.page-about {
  --rail-pad: 34px;
  --rail-line-x: 12px;
  --about-rule: 1.5px solid var(--paper-2);
}

@media (min-width: 760px) {
  .page-about {
    --rail-pad: 58px;
  }
}

/* ---------- 首屏 ---------- */
.page-about .about-masthead {
  position: relative;
  padding-top: clamp(24px, 3.4vw, 44px);
  padding-bottom: clamp(34px, 5vw, 64px);
  border-bottom: var(--line-strong);
  overflow: hidden;
}

.page-about .about-masthead::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: clamp(72px, 14vw, 210px);
  height: 6px;
  background: var(--orange);
}

.page-about .about-masthead-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  align-items: start;
  margin-top: clamp(20px, 3.4vw, 40px);
}

@media (min-width: 820px) {
  .page-about .about-masthead-grid {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 48px;
    align-items: center;
  }
}

.page-about .about-h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.4vw, 60px);
  line-height: 1.07;
  letter-spacing: -0.02em;
  margin: 12px 0 18px;
  max-width: 15ch;
}

.page-about .about-lede {
  font-size: 16.5px;
  line-height: 1.78;
  max-width: 36em;
  margin: 0 0 12px;
}

.page-about .about-lede--sub {
  color: var(--ink-soft);
  font-size: 15.5px;
  margin-bottom: 0;
}

.page-about .about-lede a,
.page-about .about-prose a,
.page-about .about-standards a,
.page-about .about-limits a {
  color: var(--orange-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1.5px;
}

.page-about .about-lede a:hover,
.page-about .about-prose a:hover,
.page-about .about-standards a:hover,
.page-about .about-limits a:hover {
  color: var(--ink);
  background: var(--note);
}

/* ---------- 印章 ---------- */
.page-about .about-seal {
  position: relative;
  width: 132px;
  height: 132px;
  flex: 0 0 auto;
  border-radius: 50%;
  border: 2.5px solid var(--orange);
  display: grid;
  place-items: center;
  transform: rotate(-7deg);
  color: var(--orange-deep);
  background: var(--paper);
}

.page-about .about-seal-ring {
  position: absolute;
  inset: 9px;
  border-radius: 50%;
  border: 1px dashed var(--orange);
  opacity: .75;
  pointer-events: none;
}

.page-about .about-seal-txt {
  display: grid;
  gap: 2px;
  text-align: center;
  line-height: 1.1;
}

.page-about .about-seal-top,
.page-about .about-seal-bot {
  font-size: 11px;
  letter-spacing: 0.16em;
}

.page-about .about-seal-date {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

@media (min-width: 820px) {
  .page-about .about-seal {
    width: 158px;
    height: 158px;
  }
  .page-about .about-seal-date {
    font-size: 26px;
  }
}

/* ---------- 竖向时间轴骨架 ---------- */
.page-about .about-rail {
  position: relative;
  padding-top: clamp(30px, 4vw, 54px);
}

.page-about .about-rail::before {
  content: "";
  position: absolute;
  left: var(--rail-line-x);
  top: 0;
  bottom: 0;
  width: 2px;
  background-image: repeating-linear-gradient(
    180deg,
    var(--ink) 0 6px,
    transparent 6px 13px
  );
  opacity: .28;
  pointer-events: none;
}

.page-about .about-section {
  position: relative;
  padding-left: var(--rail-pad);
  padding-bottom: clamp(44px, 6vw, 84px);
}

.page-about .about-section:last-of-type {
  padding-bottom: clamp(56px, 7vw, 100px);
}

.page-about .about-head {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  margin-left: calc(var(--rail-pad) * -1);
  margin-bottom: 16px;
}

.page-about .about-node {
  flex: 0 0 auto;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid var(--ink);
  background: var(--paper);
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
  z-index: 2;
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 3.2vw, 31px);
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin: 0;
}

.page-about .about-section-lede {
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--ink-soft);
  max-width: 36em;
  margin: 0 0 22px;
}

/* ---------- 01 自述 ---------- */
.page-about .about-cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

@media (min-width: 900px) {
  .page-about .about-cols {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 40px;
    align-items: start;
  }
}

.page-about .about-prose p {
  font-size: 16.5px;
  line-height: 1.78;
  margin: 0 0 1.15em;
  max-width: 38em;
}

.page-about .about-prose p:last-child {
  margin-bottom: 0;
}

.page-about .about-note-col {
  display: grid;
  gap: 14px;
  align-content: start;
  padding-top: 4px;
}

