.page-about {
  --ab-pad: 18px;
  --ab-gap: 22px;
  background: var(--ink);
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  overflow-x: clip;
}

.page-about .ab-wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--ab-pad);
}

.page-about .ab-h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 8vw, 58px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--white);
  margin: 10px 0 16px;
}

.page-about .ab-h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 5vw, 34px);
  line-height: 1.22;
  letter-spacing: -0.015em;
  color: var(--white);
  margin: 6px 0 14px;
}

.page-about .ab-h3 {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.45;
  color: var(--white);
  margin: 0 0 6px;
}

.page-about p {
  margin: 0 0 14px;
}

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

/* 首屏 */
.page-about .ab-hero {
  padding: 20px 0 40px;
  background:
    radial-gradient(120% 90% at 8% 0%, rgba(27, 74, 58, 0.85), transparent 62%),
    radial-gradient(90% 70% at 100% 12%, rgba(200, 255, 77, 0.09), transparent 60%);
}

.page-about .ab-hero-grid {
  display: grid;
  gap: 26px;
  margin-top: 14px;
}

.page-about .ab-hero-lede {
  color: var(--mist);
  max-width: 36em;
}

.page-about .ab-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-about .ab-hero-stack {
  display: grid;
  gap: 12px;
}

.page-about .ab-hero-figure {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line-strong);
  background: var(--ink-2);
}

.page-about .ab-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .ab-hero-chips {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.page-about .ab-chip {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 12px 10px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: var(--glass);
  backdrop-filter: blur(6px);
}

.page-about .ab-chip--accent {
  border-color: rgba(200, 255, 77, 0.42);
  background: rgba(200, 255, 77, 0.1);
}

.page-about .ab-chip-num {
  font-size: 17px;
  font-weight: 700;
  color: var(--lime);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-about .ab-chip-label {
  font-size: 11px;
  line-height: 1.5;
  color: var(--smoke);
}

/* 通用区块 */
.page-about .ab-section {
  padding: 38px 0;
}

.page-about .ab-stack {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-panel {
  padding: 24px 20px;
}

.page-about .ab-paper {
  color: var(--ink-2);
  background: linear-gradient(180deg, var(--paper), #E7EDE1);
  border-color: rgba(14, 42, 34, 0.16);
}

.page-about .ab-paper .ab-h2 {
  color: var(--ink);
}

.page-about .ab-paper .section-label {
  color: var(--ink-3);
}

.page-about .ab-paper-sign {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid rgba(14, 42, 34, 0.16);
  font-size: 15px;
  color: var(--ink-3);
}

/* 三级归档 */
.page-about .ab-layers {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-layer {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 12px;
  padding: 14px 14px 14px 0;
  border-bottom: 1px dashed var(--line);
}

.page-about .ab-layer:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .ab-layer-num {
  display: grid;
  place-items: center;
  align-self: start;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  border: 1px solid rgba(200, 255, 77, 0.4);
  color: var(--lime);
  font-size: 13px;
  background: rgba(200, 255, 77, 0.08);
}

.page-about .ab-layer-body p {
  font-size: 15px;
  color: var(--smoke);
}

/* 双版本小卡 */
.page-about .ab-version {
  margin-top: 22px;
  padding: 16px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: rgba(7, 19, 15, 0.55);
}

.page-about .ab-version-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 12px;
}

.page-about .ab-version-count {
  font-size: 12px;
  color: var(--smoke);
  letter-spacing: 0.04em;
}

.page-about .ab-version-panes {
  display: grid;
  gap: 10px;
}

.page-about .ab-version-pane {
  padding: 12px 14px;
  border-radius: var(--r-sm);
  border-left: 3px solid var(--mist);
  background: rgba(215, 222, 212, 0.05);
  font-size: 14px;
  color: var(--mist);
}

.page-about .ab-version-pane p {
  font-size: 13.5px;
  color: var(--smoke);
  margin: 6px 0 0;
}

.page-about .ab-version-pane--a {
  border-left-color: var(--orange);
}

.page-about .ab-version-pane--a .tag {
  color: var(--orange);
  border-color: rgba(255, 138, 74, 0.5);
}

.page-about .ab-version-pane--b {
  border-left-color: var(--blue);
}

.page-about .ab-version-pane--b .tag {
  color: var(--blue);
  border-color: rgba(91, 157, 255, 0.5);
}

/* 时间线横切条带 */
.page-about .ab-band {
  padding: 44px 0 0;
  margin: 10px 0;
  background:
    linear-gradient(180deg, #0E2A22 0%, #07130F 100%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-band .band-inner {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--ab-pad);
}

