.page-about {
  --about-rail-w: 104px;
  --about-radius: 14px;
  position: relative;
  overflow-x: clip;
}

.page-about .breadcrumb {
  padding-block: 18px 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(22px, 4vw, 40px) clamp(34px, 6vw, 70px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(58% 72% at 82% 8%, rgba(247, 201, 72, 0.10), transparent 68%),
    radial-gradient(46% 60% at 8% 92%, rgba(53, 160, 107, 0.07), transparent 70%);
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-hero h1 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.05rem, 5.4vw, 3.85rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero .lead {
  margin: 18px 0 0;
  max-width: 36em;
  color: rgba(243, 240, 231, 0.84);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-hero__facts > div {
  padding-left: 12px;
  border-left: 2px solid var(--yellow);
}

.page-about .about-hero__facts dt {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-hero__facts dd {
  margin: 5px 0 0;
  font-size: 0.98rem;
  color: var(--paper);
}

.page-about .about-hero__facts .mono {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--yellow);
  letter-spacing: 0.02em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__media {
  position: relative;
}

.page-about .about-hero__media::before {
  content: "";
  position: absolute;
  left: -9px;
  top: 14%;
  bottom: 14%;
  width: 3px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--yellow), rgba(247, 201, 72, 0));
}

.page-about .about-hero__media .figure__frame {
  position: relative;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border-radius: var(--about-radius);
  border: 1px solid var(--line-600);
  background: var(--ink-800);
}

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

.page-about .about-hero__media .figure__cap {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--muted);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  position: relative;
  display: grid;
  gap: var(--gap);
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-about .about-rail {
  display: none;
}

.page-about .about-rail__cap {
  margin: 0 0 20px;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--muted);
  writing-mode: vertical-rl;
  text-orientation: mixed;
  height: 84px;
}

.page-about .about-rail__list {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 26px;
  margin: 0;
  padding: 0 0 0 18px;
  list-style: none;
}

.page-about .about-rail__list::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 4px;
  bottom: 4px;
  width: 1px;
  background: linear-gradient(180deg, var(--yellow), var(--line-600) 62%, rgba(43, 74, 99, 0));
}

.page-about .about-rail__link {
  position: relative;
  display: flex;
  align-items: center;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .about-rail__link::before {
  content: "";
  position: absolute;
  left: -18px;
  top: 50%;
  width: 7px;
  height: 7px;
  margin-top: -3.5px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--line-600);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--paper);
}

.page-about .about-rail__link:hover::before,
.page-about .about-rail__link:focus-visible::before {
  background: var(--yellow);
  border-color: var(--yellow);
}

.page-about .about-rail__year {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.22em;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  padding-block: clamp(26px, 4vw, 50px);
  border-top: 1px solid rgba(43, 74, 99, 0.55);
}

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

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about .about-sec__num {
  flex: none;
  font-family: var(--font-num);
  font-size: clamp(1.6rem, 3.2vw, 2.5rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.04em;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--yellow);
}

.page-about .about-sec h2 {
  margin: 0;
  font-size: clamp(1.3rem, 2.6vw, 1.8rem);
  font-weight: 700;
  line-height: 1.34;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-sec__body > p {
  max-width: 38em;
  margin: 0 0 1em;
  line-height: 1.78;
  color: rgba(243, 240, 231, 0.84);
}

.page-about .about-sec__body a {
  color: var(--yellow);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-sec__body a:hover {
  color: var(--yellow-bright);
}

/* ---------- 要点块 ---------- */
.page-about .about-points {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-points li {
  padding: 15px 16px 15px 18px;
  border-left: 2px solid var(--yellow);
  border-radius: 0 10px 10px 0;
  background: rgba(18, 41, 61, 0.66);
  font-size: 0.93rem;
  line-height: 1.68;
  color: rgba(243, 240, 231, 0.86);
}

.page-about .about-points .mono {
  color: var(--yellow);
}

/* ---------- 团队条形 ---------- */
.page-about .about-roster {
  margin: 26px 0 0;
}

.page-about .about-bar {
  display: flex;
  height: 44px;
  overflow: hidden;
  border: 1px solid var(--line-600);
  border-radius: 8px;
  background: rgba(10, 24, 38, 0.9);
}

