.page-about {
  --about-card-shadow: 3px 3px 0 rgba(255, 106, 43, .38);
  --about-card-shadow-hover: 7px 7px 0 rgba(255, 106, 43, .5);
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding: 20px 0 6px;
  font-size: 13px;
  color: var(--mist);
}

.page-about .breadcrumbs a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* ---------- 通用排版 ---------- */
.page-about h2 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(23px, 4.4vw, 38px);
  line-height: 1.18;
  letter-spacing: -.015em;
  color: var(--paper);
}

.page-about h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.38;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-copy p {
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-copy p + p {
  margin-top: 1em;
}

.page-about .about-sec-head {
  max-width: 620px;
}

.page-about .about-sec-head > p.about-copy {
  margin-top: 14px;
}

.page-about .about-copy a,
.page-about .about-channels a {
  color: var(--celadon);
  text-decoration: none;
  border-bottom: 1px solid rgba(95, 191, 154, .5);
}

.page-about .about-copy a:hover,
.page-about .about-channels a:hover {
  color: var(--yellow);
  border-bottom-color: var(--yellow);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 8px 0 56px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -180px;
  right: -160px;
  width: min(760px, 92vw);
  height: 640px;
  background:
    radial-gradient(closest-side, rgba(255, 106, 43, .3), transparent 72%) 0 0 / 480px 480px no-repeat,
    radial-gradient(closest-side, rgba(62, 111, 209, .42), transparent 72%) 150px 200px / 460px 460px no-repeat;
  filter: blur(4px);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(52%, 620px);
  height: 70%;
  background: linear-gradient(155deg, rgba(255, 106, 43, .2), rgba(62, 111, 209, .04));
  clip-path: polygon(32% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 34px;
}

.page-about .about-hero-main h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 7.2vw, 62px);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--paper);
}

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

.page-about .about-lede {
  margin: 18px 0 0;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-lede + .about-lede {
  margin-top: 12px;
}

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

/* 概览纸卡 */
.page-about .about-facts {
  padding: 22px 20px 18px;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--ink);
  box-shadow: 4px 4px 0 var(--orange);
}

.page-about .about-facts-head {
  margin: 0 0 14px;
  padding-bottom: 10px;
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: rgba(19, 26, 43, .58);
  border-bottom: 1px dashed rgba(19, 26, 43, .3);
}

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

.page-about .about-facts-list li {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
}

.page-about .about-fact-num {
  font-size: 23px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--orange);
}

.page-about .about-fact-label {
  font-size: 13px;
  line-height: 1.62;
  color: rgba(19, 26, 43, .78);
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  padding: 4px 0 56px;
}

.page-about .about-origin-grid {
  display: grid;
  gap: 28px;
}

.page-about .about-origin-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-origin-points li {
  padding: 16px 18px;
  background: rgba(22, 38, 90, .74);
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
}

.page-about .about-origin-points li:nth-child(2) {
  border-left-color: var(--celadon);
}

.page-about .about-origin-points li:nth-child(3) {
  border-left-color: var(--track);
}

.page-about .about-point-key {
  display: block;
  margin-bottom: 8px;
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--mist);
  opacity: .78;
}

.page-about .about-origin-points p {
  margin-top: 7px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  padding: 56px 0;
  border-top: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(35, 56, 127, .46), rgba(11, 23, 51, 0) 78%);
}

.page-about .about-evo-figure {
  margin: 32px 0 0;
}

.page-about .about-evo-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--block);
}

.page-about .about-evo-figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--mist);
  opacity: .82;
}

.page-about .about-tl-wrap {
  margin-top: 38px;
  display: grid;
  gap: 30px;
}

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

.page-about .about-tl-item {
  position: relative;
  padding: 0 0 30px 30px;
  border-left: 1px solid rgba(62, 111, 209, .48);
}

.page-about .about-tl-item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--night);
  border: 2px solid var(--orange);
}

.page-about .about-tl-item:nth-child(2)::before {
  border-color: var(--celadon);
}

.page-about .about-tl-item:nth-child(3)::before {
  border-color: var(--yellow);
}

