.page-about {
  --about-gap: clamp(18px, 3vw, 32px);
  --about-cut: 14px;
  background: var(--c-paper);
  color: var(--c-ink);
  overflow-x: hidden;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 5vw, 64px) 0 clamp(30px, 5vw, 56px);
  background:
    radial-gradient(118% 88% at 92% 4%, rgba(0, 160, 122, 0.15), transparent 58%),
    radial-gradient(86% 72% at -6% 104%, rgba(14, 76, 146, 0.13), transparent 62%),
    var(--c-paper);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  align-items: center;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(2rem, 6.6vw, 3.5rem);
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: -0.012em;
  color: var(--c-ink);
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 42ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--c-ink);
}

.page-about .about-hero__facts {
  display: grid;
  gap: 14px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-fact {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-left: 14px;
  border-left: 3px solid var(--c-peacock);
}

.page-about .about-fact__num {
  font-size: clamp(1.5rem, 4.4vw, 2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--c-plateau);
  font-variant-numeric: tabular-nums;
}

.page-about .about-fact__label {
  font-size: 14px;
  line-height: 1.6;
  color: var(--c-steel);
}

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

/* 首屏右侧：情报台面板 */
.page-about .about-hero__console {
  position: relative;
  padding: clamp(20px, 3vw, 30px) clamp(18px, 3vw, 28px) clamp(18px, 3vw, 26px);
  background: linear-gradient(158deg, var(--c-night) 0%, var(--c-plateau-deep) 100%);
  border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow: 0 30px 64px -38px rgba(8, 28, 51, 0.92);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, var(--about-cut) 100%, 0 calc(100% - var(--about-cut)));
  overflow: hidden;
}

.page-about .about-hero__console::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-amber), var(--c-peacock) 55%, transparent);
}

.page-about .about-hero__console-title {
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-amber);
}

.page-about .about-hero__rows {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.16);
}

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

.page-about .about-hero__row .status {
  color: rgba(255, 255, 255, 0.9);
  font-size: 15px;
}

.page-about .about-hero__row-num {
  font-size: 15px;
  color: #fff;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.page-about .about-hero__trace {
  display: block;
  width: 100%;
  height: 66px;
  margin-top: 14px;
}

.page-about .about-hero__trace path {
  fill: none;
  stroke: var(--c-peacock);
  stroke-width: 2;
  stroke-linecap: round;
  opacity: 0.85;
  animation: about-trace 12s linear infinite;
}

.page-about .about-hero__trace circle {
  fill: var(--c-amber);
  opacity: 0.9;
}

.page-about .about-hero__console-note {
  margin: 12px 0 0;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.55);
  font-family: var(--font-mono);
}

@keyframes about-trace {
  0% { stroke-dasharray: 8 12; stroke-dashoffset: 0; }
  100% { stroke-dasharray: 8 12; stroke-dashoffset: -160; }
}

/* ============ 时间轴 ============ */
.page-about .about-story {
  background: var(--c-card);
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-timeline {
  display: grid;
  gap: 0;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 26px 26px;
  border-left: 2px solid var(--c-line);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 4px;
  width: 14px;
  height: 14px;
  background: var(--c-card);
  border: 2px solid var(--c-plateau);
  transition: background var(--t-fast) ease, border-color var(--t-fast) ease, box-shadow var(--t-fast) ease;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 4px;
  border-left-color: transparent;
}

.page-about .about-timeline__item:last-child::before {
  left: -16px;
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  background: var(--c-amber);
  border-color: var(--c-amber);
  box-shadow: 0 0 0 5px rgba(255, 176, 33, 0.22);
}

.page-about .about-timeline__year {
  display: inline-block;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-peacock);
  font-variant-numeric: tabular-nums;
}

.page-about .about-timeline__title {
  margin: 6px 0 0;
  font-size: clamp(1.05rem, 3vw, 1.35rem);
  font-weight: 800;
  line-height: 1.4;
  color: var(--c-ink);
}

.page-about .about-timeline__detail p {
  margin: 8px 0 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-steel);
}

/* ============ 三条选型标准 ============ */
.page-about .about-standards {
  background: var(--c-paper);
}

