.page-about .about-crumb {
  padding-top: 22px;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -12%;
  width: 560px;
  height: 560px;
  background:
    radial-gradient(circle at 72% 32%, rgba(182, 255, 60, 0.15), transparent 62%),
    radial-gradient(circle at 22% 78%, rgba(255, 106, 26, 0.13), transparent 60%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding: 26px 0 24px;
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(30px, 6.2vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-hero__text {
  margin: 16px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.68;
  color: var(--silver);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-hero__fact {
  background: var(--charcoal);
  padding: 14px 12px 16px;
  min-width: 0;
}

.page-about .about-hero__fact dt {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-hero__fact dd {
  margin: 8px 0 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
  color: var(--paper);
  min-width: 0;
}

.page-about .about-hero__fact .num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 5.4vw, 34px);
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__fact em {
  font-style: normal;
  font-size: 12px;
  color: var(--silver);
  white-space: nowrap;
}

.page-about .about-hero__media {
  margin: 22px 0 0;
}

/* ============ 两栏骨架 ============ */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  padding-top: 40px;
  padding-bottom: 40px;
}

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

.page-about .about-toc__list {
  display: flex;
  gap: 6px;
  margin: 10px 0 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-toc__item {
  flex: 0 0 auto;
}

.page-about .about-toc__link {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 8px 12px;
  font-size: 13px;
  line-height: 1.2;
  white-space: nowrap;
  text-decoration: none;
  color: var(--silver);
  border: 1px solid var(--line);
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--paper);
  border-color: var(--line-strong);
}

.page-about .about-toc__num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .about-toc__link[aria-current] {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .about-toc__link[aria-current] .about-toc__num {
  color: rgba(14, 27, 61, 0.62);
}

/* ============ 通用章节 ============ */
.page-about .about-sec {
  padding-bottom: 46px;
}

.page-about .about-sec + .about-sec {
  padding-top: 42px;
  border-top: 1px solid var(--line);
}

.page-about .about-sec__head {
  max-width: 720px;
  margin-bottom: 24px;
}

.page-about .about-sec__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(23px, 3.8vw, 36px);
  line-height: 1.16;
  letter-spacing: -0.008em;
  color: var(--paper);
}

.page-about .about-sec__note {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--muted);
}

/* ============ 时间折线 ============ */
.page-about .about-axis {
  margin: 0 0 4px;
}

.page-about .about-axis svg {
  display: block;
  width: 100%;
  height: 78px;
}

/* ============ 版本节点 ============ */
.page-about .about-eras {
  border-top: 1px solid var(--line);
}

.page-about .about-era {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-bottom: 1px solid var(--line);
  transition: background var(--t-fast);
}

.page-about .about-era:hover {
  background: rgba(27, 42, 85, 0.42);
}

.page-about .about-era__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 12px 16px 0;
  cursor: pointer;
  list-style: none;
  color: var(--paper);
}

.page-about .about-era__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-era__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange);
  flex: 0 0 auto;
}

.page-about .about-era__mark {
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--paper);
  min-width: 0;
}

.page-about .about-era__chev {
  margin-left: auto;
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-right: 1px solid var(--muted);
  border-bottom: 1px solid var(--muted);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform var(--t-fast);
}

.page-about .about-era[open] .about-era__chev {
  transform: rotate(-135deg) translate(-2px, -2px);
}

.page-about .about-era[open] .about-era__mark {
  color: var(--lime);
}

.page-about .about-era__body {
  padding: 0 12px 20px 0;
}

.page-about .about-era__title {
  margin: 0;
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-era__text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--silver);
}

/* ============ 数据上线流程 ============ */
.page-about .about-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 4px 14px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
  transition: background var(--t-fast);
}

.page-about .about-step:hover {
  background: rgba(21, 24, 31, 0.85);
}

.page-about .about-step__idx {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: clamp(20px, 4vw, 28px);
  line-height: 1;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-step__title {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--paper);
  letter-spacing: 0.02em;
}

