.page-about {
  --about-rail-top: 108px;
  --about-shadow-step: 9px 9px 0 -1px rgba(38, 51, 77, .42);
  color: var(--ink);
}

.page-about .breadcrumb {
  padding-block: clamp(.9rem, 2.4vw, 1.4rem) 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(1.5rem, 4vw, 2.5rem) clamp(2rem, 5vw, 3.75rem);
  background:
    linear-gradient(162deg, var(--bg-deep) 0%, #08111F 46%, #0A1526 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -18%;
  right: -12%;
  width: min(52vw, 640px);
  aspect-ratio: 1 / 1;
  background: linear-gradient(140deg, rgba(40, 228, 217, .2), rgba(15, 143, 150, .07) 55%, transparent 78%);
  transform: rotate(-14deg);
  clip-path: polygon(-6% 0, 100% 0, 106% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -12%;
  bottom: 22%;
  width: 68%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--orange) 48%, transparent);
  transform: rotate(-6deg);
  opacity: .5;
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: end;
}

.page-about .about-hero h1 {
  margin: .7rem 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.95rem, 6vw, 4rem);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .about-hero .lede {
  margin-top: 1rem;
  font-size: clamp(.98rem, 1.5vw, 1.08rem);
  line-height: 1.8;
  color: var(--ink-dim);
  max-width: 62ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.5rem;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  box-shadow: var(--about-shadow-step);
}

.page-about .about-hero__stats .stat {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  padding: clamp(.9rem, 2.2vw, 1.3rem);
  background: linear-gradient(160deg, rgba(20, 31, 51, .94), rgba(12, 21, 38, .94));
}

.page-about .about-hero__stats .stat__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.45rem, 3.4vw, 2.1rem);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -.01em;
}

.page-about .about-hero__stats .stat:nth-child(2) .stat__value {
  color: var(--orange);
}

.page-about .about-hero__stats .stat__label {
  font-size: .82rem;
  line-height: 1.5;
  color: var(--ink-dim);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  background: linear-gradient(180deg, var(--bg-deep) 0%, rgba(12, 21, 38, .7) 100%);
}

.page-about .about-timeline__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 2.5rem);
  align-items: start;
}

.page-about .about-rail {
  border-left: 3px solid var(--cyan);
  padding: .25rem 0 .25rem clamp(1rem, 2.6vw, 1.5rem);
  background: linear-gradient(180deg, rgba(40, 228, 217, .07), transparent 62%);
}

.page-about .about-rail__title {
  margin: .5rem 0 .75rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.3rem, 3vw, 1.85rem);
  line-height: 1.28;
  color: var(--ink);
}

.page-about .about-rail__note {
  margin: 0 0 1.25rem;
  font-size: .93rem;
  line-height: 1.75;
  color: var(--ink-dim);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .15rem;
}

.page-about .about-rail__item {
  display: flex;
  align-items: baseline;
  gap: .7rem;
  padding: .45rem .5rem .45rem .85rem;
  border-left: 2px solid var(--line);
  font-size: .9rem;
  color: var(--ink-dim);
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.page-about .about-rail__item:hover {
  border-left-color: var(--cyan);
  color: var(--ink);
}

.page-about .about-rail__item .num {
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-about .about-flow {
  display: grid;
  gap: clamp(1.25rem, 3vw, 1.9rem);
}

.page-about .about-flow__figure {
  margin: 0;
  padding: 8px;
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(20, 31, 51, .9), rgba(12, 21, 38, .9));
  box-shadow: var(--about-shadow-step);
}

.page-about .about-flow__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about .about-flow__caption {
  padding: .65rem .35rem .15rem;
  font-size: .8rem;
  color: var(--ink-dim);
}

.page-about .about-flow__list {
  display: grid;
  gap: clamp(1rem, 2.4vw, 1.5rem);
}

.page-about .about-flow__node {
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr);
  align-items: start;
}

.page-about .about-flow__scale {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .45rem;
  padding-top: 1.2rem;
}

.page-about .about-flow__scale::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: -1.6rem;
  left: 50%;
  width: 1px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, var(--line) 0%, rgba(38, 51, 77, .2) 100%);
}

.page-about .about-flow__node:last-child .about-flow__scale::before {
  background: linear-gradient(180deg, var(--line) 0%, transparent 80%);
}

.page-about .about-flow__year {
  position: relative;
  z-index: 1;
  padding: .12rem .3rem;
  background: var(--bg-deep);
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-about .about-flow__dot {
  position: relative;
  z-index: 1;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(51, 227, 155, .13);
}

.page-about .about-node {
  position: relative;
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  background: linear-gradient(155deg, var(--bg-card) 0%, #101B2D 64%, #0C1526 100%);
  box-shadow: var(--shadow-panel), 7px 7px 0 -1px rgba(38, 51, 77, .4);
  transition: border-left-color var(--t-fast) var(--ease);
}

