.page-about {
  --about-line: rgba(36, 48, 74, 0.85);
  --about-line-soft: rgba(36, 48, 74, 0.5);
  background: var(--deep);
  color: var(--mist);
  font-family: var(--font-display);
  overflow-x: hidden;
}

.page-about .container {
  max-width: var(--content-max);
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* ---------- Hero ---------- */
.page-about .mission-hero {
  position: relative;
  isolation: isolate;
  padding: 20px 0 52px;
  border-bottom: 1px solid var(--about-line);
  background:
    radial-gradient(780px 400px at 84% 4%, rgba(26, 92, 255, 0.28), transparent 68%),
    radial-gradient(620px 360px at 2% 92%, rgba(0, 229, 195, 0.13), transparent 72%),
    linear-gradient(180deg, var(--deep) 0%, var(--abyss) 100%);
}

.page-about .mission-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(90deg, rgba(36, 48, 74, 0.55) 1px, transparent 1px),
    linear-gradient(0deg, rgba(36, 48, 74, 0.4) 1px, transparent 1px);
  background-size: 92px 92px, 92px 92px;
  -webkit-mask-image: radial-gradient(130% 92% at 50% 0%, #000 18%, transparent 78%);
  mask-image: radial-gradient(130% 92% at 50% 0%, #000 18%, transparent 78%);
  opacity: 0.34;
}

.page-about .breadcrumb {
  margin-bottom: 26px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--star);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .breadcrumb li:not(:last-child)::after {
  content: "/";
  margin-left: 8px;
  color: var(--orbit);
}

.page-about .breadcrumb a {
  color: var(--star);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .breadcrumb a:hover {
  color: var(--cyan);
  border-bottom-color: rgba(0, 229, 195, 0.5);
}

.page-about .mission-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  align-items: center;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0;
}

.page-about .mission-hero__title {
  margin: 14px 0 0;
  font-size: clamp(40px, 8.4vw, 86px);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--mist);
}

.page-about .mission-hero__title em {
  display: inline-block;
  font-style: normal;
  background: linear-gradient(96deg, var(--cyan) 10%, var(--blue) 92%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .mission-hero__lede {
  max-width: 40em;
  margin: 20px 0 0;
  font-size: clamp(15px, 1.7vw, 17.5px);
  line-height: 1.82;
  color: var(--star);
}

.page-about .mission-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 30px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: 14px;
  overflow: hidden;
}

.page-about .mission-stats__item {
  padding: 15px 16px;
  background: rgba(21, 28, 46, 0.82);
}

.page-about .mission-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 27px);
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .mission-stats__label {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--star);
}

.page-about .mission-hero__visual {
  position: relative;
  margin: 0;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--orbit);
  box-shadow: 0 24px 60px -30px rgba(26, 92, 255, 0.6);
}

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

.page-about .mission-hero__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(155deg, rgba(26, 92, 255, 0.22), rgba(0, 229, 195, 0.1) 55%, transparent 85%);
  pointer-events: none;
}

/* ---------- Body grid + TOC ---------- */
.page-about .mission-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
  padding-top: 44px;
  padding-bottom: 68px;
}

.page-about .mission-toc {
  min-width: 0;
}

.page-about .mission-toc__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--star);
}

.page-about .mission-toc__list {
  display: flex;
  gap: 6px;
  margin: 10px 0 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .mission-toc__list a {
  display: flex;
  align-items: center;
  padding: 9px 12px;
  border-radius: 9px;
  border-left: 2px solid transparent;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--star);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .mission-toc__list a:hover {
  color: var(--mist);
  background: rgba(26, 92, 255, 0.12);
}

.page-about .mission-toc__list a.is-active {
  color: var(--mist);
  background: rgba(26, 92, 255, 0.18);
  border-left-color: var(--cyan);
}

/* ---------- Flow rail ---------- */
.page-about .mission-flow {
  position: relative;
  display: grid;
  gap: 48px;
  min-width: 0;
}

.page-about .mission-flow::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 90px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, rgba(0, 229, 195, 0.9), rgba(26, 92, 255, 0.6) 40%, rgba(26, 92, 255, 0.05) 100%);
}

.page-about .flow-section {
  position: relative;
  padding-left: 26px;
  scroll-margin-top: calc(var(--masthead-h) + 24px);
}

