.page-about {
  --about-radius: 4px;
  --about-thin: 2px;
  --about-gap: clamp(24px, 4vw, 40px);
}

/* ================= 面包屑 ================= */
.page-about .about-crumbrow {
  padding-top: 14px;
  padding-bottom: 14px;
}

/* ================= 首屏 ================= */
.page-about .about-hero {
  position: relative;
  padding-bottom: clamp(36px, 6vw, 72px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  background-image:
    repeating-linear-gradient(0deg, rgba(0, 230, 195, .05) 0 1px, transparent 1px 52px),
    repeating-linear-gradient(90deg, rgba(122, 140, 166, .07) 0 1px, transparent 1px 132px);
  -webkit-mask-image: radial-gradient(120% 90% at 84% 0%, #000 0 40%, transparent 78%);
  mask-image: radial-gradient(120% 90% at 84% 0%, #000 0 40%, transparent 78%);
}

.page-about .about-hero > .wm-shell {
  position: relative;
  z-index: 2;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 5vw, 48px);
  align-items: end;
}

.page-about .about-hero__title {
  margin: 10px 0 20px;
  font-family: var(--wm-font-display);
  font-weight: 900;
  font-size: clamp(2.4rem, 8.4vw, 4.8rem);
  line-height: .94;
  letter-spacing: -.012em;
  text-transform: uppercase;
  color: var(--wm-paper);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 58ch;
  color: var(--wm-body-dim);
  font-size: clamp(1rem, 2.3vw, 1.08rem);
  line-height: 1.78;
}

.page-about .about-hero__stats {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  margin: 30px 0 0;
  padding: 0;
  border-top: var(--about-thin) solid var(--wm-steel);
  border-bottom: var(--about-thin) solid var(--wm-steel);
}

.page-about .about-hero__stats li {
  flex: 1 1 33%;
  min-width: 132px;
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 14px 16px 16px 0;
}

.page-about .about-hero__stats li + li {
  border-left: 1px solid var(--wm-steel);
  padding-left: 16px;
}

.page-about .about-hero__statnum {
  font-family: var(--wm-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.45rem, 4vw, 2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--wm-cyan);
}

.page-about .about-hero__statlbl {
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--wm-mist);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: var(--wm-rule) solid var(--wm-steel);
  border-radius: var(--about-radius);
  background: var(--wm-abyss);
  box-shadow: var(--wm-shadow-hard);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.86) contrast(1.06);
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
  }
  .page-about .about-hero__figure {
    transform: translateY(10px);
  }
}

/* ================= 正文骨架 ================= */
.page-about .about-body {
  padding-top: clamp(28px, 5vw, 64px);
  padding-bottom: clamp(40px, 7vw, 96px);
}

.page-about .about-body__head {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-body__head .wm-eyebrow {
  margin: 0;
}

.page-about .wm-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

@media (min-width: 760px) {
  .page-about .about-body__head {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.page-about .about-sections {
  display: flex;
  flex-direction: column;
  gap: var(--about-gap);
}

.page-about .wm-frame {
  position: relative;
}

/* ================= 章节通用 ================= */
.page-about .about-section {
  position: relative;
  padding: clamp(26px, 4.5vw, 54px);
  border: var(--wm-rule) solid var(--wm-steel);
  border-radius: var(--about-radius);
  background: var(--wm-abyss);
  color: var(--wm-paper);
  --about-body-text: var(--wm-body-dim);
  --about-rule: var(--wm-steel);
  --about-link: var(--wm-cyan);
}

.page-about .about-section--dark {
  background: var(--wm-abyss);
  color: var(--wm-paper);
  --about-body-text: var(--wm-body-dim);
  --about-rule: var(--wm-steel);
  --about-link: var(--wm-cyan);
}

.page-about .about-section--cream {
  background: var(--wm-cream);
  color: var(--wm-ink);
  border-color: var(--wm-gold);
  box-shadow: var(--wm-shadow-hard);
  --about-body-text: rgba(36, 26, 18, .82);
  --about-rule: rgba(36, 26, 18, .16);
  --about-link: #0F8B76;
}

.page-about .about-section__num {
  margin: 0 0 12px;
  font-family: var(--wm-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  font-weight: 700;
  letter-spacing: .08em;
  line-height: 1;
  color: var(--wm-cyan);
}

.page-about .about-section--cream .about-section__num {
  color: rgba(36, 26, 18, .72);
}

.page-about .about-section h2 {
  margin: 0 0 18px;
  font-family: var(--wm-font-display);
  font-weight: 800;
  font-size: clamp(1.55rem, 3.8vw, 2.4rem);
  line-height: 1.12;
  letter-spacing: -.005em;
}

.page-about .about-section__lead {
  margin: 0 0 14px;
  max-width: 68ch;
  font-size: clamp(1rem, 2.1vw, 1.06rem);
  line-height: 1.78;
  color: var(--wm-paper);
}

.page-about .about-section--cream .about-section__lead {
  color: var(--wm-ink);
}

.page-about .about-section__body {
  margin: 0 0 14px;
  max-width: 70ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--about-body-text);
}

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

.page-about .about-section a {
  color: var(--about-link);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color .18s var(--wm-ease);
}

.page-about .about-section a:hover,
.page-about .about-section a:focus-visible {
  color: var(--wm-orange);
}

/* ================= 团队分工 ================= */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 26px;
}

.page-about .about-team__item {
  padding: 6px 0 6px 18px;
  border-left: 3px solid var(--wm-cyan);
}

.page-about .about-team__item:nth-child(2) {
  border-left-color: var(--wm-amber);
}

.page-about .about-team__item:nth-child(3) {
  border-left-color: var(--wm-orange);
}

