.page-about {
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about .about-crumb {
  padding-top: 18px;
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
}

.page-about .breadcrumb a {
  color: var(--harbor);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  border-bottom-color: var(--orange);
  outline: none;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--teal);
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--ink);
  font-weight: 600;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: 16px;
  padding: clamp(26px, 5vw, 60px) 0 clamp(32px, 6vw, 72px);
  background: var(--deep);
  color: var(--mist);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(244, 235, 221, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(244, 235, 221, 0.07) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -10%;
  right: -10%;
  top: 62%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(242, 183, 5, 0.55), transparent);
  transform: rotate(-4deg);
  pointer-events: none;
}

.page-about .hero-shell {
  position: relative;
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
}

.page-about .hero-shot {
  margin: 0;
  background: var(--harbor);
}

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

.page-about .hero-shot figcaption {
  padding: 9px 12px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: rgba(250, 247, 240, 0.68);
}

.page-about .hero-tag {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--yellow);
}

.page-about .hero-title {
  margin: 0.4em 0 0.55em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.9rem, 6vw, 3.6rem);
  line-height: 1.12;
  letter-spacing: -0.03em;
  color: var(--mist);
}

.page-about .hero-lede {
  margin: 0;
  max-width: 36em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: rgba(250, 247, 240, 0.84);
}

.page-about .hero-figures {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 28px;
  margin: 26px 0 0;
  padding-top: 18px;
  border-top: 1px dashed rgba(244, 235, 221, 0.26);
}

.page-about .hero-figures dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--teal);
}

.page-about .hero-figures dd {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 13px;
  color: rgba(250, 247, 240, 0.9);
}

.page-about .hero-figures .fig {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 28px);
  color: var(--yellow);
  margin-right: 4px;
  font-variant-numeric: tabular-nums;
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding: clamp(38px, 7vw, 84px) 0;
}

.page-about .section-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .section-index {
  display: inline-grid;
  place-items: center;
  min-width: 40px;
  height: 30px;
  padding: 0 8px;
  background: var(--yellow);
  color: var(--deep);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 8px 100%, 0 calc(100% - 8px));
}

.page-about .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.45rem, 3.4vw, 2.3rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.page-about .section-lede {
  margin: 0 0 clamp(22px, 3vw, 34px);
  max-width: 46em;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.85;
  color: rgba(36, 26, 23, 0.82);
}

.page-about a:focus-visible {
  outline: 2px solid var(--yellow);
  outline-offset: 3px;
}

/* ---------- 来路 ---------- */
.page-about .about-origin {
  background: var(--cream);
}

.page-about .origin-body {
  display: grid;
  gap: clamp(20px, 3vw, 30px);
  align-items: start;
}

.page-about .origin-text p {
  margin: 0 0 1em;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.9;
  color: var(--ink);
}

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

.page-about .origin-note {
  padding: 20px 20px 22px;
  background: var(--sand);
  border-left: 4px solid var(--orange);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .origin-note-kicker {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--brick);
}

.page-about .origin-note-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(36, 26, 23, 0.86);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-track {
  background: var(--sand);
}

.page-about .track-wrap {
  display: grid;
  gap: clamp(22px, 3.5vw, 42px);
  align-items: start;
}

.page-about .track {
  position: relative;
  margin: 0;
  padding: 0 0 0 34px;
  list-style: none;
  display: grid;
  gap: clamp(14px, 2.2vw, 22px);
}

.page-about .track::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 8px;
  bottom: 8px;
  border-left: 1px dashed rgba(36, 26, 23, 0.34);
}

.page-about .track-node {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px 14px;
  align-items: start;
}

.page-about .track-node::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 14px;
  width: 12px;
  height: 12px;
  background: var(--orange);
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
  transition: background-color 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .track-node:hover::before {
  background: var(--brick);
  transform: scale(1.15);
}

.page-about .track-mark {
  padding-top: 14px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--harbor);
  white-space: nowrap;
}

.page-about .track-node:hover .track-mark {
  color: var(--brick);
}

.page-about .track-card {
  padding: 16px 18px 18px;
  background: var(--mist);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: transform 180ms var(--ease), background-color 180ms var(--ease);
}

.page-about .track-node:hover .track-card {
  transform: translateY(-2px);
  background: #fffdf8;
}

.page-about .track-ver {
  display: inline-block;
  margin-bottom: 8px;
  padding: 2px 8px;
  background: var(--deep);
  color: var(--yellow);
  font-size: 11.5px;
  letter-spacing: 0.08em;
}

.page-about .track-card h3 {
  margin: 0 0 0.45em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.page-about .track-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(36, 26, 23, 0.8);
}

.page-about .track-shot {
  margin: 0;
  background: var(--harbor);
}

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

.page-about .track-shot figcaption {
  padding: 9px 12px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: rgba(250, 247, 240, 0.72);
}

.page-about .track-foot {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 48em;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(36, 26, 23, 0.82);
}

.page-about .track-foot a {
  color: var(--brick);
  font-weight: 600;
  text-underline-offset: 3px;
}

/* ---------- 团队 ---------- */
.page-about .about-crew {
  background: var(--cream);
}

.page-about .crew-bento {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .crew-card {
  padding: 18px 18px 20px;
  background: var(--mist);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  transition: transform 180ms var(--ease), background-color 180ms var(--ease);
}

