.page-about {
  display: block;
}

/* ---------- 首屏封面 ---------- */
.page-about .about-hero {
  padding: clamp(22px, 4vw, 44px) 0 clamp(40px, 8vw, 96px);
}

.page-about .about-hero__grid {
  align-items: start;
  row-gap: clamp(30px, 5vw, 56px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(34px, 6.6vw, 68px);
  line-height: 1.04;
  letter-spacing: -0.01em;
  color: var(--text);
  max-width: 15ch;
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 46ch;
  font-family: var(--font-body);
  font-size: clamp(16px, 1.9vw, 18.5px);
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-figures > li {
  background: var(--ink-2);
  padding: 16px 18px;
}

.page-about .about-figures__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 34px);
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--neon);
}

.page-about .about-figures__cap {
  display: block;
  margin-top: 7px;
  font-family: var(--font-ui);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--text-mute);
}

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

.page-about .about-hero__visual .media__frame {
  border: 1px solid var(--line);
  background: var(--ink-3);
}

.page-about .about-hero__visual .media__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-hero__note {
  margin: 16px 0 0;
  max-height: 190px;
  color: var(--violet);
  text-align: right;
}

/* ---------- 对页骨架 ---------- */
.page-about .about-shell {
  row-gap: clamp(40px, 6vw, 72px);
  align-items: stretch;
}

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

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

.page-about .about-index {
  position: sticky;
  top: 88px;
  border-left: 1px solid var(--line);
  padding: 4px 0 4px 20px;
}

.page-about .about-index__title {
  margin: 0 0 14px;
  font-family: var(--font-ui);
  font-size: 11.5px;
  letter-spacing: 0.24em;
  color: var(--text-mute);
}

.page-about .about-index ol {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

.page-about .about-index a {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 9px 0;
  font-family: var(--font-ui);
  font-size: 14px;
  color: var(--text-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--neon);
  border-bottom-color: var(--line);
}

.page-about .about-index__no {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--violet);
}

.page-about .about-index__foot {
  margin: 22px 0 0;
  font-family: var(--font-ui);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--text-mute);
}

.page-about .about-index__foot a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid var(--line-2);
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: clamp(30px, 5vw, 52px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-chapter::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 72px;
  height: 1px;
  background: var(--neon);
}

.page-about .about-chapter__head {
  display: flex;
  align-items: flex-start;
  gap: clamp(12px, 2vw, 26px);
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-chapter__no {
  flex: none;
  margin: 7px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--neon);
}

.page-about .about-chapter__title {
  flex: 1 1 auto;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.12;
  color: var(--text);
}

.page-about .about-chapter__title:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 4px;
}

.page-about .about-chapter__aside {
  flex: none;
  margin: 2px 0 0;
  writing-mode: vertical-rl;
  font-family: var(--font-ui);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--violet);
  opacity: 0.72;
  transition: opacity 160ms var(--ease);
}

.page-about .about-chapter__head:focus-within .about-chapter__aside {
  opacity: 1;
  color: var(--neon);
}

.page-about .about-chapter__body {
  max-width: 68ch;
}

.page-about .about-chapter__body p {
  margin: 0 0 16px;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.85;
  color: var(--text-dim);
}

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

.page-about .about-chapter__body a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid var(--line-2);
}

.page-about .about-chapter__body a:hover,
.page-about .about-chapter__body a:focus-visible {
  border-bottom-color: var(--neon);
}

/* ---------- 01 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0 0 0 34px;
  list-style: none;
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

.page-about .about-timeline__line {
  position: absolute;
  left: 0;
  top: 4px;
  width: 24px;
  height: calc(100% - 8px);
  pointer-events: none;
  overflow: visible;
}

.page-about .about-timeline__line polyline {
  fill: none;
  stroke: var(--line-2);
  stroke-width: 1.5;
}

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

.page-about .about-timeline__dot {
  position: absolute;
  left: -28px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--neon);
  transition: background 160ms var(--ease), box-shadow 160ms var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__dot {
  background: var(--neon);
  box-shadow: 0 0 0 5px rgba(34, 225, 214, 0.16);
}

.page-about .about-timeline__stage {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--neon);
}

.page-about .about-timeline__item h3 {
  margin: 6px 0 0;
  font-family: var(--font-ui);
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
}

