.page-about {
  --about-rail: 108px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  padding: calc(var(--bar-h) + clamp(18px, 3vw, 40px)) var(--pad) clamp(40px, 6vw, 88px);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  margin-bottom: clamp(16px, 2.4vw, 28px);
}

/* 首屏框景 */
.page-about .about-hero {
  position: relative;
  border: 1px solid var(--mint);
  border-radius: var(--radius);
  padding: clamp(22px, 4vw, 52px) clamp(20px, 3.6vw, 48px);
  background: linear-gradient(160deg, var(--paper) 0%, var(--paper) 58%, var(--mint) 190%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 12px;
  background-image: repeating-linear-gradient(90deg, var(--green-500) 0 1px, transparent 1px 16px);
  opacity: 0.45;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -70px;
  top: -70px;
  width: 210px;
  height: 210px;
  border-radius: 46% 54% 62% 38% / 52% 41% 59% 48%;
  background: var(--sand);
  opacity: 0.75;
  pointer-events: none;
}

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

.page-about .about-hero h1 {
  margin: 14px 0 18px;
  font-size: clamp(34px, 6.6vw, 74px);
  line-height: 1.04;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--green-900);
}

.page-about .about-hero__lead {
  max-width: 46ch;
  margin: 0;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.9;
  color: var(--ink);
}

.page-about .about-hero__aside {
  display: flex;
  gap: 10px;
  margin: 24px 0 0;
  padding-left: 10px;
  border-left: 3px solid var(--orange);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--green-700);
}

@media (min-width: 860px) {
  .page-about .about-hero {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: clamp(20px, 3vw, 48px);
  }
  .page-about .about-hero__aside {
    flex-direction: column;
    writing-mode: vertical-rl;
    margin: 0;
    padding: 10px 0 0;
    border-left: 0;
    border-top: 3px solid var(--orange);
    letter-spacing: 0.26em;
    align-self: end;
  }
}

/* 双栏骨架 */
.page-about .about-layout {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(28px, 4.5vw, 64px);
}

.page-about .about-body {
  min-width: 0;
  display: grid;
  gap: clamp(34px, 5vw, 76px);
}

/* 年份索引轨道 */
.page-about .year-rail {
  order: -1;
}

.page-about .year-rail__title {
  margin: 0 0 10px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--green-500);
}

.page-about .year-rail__list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
}

.page-about .year-rail__list a {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 74px;
  padding: 8px 10px;
  border-left: 2px solid var(--mint);
  color: var(--green-900);
  text-decoration: none;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .year-rail__list a:hover,
.page-about .year-rail__list a:focus-visible {
  border-left-color: var(--orange);
  background: var(--mint);
}

.page-about .year-rail__year {
  font-size: 20px;
  font-weight: 900;
  line-height: 1;
}

.page-about .year-rail__label {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--green-500);
}

@media (min-width: 1200px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(24px, 3.4vw, 56px);
  }
  .page-about .year-rail {
    position: sticky;
    top: calc(var(--bar-h) + 24px);
    align-self: start;
  }
  .page-about .year-rail__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .year-rail__list a {
    min-width: 0;
    padding: 10px 8px 10px 12px;
  }
}

/* 章节通用 */
.page-about .about-section__head {
  max-width: 60ch;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .about-section h2,
.page-about .rhythm h2,
.page-about .about-region h2 {
  margin: 10px 0 12px;
  font-size: clamp(24px, 3.6vw, 42px);
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--green-900);
}

.page-about .about-section__lead,
.page-about .rhythm__lead,
.page-about .team__text > p {
  margin: 0;
  max-width: 54ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.9;
}

/* 时间线 */
.page-about .timeline {
  display: grid;
  gap: clamp(18px, 2.4vw, 26px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline__item {
  position: relative;
  padding-top: 24px;
  border-top: 2px solid var(--mint);
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--orange);
}

.page-about .timeline__year {
  display: block;
  font-size: clamp(40px, 6vw, 64px);
  line-height: 0.95;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--green-700);
}

.page-about .timeline__item h3 {
  margin: 10px 0 8px;
  font-size: clamp(17px, 1.8vw, 20px);
  font-weight: 800;
  color: var(--green-900);
}

.page-about .timeline__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
}

@media (min-width: 860px) {
  .page-about .timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(18px, 2.4vw, 30px);
  }
  .page-about .timeline__item:nth-child(2) {
    margin-top: 26px;
  }
  .page-about .timeline__item:nth-child(3) {
    margin-top: 52px;
  }
}

/* 图片 */
.page-about .about-figure {
  margin: clamp(26px, 4vw, 46px) 0 0;
}

.page-about .about-figure img,
.page-about .team__figure img,
.page-about .about-band img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  object-fit: cover;
}

.page-about .about-figure img {
  background: var(--mint);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--green-700);
}

/* 路径收束 */
.page-about .converge {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  align-items: start;
}

.page-about .converge__text p {
  max-width: 52ch;
  font-size: 15.5px;
  line-height: 1.9;
}

.page-about .converge__steps {
  margin: clamp(20px, 2.6vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.page-about .converge__steps li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.page-about .converge__no {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--orange);
  color: var(--ink);
  font-weight: 900;
  font-size: 16px;
}

