.page-about {
  --about-hair: rgba(56, 242, 196, 0.18);
  --about-fill: rgba(22, 52, 77, 0.55);
  --about-fill-2: rgba(11, 31, 51, 0.88);
  --about-body: rgba(237, 247, 255, 0.88);
  color: var(--paper);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 44px 0 52px;
  border-bottom: 1px solid var(--ink-600);
  background:
    radial-gradient(120% 90% at 92% -10%, rgba(56, 242, 196, 0.18), transparent 62%),
    linear-gradient(180deg, var(--ink-800), var(--ink-900));
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(to right, rgba(56, 242, 196, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(56, 242, 196, 0.07) 1px, transparent 1px);
  background-size: 72px 72px;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 28px;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(30px, 8.4vw, 60px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.04em;
  color: var(--paper);
  max-width: 18ch;
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-hero__panel {
  border: 2px solid var(--mint);
  background: rgba(6, 17, 31, 0.9);
  box-shadow: var(--shadow-hard);
  padding: 18px;
}

.page-about .about-hero__panel-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--mint);
}

.page-about .about-metrics {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .about-metrics__item {
  border-left: 2px solid var(--ink-600);
  padding-left: 10px;
}

.page-about .about-metrics__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 6vw, 34px);
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--mint);
  font-variant-numeric: tabular-nums;
}

.page-about .about-metrics__plus {
  font-size: 0.56em;
  color: var(--mint-soft);
  margin-left: 2px;
}

.page-about .about-metrics__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

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

/* ============ 章节索引 ============ */
.page-about .about-index {
  background: var(--ink-800);
  border-bottom: 1px solid var(--ink-700);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 12px 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--ink-600);
  color: var(--paper);
  text-decoration: none;
  white-space: nowrap;
  font-size: 14px;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-color: var(--mint);
  color: var(--mint);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mint);
}

/* ============ 章节通用 ============ */
.page-about .about-section {
  padding: 52px 0;
  border-bottom: 1px solid rgba(42, 74, 102, 0.6);
}

.page-about .about-section--alt {
  background: linear-gradient(180deg, rgba(11, 31, 51, 0.6), rgba(6, 17, 31, 0.15));
}

.page-about .about-head {
  display: grid;
  gap: 8px;
  padding-left: 16px;
  border-left: 4px solid var(--mint);
  margin-bottom: 28px;
}

.page-about .about-head__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--mint);
}

.page-about .about-head__title {
  margin: 0;
  font-size: clamp(23px, 4.8vw, 40px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.page-about .about-head__note {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}

/* ============ 01 定位 ============ */
.page-about .about-lead {
  display: grid;
  gap: 24px;
}

.page-about .about-lead__figure {
  margin: 0;
  border: 2px solid var(--ink-600);
  background: var(--ink-800);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .about-lead__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 4;
  object-fit: cover;
}

.page-about .about-lead__figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--ink-700);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .about-lead__body p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-body);
}

.page-about .about-claims {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-claims li {
  padding: 12px 14px;
  border-left: 3px solid var(--ink-600);
  background: var(--about-fill);
  font-size: 15px;
  line-height: 1.7;
  color: var(--about-body);
}

.page-about .about-claims strong {
  color: var(--mint);
  margin-right: 4px;
}

/* ============ 02 版本演进 ============ */
.page-about .about-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 22px;
}

.page-about .about-filter__count {
  margin: 0 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-filter__count span {
  color: var(--mint);
  font-size: 14px;
}

.page-about .about-timeline {
  display: grid;
  gap: 18px;
}

.page-about .about-era {
  padding: 20px;
  border-left: 4px solid var(--ink-600);
  background: var(--about-fill-2);
}

.page-about .about-era[data-tag="v4"] {
  border-left-color: var(--mint);
}

.page-about .about-era__year {
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--mint);
  font-variant-numeric: tabular-nums;
}

.page-about .about-era__meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 10px 0 10px;
}

.page-about .about-era__meta h3 {
  margin: 0;
  font-size: 19px;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-era p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .about-era__list {
  margin: 12px 0 0;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.9;
  color: var(--muted);
}

/* ============ 03 内容与数据 ============ */
.page-about .about-produce {
  display: grid;
  gap: 24px;
}

.page-about .about-steps {
  list-style: none;
  counter-reset: about-step;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-steps li {
  position: relative;
  padding: 16px 16px 16px 58px;
  border: 1px solid var(--ink-600);
  background: var(--about-fill);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-steps li:hover {
  border-color: var(--mint);
  transform: translateX(3px);
}

.page-about .about-steps li::before {
  counter-increment: about-step;
  content: "0" counter(about-step);
  position: absolute;
  left: 14px;
  top: 15px;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--mint);
}

.page-about .about-steps h3 {
  margin: 0 0 6px;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--paper);
}

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

.page-about .about-produce__figure {
  margin: 0;
  border: 2px solid var(--ink-600);
  background: var(--ink-800);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
  align-self: start;
}

