.page-about {
  background: var(--ink);
  color: var(--fog);
  overflow-x: clip;
}

.page-about [data-section] {
  scroll-margin-top: calc(var(--topbar-h) + 20px);
}

.page-about .breadcrumb {
  padding-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: 30px 0 48px;
  background:
    radial-gradient(90% 70% at 90% 4%, rgba(56, 242, 192, 0.16), transparent 62%),
    linear-gradient(180deg, #081813 0%, var(--ink) 80%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: 0;
  top: -14%;
  right: -30%;
  width: 80vw;
  max-width: 560px;
  height: 132%;
  background: linear-gradient(150deg, rgba(23, 72, 58, 0.9), rgba(6, 18, 15, 0) 72%);
  clip-path: polygon(28% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

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

.page-about .about-hero h1 {
  margin: 16px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(30px, 8.6vw, 52px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  max-width: 15em;
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--fog);
  opacity: 0.86;
}

.page-about .about-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

/* ---------- 我们为什么做 ---------- */
.page-about .about-why {
  padding: 52px 0 56px;
}

.page-about .about-why__inner {
  display: grid;
  gap: 30px;
}

.page-about .about-why__text p {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--fog);
  opacity: 0.88;
}

.page-about .about-why__note {
  border-top: 1px solid var(--line);
  padding-top: 20px;
}

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

.page-about .about-why__times {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .about-why__times li {
  padding: 12px 0;
  border-bottom: 1px solid rgba(23, 72, 58, 0.6);
  font-size: 14px;
  line-height: 1.7;
  color: var(--mute);
}

.page-about .about-why__times li span {
  display: block;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--mint);
}

/* ---------- 三件长期在做的事 ---------- */
.page-about .about-doing {
  position: relative;
  padding: 76px 0 64px;
  background: linear-gradient(175deg, #0e2a22 0%, #0a1e19 55%, var(--ink) 100%);
  clip-path: polygon(0 28px, 100% 0, 100% 100%, 0 100%);
}

.page-about .about-doing__grid {
  margin-top: 32px;
  border-top: 1px solid var(--line);
}

.page-about .about-doing__item {
  border-bottom: 1px solid var(--line);
}

.page-about .about-doing__item summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 20px 0;
  cursor: pointer;
  list-style: none;
}

.page-about .about-doing__item summary::-webkit-details-marker {
  display: none;
}

.page-about .about-doing__item summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--mint);
}

.page-about .about-doing__item[open] summary::after {
  content: "−";
}

.page-about .about-doing__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mint);
}

.page-about .about-doing__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.4;
  color: var(--fog);
}

.page-about .about-doing__body p {
  margin: 0 0 22px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mute);
  max-width: 34em;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: 60px 0 64px;
}

.page-about .about-team__inner {
  display: grid;
  gap: 28px;
}

.page-about .about-team__figure {
  margin: 0;
  overflow: hidden;
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-team__text > p {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--fog);
  opacity: 0.88;
  max-width: 34em;
}

.page-about .about-team__list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-team__list li {
  border-left: 2px solid var(--line);
  padding-left: 14px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mute);
}

.page-about .about-team__k {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mint);
}

/* ---------- 时间轴 ---------- */
.page-about .about-time {
  position: relative;
  padding: 56px 0 64px;
  overflow: hidden;
}

.page-about .about-time__track {
  position: relative;
  margin-top: 34px;
}

.page-about .about-time__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.2;
  filter: saturate(0.65);
  z-index: 0;
  pointer-events: none;
}

.page-about .about-time__list {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-time__list::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 18px;
  left: 7px;
  width: 1px;
  background: linear-gradient(180deg, var(--mint), var(--line) 62%, transparent);
}

.page-about .about-time__node {
  position: relative;
  padding: 0 0 34px 32px;
}

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

.page-about .about-time__dot {
  position: absolute;
  left: 0;
  top: 5px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1.5px solid var(--mint);
  background: var(--ink);
  transition: box-shadow 240ms var(--ease), background-color 240ms var(--ease);
}

.page-about .about-time__node.is-done .about-time__dot {
  background: var(--mint);
}

