.page-about {
  --pa-panel-pad: clamp(20px, 2.4vw, 30px);
  --pa-gap: clamp(20px, 2.6vw, 36px);
  --pa-radius-cut: 30px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding: 18px 0 6px;
}
.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
}
.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 10px;
  color: var(--line);
}
.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--neon);
  border-bottom-color: var(--neon-dim);
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--frost);
}

/* ---------- 首屏 ---------- */
.page-about .brand-hero {
  padding: clamp(24px, 4vw, 54px) 0 clamp(34px, 5vw, 72px);
  position: relative;
}
.page-about .brand-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: linear-gradient(90deg, var(--neon-dim), transparent 70%);
}
.page-about .brand-hero__grid {
  display: grid;
  gap: var(--pa-gap);
  grid-template-columns: 1fr;
}
.page-about .brand-hero__lead h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.1rem, 6.4vw, 4.4rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 14px 0 20px;
  color: var(--frost);
  max-width: 18ch;
}
.page-about .brand-hero__intro {
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--mist);
  max-width: 62ch;
  margin: 0 0 26px;
}
.page-about .hero-facts {
  list-style: none;
  margin: 0 0 30px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.page-about .hero-facts li {
  background: var(--ink-deep);
  padding: 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.page-about .hero-facts .num {
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  line-height: 1;
}
.page-about .hero-facts__label {
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--mist);
}
.page-about .brand-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 首屏侧栏档案 */
.page-about .hero-slab {
  position: relative;
  background:
    linear-gradient(150deg, var(--jewel-indigo) 0%, var(--ink-deep) 62%),
    var(--ink-deep);
  padding: var(--pa-panel-pad);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--pa-radius-cut)), calc(100% - var(--pa-radius-cut)) 100%, 0 100%);
  border: 1px solid var(--line);
}
.page-about .hero-slab::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 74px;
  height: 3px;
  background: var(--neon);
}
.page-about .hero-slab__title {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--neon);
  margin: 0 0 18px;
}
.page-about .hero-slab__list {
  margin: 0 0 18px;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
}
.page-about .hero-slab__list > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 14px;
  padding: 11px 0;
  background: transparent;
}
.page-about .hero-slab__list dt {
  font-size: 13px;
  color: var(--mist);
}
.page-about .hero-slab__list dd {
  margin: 0;
  color: var(--gold);
  font-size: 14px;
}
.page-about .hero-slab__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
  border-left: 2px solid var(--neon-dim);
  padding-left: 12px;
}

/* ---------- 坐标轴布局 ---------- */
.page-about .axis-layout {
  display: block;
  padding: clamp(30px, 4vw, 56px) 0 clamp(40px, 6vw, 90px);
}
.page-about .axis-rail {
  margin-bottom: 30px;
  padding: 16px 18px;
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--neon-dim);
  background: rgba(6, 10, 28, .55);
}
.page-about .axis-rail__title {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mist);
  margin: 0 0 12px;
}
.page-about .axis-rail ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}
.page-about .axis-rail a {
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--mist);
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
}
.page-about .axis-rail a:hover,
.page-about .axis-rail a:focus-visible,
.page-about .axis-rail a[aria-current="true"] {
  color: var(--neon);
  border-bottom-color: var(--neon);
}

.page-about .axis-body {
  min-width: 0;
}

/* ---------- 通用章节 ---------- */
.page-about .section {
  padding: clamp(36px, 5vw, 68px) 0;
  border-top: 1px solid var(--line-soft);
}
.page-about .section:first-child {
  border-top: none;
  padding-top: 0;
}
.page-about .section--tight {
  padding: clamp(30px, 4vw, 52px) 0;
}
.page-about .section h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 3.6vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--frost);
  margin: 10px 0 18px;
  max-width: 22ch;
}
.page-about .section-lead {
  color: var(--mist);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  max-width: 66ch;
  margin: 0 0 28px;
}
.page-about .section p {
  color: var(--frost);
  opacity: .88;
  line-height: 1.8;
}
.page-about .section p + p {
  margin-top: 14px;
}

