.page-about {
  --about-mono: var(--font-mono);
  --about-max: var(--shell);
  background: var(--bone);
  color: var(--peat);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(18px, 3vw, 30px) 0 clamp(52px, 8vw, 96px);
  background:
    radial-gradient(110% 80% at 92% 0%, rgba(63, 169, 245, 0.20), transparent 62%),
    linear-gradient(170deg, var(--night) 0%, var(--peat) 100%);
  color: var(--bone);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(115deg, rgba(243, 239, 230, 0.05) 0 1px, transparent 1px 26px);
  pointer-events: none;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 38px;
  background: var(--bone);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
}
.page-about .about-hero__inner {
  position: relative;
  max-width: var(--about-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.page-about .about-crumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(20px, 4vw, 36px);
  padding: 0;
  list-style: none;
  font-size: 13px;
  letter-spacing: 0.02em;
}
.page-about .about-crumbs__item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: rgba(243, 239, 230, 0.66);
}
.page-about .about-crumbs__item + .about-crumbs__item::before {
  content: "/";
  color: rgba(243, 239, 230, 0.36);
}
.page-about .about-crumbs__link {
  color: var(--ice-pale);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}
.page-about .about-crumbs__link:hover,
.page-about .about-crumbs__link:focus-visible {
  color: var(--bone);
  border-bottom-color: var(--ice);
}
.page-about .about-crumbs__current {
  color: var(--bone);
}

.page-about .about-hero__kicker {
  margin: 0 0 clamp(12px, 2vw, 20px);
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(243, 239, 230, 0.7);
}
.page-about .about-mono {
  font-family: var(--about-mono);
  font-variant-numeric: tabular-nums;
  color: var(--ice);
  letter-spacing: 0.08em;
}

.page-about .about-hero__title {
  margin: 0 0 clamp(16px, 2.6vw, 28px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6.6vw, 72px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--bone);
}

.page-about .about-hero__lead {
  max-width: 62ch;
  margin: 0 0 clamp(28px, 5vw, 48px);
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.8;
  color: rgba(243, 239, 230, 0.86);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: rgba(243, 239, 230, 0.16);
  border-top: 1px solid rgba(243, 239, 230, 0.16);
}
.page-about .about-figure {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 14px 18px;
  background: var(--night);
}
.page-about .about-figure__num {
  font-family: var(--about-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--ice);
}
.page-about .about-figure__label {
  font-size: 13px;
  line-height: 1.5;
  color: rgba(243, 239, 230, 0.7);
}

/* ---------- 主体双栏 ---------- */
.page-about .about-layout {
  max-width: var(--about-max);
  margin: 0 auto;
  padding: clamp(30px, 5vw, 60px) var(--gutter) clamp(48px, 7vw, 96px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-track {
  display: none;
}

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

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding: clamp(26px, 4vw, 44px) 0;
  border-top: 1px solid var(--line);
}
.page-about .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .about-section__head {
  margin-bottom: clamp(14px, 2.4vw, 22px);
}
.page-about .about-section__index {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--about-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--ice-deep);
}
.page-about .about-section__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.22;
  letter-spacing: -0.015em;
  color: var(--peat);
}

.page-about .about-section p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.78;
}
.page-about .about-section > p:last-of-type {
  margin-bottom: 18px;
}

.page-about .about-duo {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .about-note {
  padding: 16px 18px;
  background: var(--bone-deep);
  border-left: 3px solid var(--ice);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}
.page-about .about-note__title {
  margin: 0 0 6px;
  font-family: var(--about-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--peat-soft);
}
.page-about .about-note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--peat-soft);
}

.page-about .about-inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 20px 0 0;
}
.page-about .about-textlink {
  position: relative;
  font-size: 15px;
  font-weight: 700;
  color: var(--ice-deep);
  text-decoration: none;
  border-bottom: 2px solid rgba(63, 169, 245, 0.38);
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}
.page-about .about-textlink::after {
  content: " →";
  font-family: var(--about-mono);
}
.page-about .about-textlink:hover,
.page-about .about-textlink:focus-visible {
  color: var(--peat);
  border-bottom-color: var(--lava);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 20px 0 clamp(24px, 4vw, 36px);
}
.page-about .team-card {
  padding: 20px 20px 22px;
  background: var(--bone-deep);
  border: 1px solid transparent;
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
  transition: transform 200ms var(--ease), background 200ms var(--ease), border-color 200ms var(--ease);
}
.page-about .team-card:hover,
.page-about .team-card:focus-visible {
  transform: translateY(-2px);
  background: var(--bone);
  border-color: var(--ice);
  outline: none;
}
.page-about .team-card:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}
.page-about .team-card--wide {
  background: var(--peat-soft);
  color: var(--bone);
}
.page-about .team-card--wide:hover,
.page-about .team-card--wide:focus-visible {
  background: var(--peat);
}
.page-about .team-card__num {
  margin: 0 0 4px;
  font-family: var(--about-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--ice);
}
.page-about .team-card--wide .team-card__num {
  color: var(--ice-pale);
}
.page-about .team-card__name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.01em;
}
.page-about .team-card__desc {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--peat-soft);
}
.page-about .team-card--wide .team-card__desc {
  color: rgba(243, 239, 230, 0.82);
}
.page-about .team-card__meta {
  margin: 0;
  font-family: var(--about-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--peat-soft);
  opacity: 0.8;
}
.page-about .team-card--wide .team-card__meta {
  color: var(--ice-pale);
  opacity: 0.88;
}

