.page-about {
  --about-body: rgba(233, 237, 245, .84);
  --about-body-strong: #E9EDF5;
  --about-pad: 22px;
  padding: 20px 16px 56px;
}

.page-about a:focus-visible,
.page-about button:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--gold-500);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 26px;
  max-width: var(--content-max);
  margin: 0 auto;
}

.page-about .about-hero__text .breadcrumbs {
  margin-bottom: 14px;
}

.page-about .about-hero__text .eyebrow {
  color: var(--gold-300);
  margin: 0 0 12px;
  letter-spacing: .12em;
}

.page-about .about-hero__text .display-title {
  margin: 0 0 16px;
  color: var(--text);
}

.page-about .about-hero__text .lede {
  margin: 0 0 22px;
  max-width: 62ch;
  color: var(--about-body);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 26px;
}

.page-about .about-hero__visual {
  position: relative;
  min-height: 210px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  overflow: hidden;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at 72% 24%, rgba(217, 166, 43, .34), transparent 58%),
    radial-gradient(circle at 18% 82%, rgba(106, 76, 226, .3), transparent 55%),
    linear-gradient(152deg, var(--ink-700), var(--ink-900) 68%);
}

.page-about .about-hero__visual::after {
  content: "";
  position: absolute;
  inset: -40% -10% auto auto;
  width: 62%;
  height: 190%;
  background: linear-gradient(180deg, rgba(243, 206, 107, .14), transparent 62%);
  transform: rotate(18deg);
  pointer-events: none;
}

.page-about .about-emblem {
  position: relative;
  width: 148px;
  height: 148px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: rgba(11, 23, 41, .55);
}

.page-about .about-emblem__ring {
  position: absolute;
  inset: 12px;
  border-radius: 50%;
  border: 1px dashed rgba(243, 206, 107, .42);
}

.page-about .about-emblem__ring--inner {
  inset: 28px;
  border-style: solid;
  border-color: rgba(255, 106, 61, .34);
}

.page-about .about-emblem__seal {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 46px;
  line-height: 1;
  color: var(--gold-300);
}

.page-about .about-emblem__meta {
  position: absolute;
  bottom: 22px;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--slate-400);
}

/* ---------- 数据条 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px;
  background: var(--ink-900);
}

.page-about .about-stats__num {
  font-size: 19px;
  line-height: 1.2;
  color: var(--gold-300);
  letter-spacing: .02em;
}

.page-about .about-stats__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--slate-400);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-shell {
  display: grid;
  gap: 22px;
  max-width: var(--content-max);
  margin: 34px auto 0;
}

.page-about .about-toc {
  padding-left: 14px;
  border-left: 1px solid var(--line);
}

.page-about .about-toc__title {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--slate-400);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc__item {
  flex: 0 0 auto;
}

.page-about .about-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 11px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 12.5px;
  color: var(--text-dim);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-toc__index {
  font-size: 11px;
  color: var(--gold-500);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link[aria-current] {
  color: var(--gold-300);
  border-color: var(--gold-500);
  background: rgba(217, 166, 43, .1);
}

/* ---------- 章节 ---------- */
.page-about .about-body {
  min-width: 0;
}

.page-about .about-sec {
  position: relative;
  padding: 46px var(--about-pad) 34px;
  margin-bottom: 20px;
  border-radius: var(--radius);
  color: var(--about-body);
  clip-path: polygon(0 22px, 100% 0, 100% 100%, 0 100%);
}

.page-about .about-sec--ink {
  background: linear-gradient(164deg, var(--ink-700), var(--ink-900) 128%);
  border-top: 1px solid var(--line);
}

.page-about .about-sec--wine {
  background: linear-gradient(158deg, var(--wine-700), #4A1224 132%);
}

.page-about .about-sec--teal {
  background: linear-gradient(162deg, var(--teal-700), var(--ink-900) 136%);
}

.page-about .about-sec__index {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold-300);
}

.page-about .about-sec .section-title {
  margin: 0 0 16px;
  color: var(--about-body-strong);
  max-width: 24ch;
}

.page-about .about-sec p {
  margin: 0 0 15px;
  max-width: 64ch;
  line-height: 1.78;
  color: var(--about-body);
}

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

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 24px 0 0;
}

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

.page-about .about-figure figcaption {
  margin-top: 9px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--slate-400);
}

.page-about .about-figure--side {
  margin-top: 18px;
}

/* ---------- 三条准则 ---------- */
.page-about .rules {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 28px;
}

.page-about .rule {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding-top: 20px;
  border-top: 1px solid rgba(243, 206, 107, .26);
}

.page-about .rule__num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 38px;
  line-height: .9;
  color: var(--gold-500);
  letter-spacing: -.02em;
}

.page-about .rule__title {
  margin: 0 0 10px;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 17px;
  line-height: 1.45;
  color: var(--about-body-strong);
}

.page-about .rule__body p {
  margin: 0;
  font-size: 15px;
}

.page-about .rule__more {
  margin-top: 12px;
  border-top: 1px dashed rgba(243, 206, 107, .28);
  padding-top: 10px;
}

.page-about .rule__more summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 13px;
  color: var(--gold-300);
}

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

.page-about .rule__more summary::before {
  content: "＋ ";
  color: var(--orange-500);
}

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

.page-about .rule__more p {
  margin: 10px 0 0;
  font-size: 14px;
  color: var(--about-body);
}

/* ---------- 团队 ---------- */
.page-about .about-split {
  display: grid;
  gap: 20px;
}

