.page-about {
  --about-hair: 1px solid var(--line);
  --about-strong: 2px solid var(--line-strong);
  --about-pad: clamp(1.1rem, 2.4vw, 1.8rem);
  --about-body-text: rgba(243, 235, 221, 0.86);
  --about-muted: rgba(143, 166, 184, 0.92);
}

.page-about .about-crumbs {
  padding-top: clamp(1rem, 2.6vw, 1.6rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-bottom: clamp(0.8rem, 2vw, 1.4rem);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.3rem, 3vw, 2.2rem);
  padding-block: clamp(1.4rem, 3.6vw, 2.8rem) clamp(1.6rem, 3.4vw, 2.4rem);
  border-bottom: var(--about-strong);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 6.2vw, 4.3rem);
  line-height: 1.06;
  letter-spacing: -0.012em;
  font-weight: 800;
  color: var(--bone);
  margin: 0.5rem 0 1rem;
  text-wrap: balance;
}

.page-about .about-hero__lede {
  font-family: var(--font-editorial);
  font-size: clamp(1rem, 1.5vw, 1.16rem);
  line-height: 1.85;
  color: var(--about-body-text);
  margin: 0;
  max-width: 46ch;
}

.page-about .about-hero__note {
  background: var(--ink-800);
  border: var(--about-strong);
  box-shadow: var(--shadow-soft);
  padding: var(--about-pad);
}

.page-about .about-hero__note-title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--lime);
  margin: 0 0 0.7rem;
}

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

.page-about .about-facts > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding-block: 0.6rem;
  border-top: var(--about-hair);
}

.page-about .about-facts > div:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-facts > div:last-child {
  padding-bottom: 0;
}

.page-about .about-facts dt {
  font-size: 0.82rem;
  color: var(--steel);
  letter-spacing: 0.02em;
  line-height: 1.5;
}

.page-about .about-facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  color: var(--bone);
  white-space: nowrap;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  position: relative;
  margin: 0;
  border: var(--about-strong);
  box-shadow: var(--shadow-hard);
  background: var(--ink-800);
  overflow: hidden;
}

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

.page-about .about-figure--hero {
  margin-top: clamp(1.4rem, 3.4vw, 2.4rem);
}

.page-about .about-figure--hero img {
  aspect-ratio: 16 / 9;
}

.page-about .about-figure--wide {
  margin-top: clamp(1.8rem, 4vw, 3rem);
}

.page-about .about-figure--wide img {
  aspect-ratio: 2 / 1;
}

.page-about .about-figure--team img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 1.8rem 1rem 0.7rem;
  background: linear-gradient(to top, rgba(7, 28, 22, 0.94), rgba(7, 28, 22, 0));
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.05em;
  color: var(--bone);
}

/* ---------- 吸顶目录 ---------- */
.page-about .about-index {
  position: sticky;
  top: 0;
  z-index: 5;
  background: var(--ink-900);
  border-block: 1px solid var(--line-strong);
}

.page-about .about-index__inner {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-block: 0.65rem;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-index__label {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--orange);
  padding-right: 0.75rem;
  border-right: var(--about-hair);
}

.page-about .about-index__list {
  display: flex;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__link {
  display: inline-block;
  padding: 0.32rem 0.68rem;
  font-size: 0.82rem;
  line-height: 1.4;
  color: var(--steel);
  text-decoration: none;
  border: 1px solid transparent;
  white-space: nowrap;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--ink-900);
  background: var(--lime);
  border-color: var(--lime);
  outline: none;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding-block: clamp(2.2rem, 5.5vw, 4.2rem);
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 4.2rem;
}

.page-about .about-section--last {
  border-bottom: 0;
  padding-bottom: clamp(2.6rem, 6vw, 4.8rem);
}

.page-about .about-split {
  display: grid;
  gap: clamp(1rem, 2.6vw, 2rem);
}

.page-about .about-rail__label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--orange);
  margin: 0 0 0.8rem;
}

.page-about .about-rail p:not(.about-rail__label) {
  font-family: var(--font-editorial);
  font-size: 0.98rem;
  line-height: 1.9;
  color: var(--about-muted);
  margin: 0;
  padding-left: 0.9rem;
  border-left: 2px solid var(--ink-700);
}

.page-about .about-h2 {
  font-family: var(--font-editorial);
  font-size: clamp(1.42rem, 2.8vw, 2.15rem);
  line-height: 1.3;
  color: var(--bone);
  margin: 0 0 1rem;
  letter-spacing: 0.005em;
}

.page-about .about-body p {
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--about-body-text);
  margin: 0 0 1rem;
}

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

.page-about .about-body__tail {
  margin-top: 1.2rem !important;
  padding-top: 1rem;
  border-top: var(--about-hair);
}

/* ---------- 内容产线 ---------- */
.page-about .about-outputs {
  list-style: none;
  margin: 1.4rem 0 0;
  padding: 0;
}

.page-about .about-output {
  padding-block: 0.95rem;
  border-top: var(--about-hair);
}

.page-about .about-output__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.4rem 1rem;
  margin-bottom: 0.35rem;
}

.page-about .about-output__title {
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--bone);
  margin: 0;
}

.page-about .about-output__owner {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--ink-900);
  background: var(--steel);
  padding: 0.18rem 0.5rem;
  white-space: nowrap;
}

