.page-about {
  --about-gap: clamp(20px, 3.4vw, 40px);
  --about-radius: 2px;
  display: block;
  overflow-x: clip;
  background: var(--mb-deep);
  color: var(--mb-snow);
}

.page-about .about-crumbs {
  padding: 20px 0 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 24px 0 clamp(28px, 5vw, 56px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-hero__title {
  margin: 10px 0 14px;
  letter-spacing: -0.02em;
  line-height: 1.12;
}

.page-about .about-hero__meta {
  margin: 16px 0 0;
  max-width: 60ch;
  color: var(--mb-kaolin);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

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

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px;
  background: var(--mb-cobalt);
}

.page-about .about-stat__num {
  font-family: var(--mb-font-mono);
  font-size: clamp(26px, 5vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--mb-cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--mb-glacier);
}

.page-about .about-hero__media {
  margin: var(--about-gap) 0 0;
  border: 2px solid var(--mb-ink);
  box-shadow: var(--mb-shadow-lg);
  background: linear-gradient(135deg, var(--mb-cobalt), var(--mb-violet));
}

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

/* ---------- 校准 ---------- */
.page-about .about-calib {
  border-top: 2px solid var(--mb-ink);
}

.page-about .about-calib__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  margin-top: 28px;
}

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

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  padding: 18px;
  background: var(--mb-cobalt);
  border: 2px solid var(--mb-ink);
  box-shadow: var(--mb-shadow);
}

.page-about .about-steps__num {
  font-family: var(--mb-font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--mb-cyan);
  line-height: 1;
}

.page-about .about-steps__body h3 {
  margin: 0 0 8px;
  color: var(--mb-snow);
}

.page-about .about-steps__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mb-glacier);
}

.page-about .about-calib__note {
  padding: 22px;
  background: var(--mb-snow);
  color: var(--mb-cobalt);
  border: 2px solid var(--mb-ink);
  box-shadow: var(--mb-shadow-lg);
}

.page-about .about-calib__notetitle {
  margin: 0 0 10px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mb-teal);
}

.page-about .about-calib__note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
}

.page-about .about-calib__facts {
  list-style: none;
  margin: 18px 0 0;
  padding: 16px 0 0;
  border-top: 2px solid var(--mb-glacier);
  display: grid;
  gap: 10px;
  font-size: 14px;
}

.page-about .about-calib__facts li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
}

.page-about .about-calib__facts .mb-data {
  color: var(--mb-teal);
  font-weight: 700;
}

/* ---------- 发展历程 ---------- */
.page-about .about-history__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  margin-top: 28px;
}

.page-about .about-history__media {
  margin: 0;
  border: 2px solid var(--mb-ink);
  box-shadow: var(--mb-shadow);
  background: linear-gradient(160deg, var(--mb-cobalt), var(--mb-deep));
}

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

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 8px;
  bottom: 8px;
  width: 3px;
  background: linear-gradient(180deg, var(--mb-green), var(--mb-cyan) 30%, var(--mb-violet) 58%, var(--mb-red) 78%, var(--mb-yellow));
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  grid-template-areas:
    "dot year"
    "dot card";
  gap: 4px 14px;
  padding-bottom: 22px;
}

.page-about .about-timeline__dot {
  grid-area: dot;
  justify-self: center;
  margin-top: 5px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--mb-cyan);
  border: 2px solid var(--mb-ink);
  position: relative;
  z-index: 1;
}

.page-about .about-timeline__dot--green { background: var(--mb-green); }
.page-about .about-timeline__dot--cyan { background: var(--mb-cyan); }
.page-about .about-timeline__dot--violet { background: var(--mb-violet); }
.page-about .about-timeline__dot--yellow { background: var(--mb-yellow); }

.page-about .about-timeline__year {
  grid-area: year;
  font-family: var(--mb-font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--mb-teal);
  padding-top: 2px;
}

.page-about .about-timeline__card {
  grid-area: card;
  background: #ffffff;
  border: 2px solid var(--mb-ink);
  box-shadow: var(--mb-shadow);
}

.page-about .about-timeline__summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  color: var(--mb-cobalt);
}

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

.page-about .about-timeline__stage {
  font-weight: 700;
  font-size: 16px;
  flex: 1 1 auto;
}

.page-about .about-timeline__chev {
  font-size: 18px;
  line-height: 1;
  color: var(--mb-teal);
  transition: transform 0.18s ease;
}

.page-about .about-timeline__card[open] .about-timeline__chev {
  transform: rotate(45deg);
}

