.page-about {
  --about-tl-line: rgba(23, 69, 58, .95);
  --about-glow: rgba(53, 242, 200, .5);
  display: block;
  overflow-wrap: break-word;
}

/* ---------- 区块标题组 ---------- */
.page-about .section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px 40px;
  margin-bottom: clamp(24px, 3.5vw, 44px);
}

.page-about .section-head__left {
  max-width: 46ch;
}

.page-about .section-head__note {
  max-width: 42ch;
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.9;
}

.page-about .eyebrow {
  display: inline-block;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--signal);
}

.page-about .section-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(23px, 3.4vw, 40px);
  font-weight: 900;
  line-height: 1.24;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .prose {
  max-width: 46ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.95;
  color: var(--muted);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(14px, 2.2vw, 28px);
  padding-bottom: clamp(36px, 5vw, 72px);
}

.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 clamp(18px, 2.6vw, 32px);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
}

.page-about .breadcrumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

.page-about .breadcrumbs a:hover {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

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

.page-about .about-hero__frame {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
  padding: clamp(22px, 3.4vw, 48px);
  border: 1px solid var(--line);
  background: linear-gradient(158deg, rgba(14, 42, 34, .92) 0%, rgba(7, 19, 15, .74) 58%, rgba(7, 19, 15, .92) 100%);
  overflow: hidden;
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, var(--grid-line) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(0deg, var(--grid-line) 0 1px, transparent 1px 64px);
  opacity: .32;
  pointer-events: none;
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 128px;
  height: 2px;
  background: var(--signal);
}

.page-about .about-hero__main {
  position: relative;
  min-width: 0;
}

.page-about .about-hero__main h1 {
  margin: 0 0 clamp(16px, 2vw, 24px);
  font-family: var(--font-head);
  font-size: clamp(32px, 6vw, 76px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -.03em;
  color: var(--paper);
}

.page-about .about-hero__main .lede {
  max-width: 46ch;
  margin: 0;
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.9;
  color: var(--paper);
  opacity: .86;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-hero__facts {
  position: relative;
  display: grid;
  gap: 0;
  margin: 0;
  align-content: start;
  min-width: 0;
}

.page-about .about-hero__facts > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__facts > div:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__facts dt {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
}

.page-about .about-hero__facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.2vw, 26px);
  color: var(--signal);
  white-space: nowrap;
}

/* ---------- 媒体容器与说明 ---------- */
.page-about .media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--block);
}

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

.page-about .media-frame--4x3 { aspect-ratio: 4 / 3; }
.page-about .media-frame--16x9 { aspect-ratio: 16 / 9; }
.page-about .media-frame--1x1 { aspect-ratio: 1 / 1; }

.page-about .media-frame__caption {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 团队与岗位 ---------- */
.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-bottom: clamp(18px, 2.6vw, 28px);
}

.page-about .filter-btn {
  font-family: inherit;
  font-size: 13px;
  letter-spacing: .06em;
  padding: 9px 16px;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--line);
  cursor: pointer;
  transition: color .16s var(--ease), border-color .16s var(--ease), background-color .16s var(--ease);
}

.page-about .filter-btn:hover {
  color: var(--paper);
  border-color: var(--stroke);
}

.page-about .filter-btn:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

.page-about .filter-btn[aria-pressed="true"] {
  color: var(--ink);
  background: var(--signal);
  border-color: var(--signal);
  font-weight: 700;
}

.page-about .filter-count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.6vw, 40px);
}

.page-about .about-team__grid > * {
  min-width: 0;
}

.page-about .about-team__aside {
  display: grid;
  gap: clamp(18px, 2.4vw, 26px);
  align-content: start;
}

.page-about .about-ring {
  margin: 0;
  padding: 20px 18px;
  border: 1px solid var(--line);
  background: var(--block);
}

