.page-about {
  --about-line: rgba(107, 74, 47, 0.5);
  --about-gold-soft: rgba(201, 162, 39, 0.14);
  --about-gold-strong: rgba(201, 162, 39, 0.42);
  --about-card: linear-gradient(158deg, rgba(21, 23, 29, 0.96), rgba(11, 12, 16, 0.92));
  display: block;
  overflow-x: clip;
}

/* ---------- 顶部 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(46px, 7vw, 96px) 0 clamp(38px, 5vw, 68px);
  isolation: isolate;
}

.page-about .hero-aura {
  position: absolute;
  top: -18%;
  right: -12%;
  width: min(720px, 80%);
  height: 560px;
  background: radial-gradient(closest-side, rgba(201, 162, 39, 0.16), rgba(201, 162, 39, 0) 72%);
  pointer-events: none;
  z-index: -1;
}

.page-about .hero-grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: center;
  margin-top: clamp(22px, 3vw, 38px);
}

.page-about h1 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.85rem, 4.4vw, 3rem);
  line-height: 1.24;
  letter-spacing: -0.015em;
  color: var(--paper);
  margin: 14px 0 0;
  max-width: 19ch;
}

.page-about .hero-lead {
  margin: 20px 0 0;
  max-width: 56ch;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(243, 238, 228, 0.78);
}

.page-about .hero-facts {
  list-style: none;
  margin: 30px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--about-line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.page-about .hero-facts li {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .fact-num {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--gold-bright);
}

.page-about .fact-label {
  font-size: 0.8125rem;
  letter-spacing: 0.05em;
  color: var(--mist);
}

.page-about .hero-visual {
  margin: 0;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--about-gold-soft);
}

.page-about .hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

/* ---------- 主体两栏 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(28px, 4vw, 54px);
  padding-top: clamp(34px, 5vw, 62px);
}

.page-about .chapter-rail {
  padding: 18px;
  border: 1px solid var(--about-gold-soft);
  border-radius: var(--radius-lg);
  background: linear-gradient(165deg, rgba(21, 23, 29, 0.92), rgba(11, 12, 16, 0.72));
}

.page-about .rail-title {
  margin: 0 0 12px;
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .chapter-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .chapter-list a {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 9px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-size: 0.9375rem;
  white-space: nowrap;
  text-decoration: none;
  color: rgba(243, 238, 228, 0.76);
  transition: color 0.22s var(--ease), background 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .chapter-list a:hover,
.page-about .chapter-list a:focus-visible {
  color: var(--gold-bright);
  background: rgba(201, 162, 39, 0.08);
  border-color: var(--about-gold-soft);
}

.page-about .chapter-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--gold);
}

.page-about .about-flow {
  min-width: 0;
}

/* ---------- 区块节奏 ---------- */
.page-about .flow-section {
  padding-bottom: clamp(52px, 7vw, 92px);
  margin-bottom: clamp(46px, 6vw, 84px);
  border-bottom: 1px solid var(--about-line);
}

.page-about .flow-section:last-of-type {
  border-bottom: 0;
  margin-bottom: clamp(28px, 4vw, 48px);
  padding-bottom: 0;
}

.page-about .section-head {
  max-width: 62ch;
}

.page-about h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.55rem, 3vw, 2.1rem);
  line-height: 1.3;
  letter-spacing: -0.012em;
  color: var(--paper);
  margin: 12px 0 0;
}

.page-about .lead {
  margin: 16px 0 0;
  font-size: 0.975rem;
  line-height: 1.85;
  color: rgba(243, 238, 228, 0.72);
}

/* ---------- 时间线 ---------- */
.page-about .hall-timeline {
  list-style: none;
  margin: clamp(30px, 4vw, 46px) 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(16px, 2.2vw, 26px);
}

