/* ===== 江畔档案 / page-about ===== */
.page-about {
  --about-rail: 196px;
  padding-bottom: 88px;
  overflow-wrap: break-word;
}

.page-about .breadcrumb {
  margin: 22px 0 20px;
  font-size: 13.5px;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

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

.page-about .breadcrumb-link {
  color: var(--teal);
  text-decoration: none;
  border-bottom: 2px solid var(--sand);
  padding-bottom: 1px;
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--brick);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 26px;
  margin-bottom: 56px;
}

.page-about .hero-copy {
  position: relative;
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-hard);
  padding: 32px 22px 26px;
  overflow: hidden;
}

.page-about .hero-copy::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 8px;
  background: linear-gradient(to right, var(--deep), var(--teal) 42%, var(--sand) 74%, var(--brick));
}

.page-about .about-hero h1 {
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(29px, 6.2vw, 50px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 14px 0 16px;
}

.page-about .hero-lede {
  margin: 0 0 22px;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-bottom: 22px;
  padding-top: 16px;
  border-top: 1px dashed var(--mist);
}

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

.page-about .hero-media {
  margin: 0;
  position: relative;
  display: block;
  min-height: 240px;
  background: var(--shallow);
  border: 2px solid var(--ink);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .hero-media img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 240px;
  object-fit: cover;
}

.page-about .hero-media .media-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 9px 14px;
  background: rgba(14, 75, 71, 0.92);
  color: var(--cream);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.03em;
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 34px;
}

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

/* ---------- 年份索引栏 ---------- */
.page-about .year-rail {
  display: none;
}

.page-about .rail-title {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .rail-title--sub {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px dashed var(--mist);
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 3px;
}

.page-about .rail-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 8px;
  border-radius: 7px;
  font-size: 13.5px;
  color: var(--ink);
  text-decoration: none;
  transition: background 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  background: var(--shallow);
  color: var(--deep);
}

.page-about .rail-year {
  flex: none;
  width: 4ch;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--teal);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline-block .section-head {
  margin-bottom: 28px;
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 30px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 29px;
  top: 26px;
  bottom: 26px;
  width: 2px;
  background-image: repeating-linear-gradient(
    to bottom,
    var(--teal) 0,
    var(--teal) 6px,
    transparent 6px,
    transparent 13px
  );
}

.page-about .tl-node {
  display: grid;
  grid-template-columns: 60px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  scroll-margin-top: 96px;
}

.page-about .tl-year {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 60px;
  height: 60px;
  background: var(--deep);
  color: var(--sand);
  border: 2px solid var(--ink);
  border-radius: 10px;
  box-shadow: 4px 4px 0 var(--sand);
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  transform: rotate(-2deg);
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .tl-node:hover .tl-year {
  transform: rotate(0deg) scale(1.04);
  box-shadow: 6px 6px 0 var(--brick);
}

.page-about .tl-card {
  min-width: 0;
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: var(--radius-card);
  padding: 20px 20px 18px;
  box-shadow: 5px 5px 0 var(--teal);
}

.page-about .tl-node:nth-child(even) .tl-card {
  box-shadow: 5px 5px 0 var(--sand);
}

.page-about .tl-stage {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--brick);
}

.page-about .tl-title {
  margin: 0 0 12px;
  font-family: var(--serif);
  font-weight: 800;
  font-size: 21px;
  line-height: 1.4;
  color: var(--deep);
}

.page-about .tl-text {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .tl-solved {
  margin: 0;
  padding: 11px 14px;
  background: var(--sand-soft);
  border-left: 4px solid var(--brick);
  border-radius: 0 8px 8px 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .tl-solved-label {
  display: block;
  margin-bottom: 3px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--brick);
}

.page-about .tl-figure {
  margin: 16px 0 0;
  background: var(--shallow);
  border: 2px solid var(--ink);
  border-radius: 10px;
  box-shadow: 4px 4px 0 var(--deep);
  overflow: hidden;
}

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

.page-about .tl-figure figcaption {
  padding: 9px 13px;
  border-top: 2px solid var(--ink);
  background: var(--paper);
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .team-block {
  margin-top: 60px;
  padding: 30px 22px;
  background: var(--shallow);
  border: 2px solid var(--ink);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-hard);
  scroll-margin-top: 96px;
}

.page-about .team-lede {
  margin: 16px 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .team-bar {
  display: flex;
  height: 62px;
  margin: 24px 0 20px;
  border: 2px solid var(--ink);
  border-radius: 10px;
  box-shadow: 4px 4px 0 var(--ink);
  overflow: hidden;
}

.page-about .team-seg {
  display: grid;
  place-items: center;
  min-width: 0;
  font-family: var(--mono);
  font-size: 17px;
  font-weight: 600;
  transition: filter 0.2s var(--ease);
}

.page-about .team-seg--dev {
  flex: 34 1 0;
  background: var(--deep);
  color: var(--sand);
}

.page-about .team-seg--doc {
  flex: 16 1 0;
  background: var(--teal);
  color: var(--cream);
}

.page-about .team-seg--svc {
  flex: 12 1 0;
  background: var(--sand);
  color: var(--ink);
}

