.page-about {
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--ash);
  margin-bottom: clamp(26px, 4vw, 48px);
}

.page-about .about-crumb a {
  color: var(--ash);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--flare);
}

.page-about .about-crumb-sep { color: var(--slate); }
.page-about .about-crumb-now { color: var(--white); }

/* ---------- 首屏 ---------- */
.page-about .about-hero { position: relative; }

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -38%;
  width: min(720px, 78vw);
  height: min(720px, 78vw);
  background: radial-gradient(circle at 50% 50%, rgba(255, 77, 46, .16), transparent 68%);
  pointer-events: none;
  z-index: 0;
}

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

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 58px);
}

@media (min-width: 960px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, .75fr);
    gap: clamp(40px, 6vw, 92px);
    align-items: end;
  }
}

.page-about .about-title {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(2rem, 7vw, 4rem);
  line-height: 1.08;
  letter-spacing: -.015em;
  margin: 14px 0 22px;
  max-width: 560px;
}

.page-about .about-title em {
  font-style: normal;
  color: var(--flare);
  position: relative;
  white-space: nowrap;
}

.page-about .about-title em::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -.08em;
  height: 3px;
  background: var(--flare);
  opacity: .38;
  transform: scaleX(1);
  transform-origin: left;
}

.page-about .about-lead {
  max-width: 620px;
  font-size: clamp(.95rem, 1.5vw, 1.0625rem);
  line-height: 1.85;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-hero-aside {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  border-left: 1px solid var(--line-strong);
  padding: 4px 0 4px 20px;
}

.page-about .about-aside-body { min-width: 0; }

.page-about .about-aside-line {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--white);
}

/* ---------- 通栏图 ---------- */
.page-about .about-banner-figure {
  margin: 0;
  position: relative;
  aspect-ratio: 1024 / 640;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  background: var(--ink-deep);
}

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

.page-about .about-banner-figure .figure-cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 34px clamp(16px, 3vw, 30px) 16px;
  background: linear-gradient(to top, rgba(8, 19, 31, .94), rgba(8, 19, 31, 0));
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--ash);
}

/* ---------- 区块标题 ---------- */
.page-about .about-head { margin-bottom: clamp(30px, 5vw, 52px); }

.page-about .about-head h2 {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.6vw, 2.35rem);
  line-height: 1.22;
  letter-spacing: -.01em;
  margin: 10px 0 0;
}

.page-about .about-head-note {
  max-width: 480px;
  font-size: 14px;
  line-height: 1.8;
}

/* ---------- 历程 + 数据 ---------- */
.page-about .about-origin-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(34px, 5vw, 62px);
}

@media (min-width: 940px) {
  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
    align-items: start;
    gap: clamp(40px, 5vw, 74px);
  }
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  border-left: 1px solid var(--line-strong);
}

.page-about .about-tl-item {
  position: relative;
  padding-bottom: clamp(26px, 3.6vw, 38px);
}

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

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 5px;
  width: 11px;
  height: 11px;
  margin-left: -5.5px;
  border-radius: 50%;
  background: var(--ink-deep);
  border: 1px solid var(--flare);
  transition: background 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .about-tl-item:hover::before,
.page-about .about-tl-item:focus-within::before {
  background: var(--flare);
  box-shadow: 0 0 0 5px rgba(255, 77, 46, .16);
}

.page-about .about-tl-year {
  margin: 0 0 7px;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--pulse);
  text-transform: uppercase;
}

.page-about .about-tl-title {
  font-family: var(--font-title);
  font-size: clamp(1.05rem, 2.2vw, 1.32rem);
  font-weight: 800;
  line-height: 1.4;
  margin: 0 0 8px;
  color: var(--white);
}

.page-about .about-tl-text {
  margin: 0;
  max-width: 46ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ash);
}

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

.page-about .stat-cell {
  background: var(--ink-deep);
  padding: clamp(16px, 2.6vw, 26px) clamp(14px, 2.2vw, 22px);
  display: flex;
  flex-direction: column;
  gap: 9px;
  transition: background 200ms var(--ease);
}

