.page-about {
  --about-rail: 232px;
  background: var(--night);
  color: var(--cream);
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 26px 0 44px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(110% 80% at 4% -20%, rgba(242, 160, 61, 0.22), transparent 55%),
    linear-gradient(168deg, var(--deep) 0%, var(--night) 58%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  left: clamp(6px, 2.5vw, 48px);
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, transparent 0%, var(--orange) 22%, var(--amber) 66%, transparent 100%);
  opacity: 0.85;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  top: -30%;
  width: 48%;
  height: 170%;
  background: linear-gradient(180deg, rgba(242, 160, 61, 0.16), rgba(79, 174, 120, 0.05) 55%, transparent 82%);
  transform: skewX(-15deg);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  padding-left: clamp(16px, 4vw, 56px);
}

.page-about .about-hero__crumb {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin: 0 0 20px;
  font-size: 12.5px;
  color: var(--mist);
}

.page-about .about-hero__crumb a {
  color: var(--mist);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.page-about .about-hero__crumb a:hover,
.page-about .about-hero__crumb a:focus-visible {
  color: var(--orange-bright);
}

.page-about .about-hero__crumb .breadcrumb__sep {
  color: var(--line);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-num);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--amber);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-size: clamp(2.3rem, 8.4vw, 4.4rem);
  line-height: 1.02;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .about-hero__title span {
  display: block;
  color: var(--orange-bright);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.9;
  color: rgba(243, 237, 226, 0.84);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 14px 16px;
  background: rgba(7, 13, 24, 0.86);
}

.page-about .about-hero__num {
  font-family: var(--font-num);
  font-size: clamp(1.25rem, 4vw, 1.65rem);
  line-height: 1;
  color: var(--orange);
  letter-spacing: 0.02em;
}

.page-about .about-hero__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 正文骨架 ---------- */
.page-about .about-body {
  padding: 34px 0 56px;
}

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

.page-about .about-index {
  border-top: 2px solid var(--orange);
  padding-top: 14px;
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--mist);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 8px;
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 7px 10px;
  border-left: 2px solid var(--line);
  color: var(--mist);
  font-size: 13.5px;
  line-height: 1.4;
  text-decoration: none;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .about-index__link .toc__num {
  font-family: var(--font-num);
  font-size: 11.5px;
  color: var(--amber);
  letter-spacing: 0.1em;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--cream);
  border-left-color: var(--orange);
}

.page-about .about-index__link[aria-current="true"] {
  color: var(--orange-bright);
  border-left-color: var(--orange);
  background: rgba(242, 160, 61, 0.08);
}

.page-about .about-flow {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding: 34px 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 16px;
}

.page-about .about-chapter__num {
  margin: 0;
  font-family: var(--font-num);
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4.6vw, 2.35rem);
  line-height: 1.08;
  color: var(--cream);
}

.page-about .about-chapter__lead {
  margin: 0 0 20px;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(243, 237, 226, 0.78);
}

.page-about .about-chapter__text p {
  margin: 0 0 14px;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(243, 237, 226, 0.84);
}

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

.page-about .about-chapter__text--after {
  margin-top: 20px;
}

.page-about .about-chapter__text--after p {
  color: rgba(243, 237, 226, 0.84);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  position: relative;
  margin: 24px 0 0;
  border: 1px solid var(--line);
  background: var(--deep);
}

.page-about .about-figure::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 18px;
  height: 18px;
  border-top: 2px solid var(--orange);
  border-left: 2px solid var(--orange);
  pointer-events: none;
}

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

.page-about .about-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 三条线 ---------- */
.page-about .about-lines {
  display: grid;
  gap: 14px;
  margin-top: 4px;
}

.page-about .about-line {
  position: relative;
  padding: 18px 18px 18px 22px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(15, 26, 46, 0.92), rgba(7, 13, 24, 0.92));
}

.page-about .about-line::before {
  content: "";
  position: absolute;
  left: -1px;
  top: -1px;
  bottom: -1px;
  width: 3px;
  background: linear-gradient(180deg, var(--orange), var(--amber));
}

.page-about .about-line__index {
  margin: 0 0 6px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--turf);
}

.page-about .about-line__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.2rem;
  line-height: 1.2;
  color: var(--cream);
}

.page-about .about-line__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(243, 237, 226, 0.8);
}

/* ---------- 阵容双栏卡 ---------- */
.page-about .about-roster {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 20px;
}

.page-about .about-sheet {
  border: 1px solid var(--line);
  background: rgba(15, 26, 46, 0.7);
}

.page-about .about-sheet__sum {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 14px;
  cursor: pointer;
  list-style: none;
  border-bottom: 1px solid transparent;
}

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

.page-about .about-sheet__sum::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--font-num);
  font-size: 13px;
  color: var(--orange);
  transition: color 0.18s var(--ease);
}

.page-about .about-sheet[open] .about-sheet__sum {
  border-bottom-color: var(--line);
}

