/* ================= 品牌总览页面 ================= */
.page-about {
  --about-rail: 250px;
  --about-cut: 20px;
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(26px, 5vw, 52px);
  padding-bottom: clamp(28px, 4vw, 46px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: var(--gutter);
  bottom: -1px;
  width: 92px;
  height: 2px;
  background: var(--green);
}

.page-about .crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--muted);
}

.page-about .crumbs__link {
  color: var(--muted);
  text-decoration: none;
  transition: color .2s var(--ease);
}

.page-about .crumbs__link:hover {
  color: var(--blue);
}

.page-about .crumbs__item--current {
  color: var(--paper);
}

.page-about .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--green);
}

.page-about .eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
  opacity: .85;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  max-width: 20ch;
  font-family: var(--font-display);
  font-size: clamp(30px, 6.4vw, 62px);
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 66ch;
  font-size: clamp(15px, 1.8vw, 17px);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .about-hero__stats .stat-block {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 16px 14px;
  border: 1px solid var(--line);
  background: var(--ink-panel);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
}

.page-about .about-hero__stats .stat-block__value {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 4vw, 36px);
  line-height: 1;
  color: var(--green);
}

.page-about .about-hero__stats .stat-block__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 章节跟随布局 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding-top: 26px;
  padding-bottom: 64px;
  align-items: start;
}

.page-about .toc-rail {
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--ink-panel);
}

.page-about .toc-rail__label {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .toc-rail__list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .toc-rail__link {
  display: block;
  white-space: nowrap;
  padding: 7px 12px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  transition: color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}

.page-about .toc-rail__link:hover,
.page-about .toc-rail__link[aria-current="true"] {
  color: var(--paper);
  background: rgba(56, 240, 140, .08);
  border-color: rgba(56, 240, 140, .38);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: 40px 0 0;
  border-top: 1px solid var(--line);
  margin-top: 32px;
  scroll-margin-top: calc(var(--offset) + 20px);
}

.page-about .about-section:first-child {
  margin-top: 0;
  padding-top: 6px;
  border-top: 0;
}

.page-about .about-section__head {
  margin-bottom: 18px;
}

.page-about .about-section__head .t-title {
  margin: 10px 0 0;
  max-width: 26ch;
  font-family: var(--font-display);
  font-size: clamp(23px, 3.4vw, 38px);
  line-height: 1.16;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-lede {
  margin: 0 0 22px;
  padding-left: 18px;
  border-left: 2px solid var(--green);
  font-family: var(--font-editorial);
  font-size: clamp(17px, 2.1vw, 22px);
  line-height: 1.66;
  color: var(--paper);
}

.page-about .about-prose p {
  margin: 0 0 1.05em;
  font-size: 16px;
  line-height: 1.82;
  color: var(--paper);
}

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

.page-about .about-prose--tail {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px dashed var(--line);
}

.page-about .about-prose--tail p {
  color: var(--muted);
}

/* ---------- 节点轴 ---------- */
.page-about .node-axis {
  position: relative;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .node-axis::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--green) 0%, var(--blue) 42%, var(--line) 100%);
}

.page-about .node-axis__item {
  position: relative;
  padding: 0 0 26px 32px;
}

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

.page-about .node-axis__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--green);
  box-shadow: 0 0 0 4px rgba(56, 240, 140, .1);
  transition: box-shadow .3s var(--ease), transform .3s var(--ease);
}

.page-about .node-axis__item:hover::before {
  transform: scale(1.14);
  box-shadow: 0 0 0 7px rgba(56, 240, 140, .18);
}

.page-about .node-axis__year {
  display: block;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 18px;
  letter-spacing: .04em;
  color: var(--green);
}

.page-about .node-axis__title {
  margin: 6px 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .node-axis__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--paper);
}

.page-about .node-axis__more {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
  transition: color .28s var(--ease);
}

.page-about .node-axis__item:hover .node-axis__more {
  color: var(--paper);
}

.page-about .about-milestone-figure {
  margin: 28px 0 0;
}

/* ---------- 四步流程 ---------- */
.page-about .flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow__step {
  position: relative;
  padding: 22px 18px 18px;
  background: var(--ink-panel);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
  transition: background .28s var(--ease), border-color .28s var(--ease);
}

.page-about .flow__step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 52px;
  height: 2px;
  background: repeating-linear-gradient(90deg, var(--green) 0 7px, transparent 7px 14px);
}

.page-about .flow__step:hover {
  background: #101c2b;
  border-color: rgba(56, 240, 140, .35);
}

.page-about .flow__num {
  display: block;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  line-height: 1;
  color: var(--blue);
}

.page-about .flow__title {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  color: var(--paper);
}

.page-about .flow__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--muted);
}

.page-about .flow__meta {
  margin: 12px 0 0;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  font-size: 12.5px;
  letter-spacing: .02em;
  color: var(--green);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  align-items: center;
}

.page-about .team-donut {
  position: relative;
  width: min(220px, 70vw);
  aspect-ratio: 1 / 1;
  margin: 0 auto;
}

