/* ===== 我们是谁 / page-about ===== */
.page-about {
  --about-line: rgba(207, 251, 240, 0.18);
  --about-line-ink: rgba(10, 12, 11, 0.12);
  --about-muted: rgba(207, 251, 240, 0.74);
  background: var(--deep);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  font-weight: 200;
  letter-spacing: -0.015em;
  margin: 0;
}

.page-about p {
  margin: 0 0 1.1em;
  line-height: 1.75;
}

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

.page-about .about-idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.4;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gauge);
}

.page-about .about-head {
  max-width: 48rem;
  margin-bottom: 2.5rem;
}

.page-about .about-head__title {
  margin-top: 0.9rem;
  font-size: clamp(1.55rem, 4.4vw, 2.75rem);
  line-height: 1.14;
}

.page-about .about-head__note {
  margin-top: 1.1rem;
  max-width: 42rem;
  color: var(--about-muted);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 2.75rem) 0 3.25rem;
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(42, 42, 110, 0.55) 0%, rgba(42, 42, 110, 0) 58%),
    radial-gradient(85% 75% at 0% 100%, rgba(122, 31, 61, 0.4) 0%, rgba(122, 31, 61, 0) 62%),
    var(--deep);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: 2rem;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

.page-about .about-hero__title {
  margin: 1rem 0 0;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(2rem, 7.2vw, 4.4rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  max-width: 17ch;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin-top: 1.4rem;
  max-width: 40rem;
  font-size: 1rem;
  color: var(--about-muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.9rem;
}

.page-about .about-hero__aside {
  border: 1px solid var(--about-line);
  background: rgba(11, 58, 49, 0.6);
}

.page-about .about-hero__stat {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 1.2rem;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero__label {
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--about-muted);
}

.page-about .about-hero__figure {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4.4vw, 2.2rem);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-hero__unit {
  margin-left: 0.3em;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--paper);
}

.page-about .about-hero__foot {
  margin: 0;
  padding: 1rem 1.2rem;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--gauge);
}

/* ---------- 章节跳转条 ---------- */
.page-about .about-jump {
  background: var(--board);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-jump__list {
  display: flex;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-jump__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-jump__item {
  flex: 0 0 auto;
}

.page-about .about-jump__link {
  display: block;
  padding: 0.95rem 1.1rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mint);
  text-decoration: none;
  border-right: 1px solid var(--about-line);
  transition: color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .about-jump__link:hover,
.page-about .about-jump__link:focus-visible {
  color: var(--deep);
  background: var(--cyan);
}

/* ---------- 时间纵深 ---------- */
.page-about .about-timeline {
  position: relative;
  padding: 4rem 0;
  background:
    linear-gradient(168deg, rgba(6, 35, 30, 0) 0 55%, rgba(6, 35, 30, 0.82) 55.2% 100%),
    var(--archive);
}

.page-about .about-timeline__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line);
}

.page-about .about-timeline__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-timeline__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 3.4vw, 1.75rem);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-timeline__name {
  font-size: clamp(1.05rem, 2.4vw, 1.35rem);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-timeline__body p {
  margin: 0.7rem 0 0;
  max-width: 46rem;
  font-size: 0.94rem;
  color: var(--about-muted);
}

/* ---------- 团队分工 ---------- */
.page-about .about-team {
  padding: 4rem 0;
  background: var(--deep);
}

.page-about .about-tree {
  position: relative;
}

.page-about .about-tree::before {
  content: "";
  position: absolute;
  left: calc(1.5rem + 4px);
  top: 1.6rem;
  bottom: 1.6rem;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(255, 176, 58, 0.7), var(--heritage));
  opacity: 0.5;
}

.page-about .about-tree__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tree__item {
  position: relative;
  padding: 0 0 1.1rem 3.25rem;
}

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

.page-about .about-tree__item::before {
  content: "";
  position: absolute;
  left: calc(1.5rem - 4px);
  top: 1.6rem;
  width: 9px;
  height: 9px;
  background: var(--cyan);
  transform: rotate(45deg);
  box-shadow: 0 0 0 4px rgba(53, 242, 192, 0.14);
}

.page-about .about-tree__body {
  padding: 1.1rem 1.2rem 1.25rem;
  border: 1px solid var(--about-line);
  background: rgba(11, 58, 49, 0.6);
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .about-tree__item:hover .about-tree__body,
.page-about .about-tree__item:focus-within .about-tree__body {
  background: rgba(15, 71, 64, 0.94);
  border-color: rgba(53, 242, 192, 0.45);
}

.page-about .about-tree__code {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--corner);
}

.page-about .about-tree__name {
  margin-top: 0.5rem;
  font-size: clamp(1.1rem, 2.6vw, 1.4rem);
  line-height: 1.25;
  color: var(--paper);
}

.page-about .about-tree__text {
  margin: 0.7rem 0 0;
  font-size: 0.94rem;
  color: var(--about-muted);
}

.page-about .about-tree__out {
  margin: 0.85rem 0 0;
  padding-top: 0.7rem;
  border-top: 1px dashed var(--about-line);
  font-size: 0.84rem;
  letter-spacing: 0.02em;
  color: var(--mint);
}