.page-about .tl-node {
  position: relative;
  padding-left: 30px;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 24px;
  bottom: -26px;
  width: 1px;
  background: linear-gradient(180deg, var(--about-gold-soft), rgba(107, 74, 47, 0.3));
}

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

.page-about .tl-dot {
  position: absolute;
  left: 2px;
  top: 20px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  border: 1px solid var(--gold);
  background: var(--ink);
  box-shadow: 0 0 0 4px rgba(201, 162, 39, 0.08);
  transition: background 0.25s var(--ease), box-shadow 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .tl-node:hover .tl-dot,
.page-about .tl-node:focus-within .tl-dot {
  background: var(--gold-bright);
  border-color: var(--gold-bright);
  box-shadow: 0 0 0 6px rgba(241, 213, 130, 0.16);
}

.page-about .tl-card {
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px solid var(--about-gold-soft);
  border-radius: var(--radius-lg);
  background: var(--about-card);
  transition: border-color 0.28s var(--ease);
}

.page-about .tl-node:hover .tl-card,
.page-about .tl-node:focus-within .tl-card {
  border-color: var(--about-gold-strong);
}

.page-about .tl-head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 1.9rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--gold-bright);
}

.page-about .tl-card h3 {
  margin: 13px 0 0;
  font-family: var(--font-head);
  font-size: 1.075rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .tl-card > p {
  margin: 10px 0 0;
  font-size: 0.9375rem;
  line-height: 1.82;
  color: rgba(243, 238, 228, 0.68);
}

.page-about .tl-extra {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  margin-top: 0;
  transition: grid-template-rows 0.38s var(--ease), opacity 0.3s var(--ease), margin-top 0.3s var(--ease);
}

.page-about .tl-extra-inner {
  overflow: hidden;
}

.page-about .tl-node:hover .tl-extra,
.page-about .tl-node:focus-within .tl-extra {
  grid-template-rows: 1fr;
  opacity: 1;
  margin-top: 15px;
}

.page-about .tl-extra-label {
  margin: 0 0 6px;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .tl-extra-inner p:last-child {
  margin: 0;
  padding-top: 11px;
  border-top: 1px dashed var(--about-line);
  font-size: 0.875rem;
  line-height: 1.78;
  color: rgba(243, 238, 228, 0.6);
}

/* ---------- 值守分工 ---------- */
.page-about .team-split {
  display: grid;
  gap: clamp(26px, 3.4vw, 44px);
  margin-top: clamp(30px, 4vw, 46px);
}

.page-about .role-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .role-item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding: 22px 0;
  border-top: 1px solid var(--about-line);
}

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

.page-about .role-idx {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--gold);
  padding-top: 4px;
}

.page-about .role-body h3 {
  margin: 0;
  font-family: var(--font-head);
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .role-body p {
  margin: 9px 0 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(243, 238, 228, 0.68);
}

.page-about .team-figure {
  margin: 0;
}

.page-about .team-figure .media-frame {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--about-gold-soft);
  aspect-ratio: 4 / 3;
}

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

.page-about .team-figure figcaption {
  margin-top: 14px;
  padding-left: 12px;
  border-left: 2px solid var(--about-gold-soft);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .duty-strip {
  margin-top: clamp(28px, 3.6vw, 44px);
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .duty-col {
  padding: 20px 18px;
  background: linear-gradient(160deg, rgba(21, 23, 29, 0.94), rgba(11, 12, 16, 0.88));
}

.page-about .duty-k {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .duty-v {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 1.02rem;
  letter-spacing: -0.01em;
  color: var(--gold-bright);
}

/* ---------- 服务准则 ---------- */
.page-about .rule-grid {
  margin-top: clamp(30px, 4vw, 46px);
  display: grid;
  gap: 14px;
}

.page-about .rule-card {
  border: 1px solid var(--about-gold-soft);
  border-radius: var(--radius-lg);
  background: var(--about-card);
  overflow: hidden;
  transition: border-color 0.26s var(--ease);
}

