.page-about {
  --about-gap: clamp(64px, 9vw, 128px);
  --about-line: rgba(159, 179, 200, 0.28);
  --about-line-strong: rgba(159, 179, 200, 0.5);
  --about-line-dark: rgba(232, 241, 247, 0.16);
  --about-cyan-soft: rgba(47, 224, 208, 0.1);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: clamp(40px, 6vw, 76px);
  padding-bottom: clamp(56px, 8vw, 108px);
  overflow: hidden;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 20px;
  margin-top: clamp(32px, 5vw, 64px);
}

.page-about .about-hero__eyebrow {
  font-size: var(--fs-mono);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0;
}

.page-about .about-hero__title {
  margin: 0;
  font-size: var(--fs-h1);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 22ch;
}

.page-about .about-hero__lede {
  margin: 4px 0 0;
  max-width: 40em;
  color: var(--mist);
  font-size: var(--fs-lede);
  line-height: 1.7;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(24px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line-dark);
  border-top: 1px solid var(--about-line-dark);
  border-bottom: 1px solid var(--about-line-dark);
}

.page-about .about-hero__fact {
  background: var(--deep);
  padding: 16px 4px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-hero__fact-num {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: -0.01em;
  line-height: 1;
}

.page-about .about-hero__fact-label {
  font-size: 13px;
  color: var(--steel);
  letter-spacing: 0.04em;
}

/* ---------- 通用章节带 ---------- */

.page-about .about-band {
  padding: var(--about-gap) 0;
  position: relative;
}

.page-about .about-band .section__head {
  margin-bottom: clamp(36px, 5vw, 64px);
  display: grid;
  gap: 10px;
}

.page-about .about-band .section__title {
  font-size: var(--fs-h2);
  font-weight: 900;
  letter-spacing: -0.015em;
  line-height: 1.2;
  margin: 0;
  max-width: 24ch;
}

.page-about .about-band .section__note {
  margin: 0;
  max-width: 40em;
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-band .section__index {
  font-size: var(--fs-mono);
  letter-spacing: 0.2em;
  color: var(--coral);
  margin: 0;
}

.page-about .section__head--invert .section__title {
  color: var(--paper);
}

.page-about .section__head--invert .section__note {
  color: var(--steel);
}

/* ---------- 历程 ---------- */

.page-about .about-history {
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-history__grid {
  display: grid;
  gap: clamp(32px, 5vw, 56px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-history__aside {
  display: grid;
  gap: 20px;
  align-content: start;
}

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

.page-about .about-history__figure .figure__frame {
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--mist);
}

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

.page-about .about-history__figure .figure__caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .about-years {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-years__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 10px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  text-decoration: none;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  transition: color var(--dur) ease, border-color var(--dur) ease, background-color var(--dur) ease;
}

.page-about .about-years__link .mono {
  font-size: 12px;
  font-weight: 700;
  color: var(--violet);
  transition: color var(--dur) ease;
}

.page-about .about-years__link:hover,
.page-about .about-years__link:focus-visible {
  color: var(--ink);
  border-color: var(--cyan);
  background: var(--about-cyan-soft);
  outline: none;
}

.page-about .about-years__link:focus-visible {
  box-shadow: 0 0 0 2px var(--cyan);
}

.page-about .about-years__link:hover .mono,
.page-about .about-years__link:focus-visible .mono {
  color: var(--cyan);
}

.page-about .about-history__phases {
  border-left: 1px solid var(--about-line);
  padding-left: 22px;
}

.page-about .about-phase {
  position: relative;
  padding-bottom: clamp(28px, 4vw, 44px);
  scroll-margin-top: 130px;
}

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

.page-about .about-phase::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px var(--about-cyan-soft);
}

.page-about .about-phase__year {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--violet);
  font-weight: 700;
}

.page-about .about-phase__title {
  margin: 0 0 10px;
  font-size: var(--fs-h3);
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .about-phase__text {
  margin: 0;
  max-width: 38em;
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--ink-soft);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  background: var(--navy);
  color: var(--paper);
}

.page-about .about-team__layout {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
}

.page-about .about-team__figure {
  margin: 0;
  order: 1;
}

.page-about .about-team__figure .figure__frame {
  border: 1px solid var(--about-line-dark);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--mid);
}

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

.page-about .about-team__figure .figure__caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .about-team__filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  order: 2;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--about-line-dark);
}

.page-about .about-team__filter .filter-bar__group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-team__filter .filter-count {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

.page-about .about-team__filter .filter-chip {
  font-family: inherit;
  font-size: 13px;
  padding: 7px 13px;
  color: var(--mist);
  background: transparent;
  border: 1px solid var(--about-line-strong);
  border-radius: var(--radius);
  cursor: pointer;
  transition: color var(--dur) ease, border-color var(--dur) ease, background-color var(--dur) ease;
}

