.page-about {
  display: block;
}

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

.page-about .about-wrap {
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: clamp(26px, 5vw, 60px) var(--pad) clamp(60px, 9vw, 110px);
  display: flex;
  flex-direction: column;
  gap: clamp(48px, 8vw, 96px);
}

/* 面包屑 */
.page-about .about-crumbs {
  margin-bottom: 4px;
}

.page-about .about-crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 13px;
  color: var(--grey);
}

.page-about .about-crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--wash-3);
}

.page-about .about-crumbs a {
  color: var(--dai);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .2s var(--ease);
}

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

/* 首屏 */
.page-about .about-head {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about h1 {
  font-family: var(--serif);
  font-size: clamp(30px, 5.6vw, 52px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: .02em;
  color: var(--ink);
  margin: 0;
  max-width: 20em;
}

.page-about .about-lede {
  max-width: var(--measure);
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.85;
  color: var(--grey);
  margin: 0;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 6px 0 0;
  padding: 1px;
  background: var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .about-stats__item {
  background: var(--card);
  padding: 14px 16px 16px;
}

.page-about .about-stats dt {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--wash-1);
  margin-bottom: 6px;
}

.page-about .about-stats dd {
  margin: 0;
  font-family: var(--mono);
  font-size: clamp(19px, 2.4vw, 26px);
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

/* 章节骨架 */
.page-about .about-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .about-h2 {
  font-family: var(--serif);
  font-size: clamp(23px, 3.2vw, 34px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: .02em;
  color: var(--ink);
  margin: 0;
  max-width: 24em;
}

.page-about .about-sub {
  max-width: var(--measure);
  font-size: 16px;
  line-height: 1.85;
  color: var(--grey);
  margin: 0;
}

.page-about .about-sub--after {
  margin-top: clamp(6px, 1vw, 12px);
}

.page-about .about-link {
  color: var(--dai);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 81, 94, .35);
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

.page-about .about-link:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.page-about .about-section > .about-figure,
.page-about .about-section > .about-timeline,
.page-about .about-section > .about-team,
.page-about .about-section > .about-v4,
.page-about .about-section > .about-flow,
.page-about .about-section > .about-partners,
.page-about .about-section > .about-principles {
  margin-top: clamp(12px, 1.8vw, 22px);
}

/* 插图 */
.page-about .about-figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--wash-4);
  border: 1px solid var(--line);
}

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

/* 时间线 */
.page-about .about-timeline {
  position: relative;
}

.page-about .about-stage {
  position: relative;
  padding-left: 36px;
  padding-bottom: clamp(26px, 4vw, 42px);
}

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

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 28px;
  bottom: 0;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--wash-2), var(--wash-4));
}

.page-about .about-stage:last-child::before {
  display: none;
}

.page-about .about-stage__dot {
  position: absolute;
  left: 2px;
  top: 6px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%, var(--green) 0 4px, var(--ink) 4.5px 100%);
  box-shadow: 0 0 0 4px var(--paper), 0 0 0 5px var(--wash-4);
  transition: transform .24s var(--ease), box-shadow .24s var(--ease);
}

.page-about .about-stage:hover .about-stage__dot {
  transform: scale(1.12);
  box-shadow: 0 0 0 4px var(--paper), 0 0 0 5px var(--orange);
}

.page-about .about-stage__body {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-stage__era {
  margin: 0;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .12em;
  color: var(--orange);
}

.page-about .about-stage__title {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-stage__text {
  margin: 0;
  max-width: var(--measure);
  font-size: 16px;
  line-height: 1.85;
  color: var(--grey);
}

.page-about .about-stage__aside {
  margin-top: 12px;
  max-width: 30em;
  padding-left: 14px;
  border-left: 2px solid var(--wash-4);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--grey);
  transition: border-color .24s var(--ease), color .24s var(--ease);
}

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

/* 团队 */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
  align-items: start;
}

.page-about .about-team__ring {
  display: grid;
  grid-template-columns: 132px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}

.page-about .about-ring {
  display: block;
  width: 132px;
  max-width: 100%;
  height: auto;
}

.page-about .about-ring__track {
  fill: none;
  stroke: var(--wash-4);
  stroke-width: 12;
}

.page-about .about-ring__seg {
  fill: none;
  stroke-width: 12;
}

.page-about .about-ring__seg--1 { stroke: var(--ink); }
.page-about .about-ring__seg--2 { stroke: var(--dai); }
.page-about .about-ring__seg--3 { stroke: var(--wash-1); }
.page-about .about-ring__seg--4 { stroke: var(--wash-2); }
.page-about .about-ring__seg--5 { stroke: var(--orange); }

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

.page-about .about-legend__item {
  position: relative;
  padding-left: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-legend__item:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.page-about .about-legend__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55em;
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: var(--wash-2);
}

.page-about .about-legend__item:nth-child(1)::before { background: var(--ink); }
.page-about .about-legend__item:nth-child(2)::before { background: var(--dai); }
.page-about .about-legend__item:nth-child(3)::before { background: var(--wash-1); }
.page-about .about-legend__item:nth-child(4)::before { background: var(--wash-2); }
.page-about .about-legend__item:nth-child(5)::before { background: var(--orange); }

.page-about .about-legend__name {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: .02em;
  margin-bottom: 3px;
}

.page-about .about-legend__meta {
  display: block;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--grey);
}

.page-about .about-team__figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--wash-4);
}

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

.page-about .about-team__figure figcaption {
  background: var(--card);
  border-top: 1px solid var(--line);
  padding: 10px 16px 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--grey);
}