.page-about .about-produce__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
}

.page-about .about-produce__figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--ink-700);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
}

.page-about .about-statrow {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ink-600);
  border: 1px solid var(--ink-600);
}

.page-about .about-stat {
  background: var(--ink-900);
  padding: 16px 14px;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--mint);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

/* ============ 04 团队与服务 ============ */
.page-about .about-team {
  display: grid;
  gap: 26px;
}

.page-about .about-bars {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-about .about-bar {
  display: grid;
  gap: 7px;
}

.page-about .about-bar__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  font-size: 14px;
  color: var(--paper);
}

.page-about .about-bar__hint {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--muted);
  opacity: 0.75;
  transition: color 0.25s var(--ease), opacity 0.25s var(--ease);
}

.page-about .about-bar:hover .about-bar__hint {
  color: var(--mint);
  opacity: 1;
}

.page-about .about-bar__track {
  height: 14px;
  background: var(--ink-700);
  border: 1px solid var(--ink-600);
}

.page-about .about-bar__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--mint), var(--mint-soft));
}

.page-about .about-bar__fill--c1 { width: 35.3%; }
.page-about .about-bar__fill--c2 { width: 23.5%; }
.page-about .about-bar__fill--c3 { width: 17.6%; }

.page-about .about-bars__note {
  margin: 4px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-service {
  border: 2px solid var(--mint);
  background: var(--about-fill-2);
  box-shadow: var(--shadow-hard);
  padding: 20px;
}

.page-about .about-service h3 {
  margin: 0 0 14px;
  font-size: 18px;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-facts {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--ink-600);
  border: 1px solid var(--ink-600);
}

.page-about .about-facts__row {
  display: grid;
  gap: 2px;
  padding: 10px 12px;
  background: var(--ink-900);
}

.page-about .about-facts dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-facts dd {
  margin: 0;
  font-size: 15px;
  color: var(--paper);
  word-break: break-word;
}

.page-about .about-facts dd.data-num {
  font-family: var(--font-mono);
  color: var(--mint);
  letter-spacing: 0.02em;
}

.page-about .about-service__note {
  margin: 14px 0 12px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

/* ============ 05 资质与合作 ============ */
.page-about .about-cred {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ink-600);
  border: 1px solid var(--ink-600);
}

.page-about .about-cred__item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 12px;
  padding: 18px 16px;
  background: var(--ink-800);
}

.page-about .about-cred__num {
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1.1;
  color: var(--mint);
  letter-spacing: -0.02em;
}

.page-about .about-cred__item h3 {
  margin: 0 0 6px;
  font-size: 16px;
  letter-spacing: -0.01em;
  color: var(--paper);
}

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

/* ============ 06 适合谁用 ============ */
.page-about .about-audience {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-aud {
  border: 2px solid var(--ink-600);
  background: linear-gradient(160deg, rgba(22, 52, 77, 0.75), rgba(6, 17, 31, 0.92));
  padding: 20px;
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-aud:hover {
  transform: translateY(-4px);
  border-color: var(--mint);
}

.page-about .about-aud__title {
  margin: 12px 0 8px;
  font-size: 18px;
  line-height: 1.35;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-aud p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-body);
}

/* ============ 结尾行动 ============ */
.page-about .about-cta {
  padding: 52px 0 68px;
  border-top: 1px solid var(--ink-600);
  background:
    linear-gradient(120deg, rgba(56, 242, 196, 0.16), transparent 58%),
    var(--ink-800);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 14px;
}

.page-about .about-cta h2 {
  margin: 0;
  font-size: clamp(24px, 5.2vw, 38px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

/* ============ 响应式 ============ */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 60px 0 68px;
  }

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

  .page-about .about-section {
    padding: 64px 0;
  }

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

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

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

  .page-about .about-facts__row {
    grid-template-columns: 110px minmax(0, 1fr);
    align-items: baseline;
    gap: 12px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.72fr);
    align-items: end;
    gap: 42px;
  }

  .page-about .about-hero__panel {
    transform: translateY(-16px);
  }

  .page-about .about-lead {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }

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

  .page-about .about-era:nth-child(even) {
    transform: translateY(22px);
  }

  .page-about .about-produce {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .about-head {
    grid-template-columns: minmax(0, 1fr);
    margin-bottom: 34px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__note {
    display: block;
    position: absolute;
    top: 108px;
    right: 14px;
    z-index: 2;
    margin: 0;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.28em;
    color: rgba(143, 255, 227, 0.7);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-steps li,
  .page-about .about-aud,
  .page-about .about-bar__hint,
  .page-about .about-index__link {
    transition: none;
  }

  .page-about .about-era:nth-child(even),
  .page-about .about-hero__panel {
    transform: none;
  }

  .page-about .about-aud:hover,
  .page-about .about-steps li:hover {
    transform: none;
  }
}