.page-about {
  --about-rail: 288px;
  --about-ink: #121417;
  background: var(--hf-white);
  color: var(--about-ink);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  background: var(--hf-navy);
  color: var(--hf-white);
  padding: clamp(18px, 3vw, 28px) 0 clamp(40px, 6vw, 78px);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -12%;
  right: -8%;
  width: min(400px, 48vw);
  height: 66%;
  background: var(--hf-red);
  clip-path: polygon(42% 0, 100% 0, 100% 100%, 0 100%);
  opacity: 0.94;
  z-index: 0;
  pointer-events: none;
}

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

.page-about .about-hero__crumbs {
  color: var(--hf-muted);
}

.page-about .about-hero__crumbs a {
  color: var(--hf-muted);
  text-decoration: none;
}

.page-about .about-hero__crumbs a:hover {
  color: var(--hf-white);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  margin-top: clamp(20px, 3vw, 36px);
}

.page-about .about-hero__eyebrow {
  color: var(--hf-red);
}

.page-about .about-hero__title {
  margin: 10px 0 0;
  color: var(--hf-white);
  line-height: 1.16;
  max-width: 22ch;
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.55vw, 17px);
  line-height: 1.8;
  color: rgba(247, 245, 240, 0.84);
}

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

/* 概况看板 */
.page-about .about-board {
  background: var(--hf-navy-deep);
  border: 1px solid rgba(147, 161, 176, 0.3);
  padding: clamp(16px, 2.2vw, 24px);
}

.page-about .about-board__cap {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--hf-red);
}

.page-about .about-board__item {
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 10px;
  row-gap: 4px;
  align-items: baseline;
  padding: 13px 0;
  border-bottom: 1px solid rgba(147, 161, 176, 0.2);
}

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

.page-about .about-board__value {
  font-family: var(--hf-font-mono);
  font-size: clamp(26px, 3.4vw, 36px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--hf-white);
}

.page-about .about-board__value em {
  font-style: normal;
  font-size: 0.45em;
  margin-left: 2px;
  color: var(--hf-muted);
}

.page-about .about-board__label {
  font-size: 14px;
  color: var(--hf-muted);
}

.page-about .about-board__note {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(147, 161, 176, 0.88);
}

/* ---------- 通用区块 ---------- */
.page-about .about-block {
  padding: clamp(44px, 6.4vw, 88px) 0;
  border-top: 1px solid var(--hf-line-light);
}

.page-about .about-block--dark {
  background: var(--hf-navy);
  color: var(--hf-white);
  border-top: 0;
}

.page-about .about-block--slate {
  background: var(--hf-slate);
  color: var(--hf-white);
  border-top: 0;
}

.page-about .about-editorial {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 40px);
}

.page-about .about-editorial__main {
  min-width: 0;
  max-width: 68ch;
}

/* ---------- 章节标题 ---------- */
.page-about .about-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 14px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--hf-line-light);
}

.page-about .about-head--free {
  max-width: 62ch;
}

.page-about .about-head__no {
  flex: none;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--hf-red);
}

.page-about .about-head__title {
  margin: 0;
  font-family: var(--hf-font-serif);
  font-weight: 600;
  font-size: clamp(21px, 2.9vw, 32px);
  line-height: 1.32;
  color: var(--about-ink);
}

.page-about .about-block--dark .about-head__title,
.page-about .about-block--slate .about-head__title {
  color: var(--hf-white);
}

.page-about .about-block--dark .about-head,
.page-about .about-block--slate .about-head {
  border-bottom-color: rgba(147, 161, 176, 0.26);
}

.page-about .about-block--dark .hf-p,
.page-about .about-block--slate .hf-p {
  color: rgba(247, 245, 240, 0.84);
}

.page-about .about-block--dark .hf-p + .hf-p,
.page-about .about-block--slate .hf-p + .hf-p {
  margin-top: 16px;
}

/* ---------- 旁注栏 ---------- */
.page-about .about-editorial__side {
  min-width: 0;
}

.page-about .about-side__cap {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--hf-red);
}

.page-about .about-side__text {
  margin: 0;
  font-family: var(--hf-font-serif);
  font-size: 15px;
  line-height: 1.75;
  color: var(--hf-dim);
  border-left: 2px solid var(--hf-red);
  padding-left: 14px;
}

