.page-about {
  --about-line: rgba(124, 136, 148, 0.2);
  --about-line-soft: rgba(124, 136, 148, 0.12);
  --about-card: var(--ink-deep);
  background: var(--ink-abyss);
  color: var(--paper);
  overflow-x: clip;
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 5vw, 56px) 0 clamp(32px, 5vw, 60px);
  border-bottom: 1px solid var(--about-line);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(900px 420px at 78% 8%, rgba(43, 227, 200, 0.1), transparent 62%),
    radial-gradient(720px 380px at 8% 98%, rgba(255, 106, 31, 0.08), transparent 66%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  display: block;
}

.page-about .about-hero__crumb {
  margin-bottom: clamp(20px, 4vw, 34px);
  font-size: 13px;
  color: var(--stone);
}

.page-about .about-hero__crumb a {
  color: var(--stone);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-hero__crumb a:hover,
.page-about .about-hero__crumb a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--signal);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 5vw, 44px);
}

.page-about .about-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 16px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--neon);
}

.page-about .about-hero__pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 0 5px rgba(43, 227, 200, 0.16);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(16px, 2.4vw, 22px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 6.4vw, 60px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__title-sub {
  display: block;
  margin-top: 0.16em;
  font-size: clamp(24px, 4.4vw, 44px);
  color: var(--neon);
}

.page-about .about-hero__intro {
  max-width: 46ch;
  margin: 0 0 clamp(20px, 3vw, 28px);
  font-size: 16px;
  line-height: 1.78;
  color: var(--paper-light);
}

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

.page-about .about-hero__visual {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 180px;
}

.page-about .about-orbit {
  width: 100%;
  max-width: 520px;
  height: auto;
  display: block;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--about-line);
}

.page-about .about-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--ink-abyss);
}

.page-about .about-hero__fact b {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3.4vw, 34px);
  letter-spacing: 0.02em;
  line-height: 1;
  color: var(--paper);
}

.page-about .about-hero__fact:nth-child(2) b { color: var(--signal); }
.page-about .about-hero__fact:nth-child(3) b { color: var(--neon); }
.page-about .about-hero__fact:nth-child(4) b { color: var(--sand); }

.page-about .about-hero__fact span {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--stone);
}

/* ---------- Body grid ---------- */
.page-about .about-body {
  padding: clamp(34px, 6vw, 74px) 0 clamp(48px, 7vw, 96px);
}

.page-about .about-body__inner {
  display: grid;
  gap: clamp(26px, 4vw, 40px);
}

/* ---------- Rail ---------- */
.page-about .about-rail__label {
  margin: 0 0 12px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--stone);
}

.page-about .about-rail__list {
  position: relative;
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__item {
  flex: none;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-pill);
  font-size: 13px;
  color: var(--stone);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease), background 0.22s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--paper);
  border-color: var(--neon);
  background: rgba(43, 227, 200, 0.08);
}

/* ---------- Sections ---------- */
.page-about .about-sec {
  padding: clamp(28px, 4vw, 46px) 0;
  border-top: 1px solid var(--about-line);
  scroll-margin-top: calc(var(--bar-h-compact) + 20px);
}

.page-about .about-flow > .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-sec__tag {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 14px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--neon);
}

.page-about .about-sec__tag::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 0 4px rgba(43, 227, 200, 0.16);
}

.page-about .about-sec__tag--sand {
  color: var(--sand);
}

.page-about .about-sec__tag--sand::before {
  box-shadow: 0 0 0 4px rgba(201, 168, 130, 0.16);
}

.page-about .about-sec__title {
  margin: 0 0 clamp(14px, 2vw, 20px);
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4.2vw, 42px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-sec__lead {
  max-width: 62ch;
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  font-size: 16px;
  line-height: 1.78;
  color: var(--paper-light);
}

.page-about .about-sec__note,
.page-about .about-sec__foot {
  max-width: 62ch;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--paper-light);
}

.page-about .about-sec__note {
  padding-left: 16px;
  border-left: 3px solid var(--signal);
  font-style: italic;
  color: var(--stone);
}

.page-about .about-sec__foot a,
.page-about .about-credential__foot a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 227, 200, 0.4);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-sec__foot a:hover,
.page-about .about-sec__foot a:focus-visible,
.page-about .about-credential__foot a:hover,
.page-about .about-credential__foot a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--signal);
}

/* ---------- Business lines ---------- */
.page-about .about-lines {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.page-about .about-line {
  --accent: var(--signal);
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  padding: 18px 20px;
  background: var(--about-card);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-md);
  transition: transform 0.28s var(--ease), background 0.28s var(--ease);
}

.page-about .about-line:hover {
  transform: translateX(4px);
  background: #16324c;
}

