.page-about {
  --about-line: rgba(212, 166, 83, 0.22);
  --about-soft: rgba(233, 236, 239, 0.09);
  background: var(--ink);
  color: var(--paper);
  overflow-x: hidden;
}

/* ---------- 通用小件 ---------- */
.page-about a.about-inline {
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(212, 166, 83, 0.42);
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease);
}

.page-about a.about-inline:hover,
.page-about a.about-inline:focus-visible {
  color: var(--gold-hi);
  border-bottom-color: var(--gold-hi);
}

.page-about .about-head {
  max-width: 54em;
  margin-bottom: clamp(28px, 4vw, 52px);
}

.page-about .about-head__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1.26;
  letter-spacing: -0.01em;
  margin: 10px 0 0;
  color: var(--paper);
}

.page-about .about-head__lead {
  margin: 16px 0 0;
  color: var(--fog);
  font-size: 16px;
  line-height: 1.85;
  max-width: 44em;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(36px, 6vw, 80px) clamp(44px, 7vw, 92px);
  border-bottom: 1px solid var(--about-soft);
  background:
    radial-gradient(120% 90% at 88% 8%, rgba(14, 42, 43, 0.85) 0%, rgba(11, 13, 16, 0) 62%),
    linear-gradient(180deg, rgba(21, 26, 32, 0.55) 0%, rgba(11, 13, 16, 0) 100%);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(52px, 13vw, 128px);
  line-height: 0.94;
  letter-spacing: -0.025em;
  margin: 10px 0 0;
  color: var(--paper);
}

.page-about .about-hero__code {
  margin: 22px 0 0;
  color: var(--fog);
  font-size: 13px;
  letter-spacing: 0.16em;
}

.page-about .about-hero__lede {
  margin: 0;
  font-size: clamp(18px, 2.3vw, 22px);
  line-height: 1.72;
  color: var(--paper);
  max-width: 32em;
}

.page-about .about-hero__text {
  margin: 18px 0 0;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--fog);
  max-width: 34em;
}

.page-about .about-hero__stat {
  margin-top: clamp(28px, 4vw, 46px);
  padding-top: 20px;
  border-top: 1px solid var(--about-line);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-hero__statnum {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(54px, 8vw, 86px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--gold-hi);
  display: block;
}

.page-about .about-hero__statunit {
  font-size: 0.4em;
  margin-left: 6px;
  color: var(--gold);
}

.page-about .about-hero__statlabel {
  color: var(--fog);
  font-size: 14px;
  letter-spacing: 0.02em;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: end;
    gap: clamp(40px, 6vw, 96px);
  }

  .page-about .about-hero__stat {
    margin-top: 48px;
  }
}

/* ---------- 沿革与时间线 ---------- */
.page-about .about-chron__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
}

.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
  position: relative;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 10px;
  width: 1.5px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(212, 166, 83, 0.16) 100%);
}

.page-about .about-tl__item {
  position: relative;
  padding-bottom: clamp(26px, 3.2vw, 40px);
}

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

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 7px;
  width: 9px;
  height: 9px;
  background: var(--ink);
  border: 1.5px solid var(--gold);
  transition: background var(--t) var(--ease), box-shadow var(--t) var(--ease);
}

.page-about .about-tl__item:hover::before,
.page-about .about-tl__item:focus-within::before {
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(212, 166, 83, 0.15);
}

.page-about .about-tl__year {
  margin: 0 0 8px;
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-tl__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  line-height: 1.42;
  color: var(--paper);
}

.page-about .about-tl__desc {
  margin: 10px 0 0;
  color: var(--fog);
  font-size: 15px;
  line-height: 1.85;
  max-width: 34em;
}

.page-about .about-chron__fig {
  margin: 0;
  border: 1px solid var(--about-line);
  background: var(--panel-2);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
}

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

.page-about .about-chron__figcap {
  display: block;
  padding: 12px 18px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--fog);
  border-top: 1px solid var(--about-soft);
}

@media (min-width: 900px) {
  .page-about .about-chron__grid {
    grid-template-columns: minmax(0, 4.5fr) minmax(0, 6.5fr);
    gap: clamp(40px, 5vw, 80px);
    align-items: start;
  }
}

/* ---------- 画册式停顿图 ---------- */
.page-about .about-pause {
  margin: 0;
  position: relative;
  overflow: hidden;
  border-block: 1px solid var(--about-soft);
  background: var(--panel-2);
}

.page-about .about-pause img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: clamp(300px, 62vh, 600px);
  object-fit: cover;
  filter: saturate(0.7) contrast(1.05) brightness(0.8);
}

.page-about .about-pause::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 13, 16, 0.6) 0%, rgba(11, 13, 16, 0) 42%, rgba(11, 13, 16, 0.82) 100%);
  pointer-events: none;
}

.page-about .about-pause__cap {
  position: absolute;
  left: var(--gutter);
  right: var(--gutter);
  bottom: 24px;
  z-index: 2;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--paper);
  opacity: 0.82;
}

/* ---------- 三类需求 ---------- */
.page-about .about-need {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-need__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding-block: clamp(20px, 3vw, 32px);
  border-top: 1px solid var(--about-soft);
}

.page-about .about-need__item:last-child {
  border-bottom: 1px solid var(--about-soft);
}

.page-about .about-need__idx {
  color: var(--gold);
  font-size: 13px;
  letter-spacing: 0.16em;
}

.page-about .about-need__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(19px, 2.6vw, 24px);
  line-height: 1.42;
  color: var(--paper);
}

