.page-about {
  --about-rail-w: 208px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: hidden;
}

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

.page-about .data {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 面包屑条 ---------- */
.page-about .about-crumb {
  background: var(--mist);
  border-bottom: 1px solid var(--line);
}

.page-about .about-crumb .wrap {
  padding-top: 14px;
  padding-bottom: 14px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-bottom: clamp(36px, 6vw, 66px);
  background:
    radial-gradient(120% 95% at 84% 6%, rgba(18, 134, 79, 0.62), transparent 62%),
    radial-gradient(90% 70% at 8% 100%, rgba(255, 107, 0, 0.16), transparent 68%),
    linear-gradient(162deg, var(--stand-deep) 0%, var(--grass) 64%, #0d6b40 100%);
  color: #fff;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  opacity: 0.7;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 36px;
  padding-top: clamp(44px, 7vw, 90px);
  padding-bottom: clamp(32px, 5vw, 54px);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    align-items: center;
    gap: 58px;
  }
}

.page-about .about-hero__kicker {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--amber);
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-size: clamp(30px, 5.4vw, 56px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: #fff;
}

.page-about .about-hero__lead {
  margin: 0 0 28px;
  max-width: 32em;
  font-size: 16.5px;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.82);
}

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

/* 纯 CSS 看台装置 */
.page-about .about-hero__visual {
  position: relative;
}

.page-about .stand {
  position: relative;
  display: grid;
  gap: 12px;
  padding: 26px;
  border-radius: var(--radius-l);
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.02));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.12);
}

.page-about .stand__tier {
  height: 22px;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, rgba(232, 243, 236, 0.34), rgba(255, 181, 71, 0.5));
}

.page-about .stand__tier:nth-child(1) { width: 100%; }
.page-about .stand__tier:nth-child(2) { width: 86%; }
.page-about .stand__tier:nth-child(3) { width: 72%; }
.page-about .stand__tier:nth-child(4) { width: 58%; }
.page-about .stand__tier:nth-child(5) {
  width: 44%;
  background: linear-gradient(90deg, rgba(255, 181, 71, 0.9), var(--orange));
}

.page-about .stand__pulse {
  position: absolute;
  right: 32px;
  bottom: 30px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 0 rgba(255, 107, 0, 0.55);
  animation: about-pulse 2.8s ease-out infinite;
}

@keyframes about-pulse {
  0%   { box-shadow: 0 0 0 0 rgba(255, 107, 0, 0.5); }
  70%  { box-shadow: 0 0 0 18px rgba(255, 107, 0, 0); }
  100% { box-shadow: 0 0 0 0 rgba(255, 107, 0, 0); }
}

/* 首屏关键数字 */
.page-about .about-hero__facts {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 22px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
}

@media (min-width: 760px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px 28px;
  }
}

.page-about .fact__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--amber);
}

.page-about .fact__plus {
  font-size: 18px;
  vertical-align: super;
  margin-left: 1px;
}

.page-about .fact__label {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  color: rgba(255, 255, 255, 0.66);
}

/* ---------- 主体长卷骨架 ---------- */
.page-about .about-body {
  background: linear-gradient(180deg, var(--paper) 0%, var(--mist) 42%, var(--paper) 100%);
}

.page-about .about-body__grid {
  display: grid;
  gap: 0;
  padding-top: clamp(30px, 5vw, 56px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

@media (min-width: 1024px) {
  .page-about .about-body__grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(34px, 5vw, 76px);
    align-items: start;
  }
}

/* ---------- 章节索引（左侧轨） ---------- */
.page-about .about-rail {
  display: none;
}

@media (min-width: 1024px) {
  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 118px;
    padding-left: 20px;
    border-left: 2px solid var(--line-strong);
  }
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--grey);
}

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

.page-about .about-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 0;
  font-size: 13.5px;
  color: var(--grey);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

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

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding: 38px 0 clamp(38px, 5.5vw, 66px);
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 112px;
}

.page-about .about-sec:first-child {
  padding-top: 8px;
}

.page-about .about-sec:last-of-type {
  border-bottom: 0;
}

.page-about .section-head {
  margin-bottom: 26px;
}

.page-about .section-no {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .section-head h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(23px, 3.4vw, 34px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--stand-deep);
}

