.page-about {
  --about-line: linear-gradient(180deg, var(--sand) 0%, var(--lava) 62%, var(--lake) 100%);
  --about-hair: rgba(15, 30, 36, 0.14);
  background: var(--paper);
  color: var(--ink);
}

.page-about img {
  max-width: 100%;
}

.page-about :where(a, summary, button):focus-visible {
  outline: 2px solid var(--lava);
  outline-offset: 2px;
}

/* ---------- 页头 ---------- */
.page-about .about-head {
  padding-top: clamp(24px, 5vw, 56px);
  padding-bottom: clamp(20px, 3vw, 36px);
}

.page-about .about-head h1 {
  margin: clamp(12px, 2vw, 18px) 0 0;
  font-size: clamp(32px, 7.4vw, 74px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  font-weight: 900;
  max-width: 20ch;
}

.page-about .about-head .lede {
  margin-top: clamp(14px, 2.4vw, 24px);
  max-width: 60ch;
  color: var(--ink);
  opacity: 0.84;
}

.page-about .about-meta {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--about-hair);
  display: flex;
  flex-wrap: wrap;
  gap: 12px clamp(20px, 4vw, 46px);
}

.page-about .about-meta__item {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .about-meta__n {
  font-family: var(--font-mono);
  font-size: var(--fs-md);
  font-weight: 500;
  color: var(--teal);
  font-feature-settings: "tnum";
}

.page-about .about-meta__k {
  font-size: var(--fs-sm);
  color: var(--slate);
}

.page-about .about-jump {
  margin-top: clamp(18px, 3vw, 28px);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
}

.page-about .about-jump a {
  font-size: var(--fs-sm);
  letter-spacing: 0.04em;
  color: var(--ink);
  text-decoration: none;
  padding: 6px 12px;
  border: 1px solid var(--about-hair);
  border-radius: 999px;
  background: transparent;
}

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

/* ---------- 首屏带状图 ---------- */
.page-about .about-band {
  margin: 0;
  max-width: 1440px;
  padding: 0 var(--pad);
}

.page-about .about-band__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border-radius: 0 clamp(24px, 6vw, 96px) 0 0;
  filter: saturate(1.05);
}

.page-about .about-band__cap {
  margin-top: 10px;
  font-size: var(--fs-sm);
  color: var(--slate);
  max-width: 58ch;
}

/* ---------- 时间轴 ---------- */
.page-about .about-lead {
  margin-top: 14px;
  max-width: 58ch;
  color: var(--slate);
  font-size: var(--fs-base);
}

.page-about .tl {
  list-style: none;
  margin: clamp(24px, 4vw, 44px) 0 0;
  padding: 0 0 0 32px;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--about-line);
  border-radius: 2px;
}

.page-about .tl__item {
  position: relative;
  padding-bottom: clamp(26px, 4vw, 48px);
}

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

.page-about .tl__node {
  position: absolute;
  left: -32px;
  top: 2px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid var(--sand);
  background: var(--paper);
  display: grid;
  place-items: center;
}

.page-about .tl__node::after {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--sand);
}

.page-about .tl__item--now .tl__node {
  border-color: var(--lava);
}

.page-about .tl__item--now .tl__node::after {
  background: var(--lava);
}

.page-about .tl__body {
  max-width: 46ch;
}

.page-about .tl__season {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  letter-spacing: 0.12em;
  color: var(--sand);
  font-weight: 500;
}

.page-about .tl__item--now .tl__season {
  color: var(--lava);
}

.page-about .tl__body h3 {
  margin: 6px 0 8px;
  font-size: clamp(19px, 2.6vw, 26px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  font-weight: 800;
}

.page-about .tl__body p {
  margin: 0;
  color: var(--ink);
  opacity: 0.86;
}

.page-about .tl__more {
  margin-top: 12px;
}

.page-about .tl__more summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-sm);
  color: var(--lake);
  padding-bottom: 2px;
  border-bottom: 1px dashed currentColor;
}

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

.page-about .tl__more summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: var(--fs-base);
  line-height: 1;
}

