.page-about {
  --rail-line: rgba(226, 214, 190, 0.18);
  --rail-line-end: rgba(184, 241, 74, 0.32);
  background: var(--ink);
  color: var(--ice);
  overflow-x: hidden;
}

.page-about .about-crumb {
  padding-top: calc(var(--header-h) + 20px);
  padding-bottom: 18px;
  border-bottom: 1px solid var(--hairline);
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 13px;
  color: var(--fog);
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--fog);
  opacity: 0.6;
}

.page-about .breadcrumb-item a {
  color: var(--fog);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

.page-about .breadcrumb-item a:hover,
.page-about .breadcrumb-item a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-about .breadcrumb-item[aria-current="page"] {
  color: var(--ice);
}

/* ---------- hero ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  padding: 56px 0 64px;
  border-bottom: 1px solid var(--hairline);
}

.page-about .about-hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.24;
  filter: saturate(0.6) contrast(1.05);
}

.page-about .about-hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(100deg, var(--ink) 4%, rgba(11, 27, 43, 0.82) 52%, rgba(11, 27, 43, 0.42) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -18%;
  right: -12%;
  width: 52%;
  height: 132%;
  background: linear-gradient(152deg, rgba(23, 65, 74, 0.5), transparent 62%);
  transform: skewX(-14deg);
  pointer-events: none;
  z-index: 1;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 2;
}

.page-about .about-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 22px;
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--lime);
  text-transform: uppercase;
}

.page-about .about-eyebrow-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(184, 241, 74, 0.14);
}

.page-about .about-hero h1 {
  margin: 0 0 22px;
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(34px, 7vw, 68px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--paper);
  max-width: 16em;
}

.page-about .about-lead {
  margin: 0 0 40px;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--ice);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--hairline);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-figure {
  background: rgba(18, 22, 28, 0.72);
  padding: 18px 20px;
  min-width: 0;
}

.page-about .about-figure dt {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--fog);
}

.page-about .about-figure dd {
  margin: 0;
  font-size: 26px;
  line-height: 1.1;
  font-weight: 600;
  color: var(--lime);
  letter-spacing: 0.02em;
}

/* ---------- toc ---------- */

.page-about .about-toc {
  position: sticky;
  top: var(--header-h);
  z-index: 20;
  background: rgba(11, 27, 43, 0.94);
  border-bottom: 1px solid var(--hairline);
}

.page-about .about-toc-list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 10px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-toc-list::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc-list a {
  display: inline-block;
  white-space: nowrap;
  padding: 7px 13px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 600;
  color: var(--fog);
  text-decoration: none;
  transition: color 160ms ease, border-color 160ms ease, background 160ms ease;
}

.page-about .about-toc-list a:hover,
.page-about .about-toc-list a:focus-visible {
  color: var(--ice);
  border-color: var(--hairline);
}

.page-about .about-toc-list a[aria-current="true"],
.page-about .about-toc-list a.is-active {
  color: var(--lime);
  border-color: rgba(184, 241, 74, 0.4);
  background: rgba(184, 241, 74, 0.07);
}

/* ---------- section shell ---------- */

.page-about .about-section {
  padding: 68px 0;
  border-bottom: 1px solid var(--hairline-soft);
}

.page-about .about-head {
  margin-bottom: 46px;
  max-width: 70ch;
}

.page-about .about-head h2 {
  margin: 12px 0 16px;
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(26px, 4.4vw, 42px);
  line-height: 1.14;
  letter-spacing: -0.008em;
  color: var(--paper);
}

.page-about .about-head-lead {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ice);
  opacity: 0.9;
}

/* ---------- timeline ---------- */

.page-about .about-rail {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-rail-item {
  position: relative;
  margin-left: 12px;
  padding: 0 0 38px 34px;
  border-left: 1px solid var(--rail-line);
}

.page-about .about-rail-item:last-child {
  padding-bottom: 0;
  border-left-color: var(--rail-line-end);
}