.page-about .about-team__role {
  margin: 0 0 8px;
  font-family: var(--wm-font-display);
  font-weight: 800;
  font-size: 1.18rem;
  letter-spacing: .01em;
  color: var(--wm-paper);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: .96rem;
  line-height: 1.76;
  color: var(--about-body-text);
}

@media (min-width: 760px) {
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
}

/* ================= 数据轨迹 ================= */
.page-about .about-flow__figure {
  margin: 22px 0 4px;
  overflow: hidden;
  border: var(--wm-rule) solid var(--wm-gold);
  border-radius: var(--about-radius);
  background: var(--wm-abyss);
}

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

.page-about .about-flow {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  border-top: var(--about-thin) solid var(--wm-gold);
}

.page-about .about-flow__step {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 18px 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-flow__time {
  font-family: var(--wm-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--wm-ink);
}

.page-about .about-flow__title {
  margin: 0 0 5px;
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--wm-ink);
}

.page-about .about-flow__desc {
  margin: 0;
  font-size: .96rem;
  line-height: 1.75;
  color: var(--about-body-text);
}

@media (min-width: 640px) {
  .page-about .about-flow__step {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

/* ================= 更新节奏 ================= */
.page-about .about-rhythm {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 26px;
}

.page-about .about-rhythm__item {
  padding: 22px 20px 24px;
  background: var(--wm-steel);
  border: var(--about-thin) solid var(--wm-steel);
  border-top: 3px solid var(--wm-cyan);
  border-radius: var(--about-radius);
}

.page-about .about-rhythm__tag {
  display: inline-block;
  margin: 0 0 12px;
  font-family: var(--wm-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--wm-cyan);
}

.page-about .about-rhythm__title {
  margin: 0 0 8px;
  font-size: 1.04rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--wm-paper);
}

.page-about .about-rhythm__desc {
  margin: 0;
  font-size: .94rem;
  line-height: 1.75;
  color: var(--about-body-text);
}

@media (min-width: 760px) {
  .page-about .about-rhythm {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ================= 合作与接入 ================= */
.page-about .about-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: 20px;
}

.page-about .about-partners__figure {
  margin: 0;
  overflow: hidden;
  border: var(--wm-rule) solid var(--wm-gold);
  border-radius: var(--about-radius);
  background: var(--wm-void);
}

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

@media (min-width: 880px) {
  .page-about .about-partners {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 40px;
    align-items: start;
  }
}

/* ================= 发展节点 ================= */
.page-about .about-timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 20px 0 22px 30px;
  border-left: 2px solid var(--wm-steel);
  transition: background-color .18s var(--wm-ease), border-color .18s var(--wm-ease);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 26px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--wm-void);
  border: 3px solid var(--wm-cyan);
  transition: background-color .18s var(--wm-ease), border-color .18s var(--wm-ease);
}

.page-about .about-timeline__item:hover,
.page-about .about-timeline__item:focus-within {
  border-left-color: var(--wm-cyan);
  background: rgba(0, 230, 195, .06);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  background: var(--wm-cyan);
  border-color: var(--wm-void);
}

.page-about .about-timeline__year {
  margin: 0;
  font-family: var(--wm-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 3.6vw, 2.1rem);
  font-weight: 700;
  line-height: 1;
  color: var(--wm-amber);
}

.page-about .about-timeline__title {
  margin: 0 0 6px;
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--wm-paper);
}

.page-about .about-timeline__desc {
  margin: 0;
  font-size: .96rem;
  line-height: 1.75;
  color: var(--about-body-text);
}

.page-about .about-timeline__desc a {
  color: var(--wm-cyan);
}

@media (min-width: 720px) {
  .page-about .about-timeline__item {
    grid-template-columns: 128px minmax(0, 1fr);
    gap: 28px;
    padding-left: 36px;
    align-items: start;
  }
}

/* ================= 问答 ================= */
.page-about .about-faq {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-faq__item {
  border: var(--about-thin) solid var(--about-rule);
  border-radius: var(--about-radius);
  background: rgba(255, 255, 255, .42);
  transition: border-color .18s var(--wm-ease), background-color .18s var(--wm-ease);
}

.page-about .about-faq__item[open] {
  border-left-width: 6px;
  border-left-color: var(--wm-ink);
  background: rgba(255, 255, 255, .72);
}

.page-about .about-faq__q {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 1.04rem;
  font-weight: 700;
  color: var(--wm-ink);
}

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

.page-about .about-faq__q::marker {
  content: "";
}

.page-about .about-faq__q::before {
  content: "+";
  flex: 0 0 auto;
  width: 1em;
  font-family: var(--wm-font-mono);
  font-weight: 700;
  color: var(--about-link);
}

.page-about .about-faq__item[open] .about-faq__q::before {
  content: "−";
}

.page-about .about-faq__q:focus-visible {
  outline: 2px solid var(--wm-cyan);
  outline-offset: -2px;
}

.page-about .about-faq__a {
  margin: 0;
  padding: 0 18px 18px 46px;
  font-size: .96rem;
  line-height: 1.8;
  color: var(--about-body-text);
}

/* ================= 移动端兜底 ================= */
@media (max-width: 560px) {
  .page-about .about-hero__stats li {
    flex: 1 1 100%;
    padding-left: 0;
  }
  .page-about .about-hero__stats li + li {
    border-left: 0;
    border-top: 1px solid var(--wm-steel);
    padding-left: 0;
  }
  .page-about .about-section {
    padding: 22px 18px;
  }
  .page-about .about-faq__a {
    padding-left: 18px;
  }
}

/* ================= 降低动效偏好 ================= */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item,
  .page-about .about-timeline__item::before,
  .page-about .about-faq__item,
  .page-about .about-section a {
    transition: none;
  }
}
</main>