.page-about {
  --ab-panel-edge: 2px;
  --ab-shadow: 6px 6px 0 var(--mb-shadow);
  --ab-shadow-sm: 4px 4px 0 var(--mb-shadow);
}

.page-about [id] {
  scroll-margin-top: calc(var(--mb-head) + 18px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--mb-head) + 40px) 0 clamp(44px, 7vw, 76px);
  background: var(--mb-night);
  border-bottom: var(--ab-panel-edge) solid var(--mb-line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--mb-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--mb-line) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: 0.3;
  -webkit-mask-image: radial-gradient(circle at 76% 26%, #000 0%, transparent 70%);
  mask-image: radial-gradient(circle at 76% 26%, #000 0%, transparent 70%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -140px;
  bottom: -190px;
  width: 420px;
  height: 420px;
  border: 2px dashed var(--mb-line);
  border-radius: 50%;
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 5vw, 48px);
}

.page-about .about-hero__copy .mb-crumbs {
  margin-bottom: 18px;
}

.page-about .about-hero__copy .mb-eyebrow {
  margin-bottom: 12px;
}

.page-about .about-hero__copy .mb-h1 {
  margin-bottom: 18px;
  max-width: 15em;
}

.page-about .about-hero__copy .mb-lede {
  max-width: 62ch;
  color: var(--mb-mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__board {
  border: var(--ab-panel-edge) solid var(--mb-line);
  background: var(--mb-panel);
  box-shadow: var(--ab-shadow);
  padding: clamp(18px, 3vw, 26px);
}

.page-about .about-hero__board-title {
  margin: 0 0 16px;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--mb-cyan);
  text-transform: uppercase;
}

.page-about .about-board {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  border-top: 1px solid var(--mb-line);
  border-left: 1px solid var(--mb-line);
}

.page-about .about-board__cell {
  padding: 14px 12px;
  border-right: 1px solid var(--mb-line);
  border-bottom: 1px solid var(--mb-line);
}

.page-about .about-board__label {
  font-size: 12px;
  color: var(--mb-mist);
  letter-spacing: 0.04em;
}

.page-about .about-board__value {
  margin: 8px 0 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
  font-family: var(--mb-mono);
  font-size: clamp(1.7rem, 5vw, 2.2rem);
  line-height: 1;
  color: var(--mb-lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-board__unit {
  font-family: var(--mb-font);
  font-size: 13px;
  color: var(--mb-mist);
}

.page-about .about-hero__board-note {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mb-mist);
}

/* ---------- 通用小标题组 ---------- */
.page-about .about-sec-head {
  max-width: 60ch;
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-sec-head .mb-h2 {
  margin: 10px 0 14px;
}

.page-about .about-sec-head__lede {
  margin: 0;
  color: var(--mb-mist);
}

/* ---------- 来路 ---------- */
.page-about .about-origin {
  border-bottom: 1px solid var(--mb-line);
}

.page-about .about-origin__grid {
  display: grid;
  gap: clamp(28px, 4vw, 46px);
}

.page-about .about-origin__text .mb-h2 {
  margin: 10px 0 18px;
}

.page-about .about-origin__text p {
  max-width: 64ch;
  color: var(--mb-mist);
}

.page-about .about-origin__index {
  display: grid;
  gap: 0;
  border: var(--ab-panel-edge) solid var(--mb-line);
  background: var(--mb-night-2);
}

.page-about .about-origin__index .mb-index__link {
  display: grid;
  gap: 6px;
  padding: 18px;
  border-bottom: 1px solid var(--mb-line);
  color: var(--mb-ink);
  text-decoration: none;
  transition: transform 0.16s var(--mb-ease), background-color 0.16s var(--mb-ease);
}

.page-about .about-origin__index .mb-index__link:last-child {
  border-bottom: 0;
}

.page-about .about-origin__index .mb-index__link:hover,
.page-about .about-origin__index .mb-index__link:focus-visible {
  background: var(--mb-panel);
  transform: translate(-2px, -2px);
}

