.page-about {
  --about-rail-w: 208px;
  --about-card-shadow: 6px 6px 0 var(--shadow);
  --about-card-shadow-hover: 10px 10px 0 var(--shadow);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .about-crumbs {
  padding-top: clamp(18px, 3vw, 30px);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  margin-top: clamp(16px, 3vw, 28px);
}

.page-about .about-hero__panel {
  position: relative;
  padding: clamp(22px, 4vw, 52px);
  background:
    radial-gradient(115% 88% at 86% 6%, rgba(43, 224, 138, 0.16), transparent 58%),
    radial-gradient(90% 72% at 8% 98%, rgba(55, 230, 255, 0.12), transparent 62%),
    linear-gradient(158deg, var(--panel) 0%, var(--ink) 82%);
}

.page-about .about-hero .label-chip {
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 3.4vw, 40px);
  min-width: 0;
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(30px, 5.6vw, 64px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 40ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.75;
  color: var(--paper);
}

.page-about .about-hero__note {
  margin: 14px 0 0;
  max-width: 42ch;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  border: 2px solid var(--line);
  background: var(--line);
  align-self: start;
}

.page-about .about-fact {
  background: rgba(11, 18, 32, 0.72);
  padding: 14px 16px 16px;
  min-width: 0;
}

.page-about .about-fact__value {
  display: block;
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 700;
  color: var(--green);
  letter-spacing: -0.01em;
}

.page-about .about-fact__unit {
  font-size: 0.62em;
  margin-left: 2px;
  color: var(--cyan);
}

.page-about .about-fact__label {
  margin: 6px 0 0;
  font-size: 12px;
  line-height: 1.5;
  color: var(--mist);
}

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }
}

/* ============ 主体骨架：左索引 + 右走廊 ============ */
.page-about .about-body {
  margin-top: clamp(28px, 5vw, 56px);
  display: grid;
  gap: clamp(22px, 3vw, 36px);
  min-width: 0;
}

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

.page-about .about-index__label {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--mist);
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__link {
  display: block;
  white-space: nowrap;
  padding: 8px 12px;
  border: 2px solid var(--line);
  background: var(--panel);
  color: var(--paper);
  font-size: 13px;
  text-decoration: none;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-color: var(--green);
  color: var(--green);
  transform: translateY(-2px);
}

.page-about .about-index__link[aria-current="true"],
.page-about .about-index__link[data-active] {
  border-color: var(--green);
  color: var(--ink);
  background: var(--green);
}

.page-about .about-flow {
  min-width: 0;
  display: grid;
  gap: clamp(34px, 6vw, 72px);
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-index {
    position: sticky;
    top: 96px;
  }
  .page-about .about-index__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
    gap: 6px;
  }
  .page-about .about-index__link {
    white-space: normal;
    border-width: 0 0 0 2px;
    border-radius: 0;
    background: transparent;
    color: var(--mist);
    padding: 6px 0 6px 12px;
  }
  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    transform: none;
    background: transparent;
    color: var(--paper);
  }
  .page-about .about-index__link[aria-current="true"],
  .page-about .about-index__link[data-active] {
    background: transparent;
    border-color: var(--green);
    color: var(--green);
  }
}

/* ============ 章节标题 ============ */
.page-about .about-sec {
  min-width: 0;
}

.page-about .sec-head {
  display: grid;
  gap: clamp(10px, 2vw, 22px);
  margin-bottom: clamp(16px, 2.6vw, 26px);
}

.page-about .sec-head__index {
  margin: 0;
  font-size: clamp(40px, 7vw, 72px);
  font-weight: 300;
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: rgba(43, 224, 138, 0.5);
}

.page-about .sec-head__text {
  min-width: 0;
}

.page-about .sec-head__title {
  margin: 0 0 8px;
  font-size: clamp(23px, 3.2vw, 36px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .sec-head__lede {
  margin: 0;
  max-width: 48ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--mist);
}

@media (min-width: 760px) {
  .page-about .sec-head {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: start;
  }
}

/* ============ 图文分栏 ============ */
.page-about .about-split {
  display: grid;
  gap: clamp(18px, 2.6vw, 30px);
  min-width: 0;
}

.page-about .about-split__text p {
  margin: 0 0 14px;
  max-width: 42ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--paper);
}

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

.page-about .about-figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-figure__frame {
  border: 2px solid var(--line);
  box-shadow: var(--about-card-shadow);
  background: var(--panel);
  aspect-ratio: 3 / 2;
  overflow: hidden;
}

