.page-about {
  --about-line: rgba(15, 59, 92, 0.14);
  --about-soft: rgba(28, 43, 54, 0.74);
  display: grid;
  gap: clamp(44px, 6vw, 84px);
  margin-inline: auto;
  max-width: 1180px;
  padding: calc(var(--topbar-h) + 22px) var(--gutter) clamp(56px, 8vw, 96px);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: clip;
}

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

/* 面包屑 */
.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 6px;
  padding: 0;
  list-style: none;
  font-size: 13px;
}

.page-about .breadcrumb-list li:not(:last-child)::after {
  content: "›";
  margin-left: 8px;
  color: var(--slate);
}

.page-about .breadcrumb-link {
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

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

.page-about .breadcrumb-current {
  color: var(--sea);
  font-weight: 600;
}

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

.about-h1 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-size: clamp(30px, 5.6vw, 56px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--sea);
}

.about-h1 em {
  font-style: normal;
  color: var(--orange);
  font-family: var(--font-num);
  padding: 0 2px;
}

.about-lede {
  margin: 18px 0 0;
  max-width: 46em;
  font-size: clamp(15px, 1.9vw, 17px);
  line-height: 1.85;
  color: var(--about-soft);
}

.about-panel {
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--radius-lg);
  background: linear-gradient(158deg, var(--sea) 0%, var(--sea-deep) 100%);
  color: var(--paper);
  box-shadow: var(--shadow-2);
}

.about-panel-title {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: rgba(232, 214, 179, 0.9);
}

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

.about-panel-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 8px;
  padding-top: 15px;
  border-top: 1px solid rgba(247, 241, 231, 0.18);
}

.about-panel-list li:first-child {
  padding-top: 0;
  border-top: 0;
}

.about-panel-num {
  font-family: var(--font-num);
  font-size: clamp(26px, 3.6vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--sand);
}

.about-panel-unit {
  font-size: 13.5px;
  color: rgba(247, 241, 231, 0.88);
}

.about-panel-note {
  flex: 1 0 100%;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(247, 241, 231, 0.62);
}

/* 章节通用 */
.page-about .section {
  display: grid;
  gap: clamp(16px, 2.4vw, 26px);
}

.page-about .section-head {
  display: grid;
  gap: 6px;
}

.page-about .section-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(21px, 3.2vw, 33px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--sea);
}

.page-about .media {
  margin: 0;
}

.page-about .media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius-lg);
  background: var(--sand);
}

.page-about .media-caption {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--slate);
}

.about-inline-link {
  color: var(--orange-deep);
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 107, 58, 0.45);
  transition: color 0.18s ease, border-color 0.18s ease;
}

.about-inline-link:hover,
.about-inline-link:focus-visible {
  color: var(--red);
  border-bottom-color: var(--red);
}

/* 起点 */
.about-origin-grid {
  display: grid;
  gap: 22px;
}

.about-origin-text p {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--about-soft);
}

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

.about-principles {
  margin: 6px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.about-principle {
  display: grid;
  gap: 8px;
  align-content: start;
  padding: 20px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--about-line);
  background: var(--paper);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.about-principle:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-1);
  border-color: rgba(242, 107, 58, 0.4);
}

.about-principle-letter {
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.about-principle h3 {
  margin: 0;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  color: var(--sea);
}

.about-principle p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-soft);
}

/* 服务网络 */
.about-network-grid {
  display: grid;
  gap: 26px;
}

.about-map img {
  box-shadow: var(--shadow-1);
}

.about-groups-intro {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-soft);
}

.about-group-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  border-top: 1px solid var(--about-line);
}

.about-group {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 3px 12px;
  padding: 13px 10px;
  border-bottom: 1px solid var(--about-line);
  border-radius: var(--radius-sm);
  transition: background 0.18s ease;
}

.about-group:hover,
.about-group:focus-within {
  background: rgba(232, 214, 179, 0.42);
}

.about-group-num {
  grid-row: 1;
  font-family: var(--font-num);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--orange);
  padding-top: 3px;
}

.about-group-name {
  grid-row: 1;
  font-family: var(--font-head);
  font-size: 15.5px;
  font-weight: 700;
  color: var(--sea);
}

.about-group-desc {
  grid-column: 2;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--slate);
}

.about-groups-more {
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate);
}

/* 师傅档案 */
.about-crew-grid {
  display: grid;
  gap: 22px;
}

.about-file {
  border: 1px solid var(--about-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--paper);
}

.about-file-head {
  display: grid;
  grid-template-columns: minmax(0, 0.42fr) minmax(0, 1fr);
  gap: 12px;
  padding: 12px 16px;
  background: var(--sand);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--sea);
}

.about-file-row {
  display: grid;
  grid-template-columns: minmax(0, 0.42fr) minmax(0, 1fr);
  gap: 12px;
  padding: 14px 16px;
  border-top: 1px solid var(--about-line);
  transition: background 0.18s ease;
}

