  .archive-shell,
  .detail-shell {
    width: min(100vw - 20px, 100%);
  }

  .archive-table,
  .archive-table thead,
  .archive-table tbody,
  .archive-table tr,
  .archive-table th,
  .archive-table td {
    display: block;
  }

  .archive-table thead {
    display: none;
  }

  .archive-table tr {
    padding: 10px 0;
    border-bottom: 1px solid var(--line);
  }

  .archive-table td {
    border: 0;
    padding: 2px 0;
  }

  .contact-list li {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}