/* 双栏 split */
.page-about .split {
  display: grid;
  gap: var(--pa-gap);
  grid-template-columns: 1fr;
}
.page-about .split__main p:first-child {
  margin-top: 0;
}
.page-about .note-card {
  padding: var(--pa-panel-pad);
}
.page-about .note-card__title {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--neon);
  margin: 0 0 10px;
}
.page-about .text-link {
  display: inline-block;
  margin-top: 12px;
  font-family: var(--font-data);
  font-size: 13px;
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid var(--neon-dim);
}
.page-about .text-link:hover,
.page-about .text-link:focus-visible {
  border-bottom-color: var(--neon);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline-visual {
  margin: 0 0 clamp(30px, 4vw, 54px);
}
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--neon-dim), var(--line-soft) 70%);
}
.page-about .timeline__item {
  position: relative;
  padding-left: 34px;
  padding-bottom: clamp(22px, 3vw, 34px);
}
.page-about .timeline__item:last-child {
  padding-bottom: 0;
}
.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 8px;
  width: 11px;
  height: 11px;
  background: var(--neon);
  box-shadow: 0 0 0 4px rgba(58, 231, 223, .14);
  transform: rotate(45deg);
}
.page-about .timeline__year {
  font-size: 13px;
  color: var(--gold);
  margin-bottom: 10px;
}
.page-about .timeline__year .mono {
  letter-spacing: .1em;
}
.page-about .timeline__card {
  padding: clamp(18px, 2.2vw, 26px);
}
.page-about .timeline__card h3 {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2.1vw, 1.4rem);
  color: var(--frost);
  margin: 0 0 10px;
  letter-spacing: -0.01em;
}
.page-about .timeline__card p {
  margin: 0;
  font-size: 15px;
  color: var(--frost);
  opacity: .82;
}
.page-about .timeline__meta {
  margin-top: 14px !important;
  font-size: 12px !important;
  color: var(--gold) !important;
  opacity: 1 !important;
  letter-spacing: .04em;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  margin-bottom: 26px;
}
.page-about .team-card {
  padding: var(--pa-panel-pad);
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.page-about .team-card__idx {
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--neon);
  margin: 0;
}
.page-about .team-card h3 {
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2.2vw, 1.5rem);
  color: var(--frost);
  margin: 0;
}
.page-about .team-card p {
  margin: 0;
  font-size: 15px;
  color: var(--frost);
  opacity: .82;
}
.page-about .tick-list {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.page-about .tick-list li {
  position: relative;
  padding-left: 18px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--mist);
}
.page-about .tick-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 1px;
  background: var(--neon);
}
.page-about .team-note {
  border-top: 1px solid var(--line-soft);
  padding-top: 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--frost);
  opacity: .85;
  max-width: 78ch;
}

/* ---------- 覆盖规模 ---------- */
.page-about .stat-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  margin-top: 26px;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.page-about .stat-cell {
  background: var(--ink-deep);
  padding: 18px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.page-about .stat-cell__num {
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  line-height: 1;
}
.page-about .stat-cell__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 质量管理 ---------- */
.page-about .quality-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-soft);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  margin-bottom: 30px;
}
.page-about .quality-step {
  background: var(--ink-deep);
  padding: clamp(20px, 2.4vw, 28px);
}
.page-about .quality-step__num {
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--neon);
  margin: 0 0 10px;
}
.page-about .quality-step h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--frost);
  margin: 0 0 8px;
}
.page-about .quality-step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}
.page-about .quality-callout {
  padding: clamp(24px, 3vw, 40px);
  display: grid;
  gap: 16px;
}
.page-about .quality-callout__big {
  font-size: clamp(3rem, 10vw, 5.4rem);
  line-height: .92;
  letter-spacing: -0.03em;
  margin: 0;
}
.page-about .quality-callout__text {
  margin: 0;
  max-width: 60ch;
  color: var(--frost);
  opacity: .86;
  line-height: 1.8;
  font-size: 15px;
}
.page-about .quality-callout .btn {
  justify-self: start;
}