.page-about .about-step__text {
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.68;
  color: var(--silver);
}

.page-about .about-step__time {
  grid-column: 2;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .about-pipeline__media {
  margin: 24px 0 0;
}

.page-about .about-pipeline__media .media__cap {
  margin-top: 10px;
  font-size: 12px;
  color: var(--muted);
}

/* ============ 奶油纸档案带 ============ */
.page-about .about-sec--paper {
  margin: 8px 0 6px;
  padding: 0;
  border-top: 0;
}

.page-about .about-paper {
  background: var(--cream);
  color: var(--brown);
  padding: 28px 20px 30px;
  border: 1px solid rgba(42, 33, 24, 0.16);
  box-shadow: 0 0 0 1px rgba(14, 27, 61, 0.06);
}

.page-about .about-index--paper {
  color: rgba(42, 33, 24, 0.62);
}

.page-about .about-sec__title--paper {
  color: var(--brown);
}

.page-about .about-sec__note--paper {
  color: rgba(42, 33, 24, 0.72);
}

.page-about .about-team {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .about-team__cap {
  caption-side: top;
  text-align: left;
  padding-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: rgba(42, 33, 24, 0.6);
}

.page-about .about-team thead th {
  text-align: left;
  padding: 10px 10px 10px 0;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: rgba(42, 33, 24, 0.66);
  border-bottom: 1px solid rgba(42, 33, 24, 0.28);
}

.page-about .about-team tbody tr {
  border-bottom: 1px solid rgba(42, 33, 24, 0.14);
  transition: background var(--t-fast);
}

.page-about .about-team tbody tr:hover {
  background: rgba(182, 255, 60, 0.28);
}

.page-about .about-team th[scope="row"] {
  text-align: left;
  padding: 14px 10px 14px 4px;
  font-size: 15px;
  font-weight: 600;
  color: var(--brown);
  white-space: nowrap;
}

.page-about .about-team td {
  padding: 14px 10px 14px 0;
  line-height: 1.62;
  color: rgba(42, 33, 24, 0.86);
  vertical-align: top;
}

.page-about .about-team td.num {
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: #8a3f00;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* ============ 合作生态 ============ */
.page-about .about-eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .about-eco__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--silver);
}

.page-about .about-eco__list {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-eco__item {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  align-items: baseline;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-eco__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 5vw, 34px);
  line-height: 1;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-eco__label {
  font-size: 14px;
  line-height: 1.6;
  color: var(--silver);
}

.page-about .about-eco__main .btn {
  margin-top: 22px;
}

.page-about .about-eco__media {
  margin: 0;
}

.page-about .about-eco__media .media__cap {
  margin-top: 10px;
  font-size: 12px;
  color: var(--muted);
}

/* ============ 四分区强调色 ============ */
.page-about .about-palette {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-palette__item {
  background: var(--charcoal);
  padding: 20px 18px 22px;
  min-width: 0;
}

.page-about .about-palette__chip {
  display: block;
  width: 100%;
  height: 6px;
  margin-bottom: 16px;
}

.page-about .about-palette__item[data-tone="lime"] .about-palette__chip {
  background: var(--lime);
}

.page-about .about-palette__item[data-tone="orange"] .about-palette__chip {
  background: var(--orange);
}

.page-about .about-palette__item[data-tone="silver"] .about-palette__chip {
  background: var(--silver);
}

.page-about .about-palette__item[data-tone="indigo"] .about-palette__chip {
  background: var(--indigo-2);
  box-shadow: inset 0 0 0 1px var(--line-strong);
}

.page-about .about-palette__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 400;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .about-palette__desc {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.66;
  color: var(--silver);
}

.page-about .about-numeral {
  margin-top: 26px;
  padding: 22px 18px 20px;
  background: var(--indigo-2);
  border-left: 3px solid var(--lime);
}

.page-about .about-numeral__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--paper);
  max-width: 62ch;
}

