.page-about {
  --about-rail: clamp(52px, 7vw, 92px);
  --about-pad: clamp(56px, 8vw, 112px);
  --about-wrap-gap: clamp(18px, 3vw, 40px);
}

.page-about .about-crumb {
  padding-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(34px, 5vw, 64px) 0 clamp(52px, 7vw, 96px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 56px);
  align-items: center;
}

.page-about .about-hero__lead {
  max-width: 42rem;
}

.page-about .about-hero__tag {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--graphite);
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(32px, 6.4vw, 68px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--paper);
  -webkit-text-stroke: 1.2px rgba(0, 229, 255, 0.75);
  text-shadow: 0 0 34px rgba(0, 229, 255, 0.18);
}

.page-about .about-hero__sub {
  margin: 22px 0 0;
  max-width: 34rem;
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.9;
  color: var(--paper);
  opacity: 0.84;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-hero__visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 260px;
}

.page-about .orbit {
  width: min(100%, 420px);
  height: auto;
  display: block;
  filter: drop-shadow(0 0 26px rgba(0, 229, 255, 0.14));
}

.page-about .orbit__tick {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--graphite);
  white-space: nowrap;
}

.page-about .orbit__tick--a {
  top: 12%;
  left: 2%;
  color: var(--cyan);
}

.page-about .orbit__tick--b {
  bottom: 12%;
  right: 2%;
  color: var(--lava);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--line-steel);
}

.page-about .about-sec__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-wrap-gap);
}

.page-about .about-sec__num {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--clay);
}

.page-about .about-sec__title {
  margin: 0;
  font-size: clamp(23px, 3.2vw, 38px);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-sec__kicker {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--graphite);
}

.page-about .prose {
  margin-top: 22px;
  max-width: 40rem;
}

.page-about .prose p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--paper);
  opacity: 0.82;
}

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

/* ---------- 001 起点 ---------- */
.page-about .origin {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.5vw, 40px);
  margin-top: 26px;
  align-items: start;
}

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

.page-about .origin__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--line-steel);
  object-fit: cover;
  aspect-ratio: 3 / 4;
}

.page-about .origin__media figcaption {
  margin-top: 10px;
  font-size: 11.5px;
  line-height: 1.7;
  color: var(--graphite);
}

/* ---------- 002 时间轴 ---------- */
.page-about .tl {
  position: relative;
  margin: 34px 0 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 26px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--violet) 52%, var(--lava) 100%);
  opacity: 0.5;
}

.page-about .tl__item {
  position: relative;
  padding-bottom: clamp(26px, 4vw, 44px);
}

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

.page-about .tl__dot {
  position: absolute;
  left: -30px;
  top: 8px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.5);
}

.page-about .tl__item--lava .tl__dot {
  border-color: var(--lava);
  box-shadow: 0 0 12px rgba(255, 107, 26, 0.5);
}

.page-about .tl__year {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--cyan-soft);
}

.page-about .tl__item--lava .tl__year {
  color: var(--lava);
}

.page-about .tl__title {
  margin: 0 0 8px;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .tl__content > p {
  margin: 0;
  max-width: 38rem;
  font-size: 14.8px;
  line-height: 1.88;
  color: var(--paper);
  opacity: 0.76;
}

.page-about .tl__more {
  margin-top: 12px;
  border: 1px solid var(--line-steel);
  border-radius: var(--radius);
  background: var(--slate-deep);
  max-width: 34rem;
}

.page-about .tl__more summary {
  cursor: pointer;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--graphite);
  list-style: none;
}

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

.page-about .tl__more summary::before {
  content: "+ ";
  color: var(--cyan);
}

.page-about .tl__more[open] summary::before {
  content: "− ";
  color: var(--lava);
}

.page-about .tl__more[open] summary {
  color: var(--cyan-soft);
  border-bottom: 1px solid var(--line-steel);
}

.page-about .tl__more ul {
  margin: 0;
  padding: 12px 16px 14px 30px;
  list-style: none;
}

.page-about .tl__more li {
  position: relative;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--paper);
  opacity: 0.74;
}

.page-about .tl__more li::before {
  content: "";
  position: absolute;
  left: -14px;
  top: 11px;
  width: 5px;
  height: 5px;
  background: var(--violet);
  border-radius: 50%;
}

/* ---------- 数据带 ---------- */
.page-about .band {
  padding: clamp(30px, 4vw, 52px) 0;
  background: var(--slate);
  border-top: 1px solid var(--line-cyan);
  border-bottom: 1px solid var(--line-cyan);
}

.page-about .band__track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(150px, 1fr);
  gap: clamp(16px, 2.4vw, 34px);
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: thin;
}

.page-about .band__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 14px;
  border-left: 2px solid var(--line-cyan-strong);
}

.page-about .band__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .band__unit {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--lava);
}

.page-about .band__label {
  margin-top: 4px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--paper);
  opacity: 0.7;
}

/* ---------- 003 团队 ---------- */
.page-about .team__media {
  margin: 28px 0 0;
}

.page-about .team__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--line-steel);
  object-fit: cover;
  aspect-ratio: 1200 / 760;
}

.page-about .team__media figcaption {
  margin-top: 10px;
  font-size: 11.5px;
  line-height: 1.7;
  color: var(--graphite);
}

