/* ===== 品牌档案 · page-about 专属样式 ===== */
.page-about {
  --about-line: rgba(160, 211, 255, 0.16);
  --about-line-weak: rgba(160, 211, 255, 0.07);
  --about-chip: rgba(57, 255, 20, 0.08);
  --about-text-mid: #C7D3E8;
  background: var(--bg-deep);
  color: var(--white);
  overflow-x: hidden;
}

/* ---------- 首屏框景 ---------- */
.page-about .page-hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 82% 18%, rgba(57, 255, 20, 0.1), transparent 48%),
    linear-gradient(135deg, var(--bg-ink) 0%, var(--bg-deep) 70%, var(--bg-deep) 100%);
}

.page-about .page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--about-line-weak) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-line-weak) 1px, transparent 1px);
  background-size: 2.75rem 2.75rem;
  -webkit-mask-image: linear-gradient(180deg, transparent 0%, #000 30%, #000 70%, transparent 100%);
  mask-image: linear-gradient(180deg, transparent 0%, #000 30%, #000 70%, transparent 100%);
  pointer-events: none;
}

.page-about .page-hero::after {
  content: "";
  position: absolute;
  top: 2rem;
  right: -4rem;
  width: 22rem;
  height: 140%;
  background: var(--neon);
  opacity: 0.05;
  transform: rotate(22deg);
  pointer-events: none;
}

.page-about .page-hero__inner {
  position: relative;
  padding-top: calc(var(--header-h) + 3.75rem);
  padding-bottom: 3rem;
}

.page-about .page-hero__grid {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  margin-top: 1.5rem;
}

.page-about .page-hero__copy .eyebrow {
  color: var(--neon);
}

.page-about .page-hero__copy .lead {
  max-width: 42rem;
  margin-top: 1.25rem;
  color: var(--about-text-mid);
}

.page-about .page-hero__badge {
  align-self: flex-start;
  display: inline-flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.9rem 1.1rem;
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--neon);
  background: rgba(11, 21, 38, 0.7);
  clip-path: polygon(0 0, 100% 0, calc(100% - 0.75rem) 100%, 0 100%);
}

.page-about .page-hero__badge-version {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--neon);
}

.page-about .page-hero__badge-label {
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .page-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin: 2.25rem 0 0;
  padding: 1.25rem;
  border: 1px solid var(--about-line);
  background: rgba(5, 7, 13, 0.45);
}

.page-about .page-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  margin: 0;
  padding: 0.75rem;
  border-left: 2px solid var(--neon);
  background: rgba(57, 255, 20, 0.04);
}

.page-about .page-hero__stat-num {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--neon);
}

.page-about .page-hero__stat-label {
  margin: 0;
  font-size: 0.8rem;
  color: var(--muted);
}

/* ---------- 主体布局 ---------- */
.page-about .page-about__layout {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  padding-top: 3rem;
  padding-bottom: 5rem;
}

/* 锚点侧栏 */
.page-about .page-about__anchors {
  border: 1px solid var(--about-line);
  background: rgba(5, 7, 13, 0.35);
  padding: 1.25rem 1.25rem 1.5rem;
}

.page-about .page-about__anchors-head {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.page-about .page-about__anchors-title {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-about .page-about__anchors-line {
  flex: 1;
  height: 1px;
  background: var(--about-line);
}

.page-about .page-about__anchors-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.page-about .page-about__anchors-link {
  display: inline-block;
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--about-line);
  border-radius: 999px;
  font-size: 0.85rem;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .page-about__anchors-link:hover,
.page-about .page-about__anchors-link:focus-visible {
  color: var(--white);
  border-color: var(--neon);
  background: var(--about-chip);
  outline: none;
}

.page-about .page-about__anchors-note {
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px dashed var(--about-line);
}

.page-about .page-about__anchors-note p {
  margin: 0 0 0.75rem;
  font-size: 0.85rem;
  color: var(--about-text-mid);
}

/* ---------- 章节通用 ---------- */
.page-about .page-about__content {
  display: flex;
  flex-direction: column;
  gap: 4rem;
}

.page-about .page-about__section {
  scroll-margin-top: calc(var(--header-h) + 1.5rem);
}