.page-about .about-timeline__body {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mb-cobalt);
  border-top: 2px solid var(--mb-glacier);
  padding-top: 14px;
}

/* ---------- 团队 ---------- */
.page-about .about-teamline {
  border-top: 2px solid var(--mb-ink);
}

.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 28px;
}

.page-about .about-team__card {
  padding: 22px;
  background: var(--mb-cobalt);
  border: 2px solid var(--mb-ink);
  box-shadow: var(--mb-shadow);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.page-about .about-team__card--b {
  border-width: 3px;
  box-shadow: var(--mb-shadow-lg);
  background: linear-gradient(165deg, var(--mb-cobalt), var(--mb-deep));
}

.page-about .about-team__card--c {
  border-color: var(--mb-cyan);
}

.page-about .about-team__badge {
  display: inline-block;
  margin: 0 0 12px;
  padding: 4px 10px;
  font-family: var(--mb-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mb-ink);
  background: var(--mb-cyan);
  border: 2px solid var(--mb-ink);
}

.page-about .about-team__card--b .about-team__badge {
  background: var(--mb-yellow);
}

.page-about .about-team__card--c .about-team__badge {
  background: var(--mb-violet);
  color: var(--mb-snow);
}

.page-about .about-team__name {
  margin: 0 0 10px;
  color: var(--mb-snow);
}

.page-about .about-team__card p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mb-glacier);
}

.page-about .about-team__rhythm {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  padding-top: 14px;
  border-top: 2px solid rgba(143, 163, 184, 0.4);
  font-size: 13px;
  color: var(--mb-glacier);
  margin-bottom: 0 !important;
}

.page-about .about-team__rhythm .mb-data {
  color: var(--mb-cyan);
  font-weight: 700;
}

/* ---------- 信息来源 ---------- */
.page-about .about-source__body p {
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mb-glacier);
}

.page-about .about-source__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  margin-top: 28px;
}

.page-about .about-net__panel {
  padding: 18px;
  background: var(--mb-deep);
  border: 2px solid var(--mb-ink);
  box-shadow: var(--mb-shadow-lg);
}

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

.page-about .about-net__label {
  font-family: var(--mb-font-body);
  font-size: 13px;
  font-weight: 700;
  fill: var(--mb-glacier);
}

.page-about .about-net__link {
  stroke: var(--mb-kaolin);
  stroke-width: 1.6;
  opacity: 0.5;
  transition: stroke 0.15s ease, opacity 0.15s ease;
}

.page-about .about-net__node {
  fill: var(--mb-violet);
  stroke: var(--mb-ink);
  stroke-width: 1.5;
}

.page-about .about-net__node--media { fill: var(--mb-yellow); }
.page-about .about-net__node--data { fill: var(--mb-violet); }

.page-about .about-net__hub {
  fill: var(--mb-cyan);
  stroke: var(--mb-ink);
  stroke-width: 2.5;
}

.page-about .about-net__hubtext {
  font-family: var(--mb-font-body);
  font-size: 15px;
  font-weight: 900;
  fill: var(--mb-ink);
}

.page-about .about-net__caption {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mb-kaolin);
}

.page-about .about-source__media {
  margin: 0;
  border: 2px solid var(--mb-ink);
  box-shadow: var(--mb-shadow);
  background: linear-gradient(140deg, var(--mb-deep), var(--mb-violet));
}

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

/* ---------- 服务地区 ---------- */
.page-about .about-region__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 28px;
}

.page-about .about-region__card {
  padding: 20px;
  background: #ffffff;
  border: 2px solid var(--mb-ink);
  border-left-width: 8px;
  border-left-color: var(--mb-teal);
  box-shadow: var(--mb-shadow);
  color: var(--mb-cobalt);
}

.page-about .about-region__card:nth-child(2) { border-left-color: var(--mb-violet); }
.page-about .about-region__card:nth-child(3) { border-left-color: var(--mb-yellow); }
.page-about .about-region__card:nth-child(4) { border-left-color: var(--mb-red); }

.page-about .about-region__card h3 {
  margin: 0 0 10px;
  color: var(--mb-cobalt);
}

.page-about .about-region__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
}

/* ---------- 认可 ---------- */
.page-about .about-honor__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  padding: 26px;
  background: var(--mb-cobalt);
  border: 3px solid var(--mb-ink);
  box-shadow: var(--mb-shadow-lg);
}

.page-about .about-honor__left p {
  margin: 12px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mb-glacier);
}

