.page-about {
  --about-rule: rgba(244, 240, 230, 0.16);
  --about-soft: rgba(244, 240, 230, 0.06);
  --about-glow: rgba(41, 242, 207, 0.12);
  color: var(--paper);
  background:
    radial-gradient(120% 70% at 82% -12%, var(--about-glow), transparent 62%),
    linear-gradient(180deg, var(--ink) 0%, var(--ink) 46%, var(--night) 100%);
  overflow-x: hidden;
}

.page-about .about-crumb {
  padding-top: 1rem;
  padding-bottom: 0.5rem;
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4.6vw, 2.5rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.01em;
  margin: 0.6rem 0 1.2rem;
  max-width: 22em;
}

.page-about .about-p {
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(244, 240, 230, 0.82);
  max-width: 34em;
  margin: 0 0 1rem;
}

/* ---------- 首屏：文字建筑 + 侧图 ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
  padding-top: 1rem;
  padding-bottom: clamp(2rem, 6vw, 4rem);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 8vw, 4.4rem);
  font-weight: 200;
  line-height: 1.06;
  letter-spacing: -0.025em;
  margin: 0.8rem 0 1.1rem;
  max-width: 14em;
}

.page-about .about-hero__title b {
  font-weight: 500;
  color: var(--cyan);
}

.page-about .about-hero__lede {
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(244, 240, 230, 0.8);
  max-width: 32em;
  margin: 0 0 1.6rem;
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 0;
  list-style: none;
  margin: 0;
  padding: 1rem 0 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-fact {
  flex: 1 1 8rem;
  min-width: 0;
  padding-right: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.page-about .about-fact__n {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .about-fact__k {
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-hero__figure {
  margin: 0;
  border-top: 2px solid var(--orange);
  padding-top: 0.5rem;
}

/* ---------- 使命陈述 ---------- */
.page-about .about-creed {
  border-top: 1px solid var(--about-rule);
}

.page-about .about-creed__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2.25rem;
}

.page-about .about-creed__line {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 6.4vw, 3.4rem);
  font-weight: 200;
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0 0 0.35rem;
  color: rgba(244, 240, 230, 0.55);
}

.page-about .about-creed__line b {
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-creed__line:nth-child(2) b { color: var(--cyan); }
.page-about .about-creed__line:nth-child(3) b { color: var(--orange); }

.page-about .about-creed__body {
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(244, 240, 230, 0.78);
  max-width: 34em;
  margin: 1.35rem 0 0;
}

.page-about .about-index {
  border-top: 1px solid var(--cyan-line);
  padding-top: 0.75rem;
}

.page-about .about-index__title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  color: var(--mist);
  margin: 0 0 0.6rem;
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1rem;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  font-size: 0.85rem;
  color: rgba(244, 240, 230, 0.78);
  text-decoration: none;
  padding: 0.25rem 0;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

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

.page-about .about-index__code {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--orange);
}

.page-about .about-note {
  margin-top: 1.5rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--about-rule);
  background: var(--deck);
  box-shadow: 4px 4px 0 rgba(3, 7, 13, 0.55);
}

.page-about .about-note__k {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
  margin: 0 0 0.4rem;
}

.page-about .about-note__v {
  font-size: 0.85rem;
  line-height: 1.75;
  color: rgba(244, 240, 230, 0.76);
  margin: 0;
}

/* ---------- 服务对象 ---------- */
.page-about .about-audience {
  border-top: 1px solid var(--about-rule);
  background: linear-gradient(180deg, transparent, var(--about-soft));
}

.page-about .about-aud__grid {
  gap: 1rem;
}

.page-about .about-aud {
  position: relative;
  padding: 1.2rem 1.15rem 1.1rem;
  background: var(--deck);
  border: 1px solid var(--about-rule);
  border-left: 2px solid var(--laterite);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.page-about .about-aud:hover,
.page-about .about-aud:focus-within {
  transform: translateY(-3px);
  border-color: var(--cyan-line);
}

.page-about .about-aud__num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--orange);
  margin: 0 0 0.5rem;
}

.page-about .about-aud__title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 800;
  margin: 0 0 0.5rem;
  color: var(--paper);
}

.page-about .about-aud__text {
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(244, 240, 230, 0.76);
  margin: 0 0 0.9rem;
}

.page-about .about-aud__tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
}

/* ---------- 数据与内容 ---------- */
.page-about .about-system {
  border-top: 1px solid var(--about-rule);
}

.page-about .about-system__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
}

.page-about .about-system__figure {
  margin: 0;
  border: 1px solid var(--about-rule);
  padding: 0.5rem;
  background: rgba(11, 30, 54, 0.7);
}

.page-about .about-system__stats {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.85rem;
}

.page-about .about-stat {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--about-rule);
  background: rgba(16, 43, 74, 0.6);
  transition: border-color 0.18s ease, background 0.18s ease;
}

.page-about .about-stat:hover {
  border-color: var(--cyan-line);
  background: var(--deck);
}

.page-about .about-stat__n {
  font-family: var(--font-mono);
  font-size: 1.9rem;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-stat__d {
  font-size: 0.85rem;
  line-height: 1.6;
  color: rgba(244, 240, 230, 0.76);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  border-top: 1px solid var(--about-rule);
  background:
    linear-gradient(120deg, rgba(180, 81, 46, 0.16) 0%, transparent 38%),
    linear-gradient(180deg, var(--night), var(--ink));
}

