.page-about {
  --about-sec-gap: clamp(40px, 8vw, 88px);
  --about-pad: clamp(16px, 4vw, 48px);
  --about-inner-gap: clamp(22px, 4vw, 44px);
  color: var(--paper);
}

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

.page-about .about-p {
  margin: 0 0 1.2em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--paper);
  max-width: 66ch;
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: clamp(18px, 3vw, 32px);
}

.page-about .about-hero .crumbs {
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .about-hero-head {
  display: grid;
  gap: 14px;
  max-width: 820px;
}

.page-about .about-title {
  margin: 0;
  line-height: 1.08;
}

.page-about .about-lede {
  margin: 0;
  max-width: 58ch;
  color: var(--muted);
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.75;
}

.page-about .about-hero-stats {
  list-style: none;
  margin: clamp(26px, 5vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}

.page-about .about-hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 12px 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero-stats .mono {
  color: var(--cyan);
  font-size: clamp(18px, 3.6vw, 26px);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .about-hero-stats .stat-label {
  color: var(--muted);
  font-size: 12.5px;
  letter-spacing: 0.04em;
}

.page-about .about-banner {
  margin: clamp(26px, 5vw, 48px) 0 0;
  position: relative;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-banner img {
  width: 100%;
  aspect-ratio: 20 / 9;
  object-fit: cover;
  filter: saturate(0.85) brightness(0.8);
}

.page-about .about-banner .media-cap {
  position: absolute;
  left: var(--about-pad);
  bottom: clamp(10px, 2vw, 18px);
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  background: rgba(7, 19, 15, 0.72);
  padding: 5px 10px;
  border-left: 2px solid var(--orange);
}

/* ---------- 起点与定位 ---------- */

.page-about .about-origin-grid {
  display: grid;
  gap: var(--about-inner-gap);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-origin-main .h2 {
  margin: 0 0 clamp(16px, 2.6vw, 24px);
  line-height: 1.18;
}

.page-about .about-tick {
  margin: clamp(18px, 3vw, 26px) 0 0;
  display: grid;
  gap: 10px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .about-origin-side {
  display: grid;
  gap: 14px;
  align-content: start;
  position: relative;
  padding-left: 0;
}

.page-about .about-origin-side .annot {
  color: var(--gray-line, var(--muted));
  justify-self: start;
}

.page-about .about-side-note {
  border: 1px solid var(--line);
  border-left: 2px solid var(--orange);
  background: var(--navy);
  padding: 14px 16px;
  display: grid;
  gap: 6px;
}

.page-about .about-side-num {
  margin: 0;
  color: var(--lime);
  font-size: clamp(20px, 3.4vw, 26px);
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-about .about-side-text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 时间线 ---------- */

.page-about .about-sec-head {
  display: grid;
  gap: 12px;
  max-width: 720px;
  margin-bottom: clamp(26px, 4vw, 42px);
}

.page-about .about-sec-head .h2 {
  margin: 0;
  line-height: 1.2;
}

.page-about .about-sec-lede {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
  max-width: 62ch;
}

.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
  border-left: 1px solid var(--line);
  display: grid;
  gap: 12px;
}

.page-about .about-tl-item {
  position: relative;
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 20px;
  width: 9px;
  height: 9px;
  background: var(--orange);
  transform: rotate(45deg);
}

.page-about .about-tl-node {
  background: var(--board);
  border: 1px solid var(--line);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-tl-node[open] {
  border-color: var(--lime);
  background: var(--navy);
}

.page-about .about-tl-node summary {
  list-style: none;
  cursor: pointer;
  position: relative;
  padding: 14px 34px 14px 14px;
  display: grid;
  gap: 4px;
}

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

.page-about .about-tl-node summary::after {
  content: "+";
  position: absolute;
  right: 14px;
  top: 14px;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-tl-node[open] summary::after {
  content: "−";
  color: var(--orange);
}

.page-about .about-tl-node summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

.page-about .about-tl-num {
  color: var(--orange);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.page-about .about-tl-node[open] .about-tl-num {
  color: var(--lime);
}

