.page-about {
  --about-radius: var(--radius-xl);
  --about-pad: clamp(1rem, 3vw, 1.6rem);
  display: block;
}

/* ---------- 首屏封面 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(1.8rem, 5vw, 3.6rem) clamp(1.4rem, 3vw, 2.2rem);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -18%;
  width: min(62vw, 520px);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%, rgba(200, 255, 77, 0.16), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: min(38vw, 320px);
  height: 2px;
  background: linear-gradient(90deg, var(--lime), transparent);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: 1rem;
}

.page-about .about-hero__kicker {
  margin: 0;
  color: var(--text-dim);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 8.4vw, 4.4rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.page-about .about-hero__hl {
  color: var(--lime);
  position: relative;
  white-space: nowrap;
}

.page-about .about-hero__hl::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.06em;
  height: 0.1em;
  background: linear-gradient(90deg, var(--lime), var(--amber));
  opacity: 0.55;
  transform: skewX(-18deg);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(0.95rem, 2.6vw, 1.06rem);
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-hero__tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    grid-template-areas:
      "kicker tags"
      "title  tags"
      "lede   tags";
    align-items: end;
    column-gap: 2.5rem;
    row-gap: 1.1rem;
  }
  .page-about .about-hero__kicker { grid-area: kicker; }
  .page-about .about-hero__title { grid-area: title; }
  .page-about .about-hero__lede { grid-area: lede; }
  .page-about .about-hero__tags {
    grid-area: tags;
    align-self: end;
    justify-content: flex-end;
  }
}

/* ---------- 数据条 ---------- */
.page-about .about-metrics {
  background: var(--bg-alt);
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-metrics__item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1rem clamp(0.7rem, 2.4vw, 1.4rem);
  border-left: 1px solid var(--line);
  border-top: 1px solid var(--line);
}

.page-about .about-metrics__item:nth-child(odd) {
  border-left: 0;
}

.page-about .about-metrics__num {
  font-size: clamp(1.7rem, 6vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
  letter-spacing: -0.02em;
}

.page-about .about-metrics__unit {
  font-size: 0.5em;
  margin-left: 0.1em;
  color: var(--amber);
}

.page-about .about-metrics__label {
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  line-height: 1.5;
}

@media (min-width: 760px) {
  .page-about .about-metrics__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-metrics__item {
    border-top: 0;
  }
  .page-about .about-metrics__item:nth-child(odd) {
    border-left: 1px solid var(--line);
  }
  .page-about .about-metrics__item:first-child {
    border-left: 0;
  }
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(1.2rem, 4vw, 2.6rem);
  padding-block: clamp(1.4rem, 4vw, 3rem);
}

.page-about .about-toc {
  min-width: 0;
}

.page-about .about-toc__title {
  margin: 0 0 0.6rem;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0.4rem;
  display: flex;
  gap: 0.45rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  white-space: nowrap;
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  color: var(--text);
  font-size: 0.82rem;
  text-decoration: none;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .about-toc__link .num-mono {
  font-size: 0.7rem;
  color: var(--text-dim);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  border-color: var(--lime);
  color: var(--lime);
  background: rgba(200, 255, 77, 0.08);
}

.page-about .about-main {
  min-width: 0;
}

@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: 172px minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-toc {
    position: sticky;
    top: calc(var(--topbar-h) + 1.6rem);
    padding-top: 0.2rem;
  }
  .page-about .about-toc__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
    gap: 0.2rem;
  }
  .page-about .about-toc__link {
    border: 0;
    border-radius: 0;
    padding: 0.45rem 0 0.45rem 0.75rem;
    border-left: 2px solid var(--line);
    white-space: normal;
  }
  .page-about .about-toc__link:hover,
  .page-about .about-toc__link:focus-visible {
    background: transparent;
    border-left-color: var(--lime);
  }
}

/* ---------- 分区通用 ---------- */
.page-about .about-section {
  border-top: 1px solid var(--line);
  padding-block: clamp(1.5rem, 4vw, 2.6rem);
  scroll-margin-top: calc(var(--topbar-h) + 1.2rem);
}

.page-about .about-main > .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-section:target .about-section__title {
  color: var(--lime);
}

.page-about .about-section__head {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: clamp(0.9rem, 2.4vw, 1.4rem);
}