.page-about .about-ring svg {
  display: block;
  width: 100%;
  max-width: 250px;
  height: auto;
  margin: 0 auto;
}

.page-about .about-ring figcaption {
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--muted);
  text-align: center;
}

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

.page-about .about-jobs {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-job {
  padding: clamp(20px, 2.6vw, 30px);
  border: 1px solid var(--line);
  border-left: 2px solid var(--line);
  background: var(--block);
  transition: border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-job:hover {
  background: var(--zebra);
  border-left-color: var(--signal);
}

.page-about .about-job.is-in {
  animation: about-fade .16s var(--ease) both;
}

@keyframes about-fade {
  from { opacity: 0; }
  to { opacity: 1; }
}

.page-about .about-job__headcount {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--signal);
}

.page-about .about-job__headcount .num {
  font-size: 26px;
  line-height: 1;
}

.page-about .about-job__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: clamp(18px, 1.7vw, 22px);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-job__text {
  max-width: 54ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--muted);
}

.page-about .about-job__shift {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--signal-soft);
}

/* ---------- 登记流程 ---------- */
.page-about .about-flow__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  border: 1px solid var(--line);
}

.page-about .about-flow__steps li {
  padding: clamp(20px, 2.6vw, 30px);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(14, 42, 34, .85), rgba(7, 19, 15, .55));
}

.page-about .about-flow__steps li:last-child {
  border-bottom: 0;
}

.page-about .about-flow__idx {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .2em;
  color: var(--alert);
}

.page-about .about-flow__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: clamp(17px, 1.5vw, 20px);
  font-weight: 800;
  color: var(--paper);
  letter-spacing: -.01em;
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--muted);
}

/* ---------- 发展历程时间轴 ---------- */
.page-about .about-history__banner {
  margin: 0 0 clamp(30px, 4.6vw, 60px);
}

.page-about .about-tl {
  position: relative;
  padding-top: 4px;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 12px;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--about-tl-line) 6%, var(--about-tl-line) 94%, transparent);
}

.page-about .tl-node {
  position: relative;
  padding-left: 48px;
  padding-bottom: clamp(20px, 3vw, 34px);
}

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

.page-about .tl-node::after {
  content: "";
  position: absolute;
  left: 7px;
  top: 7px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--stroke);
  background: var(--ink);
  transform: rotate(45deg);
  transition: border-color .3s var(--ease), background-color .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .tl-node.is-revealed::after {
  border-color: var(--signal);
  background: var(--signal);
  box-shadow: 0 0 12px var(--about-glow);
}

.page-about .tl-node__year {
  position: absolute;
  left: 0;
  top: 2px;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--signal);
  opacity: .7;
}

.page-about .tl-card {
  border: 1px solid var(--line);
  background: var(--block);
  padding: clamp(16px, 2vw, 22px);
  transition: border-color .2s var(--ease);
}

.page-about .tl-card:hover {
  border-color: var(--stroke);
}

.page-about .tl-card[open] {
  border-color: rgba(53, 242, 200, .55);
}

.page-about .tl-card > summary {
  list-style: none;
  cursor: pointer;
  position: relative;
  display: block;
  padding-right: 62px;
}

.page-about .tl-card > summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-card > summary::after {
  content: "展开";
  position: absolute;
  top: 3px;
  right: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--signal);
  border-bottom: 1px solid rgba(53, 242, 200, .4);
}

.page-about .tl-card[open] > summary::after {
  content: "收起";
}

.page-about .tl-card > summary:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
}

.page-about .tl-card__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(17px, 1.6vw, 21px);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .tl-card__lead {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .tl-card__more {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-about .tl-card__more p {
  margin: 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--paper);
  opacity: .82;
}

/* ---------- 勘误流程 ---------- */
.page-about .about-fix__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  border: 1px solid var(--line);
}

.page-about .about-fix__steps li {
  padding: clamp(18px, 2.4vw, 26px);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(14, 42, 34, .7), rgba(7, 19, 15, .45));
}

