.page-about {
  background: var(--ink-900);
  color: var(--paper);
  overflow-x: hidden;
}

.page-about .shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

.page-about section[id] {
  scroll-margin-top: 90px;
}

/* ---------- 封面 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(26px, 5vw, 56px) clamp(44px, 8vw, 92px);
  background:
    radial-gradient(120% 90% at 82% 0%, rgba(63, 224, 208, .1), transparent 60%),
    linear-gradient(180deg, var(--ink-700) 0%, var(--ink-900) 82%);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(112deg, transparent 46%, var(--cyan-soft) 46.1%, transparent 46.5%),
    linear-gradient(112deg, transparent 68%, var(--orange-soft) 68.1%, transparent 68.4%);
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: 26px;
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-family: var(--f-display);
  font-size: clamp(32px, 7.6vw, 78px);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: .005em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  display: grid;
  gap: 14px;
  border-left: 2px solid var(--cyan);
  padding-left: 18px;
}

.page-about .about-hero__lead p {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--txt-soft);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: end;
  }
  .page-about .about-hero__lead p {
    font-size: 17px;
  }
}

/* ---------- 首屏索引 ---------- */
.page-about .about-index {
  list-style: none;
  margin: clamp(34px, 6vw, 66px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--line);
}

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

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 2px;
  color: var(--txt-soft);
  text-decoration: none;
  transition: color .2s var(--ease), padding-left .2s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--cyan);
  padding-left: 10px;
}

.page-about .about-index__link .num {
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .about-index__label {
  font-size: 15px;
  line-height: 1.5;
}

@media (min-width: 640px) {
  .page-about .about-index {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-index__item:nth-child(odd) {
    border-right: 1px solid var(--line);
    padding-right: 18px;
  }
  .page-about .about-index__item:nth-child(even) {
    padding-left: 18px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-index {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-index__item:nth-child(odd) {
    border-right: 0;
    padding-right: 0;
  }
  .page-about .about-index__item:nth-child(even) {
    padding-left: 0;
  }
  .page-about .about-index__item:nth-child(3n + 1),
  .page-about .about-index__item:nth-child(3n + 2) {
    padding-right: 24px;
  }
  .page-about .about-index__item:nth-child(3n + 2),
  .page-about .about-index__item:nth-child(3n) {
    padding-left: 24px;
  }
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding-block: clamp(46px, 8vw, 100px);
}

.page-about .about-chapter .chapter__num {
  font-family: var(--f-mono);
  font-size: 13px;
  letter-spacing: .24em;
  color: var(--cyan);
  margin: 0 0 14px;
  position: relative;
  padding-left: 34px;
}

.page-about .about-chapter .chapter__num::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 22px;
  height: 1px;
  background: var(--cyan);
}

.page-about .about-chapter .chapter__title {
  margin: 0;
  font-family: var(--f-display);
  font-size: clamp(26px, 4.4vw, 42px);
  font-weight: 700;
  line-height: 1.14;
  color: var(--paper);
}

.page-about .about-chapter .chapter__lead {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--txt-soft);
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-700);
}

.page-about .about-figure--wide {
  margin-top: clamp(28px, 5vw, 52px);
}

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

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

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

.page-about .about-figure__cap {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--cool);
}

/* ---------- 沿革时间轴 ---------- */
.page-about .about-tl {
  list-style: none;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--clay), rgba(180, 100, 60, .08));
}

.page-about .about-tl__item {
  position: relative;
  padding-left: 34px;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  width: 13px;
  height: 13px;
  background: var(--ink-900);
  border: 1px solid var(--clay);
  transform: rotate(45deg);
}

.page-about .about-tl__det > summary {
  list-style: none;
}

.page-about .about-tl__det > summary::-webkit-details-marker {
  display: none;
}

.page-about .about-tl__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
  cursor: pointer;
  transition: border-color .2s var(--ease);
}

.page-about .about-tl__head:hover,
.page-about .about-tl__head:focus-visible {
  border-bottom-color: var(--cyan);
}

.page-about .about-tl__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--f-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-tl__det[open] .about-tl__head::after {
  content: "—";
  color: var(--orange);
}

