.page-about {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  border-radius: 0 0 var(--r-panel) var(--r-panel);
  background:
    radial-gradient(120% 90% at 84% 4%, rgba(30, 158, 143, 0.30), transparent 58%),
    radial-gradient(90% 72% at 8% 0%, rgba(127, 178, 217, 0.22), transparent 62%),
    var(--ink);
  color: var(--paper);
  padding: clamp(22px, 5vw, 48px) 0 clamp(36px, 6vw, 68px);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(116deg, rgba(247, 245, 240, 0.055) 0 1px, transparent 1px 28px);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  width: var(--shell);
  margin-inline: auto;
}

.page-about .about-hero .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  font-size: var(--fs-12);
  color: rgba(247, 245, 240, 0.62);
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .about-hero .breadcrumb a {
  color: var(--gold);
  text-decoration: none;
}

.page-about .about-hero .breadcrumb a:hover {
  text-decoration: underline;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-kicker {
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--gold);
  margin: 0 0 14px;
}

.page-about h1 {
  margin: 0;
  font-size: clamp(30px, 6.4vw, 52px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  font-weight: 900;
  max-width: 16em;
}

.page-about .about-lead {
  margin: 18px 0 0;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: rgba(247, 245, 240, 0.82);
  max-width: 40em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__figure {
  margin: 0;
  border-radius: var(--r-panel);
  overflow: hidden;
  border: 1px solid rgba(247, 245, 240, 0.14);
  background: var(--ink-2);
  box-shadow: 0 24px 48px -28px rgba(6, 15, 30, 0.9);
}

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

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: clamp(28px, 4vw, 44px) 0 0;
}

.page-about .about-facts__item {
  padding: 16px 18px;
  border-radius: var(--r-card);
  background: rgba(247, 245, 240, 0.07);
  border: 1px solid rgba(247, 245, 240, 0.12);
}

.page-about .about-facts__label {
  margin: 0;
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: rgba(247, 245, 240, 0.6);
}

.page-about .about-facts__num {
  margin: 6px 0 0;
  font-family: var(--mono);
  font-size: clamp(22px, 4vw, 30px);
  font-weight: 700;
  color: var(--gold-soft);
  letter-spacing: 0.02em;
}

/* ---------- 主体栅格 ---------- */
.page-about .about-body {
  padding-block: clamp(36px, 5vw, 56px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-about .about-toc {
  display: none;
}

.page-about .about-toc__title {
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--data);
  margin: 0 0 12px;
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 4px;
  border-left: 2px solid var(--stone);
}

.page-about .about-toc__link {
  display: block;
  padding: 8px 0 8px 14px;
  margin-left: -2px;
  border-left: 2px solid transparent;
  font-size: var(--fs-14);
  color: var(--data);
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--ink);
  border-left-color: var(--gold);
}

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

.page-about .chapter {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .chapter + .chapter {
  margin-top: clamp(44px, 7vw, 78px);
}

.page-about .chapter--airy {
  margin-top: clamp(64px, 9vw, 110px);
}

/* ---------- 章节标题 ---------- */
.page-about .ab-head {
  max-width: 46em;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .ab-index {
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--data);
  margin: 0 0 10px;
}

.page-about .ab-index::after {
  content: "";
  display: inline-block;
  width: 44px;
  height: 2px;
  margin-left: 12px;
  vertical-align: middle;
  background: var(--gold);
}

.page-about .ab-title {
  margin: 0;
  font-size: clamp(24px, 4vw, 36px);
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .ab-lead {
  margin: 14px 0 0;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: #33425a;
  max-width: 40em;
}

.page-about .ab-text {
  margin: 0 0 16px;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: #2b3950;
  max-width: 40em;
}

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

/* ---------- 01 起源 ---------- */
.page-about .chapter__grid {
  display: grid;
  gap: 24px;
}

.page-about .ab-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-point {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  border-radius: var(--r-card);
  background: #fff;
  border: 1px solid var(--stone);
  border-left: 4px solid var(--gold);
}

.page-about .ab-point__k {
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--ink-2);
}

.page-about .ab-point__v {
  font-size: var(--fs-14);
  line-height: 1.7;
  color: #2b3950;
}

/* ---------- 02 时间轴 ---------- */
.page-about .timeline {
  position: relative;
  padding-left: 8px;
}

.page-about .timeline__line {
  display: none;
}

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

.page-about .timeline__list::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 17px;
  width: 2px;
  background: linear-gradient(to bottom, var(--gold), rgba(242, 180, 65, 0.12));
}

