.page-about {
  --about-pad: clamp(2.25rem, 6vw, 4.5rem);
  --about-gap: clamp(1.5rem, 4vw, 2.75rem);
  display: block;
}

.page-about h1,
.page-about h2 {
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.18;
  margin: 0;
}

.page-about .about-crumb {
  padding-top: clamp(1rem, 3vw, 1.75rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(1rem, 3vw, 1.75rem) 0 var(--about-pad);
}

.page-about .about-hero__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-hero__copy h1 {
  font-size: clamp(1.85rem, 5.2vw, 3rem);
  color: var(--text-white);
  margin-top: 0.5rem;
}

.page-about .about-hero__lead {
  margin: 1rem 0 0;
  color: var(--mist-300);
  font-size: clamp(0.95rem, 1.4vw, 1.05rem);
  line-height: 1.75;
  max-width: 34rem;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 1.25rem;
}

.page-about .about-fact {
  border-left: 2px solid var(--pulse-cyan);
  padding-left: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.page-about .about-fact__num {
  color: var(--text-white);
  font-size: 1.05rem;
  font-weight: 600;
}

.page-about .about-fact__label {
  color: var(--mist-300);
  font-size: 0.78rem;
  line-height: 1.5;
}

.page-about .about-hero__actions {
  margin-top: 1.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .about-hero__visual {
  margin: 0;
  border: 1px solid var(--line-steel);
  background: var(--ink-900);
  padding: clamp(1rem, 3vw, 1.75rem);
}

.page-about .about-pulse {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-pulse__grid line {
  stroke: var(--ink-800);
  stroke-width: 1;
}

.page-about .about-pulse__ticks line {
  stroke: var(--line-steel);
  stroke-width: 1;
}

.page-about .about-pulse__wave {
  fill: none;
  stroke: var(--pulse-cyan);
  stroke-width: 2;
  stroke-linejoin: round;
}

.page-about .about-pulse__dot {
  fill: var(--signal-amber);
}

.page-about .about-hero__caption {
  margin-top: 1rem;
  color: var(--mist-300);
  font-size: 0.78rem;
  line-height: 1.6;
}

/* ---------- 通用区块 ---------- */
.page-about .about-section {
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--line-steel);
}

.page-about .about-section__head {
  max-width: 46rem;
}

.page-about .about-section__head h2 {
  font-size: clamp(1.45rem, 3.4vw, 2.15rem);
  color: var(--text-white);
  margin-top: 0.4rem;
}

.page-about .about-section__lead {
  margin: 0.9rem 0 0;
  color: var(--mist-300);
  line-height: 1.75;
  font-size: 0.95rem;
}

.page-about .about-note {
  margin: 1.5rem 0 0;
  padding-left: 0.85rem;
  border-left: 2px solid var(--line-steel);
  color: var(--mist-300);
  font-size: 0.82rem;
  line-height: 1.7;
  max-width: 42rem;
}

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

.page-about .about-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line-steel);
  background: var(--ink-900);
}

.page-about .about-frame .media-frame__caption,
.page-about .about-frame figcaption {
  margin-top: 0.85rem;
  color: var(--mist-300);
  font-size: 0.78rem;
  line-height: 1.6;
}

/* ---------- 时间轴 ---------- */
.page-about .tl {
  list-style: none;
  margin: 2.25rem 0 0;
  padding: 0 0 0 1.75rem;
  position: relative;
  display: grid;
  gap: 1.75rem;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 0.35rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 1px;
  background: var(--line-steel);
}

.page-about .tl__node {
  position: relative;
  outline: none;
}

.page-about .tl__dot {
  position: absolute;
  left: -1.75rem;
  top: 0.35rem;
  width: 0.72rem;
  height: 0.72rem;
  background: var(--ink-950);
  border: 1px solid var(--pulse-cyan);
  transition: background var(--dur) ease-out, border-color var(--dur) ease-out;
}

.page-about .tl__stage {
  margin: 0;
  color: var(--signal-amber);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}

.page-about .tl__title {
  margin: 0.35rem 0 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-white);
}

.page-about .tl__desc {
  margin: 0.4rem 0 0;
  color: var(--mist-300);
  font-size: 0.88rem;
  line-height: 1.7;
}

.page-about .tl__note {
  margin: 0.5rem 0 0;
  color: var(--line-steel);
  font-size: 0.8rem;
  line-height: 1.65;
}

.page-about .tl__node:hover .tl__dot,
.page-about .tl__node:focus .tl__dot {
  background: var(--signal-amber);
  border-color: var(--signal-amber);
}

.page-about .tl__node:focus-visible {
  outline: 2px solid var(--pulse-cyan);
  outline-offset: 4px;
}