.about-file-row:hover {
  background: rgba(247, 241, 231, 0.85);
}

.about-file-key {
  font-family: var(--font-head);
  font-size: 14.5px;
  font-weight: 700;
  color: var(--sea);
}

.about-file-desc {
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-soft);
}

.about-crew-note {
  margin: 0;
  padding: 16px 18px;
  border-left: 3px solid var(--celadon);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: rgba(111, 175, 159, 0.12);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink);
}

/* 时间轴 */
.about-history {
  padding: clamp(20px, 3.4vw, 38px);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(232, 214, 179, 0.5), rgba(232, 214, 179, 0.12));
}

.about-timeline {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
}

.about-step {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 8px;
  border-top: 1px solid rgba(15, 59, 92, 0.16);
  border-radius: var(--radius-sm);
  transition: background 0.18s ease;
}

.about-step:first-child {
  border-top: 0;
}

.about-step:hover,
.about-step:focus-within {
  background: rgba(255, 253, 248, 0.85);
}

.about-step-year {
  font-family: var(--font-num);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--orange-deep);
  padding-top: 2px;
}

.about-step h3 {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 16.5px;
  font-weight: 700;
  color: var(--sea);
}

.about-step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--about-soft);
}

/* 合作生态 */
.about-partners-lede {
  margin: 0;
  max-width: 52em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-soft);
}

.about-eco {
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.about-eco-item {
  display: grid;
  gap: 8px;
  align-content: start;
  padding: 20px 18px;
  border-radius: var(--radius-md);
  background: var(--paper);
  border: 1px solid var(--about-line);
  border-top: 3px solid var(--sand);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.about-eco-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-1);
  border-top-color: var(--orange);
}

.about-eco-item h3 {
  margin: 0;
  font-family: var(--font-head);
  font-size: 16.5px;
  font-weight: 700;
  color: var(--sea);
}

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

/* 数据 */
.about-numbers {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.about-num-cell {
  display: grid;
  gap: 4px;
  padding: 18px 16px 16px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(15, 59, 92, 0.1);
  background: linear-gradient(180deg, rgba(232, 214, 179, 0.55), var(--paper) 62%);
}

.about-num-value {
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(25px, 3.6vw, 34px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--sea);
}

.about-num-unit {
  margin-left: 3px;
  font-size: 14px;
  font-weight: 600;
  color: var(--orange);
}

.about-num-label {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate);
}

.about-revisit {
  padding: 20px 18px;
  border-radius: var(--radius-md);
  background: rgba(15, 59, 92, 0.05);
  border-left: 3px solid var(--sea);
}

.about-revisit h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  color: var(--sea);
}

.about-revisit p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--about-soft);
}

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

/* 结尾 */
.about-cta {
  padding: clamp(24px, 4vw, 44px);
  border-radius: var(--radius-lg);
  background: linear-gradient(124deg, var(--sea) 0%, var(--sea-deep) 100%);
  color: var(--paper);
  gap: 16px;
}

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

.about-cta p {
  margin: 0;
  max-width: 48em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(255, 253, 248, 0.78);
}

.about-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}

.about-cta .btn--ghost {
  border-color: rgba(255, 253, 248, 0.5);
  color: var(--paper);
}

.about-cta .btn--ghost:hover,
.about-cta .btn--ghost:focus-visible {
  border-color: var(--paper);
  background: rgba(255, 253, 248, 0.12);
}

.page-about a:focus-visible,
.page-about .about-group:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: 3px;
}

/* 平板与桌面 */
@media (min-width: 640px) {
  .about-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .about-numbers {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (min-width: 860px) {
  .about-hero {
    grid-template-columns: minmax(0, 1.45fr) minmax(260px, 0.85fr);
    align-items: end;
    gap: 34px;
  }

  .about-origin-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 1fr);
    align-items: start;
    gap: 36px;
  }

  .about-crew-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
    gap: 32px;
  }

  .about-step {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 26px;
    padding: 22px 12px;
  }

  .about-step-year {
    font-size: 21px;
  }

  .about-eco {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }

  .about-eco-item {
    grid-column: span 2;
  }

  .about-eco-item:nth-child(3) {
    grid-column: 2 / span 2;
  }
}

@media (min-width: 960px) {
  .about-network-grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: start;
    gap: 38px;
  }
}

@media (min-width: 1024px) {
  .page-about {
    max-width: 1440px;
    padding-left: calc(var(--rail-w) + var(--rail-gap) * 2);
    padding-right: clamp(24px, 3vw, 56px);
    padding-top: calc(var(--topbar-h) + 36px);
  }
}

@media (max-width: 560px) {
  .about-file-head {
    display: none;
  }

  .about-file-row {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .about-step {
    grid-template-columns: 62px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-principle,
  .page-about .about-eco-item,
  .page-about .about-group,
  .page-about .about-step,
  .page-about .about-file-row {
    transition: none;
  }

  .page-about .about-principle:hover,
  .page-about .about-eco-item:hover {
    transform: none;
  }
}