.page-about .about-line:nth-child(2) { --accent: var(--neon); }
.page-about .about-line:nth-child(3) { --accent: var(--sand); }
.page-about .about-line:nth-child(4) { --accent: var(--moss); }

.page-about .about-line__idx {
  padding-top: 3px;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--accent);
}

.page-about .about-line__body h3 {
  margin: 0 0 7px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-line__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--paper-light);
}

.page-about .about-line__body .about-line__who {
  margin: 10px 0 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--stone);
}

/* ---------- Team ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

.page-about .about-ring {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-lg);
  background: linear-gradient(155deg, rgba(18, 41, 63, 0.9), rgba(10, 27, 46, 0.6));
}

.page-about .about-ring__chart {
  position: relative;
  flex: none;
  width: clamp(150px, 42vw, 190px);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: conic-gradient(
    var(--signal) 0turn 0.553turn,
    var(--neon) 0.553turn 0.789turn,
    var(--moss) 0.789turn 1turn
  );
  box-shadow: 0 0 0 1px rgba(124, 136, 148, 0.2);
}

.page-about .about-ring__hole {
  position: absolute;
  inset: 28%;
  display: grid;
  place-content: center;
  text-align: center;
  border-radius: 50%;
  background: var(--ink-abyss);
}

.page-about .about-ring__hole b {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  line-height: 1;
  color: var(--paper);
}

.page-about .about-ring__hole span {
  display: block;
  margin-top: 4px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--stone);
}

.page-about .about-ring__legend {
  display: grid;
  gap: 11px;
  width: 100%;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-ring__legend li {
  display: grid;
  grid-template-columns: 10px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  font-size: 13.5px;
  color: var(--paper-light);
  transition: color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-ring__legend li:hover {
  color: var(--paper);
  transform: translateX(3px);
}

.page-about .about-ring__legend b {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  color: var(--paper);
}

.page-about .about-ring__swatch {
  width: 10px;
  height: 10px;
  border-radius: 3px;
}

.page-about .about-ring__legend li:nth-child(1) .about-ring__swatch { background: var(--signal); }
.page-about .about-ring__legend li:nth-child(2) .about-ring__swatch { background: var(--neon); }
.page-about .about-ring__legend li:nth-child(3) .about-ring__swatch { background: var(--moss); }

.page-about .about-team__media {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-lg);
  aspect-ratio: 4 / 3;
  background: var(--ink-deep);
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- Wide figure ---------- */
.page-about .about-wide {
  margin: 0 0 clamp(22px, 3vw, 30px);
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-line);
  background: var(--ink-deep);
}

.page-about .about-wide img {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- Field definitions ---------- */
.page-about .about-fields {
  margin: 0 0 clamp(22px, 3vw, 30px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-fields__row {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-fields__row dt {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--neon);
}

.page-about .about-fields__row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--paper-light);
}

/* ---------- Data band ---------- */
.page-about .about-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--about-line);
}

.page-about .about-band__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 20px;
  background: var(--about-card);
}

.page-about .about-band__item b {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(20px, 2.8vw, 28px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--signal);
}

.page-about .about-band__item:nth-child(2) b { color: var(--neon); }
.page-about .about-band__item:nth-child(3) b { color: var(--neon); }
.page-about .about-band__item:nth-child(4) b { color: var(--sand); }

.page-about .about-band__item span {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--stone);
}

/* ---------- Timeline ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 42px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--neon), var(--signal) 58%, var(--sand-deep));
  opacity: 0.34;
}

.page-about .about-node {
  position: relative;
  padding-bottom: 26px;
}

.page-about .about-node:last-child {
  padding-bottom: 0;
}

.page-about .about-node::after {
  content: "";
  position: absolute;
  left: -28px;
  top: 24px;
  width: 22px;
  height: 26px;
  border-left: 2px solid rgba(43, 227, 200, 0.4);
  border-bottom: 2px solid rgba(43, 227, 200, 0.4);
  border-bottom-left-radius: 22px;
  pointer-events: none;
}

.page-about .about-node__marker {
  position: absolute;
  left: -36px;
  top: 12px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink-abyss);
  border: 2px solid var(--neon);
  box-shadow: 0 0 0 4px rgba(43, 227, 200, 0.12);
}

.page-about .about-node__panel {
  padding: 18px 20px;
  background: var(--about-card);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-md);
}

.page-about .about-node__stage {
  margin: 0 0 8px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--sand);
}

.page-about .about-node__panel h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-node__panel > p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--paper-light);
}

.page-about .about-node__more {
  margin-top: 13px;
}

.page-about .about-node__more summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border: 1px solid rgba(43, 227, 200, 0.32);
  border-radius: var(--radius-pill);
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--neon);
  cursor: pointer;
  list-style: none;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

.page-about .about-node__more summary::before {
  content: "＋";
  font-size: 12px;
  line-height: 1;
}

