.page-about {
  --about-pad: clamp(44px, 7vw, 76px);
  --about-text: 68ch;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
}

/* ---------- 封面首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
  padding: clamp(18px, 3.5vw, 30px) 0 clamp(36px, 6vw, 72px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -10% -5%;
  background-image: repeating-linear-gradient(115deg, rgba(242, 107, 29, .16) 0 2px, transparent 2px 28px);
  opacity: .55;
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -18%;
  top: -32%;
  width: 62vw;
  height: 62vw;
  max-width: 620px;
  max-height: 620px;
  background: radial-gradient(circle, rgba(0, 229, 195, .16), transparent 66%);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-crumb ul {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0 0 clamp(22px, 4vw, 40px);
  padding: 0;
  list-style: none;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(250, 247, 242, .55);
}

.page-about .about-crumb li {
  display: flex;
  align-items: center;
  gap: 6px;
}

.page-about .about-crumb li + li::before {
  content: "／";
  opacity: .5;
}

.page-about .about-crumb a {
  color: rgba(250, 247, 242, .72);
  text-decoration: none;
}

.page-about .about-crumb a:hover {
  color: var(--cyan);
}

.page-about .about-crumb [aria-current="page"] {
  color: var(--orange-100);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 5vw, 48px);
  align-items: start;
}

.page-about .about-hero .lh-eyebrow {
  color: var(--orange-100);
  letter-spacing: .14em;
}

.page-about .about-hero__title {
  margin: 14px 0 18px;
  font-size: clamp(2rem, 7vw, 4.1rem);
  line-height: 1.06;
  font-weight: 900;
  letter-spacing: -.02em;
  max-width: 18ch;
}

.page-about .about-hero__title span {
  color: var(--orange);
}

.page-about .about-hero__lede {
  max-width: 46ch;
  color: rgba(250, 247, 242, .78);
  font-size: clamp(.95rem, 2.4vw, 1.05rem);
  line-height: 1.8;
  margin: 0 0 26px;
}

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

.page-about .about-hero__actions .lh-btn--ghost {
  color: var(--paper);
  border-color: rgba(250, 247, 242, .34);
  background: transparent;
}

.page-about .about-hero__actions .lh-btn--ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .about-hero__index {
  border: 1px solid rgba(250, 247, 242, .16);
  border-radius: var(--radius);
  background: rgba(250, 247, 242, .04);
  padding: 18px 18px 10px;
}

.page-about .about-hero__index-title {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: rgba(250, 247, 242, .5);
}

.page-about .about-hero__index-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.page-about .about-hero__index-list li + li {
  border-top: 1px solid rgba(250, 247, 242, .1);
}

.page-about .about-hero__index-list a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0;
  color: rgba(250, 247, 242, .86);
  text-decoration: none;
  font-size: 14px;
  transition: color .18s var(--ease), transform .18s var(--ease);
}

.page-about .about-hero__index-list a:hover {
  color: var(--cyan);
  transform: translateX(3px);
}

.page-about .about-hero__n {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--orange);
  letter-spacing: .04em;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 0;
  background: rgba(250, 247, 242, .16);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .about-facts > div {
  background: var(--ink-800);
  padding: 16px 14px;
}

.page-about .about-facts dt {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: rgba(250, 247, 242, .55);
}

.page-about .about-facts dd {
  margin: 8px 0 0;
  font-size: clamp(1.15rem, 3.4vw, 1.55rem);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
}

/* ---------- 正文骨架 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding-top: clamp(32px, 6vw, 64px);
  padding-bottom: clamp(48px, 7vw, 88px);
}

.page-about .about-toc {
  margin: 0 0 8px;
}

.page-about .about-toc__title {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-toc__link {
  display: block;
  white-space: nowrap;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--ink);
  font-size: 13px;
  text-decoration: none;
  transition: border-color .18s var(--ease), color .18s var(--ease), background .18s var(--ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link.is-active {
  border-color: var(--orange);
  background: var(--orange-100);
  color: var(--ink);
}

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

.page-about .about-sec {
  padding: var(--about-pad) 0;
  min-width: 0;
}

.page-about .about-sec + .about-sec {
  border-top: 1px solid var(--line);
}

.page-about .about-sec--narrow .about-sec__text,
.page-about .about-sec__text {
  max-width: var(--about-text);
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.78;
  color: #2a2a2a;
}

.page-about .about-sec__text--muted {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.7;
}

.page-about .about-sec__num {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--orange-700);
}

.page-about .about-sec__num::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

.page-about .about-sec__title {
  margin: 12px 0 18px;
  font-size: clamp(1.5rem, 4.4vw, 2.35rem);
  line-height: 1.18;
  font-weight: 900;
  letter-spacing: -.018em;
  max-width: 22ch;
}

.page-about .about-note {
  margin: 24px 0;
  padding: 16px 18px;
  border-left: 3px solid var(--orange);
  background: var(--orange-100);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.page-about .about-note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

/* ---------- 图例式原则卡 ---------- */
.page-about .about-legend {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-legend__card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .about-legend__card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.page-about .about-legend__symbol {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .04em;
}

.page-about .about-legend__symbol--orange {
  background: var(--orange);
  color: var(--ink);
}

