.page-about {
  --about-rule: rgba(201, 214, 228, 0.16);
  --about-rule-strong: rgba(201, 214, 228, 0.34);
  --about-rule-ink: rgba(7, 18, 31, 0.14);
  background: var(--deep);
  color: var(--steel);
  font-family: var(--ff-body);
  font-size: 16px;
  line-height: 1.8;
  overflow-x: hidden;
}

.page-about * {
  box-sizing: border-box;
}

.page-about .about-crumbs {
  padding-top: 22px;
}

.page-about .about-crumbs .breadcrumbs__item {
  color: var(--violet);
  font-size: 13px;
  text-decoration: none;
}

.page-about .about-crumbs .breadcrumbs__item[aria-current="page"] {
  color: var(--steel);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  margin-top: 14px;
  padding: 44px 0 56px;
  background:
    radial-gradient(120% 90% at 88% 8%, rgba(95, 227, 207, 0.14), transparent 58%),
    var(--ink);
  border-top: 1px solid var(--about-rule-strong);
  border-bottom: 1px solid var(--about-rule);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(201, 214, 228, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201, 214, 228, 0.06) 1px, transparent 1px);
  background-size: 72px 72px;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__title {
  font-family: var(--ff-head);
  font-weight: 700;
  font-size: clamp(30px, 7.4vw, 52px);
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--white);
  margin: 14px 0 0;
  max-width: 18ch;
}

.page-about .about-hero__lead {
  max-width: 60ch;
  margin: 22px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--steel);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .about-hero__facts li {
  background: var(--ink);
  padding: 16px 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-hero__num {
  font-family: var(--ff-mono);
  font-size: 26px;
  line-height: 1.1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__cap {
  font-size: 13px;
  line-height: 1.5;
  color: var(--violet);
}

/* ---------- 章节骨架 ---------- */

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

.page-about .chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .chapter__rail {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-top: 10px;
  border-top: 1px solid var(--about-rule-strong);
}

.page-about .chapter__no {
  font-family: var(--ff-mono);
  font-size: 30px;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .chapter__scale {
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--violet);
  text-transform: uppercase;
  white-space: nowrap;
}

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

.page-about .chapter__body p {
  margin: 0 0 16px;
  max-width: 66ch;
  line-height: 1.85;
  color: var(--steel);
}

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

.page-about .chapter__body .section__title {
  margin: 0 0 20px;
  color: var(--white);
  font-family: var(--ff-head);
  font-weight: 700;
  font-size: clamp(22px, 4.6vw, 32px);
  line-height: 1.22;
  letter-spacing: 0.03em;
}

.page-about .chapter__figure {
  margin-top: 30px;
}

.page-about .chapter__figure .media-frame {
  max-width: 560px;
}

.page-about .chapter__figure--wide .media-frame {
  max-width: 100%;
}

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

/* ---------- 冷白章节 ---------- */

.page-about .section--paper {
  background: var(--paper);
  color: var(--ink);
  border-top: 1px solid var(--about-rule-ink);
}

.page-about .section--paper .chapter__rail {
  border-top-color: var(--about-rule-ink);
}

.page-about .section--paper .chapter__no {
  color: var(--ink-teal);
}

.page-about .section--paper .chapter__scale {
  color: var(--ink-muted);
}

.page-about .section--paper .chapter__body .section__title {
  color: var(--ink);
}

.page-about .section--paper .chapter__body p {
  color: var(--ink-muted);
}

.page-about .section--paper .media-frame__caption {
  color: var(--ink-muted);
}

/* ---------- 规模折线 ---------- */

.page-about .growth {
  margin-top: 42px;
  padding: 24px 16px 8px;
  background: var(--ink);
  border: 1px solid var(--about-rule);
}

.page-about .growth__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 16px;
  margin-bottom: 12px;
}

.page-about .growth__title {
  font-family: var(--ff-head);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.06em;
  color: var(--white);
  margin: 0;
}

.page-about .growth__note {
  margin: 0;
  font-size: 12px;
  color: var(--violet);
}

.page-about .growth__svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.page-about .growth__grid line {
  stroke: var(--about-rule);
  stroke-width: 1;
}

.page-about .growth__area {
  fill: rgba(95, 227, 207, 0.12);
  stroke: none;
}

.page-about .growth__line {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 2.5;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.has-js .page-about .growth__line {
  stroke-dasharray: 1400;
  stroke-dashoffset: 1400;
  transition: stroke-dashoffset 900ms var(--ease);
}

.has-js .page-about .growth.is-in .growth__line {
  stroke-dashoffset: 0;
}

.page-about .growth__dots circle {
  fill: var(--ink);
  stroke: var(--cyan);
  stroke-width: 2;
}