.page-about .about-output p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.75;
  color: var(--about-body-text);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(1.6rem, 4vw, 2.6rem) 0 0;
  padding: 0 0 0 2.5rem;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0.92rem;
  top: 0.7rem;
  bottom: 0.7rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--ink-700), rgba(18, 60, 47, 0.25));
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: clamp(1.3rem, 3vw, 1.9rem);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -1.98rem;
  top: 0.42rem;
  width: 0.72rem;
  height: 0.72rem;
  background: var(--ink-900);
  border: 2px solid var(--steel);
  transform: rotate(45deg);
}

.page-about .about-timeline__item--key::before {
  background: var(--lime);
  border-color: var(--lime);
  box-shadow: 0 0 0 5px rgba(200, 255, 61, 0.16);
}

.page-about .about-timeline__ver {
  display: inline-block;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--stone);
  background: var(--steel);
  padding: 0.12rem 0.42rem;
  margin-bottom: 0.5rem;
}

.page-about .about-timeline__item--key .about-timeline__ver {
  color: var(--ink-900);
  background: var(--lime);
}

.page-about .about-timeline__phase {
  display: block;
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: var(--orange);
  margin: 0 0 0.28rem;
}

.page-about .about-timeline__title {
  font-family: var(--font-display);
  font-size: clamp(1.08rem, 2vw, 1.32rem);
  font-weight: 700;
  letter-spacing: 0.015em;
  color: var(--bone);
  margin: 0 0 0.4rem;
}

.page-about .about-timeline__content p:not(.about-timeline__phase) {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--about-body-text);
  max-width: 58ch;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(1.2rem, 3vw, 2.2rem);
  margin-bottom: clamp(1.8rem, 4vw, 2.8rem);
}

.page-about .about-team__copy .about-h2 {
  margin-top: 0;
}

.page-about .about-roster {
  display: grid;
  background: var(--ink-800);
  border: var(--about-strong);
  box-shadow: var(--shadow-soft);
}

.page-about .about-role {
  position: relative;
  padding: var(--about-pad);
  border-bottom: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  overflow: hidden;
  transition: background-color 0.25s ease;
}

.page-about .about-role:last-child {
  border-bottom: 0;
}

.page-about .about-role::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  height: 3px;
  width: 0;
  background: var(--lime);
  transition: width 0.32s ease;
}

.page-about .about-role:hover {
  background: var(--ink-700);
}

.page-about .about-role:hover::after {
  width: 100%;
}

.page-about .about-role__code {
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .about-role__name {
  font-family: var(--font-display);
  font-size: 1.16rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--bone);
  margin: 0;
}

.page-about .about-role__count {
  font-size: 1.9rem;
  line-height: 1;
  color: var(--lime);
  margin: 0.15rem 0 0.5rem;
}

.page-about .about-role__desc {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--about-body-text);
}

/* ---------- 服务原则 ---------- */
.page-about .about-principles {
  list-style: none;
  margin: 1.2rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-principles li {
  padding: 1rem 0 1rem 1rem;
  border-left: 2px solid var(--ink-700);
}

.page-about .about-principles__num {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--clay);
  margin-bottom: 0.3rem;
}

.page-about .about-principles h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--bone);
  margin: 0 0 0.35rem;
}

.page-about .about-principles p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--about-body-text);
}

/* ---------- CTA ---------- */
.page-about .about-cta {
  margin-top: clamp(1.8rem, 4vw, 3rem);
  padding: var(--about-pad);
  background: linear-gradient(135deg, var(--ink-700) 0%, var(--ink-800) 62%, var(--ink-900) 100%);
  border: var(--about-strong);
  box-shadow: var(--shadow-hard);
  display: grid;
  gap: 1.2rem;
}

.page-about .about-cta__title {
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 3vw, 1.9rem);
  font-weight: 800;
  line-height: 1.16;
  color: var(--bone);
  margin: 0 0 0.55rem;
}

.page-about .about-cta__text p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--about-body-text);
  max-width: 48ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.7rem;
}

.page-about .about-next {
  list-style: none;
  margin: 1.2rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.page-about .about-next a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 0.9rem;
  font-size: 0.9rem;
  color: var(--bone);
  text-decoration: none;
  background: var(--ink-800);
  border: 1px solid var(--line);
  transition: border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.page-about .about-next a:hover,
.page-about .about-next a:focus-visible {
  border-color: var(--lime);
  color: var(--lime);
  outline: none;
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-roster {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-role {
    border-bottom: 0;
    border-right: 1px solid var(--line);
  }

  .page-about .about-role:last-child {
    border-right: 0;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 1.6rem;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }

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

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
    column-gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 3fr) minmax(0, 8fr);
    column-gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .about-rail {
    padding-top: 0.45rem;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: center;
    column-gap: clamp(2rem, 5vw, 3.6rem);
  }

  .page-about .about-timeline {
    padding-left: 3rem;
  }

  .page-about .about-timeline::before {
    left: 1.02rem;
  }

  .page-about .about-timeline__item::before {
    left: -2.42rem;
  }

  .page-about .about-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.4rem;
    align-items: start;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-role,
  .page-about .about-role::after,
  .page-about .about-next a {
    transition: none;
  }
}