.page-about .tl__node:hover .tl__title {
  color: var(--pulse-cyan);
}

/* ---------- 生产流程 ---------- */
.page-about .flow {
  list-style: none;
  margin: 2.25rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

.page-about .flow__step {
  border: 1px solid var(--line-steel);
  padding: clamp(1rem, 2.5vw, 1.5rem);
  background: var(--ink-900);
  transition: border-color var(--dur) ease-out, background var(--dur) ease-out;
}

.page-about .flow__step:hover {
  border-color: var(--pulse-cyan);
  background: var(--ink-800);
}

.page-about .flow__num {
  margin: 0;
  color: var(--signal-amber);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
}

.page-about .flow__title {
  margin: 0.6rem 0 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-white);
}

.page-about .flow__desc {
  margin: 0.5rem 0 0;
  color: var(--mist-300);
  font-size: 0.86rem;
  line-height: 1.75;
}

/* ---------- 浅色反相带 ---------- */
.page-about .about-band {
  background: var(--paper-050);
  color: var(--ink-900);
  padding: var(--about-pad) 0;
}

.page-about .about-band .section__eyebrow {
  color: var(--line-steel);
}

.page-about .about-band h2 {
  color: var(--ink-950);
  font-size: clamp(1.45rem, 3.4vw, 2.15rem);
  margin-top: 0.4rem;
}

.page-about .about-band__grid {
  display: grid;
  gap: var(--about-gap);
}

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

.page-about .about-band__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--ink-800);
  filter: grayscale(1) contrast(1.06);
}

.page-about .about-band__figure figcaption {
  margin-top: 0.85rem;
  color: var(--line-steel);
  font-size: 0.78rem;
  line-height: 1.6;
}

.page-about .about-band__lead {
  margin: 0.9rem 0 0;
  color: #2b3d52;
  font-size: 0.95rem;
  line-height: 1.75;
}

.page-about .team {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.page-about .team__card {
  background: #ffffff;
  border: 1px solid var(--line-steel);
  padding: 1.1rem 1.15rem;
  transition: border-color var(--dur) ease-out, transform var(--dur) ease-out;
}

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

.page-about .team__title {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink-950);
}

.page-about .team__desc {
  margin: 0.5rem 0 0;
  color: #2b3d52;
  font-size: 0.86rem;
  line-height: 1.7;
}

.page-about .team__meta {
  margin: 0.75rem 0 0;
  padding-top: 0.6rem;
  border-top: 1px solid #d3dce6;
  color: var(--line-steel);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
}

/* ---------- 层级切换 ---------- */
.page-about .lv {
  margin-top: 2.25rem;
}

.page-about .lv__input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .lv__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.page-about .lv__tab {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--line-steel);
  color: var(--mist-300);
  transition: border-color var(--dur) ease-out, color var(--dur) ease-out;
}

.page-about .lv__tab:hover {
  border-color: var(--pulse-cyan);
  color: var(--text-white);
}

.page-about .lv__input:focus-visible ~ .lv__tabs .lv__tab {
  outline: 2px solid var(--pulse-cyan);
  outline-offset: 2px;
}

.page-about #lv-all:checked ~ .lv__tabs label[for="lv-all"],
.page-about #lv-cs:checked ~ .lv__tabs label[for="lv-cs"],
.page-about #lv-cj:checked ~ .lv__tabs label[for="lv-cj"],
.page-about #lv-cy:checked ~ .lv__tabs label[for="lv-cy"],
.page-about #lv-city:checked ~ .lv__tabs label[for="lv-city"],
.page-about #lv-more:checked ~ .lv__tabs label[for="lv-more"] {
  border-color: var(--signal-amber);
  color: var(--signal-amber);
  background: rgba(255, 138, 61, 0.08);
}

.page-about .lv__panel {
  display: none;
  max-width: 48rem;
}

.page-about .lv__panel p {
  margin: 0;
  color: var(--mist-300);
  font-size: 0.9rem;
  line-height: 1.75;
}

.page-about .lv__fields {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.page-about #lv-all:checked ~ .lv__panels .lv__panel--all,
.page-about #lv-cs:checked ~ .lv__panels .lv__panel--cs,
.page-about #lv-cj:checked ~ .lv__panels .lv__panel--cj,
.page-about #lv-cy:checked ~ .lv__panels .lv__panel--cy,
.page-about #lv-city:checked ~ .lv__panels .lv__panel--city,
.page-about #lv-more:checked ~ .lv__panels .lv__panel--more {
  display: block;
}

/* ---------- 48 队网格 ---------- */
.page-about .tiles {
  margin-top: 2.25rem;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-steel);
  border: 1px solid var(--line-steel);
}