.page-about .about-tl__tag {
  flex: 0 0 auto;
  font-size: 12px;
  letter-spacing: .14em;
  padding: 3px 9px;
  border: 1px solid var(--clay);
  color: var(--clay);
}

.page-about .about-tl__title {
  font-size: 16px;
  line-height: 1.5;
  color: var(--paper);
}

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

.page-about .about-tl__body p {
  margin: 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--txt-soft);
}

@media (min-width: 768px) {
  .page-about .about-tl__title {
    font-size: 18px;
  }
}

/* ---------- 色带 ---------- */
.page-about .about-band {
  position: relative;
  min-height: 240px;
  display: flex;
  align-items: center;
  background: var(--ink-700);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(142, 151, 163, .14) 0 1px,
    transparent 1px 72px
  );
  pointer-events: none;
}

.page-about .about-band--alt::before {
  background-image: linear-gradient(103deg, transparent 55%, var(--orange-soft) 55.2%, transparent 55.8%);
}

.page-about .about-band > .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-band__line {
  margin: 0;
  max-width: 24ch;
  font-family: var(--f-display);
  font-size: clamp(21px, 3.4vw, 38px);
  font-weight: 600;
  line-height: 1.28;
  color: var(--paper);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 28px;
  margin-top: clamp(28px, 5vw, 48px);
}

.page-about .about-tabs__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
}

.page-about .about-tabs__nav .tab {
  font-family: var(--f-body);
  font-size: 13px;
  line-height: 1;
  padding: 11px 14px;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--cool);
  cursor: pointer;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .about-tabs__nav .tab:hover,
.page-about .about-tabs__nav .tab:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-tabs__nav .tab[aria-selected="true"],
.page-about .about-tabs__nav .tab.is-active,
.page-about .about-tabs__nav .tab.is-open {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-900);
}

.page-about .about-tabs__panels {
  display: grid;
  gap: 22px;
}

.page-about .about-team__panel {
  border-left: 2px solid var(--moss);
  padding: 2px 0 2px 20px;
}

.page-about .about-team__panel h3 {
  margin: 0 0 12px;
  font-family: var(--f-display);
  font-size: 21px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-team__panel p {
  margin: 0 0 12px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--txt-soft);
}

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

@media (min-width: 1024px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
    align-items: start;
  }
}

/* ---------- 覆盖刻度带 ---------- */
.page-about .about-scale {
  margin-top: clamp(28px, 5vw, 48px);
  padding: clamp(22px, 4vw, 40px) clamp(18px, 3.6vw, 40px);
  background: var(--ink-700);
  border: 1px solid var(--line);
}

.page-about .about-scale .eyebrow {
  margin: 0;
}

.page-about .about-scale__rail {
  position: relative;
  height: 2px;
  margin: 38px 6px 0;
  background: linear-gradient(90deg, var(--moss), var(--clay) 52%, var(--cyan));
}

.page-about .about-scale__node {
  position: absolute;
  top: 50%;
  width: 11px;
  height: 11px;
  margin-top: -5.5px;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  transform: translateX(-50%);
}

.page-about .about-scale__node:nth-child(1) {
  left: 0;
  transform: none;
}

.page-about .about-scale__node:nth-child(2) {
  left: 50%;
}

.page-about .about-scale__node:nth-child(3) {
  left: 100%;
  transform: translateX(-100%);
}

.page-about .about-scale__marks {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .about-scale__mark {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-scale__val {
  font-family: var(--f-mono);
  font-size: 32px;
  line-height: 1;
  color: var(--paper);
  letter-spacing: -.01em;
}

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

@media (min-width: 768px) {
  .page-about .about-scale__marks {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-scale__mark:nth-child(2) {
    align-items: center;
    text-align: center;
  }
  .page-about .about-scale__mark:nth-child(3) {
    align-items: flex-end;
    text-align: right;
  }
}

/* ---------- 指标块 ---------- */
.page-about .about-metrics {
  margin-top: clamp(24px, 4vw, 40px);
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-metric__val {
  margin: 0;
  font-family: var(--f-mono);
  font-size: clamp(38px, 6vw, 56px);
  font-weight: 500;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-metric__unit {
  margin: 8px 0 0;
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--orange);
}

.page-about .about-metric__txt {
  margin: 14px 0 0;
  max-width: 42ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--txt-soft);
}

