.page-about {
  --about-pad: clamp(48px, 7vw, 96px);
  --about-line-dark: rgba(244, 241, 236, 0.16);
  --about-line-ink: rgba(16, 24, 32, 0.14);
  --about-soft: rgba(244, 241, 236, 0.76);
  background: var(--paper-100);
  color: var(--ink-text);
}

.page-about .about-crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 14px 0 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--muted);
  background: var(--ink-900);
}

.page-about .about-crumbs li + li::before {
  content: "/";
  margin-inline-end: 8px;
  color: rgba(244, 241, 236, 0.4);
}

.page-about .about-crumbs a {
  color: rgba(244, 241, 236, 0.7);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .about-crumbs a:hover {
  border-bottom-color: var(--red-500);
}

.page-about .about-crumbs li[aria-current="page"] {
  color: var(--paper-100);
}

.page-about .eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--red-700);
}

.page-about .h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.page-about .serif {
  font-family: var(--font-serif);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(28px, 5vw, 48px) clamp(44px, 7vw, 88px);
  background:
    repeating-linear-gradient(100deg, rgba(44, 65, 96, 0.32) 0 1px, transparent 1px 42px),
    var(--ink-900);
  color: var(--paper-100);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--red-500) 0 38%, rgba(225, 43, 50, 0.12) 38% 100%);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
  align-items: start;
}

.page-about .about-hero .eyebrow {
  color: var(--cyan-400);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(34px, 6.6vw, 64px);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.025em;
}

.page-about .about-hero__lede {
  max-width: 30em;
  margin: 20px 0 0;
  font-size: var(--fs-17);
  line-height: 1.75;
  color: var(--about-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-duty {
  border: 1px solid var(--ink-500);
  background: rgba(22, 38, 63, 0.86);
  padding: 20px clamp(16px, 3vw, 26px) 18px;
}

.page-about .about-duty__head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--green-500);
}

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

.page-about .about-duty__list li {
  display: grid;
  grid-template-columns: 2.6em minmax(0, 1fr);
  column-gap: 14px;
  padding-block: 13px;
  border-bottom: 1px solid var(--about-line-dark);
}

.page-about .about-duty__num {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: var(--fs-21);
  line-height: 1.1;
  color: var(--cyan-400);
}

.page-about .about-duty__name {
  font-size: var(--fs-15);
  font-weight: 500;
}

.page-about .about-duty__note {
  font-size: var(--fs-13);
  line-height: 1.5;
  color: rgba(244, 241, 236, 0.6);
}

.page-about .about-duty__total {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: rgba(244, 241, 236, 0.6);
}

.page-about .about-duty__sum {
  font-size: var(--fs-40);
  line-height: 1;
  color: var(--paper-100);
}

.page-about .about-duty__foot {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--about-line-dark);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: rgba(244, 241, 236, 0.45);
}

/* ---------- 起点与沿革 ---------- */

.page-about .about-origin {
  padding-block: var(--about-pad);
  background: var(--paper-100);
}

.page-about .about-origin__grid {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
}

.page-about .about-origin__body p {
  max-width: 34em;
  margin: 18px 0 0;
  font-size: var(--fs-17);
  line-height: 1.75;
  color: var(--ink-text);
}

.page-about .about-origin__lead {
  font-size: var(--fs-21) !important;
  line-height: 1.6 !important;
  color: var(--ink-text) !important;
}

.page-about .about-aside__title {
  margin: 0 0 6px;
  font-size: var(--fs-21);
  font-weight: 600;
  color: var(--ink-text);
}

.page-about .about-phases {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line-ink);
}

.page-about .about-phases li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding-block: 16px;
  border-bottom: 1px solid var(--about-line-ink);
}

.page-about .about-phases__year {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--red-700);
}

.page-about .about-phases p {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 团队分工 ---------- */

.page-about .about-crew {
  padding-block: var(--about-pad);
  background: var(--ink-900);
  color: var(--paper-100);
}

.page-about .about-crew .eyebrow {
  color: var(--cyan-400);
}

.page-about .about-sec-head {
  max-width: 46em;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-sec-head__lede {
  max-width: 34em;
  margin: 16px 0 0;
  font-size: var(--fs-17);
  line-height: 1.75;
  color: var(--about-soft);
}

.page-about .about-sec-head--ink .about-sec-head__lede {
  color: var(--muted);
}

.page-about .about-figure {
  margin: 0 0 clamp(28px, 4vw, 44px);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--ink-500);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: var(--fs-13);
  line-height: 1.6;
  color: rgba(244, 241, 236, 0.55);
}

.page-about .about-crew__grid {
  display: grid;
  gap: 16px;
}

.page-about .about-crew__card {
  border: 1px solid var(--ink-500);
  background: rgba(22, 38, 63, 0.72);
}

.page-about .about-crew__card summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto auto;
  align-items: baseline;
  gap: 12px;
  padding: 18px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-crew__card summary::after {
  content: "＋";
  font-family: var(--font-mono);
  font-size: var(--fs-15);
  color: var(--red-500);
}