.page-about .note-hand {
  margin: 0;
  background: var(--note);
  color: var(--ink);
  border: 1.5px solid var(--ink);
  padding: 10px 13px;
  font-size: 13.5px;
  line-height: 1.5;
  transform: rotate(-2deg);
  box-shadow: 3px 3px 0 var(--ink);
}

.page-about .note-hand--blue {
  background: var(--paper);
  border-color: var(--blue);
  color: var(--blue);
  box-shadow: 3px 3px 0 var(--blue);
  transform: rotate(1.6deg);
}

/* ---------- 02 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl-item {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 14px;
  padding: 15px 0;
  border-top: var(--about-rule);
}

.page-about .tl-item:first-child {
  border-top: 2px solid var(--ink);
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--orange-deep);
  padding-top: 3px;
}

.page-about .tl-title {
  font-family: var(--font-display);
  font-size: 16.5px;
  font-weight: 800;
  line-height: 1.35;
  margin: 0 0 4px;
}

.page-about .tl-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-soft);
  max-width: 34em;
}

.page-about .tl-item--current {
  background: linear-gradient(90deg, rgba(232, 69, 43, .09), transparent 62%);
}

.page-about .tl-item--current .tl-year {
  color: var(--orange);
}

.page-about .tl-item--current .tl-title {
  color: var(--orange-deep);
}

@media (min-width: 760px) {
  .page-about .tl-item {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 20px;
    padding: 18px 0;
  }
  .page-about .tl-year {
    font-size: 14px;
  }
}

/* ---------- 03 团队 ---------- */
.page-about .about-team {
  position: relative;
  padding: clamp(24px, 3.4vw, 46px);
  overflow: hidden;
}

.page-about .about-team::before {
  content: "";
  position: absolute;
  top: -30px;
  right: -30px;
  width: 150px;
  height: 150px;
  border: 2px solid rgba(246, 242, 234, .22);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .about-team-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

@media (min-width: 960px) {
  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 42px;
    align-items: start;
  }
}

.page-about .about-team-lede {
  font-size: 16.5px;
  line-height: 1.72;
  margin: 0 0 22px;
  max-width: 34em;
}

.page-about .about-team-caption {
  text-align: left;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(246, 242, 234, .72);
  padding-bottom: 10px;
}

.page-about .about-team .table-print {
  width: 100%;
  border-collapse: collapse;
  color: var(--paper);
  border: 2px solid rgba(246, 242, 234, .55);
  font-size: 14.5px;
}

.page-about .about-team .table-print th,
.page-about .about-team .table-print td {
  border: 1.5px solid rgba(246, 242, 234, .3);
  padding: 11px 12px;
  text-align: left;
  vertical-align: top;
  line-height: 1.55;
}

.page-about .about-team .table-print thead th {
  background: rgba(246, 242, 234, .14);
  font-size: 12px;
  letter-spacing: 0.08em;
  font-weight: 700;
}

.page-about .about-team .table-print tbody th[scope="row"] {
  font-weight: 700;
  white-space: nowrap;
  width: 5.6em;
}

.page-about .about-team .table-print tbody td.t-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 17px;
  font-weight: 700;
  color: var(--note);
  white-space: nowrap;
  width: 4em;
}

.page-about .about-team .table-print tbody tr {
  transition: background-color 180ms var(--ease);
}

.page-about .about-team .table-print tbody tr:hover {
  background: rgba(232, 69, 43, .2);
}

.page-about .about-team-note {
  margin: 20px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(246, 242, 234, .82);
  max-width: 38em;
}

.page-about .about-team-fig {
  border-color: var(--paper);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, .28);
  margin: 0;
}

.page-about .about-team-fig .media-caption {
  background: var(--paper);
  color: var(--ink);
  margin: 0;
  padding: 8px 10px;
  font-size: 12.5px;
}

/* ---------- 04 规范与版本 ---------- */
.page-about .about-standards {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding-top: 8px;
}

@media (min-width: 940px) {
  .page-about .about-standards {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 40px;
    align-items: start;
  }
}

.page-about .about-standards-body {
  position: relative;
  z-index: 1;
}

.page-about .about-standards-lede {
  font-size: 16.5px;
  line-height: 1.78;
  margin: 0 0 22px;
  max-width: 38em;
}

.page-about .about-vers {
  margin: 0 0 22px;
  border-top: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
}

.page-about .about-vers-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 3px;
  padding: 12px 0;
  border-bottom: var(--about-rule);
}