/* V4 目录 */
.page-about .about-v4 {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 36px);
  align-items: start;
}

.page-about .about-v4__main p {
  margin: 0 0 14px;
  max-width: var(--measure);
  font-size: 16px;
  line-height: 1.85;
  color: var(--grey);
}

.page-about .about-v4__main p:last-child {
  margin-bottom: 0;
}

.page-about .about-v4__side {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
  box-shadow: var(--shadow);
}

.page-about .about-v4__facts {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-v4__facts div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--line);
}

.page-about .about-v4__facts div:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.page-about .about-v4__facts dt {
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: .04em;
  color: var(--grey);
}

.page-about .about-v4__facts dd {
  margin: 0;
  font-family: var(--mono);
  font-size: 18px;
  font-weight: 600;
  white-space: nowrap;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

/* 六道工序 */
.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-flow__panel {
  height: 100%;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color .24s var(--ease), box-shadow .24s var(--ease);
}

.page-about .about-flow__panel[open] {
  border-color: var(--dai);
  box-shadow: 0 14px 32px -26px rgba(22, 35, 43, .7);
}

.page-about .about-flow__summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 17px;
}

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

.page-about .about-flow__summary::marker {
  content: "";
}

.page-about .about-flow__summary::after {
  content: "＋";
  margin-left: auto;
  font-size: 14px;
  line-height: 1;
  color: var(--wash-2);
  transition: transform .24s var(--ease), color .24s var(--ease);
}

.page-about .about-flow__panel[open] .about-flow__summary::after {
  transform: rotate(45deg);
  color: var(--orange);
}

.page-about .about-flow__num {
  flex: none;
  padding: 3px 7px;
  border-radius: 6px;
  background: rgba(255, 122, 46, .1);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--orange);
}

.page-about .about-flow__name {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--ink);
}

.page-about .about-flow__body {
  margin: 0 17px 16px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 14px;
  line-height: 1.75;
  color: var(--grey);
}

/* 合作 */
.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-partners__card {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--card);
  padding: clamp(20px, 3vw, 28px);
}

.page-about .about-partners__card::before {
  content: "";
  position: absolute;
  right: -34px;
  bottom: -34px;
  width: 130px;
  height: 130px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(34, 81, 94, .12), transparent 70%);
  pointer-events: none;
}

.page-about .about-partners__num {
  position: relative;
  margin: 0;
  font-family: var(--mono);
  font-size: clamp(34px, 5vw, 46px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--dai);
  font-variant-numeric: tabular-nums;
}

.page-about .about-partners__card h3 {
  position: relative;
  margin: 8px 0 10px;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-partners__card p:last-child {
  position: relative;
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--grey);
}

/* 三条规矩 */
.page-about .about-principles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-principles__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 20px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  border-top: 3px solid var(--dai);
  background: var(--card);
}

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

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

.page-about .about-principles__num {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--wash-2);
}

.page-about .about-principles__item h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-principles__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--grey);
}

/* 收尾 */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--ink);
  padding: clamp(26px, 5vw, 48px);
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  right: -70px;
  top: -70px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(198, 255, 61, .2), transparent 68%);
  pointer-events: none;
}

.page-about .about-cta::after {
  content: "";
  position: absolute;
  left: -50px;
  bottom: -80px;
  width: 200px;
  height: 200px;
  border-radius: 48% 52% 60% 40% / 55% 45% 55% 45%;
  background: rgba(255, 122, 46, .16);
  pointer-events: none;
}

.page-about .about-cta__title {
  position: relative;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(21px, 3vw, 30px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-about .about-cta__text {
  position: relative;
  margin: 12px 0 0;
  max-width: var(--measure);
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(246, 243, 236, .78);
}

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

.page-about .about-cta .btn--ghost {
  color: var(--paper);
  border-color: rgba(246, 243, 236, .38);
}

.page-about .about-cta .btn--ghost:hover {
  border-color: var(--green);
  color: var(--green);
}

/* 回到顶部 */
.page-about .about-totop {
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 40;
  display: inline-flex;
  align-items: center;
  padding: 9px 15px;
  border-radius: 999px;
  border: 1px solid rgba(198, 255, 61, .42);
  background: var(--ink);
  color: var(--paper);
  font-size: 13px;
  letter-spacing: .04em;
  text-decoration: none;
  box-shadow: 0 14px 30px -18px rgba(22, 35, 43, .85);
  opacity: .92;
  transition: opacity .2s var(--ease), transform .2s var(--ease);
}

.page-about .about-totop:hover {
  opacity: 1;
  transform: translateY(-2px);
  color: var(--paper);
}

/* 断点 */
@media (min-width: 640px) {
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 860px) {
  .page-about .about-v4 {
    grid-template-columns: minmax(0, 1.4fr) minmax(230px, .8fr);
  }

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

@media (min-width: 900px) {
  .page-about .about-stage {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(200px, 250px);
    column-gap: clamp(24px, 4vw, 52px);
    align-items: start;
  }

  .page-about .about-stage__aside {
    margin-top: 4px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: center;
  }
}

@media (min-width: 1060px) {
  .page-about .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .page-about .about-team__ring {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

  .page-about .about-ring {
    width: 112px;
    margin: 0 auto;
  }

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

  .page-about .about-stage__dot {
    left: 0;
  }

  .page-about .about-stage::before {
    left: 9px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stage__dot,
  .page-about .about-stage__aside,
  .page-about .about-flow__panel,
  .page-about .about-flow__summary::after,
  .page-about .about-totop {
    transition: none;
  }

  .page-about .about-stage:hover .about-stage__dot,
  .page-about .about-totop:hover {
    transform: none;
  }
}