.page-about .rule-card[open] {
  border-color: var(--about-gold-strong);
}

.page-about .rule-card summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) 20px;
  align-items: center;
  gap: 12px;
  padding: 20px;
  font-family: var(--font-head);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .rule-card summary::-webkit-details-marker {
  display: none;
}

.page-about .rule-card summary:focus-visible {
  outline: 1px solid var(--gold);
  outline-offset: -3px;
}

.page-about .rule-idx {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--gold);
}

.page-about .rule-cue {
  position: relative;
  justify-self: end;
  width: 14px;
  height: 14px;
}

.page-about .rule-cue::before,
.page-about .rule-cue::after {
  content: "";
  position: absolute;
  background: var(--gold);
  transition: transform 0.26s var(--ease);
}

.page-about .rule-cue::before {
  left: 0;
  top: 6.5px;
  width: 14px;
  height: 1.5px;
}

.page-about .rule-cue::after {
  left: 6.5px;
  top: 0;
  width: 1.5px;
  height: 14px;
}

.page-about .rule-card[open] .rule-cue::after {
  transform: scaleY(0);
}

.page-about .rule-body {
  padding: 0 20px 22px;
}

.page-about .rule-body p {
  margin: 0;
  padding-top: 15px;
  border-top: 1px solid var(--about-gold-soft);
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(243, 238, 228, 0.7);
}

/* ---------- 年度使用报告 ---------- */
.page-about .report-top {
  margin-top: clamp(30px, 4vw, 46px);
  display: grid;
  gap: clamp(18px, 3vw, 30px);
}

.page-about .report-cover {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--about-gold-soft);
}

.page-about .report-cover img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .report-ring-card {
  padding: clamp(20px, 2.6vw, 28px);
  border: 1px solid var(--about-gold-soft);
  border-radius: var(--radius-lg);
  background: var(--about-card);
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .ring-kicker {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .ring-wrap {
  position: relative;
  width: min(214px, 64%);
  margin: 0 auto;
}

.page-about .ring {
  display: block;
  width: 100%;
  height: auto;
  transform: rotate(-90deg);
  transform-origin: 50% 50%;
}

.page-about .ring-track {
  fill: none;
  stroke: rgba(107, 74, 47, 0.42);
  stroke-width: 16;
}

.page-about .ring-seg {
  fill: none;
  stroke-width: 16;
}

.page-about .ring-seg--old {
  stroke: var(--gold);
}

.page-about .ring-seg--rest {
  stroke: var(--glaze);
  opacity: 0.72;
}

.page-about .ring-center {
  position: absolute;
  inset: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  text-align: center;
}

.page-about .ring-num {
  font-family: var(--font-mono);
  font-size: clamp(1.55rem, 3.4vw, 2.05rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--gold-bright);
}

.page-about .ring-sub {
  font-size: 0.8125rem;
  color: var(--mist);
}

.page-about .ring-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.875rem;
  color: rgba(243, 238, 228, 0.72);
}

.page-about .ring-legend li {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .dot {
  flex: none;
  width: 9px;
  height: 9px;
  border-radius: 50%;
}

.page-about .dot--gold {
  background: var(--gold);
}

.page-about .dot--glaze {
  background: var(--glaze);
}

.page-about .report-points {
  list-style: none;
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .report-points li {
  padding-top: 18px;
  border-top: 1px solid var(--about-line);
}

.page-about .report-points h3 {
  margin: 0;
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .report-points p {
  margin: 10px 0 0;
  font-size: 0.875rem;
  line-height: 1.8;
  color: rgba(243, 238, 228, 0.66);
}

.page-about .stat-grid {
  margin-top: clamp(24px, 3vw, 34px);
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .stat-cell {
  padding: 22px 18px;
  background: linear-gradient(160deg, rgba(21, 23, 29, 0.94), rgba(11, 12, 16, 0.88));
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--gold-bright);
}

