.page-about {
  background: var(--paper);
  color: var(--graphite);
  font-family: var(--font-sans);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 18px var(--pad) 0;
  font-size: 0.8rem;
  color: var(--lead);
}

.page-about .breadcrumb a {
  color: var(--ink-blue);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  padding-bottom: 1px;
  transition: border-color var(--fast) var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  border-bottom-color: var(--lime);
}

.page-about .crumb-sep {
  margin: 0 8px;
  color: var(--lead);
}

.page-about .crumb-current {
  font-weight: 700;
  color: var(--graphite);
}

/* ---------- 顶部刊头 ---------- */
.page-about .about-masthead {
  position: relative;
  margin-top: 16px;
  padding: 46px var(--pad) 66px;
  background: var(--ink-blue);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), 0 100%);
  overflow: hidden;
}

.page-about .about-masthead::before {
  content: "";
  position: absolute;
  top: -70px;
  right: -60px;
  width: 260px;
  height: 220px;
  background: var(--lake);
  opacity: 0.22;
  transform: rotate(12deg);
  pointer-events: none;
}

.page-about .about-masthead::after {
  content: "";
  position: absolute;
  bottom: 26px;
  left: -50px;
  width: 200px;
  height: 14px;
  background: var(--lime);
  transform: skewX(-24deg);
  pointer-events: none;
}

.page-about .about-masthead-inner {
  position: relative;
  z-index: 1;
  max-width: 940px;
  margin: 0 auto;
  text-align: center;
}

.page-about .about-kicker {
  display: inline-block;
  margin: 0 0 20px;
  padding: 5px 14px;
  background: var(--lime);
  color: var(--night-ink);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  border: 2px solid var(--night-ink);
  transform: rotate(-1.6deg);
}

.page-about .about-title {
  margin: 0 0 20px;
  font-size: clamp(1.68rem, 6.2vw, 3.1rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-lead {
  max-width: 660px;
  margin: 0 auto;
  font-size: clamp(0.94rem, 2.7vw, 1.04rem);
  line-height: 1.85;
  color: var(--ice);
}

.page-about .about-chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-chips li {
  padding: 5px 12px;
  border: 2px solid var(--lake);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
}

/* ---------- 通用章节 ---------- */
.page-about .section {
  padding: 52px 0;
}

.page-about .about-dark {
  background: var(--ink-blue);
  color: var(--paper);
}

.page-about .section-head {
  margin-bottom: 34px;
}

.page-about .section-index {
  display: inline-block;
  margin: 0 0 14px;
  padding: 2px 10px;
  background: var(--sunset);
  color: var(--night-ink);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  border: 2px solid var(--night-ink);
}

.page-about .section-title {
  margin: 0 0 12px;
  font-size: clamp(1.32rem, 4.2vw, 2rem);
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink-blue);
}

.page-about .about-dark .section-title {
  color: var(--paper);
}

.page-about .section-lead {
  max-width: 640px;
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--lead);
}

.page-about .about-dark .section-lead {
  color: var(--ice);
}

.page-about .about-dark .section-index {
  border-color: var(--ink-blue);
}

/* ---------- 01 时间线 ---------- */
.page-about .tl {
  margin: 0;
  padding: 0 0 0 18px;
  list-style: none;
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 44px 26px;
  border-left: 2px solid var(--ink-blue);
}

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

.page-about .tl-node {
  position: absolute;
  left: -9px;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--sunset);
  border: 2px solid var(--night-ink);
  box-shadow: 0 0 0 4px var(--paper);
  transition: transform var(--fast) var(--ease);
}

.page-about .tl-item:hover .tl-node,
.page-about .tl-item:focus-within .tl-node {
  transform: scale(1.28);
}

.page-about .tl-year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink-blue);
}

.page-about .tl-title {
  margin: 0 0 10px;
  font-size: 1.08rem;
  font-weight: 800;
  line-height: 1.5;
  color: var(--ink-blue);
}