.page-about .about-time__node.is-now .about-time__dot {
  background: var(--flame);
  border-color: var(--flame);
  box-shadow: 0 0 0 4px rgba(255, 90, 54, 0.16);
}

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

.page-about .about-time__node h3 {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--fog);
}

.page-about .about-time__tip {
  margin: 8px 0 0;
  max-width: 30em;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mute);
  transition: color 240ms var(--ease);
}

/* ---------- 本地根基 ---------- */
.page-about .about-local {
  padding: 56px 0 64px;
}

.page-about .about-local__figure {
  margin: 0 0 28px;
  overflow: hidden;
}

.page-about .about-local__figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-local__text > p {
  margin: 16px 0 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--fog);
  opacity: 0.88;
}

/* ---------- 收尾 ---------- */
.page-about .about-next {
  padding: 8px 0 72px;
}

.page-about .about-next__inner {
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(23, 72, 58, 0.55), rgba(6, 18, 15, 0.92));
  padding: 28px 20px 32px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .about-next__inner h2 {
  margin: 0;
  font-family: var(--font-head);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--fog);
}

.page-about .about-next__inner p {
  margin: 12px 0 0;
  max-width: 34em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mute);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 860px) {
  .page-about .breadcrumb {
    padding-top: 26px;
  }

  .page-about .about-hero {
    padding: 56px 0 84px;
  }

  .page-about .about-hero::before {
    top: -26%;
    right: -12%;
    width: 46%;
    height: 152%;
  }

  .page-about .about-hero__lede {
    font-size: 16px;
  }

  .page-about .about-why {
    padding: 76px 0 84px;
  }

  .page-about .about-why__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 64px;
    align-items: start;
  }

  .page-about .about-why__text p {
    font-size: 16px;
  }

  .page-about .about-why__note {
    border-top: 0;
    border-left: 1px solid var(--line);
    padding: 4px 0 0 26px;
  }

  .page-about .about-doing {
    padding: 104px 0 88px;
    clip-path: polygon(0 56px, 100% 0, 100% 100%, 0 100%);
  }

  .page-about .about-doing__grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 44px;
    border-top: 0;
    margin-top: 44px;
  }

  .page-about .about-doing__item {
    border-bottom: 0;
    border-top: 1px solid var(--line);
    padding-top: 18px;
  }

  .page-about .about-doing__item summary {
    padding: 0 0 10px;
    cursor: default;
    pointer-events: none;
  }

  .page-about .about-doing__item summary::after {
    display: none;
  }

  .page-about .about-doing__item > .about-doing__body {
    display: block;
  }

  .page-about .about-doing__body p {
    margin-bottom: 0;
    font-size: 15px;
  }

  .page-about .about-team {
    padding: 84px 0 88px;
  }

  .page-about .about-team__inner {
    grid-template-columns: minmax(0, 55fr) minmax(0, 45fr);
    gap: 60px;
    align-items: center;
  }

  .page-about .about-time {
    padding: 80px 0 88px;
  }

  .page-about .about-time__list {
    padding-left: 8px;
    max-width: 780px;
  }

  .page-about .about-time__node {
    padding: 0 0 44px 46px;
  }

  .page-about .about-time__node h3 {
    font-size: 22px;
  }

  .page-about .about-time__tip {
    font-size: 15px;
  }

  .page-about .about-local {
    padding: 80px 0 88px;
  }

  .page-about .about-local__figure {
    margin-bottom: 36px;
  }

  .page-about .about-local__text > p {
    font-size: 16px;
  }

  .page-about .about-next {
    padding: 12px 0 96px;
  }

  .page-about .about-next__inner {
    padding: 44px 48px 46px;
  }

  .page-about .about-next__inner h2 {
    font-size: 30px;
  }
}

@media (hover: hover) and (min-width: 860px) {
  .page-about .about-time__node:hover .about-time__dot {
    box-shadow: 0 0 0 5px rgba(56, 242, 192, 0.18);
  }

  .page-about .about-time__node:hover .about-time__tip {
    color: var(--fog);
  }
}

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