.page-about .about-team__filter .filter-chip:hover,
.page-about .about-team__filter .filter-chip:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  background: var(--about-cyan-soft);
  outline: none;
}

.page-about .about-team__filter .filter-chip[aria-pressed="true"],
.page-about .about-team__filter .filter-chip.is-active {
  color: var(--deep);
  background: var(--cyan);
  border-color: var(--cyan);
  font-weight: 700;
}

.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  order: 3;
  background: var(--about-line-dark);
  border-top: 1px solid var(--about-line-dark);
}

.page-about .about-team__item {
  background: var(--navy);
  padding: 22px 20px 24px;
  border-left: 3px solid var(--steel);
  transition: background-color var(--dur) ease, border-color var(--dur) ease;
}

.page-about .about-team__item--edit {
  border-left-color: var(--cyan);
}

.page-about .about-team__item--test {
  border-left-color: var(--coral);
}

.page-about .about-team__item--nav {
  border-left-color: var(--violet);
}

.page-about .about-team__item:hover {
  background: var(--mid);
}

.page-about .about-team__head {
  margin: 0 0 10px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-team__name {
  font-size: var(--fs-h3);
  font-weight: 700;
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-about .about-team__count {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--steel);
  white-space: nowrap;
}

.page-about .about-team__text {
  margin: 0;
  max-width: 38em;
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--mist);
}

/* ---------- 出品流程 ---------- */

.page-about .about-flow {
  background: var(--mist);
  color: var(--ink);
}

.page-about .about-flow__grid {
  display: grid;
  gap: clamp(32px, 5vw, 52px);
}

.page-about .about-flow__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  grid-template-columns: minmax(0, 1fr);
  counter-reset: flow;
}

.page-about .about-flow__step {
  position: relative;
  padding: 20px 0 20px 20px;
  border-top: 1px solid rgba(7, 26, 47, 0.14);
  border-left: 2px solid transparent;
  transition: border-left-color var(--dur) ease, background-color var(--dur) ease;
}

.page-about .about-flow__step:last-child {
  border-bottom: 1px solid rgba(7, 26, 47, 0.14);
}

.page-about .about-flow__step:hover,
.page-about .about-flow__step:focus-within {
  border-left-color: var(--cyan);
  background: rgba(47, 224, 208, 0.07);
}

.page-about .about-flow__no {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--violet);
  font-weight: 700;
}

.page-about .about-flow__title {
  margin: 0 0 8px;
  font-size: var(--fs-h3);
  font-weight: 700;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-flow__text {
  margin: 0;
  max-width: 34em;
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--ink-soft);
}

.page-about .about-flow__out {
  margin: 12px 0 0;
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--steel);
  transition: color var(--dur) ease;
}

.page-about .about-flow__step:hover .about-flow__out,
.page-about .about-flow__step:focus-within .about-flow__out {
  color: var(--mid);
}

.page-about .about-flow__figure {
  margin: 0;
  align-self: start;
}

.page-about .about-flow__figure .figure__frame {
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--paper);
}

.page-about .about-flow__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: contain;
}

.page-about .about-flow__figure .figure__caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---------- 规模 ---------- */

.page-about .about-scale {
  background: var(--deep);
  color: var(--paper);
}

.page-about .about-metrics {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-line-dark);
  border-top: 1px solid var(--about-line-dark);
  border-bottom: 1px solid var(--about-line-dark);
}

.page-about .about-metrics__item {
  background: var(--deep);
  padding: 22px 18px 24px;
  display: grid;
  gap: 6px;
  align-content: start;
  transition: background-color var(--dur) ease;
}

.page-about .about-metrics__item:hover {
  background: var(--navy);
}

.page-about .about-metrics__value {
  margin: 0;
  font-size: clamp(30px, 5vw, 46px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-metrics__unit {
  font-size: 0.44em;
  font-weight: 500;
  color: var(--steel);
  margin-left: 4px;
  letter-spacing: 0.04em;
}

.page-about .about-metrics__label {
  margin: 0;
  font-size: 14px;
  font-weight: 700;
  color: var(--paper);
  letter-spacing: 0.02em;
}

.page-about .about-metrics__note {
  margin: 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .about-scale__foot {
  margin: clamp(28px, 4vw, 44px) 0 0;
  max-width: 42em;
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--mist);
}

/* ---------- 合作与认可 ---------- */

.page-about .about-partner {
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-partner__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-partner__block {
  position: relative;
  padding: 24px 0 0;
  border-top: 2px solid var(--mid);
  transition: border-color var(--dur) ease;
}

