.page-about {
  --about-rail-col: 128px;
  --about-line-dark: rgba(237, 232, 220, 0.14);
  --about-line-paper: rgba(27, 33, 31, 0.16);
  --about-muted-dark: rgba(237, 232, 220, 0.64);
  --about-muted-paper: rgba(27, 33, 31, 0.64);
  --about-card-paper: rgba(255, 255, 255, 0.42);
  background: var(--night);
  color: var(--paper);
  overflow-x: hidden;
}

.page-about .about-inner {
  width: 100%;
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: 1.25rem;
}

.page-about .about-crumbs {
  padding-top: 1.5rem;
}

.page-about .breadcrumb-link {
  color: var(--about-muted-dark);
  transition: color 0.16s ease;
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--cyan);
}

.page-about .breadcrumb-current,
.page-about .breadcrumb-item {
  color: var(--mist);
}

/* ---------- 首屏 ---------- */

.page-about .about-masthead {
  padding-bottom: 2.5rem;
  background:
    radial-gradient(120% 88% at 88% 0%, rgba(0, 227, 200, 0.14), transparent 62%),
    var(--night);
}

.page-about .about-masthead-grid {
  display: grid;
  gap: 2rem;
  padding-top: 1.5rem;
  padding-bottom: 2.5rem;
}

.page-about .about-kicker {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about h1 {
  margin: 0 0 1.1rem;
  font-family: var(--font-serif);
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: clamp(2rem, 5.4vw, 3.5rem);
  line-height: 1.14;
  color: var(--paper);
  max-width: 20ch;
}

.page-about .about-lede {
  margin: 0;
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--about-muted-dark);
  max-width: 46ch;
}

.page-about .about-slant {
  display: block;
  width: 96px;
  height: var(--line);
  margin-top: 1.6rem;
  background: var(--clay);
  transform: rotate(-12deg);
  transform-origin: left center;
}

.page-about .about-masthead-figure {
  margin: 0;
  border: var(--line) solid var(--about-line-dark);
  background: var(--rock);
}

.page-about .about-masthead-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-masthead-figure .figure-caption {
  padding: 0.7rem 0.9rem 0.8rem;
  border-top: var(--line) solid var(--about-line-dark);
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-masthead-stats {
  display: grid;
  gap: 0;
  margin: 0;
  border-top: var(--line) solid var(--about-line-dark);
  border-bottom: var(--line) solid var(--about-line-dark);
}

.page-about .about-stat {
  padding: 1rem 0;
  border-bottom: 1px solid var(--about-line-dark);
}

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

.page-about .about-stat dt {
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-stat dd {
  margin: 0.35rem 0 0;
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.04em;
  font-size: 1.75rem;
  color: var(--cyan);
}

.page-about .about-stat-unit {
  margin-left: 0.25rem;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--mist);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-section {
  border-top: var(--line) solid var(--about-line-dark);
}

.page-about .about-section--paper {
  background: var(--paper);
  color: var(--ink);
  border-top-color: var(--about-line-paper);
}

.page-about .about-section-inner {
  width: 100%;
  max-width: 1280px;
  margin-inline: auto;
  padding: 3rem 1.25rem;
  display: grid;
  gap: 1.25rem;
}

.page-about .about-rail {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.page-about .about-rail-num {
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.04em;
  font-size: clamp(2.4rem, 7vw, 3.4rem);
  line-height: 0.9;
  color: var(--cyan);
}

.page-about .about-section--paper .about-rail-num {
  color: var(--cyan-deep);
}

.page-about .about-rail-label {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .about-body h2 {
  margin: 0 0 1.1rem;
  font-family: var(--font-serif);
  font-weight: 700;
  letter-spacing: -0.015em;
  font-size: clamp(1.5rem, 3.4vw, 2.25rem);
  line-height: 1.26;
}

.page-about .about-body p {
  margin: 0 0 1rem;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--about-muted-dark);
  max-width: 62ch;
}

.page-about .about-section--paper .about-body p {
  color: var(--about-muted-paper);
}

.page-about .about-body h3 {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
}

.page-about .about-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: var(--line) solid rgba(0, 227, 200, 0.4);
  transition: color 0.16s ease, border-color 0.16s ease;
}

.page-about .about-section--paper .about-link {
  color: var(--cyan-deep);
  border-bottom-color: rgba(11, 122, 108, 0.4);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-about .about-section--paper .about-link:hover,
.page-about .about-section--paper .about-link:focus-visible {
  color: var(--clay);
  border-bottom-color: var(--clay);
}

/* ---------- 02 三条线卡片 ---------- */

.page-about .about-cards {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
}