.page-about .about-numeral__demo {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.page-about .about-numeral__demo .num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 6vw, 42px);
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

.page-about .about-numeral__demo .num:nth-child(2) {
  color: var(--silver);
}

.page-about .about-numeral__demo .num:nth-child(3) {
  color: var(--orange);
}

.page-about .about-numeral__demo .num:nth-child(4) {
  color: var(--paper);
}

/* ============ 窄屏表格转块 ============ */
@media (max-width: 719px) {
  .page-about .about-team,
  .page-about .about-team tbody,
  .page-about .about-team tr,
  .page-about .about-team th,
  .page-about .about-team td {
    display: block;
    width: 100%;
  }

  .page-about .about-team thead {
    display: none;
  }

  .page-about .about-team tbody tr {
    padding: 14px 0 12px;
    border-bottom: 1px solid rgba(42, 33, 24, 0.2);
  }

  .page-about .about-team th[scope="row"] {
    padding: 0 0 4px;
    font-size: 16px;
  }

  .page-about .about-team td {
    padding: 2px 0;
  }

  .page-about .about-team td.num {
    font-size: 17px;
    color: #8a3f00;
  }

  .page-about .about-team td.num::after {
    content: " 人";
    font-family: var(--font-body);
    font-size: 13px;
    color: rgba(42, 33, 24, 0.7);
  }
}

/* ============ 平板 ============ */
@media (min-width: 720px) {
  .page-about .about-palette {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-hero__grid {
    gap: 30px;
  }

  .page-about .about-era__summary {
    padding-right: 20px;
  }

  .page-about .about-era__body {
    padding-right: 20px;
  }
}

/* ============ 桌面 ============ */
@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    column-gap: 46px;
    align-items: end;
    padding: 44px 0 32px;
  }

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

  .page-about .about-hero__fact {
    padding: 16px 18px 18px;
  }

  .page-about .about-hero__media {
    margin-top: 26px;
  }

  .page-about .about-step {
    grid-template-columns: 62px minmax(0, 1fr) 190px;
    align-items: start;
    gap: 0 20px;
    padding: 24px 0;
  }

  .page-about .about-step__idx {
    grid-row: 1 / span 1;
    font-size: 30px;
  }

  .page-about .about-step__body {
    grid-column: 2;
  }

  .page-about .about-step__time {
    grid-column: 3;
    margin-top: 4px;
    text-align: right;
  }

  .page-about .about-era {
    grid-template-columns: 250px minmax(0, 1fr);
    column-gap: 30px;
  }

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

  .page-about .about-era__body {
    padding: 20px 16px 26px 0;
  }

  .page-about .about-era__title {
    font-size: 18px;
  }

  .page-about .about-eco {
    grid-template-columns: minmax(0, 1fr) 300px;
    column-gap: 40px;
    align-items: start;
  }

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

  .page-about .about-paper {
    padding: 36px 32px 38px;
  }

  .page-about .about-axis svg {
    height: 96px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 200px minmax(0, 1fr);
    column-gap: 52px;
    padding-top: 56px;
    padding-bottom: 56px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
    margin-top: 14px;
  }

  .page-about .about-toc__item {
    flex: 0 0 auto;
  }

  .page-about .about-toc__link {
    padding: 9px 0 9px 14px;
    border: 0;
    border-left: 1px solid var(--line);
    white-space: normal;
    font-size: 13.5px;
  }

  .page-about .about-toc__link[aria-current] {
    color: var(--lime);
    background: transparent;
    border-color: transparent;
    border-left-color: var(--lime);
  }

  .page-about .about-toc__link[aria-current] .about-toc__num {
    color: var(--lime);
  }

  .page-about .about-sec {
    padding-bottom: 56px;
  }

  .page-about .about-sec + .about-sec {
    padding-top: 52px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-body {
    grid-template-columns: 220px minmax(0, 1fr);
    column-gap: 64px;
  }
}