.page-about .flow-section::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--deep);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(0, 229, 195, 0.1);
}

.page-about .flow-section__head {
  margin-bottom: 18px;
}

.page-about .flow-section__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .flow-section h2 {
  margin: 8px 0 0;
  font-size: clamp(23px, 3.6vw, 38px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .flow-section__lede {
  max-width: 40em;
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--star);
}

.page-about .mission-copy {
  max-width: 42em;
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--star);
}

.page-about .mission-copy strong {
  color: var(--mist);
  font-weight: 700;
}

/* ---------- Audience cards ---------- */
.page-about .who-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 20px;
}

.page-about .who-card {
  position: relative;
  padding: 20px 18px 22px;
  border: 1px solid var(--orbit);
  border-radius: 14px;
  background: linear-gradient(165deg, rgba(21, 28, 46, 0.96), rgba(11, 15, 26, 0.9));
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
  transition: transform 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .who-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 229, 195, 0.6);
}

.page-about .who-card__label {
  display: inline-block;
  margin-bottom: 12px;
  padding: 5px 10px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--deep);
  background: linear-gradient(92deg, var(--cyan), #4de2a8);
}

.page-about .who-card__scene {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--star);
}

.page-about .who-card__gain {
  margin: 0;
  padding-top: 10px;
  border-top: 1px dashed var(--about-line-soft);
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- Accordion ---------- */
.page-about .svc-list {
  margin-top: 20px;
  border-top: 1px solid var(--about-line);
}

.page-about .svc {
  border-bottom: 1px solid var(--about-line);
}

.page-about .svc__sum {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) 26px;
  gap: 10px;
  align-items: center;
  padding: 15px 6px 15px 12px;
  cursor: pointer;
  list-style: none;
  border-left: 2px solid transparent;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

.page-about .svc__sum:hover {
  background: rgba(26, 92, 255, 0.09);
  border-left-color: var(--cyan);
}

.page-about .svc[open] > .svc__sum {
  background: rgba(26, 92, 255, 0.1);
  border-left-color: var(--cyan);
}

.page-about .svc__no {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 0.04em;
}

.page-about .svc__main {
  display: block;
  min-width: 0;
}

.page-about .svc__name {
  display: block;
  font-size: 16px;
  font-weight: 700;
  color: var(--mist);
}

.page-about .svc__hint {
  display: block;
  margin-top: 3px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--star);
}

.page-about .svc__marker {
  position: relative;
  width: 14px;
  height: 14px;
  justify-self: end;
}

.page-about .svc__marker::before,
.page-about .svc__marker::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--star);
  transform: translate(-50%, -50%);
  transition: transform 0.24s var(--ease), background 0.24s var(--ease);
}

.page-about .svc__marker::before {
  width: 14px;
  height: 2px;
}

.page-about .svc__marker::after {
  width: 2px;
  height: 14px;
}

.page-about .svc[open] .svc__marker::after {
  transform: translate(-50%, -50%) scaleY(0);
}

.page-about .svc[open] .svc__marker::before {
  background: var(--cyan);
}

.page-about .svc__body {
  padding: 0 6px 16px 54px;
}

.page-about .svc__body .mission-copy {
  margin-bottom: 0;
  font-size: 14.5px;
}

/* ---------- Timeline ---------- */
.page-about .track-figure {
  margin: 20px 0 22px;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--orbit);
}

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

.page-about .track {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .track__item {
  position: relative;
  display: grid;
  gap: 8px;
}

.page-about .track__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 21px;
  letter-spacing: 0.03em;
  color: var(--cyan);
}

.page-about .track__panel {
  position: relative;
  padding: 15px 17px;
  border: 1px solid var(--orbit);
  border-left: 2px solid rgba(0, 229, 195, 0.55);
  border-radius: 4px;
  background: rgba(21, 28, 46, 0.92);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  transition: transform 0.22s var(--ease), border-color 0.22s var(--ease), background 0.22s var(--ease);
}

.page-about .track__panel:hover {
  transform: translateY(-3px);
  border-color: rgba(0, 229, 195, 0.62);
  background: rgba(24, 32, 54, 0.98);
}

.page-about .track__panel h3 {
  margin: 0 0 6px;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--mist);
}

.page-about .track__panel p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--star);
}