.page-about .team-seg:hover {
  filter: brightness(1.12);
}

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

.page-about .team-card {
  min-width: 0;
  padding: 18px 16px;
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: 12px;
}

.page-about .team-card:nth-child(1) {
  box-shadow: 4px 4px 0 var(--deep);
}

.page-about .team-card:nth-child(2) {
  box-shadow: 4px 4px 0 var(--teal);
}

.page-about .team-card:nth-child(3) {
  box-shadow: 4px 4px 0 var(--sand);
}

.page-about .team-card h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 8px;
  font-family: var(--sans);
  font-weight: 700;
  font-size: 14.5px;
  letter-spacing: 0.02em;
  color: var(--deep);
}

.page-about .team-dot {
  flex: none;
  width: 10px;
  height: 10px;
  border: 2px solid var(--ink);
  border-radius: 50%;
}

.page-about .team-dot--dev {
  background: var(--deep);
}

.page-about .team-dot--doc {
  background: var(--teal);
}

.page-about .team-dot--svc {
  background: var(--sand);
}

.page-about .team-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .team-figure {
  margin: 22px 0 0;
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: 12px;
  box-shadow: 5px 5px 0 var(--ink);
  overflow: hidden;
}

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

.page-about .team-figure figcaption {
  padding: 9px 14px;
  border-top: 2px solid var(--ink);
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--mist);
}

/* ---------- 资质 ---------- */
.page-about .cred-block {
  margin-top: 56px;
  scroll-margin-top: 96px;
}

.page-about .cred-grid {
  display: grid;
  gap: 18px;
  margin-top: 22px;
}

.page-about .cred-card {
  min-width: 0;
  padding: 24px 22px;
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: var(--radius-card);
  box-shadow: 5px 5px 0 var(--sand);
}

.page-about .cred-seal {
  display: inline-block;
  margin: 0 0 12px;
  padding: 4px 11px;
  background: var(--sand-soft);
  border: 2px solid var(--sand);
  border-radius: var(--radius-pill);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--brick);
}

.page-about .cred-card h3 {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.4;
  color: var(--deep);
}

.page-about .cred-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .cred-note {
  margin: 22px 0 0;
  padding: 14px 16px;
  background: var(--paper);
  border: 2px dashed var(--teal);
  border-radius: 10px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .cred-note strong {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--teal);
  margin-right: 6px;
}

/* ---------- 覆盖与节奏 ---------- */
.page-about .reach-block {
  margin-top: 56px;
  padding: 32px 22px;
  background: var(--deep);
  border: 2px solid var(--ink);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-hard);
  scroll-margin-top: 96px;
}

.page-about .reach-block .section-label {
  color: var(--sand);
}

.page-about .reach-block .section-title {
  color: var(--cream);
}

.page-about .reach-block > p {
  margin: 16px 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--shallow);
}

.page-about .reach-chips {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 0;
  padding: 0;
}

.page-about .reach-chip {
  padding: 6px 13px;
  border: 2px solid rgba(243, 237, 224, 0.42);
  border-radius: var(--radius-pill);
  font-size: 13px;
  color: var(--cream);
}

.page-about .reach-rhythm {
  display: grid;
  gap: 18px;
  margin-top: 26px;
  padding-top: 22px;
  border-top: 2px dashed rgba(243, 237, 224, 0.28);
}

.page-about .rhythm-item {
  min-width: 0;
}

.page-about .rhythm-item h3 {
  margin: 0 0 6px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--sand);
}

.page-about .rhythm-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--shallow);
}

/* ---------- 结尾去处 ---------- */
.page-about .about-cta {
  margin-top: 56px;
  padding: 28px 22px;
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta h2 {
  margin: 0 0 12px;
  font-family: var(--serif);
  font-weight: 800;
  font-size: 24px;
  line-height: 1.35;
  color: var(--deep);
}

.page-about .about-cta p {
  margin: 0 0 20px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink);
}

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

/* ===== 响应式 ===== */
@media (min-width: 640px) {
  .page-about .hero-copy {
    padding: 40px 34px 32px;
  }

  .page-about .about-cta,
  .page-about .team-block,
  .page-about .reach-block {
    padding: 40px 34px;
  }

  .page-about .tl-card {
    padding: 24px 26px 22px;
  }
}

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

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

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

@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 34px;
    align-items: stretch;
  }

  .page-about .hero-media {
    min-height: 100%;
  }

  .page-about .team-block {
    margin-top: 72px;
  }
}

@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 46px;
    align-items: start;
  }

  .page-about .year-rail {
    display: block;
    position: sticky;
    top: 92px;
    align-self: start;
    padding: 18px 14px;
    background: var(--paper);
    border: 2px solid var(--ink);
    border-radius: 12px;
    box-shadow: 4px 4px 0 var(--sand);
  }

  .page-about .tl-node {
    grid-template-columns: 68px minmax(0, 1fr);
    gap: 22px;
  }

  .page-about .tl-year {
    width: 68px;
    height: 68px;
    font-size: 15px;
  }

  .page-about .about-timeline::before {
    left: 33px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-year,
  .page-about .team-seg,
  .page-about .rail-link {
    transition: none;
  }

  .page-about .tl-node:hover .tl-year {
    transform: rotate(-2deg);
  }
}