.page-about .section-head p {
  margin: 0;
  max-width: 48em;
  font-size: 15.5px;
  color: var(--grey);
}

.page-about .about-sec__body p {
  margin: 0 0 16px;
  max-width: 52em;
  font-size: 16.5px;
  line-height: 1.88;
  color: var(--ink-soft);
}

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

.page-about .about-sec__body a,
.page-about .coverage-foot a {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-note {
  margin: 20px 0 22px;
  padding: 14px 18px;
  border-left: 4px solid var(--orange);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  background: var(--mist);
  font-size: 15px;
  color: var(--ink-soft);
}

.page-about .about-sec__figure {
  margin: 6px 0 0;
  border-radius: var(--radius-l);
  overflow: hidden;
}

.page-about .about-sec__figure img {
  width: 100%;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  filter: saturate(0.78);
}

/* ---------- 01 年份刻度 ---------- */
.page-about .yearline {
  list-style: none;
  margin: 30px 0 0;
  padding: 0 0 0 30px;
  display: grid;
  gap: 24px;
  border-left: 2px solid var(--line-strong);
}

.page-about .yearline > li {
  position: relative;
}

.page-about .yearline > li::before {
  content: "";
  position: absolute;
  left: -37px;
  top: 7px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 0, 0.16);
}

.page-about .yearline__y {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--grass);
}

.page-about .yearline__t {
  display: block;
  margin-top: 6px;
  max-width: 46em;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 02 数据生产线 ---------- */
.page-about .flowline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

@media (min-width: 780px) {
  .page-about .flowline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
  }
}

.page-about .flowline__node {
  position: relative;
  padding: 24px 18px 20px;
  border-radius: var(--radius-l);
  border: 1px solid var(--line);
  background: var(--paper);
  box-shadow: var(--shadow-soft);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.page-about .flowline__node:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lift);
}

.page-about .flowline__node::before {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  top: 0;
  height: 4px;
  border-radius: 0 0 4px 4px;
  background: linear-gradient(90deg, var(--field-bright), var(--orange));
}

.page-about .flowline__step {
  display: block;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--grey);
}

.page-about .flowline__title {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.3;
  color: var(--stand-deep);
}

.page-about .flowline__meta {
  margin: 0 0 10px;
  font-size: 15px;
  color: var(--orange);
  font-weight: 700;
}

.page-about .flowline__meta .data {
  font-size: 20px;
}

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

/* ---------- 03 团队比例条 ---------- */
.page-about .team-bar {
  display: flex;
  gap: 5px;
  height: 62px;
  margin-bottom: 18px;
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .team-bar__seg {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-basis: 0;
  flex-shrink: 1;
  min-width: 42px;
  border-radius: var(--radius-s);
  transition: filter 0.22s ease;
}

.page-about .seg--a { flex-grow: 38; background: var(--grass); }
.page-about .seg--b { flex-grow: 16; background: var(--field-bright); }
.page-about .seg--c { flex-grow: 19; background: var(--amber); }
.page-about .seg--d { flex-grow: 27; background: var(--blue); }

.page-about .team-bar__seg:hover {
  filter: brightness(1.08);
}

.page-about .team-bar__tag {
  padding: 3px 11px;
  border-radius: var(--radius-pill);
  background: rgba(6, 52, 31, 0.62);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 11.5px;
  white-space: nowrap;
  opacity: 0;
  transform: translateY(5px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.page-about .team-bar__seg:hover .team-bar__tag {
  opacity: 1;
  transform: none;
}

@media (max-width: 760px) {
  .page-about .team-bar {
    flex-direction: column;
    height: auto;
    gap: 8px;
  }

  .page-about .team-bar__seg {
    flex: none;
    height: 44px;
    justify-content: flex-start;
    padding-left: 14px;
  }

  .page-about .seg--a { width: 38%; }
  .page-about .seg--b { width: 16%; }
  .page-about .seg--c { width: 19%; }
  .page-about .seg--d { width: 27%; }

