.page-about {
  --about-line: rgba(11, 43, 38, 0.18);
  --about-line-dark: rgba(244, 240, 230, 0.24);
  --about-cream-soft: rgba(244, 240, 230, 0.74);
  background: var(--stand-cream);
  color: var(--ink-green);
}

.page-about .yd-kicker {
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: 700;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.4rem, 5vw, 2.4rem) 0 clamp(2.6rem, 7vw, 4.4rem);
  background:
    radial-gradient(115% 80% at 84% -18%, rgba(168, 255, 62, 0.2), transparent 60%),
    radial-gradient(95% 75% at -5% 118%, rgba(122, 31, 61, 0.6), transparent 58%),
    linear-gradient(180deg, var(--ink-green) 0%, #07201C 100%);
  color: var(--stand-cream);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 6px;
  background: var(--stripe);
}

.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--about-cream-soft);
  margin-bottom: clamp(1.2rem, 4vw, 2rem);
}

.page-about .about-crumb a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  border-bottom-color: var(--lime);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.6rem, 4vw, 2.8rem);
  align-items: start;
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.9rem, 6.4vw, 3.9rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0.7rem 0 1rem;
}

.page-about .about-hero__title span {
  display: block;
  color: var(--lime);
}

.page-about .about-hero__lede {
  max-width: 34rem;
  line-height: 1.85;
  color: var(--about-cream-soft);
  margin: 0 0 1.5rem;
}

.page-about .about-hero__actions,
.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.page-about .about-hero__panel {
  border: 3px solid var(--lime);
  background: rgba(7, 17, 31, 0.66);
  box-shadow: 8px 8px 0 rgba(168, 255, 62, 0.28);
  padding: clamp(1.05rem, 3vw, 1.6rem);
}

.page-about .about-panel__title {
  margin: 0 0 1rem;
  font-family: var(--font-num);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--lime);
}

.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem 1rem;
}

.page-about .about-stats li {
  border-top: 1px solid var(--about-line-dark);
  padding-top: 0.55rem;
}

.page-about .about-stats .yd-num {
  display: block;
  font-size: clamp(1.3rem, 4.2vw, 1.75rem);
  font-weight: 700;
  color: var(--lime);
  line-height: 1.1;
}

.page-about .about-stats__label {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.76rem;
  line-height: 1.55;
  color: var(--about-cream-soft);
}

.page-about .about-jump {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.2rem;
  margin: clamp(1.6rem, 5vw, 2.6rem) 0 0;
  padding: 0.9rem 0 0;
  border-top: 1px solid var(--about-line-dark);
}

.page-about .about-jump a {
  font-family: var(--font-num);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  color: var(--stand-cream);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  padding-bottom: 0.15rem;
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: clamp(2.4rem, 7vw, 5rem) 0;
}

.page-about .about-chapter--paper {
  background: var(--stand-cream);
  color: var(--ink-green);
}

.page-about .about-chapter--deep {
  background: var(--paper-deep);
  color: var(--ink-green);
}

.page-about .about-chapter--night {
  background:
    linear-gradient(180deg, var(--night-blue) 0%, #0A1830 100%);
  color: var(--stand-cream);
}

.page-about .about-chapter--wine {
  background: var(--wine);
  color: var(--stand-cream);
}

.page-about .about-chapter--ink {
  background: var(--ink-black);
  color: var(--stand-cream);
}

.page-about .about-chapter__head {
  display: flex;
  align-items: flex-start;
  gap: 0.9rem;
  flex-wrap: wrap;
  padding-bottom: 1rem;
  margin-bottom: clamp(1.5rem, 4vw, 2.6rem);
  border-bottom: 2px solid var(--about-line);
}

.page-about .about-chapter--night .about-chapter__head,
.page-about .about-chapter--wine .about-chapter__head,
.page-about .about-chapter--ink .about-chapter__head {
  border-bottom-color: var(--about-line-dark);
}

.page-about .about-chapter__num {
  display: inline-block;
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1;
  padding: 0.4rem 0.55rem;
  background: var(--lime);
  color: var(--ink-black);
  border: 2px solid var(--ink-black);
  box-shadow: 4px 4px 0 var(--ink-black);
}

.page-about .about-chapter__headtext {
  flex: 1 1 14rem;
  min-width: 0;
}

.page-about .about-chapter__headtext .yd-kicker {
  margin: 0 0 0.4rem;
  opacity: 0.72;
}

.page-about .yd-section-title {
  margin: 0;
  font-size: clamp(1.35rem, 4vw, 2.1rem);
  line-height: 1.28;
  letter-spacing: -0.01em;
  font-weight: 800;
}

/* ---------- 分栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.4rem, 4vw, 2.8rem);
  align-items: start;
}

.page-about .about-copy p {
  max-width: 33rem;
  margin: 0 0 1rem;
  line-height: 1.88;
  font-size: 1rem;
}

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

.page-about .about-copy--on-dark {
  color: rgba(244, 240, 230, 0.86);
}

.page-about .about-media {
  margin: 0;
  border: 3px solid var(--ink-black);
  box-shadow: 8px 8px 0 var(--ink-black);
  background: var(--ink-black);
  position: relative;
  overflow: hidden;
}

.page-about .about-media--wide {
  border-color: var(--lime);
  box-shadow: 8px 8px 0 rgba(7, 17, 31, 0.65);
}

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

.page-about .about-media .yd-media__tag {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 0.35rem 0.65rem;
  background: var(--paper);
  color: var(--ink-black);
  font-family: var(--font-num);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}

/* ---------- 要点清单 ---------- */
.page-about .about-points {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.1rem;
}