.page-about .about-section__num {
  font-size: clamp(1.5rem, 5.5vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: transparent;
  -webkit-text-stroke: 1px var(--lime);
  flex: none;
}

.page-about .about-section__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.25rem, 4.2vw, 1.9rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  transition: color 0.2s var(--ease);
}

.page-about .about-copy p {
  margin: 0 0 0.85rem;
  max-width: 66ch;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-copy p:last-child {
  margin-bottom: 0;
}

/* ---------- 品牌坐标 ---------- */
.page-about .about-coord {
  display: grid;
  gap: 1.4rem;
}

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

.page-about .about-figure .media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 0.6rem;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--text-dim);
}

@media (min-width: 840px) {
  .page-about .about-coord {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
    gap: 2.2rem;
  }
  .page-about .about-figure {
    margin-top: 0.35rem;
  }
}

/* ---------- 四组分工 ---------- */
.page-about .about-crew {
  display: grid;
  gap: 0.8rem;
  margin-top: 1.2rem;
}

.page-about .about-crew__card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.15rem 1.2rem;
  overflow: hidden;
}

.page-about .about-crew__card::after {
  content: "";
  position: absolute;
  right: -30px;
  bottom: -30px;
  width: 90px;
  height: 90px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(200, 255, 77, 0.12), transparent 70%);
  pointer-events: none;
}

.page-about .about-crew__idx {
  margin: 0 0 0.5rem;
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: var(--text-dim);
}

.page-about .about-crew__title {
  margin: 0 0 0.5rem;
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--lime);
}

.page-about .about-crew__desc {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--text);
}

@media (min-width: 700px) {
  .page-about .about-crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1040px) {
  .page-about .about-crew {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 1rem 1.2rem;
  }
  .page-about .about-crew__card:nth-child(1) { grid-column: 1 / span 6; }
  .page-about .about-crew__card:nth-child(2) { grid-column: 8 / span 5; margin-top: 1.9rem; }
  .page-about .about-crew__card:nth-child(3) { grid-column: 2 / span 5; }
  .page-about .about-crew__card:nth-child(4) { grid-column: 7 / span 6; margin-top: 1.9rem; }
}

/* ---------- 斜切时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin-top: 1.3rem;
  padding-left: 1.75rem;
  display: grid;
  gap: 0.85rem;
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  opacity: 0.13;
  pointer-events: none;
}

.page-about .about-timeline__bg img {
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  display: block;
}

.page-about .about-timeline__rail {
  position: absolute;
  top: 0.5rem;
  bottom: 0.5rem;
  left: 0.28rem;
  width: 0.62rem;
  height: auto;
  transform: skewX(-9deg);
  transform-origin: top center;
  opacity: 0.85;
  z-index: 1;
  pointer-events: none;
}

.page-about .about-node {
  position: relative;
  z-index: 1;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 0.9rem 1rem 1rem;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -1.58rem;
  top: 1.15rem;
  width: 0.62rem;
  height: 0.62rem;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 3px rgba(200, 255, 77, 0.16);
}

.page-about .about-node--stage::before {
  background: var(--amber);
  box-shadow: 0 0 0 3px rgba(255, 176, 32, 0.18);
}

.page-about .about-node:hover,
.page-about .about-node:focus-within {
  border-color: var(--line-strong);
  background: var(--surface-2);
  transform: translateX(3px);
}

.page-about .about-node__stage {
  margin: 0 0 0.35rem;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--text-dim);
}

.page-about .about-node__title {
  margin: 0 0 0.35rem;
  font-size: 0.98rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}

.page-about .about-node__desc {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--text-dim);
}

@media (min-width: 860px) {
  .page-about .about-timeline {
    padding-left: 2.4rem;
    gap: 1rem;
  }
  .page-about .about-node {
    padding: 1rem 1.2rem 1.1rem;
  }
  .page-about .about-node::before {
    left: -2.16rem;
  }
  .page-about .about-timeline__rail {
    left: 0.62rem;
  }
}

/* ---------- 合作与荣誉 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 0.85rem;
  margin-top: 1.2rem;
}

.page-about .about-partner {
  position: relative;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1.05rem 1.15rem 1.15rem;
}