.page-about .about-origin__index .mb-index__kicker {
  font-family: var(--mb-mono);
  font-size: 12px;
  color: var(--mb-violet);
  letter-spacing: 0.14em;
}

.page-about .about-origin__index .mb-index__title {
  font-size: 1.2rem;
  font-weight: 800;
}

.page-about .about-origin__index .mb-index__desc {
  font-size: 14px;
  color: var(--mb-mist);
  line-height: 1.7;
}

.page-about .about-origin__index .mb-index__go {
  font-size: 13px;
  color: var(--mb-cyan);
}

/* ---------- 三件笨功夫 ---------- */
.page-about .about-three {
  border-bottom: 1px solid var(--mb-line);
}

.page-about .about-three__grid {
  display: grid;
  gap: 18px;
}

.page-about .about-three__item {
  position: relative;
  padding: 26px 22px 24px;
  border: var(--ab-panel-edge) solid var(--mb-line);
  background: var(--mb-night-2);
  box-shadow: var(--ab-shadow-sm);
  transition: transform 0.16s var(--mb-ease), box-shadow 0.16s var(--mb-ease);
}

.page-about .about-three__item:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--mb-shadow);
}

.page-about .about-three__idx {
  display: block;
  font-size: 2.4rem;
  line-height: 1;
  color: var(--mb-violet);
  margin-bottom: 14px;
}

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

.page-about .about-three__item p {
  margin: 0;
  color: var(--mb-mist);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  border-bottom: 1px solid var(--mb-line);
}

.page-about .about-tl {
  display: grid;
  gap: 22px;
}

.page-about .about-tl__list {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: 4px 2px 14px;
  border-bottom: var(--ab-panel-edge) solid var(--mb-line);
  scrollbar-width: thin;
}

.page-about .about-tl__node {
  position: relative;
  flex: 0 0 auto;
  display: grid;
  gap: 4px;
  min-width: 156px;
  padding: 12px 16px 12px 20px;
  border: 1px solid var(--mb-line);
  background: var(--mb-night-2);
  color: var(--mb-mist);
  text-align: left;
  cursor: pointer;
  transition: transform 0.16s var(--mb-ease), border-color 0.16s var(--mb-ease), color 0.16s var(--mb-ease);
}

.page-about .about-tl__node:hover {
  transform: translateY(-2px);
  border-color: var(--mb-cyan);
}

.page-about .about-tl__dot {
  position: absolute;
  left: -5px;
  top: 50%;
  width: 10px;
  height: 10px;
  margin-top: -5px;
  border-radius: 50%;
  background: var(--mb-violet);
}

.page-about .about-tl__year {
  font-size: 1.35rem;
  line-height: 1.1;
  color: var(--mb-ink);
}

.page-about .about-tl__label {
  font-size: 13px;
  color: var(--mb-mist);
}

.page-about .about-tl__node[aria-selected="true"] {
  border-color: var(--mb-lime);
  background: var(--mb-panel);
  color: var(--mb-ink);
}

.page-about .about-tl__node[aria-selected="true"] .about-tl__dot {
  background: var(--mb-lime);
  box-shadow: 0 0 0 4px rgba(182, 255, 60, 0.18);
}

.page-about .about-tl__node[aria-selected="true"] .about-tl__year {
  color: var(--mb-lime);
}

.page-about .about-tl__panels {
  display: grid;
  gap: 14px;
}

.page-about .about-tl__panel {
  padding: clamp(20px, 3vw, 30px);
  border: var(--ab-panel-edge) solid var(--mb-line);
  background: var(--mb-panel);
  box-shadow: var(--ab-shadow);
}

.page-about .about-tl__panel .mb-badge {
  margin-bottom: 14px;
}

.page-about .about-tl__panel .mb-h3 {
  margin: 0 0 12px;
}

.page-about .about-tl__panel p {
  margin: 0;
  color: var(--mb-mist);
  max-width: 60ch;
}

.page-about .about-tl__facts {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px dashed var(--mb-line);
}