.page-about .stat-cell:hover { background: var(--panel); }

.page-about .stat-figure {
  display: flex;
  align-items: baseline;
  gap: 3px;
}

.page-about .stat-num {
  font-family: var(--font-data);
  font-size: clamp(1.5rem, 3.4vw, 2.05rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--white);
  font-variant-numeric: tabular-nums;
}

.page-about .stat-unit {
  font-family: var(--font-title);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--flare);
}

.page-about .stat-label {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ash);
}

/* ---------- 数据流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 28px);
}

.page-about .about-flow-step {
  position: relative;
  padding: 0 0 0 26px;
  border-left: 1px solid var(--line-strong);
}

.page-about .about-flow-step::before {
  content: "";
  position: absolute;
  left: -5.5px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--pulse);
}

.page-about .about-flow-num {
  display: block;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--amber);
  margin-bottom: 10px;
}

.page-about .about-flow-title {
  font-family: var(--font-title);
  font-size: clamp(1rem, 2vw, 1.2rem);
  font-weight: 800;
  line-height: 1.4;
  margin: 0 0 8px;
  color: var(--white);
}

.page-about .about-flow-text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ash);
}

@media (min-width: 900px) {
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    border-top: 1px solid var(--line-strong);
    padding-top: 30px;
  }

  .page-about .about-flow-step {
    padding: 0 clamp(16px, 2vw, 26px);
    border-left: 1px solid var(--line);
    border-top: 0;
  }

  .page-about .about-flow-step:first-child {
    padding-left: 0;
    border-left: 0;
  }

  .page-about .about-flow-step:last-child { padding-right: 0; }

  .page-about .about-flow-step::before {
    left: clamp(16px, 2vw, 26px);
    top: -35px;
  }

  .page-about .about-flow-step:first-child::before { left: 0; }
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-coverage-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 56px);
}

@media (min-width: 960px) {
  .page-about .about-coverage-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    align-items: start;
  }
}

.page-about .about-map-figure {
  margin: 0;
  border: 1px solid var(--line-strong);
  background: linear-gradient(158deg, var(--ink-deep) 0%, var(--panel) 100%);
  padding: clamp(18px, 3vw, 34px);
}

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

.page-about .about-map-outline {
  fill: rgba(14, 27, 44, .78);
  stroke: var(--line-strong);
  stroke-width: 1.5;
  stroke-linejoin: round;
}

.page-about .about-map-links line {
  stroke: rgba(43, 227, 192, .42);
  stroke-width: 1;
}

.page-about .about-map-node {
  fill: rgba(138, 148, 166, .85);
  transition: fill 200ms var(--ease), r 200ms var(--ease);
}

.page-about .about-map-node--hot { fill: var(--flare); }

.page-about .about-map-figure:hover .about-map-node { fill: var(--pulse); }
.page-about .about-map-figure:hover .about-map-node--hot { fill: var(--flare); }

.page-about .about-map-figure .figure-cap {
  margin: 22px 0 0;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--ash);
}

.page-about .about-coverage-index {
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-league-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .about-league-list li {
  position: relative;
  padding-left: 15px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ash);
}

.page-about .about-league-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 7px;
  height: 1px;
  background: var(--pulse);
}

/* ---------- 安装引导与索引维护 ---------- */
.page-about .about-guide-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 26px);
}

@media (min-width: 860px) {
  .page-about .about-guide-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-guide-card {
  padding: clamp(22px, 3.4vw, 36px);
}

.page-about .about-guide-card h3 {
  font-family: var(--font-title);
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  font-weight: 800;
  line-height: 1.35;
  margin: 0 0 12px;
  color: var(--white);
}

.page-about .about-guide-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ash);
}

.page-about .about-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.page-about .about-list li {
  position: relative;
  padding-left: 16px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ash);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 8px;
  height: 1px;
  background: var(--flare);
}