.page-about .about-partner__kicker {
  margin: 0 0 0.5rem;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ice);
}

.page-about .about-partner__num {
  margin: 0;
  font-size: clamp(2rem, 7vw, 3rem);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-partner__label {
  margin: 0.3rem 0 0.55rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
}

.page-about .about-partner__desc {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--text-dim);
}

@media (min-width: 820px) {
  .page-about .about-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-partner--wide {
    grid-column: 1 / -1;
  }
}

.page-about .about-honors {
  margin-top: 1.6rem;
  position: relative;
  padding-top: 1.2rem;
  border-top: 1px dashed var(--line-strong);
}

.page-about .about-honors__title {
  margin: 0 0 0.75rem;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.page-about .about-seals {
  display: grid;
  gap: 0.7rem;
}

.page-about .about-seal {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.8rem 1rem;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-pill);
  background:
    radial-gradient(circle at 88% 20%, rgba(200, 255, 77, 0.1), transparent 62%),
    var(--surface);
}

.page-about .about-seal__year {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--lime);
  flex: none;
}

.page-about .about-seal__text {
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text);
}

@media (min-width: 680px) {
  .page-about .about-seals {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 品质流程 ---------- */
.page-about .about-quality__steps {
  list-style: none;
  margin: 1.2rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.page-about .about-step {
  padding: 0.15rem 0 0.15rem 0.95rem;
  border-left: 2px solid var(--line-strong);
  transition: border-color 0.2s var(--ease);
}

.page-about .about-step:nth-child(1) { border-left-color: var(--lime); }
.page-about .about-step:nth-child(2) { border-left-color: var(--ice); }
.page-about .about-step:nth-child(3) { border-left-color: var(--amber); }

.page-about .about-step__idx {
  margin: 0 0 0.3rem;
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--text-dim);
}

.page-about .about-step__title {
  margin: 0 0 0.3rem;
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-step__desc {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--text-dim);
}

@media (min-width: 820px) {
  .page-about .about-quality__steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.2rem;
  }
}

.page-about .about-sla {
  list-style: none;
  margin: 1.4rem 0 0;
  padding: 0.9rem 1rem;
  display: grid;
  gap: 0.6rem 1rem;
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.page-about .about-sla__item {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
}

.page-about .about-sla__num {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--amber);
  flex: none;
  min-width: 3.4em;
}

.page-about .about-sla__text {
  font-size: 0.83rem;
  line-height: 1.6;
  color: var(--text);
}

@media (min-width: 760px) {
  .page-about .about-sla {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-sla__item {
    flex-direction: column;
    gap: 0.25rem;
  }
}

/* ---------- 联系与合作 ---------- */
.page-about .about-section--contact {
  padding-bottom: clamp(1.6rem, 5vw, 3rem);
}

.page-about .about-actions {
  display: grid;
  gap: 0.7rem;
  margin-top: 1.1rem;
}

.page-about .about-action {
  display: grid;
  gap: 0.3rem;
  padding: 0.95rem 1.05rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-action:hover,
.page-about .about-action:focus-visible {
  border-color: var(--lime);
  background: var(--surface-2);
  transform: translateY(-2px);
}

.page-about .about-action__title {
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--lime);
}

.page-about .about-action__desc {
  font-size: 0.84rem;
  line-height: 1.65;
  color: var(--text-dim);
}

.page-about .about-action__go {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--ice);
}

@media (min-width: 760px) {
  .page-about .about-actions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.8rem;
  }
}

.page-about .about-channels {
  margin: 1.5rem 0 0;
  padding: 1rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg-alt);
  display: grid;
  gap: 0.75rem;
}

.page-about .about-channels__row {
  display: grid;
  gap: 0.2rem;
}

.page-about .about-channels dt {
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.page-about .about-channels dd {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text);
  overflow-wrap: anywhere;
}

@media (min-width: 760px) {
  .page-about .about-channels {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem 1.4rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-action,
  .page-about .about-node,
  .page-about .about-toc__link,
  .page-about .about-section__title {
    transition: none;
  }
  .page-about .about-action:hover,
  .page-about .about-action:focus-visible,
  .page-about .about-node:hover,
  .page-about .about-node:focus-within {
    transform: none;
  }
}