.page-about {
  --about-pad: 20px;
  --about-gap: 28px;
  position: relative;
  overflow-x: hidden;
  color: var(--text);
  background: var(--ink);
}

.page-about .shell {
  width: 100%;
  max-width: var(--w);
  margin: 0 auto;
  padding-left: var(--about-pad);
  padding-right: var(--about-pad);
}

.page-about .breadcrumbs {
  max-width: var(--w);
  margin: 0 auto;
  padding: 22px var(--about-pad) 0;
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}

.page-about .breadcrumbs a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--blue);
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-about .breadcrumbs li[aria-current="page"] {
  color: var(--text);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 34px 0 62px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -140px 0 auto 0;
  height: 560px;
  pointer-events: none;
  background:
    radial-gradient(58% 100% at 76% 0%, rgba(46, 125, 255, 0.26), transparent 70%),
    radial-gradient(44% 78% at 10% 6%, rgba(138, 107, 255, 0.16), transparent 72%);
}

.page-about .about-hero__inner {
  position: relative;
}

.page-about h1 {
  margin: 0.4em 0 0.55em;
  max-width: 15em;
  font-size: clamp(1.95rem, 5.6vw, 3.7rem);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-hero__lead {
  max-width: 34em;
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.75;
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .hero-facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: rgba(20, 29, 47, 0.82);
}

.page-about .hero-facts__num {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}

.page-about .hero-facts__num em {
  font-style: normal;
  font-size: 0.95rem;
  margin-left: 2px;
}

.page-about .hero-facts__num--blue {
  color: var(--blue);
}

.page-about .hero-facts__num--violet {
  color: var(--violet);
}

.page-about .hero-facts__label {
  color: var(--muted);
  font-size: 0.82rem;
  letter-spacing: 0.03em;
}

/* ---------- 侧栏章节索引 ---------- */
.page-about .about-side {
  display: none;
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  position: relative;
  padding: 66px 0;
}

.page-about .about-section + .about-section {
  border-top: 1px solid rgba(38, 51, 74, 0.55);
}

.page-about .about-section--alt {
  background: var(--ink-2);
}

.page-about .section-head {
  max-width: 40em;
  margin: 0 0 34px;
}

.page-about .section-title {
  margin: 0.35em 0 0.5em;
  font-size: clamp(1.45rem, 3.3vw, 2.35rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.015em;
}

.page-about .section-lead {
  margin: 0;
  color: var(--muted);
  font-size: 0.97rem;
  line-height: 1.75;
}

.page-about .tab-host > .segmented {
  margin-bottom: 22px;
}

.page-about .tab-panel {
  margin-top: 4px;
}

/* ---------- 01 三类数据 ---------- */
.page-about .pillar-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .pillar {
  position: relative;
  padding: 26px 22px 24px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(158deg, rgba(20, 29, 47, 0.96), rgba(12, 18, 32, 0.92));
  overflow: hidden;
}

.page-about .pillar::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 3px;
  background: var(--blue);
}

.page-about .pillar--violet::after {
  background: var(--violet);
}

.page-about .pillar--green::after {
  background: var(--green);
}

.page-about .pillar__tag {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--blue);
}

.page-about .pillar--violet .pillar__tag {
  color: var(--violet);
}

.page-about .pillar--green .pillar__tag {
  color: var(--green);
}

.page-about .pillar__title {
  margin: 0 0 12px;
  font-size: 1.18rem;
  font-weight: 800;
  line-height: 1.35;
}

.page-about .pillar__text {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 0.93rem;
  line-height: 1.75;
}

.page-about .pillar__meta {
  margin: 0;
  padding-top: 14px;
  border-top: 1px dashed rgba(38, 51, 74, 0.9);
  color: var(--text);
  font-size: 0.88rem;
  line-height: 1.7;
}

/* ---------- 02 流程 ---------- */
.page-about .pipeline {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
}

.page-about .pipeline__panel {
  padding-top: 4px;
}

.page-about .pipeline__index {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}

.page-about .pipeline__title {
  margin: 0 0 12px;
  font-size: 1.14rem;
  font-weight: 800;
}

.page-about .pipeline__panel p {
  margin: 0;
  max-width: 36em;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.78;
}

