.page-about {
  background: var(--ink-900);
  color: var(--fog);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .about-wrap {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 32px) 0 40px;
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(200, 240, 60, 0.16) 0%, rgba(200, 240, 60, 0) 58%),
    radial-gradient(90% 70% at 0% 100%, rgba(43, 79, 140, 0.22) 0%, rgba(43, 79, 140, 0) 62%),
    var(--ink-900);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--ash);
  margin-bottom: 28px;
}

.page-about .crumbs a {
  color: var(--ash);
  text-decoration: none;
}

.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--lime);
}

.page-about .about-hero__kicker {
  margin: 0 0 18px;
  color: var(--lime);
  font-size: 12px;
  letter-spacing: 0.18em;
  font-family: var(--font-mono);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-size: clamp(38px, 8.4vw, 88px);
  line-height: 0.98;
  font-weight: 800;
  letter-spacing: -0.02em;
  transform: skewX(-2deg);
  transform-origin: left bottom;
  color: var(--fog);
}

.page-about .about-hero__lead {
  margin: 0 0 28px;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(242, 244, 238, 0.82);
}

.page-about .about-hero__meta {
  list-style: none;
  margin: 0;
  padding: 18px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  border-top: 1px solid var(--line);
}

.page-about .meta-item {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .meta-num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  color: var(--lime);
  line-height: 1;
}

.page-about .meta-label {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ash);
}

/* ---------- 主体网格 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  padding-block: 8px 48px;
}

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

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  padding: 20px 0 12px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-index__title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ash);
  font-family: var(--font-mono);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--fog);
  text-decoration: none;
  font-size: 13px;
  transition: border-color 200ms var(--ease), color 200ms var(--ease), background 200ms var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-color: var(--lime-dim);
  color: var(--lime);
  background: rgba(200, 240, 60, 0.06);
}

.page-about .about-index__code {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--lime);
  letter-spacing: 0.06em;
}

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

/* ---------- 章节 ---------- */
.page-about .chapter {
  padding: 40px 0 36px;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .chapter__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 22px;
}

.page-about .chapter__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 56px;
  line-height: 0.8;
  letter-spacing: -0.03em;
  color: transparent;
  -webkit-text-stroke: 1.4px rgba(200, 240, 60, 0.55);
}

.page-about .chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 22px;
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: -0.01em;
  transform: skewX(-2deg);
  transform-origin: left center;
  color: var(--fog);
}

.page-about .chapter__body p {
  margin: 0 0 1.2em;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(242, 244, 238, 0.8);
  max-width: 62ch;
}

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

.page-about .chapter__link {
  padding-left: 14px;
  border-left: 2px solid var(--lime-dim);
  font-size: 14px !important;
  color: rgba(242, 244, 238, 0.7) !important;
}

.page-about .inline-link {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 240, 60, 0.4);
  padding-bottom: 1px;
}

.page-about .inline-link:hover,
.page-about .inline-link:focus-visible {
  border-bottom-color: var(--lime);
}

/* ---------- 流程步骤 ---------- */
.page-about .step-list {
  list-style: none;
  margin: 0 0 1.4em;
  padding: 0;
  display: grid;
  gap: 10px;
  counter-reset: step;
}

.page-about .step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 14px 16px;
  background: var(--ink-700);
  border-left: 2px solid rgba(200, 240, 60, 0.45);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-about .step__num {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--lime);
  letter-spacing: 0.04em;
  padding-top: 2px;
}

.page-about .step__text {
  margin: 0 !important;
  font-size: 14px !important;
  line-height: 1.8 !important;
  color: rgba(242, 244, 238, 0.84) !important;
  max-width: none !important;
}

/* ---------- 图片 ---------- */
.page-about .media {
  margin: 28px 0 0;
  display: block;
}

.page-about .media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
  background: var(--ink-700);
}

.page-about .media--slant img {
  clip-path: polygon(0 0, 100% 3%, 100% 100%, 0 96%);
}

.page-about .media__caption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ash);
  line-height: 1.6;
}

.page-about .chapter__figure img {
  max-height: 380px;
}

/* ---------- 值班团队 ---------- */
.page-about .crew-grid {
  display: grid;
  gap: 12px;
  margin: 0 0 1.4em;
}

.page-about .crew-card {
  padding: 18px 18px 20px;
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .crew-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-about .crew-card__label {
  margin: 8px 0 10px;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--fog);
  font-weight: 700;
}

.page-about .crew-card__text {
  margin: 0 !important;
  font-size: 13px !important;
  line-height: 1.8 !important;
  color: var(--ash) !important;
  max-width: none !important;
}

/* ---------- 时间线带 ---------- */
.page-about .timeline-band {
  margin-top: 8px;
  padding: 48px 0;
  background:
    linear-gradient(180deg, rgba(16, 19, 18, 0.96) 0%, rgba(11, 31, 25, 0.98) 100%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .timeline-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-bottom: 30px;
}

.page-about .timeline-head__lead {
  margin: 12px 0 0;
  max-width: 56ch;
  font-size: 14px;
  line-height: 1.9;
  color: rgba(242, 244, 238, 0.72);
}

.page-about .timeline-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .tl-list {
  position: relative;
  padding-left: 22px;
  display: grid;
  gap: 10px;
}

.page-about .tl-list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--lime-dim) 0%, rgba(154, 166, 159, 0.35) 100%);
}