.page-about .about-tl-stage {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.05em;
}

.page-about .about-tl-name {
  font-size: clamp(17px, 2.6vw, 21px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-tl-body {
  padding: 0 14px 16px;
  margin-top: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-tl-body p {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-tl-link {
  justify-self: start;
  font-size: 13.5px;
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 255, 68, 0.45);
  padding-bottom: 2px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-tl-link:hover,
.page-about .about-tl-link:focus-visible {
  color: var(--lime-soft);
  border-bottom-color: var(--lime-soft);
}

/* ---------- 团队 ---------- */

.page-about .about-team-grid {
  display: grid;
  gap: var(--about-inner-gap);
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
}

.page-about .about-team-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-team-table {
  width: 100%;
  min-width: 460px;
  border-collapse: collapse;
  font-size: 14.5px;
}

.page-about .about-team-table thead th {
  text-align: left;
  padding: 0 12px 10px 0;
  border-bottom: 1px solid var(--line);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
  font-weight: 600;
}

.page-about .about-team-table tbody th {
  text-align: left;
  padding: 13px 12px 13px 0;
  border-bottom: 1px solid var(--line);
  color: var(--paper);
  font-weight: 700;
  white-space: nowrap;
}

.page-about .about-team-table tbody td {
  padding: 13px 12px 13px 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  line-height: 1.65;
  vertical-align: top;
}

.page-about .about-team-table tbody td.mono {
  color: var(--cyan);
  font-size: 15px;
  font-weight: 700;
  white-space: nowrap;
  width: 4em;
}

.page-about .about-team-note {
  margin: 16px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--lime);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 60ch;
}

.page-about .about-team-media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--board);
}

.page-about .about-team-media img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.8) brightness(0.85);
}

.page-about .about-team-media .media-cap {
  display: block;
  padding: 10px 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

/* ---------- 合作网络（全宽节奏中断） ---------- */

.page-about .about-network {
  position: relative;
  overflow: hidden;
  background: var(--navy);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding-block: var(--about-sec-gap);
}

.page-about .about-network-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-network-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.32;
  filter: saturate(0.6);
}

.page-about .about-network-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(104deg, var(--ink) 16%, rgba(7, 19, 15, 0.72) 58%, rgba(7, 19, 15, 0.94) 100%),
    repeating-linear-gradient(104deg, transparent 0 46px, rgba(39, 74, 61, 0.55) 46px 47px);
}

.page-about .about-network-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(22px, 4vw, 38px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-network-text .h2 {
  margin: 0 0 clamp(16px, 2.6vw, 22px);
  line-height: 1.2;
}

.page-about .about-dots {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 8px;
  max-width: 320px;
  align-self: start;
}

.page-about .about-dots li {
  aspect-ratio: 1;
  border: 1px solid var(--line);
  background: rgba(201, 255, 68, 0.09);
  transform: skewX(-9deg);
}

.page-about .about-dots li:nth-child(3n + 1) {
  border-color: var(--lime);
  background: rgba(201, 255, 68, 0.2);
}

.page-about .about-dots li:nth-child(5n) {
  border-color: var(--orange);
  background: rgba(255, 122, 60, 0.16);
}

.page-about .about-network-figures {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  align-self: start;
}

.page-about .about-network-figures > div {
  background: rgba(7, 19, 15, 0.82);
  padding: 14px 16px;
  display: grid;
  gap: 4px;
}

.page-about .about-network-figures dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-network-figures dd {
  margin: 0;
  color: var(--cyan);
  font-size: clamp(19px, 3vw, 24px);
  font-weight: 700;
  letter-spacing: 0.01em;
}

/* ---------- 四条原则 ---------- */

.page-about .about-principles-list {
  border-top: 1px solid var(--line);
}

.page-about .about-principle {
  border-bottom: 1px solid var(--line);
  transition: background-color var(--dur) var(--ease);
}

.page-about .about-principle[open] {
  background: linear-gradient(90deg, rgba(18, 42, 34, 0.9), rgba(18, 42, 34, 0));
}

