.page-about {
  --about-inner-w: 1160px;
  background: var(--ink);
  color: var(--paper);
  overflow-x: hidden;
  line-height: 1.6;
}

/* ===== Hero ===== */
.page-about .about-hero {
  position: relative;
  padding: 2rem 1.25rem 3.25rem;
  background:
    linear-gradient(120deg, var(--purple) 0%, transparent 52%),
    linear-gradient(210deg, transparent 72%, var(--red) 132%),
    var(--ink);
  border-bottom: 1px solid var(--border);
}

.page-about .about-hero__inner {
  max-width: var(--max-w);
  margin-inline: auto;
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: 1.75rem;
}

.page-about .about-hero__kicker {
  color: var(--cyan);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  margin-bottom: 0.5rem;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 1.75rem;
}

.page-about .about-hero__title {
  margin: 0.25rem 0 0.5rem;
  font-size: clamp(3rem, 11vw, 6rem);
  line-height: 0.95;
  color: var(--paper);
}

.page-about .about-hero__subtitle {
  margin: 0 0 1rem;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--pink);
  letter-spacing: 0.02em;
}

.page-about .about-hero__desc {
  max-width: 44rem;
  margin: 0;
  font-size: 1rem;
  color: rgba(245, 240, 230, 0.88);
}

.page-about .about-hero__visual {
  position: relative;
  margin: 0;
}

.page-about .about-hero__visual img {
  width: 100%;
  height: auto;
  display: block;
  clip-path: polygon(0 6%, 100% 0%, 99% 94%, 0 100%);
  outline: 1px solid var(--pink);
  outline-offset: -0.75rem;
  filter: contrast(1.05) saturate(1.15);
}

.page-about .about-hero__visual-tag {
  position: absolute;
  right: 1.25rem;
  top: 1.25rem;
  background: var(--pink);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  padding: 0.25rem 0.75rem;
  transform: rotate(3deg);
  clip-path: polygon(0 0, 94% 0, 100% 50%, 94% 100%, 0 100%);
}

/* ===== 我们是谁 ===== */
.page-about .about-intro {
  position: relative;
  padding: 3rem 1.25rem 3.75rem;
  background:
    linear-gradient(135deg, var(--purple-deep) 0%, var(--ink) 62%);
  border-bottom: 1px solid var(--border);
}

.page-about .about-intro__inner {
  max-width: var(--max-w);
  margin-inline: auto;
  display: grid;
  gap: 2rem;
}

.page-about .about-intro__copy h2,
.page-about .about-timeline__head h2,
.page-about .about-data__head h2,
.page-about .about-team__head h2,
.page-about .about-compliance__intro h2,
.page-about .about-vision h2,
.page-about .about-end h2 {
  margin: 0.35rem 0 0.75rem;
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.05;
  color: var(--paper);
  letter-spacing: 0.02em;
}

.page-about .about-intro__copy p,
.page-about .about-data__head p,
.page-about .about-vision__lead,
.page-about .about-end__body > p:last-of-type {
  max-width: 50rem;
  margin: 0.75rem 0;
  color: rgba(245, 240, 230, 0.86);
}

.page-about .about-intro__anchor {
  display: inline-block;
  margin-top: 1.5rem;
  color: var(--cyan);
  border-bottom: 1px dashed var(--cyan);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-intro__anchor:hover {
  color: var(--pink);
  border-color: var(--pink);
}

.page-about .about-intro__stamp {
  width: 172px;
  height: 172px;
  border: 2px solid var(--pink);
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  transform: rotate(-8deg);
  box-shadow: 0 0 0 4px var(--ink), 0 0 0 6px var(--pink);
  place-self: end start;
}

.page-about .about-intro__stamp-ring {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.28em;
  color: var(--pink);
  text-transform: uppercase;
}

.page-about .about-intro__stamp strong {
  font-size: 2.6rem;
  line-height: 1;
  color: var(--paper);
  display: block;
  margin: 0.3rem 0;
  font-family: var(--font-display);
}

.page-about .about-intro__stamp span:last-child {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

/* ===== 时间线 ===== */
.page-about .about-archives {
  position: relative;
  padding: 3.25rem 1.25rem 4rem;
  background:
    linear-gradient(160deg, transparent 68%, var(--red) 145%),
    var(--ink);
  border-bottom: 1px solid var(--border);
}

.page-about .about-rail__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--pink);
  margin-bottom: 0.75rem;
}

.page-about .about-rail__anchors {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 2rem;
}

