.page-about {
  --about-rail: 96px;
  background-color: var(--ink-950);
  color: var(--paper-050);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-block: 22px 6px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(40px, 6vw, 84px) clamp(56px, 7vw, 104px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--grid-overlay) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-overlay) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 78%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 78%);
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
}

.page-about .about-hero__title .eyebrow {
  margin: 0 0 20px;
}

.page-about .about-hero__title .display {
  margin: 0;
  max-width: 15ch;
}

.page-about .about-hero__body .lede {
  margin: 0;
  max-width: 58ch;
  color: var(--paper-050);
}

.page-about .about-hero__keys {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 20px 44px;
  margin: 32px 0 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--line-500);
}

.page-about .about-hero__keys li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-hero__keys .num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan-400);
  letter-spacing: 0.02em;
}

.page-about .about-hero__keys .muted {
  font-size: 12px;
  letter-spacing: 0.1em;
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: end;
    gap: clamp(48px, 6vw, 88px);
  }

  .page-about .about-hero__body {
    padding-left: 36px;
    border-left: 1px solid var(--line-500);
  }
}

/* ---------- 01 起点 ---------- */
.page-about .about-origin__head {
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .about-origin__head .eyebrow {
  margin: 0 0 14px;
}

.page-about .about-origin__head .h2 {
  margin: 0;
  max-width: 22ch;
}

.page-about .about-origin__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-origin__text p {
  margin: 0 0 22px;
  max-width: 64ch;
  font-size: 17px;
  line-height: 1.8;
  color: var(--paper-050);
}

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

.page-about .about-origin__aside {
  position: relative;
  padding: 30px 26px 30px 30px;
  border: 1px solid var(--line-500);
  background-color: var(--ink-850);
}

.page-about .about-origin__aside::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background-color: var(--orange-500);
}

.page-about .about-origin__quote {
  margin: 0;
  font-size: 19px;
  line-height: 1.7;
  color: var(--cyan-200);
}

@media (min-width: 900px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 64px;
    align-items: start;
  }
}

/* ---------- 02 成长路径 ---------- */
.page-about .about-path__head {
  margin-bottom: clamp(24px, 3vw, 40px);
}

.page-about .about-path__head .eyebrow {
  margin: 0 0 14px;
}

.page-about .about-path__head .h2 {
  margin: 0;
  max-width: 24ch;
}

.page-about .about-path__fig {
  margin: 0 0 clamp(40px, 5vw, 64px);
}

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

.page-about .tl__item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  padding-bottom: 44px;
}

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

.page-about .tl__side {
  display: flex;
  flex-direction: row;
  align-items: baseline;
  gap: 12px;
}

.page-about .tl__num {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--cyan-400);
}

.page-about .tl__dot {
  display: block;
  flex: none;
  width: 8px;
  height: 8px;
  background-color: var(--orange-500);
  transform: translateY(-1px);
}

.page-about .tl__v {
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--cyan-200);
  white-space: nowrap;
}

.page-about .tl__card {
  padding: 24px 22px;
  transition: border-color 0.16s var(--ease), transform 0.16s var(--ease);
}

.page-about .tl__card .h3 {
  margin: 0;
  color: var(--paper-050);
}

.page-about .tl__card p {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted-450);
}

.page-about .tl__more {
  margin-top: 18px;
  padding-left: 14px;
  border-left: 1px solid var(--line-500);
  font-size: 14px;
  line-height: 1.7;
  color: var(--cyan-200);
}

.page-about .tl__item:hover .tl__card,
.page-about .tl__item:focus-within .tl__card {
  border-color: var(--cyan-400);
  transform: translateY(-2px);
}

@media (min-width: 900px) {
  .page-about .tl__item {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 40px;
    padding-bottom: 76px;
  }

  .page-about .tl__item::before {
    content: "";
    position: absolute;
    left: calc(var(--about-rail) / 2 - 0.5px);
    top: 50px;
    bottom: 0;
    width: 1px;
    background-image: linear-gradient(180deg, var(--line-500), rgba(44, 74, 110, 0));
  }

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

  .page-about .tl__side {
    flex-direction: column;
    align-items: center;
    gap: 14px;
  }

  .page-about .tl__v {
    writing-mode: vertical-rl;
    letter-spacing: 0.32em;
    white-space: normal;
  }

  .page-about .tl__dot {
    width: 11px;
    height: 11px;
    background-color: var(--ink-950);
    border: 1px solid var(--cyan-400);
    transform: none;
    transition: background-color 0.16s var(--ease);
  }

  .page-about .tl__item:hover .tl__dot {
    background-color: var(--cyan-400);
  }

  .page-about .tl__item:nth-child(1) .tl__card {
    max-width: 560px;
  }

  .page-about .tl__item:nth-child(2) .tl__card {
    max-width: 720px;
  }

  .page-about .tl__item:nth-child(3) .tl__card {
    max-width: 900px;
  }
}

/* ---------- 03 团队与分工 ---------- */
.page-about .about-team__head {
  display: grid;
  gap: 20px;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .about-team__head .eyebrow {
  margin: 0 0 14px;
}

.page-about .about-team__head .h2 {
  margin: 0;
}

.page-about .about-team__intro {
  margin: 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted-450);
}

.page-about .about-team__grid {
  display: grid;
  gap: 18px;
}

.page-about .about-team__col {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 30px 22px 26px;
  border: 1px solid var(--line-500);
  background-color: var(--ink-850);
  transition: border-color 0.16s var(--ease), background-color 0.16s var(--ease);
}