.page-about .tl__more[open] summary::before {
  content: "–";
}

.page-about .tl__more p {
  margin-top: 10px;
  font-size: var(--fs-sm);
  color: var(--slate);
  max-width: 52ch;
  border-left: 2px solid var(--mist);
  padding-left: 12px;
}

/* ---------- 三个小组 ---------- */
.page-about .crew-lead {
  margin-top: 14px;
  max-width: 56ch;
  color: var(--paper);
  opacity: 0.78;
}

.page-about .crew {
  margin-top: clamp(22px, 3.4vw, 40px);
  display: grid;
  gap: clamp(14px, 2.4vw, 22px);
}

.page-about .crew__fig {
  margin: 0;
  overflow: hidden;
  border-radius: 64px 8px 64px 8px;
}

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

.page-about .crew__cards {
  display: grid;
  gap: clamp(12px, 2vw, 18px);
}

.page-about .crew__card {
  background: var(--mist);
  color: var(--ink);
  padding: clamp(16px, 2.4vw, 26px);
  border-left: 4px solid var(--teal);
  border-radius: 2px;
}

.page-about .crew__card:nth-child(2) {
  border-left-color: var(--lake);
}

.page-about .crew__card:nth-child(3) {
  border-left-color: var(--lava);
}

.page-about .crew__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-lg);
  line-height: 1;
  font-weight: 500;
  color: var(--teal);
  font-feature-settings: "tnum";
}

.page-about .crew__card:nth-child(2) .crew__no {
  color: var(--lake);
}

.page-about .crew__card:nth-child(3) .crew__no {
  color: var(--clay);
}

.page-about .crew__card h3 {
  margin: 8px 0 10px;
  font-size: var(--fs-md);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .crew__card p {
  margin: 0 0 10px;
  font-size: var(--fs-base);
  line-height: 1.8;
}

.page-about .crew__scope {
  margin: 0;
  font-size: var(--fs-sm);
  color: var(--slate);
  border-top: 1px solid rgba(15, 30, 36, 0.12);
  padding-top: 8px;
}

/* ---------- 合作网络 ---------- */
.page-about .net {
  margin-top: clamp(22px, 3.4vw, 36px);
  display: grid;
  gap: clamp(20px, 4vw, 40px);
}

.page-about .net__figure {
  background: var(--mist);
  border-radius: 46% 54% 38% 62% / 55% 42% 58% 45%;
  padding: clamp(16px, 3vw, 28px);
}

.page-about .net__svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .net__text p {
  margin: 0 0 14px;
  color: var(--ink);
  opacity: 0.88;
}

.page-about .net__list {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .net__list li {
  position: relative;
  padding-left: 18px;
  font-size: var(--fs-base);
  line-height: 1.75;
}

.page-about .net__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--sand);
}

.page-about .net__list strong {
  color: var(--teal);
  font-weight: 800;
}

.page-about .net__link a {
  color: var(--lake);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--lake);
  padding-bottom: 2px;
}

.page-about .net__link a:hover {
  color: var(--teal);
  border-bottom-color: var(--teal);
}

/* ---------- 固定动作 ---------- */
.page-about .rhythm {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .rhythm__item {
  background: var(--paper);
  padding: clamp(16px, 2.4vw, 26px);
  border-top: 3px solid var(--sand);
}

.page-about .rhythm__item:nth-child(2) {
  border-top-color: var(--lake);
}

.page-about .rhythm__item:nth-child(3) {
  border-top-color: var(--lava);
}

.page-about .rhythm__item:nth-child(4) {
  border-top-color: var(--teal);
}

.page-about .rhythm__n {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-md);
  font-weight: 500;
  color: var(--lake);
  letter-spacing: 0.04em;
}

.page-about .rhythm__item h3 {
  margin: 8px 0 6px;
  font-size: var(--fs-md);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .rhythm__item p {
  margin: 0;
  font-size: var(--fs-base);
  line-height: 1.8;
  color: var(--ink);
  opacity: 0.84;
}

/* ---------- 里程碑数字 ---------- */
.page-about .miles-wrap {
  margin-top: clamp(22px, 3.4vw, 38px);
  display: grid;
  gap: clamp(22px, 4vw, 44px);
}

.page-about .miles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 3vw, 28px);
}

