.page-about {
  --about-rule: rgba(154, 165, 160, 0.26);
  --about-ink-soft: rgba(26, 22, 19, 0.66);
  --about-cream-rule: rgba(26, 22, 19, 0.12);
  background: var(--c-pitch-deep);
  color: var(--c-white);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb-wrap {
  padding-block: 1.5rem 0.75rem;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: var(--ls-label);
  text-transform: uppercase;
  color: var(--c-gray);
}

.page-about .about-crumb-wrap .shell {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.page-about .about-crumb-wrap a {
  color: var(--c-gray);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-crumb-wrap a:hover {
  color: var(--c-flare);
  border-bottom-color: var(--c-flare);
}

.page-about .about-crumb-wrap [aria-current="page"] {
  color: var(--c-white);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(1.5rem, 4vw, 2.5rem) clamp(3rem, 7vw, 5.5rem);
  background:
    radial-gradient(120% 90% at 88% 4%, rgba(255, 106, 26, 0.22), transparent 58%),
    linear-gradient(172deg, #0B2E20 0%, #08251A 46%, #10402D 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(102deg, rgba(244, 240, 230, 0.035) 0 2px, transparent 2px 26px);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(2rem, 6vw, 3.5rem);
  align-items: end;
}

.page-about .about-hero__title {
  margin: 0.75rem 0 1.1rem;
  font-family: var(--font-sans);
  font-size: clamp(2.15rem, 6.4vw, 4.3rem);
  font-weight: 900;
  line-height: var(--lh-tight);
  letter-spacing: -0.01em;
  color: var(--c-white);
  text-wrap: balance;
}

.page-about .about-hero__lede {
  max-width: 56ch;
  margin: 0 0 2rem;
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  line-height: var(--lh-body);
  color: rgba(244, 240, 230, 0.86);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: var(--ls-data);
  color: var(--c-flare);
}

.page-about .about-fact__label {
  display: block;
  margin-top: 0.45rem;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: var(--ls-label);
  text-transform: uppercase;
  color: var(--c-gray);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
}

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  top: -0.7rem;
  right: -0.7rem;
  width: 38%;
  height: 38%;
  border-top: 3px solid var(--c-flare);
  border-right: 3px solid var(--c-flare);
  border-radius: 0 var(--radius-lg) 0 0;
  opacity: 0.7;
  pointer-events: none;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 4;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

/* ---------- 通用区头 ---------- */
.page-about .about-head {
  max-width: 62ch;
}

.page-about .about-head h2 {
  margin: 0.55rem 0 0.9rem;
  font-family: var(--font-sans);
  font-size: clamp(1.7rem, 3.8vw, 2.6rem);
  font-weight: 800;
  line-height: var(--lh-tight);
  letter-spacing: -0.005em;
}

.page-about .about-head__text {
  margin: 0;
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--about-ink-soft);
}

.page-about .about-evo .eyebrow,
.page-about .about-rulebook .eyebrow,
.page-about .about-team .eyebrow,
.page-about .about-scenes .eyebrow {
  color: var(--c-pitch);
}

/* ---------- 演进时间轴 ---------- */
.page-about .about-evo {
  padding-block: clamp(3rem, 7vw, 5.5rem);
  background: var(--c-cream);
  color: var(--c-brown);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.page-about .about-evo__grid {
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
}

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

.page-about .about-evo__list::before {
  content: "";
  position: absolute;
  left: 0.68rem;
  top: 2.2rem;
  bottom: 2rem;
  width: 2px;
  background: linear-gradient(180deg, var(--c-flare), rgba(45, 212, 191, 0.85));
  opacity: 0.5;
}

.page-about .about-evo__item {
  position: relative;
  display: grid;
  gap: 0.35rem 1.75rem;
  padding: 1.4rem 0 1.4rem 2.2rem;
  border-bottom: 1px solid var(--about-cream-rule);
}