  .page-about .team-bar__tag {
    opacity: 1;
    transform: none;
    font-size: 10.5px;
    padding: 2px 8px;
  }
}

.page-about .team-legend {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 18px;
}

@media (min-width: 720px) {
  .page-about .team-legend {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .team-legend li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  color: var(--ink-soft);
}

.page-about .dot {
  flex: none;
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.page-about .dot--a { background: var(--grass); }
.page-about .dot--b { background: var(--field-bright); }
.page-about .dot--c { background: var(--amber); }
.page-about .dot--d { background: var(--blue); }

/* ---------- 04 发展历程 ---------- */
.page-about .milestones {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .milestone {
  position: relative;
  overflow: hidden;
  padding: 22px 22px 22px 32px;
  border-radius: var(--radius-l);
  border: 1px solid var(--line);
  background: var(--paper);
  box-shadow: var(--shadow-soft);
}

.page-about .milestone::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  background: linear-gradient(180deg, var(--field-bright), var(--orange));
  transition: width 0.3s ease;
}

.page-about .milestone:hover::before {
  width: 13px;
}

.page-about .milestone + .milestone {
  margin-top: 26px;
}

.page-about .milestone + .milestone::after {
  content: "";
  position: absolute;
  left: 26px;
  top: -26px;
  width: 2px;
  height: 26px;
  background: var(--line-strong);
}

.page-about .milestone__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .milestone__body h3 {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-size: 18.5px;
  line-height: 1.32;
  color: var(--stand-deep);
}

.page-about .milestone__body p {
  margin: 0;
  max-width: 52em;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--ink-soft);
}

/* ---------- 05 薪资结构课题 ---------- */
.page-about .salary-grid {
  display: grid;
  gap: 26px;
}

@media (min-width: 880px) {
  .page-about .salary-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 36px;
    align-items: start;
  }
}

.page-about .salary-copy p {
  margin: 0 0 16px;
  font-size: 16.5px;
  line-height: 1.88;
  color: var(--ink-soft);
}

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

.page-about .salary-figure {
  margin: 0;
  border-radius: var(--radius-l);
  overflow: hidden;
}

.page-about .salary-figure img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.8);
}

/* ---------- 06 合作生态 ---------- */
.page-about .partner-figure {
  margin: 0 0 26px;
  border-radius: var(--radius-l);
  overflow: hidden;
}

.page-about .partner-figure img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
  filter: saturate(0.72) brightness(1.02);
}

/* ---------- 07 我们服务谁 ---------- */
.page-about .coverage-grid {
  display: grid;
  gap: 16px;
}

@media (min-width: 720px) {
  .page-about .coverage-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

.page-about .coverage-card {
  display: flex;
  flex-direction: column;
  padding: 24px 22px;
  border-radius: var(--radius-l);
  border: 1px solid var(--line);
  background: var(--paper);
  box-shadow: var(--shadow-soft);
  transition: border-color 0.22s ease, box-shadow 0.22s ease;
}

.page-about .coverage-card:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-lift);
}

.page-about .coverage-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 17.5px;
  line-height: 1.34;
  color: var(--stand-deep);
}

.page-about .coverage-card p {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .coverage-link {
  margin-top: auto;
  align-self: flex-start;
  font-size: 14px;
  font-weight: 700;
  color: var(--grass);
  text-decoration: none;
  border-bottom: 2px solid rgba(255, 107, 0, 0.55);
  padding-bottom: 2px;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .coverage-link:hover,
.page-about .coverage-link:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

.page-about .coverage-foot {
  margin-top: 26px;
  padding: 20px 22px;
  border-radius: var(--radius-m);
  background: var(--mist);
  border-left: 4px solid var(--grass);
}

.page-about .coverage-foot p {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

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

/* ---------- 动效收敛 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .stand__pulse {
    animation: none;
  }

  .page-about .flowline__node,
  .page-about .milestone::before,
  .page-about .coverage-card,
  .page-about .team-bar__tag {
    transition: none;
  }
}

@media (max-width: 420px) {
  .page-about .fact__num {
    font-size: 22px;
  }

  .page-about .milestone {
    padding: 20px 18px 20px 26px;
  }
}
</main>