.page-about .about-bar__seg {
  display: block;
}

.page-about .about-bar__seg--edit {
  flex: 14 1 0;
  background: linear-gradient(90deg, rgba(43, 74, 99, 0.85), #3d6483);
}

.page-about .about-bar__seg--review {
  flex: 6 1 0;
  background: linear-gradient(90deg, var(--yellow), var(--yellow-bright));
}

.page-about .about-roster__legend {
  display: grid;
  gap: 10px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-roster__legend li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-roster__legend .mono {
  color: var(--paper);
}

.page-about .about-roster__dot {
  flex: none;
  width: 12px;
  height: 12px;
  border-radius: 3px;
}

.page-about .about-roster__dot--edit {
  background: #3d6483;
}

.page-about .about-roster__dot--review {
  background: var(--yellow);
}

.page-about .about-roles {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.page-about .about-role {
  padding: 18px;
  border: 1px solid rgba(43, 74, 99, 0.75);
  border-radius: 12px;
  background: linear-gradient(180deg, rgba(18, 41, 61, 0.78), rgba(18, 41, 61, 0.32));
}

.page-about .about-role h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .about-role h3::after {
  content: "";
  display: block;
  width: 26px;
  height: 2px;
  margin-top: 10px;
  background: var(--yellow);
}

.page-about .about-role p {
  margin: 12px 0 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(243, 240, 231, 0.78);
}

/* ---------- 技能树流程 ---------- */
.page-about .about-tree {
  position: relative;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tree__item {
  position: relative;
  padding-bottom: 18px;
}

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

.page-about .about-tree__item:not(:last-child)::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 46px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--line-600), rgba(43, 74, 99, 0.2));
}

.page-about .about-tree__step > summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0;
  list-style: none;
  cursor: pointer;
  border-radius: 10px;
  transition: background var(--dur) var(--ease);
}

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

.page-about .about-tree__step > summary:hover,
.page-about .about-tree__step > summary:focus-visible {
  background: rgba(255, 255, 255, 0.045);
}

.page-about .about-tree__node {
  flex: none;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--yellow);
  background: var(--yellow);
  color: var(--ink-900);
  font-size: 13px;
  font-weight: 600;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-tree__step[open] .about-tree__node {
  transform: scale(1.12);
  background: var(--yellow-bright);
}

.page-about .about-tree__label {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.page-about .about-tree__name {
  font-size: 1rem;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-tree__meta {
  font-family: var(--font-num);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-tree__chev {
  flex: none;
  width: 8px;
  height: 8px;
  margin-left: auto;
  margin-right: 4px;
  border-right: 1.5px solid var(--muted);
  border-bottom: 1.5px solid var(--muted);
  transform: rotate(45deg);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-tree__step[open] .about-tree__chev {
  transform: rotate(-135deg);
  border-color: var(--yellow);
}

.page-about .about-tree__panel {
  margin: 12px 0 2px 54px;
  padding: 14px 16px;
  border-left: 2px solid var(--yellow);
  border-radius: 0 10px 10px 0;
  background: rgba(18, 41, 61, 0.66);
  font-size: 0.91rem;
  line-height: 1.72;
  color: rgba(243, 240, 231, 0.84);
}

.page-about .about-tree__panel p {
  margin: 0;
}

.page-about .about-tree__panel a {
  color: var(--yellow);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-flow__figure {
  margin: 30px 0 0;
}

.page-about .about-flow__figure .figure__frame {
  overflow: hidden;
  border-radius: var(--about-radius);
  border: 1px solid var(--line-600);
  aspect-ratio: 16 / 9;
  background: var(--ink-800);
}

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

.page-about .about-flow__figure .figure__cap {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--muted);
}

/* ---------- 可信等级 ---------- */
.page-about .about-trust {
  display: grid;
  gap: 14px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-trust__item {
  padding: 20px 18px 18px;
  border: 1px solid rgba(43, 74, 99, 0.8);
  border-top: 3px solid var(--line-600);
  border-radius: 4px 4px 12px 12px;
  background: rgba(18, 41, 61, 0.58);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-trust__item:hover,
.page-about .about-trust__item:focus-within {
  transform: translateY(-3px);
  background: rgba(18, 41, 61, 0.86);
  box-shadow: 0 14px 28px rgba(4, 12, 20, 0.45);
}