.page-about .converge__steps h3 {
  margin: 4px 0 4px;
  font-size: 16px;
  font-weight: 800;
  color: var(--green-900);
}

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

.page-about .converge__diagram {
  padding: clamp(14px, 2vw, 24px);
  border-radius: var(--radius);
  background: var(--green-900);
}

.page-about .converge__diagram svg {
  display: block;
  width: 100%;
  height: auto;
}

@media (min-width: 900px) {
  .page-about .converge {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: center;
  }
}

/* 服务原则 */
.page-about .principles__grid {
  display: grid;
  gap: clamp(14px, 2vw, 22px);
}

.page-about .principle {
  padding: clamp(18px, 2.4vw, 28px);
  border: 1px solid var(--mint);
  border-left: 4px solid var(--green-500);
  border-radius: var(--radius);
  background: var(--paper);
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .principle:hover,
.page-about .principle:focus,
.page-about .principle:focus-within {
  border-left-color: var(--orange);
  background: var(--mint);
  transform: translateY(-2px);
  outline: none;
}

.page-about .principle:focus-visible {
  box-shadow: 0 0 0 3px var(--focus);
}

.page-about .principle__no {
  display: block;
  font-size: 42px;
  line-height: 1;
  font-weight: 900;
  color: var(--orange);
  margin-bottom: 8px;
}

.page-about .principle h3 {
  margin: 0 0 6px;
  font-size: 19px;
  font-weight: 800;
  color: var(--green-900);
}

.page-about .principle__brief {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
}

.page-about .principle__more {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--green-900);
}

@media (min-width: 760px) {
  .page-about .principles__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }
  .page-about .principle:nth-child(2) {
    margin-top: 20px;
  }
  .page-about .principle:nth-child(3) {
    margin-top: 40px;
  }
}

@media (hover: hover) and (min-width: 760px) {
  .page-about .principle__more {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    transition: max-height 0.24s var(--ease), opacity 0.2s var(--ease), margin-top 0.24s var(--ease);
  }
  .page-about .principle:hover .principle__more,
  .page-about .principle:focus .principle__more,
  .page-about .principle:focus-within .principle__more {
    max-height: 220px;
    opacity: 1;
    margin-top: 10px;
  }
}

/* 公路氛围带 */
.page-about .about-band {
  position: relative;
  margin: 0;
}

.page-about .about-band img {
  filter: saturate(0.72);
  min-height: 180px;
}

.page-about .about-band__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 10px 16px;
  background: var(--paper);
  border-left: 4px solid var(--orange);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--green-900);
}

/* 维护节奏 */
.page-about .rhythm {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 52px);
  border-radius: var(--radius);
  background: var(--sand);
}

.page-about .rhythm::after {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -90px;
  width: 240px;
  height: 240px;
  border-radius: 46% 54% 62% 38% / 52% 41% 59% 48%;
  background: var(--mint);
  opacity: 0.7;
  pointer-events: none;
}

.page-about .rhythm > * {
  position: relative;
  z-index: 1;
}

.page-about .rhythm__lead {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .rhythm__list {
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .rhythm__item {
  padding-top: 14px;
  border-top: 3px solid var(--green-700);
}

.page-about .rhythm__tag {
  display: block;
  margin-bottom: 8px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.2em;
  color: var(--green-900);
}

.page-about .rhythm__item h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 800;
  color: var(--green-900);
}

.page-about .rhythm__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
}

@media (min-width: 800px) {
  .page-about .rhythm__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* 团队 */
.page-about .team {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  align-items: center;
}

.page-about .team__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: clamp(18px, 2.4vw, 26px) 0 0;
}

.page-about .team__stat {
  flex: 1 1 120px;
  padding: 14px 16px;
  border-left: 3px solid var(--green-500);
  background: var(--mint);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-about .team__stat dt {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--green-900);
}

.page-about .team__stat dd {
  margin: 6px 0 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .team__stat .numeral {
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1;
  font-weight: 900;
  color: var(--green-700);
  margin-right: 4px;
}

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

@media (min-width: 880px) {
  .page-about .team {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  }
}

/* 地区与联系 */
.page-about .about-region {
  padding-top: clamp(20px, 3vw, 30px);
  border-top: 3px solid var(--green-900);
}

.page-about .region__grid {
  display: grid;
  gap: clamp(18px, 2.6vw, 32px);
}

.page-about .region__facts p {
  margin: 0 0 10px;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
}

.page-about .region__contact {
  margin: 0;
  padding: 20px;
  border-radius: var(--radius);
  background: var(--green-900);
  color: var(--paper);
}

.page-about .region__contact dt {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--mint);
}

.page-about .region__contact dd {
  margin: 4px 0 14px;
  font-size: 15px;
  line-height: 1.7;
  word-break: break-word;
}

.page-about .region__contact dd:last-child {
  margin-bottom: 0;
}

.page-about .region__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 2.6vw, 28px);
}

@media (min-width: 820px) {
  .page-about .region__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .principle,
  .page-about .year-rail__list a {
    transition: none;
  }
  .page-about .principle:hover,
  .page-about .principle:focus,
  .page-about .principle:focus-within {
    transform: none;
  }
}