.page-about {
  --about-measure: 36rem;
  --about-rule: rgba(169, 187, 164, 0.36);
  --about-rule-soft: rgba(169, 187, 164, 0.2);
  background: var(--c-chalk);
  color: var(--c-ink);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: clamp(1rem, 3vw, 1.6rem);
}
.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .breadcrumb li {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--c-ink-2);
}
.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 0.35rem;
  color: var(--c-line);
}
.page-about .breadcrumb a {
  color: var(--c-green);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .breadcrumb a:hover {
  color: var(--c-ink);
  border-bottom-color: var(--c-lemon);
}

/* ---------- 共享小构件（页面内微调） ---------- */
.page-about .micro {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-line);
  margin: 0;
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--c-green);
}
.page-about .about-kicker::before {
  content: "";
  width: 24px;
  height: 2px;
  background: var(--c-lemon);
  display: block;
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.7rem, 5.2vw, 3rem);
  line-height: 1.02;
  letter-spacing: -0.01em;
  margin: 0.6rem 0 1rem;
  color: var(--c-ink);
}

.page-about .about-desc {
  max-width: var(--about-measure);
  font-size: 1rem;
  line-height: 1.78;
  color: var(--c-ink-2);
  margin: 0 0 0.9rem;
}

.page-about .about-section-head {
  max-width: 46rem;
  margin-bottom: clamp(1.6rem, 4vw, 2.6rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--c-chalk);
  padding: clamp(1.4rem, 4vw, 2.4rem) 0 clamp(2.8rem, 7vw, 5.2rem);
}
.page-about .about-hero__wedge {
  position: absolute;
  top: -26%;
  right: -18%;
  width: 68%;
  height: 156%;
  background: linear-gradient(148deg, var(--c-green) 0%, var(--c-ink-2) 96%);
  opacity: 0.13;
  transform: rotate(-6deg);
  border-radius: var(--radius-organic);
  pointer-events: none;
}
.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.6rem, 5vw, 3rem);
}
.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.2rem, 8.6vw, 4.7rem);
  line-height: 0.96;
  letter-spacing: -0.01em;
  margin: 0.75rem 0 1.1rem;
  color: var(--c-ink);
}
.page-about .about-hero__lede {
  max-width: var(--about-measure);
  font-size: 1.02rem;
  line-height: 1.78;
  color: var(--c-ink-2);
  margin: 0 0 0.85rem;
}
.page-about .about-hero__lede:last-child {
  margin-bottom: 0;
}

/* 索引面板 */
.page-about .about-hero__index {
  background: var(--c-navy);
  color: var(--c-white);
  border-radius: var(--radius-organic);
  padding: clamp(1.15rem, 3vw, 1.6rem) clamp(1.15rem, 3vw, 1.5rem);
}
.page-about .about-hero__index .micro {
  color: var(--c-line);
  letter-spacing: 0.2em;
}
.page-about .about-index {
  list-style: none;
  margin: 0.75rem 0 0;
  padding: 0;
}
.page-about .about-index li {
  border-top: 1px solid var(--about-rule-soft);
}
.page-about .about-index li:last-child {
  border-bottom: 1px solid var(--about-rule-soft);
}
.page-about .about-index a {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.72rem 0.1rem;
  color: var(--c-white);
  text-decoration: none;
  font-size: 0.95rem;
  line-height: 1.4;
  transition: color 0.2s var(--ease), padding-left 0.2s var(--ease);
}
.page-about .about-index a::before {
  content: "-";
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--c-lemon);
}
.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--c-lemon);
  padding-left: 0.4rem;
}