.page-about .tiles__cell {
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--ink-950);
  color: var(--line-steel);
  font-size: 0.68rem;
  letter-spacing: 0.02em;
  transition: background var(--dur) ease-out, color var(--dur) ease-out;
}

.page-about .tiles__cell:hover {
  background: var(--ink-800);
  color: var(--pulse-cyan);
}

/* ---------- 合作 ---------- */
.page-about .coop {
  margin-top: 2.25rem;
}

.page-about .coop__card {
  border-top: 2px solid var(--signal-amber);
  border-bottom: 1px solid var(--line-steel);
  padding: 1.1rem 0 1.35rem;
  transition: border-bottom-color var(--dur) ease-out;
}

.page-about .coop__card:hover {
  border-bottom-color: var(--pulse-cyan);
}

.page-about .coop__num {
  margin: 0;
  color: var(--signal-amber);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
}

.page-about .coop__title {
  margin: 0.5rem 0 0;
  font-family: var(--font-sans);
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--text-white);
}

.page-about .coop__desc {
  margin: 0.55rem 0 0;
  color: var(--mist-300);
  font-size: 0.86rem;
  line-height: 1.75;
}

.page-about .coop__foot {
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line-steel);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
}

.page-about .coop__contact {
  margin: 0;
  color: var(--mist-300);
  font-size: 0.86rem;
  line-height: 1.7;
}

.page-about .coop__link {
  color: var(--pulse-cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-steel);
  transition: border-color var(--dur) ease-out, color var(--dur) ease-out;
}

.page-about .coop__link:hover,
.page-about .coop__link:focus-visible {
  color: var(--signal-amber);
  border-bottom-color: var(--signal-amber);
}

.page-about .coop__link:focus-visible {
  outline: 2px solid var(--pulse-cyan);
  outline-offset: 2px;
}

/* ---------- 响应时效 ---------- */
.page-about .about-band--sla .about-sla {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-sla__copy p {
  margin: 0.9rem 0 0;
  color: #2b3d52;
  font-size: 0.94rem;
  line-height: 1.8;
}

.page-about .about-sla__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.page-about .about-band--sla .coop__link {
  color: #1d4b57;
  border-bottom-color: #9fb3c6;
}

.page-about .about-band--sla .coop__link:hover,
.page-about .about-band--sla .coop__link:focus-visible {
  color: #b8541a;
  border-bottom-color: #b8541a;
}

.page-about .about-sla__sep {
  color: var(--line-steel);
}

.page-about .sla {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: #cdd8e2;
  border: 1px solid #cdd8e2;
}

.page-about .sla__item {
  background: #ffffff;
  padding: 1rem 1.1rem;
  display: grid;
  gap: 0.35rem;
}

.page-about .sla__num {
  color: var(--ink-950);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.page-about .sla__label {
  color: #46586e;
  font-size: 0.82rem;
  line-height: 1.65;
}

/* ---------- 桌面栅格 ---------- */
@media (min-width: 62rem) {
  .page-about .about-hero__grid {
    grid-template-columns: 5fr 7fr;
    align-items: center;
  }

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

  .page-about .about-band__grid {
    grid-template-columns: 5fr 7fr;
    align-items: start;
  }

  .page-about .team {
    gap: 0.75rem;
  }

  .page-about .flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
    background: var(--line-steel);
    border: 1px solid var(--line-steel);
  }

  .page-about .flow__step {
    border: 0;
  }

  .page-about .tiles {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .grid--3.coop {
    gap: 2rem;
  }

  .page-about .about-band--sla .about-sla {
    grid-template-columns: 6fr 6fr;
    align-items: start;
  }
}

@media (min-width: 60rem) {
  .page-about .tl {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 1.5rem;
    padding: 2.75rem 0 0;
  }

  .page-about .tl::before {
    left: 0;
    right: 0;
    top: 0.5rem;
    bottom: auto;
    width: auto;
    height: 1px;
  }

  .page-about .tl__dot {
    left: 0;
    top: -2.35rem;
  }
}

@media (hover: hover) and (min-width: 60rem) {
  .page-about .tl__note {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height var(--dur) ease-out, opacity var(--dur) ease-out;
  }

  .page-about .tl__node:hover .tl__note,
  .page-about .tl__node:focus .tl__note,
  .page-about .tl__node:focus-within .tl__note {
    max-height: 6rem;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__dot,
  .page-about .tl__note,
  .page-about .flow__step,
  .page-about .team__card,
  .page-about .coop__card,
  .page-about .tiles__cell,
  .page-about .lv__tab,
  .page-about .coop__link {
    transition: none;
  }

  .page-about .team__card:hover {
    transform: none;
  }
}