.page-about .about-partner__block:nth-child(1) {
  border-top-color: var(--cyan);
}

.page-about .about-partner__block:nth-child(2) {
  border-top-color: var(--coral);
}

.page-about .about-partner__block:nth-child(3) {
  border-top-color: var(--violet);
}

.page-about .about-partner__block:hover {
  border-top-color: var(--mid);
}

.page-about .about-partner__num {
  margin: 0 0 8px;
  font-size: clamp(26px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--mid);
  letter-spacing: -0.01em;
}

.page-about .about-partner__title {
  margin: 0 0 10px;
  font-size: var(--fs-h3);
  font-weight: 700;
  line-height: 1.32;
  color: var(--ink);
}

.page-about .about-partner__text {
  margin: 0;
  max-width: 34em;
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--ink-soft);
}

/* ---------- 工作方式 ---------- */

.page-about .about-method {
  background: var(--navy);
  color: var(--paper);
}

.page-about .about-method__layout {
  display: grid;
  gap: clamp(32px, 5vw, 56px);
}

.page-about .about-method__title {
  margin: 0 0 16px;
  font-size: var(--fs-h2);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-method__lede {
  margin: 0 0 clamp(20px, 3vw, 32px);
  max-width: 34em;
  font-size: var(--fs-lede);
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-method__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line-dark);
  border-top: 1px solid var(--about-line-dark);
  border-bottom: 1px solid var(--about-line-dark);
}

.page-about .about-method__item {
  background: var(--navy);
  padding: 14px 12px 14px 20px;
  position: relative;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--mist);
  transition: background-color var(--dur) ease;
}

.page-about .about-method__item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--coral);
}

.page-about .about-method__item:hover {
  background: var(--mid);
}

.page-about .about-method__note {
  margin: 22px 0 0;
  max-width: 38em;
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--steel);
}

.page-about .about-method__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 224, 208, 0.4);
  transition: border-color var(--dur) ease, color var(--dur) ease;
}

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

.page-about .about-method__aside {
  align-self: start;
  padding: 24px 20px 26px;
  border: 1px solid var(--about-line-strong);
  border-left: 3px solid var(--coral);
  border-radius: var(--radius);
  background: var(--deep);
  display: grid;
  gap: 12px;
}

.page-about .about-method__aside-label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--coral);
}

.page-about .about-method__aside-text {
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-method__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}

.page-about .about-method__contact {
  margin: 6px 0 0;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--cyan);
  word-break: break-all;
}

.page-about .about-method__aside .copy-btn {
  justify-self: start;
  font-family: inherit;
  font-size: 12px;
  letter-spacing: 0.06em;
  padding: 7px 12px;
  color: var(--steel);
  background: transparent;
  border: 1px solid var(--about-line-strong);
  border-radius: var(--radius);
  cursor: pointer;
  transition: color var(--dur) ease, border-color var(--dur) ease, background-color var(--dur) ease;
}

.page-about .about-method__aside .copy-btn:hover,
.page-about .about-method__aside .copy-btn:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  background: var(--about-cyan-soft);
  outline: none;
}

.page-about .about-method__aside .copy-btn[data-copied="true"] {
  color: var(--deep);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 响应式 ---------- */

@media (max-width: 599px) {
  .page-about .about-hero__facts {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-hero__fact {
    padding: 14px 2px;
  }

  .page-about .about-history__phases {
    padding-left: 16px;
  }

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

  .page-about .about-method__actions .btn {
    flex: 1 1 auto;
    text-align: center;
  }
}

@media (min-width: 700px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-history__grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 8fr);
    align-items: start;
  }

  .page-about .about-history__aside {
    position: sticky;
    top: 120px;
  }

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

  .page-about .about-flow__grid {
    grid-template-columns: minmax(0, 1fr) minmax(280px, 360px);
    align-items: start;
  }

  .page-about .about-flow__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(28px, 4vw, 48px);
  }

  .page-about .about-partner__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-method__layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }
}

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

  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    grid-template-areas:
      "figure filter"
      "figure list";
    column-gap: clamp(32px, 4vw, 56px);
    row-gap: 20px;
    align-items: start;
  }

  .page-about .about-team__figure {
    grid-area: figure;
  }

  .page-about .about-team__filter {
    grid-area: filter;
  }

  .page-about .about-team__list {
    grid-area: list;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-years__link,
  .page-about .about-team__filter .filter-chip,
  .page-about .about-team__item,
  .page-about .about-flow__step,
  .page-about .about-flow__out,
  .page-about .about-metrics__item,
  .page-about .about-partner__block,
  .page-about .about-method__item,
  .page-about .about-method__note a,
  .page-about .about-method__aside .copy-btn {
    transition: none;
  }
}