.page-about {
  --about-rail: 84px;
  --about-paper-line: rgba(27, 27, 27, .16);
  --about-paper-text: #333B31;
  --about-hero-tint: rgba(139, 195, 74, .11);
  padding-bottom: clamp(44px, 7vw, 100px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 4vw, 54px) 0 clamp(36px, 6vw, 84px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(52vw, 680px);
  height: 100%;
  background: linear-gradient(158deg, var(--about-hero-tint), transparent 64%);
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4.6vw, 56px);
}

@media (min-width: 940px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(272px, .8fr);
    align-items: end;
  }
}

.page-about .about-hero__title {
  margin: clamp(10px, 1.8vw, 18px) 0 0;
  font-size: clamp(38px, 7.4vw, 94px);
  line-height: 1.02;
  letter-spacing: -0.025em;
  font-weight: 900;
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--fruit);
  position: relative;
}

.page-about .about-hero__title em::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: .07em;
  height: .1em;
  background: var(--lime);
  opacity: .55;
}

.page-about .about-hero__lede {
  margin-top: clamp(18px, 2.6vw, 30px);
  max-width: 56ch;
  color: var(--text);
  font-size: clamp(15px, 1.15vw, 18px);
  line-height: 1.78;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-figures {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--hairline);
}

.page-about .about-figures__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 14px;
  padding: clamp(12px, 1.6vw, 18px) 0;
  border-bottom: var(--hairline);
}

.page-about .about-figures__label {
  color: var(--muted);
  font-size: 13px;
  letter-spacing: .04em;
  line-height: 1.5;
}

.page-about .about-figures__num {
  color: var(--lime);
  font-size: clamp(24px, 3.2vw, 38px);
  line-height: 1;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

/* ---------- 主体框架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 52px);
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
  }
}

/* ---------- 左侧章节索引 ---------- */
.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 16px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__link {
  position: relative;
  display: block;
  padding-left: 13px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: .12em;
  text-decoration: none;
  white-space: nowrap;
  transition: color .25s var(--ease);
}

.page-about .about-rail__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  transform: translateY(-50%) rotate(45deg);
  background: var(--grid);
  transition: background .25s var(--ease), transform .25s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--fruit);
  outline: none;
}

.page-about .about-rail__link:hover::before,
.page-about .about-rail__link:focus-visible::before {
  background: var(--fruit);
  transform: translateY(-50%) rotate(45deg) scale(1.25);
}

@media (min-width: 1000px) {
  .page-about .about-rail {
    position: sticky;
    top: 132px;
    align-self: start;
  }

  .page-about .about-rail__list {
    display: grid;
    gap: 20px;
    overflow: visible;
    padding: 0 0 0 16px;
    border-left: 1px solid var(--grid);
  }

  .page-about .about-rail__link {
    padding-left: 14px;
    white-space: normal;
  }

  .page-about .about-rail__link::before {
    left: -20px;
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding-top: clamp(26px, 3.8vw, 48px);
  border-top: var(--hairline);
}

.page-about .about-sec + .about-sec {
  margin-top: clamp(38px, 6vw, 82px);
}

.page-about .about-sec--slice {
  border-top: none;
  padding-top: 0;
}

.page-about .about-sec--slice::before {
  content: "";
  display: block;
  height: 4px;
  margin-bottom: clamp(26px, 4vw, 52px);
  background: linear-gradient(90deg, var(--fruit), var(--lime) 52%, var(--orange));
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 45%);
}

.page-about .about-sec__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: clamp(12px, 2vw, 26px);
  align-items: baseline;
}

.page-about .about-sec__num {
  color: var(--fruit);
  font-size: clamp(13px, 1.4vw, 16px);
  letter-spacing: .14em;
}

.page-about .about-sec__title {
  margin: 0;
  font-size: clamp(25px, 4.2vw, 50px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-weight: 900;
}

.page-about .about-sec__note {
  grid-column: 2;
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
}

.page-about .about-sec__lead {
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  max-width: 62ch;
  color: var(--text);
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.78;
}

.page-about .about-sec__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3.4vw, 42px);
  margin-top: clamp(20px, 3vw, 34px);
}

@media (min-width: 860px) {
  .page-about .about-sec__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    align-items: start;
  }
}

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

.page-about .about-sec__text p {
  margin: 0 0 1.05em;
  max-width: 62ch;
  color: var(--text);
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.78;
}

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

.page-about .about-sec__text strong {
  color: var(--lime);
  font-weight: 700;
}

/* ---------- 图片 ---------- */
.page-about .about-sec__media {
  margin: 0;
  min-width: 0;
}

.page-about .about-sec__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-sec__media--wide {
  margin-top: clamp(24px, 3.6vw, 44px);
}

.page-about .about-sec__media--wide img {
  aspect-ratio: 3 / 2;
}

/* ---------- 历程时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(22px, 3.4vw, 38px) 0 0;
  padding: 0 0 16px;
  display: flex;
  gap: clamp(16px, 2.4vw, 30px);
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-timeline::-webkit-scrollbar {
  height: 4px;
}

.page-about .about-timeline::-webkit-scrollbar-thumb {
  background: var(--grid);
}

.page-about .about-timeline__item {
  position: relative;
  flex: 0 0 clamp(214px, 60vw, 262px);
  padding: 30px 0 0;
  scroll-snap-align: start;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: 6px;
  left: 0;
  right: calc(-1 * clamp(16px, 2.4vw, 30px));
  height: 1px;
  background: var(--grid);
}