.page-about .about-need__text {
  margin: 10px 0 0;
  color: var(--fog);
  font-size: 15.5px;
  line-height: 1.88;
  max-width: 44em;
}

@media (min-width: 760px) {
  .page-about .about-need__item {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: clamp(16px, 3vw, 48px);
    align-items: start;
  }
}

/* ---------- 团队与维护节奏 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
}

.page-about .about-team__fig {
  margin: 0;
  border: 1px solid var(--about-soft);
  background: var(--teal);
  overflow: hidden;
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 0 100%);
}

.page-about .about-team__fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  opacity: 0.92;
}

.page-about .about-team__list {
  list-style: none;
  margin: clamp(24px, 3.5vw, 40px) 0 0;
  padding: 0;
}

.page-about .about-team__item {
  padding-block: 18px;
  border-top: 1px solid var(--about-soft);
}

.page-about .about-team__item:last-child {
  border-bottom: 1px solid var(--about-soft);
}

.page-about .about-team__tag {
  display: inline-block;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--gold);
  margin-bottom: 8px;
}

.page-about .about-team__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .about-team__desc {
  margin: 8px 0 0;
  color: var(--fog);
  font-size: 15px;
  line-height: 1.85;
  max-width: 40em;
}

.page-about .about-fold {
  margin-top: clamp(24px, 3.5vw, 40px);
  border: 1px solid var(--about-line);
  background: var(--panel-2);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
}

.page-about .about-fold__sum {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  list-style: none;
  padding: 16px 20px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 500;
  color: var(--paper);
  transition: color var(--t) var(--ease), background var(--t) var(--ease);
}

.page-about .about-fold__sum::-webkit-details-marker {
  display: none;
}

.page-about .about-fold__sum:hover {
  color: var(--gold-hi);
  background: rgba(212, 166, 83, 0.06);
}

.page-about .about-fold__sum::after {
  content: "＋";
  flex: none;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--gold);
}

.page-about .about-fold[open] .about-fold__sum {
  border-bottom: 1px solid var(--about-soft);
}

.page-about .about-fold[open] .about-fold__sum::after {
  content: "－";
}

.page-about .about-fold__body {
  padding: 18px 20px 22px;
  color: var(--fog);
  font-size: 15px;
  line-height: 1.88;
}

.page-about .about-fold__body p {
  margin: 0 0 12px;
}

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

@media (min-width: 900px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(40px, 5vw, 80px);
    align-items: start;
  }

  .page-about .about-team__fig {
    margin-top: 56px;
  }
}

/* ---------- 覆盖与兼容 ---------- */
.page-about .about-reach {
  background: linear-gradient(155deg, var(--teal) 0%, rgba(14, 42, 43, 0.36) 62%, rgba(11, 13, 16, 0) 100%);
  border-block: 1px solid var(--about-line);
}

.page-about .about-reach__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-reach__figure {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(84px, 15vw, 152px);
  line-height: 0.85;
  letter-spacing: -0.035em;
  color: var(--gold-hi);
}

.page-about .about-reach__unit {
  display: block;
  margin-top: 14px;
  color: var(--fog);
  font-size: 14px;
  letter-spacing: 0.06em;
}

.page-about .about-reach__list {
  margin: clamp(24px, 3.5vw, 36px) 0 0;
  padding: 0;
}

.page-about .about-reach__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding-block: 15px;
  border-top: 1px solid rgba(212, 166, 83, 0.24);
}

.page-about .about-reach__row:last-child {
  border-bottom: 1px solid rgba(212, 166, 83, 0.24);
}

.page-about .about-reach__term {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-reach__desc {
  margin: 0;
  color: var(--paper);
  font-size: 15px;
  line-height: 1.8;
}

@media (min-width: 640px) {
  .page-about .about-reach__row {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

@media (min-width: 880px) {
  .page-about .about-reach__grid {
    grid-template-columns: minmax(0, 3.5fr) minmax(0, 8fr);
    gap: clamp(40px, 6vw, 88px);
    align-items: start;
  }
}

/* ---------- 备案与索引 ---------- */
.page-about .about-legal {
  background: linear-gradient(160deg, var(--indigo) 0%, rgba(34, 26, 56, 0.42) 70%, rgba(11, 13, 16, 0) 100%);
  border-bottom: 1px solid var(--about-soft);
}

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

.page-about .about-legal__text {
  margin: 0 0 14px;
  color: var(--fog);
  font-size: 15.5px;
  line-height: 1.88;
  max-width: 44em;
}

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

.page-about .about-legal__icp {
  color: var(--gold-hi);
  font-size: 14px;
  letter-spacing: 0.04em;
}

.page-about .about-index {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  align-content: start;
}

.page-about .about-index__link {
  display: block;
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--about-line);
  background: rgba(21, 26, 32, 0.72);
  color: var(--paper);
  text-decoration: none;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
  transition: background var(--t) var(--ease), border-color var(--t) var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  background: rgba(21, 26, 32, 0.98);
  border-color: var(--gold);
}

.page-about .about-index__tag {
  display: block;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--gold);
  margin-bottom: 10px;
}

.page-about .about-index__name {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 21px;
  line-height: 1.3;
  margin-bottom: 6px;
}

.page-about .about-index__desc {
  display: block;
  color: var(--fog);
  font-size: 14px;
  line-height: 1.78;
}

@media (min-width: 760px) {
  .page-about .about-index {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 980px) {
  .page-about .about-legal__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: clamp(40px, 6vw, 80px);
    align-items: start;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__item::before,
  .page-about .about-fold__sum,
  .page-about .about-index__link,
  .page-about a.about-inline {
    transition: none;
  }
}