.page-about .about-crew__card[open] summary::after {
  content: "−";
}

.page-about .about-crew__card summary:hover {
  background: rgba(44, 65, 96, 0.4);
}

.page-about .about-crew__card summary:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: -3px;
}

.page-about .about-crew__no {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--red-500);
}

.page-about .about-crew__name {
  font-family: var(--font-serif);
  font-size: var(--fs-21);
  font-weight: 600;
  letter-spacing: 0.01em;
}

.page-about .about-crew__count {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--cyan-400);
}

.page-about .about-crew__body {
  padding: 0 18px 20px;
  border-top: 1px solid var(--about-line-dark);
  margin-top: 2px;
  padding-top: 16px;
}

.page-about .about-crew__text {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.7;
  color: var(--about-soft);
}

.page-about .about-crew__list {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-crew__list li {
  position: relative;
  padding-inline-start: 18px;
  margin-top: 8px;
  font-size: var(--fs-15);
  line-height: 1.6;
  color: rgba(244, 241, 236, 0.68);
}

.page-about .about-crew__list li::before {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  top: 0.68em;
  width: 8px;
  height: 1px;
  background: var(--red-500);
}

/* ---------- 采集到发布 ---------- */

.page-about .about-flow {
  padding-block: var(--about-pad);
  background: var(--paper-100);
}

.page-about .about-chain {
  display: grid;
  gap: 26px;
  margin: 0 0 clamp(32px, 5vw, 56px);
  padding: 0;
  list-style: none;
}

.page-about .about-chain__step {
  position: relative;
  padding-top: 22px;
  border-top: 1px solid var(--about-line-ink);
}

.page-about .about-chain__step::before {
  content: "";
  position: absolute;
  top: -4px;
  inset-inline-start: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--red-500);
}

.page-about .about-chain__no {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--red-700);
}

.page-about .about-chain__title {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-size: var(--fs-28);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-chain__step p {
  max-width: 32em;
  margin: 10px 0 0;
  font-size: var(--fs-15);
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-flow__lower {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .about-flow__note-title {
  margin: 0 0 10px;
  font-size: var(--fs-21);
  font-weight: 600;
}

.page-about .about-flow__note p {
  max-width: 34em;
  margin: 12px 0 0;
  font-size: var(--fs-15);
  line-height: 1.75;
  color: var(--ink-text);
}

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

.page-about .about-figure--tight img {
  border-color: var(--about-line-ink);
}

.page-about .about-figure--tight figcaption {
  color: var(--muted);
}

.page-about .about-inline-link {
  color: var(--red-700);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  font-size: var(--fs-15);
}

.page-about .about-inline-link:hover {
  color: var(--red-500);
}

/* ---------- 里程碑 ---------- */

.page-about .about-track-sec {
  padding-block: var(--about-pad);
  background: var(--ink-900);
  color: var(--paper-100);
}

.page-about .about-track-sec .eyebrow {
  color: var(--cyan-400);
}

.page-about .about-banner {
  margin: 0 0 clamp(32px, 5vw, 56px);
}

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

.page-about .about-banner figcaption {
  margin-top: 10px;
  font-family: var(--font-serif);
  font-size: var(--fs-13);
  color: rgba(244, 241, 236, 0.5);
}

.page-about .about-tabs .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: clamp(24px, 4vw, 36px);
  border-bottom: 1px solid var(--ink-500);
}

.page-about .about-tabs .tabs__tab {
  appearance: none;
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  padding: 12px 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: rgba(244, 241, 236, 0.58);
  cursor: pointer;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-tabs .tabs__tab:hover {
  color: var(--paper-100);
}

.page-about .about-tabs .tabs__tab[aria-selected="true"] {
  color: var(--paper-100);
  border-bottom-color: var(--red-500);
}

.page-about .about-tabs .tabs__tab:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 2px;
}

.page-about .about-track {
  position: relative;
  margin: 0;
  padding: 4px 0 0 24px;
  list-style: none;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  inset-inline-start: 5px;
  top: 10px;
  bottom: 4px;
  width: 1px;
  background: var(--ink-500);
}

.page-about .about-track__item {
  position: relative;
  padding-bottom: 26px;
  opacity: 1;
  transform: none;
  transition: opacity 280ms var(--ease), transform 280ms var(--ease);
}

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  inset-inline-start: -23px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 1px solid var(--ink-500);
  background: var(--ink-900);
  transition: background 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .about-track__item.is-visible::before {
  background: var(--red-500);
  border-color: var(--red-500);
}

.page-about .about-track__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  margin: 0;
}

.page-about .about-track__time {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--cyan-400);
}

.page-about .about-track__title {
  font-family: var(--font-display);
  font-size: var(--fs-21);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: rgba(244, 241, 236, 0.86);
  transition: font-weight 160ms var(--ease), color 160ms var(--ease);
}