.page-about .about-inline-link {
  display: inline-block;
  margin-top: 24px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--pulse);
  text-decoration: none;
  padding-bottom: 3px;
  background-image: linear-gradient(currentColor, currentColor);
  background-repeat: no-repeat;
  background-size: 0% 1px;
  background-position: left bottom;
  transition: background-size 180ms var(--ease), color 180ms var(--ease);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  background-size: 100% 1px;
  color: var(--white);
}

/* ---------- 服务团队 ---------- */
.page-about .about-support { color: var(--ink); }

.page-about .about-support h2 {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.6vw, 2.35rem);
  line-height: 1.22;
  letter-spacing: -.01em;
  margin: 10px 0 18px;
  color: var(--ink);
}

.page-about .about-support .eyebrow { color: rgba(14, 27, 44, .58); }

.page-about .about-support-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 60px);
}

@media (min-width: 900px) {
  .page-about .about-support-grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    align-items: center;
  }
}

.page-about .about-support-text {
  margin: 0;
  max-width: 52ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(14, 27, 44, .74);
}

.page-about .about-contact-list {
  margin: 28px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-paper);
}

.page-about .about-contact-list > div {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 18px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-paper);
}

.page-about .about-contact-list dt {
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(14, 27, 44, .55);
}

.page-about .about-contact-list dd {
  margin: 0;
  font-family: var(--font-data);
  font-size: 14px;
  color: var(--ink);
  word-break: break-word;
}

.page-about .about-support-btn { margin-top: 28px; }

.page-about .about-support-figure {
  margin: 0;
  border: 1px solid var(--line-paper);
  overflow: hidden;
  background: var(--ink-deep);
}

.page-about .about-support-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 800 / 600;
}

.page-about .about-support-figure .figure-cap {
  margin: 0;
  padding: 14px 16px 16px;
  background: var(--ink-deep);
  font-size: 12px;
  line-height: 1.7;
  color: var(--ash);
}

/* ---------- 版本演进 ---------- */
.page-about .about-version-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 820px) {
  .page-about .about-version-band {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-version-card {
  background: var(--ink-deep);
  padding: clamp(22px, 3vw, 34px);
  transition: background 200ms var(--ease);
}

.page-about .about-version-card:hover { background: var(--panel); }

.page-about .about-version-tag {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 10.5px;
  letter-spacing: .12em;
  color: var(--amber);
  border: 1px solid rgba(255, 176, 32, .34);
  padding: 4px 9px;
  margin-bottom: 18px;
}

.page-about .about-version-card h3 {
  font-family: var(--font-title);
  font-size: clamp(1.05rem, 2.2vw, 1.28rem);
  font-weight: 800;
  line-height: 1.4;
  margin: 0 0 10px;
  color: var(--white);
}

.page-about .about-version-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ash);
}

/* ---------- 尾部入口 ---------- */
.page-about .about-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 760px) {
  .page-about .about-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-band a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: clamp(16px, 2.4vw, 22px) clamp(14px, 2vw, 20px);
  background: var(--ink-deep);
  color: var(--white);
  text-decoration: none;
  font-size: 13.5px;
  font-weight: 600;
  transition: background 180ms var(--ease), color 180ms var(--ease), padding-left 180ms var(--ease);
}

.page-about .about-band a .num {
  color: var(--ash);
  font-size: 11px;
  transition: color 180ms var(--ease);
}

.page-about .about-band a:hover,
.page-about .about-band a:focus-visible {
  background: var(--flare);
  padding-left: 26px;
}

.page-about .about-band a:hover .num,
.page-about .about-band a:focus-visible .num { color: rgba(245, 247, 250, .78); }

.page-about .about-tail {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  margin-top: clamp(26px, 4vw, 42px);
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.page-about .about-tail .muted { margin: 0; }

/* ---------- 窄屏收敛 ---------- */
@media (max-width: 620px) {
  .page-about .stat-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-hero-aside {
    border-left: 0;
    border-top: 1px solid var(--line-strong);
    padding: 18px 0 0;
  }

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

  .page-about .about-contact-list > div {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (hover: none) {
  .page-about .about-tl-item::before { background: var(--panel); }
}