.page-about .tl-body p {
  max-width: 40em;
  margin: 0 0 12px;
  font-size: 0.94rem;
  line-height: 1.82;
  color: var(--graphite);
}

.page-about .tl-note {
  padding-left: 12px;
  border-left: 3px solid var(--lake);
  font-size: 0.86rem !important;
  color: var(--lead) !important;
}

.page-about .tl-figure {
  margin: 18px 0 0;
}

.page-about .tl-more {
  max-height: none;
  opacity: 1;
}

/* ---------- 02 版本节奏 ---------- */
.page-about .vscale {
  display: grid;
  gap: 18px;
  margin-bottom: 30px;
}

.page-about .vscale-row {
  padding: 18px;
  border: 2px solid var(--ice);
  background: rgba(169, 197, 255, 0.07);
}

.page-about .vscale-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 14px;
}

.page-about .vscale-label {
  font-size: 1rem;
  font-weight: 800;
  color: var(--paper);
}

.page-about .vscale-freq {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--sunset);
}

.page-about .vscale-ticks {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 1fr;
  gap: 4px;
  height: 16px;
  margin-bottom: 12px;
}

.page-about .vscale-ticks span {
  border: 1px solid var(--night-ink);
  background: var(--mist);
}

.page-about .vscale-row--q .vscale-ticks span {
  background: var(--sunset);
}

.page-about .vscale-row--m .vscale-ticks span {
  background: var(--lake);
}

.page-about .vscale-desc {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.78;
  color: var(--ice);
}

.page-about .vnotes {
  display: grid;
  gap: 12px;
}

.page-about .vnote {
  border: 2px solid var(--ice);
  background: var(--night-ink);
}

.page-about .vnote summary {
  padding: 14px 16px;
  cursor: pointer;
  font-size: 0.94rem;
  font-weight: 700;
  color: var(--paper);
  list-style: none;
  transition: background var(--fast) var(--ease);
}

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

.page-about .vnote summary::after {
  content: "+";
  float: right;
  margin-left: 12px;
  font-family: var(--font-mono);
  color: var(--lime);
}

.page-about .vnote[open] summary::after {
  content: "−";
}

.page-about .vnote summary:hover,
.page-about .vnote summary:focus-visible {
  background: rgba(0, 230, 118, 0.08);
}

.page-about .vnote p {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--ice);
}

.page-about .vnote a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

/* ---------- 03 查询路径 ---------- */
.page-about .routes {
  display: grid;
  gap: 0;
}

.page-about .route-step {
  position: relative;
  padding: 20px;
  border: 2px solid var(--night-ink);
  background: var(--card-white);
  box-shadow: var(--hard-sm);
}

.page-about .route-step--fork {
  background: var(--paper);
}

.page-about .route-kicker {
  display: inline-block;
  margin: 0 0 12px;
  padding: 2px 10px;
  background: var(--ink-blue);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
}

.page-about .route-text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.82;
  color: var(--graphite);
}

.page-about .route-text a,
.page-about .route-list a {
  color: var(--ink-blue);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--lime);
}

.page-about .route-arrow {
  padding: 6px 0 6px 26px;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--sunset);
}

.page-about .route-list {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .route-list li {
  padding-left: 14px;
  border-left: 3px solid var(--lake);
}

.page-about .route-tag {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--lead);
}

.page-about .route-list p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--graphite);
}

/* ---------- 04 服务规模 ---------- */
.page-about .scale-layout {
  align-items: start;
}

.page-about .scaleband-list {
  display: grid;
  gap: 22px;
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
}

.page-about .scale-item {
  position: relative;
  padding-top: 20px;
  border-top: 2px solid var(--ink-blue);
}

.page-about .scale-item::before {
  content: "";
  position: absolute;
  top: -9px;
  left: 0;
  width: 4px;
  height: 16px;
  background: var(--sunset);
  border: 2px solid var(--night-ink);
}

.page-about .scale-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.55rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--ink-blue);
}

.page-about .scale-label {
  display: block;
  margin-top: 4px;
  font-size: 0.86rem;
  color: var(--lead);
}

