.page-about {
  --ab-pad: clamp(44px, 6vw, 88px);
  --ab-cut: 16px;
  background: var(--ink);
  color: var(--cream);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-mast {
  position: relative;
  padding: clamp(28px, 4vw, 48px) 0 clamp(48px, 7vw, 88px);
  background:
    radial-gradient(120% 90% at 86% 4%, rgba(200, 52, 43, .24), transparent 62%),
    radial-gradient(90% 80% at 4% 100%, rgba(62, 142, 126, .16), transparent 60%),
    linear-gradient(180deg, var(--ink-3), var(--ink));
  border-bottom: 1px solid var(--line);
}

.page-about .about-mast::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(to right, var(--line) 1px, transparent 1px);
  background-size: 88px 100%;
  opacity: .5;
  pointer-events: none;
}

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

.page-about .about-mast .breadcrumb {
  margin-bottom: 22px;
}

.page-about .about-mast .kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-index);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: .22em;
  color: var(--gold);
}

.page-about .about-mast .kicker::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--gold);
}

.page-about .about-mast__h1 {
  margin: 20px 0 0;
  max-width: 17ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 7.2vw, 66px);
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--cream);
}

.page-about .about-mast__lead {
  max-width: 62ch;
  margin: 24px 0 0;
  font-family: var(--font-body);
  font-size: clamp(15px, 1.9vw, 17px);
  line-height: 1.85;
  color: var(--cream-80);
}

.page-about .about-mast__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 38px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-mast__facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  background: rgba(20, 17, 15, .78);
  transition: background var(--ease);
}

.page-about .about-mast__facts li:hover {
  background: rgba(200, 52, 43, .18);
}

.page-about .about-mast__num {
  font-size: clamp(24px, 3.6vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--gold);
}

.page-about .about-mast__k {
  font-family: var(--font-index);
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--cream-60);
}

/* ---------- 外壳与索引栏 ---------- */
.page-about .about-shell {
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-idx {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  margin: 20px 0 4px;
  padding: 0 0 14px;
  border-bottom: 1px solid var(--line);
  scrollbar-width: none;
}

.page-about .about-idx::-webkit-scrollbar {
  display: none;
}

.page-about .about-idx__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  background: rgba(22, 48, 42, .42);
  color: var(--cream-60);
  font-family: var(--font-index);
  font-size: 12.5px;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}

.page-about .about-idx__link .mono {
  font-size: 11px;
  color: var(--stone);
  transition: color var(--ease);
}

.page-about .about-idx__link:hover,
.page-about .about-idx__link[data-active="true"] {
  color: var(--cream);
  border-color: var(--gold-soft);
  background: rgba(200, 52, 43, .2);
}

.page-about .about-idx__link:hover .mono,
.page-about .about-idx__link[data-active="true"] .mono {
  color: var(--gold);
}

/* ---------- 章节通用 ---------- */
.page-about .about-flow {
  padding-top: 4px;
}

.page-about .about-sec {
  padding: var(--ab-pad) 0;
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-family: var(--font-index);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold);
}

.page-about .about-tag .mono {
  color: var(--red);
  letter-spacing: .06em;
}

.page-about .about-h2 {
  margin: 0 0 20px;
  max-width: 24ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4.4vw, 42px);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--cream);
}

.page-about .about-lede {
  max-width: 62ch;
  margin: 0 0 34px;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--cream-80);
}

.page-about .about-sec p {
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--cream-80);
}

/* ---------- 01 品牌由来 ---------- */
.page-about .about-origin__body {
  display: grid;
  gap: 20px;
  max-width: 74ch;
}

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

.page-about .about-origin__meta {
  display: grid;
  gap: 1px;
  margin: 36px 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-origin__meta > div {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  background: rgba(22, 48, 42, .58);
}

.page-about .about-origin__meta dt {
  font-family: var(--font-index);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--stone);
}

.page-about .about-origin__meta dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--cream);
}

.page-about .about-origin__meta dd.mono {
  font-size: 17px;
  font-weight: 700;
  color: var(--gold);
}

/* ---------- 02 时间线 ---------- */
.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl__item {
  position: relative;
  display: grid;
  gap: 6px;
  margin-left: 7px;
  padding: 0 0 34px 30px;
  border-left: 1px solid var(--line);
}

.page-about .tl__item:last-child {
  padding-bottom: 6px;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 6px;
  width: 13px;
  height: 13px;
  background: var(--ink);
  border: 1px solid var(--stone);
  transform: rotate(45deg);
  transition: background var(--ease), border-color var(--ease);
}