.page-about .tl-item {
  position: relative;
  padding-left: 52px;
}

.page-about .tl-item + .tl-item {
  margin-top: 18px;
}

.page-about .tl-node {
  position: absolute;
  left: 0;
  top: 6px;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: var(--r-pill);
  background: var(--ink);
  color: var(--gold-soft);
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  border: 2px solid var(--gold);
  z-index: 1;
  box-shadow: 0 8px 18px -10px rgba(6, 15, 30, 0.9);
}

.page-about .tl-card {
  background: #fff;
  border: 1px solid var(--stone);
  border-radius: var(--r-card);
  box-shadow: 0 16px 32px -26px rgba(11, 27, 51, 0.7);
}

.page-about .tl-card[open] {
  border-color: var(--gold);
}

.page-about .tl-card__summary {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 46px 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: var(--fs-16);
  font-weight: 700;
  line-height: 1.55;
  color: var(--ink);
}

.page-about .tl-card__summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-card__mark {
  position: absolute;
  right: 16px;
  top: 20px;
  width: 14px;
  height: 14px;
  border-right: 2px solid var(--ink-2);
  border-bottom: 2px solid var(--ink-2);
  transform: rotate(45deg);
  transition: transform 0.18s ease;
}

.page-about .tl-card[open] .tl-card__mark {
  transform: rotate(-135deg);
  border-color: var(--red);
}

.page-about .tl-card__body {
  padding: 0 18px 18px;
}

.page-about .tl-card__body p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: #37455c;
}

.page-about .tl-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .tl-tag {
  padding: 4px 12px;
  border-radius: var(--r-pill);
  background: rgba(30, 158, 143, 0.12);
  color: #16786d;
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
}

/* ---------- 03 团队 ---------- */
.page-about .chapter--panel {
  border-radius: var(--r-panel);
  background:
    radial-gradient(110% 80% at 90% 0%, rgba(30, 158, 143, 0.28), transparent 60%),
    var(--ink-2);
  color: var(--paper);
  overflow: hidden;
}

.page-about .panel-body {
  padding: clamp(24px, 4vw, 40px);
}

.page-about .ab-head--ink .ab-index {
  color: rgba(247, 245, 240, 0.62);
}

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

.page-about .ab-head--ink .ab-lead {
  color: rgba(247, 245, 240, 0.78);
}

.page-about .team {
  display: grid;
  gap: 22px;
}

.page-about .team__chart {
  display: grid;
  place-items: center;
  padding: 8px 0;
}

.page-about .team-ring {
  width: min(210px, 62vw);
  height: auto;
  filter: drop-shadow(0 14px 28px rgba(6, 15, 30, 0.55));
}

.page-about .team-ring__num {
  font-family: var(--mono);
  font-size: 30px;
  font-weight: 700;
  fill: var(--gold-soft);
}

.page-about .team-ring__unit {
  font-family: var(--sans);
  font-size: 12px;
  fill: rgba(247, 245, 240, 0.62);
  letter-spacing: 0.1em;
}

.page-about .team-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .team-legend__item {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr);
  grid-template-areas:
    "dot name"
    "dot desc";
  column-gap: 12px;
  padding: 12px 14px;
  border-radius: var(--r-card);
  background: rgba(247, 245, 240, 0.06);
  border: 1px solid rgba(247, 245, 240, 0.1);
  transition: background 0.18s ease, transform 0.18s ease;
}

.page-about .team-legend__item:hover,
.page-about .team-legend__item:focus-within {
  background: rgba(247, 245, 240, 0.12);
  transform: translateY(-2px);
}

.page-about .team-legend__dot {
  grid-area: dot;
  align-self: start;
  margin-top: 6px;
  width: 12px;
  height: 12px;
  border-radius: var(--r-pill);
}

.page-about .team-legend__item--a .team-legend__dot { background: var(--gold); }
.page-about .team-legend__item--b .team-legend__dot { background: var(--teal); }
.page-about .team-legend__item--c .team-legend__dot { background: var(--glacier); }
.page-about .team-legend__item--d .team-legend__dot { background: var(--stone); }

.page-about .team-legend__name {
  grid-area: name;
  margin: 0;
  font-size: var(--fs-16);
  font-weight: 700;
  color: var(--paper);
}

.page-about .team-legend__name b {
  font-weight: 700;
  color: var(--gold-soft);
  margin-left: 6px;
}

.page-about .team-legend__desc {
  grid-area: desc;
  margin: 4px 0 0;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: rgba(247, 245, 240, 0.74);
}

.page-about .team__figure {
  margin: 24px 0 0;
  border-radius: var(--r-card);
  overflow: hidden;
  border: 1px solid rgba(247, 245, 240, 0.14);
  background: rgba(6, 15, 30, 0.4);
}

