/* ===== 品牌介绍页 · 页面作用域 ===== */
.page-about {
  --about-body: #BFCBDE;
  --about-line: rgba(200, 145, 58, .32);
  display: block;
}

.page-about .content-container {
  width: 100%;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--sans);
  color: var(--silver);
  margin: 0;
}

.page-about p {
  margin: 0 0 1.2em;
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.85;
  color: var(--about-body);
}

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

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin-bottom: 40px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--silver-dim);
}

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

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--gold-soft);
  border-bottom-color: var(--gold-dim);
}

.page-about .breadcrumb-sep {
  margin: 0 .6em;
  color: var(--gold-dim);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 40px 0 88px;
  background:
    radial-gradient(120% 100% at 88% 0%, rgba(200, 145, 58, .12), transparent 58%),
    linear-gradient(180deg, var(--c-base) 0%, var(--c-deep) 100%);
  border-bottom: 1px solid var(--hairline);
}

.page-about .about-hero-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
}

.page-about .about-hero-copy .annotation {
  display: block;
  margin-bottom: 18px;
  font-size: 12.5px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--gold-soft);
}

.page-about .about-hero h1 {
  font-size: 32px;
  line-height: 1.22;
  letter-spacing: .04em;
  font-weight: 700;
  margin-bottom: 22px;
}

.page-about .about-hero .lede {
  font-size: 18px;
  line-height: 1.7;
  color: var(--silver);
  margin-bottom: 1em;
}

.page-about .about-hero-body {
  color: var(--silver-dim);
  font-size: 16px;
}

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

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 36px 0 0;
  padding: 0;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}

.page-about .about-fact {
  background: var(--c-base);
  padding: 16px 18px;
}

.page-about .about-fact dt {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--silver-dim);
  margin-bottom: 8px;
}

.page-about .about-fact dd {
  margin: 0;
  font-family: var(--sans);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: .03em;
  color: var(--gold-soft);
}

.page-about .about-hero-visual {
  position: relative;
  padding: 24px 0 0;
}

.page-about .ridge-svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .ridge-grid line {
  stroke: rgba(78, 107, 114, .30);
  stroke-width: 1;
}

.page-about .ridge-line {
  fill: none;
  stroke: var(--gold-dim);
  stroke-width: 1.6;
}

.page-about .ridge-line--soft {
  stroke: var(--ridge);
  stroke-width: 1.2;
}

.page-about .ridge-line--faint {
  stroke: var(--ridge);
  stroke-width: 1;
  opacity: .5;
}

.page-about .ridge-nodes circle {
  fill: var(--gold);
}

.page-about .ridge-labels text {
  fill: var(--silver-dim);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .08em;
}

.page-about .about-hero-caption {
  margin: 8px 0 0;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--silver-dim);
  text-align: right;
}

/* ---------- 通用章节标题 ---------- */
.page-about .section {
  padding: 72px 0;
}

.page-about .section--tight {
  padding: 56px 0;
}

.page-about .section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 36px;
}

.page-about .section-num {
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--gold);
  border: 1px solid var(--about-line);
  padding: 3px 8px;
  flex: none;
}

.page-about .section-title {
  font-size: 24px;
  line-height: 1.35;
  letter-spacing: .04em;
  font-weight: 700;
  flex: 1 1 240px;
}

.page-about .section-rule {
  display: block;
  flex: 1 1 80px;
  height: 1px;
  min-width: 40px;
  align-self: center;
  background: linear-gradient(90deg, var(--gold-dim), transparent);
}

/* ---------- 沿革 ---------- */
.page-about .about-history {
  background: var(--c-base);
}

.page-about .about-history-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .aside-title {
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--gold-soft);
  margin: 0 0 16px;
}

.page-about .about-history-aside {
  padding: 24px 22px;
}

.page-about .aside-list {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
}

.page-about .aside-list li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--hairline);
  font-size: 14.5px;
}

.page-about .aside-list li:last-child {
  border-bottom: 0;
}

.page-about .aside-key {
  color: var(--silver-dim);
}

.page-about .aside-val {
  font-family: var(--mono);
  letter-spacing: .06em;
  color: var(--silver);
}

.page-about .aside-note {
  font-size: 14px;
  line-height: 1.75;
  color: var(--silver-dim);
  border-left: 2px solid var(--about-line);
  padding-left: 12px;
}

.page-about .about-history-figure {
  margin: 48px 0 0;
}

.page-about .about-figcaption {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--silver-dim);
}

/* ---------- 板块地图 ---------- */
.page-about .about-map {
  background: linear-gradient(180deg, var(--c-deep), var(--c-base));
}