.page-about .tl-node {
  position: relative;
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 18px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(200, 240, 60, 0.14);
}

.page-about .tl-node:hover {
  border-color: var(--lime-dim);
}

.page-about .tl-node__sum {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 44px 14px 16px;
  position: relative;
}

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

.page-about .tl-node__sum::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 12px;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--lime);
  line-height: 1;
}

.page-about .tl-node[open] .tl-node__sum::after {
  content: "−";
}

.page-about .tl-node__code {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--lime);
  letter-spacing: 0.08em;
  flex: 0 0 auto;
}

.page-about .tl-node__title {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--fog);
}

.page-about .tl-node__desc {
  margin: 0;
  padding: 0 20px 16px 16px;
  font-size: 13px;
  line-height: 1.85;
  color: var(--ash);
}

.page-about .timeline-figure {
  margin: 0;
}

.page-about .timeline-figure img {
  max-height: 320px;
  object-position: center;
}

/* ---------- 看台横图 ---------- */
.page-about .crowd-band {
  position: relative;
  margin: 0;
  width: 100%;
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .crowd-band img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.05);
}

.page-about .crowd-band__caption {
  position: absolute;
  left: var(--gutter);
  right: var(--gutter);
  bottom: 14px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: rgba(242, 244, 238, 0.72);
  text-shadow: 0 1px 8px rgba(11, 31, 25, 0.9);
}

/* ---------- 浅色承诺区 ---------- */
.page-about .promise {
  background: var(--fog);
  color: var(--ink-800);
  padding: 52px 0 56px;
  border-top: 1px solid rgba(11, 31, 25, 0.12);
}

.page-about .promise__head {
  max-width: 60ch;
  margin-bottom: 30px;
}

.page-about .promise__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 56px;
  font-weight: 700;
  line-height: 0.85;
  letter-spacing: -0.03em;
  color: transparent;
  -webkit-text-stroke: 1.4px rgba(11, 31, 25, 0.45);
  margin-bottom: 12px;
}

.page-about .promise__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 24px;
  line-height: 1.3;
  font-weight: 800;
  transform: skewX(-2deg);
  transform-origin: left center;
  color: var(--ink-800);
}

.page-about .promise__lead {
  margin: 0;
  font-size: 14px;
  line-height: 1.9;
  color: rgba(16, 19, 18, 0.72);
}

.page-about .promise__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .promise-card {
  padding: 20px 18px 22px;
  background: #FFFFFF;
  border: 1px solid rgba(11, 31, 25, 0.14);
  border-top: 3px solid var(--ink-900);
  border-radius: var(--radius);
}

.page-about .promise-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--brick);
  margin-bottom: 10px;
}

.page-about .promise-card__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  color: var(--ink-800);
}

.page-about .promise-card__text {
  margin: 0;
  font-size: 13px;
  line-height: 1.9;
  color: rgba(16, 19, 18, 0.76);
}

.page-about .promise__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 30px;
}

/* ---------- 平板 ---------- */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 48px) 0 56px;
  }

  .page-about .about-hero__meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .chapter {
    padding: 48px 0 44px;
  }

  .page-about .chapter__num {
    font-size: 76px;
  }

  .page-about .chapter__title {
    font-size: 26px;
  }

  .page-about .chapter__body p {
    font-size: 16px;
  }

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

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

  .page-about .promise__num {
    font-size: 76px;
  }

  .page-about .timeline-band {
    padding: 60px 0;
  }

  .page-about .timeline-head {
    grid-template-columns: 140px minmax(0, 1fr);
    align-items: start;
    gap: 20px;
  }
}

/* ---------- 桌面：侧栏索引 ---------- */
@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 0 64px;
    padding-block: 24px 64px;
  }

  .page-about .about-shell--solo {
    padding-bottom: 24px;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h-sm) + 28px);
    align-self: start;
    border-bottom: 0;
    padding: 8px 0 0;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    padding: 9px 10px;
    font-size: 13px;
    color: rgba(242, 244, 238, 0.68);
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    border-left-color: var(--lime);
    background: rgba(200, 240, 60, 0.07);
    color: var(--fog);
  }

  .page-about .about-index__top {
    display: inline-block;
    margin-top: 20px;
    font-size: 11px;
    letter-spacing: 0.14em;
    color: var(--ash);
    text-decoration: none;
    border-bottom: 1px dashed rgba(154, 166, 159, 0.5);
    padding-bottom: 2px;
  }

  .page-about .about-index__top:hover,
  .page-about .about-index__top:focus-visible {
    color: var(--lime);
    border-bottom-color: var(--lime-dim);
  }

  .page-about .chapter__num {
    font-size: 96px;
  }

  .page-about .chapter__title {
    font-size: 28px;
    padding-top: 6px;
  }

  .page-about .chapter__body p {
    font-size: 16.5px;
    line-height: 1.95;
  }

  .page-about .chapter__figure img {
    max-height: 420px;
  }

  .page-about .timeline-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .timeline-figure img {
    max-height: 460px;
  }

  .page-about .promise {
    padding: 72px 0 80px;
  }

  .page-about .promise__num {
    font-size: 96px;
  }

  .page-about .promise__title {
    font-size: 32px;
  }

  .page-about .promise-card {
    padding: 26px 24px 28px;
  }

  .page-about .promise-card:hover {
    border-top-color: var(--lime);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .tl-node {
    transition: none;
  }
}
<<<END>>>