.page-about .miles__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(36px, 6vw, 56px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
  font-feature-settings: "tnum";
}

.page-about .miles__num--block {
  display: inline-block;
  background: var(--lava);
  color: var(--ink);
  padding: 2px 10px 4px;
}

.page-about .miles__cap {
  margin: 8px 0 0;
  font-size: var(--fs-sm);
  color: var(--slate);
  letter-spacing: 0.04em;
}

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

.page-about .miles__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 8px 72px 8px 72px;
}

.page-about .miles__fig figcaption {
  margin-top: 10px;
  font-size: var(--fs-sm);
  color: var(--slate);
  max-width: 34ch;
}

/* ---------- 下一步 ---------- */
.page-about .about-next__title {
  margin: 0 0 clamp(16px, 2.6vw, 24px);
  font-size: clamp(24px, 3.6vw, 36px);
  font-weight: 900;
  letter-spacing: -0.02em;
}

.page-about .next {
  display: grid;
  gap: 12px;
}

.page-about .next__link {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "t a"
    "d a";
  align-items: center;
  gap: 4px 14px;
  padding: 16px 18px;
  text-decoration: none;
  color: var(--ink);
  background: var(--mist);
  border-left: 4px solid var(--teal);
  transition: transform 0.25s ease, background 0.25s ease;
}

.page-about .next__link:nth-child(2) {
  border-left-color: var(--lake);
}

.page-about .next__link:nth-child(3) {
  border-left-color: var(--sand);
}

.page-about .next__link:nth-child(4) {
  border-left-color: var(--lava);
}

.page-about .next__link:hover {
  transform: translateX(4px);
  background: var(--paper);
}

.page-about .next__t {
  grid-area: t;
  font-size: var(--fs-md);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .next__d {
  grid-area: d;
  font-size: var(--fs-sm);
  color: var(--slate);
  line-height: 1.6;
}

.page-about .next__a {
  grid-area: a;
  font-family: var(--font-mono);
  font-size: var(--fs-md);
  color: var(--teal);
}

/* ---------- 中等屏 ---------- */
@media (min-width: 700px) {
  .page-about .rhythm {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px 20px;
  }

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

  .page-about .next {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .crew__cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .crew__card:nth-child(3) {
    grid-column: 1 / -1;
  }
}

/* ---------- 桌面：时间轴错落宽度 ---------- */
@media (min-width: 820px) {
  .page-about .tl {
    padding-left: 44px;
  }

  .page-about .tl::before {
    left: 13px;
  }

  .page-about .tl__node {
    left: -44px;
    width: 26px;
    height: 26px;
  }

  .page-about .tl__node::after {
    width: 10px;
    height: 10px;
  }

  .page-about .tl__item:nth-child(odd) .tl__body {
    max-width: 52ch;
  }

  .page-about .tl__item:nth-child(even) .tl__body {
    max-width: 34ch;
  }

  .page-about .about-band__img {
    aspect-ratio: 20 / 7;
  }
}

/* ---------- 桌面：靛夜分工带 ---------- */
@media (min-width: 900px) {
  .page-about .crew {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 22px 26px;
    align-items: start;
  }

  .page-about .crew__fig {
    grid-column: 1 / span 4;
    display: grid;
  }

  .page-about .crew__fig img {
    height: 100%;
    object-fit: cover;
  }

  .page-about .crew__cards {
    grid-column: 5 / span 8;
    grid-template-columns: repeat(8, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .crew__card:nth-child(1) {
    grid-column: 1 / span 5;
  }

  .page-about .crew__card:nth-child(2) {
    grid-column: 6 / span 3;
  }

  .page-about .crew__card:nth-child(3) {
    grid-column: 3 / span 6;
  }
}

/* ---------- 桌面：合作网络与里程碑并排 ---------- */
@media (min-width: 880px) {
  .page-about .net {
    grid-template-columns: 1.05fr 1fr;
    align-items: center;
  }

  .page-about .miles-wrap {
    grid-template-columns: 1.4fr 1fr;
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .next__link {
    transition: none;
  }

  .page-about .next__link:hover {
    transform: none;
  }
}
<<<END>>>