.page-about {
  --about-rail: 72px;
  --about-ink-2: #33415C;
  background: var(--paper);
  color: var(--ink);
}

/* ---------- Hero ---------- */
.page-about .hero {
  padding: 24px 0 40px;
  border-bottom: 1px solid var(--line);
}

.page-about .hero .wrap {
  display: grid;
  gap: 32px;
}

.page-about .hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 6.2vw, 50px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  margin: 12px 0 0;
  color: var(--ink);
}

.page-about .eyebrow {
  margin: 16px 0 0;
  color: var(--copper);
}

.page-about .hero-lede {
  margin: 18px 0 0;
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--about-ink-2);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .hero-visual {
  position: relative;
  overflow: hidden;
  padding: 26px 22px 22px;
  border: 1px solid var(--indigo-deep);
  border-radius: 2px;
  background: linear-gradient(155deg, var(--indigo-soft) 0%, var(--indigo) 46%, var(--indigo-deep) 100%);
  color: var(--on-dark);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 240px;
}

.page-about .hero-visual::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--copper) 0%, var(--copper-soft) 58%, rgba(228, 183, 127, 0) 100%);
}

.page-about .hero-visual::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 18px;
  height: 100%;
  background-image: repeating-linear-gradient(to bottom, rgba(233, 238, 246, .38) 0 1px, transparent 1px 12px);
  opacity: .55;
  pointer-events: none;
}

.page-about .hv-label {
  margin: 0;
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--on-dark-dim);
}

.page-about .hv-year {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(52px, 10vw, 86px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .hv-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid rgba(233, 238, 246, .2);
}

.page-about .hv-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .hv-num {
  font-size: 22px;
  font-weight: 700;
  color: var(--copper-soft);
}

.page-about .hv-cap {
  font-size: 12px;
  line-height: 1.5;
  color: var(--on-dark-dim);
}

/* ---------- Section shell ---------- */
.page-about .section {
  padding: 44px 0;
  border-top: 1px solid var(--line);
}

.page-about .section--dark,
.page-about .section--teal,
.page-about .section--deep {
  border-top-color: transparent;
}

.page-about .sec-head {
  display: grid;
  gap: 10px;
  max-width: 70ch;
}

.page-about .sec-no {
  display: block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--copper);
}

.page-about .sec-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 4.4vw, 34px);
  line-height: 1.22;
  margin: 0;
  color: var(--ink);
}

.page-about .sec-lede {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-ink-2);
}

.page-about .section--dark .sec-title,
.page-about .section--teal .sec-title,
.page-about .section--deep .sec-title {
  color: var(--white);
}

.page-about .section--dark .sec-lede,
.page-about .section--teal .sec-lede,
.page-about .section--deep .sec-lede {
  color: var(--on-dark);
}

.page-about .section--dark .sec-no,
.page-about .section--teal .sec-no,
.page-about .section--deep .sec-no {
  color: var(--copper-soft);
}

/* ---------- Figures ---------- */
.page-about .fig {
  margin: 28px 0 0;
}

.page-about .fig img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--white);
  object-fit: cover;
}

.page-about .fig-caption {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- Timeline ---------- */
.page-about .tl {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  gap: 16px;
  padding: 15px 0;
  border-top: 1px solid var(--line);
  transition: background-color 160ms var(--ease), box-shadow 160ms var(--ease);
}

.page-about .tl-item::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc(var(--about-rail) - 1px);
  width: 1px;
  background: var(--line);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: calc(var(--about-rail) - 5px);
  top: 22px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--copper);
  z-index: 1;
  transition: background-color 160ms var(--ease), transform 160ms var(--ease);
}

.page-about .tl-item:hover {
  background: var(--white);
  box-shadow: inset 3px 0 0 var(--copper);
}

.page-about .tl-item:hover::before {
  background: var(--copper);
  transform: scale(1.15);
}

.page-about .tl-year {
  position: relative;
  z-index: 2;
  align-self: start;
  padding: 3px 8px 3px 0;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--copper);
  background: transparent;
  white-space: nowrap;
}

.page-about .tl-body {
  min-width: 0;
}

.page-about .tl-stage {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .tl-note {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-ink-2);
}

.page-about .tl-link {
  margin-left: 6px;
  color: var(--teal);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 500;
  white-space: nowrap;
}

.page-about .tl-link:hover {
  color: var(--copper);
}

/* ---------- Two lines ---------- */
.page-about .section--dark {
  background: var(--indigo);
}

.page-about .two-lines {
  display: grid;
  gap: 1px;
  margin-top: 30px;
  background: rgba(233, 238, 246, .18);
  border: 1px solid rgba(233, 238, 246, .18);
  border-radius: 2px;
  overflow: hidden;
}

.page-about .tl-card {
  background: var(--indigo);
  padding: 26px 22px;
}

.page-about .tl-card-tag {
  margin: 0;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--copper-soft);
}

.page-about .tl-card h3 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 20px;
  line-height: 1.35;
  color: var(--white);
}

.page-about .tl-card p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--on-dark);
}

.page-about .inline-link {
  color: var(--copper-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .inline-link:hover {
  color: var(--white);
}

