.page-about,
.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about {
  background: var(--bone);
  color: var(--ink);
  font-family: var(--font-body);
}

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

/* 面包屑 */
.page-about .about-crumb {
  padding-top: 18px;
}

.page-about .about-crumb .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.page-about .about-crumb .breadcrumb a {
  color: var(--brown);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-crumb .breadcrumb a:hover {
  border-bottom-color: var(--chili);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 24px 0 54px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  left: -12%;
  bottom: -80px;
  width: 78%;
  height: 240px;
  background: linear-gradient(120deg, var(--malt), rgba(233, 212, 184, 0) 72%);
  transform: rotate(-6deg);
  opacity: 0.6;
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  display: grid;
  gap: 30px;
}

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

.page-about .about-hero .eyebrow {
  margin: 0 0 12px;
  color: var(--greyblue);
}

.page-about .about-hero h1 {
  margin: 0 0 16px;
  max-width: 17em;
  font-family: var(--font-head);
  font-size: clamp(28px, 7vw, 52px);
  font-weight: 800;
  line-height: 1.13;
  letter-spacing: -0.012em;
  color: var(--brown);
}

.page-about .about-lede {
  margin: 0 0 24px;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 28px;
  margin: 0 0 26px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .hero-stat {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .hero-num {
  font-family: var(--font-mono);
  font-size: 25px;
  font-weight: 700;
  color: var(--chili);
  letter-spacing: -0.01em;
}

.page-about .hero-unit {
  font-size: 13px;
  color: var(--ink-soft);
}

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

.page-about .about-hero-figure {
  margin: 0;
  background: var(--brown);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 36px), calc(100% - 36px) 100%, 0 100%);
}

.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* 章节通用头 */
.page-about .section-head {
  margin-bottom: 24px;
  max-width: 62ch;
}

.page-about .section-head .eyebrow {
  margin: 0 0 10px;
  color: var(--greyblue);
}

.page-about .section-head h2 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: clamp(22px, 4.6vw, 34px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--brown);
}

.page-about .section-sub {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--ink-soft);
}

/* 时间轴 */
.page-about .about-timeline-sec {
  padding: 6px 0 48px;
}

.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--orange), var(--malt));
}

.page-about .tl-item {
  position: relative;
  padding-left: 38px;
}

.page-about .tl-item + .tl-item {
  margin-top: 4px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 22px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bone);
  border: 3px solid var(--chili);
}

.page-about .tl-link {
  display: block;
  padding: 14px 14px 15px;
  border-radius: var(--radius-m);
  text-decoration: none;
  color: inherit;
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .tl-link:hover {
  background: var(--malt);
  box-shadow: var(--shadow-soft);
}

.page-about .tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--amber);
}

.page-about .tl-body {
  display: block;
  margin-top: 4px;
}

.page-about .tl-name {
  display: block;
  font-size: 16px;
  font-weight: 700;
  color: var(--charcoal);
}

.page-about .tl-desc {
  display: block;
  margin-top: 5px;
  max-width: 52ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .tl-go {
  display: inline-block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--chili);
  border-bottom: 1px solid rgba(197, 51, 45, 0.35);
  transition: border-color var(--dur) var(--ease);
}

.page-about .tl-link:hover .tl-go {
  border-bottom-color: var(--chili);
}

/* 工坊运转 */
.page-about .about-workshop {
  padding: 48px 0;
  background: var(--malt);
}

.page-about .about-workshop-grid {
  display: grid;
  gap: 30px;
}

.page-about .flow-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .flow-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 12px;
  padding: 15px 16px;
  background: var(--bone);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .flow-item:hover {
  border-color: var(--chili);
  box-shadow: var(--shadow-soft);
}

.page-about .flow-num {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--amber);
}

.page-about .flow-item h3 {
  margin: 0 0 5px;
  font-size: 16px;
  font-weight: 700;
  color: var(--brown);
}

.page-about .flow-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink-soft);
}

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

.page-about .workshop-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius-m);
  border: 1px solid var(--line-strong);
}

.page-about .workshop-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
}

/* 团队与区域网络 */
.page-about .about-network {
  padding: 48px 0;
  background: var(--bone);
}

.page-about .network-grid {
  display: grid;
  gap: 26px;
}

.page-about .team-block h3,
.page-about .coverage-block h3 {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--greyblue);
}

.page-about .team-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

.page-about .team-list li {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 2px 12px;
  align-items: baseline;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .team-num {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  color: var(--chili);
}

.page-about .team-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--charcoal);
}

.page-about .team-note {
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink-soft);
}

.page-about .coverage-block p {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--ink-soft);
}

