.page-about {
  --about-rail: 9.5rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  background: var(--ink);
  color: var(--paper);
  padding-block: clamp(1.75rem, 4vw, 3rem) clamp(2.75rem, 7vw, 5rem);
  border-bottom: 1px solid rgba(251, 248, 242, 0.14);
}

.page-about .about-crumb ol,
.page-about .about-crumb li {
  color: rgba(251, 248, 242, 0.55);
}

.page-about .about-crumb a {
  color: rgba(251, 248, 242, 0.72);
  text-decoration: none;
}

.page-about .about-crumb a:hover {
  color: var(--paper);
}

.page-about .about-crumb [aria-current="page"] {
  color: var(--paper);
}

.page-about .about-hero .eyebrow {
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
  color: var(--amber);
}

.page-about .about-hero .display-1 {
  color: var(--paper);
  max-width: 20ch;
  margin-top: 0.65rem;
}

.page-about .about-hero__lede {
  margin-top: 1.25rem;
  max-width: 40rem;
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  line-height: 1.8;
  color: rgba(251, 248, 242, 0.78);
}

.page-about .about-hero__metrics {
  list-style: none;
  margin: clamp(2rem, 4vw, 3rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(251, 248, 242, 0.16);
  border: 1px solid rgba(251, 248, 242, 0.16);
}

.page-about .about-hero__metrics li {
  background: var(--ink);
  padding: 1rem 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.page-about .about-hero__metrics .mono {
  font-size: clamp(1.45rem, 3vw, 1.95rem);
  color: var(--paper);
  letter-spacing: 0.04em;
}

.page-about .about-hero__mlabel {
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: rgba(251, 248, 242, 0.6);
}

@media (min-width: 720px) {
  .page-about .about-hero__metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  padding-block: clamp(3rem, 8vw, 6.5rem);
}

.page-about .origin-grid {
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
}

.page-about .origin-text .section-title {
  margin-top: 0.75rem;
}

.page-about .origin-text .prose {
  margin-top: 1.25rem;
}

.page-about .origin-text .prose p {
  margin-bottom: 1rem;
}

.page-about .origin-text .prose p:last-child {
  margin-bottom: 0;
}

.page-about .origin-figure {
  margin: 0;
}

@media (min-width: 940px) {
  .page-about .origin-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: end;
  }
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  padding-block: clamp(3rem, 8vw, 6rem);
}

.page-about .tl-head {
  max-width: 44rem;
  margin-bottom: clamp(2rem, 4vw, 3rem);
}

.page-about .tl-head .section-title {
  margin-top: 0.6rem;
}

.page-about .atl-grid {
  display: grid;
  gap: 1.75rem;
}

.page-about .atl-rail ul {
  list-style: none;
  margin: 0.9rem 0 0;
  padding: 0;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.page-about .atl-rail a {
  display: flex;
  flex-direction: column;
  gap: 0.12rem;
  padding: 0.55rem 0.9rem;
  border: var(--hair);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--slate);
  background: rgba(251, 248, 242, 0.5);
  transition: border-color 0.14s var(--ease), background 0.14s var(--ease);
}

.page-about .atl-rail a:hover,
.page-about .atl-rail a:focus-visible {
  border-color: var(--amber);
  background: var(--paper);
}

.page-about .atl-rail a > .mono {
  font-size: 1rem;
  color: var(--ink);
  letter-spacing: 0.04em;
}

.page-about .atl-rail__lab {
  font-size: 0.75rem;
  letter-spacing: 0.06em;
}

.page-about .atl-item {
  position: relative;
  padding: 0 0 2.25rem 1.5rem;
  border-left: 1px solid rgba(20, 52, 43, 0.18);
}

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

.page-about .atl-item::before {
  content: "";
  position: absolute;
  left: -4.5px;
  top: 0.5rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ink-2);
  box-shadow: 0 0 0 3px var(--sand);
}

.page-about .atl-item:last-child::before {
  background: var(--amber);
}

.page-about .atl-item__year {
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  color: var(--amber-deep);
}

.page-about .atl-item h3 {
  margin: 0.4rem 0 0;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .atl-item p:last-child {
  margin: 0.55rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--slate);
}

@media (min-width: 900px) {
  .page-about .atl-grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 3.5rem;
  }

  .page-about .atl-rail {
    position: sticky;
    top: 5.5rem;
    align-self: start;
  }

  .page-about .atl-rail ul {
    flex-direction: column;
    gap: 0;
  }

  .page-about .atl-rail li {
    border-left: 1px solid rgba(20, 52, 43, 0.18);
  }

