.page-about {
  --about-line: rgba(154, 161, 174, .22);
  --about-line-soft: rgba(154, 161, 174, .1);
  --about-cyan-glow: rgba(25, 242, 212, .5);
  color: var(--ink);
  background: var(--black-900);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(40px, 7vw, 96px) 0 clamp(36px, 5vw, 76px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -12% auto -12%;
  height: 130%;
  background:
    radial-gradient(56% 58% at 16% 10%, rgba(180, 18, 31, .32), transparent 70%),
    radial-gradient(40% 48% at 84% 2%, rgba(25, 242, 212, .11), transparent 72%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero > .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .wrap::before {
  content: "";
  display: block;
  height: 11px;
  margin-bottom: clamp(20px, 3vw, 34px);
  border-top: 1px solid var(--about-line);
  background-image: repeating-linear-gradient(90deg, var(--about-line) 0 1px, transparent 1px 25px);
}

.page-about .crumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--slate);
  text-transform: uppercase;
}

.page-about .crumb a {
  color: var(--slate);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

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

.page-about .kicker {
  margin: clamp(26px, 4vw, 46px) 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--slate);
}

.page-about .about-title {
  margin: 14px 0 0;
  max-width: 16ch;
  font-size: clamp(32px, 6.2vw, 78px);
  font-weight: 200;
  line-height: 1.14;
  letter-spacing: -.02em;
}

.page-about .about-title em {
  font-style: normal;
  font-weight: 900;
  color: var(--cyan);
}

.page-about .about-lead {
  margin: clamp(22px, 3vw, 34px) 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--slate);
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  margin: clamp(32px, 5vw, 58px) 0 0;
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .hero-fact {
  padding: clamp(16px, 2.4vw, 26px) clamp(12px, 1.8vw, 24px);
  border-left: 1px solid var(--about-line);
}

.page-about .hero-fact:first-child {
  border-left: 0;
  padding-left: 0;
}

.page-about .hero-fact dt {
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--slate);
}

.page-about .hero-fact-num {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(20px, 3vw, 34px);
  line-height: 1.15;
  color: var(--paper);
  white-space: nowrap;
}

/* ---------- 章节标题 ---------- */
.page-about .sec-head {
  position: relative;
  padding-left: clamp(42px, 6vw, 76px);
  padding-bottom: clamp(18px, 2.6vw, 30px);
  margin-bottom: clamp(26px, 4vw, 50px);
  border-bottom: 1px solid var(--about-line);
}

.page-about .sec-idx {
  position: absolute;
  left: 0;
  top: .12em;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.8vw, 34px);
  letter-spacing: -.02em;
  color: var(--cyan);
  opacity: .85;
}

.page-about .sec-title {
  margin: 0;
  font-size: clamp(23px, 3.5vw, 42px);
  font-weight: 200;
  line-height: 1.28;
  letter-spacing: -.01em;
}

.page-about .sec-note {
  margin: .7em 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 01 时间线 ---------- */
.page-about .tl-figure {
  margin: 0 0 clamp(34px, 5vw, 62px);
  position: relative;
  aspect-ratio: 16 / 6;
  border: 1px solid var(--about-line);
  overflow: hidden;
}

.page-about .tl-figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.8) brightness(.72);
}

.page-about .tl-figure .media__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  margin: 0;
  padding: 8px 14px;
  background: rgba(10, 11, 15, .78);
  border-top: 1px solid var(--about-line);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--slate);
}

.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .tl-node {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  border-top: 1px solid var(--about-line);
  padding: clamp(20px, 3vw, 34px) 0 clamp(20px, 3vw, 34px) clamp(28px, 4.4vw, 56px);
}

.page-about .tl-node::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--about-line-soft);
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: calc(clamp(20px, 3vw, 34px) + 14px);
  width: 9px;
  height: 9px;
  background: var(--cyan);
  box-shadow: 0 0 10px var(--about-cyan-glow);
}

.page-about .tl-year {
  display: block;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(21px, 3vw, 36px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .tl-btn {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  width: 100%;
  padding: 0;
  margin: 0;
  border: 0;
  background: none;
  font: inherit;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
}

.page-about .tl-btn:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}

.page-about .tl-title {
  font-size: clamp(17px, 2.2vw, 24px);
  font-weight: 500;
  line-height: 1.4;
  transition: color var(--dur) var(--ease);
}

.page-about .tl-btn:hover .tl-title,
.page-about .tl-btn[aria-expanded="true"] .tl-title {
  color: var(--crimson-glow);
}