.page-about .about-figure__frame--tall {
  aspect-ratio: 14 / 9;
}

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

.page-about .about-figure__cap {
  margin: 12px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
  .page-about .about-split--reverse .about-split__text {
    order: 2;
  }
  .page-about .about-split--reverse .about-figure {
    order: 1;
  }
}

/* ============ 时间走廊 ============ */
.page-about .timeline {
  position: relative;
  display: grid;
  gap: clamp(12px, 1.8vw, 18px);
  padding-left: clamp(14px, 2.4vw, 26px);
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--green), var(--cyan) 60%, var(--line));
}

.page-about .stage {
  position: relative;
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: var(--about-card-shadow);
  transition: box-shadow 0.18s var(--ease), transform 0.18s var(--ease);
}

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

.page-about .stage__head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px clamp(14px, 2vw, 22px);
  cursor: pointer;
  list-style: none;
}

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

.page-about .stage__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--mono);
  font-size: 20px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .stage[open] .stage__head::after {
  content: "\2212";
  color: var(--green);
}

.page-about .stage__dot {
  flex: none;
  width: 12px;
  height: 12px;
  margin-left: -21px;
  border: 2px solid var(--green);
  border-radius: 50%;
  background: var(--ink);
}

.page-about .stage[open] .stage__dot {
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(43, 224, 138, 0.18);
}

.page-about .stage__year {
  flex: none;
  font-size: 14px;
  font-weight: 700;
  color: var(--orange);
}

.page-about .stage__name {
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

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

.page-about .stage__body {
  padding: 0 clamp(14px, 2vw, 22px) clamp(16px, 2vw, 22px);
  border-top: 1px solid var(--line);
}

.page-about .stage__body p {
  margin: 14px 0 0;
  max-width: 56ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ============ 团队三卡 ============ */
.page-about .team-grid {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
  min-width: 0;
}

.page-about .team-card {
  border: 2px solid var(--line);
  background: linear-gradient(170deg, var(--panel), rgba(11, 18, 32, 0.9));
  box-shadow: var(--about-card-shadow);
  padding: 18px 18px 20px;
  transition: transform 0.18s var(--ease), box-shadow 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  transform: translateY(-2px);
  box-shadow: var(--about-card-shadow-hover);
  border-color: var(--green);
}

.page-about .team-card__index {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .team-card__name {
  margin: 8px 0 0;
  font-size: 19px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .team-card__count {
  margin: 10px 0 0;
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--green);
}

.page-about .team-card__count span {
  font-size: 13px;
  margin-left: 3px;
  color: var(--mist);
}

.page-about .team-card__duty {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .team-card__keywords {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 12.5px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--orange);
  transition: max-height 0.18s var(--ease), opacity 0.18s var(--ease), margin-top 0.18s var(--ease);
}

@media (hover: hover) and (pointer: fine) {
  .page-about .team-card:hover .team-card__keywords,
  .page-about .team-card:focus-within .team-card__keywords {
    max-height: 6em;
    opacity: 1;
    margin-top: 12px;
  }
}

@media (hover: none), (pointer: coarse) {
  .page-about .team-card__keywords {
    max-height: none;
    opacity: 1;
    margin-top: 12px;
  }
}

@media (min-width: 780px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ============ 流转顺序 ============ */
.page-about .handoff {
  display: grid;
  gap: 8px;
  margin: clamp(20px, 3vw, 28px) 0 clamp(24px, 4vw, 36px);
  padding: 0;
  list-style: none;
}

.page-about .handoff__step {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 2px solid var(--line);
  background: rgba(20, 30, 51, 0.6);
}

.page-about .handoff__num {
  flex: none;
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  font-size: 12px;
  color: var(--ink);
  background: var(--green);
}

.page-about .handoff__text {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--paper);
}

@media (min-width: 900px) {
  .page-about .handoff {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0;
  }
  .page-about .handoff__step {
    border-right-width: 0;
    min-height: 84px;
    align-items: flex-start;
  }
  .page-about .handoff__step:last-child {
    border-right-width: 2px;
  }
}

/* ============ 更新节奏 ============ */
.page-about .rhythm {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 2px solid var(--line);
}

.page-about .rhythm__row {
  display: grid;
  gap: 8px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  transition: background 0.18s var(--ease);
}