.page-about .page-about__section:focus {
  outline: 2px solid var(--neon);
  outline-offset: 4px;
  border-radius: var(--radius);
}

.page-about .page-about__section-head {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.75rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--about-line);
}

.page-about .page-about__section-num {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1;
  color: var(--neon);
  padding-top: 0.2rem;
}

.page-about .page-about__section-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 900;
  line-height: 1.15;
  color: var(--white);
}

.page-about .page-about__section-sub {
  margin: 0.3rem 0 0;
  font-size: 0.85rem;
  color: var(--muted);
}

/* ---------- 01 我们是谁 ---------- */
.page-about .page-about__who-grid {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.page-about .page-about__who-copy p {
  margin: 0 0 1rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--about-text-mid);
}

.page-about .page-about__who-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

.page-about .page-about__who-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--about-line-weak);
  background: rgba(160, 211, 255, 0.04);
  clip-path: polygon(0 0, calc(100% - 0.5rem) 0, 100% 0.5rem, 100% 100%, 0 100%);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .page-about__who-list li:hover {
  border-color: var(--neon);
  background: rgba(57, 255, 20, 0.06);
}

.page-about .page-about__who-term {
  font-size: 0.85rem;
  color: var(--muted);
}

.page-about .page-about__who-desc {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--white);
}

/* ---------- 02 数据理念 ---------- */
.page-about .page-about__data-grid {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.page-about .page-about__data-copy p {
  margin: 0 0 1rem;
  line-height: 1.85;
  color: var(--about-text-mid);
}

.page-about .page-about__data-points {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
}

.page-about .page-about__data-points li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.7rem 0.9rem;
  border-left: 2px solid var(--neon);
  background: rgba(57, 255, 20, 0.05);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--white);
}

.page-about .page-about__data-figure {
  margin: 0;
}

/* ---------- 03 发展里程碑 ---------- */
.page-about .page-about__timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .page-about__timeline::before {
  content: "";
  position: absolute;
  left: 0.85rem;
  top: 0.4rem;
  bottom: 0.4rem;
  width: 1px;
  background: linear-gradient(180deg, var(--neon) 0%, var(--about-line) 30%, var(--about-line) 100%);
  opacity: 0.7;
}

.page-about .page-about__timeline-item {
  position: relative;
  padding-left: 2.6rem;
  margin-bottom: 1.5rem;
}

.page-about .page-about__timeline-item::before {
  content: "";
  position: absolute;
  left: 0.35rem;
  top: 0.6rem;
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  background: var(--bg-deep);
  border: 2px solid var(--neon);
  box-shadow: 0 0 0 4px rgba(57, 255, 20, 0.12);
  z-index: 1;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.page-about .page-about__timeline-item:hover::before {
  transform: scale(1.2);
  box-shadow: 0 0 0 7px rgba(57, 255, 20, 0.2);
}

.page-about .page-about__timeline-card {
  padding: 1.25rem;
  border: 1px solid var(--about-line-weak);
  border-left: 2px solid var(--neon);
  background: rgba(160, 211, 255, 0.04);
  transition: border-color 0.25s ease, background-color 0.25s ease;
}

.page-about .page-about__timeline-card:hover {
  border-color: var(--neon);
  background: rgba(57, 255, 20, 0.06);
}

.page-about .page-about__timeline-card .tag {
  display: inline-block;
  margin-bottom: 0.6rem;
}

.page-about .page-about__timeline-card .card__title {
  font-size: 1.15rem;
  line-height: 1.4;
}

.page-about .page-about__timeline-card .card__body {
  margin: 0.5rem 0 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--about-text-mid);
}

.page-about .page-about__history-figure {
  margin: 2rem 0 0;
}

/* ---------- 04 资质安全 ---------- */
.page-about .page-about__security-grid {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.page-about .page-about__security-card {
  padding: 1.5rem;
  border: 1px solid var(--about-line-weak);
  background: rgba(160, 211, 255, 0.04);
  transition: border-color 0.25s ease, background-color 0.25s ease;
}

.page-about .page-about__security-card:hover {
  border-color: var(--neon);
  background: rgba(57, 255, 20, 0.05);
}