.page-about .about-card {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  padding: 1.25rem;
  background: var(--about-card-paper);
  border: var(--line) solid var(--about-line-paper);
  transition: transform 0.16s ease, border-color 0.16s ease;
}

.page-about .about-card:hover {
  transform: translateY(-2px);
  border-color: var(--cyan-deep);
}

.page-about .about-card-tag {
  align-self: flex-start;
  padding: 0.16rem 0.5rem;
  border: 1px solid var(--clay);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--clay);
}

.page-about .about-card p {
  margin: 0;
  flex: 1 1 auto;
  font-size: 0.95rem;
  line-height: 1.78;
  color: var(--about-muted-paper);
}

.page-about .about-card .about-link {
  align-self: flex-start;
  font-size: 0.9rem;
}

/* ---------- 03 产品线色带 ---------- */

.page-about .about-bands {
  display: grid;
  gap: 0.75rem;
  margin-top: 1.6rem;
}

.page-about .about-band {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding: 1rem 1rem 1.15rem;
  background: var(--rock);
  border: var(--line) solid var(--about-line-dark);
  color: var(--paper);
  text-decoration: none;
  transition: transform 0.16s ease, border-color 0.16s ease, background-color 0.16s ease;
}

.page-about .about-band:hover,
.page-about .about-band:focus-visible {
  transform: translateY(-2px);
  border-color: var(--cyan);
  background: var(--rock-2);
}

.page-about .about-band-ver {
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.04em;
  font-size: 1.15rem;
  color: var(--cyan);
}

.page-about .about-band-name {
  font-weight: 700;
  font-size: 0.98rem;
}

.page-about .about-band-desc {
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--about-muted-dark);
}

.page-about .about-band-figure {
  margin: 1.75rem 0 0;
  max-width: 480px;
  border: var(--line) solid var(--about-line-dark);
  background: var(--rock);
}

.page-about .about-band-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 7;
  object-fit: cover;
}

.page-about .about-band-figure .figure-caption {
  padding: 0.7rem 0.9rem 0.8rem;
  border-top: var(--line) solid var(--about-line-dark);
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 04 时间线 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0;
}

.page-about .about-tl-item {
  position: relative;
  border-left: var(--line) solid var(--clay);
  padding-left: 1.5rem;
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 1.35rem;
  width: 12px;
  height: 12px;
  background: var(--clay);
}

.page-about .about-tl-node {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 0.2rem 0.9rem;
  padding: 0.9rem 0.85rem 0.95rem 0;
  text-decoration: none;
  color: inherit;
  border-bottom: 1px solid var(--about-line-paper);
  transition: background-color 0.16s ease, padding-left 0.16s ease;
}

.page-about .about-tl-item:last-child .about-tl-node {
  border-bottom: 0;
}

.page-about .about-tl-node:hover,
.page-about .about-tl-node:focus-visible {
  background: rgba(176, 103, 63, 0.08);
  padding-left: 0.6rem;
}

.page-about .about-tl-ver {
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.04em;
  font-size: 1rem;
  color: var(--cyan-deep);
}

.page-about .about-tl-main {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.page-about .about-tl-title {
  font-weight: 700;
  font-size: 1rem;
  color: var(--ink);
}

.page-about .about-tl-note {
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--about-muted-paper);
}

.page-about .about-note {
  margin-top: 1.4rem;
  padding-left: 1rem;
  border-left: var(--line) solid var(--moss);
}

/* ---------- 05 团队构成 ---------- */

.page-about .about-bar {
  display: flex;
  height: 30px;
  margin-top: 1.6rem;
  border: var(--line) solid var(--about-line-dark);
}

.page-about .about-bar-seg {
  display: block;
  height: 100%;
}

.page-about .about-bar-seg--dev {
  flex: 116;
  background: var(--cyan);
}

.page-about .about-bar-seg--data {
  flex: 42;
  background: var(--lime);
}

.page-about .about-bar-seg--ops {
  flex: 22;
  background: var(--moss);
}

.page-about .about-team-legend {
  list-style: none;
  margin: 1.25rem 0 1.75rem;
  padding: 0;
  display: grid;
  gap: 0.65rem;
}

.page-about .about-team-item {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.7rem;
  font-size: 0.92rem;
}

.page-about .about-swatch {
  width: 14px;
  height: 14px;
  display: block;
}

.page-about .about-swatch--dev { background: var(--cyan); }
.page-about .about-swatch--data { background: var(--lime); }
.page-about .about-swatch--ops { background: var(--moss); }

.page-about .about-team-role {
  color: var(--about-muted-dark);
}

.page-about .about-team-num {
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--paper);
}

/* ---------- 06 资质 ---------- */

.page-about .about-creds {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-cred {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
  padding: 1.1rem 1.15rem;
  border: var(--line) solid var(--about-line-paper);
  background: var(--about-card-paper);
}