.page-about .about-timeline__item:last-child::before {
  right: 40%;
}

.page-about .about-timeline__dot {
  position: absolute;
  top: 0;
  left: 0;
  width: 13px;
  height: 13px;
  transform: rotate(45deg);
  background: var(--fruit);
  transition: transform .3s var(--ease), background .3s var(--ease);
}

.page-about .about-timeline__dot--alt {
  background: var(--orange);
}

.page-about .about-timeline__item:hover .about-timeline__dot {
  transform: rotate(45deg) scale(1.3);
  background: var(--lime);
}

.page-about .about-timeline__ver {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: .16em;
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-size: clamp(17px, 1.5vw, 21px);
  font-weight: 700;
  line-height: 1.3;
  transition: color .25s var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__title {
  color: var(--lime);
}

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

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(22px, 3.4vw, 38px);
  background: var(--grid);
  border: var(--hairline);
}

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

.page-about .about-team__col {
  background: var(--ink);
  padding: clamp(20px, 2.6vw, 32px);
}

.page-about .about-team__tag {
  display: inline-block;
  margin: 0 0 14px;
  padding: 5px 10px;
  background: rgba(139, 195, 74, .14);
  color: var(--fruit);
  font-size: 11px;
  letter-spacing: .14em;
}

.page-about .about-team__title {
  margin: 0 0 14px;
  font-size: clamp(17px, 1.4vw, 20px);
  font-weight: 700;
  line-height: 1.35;
}

.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-team__list li {
  position: relative;
  padding: 9px 0 9px 16px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
  border-top: 1px solid var(--grid);
}

.page-about .about-team__list li:first-child {
  border-top: none;
  padding-top: 0;
}

.page-about .about-team__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 5px;
  height: 5px;
  transform: rotate(45deg);
  background: var(--fruit);
}

.page-about .about-team__list li:first-child::before {
  top: 9px;
}

/* ---------- 覆盖数据条 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: clamp(24px, 3.6vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--grid);
  border: var(--hairline);
}

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-stats__item {
  background: var(--ink-deep);
  padding: clamp(16px, 2.2vw, 26px);
  display: grid;
  gap: 8px;
}

.page-about .about-stats__num {
  color: var(--lime);
  font-size: clamp(28px, 3.6vw, 44px);
  line-height: 1;
  letter-spacing: -0.02em;
}

.page-about .about-stats__label {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

/* ---------- 方法论纸面 ---------- */
.page-about .about-paper {
  margin-top: clamp(22px, 3.4vw, 40px);
  padding: clamp(22px, 3.8vw, 52px);
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-paper .about-paper__eyebrow {
  color: #5E6B58;
}

.page-about .about-paper__title {
  margin: 12px 0 0;
  font-size: clamp(20px, 2.4vw, 30px);
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-fields {
  list-style: none;
  margin: clamp(18px, 2.6vw, 30px) 0 0;
  padding: 0;
}

.page-about .about-fields__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: clamp(13px, 1.6vw, 18px) 0;
  border-bottom: 1px solid var(--about-paper-line);
}

.page-about .about-fields__item:first-child {
  border-top: 1px solid var(--about-paper-line);
}

@media (min-width: 700px) {
  .page-about .about-fields__item {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

.page-about .about-fields__name {
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
}

.page-about .about-fields__desc {
  margin: 0;
  color: var(--about-paper-text);
  font-size: 15px;
  line-height: 1.72;
}

.page-about .about-paper__foot {
  margin: clamp(20px, 2.8vw, 30px) 0 0;
  max-width: 64ch;
  color: var(--about-paper-text);
  font-size: 15px;
  line-height: 1.75;
}

/* ---------- 后续计划 ---------- */
.page-about .about-next {
  list-style: none;
  margin: clamp(22px, 3.4vw, 38px) 0 0;
  padding: 0;
}

.page-about .about-next__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 2.2vw, 28px);
  padding: clamp(16px, 2.2vw, 26px) 0;
  border-top: var(--hairline);
}

.page-about .about-next__item:last-child {
  border-bottom: var(--hairline);
}

.page-about .about-next__idx {
  display: block;
  min-width: 30px;
  color: var(--orange);
  font-size: 13px;
  letter-spacing: .1em;
  padding-top: 5px;
}

.page-about .about-next__title {
  margin: 0 0 8px;
  font-size: clamp(17px, 1.5vw, 21px);
  font-weight: 700;
  line-height: 1.35;
}

.page-about .about-next__body p {
  margin: 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.75;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(26px, 4vw, 48px);
  padding: clamp(22px, 3.2vw, 40px);
  background: var(--ink-deep);
  border-left: 3px solid var(--fruit);
  display: grid;
  gap: 18px;
}

@media (min-width: 760px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 28px;
  }
}

.page-about .about-cta__text {
  margin: 0;
  color: var(--text);
  font-size: clamp(15px, 1.1vw, 17px);
  line-height: 1.7;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-rhythm {
  margin: clamp(30px, 4.4vw, 58px) 0 0;
  padding-top: clamp(18px, 2.4vw, 28px);
  border-top: var(--hairline);
  max-width: 58ch;
  color: var(--muted);
  font-size: clamp(14px, 1vw, 16px);
  line-height: 1.8;
}