.page-about .tl__item:hover::before {
  background: var(--gold);
  border-color: var(--gold);
}

.page-about .tl__item--now::before {
  background: var(--red);
  border-color: var(--gold);
}

.page-about .tl__year {
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--gold);
}

.page-about .tl__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17.5px;
  line-height: 1.4;
  color: var(--cream);
}

.page-about .tl__body p {
  margin: 4px 0 0;
  max-width: 58ch;
}

/* ---------- 03 团队 ---------- */
.page-about .about-crew__fig {
  margin: 0 0 40px;
}

.page-about .about-crew__layout {
  display: grid;
  gap: 36px;
}

.page-about .about-radar {
  position: relative;
  padding: 8px;
  background: radial-gradient(70% 70% at 50% 50%, rgba(22, 48, 42, .9), rgba(20, 17, 15, 0) 72%);
}

.page-about .about-radar__svg {
  display: block;
  width: 100%;
  max-width: 460px;
  height: auto;
  margin-inline: auto;
  overflow: visible;
}

.page-about .about-radar__branch {
  transition: opacity var(--ease);
}

.page-about .about-radar:hover .about-radar__branch:not(:hover) {
  opacity: .32;
}

.page-about .about-radar__line {
  stroke: var(--line-strong);
  stroke-width: 1;
  stroke-dasharray: 4 6;
}

.page-about .about-radar__halo {
  fill: none;
  pointer-events: all;
}

.page-about .about-radar__node {
  fill: var(--ink-2);
  stroke: var(--line-strong);
  stroke-width: 1;
  transition: stroke var(--ease), fill var(--ease);
}

.page-about .about-radar__branch:hover .about-radar__node {
  stroke: var(--gold);
  fill: rgba(217, 164, 65, .18);
}

.page-about .about-radar__core {
  fill: var(--red-deep);
  stroke: var(--gold-soft);
  stroke-width: 1;
}

.page-about .about-radar__num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  fill: var(--cream);
  text-anchor: middle;
  dominant-baseline: central;
}

.page-about .about-radar__num--core {
  font-size: 30px;
  fill: var(--cream);
}

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

.page-about .about-crew__item {
  position: relative;
  padding: 16px 18px 16px 22px;
  background: linear-gradient(180deg, rgba(22, 48, 42, .74), rgba(20, 17, 15, .74));
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--ab-cut)) 0, 100% var(--ab-cut), 100% 100%, 0 100%);
  transition: border-color var(--ease), background var(--ease);
}

.page-about .about-crew__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--jade);
}

.page-about .about-crew__item:nth-child(2)::before { background: var(--amber); }
.page-about .about-crew__item:nth-child(3)::before { background: var(--gold); }
.page-about .about-crew__item:nth-child(4)::before { background: var(--red); }

.page-about .about-crew__item:hover {
  border-color: var(--gold-soft);
  background: linear-gradient(180deg, rgba(200, 52, 43, .16), rgba(20, 17, 15, .8));
}

.page-about .about-crew__name {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--cream);
}

.page-about .about-crew__name .mono {
  font-size: 19px;
  font-weight: 700;
  color: var(--gold);
}

.page-about .about-crew__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
}

/* ---------- 04 流程 ---------- */
.page-about .about-flowchain {
  list-style: none;
  margin: 0 0 40px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-flowchain__item {
  position: relative;
  display: grid;
  gap: 8px;
  align-content: start;
  padding: 20px 18px;
  background: rgba(22, 48, 42, .5);
  border: 1px solid var(--line);
  transition: border-color var(--ease), background var(--ease);
}

.page-about .about-flowchain__item:hover {
  border-color: var(--gold-soft);
  background: rgba(200, 52, 43, .14);
}

.page-about .about-flowchain__no {
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--stone);
}

.page-about .about-flowchain__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--cream);
}

.page-about .about-flowchain__item p {
  margin: 0;
  font-size: 14.5px;
}

.page-about .about-flowchain__meta {
  padding-top: 10px;
  border-top: 1px solid var(--line);
  font-family: var(--font-index);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--clay);
}

.page-about .about-flowchain__item:nth-child(1) .about-flowchain__no { color: var(--stone); }
.page-about .about-flowchain__item:nth-child(2) .about-flowchain__no { color: var(--clay); }
.page-about .about-flowchain__item:nth-child(3) .about-flowchain__no { color: var(--amber); }
.page-about .about-flowchain__item:nth-child(4) .about-flowchain__no { color: var(--red); }