.page-about .about-standards__list {
  margin-top: clamp(22px, 3.5vw, 38px);
}

.page-about .about-standard {
  display: flex;
  gap: 16px;
  padding: 24px 0;
  border-top: 1px solid var(--c-line);
}

.page-about .about-standard:last-child {
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-standard__no {
  flex: 0 0 auto;
  min-width: 40px;
  padding-top: 3px;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--c-plateau);
  opacity: 0.45;
  font-variant-numeric: tabular-nums;
}

.page-about .about-standard__title {
  margin: 0;
  font-size: clamp(1.02rem, 2.8vw, 1.24rem);
  font-weight: 800;
  line-height: 1.5;
  color: var(--c-ink);
}

.page-about .about-standard__body p {
  margin: 10px 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--c-ink);
  max-width: 52ch;
}

.page-about .about-standard__case {
  padding: 12px 14px;
  background: rgba(0, 160, 122, 0.07);
  border-left: 3px solid var(--c-peacock);
  font-size: 15px;
  color: var(--c-ink);
}

.page-about .about-standard__case strong {
  color: var(--c-peacock-deep);
}

/* ============ 区域 ============ */
.page-about .about-regions {
  background: var(--c-card);
  border-top: 1px solid var(--c-line);
}

.page-about .about-regions__figure {
  margin: clamp(22px, 3.5vw, 38px) 0 0;
}

.page-about .about-regions__tabs {
  margin-top: clamp(24px, 3.5vw, 36px);
}

.page-about .about-regions__tabs .tabs__list {
  display: flex;
  flex-wrap: nowrap;
  gap: 8px;
  overflow-x: auto;
  padding: 4px 2px 12px;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-about .about-regions__tabs .tabs__btn {
  flex: 0 0 auto;
  appearance: none;
  border: 1px solid var(--c-line);
  background: var(--c-card);
  color: var(--c-ink);
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  padding: 10px 20px;
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 9px) 0, 100% 9px, 100% 100%, 9px 100%, 0 calc(100% - 9px));
  transition: background var(--t-fast) ease, color var(--t-fast) ease, border-color var(--t-fast) ease;
}

.page-about .about-regions__tabs .tabs__btn:hover {
  border-color: var(--c-peacock);
  color: var(--c-peacock-deep);
}

.page-about .about-regions__tabs .tabs__btn[aria-selected="true"] {
  color: #08192b;
  border-color: transparent;
  background: var(--c-plateau);
}

.page-about .about-regions__tabs .tabs__btn[data-tab="central"][aria-selected="true"] { background: var(--r-central); }
.page-about .about-regions__tabs .tabs__btn[data-tab="east"][aria-selected="true"] { background: var(--r-east); }
.page-about .about-regions__tabs .tabs__btn[data-tab="south"][aria-selected="true"] { background: var(--r-south); }
.page-about .about-regions__tabs .tabs__btn[data-tab="west"][aria-selected="true"] { background: var(--r-west); }
.page-about .about-regions__tabs .tabs__btn[data-tab="nw"][aria-selected="true"] { background: var(--r-nw); }
.page-about .about-regions__tabs .tabs__btn[data-tab="out"][aria-selected="true"] { background: var(--r-out); }

.page-about .about-regions__tabs .tabs__panel {
  margin-top: 8px;
  background: var(--c-card);
  border: 1px solid var(--c-line);
  border-left: 6px solid var(--rc, var(--c-plateau));
  padding: clamp(18px, 3vw, 30px);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, var(--about-cut) 100%, 0 calc(100% - var(--about-cut)));
}

.page-about .about-regions__tabs .tabs__panel[data-tab-panel="central"] { --rc: var(--r-central); }
.page-about .about-regions__tabs .tabs__panel[data-tab-panel="east"] { --rc: var(--r-east); }
.page-about .about-regions__tabs .tabs__panel[data-tab-panel="south"] { --rc: var(--r-south); }
.page-about .about-regions__tabs .tabs__panel[data-tab-panel="west"] { --rc: var(--r-west); }
.page-about .about-regions__tabs .tabs__panel[data-tab-panel="nw"] { --rc: var(--r-nw); }
.page-about .about-regions__tabs .tabs__panel[data-tab-panel="out"] { --rc: var(--r-out); }