.page-about .about-principle summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: 2.4em minmax(0, 1fr);
  grid-template-areas:
    "idx title"
    "idx sub";
  align-items: center;
  gap: 2px 12px;
  padding: 16px 4px 16px 0;
}

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

.page-about .about-principle summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 4px;
}

.page-about .about-p-idx {
  grid-area: idx;
  color: var(--orange);
  font-size: 13px;
  letter-spacing: 0.08em;
  align-self: start;
  padding-top: 4px;
  transition: color var(--dur) var(--ease);
}

.page-about .about-principle[open] .about-p-idx {
  color: var(--lime);
}

.page-about .about-p-title {
  grid-area: title;
  font-size: clamp(18px, 2.6vw, 22px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-p-sub {
  grid-area: sub;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-p-body {
  margin: 0;
  padding: 0 0 18px 2.4em;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
  max-width: 66ch;
}

/* ---------- 收尾 ---------- */

.page-about .about-close-inner {
  position: relative;
  display: grid;
  gap: clamp(18px, 3vw, 28px);
  grid-template-columns: minmax(0, 1fr);
  align-items: center;
  padding: clamp(22px, 4vw, 36px);
  background: var(--board);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-close-inner::before {
  content: "";
  position: absolute;
  left: -10%;
  top: 0;
  bottom: 0;
  width: 46%;
  background: linear-gradient(12deg, rgba(255, 122, 60, 0.12), transparent 70%);
  transform: skewX(-14deg);
  pointer-events: none;
}

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

.page-about .about-close-text .h3 {
  margin: 0 0 10px;
  line-height: 1.3;
}

.page-about .about-close-text p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 56ch;
}

.page-about .about-close-actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  border-radius: 0;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-btn--lime {
  background: var(--lime);
  color: var(--ink-on-lime);
}

.page-about .about-btn--lime:hover,
.page-about .about-btn--lime:focus-visible {
  background: var(--lime-soft);
}

.page-about .about-btn--ghost {
  background: transparent;
  color: var(--paper);
  box-shadow: inset 0 0 0 1px var(--line);
}

.page-about .about-btn--ghost:hover,
.page-about .about-btn--ghost:focus-visible {
  color: var(--lime);
  box-shadow: inset 0 0 0 1px var(--lime);
}

.page-about .about-btn:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

/* ---------- 回到顶部 ---------- */

.page-about .about-totop {
  position: fixed;
  right: clamp(12px, 3vw, 28px);
  bottom: clamp(78px, 15vh, 112px);
  z-index: 6;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 14px;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-decoration: none;
  color: var(--ink-on-lime);
  background: var(--lime);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: background-color var(--dur) var(--ease);
}

.page-about .about-totop:hover,
.page-about .about-totop:focus-visible {
  background: var(--lime-soft);
}

.page-about .about-totop:focus-visible {
  outline: 2px solid var(--paper);
  outline-offset: 3px;
}

/* ---------- 断点 ---------- */

@media (min-width: 760px) {
  .page-about .about-hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-hero-stats li {
    border-bottom: 0;
    border-right: 1px solid var(--line);
    padding: 16px 16px 16px 0;
  }

  .page-about .about-hero-stats li:last-child {
    border-right: 0;
  }

  .page-about .about-network-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-close-inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (min-width: 900px) {
  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(28px, 5vw, 64px);
  }

  .page-about .about-origin-side {
    border-left: 1px solid var(--line);
    padding-left: clamp(18px, 2.5vw, 28px);
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(28px, 4vw, 48px);
  }

  .page-about .about-network-inner {
    grid-template-columns: minmax(0, 6fr) minmax(0, 3fr) minmax(0, 3fr);
    align-items: start;
  }

  .page-about .about-tl {
    padding-left: 30px;
  }

  .page-about .about-tl-item::before {
    left: -35px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-banner img {
    aspect-ratio: 20 / 8;
  }
}
<<<END>>>

.page-about {
  --gray-line: currentColor;
}