.page-about {
  --about-rail: 34px;
  --about-chapter-gap: 76px;
  color: var(--mist);
  padding-bottom: 48px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 26px 0 0;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--neutral-gray);
}

.page-about .breadcrumb li {
  display: inline-flex;
  align-items: center;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--line-strong);
}

.page-about .breadcrumb a {
  color: var(--steel-blue);
  text-decoration: none;
  transition: color 0.25s var(--ease);
}

.page-about .breadcrumb a:hover {
  color: var(--mist);
}

/* ---------- 首屏 ---------- */
.page-about .about-intro {
  padding: 44px 0 4px;
}

.page-about .about-intro__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.05rem, 7.4vw, 4.4rem);
  line-height: 1.06;
  letter-spacing: -0.012em;
  margin: 14px 0 0;
  max-width: 17ch;
}

.page-about .about-intro__lede {
  margin: 24px 0 0;
  max-width: 60ch;
  font-size: 1.02rem;
  line-height: 1.86;
  color: var(--neutral-gray);
}

/* ---------- 纵向时间轴骨架 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 68px 0 0;
  padding-left: var(--about-rail);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 14px;
  bottom: 30px;
  width: 1px;
  background: linear-gradient(
    180deg,
    transparent 0%,
    var(--line-strong) 5%,
    var(--line-strong) 95%,
    transparent 100%
  );
}

.page-about .about-chapter {
  position: relative;
  margin: 0 0 var(--about-chapter-gap);
}

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

.page-about .about-chapter::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--about-rail) + 5px);
  top: 15px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--data-amber);
  box-shadow: 0 0 0 5px var(--deep-pitch), 0 0 0 6px rgba(245, 165, 36, 0.32);
}

.page-about .about-chapter__head {
  max-width: 68ch;
}

.page-about .about-chapter__head .label {
  color: var(--data-amber);
  margin: 0;
}

.page-about .about-chapter__head h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.62rem, 4.8vw, 2.7rem);
  line-height: 1.16;
  letter-spacing: -0.006em;
  margin: 12px 0 0;
}

.page-about .about-chapter__lede {
  margin: 16px 0 0;
  max-width: 58ch;
  font-size: 1rem;
  line-height: 1.86;
  color: var(--neutral-gray);
}

/* ---------- 图片容器 ---------- */
.page-about .about-media {
  margin: 38px 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--night-stand);
  border: 1px solid var(--line-soft);
}

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

.page-about .about-media--daily img {
  aspect-ratio: 16 / 10;
}

.page-about .about-media--board {
  max-width: 620px;
}

.page-about .about-media--board img {
  aspect-ratio: 1 / 1;
}

.page-about .about-media--trail img {
  aspect-ratio: 16 / 7;
}

/* ---------- 01 班次 ---------- */
.page-about .about-shift {
  margin: 32px 0 0;
  display: grid;
  gap: 14px;
}

.page-about .about-shift__item {
  padding: 22px 22px 26px;
  border-radius: var(--radius-md);
  background: linear-gradient(158deg, var(--panel-deep) 0%, var(--deep-pitch) 100%);
  border: 1px solid var(--line-soft);
}

.page-about .about-shift__item .label {
  color: var(--data-amber);
  margin: 0;
}

.page-about .about-shift__item h3 {
  margin: 10px 0 9px;
  font-size: 1.04rem;
  font-weight: 600;
  line-height: 1.45;
}

.page-about .about-shift__item p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--neutral-gray);
}

/* ---------- 02 整理链路 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-flow__step {
  position: relative;
  padding: 20px 18px 24px;
  border-radius: var(--radius-md);
  background: var(--panel-deep);
  border: 1px solid var(--line-soft);
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease),
    transform 0.3s var(--ease);
}

.page-about .about-flow__step:hover,
.page-about .about-flow__step:focus-within {
  border-color: rgba(245, 165, 36, 0.55);
  background: var(--panel-lift);
  transform: translateY(-3px);
}

.page-about .about-flow__idx {
  display: block;
  font-family: var(--font-numeric);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--data-amber);
}

.page-about .about-flow__step h3 {
  margin: 10px 0 8px;
  font-size: 1.04rem;
  font-weight: 600;
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.76;
  color: var(--neutral-gray);
}

/* ---------- 03 发展脉络 ---------- */
.page-about .about-history {
  list-style: none;
  position: relative;
  margin: 34px 0 0;
  padding: 0 0 0 28px;
}