.page-about .stat-label {
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 协作伙伴 ---------- */
.page-about .partner-rail {
  list-style: none;
  margin: clamp(30px, 4vw, 46px) 0 0;
  padding: 0 0 12px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(236px, 76%);
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .partner-rail::-webkit-scrollbar {
  height: 4px;
}

.page-about .partner-rail::-webkit-scrollbar-thumb {
  background: var(--about-gold-strong);
  border-radius: 999px;
}

.page-about .partner-card {
  scroll-snap-align: start;
  padding: 22px 20px;
  border: 1px solid var(--about-gold-soft);
  border-radius: var(--radius-lg);
  background: var(--about-card);
  display: flex;
  flex-direction: column;
  gap: 7px;
  transition: transform 0.28s var(--ease), border-color 0.28s var(--ease);
}

.page-about .partner-card:hover {
  transform: translateY(-3px);
  border-color: var(--about-gold-strong);
}

.page-about .partner-count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--gold-bright);
}

.page-about .partner-card h3 {
  margin: 0;
  font-family: var(--font-head);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .partner-since {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--jade);
}

.page-about .partner-desc {
  margin: 6px 0 0;
  font-size: 0.875rem;
  line-height: 1.72;
  color: rgba(243, 238, 228, 0.64);
}

/* ---------- 收束 ---------- */
.page-about .next-step {
  position: relative;
  overflow: hidden;
  margin-top: clamp(14px, 2vw, 24px);
  padding: clamp(24px, 3.4vw, 38px);
  border: 1px solid var(--about-gold-soft);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(120% 160% at 10% 0%, rgba(201, 162, 39, 0.13), rgba(21, 23, 29, 0) 58%),
    linear-gradient(150deg, rgba(21, 23, 29, 0.96), rgba(11, 12, 16, 0.9));
}

.page-about .next-step::after {
  content: "";
  position: absolute;
  right: -56px;
  bottom: -70px;
  width: 210px;
  height: 210px;
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(47, 164, 138, 0.16), rgba(47, 164, 138, 0) 72%);
  pointer-events: none;
}

.page-about .next-step h2 {
  margin: 0;
  font-size: clamp(1.22rem, 2.4vw, 1.6rem);
}

.page-about .next-step p {
  margin: 12px 0 0;
  max-width: 58ch;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(243, 238, 228, 0.72);
}

.page-about .next-links {
  position: relative;
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 700px) {
  .page-about .duty-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .partner-rail {
    grid-auto-flow: row;
    grid-template-columns: repeat(auto-fit, minmax(228px, 1fr));
    overflow: visible;
    padding-bottom: 0;
  }
}

@media (min-width: 760px) {
  .page-about .report-points {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .rule-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .report-top {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: stretch;
  }
}

@media (min-width: 880px) {
  .page-about .team-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .hero-visual img {
    -webkit-mask-image: linear-gradient(100deg, rgba(0, 0, 0, 0.5) 0%, #000 44%);
    mask-image: linear-gradient(100deg, rgba(0, 0, 0, 0.5) 0%, #000 44%);
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: 226px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .chapter-rail {
    position: sticky;
    top: 126px;
    align-self: start;
  }

  .page-about .chapter-list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
  }

  .page-about .chapter-list a {
    border-radius: 10px;
  }

  .page-about .stat-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (max-width: 999px) {
  .page-about .stat-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 460px) {
  .page-about .role-item {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 10px;
  }

  .page-about .tl-card {
    padding: 16px;
  }

  .page-about .rule-card summary {
    padding: 17px 16px;
    grid-template-columns: 32px minmax(0, 1fr) 18px;
  }

  .page-about .rule-body {
    padding: 0 16px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-extra,
  .page-about .tl-dot,
  .page-about .tl-card,
  .page-about .partner-card,
  .page-about .rule-cue::before,
  .page-about .rule-cue::after,
  .page-about .chapter-list a {
    transition: none;
  }
}