.page-about .about-fix__steps li:last-child {
  border-bottom: 0;
}

.page-about .about-fix__idx {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--signal-soft);
}

.page-about .about-fix__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: clamp(16px, 1.4vw, 19px);
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-fix__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--muted);
  word-break: break-word;
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  align-items: center;
}

.page-about .about-partners__grid > * {
  min-width: 0;
}

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

.page-about .about-partners__list {
  list-style: none;
  margin: clamp(18px, 2.4vw, 26px) 0 clamp(22px, 3vw, 30px);
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-partners__list li {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-partners__list strong {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .14em;
  color: var(--signal);
}

.page-about .about-partners__list span {
  font-size: 14px;
  line-height: 1.9;
  color: var(--muted);
}

/* ---------- 选择理由 ---------- */
.page-about .about-why__grid {
  display: grid;
  grid-template-columns: 1fr;
  border: 1px solid var(--line);
}

.page-about .about-why__item {
  display: flex;
  flex-direction: column;
  padding: clamp(22px, 3vw, 34px);
  border-bottom: 1px solid var(--line);
  background: var(--block);
  transition: background-color .2s var(--ease);
}

.page-about .about-why__item:last-child {
  border-bottom: 0;
}

.page-about .about-why__item:hover {
  background: var(--zebra);
}

.page-about .about-why__idx {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--alert);
}

.page-about .about-why__item h3 {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: clamp(18px, 1.7vw, 22px);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-why__item p {
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--muted);
}

.page-about .about-why__item a {
  margin-top: auto;
  align-self: flex-start;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--signal);
  text-decoration: none;
  padding-bottom: 3px;
  border-bottom: 1px solid rgba(53, 242, 200, .4);
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

.page-about .about-why__item a::after {
  content: " →";
}

.page-about .about-why__item a:hover {
  color: var(--signal-soft);
  border-bottom-color: var(--signal-soft);
}

.page-about .about-why__item a:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .about-partners__list li {
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }
}

@media (min-width: 780px) {
  .page-about .about-flow__steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-flow__steps li {
    border-bottom: 0;
    border-right: 1px solid var(--line);
  }

  .page-about .about-flow__steps li:last-child {
    border-right: 0;
  }
}

@media (min-width: 860px) {
  .page-about .about-fix__steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-fix__steps li {
    border-bottom: 0;
    border-right: 1px solid var(--line);
  }

  .page-about .about-fix__steps li:last-child {
    border-right: 0;
  }

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

  .page-about .about-why__item {
    border-bottom: 0;
    border-right: 1px solid var(--line);
  }

  .page-about .about-why__item:last-child {
    border-right: 0;
  }
}

@media (min-width: 880px) {
  .page-about .about-hero__frame {
    grid-template-columns: minmax(0, 1.62fr) minmax(238px, .78fr);
    align-items: center;
    padding: clamp(32px, 4vw, 56px);
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 360px) minmax(0, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 296px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-tl::before {
    left: 50%;
  }

  .page-about .tl-node {
    width: 50%;
    padding-left: 0;
    padding-right: 76px;
    padding-bottom: clamp(28px, 4vw, 58px);
  }

  .page-about .tl-node--right {
    margin-left: 50%;
    padding-right: 0;
    padding-left: 76px;
  }

  .page-about .tl-node--left .tl-node__year {
    left: auto;
    right: -7px;
  }

  .page-about .tl-node--right .tl-node__year {
    left: -7px;
  }

  .page-about .tl-node--left::after {
    left: auto;
    right: -6px;
  }

  .page-about .tl-node--right::after {
    left: -6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-job.is-in {
    animation: none;
  }

  .page-about .tl-node::after,
  .page-about .about-job,
  .page-about .tl-card,
  .page-about .filter-btn,
  .page-about .about-why__item {
    transition-duration: .01ms;
  }
}