.page-about .about-trust__item--done {
  border-top-color: var(--green);
}

.page-about .about-trust__item--pending {
  border-top-color: var(--yellow);
}

.page-about .about-trust__item--ref {
  border-top-color: var(--muted);
}

.page-about .about-trust__badge {
  display: inline-block;
  margin: 0;
  padding: 4px 10px;
  border: 1px solid transparent;
  border-radius: 3px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
}

.page-about .about-trust__item--done .about-trust__badge {
  background: var(--green);
  border-color: var(--green);
  color: var(--paper);
}

.page-about .about-trust__item--pending .about-trust__badge {
  background: var(--yellow);
  border-color: var(--yellow);
  color: var(--ink-900);
}

.page-about .about-trust__item--ref .about-trust__badge {
  background: var(--muted);
  border-color: var(--muted);
  color: var(--ink-900);
}

.page-about .about-trust__item h3 {
  margin: 14px 0 0;
  font-size: 0.98rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-trust__item > p:not(.about-trust__badge):not(.about-trust__tip) {
  margin: 10px 0 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(243, 240, 231, 0.78);
}

.page-about .about-trust__tip {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed rgba(43, 74, 99, 0.9);
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 版本沿革 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: 16px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline__item {
  display: grid;
  gap: 12px;
  padding: 18px 18px 20px;
  border: 1px solid rgba(43, 74, 99, 0.72);
  border-radius: 12px;
  background: linear-gradient(180deg, rgba(18, 41, 61, 0.72), rgba(10, 24, 38, 0.45));
  scroll-margin-top: 92px;
}

.page-about .about-timeline__item--now {
  border-color: rgba(247, 201, 72, 0.55);
  background: linear-gradient(180deg, rgba(42, 44, 32, 0.72), rgba(18, 41, 61, 0.55));
}

.page-about .about-timeline__mark {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-timeline__year {
  font-size: 1.3rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--yellow);
}

.page-about .about-timeline__ver {
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-timeline__body h3 {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .about-timeline__body p {
  margin: 8px 0 0;
  font-size: 0.91rem;
  line-height: 1.72;
  color: rgba(243, 240, 231, 0.8);
}

.page-about .about-timeline__body a {
  color: var(--yellow);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 协作与联络 ---------- */
.page-about .about-handoff {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
}

.page-about .about-handoff__city {
  padding: 16px 18px;
  border: 1px solid rgba(43, 74, 99, 0.72);
  border-left: 3px solid var(--green);
  border-radius: 0 10px 10px 0;
  background: rgba(18, 41, 61, 0.5);
}

.page-about .about-handoff__city:last-child {
  border-left-color: var(--yellow);
}

.page-about .about-handoff__name {
  margin: 0 0 6px;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .about-handoff__city p:last-child {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.7;
  color: rgba(243, 240, 231, 0.78);
}

.page-about .about-contact {
  margin: 22px 0 0;
  padding: 20px 18px;
  border-radius: 12px;
  border: 1px solid rgba(247, 201, 72, 0.28);
  background: linear-gradient(135deg, rgba(247, 201, 72, 0.10), rgba(18, 41, 61, 0.6));
}

.page-about .about-contact__title {
  margin: 0 0 10px;
  font-size: 0.98rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--yellow);
}

.page-about .about-contact p:last-child {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: rgba(243, 240, 231, 0.84);
}

.page-about .about-contact a {
  color: var(--yellow);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-closing {
  margin: 30px 0 0;
}

.page-about .about-closing__frame {
  overflow: hidden;
  border-radius: var(--about-radius);
  border: 1px solid var(--line-600);
  aspect-ratio: 16 / 9;
  background: var(--ink-800);
}

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

.page-about .about-closing figcaption {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__inner {
    gap: 32px;
  }

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

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

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

@media (min-width: 720px) {
  .page-about .about-points {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-timeline__item {
    grid-template-columns: 128px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
  }

  .page-about .about-timeline__mark {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .page-about .about-flow__figure .figure__frame {
    aspect-ratio: 21 / 9;
  }
}

@media (min-width: 860px) {
  .page-about .about-trust {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: center;
    gap: clamp(28px, 4vw, 56px);
  }
}

@media (min-width: 1040px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 60px);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: 96px;
  }

  .page-about .about-sec__head {
    gap: 18px;
  }
}

@supports not (-webkit-text-stroke: 1px black) {
  .page-about .about-sec__num {
    color: var(--yellow);
  }
}
<<<END>>>