.page-about .ab-band-head {
  max-width: 46em;
}

.page-about .ab-band-lede {
  color: var(--smoke);
  font-size: 15.5px;
}

.page-about .ab-filters {
  display: flex;
  gap: 8px;
  margin: 22px 0 20px;
  padding-bottom: 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .ab-filter {
  flex: 0 0 auto;
  appearance: none;
  cursor: pointer;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  transition: background 180ms var(--ease), color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .ab-filter:hover {
  border-color: var(--lime);
  color: var(--lime);
}

.page-about .ab-filter[aria-pressed="true"] {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--ink);
  font-weight: 700;
}

.page-about .ab-timeline {
  position: relative;
  display: grid;
  gap: 16px;
  padding-left: 26px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 7px;
  width: 2px;
  background: linear-gradient(180deg, var(--lime), rgba(200, 255, 77, 0.15) 60%, transparent);
}

.page-about .ab-era {
  position: relative;
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: rgba(14, 42, 34, 0.5);
}

.page-about .ab-era::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 22px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--lime);
}

.page-about .ab-era-year {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--lime);
  text-transform: uppercase;
}

.page-about .ab-era-body p {
  font-size: 14.5px;
  color: var(--smoke);
}

.page-about .ab-band-media {
  margin: 28px 0 0;
  padding-bottom: 32px;
}

.page-about .ab-band-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  filter: saturate(0.75);
}

.page-about .ab-band-media figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--smoke);
  letter-spacing: 0.02em;
}

/* 团队与协作 */
.page-about .ab-split {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-bars {
  display: grid;
  gap: 16px;
  margin-top: 18px;
}

.page-about .ab-bar-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  font-size: 14.5px;
  color: var(--white);
}

.page-about .ab-bar-head .mono {
  color: var(--lime);
  font-size: 14px;
}

.page-about .ab-bar-track {
  display: block;
  height: 9px;
  margin: 8px 0 6px;
  border-radius: 999px;
  background: rgba(215, 222, 212, 0.12);
  overflow: hidden;
}

.page-about .ab-bar-fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--ink-3), var(--lime));
  transition: filter 200ms var(--ease), transform 200ms var(--ease);
  transform-origin: left center;
}

.page-about .ab-bar-fill--a { width: 38%; }
.page-about .ab-bar-fill--b { width: 25%; }
.page-about .ab-bar-fill--c { width: 21%; }
.page-about .ab-bar-fill--d { width: 16%; }

.page-about .ab-bar:hover .ab-bar-fill {
  filter: brightness(1.25);
}

.page-about .ab-bar-desc {
  font-size: 13.5px;
  color: var(--smoke);
  margin: 0;
  transition: color 200ms var(--ease);
}

.page-about .ab-bar:hover .ab-bar-desc {
  color: var(--mist);
}

.page-about .ab-flow {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 4px;
  counter-reset: flow;
}

.page-about .ab-flow-step {
  position: relative;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  padding: 12px 0 12px 0;
}

.page-about .ab-flow-step:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 16px;
  top: 46px;
  bottom: -4px;
  border-left: 1px dashed rgba(200, 255, 77, 0.4);
}

.page-about .ab-flow-num {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: var(--ink-3);
  color: var(--lime);
  font-size: 12px;
}

.page-about .ab-flow-step p {
  font-size: 14px;
  color: var(--smoke);
  margin: 0;
}

.page-about .ab-flow-step .ab-h3 {
  font-size: 15.5px;
  margin-bottom: 2px;
}

/* 云南服务范围 */
.page-about .ab-region {
  position: relative;
  padding: 48px 0;
  margin: 8px 0;
  overflow: hidden;
  background: linear-gradient(140deg, #0E2A22 0%, #07130F 70%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-region-bg {
  position: absolute;
  inset: 0;
  opacity: 0.3;
  pointer-events: none;
}

.page-about .ab-region-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.4) contrast(1.05);
}

.page-about .ab-region::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-radial-gradient(ellipse at 12% 92%, rgba(215, 222, 212, 0.07) 0 1px, transparent 1px 26px),
    linear-gradient(180deg, rgba(7, 19, 15, 0.55), rgba(7, 19, 15, 0.88));
  pointer-events: none;
}

.page-about .ab-region-inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-region-lede {
  max-width: 46em;
  font-size: 15.5px;
  color: var(--mist);
}

.page-about .ab-region-facts {
  list-style: none;
  margin: 22px 0 18px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-region-facts li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 12px 14px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: rgba(14, 42, 34, 0.62);
  font-size: 13.5px;
  color: var(--smoke);
}