.page-about .about-honor__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
  background: var(--mb-ink);
  border: 2px solid var(--mb-ink);
  align-content: start;
}

.page-about .about-honor__list li {
  display: grid;
  gap: 6px;
  padding: 16px;
  background: var(--mb-deep);
  font-size: 14px;
  line-height: 1.7;
  color: var(--mb-glacier);
}

.page-about .about-honor__year {
  color: var(--mb-yellow);
  font-weight: 700;
  font-size: 15px;
}

/* ---------- 数据带 ---------- */
.page-about .about-band {
  margin-top: clamp(28px, 5vw, 64px);
  background: var(--mb-cobalt);
  border-top: 2px solid var(--mb-ink);
  border-bottom: 2px solid var(--mb-ink);
}

.page-about .about-band__flag {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  height: 6px;
}

.page-about .about-band__flag span:nth-child(1) { background: var(--mb-cyan); }
.page-about .about-band__flag span:nth-child(2) { background: var(--mb-snow); }
.page-about .about-band__flag span:nth-child(3) { background: var(--mb-red); }
.page-about .about-band__flag span:nth-child(4) { background: var(--mb-yellow); }
.page-about .about-band__flag span:nth-child(5) { background: var(--mb-green); }

.page-about .about-band__inner {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  padding-top: 26px;
  padding-bottom: 26px;
}

.page-about .about-band__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 14px 12px;
  border-left: 3px solid var(--mb-teal);
}

.page-about .about-band__num {
  font-family: var(--mb-font-mono);
  font-size: clamp(24px, 4.4vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--mb-cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-band__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--mb-glacier);
}

/* ---------- 下一页导览 ---------- */
.page-about .about-next {
  padding-bottom: clamp(36px, 6vw, 72px);
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-next__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 18px;
  text-decoration: none;
  color: var(--mb-snow);
  background: var(--mb-deep);
  border: 2px solid var(--mb-ink);
  box-shadow: var(--mb-shadow);
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.page-about .about-next__link:focus-visible {
  outline: 3px solid var(--mb-cyan);
  outline-offset: 3px;
}

.page-about .about-next__num {
  color: var(--mb-cyan);
  font-weight: 700;
}

.page-about .about-next__text {
  font-size: 15px;
  line-height: 1.6;
}

.page-about .about-next__arrow {
  color: var(--mb-cyan);
  font-size: 20px;
  transition: transform 0.18s ease;
}

/* ---------- 交互与响应式 ---------- */
@media (hover: hover) {
  .page-about .about-team__card:hover {
    transform: translateY(-6px);
    box-shadow: var(--mb-shadow-lg);
  }

  .page-about .about-net__pair:hover .about-net__link {
    stroke: var(--mb-cyan);
    opacity: 1;
  }

  .page-about .about-next__link:hover {
    transform: translateY(-4px);
    border-color: var(--mb-cyan);
  }

  .page-about .about-next__link:hover .about-next__arrow {
    transform: translateX(5px);
  }
}

@media (min-width: 700px) {
  .page-about .about-calib__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  }

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

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

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

  .page-about .about-next__link {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: start;
    gap: 10px;
  }

  .page-about .about-next__num {
    grid-column: 1 / -1;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
  }

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

  .page-about .about-team__card--b {
    margin-top: -14px;
  }

  .page-about .about-team__card--c {
    margin-top: 10px;
  }

  .page-about .about-history__grid {
    grid-template-columns: minmax(0, 0.42fr) minmax(0, 1fr);
    gap: clamp(24px, 3.5vw, 48px);
    align-items: start;
  }

  .page-about .about-timeline__item {
    grid-template-columns: 24px 96px minmax(0, 1fr);
    grid-template-areas: "dot year card";
    gap: 0 18px;
    padding-bottom: 26px;
  }

  .page-about .about-timeline__item:nth-child(even) {
    padding-left: 44px;
  }

  .page-about .about-source__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-honor__inner {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    padding: 36px;
  }

  .page-about .about-band__inner {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    padding-top: 34px;
    padding-bottom: 34px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__media {
    margin-top: clamp(32px, 4vw, 52px);
  }

  .page-about .about-timeline__item:nth-child(even) {
    padding-left: 72px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__card,
  .page-about .about-next__link,
  .page-about .about-next__arrow,
  .page-about .about-timeline__chev,
  .page-about .about-net__link {
    transition: none;
  }

  .page-about .about-team__card:hover,
  .page-about .about-next__link:hover {
    transform: none;
  }

  .page-about .about-next__link:hover .about-next__arrow {
    transform: none;
  }
}