.page-about .growth__value {
  font-family: var(--ff-mono);
  font-size: 13px;
  fill: var(--cyan);
  text-anchor: middle;
  font-variant-numeric: tabular-nums;
}

.page-about .growth__label {
  font-family: var(--ff-mono);
  font-size: 12px;
  fill: var(--violet);
  text-anchor: middle;
}

/* ---------- 整理流程 ---------- */

.page-about .method {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .method__step {
  padding: 22px 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .method__no {
  display: block;
  font-family: var(--ff-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--lava);
  margin-bottom: 8px;
}

.page-about .method__name {
  font-family: var(--ff-head);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: 0.04em;
  color: var(--white);
  margin: 0 0 8px;
}

.page-about .method__step p {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--steel);
}

/* ---------- 更新节奏 ---------- */

.page-about .cadence {
  margin-top: 30px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-rule-ink);
  border: 1px solid var(--about-rule-ink);
}

.page-about .cadence__item {
  background: var(--paper);
  padding: 20px 18px 22px;
}

.page-about .cadence__key {
  display: inline-block;
  font-family: var(--ff-mono);
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--ink-teal);
  padding: 3px 10px;
  border: 1px solid rgba(11, 107, 96, 0.32);
  margin-bottom: 12px;
}

.page-about .cadence__name {
  font-family: var(--ff-head);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.04em;
  color: var(--ink);
  margin: 0 0 8px;
}

.page-about .cadence__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-muted);
}

/* ---------- 里程碑年表 ---------- */

.page-about .timeline-banner {
  margin: 30px 0 0;
}

.page-about .timeline {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 16px;
  width: 1px;
  background: var(--about-rule-strong);
}

.page-about .timeline__node {
  position: relative;
  padding: 0 0 28px 32px;
}

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

.page-about .timeline__dot {
  position: absolute;
  left: 0;
  top: 8px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  background: var(--deep);
}

.page-about .timeline__time {
  display: block;
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--violet);
  text-transform: uppercase;
}

.page-about .timeline__name {
  font-family: var(--ff-head);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.04em;
  color: var(--white);
  margin: 6px 0 6px;
}

.page-about .timeline__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--steel);
}

.page-about .timeline__node:hover .timeline__dot {
  background: var(--cyan);
}

/* ---------- 引用与纠错 ---------- */

.page-about .cite-block {
  margin: 26px 0;
  padding: 2px 0 2px 18px;
  border-left: 2px solid var(--ink-teal);
}

.page-about .cite-block__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .cite-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0 34px;
}

.page-about .cite-actions .btn {
  text-decoration: none;
}

.page-about .cite-related {
  padding-top: 22px;
  border-top: 1px solid var(--about-rule-ink);
}

.page-about .cite-related__title {
  font-family: var(--ff-head);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--ink);
  margin: 0 0 12px;
}

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

.page-about .cite-related__list li {
  border-bottom: 1px solid var(--about-rule-ink);
}

.page-about .cite-related__list a {
  display: block;
  padding: 13px 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink-teal);
  text-decoration: none;
}

.page-about .cite-related__list a:hover {
  color: var(--ink);
}

/* ---------- 平板 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero {
    padding: 56px 0 64px;
  }

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

  .page-about .about-hero__num {
    font-size: 30px;
  }

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

  .page-about .method {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 40px;
    border-top: 0;
  }

  .page-about .method__step {
    border-top: 1px solid var(--about-rule);
  }

  .page-about .growth {
    padding: 28px 26px 12px;
  }
}

/* ---------- 桌面 ---------- */

@media (min-width: 900px) {
  .page-about .chapter {
    padding: 72px 0;
  }

  .page-about .chapter__grid {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 0 52px;
  }

  .page-about .chapter__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .chapter__no {
    font-size: 38px;
  }

  .page-about .chapter__scale {
    letter-spacing: 0.2em;
  }

  .page-about .about-hero__title {
    max-width: 22ch;
  }

  .page-about .growth {
    margin-left: 184px;
    margin-right: 0;
  }

  .page-about .method {
    margin-left: 184px;
    margin-right: 0;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 28px;
  }

  .page-about .cadence {
    margin-left: 184px;
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .timeline-banner {
    margin-left: 184px;
  }

  .page-about .timeline {
    margin-left: 184px;
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 0 18px;
    margin-top: 44px;
  }

  .page-about .timeline::before {
    left: 7px;
    right: 0;
    top: 7px;
    bottom: auto;
    width: auto;
    height: 1px;
  }

  .page-about .timeline__node {
    padding: 30px 0 0;
  }

  .page-about .timeline__dot {
    left: 0;
    top: 0;
  }

  .page-about .cite-actions {
    margin-bottom: 40px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__num {
    font-size: 34px;
  }
}
<<<END>>>