.page-about .about-side__media {
  margin: 0 0 18px;
}

.page-about .about-side__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--hf-line-light);
}

.page-about .about-side__facts li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 0;
  font-size: 14px;
  color: var(--hf-dim);
  border-bottom: 1px solid var(--hf-line-light);
}

.page-about .about-side__facts span {
  font-size: 20px;
  color: var(--about-ink);
}

/* ---------- 三条做法 ---------- */
.page-about .about-tenets {
  list-style: none;
  counter-reset: tenet;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-tenet {
  position: relative;
  padding: 0 0 22px 30px;
  border-left: 1px solid var(--hf-line-light);
}

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

.page-about .about-tenet::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  background: var(--hf-red);
  transform: rotate(45deg);
}

.page-about .about-tenet__title {
  margin: 0 0 6px;
  font-size: clamp(16px, 1.8vw, 19px);
  font-weight: 700;
  color: var(--about-ink);
}

.page-about .about-tenet__body {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--hf-dim);
}

/* ---------- 三件事 ---------- */
.page-about .about-jobs__lede {
  max-width: 62ch;
  color: var(--hf-dim);
}

.page-about .about-jobs {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 30px;
  background: var(--hf-line-light);
  border: 1px solid var(--hf-line-light);
}

.page-about .about-job {
  background: var(--hf-white);
  padding: clamp(20px, 2.6vw, 30px);
  border-top: 3px solid transparent;
  transition: border-color 180ms ease, background-color 180ms ease;
}

.page-about .about-job:hover {
  border-top-color: var(--hf-red);
  background: #fdfcf9;
}

.page-about .about-job__idx {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--hf-muted);
}

.page-about .about-job__title {
  margin: 12px 0 10px;
  font-family: var(--hf-font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.4vw, 26px);
  letter-spacing: -0.01em;
  color: var(--about-ink);
}

.page-about .about-job__body {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--hf-dim);
}

.page-about .about-job__scene {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--hf-line-light);
  font-size: 13px;
  line-height: 1.7;
  color: var(--hf-red);
}

/* ---------- 数据流程 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(24px, 3.4vw, 40px);
}

.page-about .about-block--dark .hf-media__caption {
  color: rgba(147, 161, 176, 0.9);
}

.page-about .about-flowwrap {
  overflow-x: auto;
  padding-bottom: 4px;
}

.page-about .about-flow {
  display: block;
  width: 100%;
  min-width: 620px;
  height: auto;
}

.page-about .about-flow__box {
  fill: rgba(247, 245, 240, 0.03);
  stroke: rgba(147, 161, 176, 0.3);
  stroke-width: 1;
}

.page-about .about-flow__num {
  fill: var(--hf-red);
  font-family: var(--hf-font-mono);
  font-size: 15px;
  letter-spacing: 0.14em;
}

.page-about .about-flow__name {
  fill: var(--hf-white);
  font-family: var(--hf-font-body);
  font-size: 19px;
  font-weight: 700;
}

.page-about .about-flow__desc {
  fill: var(--hf-muted);
  font-family: var(--hf-font-body);
  font-size: 13px;
}

.page-about .about-grid2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(26px, 3.4vw, 42px);
  background: rgba(147, 161, 176, 0.26);
  border-top: 1px solid rgba(147, 161, 176, 0.26);
}

.page-about .about-grid2__cell {
  background: var(--hf-navy);
  padding: clamp(20px, 2.4vw, 28px) 0 0;
}

.page-about .about-grid2__title {
  margin: 0 0 10px;
  font-size: clamp(16px, 1.8vw, 19px);
  font-weight: 700;
  color: var(--hf-white);
}

.page-about .about-grid2__body {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(247, 245, 240, 0.8);
}

/* ---------- 时间线 ---------- */
.page-about .about-band {
  margin: 0 0 clamp(30px, 4vw, 52px);
  overflow: hidden;
}

.page-about .about-band img {
  display: block;
  width: 100%;
  height: clamp(130px, 20vw, 240px);
  object-fit: cover;
  filter: saturate(0.72) contrast(1.04);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  max-width: 78ch;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--hf-line-light);
}

