.page-about {
  --about-index-w: 236px;
  --about-rule: 1px solid var(--line);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ── 封面 ───────────────────────────── */
.page-about .about-cover {
  padding-top: clamp(18px, 4vw, 40px);
  padding-bottom: clamp(30px, 5vw, 64px);
}

.page-about .about-cover .eyebrow {
  margin-top: clamp(16px, 3vw, 32px);
  font-family: var(--font-narrow);
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about h1 {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(31px, 6.2vw, 70px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--ink);
  margin: 0.22em 0 0.4em;
  max-width: 17ch;
}

.page-about .about-cover .lede {
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.8;
  color: var(--ink);
  max-width: 34em;
  margin: 0;
}

.page-about .about-figures {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: var(--about-rule);
}

.page-about .about-figures li {
  background: var(--paper);
  padding: clamp(14px, 2.4vw, 24px) clamp(14px, 2.4vw, 22px);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .figure-num {
  font-family: var(--font-narrow);
  font-size: clamp(36px, 7vw, 62px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--deep);
  font-variant-numeric: tabular-nums;
}

.page-about .about-figures li:nth-child(3) .figure-num {
  color: var(--gold);
}

.page-about .figure-label {
  font-size: 13.5px;
  letter-spacing: 0.06em;
  color: var(--mid);
}

/* ── 主体分栏 ───────────────────────── */
.page-about .about-body {
  padding-bottom: clamp(54px, 8vw, 110px);
}

.page-about .about-index {
  border-top: 2px solid var(--deep);
  padding-top: 14px;
  margin-bottom: clamp(30px, 5vw, 46px);
}

.page-about .about-index__title {
  font-family: var(--font-narrow);
  font-size: 12.5px;
  letter-spacing: 0.16em;
  color: var(--mid);
  margin: 0 0 10px;
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-index__list a {
  position: relative;
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 9px 0 9px 14px;
  font-size: 15px;
  line-height: 1.45;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-index__list a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 2px;
  height: 0;
  background: var(--gold);
  transform: translateY(-50%);
  transition: height var(--dur) var(--ease);
}

.page-about .about-index__list a:hover::before,
.page-about .about-index__list a:focus-visible::before {
  height: 58%;
}

.page-about .about-index__num {
  flex: none;
  font-family: var(--font-narrow);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .about-index__note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--mid);
}

.page-about .about-index__note a {
  color: var(--coral-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ── 区块通用 ───────────────────────── */
.page-about .about-block {
  padding: clamp(28px, 4.5vw, 56px) 0;
  border-top: var(--about-rule);
}

.page-about .about-block:first-child {
  border-top: none;
  padding-top: 0;
}

.page-about .about-block__num {
  font-family: var(--font-narrow);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--coral-deep);
  margin: 0 0 8px;
  font-variant-numeric: tabular-nums;
}

.page-about .about-block h2 {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(23px, 3.6vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0 0 16px;
  max-width: 22ch;
}

.page-about .about-block__lede {
  font-family: var(--font-serif);
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--ink);
  max-width: 34em;
  margin: 0 0 clamp(20px, 3vw, 32px);
}

.page-about .img-caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mid);
}

.page-about .about-figure {
  margin: 0 0 clamp(22px, 3vw, 32px);
}

/* ── 事实清单 ───────────────────────── */
.page-about .fact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .fact-list li {
  position: relative;
  padding: 15px 0 15px 24px;
  border-bottom: 1px solid var(--line-soft);
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .fact-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 26px;
  width: 12px;
  height: 1px;
  background: var(--gold);
}

.page-about .fact-list strong {
  font-weight: 700;
  color: var(--deep);
}

.page-about .fact-list strong::after {
  content: "｜";
  margin: 0 6px;
  font-weight: 400;
  color: var(--gold);
}

/* ── 业态分段切换 ───────────────────── */
.page-about .about-tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 20px;
}

.page-about .about-tabs__tab {
  appearance: none;
  background: transparent;
  border: 1px solid var(--line);
  border-bottom: none;
  padding: 10px 20px;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 700;
  color: var(--mid);
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-tabs__tab:hover,
.page-about .about-tabs__tab:focus-visible {
  color: var(--coral-deep);
  border-color: var(--coral);
}

.page-about .about-tabs__tab[aria-selected="true"] {
  background: var(--deep);
  border-color: var(--deep);
  color: var(--paper);
}

.page-about .about-tabs__panel {
  background: var(--mint);
  padding: clamp(18px, 3vw, 30px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .about-tabs__panel[hidden] {
  display: none;
}

.page-about .about-tabs__panel h3 {
  font-family: var(--font-sans);
  font-size: 18px;
  font-weight: 900;
  line-height: 1.4;
  color: var(--deep);
  margin: 0 0 8px;
}

.page-about .about-tabs__panel p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 34em;
}

/* ── 导视 ───────────────────────────── */
.page-about .way-intro {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
  margin-bottom: clamp(20px, 3vw, 28px);
}

