.page-about {
  --about-railw: 168px;
  --about-hair: rgba(20, 98, 74, 0.55);
  background: var(--green-deep);
  color: var(--white);
  font-family: var(--font-body);
}

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

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding: 18px 0 6px;
  font-family: var(--font-mono);
  font-size: var(--step-cap);
  letter-spacing: 0.1em;
  color: var(--grey);
}

.page-about .about-crumbs a {
  color: var(--grey);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 90ms linear, border-color 90ms linear;
}

.page-about .about-crumbs a:hover {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

.page-about .about-crumbs .crumbs__sep {
  margin: 0 10px;
  color: var(--green-grass);
}

/* ---------- 首屏 ---------- */
.page-about .about-open {
  padding: 28px 0 52px;
  border-bottom: var(--border-w) solid var(--ink);
  background-image:
    repeating-linear-gradient(0deg, rgba(244, 248, 246, 0.055) 0 1px, transparent 1px 24px),
    repeating-linear-gradient(90deg, rgba(244, 248, 246, 0.055) 0 1px, transparent 1px 24px);
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-kicker__num {
  display: inline-block;
  padding: 3px 9px;
  background: var(--amber);
  color: var(--ink);
  font-weight: 700;
}

.page-about .about-h1 {
  margin: 0 0 26px;
  max-width: 17ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--step-h1);
  line-height: 1.14;
  letter-spacing: 0.04em;
}

.page-about .about-lede {
  margin: 0 0 8px;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(244, 248, 246, 0.9);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stat {
  padding: 16px 14px 18px;
  background: var(--green-mid);
  border: var(--border-w) solid var(--ink);
  box-shadow: var(--hard-shadow-sm);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--amber);
}

.page-about .about-stat__unit {
  display: block;
  margin-top: 10px;
  font-size: var(--step-cap);
  letter-spacing: 0.08em;
  color: var(--grey);
}

/* ---------- 外壳与索引 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  padding-top: 40px;
  padding-bottom: 72px;
}

.page-about .about-rail__cap {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--green-grass);
}

.page-about .about-index {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 11px;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--grey);
  text-decoration: none;
  border: 1px solid var(--green-grass);
  transition: color 90ms linear, border-color 90ms linear, background-color 90ms linear;
}

.page-about .about-index__link:hover {
  color: var(--white);
  border-color: var(--amber);
}

.page-about .about-index__num {
  color: var(--amber);
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding: 34px 0 38px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-body > .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 0 0 22px;
}

.page-about .about-sec__no {
  flex: none;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--ink);
  background: var(--amber);
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step-h2);
  line-height: 1.28;
  letter-spacing: 0.05em;
}

.page-about .about-body p {
  margin: 0 0 20px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(244, 248, 246, 0.9);
}

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

.page-about .about-body a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid var(--amber);
  transition: color 90ms linear, border-color 90ms linear;
}

.page-about .about-body a:hover {
  color: var(--white);
  border-bottom-color: var(--white);
}

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

.page-about .about-note {
  margin: 26px 0 0;
  padding-top: 14px;
  max-width: 62em;
  font-size: var(--step-cap);
  line-height: 1.8;
  letter-spacing: 0.02em;
  color: rgba(244, 248, 246, 0.7);
  border-top: 1px solid var(--about-hair);
}

.page-about .about-more {
  margin: 24px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 248, 246, 0.82);
}

/* ---------- 珠宝色章节 ---------- */
.page-about .about-sec--indigo,
.page-about .about-sec--wine {
  border: 0;
  border-left: 3px solid var(--amber);
  padding: 28px 20px 32px;
  margin: 10px 0 42px;
}

.page-about .about-sec--indigo {
  background: var(--indigo);
}

.page-about .about-sec--wine {
  background: var(--wine);
}

.page-about .about-sec--indigo .about-note,
.page-about .about-sec--wine .about-note {
  border-top-color: rgba(244, 248, 246, 0.28);
  color: rgba(244, 248, 246, 0.78);
}

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.page-about .about-split__text p {
  max-width: 32em;
}

.page-about .about-figure {
  margin: 0;
  background: var(--green-mid);
  border: var(--border-w) solid var(--ink);
  box-shadow: var(--hard-shadow);
}

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

.page-about .about-figure figcaption {
  padding: 11px 13px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--grey);
  border-top: 1px solid var(--green-grass);
}

/* ---------- 表格 ---------- */
.page-about .about-tablewrap {
  margin: 0 0 4px;
  overflow-x: auto;
  background: var(--green-deep);
  border: var(--border-w) solid var(--ink);
  box-shadow: var(--hard-shadow);
}

.page-about .about-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .about-table th {
  padding: 12px 14px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--white);
  background: var(--green-grass);
  border-bottom: 1px solid var(--ink);
}

