.page-about {
  --about-rail: 236px;
  --about-cut: 34px;
  background: var(--paper);
  color: var(--ink-2);
}

.page-about .about-crumb {
  padding-top: 16px;
  padding-bottom: 4px;
}

.page-about .about-crumb__sep {
  margin: 0 8px;
  color: var(--slate);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  margin-top: 12px;
  padding: clamp(30px, 6vw, 66px) 0 clamp(52px, 9vw, 96px);
  background: var(--ink);
  color: var(--paper);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 calc(100% - var(--about-cut)));
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  top: -10%;
  width: 46%;
  height: 130%;
  background: linear-gradient(180deg, rgba(56, 242, 208, 0.18), rgba(56, 242, 208, 0) 68%);
  transform: skewX(-12deg);
  pointer-events: none;
}

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

.page-about .about-hero .tq-eyebrow {
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 14px 0 18px;
  max-width: 20em;
  font-family: var(--font-head);
  font-size: clamp(27px, 5.2vw, 48px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--paper-lift);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 44em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: rgba(243, 233, 215, 0.82);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--line-dark);
  display: grid;
  gap: 16px;
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  font-size: 13px;
  line-height: 1.5;
  color: rgba(243, 233, 215, 0.62);
}

.page-about .about-hero__figure {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 36px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-about .about-hero__facts li:last-child .about-hero__figure {
  font-size: clamp(18px, 2.4vw, 26px);
  color: var(--cyan);
}

/* ---------- 主体布局 ---------- */

.page-about .about-layout {
  display: grid;
  gap: 22px;
  padding-top: clamp(26px, 4vw, 42px);
  padding-bottom: clamp(48px, 8vw, 88px);
}

.page-about .about-rail__inner {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-lift);
  padding: 16px 14px;
}

.page-about .about-toc {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .about-toc__title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--moss);
  text-transform: uppercase;
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0 0 2px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc__list li {
  flex: 0 0 auto;
}

.page-about .about-toc__list .tq-toc__link {
  display: block;
  padding: 7px 11px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: transparent;
  color: var(--moss);
  font-size: 13px;
  font-weight: 600;
  line-height: 1.4;
  white-space: nowrap;
  text-decoration: none;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-toc__list .tq-toc__link:hover,
.page-about .about-toc__list .tq-toc__link[aria-current="true"] {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--cyan);
}

.page-about .about-toc__cta {
  align-self: flex-start;
  text-decoration: none;
}

/* ---------- 章节 ---------- */

.page-about .about-sec {
  padding-top: clamp(26px, 4vw, 46px);
  padding-bottom: clamp(26px, 4vw, 46px);
  border-top: 1px solid var(--line);
}

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-sec--last {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-sec__head {
  display: flex;
  align-items: center;
  gap: 13px;
  margin-bottom: clamp(16px, 2.6vw, 26px);
}

.page-about .about-sec__no {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 54px;
  height: 32px;
  padding: 0 8px;
  background: var(--ink);
  color: var(--cyan);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  clip-path: polygon(13px 0, 100% 0, calc(100% - 13px) 100%, 0 100%);
}

.page-about .about-sec h2 {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(20px, 3.2vw, 29px);
  font-weight: 800;
  line-height: 1.32;
  letter-spacing: -0.02em;
  color: var(--ink-2);
}

.page-about .about-p {
  margin: 0 0 14px;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.85;
  color: var(--ink-2);
}

.page-about .about-p--lead {
  margin-bottom: 20px;
  color: var(--moss);
}

.page-about .about-split {
  display: grid;
  gap: clamp(20px, 3.4vw, 34px);
}

/* ---------- 图 ---------- */

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 9px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--slate);
}

/* ---------- 角色清单 ---------- */

.page-about .about-roles {
  list-style: none;
  margin: 18px 0;
  padding: 0;
  display: grid;
  gap: 13px;
}

.page-about .about-roles li {
  padding-left: 15px;
  border-left: 3px solid var(--cyan-ink);
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-2);
}

.page-about .about-roles strong {
  display: block;
  margin-bottom: 3px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
}

/* ---------- 三条路径 ---------- */

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

.page-about .about-path {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 17px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-lift);
  overflow: hidden;
  transition: transform 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-path::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: var(--cyan);
}

.page-about .about-path:nth-child(2)::before {
  background: var(--orange);
}

.page-about .about-path:nth-child(3)::before {
  background: var(--moss);
}

.page-about .about-path h3 {
  margin: 0;
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .about-path p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--slate);
}

.page-about .about-path a {
  margin-top: auto;
  align-self: flex-start;
  padding-bottom: 2px;
  border-bottom: 2px solid var(--rust);
  font-size: 13.5px;
  font-weight: 700;
  color: var(--cyan-ink);
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-path a:hover {
  color: var(--orange-ink);
  border-color: var(--orange);
}

/* ---------- 流程 ---------- */

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

.page-about .about-flow li {
  position: relative;
  padding: 0 0 20px 30px;
}

.page-about .about-flow li::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  box-shadow: 0 0 0 4px rgba(56, 242, 208, 0.3);
}

.page-about .about-flow li::after {
  content: "";
  position: absolute;
  left: 8px;
  top: 26px;
  bottom: 2px;
  width: 1px;
  background: var(--line);
}