.page-about .pipeline .segmented {
  margin-bottom: 20px;
}

.page-about .pipeline__media {
  margin: 0;
}

/* ---------- 03 团队 ---------- */
.page-about .team-bars {
  display: grid;
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team-bar--eng { --pct: 38.2%; --bar: var(--blue); }
.page-about .team-bar--edit { --pct: 20.6%; --bar: var(--green); }
.page-about .team-bar--design { --pct: 16.2%; --bar: var(--orange); }
.page-about .team-bar--support { --pct: 25%; --bar: var(--violet); }

.page-about .team-bar__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 9px;
}

.page-about .team-bar__name {
  font-size: 0.94rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .team-bar__num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--bar, var(--blue));
  font-variant-numeric: tabular-nums;
}

.page-about .team-bar__track {
  position: relative;
  height: 10px;
  border-radius: var(--r-pill);
  background: rgba(38, 51, 74, 0.7);
  overflow: hidden;
}

.page-about .team-bar__fill {
  display: block;
  width: var(--pct, 0%);
  height: 100%;
  border-radius: var(--r-pill);
  background: var(--bar, var(--blue));
}

.page-about .duty-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .duty-card {
  padding: 20px 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(20, 29, 47, 0.7);
}

.page-about .duty-card__title {
  margin: 0 0 9px;
  font-size: 1rem;
  font-weight: 800;
  color: var(--text);
}

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

/* ---------- 04 时间轴 ---------- */
.page-about .timeline-figure {
  margin: 0 0 42px;
}

.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 22px 18px 22px 46px;
  list-style: none;
  border-radius: var(--r-lg);
  background-image:
    repeating-linear-gradient(90deg, rgba(193, 85, 63, 0.05) 0 2px, transparent 2px 30px),
    repeating-linear-gradient(0deg, rgba(193, 85, 63, 0.035) 0 1px, transparent 1px 20px);
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 24px;
  top: 30px;
  bottom: 30px;
  width: 2px;
  background: linear-gradient(180deg, var(--green), var(--blue) 46%, var(--violet));
  opacity: 0.6;
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 32px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--green);
  box-shadow: 0 0 0 4px rgba(34, 227, 154, 0.12);
}

.page-about .tl-item--blue::before {
  border-color: var(--blue);
  box-shadow: 0 0 0 4px rgba(46, 125, 255, 0.14);
}

.page-about .tl-item--orange::before {
  border-color: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 138, 43, 0.14);
}

.page-about .tl-item--violet::before {
  border-color: var(--violet);
  box-shadow: 0 0 0 4px rgba(138, 107, 255, 0.16);
}

.page-about .tl-node {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.page-about .tl-ver {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ink);
  background: var(--green);
  border-radius: var(--r-pill);
  padding: 3px 12px;
}

.page-about .tl-item--blue .tl-ver { background: var(--blue); color: var(--ink); }
.page-about .tl-item--orange .tl-ver { background: var(--orange); color: var(--ink); }
.page-about .tl-item--violet .tl-ver { background: var(--violet); color: var(--ink); }

.page-about .tl-stage {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .tl-title {
  margin: 0 0 8px;
  font-size: 1.1rem;
  font-weight: 800;
}

.page-about .tl-desc {
  margin: 0 0 8px;
  max-width: 38em;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.75;
}

.page-about .tl-note {
  margin: 0;
  max-width: 38em;
  padding-left: 12px;
  border-left: 2px solid rgba(38, 51, 74, 0.95);
  color: rgba(154, 171, 196, 0.75);
  font-size: 0.85rem;
  line-height: 1.7;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .tl-item:hover .tl-note,
.page-about .tl-item:focus-within .tl-note {
  color: var(--text);
  border-left-color: var(--blue);
}

/* ---------- 05 共建 ---------- */
.page-about .partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.page-about .partners__text p {
  margin: 0 0 14px;
  max-width: 36em;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.78;
}

.page-about .partners__media {
  margin: 0;
}

.page-about .partner-strip {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: 4px 0 14px;
  scrollbar-width: thin;
}