.page-about .about-node:hover {
  border-left-color: var(--orange);
}

.page-about .about-node__trigger {
  width: 100%;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "stage icon"
    "title icon";
  gap: .3rem 1rem;
  align-items: center;
  padding: clamp(.9rem, 2.2vw, 1.2rem) clamp(1rem, 2.4vw, 1.4rem);
  background: none;
  border: 0;
  color: inherit;
  text-align: left;
  font-family: var(--font-head);
  cursor: pointer;
}

.page-about .about-node__stage {
  grid-area: stage;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .09em;
  color: var(--ink-dim);
}

.page-about .about-node__title {
  grid-area: title;
  font-size: clamp(1rem, 2.2vw, 1.18rem);
  font-weight: 800;
  line-height: 1.38;
  color: var(--ink);
}

.page-about .about-node__icon {
  grid-area: icon;
  position: relative;
  width: 22px;
  height: 22px;
  border: 1px solid var(--line);
  flex: none;
}

.page-about .about-node__icon::before,
.page-about .about-node__icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 10px;
  height: 2px;
  background: var(--cyan);
  transform: translate(-50%, -50%);
  transition: transform var(--t-fast) var(--ease), opacity var(--t-fast) var(--ease);
}

.page-about .about-node__icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.page-about .about-node__trigger[aria-expanded="true"] .about-node__icon::after {
  transform: translate(-50%, -50%) rotate(0deg);
  opacity: 0;
}

.page-about .about-node__panel {
  border-top: 0;
}

.page-about.has-js .page-about .about-node__panel {
  overflow: hidden;
  max-height: 0;
  transition: max-height .34s var(--ease);
}

.page-about .about-node__panel-inner {
  padding: 0 clamp(1rem, 2.4vw, 1.4rem) clamp(1rem, 2.4vw, 1.3rem);
  border-top: 1px dashed rgba(38, 51, 77, .85);
  font-size: .95rem;
  line-height: 1.78;
  color: var(--ink-dim);
}

.page-about .about-node__panel-inner p {
  margin: .9rem 0 0;
}

/* ---------- 团队 ---------- */
.page-about .about-team__banner {
  margin: 0 0 clamp(1.5rem, 3vw, 2.25rem);
  padding: 8px;
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(20, 31, 51, .88), rgba(12, 21, 38, .88));
  box-shadow: var(--about-shadow-step);
}

.page-about .about-team__banner img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-team__caption {
  padding: .65rem .35rem .15rem;
  font-size: .81rem;
  color: var(--ink-dim);
}

.page-about .about-team__filter {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: clamp(1.25rem, 3vw, 1.75rem);
}

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

.page-about .about-group {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  padding: clamp(1rem, 2.4vw, 1.45rem);
  background: linear-gradient(168deg, #121D30 0%, #0E1727 100%);
}

.page-about .about-group__count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .07em;
  color: var(--orange);
}

.page-about .about-group__title {
  margin: 0;
  font-size: 1.12rem;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-group__body {
  margin: 0;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--ink-dim);
}

/* ---------- 本地支持 ---------- */
.page-about .about-local {
  background: linear-gradient(180deg, rgba(12, 21, 38, .85) 0%, var(--bg-deep) 100%);
}

.page-about .about-local__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: center;
}

.page-about .about-local__title {
  margin: .6rem 0 .9rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.4rem, 3.6vw, 2.15rem);
  line-height: 1.25;
  color: var(--ink);
}

.page-about .about-local__text {
  margin: 0;
  font-size: .98rem;
  line-height: 1.82;
  color: var(--ink-dim);
}

.page-about .about-local__list {
  list-style: none;
  margin: 1.1rem 0 1.5rem;
  padding: 0;
  display: grid;
  gap: .65rem;
}

.page-about .about-local__list li {
  position: relative;
  padding-left: 1.5rem;
  font-size: .94rem;
  line-height: 1.72;
  color: var(--ink-dim);
}

.page-about .about-local__list li::before {
  content: "";
  position: absolute;
  left: .3rem;
  top: .72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
}

.page-about .about-local__figure {
  margin: 0;
  padding: 8px;
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(20, 31, 51, .9), rgba(12, 21, 38, .9));
  box-shadow: var(--about-shadow-step);
}

.page-about .about-local__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

/* ---------- 内容生产 ---------- */
.page-about .about-source__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-step {
  display: flex;
  flex-direction: column;
  gap: .55rem;
  padding: clamp(1.1rem, 2.6vw, 1.65rem);
  background: linear-gradient(160deg, #101B2C 0%, #0C1526 100%);
}

.page-about .about-step__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.55rem;
  font-weight: 700;
  line-height: 1;
  color: rgba(40, 228, 217, .38);
}

.page-about .about-step__title {
  margin: 0;
  font-size: 1.08rem;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-step__body {
  margin: 0;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--ink-dim);
}

.page-about .about-source__note {
  display: flex;
  align-items: center;
  gap: .8rem;
  margin-top: clamp(1.1rem, 2.6vw, 1.6rem);
  padding: .95rem 1.15rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--green);
  background: rgba(51, 227, 155, .055);
  font-size: .93rem;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-source__note p {
  margin: 0;
}