  .page-about .atl-rail a {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    margin-left: -1px;
    background: transparent;
    padding: 0.6rem 0 0.6rem 1rem;
  }

  .page-about .atl-rail a:hover,
  .page-about .atl-rail a:focus-visible {
    border-left-color: var(--amber);
    background: transparent;
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding-block: clamp(3rem, 8vw, 6rem);
}

.page-about .team-intro {
  max-width: 44rem;
}

.page-about .team-intro .section-title {
  margin-top: 0.6rem;
}

.page-about .team-intro > p:last-child {
  margin-top: 1rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .team-bars {
  list-style: none;
  margin: clamp(2rem, 4vw, 3rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1.6rem;
}

.page-about .team-bar {
  border-top: var(--hair);
  padding-top: 1rem;
}

.page-about .team-bar__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.page-about .team-bar__role {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .team-bar__num {
  font-size: 1.5rem;
  color: var(--ink-2);
  letter-spacing: 0.04em;
}

.page-about .team-bar__track {
  margin-top: 0.7rem;
  height: 8px;
  background: rgba(20, 52, 43, 0.08);
  border-radius: 1px;
  overflow: hidden;
}

.page-about .team-bar__fill {
  display: block;
  height: 100%;
  background: var(--ink-2);
}

.page-about .team-bar__fill--buyer {
  width: 20.6%;
}

.page-about .team-bar__fill--qc {
  width: 13.2%;
}

.page-about .team-bar__fill--cs {
  width: 17.6%;
}

.page-about .team-bar__fill--log {
  width: 26.5%;
}

.page-about .team-bar__desc {
  margin: 0.7rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--slate);
}

.page-about .team-note {
  margin-top: 1.75rem;
  padding-top: 0.9rem;
  border-top: var(--hair-soft);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--slate);
}

@media (min-width: 900px) {
  .page-about .team-bars {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 3.5rem;
    row-gap: 2rem;
  }
}

/* ---------- 流程 ---------- */
.page-about .about-flow {
  padding-block: clamp(3rem, 8vw, 6rem);
}

.page-about .flow-head {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .flow-head__text .section-title {
  margin-top: 0.6rem;
}

.page-about .flow-head__text > p:last-child {
  margin-top: 1rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .flow-figure {
  margin: 0;
}

.page-about .flow-list {
  list-style: none;
  margin: clamp(2.25rem, 4vw, 3.25rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1.9rem;
}

.page-about .flow-node {
  position: relative;
  padding-top: 0.25rem;
}

.page-about .flow-node__badge {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  color: var(--ink);
  background: var(--paper);
  border-radius: 50%;
}

.page-about .flow-node__badge svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  color: var(--line);
}

.page-about .flow-node__badge .mono {
  position: relative;
  font-size: 0.75rem;
  letter-spacing: 0.02em;
}

.page-about .flow-node h3 {
  margin: 0.85rem 0 0;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .flow-node > p {
  margin: 0.5rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--slate);
}

.page-about .flow-node__doc {
  display: block;
  margin-top: 0.85rem;
  padding-top: 0.6rem;
  border-top: var(--hair-soft);
  font-size: 0.8125rem;
  color: var(--ink-2);
}

.page-about .flow-node__doclabel {
  display: inline-block;
  margin-right: 0.4rem;
  padding: 0.1rem 0.4rem;
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--paper);
  background: var(--ink-2);
  border-radius: 1px;
}

@media (min-width: 880px) {
  .page-about .flow-head {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .flow-list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .flow-node {
    padding-right: 1.4rem;
  }

  .page-about .flow-node::before {
    content: "";
    position: absolute;
    top: 1rem;
    left: 1.75rem;
    right: 0;
    border-top: 1px dashed var(--line);
  }

  .page-about .flow-node:last-child::before {
    display: none;
  }
}

/* ---------- 集货仓 ---------- */
.page-about .about-warehouse {
  padding-block: clamp(3rem, 8vw, 6rem) clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .wh-head {
  max-width: 44rem;
}

.page-about .wh-head .section-title {
  margin-top: 0.6rem;
}

.page-about .wh-head > p:last-child {
  margin-top: 1rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .wh-grid {
  margin-top: clamp(2rem, 4vw, 3rem);
  display: grid;
  gap: 1.15rem;
}

.page-about .wh-card {
  background: var(--sand-l);
  border: var(--hair-soft);
  border-radius: var(--radius);
  padding: 1.4rem 1.3rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.page-about .wh-card__city {
  margin: 0;
  font-size: 1.5rem;
  color: var(--ink);
  letter-spacing: 0.06em;
}