.page-about .about-points li {
  border-left: 4px solid var(--ink-green);
  padding-left: 0.95rem;
}

.page-about .about-points__tag {
  display: inline-block;
  margin-bottom: 0.35rem;
}

.page-about .about-points p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: rgba(11, 43, 38, 0.86);
}

/* ---------- 方法三步 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: clamp(1.8rem, 5vw, 3rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
  counter-reset: none;
}

.page-about .about-steps li {
  border: 2px solid var(--about-line-dark);
  background: rgba(7, 17, 31, 0.44);
  padding: 1.05rem 1.1rem 1.15rem;
}

.page-about .about-steps__num {
  display: block;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--lime);
  margin-bottom: 0.5rem;
}

.page-about .about-steps h3 {
  margin: 0 0 0.45rem;
  font-size: 1.02rem;
  line-height: 1.5;
  font-weight: 700;
}

.page-about .about-steps p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--about-cream-soft);
}

/* ---------- 团队角色 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: clamp(1.8rem, 5vw, 3rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-roles li {
  border-top: 3px solid var(--ink-green);
  padding-top: 0.85rem;
}

.page-about .about-roles__count {
  display: block;
  font-size: clamp(1.8rem, 6vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  color: var(--wine);
}

.page-about .about-roles h3 {
  margin: 0.45rem 0 0.4rem;
  font-size: 1rem;
  letter-spacing: 0.02em;
}

.page-about .about-roles p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: rgba(11, 43, 38, 0.84);
}

/* ---------- 筛选与时间线 ---------- */
.page-about .about-filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: clamp(1.4rem, 4vw, 2.2rem);
}

.page-about .about-filters .yd-chip {
  font: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  padding: 0.4rem 0.75rem;
  border: 2px solid var(--ink-green);
  background: transparent;
  color: var(--ink-green);
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, box-shadow 0.18s ease;
}

.page-about .about-filters .yd-chip[aria-pressed="true"] {
  background: var(--ink-green);
  color: var(--stand-cream);
  box-shadow: 3px 3px 0 var(--lime);
}

.page-about .about-filters .yd-chip:focus-visible {
  outline: 3px solid var(--whistle);
  outline-offset: 2px;
}

.page-about .about-filters .yd-filter-count {
  font-family: var(--font-num);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: rgba(11, 43, 38, 0.62);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 2rem;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0.4rem;
  top: 0.6rem;
  bottom: 0.6rem;
  width: 3px;
  background: linear-gradient(180deg, var(--lime) 0%, var(--whistle) 48%, var(--indigo) 100%);
}

.page-about .about-node {
  position: relative;
  padding: 0 0 1.75rem;
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -1.86rem;
  top: 0.35rem;
  width: 0.85rem;
  height: 0.85rem;
  background: var(--stand-cream);
  border: 3px solid var(--ink-green);
  transition: background 0.2s ease, transform 0.2s ease;
}

.page-about .about-node:hover::before {
  background: var(--lime);
  transform: scale(1.12);
}

.page-about .about-node[hidden] {
  display: none;
}

.page-about .about-node__phase {
  display: inline-block;
  margin-bottom: 0.5rem;
}

.page-about .about-node h3 {
  margin: 0 0 0.4rem;
  font-size: clamp(1.02rem, 3vw, 1.18rem);
  line-height: 1.45;
  font-weight: 800;
}

.page-about .about-node p {
  margin: 0;
  max-width: 34rem;
  font-size: 0.94rem;
  line-height: 1.82;
  color: rgba(11, 43, 38, 0.84);
}

/* ---------- 合作生态 ---------- */
.page-about .about-coop {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-coop li {
  border: 2px solid var(--about-line-dark);
  background: rgba(7, 17, 31, 0.28);
  padding: 1rem 1.05rem 1.1rem;
}

.page-about .about-coop__num {
  display: block;
  font-size: clamp(1.5rem, 5vw, 2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
}

.page-about .about-coop h3 {
  margin: 0.45rem 0 0.35rem;
  font-size: 1rem;
}

.page-about .about-coop p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: rgba(244, 240, 230, 0.82);
}

/* ---------- 服务信息 ---------- */
.page-about .about-contact {
  margin: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .about-contact div {
  border-bottom: 1px solid var(--about-line-dark);
  padding-bottom: 0.7rem;
}

.page-about .about-contact dt {
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fog);
  margin-bottom: 0.28rem;
}

.page-about .about-contact dd {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.65;
  color: var(--stand-cream);
  word-break: break-word;
}

.page-about .about-contact dd a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(168, 255, 62, 0.5);
}

.page-about .about-contact dd a:hover,
.page-about .about-contact dd a:focus-visible {
  border-bottom-color: var(--lime);
}

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

  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.4rem;
  }

  .page-about .about-coop {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.9rem;
  }

  .page-about .about-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.9rem 1.6rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(2rem, 4vw, 3.4rem);
  }

  .page-about .about-hero__panel {
    margin-top: 1.2rem;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(2rem, 4vw, 3.4rem);
  }

  .page-about .about-split--rev {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-copy {
    padding-top: 0.2rem;
  }

  .page-about .about-node {
    display: grid;
    grid-template-columns: 12rem minmax(0, 1fr);
    column-gap: 1.6rem;
    align-items: start;
    padding-bottom: 2rem;
  }

  .page-about .about-node__phase {
    grid-column: 1;
    justify-self: start;
    margin-bottom: 0;
  }

  .page-about .about-node h3 {
    grid-column: 2;
    margin-top: 0;
  }

  .page-about .about-node p {
    grid-column: 2;
  }
}
<<<END>>>