/* ================= 品牌自述页 ================= */
.page-about {
  --about-axis: 72px;
  --about-em: clamp(1.6rem, 3.6vw, 2.4rem);
  display: block;
}

.page-about [id^="grade-"] {
  scroll-margin-top: 108px;
}

/* ---------- 首屏 ---------- */
.page-about .about-head .breadcrumbs {
  margin-bottom: clamp(20px, 3.4vw, 38px);
}

.page-about .about-head__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-head__lede > .display {
  margin: 14px 0 clamp(18px, 2.6vw, 28px);
}

.page-about .about-head__lede .prose {
  max-width: 42ch;
}

.page-about .about-head__aside {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mute);
  max-width: 44ch;
}

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

.page-about .fact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .fact-list > li {
  background: var(--paper);
  padding: clamp(16px, 2.4vw, 24px);
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

.page-about .fact-key {
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--mute);
  line-height: 1.4;
}

.page-about .fact-val {
  font-family: var(--mono);
  font-size: var(--about-em);
  font-weight: 600;
  line-height: 1;
  color: var(--ink);
  letter-spacing: -.01em;
}

.page-about .fact-val em {
  font-style: normal;
  font-family: var(--sans);
  font-size: .4em;
  font-weight: 400;
  letter-spacing: .08em;
  color: var(--mute);
  margin-left: .6em;
}

/* ---------- 时间轴 ---------- */
.page-about .story-band {
  margin: clamp(24px, 4vw, 44px) 0 clamp(30px, 4.5vw, 52px);
  border: 1px solid var(--line);
}

.page-about .story-band img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .story-band figcaption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--mute);
  border-top: 1px solid var(--line);
}

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

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, rgba(225, 120, 31, .1), var(--amber) 45%, var(--amber-deep));
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 clamp(24px, 3.6vw, 38px) 46px;
  min-width: 0;
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--amber);
  z-index: 1;
}

.page-about .tl-year {
  margin: 0;
  font-family: var(--mono);
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: .01em;
  color: var(--ink);
  transform-origin: left center;
  transition: transform .35s var(--ease), color .35s var(--ease);
}

.page-about .tl-item:hover .tl-year {
  color: var(--amber-deep);
  transform: scale(1.12);
}

.page-about .tl-item h3 {
  margin: 12px 0 8px;
  font-size: var(--fs-h3);
  font-weight: 700;
  line-height: 1.35;
}

.page-about .tl-item p {
  margin: 0;
  max-width: 46ch;
  font-size: 15.5px;
  line-height: 1.8;
}

/* ---------- 工龄分级 ---------- */
.page-about .grades-intro {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.6vw, 44px);
  margin-bottom: clamp(34px, 5vw, 64px);
}

.page-about .grades-intro h2 {
  margin: 12px 0 16px;
}

.page-about .grades-intro .prose {
  max-width: 48ch;
}

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

.page-about .grade-track {
  position: relative;
}

.page-about .grade-track::before {
  content: "";
  position: absolute;
  left: calc(var(--about-axis) / 2 - 1px);
  top: 22px;
  bottom: 22px;
  width: 2px;
  background: linear-gradient(180deg, var(--sand), var(--amber) 58%, var(--amber-deep));
}

.page-about .grade-row {
  display: grid;
  grid-template-columns: var(--about-axis) minmax(0, 1fr);
  padding-bottom: clamp(14px, 2.2vw, 22px);
}

.page-about .grade-rail {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding-top: 6px;
}

.page-about .grade-node {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--paper);
  border: 2px solid var(--sand);
  color: var(--mute);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .04em;
  text-decoration: none;
  box-shadow: 0 0 0 4px var(--paper), 0 0 0 5px var(--line);
  position: relative;
  z-index: 1;
  transition: transform .3s var(--ease), border-color .3s var(--ease), color .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .grade-node:hover {
  transform: translateY(-2px);
}

.page-about .grade-node--amber {
  border-color: var(--amber);
  color: var(--amber-deep);
  box-shadow: 0 0 0 4px var(--paper), 0 0 0 5px rgba(225, 120, 31, .34);
}

.page-about .grade-node--solid {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--paper);
  box-shadow: 0 0 0 4px var(--paper), 0 0 0 6px rgba(225, 120, 31, .5);
}

.page-about .grade-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 3px solid var(--sand);
  padding: clamp(16px, 2.2vw, 24px) clamp(18px, 2.4vw, 28px);
  min-width: 0;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}

.page-about .grade-row:hover .grade-card {
  transform: translateY(-2px);
  box-shadow: var(--shadow-paper);
}

.page-about .grade-row--amber .grade-card {
  border-left-color: var(--amber);
}

.page-about .grade-row--solid .grade-card {
  border-left-color: var(--amber-deep);
  background: linear-gradient(120deg, rgba(242, 180, 90, .16), var(--paper) 62%);
}

.page-about .grade-row:target .grade-card {
  border-color: var(--amber);
  box-shadow: var(--shadow-paper);
}

.page-about .grade-card__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .grade-card__head h3 {
  margin: 0;
  font-size: var(--fs-h3);
  font-weight: 700;
  line-height: 1.3;
}

.page-about .grade-years {
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--mute);
}

.page-about .grade-card > p {
  margin: 10px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .grade-scope {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .grade-scope li {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  padding: 5px 10px;
  border: 1px solid var(--line);
  background: var(--sand);
  color: var(--ink-2);
}

.page-about .grade-row--amber .grade-scope li {
  background: rgba(225, 120, 31, .12);
  border-color: rgba(225, 120, 31, .32);
  color: var(--amber-deep);
}

.page-about .grades-foot {
  margin: clamp(28px, 4vw, 44px) 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mute);
  max-width: 60ch;
}