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

.page-about .team__figure figcaption {
  padding: 12px 16px;
  font-size: var(--fs-12);
  line-height: 1.7;
  color: rgba(247, 245, 240, 0.66);
}

/* ---------- 04 覆盖 ---------- */
.page-about .cover {
  display: grid;
  gap: 20px;
}

.page-about .cover__map {
  border-radius: var(--r-panel);
  background: var(--ink);
  padding: 14px;
  border: 1px solid var(--stone);
}

.page-about .cover__map svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .cover__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .cover__list li {
  padding: 14px 16px;
  border-radius: var(--r-card);
  background: #fff;
  border: 1px solid var(--stone);
}

.page-about .cover__k {
  display: inline-block;
  padding: 2px 10px;
  border-radius: var(--r-pill);
  background: rgba(242, 180, 65, 0.2);
  color: #7a5410;
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
}

.page-about .cover__list p {
  margin: 8px 0 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: #37455c;
}

.page-about .cover__body .link-more {
  display: inline-block;
  margin-top: 14px;
  font-size: var(--fs-14);
  font-weight: 700;
  color: var(--ink-2);
  text-decoration: none;
  border-bottom: 2px solid var(--gold);
  padding-bottom: 2px;
}

.page-about .cover__figure {
  margin: 22px 0 0;
  border-radius: var(--r-panel);
  overflow: hidden;
  border: 1px solid var(--stone);
}

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

/* ---------- 05 校对 ---------- */
.page-about .check {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  counter-reset: none;
}

.page-about .check__step {
  padding: 18px;
  border-radius: var(--r-card);
  background: #fff;
  border: 1px solid var(--stone);
  border-top: 3px solid var(--teal);
}

.page-about .check__num {
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--data);
}

.page-about .check__name {
  margin: 8px 0 6px;
  font-size: var(--fs-18);
  font-weight: 800;
  color: var(--ink);
}

.page-about .check__step p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: #37455c;
}

.page-about .check__note {
  margin-top: 16px;
  padding: 18px 20px;
  border-radius: var(--r-card);
  background: rgba(242, 180, 65, 0.14);
  border-left: 4px solid var(--gold);
}

.page-about .check__note p {
  margin: 0 0 10px;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: #2b3950;
}

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

.page-about .check__note strong {
  color: var(--ink);
}

/* ---------- 06 协作 ---------- */
.page-about .chapter--closing {
  border-radius: var(--r-panel);
  background:
    radial-gradient(100% 80% at 8% 100%, rgba(192, 57, 43, 0.18), transparent 60%),
    var(--ink);
  color: var(--paper);
  padding: clamp(24px, 4vw, 40px);
}

.page-about .collab__grid {
  display: grid;
  gap: 12px;
}

.page-about .collab__card {
  padding: 18px;
  border-radius: var(--r-card);
  background: rgba(247, 245, 240, 0.06);
  border: 1px solid rgba(247, 245, 240, 0.12);
}

.page-about .collab__name {
  margin: 0 0 8px;
  font-size: var(--fs-18);
  font-weight: 800;
  color: var(--gold-soft);
}

.page-about .collab__card p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: rgba(247, 245, 240, 0.8);
}

.page-about .collab__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 入场动效 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .page-about .team-legend__item,
  .page-about .tl-card__mark {
    transition: none;
  }
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .chapter__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 26px;
    align-items: start;
  }

  .page-about .cover {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: center;
    gap: 24px;
  }

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

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

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
    gap: 44px;
  }

  .page-about .about-body {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 56px;
    padding-block: 64px;
  }

  .page-about .about-toc {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

  .page-about .team {
    grid-template-columns: minmax(0, 240px) minmax(0, 1fr);
    align-items: center;
    gap: 32px;
  }

  .page-about .team__chart {
    padding: 0;
  }

  /* 时间轴左右交替 */
  .page-about .timeline {
    padding-left: 0;
  }

  .page-about .timeline__line {
    display: block;
    position: absolute;
    left: 50%;
    top: 0;
    height: 100%;
    width: 80px;
    transform: translateX(-50%);
    z-index: 0;
  }

  .page-about .timeline__list::before {
    display: none;
  }

  .page-about .tl-item {
    padding-left: 0;
    width: 50%;
  }

  .page-about .tl-item:nth-child(odd) {
    padding-right: 46px;
  }

  .page-about .tl-item:nth-child(even) {
    margin-left: 50%;
    padding-left: 46px;
    margin-top: -14px;
  }

  .page-about .tl-node {
    left: auto;
    right: -18px;
    top: 14px;
  }

  .page-about .tl-item:nth-child(even) .tl-node {
    right: auto;
    left: -18px;
  }

  .page-about .tl-card {
    position: relative;
    z-index: 1;
  }
}
<<<END>>>