.page-about {
  --about-line: rgba(42, 133, 121, 0.32);
  --about-line-soft: rgba(42, 133, 121, 0.18);
  --about-card: linear-gradient(160deg, rgba(18, 63, 52, 0.86), rgba(12, 42, 34, 0.94));
  background: var(--c-ink);
  color: var(--c-text);
  font-family: var(--font-body);
  overflow-x: hidden;
  padding-bottom: 8px;
}

.page-about .about-shell {
  width: min(calc(100% - 32px), var(--w-wrap));
  margin: 0 auto;
  padding: 28px 0 64px;
  display: grid;
  gap: 28px;
}

.page-about .about-flow {
  min-width: 0;
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  display: none;
}

.page-about .about-index__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-dim);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--about-line);
}

.page-about .about-index__list li {
  margin: 0;
}

.page-about .about-index__list a {
  display: block;
  padding: 8px 0 8px 13px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  color: var(--c-dim);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  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(--c-amber-soft);
  border-left-color: var(--c-amber);
  outline: none;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 4px 0 34px;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -80px;
  right: -20%;
  width: 78%;
  height: 340px;
  background: radial-gradient(circle at 62% 42%, rgba(232, 177, 75, 0.2), rgba(90, 209, 196, 0.1) 46%, transparent 74%);
  filter: blur(4px);
  pointer-events: none;
  z-index: 0;
}

.page-about .crumbs {
  position: relative;
  z-index: 1;
  margin-bottom: 22px;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 26px;
}

.page-about .about-hero__kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-cyan);
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 6.4vw, 54px);
  line-height: 1.06;
  letter-spacing: -0.012em;
  color: var(--c-text);
  max-width: 18em;
}

.page-about .about-hero__lead .lead {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-dim);
  max-width: 36em;
}

.page-about .about-hero__card {
  padding: 22px 20px;
  border-radius: var(--r-lg);
  border: 1px solid var(--about-line);
  background: var(--grad-card);
  box-shadow: var(--shadow-lift);
}

.page-about .about-hero__note {
  margin: 16px 0 20px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--c-text);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding: 42px 0;
}

.page-about .about-section + .about-section {
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-head {
  max-width: 46em;
  margin-bottom: 26px;
}

.page-about .about-head--flush {
  margin-bottom: 0;
}

.page-about .about-head .section__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 4.6vw, 38px);
  line-height: 1.14;
  letter-spacing: -0.006em;
  color: var(--c-text);
}

.page-about .about-head .section__note {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-dim);
}

.page-about .about-head .pill {
  font-family: var(--font-mono);
}

/* ---------- 三件事 ---------- */
.page-about .about-pillars {
  display: grid;
  gap: 14px;
  margin-bottom: 28px;
}

.page-about .about-pillar {
  position: relative;
  padding: 22px 20px 24px;
  border-radius: var(--r-md);
  border: 1px solid var(--about-line);
  background: var(--about-card);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.page-about .about-pillar:hover {
  transform: translateY(-3px);
  border-color: rgba(232, 177, 75, 0.5);
}

.page-about .about-pillar__num {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-amber);
}

.page-about .about-pillar h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 19px;
  line-height: 1.35;
  color: var(--c-text);
}

.page-about .about-pillar p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--c-dim);
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: 0;
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border-radius: var(--r-lg);
}

.page-about .frame.about-figure--3x2 {
  aspect-ratio: 3 / 2;
}

.page-about .frame.about-figure--16x9 {
  aspect-ratio: 16 / 9;
}

.page-about .frame.about-figure--1x1 {
  aspect-ratio: 1 / 1;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  border-radius: inherit;
}

.page-about .about-figure .frame__cap {
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  color: var(--c-amber-soft);
}

/* ---------- 规模标牌 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .about-stat {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 6px;
  padding: 22px 16px 24px;
  background: linear-gradient(165deg, rgba(12, 42, 34, 0.96), rgba(6, 18, 14, 0.99));
  transition: background 0.2s ease;
}

.page-about .about-stat:hover {
  background: linear-gradient(165deg, rgba(18, 63, 52, 0.96), rgba(12, 42, 34, 0.99));
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 7vw, 36px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-amber);
}

.page-about .about-stat__unit {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-cyan);
}

.page-about .about-stat__label {
  flex-basis: 100%;
  margin-top: 8px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--c-dim);
}

/* ---------- 版本与校验 ---------- */
.page-about .about-verify {
  display: grid;
  gap: 24px;
  align-items: start;
}

.page-about .about-verify .prose p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.84;
  color: var(--c-text);
}

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

.page-about .about-verify .prose a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(90, 209, 196, 0.45);
}

.page-about .about-verify .prose a:hover,
.page-about .about-verify .prose a:focus-visible {
  color: var(--c-amber-soft);
  border-bottom-color: var(--c-amber);
  outline: none;
}

.page-about .about-verify__panel {
  border-radius: var(--r-lg);
  border: 1px solid var(--about-line);
  background: var(--about-card);
  padding: 18px 18px 8px;
}