.page-about .roles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 26px;
}

.page-about .roles__item {
  padding: 18px 18px 20px;
  background: var(--slate);
  border: 1px solid var(--line-steel);
  border-radius: var(--radius);
  box-shadow: var(--shadow-paper);
  transition: border-color 0.18s ease, transform 0.18s ease;
}

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

.page-about .roles__name {
  margin: 0 0 8px;
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--cyan-soft);
}

.page-about .roles__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--paper);
  opacity: 0.76;
}

/* ---------- 004 覆盖版图 ---------- */
.page-about .regions {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .regions__item {
  position: relative;
  padding: 16px 18px 18px;
  background: var(--slate-deep);
  border: 1px solid var(--line-steel);
  border-left: 3px solid var(--moss);
  border-radius: var(--radius);
  transition: border-color 0.18s ease, background 0.18s ease;
}

.page-about .regions__item:hover {
  border-color: var(--cyan);
  border-left-color: var(--cyan);
  background: var(--slate);
}

.page-about .regions__name {
  display: inline-block;
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
  letter-spacing: 0.04em;
}

.page-about .regions__count {
  float: right;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--lava);
}

.page-about .regions__item:hover .regions__count {
  color: var(--cyan);
}

.page-about .regions__note {
  margin: 8px 0 0;
  clear: both;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--graphite);
}

.page-about .map-caption {
  margin: 22px 0 0;
  max-width: 40rem;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--paper);
  opacity: 0.68;
}

/* ---------- 005 合作与资质 ---------- */
.page-about .partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 30px;
}

.page-about .partners__card {
  padding: 20px 20px 22px;
  background: var(--slate);
  border: 1px solid var(--line-steel);
  border-radius: var(--radius);
  box-shadow: var(--shadow-paper);
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.page-about .partners__card:nth-child(odd) {
  transform: rotate(-0.6deg);
}

.page-about .partners__card:nth-child(even) {
  transform: rotate(0.8deg);
}

.page-about .partners__card:hover {
  border-color: var(--violet);
  transform: translateY(-4px) rotate(0deg);
}

.page-about .partners__card .card__title {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .partners__card .card__sum {
  margin: 0;
  font-size: 14px;
  line-height: 1.88;
  color: var(--paper);
  opacity: 0.78;
}

/* ---------- 006 内蒙古 ---------- */
.page-about .about-sec--grass {
  position: relative;
  overflow: hidden;
  background-image:
    repeating-linear-gradient(118deg, rgba(79, 107, 74, 0.09) 0 2px, transparent 2px 11px),
    repeating-linear-gradient(0deg, rgba(0, 229, 255, 0.035) 0 1px, transparent 1px 5px);
}

.page-about .grass__banner {
  margin: 28px 0 0;
  border: 1px solid var(--line-steel);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--slate-deep);
}

.page-about .grass__banner img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 1600 / 560;
  opacity: 0.92;
}

.page-about .grass__text {
  margin-top: 26px;
}

.page-about .grass__facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .grass__facts li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 12px 16px;
  background: var(--paper);
  border-radius: var(--radius);
  border: 1px solid var(--line-paper);
}

.page-about .grass__facts-k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--teal-ink);
  min-width: 5.5em;
}

.page-about .grass__facts-v {
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--clay-ink);
  font-variant-numeric: tabular-nums;
}

/* ---------- 007 继续了解 ---------- */
.page-about .next {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 30px;
}

.page-about .next__card {
  display: block;
  padding: 24px 22px 22px;
  background: var(--slate-deep);
  border: 1px solid var(--line-steel);
  border-top: 3px solid var(--cyan);
  border-radius: var(--radius);
  text-decoration: none;
  transition: border-color 0.18s ease, transform 0.18s ease, background 0.18s ease;
}

.page-about .next__card:hover,
.page-about .next__card:focus-visible {
  border-color: var(--cyan);
  border-top-color: var(--lava);
  background: var(--slate);
  transform: translateY(-4px);
}

.page-about .next__idx {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-display);
  font-size: 26px;
  line-height: 1;
  color: var(--violet);
}

.page-about .next__title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .next__card p {
  margin: 0 0 16px;
  font-size: 13.8px;
  line-height: 1.85;
  color: var(--paper);
  opacity: 0.74;
}

.page-about .next__go {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .next__tip {
  margin: 22px 0 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--graphite);
}

.page-about .next__tip a {
  color: var(--cyan-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .next__tip a:hover {
  color: var(--lava);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(30px, 5vw, 72px);
  }

  .page-about .about-sec__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(20px, 3vw, 44px);
  }

  .page-about .about-sec__num {
    writing-mode: vertical-rl;
    font-size: clamp(38px, 3.6vw, 54px);
    letter-spacing: 0.12em;
    padding-top: 4px;
  }

  .page-about .origin {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.72fr);
  }

  .page-about .origin__media {
    margin-top: 22px;
  }

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

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

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

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

@media (min-width: 1200px) {
  .page-about .regions {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .roles__item,
  .page-about .partners__card,
  .page-about .next__card {
    transition: none;
  }

  .page-about .partners__card:nth-child(odd),
  .page-about .partners__card:nth-child(even) {
    transform: none;
  }

  .page-about .roles__item:hover,
  .page-about .partners__card:hover,
  .page-about .next__card:hover,
  .page-about .next__card:focus-visible {
    transform: none;
  }
}