.page-about {
  --about-rule: rgba(30, 23, 18, .16);
  --about-rule-dark: rgba(185, 194, 204, .22);
  --about-paper: #FBF6EA;
}

/* ---------- 通用章节标题 ---------- */
.page-about .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  padding: 0;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-orange);
}
.page-about .eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--c-orange);
  flex: none;
}
.page-about .about-sec-title {
  margin: 0;
  font-family: var(--f-sans);
  font-weight: 900;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.2;
  letter-spacing: -.015em;
}
.page-about .about-sec-lede {
  margin: 16px 0 0;
  max-width: 44em;
  font-size: clamp(15.5px, 2vw, 17px);
  line-height: 1.85;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--c-abyss);
  color: var(--c-cream);
  padding-block: clamp(22px, 4vw, 36px) clamp(44px, 7vw, 82px);
}
.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .4;
}
.page-about .about-hero__scrim {
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(180deg, rgba(4, 16, 31, .93) 0%, rgba(4, 16, 31, .58) 44%, rgba(7, 26, 51, .97) 100%),
    radial-gradient(120% 92% at 90% 6%, rgba(255, 90, 31, .2), transparent 58%);
  pointer-events: none;
}
.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
}

.page-about .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(26px, 5vw, 46px);
  padding: 0;
  list-style: none;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--c-silver);
}
.page-about .breadcrumbs__list li {
  display: flex;
  align-items: center;
}
.page-about .breadcrumbs__list li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(185, 194, 204, .5);
}
.page-about .breadcrumbs__list a {
  color: var(--c-silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .breadcrumbs__list a:hover {
  color: var(--c-cyan);
  border-bottom-color: var(--c-cyan);
}
.page-about .breadcrumbs__list [aria-current="page"] {
  color: var(--c-cream);
}

.page-about .about-hero h1 {
  margin: 0;
  max-width: 15em;
  font-family: var(--f-sans);
  font-weight: 900;
  font-size: clamp(29px, 6.2vw, 56px);
  line-height: 1.14;
  letter-spacing: -.022em;
  color: var(--c-cream);
}
.page-about .about-hero .lede {
  margin: clamp(18px, 3vw, 26px) 0 0;
  max-width: 44em;
  font-size: clamp(15.5px, 2.1vw, 18px);
  line-height: 1.88;
  color: rgba(245, 238, 223, .84);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(30px, 5vw, 48px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-rule-dark);
  border: 1px solid var(--about-rule-dark);
}
.page-about .about-hero__stat {
  background: rgba(4, 16, 31, .82);
  padding: 18px 16px;
}
.page-about .about-hero__num {
  display: block;
  font-family: var(--f-mono);
  font-weight: 700;
  font-size: clamp(24px, 5vw, 34px);
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--c-cream);
}
.page-about .about-hero__num em {
  font-style: normal;
  font-size: .58em;
  color: var(--c-orange);
  margin-left: 2px;
}
.page-about .about-hero__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--c-silver);
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  background: var(--c-cream);
  color: var(--c-ink);
  padding-block: clamp(46px, 7vw, 84px);
}
.page-about .about-origin__grid {
  display: grid;
  gap: 32px;
  margin-top: clamp(26px, 4vw, 42px);
}
.page-about .about-origin__body p {
  margin: 0 0 1.1em;
  font-size: clamp(15.5px, 2vw, 17px);
  line-height: 1.9;
  color: rgba(30, 23, 18, .87);
}
.page-about .about-origin__body p:last-child {
  margin-bottom: 0;
}
.page-about .about-note {
  position: relative;
  margin: 0;
  padding: 24px 22px 24px 26px;
  background: var(--about-paper);
  border: 1px solid rgba(30, 23, 18, .18);
  box-shadow: 8px 8px 0 var(--c-paper);
}
.page-about .about-note::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--c-orange);
}
.page-about .about-note__title {
  margin: 0 0 10px;
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-orange);
}
.page-about .about-note p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: rgba(30, 23, 18, .82);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  overflow: hidden;
  background: var(--c-deep);
  color: var(--c-cream);
  padding-block: clamp(46px, 7.5vw, 90px);
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(185, 194, 204, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(185, 194, 204, .07) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
}
.page-about .about-timeline::after {
  content: "";
  position: absolute;
  top: -30%;
  right: -12%;
  width: 58%;
  height: 160%;
  background: linear-gradient(115deg, transparent 42%, rgba(255, 90, 31, .13) 50%, transparent 58%);
  transform: skewX(-8deg);
  pointer-events: none;
}
.page-about .about-timeline .shell {
  position: relative;
  z-index: 1;
}
.page-about .about-timeline .about-sec-title {
  color: var(--c-cream);
}
.page-about .about-timeline .about-sec-lede {
  color: rgba(245, 238, 223, .76);
}