.page-about .about-tl-item:nth-child(4)::before {
  border-color: var(--track);
}

.page-about .about-tl-year {
  display: block;
  margin-bottom: 10px;
  font-size: clamp(32px, 6.4vw, 46px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: rgba(195, 206, 228, .2);
  -webkit-text-stroke: 1px rgba(195, 206, 228, .62);
}

.page-about .about-tl-card {
  display: block;
  background: var(--block);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--about-card-shadow);
  transition: transform .24s var(--ease), box-shadow .24s var(--ease);
}

.page-about .about-tl-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--about-card-shadow-hover);
}

.page-about .about-tl-card summary {
  position: relative;
  display: block;
  padding: 16px 46px 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-tl-card summary::after {
  content: "+";
  position: absolute;
  top: 15px;
  right: 18px;
  font-family: var(--font-mono);
  font-size: 19px;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-tl-card[open] summary::after {
  content: "\2212";
}

.page-about .about-tl-card summary h3 {
  margin-top: 9px;
}

.page-about .about-tl-card summary:hover h3 {
  color: var(--orange);
}

.page-about .about-tl-detail {
  margin: 0 18px;
  padding: 14px 0 18px;
  border-top: 1px solid var(--line-soft);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-tl-notes {
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-about .about-tl-notes-title {
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mist);
  opacity: .82;
}

.page-about .about-tl-notes ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-tl-notes a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 11px;
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  background: rgba(35, 56, 127, .42);
  border: 1px solid transparent;
  border-left: 2px solid var(--track);
  transition: color .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease);
}

.page-about .about-tl-notes a:hover,
.page-about .about-tl-notes a:focus-visible {
  color: var(--paper);
  background: rgba(35, 56, 127, .78);
  border-color: var(--line);
  border-left-color: var(--orange);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  position: relative;
  padding: 56px 0 60px;
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-team::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg,
    var(--orange) 0 34%,
    var(--yellow) 34% 62%,
    var(--celadon) 62% 100%);
}

.page-about .about-team h2 {
  color: var(--ink);
}

.page-about .about-team .eyebrow {
  color: rgba(19, 26, 43, .6);
}

.page-about .about-team-top {
  display: grid;
  gap: 26px;
}

.page-about .about-team-copy p {
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(19, 26, 43, .78);
}

.page-about .about-team-copy p + p {
  margin-top: 12px;
}

.page-about .about-team-copy h2 {
  margin-bottom: 16px;
}

.page-about .about-team-figure {
  margin: 0;
}

.page-about .about-team-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--ink);
  box-shadow: 5px 5px 0 rgba(19, 26, 43, .16);
}

.page-about .about-roles {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-roles .about-role {
  padding: 18px 16px 16px;
  background: #fff;
  border: 1px solid var(--ink);
  box-shadow: 3px 3px 0 rgba(19, 26, 43, .14);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .about-roles .about-role:hover {
  transform: translateY(-4px);
  box-shadow: 7px 7px 0 rgba(255, 106, 43, .42);
}

.page-about .about-role-idx {
  display: block;
  margin-bottom: 10px;
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--orange);
}

.page-about .about-role h3 {
  color: var(--ink);
  font-size: 16.5px;
}

.page-about .about-role p {
  margin-top: 9px;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(19, 26, 43, .74);
}

/* ---------- 内容来源 ---------- */
.page-about .about-sources {
  padding: 56px 0;
}

.page-about .about-sources-grid {
  display: grid;
  gap: 28px;
}

.page-about .about-sources-figure {
  margin: 0;
}

.page-about .about-sources-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--block);
}

.page-about .about-sources-copy > p.about-copy {
  margin-top: 16px;
}

.page-about .about-channels {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .about-channels li {
  display: grid;
  grid-template-columns: 86px minmax(0, 1fr);
  gap: 14px;
  padding: 14px 0;
  border-top: 1px dashed var(--line);
}

.page-about .about-channels li:last-child {
  border-bottom: 1px dashed var(--line);
}

.page-about .about-ch-key {
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.7;
  letter-spacing: .05em;
  color: var(--celadon);
}