.page-about .rhythm__row:hover {
  background: rgba(43, 224, 138, 0.05);
}

.page-about .rhythm__time {
  font-size: 13px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .rhythm__track {
  display: block;
  height: 12px;
  border: 2px solid var(--line);
  background: rgba(11, 18, 32, 0.8);
}

.page-about .rhythm__bar {
  display: block;
  height: 100%;
  width: 50%;
  background: linear-gradient(90deg, var(--green), var(--cyan));
  transition: width 0.3s var(--ease);
}

.page-about .rhythm__row:hover .rhythm__bar {
  background: linear-gradient(90deg, var(--orange), var(--green));
}

.page-about .rhythm__row:nth-child(1) .rhythm__bar { width: 100%; }
.page-about .rhythm__row:nth-child(2) .rhythm__bar { width: 84%; }
.page-about .rhythm__row:nth-child(3) .rhythm__bar { width: 66%; }
.page-about .rhythm__row:nth-child(4) .rhythm__bar { width: 48%; }
.page-about .rhythm__row:nth-child(5) .rhythm__bar { width: 32%; }

.page-about .rhythm__note {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--mist);
  transition: max-height 0.18s var(--ease), opacity 0.18s var(--ease);
}

@media (hover: hover) and (pointer: fine) {
  .page-about .rhythm__row:hover .rhythm__note {
    max-height: 5em;
    opacity: 1;
  }
}

@media (hover: none), (pointer: coarse) {
  .page-about .rhythm__note {
    max-height: none;
    opacity: 1;
  }
}

@media (min-width: 720px) {
  .page-about .rhythm__row {
    grid-template-columns: minmax(120px, 150px) minmax(0, 1fr) minmax(0, 1.1fr);
    align-items: center;
    gap: 16px;
  }
}

/* ============ 五步入口 ============ */
.page-about .about-lead-text {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--paper);
}

.page-about .about-path {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .path__item {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: var(--about-card-shadow);
  transition: transform 0.18s var(--ease), box-shadow 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .path__item:hover {
  transform: translateY(-2px);
  box-shadow: var(--about-card-shadow-hover);
  border-color: var(--green);
}

.page-about .path__num {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--ink);
  background: var(--green);
  justify-self: start;
  padding: 2px 7px;
}

.page-about .path__name {
  font-size: 17px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .path__desc {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--mist);
}

@media (min-width: 920px) {
  .page-about .about-path {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 12px;
  }
}

.page-about .entry-result {
  margin-top: clamp(18px, 2.6vw, 26px);
  padding: clamp(18px, 2.4vw, 26px);
  border-left: 6px solid var(--orange);
  background: linear-gradient(120deg, rgba(255, 122, 47, 0.1), rgba(20, 30, 51, 0.9));
}

.page-about .entry-result__label {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .entry-result__text {
  margin: 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--paper);
}

/* ============ 后续方向 ============ */
.page-about .next-list {
  display: grid;
  gap: clamp(12px, 1.8vw, 18px);
  margin: 0 0 clamp(28px, 4vw, 44px);
  padding: 0;
  list-style: none;
}

.page-about .next-list__item {
  padding: 16px 18px;
  border: 2px solid var(--line);
  border-left: 4px solid var(--cyan);
  background: rgba(20, 30, 51, 0.65);
}

.page-about .next-list__name {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .next-list__item p {
  margin: 0;
  max-width: 54ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

@media (min-width: 780px) {
  .page-about .next-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ============ 收口 ============ */
.page-about .about-cta {
  position: relative;
  padding: clamp(22px, 3.4vw, 40px);
  background:
    radial-gradient(110% 100% at 92% 0%, rgba(43, 224, 138, 0.14), transparent 58%),
    linear-gradient(150deg, var(--panel), var(--ink));
}

.page-about .about-cta .label-chip {
  margin-bottom: 14px;
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-size: clamp(22px, 2.8vw, 32px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (max-width: 420px) {
  .page-about .about-hero__facts {
    grid-template-columns: minmax(0, 1fr);
  }
  .page-about .about-cta__actions .btn {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stage,
  .page-about .team-card,
  .page-about .path__item,
  .page-about .about-index__link,
  .page-about .rhythm__bar,
  .page-about .team-card__keywords,
  .page-about .rhythm__note {
    transition: none;
  }
  .page-about .stage:hover,
  .page-about .team-card:hover,
  .page-about .path__item:hover,
  .page-about .about-index__link:hover {
    transform: none;
  }
}
<<<END>>>