.page-about .about-cred-num {
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.04em;
  font-size: clamp(2rem, 6vw, 2.8rem);
  line-height: 1;
  color: var(--cyan-deep);
}

.page-about .about-cred-text h3 {
  margin-bottom: 0.35rem;
  color: var(--ink);
}

.page-about .about-cred-text p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--about-muted-paper);
}

.page-about .about-quote {
  margin: 1.5rem 0 0;
  padding: 1.1rem 1.25rem;
  border-left: 4px solid var(--clay);
  background: rgba(176, 103, 63, 0.09);
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--ink);
}

/* ---------- 07 合作生态 ---------- */

.page-about .about-eco-grid {
  display: grid;
  gap: 1.75rem;
  margin-top: 1.5rem;
}

.page-about .about-eco-list {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-eco-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.9rem;
  align-items: baseline;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--about-line-dark);
}

.page-about .about-eco-num {
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.04em;
  font-size: 1.75rem;
  color: var(--neon);
}

.page-about .about-eco-label {
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--about-muted-dark);
}

.page-about .about-cta {
  display: inline-block;
}

.page-about .about-eco-figure {
  margin: 0;
  border: var(--line) solid var(--about-line-dark);
  background: var(--rock);
}

.page-about .about-eco-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-eco-figure .figure-caption {
  padding: 0.7rem 0.9rem 0.8rem;
  border-top: var(--line) solid var(--about-line-dark);
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 焦点可见 ---------- */

.page-about a:focus-visible,
.page-about .about-card:focus-within {
  outline: var(--line) solid var(--focus-ring);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-inner,
  .page-about .about-section-inner {
    padding-inline: 2rem;
  }

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

  .page-about .about-stat {
    padding-right: 1.5rem;
    border-bottom: 1px solid var(--about-line-dark);
  }

  .page-about .about-stat:nth-child(2n) {
    padding-left: 1.5rem;
    border-left: 1px solid var(--about-line-dark);
  }

  .page-about .about-stat:nth-last-child(-n + 2) {
    border-bottom: 0;
  }

  .page-about .about-cred {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: center;
  }
}

@media (min-width: 900px) {
  .page-about .about-inner,
  .page-about .about-section-inner {
    padding-inline: 3rem;
  }

  .page-about .about-crumbs {
    padding-top: 2rem;
  }

  .page-about .about-masthead-grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    align-items: end;
    gap: 3.5rem;
    padding-top: 2.5rem;
    padding-bottom: 3.5rem;
  }

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

  .page-about .about-stat,
  .page-about .about-stat:nth-child(2n),
  .page-about .about-stat:nth-last-child(-n + 2) {
    padding: 1.25rem 1.5rem 1.35rem 1.5rem;
    border-bottom: 0;
    border-left: 1px solid var(--about-line-dark);
  }

  .page-about .about-stat:first-child {
    padding-left: 0;
    border-left: 0;
  }

  .page-about .about-section-inner {
    grid-template-columns: var(--about-rail-col) minmax(0, 1fr);
    gap: 3.5rem;
    padding-block: 5rem;
  }

  .page-about .about-rail {
    flex-direction: column;
    gap: 0.5rem;
    position: sticky;
    top: calc(var(--bar-h) + 2rem);
    align-self: start;
  }

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

  .page-about .about-bands {
    grid-template-columns: 1fr 1.4fr 1.5fr 1.15fr;
    gap: 0;
  }

  .page-about .about-band {
    border-right: 0;
  }

  .page-about .about-band:last-child {
    border-right: var(--line) solid var(--about-line-dark);
  }

  .page-about .about-band:hover,
  .page-about .about-band:focus-visible {
    border-right: var(--line) solid var(--cyan);
    z-index: 1;
  }

  .page-about .about-band--w2,
  .page-about .about-band--w3 {
    padding-inline: 1.25rem;
  }

  .page-about .about-band-figure {
    max-width: 560px;
  }

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

  .page-about .about-team-item {
    grid-template-columns: 14px minmax(0, 1fr);
    grid-template-areas:
      "swatch role"
      "swatch num";
    align-items: start;
    row-gap: 0.3rem;
  }

  .page-about .about-swatch { grid-area: swatch; margin-top: 0.3rem; }
  .page-about .about-team-role { grid-area: role; }
  .page-about .about-team-num { grid-area: num; }

  .page-about .about-eco-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    gap: 2.5rem;
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about {
    --about-rail-col: 148px;
  }

  .page-about .about-lede {
    font-size: 1.15rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-band,
  .page-about .about-card,
  .page-about .about-tl-node,
  .page-about .breadcrumb-link,
  .page-about .about-link {
    transition: none;
  }
}