.page-about .about-channels p {
  font-size: 14px;
  line-height: 1.74;
  color: var(--mist);
}

/* ---------- 维护节奏 ---------- */
.page-about .about-upkeep {
  padding: 54px 0 58px;
  background: linear-gradient(165deg, rgba(35, 56, 127, .7), rgba(22, 38, 90, .24));
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-upkeep-grid {
  display: grid;
  gap: 28px;
}

.page-about .about-upkeep-copy h2 {
  margin-bottom: 16px;
}

.page-about .about-upkeep-card {
  padding: 22px 20px;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--ink);
  box-shadow: 6px 6px 0 var(--orange);
}

.page-about .about-upkeep-kicker {
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: rgba(19, 26, 43, .56);
}

.page-about .about-upkeep-date {
  display: block;
  margin: 10px 0 12px;
  font-size: clamp(30px, 8vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--orange);
}

.page-about .about-upkeep-text {
  font-size: 14px;
  line-height: 1.72;
  color: rgba(19, 26, 43, .76);
}

.page-about .about-upkeep-card a {
  display: inline-block;
  margin-top: 16px;
  padding-bottom: 2px;
  font-size: 13px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid var(--orange);
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-upkeep-card a:hover,
.page-about .about-upkeep-card a:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--ink);
}

/* ---------- 三条标准 ---------- */
.page-about .about-principles {
  padding: 56px 0;
}

.page-about .about-principles-list {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-principles-list li {
  padding: 20px 18px;
  background: rgba(22, 38, 90, .62);
  border-top: 3px solid var(--orange);
}

.page-about .about-principles-list li:nth-child(2) {
  border-top-color: var(--yellow);
}

.page-about .about-principles-list li:nth-child(3) {
  border-top-color: var(--celadon);
}

.page-about .about-principle-idx {
  display: block;
  margin-bottom: 10px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--mist);
  opacity: .68;
}

.page-about .about-principles-list p {
  margin-top: 9px;
  font-size: 14px;
  line-height: 1.74;
  color: var(--mist);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding: 6px 0 72px;
}

.page-about .about-cta-inner {
  display: grid;
  gap: 18px;
  padding: 24px 20px;
  background: rgba(255, 106, 43, .1);
  border: 1px solid var(--line);
  border-left: 4px solid var(--orange);
}

.page-about .about-cta-text {
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--paper);
}

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

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-lede {
    font-size: 17px;
  }

  .page-about .about-copy p,
  .page-about .about-team-copy p {
    font-size: 16px;
  }

  .page-about .about-cta-inner {
    padding: 28px 26px;
  }
}

@media (min-width: 820px) {
  .page-about .about-hero {
    padding: 12px 0 72px;
  }

  .page-about .about-origin {
    padding-bottom: 72px;
  }

  .page-about .about-timeline {
    padding: 72px 0;
  }

  .page-about .about-team {
    padding: 68px 0 72px;
  }

  .page-about .about-sources,
  .page-about .about-principles {
    padding: 72px 0;
  }

  .page-about .about-upkeep {
    padding: 68px 0 72px;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-principles-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
    padding: 30px 32px;
  }
}

@media (min-width: 900px) {
  .page-about .about-team-top {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 46px;
    align-items: center;
  }

  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-sources-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: 52px;
    align-items: center;
  }

  .page-about .about-upkeep-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 52px;
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 54px;
    align-items: start;
  }

  .page-about .about-facts {
    margin-top: 52px;
  }

  .page-about .about-tl-card summary {
    padding: 18px 50px 18px 20px;
  }

  .page-about .about-tl-card summary h3 {
    font-size: 18px;
  }

  .page-about .about-tl-detail {
    margin: 0 20px;
    font-size: 15px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-tl-wrap {
    grid-template-columns: minmax(0, 1fr) 214px;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-tl-notes {
    position: sticky;
    top: 88px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl-card,
  .page-about .about-roles .about-role,
  .page-about .about-tl-notes a {
    transition: none;
  }

  .page-about .about-tl-card:hover,
  .page-about .about-roles .about-role:hover {
    transform: none;
  }
}
<<<END>>>