.page-about .about-rail-node {
  position: absolute;
  left: -4.5px;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  box-sizing: border-box;
  background: var(--ink);
  border: 1.5px solid var(--lime);
  box-shadow: 0 0 0 3px rgba(184, 241, 74, 0.08);
}

.page-about .about-rail-item:last-child .about-rail-node {
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(184, 241, 74, 0.16);
}

.page-about .about-rail-card {
  background: var(--slate);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 22px 22px 24px;
  box-shadow: var(--shadow);
  transition: border-color 160ms ease, transform 160ms ease;
}

.page-about .about-rail-item:nth-child(odd) .about-rail-card {
  max-width: 560px;
}

.page-about .about-rail-item:nth-child(even) .about-rail-card {
  max-width: 680px;
}

.page-about .about-rail-card:hover {
  border-color: rgba(184, 241, 74, 0.28);
}

.page-about .about-rail-tag {
  display: inline-block;
  margin: 0 0 12px;
  padding: 3px 9px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--lime);
  border: 1px solid rgba(184, 241, 74, 0.32);
  border-radius: var(--radius);
}

.page-about .about-rail-card h3 {
  margin: 0 0 12px;
  font-family: var(--sans);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-rail-card p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ice);
  opacity: 0.88;
}

/* ---------- team ---------- */

.page-about .about-team-grid {
  display: grid;
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-team-col {
  background: var(--slate);
  padding: 28px 22px 30px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

.page-about .about-team-num {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .about-team-col h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 900;
  line-height: 1.25;
  color: var(--paper);
}

.page-about .about-team-col p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ice);
  opacity: 0.88;
}

.page-about .about-team-out {
  margin-top: auto !important;
  padding-top: 14px;
  border-top: 1px solid var(--hairline);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--fog) !important;
  opacity: 1 !important;
}

/* ---------- flow ---------- */

.page-about .about-flow-layout {
  display: grid;
  gap: 34px;
}

.page-about .about-flow-steps {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.page-about .about-flow-step {
  background: var(--slate);
  border: 1px solid var(--hairline);
  border-left: 2px solid transparent;
  border-radius: var(--radius);
  transition: border-color 160ms ease, background 160ms ease;
}

.page-about .about-flow-step[open] {
  border-left-color: var(--lime);
  background: rgba(30, 42, 56, 0.92);
}

.page-about .about-flow-step summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
  font-family: var(--sans);
  font-size: 16.5px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-flow-step summary::-webkit-details-marker {
  display: none;
}

.page-about .about-flow-step summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -2px;
}

.page-about .about-flow-idx {
  flex: 0 0 auto;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .about-flow-name {
  flex: 1 1 auto;
  min-width: 0;
}

.page-about .about-flow-step summary::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 16px;
  color: var(--fog);
  transition: transform 160ms ease, color 160ms ease;
}

.page-about .about-flow-step[open] summary::after {
  content: "–";
  color: var(--lime);
}

.page-about .about-flow-body {
  padding: 0 20px 20px 51px;
}

.page-about .about-flow-body p {
  margin: 0 0 10px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ice);
  opacity: 0.88;
}

.page-about .about-flow-out {
  margin: 14px 0 0 !important;
  padding-top: 12px;
  border-top: 1px dashed var(--hairline);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--lime) !important;
  opacity: 0.9 !important;
}

.page-about .about-flow-figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-flow-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  filter: saturate(0.62) contrast(1.05);
}

.page-about .about-flow-caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  font-style: italic;
  color: var(--fog);
}

/* ---------- index ---------- */

.page-about .about-index-grid {
  display: grid;
  gap: 16px;
  margin-bottom: 40px;
}

.page-about .about-index-col {
  padding: 24px 22px 26px;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  min-width: 0;
}

.page-about .about-index-col h3 {
  margin: 0 0 6px;
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 900;
  line-height: 1.2;
  color: var(--ink);
}

.page-about .about-index-en {
  margin: 0 0 14px;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--teal);
}