.page-about .about-tl__facts li {
  padding: 10px 0;
  border-bottom: 1px dashed var(--mb-line);
  font-size: 14px;
  color: var(--mb-ink);
}

.page-about .about-tl__facts li::before {
  content: "▸";
  color: var(--mb-orange);
  margin-right: 8px;
  font-size: 12px;
}

/* ---------- 图片容器 ---------- */
.page-about .about-shot {
  margin: 0;
  border: var(--ab-panel-edge) solid var(--mb-line);
  background: var(--mb-night-2);
  box-shadow: var(--ab-shadow-sm);
}

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

.page-about .about-shot--desk img {
  aspect-ratio: 3 / 2;
}

.page-about .about-shot--archive img {
  aspect-ratio: 2 / 1;
}

.page-about .about-shot figcaption {
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mb-mist);
  border-top: 1px solid var(--mb-line);
}

/* ---------- 团队与流程（暖沙反相） ---------- */
.page-about .about-team {
  color: var(--mb-night);
  border-bottom: var(--ab-panel-edge) solid var(--mb-night);
}

.page-about .about-team .mb-h2,
.page-about .about-team .mb-h3,
.page-about .about-team .about-flow__title {
  color: var(--mb-night);
}

.page-about .about-team .mb-eyebrow {
  color: #4a5a2a;
}

.page-about .about-team__top {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  margin-bottom: clamp(34px, 5vw, 56px);
}

.page-about .about-team__intro p {
  max-width: 58ch;
  color: #33465a;
}

.page-about .about-team__intro .mb-h2 {
  margin: 10px 0 16px;
}

.page-about .about-team .about-shot {
  border-color: var(--mb-night);
  background: #f7f3ea;
  box-shadow: 6px 6px 0 rgba(7, 19, 32, 0.22);
}

.page-about .about-team .about-shot figcaption {
  border-top-color: rgba(7, 19, 32, 0.25);
  color: #33465a;
}

.page-about .about-team__flow-head {
  max-width: 52ch;
  margin-bottom: 20px;
}

.page-about .about-team__flow-head .mb-h3 {
  margin: 0 0 8px;
}

.page-about .about-team__flow-head p {
  margin: 0;
  color: #33465a;
}

.page-about .about-flow {
  display: grid;
  gap: 18px;
  margin-bottom: clamp(26px, 4vw, 40px);
}

.page-about .about-flow__list {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 6px;
}

.page-about .about-flow__tab {
  flex: 0 0 auto;
  padding: 10px 22px;
  border: 2px solid var(--mb-night);
  background: transparent;
  color: var(--mb-night);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: transform 0.16s var(--mb-ease);
}

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

.page-about .about-flow__tab[aria-selected="true"] {
  background: var(--mb-night);
  color: var(--mb-lime);
}

.page-about .about-flow__panels {
  display: grid;
  gap: 12px;
}

.page-about .about-flow__panel {
  padding: clamp(20px, 3vw, 28px);
  border: 2px solid var(--mb-night);
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 6px 6px 0 rgba(7, 19, 32, 0.16);
}

.page-about .about-flow__step {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: #ffffff;
  background: var(--mb-orange);
  padding: 3px 10px;
  margin: 0 0 12px;
}

.page-about .about-flow__title {
  margin: 0 0 10px;
  font-size: 1.15rem;
  font-weight: 800;
}

.page-about .about-flow__panel p {
  margin: 0;
  color: #33465a;
  max-width: 64ch;
}

/* ---------- 服务半径 ---------- */
.page-about .about-reach {
  border-bottom: 1px solid var(--mb-line);
}

.page-about .about-reach__grid {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--mb-line);
  border-left: 1px solid var(--mb-line);
}

.page-about .about-reach__stat {
  padding: clamp(18px, 3vw, 26px);
  border-right: 1px solid var(--mb-line);
  border-bottom: 1px solid var(--mb-line);
  background: var(--mb-night-2);
}