.page-about .tl-hint {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--slate);
}

.page-about .tl-desc {
  margin: 12px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate);
}

.page-about .tl-main .acc-inner {
  padding-top: 12px;
  max-width: 64ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--slate);
  border-left: 1px solid var(--cyan);
  padding-left: 16px;
}

.page-about .tl-main .acc-inner p {
  margin: 0;
}

/* ---------- 02 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .team-lead {
  margin: 0;
  max-width: 56ch;
  font-size: clamp(16px, 1.7vw, 19px);
  line-height: 1.8;
  color: var(--ink);
}

.page-about .team-bars {
  list-style: none;
  margin: clamp(26px, 3.6vw, 42px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 2.4vw, 28px);
}

.page-about .team-bar {
  padding-top: clamp(14px, 2vw, 20px);
  border-top: 1px solid var(--about-line-soft);
}

.page-about .bar-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
}

.page-about .bar-name {
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
  transition: color var(--dur) var(--ease);
}

.page-about .bar-count {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(18px, 2.4vw, 26px);
  color: var(--paper);
}

.page-about .bar-track {
  display: block;
  height: 6px;
  margin-top: 12px;
  background: rgba(154, 161, 174, .13);
  overflow: hidden;
}

.page-about .bar-fill {
  display: block;
  height: 100%;
  width: 0;
  transition: width .7s var(--ease);
}

.page-about .team-bar:nth-child(1) .bar-fill {
  width: 44%;
  background: var(--cyan);
}

.page-about .team-bar:nth-child(2) .bar-fill {
  width: 35%;
  background: var(--crimson-glow);
}

.page-about .team-bar:nth-child(3) .bar-fill {
  width: 21%;
  background: var(--slate);
}

.page-about .team-bar:hover .bar-name {
  color: var(--cyan);
}

.page-about .bar-desc {
  display: block;
  margin-top: 12px;
  max-width: 46ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--slate);
}

.page-about .team-figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--about-line);
  overflow: hidden;
}

.page-about .team-figure::before,
.page-about .team-figure::after {
  content: "";
  position: absolute;
  width: 22px;
  height: 22px;
  border: 1px solid var(--cyan);
  pointer-events: none;
}

.page-about .team-figure::before {
  top: 10px;
  left: 10px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .team-figure::after {
  bottom: 10px;
  right: 10px;
  border-left: 0;
  border-top: 0;
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  filter: grayscale(.28) brightness(.74) contrast(1.06);
}

.page-about .team-figure .media__cap {
  display: block;
  padding: 10px 14px;
  border-top: 1px solid var(--about-line);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .05em;
  color: var(--slate);
  background: var(--black-700);
}

/* ---------- 03 校对流程 ---------- */
.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.4vw, 44px);
}

.page-about .flow-step {
  position: relative;
  padding-left: 26px;
}

.page-about .flow-step::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 16px;
  bottom: -24px;
  width: 1px;
  background: var(--about-line-soft);
}

.page-about .flow-step:last-child::before {
  display: none;
}

.page-about .flow-dot {
  position: absolute;
  left: 0;
  top: 4px;
  width: 11px;
  height: 11px;
  background: var(--cyan);
  box-shadow: 0 0 12px var(--about-cyan-glow);
}

.page-about .flow-idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--slate);
}

.page-about .flow-title {
  margin: 10px 0 0;
  font-size: clamp(16px, 2vw, 20px);
  font-weight: 500;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .flow-desc {
  margin: 10px 0 0;
  max-width: 44ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 04 覆盖范围 ---------- */
.page-about .reach-figure {
  position: relative;
  margin: 0 0 clamp(24px, 3.4vw, 42px);
  border: 1px solid var(--about-line);
  overflow: hidden;
}

.page-about .reach-figure img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(.9) brightness(.8);
}

.page-about .reach-figure .media__cap {
  position: absolute;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 8px 14px;
  background: rgba(10, 11, 15, .78);
  border-top: 1px solid var(--about-line);
  border-left: 1px solid var(--about-line);
  font-size: 12px;
  color: var(--slate);
}

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

.page-about .reach-stat {
  background: var(--black-900);
  padding: clamp(18px, 2.4vw, 28px) clamp(16px, 2vw, 24px);
}

.page-about .reach-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(26px, 4vw, 46px);
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .reach-label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .reach-note {
  margin: clamp(20px, 3vw, 32px) 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate);
}

