.page-about {
  --about-soft: #3E444E;
  --about-card: #FFFFFF;
  --about-radius: 22px 6px 18px 6px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about p {
  margin: 0 0 16px;
  max-width: 66ch;
}

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

.page-about h2 {
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: -0.02em;
  font-size: clamp(26px, 5vw, 42px);
  line-height: 1.16;
  margin: 8px 0 18px;
  max-width: 22ch;
}

.page-about h3 {
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: -0.01em;
  font-size: clamp(19px, 3.4vw, 25px);
  line-height: 1.24;
  margin: 0 0 10px;
}

.page-about .about-crumb {
  padding: 18px 0 6px;
}

.page-about .about-link {
  display: inline-block;
  margin-top: 6px;
  color: var(--blue);
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--red);
  border-bottom-color: var(--red);
}

.page-about .about-link:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding: clamp(14px, 3vw, 26px) 0 clamp(36px, 6vw, 72px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(90deg, rgba(11, 13, 16, 0.05) 0 1px, transparent 1px 92px),
    linear-gradient(102deg, transparent 56%, rgba(200, 16, 46, 0.07) 56%),
    linear-gradient(102deg, transparent 74%, rgba(47, 107, 255, 0.06) 74%);
  pointer-events: none;
}

.page-about .about-hero > .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: -0.02em;
  font-size: clamp(31px, 7vw, 62px);
  line-height: 1.08;
  margin: 10px 0 clamp(22px, 3.4vw, 36px);
  max-width: 19ch;
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--red);
  box-shadow: inset 0 -0.18em 0 rgba(255, 197, 61, 0.6);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
}

.page-about .about-hero__lead {
  font-size: clamp(17px, 2.4vw, 20px);
  color: var(--about-soft);
  margin: 0;
}

.page-about .about-figures {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-figures__item {
  border-left: 3px solid var(--red);
  padding: 8px 0 8px 12px;
  background: linear-gradient(180deg, rgba(232, 235, 240, 0.7), rgba(232, 235, 240, 0));
  border-radius: 0 var(--r-tag) var(--r-tag) 0;
}

.page-about .about-figures__num {
  display: block;
  font-size: clamp(23px, 4vw, 31px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-figures__label {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

/* 区块节奏 */
.page-about .about-section {
  padding: clamp(40px, 6vw, 84px) 0;
}

.page-about .about-section--grey {
  background: var(--grey);
}

.page-about .about-section--tight {
  padding: clamp(34px, 5vw, 60px) 0 clamp(46px, 6vw, 80px);
}

.page-about .about-section__intro {
  font-size: clamp(16px, 2.2vw, 18px);
  color: var(--about-soft);
}

/* 图文分栏 */
.page-about .about-split {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
  align-items: start;
}

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

.page-about .about-split__media .media__img {
  width: 100%;
  border-radius: var(--r-shot);
  object-fit: cover;
  box-shadow: var(--shadow);
}

.page-about .about-split__media .media__caption,
.page-about .about-figure .media__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* 四条内容线 */
.page-about .about-lines {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-line {
  background: var(--about-card);
  border-top: 3px solid var(--red);
  border-radius: var(--r-card);
  padding: 20px 18px 22px;
  box-shadow: 0 6px 18px rgba(11, 13, 16, 0.06);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-line:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.page-about .about-line--blue { border-top-color: var(--blue); }
.page-about .about-line--yellow { border-top-color: var(--yellow); }
.page-about .about-line--green { border-top-color: var(--green); }

.page-about .about-line__idx {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--blue);
}

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

.page-about .about-line .tag {
  display: inline-block;
  margin-top: 14px;
}

/* 表格 */
.page-about .table-scroll {
  margin-top: clamp(18px, 3vw, 28px);
  max-height: 62vh;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--line);
  border-radius: var(--r-tag);
  background: var(--about-card);
}

.page-about .table-scroll:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

.page-about .about-table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  font-size: 15px;
  line-height: 1.65;
}

.page-about .about-table caption {
  caption-side: top;
  text-align: left;
  padding: 12px 14px;
  font-size: 13px;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}

.page-about .about-table thead th {
  position: sticky;
  top: 0;
  z-index: 2;
  background: var(--deep);
  color: #FFFFFF;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-align: left;
  padding: 12px 14px;
  white-space: nowrap;
}

.page-about .about-table tbody th {
  text-align: left;
  font-weight: 700;
  padding: 12px 14px;
  color: var(--ink);
  white-space: nowrap;
}

.page-about .about-table td {
  padding: 12px 14px;
  color: var(--about-soft);
  vertical-align: top;
}

.page-about .about-table tbody tr:nth-child(even) {
  background: rgba(232, 235, 240, 0.6);
}