.page-about .about-map-intro {
  max-width: 68ch;
  margin-bottom: 36px;
}

.page-about .about-map-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .map-canvas {
  position: relative;
  padding: 20px;
  border: 1px solid var(--hairline);
  background:
    linear-gradient(rgba(78, 107, 114, .14) 1px, transparent 1px) 0 0 / 100% 56px,
    linear-gradient(90deg, rgba(78, 107, 114, .14) 1px, transparent 1px) 0 0 / 56px 100%,
    var(--c-deep);
  overflow: hidden;
}

.page-about .map-canvas-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .16;
  pointer-events: none;
}

.page-about .map-grid {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--glass-line);
}

.page-about .map-cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 14px 16px;
  background: var(--c-base);
  transition: background .22s var(--ease), box-shadow .22s var(--ease);
}

.page-about .map-cell:hover,
.page-about .map-cell:focus-visible {
  background: var(--c-panel);
  box-shadow: inset 0 0 0 1px var(--gold);
  outline: none;
}

.page-about .map-code {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--gold);
}

.page-about .map-name {
  font-family: var(--sans);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .03em;
  color: var(--silver);
}

.page-about .map-desc {
  font-family: var(--serif);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--silver-dim);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height .28s var(--ease), opacity .28s var(--ease);
}

.page-about .map-cell:hover .map-desc,
.page-about .map-cell:focus-visible .map-desc,
.page-about .map-cell:focus-within .map-desc {
  max-height: 6em;
  opacity: 1;
}

.page-about .about-map-side {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .map-legend {
  padding: 22px 20px;
}

.page-about .map-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}

.page-about .map-stats .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px;
  background: var(--c-base);
}

.page-about .map-stats .stat-value {
  font-family: var(--sans);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--gold-soft);
}

.page-about .map-stats .stat-label {
  font-size: 13px;
  color: var(--silver-dim);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-timeline-section {
  background: var(--c-base);
}

.page-about .about-timeline-lede {
  max-width: 62ch;
  margin-bottom: 44px;
  color: var(--silver-dim);
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold), var(--gold-dim) 55%, transparent);
}

.page-about .tl-node {
  position: relative;
  padding: 0 0 40px 20px;
}

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

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-base);
  border: 2px solid var(--gold);
  transition: background .22s var(--ease), transform .22s var(--ease);
}

.page-about .tl-node:hover::before {
  background: var(--gold-soft);
  transform: scale(1.25);
}

.page-about .tl-code {
  display: inline-block;
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--gold-soft);
  border: 1px solid var(--about-line);
  padding: 3px 9px;
  margin-bottom: 12px;
}

.page-about .tl-title {
  font-size: 18px;
  line-height: 1.5;
  letter-spacing: .03em;
  margin-bottom: 10px;
}

.page-about .tl-body p {
  margin: 0;
  font-size: 16px;
  color: var(--about-body);
  max-width: 66ch;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: linear-gradient(180deg, var(--c-base), var(--c-deep));
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about .about-bars {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 26px;
}

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

.page-about .bar-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}

.page-about .bar-name {
  font-family: var(--sans);
  font-size: 15.5px;
  font-weight: 700;
  letter-spacing: .03em;
  color: var(--silver);
}

.page-about .bar-value {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--gold-soft);
}

.page-about .bar-track {
  position: relative;
  height: 8px;
  background: var(--c-panel);
  border: 1px solid var(--hairline);
  overflow: hidden;
}

.page-about .bar-fill {
  display: block;
  height: 100%;
  transform-origin: left center;
}

.page-about .bar-fill--1 {
  width: 35.3%;
  background: linear-gradient(90deg, var(--gold), var(--gold-soft));
}

.page-about .bar-fill--2 {
  width: 30.9%;
  background: linear-gradient(90deg, var(--gold-dim), var(--gold));
}

.page-about .bar-fill--3 {
  width: 22.1%;
  background: linear-gradient(90deg, var(--ridge), var(--ridge));
}

.page-about .bar-fill--4 {
  width: 11.8%;
  background: linear-gradient(90deg, var(--silver-dim), var(--ridge));
}

.page-about .bar-desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--silver-dim);
}

@keyframes aboutBarGrow {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

.page-about .about-bars.is-visible .bar-fill--1 { animation: aboutBarGrow .62s var(--ease) both; }
.page-about .about-bars.is-visible .bar-fill--2 { animation: aboutBarGrow .62s var(--ease) .1s both; }
.page-about .about-bars.is-visible .bar-fill--3 { animation: aboutBarGrow .62s var(--ease) .2s both; }
.page-about .about-bars.is-visible .bar-fill--4 { animation: aboutBarGrow .62s var(--ease) .3s both; }

/* ---------- 协作生态 ---------- */
.page-about .about-partners {
  background: var(--c-deep);
}

.page-about .about-partners-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: start;
}