.page-about .page-about__security-card .tag {
  display: inline-block;
  margin-bottom: 0.75rem;
}

.page-about .page-about__security-card .card__body {
  margin: 0.5rem 0 0;
  line-height: 1.75;
  color: var(--about-text-mid);
}

.page-about .page-about__security-figure {
  margin: 0;
}

.page-about .page-about__security-note {
  padding: 1.5rem;
  border: 1px dashed var(--about-line);
  background: rgba(5, 7, 13, 0.35);
}

.page-about .page-about__security-note p {
  margin: 0 0 1rem;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 05 合作荣誉 ---------- */
.page-about .page-about__partner-grid {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.page-about .page-about__partner-card {
  padding: 1.5rem;
  border: 1px solid var(--about-line-weak);
  background: rgba(160, 211, 255, 0.04);
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.page-about .page-about__partner-card:hover {
  border-color: var(--neon);
}

.page-about .page-about__partner-card .card__title {
  margin-bottom: 0.5rem;
}

.page-about .page-about__partner-card .card__body {
  margin: 0;
  line-height: 1.75;
  color: var(--about-text-mid);
}

.page-about .page-about__partner-cta {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 2rem;
  padding: 1.5rem;
  border: 1px solid var(--about-line);
  background: linear-gradient(120deg, rgba(57, 255, 20, 0.08), rgba(160, 211, 255, 0.04));
}

.page-about .page-about__partner-cta-copy {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.page-about .page-about__partner-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- 响应式 · 平板 ---------- */
@media (min-width: 48rem) {
  .page-about .page-hero__inner {
    padding-top: calc(var(--header-h) + 5rem);
    padding-bottom: 4rem;
  }

  .page-about .page-hero__grid {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }

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

  .page-about .page-hero__stat-num {
    font-size: 2rem;
  }

  .page-about .page-about__who-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    align-items: start;
  }

  .page-about .page-about__data-grid {
    display: grid;
    grid-template-columns: 1fr 0.9fr;
    align-items: start;
  }

  .page-about .page-about__data-points {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .page-about__security-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .page-about .page-about__security-figure,
  .page-about .page-about__security-note {
    grid-column: span 2;
  }

  .page-about .page-about__partner-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ---------- 响应式 · 桌面 ---------- */
@media (min-width: 72rem) {
  .page-about .page-about__layout {
    display: grid;
    grid-template-columns: 13.5rem 1fr;
    gap: 3rem;
    align-items: start;
  }

  .page-about .page-about__anchors {
    position: sticky;
    top: calc(var(--header-h) + 2rem);
    padding: 1.5rem 0;
    border: none;
    border-left: 1px solid var(--about-line);
    background: transparent;
  }

  .page-about .page-about__anchors-head {
    padding-left: 1rem;
  }

  .page-about .page-about__anchors-line {
    display: none;
  }

  .page-about .page-about__anchors-list {
    flex-direction: column;
    gap: 0;
    padding-left: 1rem;
  }

  .page-about .page-about__anchors-link {
    display: block;
    padding: 0.5rem 0.65rem;
    border: none;
    border-left: 2px solid transparent;
    border-radius: 0;
    font-size: 0.9rem;
    color: var(--muted);
  }

  .page-about .page-about__anchors-link:hover,
  .page-about .page-about__anchors-link:focus-visible {
    color: var(--white);
    border-left-color: var(--neon);
    background: transparent;
  }

  .page-about .page-about__anchors-note {
    padding-left: 1rem;
    padding-top: 1rem;
  }

  .page-about .page-about__section-title {
    font-size: 2.1rem;
  }

  .page-about .page-about__section-head {
    gap: 1.25rem;
  }

  .page-about .page-about__section-num {
    font-size: 1.2rem;
  }

  .page-about .page-about__timeline::before {
    left: 1.25rem;
  }

  .page-about .page-about__timeline-item {
    padding-left: 3.5rem;
  }

  .page-about .page-about__timeline-item::before {
    left: 0.75rem;
    width: 1.1rem;
    height: 1.1rem;
  }

  .page-about .page-about__timeline-card {
    padding: 1.5rem;
  }

  .page-about .page-about__security-note {
    padding: 1.75rem;
  }
}