.page-about .about-team__figure {
  margin: 2.75rem 0 0;
}

.page-about .figure__media {
  overflow: hidden;
  border: 1px solid var(--about-line);
}

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

.page-about .figure__caption {
  margin-top: 0.7rem;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--gauge);
}

/* ---------- 档案数字化 ---------- */
.page-about .about-archive {
  padding: 4rem 0;
  background: linear-gradient(118deg, #651733 0 50%, var(--heritage) 50.2% 100%);
}

.page-about .about-archive__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.25rem;
}

.page-about .about-archive__lede {
  margin-top: 1.2rem;
  max-width: 44rem;
  color: rgba(255, 240, 244, 0.84);
}

.page-about .about-archive__steps {
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(255, 224, 232, 0.24);
}

.page-about .about-archive__step {
  display: flex;
  gap: 0.9rem;
  align-items: baseline;
  padding: 0.85rem 0;
  border-bottom: 1px solid rgba(255, 224, 232, 0.24);
  font-size: 0.92rem;
  color: rgba(255, 240, 244, 0.86);
}

.page-about .about-archive__step-no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--corner);
}

.page-about .about-archive__stat {
  margin-top: 1.6rem;
  font-size: 0.94rem;
  color: rgba(255, 240, 244, 0.86);
}

.page-about .about-archive__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4.4vw, 2.1rem);
  color: var(--paper);
  margin-right: 0.35rem;
}

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

/* ---------- 指标来源 ---------- */
.page-about .about-standards {
  padding: 4rem 0;
  background: var(--board);
}

.page-about .about-standards__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-about .about-metric {
  padding: 1.25rem 1.25rem 1.35rem;
  border: 1px solid var(--about-line);
  border-top: 3px solid var(--corner);
  background: rgba(6, 35, 30, 0.62);
}

.page-about .about-metric__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-metric__text {
  margin: 0.8rem 0 0;
  font-size: 0.92rem;
  color: var(--about-muted);
}

.page-about .about-standards__link {
  margin-top: 1.75rem;
  font-size: 0.9rem;
  color: var(--about-muted);
}

/* ---------- 服务对象 ---------- */
.page-about .about-clients {
  padding: 4rem 0;
}

.page-about .about-head--paper .about-head__title {
  color: var(--ink);
}

.page-about .about-head--paper .about-head__note {
  color: rgba(10, 12, 11, 0.72);
}

.page-about .about-idx--paper {
  color: rgba(10, 12, 11, 0.55);
}

.page-about .about-clients__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-line-ink);
  border: 1px solid var(--about-line-ink);
}

.page-about .about-client {
  padding: 1.3rem 1.25rem 1.45rem;
  background: var(--paper);
}

.page-about .about-client__name {
  font-size: clamp(1rem, 2.4vw, 1.22rem);
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-client__text {
  margin: 0.7rem 0 0;
  font-size: 0.92rem;
  color: rgba(10, 12, 11, 0.76);
}

.page-about .about-client__text a,
.page-about .about-clients__note a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--cyan);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.page-about .about-clients__strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 2.25rem;
  background: var(--about-line-ink);
  border: 1px solid var(--about-line-ink);
}

.page-about .about-clients__cell {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.1rem 1rem;
  background: var(--paper);
}

.page-about .about-clients__num {
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 3.2vw, 1.6rem);
  line-height: 1;
  color: var(--heritage);
}

.page-about .about-clients__cap {
  font-size: 0.78rem;
  line-height: 1.55;
  color: rgba(10, 12, 11, 0.68);
}

.page-about .about-clients__note {
  margin-top: 1.75rem;
  font-size: 0.9rem;
  color: rgba(10, 12, 11, 0.76);
}

/* ---------- 资质与认可 ---------- */
.page-about .about-honors {
  padding: 4rem 0 4.5rem;
  background: var(--deep);
}

.page-about .about-honors__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.25rem;
}

.page-about .about-honors__list {
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line);
}

.page-about .about-honors__item {
  display: flex;
  gap: 1rem;
  align-items: baseline;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--about-line);
  font-size: 0.94rem;
  color: var(--paper);
}

.page-about .about-honors__no {
  flex: 0 0 auto;
  width: 1.4rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--corner);
}

.page-about .about-honors__close {
  margin-top: 1.6rem;
  max-width: 44rem;
  font-size: 0.94rem;
  color: var(--about-muted);
}

.page-about .about-honors__cta {
  margin-top: 1.75rem;
}

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 4.5rem) 0 5rem;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 3.5rem;
    align-items: end;
  }

  .page-about .about-timeline__item {
    grid-template-columns: 8.5rem minmax(0, 1fr);
    gap: 1.5rem;
    align-items: baseline;
  }

  .page-about .about-archive__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
    gap: 3rem;
    align-items: center;
  }

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

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

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

  .page-about .about-honors__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.85fr);
    gap: 3.25rem;
    align-items: start;
  }
}

@media (min-width: 1180px) {
  .page-about .about-timeline,
  .page-about .about-team,
  .page-about .about-archive,
  .page-about .about-standards,
  .page-about .about-clients,
  .page-about .about-honors {
    padding-top: 5.5rem;
    padding-bottom: 5.5rem;
  }

  .page-about .about-hero__title {
    max-width: 15ch;
  }
}
</main>