.page-about .about-partners-lede {
  margin-bottom: 28px;
}

.page-about .partner-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .partner-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  align-items: start;
  padding: 18px 18px 18px 0;
  border-left: 2px solid var(--about-line);
  padding-left: 18px;
  transition: border-color .22s var(--ease), background .22s var(--ease);
}

.page-about .partner-item:hover {
  border-left-color: var(--gold-soft);
  background: rgba(232, 237, 245, .04);
}

.page-about .partner-title {
  font-size: 16.5px;
  line-height: 1.5;
  letter-spacing: .03em;
  margin-bottom: 8px;
}

.page-about .partner-item p {
  margin: 0;
  font-size: 15px;
  color: var(--about-body);
}

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

/* ---------- 荣誉 ---------- */
.page-about .about-honor {
  background: var(--c-base);
}

.page-about .honor-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .honor-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 24px 22px;
  background: var(--c-panel);
  border: 1px solid var(--hairline);
  transition: transform .24s var(--ease), box-shadow .24s var(--ease);
}

.page-about .honor-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 0 1px var(--gold-dim);
}

.page-about .honor-card .tag {
  align-self: flex-start;
}

.page-about .honor-card .card-title {
  font-family: var(--sans);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.55;
  letter-spacing: .03em;
  margin: 0;
  color: var(--silver);
}

.page-about .honor-card .card-desc {
  margin: 0;
  font-family: var(--serif);
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver-dim);
}

/* ---------- 三件事 ---------- */
.page-about .about-pledge {
  background: linear-gradient(180deg, var(--c-base), var(--c-deep));
}

.page-about .pledge-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}

.page-about .pledge-item {
  background: var(--c-base);
  padding: 28px 24px;
  border-top: 2px solid transparent;
  transition: border-color .24s var(--ease), background .24s var(--ease);
}

.page-about .pledge-item:hover {
  background: var(--c-panel);
  border-top-color: var(--gold);
}

.page-about .pledge-code {
  display: inline-block;
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--gold-soft);
  margin-bottom: 14px;
}

.page-about .pledge-title {
  font-size: 18px;
  line-height: 1.5;
  letter-spacing: .03em;
  margin-bottom: 12px;
}

.page-about .pledge-item p {
  margin: 0;
  font-size: 15.5px;
  color: var(--about-body);
}

/* ---------- 尾段指引 ---------- */
.page-about .about-next {
  margin-top: 48px;
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  align-items: flex-start;
}

.page-about .about-next-text {
  margin: 0;
  font-size: 16px;
  color: var(--silver);
  max-width: 62ch;
}

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

/* ---------- 焦点可见性 ---------- */
.page-about .map-cell:focus-visible,
.page-about .bar-row:focus-within {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

/* ---------- 平板 ---------- */
@media (min-width: 680px) {
  .page-about .about-hero {
    padding: 56px 0 104px;
  }

  .page-about .about-hero h1 {
    font-size: 42px;
  }

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

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

  .page-about .about-map-side {
    flex-direction: row;
    align-items: stretch;
  }

  .page-about .map-legend {
    flex: 1 1 46%;
  }

  .page-about .map-stats {
    flex: 1 1 54%;
  }

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

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

/* ---------- 桌面 ---------- */
@media (min-width: 1024px) {
  .page-about .section {
    padding: 96px 0;
  }

  .page-about .section--tight {
    padding: 64px 0;
  }

  .page-about .section-title {
    font-size: 28px;
  }

  .page-about .about-hero h1 {
    font-size: 56px;
    line-height: 1.14;
  }

  .page-about .about-hero-split {
    grid-template-columns: 55fr 45fr;
    gap: 72px;
  }

  .page-about .about-history-grid {
    grid-template-columns: 1.5fr .85fr;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-map-layout {
    grid-template-columns: 1.55fr .75fr;
    gap: 40px;
    align-items: start;
  }

  .page-about .about-map-side {
    flex-direction: column;
  }

  .page-about .about-team-grid {
    grid-template-columns: .85fr 1.15fr;
    gap: 64px;
    align-items: start;
  }

  .page-about .about-partners-split {
    grid-template-columns: 1.15fr .85fr;
    gap: 56px;
    align-items: center;
  }

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

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

  .page-about .about-next {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
    padding: 32px 36px;
  }

  .page-about .about-next-actions {
    flex: none;
  }
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-bars.is-visible .bar-fill--1,
  .page-about .about-bars.is-visible .bar-fill--2,
  .page-about .about-bars.is-visible .bar-fill--3,
  .page-about .about-bars.is-visible .bar-fill--4 {
    animation: none;
    transform: none;
  }

  .page-about .map-desc,
  .page-about .map-cell,
  .page-about .tl-node::before,
  .page-about .honor-card,
  .page-about .pledge-item,
  .page-about .partner-item {
    transition: none;
  }

  .page-about .honor-card:hover {
    transform: none;
  }
}