.page-about {
  --about-paper-edge: 1px solid var(--ink-900);
  --about-line-soft: 1px solid var(--line);
  padding-bottom: clamp(2rem, 6vw, 4rem);
  color: var(--white);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .breadcrumbs {
  margin: 0 0 clamp(1rem, 3vw, 1.8rem);
}

.page-about h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.1rem, 7vw, 4.2rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0.5rem 0 1rem;
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 4.2vw, 2.7rem);
  line-height: 1.14;
  letter-spacing: -0.01em;
  margin: 0.4rem 0 0.7rem;
}

/* ---------- 刊头 ---------- */
.page-about .about-mast {
  padding: 0 0 clamp(2rem, 5vw, 3.6rem);
}

.page-about .about-mast__grid {
  display: grid;
  gap: clamp(1.4rem, 4vw, 3rem);
}

.page-about .about-mast__lead {
  color: var(--white);
  max-width: 40ch;
}

.page-about .about-mast__body {
  color: var(--mist);
  max-width: 42ch;
  margin: 0.9rem 0 0;
  line-height: 1.8;
}

.page-about .about-mast__meta {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1.8rem;
  margin: 1.6rem 0 0;
  padding: 1rem 0 0;
  border-top: var(--about-line-soft);
}

.page-about .about-mast__meta li {
  display: flex;
  align-items: baseline;
  gap: 0.45rem;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-mast__meta .num {
  font-size: 1.45rem;
  color: var(--amber);
}

.page-about .about-mast__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin: 1.5rem 0 0;
}

.page-about .about-mast__figure {
  position: relative;
  margin: 0;
  padding: 0.6rem;
  border: var(--about-line-soft);
  background: var(--ink-800);
}

.page-about .about-mast__figure::before,
.page-about .about-mast__figure::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  border: 2px solid var(--cyan);
  pointer-events: none;
}

.page-about .about-mast__figure::before {
  top: -2px;
  left: -2px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-mast__figure::after {
  bottom: -2px;
  right: -2px;
  border-left: 0;
  border-top: 0;
}

.page-about .about-mast__figure img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--ink-700);
}

.page-about .about-mast__figure figcaption {
  padding: 0.65rem 0.2rem 0.15rem;
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  color: var(--mist);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  display: grid;
  gap: 0.55rem;
  padding: 0.9rem 0;
  margin: 0 0 clamp(1rem, 3vw, 1.6rem);
  border-block: var(--about-line-soft);
}

.page-about .about-index__cap {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.page-about .about-index__list {
  list-style: none;
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0 0 0.25rem;
  overflow-x: auto;
}

.page-about .about-index__list li {
  flex: 0 0 auto;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.42rem 0.7rem;
  border: var(--about-line-soft);
  color: var(--mist);
  font-size: 0.8rem;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-index__list a[data-active] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-900);
}

.page-about .about-index__list a[data-active] .num {
  color: var(--ink-900);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  padding-block: clamp(2.2rem, 5.5vw, 4rem);
  border-top: var(--about-line-soft);
}

.page-about .about-sec__head {
  max-width: 58ch;
  margin-bottom: clamp(1.4rem, 4vw, 2.4rem);
}

.page-about .about-sec__lead {
  color: var(--mist);
  margin: 0;
  max-width: 44ch;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--violet) 42%, var(--magenta) 72%, var(--amber));
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 2.4rem;
  padding-bottom: 1.8rem;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 0.5rem;
  width: 14px;
  height: 14px;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  transform: rotate(45deg);
}

.page-about .about-timeline__item--figure {
  padding-left: 0;
  padding-bottom: 2rem;
}

.page-about .about-timeline__item--figure::before {
  display: none;
}

.page-about .about-timeline__year {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  color: var(--amber);
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
}

.page-about .about-timeline__no {
  font-size: 0.7rem;
  color: var(--cyan);
  opacity: 0.85;
}

.page-about .about-timeline__card {
  position: relative;
  padding: 1rem 1.1rem 1.15rem;
  background: var(--ink-800);
  border: var(--about-line-soft);
  border-left: 2px solid var(--cyan);
}

.page-about .about-timeline__item:nth-child(2) .about-timeline__card {
  border-left-color: var(--violet);
}

.page-about .about-timeline__item:nth-child(3) .about-timeline__card {
  border-left-color: var(--magenta);
}

.page-about .about-timeline__item:nth-child(5) .about-timeline__card {
  border-left-color: var(--amber);
}

.page-about .about-timeline__item:nth-child(6) .about-timeline__card {
  border-left-color: var(--magenta-soft);
}

.page-about .about-timeline__item:nth-child(7) .about-timeline__card {
  border-left-color: var(--green);
}

.page-about .about-timeline__card h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  line-height: 1.35;
  margin: 0 0 0.45rem;
}

.page-about .about-timeline__card p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-timeline__figure {
  margin: 0;
  padding: 0.5rem;
  border: var(--about-line-soft);
  background: var(--ink-800);
}

.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  background: var(--ink-700);
}

.page-about .about-timeline__figure figcaption {
  padding: 0.6rem 0.2rem 0.1rem;
  font-size: 0.74rem;
  letter-spacing: 0.03em;
  color: var(--mist);
}