.page-about .about-team__col::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 52px;
  height: 2px;
  background-color: var(--orange-500);
}

.page-about .about-team__col:hover {
  border-color: var(--cyan-400);
  background-color: var(--ink-750);
}

.page-about .about-team__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--muted-450);
}

.page-about .about-team__count {
  margin: 14px 0 10px;
  font-family: var(--font-mono);
  font-size: clamp(44px, 7vw, 62px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan-400);
}

.page-about .about-team__col .h3 {
  margin: 0;
  color: var(--paper-050);
}

.page-about .about-team__col > p {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted-450);
}

.page-about .about-team__list {
  list-style: none;
  margin: 20px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line-500);
  display: grid;
  gap: 9px;
}

.page-about .about-team__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted-450);
}

.page-about .about-team__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 7px;
  height: 1px;
  background-color: var(--cyan-400);
}

@media (min-width: 820px) {
  .page-about .about-team__head {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: 48px;
    align-items: end;
  }

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

/* ---------- 04 内容方法论 ---------- */
.page-about .about-method__head {
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-about .about-method__head .eyebrow {
  margin: 0 0 14px;
}

.page-about .about-method__head .h2 {
  margin: 0;
  max-width: 26ch;
}

.page-about .about-method__grid {
  display: grid;
  gap: 36px;
}

.page-about .about-method__fig {
  margin: 0;
}

.page-about .about-method__steps {
  display: grid;
}

.page-about .about-method__step {
  position: relative;
  padding: 0 0 30px 56px;
}

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

.page-about .about-method__step::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 44px;
  bottom: 0;
  width: 1px;
  background-color: var(--line-500);
}

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

.page-about .about-method__stepnum {
  position: absolute;
  left: 0;
  top: 0;
  display: grid;
  place-items: center;
  width: 37px;
  height: 37px;
  border: 1px solid var(--line-500);
  background-color: var(--ink-950);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--cyan-400);
}

.page-about .about-method__step .h3 {
  margin: 0 0 10px;
  color: var(--paper-050);
}

.page-about .about-method__step p {
  margin: 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted-450);
}

@media (min-width: 900px) {
  .page-about .about-method__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 64px;
    align-items: start;
  }
}

/* ---------- 05 覆盖与节奏 ---------- */
.page-about .about-cover__grid {
  display: grid;
  gap: 36px;
  align-items: center;
}

.page-about .about-cover__text .eyebrow {
  margin: 0 0 14px;
}

.page-about .about-cover__text .h2 {
  margin: 0 0 20px;
  max-width: 20ch;
}

.page-about .about-cover__text > p {
  margin: 0;
  max-width: 58ch;
  font-size: 17px;
  line-height: 1.8;
  color: var(--paper-050);
}

.page-about .about-cover__facts {
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background-color: var(--line-500);
  border: 1px solid var(--line-500);
}

.page-about .about-cover__fact {
  background-color: var(--ink-950);
  padding: 18px 20px;
}

.page-about .about-cover__fact dt {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--cyan-400);
}

.page-about .about-cover__fact dd {
  margin: 7px 0 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted-450);
}

.page-about .about-cover__fig {
  margin: 0;
}

@media (min-width: 640px) {
  .page-about .about-cover__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-cover__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 64px;
  }
}

/* ---------- 06 长期投入 ---------- */
.page-about .about-trust__head {
  display: grid;
  gap: 18px;
}

.page-about .about-trust__head .eyebrow {
  margin: 0 0 14px;
}

.page-about .about-trust__head .h2 {
  margin: 0;
  max-width: 20ch;
}

.page-about .about-trust__intro {
  margin: 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted-450);
}

.page-about .about-trust__grid {
  margin-top: clamp(28px, 4vw, 48px);
  display: grid;
  gap: 1px;
  background-color: var(--line-500);
  border: 1px solid var(--line-500);
}

.page-about .about-trust__cell {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 32px 24px;
  background-color: var(--ink-950);
  transition: background-color 0.16s var(--ease);
}

.page-about .about-trust__cell:hover {
  background-color: var(--ink-850);
}

.page-about .about-trust__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(38px, 5.4vw, 54px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan-400);
}

.page-about .about-trust__num--warm {
  color: var(--orange-500);
}

.page-about .about-trust__cell .h3 {
  margin: 0;
  color: var(--paper-050);
}

.page-about .about-trust__cell p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted-450);
}

@media (min-width: 820px) {
  .page-about .about-trust__head {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: 48px;
    align-items: end;
  }

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

/* ---------- 收束 ---------- */
.page-about .about-close {
  padding-block: clamp(56px, 8vw, 104px) clamp(64px, 9vw, 120px);
}

.page-about .about-close__inner {
  max-width: 760px;
  padding-top: 40px;
  border-top: 1px solid var(--line-500);
}

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

.page-about .about-close__lead {
  margin: 0 0 30px;
  font-size: 20px;
  line-height: 1.75;
  color: var(--paper-050);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__card,
  .page-about .tl__dot,
  .page-about .about-team__col,
  .page-about .about-trust__cell {
    transition: none;
  }

  .page-about .tl__item:hover .tl__card,
  .page-about .tl__item:focus-within .tl__card {
    transform: none;
  }
}
<<<END>>>