.page-about .teams {
  display: grid;
  gap: 16px;
  margin-top: 22px;
}

.page-about .team {
  padding: 16px 16px 18px;
  border-left: 2px solid var(--gold-500);
  background: rgba(11, 23, 41, .38);
  border-radius: 0 var(--radius) var(--radius) 0;
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .team:nth-child(2) {
  border-left-color: var(--violet-500);
}

.page-about .team:nth-child(3) {
  border-left-color: var(--orange-500);
}

.page-about .team:hover {
  transform: translateY(-4px);
  background: rgba(11, 23, 41, .58);
}

.page-about .team__title {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 16px;
  color: var(--about-body-strong);
  letter-spacing: .02em;
}

.page-about .team__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-body);
}

/* ---------- 联系卡 ---------- */
.page-about .contact-card {
  padding: 18px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--glass);
}

.page-about .contact-card__title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--gold-300);
}

.page-about .contact-card__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
  padding: 11px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .contact-card__row:first-of-type {
  border-top: 0;
}

.page-about .contact-card__label {
  flex: 0 0 100%;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 700;
  color: var(--slate-400);
}

.page-about .contact-card__value {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--about-body-strong);
  word-break: break-word;
}

.page-about .contact-card__note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--slate-400);
}

.page-about .about-copy {
  padding: 5px 12px;
  border: 1px solid var(--gold-500);
  border-radius: 999px;
  background: transparent;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 12px;
  color: var(--gold-300);
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-copy:hover {
  background: var(--gold-500);
  color: var(--ink-900);
}

.page-about .about-copy[data-copied="true"] {
  background: var(--gold-500);
  color: var(--ink-900);
}

/* ---------- 时间线 ---------- */
.page-about .milestones {
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 12px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(196px, 1fr);
  gap: 0 18px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .milestone {
  position: relative;
  border-top: 1px solid var(--line);
  padding: 20px 6px 0 0;
}

.page-about .milestone__dot {
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold-500);
  box-shadow: 0 0 0 4px rgba(217, 166, 43, .16);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .milestone:hover .milestone__dot,
.page-about .milestone:focus-within .milestone__dot {
  transform: scale(1.6);
  box-shadow: 0 0 0 6px rgba(243, 206, 107, .24);
}

.page-about .milestone__title {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 14.5px;
  color: var(--about-body-strong);
}

.page-about .milestone__note {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--slate-400);
  transition: color var(--dur) var(--ease);
}

.page-about .milestone:hover .milestone__note,
.page-about .milestone:focus-within .milestone__note {
  color: var(--about-body);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  margin-top: 30px;
  padding: 32px var(--about-pad) 30px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: linear-gradient(136deg, var(--ink-800), var(--teal-700) 190%);
}

.page-about .about-cta .section-title {
  margin: 0 0 10px;
  color: var(--about-body-strong);
}

.page-about .about-cta__lede {
  margin: 0 0 22px;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.7;
  color: var(--about-body);
}

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

.page-about .about-cta__link {
  display: block;
  padding: 16px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  text-decoration: none;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-cta__link:hover {
  transform: translateY(-4px);
  border-color: var(--gold-500);
  background: rgba(217, 166, 43, .08);
}

.page-about .about-cta__link-title {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 15px;
  color: var(--gold-300);
}

.page-about .about-cta__link-desc {
  display: block;
  font-size: 13px;
  line-height: 1.65;
  color: var(--about-body);
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 760px) {
  .page-about {
    --about-pad: 34px;
  }

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

  .page-about .about-sec {
    clip-path: polygon(0 30px, 100% 0, 100% 100%, 0 100%);
    padding-top: 56px;
    padding-bottom: 42px;
    margin-bottom: 24px;
  }

  .page-about .rule__num {
    font-size: 52px;
  }

  .page-about .rule {
    gap: 22px;
  }

  .page-about .teams {
    grid-template-columns: 1.2fr .92fr 1fr;
    align-items: start;
  }

  .page-about .team:nth-child(2) {
    margin-top: 22px;
  }

  .page-about .team:nth-child(3) {
    margin-top: 44px;
  }

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

@media (min-width: 900px) {
  .page-about {
    padding: 26px 24px 72px;
  }

  .page-about .about-hero {
    grid-template-columns: minmax(0, 55fr) minmax(0, 45fr);
    align-items: stretch;
    gap: 34px;
  }

  .page-about .about-hero__visual {
    min-height: 380px;
  }

  .page-about .about-emblem {
    width: 186px;
    height: 186px;
  }

  .page-about .about-emblem__seal {
    font-size: 58px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) 296px;
    align-items: start;
    gap: 26px;
  }

  .page-about .about-split--reverse {
    grid-template-columns: 296px minmax(0, 1fr);
  }

  .page-about .about-split--reverse .about-figure {
    margin-top: 0;
    order: 0;
  }

  .page-about .about-figure--side {
    margin-top: 0;
  }
}

@media (min-width: 960px) {
  .page-about .about-shell {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--bar-h) + 22px);
  }

  .page-about .about-toc__list {
    flex-direction: column;
    overflow: visible;
    gap: 2px;
  }

  .page-about .about-toc__item {
    flex: initial;
  }

  .page-about .about-toc__link {
    display: flex;
    width: 100%;
    padding: 9px 10px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: transparent;
    font-size: 13px;
    white-space: normal;
  }

  .page-about .about-toc__link:hover,
  .page-about .about-toc__link[aria-current] {
    border-left-color: var(--gold-500);
    background: rgba(217, 166, 43, .08);
  }

  .page-about .milestones {
    grid-auto-flow: row;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 0 14px;
    overflow-x: visible;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
  }

  .page-about .team:hover,
  .page-about .about-cta__link:hover {
    transform: none;
  }

  .page-about .milestone:hover .milestone__dot {
    transform: none;
  }
}
<<<END>>>