.page-about .coverage-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .coverage-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  padding: 11px 14px;
  background: var(--paper);
  border-left: 3px solid var(--orange);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
}

.page-about .cv-k {
  min-width: 40px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--greyblue);
}

.page-about .cv-v {
  font-size: 14px;
  color: var(--brown);
}

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

.page-about .network-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
}

/* 旧版资料书架 */
.page-about .about-archive {
  padding: 48px 0;
  background: var(--paper);
}

.page-about .shelf-track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(238px, 82%);
  gap: 14px;
  padding: 4px 4px 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .shelf-card {
  scroll-snap-align: start;
  padding: 16px;
  background: var(--bone);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-m);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .shelf-card:hover {
  border-color: var(--chili);
  box-shadow: var(--shadow-soft);
}

.page-about .shelf-type {
  margin: 0 0 7px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--chili);
}

.page-about .shelf-card h3 {
  margin: 0 0 7px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--brown);
}

.page-about .shelf-desc {
  margin: 0 0 12px;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--ink-soft);
}

.page-about .shelf-meta {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin: 0;
  padding-top: 10px;
  border-top: 1px dashed var(--line-strong);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--greyblue);
  opacity: 0.72;
  transition: opacity var(--dur) var(--ease);
}

.page-about .shelf-card:hover .shelf-meta {
  opacity: 1;
}

.page-about .archive-note {
  margin: 22px 0 0;
  max-width: 72ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .archive-note a {
  color: var(--chili);
  text-decoration: none;
  border-bottom: 1px solid rgba(197, 51, 45, 0.4);
  transition: border-color var(--dur) var(--ease);
}

.page-about .archive-note a:hover {
  border-bottom-color: var(--chili);
}

/* 资质 */
.page-about .about-quality {
  padding: 48px 0;
  background: var(--brown);
  color: var(--bone);
}

.page-about .about-quality .section-head .eyebrow {
  color: var(--orange);
}

.page-about .about-quality .section-head h2 {
  color: var(--bone);
}

.page-about .cert-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .cert-chip {
  padding: 14px 16px;
  border: 1px solid rgba(251, 245, 236, 0.28);
  border-radius: var(--radius-m);
  background: rgba(251, 245, 236, 0.04);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .cert-chip:hover {
  border-color: var(--orange);
  background: rgba(251, 245, 236, 0.1);
}

.page-about .cert-name {
  display: block;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--malt);
}

.page-about .cert-scope {
  display: block;
  margin-top: 5px;
  font-size: 13px;
  line-height: 1.72;
  color: rgba(251, 245, 236, 0.74);
}

.page-about .quality-more {
  margin: 24px 0 0;
  max-width: 68ch;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(251, 245, 236, 0.8);
}

/* 合作方式 */
.page-about .about-coop {
  padding: 48px 0 60px;
  background: var(--bone);
}

.page-about .about-coop-grid {
  display: grid;
  gap: 28px;
}

.page-about .coop-main p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .step-list {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .step-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--charcoal);
}

.page-about .step-k {
  min-width: 56px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-about .coop-panel {
  padding: 22px;
  background: var(--malt);
}

.page-about .coop-panel h3 {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--brown);
}

.page-about .coop-links {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .coop-links a {
  display: block;
  padding: 13px 14px;
  background: var(--bone);
  border: 1px solid transparent;
  border-radius: var(--radius-s);
  text-decoration: none;
  color: var(--brown);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .coop-links a:hover {
  border-color: var(--chili);
  background: var(--paper);
}

.page-about .coop-links span {
  display: block;
  font-size: 14.5px;
  font-weight: 700;
}

.page-about .coop-links em {
  display: block;
  margin-top: 3px;
  font-style: normal;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ink-soft);
}

/* 断点 */
@media (min-width: 640px) {
  .page-about .shelf-track {
    grid-auto-columns: minmax(260px, 46%);
  }

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

  .page-about .cert-list .cert-chip:last-child:nth-child(odd) {
    grid-column: 1 / -1;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero {
    padding: 34px 0 74px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
    align-items: center;
    gap: 52px;
  }

  .page-about .about-workshop-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .network-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 40px;
  }

  .page-about .shelf-track {
    grid-auto-flow: row;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    overflow: visible;
    padding-bottom: 4px;
  }

  .page-about .about-coop-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 48px;
    align-items: start;
  }
}

@media (min-width: 820px) {
  .page-about .tl-link {
    display: grid;
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
    padding: 16px 18px;
  }

  .page-about .tl-year {
    font-size: 28px;
  }

  .page-about .tl-body {
    margin-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}