/* ---------- 白皮书 ---------- */
.page-about .wp-card {
  padding: var(--pa-panel-pad);
}
.page-about .wp-card__title {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 0 0 16px;
}
.page-about .wp-card__note {
  margin: 18px 0 0;
  font-size: 12.5px;
  color: var(--mist);
  border-top: 1px solid var(--line-soft);
  padding-top: 14px;
}

/* ---------- 多端适配 ---------- */
.page-about .device-card {
  padding: var(--pa-panel-pad);
}
.page-about .device-card__type {
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--neon);
  margin: 0 0 10px;
}
.page-about .device-card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--frost);
  margin: 0 0 10px;
}
.page-about .device-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 收束 ---------- */
.page-about .closing {
  margin-top: clamp(30px, 4vw, 56px);
}
.page-about .closing__inner {
  position: relative;
  padding: clamp(28px, 4vw, 52px);
  background: linear-gradient(120deg, var(--jewel-indigo) 0%, var(--ink-void) 72%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 44px), calc(100% - 44px) 100%, 0 100%);
  border: 1px solid var(--line);
}
.page-about .closing__inner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100px;
  height: 3px;
  background: var(--neon);
}
.page-about .closing h2 {
  margin: 12px 0 14px;
  max-width: 20ch;
}
.page-about .closing__text {
  margin: 0 0 24px;
  max-width: 62ch;
  color: var(--mist);
  line-height: 1.8;
  font-size: 15px;
}
.page-about .closing__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 媒体框微调 ---------- */
.page-about .media-frame {
  margin: 0;
}
.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .quality-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .device-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .quality-callout {
    grid-template-columns: minmax(0, 0.45fr) minmax(0, 1fr);
    align-items: center;
  }
  .page-about .quality-callout .btn {
    grid-column: 2;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1080px) {
  .page-about .brand-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(300px, 0.85fr);
    align-items: start;
  }
  .page-about .axis-layout {
    display: grid;
    grid-template-columns: var(--rail) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 64px);
    align-items: start;
    padding-left: 18px;
  }
  .page-about .axis-rail {
    position: sticky;
    top: calc(var(--header-h) + 26px);
    margin-bottom: 0;
    border-left: 2px solid var(--neon-dim);
    background: linear-gradient(180deg, rgba(27, 34, 96, .5), rgba(6, 10, 28, .3));
  }
  .page-about .axis-rail ul {
    flex-direction: column;
    gap: 4px;
  }
  .page-about .axis-rail li {
    border-bottom: 1px solid var(--line-soft);
  }
  .page-about .axis-rail li:last-child {
    border-bottom: none;
  }
  .page-about .axis-rail a {
    display: block;
    padding: 9px 0 9px 14px;
    position: relative;
  }
  .page-about .axis-rail a::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 6px;
    height: 1px;
    background: var(--line);
    transform: translateY(-50%);
  }
  .page-about .axis-rail a[aria-current="true"]::before {
    width: 14px;
    height: 2px;
    background: var(--neon);
  }
  .page-about .split {
    grid-template-columns: minmax(0, 8fr) minmax(0, 3fr);
    align-items: start;
  }
  .page-about .timeline {
    padding-left: 92px;
  }
  .page-about .timeline::before {
    left: 40px;
  }
  .page-about .timeline__item {
    padding-left: 30px;
  }
  .page-about .timeline__item::before {
    left: 35px;
  }
  .page-about .timeline__year {
    position: absolute;
    left: 0;
    top: 0;
    width: 92px;
    margin: 0;
    text-align: right;
    padding-right: 24px;
  }
  .page-about .quality-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .section h2 {
    font-size: clamp(1.9rem, 3vw, 2.8rem);
  }
}

@media (min-width: 1320px) {
  .page-about .timeline__card {
    max-width: 74ch;
  }
  .page-about .team-grid {
    gap: var(--pa-gap);
  }
}