/* ---------- 横向数据带 ---------- */
.page-about .about-band {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.2rem 2.2rem;
}
.page-about .about-band .stat {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  min-width: 4.6rem;
}
.page-about .about-band .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1;
  color: var(--c-lemon);
}
.page-about .about-band .stat-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: rgba(242, 246, 234, 0.82);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-versions {
  background: var(--c-chalk);
}
.page-about .about-timeline {
  position: relative;
  border-top: 1px solid var(--about-rule);
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 1rem;
  bottom: 1rem;
  width: 1px;
  background: var(--about-rule);
}
.page-about .about-tl {
  position: relative;
  border-bottom: 1px solid var(--about-rule);
}
.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 1.85rem;
  width: 9px;
  height: 9px;
  background: var(--c-orange);
  transform: rotate(45deg);
  transition: background 0.2s var(--ease), transform 0.2s var(--ease);
  z-index: 1;
}
.page-about .about-tl:hover::before {
  background: var(--c-lemon);
  transform: rotate(45deg) scale(1.2);
}
.page-about .about-tl .expand-trigger {
  width: 100%;
  display: grid;
  grid-template-columns: 3.1rem minmax(0, 1fr) 1.4rem;
  grid-template-areas:
    "num meta icon"
    "num title icon";
  align-items: baseline;
  gap: 0.25rem 0.9rem;
  padding: 1.45rem 0.2rem 1.45rem 2.2rem;
  background: none;
  border: 0;
  font: inherit;
  color: inherit;
  text-align: left;
  cursor: pointer;
}
.page-about .about-tl__num {
  grid-area: num;
  justify-self: start;
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1;
  color: var(--c-lemon);
  background: var(--c-ink);
  border-radius: var(--radius-s);
  padding: 0.24rem 0.4rem;
}
.page-about .about-tl__meta {
  grid-area: meta;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-green);
}
.page-about .about-tl__title {
  grid-area: title;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.12rem, 3.6vw, 1.62rem);
  line-height: 1.14;
  color: var(--c-ink);
}
.page-about .about-tl .expand-icon {
  grid-area: icon;
  align-self: center;
  justify-self: end;
}
.page-about .about-tl .expand-panel-inner {
  padding: 0 0.2rem 1.5rem 6rem;
}
.page-about .about-tl .expand-panel-inner p {
  max-width: var(--about-measure);
  margin: 0;
  font-size: 0.97rem;
  line-height: 1.78;
  color: var(--c-ink-2);
}
.page-about .about-tl .expand-panel-inner a {
  color: var(--c-green);
  text-decoration: none;
  border-bottom: 1px solid var(--c-line);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}
.page-about .about-tl .expand-panel-inner a:hover {
  color: var(--c-ink);
  border-bottom-color: var(--c-lemon);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--c-chalk);
}
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.8rem, 5vw, 3rem);
}
.page-about .about-team__list {
  margin-top: 0.6rem;
  border-top: 1px solid var(--about-rule);
}
.page-about .about-team__item {
  border-bottom: 1px solid var(--about-rule);
}
.page-about .about-team__item .expand-trigger {
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.9rem;
  padding: 1.1rem 0.2rem;
  background: none;
  border: 0;
  font: inherit;
  color: inherit;
  text-align: left;
  cursor: pointer;
}
.page-about .about-team__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.16rem;
  line-height: 1.2;
  color: var(--c-ink);
}
.page-about .about-team__count {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--c-white);
  background: var(--c-green);
  border-radius: 999px;
  padding: 0.16rem 0.6rem;
}
.page-about .about-team__item .expand-icon {
  margin-left: auto;
}
.page-about .about-team__item .expand-panel-inner {
  padding: 0 0.2rem 1.25rem;
}
.page-about .about-team__item .expand-panel-inner ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
  max-width: var(--about-measure);
}
.page-about .about-team__item .expand-panel-inner li {
  display: flex;
  gap: 0.65rem;
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--c-ink-2);
}
.page-about .about-team__item .expand-panel-inner li::before {
  content: "—";
  font-family: var(--font-mono);
  color: var(--c-glow);
  flex: none;
}
.page-about .about-team__fig {
  margin: 0;
}
.page-about .about-team__fig img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-m);
}
.page-about .about-team__fig figcaption {
  margin-top: 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--c-line);
}

/* ---------- 三道工序 ---------- */
.page-about .about-flow {
  background: var(--c-navy);
  color: var(--c-chalk);
}
.page-about .about-flow .micro {
  color: var(--c-glow);
}
.page-about .about-flow .about-h2 {
  color: var(--c-white);
}
.page-about .about-flow .about-desc {
  color: rgba(242, 246, 234, 0.78);
}
.page-about .about-flow__media {
  position: relative;
  margin: 0 0 clamp(1.8rem, 4vw, 2.8rem);
  border-radius: var(--radius-m);
  overflow: hidden;
  background: var(--c-ink);
}
.page-about .about-flow__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-flow__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 18, 12, 0) 42%, rgba(10, 18, 12, 0.68) 100%);
  pointer-events: none;
}
.page-about .about-flow__media figcaption {
  position: absolute;
  left: clamp(0.9rem, 3vw, 1.5rem);
  bottom: clamp(0.8rem, 2.4vw, 1.3rem);
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--c-chalk);
}
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-rule);
}
.page-about .about-step {
  display: grid;
  grid-template-columns: 2.5rem minmax(0, 1fr);
  gap: 0.25rem 1rem;
  padding: 1.3rem 0;
  border-bottom: 1px solid var(--about-rule);
}
.page-about .about-step__num {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 4.4vw, 1.75rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1;
  color: var(--c-lemon);
}
.page-about .about-step__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.14rem;
  line-height: 1.2;
  color: var(--c-white);
}
.page-about .about-step__desc {
  margin: 0.35rem 0 0;
  max-width: var(--about-measure);
  font-size: 0.94rem;
  line-height: 1.75;
  color: rgba(242, 246, 234, 0.78);
}