.page-about .scale-strip {
  margin: 0;
  padding: 16px 18px;
  background: var(--mist);
  border-left: 6px solid var(--lake);
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--graphite);
}

.page-about .scale-strip-num {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--ink-blue);
}

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

/* ---------- 05 团队生态 ---------- */
.page-about .team-layout {
  align-items: start;
}

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

.page-about .team-list li {
  padding: 16px 0 0;
  border-top: 2px solid var(--lake);
}

.page-about .team-key {
  display: inline-block;
  margin-right: 12px;
  font-size: 0.92rem;
  font-weight: 800;
  color: var(--paper);
}

.page-about .team-val {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--sunset);
}

.page-about .team-desc {
  margin: 8px 0 0;
  font-size: 0.89rem;
  line-height: 1.8;
  color: var(--ice);
}

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

/* ---------- 06 行业认可 ---------- */
.page-about .award-list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 2px solid var(--ink-blue);
}

.page-about .award-item {
  display: grid;
  gap: 10px;
  padding: 22px 0;
  border-bottom: 2px solid var(--mist);
}

.page-about .award-year {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--sunset);
  background: var(--ink-blue);
  justify-self: start;
  padding: 3px 12px;
}

.page-about .award-title {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 800;
  color: var(--ink-blue);
}

.page-about .award-body p {
  margin: 0;
  max-width: 46em;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--lead);
}

/* ---------- 07 三件事 ---------- */
.page-about .creed {
  display: grid;
  gap: 24px;
  margin: 0 0 36px;
  padding: 0;
  list-style: none;
}

.page-about .creed-item {
  position: relative;
  padding-left: 22px;
  border-left: 4px solid var(--lime);
}

.page-about .creed-num {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  color: var(--lake);
}

.page-about .creed-title {
  margin: 0 0 8px;
  font-size: 1.12rem;
  font-weight: 900;
  color: var(--paper);
}

.page-about .creed-item p {
  margin: 0;
  max-width: 42em;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--ice);
}

.page-about .creed-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 图文容器校正 ---------- */
.page-about .frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .frame__caption {
  font-size: 0.78rem;
  color: var(--lead);
}

.page-about .about-dark .frame__caption {
  color: var(--ice);
}

/* ---------- 焦点可见 ---------- */
.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 3px solid var(--lime);
  outline-offset: 2px;
}

/* ---------- 中屏及桌面 ---------- */
@media (min-width: 700px) {
  .page-about .section {
    padding: 68px 0;
  }

  .page-about .about-masthead {
    padding: 64px var(--pad) 88px;
  }

  .page-about .tl {
    padding-left: 34px;
  }

  .page-about .tl-item {
    padding-left: 40px;
    padding-bottom: 56px;
  }

  .page-about .tl-year {
    font-size: 1.75rem;
  }

  .page-about .tl-title {
    font-size: 1.22rem;
  }

  .page-about .vnotes {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .routes {
    grid-template-columns: 1fr;
    max-width: 780px;
  }

  .page-about .route-arrow {
    padding-left: 40px;
  }

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

  .page-about .award-item {
    grid-template-columns: 110px 1fr;
    align-items: start;
    gap: 22px;
  }

  .page-about .creed {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-masthead {
    padding: 78px var(--pad) 104px;
  }

  .page-about .scaleband-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 26px;
  }

  .page-about .scale-figure,
  .page-about .team-figure {
    margin-top: 0;
  }
}

/* ---------- 动效收敛 ---------- */
@media (hover: hover) and (min-width: 700px) {
  .page-about .tl-more {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height var(--slow) var(--ease), opacity var(--slow) var(--ease);
  }

  .page-about .tl-item:hover .tl-more,
  .page-about .tl-item:focus-within .tl-more {
    max-height: 240px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-node,
  .page-about .tl-more,
  .page-about .breadcrumb a,
  .page-about .vnote summary {
    transition: none;
  }

  .page-about .tl-item:hover .tl-node {
    transform: none;
  }
}