.page-about .about-rail__link {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-decoration: none;
  color: var(--paper);
  border: 1px solid var(--border);
  background: rgba(245, 240, 230, 0.04);
  padding: 0.3rem 0.85rem;
  display: inline-flex;
  align-items: center;
  transition: border-color 0.22s ease, color 0.22s ease, background 0.22s ease;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus {
  border-color: var(--pink);
  color: var(--pink);
  background: rgba(255, 42, 122, 0.08);
}

.page-about .about-rail__link::before {
  content: "·";
  margin-right: 0.3rem;
  color: var(--cyan);
}

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

.page-about .about-timeline__head p {
  margin: 0.5rem 0 0;
  max-width: 42rem;
  color: rgba(245, 240, 230, 0.82);
}

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

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0.6rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--pink) 0%, var(--cyan) 55%, var(--red) 130%);
}

.page-about .about-milestone {
  position: relative;
  padding: 1.2rem 0 2.4rem 2.4rem;
  scroll-margin-top: calc(var(--header-h) + 1.25rem);
}

.page-about .about-milestone::after {
  content: "";
  position: absolute;
  left: 0.32rem;
  top: 1.9rem;
  width: 11px;
  height: 11px;
  background: var(--cyan);
  border: 3px solid var(--ink);
  border-radius: 50%;
  box-shadow: 0 0 0 2px var(--cyan);
}

.page-about .about-milestone__year {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
}

.page-about .about-milestone__num {
  font-size: clamp(2.4rem, 9vw, 4.8rem);
  font-family: var(--font-display);
  line-height: 0.9;
  color: var(--paper);
  background: linear-gradient(120deg, var(--pink), var(--cyan));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-about .about-milestone .annotate {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.24em;
  color: var(--pink);
  transform: rotate(180deg);
  text-transform: uppercase;
}

.page-about .about-milestone__card {
  position: relative;
  margin-top: 0.75rem;
  background: rgba(245, 240, 230, 0.05);
  border: 1px solid var(--border);
  border-left: 4px solid var(--red);
  padding: 1rem 1rem 1.2rem;
  transition: transform 0.28s ease, border-color 0.28s ease, background 0.28s ease;
}

.page-about .about-milestone__card:hover {
  transform: translateX(4px) rotate(-0.4deg);
  border-color: var(--pink);
  background: rgba(245, 240, 230, 0.08);
}

.page-about .about-milestone__tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  color: var(--ink);
  background: var(--red);
  padding: 0.18rem 0.6rem;
  display: inline-block;
  margin-bottom: 0.75rem;
  clip-path: polygon(0 0, 94% 0, 100% 50%, 94% 100%, 0 100%);
  letter-spacing: 0.14em;
}

.page-about .about-milestone__card h3 {
  margin: 0 0 0.4rem;
  font-size: 1.25rem;
  color: var(--paper);
}

.page-about .about-milestone__card p {
  margin: 0;
  font-size: 0.95rem;
  color: rgba(245, 240, 230, 0.82);
}

/* ===== 数据规模 ===== */
.page-about .about-data {
  position: relative;
  padding: 3.25rem 1.25rem 4rem;
  background:
    linear-gradient(135deg, var(--purple) 0%, var(--ink) 58%);
  border-bottom: 1px solid var(--border);
}

.page-about .about-data__inner {
  max-width: var(--max-w);
  margin-inline: auto;
}

.page-about .about-data__input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.page-about .about-data__switch {
  display: inline-flex;
  gap: 0.75rem;
  margin: 1.25rem 0 1rem;
  flex-wrap: wrap;
}

.page-about .about-data__switch-btn {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  cursor: pointer;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--paper);
  padding: 0.4rem 0.85rem;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  user-select: none;
}

.page-about .about-data__switch-btn:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about #about-data-standard:checked ~ .about-data__inner label[for="about-data-standard"],
.page-about #about-data-dense:checked ~ .about-data__inner label[for="about-data-dense"] {
  background: var(--pink);
  color: var(--ink);
  border-color: var(--pink);
}

.page-about .about-data__panel--dense {
  display: none;
}

.page-about #about-data-dense:checked ~ .about-data__inner .about-data__panel--dense {
  display: block;
}

.page-about #about-data-dense:checked ~ .about-data__inner .about-data__panel--standard {
  display: none;
}

.page-about .about-data__grid {
  display: grid;
  gap: 1.75rem;
  align-items: start;
}

.page-about .about-data__table-wrap {
  overflow-x: auto;
}

.page-about .about-data__table {
  width: 100%;
  border-collapse: collapse;
  min-width: 520px;
  font-size: 0.95rem;
}

.page-about .about-data__table caption {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--cyan);
  padding-bottom: 0.5rem;
  letter-spacing: 0.06em;
}