.page-about .about-table td {
  padding: 14px;
  vertical-align: top;
  line-height: 1.75;
  color: rgba(244, 248, 246, 0.88);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-table tbody tr {
  transition: background-color 90ms linear;
}

.page-about .about-table tbody tr:hover {
  background: var(--green-mid);
}

.page-about .about-table .about-num {
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  color: var(--amber);
  white-space: nowrap;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 4px 0 0 26px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 16px;
  width: 3px;
  background: var(--amber);
}

.page-about .about-milestone {
  position: relative;
  padding-bottom: 22px;
}

.page-about .about-milestone::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 8px;
  width: 10px;
  height: 10px;
  background: var(--amber);
  border: 2px solid var(--ink);
}

.page-about .about-milestone summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-milestone summary::-webkit-details-marker {
  display: none;
}

.page-about .about-milestone summary::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--amber);
}

.page-about .about-milestone[open] summary::after {
  content: "－";
}

.page-about .about-year {
  flex: none;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--amber);
  border: 1px solid currentColor;
}

.page-about .about-milestone__title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--white);
}

.page-about .about-milestone__body {
  padding-top: 12px;
}

.page-about .about-milestone__body p {
  max-width: 32em;
  font-size: 15px;
  color: rgba(244, 248, 246, 0.88);
}

/* ---------- 全宽过渡图 ---------- */
.page-about .about-band {
  margin: 0 0 42px;
  overflow: hidden;
  border-top: var(--border-w) solid var(--ink);
  border-bottom: var(--border-w) solid var(--ink);
}

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

/* ---------- 服务地区 ---------- */
.page-about .about-region {
  position: relative;
  overflow: hidden;
  padding: 0;
  border: 0;
  border-top: var(--border-w) solid var(--ink);
  border-bottom: var(--border-w) solid var(--ink);
}

.page-about .about-region__img {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-region__veil {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: rgba(43, 42, 107, 0.88);
}

.page-about .about-region__inner {
  position: relative;
  z-index: 2;
  padding: 40px 20px 44px;
}

.page-about .about-region__inner p {
  max-width: 34em;
}

.page-about .about-partners {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 24px 0 22px;
  padding: 0;
  list-style: none;
}

.page-about .about-partners li {
  padding: 7px 13px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--amber);
  border: 1px solid var(--amber);
}

.page-about .about-region__act {
  margin: 0;
  font-size: 15px;
}

/* ---------- 理由 ---------- */
.page-about .about-reasons {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-reason {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 14px;
  padding: 18px;
  background: var(--green-mid);
  border: var(--border-w) solid var(--ink);
  box-shadow: var(--hard-shadow-sm);
}

.page-about .about-reason__no {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-reason__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--white);
}

.page-about .about-reason__text {
  grid-column: 2 / -1;
  margin: 0;
  max-width: 30em;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(244, 248, 246, 0.82);
}

/* ---------- 按钮 ---------- */
.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.page-about .about-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  text-decoration: none;
  border: var(--border-w) solid var(--ink);
  box-shadow: var(--hard-shadow-sm);
  transition: transform 90ms linear, box-shadow 90ms linear, background-color 90ms linear, color 90ms linear;
}

.page-about .about-btn--red {
  background: var(--score-red);
  color: var(--white);
}

.page-about .about-btn--ghost {
  background: transparent;
  color: var(--amber);
  border-color: var(--amber);
}

.page-about .about-btn:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--ink);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-reasons {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-region__inner {
    padding: 52px 32px 56px;
  }
}

@media (min-width: 860px) {
  .page-about .about-duo {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 40px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .about-sec--indigo,
  .page-about .about-sec--wine {
    padding: 34px 32px 38px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-railw) minmax(0, 1fr);
    gap: 56px;
    padding-top: 56px;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--topbar-h) + 32px);
    align-self: start;
  }

  .page-about .about-index {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-index__link {
    padding: 9px 0 9px 13px;
    border: 0;
    border-left: 3px solid transparent;
    white-space: normal;
    line-height: 1.5;
  }

  .page-about .about-index__link:hover {
    border-left-color: var(--green-grass);
  }

  .page-about .about-index__link[aria-current="location"] {
    color: var(--white);
    border-left-color: var(--amber);
  }

  .page-about .about-h1 {
    max-width: 15ch;
  }
}

@media (min-width: 1240px) {
  .page-about .about-open {
    padding-top: 40px;
    padding-bottom: 64px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-btn,
  .page-about .about-index__link,
  .page-about .about-table tbody tr,
  .page-about .about-crumbs a {
    transition: none;
  }

  .page-about .about-btn:hover {
    transform: none;
    box-shadow: var(--hard-shadow-sm);
  }
}