.page-about .about-vers-row:last-child {
  border-bottom: none;
}

@media (min-width: 560px) {
  .page-about .about-vers-row {
    grid-template-columns: 10.5em minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }
}

.page-about .about-vers-row dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  font-weight: 700;
}

.page-about .about-vers-row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
}

.page-about .about-vers-row dd .t-num {
  font-size: 14px;
  font-weight: 700;
  color: var(--green);
}

.page-about .about-standards-foot {
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
  max-width: 36em;
  margin: 0;
}

.page-about .about-standards-fig {
  margin: 0;
  transform: rotate(-2.2deg);
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-paper);
}

.page-about .about-standards-fig .media-caption {
  background: var(--paper);
  color: var(--ink-soft);
  margin: 0;
  padding: 8px 10px;
  font-size: 12.5px;
}

.page-about .ticket-watermark {
  font-family: var(--font-mono);
  font-size: clamp(38px, 9vw, 92px);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--green);
  opacity: .07;
  top: -6px;
  right: -1vw;
  white-space: nowrap;
  pointer-events: none;
  user-select: none;
}

/* ---------- 05 覆盖区域 ---------- */
.page-about .about-coverage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.page-about .about-coverage-text p {
  font-size: 16.5px;
  line-height: 1.78;
  margin: 0 0 1.1em;
  max-width: 38em;
}

.page-about .about-zone-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .about-zone-list li {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  padding: 5px 11px;
  border: 1.5px solid var(--green);
  color: var(--green);
  background: rgba(20, 72, 60, .06);
}

.page-about .about-coverage-fig {
  margin: 0;
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-paper);
}

.page-about .about-coverage-fig .media-caption {
  background: var(--paper);
  color: var(--ink-soft);
  margin: 0;
  padding: 8px 10px;
  font-size: 12.5px;
}

/* ---------- 06 我们不做的事 ---------- */
.page-about .about-limits {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: lim;
  border-left: 4px solid var(--wine);
}

.page-about .about-limits li {
  position: relative;
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 12px;
  padding: 14px 0 14px 16px;
  border-bottom: var(--about-rule);
}

.page-about .about-limits li:last-child {
  border-bottom: none;
}

.page-about .lim-mark {
  width: 13px;
  height: 13px;
  margin-top: 5px;
  border: 2px solid var(--wine);
  display: block;
}

.page-about .about-limits strong {
  display: block;
  font-family: var(--font-display);
  font-size: 16.5px;
  font-weight: 800;
  line-height: 1.45;
  margin-bottom: 4px;
}

.page-about .about-limits p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink-soft);
  max-width: 36em;
}

.page-about .about-limits-foot {
  margin: 22px 0 0;
  font-size: 15px;
  line-height: 1.75;
  padding: 14px 16px;
  background: var(--paper-2);
  border: 1.5px solid var(--ink);
  max-width: 40em;
}

/* ---------- 桌面浮动索引 ---------- */
.page-about .about-index {
  display: none;
}

@media (min-width: 1680px) {
  .page-about .about-index {
    display: block;
    position: fixed;
    top: 148px;
    right: 40px;
    width: 152px;
    z-index: 6;
    border-top: 2px solid var(--ink);
    padding-top: 10px;
    background: var(--paper);
  }

  .page-about .about-index-title {
    margin: 0 0 10px;
    font-size: 11px;
    letter-spacing: 0.14em;
    color: var(--ink-soft);
    text-transform: uppercase;
  }

  .page-about .about-index ol {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 8px;
  }

  .page-about .about-index a {
    display: block;
    font-size: 12.5px;
    line-height: 1.45;
    color: var(--ink-soft);
    text-decoration: none;
    padding-left: 8px;
    border-left: 2px solid var(--paper-2);
    transition: border-color 160ms var(--ease), color 160ms var(--ease);
  }

  .page-about .about-index a:hover,
  .page-about .about-index a:focus-visible {
    color: var(--orange-deep);
    border-left-color: var(--orange);
  }
}

/* ---------- 通用细节 ---------- */
.page-about .media-frame {
  max-width: 100%;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.82);
}

.page-about :focus-visible {
  outline: 2.5px solid var(--orange);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .table-print tbody tr,
  .page-about .about-index a {
    transition: none;
  }
  .page-about .about-seal {
    transform: none;
  }
  .page-about .about-standards-fig {
    transform: none;
  }
  .page-about .note-hand,
  .page-about .note-hand--blue {
    transform: none;
  }
}
<<<END>>>