.page-about .about-process {
  padding: 20px 18px 22px;
  background: var(--bone-deep);
  border-top: 3px solid var(--peat);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}
.page-about .about-process__label {
  margin: 0 0 14px;
  font-family: var(--about-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--peat-soft);
  opacity: 0.8;
}
.page-about .process-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .process-step {
  position: relative;
  padding-left: 42px;
}
.page-about .process-step__num {
  position: absolute;
  left: 0;
  top: 2px;
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  font-family: var(--about-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--bone);
  background: var(--peat);
  clip-path: polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
}
.page-about .process-step__name {
  margin: 0 0 4px;
  font-size: 15px;
  font-weight: 700;
  color: var(--peat);
}
.page-about .process-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--peat-soft);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(22px, 4vw, 32px) 0 0;
  padding: 0;
  background: var(--bone-deep);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
  overflow: hidden;
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-figure__cap {
  margin: 0;
  padding: 12px 16px 14px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--peat-soft);
  opacity: 0.82;
}

/* ---------- 数据条 ---------- */
.page-about .about-ledger {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 22px 0 clamp(22px, 4vw, 32px);
  padding: 1px;
  list-style: none;
  background: var(--line);
}
.page-about .ledger-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 16px;
  background: var(--bone);
}
.page-about .ledger-item__num {
  font-family: var(--about-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--peat);
}
.page-about .ledger-item__label {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--peat-soft);
  opacity: 0.82;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 0 0 clamp(6px, 1.5vw, 12px);
  padding: 0 0 0 34px;
  list-style: none;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 10px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--ice-deep), var(--ice) 58%, var(--frost));
}
.page-about .about-timeline__item {
  position: relative;
  margin-bottom: 10px;
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 14px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--bone);
  border: 2px solid var(--ice);
}
.page-about .about-stop {
  background: var(--bone-deep);
  border-left: 2px solid transparent;
  transition: border-color 200ms var(--ease), background 200ms var(--ease);
}
.page-about .about-stop[open] {
  border-left-color: var(--lava);
  background: var(--bone);
}
.page-about .about-stop:hover {
  border-left-color: var(--ice);
}
.page-about .about-stop__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  padding: 12px 16px;
  cursor: pointer;
  list-style: none;
}
.page-about .about-stop__summary::-webkit-details-marker {
  display: none;
}
.page-about .about-stop__summary:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: -2px;
}
.page-about .about-stop__year {
  font-family: var(--about-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ice-deep);
}
.page-about .about-stop__title {
  font-size: 15px;
  font-weight: 700;
  color: var(--peat);
}
.page-about .about-stop__body {
  padding: 0 16px 14px;
}
.page-about .about-stop__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--peat-soft);
}

/* ---------- 视觉章节（深色） ---------- */
.page-about .about-section--dark {
  margin: clamp(20px, 4vw, 36px) calc(var(--gutter) * -1);
  padding: clamp(28px, 5vw, 52px) var(--gutter);
  background:
    radial-gradient(120% 100% at 10% 0%, rgba(63, 169, 245, 0.16), transparent 60%),
    var(--peat);
  color: var(--bone);
  border-top: 0;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}
.page-about .about-section--dark .about-section__index {
  color: var(--ice);
}
.page-about .about-section--dark .about-section__title {
  color: var(--bone);
}
.page-about .about-section--dark p {
  color: rgba(243, 239, 230, 0.85);
}
.page-about .about-swatches {
  padding: 16px 18px 18px;
  background: rgba(243, 239, 230, 0.06);
  border: 1px solid rgba(243, 239, 230, 0.16);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}
.page-about .about-swatches__title {
  margin: 0 0 12px;
  font-family: var(--about-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ice-pale);
}
.page-about .swatch-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .swatch {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: rgba(243, 239, 230, 0.82);
}
.page-about .swatch__chip {
  flex: 0 0 auto;
  width: 26px;
  height: 14px;
  border: 1px solid rgba(243, 239, 230, 0.4);
}
.page-about .swatch__chip--bone { background: var(--bone); }
.page-about .swatch__chip--peat { background: var(--peat); }
.page-about .swatch__chip--ice { background: var(--ice); }
.page-about .swatch__chip--lava { background: var(--lava); }
.page-about .swatch__chip--tool { background: var(--tool); }
.page-about .about-figure--texture {
  background: rgba(243, 239, 230, 0.08);
}
.page-about .about-section--dark .about-figure__cap {
  color: rgba(243, 239, 230, 0.7);
}