.page-about .wh-card__dir {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--amber-deep);
}

.page-about .wh-card__desc {
  margin: 0.35rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--slate);
}

.page-about .wh-figure {
  margin: clamp(2rem, 4vw, 3rem) 0 0;
}

@media (min-width: 860px) {
  .page-about .wh-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.5rem;
    padding-bottom: 3.5rem;
  }

  .page-about .wh-card:nth-child(2) {
    margin-top: 1.75rem;
  }

  .page-about .wh-card:nth-child(3) {
    margin-top: 3.5rem;
  }
}

/* ---------- 质量与合作 ---------- */
.page-about .about-quality {
  padding-block: clamp(3rem, 8vw, 6rem);
}

.page-about .qc-head {
  max-width: 44rem;
}

.page-about .qc-head .section-title {
  margin-top: 0.6rem;
}

.page-about .qc-head > p:last-child {
  margin-top: 1rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .qc-panel {
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .qc-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.page-about .qc-chip {
  appearance: none;
  font: inherit;
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  padding: 0.42rem 0.9rem;
  background: transparent;
  color: var(--slate);
  border: 1px solid rgba(20, 52, 43, 0.22);
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.14s var(--ease), border-color 0.14s var(--ease), background 0.14s var(--ease);
}

.page-about .qc-chip:hover {
  border-color: var(--amber);
  color: var(--ink);
}

.page-about .qc-chip:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

.page-about .qc-chip[aria-pressed="true"],
.page-about .qc-chip.is-active {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--paper);
}

.page-about .qc-list {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .qc-card {
  background: var(--paper);
  border: var(--hair);
  border-radius: var(--radius);
  padding: 1.25rem 1.2rem;
  transition: transform 0.14s var(--ease), border-color 0.14s var(--ease);
}

.page-about .qc-card:hover {
  transform: translateY(-2px);
  border-color: var(--amber);
}

.page-about .qc-card__code {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--slate);
}

.page-about .qc-card h3 {
  margin: 0.45rem 0 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .qc-card p:last-child {
  margin: 0.5rem 0 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--slate);
}

.page-about .qc-empty {
  margin: 1.25rem 0 0;
  font-size: 0.875rem;
  color: var(--slate);
}

@media (min-width: 760px) {
  .page-about .qc-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.1rem;
  }
}

@media (min-width: 1100px) {
  .page-about .qc-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 收束 ---------- */
.page-about .about-close {
  padding-block: clamp(3rem, 8vw, 6rem);
}

.page-about .close-grid {
  display: grid;
  gap: clamp(2rem, 4vw, 3.5rem);
}

.page-about .close-lead .eyebrow {
  color: var(--amber);
}

.page-about .close-lead .section-title {
  color: var(--paper);
  margin-top: 0.6rem;
  max-width: 22ch;
}

.page-about .close-lead > p {
  margin-top: 1rem;
  max-width: 40rem;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(251, 248, 242, 0.76);
}

.page-about .close-cta {
  margin-top: 1.75rem;
}

.page-about .close-figures {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(251, 248, 242, 0.16);
  border: 1px solid rgba(251, 248, 242, 0.16);
  align-self: start;
}

.page-about .close-figures > div {
  background: var(--ink);
  padding: 0.95rem 1rem;
}

.page-about .close-figures dt {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: rgba(251, 248, 242, 0.58);
}

.page-about .close-figures dd {
  margin: 0.35rem 0 0;
  font-size: clamp(1.1rem, 2.2vw, 1.45rem);
  color: var(--paper);
  letter-spacing: 0.04em;
}

.page-about .close-links {
  list-style: none;
  margin: clamp(2rem, 4vw, 3rem) 0 0;
  padding: 1.25rem 0 0;
  border-top: 1px solid rgba(251, 248, 242, 0.16);
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 2rem;
}

.page-about .close-links a {
  color: rgba(251, 248, 242, 0.82);
  text-decoration: none;
  font-size: 0.9375rem;
  border-bottom: 1px solid transparent;
  padding-bottom: 0.15rem;
  transition: color 0.14s var(--ease), border-color 0.14s var(--ease);
}

.page-about .close-links a:hover,
.page-about .close-links a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--amber);
}

@media (min-width: 900px) {
  .page-about .close-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

/* ---------- 入场 ---------- */
.page-about [data-reveal] {
  transition: opacity 0.32s var(--ease), transform 0.32s var(--ease);
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    transition: opacity 0.32s var(--ease);
  }

  .page-about .qc-card:hover {
    transform: none;
  }
}