.page-about {
  --about-notch: 14px;
  --about-gap: clamp(20px, 3vw, 32px);
  background: var(--ink-950);
  color: var(--text-100);
}

.page-about .breadcrumb {
  padding: 18px 0 4px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 26px) 0 clamp(28px, 4vw, 48px);
  border-bottom: 1px solid var(--ink-700);
  background:
    radial-gradient(110% 80% at 86% 2%, rgba(43, 232, 176, 0.14), transparent 62%),
    radial-gradient(90% 70% at 4% 98%, rgba(110, 91, 255, 0.13), transparent 60%),
    linear-gradient(180deg, var(--ink-950) 0%, var(--ink-850) 100%);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    180deg,
    rgba(233, 238, 247, 0.035) 0px,
    rgba(233, 238, 247, 0.035) 1px,
    transparent 1px,
    transparent 6px
  );
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: end;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-cond);
  font-size: clamp(34px, 6.4vw, 68px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 800;
  max-width: 15em;
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 34em;
  color: var(--text-100);
}

.page-about .about-hero__meta {
  margin: 14px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--signal-400);
  color: var(--text-400);
  font-size: 15px;
  line-height: 1.7;
}

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

.page-about .about-hero__media {
  margin: 0;
  border: 1px solid var(--ink-700);
  background: var(--ink-850);
  clip-path: polygon(0 0, calc(100% - var(--about-notch)) 0, 100% var(--about-notch), 100% 100%, var(--about-notch) 100%, 0 calc(100% - var(--about-notch)));
  overflow: hidden;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
  opacity: 0.92;
}

.page-about .about-stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 20px;
  margin: clamp(28px, 4vw, 46px) 0 0;
}

.page-about .about-stats > div {
  padding-top: 10px;
  border-top: 2px solid var(--ink-700);
}

.page-about .about-stats > div:nth-child(1) { border-top-color: var(--signal-400); }
.page-about .about-stats > div:nth-child(2) { border-top-color: var(--score-400); }
.page-about .about-stats > div:nth-child(3) { border-top-color: var(--index-500); }
.page-about .about-stats > div:nth-child(4) { border-top-color: var(--signal-200); }
.page-about .about-stats > div:nth-child(5) { border-top-color: var(--score-600); }

.page-about .about-stats dt {
  color: var(--text-400);
  font-size: 13px;
  letter-spacing: 0.04em;
}

.page-about .about-stats dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 30px);
  font-weight: 700;
  color: var(--text-100);
  font-variant-numeric: tabular-nums;
}

/* ---------- 主体骨架 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-about .about-toc {
  padding-top: clamp(24px, 3vw, 40px);
}

.page-about .about-toc__title {
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--text-400);
  text-transform: uppercase;
}

.page-about .about-toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc__list li {
  flex: 0 0 auto;
}

.page-about .about-toc__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 13px;
  border: 1px solid var(--ink-700);
  background: var(--ink-850);
  color: var(--text-100);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  transition: border-color 180ms ease, color 180ms ease, background-color 180ms ease;
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  border-color: var(--signal-400);
  color: var(--signal-200);
  background: var(--ink-800);
}

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

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding: clamp(32px, 5vw, 56px) 0;
  border-top: 1px solid var(--ink-700);
}

.page-about .about-section--last {
  border-bottom: 1px solid var(--ink-700);
}

.page-about .about-sec-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 14px;
  margin-bottom: 20px;
}

.page-about .about-sec-head h2 {
  margin: 0;
  font-size: clamp(22px, 3.2vw, 32px);
}

.page-about .about-sec-note {
  margin: 0;
  color: var(--text-400);
  font-size: 14px;
}

.page-about .about-copy {
  margin: 0 0 18px;
  max-width: 46em;
  color: var(--text-100);
  line-height: 1.85;
}

.page-about .about-copy--tight {
  margin: 12px 0 0;
  font-size: 15px;
  color: var(--text-400);
}

.page-about .about-note {
  margin: 20px 0 0;
  padding: 12px 16px;
  border-left: 2px solid var(--index-500);
  background: rgba(110, 91, 255, 0.08);
  color: var(--text-400);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .about-inline-link {
  color: var(--signal-200);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 三件事 ---------- */
.page-about .about-trio {
  display: grid;
  gap: 16px;
  margin-top: 26px;
}