.page-about .about-timeline__list {
  position: relative;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-orange) 0%, var(--c-orange-soft) 34%, var(--c-cyan) 100%);
  opacity: .85;
}
.page-about .tl-item {
  position: relative;
  padding-left: 40px;
  border-bottom: 1px solid var(--about-rule-dark);
}
.page-about .tl-item:first-child {
  border-top: 1px solid var(--about-rule-dark);
}
.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 26px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--c-deep);
  border: 2px solid var(--c-cyan);
  box-shadow: 0 0 0 4px rgba(43, 227, 194, .12);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.page-about .tl-item:has(.tl-node[open])::before {
  background: var(--c-orange);
  border-color: var(--c-orange);
  box-shadow: 0 0 0 4px rgba(255, 90, 31, .2);
}
.page-about .tl-node > summary {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
}
.page-about .tl-node > summary::-webkit-details-marker {
  display: none;
}
.page-about .tl-node > summary:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 3px;
}
.page-about .tl-node__year {
  font-family: var(--f-mono);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--c-orange);
}
.page-about .tl-node__title {
  font-family: var(--f-sans);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.45;
  letter-spacing: -.01em;
  color: var(--c-cream);
  transition: color var(--dur) var(--ease);
}
.page-about .tl-node__mark {
  margin-left: auto;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--c-cyan);
}
.page-about .tl-node__mark::before {
  content: "展开";
}
.page-about .tl-node[open] .tl-node__mark::before {
  content: "收起";
}
.page-about .tl-node[open] .tl-node__title {
  color: var(--c-orange-soft);
}
.page-about .tl-node__body {
  max-width: 60em;
  padding: 2px 0 22px;
}
.page-about .tl-node__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(245, 238, 223, .78);
}

/* ---------- 服务网络 ---------- */
.page-about .about-network {
  background: var(--c-cream);
  color: var(--c-ink);
  padding-block: clamp(46px, 7vw, 86px);
}
.page-about .about-network__figure {
  position: relative;
  margin: clamp(26px, 4vw, 40px) 0 clamp(24px, 4vw, 36px);
  overflow: hidden;
  border: 1px solid var(--about-rule);
  background: var(--c-deep);
}
.page-about .about-network__figure img {
  display: block;
  width: 100%;
  height: clamp(190px, 30vw, 340px);
  object-fit: cover;
}
.page-about .about-network__figure figcaption {
  position: absolute;
  left: 0;
  bottom: 0;
  max-width: 100%;
  padding: 9px 14px;
  background: rgba(4, 16, 31, .82);
  border-top: 1px solid rgba(43, 227, 194, .34);
  border-right: 1px solid rgba(43, 227, 194, .34);
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: .05em;
  line-height: 1.5;
  color: var(--c-cyan);
}

.page-about .about-net__flow {
  display: grid;
  gap: 10px;
  margin: 0 0 clamp(26px, 4vw, 36px);
  padding: 0;
  list-style: none;
}
.page-about .about-net__flow li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  background: rgba(255, 255, 255, .52);
  border-left: 3px solid var(--c-orange);
  font-size: 14.5px;
  line-height: 1.55;
  color: rgba(30, 23, 18, .88);
}
.page-about .about-net__flow li span {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-orange);
  flex: none;
}

.page-about .about-net__list {
  display: grid;
  margin: 0;
  border-top: 1px solid var(--about-rule);
}
.page-about .about-net__row {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--about-rule);
}
.page-about .about-net__row dt {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--c-orange);
}
.page-about .about-net__row dd {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(30, 23, 18, .86);
}

/* ---------- 回访体系 ---------- */
.page-about .about-visit {
  background: var(--c-track);
  color: var(--c-cream);
  padding-block: clamp(46px, 7vw, 86px);
}
.page-about .about-visit__grid {
  display: grid;
  gap: 30px;
}
.page-about .about-visit__figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--about-rule-dark);
}
.page-about .about-visit__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}
.page-about .about-visit__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(140deg, rgba(7, 26, 51, .45), transparent 58%);
  pointer-events: none;
}
.page-about .about-visit .about-sec-title {
  color: var(--c-cream);
}
.page-about .about-visit__body p {
  margin: 14px 0 0;
  font-size: clamp(15px, 2vw, 16.5px);
  line-height: 1.9;
  color: rgba(245, 238, 223, .82);
}
.page-about .about-visit__body a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 227, 194, .45);
  transition: border-color var(--dur) var(--ease);
}
.page-about .about-visit__body a:hover {
  border-bottom-color: var(--c-cyan);
}
.page-about .about-visit__points {
  display: grid;
  gap: 1px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-rule-dark);
  border: 1px solid var(--about-rule-dark);
}
.page-about .about-visit__points li {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  background: rgba(7, 26, 51, .62);
}
.page-about .about-visit__points b {
  font-family: var(--f-mono);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--c-cyan);
}
.page-about .about-visit__points span {
  font-size: 13.5px;
  line-height: 1.65;
  color: rgba(245, 238, 223, .76);
}

