.page-about {
  --about-ink: var(--ink-800);
  --about-muted: #4A5C74;
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 30px) 0 clamp(34px, 5vw, 56px);
  background:
    radial-gradient(circle at 84% 16%, rgba(47, 240, 208, 0.13), transparent 58%),
    radial-gradient(circle at 8% 92%, rgba(255, 90, 43, 0.12), transparent 52%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(102deg, rgba(36, 64, 95, 0.42) 0 1px, transparent 1px 30px);
  opacity: 0.45;
  pointer-events: none;
}

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

.page-about .breadcrumbs {
  margin: 0 0 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.page-about .breadcrumbs__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
}

.page-about .breadcrumbs__item {
  display: inline-flex;
  align-items: center;
}

.page-about .breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  margin: 0 9px;
  color: var(--line);
}

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

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

.page-about .about-kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-title {
  margin: 0 0 20px;
  max-width: 19em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(32px, 5vw, 60px);
  line-height: 1.06;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .about-lede {
  margin: 0 0 28px;
  max-width: 56ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--steel);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
}

.page-about .about-hero__meta-item {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--white);
  border: 1px solid var(--line);
  background: rgba(11, 21, 36, 0.72);
  padding: 8px 13px;
  clip-path: polygon(0 0, calc(100% - var(--cut-sm)) 0, 100% var(--cut-sm), 100% 100%, 0 100%);
}

/* ---------- 正文双栏 ---------- */
.page-about .about-body {
  background: var(--paper);
  color: var(--about-ink);
  padding: clamp(42px, 6vw, 82px) 0 clamp(46px, 7vw, 92px);
}

.page-about .about-body__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: 0 0 clamp(34px, 4vw, 46px);
}

.page-about .about-chapter + .about-chapter {
  padding-top: 34px;
}

.page-about .about-chapter + .about-chapter::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 9px;
  background-image: repeating-linear-gradient(102deg, var(--paper-2) 0 1px, transparent 1px 9px);
  opacity: 0.9;
}

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

.page-about .about-chapter__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  margin-bottom: 16px;
}

.page-about .about-no {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--flame);
}

.page-about .about-chapter__title {
  flex: 1 1 auto;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 2.7vw, 34px);
  line-height: 1.16;
  letter-spacing: 0.01em;
  color: var(--ink-900);
}

.page-about .about-chip {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--teal);
  border: 1px solid var(--paper-2);
  padding: 4px 10px;
  white-space: nowrap;
}

.page-about .about-chapter__body p {
  margin: 0 0 15px;
  max-width: 68ch;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--about-ink);
}

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

.page-about .about-points {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.page-about .about-points li {
  position: relative;
  padding-left: 24px;
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--about-ink);
}

.page-about .about-points li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.62em;
  width: 8px;
  height: 8px;
  background: var(--flame);
  transform: rotate(45deg);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  position: relative;
  margin: 24px 0 26px;
  background: var(--ink-800);
  clip-path: polygon(0 var(--cut), var(--cut) 0, 100% 0, 100% 100%, 0 100%);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
}

.page-about .about-figure--wide img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--square {
  margin: 0;
  clip-path: polygon(0 0, calc(100% - var(--cut-lg)) 0, 100% var(--cut-lg), 100% 100%, 0 100%);
}

.page-about .about-figure--square img {
  aspect-ratio: 1 / 1;
}

/* ---------- 岗位筛选 ---------- */
.page-about .about-roles {
  margin-top: 6px;
}

.page-about .about-roles__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.page-about .about-tab {
  appearance: none;
  cursor: pointer;
  min-height: 44px;
  padding: 10px 15px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--about-ink);
  background: transparent;
  border: 1px solid var(--paper-2);
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-tab:hover {
  border-color: var(--teal);
}

.page-about .about-tab[aria-pressed="true"] {
  background: var(--ink-800);
  border-color: var(--ink-800);
  color: var(--cyan);
}

.page-about .about-tab:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

.page-about .about-roles__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 13px;
}

.page-about .about-role {
  border-left: 3px solid var(--flame);
  background: var(--paper-2);
  padding: 16px 18px 18px;
}

.page-about .about-role__top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 7px;
}

.page-about .about-role__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink-900);
}

.page-about .about-role__count {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--flame);
  letter-spacing: 0.04em;
}