@media (min-width: 900px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 36px;
    border-top: 0;
  }
  .page-about .about-metric {
    border-top: 1px solid var(--line-2);
    padding-top: 22px;
  }
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence {
  display: grid;
  gap: 28px;
  margin-top: clamp(28px, 5vw, 48px);
}

.page-about .about-step {
  padding: 20px 0 22px;
  border-top: 1px solid var(--line);
}

.page-about .about-step__key {
  margin: 0 0 10px;
  font-family: var(--f-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--clay);
}

.page-about .about-step h3 {
  margin: 0 0 10px;
  font-family: var(--f-display);
  font-size: 20px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-step p {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--txt-soft);
}

@media (min-width: 1024px) {
  .page-about .about-cadence {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: start;
  }
}

/* ---------- 本地服务 ---------- */
.page-about .about-chapter--local {
  background: linear-gradient(180deg, var(--ink-900), var(--ink-700) 40%, var(--ink-900));
}

.page-about .about-local {
  margin-top: clamp(28px, 5vw, 48px);
  display: grid;
  gap: 18px;
}

.page-about .about-local__card {
  border: 1px solid var(--line);
  background: rgba(43, 49, 56, .42);
  padding: clamp(22px, 3.4vw, 32px);
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .about-local__card:hover {
  border-color: var(--line-2);
  transform: translateY(-4px);
}

.page-about .about-local__card .eyebrow {
  margin: 0;
  color: var(--moss);
}

.page-about .about-local__card h3 {
  margin: 0;
  font-family: var(--f-display);
  font-size: 20px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-local__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--txt-soft);
  flex: 1 1 auto;
}

.page-about .about-local__card .btn {
  align-self: flex-start;
}

@media (min-width: 900px) {
  .page-about .about-local {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }
}

/* ---------- 合作与认可 ---------- */
.page-about .about-partners {
  margin-top: clamp(28px, 5vw, 48px);
  display: grid;
  gap: 34px;
}

.page-about .about-partners__main h3 {
  margin: 0 0 14px;
  font-family: var(--f-display);
  font-size: 22px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-partners__main p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--txt-soft);
}

.page-about .about-partners__main .btn {
  margin-top: 6px;
}

.page-about .about-partners__side {
  border-left: 1px solid var(--line);
  padding-left: 22px;
  display: grid;
  gap: 20px;
  align-content: start;
}

.page-about .about-honor {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .about-honor__year {
  flex: 0 0 auto;
  font-family: var(--f-mono);
  font-size: 24px;
  line-height: 1;
  color: var(--clay);
}

.page-about .about-honor__txt {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--txt-soft);
}

.page-about .about-honor__note {
  margin: 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.8;
  color: var(--cool);
}

@media (min-width: 1024px) {
  .page-about .about-partners {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
  }
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta {
  margin-top: clamp(38px, 6vw, 68px);
  padding: clamp(24px, 4vw, 40px);
  background: var(--ink-700);
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--f-display);
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-cta__txt {
  margin: 12px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--txt-soft);
}

.page-about .about-cta__actions {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 通用按钮在深色底上的落位 ---------- */
.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--f-mono);
  font-size: 13px;
  letter-spacing: .06em;
  line-height: 1;
  padding: 13px 20px;
  border: 1px solid transparent;
  text-decoration: none;
  transition: background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .btn:hover {
  transform: translateY(-2px);
}

.page-about .btn--solid {
  background: var(--cyan);
  color: var(--ink-900);
}

.page-about .btn--solid:hover {
  background: var(--paper);
}

.page-about .btn--ghost {
  background: transparent;
  border-color: var(--line-2);
  color: var(--txt-soft);
}

.page-about .btn--ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

/* ---------- 窄屏兜底 ---------- */
@media (max-width: 479px) {
  .page-about .about-index__link {
    flex-wrap: wrap;
    gap: 6px 10px;
  }
  .page-about .about-tl__head {
    flex-wrap: wrap;
    gap: 8px 12px;
  }
  .page-about .about-tl__head::after {
    margin-left: 0;
  }
  .page-about .about-partners__side {
    border-left: 0;
    border-top: 1px solid var(--line);
    padding-left: 0;
    padding-top: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-local__card:hover,
  .page-about .btn:hover {
    transform: none;
  }
}