.page-about .about-trio__item {
  position: relative;
  padding: 22px 20px 20px;
  background: var(--ink-850);
  border: 1px solid var(--ink-700);
  border-left-width: 3px;
  clip-path: polygon(0 0, calc(100% - var(--about-notch)) 0, 100% var(--about-notch), 100% 100%, 0 100%);
}

.page-about .about-trio__item--signal { border-left-color: var(--signal-400); }
.page-about .about-trio__item--score { border-left-color: var(--score-400); }
.page-about .about-trio__item--index { border-left-color: var(--index-500); }

.page-about .about-trio__item h3 {
  margin: 0 0 10px;
  font-size: 19px;
}

.page-about .about-trio__item p {
  margin: 0 0 14px;
  color: var(--text-400);
  line-height: 1.8;
  font-size: 15px;
}

.page-about .about-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--signal-200);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 232, 176, 0.4);
  padding-bottom: 2px;
}

.page-about .about-link::after {
  content: "→";
  font-family: var(--font-mono);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--signal-400);
  border-bottom-color: var(--signal-400);
}

.page-about .about-forms {
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px dashed var(--ink-700);
}

.page-about .about-forms__title {
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--text-400);
}

.page-about .about-forms__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-forms__list li {
  padding: 6px 12px;
  border: 1px solid var(--ink-700);
  background: var(--ink-800);
  color: var(--text-100);
  font-size: 14px;
}

/* ---------- 生产流程 ---------- */
.page-about .about-pipeline {
  display: grid;
  gap: 14px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.page-about .about-step {
  position: relative;
  padding: 18px 18px 18px 20px;
  background: linear-gradient(90deg, rgba(255, 178, 63, 0.08), transparent 60%), var(--ink-850);
  border: 1px solid var(--ink-700);
}

.page-about .about-step__code {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  margin-bottom: 10px;
  background: var(--score-400);
  color: var(--ink-950);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
}

.page-about .about-step h3 {
  margin: 0 0 8px;
  font-size: 17px;
}

.page-about .about-step p {
  margin: 0;
  color: var(--text-400);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 版本演进 ---------- */
.page-about .about-figure {
  margin: 22px 0 8px;
  border: 1px solid var(--ink-700);
  background: var(--ink-850);
  clip-path: polygon(0 0, calc(100% - var(--about-notch)) 0, 100% var(--about-notch), 100% 100%, 0 100%);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 40 / 13;
  object-fit: cover;
}

.page-about .about-figure__caption {
  padding: 12px 16px;
  color: var(--text-400);
  font-size: 13px;
  border-top: 1px solid var(--ink-700);
}

.page-about .about-track {
  position: relative;
  display: grid;
  gap: 16px;
  margin-top: 30px;
  padding-top: 34px;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  top: 14px;
  left: 6px;
  right: 6px;
  height: 2px;
  background: linear-gradient(90deg, var(--signal-400), var(--index-500), var(--score-400));
  opacity: 0.75;
}

.page-about .about-milestone {
  position: relative;
  padding: 20px 18px;
  background: var(--ink-850);
  border: 1px solid var(--ink-700);
  clip-path: polygon(0 0, calc(100% - var(--about-notch)) 0, 100% var(--about-notch), 100% 100%, 0 100%);
}

.page-about .about-milestone::before {
  content: "";
  position: absolute;
  top: -26px;
  left: 18px;
  width: 12px;
  height: 12px;
  background: var(--score-400);
  box-shadow: 0 0 0 4px var(--ink-950);
}

.page-about .about-milestone:nth-child(2)::before { background: var(--signal-400); }
.page-about .about-milestone:nth-child(3)::before { background: var(--index-500); }
.page-about .about-milestone:nth-child(4)::before { background: var(--score-600); }

.page-about .about-milestone__ver {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--score-400);
}

.page-about .about-milestone h3 {
  margin: 0 0 8px;
  font-size: 17px;
}

.page-about .about-milestone p {
  margin: 0;
  color: var(--text-400);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  margin-bottom: 24px;
}

.page-about .about-team-blocks {
  display: grid;
  gap: 14px;
}

.page-about .about-team-block {
  padding: 18px;
  background: var(--ink-850);
  border: 1px solid var(--ink-700);
  border-top: 3px solid var(--signal-400);
}

.page-about .about-team-block:nth-child(2) { border-top-color: var(--score-400); }
.page-about .about-team-block:nth-child(3) { border-top-color: var(--index-500); }

.page-about .about-team-block__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--text-100);
}