.page-about .about-region__cities {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 16px;
}

.page-about .about-region__desc {
  margin: 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-ink);
}

.page-about .about-region__list {
  display: grid;
  gap: 10px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-region__list li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--c-steel);
}

.page-about .about-region__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  background: var(--rc, var(--c-peacock));
}

/* ============ 团队 ============ */
.page-about .about-team {
  background: var(--c-paper);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .about-team__lead {
  margin: 14px 0 0;
  max-width: 46ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--c-ink);
}

.page-about .about-flow {
  display: grid;
  gap: 0;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: about-flow;
}

.page-about .about-flow__item {
  display: flex;
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--c-line);
}

.page-about .about-flow__item:last-child {
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-flow__no {
  flex: 0 0 auto;
  min-width: 30px;
  font-size: 13px;
  font-weight: 700;
  color: var(--c-amber);
  background: var(--c-night);
  height: 24px;
  line-height: 24px;
  text-align: center;
  clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 6px, 100% 100%, 6px 100%, 0 calc(100% - 6px));
}

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

.page-about .about-team__note {
  margin: 20px 0 0;
  padding: 14px 16px;
  background: rgba(14, 76, 146, 0.06);
  border-left: 3px solid var(--c-plateau);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--c-ink);
}

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

/* ============ 质保与服务 ============ */
.page-about .about-service {
  background: linear-gradient(170deg, var(--c-night) 0%, var(--c-plateau-deep) 100%);
  color: #EAF1F8;
}

.page-about .about-service__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .about-service .section-title {
  color: #FFFFFF;
}

.page-about .about-service__lead {
  margin: 14px 0 0;
  max-width: 46ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: rgba(234, 241, 248, 0.82);
}

.page-about .section-tag--onDark {
  color: var(--c-amber);
  border-color: rgba(255, 176, 33, 0.42);
}

.page-about .about-service .accordion {
  margin-top: 26px;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
}

.page-about .about-service .accordion__item {
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
}

.page-about .about-service .accordion__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  padding: 18px 0;
  background: transparent;
  border: 0;
  color: #FFFFFF;
  font-family: inherit;
  font-size: 16px;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
}

.page-about .about-service .accordion__trigger:hover {
  color: var(--c-amber);
}

.page-about .about-service .accordion__icon {
  flex: 0 0 auto;
  position: relative;
  width: 18px;
  height: 18px;
  border: 2px solid var(--c-peacock);
  clip-path: polygon(0 0, calc(100% - 5px) 0, 100% 5px, 100% 100%, 5px 100%, 0 calc(100% - 5px));
}

.page-about .about-service .accordion__icon::before,
.page-about .about-service .accordion__icon::after {
  content: "";
  position: absolute;
  background: var(--c-peacock);
}

.page-about .about-service .accordion__icon::before {
  left: 3px;
  right: 3px;
  top: 6px;
  height: 2px;
}

.page-about .about-service .accordion__icon::after {
  top: 3px;
  bottom: 3px;
  left: 6px;
  width: 2px;
  transition: transform var(--t-fast) ease;
}

.page-about .about-service .accordion__item[data-open] .accordion__icon::after {
  transform: scaleY(0);
}

.page-about .about-service .accordion__panel {
  color: rgba(234, 241, 248, 0.78);
}

.page-about .about-service .accordion__body p {
  margin: 0 0 18px;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.85;
}

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

/* ============ 合作方式 ============ */
.page-about .about-partner {
  background: var(--c-paper);
}

.page-about .about-partner__grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(22px, 3.5vw, 38px);
}

.page-about .about-partner__card {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--c-card);
  border: 1px solid var(--c-line);
  border-top: 5px solid var(--c-plateau);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, var(--about-cut) 100%, 0 calc(100% - var(--about-cut)));
  transition: transform var(--t-fast) ease, box-shadow var(--t-fast) ease;
}

.page-about .about-partner__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 22px 44px -30px rgba(8, 28, 51, 0.6);
}