/* ---------- 05 年度观察 ---------- */
.page-about .annual-panel {
  position: relative;
  padding: clamp(28px, 4.4vw, 60px) clamp(22px, 3.4vw, 52px);
  border: 1px solid var(--about-line);
  background:
    radial-gradient(70% 120% at 0% 0%, rgba(110, 10, 24, .5), transparent 62%),
    radial-gradient(50% 90% at 100% 100%, rgba(25, 242, 212, .07), transparent 68%),
    var(--black-700);
}

.page-about .annual-panel::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: clamp(56px, 9vw, 120px);
  height: 2px;
  background: var(--cyan);
}

.page-about .annual-kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .annual-title {
  margin: 14px 0 0;
  font-size: clamp(22px, 3.2vw, 38px);
  font-weight: 200;
  line-height: 1.28;
  letter-spacing: -.01em;
}

.page-about .annual-body {
  margin: 16px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate);
}

.page-about .annual-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

/* ---------- 06 与我们共事 ---------- */
.page-about .work-entries {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .work-entry {
  position: relative;
  background: var(--black-900);
  padding: clamp(22px, 3vw, 36px) clamp(18px, 2.4vw, 30px);
}

.page-about .work-idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--crimson-glow);
}

.page-about .work-title {
  margin: 12px 0 0;
  font-size: clamp(17px, 2.2vw, 22px);
  font-weight: 500;
  line-height: 1.42;
  color: var(--ink);
}

.page-about .work-desc {
  margin: 12px 0 0;
  max-width: 40ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .work-entry .btn {
  margin-top: 20px;
}

.page-about .work-ask {
  margin-top: clamp(38px, 5.5vw, 72px);
}

.page-about .work-ask-title {
  margin: 0 0 clamp(16px, 2.4vw, 26px);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--about-line);
  font-size: clamp(17px, 2.2vw, 22px);
  font-weight: 500;
  color: var(--ink);
}

.page-about .ask-btn {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  width: 100%;
  padding: clamp(16px, 2.2vw, 22px) 0 clamp(16px, 2.2vw, 22px) 22px;
  border: 0;
  border-top: 1px solid var(--about-line-soft);
  background: none;
  font: inherit;
  font-size: clamp(15px, 1.7vw, 17px);
  font-weight: 500;
  line-height: 1.6;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
  position: relative;
  transition: color var(--dur) var(--ease);
}

.page-about .ask-btn::before {
  content: "";
  position: absolute;
  left: 0;
  top: calc(clamp(16px, 2.2vw, 22px) + 9px);
  width: 8px;
  height: 8px;
  border: 1px solid var(--cyan);
  transition: background var(--dur) var(--ease);
}

.page-about .ask-btn[aria-expanded="true"] {
  color: var(--cyan);
}

.page-about .ask-btn[aria-expanded="true"]::before {
  background: var(--cyan);
}

.page-about .ask-btn:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}

.page-about .work-ask .acc-inner {
  padding: 0 0 20px 22px;
  max-width: 68ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--slate);
}

.page-about .work-ask .acc-inner p {
  margin: 0;
}

.page-about .work-ask .acc-inner a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(25, 242, 212, .4);
}

.page-about .work-ask .acc-inner a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .work-ask .acc-item:last-child .acc-btn {
  border-bottom: 1px solid var(--about-line-soft);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .tl-node {
    grid-template-columns: clamp(92px, 11vw, 142px) minmax(0, 1fr);
    gap: 0 clamp(20px, 3vw, 48px);
    align-items: start;
  }

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

  .page-about .flow-step {
    padding-left: 0;
    padding-right: clamp(14px, 2vw, 28px);
    padding-top: 30px;
    border-top: 1px solid var(--about-line);
  }

  .page-about .flow-step::before {
    left: 5px;
    top: 0;
    bottom: auto;
    width: 100%;
    height: 1px;
    background: var(--about-line-soft);
  }

  .page-about .flow-dot {
    top: 8px;
    left: 0;
  }

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

@media (min-width: 900px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
  }

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

  .page-about .reach-note {
    margin-left: auto;
    margin-right: 0;
    max-width: 52ch;
  }
}

@media (max-width: 559px) {
  .page-about .hero-facts {
    grid-template-columns: 1fr;
  }

  .page-about .hero-fact {
    border-left: 0;
    border-top: 1px solid var(--about-line);
    padding-left: 0;
    padding-right: 0;
  }

  .page-about .hero-fact:first-child {
    border-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .bar-fill,
  .page-about .tl-title,
  .page-about .bar-name,
  .page-about .ask-btn,
  .page-about .ask-btn::before,
  .page-about .crumb a {
    transition: none;
  }
}
<<<END>>>