.page-about .team-donut__ring {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: conic-gradient(
    from -90deg,
    var(--green) 0 35.3%,
    var(--blue) 35.3% 55.9%,
    var(--amber) 55.9% 86.8%,
    var(--muted) 86.8% 100%
  );
  position: relative;
}

.page-about .team-donut__ring::after {
  content: "";
  position: absolute;
  inset: 26px;
  border-radius: 50%;
  background: var(--ink);
}

.page-about .team-donut__core {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  text-align: center;
}

.page-about .team-donut__num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 42px;
  line-height: 1;
  color: var(--paper);
}

.page-about .team-donut__cap {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
}

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

.page-about .team-legend__item {
  display: grid;
  grid-template-columns: 10px 42px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 12px 14px;
  border: 1px solid var(--line);
  background: var(--ink-panel);
  border-radius: 12px;
}

.page-about .team-legend__dot {
  width: 10px;
  height: 10px;
  margin-top: 6px;
  border-radius: 50%;
  background: var(--dot, var(--green));
  box-shadow: 0 0 10px -1px var(--dot, var(--green));
}

.page-about .team-legend__num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 22px;
  line-height: 1.25;
  color: var(--paper);
}

.page-about .team-legend__body {
  display: block;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .team-legend__body strong {
  display: block;
  margin-bottom: 3px;
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-team-figure {
  margin: 26px 0 0;
}

/* ---------- 内容栏目 ---------- */
.page-about .track-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .track-card {
  position: relative;
  padding: 22px 18px 20px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--blue);
  background: var(--ink-panel);
  transition: border-left-color .28s var(--ease), background .28s var(--ease);
}

.page-about .track-card:nth-child(1) { border-left-color: var(--green); }
.page-about .track-card:nth-child(2) { border-left-color: var(--blue); }
.page-about .track-card:nth-child(3) { border-left-color: var(--amber); }

.page-about .track-card:hover {
  background: #101c2b;
}

.page-about .track-card__tag {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: 11.5px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .track-card__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .track-card__text {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--muted);
}

.page-about .track-card__link {
  display: inline-block;
  font-size: 14px;
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 183, 255, .4);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .track-card__link:hover {
  color: var(--paper);
  border-color: var(--paper);
}

/* ---------- 资质 ---------- */
.page-about .cred-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .cred-item {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .cred-item__key {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 30px;
  line-height: 1;
  color: var(--green);
}

.page-about .cred-item__unit {
  font-size: 15px;
  margin-left: 2px;
}

.page-about .cred-item__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .cred-item__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--muted);
}

/* ---------- 合作 ---------- */
.page-about .partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 22px;
}

.page-about .partner-card {
  padding: 24px 20px 20px;
  background: var(--green-deep);
  border: 1px solid rgba(56, 240, 140, .28);
  border-radius: 14px;
}

.page-about .partner-card__num {
  margin: 0;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 46px;
  line-height: 1;
  color: var(--green);
}

.page-about .partner-card__plus {
  font-size: 26px;
  margin-left: 2px;
}

.page-about .partner-card__title {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .partner-card__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--muted);
}

/* ---------- 服务范围 ---------- */
.page-about .coverage-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  align-items: start;
}

.page-about .coverage-grid__lead {
  margin: 0 0 20px;
  font-size: 16px;
  line-height: 1.82;
  color: var(--paper);
}

.page-about .coverage-list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .coverage-list__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .coverage-list__key {
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--blue);
}

.page-about .coverage-list__val {
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .coverage-grid__actions {
  margin-top: 24px;
}

.page-about .coverage-grid__figure {
  margin: 0;
}

/* ---------- 中屏 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

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

  .page-about .partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .coverage-list__item {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }

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

/* ---------- 桌面 ---------- */
@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 52px;
  }

  .page-about .toc-rail {
    position: sticky;
    top: calc(var(--offset) + 14px);
    padding: 18px 16px;
  }

  .page-about .toc-rail__list {
    display: block;
    overflow: visible;
    padding: 0;
  }

  .page-about .toc-rail__link {
    padding: 9px 12px;
    border-radius: 10px;
    border-left: 2px solid transparent;
    font-size: 13.5px;
  }

  .page-about .node-axis__item {
    display: grid;
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 20px;
    padding-left: 34px;
  }

  .page-about .node-axis__year {
    padding-top: 2px;
    font-size: 20px;
  }

  .page-about .node-axis__title {
    margin-top: 0;
  }

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

  .page-about .team-grid {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 34px;
  }

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

  .page-about .coverage-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 460px);
    gap: 40px;
  }

  .page-about .cred-item {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 24px;
    padding: 22px 0;
  }

  .page-about .cred-item__key {
    font-size: 36px;
  }
}

/* ---------- 窄屏收口 ---------- */
@media (max-width: 420px) {
  .page-about .cred-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
  }

  .page-about .team-legend__item {
    grid-template-columns: 10px 36px minmax(0, 1fr);
    gap: 10px;
  }

  .page-about .about-hero__stats .stat-block {
    padding: 14px 13px 12px;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .node-axis__item::before,
  .page-about .node-axis__more,
  .page-about .flow__step,
  .page-about .track-card {
    transition: none;
  }
}

.page-about {
  --dot: none;
}