.page-about .about-partner__card--a { border-top-color: var(--c-amber); }
.page-about .about-partner__card--b { border-top-color: var(--c-peacock); }
.page-about .about-partner__card--c { border-top-color: var(--c-plateau); }
.page-about .about-partner__card--d { border-top-color: var(--c-coral); }

.page-about .about-partner__card h3 {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--c-ink);
}

.page-about .about-partner__card p {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--c-steel);
}

.page-about .about-partner__support {
  margin-top: clamp(26px, 4vw, 44px);
  padding: clamp(20px, 3vw, 32px);
  background: var(--c-card);
  border: 1px solid var(--c-line);
  border-left: 6px solid var(--c-peacock);
}

.page-about .about-partner__support-title {
  margin: 0 0 16px;
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--c-ink);
}

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

.page-about .about-partner__support-list li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-ink);
}

.page-about .about-partner__support-list .mono {
  flex: 0 0 auto;
  font-size: 13px;
  font-weight: 700;
  color: var(--c-peacock-deep);
  font-variant-numeric: tabular-nums;
}

.page-about .about-partner__record {
  margin-top: clamp(22px, 3.5vw, 34px);
  padding: 20px 0 0;
  border-top: 2px solid var(--c-line);
}

.page-about .about-partner__record p {
  margin: 0;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--c-ink);
}

.page-about .about-partner__record strong {
  color: var(--c-plateau);
}

.page-about .about-partner__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 26px;
  margin-top: 18px !important;
}

.page-about .about-partner__links a {
  font-size: 15px;
  font-weight: 700;
  color: var(--c-peacock-deep);
  text-decoration: none;
  border-bottom: 2px solid rgba(0, 160, 122, 0.35);
  padding-bottom: 2px;
  transition: border-color var(--t-fast) ease, color var(--t-fast) ease;
}

.page-about .about-partner__links a:hover {
  color: var(--c-plateau);
  border-bottom-color: var(--c-amber);
}

/* ============ 收尾 ============ */
.page-about .about-cta {
  background: var(--c-paper);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 22px;
  padding: clamp(24px, 4vw, 44px);
  background: var(--c-card);
  border: 1px solid var(--c-line);
  border-top: 6px solid var(--c-amber);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
}

.page-about .about-cta__text h2 {
  margin: 0;
  font-size: clamp(1.35rem, 4vw, 2rem);
  line-height: 1.35;
  font-weight: 900;
  color: var(--c-ink);
}

.page-about .about-cta__text p {
  margin: 12px 0 0;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-steel);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ============ 断点 ============ */
@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-fact {
    display: grid;
    gap: 8px;
  }

  .page-about .about-partner__grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-partner__card--a { grid-column: span 3; }
  .page-about .about-partner__card--b { grid-column: span 3; }
  .page-about .about-partner__card--c { grid-column: span 2; }
  .page-about .about-partner__card--d { grid-column: span 4; }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 120px minmax(0, 1fr);
    column-gap: 26px;
    padding-left: 30px;
  }

  .page-about .about-timeline__year {
    grid-row: 1 / span 2;
    padding-top: 6px;
    font-size: 17px;
  }

  .page-about .about-timeline__title {
    margin-top: 0;
  }

  .page-about .about-timeline__detail {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows var(--t-mid) ease;
  }

  .page-about .about-timeline__detail > p {
    overflow: hidden;
    margin-top: 0;
    opacity: 0;
    transition: opacity var(--t-mid) ease, margin-top var(--t-mid) ease;
  }

  .page-about .about-timeline__item:is(:hover, :focus-within) .about-timeline__detail {
    grid-template-rows: 1fr;
  }

  .page-about .about-timeline__item:is(:hover, :focus-within) .about-timeline__detail > p {
    margin-top: 8px;
    opacity: 1;
  }

  .page-about .about-standard {
    display: grid;
    grid-template-columns: 78px minmax(0, 1fr);
    gap: 24px;
    padding: 30px 0;
  }

  .page-about .about-standard__no {
    font-size: 1.9rem;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .about-service__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }

  .page-about .about-team__figure,
  .page-about .about-service__figure {
    position: sticky;
    top: 96px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__trace path {
    animation: none;
  }

  .page-about .about-partner__card:hover {
    transform: none;
  }
}
</main>