.page-about .about-table tbody tr:hover {
  background: var(--ice);
}

.page-about .about-figure {
  margin: clamp(22px, 3.4vw, 34px) 0 0;
}

.page-about .about-figure .media__img {
  width: 100%;
  border-radius: var(--r-shot);
  object-fit: cover;
}

/* 编辑流程 */
.page-about .about-metrics {
  list-style: none;
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
}

.page-about .about-metrics li {
  background: rgba(255, 255, 255, 0.85);
  border-left: 3px solid var(--blue);
  border-radius: 0 var(--r-tag) var(--r-tag) 0;
  padding: 10px 12px;
}

.page-about .about-metrics .metric__value {
  display: block;
  font-size: 22px;
  line-height: 1.2;
  color: var(--ink);
}

.page-about .about-metrics .metric__label {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

/* 时间线 */
.page-about .timeline {
  list-style: none;
  position: relative;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 4px 0 4px 30px;
}

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

.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(22px, 3.4vw, 34px);
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 9px;
  width: 14px;
  height: 14px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--paper);
  border: 3px solid var(--red);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .timeline__item:hover::before,
.page-about .timeline__item:focus-within::before {
  background: var(--red);
  transform: scale(1.14);
}

.page-about .timeline__year {
  display: block;
  font-size: clamp(23px, 4.2vw, 31px);
  line-height: 1;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
  color: var(--ink);
  transition: color var(--dur) var(--ease);
}

.page-about .timeline__item:hover .timeline__year {
  color: var(--red);
}

.page-about .timeline__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--about-soft);
}

/* 合作生态 */
.page-about .about-roles {
  display: grid;
  gap: 14px;
  margin: clamp(20px, 3vw, 30px) 0 clamp(18px, 2.6vw, 26px);
}

.page-about .about-role {
  background: var(--about-card);
  border-radius: var(--r-card);
  padding: 20px 18px;
  border-top: 2px solid var(--line);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-role:hover {
  border-top-color: var(--red);
  transform: translateY(-2px);
}

.page-about .about-role__kicker {
  display: block;
  margin-bottom: 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--blue);
}

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

/* 原则卡 */
.page-about .principles {
  display: grid;
  gap: 16px;
  margin-top: clamp(18px, 3vw, 30px);
}

.page-about .principle {
  background: var(--about-card);
  border: 1px solid var(--line);
  border-left: 4px solid var(--red);
  border-radius: var(--about-radius);
  padding: 22px 20px;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .principle:hover {
  box-shadow: var(--shadow);
}

.page-about .principle--order { border-left-color: var(--blue); }
.page-about .principle--trace { border-left-color: var(--yellow); }

.page-about .principle__kicker {
  display: block;
  margin-bottom: 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .principle p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--about-soft);
}

.page-about .principle details {
  margin-top: 12px;
  border-top: 1px dashed var(--line);
  padding-top: 12px;
}

.page-about .principle summary {
  cursor: pointer;
  font-size: 14px;
  font-weight: 700;
  color: var(--blue);
  list-style: none;
}

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

.page-about .principle summary::before {
  content: "＋ ";
  font-family: var(--font-mono);
}

.page-about .principle details[open] summary::before {
  content: "－ ";
}

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

.page-about .principle details p {
  margin: 10px 0 0;
  font-size: 14px;
}

/* 相关入口 */
.page-about .about-next__title {
  margin-bottom: clamp(16px, 2.4vw, 24px);
}

.page-about .about-next {
  display: grid;
  gap: 12px;
}

.page-about .next-card {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--about-card);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  padding: 18px;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--red);
  background: var(--ice);
}

.page-about .next-card:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

.page-about .next-card__label {
  display: block;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .next-card__title {
  display: block;
  margin-top: 6px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 19px;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

/* 响应式 */
@media (min-width: 640px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 700px) {
  .page-about .about-lines {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-next {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

  .page-about .about-split--rev {
    grid-template-columns: 5fr 7fr;
  }

  .page-about .about-split--rev .about-split__media {
    order: 0;
  }

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

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

  .page-about .principle:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .principle:nth-child(3) {
    margin-top: 52px;
  }

  .page-about .timeline {
    padding-left: 44px;
  }

  .page-about .timeline__item::before {
    left: -42px;
  }

  .page-about .timeline__year {
    font-size: 30px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: end;
  }

  .page-about .about-figures {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1040px) {
  .page-about .about-lines {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-line,
  .page-about .about-role,
  .page-about .principle,
  .page-about .next-card,
  .page-about .timeline__item::before,
  .page-about .timeline__year,
  .page-about .about-link {
    transition: none;
  }

  .page-about .about-line:hover,
  .page-about .about-role:hover,
  .page-about .principle:hover,
  .page-about .next-card:hover,
  .page-about .timeline__item:hover::before {
    transform: none;
  }
}
<<<END>>>