.page-about .about-data__table th {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--pink);
  border-bottom: 1px solid var(--pink);
  padding: 0.75rem 0.5rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.page-about .about-data__table td {
  padding: 0.8rem 0.5rem;
  border-bottom: 1px solid var(--border);
  color: var(--paper);
}

.page-about .about-data__table tbody tr:hover td {
  background: rgba(0, 229, 255, 0.08);
}

.page-about .about-data__td-num {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .about-data__dense {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.page-about .about-data__dense li {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.6rem 0.75rem;
  background: rgba(245, 240, 230, 0.05);
  border: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--paper);
  transition: border-color 0.2s ease;
}

.page-about .about-data__dense li:hover {
  border-color: var(--cyan);
}

.page-about .about-data__dense li span {
  font-family: var(--font-mono);
  color: var(--cyan);
  white-space: nowrap;
}

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

.page-about .about-data__chart img {
  width: 100%;
  height: auto;
  border: 1px solid var(--border);
  display: block;
}

.page-about .about-data__chart figcaption {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--paper);
  margin-top: 0.55rem;
  text-align: right;
}

/* ===== 团队 ===== */
.page-about .about-team {
  padding: 3.5rem 1.25rem 4rem;
  background: var(--ink);
  border-bottom: 1px solid var(--border);
}

.page-about .about-team__pool {
  max-width: var(--max-w);
  margin-inline: auto;
}

.page-about .about-team__head p {
  margin: 0.5rem 0 0;
  max-width: 40rem;
  color: rgba(245, 240, 230, 0.82);
}

.page-about .about-team__roles {
  display: grid;
  gap: 1.25rem;
  margin: 1.75rem 0;
}

.page-about .about-team__role {
  position: relative;
  background: var(--purple-deep);
  padding: 1.25rem 1.2rem 1.4rem 2.2rem;
  border-left: 4px solid var(--red);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.page-about .about-team__role:hover {
  transform: translateX(4px);
}

.page-about .about-team__role-num {
  position: absolute;
  left: 0.6rem;
  top: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--pink);
}

.page-about .about-team__role h3 {
  color: var(--paper);
  font-size: 1.3rem;
  margin: 0 0 0.4rem;
}

.page-about .about-team__role p {
  margin: 0;
  font-size: 0.95rem;
  color: rgba(245, 240, 230, 0.82);
}

.page-about .about-team__partner {
  margin: 1.5rem 0 0;
  border: 1px dashed var(--pink);
  padding: 1.1rem 1.2rem;
  background: rgba(255, 42, 122, 0.04);
}

.page-about .about-team__partner h4 {
  color: var(--pink);
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
}

.page-about .about-team__partner p {
  margin: 0;
  color: rgba(245, 240, 230, 0.82);
  font-size: 0.95rem;
}

.page-about .about-team__figure {
  margin: 2.5rem auto 0;
  max-width: 480px;
}

.page-about .about-team__figure img {
  width: 100%;
  height: auto;
  border: 1px solid var(--border);
  display: block;
}

.page-about .about-team__figure figcaption {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--cyan);
  margin-top: 0.55rem;
  text-align: center;
}

/* ===== 合规 ===== */
.page-about .about-compliance {
  position: relative;
  padding: 3.5rem 1.25rem 4rem;
  background:
    linear-gradient(180deg, var(--ink) 0%, var(--purple-deep) 140%);
  border-bottom: 1px solid var(--border);
}

.page-about .about-compliance__inner {
  max-width: var(--max-w);
  margin-inline: auto;
}

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

.page-about .about-compliance__intro p {
  margin: 0.5rem 0 0;
  color: rgba(245, 240, 230, 0.82);
}

.page-about .about-compliance__grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: 1fr;
}

.page-about .about-compliance__card {
  background: rgba(245, 240, 230, 0.05);
  border: 1px solid var(--border);
  padding: 1.35rem 1.25rem;
  position: relative;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .about-compliance__card:hover {
  border-color: var(--pink);
  transform: translateY(-3px);
}

.page-about .about-compliance__card::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 16px;
  bottom: 16px;
  width: 4px;
  background: var(--pink);
}

.page-about .about-compliance__kicker {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--cyan);
  display: block;
  margin-bottom: 0.5rem;
}

.page-about .about-compliance__card strong {
  color: var(--paper);
  font-size: 1.15rem;
  display: block;
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.page-about .about-compliance__card p {
  margin: 0;
  font-size: 0.9rem;
  color: rgba(245, 240, 230, 0.8);
}

.page-about .about-compliance__foot {
  margin-top: 2rem;
  color: var(--paper);
  font-size: 0.9rem;
}

.page-about .about-compliance__foot a {
  color: var(--cyan);
  text-decoration: underline dotted;
  transition: color 0.2s ease;
}