.page-about .ab-region-num {
  font-size: 20px;
  font-weight: 700;
  color: var(--lime);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-about .ab-region-note {
  font-size: 13.5px;
  color: var(--smoke);
  max-width: 44em;
  padding-left: 12px;
  border-left: 2px solid rgba(200, 255, 77, 0.55);
}

/* 为什么选择我们 */
.page-about .ab-why-head {
  max-width: 42em;
  margin-bottom: 20px;
}

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

.page-about .ab-reason {
  padding: 18px 18px 16px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(14, 42, 34, 0.9), rgba(7, 19, 15, 0.75));
}

.page-about .ab-reason-num {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--lime);
  margin-bottom: 8px;
}

.page-about .ab-reason p {
  font-size: 14.5px;
  color: var(--smoke);
}

/* 收尾 */
.page-about .ab-cta {
  padding: 12px 0 48px;
}

.page-about .ab-cta-panel {
  padding: 26px 20px;
  border-color: rgba(200, 255, 77, 0.32);
}

.page-about .ab-cta-copy p {
  font-size: 15px;
  color: var(--mist);
}

.page-about .ab-cta-copy strong {
  color: var(--lime);
  font-family: var(--font-mono);
  font-weight: 700;
  word-break: break-all;
}

.page-about .ab-cta-actions {
  display: grid;
  gap: 10px;
  margin-top: 20px;
}

.page-about .ab-cta-note {
  margin-top: 14px;
  font-size: 12.5px;
  color: var(--smoke);
  letter-spacing: 0.02em;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-filter,
  .page-about .ab-bar-fill,
  .page-about .ab-bar-desc {
    transition: none;
  }
}

@media (min-width: 640px) {
  .page-about {
    --ab-pad: 26px;
    --ab-gap: 26px;
  }

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

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

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

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

@media (min-width: 900px) {
  .page-about {
    --ab-pad: 40px;
    --ab-gap: 34px;
    font-size: 17px;
  }

  .page-about .ab-hero {
    padding: 28px 0 56px;
  }

  .page-about .ab-hero-grid {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: start;
    gap: 44px;
    margin-top: 22px;
  }

  .page-about .ab-hero-stack {
    margin-top: 26px;
    padding-left: 18px;
  }

  .page-about .ab-hero-chips {
    margin: -46px 0 0 -34px;
    padding-right: 0;
    position: relative;
    z-index: 2;
  }

  .page-about .ab-chip {
    padding: 14px 12px;
    background: rgba(14, 42, 34, 0.92);
  }

  .page-about .ab-chip-num {
    font-size: 20px;
  }

  .page-about .ab-section {
    padding: 52px 0;
  }

  .page-about .ab-stack {
    grid-template-columns: 0.92fr 1.08fr;
    align-items: start;
  }

  .page-about .ab-panel {
    padding: 30px 28px;
  }

  .page-about .ab-stack .ab-paper {
    margin-top: 34px;
  }

  .page-about .ab-stack .ab-panel:not(.ab-paper) {
    margin-bottom: 22px;
  }

  .page-about .ab-band {
    padding-top: 58px;
  }

  .page-about .ab-timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 24px;
    padding-left: 30px;
  }

  .page-about .ab-era::before {
    left: -30px;
  }

  .page-about .ab-split {
    grid-template-columns: 0.95fr 1.05fr;
    align-items: start;
  }

  .page-about .ab-split .ab-panel--coop {
    margin-top: 40px;
  }

  .page-about .ab-region {
    padding: 72px 0;
  }

  .page-about .ab-region-inner {
    display: grid;
    grid-template-columns: 7fr 5fr;
    column-gap: 48px;
    align-items: start;
  }

  .page-about .ab-region-inner > .section-label,
  .page-about .ab-region-inner > .ab-h2,
  .page-about .ab-region-inner > .ab-region-lede,
  .page-about .ab-region-inner > .ab-region-note {
    grid-column: 1;
  }

  .page-about .ab-region-facts {
    grid-column: 2;
    grid-row: 1 / span 4;
    margin: 0;
    align-self: start;
  }

  .page-about .ab-reasons {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .ab-cta-panel {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 36px;
    align-items: center;
    padding: 36px 32px;
  }

  .page-about .ab-cta-actions {
    margin-top: 0;
    grid-template-columns: 1fr;
  }
}

@media (min-width: 1200px) {
  .page-about .ab-timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-band-media img {
    aspect-ratio: 16 / 6;
  }
}
</main>