.page-about .crew-card:hover,
.page-about .crew-card:focus-within {
  transform: translateY(-2px);
  background: #fffdf8;
}

.page-about .crew-card h3 {
  margin: 0 0 0.5em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--harbor);
}

.page-about .crew-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(36, 26, 23, 0.8);
}

.page-about .crew-card--count {
  background: var(--deep);
  padding: 22px 20px 24px;
}

.page-about .crew-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(2.6rem, 7vw, 3.4rem);
  line-height: 1;
  color: var(--yellow);
  font-variant-numeric: tabular-nums;
}

.page-about .crew-count-label {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(250, 247, 240, 0.82);
}

.page-about .crew-shot {
  margin: 0;
  background: var(--harbor);
}

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

.page-about .crew-shot figcaption {
  padding: 9px 12px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: rgba(250, 247, 240, 0.72);
}

/* ---------- 协作网络 ---------- */
.page-about .about-net {
  position: relative;
  background: var(--harbor);
  color: var(--mist);
  overflow: hidden;
}

.page-about .about-net::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    115deg,
    rgba(143, 169, 174, 0.14) 0 1px,
    transparent 1px 46px
  );
  pointer-events: none;
}

.page-about .about-net .section-shell {
  position: relative;
}

.page-about .section-head--light .section-title {
  color: var(--mist);
}

.page-about .net-lede {
  margin: 0 0 clamp(20px, 3vw, 28px);
  max-width: 46em;
  font-size: clamp(15px, 1.4vw, 16.5px);
  line-height: 1.9;
  color: rgba(250, 247, 240, 0.84);
}

.page-about .city-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(24px, 4vw, 36px);
  padding: 0;
  list-style: none;
}

.page-about .city-list li {
  padding: 5px 11px;
  border: 1px solid rgba(244, 235, 221, 0.3);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
  transition: background-color 180ms var(--ease), color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .city-list li:hover {
  background: var(--yellow);
  border-color: var(--yellow);
  color: var(--deep);
}

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

.page-about .net-stat {
  padding: 16px 16px 18px;
  background: rgba(11, 31, 51, 0.55);
  border-top: 3px solid var(--orange);
}

.page-about .net-stat--wide {
  grid-column: 1 / -1;
  border-top-color: var(--yellow);
}

.page-about .net-num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 4vw, 2.4rem);
  line-height: 1;
  color: var(--yellow);
  font-variant-numeric: tabular-nums;
}

.page-about .net-label {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(250, 247, 240, 0.84);
}

.page-about .net-label a {
  color: var(--mist);
  font-weight: 600;
  text-underline-offset: 3px;
}

/* ---------- 服务路径 ---------- */
.page-about .about-paths {
  background: var(--cream);
}

.page-about .path-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .path-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px 24px;
  background: var(--mist);
  border-top: 5px solid var(--orange);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
  transition: transform 180ms var(--ease);
}

.page-about .path-card:focus-within {
  transform: translateY(-2px);
}

.page-about .path-index {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--brick);
}

.page-about .path-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.12rem;
  line-height: 1.35;
  color: var(--deep);
}

.page-about .path-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(36, 26, 23, 0.8);
  flex: 1 1 auto;
}

.page-about .path-card .btn {
  align-self: flex-start;
  margin-top: 4px;
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding: clamp(32px, 6vw, 64px) 0;
  background: var(--deep);
  color: var(--mist);
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 0 100%);
}

.page-about .cta-shell {
  display: grid;
  gap: 20px;
  align-items: center;
}

.page-about .cta-title {
  margin: 0 0 0.5em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.3rem, 3vw, 1.9rem);
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--mist);
}

.page-about .cta-copy p {
  margin: 0;
  max-width: 44em;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(250, 247, 240, 0.82);
}

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

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

  .page-about .crew-card--count {
    grid-column: 1 / -1;
  }

  .page-about .crew-shot {
    grid-column: 1 / -1;
  }

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

  .page-about .net-stat--wide {
    grid-column: auto;
  }
}

@media (min-width: 760px) {
  .page-about .path-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .cta-shell {
    grid-template-columns: minmax(0, 1.5fr) auto;
    gap: 32px;
  }
}

@media (min-width: 900px) {
  .page-about .hero-shell {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: clamp(28px, 4vw, 52px);
  }

  .page-about .origin-body {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 0.85fr);
    gap: clamp(26px, 4vw, 56px);
  }

  .page-about .track-wrap {
    grid-template-columns: minmax(0, 1.22fr) minmax(0, 0.78fr);
    gap: clamp(26px, 4vw, 48px);
  }

  .page-about .track-shot {
    position: sticky;
    top: 24px;
  }

  .page-about .track-mark {
    writing-mode: vertical-rl;
    letter-spacing: 0.24em;
    padding-top: 16px;
  }
}

@media (min-width: 1024px) {
  .page-about .crew-bento {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .crew-card--count {
    grid-column: span 2;
    grid-row: span 1;
  }

  .page-about .crew-shot {
    grid-column: span 2;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .breadcrumb a,
  .page-about .track-node::before,
  .page-about .track-card,
  .page-about .crew-card,
  .page-about .city-list li,
  .page-about .path-card {
    transition: none;
  }

  .page-about .track-node:hover .track-card,
  .page-about .track-node:hover::before,
  .page-about .crew-card:hover,
  .page-about .crew-card:focus-within,
  .page-about .path-card:focus-within {
    transform: none;
  }
}