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

/* ---------- 培训 ---------- */
.page-about .training-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .training-copy h2 {
  margin: 12px 0 16px;
}

.page-about .training-copy .prose {
  max-width: 48ch;
}

.page-about .training-copy .data-list {
  margin-top: clamp(20px, 3vw, 30px);
}

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

.page-about .promote-strip {
  margin-top: clamp(34px, 5vw, 60px);
  padding: clamp(22px, 3.2vw, 34px);
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
  background: linear-gradient(120deg, rgba(242, 180, 90, .2), rgba(246, 241, 231, 0) 66%);
}

.page-about .promote-strip h3 {
  margin: 0 0 10px;
  font-size: var(--fs-h3);
  font-weight: 700;
}

.page-about .promote-strip p {
  margin: 0;
  max-width: 74ch;
  font-size: 15.5px;
  line-height: 1.85;
}

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

/* ---------- 质检与评价 ---------- */
.page-about .quality-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 4.5vw, 64px);
}

.page-about .quality-copy h2 {
  margin: 12px 0 16px;
}

.page-about .quality-copy .prose {
  max-width: 62ch;
}

.page-about .quality-copy .prose p {
  color: rgba(246, 241, 231, .86);
}

.page-about .quality-link {
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .stamp-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .stamp {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 22px 10px;
  text-align: center;
  border: 3px double rgba(242, 180, 90, .5);
  color: var(--amber-gold);
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: .12em;
  transition: border-color .3s var(--ease), color .3s var(--ease), background-color .3s var(--ease);
}

.page-about .stamp:hover {
  border-color: var(--amber-gold);
  color: var(--ink);
  background: var(--amber-gold);
}

.page-about .quality-figures {
  margin-top: clamp(20px, 3vw, 30px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-paper);
  border: 1px solid var(--line-paper);
}

.page-about .qf {
  background: var(--ink);
  padding: 18px 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
}

.page-about .qf-num {
  font-family: var(--mono);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 600;
  line-height: 1;
  color: var(--amber-gold);
}

.page-about .qf-num em {
  font-style: normal;
  font-family: var(--sans);
  font-size: .42em;
  color: rgba(246, 241, 231, .58);
  margin-left: .45em;
}

.page-about .qf-label {
  font-size: 13px;
  line-height: 1.65;
  color: rgba(246, 241, 231, .72);
}

/* ---------- 城市网络 ---------- */
.page-about .network-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .network-note {
  margin: clamp(18px, 2.6vw, 24px) 0 0;
  max-width: 48ch;
  font-size: 14.5px;
  line-height: 1.85;
}

.page-about .network-cta {
  margin: clamp(18px, 2.6vw, 24px) 0 0;
}

.page-about .network-map {
  margin: 0;
  min-width: 0;
}

.page-about .dotgrid {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: var(--paper);
}

.page-about .network-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 14px;
  font-size: 13px;
  color: var(--mute);
}

.page-about .lg {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .lg-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--sand);
}

.page-about .lg-dot--night {
  background: var(--night);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-head__grid {
    gap: clamp(30px, 4vw, 56px);
  }
}

@media (min-width: 900px) {
  .page-about .about-head__grid {
    grid-template-columns: 5fr 7fr;
    gap: clamp(40px, 6vw, 96px);
    align-items: start;
  }

  .page-about .grades-intro {
    grid-template-columns: 7fr 4fr;
    align-items: center;
    gap: clamp(44px, 6vw, 88px);
  }

  .page-about .training-grid {
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: clamp(40px, 5vw, 76px);
  }

  .page-about .quality-grid {
    grid-template-columns: 7fr 5fr;
    align-items: start;
    gap: clamp(44px, 5.5vw, 84px);
  }

  .page-about .network-grid {
    grid-template-columns: 5fr 7fr;
    align-items: center;
    gap: clamp(44px, 5.5vw, 80px);
  }
}

@media (min-width: 940px) {
  .page-about .timeline {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: clamp(48px, 8vw, 120px);
  }

  .page-about .timeline::before {
    left: 50%;
    top: 0;
    bottom: 0;
    transform: translateX(-1px);
    background: linear-gradient(180deg, rgba(225, 120, 31, .12), var(--amber));
  }

  .page-about .tl-item {
    padding: 0 0 clamp(30px, 4vw, 44px);
  }

  .page-about .tl-item:nth-child(odd) {
    grid-column: 1;
  }

  .page-about .tl-item:nth-child(even) {
    grid-column: 2;
    padding-top: clamp(30px, 4.4vw, 56px);
  }

  .page-about .tl-item::before {
    display: none;
  }

  .page-about .tl-item p {
    max-width: 40ch;
  }
}

@media (max-width: 420px) {
  .page-about {
    --about-axis: 58px;
  }

  .page-about .grade-node {
    width: 36px;
    height: 36px;
    font-size: 10px;
    box-shadow: 0 0 0 3px var(--paper), 0 0 0 4px var(--line);
  }

  .page-about .grade-track::before {
    left: calc(var(--about-axis) / 2 - 1px);
    top: 18px;
    bottom: 18px;
  }

  .page-about .grade-row {
    grid-template-columns: var(--about-axis) minmax(0, 1fr);
  }

  .page-about .fact-list {
    grid-template-columns: 1fr;
  }

  .page-about .stamp-list {
    grid-template-columns: 1fr;
  }

  .page-about .quality-figures {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: .001ms !important;
    animation-duration: .001ms !important;
  }

  .page-about .tl-item:hover .tl-year {
    transform: none;
  }

  .page-about .grade-node:hover,
  .page-about .grade-row:hover .grade-card {
    transform: none;
  }
}