.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.1rem;
  position: relative;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 0.28rem;
  top: 0.4rem;
  bottom: 0.4rem;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(41, 242, 207, 0.15) 70%, transparent);
}

.page-about .about-tl__item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.4rem;
  padding: 0 0 1.75rem 0.4rem;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -1.02rem;
  top: 0.45rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--cyan);
  transition: background 0.18s ease, transform 0.18s ease;
}

.page-about .about-tl__item:hover::before,
.page-about .about-tl__item:focus-within::before {
  background: var(--orange);
  border-color: var(--orange);
  transform: scale(1.25);
}

.page-about .about-tl__year {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  line-height: 1;
  color: var(--orange);
  letter-spacing: -0.02em;
  margin: 0;
}

.page-about .about-tl__title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 800;
  margin: 0.25rem 0 0.4rem;
  color: var(--paper);
}

.page-about .about-tl__text {
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(244, 240, 230, 0.76);
  margin: 0 0 0.45rem;
  max-width: 34em;
}

.page-about .about-tl__note {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--mist);
  margin: 0;
  opacity: 0;
  transform: translateY(-3px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.page-about .about-tl__item:hover .about-tl__note,
.page-about .about-tl__item:focus-within .about-tl__note {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 团队与共创 ---------- */
.page-about .about-team {
  border-top: 1px solid var(--about-rule);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
}

.page-about .about-team__figure {
  margin: 0 0 1.2rem;
}

.page-about .about-groups {
  list-style: none;
  margin: 1.25rem 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.75rem;
}

.page-about .about-group {
  padding: 0.9rem 1rem;
  border: 1px solid var(--about-rule);
  border-top: 2px solid var(--tag);
  background: rgba(16, 43, 74, 0.55);
  transition: transform 0.2s ease, border-top-color 0.2s ease;
}

.page-about .about-group:hover,
.page-about .about-group:focus-within {
  transform: translateY(-2px);
  border-top-color: var(--cyan);
}

.page-about .about-group__title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 800;
  margin: 0 0 0.35rem;
  color: var(--paper);
}

.page-about .about-group__text {
  font-size: 0.85rem;
  line-height: 1.75;
  color: rgba(244, 240, 230, 0.74);
  margin: 0;
}

.page-about .about-partners {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.55rem;
}

.page-about .about-partner {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.55rem 0.75rem;
  border-left: 2px solid var(--laterite);
  background: rgba(11, 30, 54, 0.75);
}

.page-about .about-partner__n {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--paper);
  min-width: 2.4em;
}

.page-about .about-partner__k {
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 服务原则 ---------- */
.page-about .about-principles {
  border-top: 1px solid var(--about-rule);
  background: linear-gradient(180deg, var(--ink), var(--night));
}

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

.page-about .about-prin {
  padding: 1.1rem 1rem;
  border: 1px solid var(--about-rule);
  background: rgba(16, 43, 74, 0.42);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .about-prin:hover,
.page-about .about-prin:focus-within {
  border-color: var(--cyan-line);
  transform: translateY(-3px);
}

.page-about .about-prin__code {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--orange);
  margin: 0 0 0.5rem;
}

.page-about .about-prin__title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 800;
  margin: 0 0 0.45rem;
  color: var(--paper);
}

.page-about .about-prin__text {
  font-size: 0.88rem;
  line-height: 1.78;
  color: rgba(244, 240, 230, 0.76);
  margin: 0;
}

.page-about .about-links {
  margin-top: 1.75rem;
  padding: 1.15rem 1.1rem 1.25rem;
  border: 1px solid var(--about-rule);
  background: var(--deck);
  box-shadow: 5px 5px 0 rgba(3, 7, 13, 0.5);
}

.page-about .about-links__title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 800;
  margin: 0 0 0.85rem;
  color: var(--paper);
}

.page-about .about-links__row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.page-about .about-links__row .btn {
  flex: 0 1 auto;
}

.page-about .about-links__note {
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--mist);
  margin: 0.9rem 0 0;
}

.page-about .about-links__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-line);
}

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

.page-about .figure__frame img,
.page-about .about-hero__figure img,
.page-about .about-system__figure img,
.page-about .about-team__figure img {
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 760px) {
  .page-about .about-aud__grid,
  .page-about .about-prin__grid,
  .page-about .about-groups,
  .page-about .about-system__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-tl__item {
    grid-template-columns: 8rem minmax(0, 1fr);
    gap: 1.25rem;
  }

  .page-about .about-tl__year {
    font-size: 1.9rem;
    text-align: right;
    padding-right: 0.5rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, 0.82fr);
    gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
  }

  .page-about .about-hero__figure {
    position: sticky;
    top: 6.5rem;
  }

  .page-about .about-creed__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    gap: clamp(2rem, 6vw, 5rem);
    align-items: start;
  }

  .page-about .about-creed__side {
    position: sticky;
    top: 6.5rem;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 0.15rem;
  }

  .page-about .about-system__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: clamp(2rem, 5vw, 3.5rem);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(2rem, 5vw, 3.5rem);
  }

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

  .page-about .about-principles {
    padding-bottom: clamp(3rem, 7vw, 5rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-aud,
  .page-about .about-stat,
  .page-about .about-group,
  .page-about .about-prin,
  .page-about .about-tl__item::before,
  .page-about .about-tl__note {
    transition: none;
  }

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