.page-about .about-index-col p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: #22303f;
}

.page-about .about-index-figure {
  margin: 0 0 34px;
}

.page-about .about-index-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  filter: saturate(0.7);
}

.page-about .about-index-caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  font-style: italic;
  color: var(--fog);
}

.page-about .about-index-search {
  padding: 22px 24px 24px;
  border: 1px solid var(--hairline);
  border-left: 2px solid var(--lime);
  border-radius: var(--radius);
  background: rgba(23, 65, 74, 0.24);
}

.page-about .about-index-search-label {
  display: block;
  margin-bottom: 10px;
}

.page-about .about-index-search p {
  margin: 0;
  max-width: 72ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ice);
  opacity: 0.9;
}

/* ---------- ops ---------- */

.page-about .about-ops-layout {
  display: grid;
  gap: 34px;
}

.page-about .about-ops-copy h2 {
  margin: 12px 0 16px;
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(26px, 4.4vw, 42px);
  line-height: 1.14;
  letter-spacing: -0.008em;
  color: var(--paper);
}

.page-about .about-ops-copy p {
  margin: 0 0 14px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ice);
  opacity: 0.9;
}

.page-about .about-ops-note {
  color: var(--fog) !important;
  font-style: italic;
}

.page-about .about-ops-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--hairline);
  min-width: 0;
}

.page-about .about-ops-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--hairline);
}

.page-about .about-ops-label {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--lime);
}

.page-about .about-ops-value {
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--ice);
}

/* ---------- next ---------- */

.page-about .about-next {
  padding: 62px 0 78px;
}

.page-about .about-next h2 {
  margin: 0 0 14px;
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(24px, 3.8vw, 36px);
  line-height: 1.18;
  color: var(--paper);
}

.page-about .about-next p {
  margin: 0 0 26px;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ice);
  opacity: 0.9;
}

.page-about .about-next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-next-actions .btn {
  text-decoration: none;
}

/* ---------- responsive ---------- */

@media (min-width: 640px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-index-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .page-about .about-index-col:first-child {
    grid-column: 1 / -1;
  }
}

@media (min-width: 820px) {
  .page-about .about-crumb {
    padding-top: calc(var(--header-h) + 26px);
  }

  .page-about .about-hero {
    padding: 76px 0 88px;
  }

  .page-about .about-section {
    padding: 84px 0;
  }

  .page-about .about-head {
    margin-bottom: 56px;
  }

  .page-about .about-rail-item {
    padding-left: 44px;
    padding-bottom: 46px;
  }

  .page-about .about-rail-node {
    top: 12px;
  }

  .page-about .about-rail-card {
    padding: 26px 28px 28px;
  }

  .page-about .about-rail-card h3 {
    font-size: 21px;
  }

  .page-about .about-team-grid {
    grid-template-columns: 1.1fr 0.92fr 1fr;
  }

  .page-about .about-team-col {
    padding: 34px 26px 34px;
  }

  .page-about .about-flow-step summary {
    padding: 20px 24px;
  }

  .page-about .about-flow-body {
    padding: 0 24px 22px 63px;
  }

  .page-about .about-index-col {
    padding: 28px 26px 30px;
  }

  .page-about .about-ops-item {
    flex-direction: row;
    align-items: baseline;
    gap: 20px;
  }

  .page-about .about-ops-label {
    flex: 0 0 120px;
  }
}

@media (min-width: 960px) {
  .page-about .about-flow-layout {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-flow-figure {
    position: sticky;
    top: calc(var(--header-h) + 72px);
  }

  .page-about .about-index-grid {
    grid-template-columns: 1.15fr 0.95fr 1fr;
  }

  .page-about .about-index-col:first-child {
    grid-column: auto;
  }

  .page-about .about-ops-layout {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc-list a,
  .page-about .about-flow-step,
  .page-about .about-flow-step summary::after,
  .page-about .about-rail-card,
  .page-about .breadcrumb-item a {
    transition: none !important;
  }
}
</main>