.page-about .way-intro .about-block__lede {
  margin: 0;
}

.page-about .way-photo {
  margin: 0;
}

.page-about .way-graph {
  display: block;
  width: 100%;
  height: auto;
  margin: 0 0 clamp(16px, 2.5vw, 24px);
}

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

.page-about .way-item {
  border-bottom: 1px solid var(--line);
}

.page-about .way-item summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

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

.page-about .way-item summary::after {
  content: "+";
  margin-left: auto;
  padding-left: 12px;
  font-family: var(--font-narrow);
  font-size: 20px;
  line-height: 1;
  color: var(--gold);
}

.page-about .way-item details[open] summary::after {
  content: "−";
  color: var(--coral-deep);
}

.page-about .way-num {
  flex: none;
  font-family: var(--font-narrow);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .way-item p {
  margin: 0 0 16px;
  padding-left: 34px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 36em;
}

.page-about .way-note {
  margin: 16px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--gold);
  font-size: 14px;
  line-height: 1.8;
  color: var(--mid);
  max-width: 34em;
}

/* ── 团队 ───────────────────────────── */
.page-about .team-grid {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
}

.page-about .team-photo {
  margin: 0;
}

.page-about .team-text .about-block__lede {
  margin-bottom: 20px;
}

.page-about .team-data {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: var(--about-rule);
}

.page-about .team-data li {
  background: var(--paper);
  padding: 14px 16px;
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .team-data__num {
  font-family: var(--font-narrow);
  font-size: 30px;
  font-weight: 600;
  line-height: 1;
  color: var(--deep);
  font-variant-numeric: tabular-nums;
}

.page-about .team-data__label {
  font-size: 14px;
  line-height: 1.5;
  color: var(--mid);
}

.page-about .team-text > p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 34em;
}

/* ── 版本演进 ───────────────────────── */
.page-about .version-strip {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .version-card {
  position: relative;
  background: var(--gold-sand);
  padding: clamp(20px, 3vw, 26px) clamp(18px, 3vw, 24px) clamp(24px, 3vw, 30px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .version-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: var(--gold);
}

.page-about .version-card--v4 {
  background: var(--deep);
  color: var(--paper);
}

.page-about .version-card--v4::before {
  background: var(--coral);
}

.page-about .version-tag {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-narrow);
  font-size: 26px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--deep);
  margin: 0 0 6px;
}

.page-about .version-card--v4 .version-tag {
  color: var(--coral);
}

.page-about .version-badge {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 3px 8px;
  background: var(--coral);
  color: var(--paper);
}

.page-about .version-card h3 {
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 900;
  line-height: 1.4;
  margin: 0 0 8px;
}

.page-about .version-card p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mid);
}

.page-about .version-card--v4 p:last-child {
  color: var(--mint);
}

/* ── 本地服务 ───────────────────────── */
.page-about .local-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: var(--about-rule);
}

.page-about .local-card {
  background: var(--paper);
  padding: clamp(18px, 3vw, 26px);
}

.page-about .local-card--contact {
  background: var(--mint);
}

.page-about .local-card h3 {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 900;
  color: var(--deep);
  margin: 0 0 10px;
}

.page-about .local-card > p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 34em;
}

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

.page-about .local-contact li {
  display: grid;
  gap: 3px;
}

.page-about .local-contact span {
  font-family: var(--font-narrow);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .local-contact strong {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.65;
  color: var(--ink);
  overflow-wrap: anywhere;
}

/* ── 收束 ───────────────────────────── */
.page-about .reason-list {
  list-style: none;
  margin: 0 0 clamp(24px, 4vw, 40px);
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: var(--about-rule);
}

.page-about .reason-list li {
  background: var(--paper);
  padding: clamp(18px, 3vw, 26px);
}

.page-about .reason-list h3 {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 900;
  color: var(--deep);
  margin: 0 0 8px;
}

.page-about .reason-list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 34em;
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 16px;
  padding-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid var(--line);
}

.page-about .about-cta p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mid);
}

.page-about .about-cta p a {
  color: var(--coral-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ── 桌面栅格 ───────────────────────── */
@media (min-width: 1000px) {
  .page-about .about-body {
    display: grid;
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-offset) + 20px);
    margin-bottom: 0;
  }

  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .way-intro {
    grid-template-columns: minmax(0, 1fr) minmax(0, 400px);
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 320px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .team-data {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .team-data li {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .page-about .version-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .local-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  }

  .page-about .reason-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .way-item:nth-child(2) {
    padding-left: 48px;
  }

  .page-about .way-item:nth-child(3) {
    padding-left: 96px;
  }

  .page-about .way-item:nth-child(4) {
    padding-left: 144px;
  }

  .page-about .way-item:nth-child(5) {
    padding-left: 192px;
  }
}

@media (min-width: 1240px) {
  .page-about .about-block__head h2 {
    max-width: 24ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__list a::before,
  .page-about .about-tabs__tab {
    transition: none;
  }
}