.page-about .about-timeline__row {
  position: relative;
  padding: 0 0 clamp(26px, 3.4vw, 40px) 30px;
}

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

.page-about .about-timeline__row::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 11px;
  height: 11px;
  background: var(--hf-white);
  border: 1px solid var(--hf-red);
  transform: rotate(45deg);
}

.page-about .about-timeline__stage {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--hf-red);
}

.page-about .about-timeline__title {
  margin: 8px 0 8px;
  font-family: var(--hf-font-serif);
  font-weight: 600;
  font-size: clamp(18px, 2.1vw, 23px);
  line-height: 1.4;
  color: var(--about-ink);
}

.page-about .about-timeline__body {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--hf-dim);
}

/* ---------- 人群 ---------- */
.page-about .about-aud__lede {
  max-width: 64ch;
}

.page-about .about-aud {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 1.8vw, 20px);
  margin-top: 30px;
}

.page-about .about-aud__item {
  border: 1px solid rgba(147, 161, 176, 0.32);
  padding: clamp(18px, 2.3vw, 26px);
  background: rgba(247, 245, 240, 0.03);
}

.page-about .about-aud__title {
  margin: 0 0 10px;
  font-size: clamp(16px, 1.9vw, 20px);
  font-weight: 700;
  color: var(--hf-white);
}

.page-about .about-aud__body {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(247, 245, 240, 0.8);
}

/* ---------- 长期标准 ---------- */
.page-about .about-standards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 30px;
  background: var(--hf-line-light);
  border: 1px solid var(--hf-line-light);
}

.page-about .about-standards__cell {
  background: var(--hf-white);
  padding: clamp(18px, 2.2vw, 24px);
}

.page-about .about-standards__num {
  margin: 0 0 8px;
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--hf-red);
}

.page-about .about-standards__num em {
  font-style: normal;
  font-size: 0.44em;
  margin-left: 3px;
  color: var(--hf-dim);
}

.page-about .about-standards__label {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--hf-dim);
}

/* ---------- 收口 ---------- */
.page-about .about-cta {
  background: var(--hf-navy);
  color: var(--hf-white);
  padding: clamp(36px, 5vw, 64px) 0;
}

.page-about .about-cta__title {
  margin: 0 0 clamp(20px, 2.6vw, 30px);
  font-weight: 600;
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1.36;
  color: var(--hf-white);
  max-width: 30ch;
}

.page-about .about-cta__links {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: rgba(147, 161, 176, 0.26);
  border-top: 1px solid rgba(147, 161, 176, 0.26);
  border-bottom: 1px solid rgba(147, 161, 176, 0.26);
}

.page-about .about-cta__link {
  display: block;
  background: var(--hf-navy);
  padding: 20px 4px;
  text-decoration: none;
  transition: background-color 180ms ease;
}

.page-about .about-cta__link:hover {
  background: var(--hf-slate);
}

.page-about .about-cta__name {
  display: block;
  font-family: var(--hf-font-display);
  font-weight: 800;
  font-size: clamp(16px, 1.9vw, 19px);
  letter-spacing: -0.01em;
  color: var(--hf-white);
}

.page-about .about-cta__link:hover .about-cta__name {
  color: var(--hf-red);
}

.page-about .about-cta__desc {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(147, 161, 176, 0.92);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-jobs,
  .page-about .about-aud,
  .page-about .about-standards,
  .page-about .about-grid2,
  .page-about .about-cta__links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(280px, 0.8fr);
    align-items: end;
  }

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

  .page-about .about-grid2 {
    gap: clamp(24px, 3vw, 40px);
    background: transparent;
    border-top: 0;
  }

  .page-about .about-grid2__cell {
    padding-top: 0;
  }
}

@media (min-width: 1024px) {
  .page-about .about-editorial {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(32px, 4.4vw, 64px);
  }

  .page-about .about-editorial__side {
    order: -1;
  }
}

@media (max-width: 639px) {
  .page-about .about-hero::after {
    width: 58vw;
    height: 46%;
    opacity: 0.85;
  }

  .page-about .about-head {
    gap: 10px;
  }

  .page-about .about-flow {
    min-width: 560px;
  }
}

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