.page-about .about-node__more[open] summary::before {
  content: "－";
}

.page-about .about-node__more summary:hover,
.page-about .about-node__more summary:focus-visible {
  background: rgba(43, 227, 200, 0.1);
  border-color: var(--neon);
}

.page-about .about-node__more p {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--stone);
}

.page-about .about-archive-media {
  margin: clamp(24px, 3.4vw, 34px) 0 0;
  overflow: hidden;
  border: 2px solid var(--sand-deep);
  border-radius: var(--radius-lg);
  background: var(--ink-deep);
  position: relative;
}

.page-about .about-archive-media::after {
  content: "已归档";
  position: absolute;
  top: 14px;
  left: 14px;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: rgba(10, 27, 46, 0.82);
  border: 1px solid var(--sand-deep);
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--sand);
}

.page-about .about-archive-media img {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- Partners ---------- */
.page-about .about-partners {
  display: grid;
  gap: 16px;
}

.page-about .about-partners__block {
  padding: 18px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--about-line);
  background: linear-gradient(150deg, rgba(79, 107, 74, 0.22), rgba(18, 41, 63, 0.5));
}

.page-about .about-partners__block h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-partners__block p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--paper-light);
}

/* ---------- Credential ---------- */
.page-about .about-sec--last {
  padding-bottom: 0;
}

.page-about .about-credential {
  margin-top: 6px;
  padding: clamp(22px, 3.4vw, 38px);
  border: 1px solid var(--sand-deep);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(201, 168, 130, 0.14), rgba(138, 113, 84, 0.07));
}

.page-about .about-credential__lead {
  max-width: 58ch;
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--paper-light);
}

.page-about .about-cred {
  margin: 0;
  border-top: 1px solid rgba(138, 113, 84, 0.42);
}

.page-about .about-cred__row {
  display: grid;
  gap: 4px;
  padding: 13px 0;
  border-bottom: 1px solid rgba(138, 113, 84, 0.42);
}

.page-about .about-cred__row dt {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--sand);
}

.page-about .about-cred__row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--paper);
  word-break: break-word;
}

.page-about .about-credential__foot {
  margin: clamp(18px, 2.6vw, 24px) 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--paper-light);
}

/* ---------- Responsive ---------- */
@media (min-width: 560px) {
  .page-about .about-ring {
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
  }

  .page-about .about-ring__legend {
    width: auto;
    min-width: 150px;
  }
}

@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-fields__row {
    grid-template-columns: 152px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }

  .page-about .about-cred__row {
    grid-template-columns: 168px minmax(0, 1fr);
    align-items: baseline;
  }

  .page-about .about-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: center;
    gap: clamp(32px, 5vw, 60px);
  }

  .page-about .about-hero__lead {
    padding-right: 8px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }

  .page-about .about-ring {
    flex-direction: column;
    align-items: flex-start;
    height: 100%;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body__inner {
    grid-template-columns: 188px minmax(0, 1fr);
    gap: clamp(40px, 6vw, 88px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--bar-h-compact) + 24px);
    align-self: start;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-about .about-rail__list::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 12px;
    bottom: 12px;
    width: 1px;
    background: linear-gradient(180deg, rgba(43, 227, 200, 0.5), rgba(201, 168, 130, 0.4));
    opacity: 0.5;
  }

  .page-about .about-rail__item {
    flex: initial;
  }

  .page-about .about-rail__link {
    display: grid;
    grid-template-columns: 16px minmax(0, 1fr);
    align-items: center;
    gap: 12px;
    padding: 9px 0;
    border: 0;
    border-radius: 0;
    background: none;
    font-size: 13.5px;
  }

  .page-about .about-rail__link::before {
    content: "";
    width: 9px;
    height: 9px;
    border-radius: 50%;
    border: 1px solid currentColor;
    background: var(--ink-abyss);
    transition: background 0.22s var(--ease), border-color 0.22s var(--ease), box-shadow 0.22s var(--ease);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: none;
    border-color: transparent;
    color: var(--neon);
  }

  .page-about .about-rail__link:hover::before,
  .page-about .about-rail__link:focus-visible::before {
    background: var(--neon);
    border-color: var(--neon);
    box-shadow: 0 0 0 4px rgba(43, 227, 200, 0.16);
  }

  .page-about .about-sec__title {
    max-width: 24ch;
  }
}

@media (min-width: 1180px) {
  .page-about .about-flow {
    padding-right: clamp(0px, 2vw, 30px);
  }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-line,
  .page-about .about-ring__legend li,
  .page-about .about-rail__link,
  .page-about .about-node__more summary {
    transition: none !important;
  }

  .page-about .about-line:hover,
  .page-about .about-ring__legend li:hover {
    transform: none;
  }
}