.page-about .about-evo__item:last-child {
  border-bottom: 0;
}

.page-about .about-evo__item::before {
  content: "";
  position: absolute;
  left: 0.4rem;
  top: 1.85rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--c-flare);
  box-shadow: 0 0 0 4px rgba(255, 106, 26, 0.18);
}

.page-about .about-evo__year {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: var(--ls-data);
  color: var(--c-flare);
}

.page-about .about-evo__title {
  margin: 0 0 0.45rem;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--c-brown);
}

.page-about .about-evo__body p {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  line-height: var(--lh-body);
  color: var(--about-ink-soft);
}

.page-about .about-evo__body .tag-row {
  margin-bottom: 0;
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-scope {
  padding-block: clamp(3rem, 7vw, 5.5rem);
  background: var(--c-pitch-deep);
  color: var(--c-white);
}

.page-about .about-scope .eyebrow {
  color: var(--c-teal);
}

.page-about .about-scope .about-head__text {
  color: rgba(244, 240, 230, 0.78);
}

.page-about .about-groups {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(2rem, 4vw, 3rem) 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-group {
  display: grid;
  gap: 0.5rem;
  padding: 1.4rem 1.3rem;
  background: var(--c-pitch);
}

.page-about .about-group__name {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: var(--ls-label);
  text-transform: uppercase;
  color: var(--c-flare);
}

.page-about .about-group__desc {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.7;
  color: rgba(244, 240, 230, 0.8);
}

.page-about .about-scope__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem 1.25rem;
  margin-top: clamp(2rem, 4vw, 2.75rem);
  padding-top: clamp(1.5rem, 3vw, 2rem);
  border-top: 1px solid var(--about-rule);
}

.page-about .about-scope__stats .metric-label {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: var(--ls-label);
  text-transform: uppercase;
  color: var(--c-gray);
}

.page-about .about-scope__stats .metric-value {
  display: block;
  margin-top: 0.4rem;
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 4.5vw, 2.9rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: var(--ls-data);
  color: var(--c-white);
}

/* ---------- 核算口径 ---------- */
.page-about .about-rulebook {
  padding-block: clamp(3rem, 7vw, 5.5rem);
  background: var(--c-cream);
  color: var(--c-brown);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.page-about .about-rules {
  display: grid;
  gap: 1.1rem;
  margin: clamp(2rem, 4vw, 2.75rem) 0 0;
  padding: 0;
  list-style: none;
  counter-reset: rule;
}

.page-about .about-rule {
  position: relative;
  padding: 1.35rem 1.35rem 1.35rem 3.4rem;
  background: var(--c-white);
  border: 1px solid var(--about-cream-rule);
  border-left: 3px solid var(--c-flare);
  border-radius: var(--radius-sm) var(--radius-md) var(--radius-md) var(--radius-sm);
}

.page-about .about-rule::before {
  counter-increment: rule;
  content: counter(rule, decimal-leading-zero);
  position: absolute;
  left: 1.1rem;
  top: 1.45rem;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: var(--ls-data);
  color: var(--c-flare);
}

.page-about .about-rule__title {
  margin: 0 0 0.45rem;
  font-size: 1.08rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--c-brown);
}

.page-about .about-rule p {
  margin: 0;
  font-size: 0.98rem;
  line-height: var(--lh-body);
  color: var(--about-ink-soft);
}

/* ---------- 团队与协作 ---------- */
.page-about .about-team {
  padding-block: clamp(3rem, 7vw, 5.5rem);
  background: var(--c-cream);
  color: var(--c-brown);
  border-top: 1px solid var(--about-cream-rule);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
}

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

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.page-about .about-units {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-cream-rule);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-unit {
  padding: 1.1rem 1.2rem;
  background: var(--c-cream);
}

.page-about .about-unit__name {
  display: block;
  margin-bottom: 0.4rem;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: var(--ls-label);
  text-transform: uppercase;
  color: var(--c-pitch);
}

.page-about .about-unit p {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.7;
  color: var(--about-ink-soft);
}