/* ---------- 服务 ---------- */
.page-about .about-section--tint {
  margin: clamp(20px, 4vw, 36px) calc(var(--gutter) * -1) 0;
  padding: clamp(26px, 4.5vw, 46px) var(--gutter);
  background: var(--bone-deep);
  border-top: 1px solid var(--line);
}
.page-about .service-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 18px 0 0;
}
.page-about .service-card {
  padding: 18px 18px 20px;
  background: var(--bone);
  border-top: 2px solid var(--ice);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}
.page-about .service-card__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--peat);
}
.page-about .service-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--peat-soft);
}

/* ---------- 收尾 ---------- */
.page-about .about-section--commit {
  margin-top: clamp(20px, 4vw, 36px);
  padding-top: clamp(28px, 4.5vw, 46px);
  border-top: 2px solid var(--peat);
}
.page-about .path-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: 22px;
}
.page-about .path-card {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 16px 18px;
  background: var(--peat);
  color: var(--bone);
  text-decoration: none;
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
  transition: background 200ms var(--ease), transform 200ms var(--ease);
}
.page-about .path-card:hover,
.page-about .path-card:focus-visible {
  background: var(--night);
  transform: translateY(-2px);
  outline: none;
}
.page-about .path-card:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}
.page-about .path-card__step {
  font-family: var(--about-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ice);
}
.page-about .path-card__name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
}
.page-about .path-card__desc {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(243, 239, 230, 0.72);
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 720px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-figure {
    padding: 18px 16px 20px;
  }
  .page-about .team-grid {
    grid-template-columns: 1.2fr 1fr 0.86fr;
    align-items: start;
  }
  .page-about .team-card--slim {
    margin-top: 18px;
  }
  .page-about .process-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
  .page-about .about-ledger {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
  .page-about .service-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .path-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 60px);
    align-items: start;
  }
  .page-about .about-track {
    display: block;
    position: sticky;
    top: 96px;
    align-self: start;
  }
  .page-about .about-track__label {
    margin: 0 0 12px;
    font-family: var(--about-mono);
    font-size: 11px;
    letter-spacing: 0.18em;
    color: var(--peat-soft);
    opacity: 0.7;
  }
  .page-about .about-track__list {
    position: relative;
    margin: 0;
    padding: 0 0 0 14px;
    list-style: none;
    border-left: 1px solid var(--line-strong);
  }
  .page-about .about-track__item {
    margin-bottom: 12px;
  }
  .page-about .about-track__link {
    position: relative;
    display: block;
    font-size: 13px;
    line-height: 1.5;
    color: var(--peat-soft);
    text-decoration: none;
    transition: color 180ms var(--ease);
  }
  .page-about .about-track__link::before {
    content: "";
    position: absolute;
    left: -17px;
    top: 7px;
    width: 7px;
    height: 7px;
    background: var(--frost);
    transition: background 180ms var(--ease), transform 180ms var(--ease);
  }
  .page-about .about-track__link:hover,
  .page-about .about-track__link:focus-visible {
    color: var(--peat);
    outline: none;
  }
  .page-about .about-track__link:focus-visible {
    outline: 2px solid var(--focus);
    outline-offset: 3px;
  }
  .page-about .about-track__link.is-active,
  .page-about .about-track__link[aria-current="true"] {
    color: var(--ice-deep);
    font-weight: 700;
  }
  .page-about .about-track__link.is-active::before,
  .page-about .about-track__link[aria-current="true"]::before {
    background: var(--lava);
    transform: scale(1.4);
  }

  .page-about .about-duo {
    grid-template-columns: minmax(0, 1fr) 246px;
    gap: 30px;
    align-items: start;
  }
  .page-about .about-section--dark .about-duo {
    grid-template-columns: minmax(0, 1fr) 220px;
  }
  .page-about .about-note {
    margin-top: 4px;
  }
  .page-about .about-process {
    padding: 24px 24px 26px;
  }
}