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

/* ---------- 05 合作生态 ---------- */
.page-about .about-partners__layout {
  display: grid;
  gap: 30px;
}

.page-about .about-partners__forms {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-partners__form {
  position: relative;
  padding: 16px 18px 16px 22px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--jade);
  background: rgba(20, 17, 15, .6);
  transition: border-color var(--ease), background var(--ease);
}

.page-about .about-partners__form:nth-child(2) { border-left-color: var(--gold); }
.page-about .about-partners__form:nth-child(3) { border-left-color: var(--amber); }
.page-about .about-partners__form:nth-child(4) { border-left-color: var(--clay); }

.page-about .about-partners__form:hover {
  border-color: var(--gold-soft);
  border-left-color: var(--red);
  background: rgba(200, 52, 43, .13);
}

.page-about .about-partners__name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16.5px;
  color: var(--cream);
}

.page-about .about-partners__form p {
  margin: 0;
  font-size: 14.5px;
}

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

/* ---------- 06 行业认可 ---------- */
.page-about .about-awards__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-awards__item {
  display: grid;
  gap: 8px;
  padding: 20px 20px;
  background: rgba(22, 48, 42, .5);
  transition: background var(--ease);
}

.page-about .about-awards__item:hover {
  background: rgba(200, 52, 43, .16);
}

.page-about .about-awards__yr {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--gold);
}

.page-about .about-awards__item p {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
}

/* ---------- 07 服务地区 ---------- */
.page-about .about-region__grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 6px;
  max-width: 330px;
  margin: 0 0 26px;
}

.page-about .about-region__cell {
  aspect-ratio: 1 / 1;
  background: rgba(140, 132, 121, .14);
  border: 1px solid var(--line);
}

.page-about .about-region__cell.is-on {
  background: linear-gradient(140deg, var(--jade), rgba(62, 142, 126, .3));
  border-color: rgba(62, 142, 126, .7);
}

.page-about .about-region__note {
  max-width: 60ch;
  margin: 0 0 36px;
}

.page-about .about-cta {
  padding: 24px 22px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--red);
  background: linear-gradient(100deg, rgba(200, 52, 43, .16), rgba(20, 17, 15, .3) 62%);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 66ch;
  font-size: 15px;
}

.page-about .about-cta a {
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid var(--gold-soft);
  transition: color var(--ease), border-color var(--ease);
}

.page-about .about-cta a:hover {
  color: var(--cream);
  border-color: var(--red);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-origin__meta {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .tl__item {
    grid-template-columns: 104px minmax(0, 1fr);
    column-gap: 24px;
    padding-bottom: 40px;
  }

  .page-about .tl__year {
    grid-column: 1;
  }

  .page-about .tl__body {
    grid-column: 2;
  }

  .page-about .about-awards__item {
    grid-template-columns: 88px minmax(0, 1fr);
    align-items: baseline;
    column-gap: 20px;
  }
}

@media (min-width: 900px) {
  .page-about .about-origin__body {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-crew__layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
    gap: 44px;
  }

  .page-about .about-partners__layout {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
    gap: 36px;
  }

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

  .page-about .about-flowchain__item + .about-flowchain__item {
    border-left: 0;
  }

  .page-about .about-flowchain__item:not(:last-child)::after {
    content: "";
    position: absolute;
    right: -10px;
    top: 50%;
    width: 0;
    height: 0;
    transform: translateY(-50%);
    border-top: 10px solid transparent;
    border-bottom: 10px solid transparent;
    border-left: 10px solid var(--stone);
    z-index: 2;
  }

  .page-about .about-flowchain__item:nth-child(2)::after { border-left-color: var(--clay); }
  .page-about .about-flowchain__item:nth-child(3)::after { border-left-color: var(--amber); }
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: 96px minmax(0, 1fr);
    column-gap: 40px;
  }

  .page-about .about-idx {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    margin: 0;
    padding: 6px 0 6px 16px;
    border-bottom: 0;
    border-left: 1px solid var(--line);
    position: sticky;
    top: calc(var(--hdr-h) + 24px);
    align-self: start;
  }

  .page-about .about-idx__link {
    border: 0;
    border-left: 2px solid transparent;
    background: none;
    padding: 8px 0 8px 10px;
    margin-left: -16px;
    white-space: normal;
  }

  .page-about .about-idx__link:hover,
  .page-about .about-idx__link[data-active="true"] {
    border-left-color: var(--red);
    background: linear-gradient(90deg, rgba(200, 52, 43, .18), transparent);
  }

  .page-about .about-region__grid {
    max-width: 380px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: .01ms !important;
  }
}