.page-about .about-compliance__foot a:hover {
  color: var(--pink);
}

/* ===== 愿景 ===== */
.page-about .about-vision {
  padding: 3.5rem 1.25rem 4rem;
  background:
    linear-gradient(115deg, var(--red) 0%, var(--ink) 34%),
    var(--ink);
  border-bottom: 1px solid var(--border);
}

.page-about .about-vision__inner {
  max-width: var(--max-w);
  margin-inline: auto;
}

.page-about .about-vision__lead {
  font-size: 1.2rem;
  color: var(--paper);
}

.page-about .about-vision__grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
  margin-top: 2rem;
}

.page-about .about-vision__point {
  display: grid;
  grid-template-columns: 2.75rem 1fr;
  column-gap: 0.85rem;
  border: 1px solid var(--border);
  background: rgba(245, 240, 230, 0.04);
  padding: 1rem;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.page-about .about-vision__point:hover {
  transform: translateY(-4px);
  border-color: var(--cyan);
}

.page-about .about-vision__icon {
  font-size: 1.9rem;
  line-height: 1;
  color: var(--pink);
  text-align: center;
  grid-row: span 2;
}

.page-about .about-vision__point h3 {
  font-size: 1.1rem;
  color: var(--paper);
  margin: 0;
}

.page-about .about-vision__point p {
  margin: 0.25rem 0 0;
  font-size: 0.9rem;
  color: rgba(245, 240, 230, 0.82);
}

/* ===== 结尾 ===== */
.page-about .about-end {
  display: grid;
  gap: 1.5rem;
  padding: 3.5rem 1.25rem 4.5rem;
  background: var(--ink);
  border-bottom: 1px solid var(--border);
}

.page-about .about-end__note {
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about .about-end__note .annotate {
  writing-mode: vertical-rl;
  color: var(--pink);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  transform: rotate(180deg);
}

.page-about .about-end__body {
  max-width: var(--max-w);
  margin-inline: auto;
}

.page-about .about-end h2 {
  color: var(--paper);
}

.page-about .about-end__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 1.75rem;
  align-items: center;
}

.page-about .about-end__link {
  color: var(--cyan);
  border-bottom: 1px dashed var(--cyan);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding-bottom: 0.15rem;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-end__link:hover {
  color: var(--pink);
  border-color: var(--pink);
}

.page-about .mono-label {
  color: var(--cyan);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  margin-bottom: 0.35rem;
  display: block;
}

/* ===== Desktop 增强 ===== */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 2.5rem 2rem 4rem;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 7fr 9fr;
    align-items: end;
  }

  .page-about .about-intro,
  .page-about .about-archives,
  .page-about .about-data,
  .page-about .about-team,
  .page-about .about-compliance,
  .page-about .about-vision,
  .page-about .about-end {
    padding-left: 2rem;
    padding-right: 2rem;
  }

  .page-about .about-intro__inner {
    grid-template-columns: 3fr 1fr;
    align-items: center;
    gap: 3rem;
  }

  .page-about .about-intro__stamp {
    place-self: center;
  }

  .page-about .about-archives {
    display: grid;
    grid-template-columns: 170px minmax(0, 1fr);
    gap: 2.5rem;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 1.5rem);
  }

  .page-about .about-rail__anchors {
    flex-direction: column;
    align-items: flex-start;
    border-left: 2px solid var(--pink);
    padding-left: 0.75rem;
  }

  .page-about .about-rail__link {
    background: transparent;
    border: 0;
    padding: 0.4rem 0.3rem;
    clip-path: none;
  }

  .page-about .about-rail__link::before {
    content: "▪";
  }

  .page-about .about-rail__link:hover {
    background: rgba(255, 42, 122, 0.12);
  }

  .page-about .about-timeline__list::before {
    left: 0.55rem;
  }

  .page-about .about-milestone {
    padding-left: 4.6rem;
  }

  .page-about .about-milestone::after {
    left: 0.25rem;
  }

  .page-about .about-milestone__num {
    font-size: clamp(3.4rem, 7vw, 5.8rem);
  }

  .page-about .about-milestone__card {
    margin-top: 1rem;
  }

  .page-about .about-data__grid {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 2rem;
  }

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

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

  .page-about .about-data__table {
    min-width: 0;
  }

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

  .page-about .about-team {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 360px;
    gap: 3rem;
  }

  .page-about .about-team__figure {
    margin: 4rem 0 0;
    max-width: 360px;
    position: sticky;
    top: calc(var(--header-h) + 1.5rem);
  }

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

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

  .page-about .about-end {
    grid-template-columns: 0.6fr 1.4fr;
    gap: 2rem;
  }

  .page-about .about-end__note {
    justify-content: flex-end;
  }
}