/* ---------- 准则与结果 ---------- */
.page-about .about-proof {
  background: var(--c-cream);
  color: var(--c-ink);
  padding-block: clamp(46px, 7vw, 86px);
}
.page-about .about-proof__grid {
  display: grid;
  gap: 32px;
  margin-top: clamp(26px, 4vw, 42px);
}
.page-about .about-proof__paper {
  position: relative;
  padding: 26px 24px;
  background: var(--about-paper);
  border: 1px solid rgba(30, 23, 18, .2);
  box-shadow: 8px 8px 0 var(--c-paper), 16px 16px 0 rgba(230, 220, 200, .45);
}
.page-about .about-proof__paper h3 {
  margin: 0;
  font-family: var(--f-sans);
  font-size: 18px;
  font-weight: 900;
  letter-spacing: -.01em;
}
.page-about .about-proof__rule {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-proof__rule li {
  display: grid;
  gap: 5px;
  padding: 14px 0;
  border-top: 1px dashed rgba(30, 23, 18, .2);
}
.page-about .about-proof__rule strong {
  font-size: 15.5px;
  font-weight: 800;
  letter-spacing: -.005em;
}
.page-about .about-proof__rule span {
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(30, 23, 18, .74);
}
.page-about .about-proof__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}
.page-about .about-proof__stat {
  background: var(--c-cream);
  padding: 20px 16px;
}
.page-about .about-proof__num {
  display: block;
  font-family: var(--f-mono);
  font-weight: 700;
  font-size: clamp(25px, 4.6vw, 33px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--c-deep);
}
.page-about .about-proof__num em {
  font-style: normal;
  font-size: .62em;
  color: var(--c-orange);
  margin-left: 1px;
}
.page-about .about-proof__cap {
  display: block;
  margin-top: 8px;
  font-size: 13.5px;
  line-height: 1.6;
  color: rgba(30, 23, 18, .68);
}
.page-about .about-proof__foot {
  margin: clamp(26px, 4vw, 36px) 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(30, 23, 18, .72);
}
.page-about .about-proof__foot a {
  color: var(--c-orange);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 90, 31, .45);
}
.page-about .about-proof__foot a:hover {
  border-bottom-color: var(--c-orange);
}

/* ---------- 收束 ---------- */
.page-about .about-next {
  position: relative;
  overflow: hidden;
  background: var(--c-abyss);
  color: var(--c-cream);
  padding-block: clamp(50px, 8vw, 96px);
}
.page-about .about-next::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--c-orange) 0%, var(--c-orange-soft) 42%, var(--c-cyan) 100%);
}
.page-about .about-next::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  right: 0;
  width: 46%;
  background: linear-gradient(100deg, transparent, rgba(14, 46, 82, .85));
  transform: skewX(-8deg) translateX(14%);
  pointer-events: none;
}
.page-about .about-next .shell {
  position: relative;
  z-index: 1;
}
.page-about .about-next .about-sec-title {
  color: var(--c-cream);
  max-width: 20em;
}
.page-about .about-next .about-sec-lede {
  color: rgba(245, 238, 223, .8);
  max-width: 42em;
}
.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}
.page-about .about-next .btn--ghost {
  color: var(--c-cream);
  border-color: rgba(245, 238, 223, .45);
  background: transparent;
}
.page-about .about-next .btn--ghost:hover {
  color: var(--c-cyan);
  border-color: var(--c-cyan);
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-visit__points {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-net__flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-net__flow li {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  .page-about .about-net__row {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 26px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .85fr);
    gap: 56px;
    align-items: start;
  }
  .page-about .about-timeline__list::before {
    left: 103px;
  }
  .page-about .tl-item {
    padding-left: 148px;
  }
  .page-about .tl-item::before {
    left: 96px;
    top: 30px;
  }
  .page-about .tl-node > summary {
    padding: 18px 0;
  }
  .page-about .tl-node__year {
    position: absolute;
    left: -148px;
    top: 17px;
    width: 84px;
    text-align: right;
    font-size: 22px;
  }
  .page-about .tl-node__title {
    font-size: 19px;
  }
  .page-about .about-visit__grid {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
    gap: 52px;
    align-items: center;
  }
  .page-about .about-proof__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-item::before,
  .page-about .tl-node__title {
    transition: none;
  }
}