.page-about .about-legend__symbol--ink {
  background: var(--ink);
  color: var(--cyan);
}

.page-about .about-legend__symbol--cyan {
  background: var(--cyan);
  color: var(--ink);
}

.page-about .about-legend__name {
  margin: 4px 0 0;
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: -.01em;
  line-height: 1.4;
}

.page-about .about-legend__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-legend__link {
  margin-top: auto;
  align-self: flex-start;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .05em;
  color: var(--cyan-700);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}

.page-about .about-legend__link::after {
  content: " →";
}

.page-about .about-legend__link:hover {
  border-bottom-color: var(--cyan-700);
  color: var(--orange-700);
}

/* ---------- 流程条 ---------- */
.page-about .about-flowline {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 26px 0;
  padding: 0;
  list-style: none;
  max-width: 100%;
}

.page-about .about-flowline__step {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 12px 10px;
  border-top: 2px solid var(--orange);
  background: var(--paper-2);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  font-size: 14px;
  font-weight: 700;
}

.page-about .about-flowline__n {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--orange-700);
  font-weight: 500;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 28px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--paper-2);
  box-shadow: var(--shadow-sm);
}

.page-about .about-figure--tight {
  margin-top: 22px;
}

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

.page-about .about-figure__cap {
  padding: 12px 16px;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.65;
  letter-spacing: .02em;
  color: var(--muted);
  border-top: 1px solid var(--line);
  background: #fff;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 30px 0 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 12px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--orange), var(--cyan));
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 28px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 4px;
  width: 14px;
  height: 14px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--paper);
  border: 3px solid var(--orange);
}

.page-about .about-timeline__item:nth-child(2)::before {
  border-color: var(--orange-700);
}

.page-about .about-timeline__item:nth-child(3)::before {
  border-color: var(--cyan-700);
}

.page-about .about-timeline__item:nth-child(4)::before {
  border-color: var(--cyan);
}

.page-about .about-timeline__ver {
  margin: 0 0 6px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--orange-700);
}

.page-about .about-timeline__name {
  margin: 0 0 8px;
  font-size: 1.08rem;
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.78;
  color: #3a3a3a;
}

/* ---------- 团队折叠 ---------- */
.page-about .about-roles {
  margin: 24px 0 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-roles__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 2px;
  cursor: pointer;
  list-style: none;
  font-size: 1rem;
  font-weight: 700;
}

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

.page-about .about-roles__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--mono);
  font-size: 1.15rem;
  color: var(--orange);
  line-height: 1;
}

.page-about .about-roles__item[open] .about-roles__summary::after {
  content: "−";
  color: var(--cyan-700);
}

.page-about .about-roles__dot {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  flex: none;
}

.page-about .about-roles__dot--orange {
  background: var(--orange);
}

.page-about .about-roles__dot--ink {
  background: var(--ink);
}

.page-about .about-roles__dot--cyan {
  background: var(--cyan);
}

.page-about .about-roles__body {
  padding: 0 2px 18px 22px;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 联系与收束 ---------- */
.page-about .about-sec--contact {
  background: linear-gradient(180deg, transparent, rgba(255, 228, 212, .5));
  border-radius: var(--radius);
}

.page-about .about-contact {
  display: grid;
  gap: 0;
  margin: 22px 0 18px;
  max-width: 62ch;
}

.page-about .about-contact__row {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-contact__row .lh-contact__key {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-about .about-contact__row .lh-contact__val {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.page-about .about-contact__value {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  overflow-wrap: anywhere;
}

.page-about .about-copy {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--muted);
  cursor: pointer;
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

.page-about .about-copy:hover {
  border-color: var(--cyan-700);
  color: var(--cyan-700);
}

.page-about .about-copy.is-copied {
  border-color: var(--cyan-700);
  background: var(--cyan);
  color: var(--ink);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 22px 0 0;
}

.page-about .about-topwrap {
  margin: 34px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.page-about .about-top {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .08em;
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  cursor: pointer;
}

.page-about .about-top:hover {
  border-color: var(--orange);
  color: var(--orange-700);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-contact__row {
    grid-template-columns: 100px minmax(0, 1fr);
  }
}

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, .85fr);
    gap: clamp(32px, 5vw, 64px);
  }

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

  .page-about .about-flowline {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-shell {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(28px, 4.5vw, 64px);
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
    margin-bottom: 0;
    padding-right: 8px;
  }

  .page-about .about-toc__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-toc__list li + li {
    margin-top: 2px;
  }

  .page-about .about-toc__link {
    border: none;
    border-left: 2px solid var(--line);
    border-radius: 0;
    background: transparent;
    padding: 8px 10px;
    font-size: 13.5px;
    color: var(--muted);
  }

  .page-about .about-toc__link:hover,
  .page-about .about-toc__link.is-active {
    border-left-color: var(--orange);
    background: transparent;
    color: var(--ink);
    font-weight: 700;
  }

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

@media (min-width: 1120px) {
  .page-about .about-shell {
    grid-template-columns: 220px minmax(0, 1fr);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-legend__card,
  .page-about .about-hero__index-list a,
  .page-about .about-toc__link {
    transition: none;
  }

  .page-about .about-legend__card:hover,
  .page-about .about-hero__index-list a:hover {
    transform: none;
  }
}
<<<END>>>