.page-about .about-verify__panel .panel__head {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-cyan);
}

.page-about .about-verify__panel .panel__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px solid var(--about-line-soft);
}

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

.page-about .about-verify__panel .panel__key {
  font-size: 13.5px;
  color: var(--c-dim);
}

.page-about .about-verify__panel .panel__val {
  font-family: var(--font-mono);
  font-size: 14px;
  text-align: right;
  color: var(--c-amber-soft);
}

/* ---------- 版本演进 ---------- */
.page-about .evolve-top {
  display: grid;
  gap: 24px;
  margin-bottom: 30px;
}

.page-about .evolve__scale {
  display: none;
  width: 100%;
  height: 24px;
}

.page-about .evolve__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .evolve__item {
  position: relative;
  padding: 18px 16px 18px 18px;
  border-radius: var(--r-md);
  border: 1px solid var(--about-line);
  background: rgba(12, 42, 34, 0.72);
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-about .evolve__item:hover,
.page-about .evolve__item:focus-within,
.page-about .evolve__item:focus-visible {
  transform: translateY(-3px);
  border-color: rgba(232, 177, 75, 0.55);
  background: rgba(18, 63, 52, 0.92);
  outline: none;
}

.page-about .evolve__dot {
  display: block;
  width: 11px;
  height: 11px;
  margin-bottom: 14px;
  border-radius: 50%;
  background: var(--c-cyan);
  box-shadow: 0 0 0 4px rgba(90, 209, 196, 0.16);
}

.page-about .evolve__item--current .evolve__dot {
  background: var(--c-tactic);
  box-shadow: 0 0 0 4px rgba(216, 242, 74, 0.18);
}

.page-about .evolve__name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
  line-height: 1.3;
  color: var(--c-text);
}

.page-about .evolve__item--current .evolve__name {
  color: var(--c-tactic);
}

.page-about .evolve__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-dim);
}

.page-about .evolve__notes {
  display: block;
  list-style: none;
  margin: 12px 0 0;
  padding: 12px 0 0;
  border-top: 1px dashed var(--about-line);
}

.page-about .evolve__notes li {
  position: relative;
  margin: 0 0 6px;
  padding-left: 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-text);
}

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

.page-about .evolve__notes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--c-cyan-line);
}

/* ---------- 团队与协作 ---------- */
.page-about .about-team {
  display: grid;
  gap: 26px;
}

.page-about .about-roles {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-role {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 14px 16px;
  border-radius: var(--r-sm);
  border-left: 2px solid var(--c-cyan-line);
  background: rgba(12, 42, 34, 0.6);
}

.page-about .about-role__tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-amber);
}

.page-about .about-role p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-dim);
}

.page-about .about-team .prose p {
  margin: 0 0 15px;
  font-size: 15px;
  line-height: 1.84;
  color: var(--c-text);
}

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

/* ---------- 备案与联系 ---------- */
.page-about .about-reach {
  display: grid;
  gap: 22px;
  padding: 26px 22px;
  border-radius: var(--r-lg);
  border: 1px solid rgba(232, 177, 75, 0.3);
  background: var(--grad-mist);
}

.page-about .about-reach__text {
  margin: 0 0 18px;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--c-text);
}

.page-about .about-reach__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  margin: 0 0 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(234, 241, 238, 0.14);
}

.page-about .about-reach__key {
  font-size: 13px;
  color: var(--c-dim);
}

.page-about .about-reach__val {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--c-amber-soft);
  word-break: break-all;
}

.page-about .about-reach__note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-dim);
}

.page-about .about-reach__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-shell {
    width: min(calc(100% - 48px), var(--w-wrap));
    padding: 36px 0 76px;
  }

  .page-about .about-role {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 14px;
  }
}

@media (min-width: 760px) {
  .page-about .about-pillars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

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

  .page-about .about-stat {
    padding: 24px 18px 26px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    gap: 46px;
    align-items: center;
  }

  .page-about .about-verify {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 42px;
  }

  .page-about .evolve-top {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    gap: 42px;
    align-items: center;
    margin-bottom: 34px;
  }

  .page-about .evolve__scale {
    display: block;
  }

  .page-about .evolve__list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .evolve__notes {
    display: none;
  }

  .page-about .evolve__item:hover .evolve__notes,
  .page-about .evolve__item:focus-within .evolve__notes {
    display: block;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-reach {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 32px 34px;
  }

  .page-about .about-reach__actions {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 56px;
    padding: 46px 0 96px;
  }

  .page-about .about-index {
    display: block;
    position: sticky;
    top: 108px;
    align-self: start;
  }

  .page-about .about-hero {
    padding-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-pillar,
  .page-about .evolve__item,
  .page-about .about-stat {
    transition: none;
  }

  .page-about .about-pillar:hover,
  .page-about .evolve__item:hover,
  .page-about .evolve__item:focus-within {
    transform: none;
  }
}