/* ---------- 覆盖与服务 ---------- */
.page-about .about-coverage {
  background: var(--c-chalk);
}
.page-about .about-coverage__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.8rem, 5vw, 3.2rem);
}
.page-about .about-coverage__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.4rem 2rem;
}
.page-about .about-cov {
  border-top: 1px solid var(--about-rule);
  padding-top: 1rem;
  transition: border-color 0.22s var(--ease);
}
.page-about .about-cov:hover {
  border-top-color: var(--c-lemon);
}
.page-about .about-cov__label {
  color: var(--c-green);
}
.page-about .about-cov__title {
  margin: 0.5rem 0 0.45rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.2rem;
  line-height: 1.18;
  color: var(--c-ink);
}
.page-about .about-cov__text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--c-ink-2);
}

/* ---------- 我们更在意的事 ---------- */
.page-about .about-principles {
  position: relative;
  overflow: hidden;
  background: var(--c-ink);
  color: var(--c-chalk);
}
.page-about .about-principles__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.page-about .about-principles__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.36;
}
.page-about .about-principles__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 18, 12, 0.72) 0%, rgba(10, 18, 12, 0.95) 100%);
}
.page-about .about-principles__inner {
  position: relative;
  z-index: 1;
}
.page-about .about-principles .micro {
  color: var(--c-glow);
}
.page-about .about-principles .about-h2 {
  color: var(--c-white);
}
.page-about .about-principles .about-desc {
  color: rgba(242, 246, 234, 0.76);
}
.page-about .about-principles__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.3rem;
  border-top: 1px solid var(--about-rule);
  padding-top: 1.3rem;
}
.page-about .about-principle {
  border-left: 2px solid var(--c-lemon);
  padding-left: 1rem;
}
.page-about .about-principle__title {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.12rem;
  line-height: 1.2;
  color: var(--c-white);
}
.page-about .about-principle p {
  margin: 0;
  max-width: 32rem;
  font-size: 0.94rem;
  line-height: 1.75;
  color: rgba(242, 246, 234, 0.78);
}
.page-about .about-principle a {
  color: var(--c-lemon);
  text-decoration: none;
  border-bottom: 1px solid rgba(216, 245, 66, 0.5);
}
.page-about .about-principle a:hover {
  border-bottom-color: var(--c-lemon);
}

/* ---------- 下一步 ---------- */
.page-about .about-next__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.4rem 2rem;
}
.page-about .about-next__kicker {
  color: var(--c-glow);
}
.page-about .about-next__title {
  margin: 0.5rem 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 4.6vw, 2.3rem);
  line-height: 1.05;
  color: var(--c-white);
}
.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 0.85rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-coverage__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-principles__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7.2fr) minmax(0, 4.8fr);
    align-items: end;
    gap: clamp(2rem, 5vw, 4.5rem);
  }
  .page-about .about-tl .expand-trigger {
    grid-template-columns: 3.4rem 7.5rem minmax(0, 1fr) 1.4rem;
    grid-template-areas: "num meta title icon";
    align-items: center;
    gap: 0.2rem 1.3rem;
    padding: 1.6rem 0.2rem 1.6rem 2.2rem;
  }
  .page-about .about-tl .expand-panel-inner {
    padding-left: 12.1rem;
  }
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: clamp(2rem, 5vw, 3.6rem);
  }
  .page-about .about-team__fig {
    margin-top: 2.4rem;
    margin-left: -2.5rem;
  }
  .page-about .about-coverage__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: clamp(2rem, 5vw, 4rem);
  }
  .page-about .about-coverage__list {
    gap: 1.6rem 2.4rem;
  }
}

@media (min-width: 1280px) {
  .page-about .about-steps {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 2.4rem;
    border-top: 1px solid var(--about-rule);
  }
  .page-about .about-step {
    grid-template-columns: minmax(0, 1fr);
    border-bottom: 0;
    border-top: 0;
    padding-top: 1.5rem;
  }
  .page-about .about-step__num {
    grid-row: auto;
    margin-bottom: 0.7rem;
  }
}