.page-about .about-team-block h3 {
  margin: 10px 0 8px;
  font-size: 17px;
}

.page-about .about-team-block p {
  margin: 0 0 16px;
  color: var(--text-400);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-team-block__bar {
  height: 6px;
  background: var(--ink-800);
  border: 1px solid var(--ink-700);
}

.page-about .about-team-block__fill {
  display: block;
  height: 100%;
}

.page-about .about-team-block__fill--signal { width: 57%; background: var(--signal-400); }
.page-about .about-team-block__fill--score { width: 25%; background: var(--score-400); }
.page-about .about-team-block__fill--index { width: 18%; background: var(--index-500); }

.page-about .about-team__figure {
  margin: 0;
  border: 1px solid var(--ink-700);
  background: var(--ink-850);
  clip-path: polygon(0 0, calc(100% - var(--about-notch)) 0, 100% var(--about-notch), 100% 100%, var(--about-notch) 100%, 0 calc(100% - var(--about-notch)));
  overflow: hidden;
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 25 / 16;
  object-fit: cover;
}

/* ---------- 合作 ---------- */
.page-about .about-coop {
  display: grid;
  gap: 14px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-coop__item {
  padding: 20px 18px;
  background: var(--ink-850);
  border: 1px solid var(--ink-700);
}

.page-about .about-coop__item h3 {
  margin: 12px 0 8px;
  font-size: 17px;
}

.page-about .about-coop__item p {
  margin: 0;
  color: var(--text-400);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 主体信息 ---------- */
.page-about .about-filing {
  padding: clamp(20px, 3vw, 28px);
  background:
    linear-gradient(120deg, rgba(43, 232, 176, 0.09), transparent 55%),
    var(--ink-850);
  border: 1px solid var(--ink-700);
  clip-path: polygon(0 0, calc(100% - var(--about-notch)) 0, 100% var(--about-notch), 100% 100%, var(--about-notch) 100%, 0 calc(100% - var(--about-notch)));
}

.page-about .about-filing__row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 6px 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--ink-700);
}

.page-about .about-filing__key {
  color: var(--text-400);
  font-size: 14px;
}

.page-about .about-filing__val {
  font-size: 16px;
  color: var(--text-100);
}

.page-about .about-filing__note {
  margin: 16px 0 0;
  color: var(--text-400);
  font-size: 14px;
  line-height: 1.7;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(32px, 5vw, 56px);
  padding: clamp(24px, 4vw, 40px);
  background:
    linear-gradient(135deg, rgba(110, 91, 255, 0.18), rgba(43, 232, 176, 0.1)),
    var(--ink-850);
  border: 1px solid var(--ink-700);
  clip-path: polygon(0 0, calc(100% - var(--about-notch)) 0, 100% var(--about-notch), 100% 100%, var(--about-notch) 100%, 0 calc(100% - var(--about-notch)));
}

.page-about .about-cta h2 {
  margin: 0 0 10px;
  font-size: clamp(21px, 3vw, 30px);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 40em;
  color: var(--text-400);
  line-height: 1.8;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 渐显 ---------- */
.page-about [data-reveal] {
  opacity: 1;
}

.page-about .has-js [data-reveal]:not([data-revealed]) {
  opacity: 0;
  transform: translateY(14px);
}

.page-about .has-js [data-reveal][data-revealed] {
  opacity: 1;
  transform: none;
  transition: opacity 420ms ease, transform 420ms ease;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-pipeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-coop {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 840px) {
  .page-about .about-stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
  .page-about .about-trio {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-team-blocks {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }
  .page-about .about-pipeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-team {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 1fr) 224px;
    column-gap: clamp(28px, 4vw, 56px);
  }
  .page-about .about-toc {
    grid-column: 2;
    grid-row: 1;
    position: sticky;
    top: calc(var(--header-h) + 22px);
    align-self: start;
    padding-top: clamp(32px, 5vw, 56px);
    border-top: 1px solid var(--ink-700);
  }
  .page-about .about-flow {
    grid-column: 1;
    grid-row: 1;
  }
  .page-about .about-toc__list {
    flex-direction: column;
    gap: 6px;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .about-toc__list a {
    width: 100%;
    white-space: normal;
    line-height: 1.5;
  }
  .page-about .about-team-blocks {
    padding-bottom: 40px;
  }
  .page-about .about-team-block:nth-child(2) { transform: translateY(18px); }
  .page-about .about-team-block:nth-child(3) { transform: translateY(36px); }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about .has-js [data-reveal]:not([data-revealed]) {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .page-about .about-toc__list a {
    transition: none;
  }
}