.page-about .about-reach__num {
  display: block;
  font-size: clamp(2.4rem, 8vw, 3.4rem);
  line-height: 1;
  color: var(--mb-lime);
}

.page-about .about-reach__unit {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  color: var(--mb-ink);
  letter-spacing: 0.06em;
}

.page-about .about-reach__stat p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mb-mist);
}

.page-about .about-reach__note {
  display: grid;
  gap: 16px;
  align-items: start;
  margin-top: clamp(24px, 4vw, 38px);
  padding: 22px;
  border: var(--ab-panel-edge) solid var(--mb-line);
  border-left: 6px solid var(--mb-orange);
  background: var(--mb-panel);
}

.page-about .about-reach__note p {
  margin: 0;
  color: var(--mb-mist);
  max-width: 62ch;
}

/* ---------- 合作方收尾 ---------- */
.page-about .about-partners {
  border-bottom: 0;
}

.page-about .about-partners__head {
  max-width: 62ch;
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-about .about-partners__head .mb-h2 {
  margin-bottom: 12px;
}

.page-about .about-partners__head p {
  margin: 0;
  color: var(--mb-mist);
}

.page-about .about-partners__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--mb-line);
  border-left: 1px solid var(--mb-line);
}

.page-about .about-partners__item {
  padding: 22px 20px;
  border-right: 1px solid var(--mb-line);
  border-bottom: 1px solid var(--mb-line);
  background: var(--mb-night-2);
  transition: background-color 0.18s var(--mb-ease);
}

.page-about .about-partners__item:hover,
.page-about .about-partners__item:focus-visible,
.page-about .about-partners__item:focus-within {
  background: var(--mb-panel);
  outline: none;
}

.page-about .about-partners__item .mb-h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.page-about .about-partners__desc {
  margin: 0;
  font-size: 14px;
  color: var(--mb-mist);
}

.page-about .about-partners__meta {
  margin: 10px 0 0;
  font-size: 13px;
  color: var(--mb-cyan);
}

.page-about .about-partners__foot {
  margin: clamp(22px, 3vw, 30px) 0 0;
  font-size: 14px;
  color: var(--mb-mist);
}

.page-about .about-partners__foot a {
  color: var(--mb-lime);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-three__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

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

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

  .page-about .about-reach__note {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .about-team__top {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: center;
  }

  .page-about .about-team__flow {
    max-width: 100%;
  }

  .page-about .about-shot--desk {
    max-width: 880px;
  }

  .page-about .about-tl {
    grid-template-columns: minmax(0, 260px) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-tl__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
    border-bottom: 0;
    border-left: var(--ab-panel-edge) dashed var(--mb-line);
  }

  .page-about .about-tl__node {
    width: 100%;
    min-width: 0;
    border: 0;
    border-left: 0;
    background: transparent;
    padding: 16px 14px 16px 26px;
  }

  .page-about .about-tl__node:hover {
    transform: translateX(2px);
    border-color: transparent;
  }

  .page-about .about-tl__dot {
    left: -6px;
    top: 26px;
    margin-top: 0;
  }

  .page-about .about-tl__node[aria-selected="true"] {
    background: var(--mb-night-2);
  }

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

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

@media (hover: hover) and (min-width: 820px) {
  .page-about .about-partners__meta {
    opacity: 0;
    transform: translateY(4px);
    transition: opacity 0.18s var(--mb-ease), transform 0.18s var(--mb-ease);
  }

  .page-about .about-partners__item:hover .about-partners__meta,
  .page-about .about-partners__item:focus-visible .about-partners__meta {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-origin__index .mb-index__link,
  .page-about .about-three__item,
  .page-about .about-tl__node,
  .page-about .about-flow__tab,
  .page-about .about-partners__meta {
    transition: none;
  }

  .page-about .about-origin__index .mb-index__link:hover,
  .page-about .about-three__item:hover,
  .page-about .about-tl__node:hover {
    transform: none;
  }

  .page-about .about-partners__meta {
    opacity: 1;
    transform: none;
  }
}