.page-about .about-history::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 10px;
  width: 1px;
  background: var(--line);
}

.page-about .about-history__item {
  position: relative;
  padding: 0 0 34px;
}

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

.page-about .about-history__node {
  position: absolute;
  left: -28px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--data-amber);
  box-shadow: 0 0 0 4px var(--deep-pitch), 0 0 0 5px rgba(245, 165, 36, 0.3);
  transition: transform 0.32s var(--ease), background 0.32s var(--ease);
}

.page-about .about-history__item:hover .about-history__node,
.page-about .about-history__item:focus-within .about-history__node {
  transform: scale(1.4);
  background: var(--signal-orange);
}

.page-about .about-history__item .label {
  color: var(--steel-blue);
  margin: 0;
}

.page-about .about-history__item h3 {
  margin: 8px 0 9px;
  font-size: 1.14rem;
  font-weight: 600;
  line-height: 1.4;
}

.page-about .about-history__item p {
  margin: 0;
  max-width: 62ch;
  font-size: 0.95rem;
  line-height: 1.82;
  color: var(--neutral-gray);
}

/* ---------- 04 规模 ---------- */
.page-about .about-scale {
  margin: 32px 0 0;
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--line);
}

.page-about .about-scale__cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-scale__num {
  font-family: var(--font-numeric);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.9rem, 6vw, 2.9rem);
  line-height: 1;
  color: var(--data-amber);
  letter-spacing: -0.02em;
}

.page-about .about-scale__cap {
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--neutral-gray);
}

/* ---------- 04 标签页 ---------- */
.page-about .about-tabs {
  margin: 38px 0 0;
}

.page-about .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 18px;
}

.page-about .tab {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--steel-blue);
  border-radius: var(--radius-pill);
  padding: 8px 18px;
  font-family: var(--font-body);
  font-size: 0.82rem;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease),
    background 0.25s var(--ease);
}

.page-about .tab:hover {
  color: var(--mist);
  border-color: var(--line-strong);
}

.page-about .tab.is-active {
  background: var(--signal-orange);
  border-color: var(--signal-orange);
  color: #25100A;
  font-weight: 600;
}

.page-about .tab:focus-visible {
  outline: 2px solid var(--data-amber);
  outline-offset: 2px;
}

.page-about .tabpanel[hidden] {
  display: none;
}

/* ---------- 轻量表格 ---------- */
.page-about .table-lite {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.page-about thead.table-lite__head th {
  text-align: left;
  font-family: var(--font-body);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--steel-blue);
  padding: 0 14px 12px 0;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

.page-about .table-lite td {
  padding: 14px 14px 14px 0;
  border-bottom: 1px solid var(--line-soft);
  color: var(--mist);
  vertical-align: top;
  line-height: 1.65;
}

.page-about .table-lite td.num {
  font-family: var(--font-numeric);
  font-variant-numeric: tabular-nums;
  color: var(--data-amber);
  white-space: nowrap;
}

/* ---------- 05 三道关 ---------- */
.page-about .about-gates {
  margin: 32px 0 0;
  display: grid;
  gap: 14px;
}

.page-about .about-gate {
  padding: 26px 24px 28px;
}

.page-about .about-gate .label {
  color: var(--data-amber);
  margin: 0;
}

.page-about .about-gate h3 {
  margin: 12px 0 10px;
  font-size: 1.08rem;
  font-weight: 600;
}

.page-about .about-gate p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--neutral-gray);
}

/* ---------- 05 问答 ---------- */
.page-about .about-acc {
  margin: 30px 0 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-acc .acc__item {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-acc .acc__btn {
  width: 100%;
  display: block;
  text-align: left;
  background: transparent;
  border: 0;
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 0.98rem;
  font-weight: 500;
  line-height: 1.6;
  padding: 20px 34px 20px 0;
  position: relative;
  cursor: pointer;
  transition: color 0.25s var(--ease);
}

.page-about .about-acc .acc__btn::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 18px;
  font-family: var(--font-numeric);
  font-size: 1.15rem;
  color: var(--data-amber);
  transition: transform 0.3s var(--ease);
}

.page-about .about-acc .acc__btn[aria-expanded="true"]::after {
  transform: rotate(45deg);
}

.page-about .about-acc .acc__btn:hover {
  color: var(--live-lime);
}

.page-about .about-acc .acc__btn:focus-visible {
  outline: 2px solid var(--data-amber);
  outline-offset: 2px;
}