.page-about .about-track__item.is-visible .about-track__title {
  font-weight: 800;
  color: var(--paper-100);
}

.page-about .about-track__text {
  max-width: 34em;
  margin: 8px 0 0;
  font-size: var(--fs-15);
  line-height: 1.7;
  color: rgba(244, 241, 236, 0.66);
}

/* ---------- 用户构成 ---------- */

.page-about .about-users {
  padding-block: var(--about-pad);
  background: var(--paper-100);
}

.page-about .about-users__grid {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
}

.page-about .about-users__lead {
  max-width: 34em;
  margin: 18px 0 0;
  font-size: var(--fs-17);
  line-height: 1.75;
}

.page-about .about-bars {
  margin-top: 32px;
}

.page-about .about-bars__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .about-bars__bar {
  display: flex;
  height: 38px;
  border: 1px solid var(--ink-text);
}

.page-about .about-bars__seg {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
}

.page-about .about-bars__seg--tablet {
  width: 41%;
  background: var(--red-500);
  color: #fff;
}

.page-about .about-bars__seg--rest {
  width: 59%;
  color: var(--ink-text);
  border-inline-start: 1px solid var(--ink-text);
}

.page-about .about-bars__legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  font-size: var(--fs-13);
  color: var(--muted);
}

.page-about .about-bars__legend li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-bars__key {
  width: 12px;
  height: 12px;
  border: 1px solid var(--ink-text);
}

.page-about .about-bars__key--tablet {
  background: var(--red-500);
  border-color: var(--red-500);
}

.page-about .about-figures {
  display: grid;
  gap: 1px;
  margin: 32px 0 0;
  padding: 0;
  background: var(--about-line-ink);
  border: 1px solid var(--about-line-ink);
}

.page-about .about-figures__item {
  background: var(--paper-100);
  padding: 16px 18px;
}

.page-about .about-figures dt {
  font-size: var(--fs-13);
  color: var(--muted);
}

.page-about .about-figures dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 32px);
  line-height: 1.1;
  color: var(--ink-text);
}

.page-about .about-users__aside {
  padding-top: 20px;
  border-top: 2px solid var(--red-500);
}

.page-about .about-users__aside p {
  max-width: 34em;
  margin: 12px 0 0;
  font-size: var(--fs-15);
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 联系 ---------- */

.page-about .about-contact {
  padding-block: var(--about-pad);
  background: var(--ink-700);
  color: var(--paper-100);
}

.page-about .about-contact .eyebrow {
  color: var(--cyan-400);
}

.page-about .about-contact__inner {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .about-contact__copy p {
  max-width: 34em;
  margin: 16px 0 0;
  font-size: var(--fs-17);
  line-height: 1.75;
  color: var(--about-soft);
}

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

.page-about .about-contact__panel {
  border: 1px solid var(--ink-500);
  background: rgba(11, 21, 38, 0.45);
  padding: 8px 20px;
}

.page-about .about-contact__list {
  margin: 0;
}

.page-about .about-contact__row {
  display: grid;
  gap: 4px;
  padding-block: 14px;
  border-bottom: 1px solid var(--about-line-dark);
}

.page-about .about-contact__row:last-child {
  border-bottom: 0;
}

.page-about .about-contact__row dt {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: rgba(244, 241, 236, 0.5);
}

.page-about .about-contact__row dd {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.6;
  color: var(--paper-100);
  word-break: break-word;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-figures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-phases li {
    grid-template-columns: 8.5em minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }
}

@media (min-width: 860px) {
  .page-about .about-chain {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .about-chain__step {
    padding: 24px 26px 0 0;
    border-top: 1px solid var(--about-line-ink);
    border-inline-end: 1px solid var(--about-line-ink);
  }

  .page-about .about-chain__step:last-child {
    border-inline-end: 0;
    padding-inline-end: 0;
  }

  .page-about .about-chain__step::after {
    content: "";
    position: absolute;
    top: -4px;
    inset-inline-end: 8px;
    width: 7px;
    height: 7px;
    border-top: 1px solid var(--red-500);
    border-right: 1px solid var(--red-500);
    transform: rotate(45deg);
  }

  .page-about .about-chain__step:last-child::after {
    display: none;
  }

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

  .page-about .about-crew__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .about-crew__card:nth-child(1) {
    grid-column: 1 / span 5;
  }

  .page-about .about-crew__card:nth-child(2) {
    grid-column: 7 / span 6;
    margin-top: 44px;
  }

  .page-about .about-crew__card:nth-child(3) {
    grid-column: 1 / span 5;
  }

  .page-about .about-crew__card:nth-child(4) {
    grid-column: 7 / span 6;
    margin-top: 44px;
  }

  .page-about .about-contact__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

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

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

  .page-about .about-users__aside {
    padding-top: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tabs .tabs__tab,
  .page-about .about-track__item,
  .page-about .about-track__item::before,
  .page-about .about-track__title {
    transition: none;
  }
}
<<<END>>>