.page-about .partner-strip .chip {
  flex: 0 0 auto;
  white-space: nowrap;
}

/* ---------- 06 指标 ---------- */
.page-about .metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--line);
  overflow: hidden;
}

.page-about .metric {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 18px;
  background: var(--surface);
}

.page-about .metric-num {
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4.4vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.page-about .metric--green .metric-num { color: var(--green); }
.page-about .metric--blue .metric-num { color: var(--blue); }
.page-about .metric--orange .metric-num { color: var(--orange); }
.page-about .metric--violet .metric-num { color: var(--violet); }

.page-about .metric-unit {
  font-size: 0.85rem;
  font-weight: 500;
  margin-left: 5px;
  letter-spacing: 0.04em;
}

.page-about .metric-label {
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.65;
}

/* ---------- 07 行动 ---------- */
.page-about .about-cta__band {
  position: relative;
  padding: 40px 24px 38px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(120deg, rgba(46, 125, 255, 0.2), rgba(138, 107, 255, 0.12) 58%, rgba(5, 7, 13, 0.2));
  overflow: hidden;
}

.page-about .about-cta__band::before {
  content: "";
  position: absolute;
  inset: -60% -12%;
  background: linear-gradient(90deg, transparent, rgba(34, 227, 154, 0.14), transparent);
  transform: rotate(-6deg);
  pointer-events: none;
}

.page-about .about-cta__band > * {
  position: relative;
}

.page-about .about-cta__band .section-title {
  max-width: 18em;
}

.page-about .about-cta__lead {
  max-width: 36em;
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.78;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 680px) {
  .page-about {
    --about-pad: 32px;
  }

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

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

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

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

  .page-about .about-section {
    padding: 82px 0;
  }
}

@media (min-width: 920px) {
  .page-about .pillar-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .pipeline {
    grid-template-columns: minmax(0, 1fr) 330px;
    gap: 52px;
    align-items: start;
  }

  .page-about .partners {
    grid-template-columns: minmax(0, 1fr) 400px;
    gap: 44px;
    align-items: start;
  }

  .page-about .partners__media {
    grid-column: 2;
    grid-row: 1 / span 2;
  }

  .page-about .partner-strip {
    grid-column: 1 / -1;
    flex-wrap: wrap;
    overflow-x: visible;
    padding-top: 12px;
    border-top: 1px dashed rgba(38, 51, 74, 0.9);
  }

  .page-about .timeline {
    padding: 34px 40px 34px 62px;
  }

  .page-about .timeline::before {
    left: 34px;
  }

  .page-about .tl-item::before {
    left: -35px;
  }

  .page-about .tl-item {
    display: grid;
    grid-template-columns: 200px minmax(0, 1fr);
    column-gap: 26px;
    align-items: start;
    padding-bottom: 38px;
  }

  .page-about .tl-node {
    grid-column: 1;
    margin-bottom: 0;
    padding-top: 2px;
  }

  .page-about .tl-title,
  .page-about .tl-desc,
  .page-about .tl-note {
    grid-column: 2;
  }

  .page-about .tl-title {
    margin-top: 0;
  }

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

@media (min-width: 1080px) {
  .page-about .about-cta__band {
    padding: 52px 48px 48px;
  }
}

@media (min-width: 1600px) {
  .page-about .about-side {
    display: block;
    position: fixed;
    left: calc(50% + 648px);
    top: 128px;
    width: 140px;
    z-index: 2;
  }

  .page-about .about-side__title {
    margin: 0 0 12px;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.14em;
    color: var(--muted);
  }

  .page-about .about-side__list {
    display: grid;
    gap: 10px;
    margin: 0;
    padding: 0;
    list-style: none;
    border-left: 1px solid var(--line);
  }

  .page-about .about-side__list a {
    display: flex;
    align-items: baseline;
    gap: 8px;
    padding: 2px 0 2px 12px;
    color: var(--muted);
    font-size: 0.82rem;
    text-decoration: none;
    transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
    border-left: 2px solid transparent;
    margin-left: -1px;
  }

  .page-about .about-side__list a:hover,
  .page-about .about-side__list a:focus-visible {
    color: var(--text);
    border-left-color: var(--blue);
  }

  .page-about .about-side__list .num {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--blue);
  }
}