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

.page-about .about-flow li:last-child::after {
  display: none;
}

.page-about .about-flow strong {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-flow p {
  margin: 5px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--slate);
}

/* ---------- 团队 ---------- */

.page-about .about-teams {
  display: grid;
  gap: 12px;
  margin-bottom: 18px;
}

.page-about .about-team {
  padding: 18px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-lift);
}

.page-about .about-team h3 {
  margin: 0 0 8px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-team h3::before {
  content: "";
  display: inline-block;
  width: 18px;
  height: 3px;
  margin-right: 8px;
  vertical-align: 4px;
  background: var(--orange);
}

.page-about .about-team p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--slate);
}

/* ---------- 版本时间轴 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 22px;
  position: relative;
  display: grid;
  gap: 12px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--magenta), var(--orange) 52%, var(--cyan));
}

.page-about .about-timeline li {
  position: relative;
}

.page-about .about-timeline li::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 19px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 3px var(--paper);
}

.page-about .about-version {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-lift);
  overflow: hidden;
}

.page-about .about-version summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  padding: 13px 15px;
  list-style: none;
  cursor: pointer;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--ink);
}

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

.page-about .about-version summary::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--moss);
}

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

.page-about .about-version summary .tq-num {
  font-size: 14.5px;
  color: var(--rust);
}

.page-about .about-version__name {
  font-weight: 700;
}

.page-about .about-version__body {
  padding: 0 15px 15px;
}

.page-about .about-version__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 合作网络 ---------- */

.page-about .about-net {
  position: relative;
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-net__node {
  position: relative;
  padding: 15px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-lift);
  transition: transform 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-net__node strong {
  display: block;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-net__tip {
  display: block;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--slate);
}

/* ---------- 联系 ---------- */

.page-about .about-contact {
  display: grid;
  gap: 24px;
  padding: clamp(24px, 4vw, 42px);
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--paper);
}

.page-about .about-contact h2 {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: clamp(20px, 3vw, 27px);
  font-weight: 800;
  line-height: 1.34;
  letter-spacing: -0.02em;
  color: var(--paper-lift);
}

.page-about .about-contact__main p {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.82;
  color: rgba(243, 233, 215, 0.78);
}

.page-about .about-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

.page-about .about-contact__actions .tq-btn {
  text-decoration: none;
}

.page-about .about-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}

.page-about .about-links a {
  font-size: 13px;
  font-weight: 600;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(56, 242, 208, 0.4);
  padding-bottom: 1px;
}

.page-about .about-links a:hover {
  color: var(--orange);
  border-color: var(--orange);
}

.page-about .about-contact__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .about-contact__list li {
  display: grid;
  gap: 3px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-contact__list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-contact__list span {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: rgba(243, 233, 215, 0.55);
}

.page-about .about-contact__list strong {
  font-family: var(--font-mono);
  font-size: 14.5px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--cyan);
  word-break: break-word;
}

/* ---------- 桌面布局 ---------- */

@media (min-width: 680px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

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

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

@media (min-width: 820px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

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

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

  .page-about .about-path:hover {
    transform: translateY(-3px);
    border-color: var(--cyan-ink);
  }
}

@media (min-width: 760px) {
  .page-about .about-net {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 10px;
    padding-top: 22px;
  }

  .page-about .about-net::before {
    content: "";
    position: absolute;
    left: 12%;
    right: 12%;
    top: 22px;
    height: 2px;
    background: repeating-linear-gradient(90deg, var(--moss) 0 7px, transparent 7px 14px);
  }

  .page-about .about-net__node {
    padding: 30px 12px 16px;
    text-align: center;
  }

  .page-about .about-net__node::before {
    content: "";
    position: absolute;
    left: 50%;
    top: 0;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--cyan);
    border: 3px solid var(--ink);
    transform: translate(-50%, -50%);
  }
}

@media (hover: hover) and (min-width: 760px) {
  .page-about .about-net__tip {
    opacity: 0;
    transition: opacity 0.2s var(--ease), color 0.2s var(--ease);
  }

  .page-about .about-net__node:hover {
    transform: translateY(-3px);
    border-color: var(--cyan-ink);
  }

  .page-about .about-net__node:hover .about-net__tip {
    opacity: 1;
    color: var(--cyan-ink);
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(32px, 4.5vw, 68px);
    align-items: start;
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: 88px;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 5px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-toc__list .tq-toc__link {
    border-color: transparent;
    padding: 7px 10px;
    white-space: normal;
  }

  .page-about .about-toc__list .tq-toc__link:hover,
  .page-about .about-toc__list .tq-toc__link[aria-current="true"] {
    border-color: var(--ink);
  }

  .page-about .about-contact {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }
}

@media (min-width: 1140px) {
  .page-about .about-hero {
    --about-cut: 52px;
  }
}

/* ---------- 降低动态效果 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero::after {
    background: none;
  }

  .page-about .about-path,
  .page-about .about-net__node,
  .page-about .about-toc__list .tq-toc__link,
  .page-about .about-net__tip {
    transition: none;
  }

  .page-about .about-path:hover,
  .page-about .about-net__node:hover {
    transform: none;
  }
}
<<<END>>>