.page-about .about-acc .acc__panel-inner {
  padding: 0 0 22px;
  max-width: 68ch;
}

.page-about .about-acc .acc__panel-inner p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.82;
  color: var(--neutral-gray);
}

/* ---------- 06 团队 ---------- */
.page-about .about-team {
  margin: 32px 0 0;
  display: grid;
  gap: 16px;
}

.page-about .about-team__card {
  padding: 30px 26px 32px;
  border-radius: var(--radius-lg);
  background: linear-gradient(155deg, var(--panel-deep) 0%, var(--night-stand) 100%);
  border: 1px solid var(--line-soft);
}

.page-about .about-team__num {
  display: block;
  font-family: var(--font-numeric);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2.4rem, 7vw, 3.4rem);
  line-height: 1;
  color: var(--signal-orange);
  letter-spacing: -0.03em;
}

.page-about .about-team__card h3 {
  margin: 16px 0 10px;
  font-size: 1.08rem;
  font-weight: 600;
}

.page-about .about-team__card p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--neutral-gray);
}

.page-about .about-team__foot {
  margin: 24px 0 0;
  max-width: 70ch;
  font-size: 0.9rem;
  line-height: 1.82;
  color: var(--steel-blue);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin: 78px 0 0;
  padding: 38px 26px 40px;
  display: grid;
  gap: 26px;
}

.page-about .about-cta .label {
  color: var(--data-amber);
  margin: 0;
}

.page-about .about-cta h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 4.6vw, 2.25rem);
  line-height: 1.2;
}

.page-about .about-cta p {
  margin: 14px 0 0;
  max-width: 58ch;
  font-size: 0.95rem;
  line-height: 1.82;
  color: var(--neutral-gray);
}

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

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-scale {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-scale__cell {
    padding: 26px 24px;
    border-left: 1px solid var(--line-soft);
  }

  .page-about .about-scale__cell:nth-child(odd) {
    border-left: 0;
    padding-left: 0;
  }

  .page-about .about-scale__cell:nth-last-child(-n + 2) {
    border-bottom: 0;
  }
}

@media (min-width: 768px) {
  .page-about {
    --about-chapter-gap: 92px;
  }

  .page-about .about-shift {
    gap: 18px;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

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

  .page-about .about-cta {
    padding: 44px 40px 46px;
  }
}

@media (min-width: 900px) {
  .page-about .about-shift {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 1024px) {
  .page-about {
    --about-rail: 46px;
    --about-chapter-gap: 112px;
  }

  .page-about .about-timeline::before {
    left: 13px;
  }

  .page-about .about-chapter::before {
    left: calc(-1 * var(--about-rail) + 8px);
    top: 16px;
  }

  .page-about .about-intro {
    padding: 56px 0 4px;
  }

  .page-about .about-intro__lede {
    font-size: 1.06rem;
  }

  .page-about .about-chapter--split {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    column-gap: 52px;
    align-items: start;
  }

  .page-about .about-chapter--split .about-chapter__head {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-chapter--split .about-shift {
    grid-column: 1;
    grid-row: 2;
  }

  .page-about .about-chapter--split .about-shift {
    grid-template-columns: 1fr;
  }

  .page-about .about-chapter--split .about-media {
    grid-column: 2;
    grid-row: 1 / span 2;
    align-self: start;
    margin-top: 6px;
  }

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

  .page-about .about-scale__cell {
    padding: 30px 26px;
    border-bottom: 0;
    border-left: 1px solid var(--line-soft);
  }

  .page-about .about-scale__cell:nth-child(odd) {
    padding-left: 26px;
    border-left: 1px solid var(--line-soft);
  }

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

  .page-about .about-scale__cell:last-child {
    border-right: 0;
    padding-right: 0;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, auto);
    align-items: center;
    gap: 44px;
    padding: 50px 54px 52px;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1200px) {
  .page-about .about-flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-flow__step::after {
    content: "";
    position: absolute;
    top: 34px;
    right: -14px;
    width: 14px;
    height: 1px;
    background: var(--line);
  }

  .page-about .about-flow__step:last-child::after {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-flow__step,
  .page-about .about-history__node,
  .page-about .about-acc .acc__btn::after,
  .page-about .tab {
    transition: none;
  }

  .page-about .about-flow__step:hover,
  .page-about .about-flow__step:focus-within {
    transform: none;
  }

  .page-about .about-history__item:hover .about-history__node,
  .page-about .about-history__item:focus-within .about-history__node {
    transform: none;
  }
}