.page-about .about-sheet[open] .about-sheet__sum::after {
  content: "－";
}

.page-about .about-sheet__sum:hover::after,
.page-about .about-sheet__sum:focus-visible::after {
  color: var(--orange-bright);
}

.page-about .about-sheet__tag {
  flex: none;
  padding: 2px 7px;
  border: 1px solid var(--amber);
  font-family: var(--font-num);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--orange-bright);
}

.page-about .about-sheet__title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  line-height: 1.3;
  color: var(--cream);
}

.page-about .about-sheet__list {
  list-style: none;
  margin: 0;
  padding: 12px 14px 16px;
  display: grid;
  gap: 10px;
}

.page-about .about-sheet__list li {
  position: relative;
  padding-left: 14px;
  font-size: 13.8px;
  line-height: 1.75;
  color: rgba(243, 237, 226, 0.78);
}

.page-about .about-sheet__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 1px;
  background: var(--amber);
}

.page-about .about-sheet__list strong {
  color: var(--cream);
  font-weight: 600;
  margin-right: 4px;
}

/* ---------- 团队数据 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 22px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stat {
  padding: 16px 14px;
  background: rgba(15, 26, 46, 0.9);
}

.page-about .about-stat__num {
  margin: 0 0 6px;
  font-family: var(--font-num);
  font-size: clamp(1.15rem, 4vw, 1.5rem);
  line-height: 1;
  color: var(--turf);
  letter-spacing: 0.01em;
}

.page-about .about-stat__label {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 22px 0 0;
  padding: 0 0 0 20px;
  border-left: 1px solid var(--line);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 26px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 5px;
  width: 9px;
  height: 9px;
  background: var(--night);
  border: 1.5px solid var(--orange);
}

.page-about .about-timeline__year {
  margin: 0 0 4px;
  font-family: var(--font-num);
  font-size: 1.1rem;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .about-timeline__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1.15rem;
  line-height: 1.25;
  color: var(--cream);
}

.page-about .about-timeline__text {
  margin: 0 0 6px;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(243, 237, 226, 0.8);
}

.page-about .about-timeline__note {
  margin: 0;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--mist);
  opacity: 0.62;
  transition: opacity 0.2s var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__note,
.page-about .about-timeline__item:focus-within .about-timeline__note {
  opacity: 1;
  color: var(--amber);
}

/* ---------- 入口路径 ---------- */
.page-about .about-paths {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-path {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 16px;
  padding: 14px 16px;
  background: rgba(15, 26, 46, 0.88);
  text-decoration: none;
  transition: background 0.18s var(--ease);
}

.page-about .about-path__k {
  font-size: 13.5px;
  color: var(--mist);
}

.page-about .about-path__v {
  font-family: var(--font-display);
  font-size: 0.98rem;
  letter-spacing: 0.02em;
  color: var(--orange);
  transition: color 0.18s var(--ease);
}

.page-about .about-path:hover,
.page-about .about-path:focus-visible {
  background: rgba(242, 160, 61, 0.09);
}

.page-about .about-path:hover .about-path__v,
.page-about .about-path:focus-visible .about-path__v {
  color: var(--orange-bright);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding: 34px 0 56px;
  }

  .page-about .about-hero__lead {
    font-size: 16.5px;
  }

  .page-about .about-hero__facts li {
    padding: 18px 18px 20px;
  }

  .page-about .about-chapter {
    padding: 42px 0;
  }

  .page-about .about-roster {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1px;
    background: var(--line);
    border: 1px solid var(--line);
  }

  .page-about .about-sheet {
    border: 0;
    background: rgba(15, 26, 46, 0.92);
  }

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

  .page-about .about-path {
    padding: 16px 20px;
  }
}

@media (min-width: 900px) {
  .page-about .about-body {
    padding: 48px 0 72px;
  }

  .page-about .about-body__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

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

  .page-about .about-index__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }

  .page-about .about-index__link {
    width: 100%;
  }

  .page-about .about-chapter {
    padding: 52px 0;
  }

  .page-about .about-chapter__head {
    gap: 16px;
    margin-bottom: 20px;
  }

  .page-about .about-line {
    display: grid;
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 8px 28px;
    align-items: start;
    padding: 22px 24px 22px 28px;
  }

  .page-about .about-line__index {
    grid-column: 1;
    margin-bottom: 2px;
  }

  .page-about .about-line__title {
    grid-column: 1;
    margin-bottom: 0;
    font-size: 1.3rem;
  }

  .page-about .about-line__text {
    grid-column: 2;
    grid-row: 1 / span 2;
    font-size: 15px;
  }

  .page-about .about-timeline {
    padding-left: 26px;
  }

  .page-about .about-timeline__item::before {
    left: -31px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__facts li {
    padding: 20px 22px 24px;
  }

  .page-about .about-hero__lead {
    font-size: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-hero__crumb a,
  .page-about .about-timeline__note,
  .page-about .about-path,
  .page-about .about-path__v,
  .page-about .about-sheet__sum::after {
    transition: none;
  }
}
<<<END>>>