/* ---------- Team ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 20px;
}

.page-about .team-card {
  padding: 18px;
  border: 1px solid var(--orbit);
  border-radius: 12px;
  background: linear-gradient(180deg, rgba(21, 28, 46, 0.96), rgba(11, 15, 26, 0.86));
}

.page-about .team-card__role {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .team-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--star);
}

.page-about .process-note {
  margin-top: 16px;
  padding: 16px 18px;
  border: 1px solid rgba(255, 181, 71, 0.36);
  border-left: 3px solid var(--amber);
  border-radius: 10px;
  background: rgba(255, 181, 71, 0.06);
}

.page-about .process-note p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--star);
}

/* ---------- Yunnan / contact ---------- */
.page-about .yunnan-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 20px;
}

.page-about .yunnan-figure {
  position: relative;
  margin: 0;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--orbit);
}

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

.page-about .yunnan-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(26, 92, 255, 0.24), rgba(0, 229, 195, 0.12) 58%, rgba(7, 10, 18, 0.42) 100%);
  pointer-events: none;
}

.page-about .reach {
  display: grid;
  gap: 1px;
  margin-top: 18px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: 12px;
  overflow: hidden;
}

.page-about .reach__row {
  display: grid;
  gap: 3px;
  padding: 13px 15px;
  background: rgba(21, 28, 46, 0.92);
}

.page-about .reach__k {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--star);
}

.page-about .reach__v {
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
  word-break: break-word;
}

.page-about .reach__v a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 195, 0.4);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .reach__v a:hover {
  color: var(--mist);
  border-bottom-color: var(--mist);
}

/* ---------- CTA ---------- */
.page-about .about-cta {
  position: relative;
  margin-top: 8px;
  padding: 28px 20px;
  border: 1px solid var(--orbit);
  border-radius: 16px;
  background:
    radial-gradient(560px 240px at 92% 8%, rgba(26, 92, 255, 0.34), transparent 70%),
    radial-gradient(420px 200px at 4% 96%, rgba(0, 229, 195, 0.14), transparent 72%),
    linear-gradient(140deg, #131a2c, #0a0e18);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.page-about .about-cta h2 {
  margin: 0;
  font-size: clamp(22px, 3.2vw, 32px);
  font-weight: 800;
  line-height: 1.2;
  color: var(--mist);
}

.page-about .about-cta p {
  max-width: 38em;
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--star);
}

.page-about .cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

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

/* ---------- Media queries ---------- */
@media (min-width: 560px) {
  .page-about .reach__row {
    grid-template-columns: 86px minmax(0, 1fr);
    gap: 12px;
    align-items: baseline;
  }
}

@media (min-width: 720px) {
  .page-about .who-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .svc__body {
    padding-left: 60px;
  }
}

@media (min-width: 900px) {
  .page-about .mission-hero {
    padding: 28px 0 64px;
  }

  .page-about .mission-hero__grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 46px;
  }

  .page-about .yunnan-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 28px;
    align-items: center;
  }
}

@media (min-width: 1000px) {
  .page-about .container {
    padding-left: 24px;
    padding-right: 24px;
  }

  .page-about .mission-body {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 54px;
    padding-top: 60px;
    padding-bottom: 92px;
  }

  .page-about .mission-toc {
    position: sticky;
    top: calc(var(--masthead-h) + 24px);
    align-self: start;
  }

  .page-about .mission-toc__list {
    display: grid;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .mission-flow {
    gap: 66px;
  }

  .page-about .mission-flow::before {
    left: 7px;
  }

  .page-about .flow-section {
    padding-left: 40px;
  }

  .page-about .flow-section::before {
    left: 2px;
  }

  .page-about .about-cta {
    padding: 34px 32px;
  }
}

@media (min-width: 1080px) {
  .page-about .track__item {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 22px;
    align-items: start;
  }

  .page-about .track__year {
    padding-top: 12px;
    font-size: 23px;
    text-align: right;
  }

  .page-about .track__item::before {
    content: "";
    position: absolute;
    left: 88px;
    top: 24px;
    width: 22px;
    height: 2px;
    background: linear-gradient(90deg, rgba(0, 229, 195, 0.75), rgba(26, 92, 255, 0.3));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .who-card,
  .page-about .track__panel,
  .page-about .svc__sum,
  .page-about .mission-toc__list a {
    transition: none;
  }
}