.page-about .about-role p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--about-ink);
  max-width: 62ch;
}

.page-about .about-roles__empty {
  margin-top: 16px;
  padding: 18px;
  border: 1px dashed var(--paper-2);
}

.page-about .about-roles__empty[hidden] {
  display: none;
}

.page-about .about-roles__empty p {
  margin: 0 0 12px;
  font-size: 15px;
  color: var(--about-muted);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-rhythm {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .about-rhythm li {
  position: relative;
  padding: 15px 0 15px 24px;
  border-left: 1px solid var(--paper-2);
}

.page-about .about-rhythm li:first-child {
  padding-top: 4px;
}

.page-about .about-rhythm li:first-child::before {
  top: 12px;
}

.page-about .about-rhythm li::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 23px;
  width: 9px;
  height: 9px;
  background: var(--teal);
  transform: rotate(45deg);
}

.page-about .about-rhythm__time {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ink-900);
}

.page-about .about-rhythm p {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.7;
}

/* ---------- 演进阶段 ---------- */
.page-about .about-phases {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-phase {
  position: relative;
  padding: 20px 18px 22px;
  background: var(--paper-2);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 15px), calc(100% - 15px) 100%, 0 100%);
}

.page-about .about-phase__step {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--teal);
}

.page-about .about-phase__name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink-900);
}

.page-about .about-phase p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--about-ink);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 24px;
  margin-top: 22px;
}

.page-about .about-partners__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-partners__list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 10px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--paper-2);
}

.page-about .about-partners__list li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .about-partners__num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 40px;
  line-height: 0.95;
  color: var(--flame);
}

.page-about .about-partners__unit {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--about-muted);
}

.page-about .about-partners__desc {
  flex-basis: 100%;
  margin: 0;
  font-size: 15px;
  line-height: 1.68;
  color: var(--about-ink);
}

/* ---------- 侧栏 ---------- */
.page-about .about-side {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .about-side__panel {
  background: var(--ink-800);
  color: var(--white);
  padding: 20px 18px 22px;
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.page-about .about-side__label {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-metrics {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-metric {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 5px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-metric:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .about-metric__value {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 34px;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-metric__unit {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-metric__label {
  flex-basis: 100%;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--steel);
}

.page-about .about-side__nav {
  display: grid;
  gap: 2px;
}

.page-about .about-side__link {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 8px 8px 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--steel);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-side__link:hover,
.page-about .about-side__link:focus-visible {
  color: var(--cyan);
  border-left-color: var(--cyan);
  outline: none;
}

/* ---------- 结尾指引 ---------- */
.page-about .about-next {
  position: relative;
  overflow: hidden;
  background: var(--ink-900);
  color: var(--white);
  padding: clamp(42px, 6vw, 74px) 0 clamp(38px, 5vw, 62px);
}

.page-about .about-next::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(102deg, rgba(36, 64, 95, 0.36) 0 1px, transparent 1px 26px);
  opacity: 0.4;
  pointer-events: none;
}

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

.page-about .about-next__kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .about-next__title {
  margin: 0 0 28px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3.2vw, 40px);
  line-height: 1.14;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .about-next__grid {
  display: grid;
  gap: 14px;
}

.page-about .about-next__card {
  display: block;
  padding: 20px 18px 22px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  text-decoration: none;
  color: var(--white);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: border-color 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  border-color: var(--cyan);
  transform: translateY(-3px);
  outline: none;
}

.page-about .about-next__no {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-next__card h3 {
  margin: 0 0 9px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .about-next__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .about-next__contact {
  margin: 26px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.9;
  letter-spacing: 0.03em;
  color: var(--steel);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-next__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-roles__list {
    gap: 15px;
  }
}

@media (min-width: 760px) {
  .page-about .about-phases {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-phase:nth-child(2),
  .page-about .about-phase:nth-child(4) {
    transform: translateY(20px);
  }

  .page-about .about-partners {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
    gap: 28px;
  }

  .page-about .about-partners__list {
    margin-top: 0;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body__grid {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 54px;
    align-items: start;
  }

  .page-about .about-side {
    position: sticky;
    top: calc(var(--header-h) + 26px);
  }

  .page-about .about-hero__inner {
    max-width: 1000px;
  }
}

@media (min-width: 1240px) {
  .page-about .about-next__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
<<<END>>>