.page-about .about-team__note {
  margin: 1.75rem 0 0;
  padding-left: 1.1rem;
  border-left: 2px solid var(--c-teal);
  font-size: 0.96rem;
  line-height: var(--lh-body);
  color: var(--about-ink-soft);
}

/* ---------- 使用场景 ---------- */
.page-about .about-scenes {
  padding-block: clamp(3rem, 7vw, 5.5rem) clamp(3.5rem, 8vw, 6rem);
  background: var(--c-cream);
  color: var(--c-brown);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.page-about .about-scenes__top {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.5rem);
}

.page-about .about-scenes__figure {
  margin: 0;
}

.page-about .about-scenes__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.page-about .about-scenes .filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  padding-bottom: 1.1rem;
  border-bottom: 1px solid var(--about-cream-rule);
}

.page-about .filter-btn {
  appearance: none;
  padding: 0.48rem 0.9rem;
  border: 1px solid rgba(26, 22, 19, 0.22);
  border-radius: 999px;
  background: transparent;
  color: var(--c-brown);
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: var(--ls-label);
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-about .filter-btn:hover {
  border-color: var(--c-flare);
  color: var(--c-flare);
}

.page-about .filter-btn[data-filter-default] {
  background: var(--c-brown);
  border-color: var(--c-brown);
  color: var(--c-cream);
}

.page-about .filter-count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: var(--ls-label);
  text-transform: uppercase;
  color: var(--about-ink-soft);
}

.page-about .about-archive {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.1rem;
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about [data-filtered-out] {
  display: none !important;
}

.page-about .about-file {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  padding: 1.35rem 1.3rem 1.45rem;
  background: var(--c-white);
  border: 1px solid var(--about-cream-rule);
  border-top: 3px solid var(--c-pitch);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-top-color 0.25s ease;
}

.page-about .about-file:hover {
  transform: translateY(-4px) rotate(-0.4deg);
  border-top-color: var(--c-flare);
  box-shadow: 0 20px 36px -24px rgba(11, 46, 32, 0.6);
}

.page-about .about-file .chip {
  align-self: flex-start;
}

.page-about .about-file__title {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--c-brown);
}

.page-about .about-file p {
  margin: 0;
  font-size: 0.96rem;
  line-height: var(--lh-body);
  color: var(--about-ink-soft);
}

.page-about .about-file__link {
  margin-top: auto;
  align-self: flex-start;
  font-size: 0.9rem;
}

/* ---------- 页尾索引 ---------- */
.page-about .about-map {
  padding-block: clamp(3rem, 7vw, 5rem);
  background: var(--c-pitch-deep);
  color: var(--c-white);
}

.page-about .about-map .eyebrow {
  color: var(--c-teal);
}

.page-about .about-map h2 {
  margin: 0.55rem 0 1.5rem;
  font-family: var(--font-sans);
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  font-weight: 800;
  line-height: var(--lh-tight);
  color: var(--c-white);
}

.page-about .about-map__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-map__list a {
  display: block;
  padding: 1rem 1.2rem;
  background: var(--c-pitch);
  color: var(--c-white);
  font-size: 0.98rem;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease, padding-left 0.2s ease;
}

.page-about .about-map__list a:hover {
  background: var(--c-flare);
  color: var(--c-pitch-deep);
  padding-left: 1.6rem;
}

.page-about .about-map__note {
  max-width: 68ch;
  margin: 1.75rem 0 0;
  padding-left: 1.1rem;
  border-left: 2px solid var(--c-flare);
  font-size: 0.94rem;
  line-height: var(--lh-body);
  color: rgba(244, 240, 230, 0.76);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 760px) {
  .page-about .about-groups {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-evo__item {
    grid-template-columns: 6rem minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-evo__item::before {
    top: 2rem;
  }

  .page-about .about-rules {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.25rem 1.5rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-scenes__top {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-evo__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

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

@media (min-width: 1080px) {
  .page-about .about-groups {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-file,
  .page-about .filter-btn,
  .page-about .about-map__list a {
    transition: none;
  }

  .page-about .about-file:hover {
    transform: none;
  }
}