.page-about .about-source__note .num {
  font-family: var(--font-mono);
  color: var(--green);
}

/* ---------- 合作与参与 ---------- */
.page-about .about-partners {
  background: linear-gradient(180deg, rgba(12, 21, 38, .8) 0%, var(--bg-deep) 100%);
}

.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: start;
}

.page-about .about-partners__title {
  margin: .6rem 0 .9rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.35rem, 3.4vw, 2rem);
  line-height: 1.28;
  color: var(--ink);
}

.page-about .about-partners__text {
  margin: 0;
  font-size: .97rem;
  line-height: 1.82;
  color: var(--ink-dim);
}

.page-about .about-partners__links {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  margin-top: 1.25rem;
}

.page-about .about-partners__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .75rem;
}

.page-about .about-partners__list li {
  padding: .95rem 1.15rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan-deep);
  background: rgba(20, 31, 51, .62);
  font-size: .93rem;
  line-height: 1.75;
  color: var(--ink-dim);
}

/* ---------- 资质与备案 ---------- */
.page-about .about-credential__card {
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
  padding: clamp(1.35rem, 3.6vw, 2.6rem);
  border: 1px solid var(--line);
  background: linear-gradient(135deg, #101B2C 0%, #0C1526 56%, #121D30 100%);
  box-shadow: var(--shadow-panel);
}

.page-about .about-credential__card::before {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: min(52%, 440px);
  height: 100%;
  background: linear-gradient(120deg, transparent 28%, rgba(40, 228, 217, .13) 100%);
  clip-path: polygon(20% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-credential__title {
  position: relative;
  margin: .6rem 0 1.1rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.3rem, 3.2vw, 1.95rem);
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-credential__meta {
  position: relative;
  margin: 0;
  display: grid;
  gap: .1rem;
}

.page-about .about-credential__meta > div {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: .7rem 0;
  border-bottom: 1px solid rgba(38, 51, 77, .7);
}

.page-about .about-credential__meta dt {
  font-size: .87rem;
  color: var(--ink-dim);
}

.page-about .about-credential__meta dd {
  margin: 0;
  font-size: .92rem;
  font-weight: 700;
  text-align: right;
  color: var(--ink);
}

.page-about .about-credential__meta dd.num {
  font-family: var(--font-mono);
  color: var(--cyan);
}

.page-about .about-credential__contact {
  position: relative;
  z-index: 1;
  display: grid;
  gap: .7rem;
  align-content: start;
}

.page-about .about-credential__label {
  margin: 0;
  font-size: .78rem;
  letter-spacing: .1em;
  color: var(--ink-dim);
}

.page-about .about-credential__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55rem;
  padding: .8rem 1rem;
  border: 1px solid var(--line);
  background: rgba(6, 10, 20, .58);
}

.page-about .about-credential__key {
  flex: none;
  min-width: 4.5rem;
  font-size: .78rem;
  color: var(--ink-dim);
}

.page-about .about-credential__value {
  flex: 1 1 auto;
  min-width: 0;
  font-family: var(--font-mono);
  font-size: .89rem;
  color: var(--ink);
  overflow-wrap: anywhere;
}

.page-about .about-credential__value--text {
  font-family: var(--font-body);
  font-size: .9rem;
}

.page-about .copy-btn {
  flex: none;
  padding: .32rem .7rem;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--cyan);
  font: inherit;
  font-size: .76rem;
  cursor: pointer;
  transition: border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.page-about .copy-btn:hover {
  border-color: var(--cyan);
  background: rgba(40, 228, 217, .08);
}

.page-about .copy-btn.is-done {
  border-color: var(--green);
  color: var(--green);
}

.page-about .about-credential__note {
  margin: 0;
  font-size: .8rem;
  line-height: 1.7;
  color: var(--ink-dim);
}

.page-about .about-credential__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  margin-top: .35rem;
}

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

  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-source__steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }

  .page-about .about-credential__card {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-timeline__layout {
    grid-template-columns: minmax(0, 32%) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4.5rem);
  }

  .page-about .about-rail {
    position: sticky;
    top: var(--about-rail-top);
  }

  .page-about .about-local__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: clamp(2rem, 5vw, 4.5rem);
  }
}

@media (min-width: 1024px) {
  .page-about .about-team__groups {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .page-about .about-flow__node {
    grid-template-columns: 2.4rem minmax(0, 1fr);
  }

  .page-about .about-flow__year {
    font-size: .68rem;
    letter-spacing: 0;
  }

  .page-about .about-node__trigger {
    gap: .25rem .6rem;
  }

  .page-about .about-credential__meta > div {
    flex-direction: column;
    gap: .2rem;
  }

  .page-about .about-credential__meta dd {
    text-align: left;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-rail__item,
  .page-about .copy-btn,
  .page-about .about-node__icon::before,
  .page-about .about-node__icon::after {
    transition: none;
  }

  .page-about.has-js .page-about .about-node__panel {
    transition: none;
  }
}