/* ---------- Network tabs ---------- */
.page-about .net-tabs {
  margin-top: 28px;
}

.page-about .segmented {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 0;
}

.page-about .seg-btn {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.4;
  padding: 11px 18px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--white);
  color: var(--indigo);
  cursor: pointer;
  transition: background-color 160ms var(--ease), color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .seg-btn:hover {
  border-color: var(--copper-soft);
  background: var(--paper);
}

.page-about .seg-btn[aria-selected="true"] {
  background: var(--indigo);
  border-color: var(--indigo);
  color: var(--white);
}

.page-about .seg-btn:focus-visible {
  outline: 2px solid var(--copper);
  outline-offset: 2px;
}

.page-about .seg-btn .mono {
  color: var(--copper);
}

.page-about .seg-btn[aria-selected="true"] .mono {
  color: var(--copper-soft);
}

.page-about .tabpanel {
  margin-top: 24px;
}

.page-about .net-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .net-list li {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 16px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .net-key {
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
  padding-top: 3px;
}

.page-about .net-val {
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink);
}

.page-about .fig--half img {
  max-height: 380px;
}

.page-about .net-note {
  margin: 24px 0 0;
  padding: 18px 20px;
  border-left: 3px solid var(--teal);
  background: var(--white);
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-ink-2);
}

/* ---------- Mission ---------- */
.page-about .section--teal {
  background: var(--teal);
}

.page-about .promise-grid {
  margin-top: 30px;
}

.page-about .promise {
  display: flex;
  flex-direction: column;
  padding: 24px 22px;
}

.page-about .promise-no {
  margin: 0;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--copper);
}

.page-about .promise h3 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  line-height: 1.38;
  color: var(--ink);
}

.page-about .promise p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--about-ink-2);
}

.page-about .promise-data {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--teal);
}

/* ---------- Qingdao ---------- */
.page-about .qingdao {
  display: grid;
  gap: 26px;
  margin-top: 28px;
  padding: 28px 22px;
  border-radius: 2px;
  background: linear-gradient(150deg, var(--indigo-soft) 0%, var(--indigo) 60%, var(--indigo-deep) 100%);
  color: var(--on-dark);
  position: relative;
  overflow: hidden;
}

.page-about .qingdao::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--copper) 0%, rgba(200, 122, 46, 0) 70%);
}

.page-about .q-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 21px;
  line-height: 1.35;
  color: var(--white);
}

.page-about .q-text {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--on-dark);
}

.page-about .q-main .btn {
  margin-top: 20px;
}

.page-about .q-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(233, 238, 246, .22);
}

.page-about .q-list li {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(233, 238, 246, .22);
}

.page-about .q-key {
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--copper-soft);
}

.page-about .q-val {
  font-size: 15px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--white);
  word-break: break-word;
}

.page-about .q-sub {
  font-size: 12px;
  line-height: 1.6;
  color: var(--on-dark-dim);
}

/* ---------- Numbers ---------- */
.page-about .num-grid {
  display: grid;
  gap: 1px;
  margin: 30px 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 2px;
  overflow: hidden;
}

.page-about .num-cell {
  background: var(--white);
  padding: 18px 20px;
}

.page-about .num-cell dt {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .03em;
  color: var(--muted);
}

.page-about .num-cell dd {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 5vw, 32px);
  line-height: 1.05;
  color: var(--indigo);
}

.page-about .num-cell dd small {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  color: var(--indigo-soft);
  margin-left: 3px;
}

.page-about .num-foot {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-ink-2);
}

/* ---------- CTA ---------- */
.page-about .section--deep {
  background: var(--indigo-deep);
}

.page-about .cta {
  max-width: 62ch;
}

.page-about .cta-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 4.2vw, 30px);
  line-height: 1.25;
  color: var(--white);
}

.page-about .cta-text {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--on-dark);
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- Responsive ---------- */
@media (min-width: 620px) {
  .page-about .num-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .qingdao {
    padding: 34px 30px;
  }
}

@media (min-width: 900px) {
  .page-about {
    --about-rail: 96px;
  }

  .page-about .hero {
    padding: 56px 0 64px;
  }

  .page-about .hero .wrap {
    grid-template-columns: 5fr 7fr;
    gap: 56px;
    align-items: start;
  }

  .page-about .section {
    padding: 64px 0;
  }

  .page-about .qingdao {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    gap: 40px;
    padding: 40px 38px;
  }

  .page-about .num-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .fig--half img {
    max-height: none;
  }
}

@media (min-width: 1100px) {
  .page-about .tl-item {
    padding: 18px 12px 18px 0;
  }

  .page-about .tl-stage {
    font-size: 17px;
  }
}

@media (max-width: 559px) {
  .page-about .net-list li {
    grid-template-columns: minmax(0, 1fr);
    gap: 5px;
  }

  .page-about .net-key {
    padding-top: 0;
  }

  .page-about .hv-stats {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

  .page-about .hv-stat {
    flex-direction: row;
    align-items: baseline;
    gap: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-item,
  .page-about .tl-item::before,
  .page-about .seg-btn {
    transition: none;
  }

  .page-about .tl-item:hover::before {
    transform: none;
  }
}