/* ---------- 服务谁 ---------- */
.page-about .about-who__grid {
  display: grid;
  gap: 1rem;
}

.page-about .about-who__card {
  padding: 1.2rem 1.1rem 1.3rem;
  background: var(--ink-800);
  border: var(--about-line-soft);
  border-top: 2px solid var(--cyan);
}

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

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

.page-about .about-who__card .eyebrow {
  color: var(--mist);
  margin: 0 0 0.5rem;
}

.page-about .about-who__card h3 {
  font-family: var(--font-display);
  font-size: 1.08rem;
  line-height: 1.35;
  margin: 0 0 0.5rem;
}

.page-about .about-who__card p {
  margin: 0 0 0.9rem;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-who__link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan);
  padding-bottom: 0.15rem;
}

.page-about .about-who__link:hover,
.page-about .about-who__link:focus-visible {
  color: var(--white);
  border-bottom-color: var(--white);
}

/* ---------- 认证保障 ---------- */
.page-about .about-trust__grid {
  display: grid;
  gap: 1.6rem;
}

.page-about .about-trust__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-trust__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.85rem;
  padding-bottom: 1rem;
  border-bottom: var(--about-line-soft);
}

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

.page-about .about-trust__item .num {
  font-size: 1rem;
  color: var(--amber);
  padding-top: 0.2rem;
}

.page-about .about-trust__item h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  line-height: 1.4;
  margin: 0 0 0.35rem;
}

.page-about .about-trust__item p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-note {
  position: relative;
  padding: 1.15rem 1.1rem 1.25rem;
  background: var(--paper);
  color: var(--ink-900);
  border: var(--about-paper-edge);
  box-shadow: 6px 6px 0 rgba(0, 229, 255, 0.16);
}

.page-about .about-note h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  margin: 0 0 0.55rem;
  color: var(--ink-900);
  letter-spacing: 0.02em;
}

.page-about .about-note p {
  margin: 0 0 0.6rem;
  font-size: 0.84rem;
  line-height: 1.72;
  color: var(--ink-900);
}

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

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 1.6rem;
}

.page-about .about-team__text p {
  margin: 0 0 0.85rem;
  color: var(--mist);
  line-height: 1.82;
  font-size: 0.94rem;
}

.page-about .about-team__nums {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.7rem;
  margin: 1.3rem 0 0;
  padding: 0;
}

.page-about .about-team__nums li {
  padding-top: 0.6rem;
  border-top: 2px solid var(--line);
}

.page-about .about-team__nums .num {
  display: block;
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-team__label {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.75rem;
  letter-spacing: 0.07em;
  color: var(--mist);
}

.page-about .about-team__figure {
  margin: 0;
  padding: 0.5rem;
  border: var(--about-line-soft);
  background: var(--ink-800);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  background: var(--ink-700);
}

.page-about .about-team__figure figcaption {
  padding: 0.6rem 0.2rem 0.1rem;
  font-size: 0.74rem;
  letter-spacing: 0.03em;
  color: var(--mist);
}

/* ---------- 本地 ---------- */
.page-about .about-local {
  display: grid;
  gap: 1.4rem;
  padding: clamp(1.3rem, 4vw, 2.2rem);
  border: var(--about-line-soft);
  border-left: 3px solid var(--magenta);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(255, 45, 149, 0.14), transparent 55%),
    radial-gradient(120% 140% at 0% 100%, rgba(0, 229, 255, 0.12), transparent 55%),
    var(--ink-800);
}

.page-about .about-local__text p {
  margin: 0.8rem 0 0;
  font-size: 0.93rem;
  line-height: 1.82;
  color: var(--mist);
}

.page-about .about-local__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
  align-content: start;
}

.page-about .about-local__links a {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.6rem 0.7rem;
  border: var(--about-line-soft);
  background: rgba(5, 6, 10, 0.55);
  color: var(--white);
  font-size: 0.86rem;
  text-decoration: none;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .about-local__links a:hover,
.page-about .about-local__links a:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .about-local__links .num {
  color: var(--amber);
  font-size: 0.78rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-mast__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: end;
  }

  .page-about .about-who__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.1rem;
    align-items: start;
  }

  .page-about .about-who__card:nth-child(2) {
    margin-top: 2.2rem;
  }

  .page-about .about-who__card:nth-child(3) {
    margin-top: 0.9rem;
  }

  .page-about .about-local {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.9fr);
    align-items: start;
  }
}

@media (min-width: 880px) {
  .page-about .about-timeline::before {
    left: 7.05rem;
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 7rem minmax(0, 1fr);
    gap: 2rem;
    padding-left: 0;
    padding-bottom: 1.9rem;
  }

  .page-about .about-timeline__item::before {
    left: calc(7.05rem - 6px);
    top: 0.45rem;
  }

  .page-about .about-timeline__item--figure {
    grid-column: 1 / -1;
    padding-bottom: 2.2rem;
  }

  .page-about .about-timeline__year {
    justify-content: flex-end;
    margin: 0;
    padding-top: 0.35rem;
    flex-direction: row-reverse;
  }

  .page-about .about-trust__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.85fr);
    gap: 2rem;
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 2rem;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__list a,
  .page-about .about-who__link,
  .page-about .about-local__links a {
    transition: none;
  }
}