.page-about .about-timeline__item p:last-child {
  margin: 8px 0 0;
  max-width: 56ch;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 02 岗位 ---------- */
.page-about .about-roles {
  display: grid;
  gap: 1px;
  margin-top: clamp(22px, 3vw, 30px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-role {
  background: var(--ink-2);
  padding: clamp(18px, 2.6vw, 26px);
  transition: background 160ms var(--ease);
}

.page-about .about-role:hover {
  background: var(--ink-3);
}

.page-about .about-role__tag {
  margin: 0 0 10px;
}

.page-about .about-role h3 {
  margin: 0;
  font-family: var(--font-ui);
  font-size: 16.5px;
  font-weight: 600;
  color: var(--text);
}

.page-about .about-role p:last-child {
  margin: 10px 0 0;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-roles__foot {
  margin: 18px 0 0;
  font-family: var(--font-ui);
  font-size: 13.5px;
  letter-spacing: 0.04em;
  color: var(--text-mute);
}

/* ---------- 03 评分（展陈米插页） ---------- */
.page-about .about-chapter--cream {
  position: relative;
  margin: clamp(24px, 4vw, 40px) 0;
  padding: clamp(26px, 4vw, 44px) clamp(20px, 3.4vw, 40px);
  background: var(--cream);
  color: var(--ink-text);
  border-top-color: var(--line-ink);
  overflow: hidden;
}

.page-about .about-chapter--cream::before {
  background: var(--clay);
}

.page-about .about-chapter--cream .about-chapter__title {
  color: var(--ink-text);
}

.page-about .about-chapter--cream .about-chapter__no {
  color: var(--clay);
}

.page-about .about-chapter--cream .about-chapter__aside {
  color: var(--ink-text-dim);
}

.page-about .about-chapter--cream .about-chapter__head:focus-within .about-chapter__aside {
  color: var(--ink-text);
}

.page-about .about-chapter--cream .about-chapter__body p {
  color: var(--ink-text-dim);
}

.page-about .about-score__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.14;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(circle at 62% 50%, #000, transparent 74%);
  mask-image: radial-gradient(circle at 62% 50%, #000, transparent 74%);
}

.page-about .about-chapter--cream > *:not(.about-score__bg) {
  position: relative;
  z-index: 1;
}

.page-about .about-score {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .about-score__dial {
  position: relative;
  width: min(260px, 72vw);
  aspect-ratio: 1 / 1;
  margin: 0 auto;
}

.page-about .about-score__ring {
  position: absolute;
  inset: 0;
}

.page-about .about-score__seg {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(from var(--a), var(--c) 0deg var(--s), transparent var(--s));
  -webkit-mask: radial-gradient(circle at 50% 50%, transparent 0 58%, #000 58% 100%);
  mask: radial-gradient(circle at 50% 50%, transparent 0 58%, #000 58% 100%);
  transition: filter 160ms var(--ease);
}

.page-about .about-score__seg:nth-child(1) { --a: 0deg;   --s: 108deg; --c: var(--neon); }
.page-about .about-score__seg:nth-child(2) { --a: 108deg; --s: 72deg;  --c: var(--neon); }
.page-about .about-score__seg:nth-child(3) { --a: 180deg; --s: 72deg;  --c: var(--neon); }
.page-about .about-score__seg:nth-child(4) { --a: 252deg; --s: 72deg;  --c: var(--neon); }
.page-about .about-score__seg:nth-child(5) { --a: 324deg; --s: 36deg;  --c: var(--clay); }

.page-about .about-score__seg:hover {
  filter: brightness(1.4) drop-shadow(0 0 10px var(--c));
}

.page-about .about-score__core {
  position: absolute;
  inset: 30%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.4vw, 38px);
  line-height: 1;
  color: var(--ink-text);
}

.page-about .about-score__core small {
  margin-top: 6px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--ink-text-dim);
}

.page-about .about-score__legend {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

.page-about .about-score__legend li {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 14px;
  padding: 12px 14px;
  background: rgba(20, 23, 27, 0.05);
  border-left: 2px solid var(--ink-text);
  transition: background 160ms var(--ease), transform 160ms var(--ease);
}

.page-about .about-score__legend li:hover {
  background: rgba(20, 23, 27, 0.1);
  transform: translateX(3px);
}

.page-about .about-score__name {
  font-family: var(--font-ui);
  font-size: 15.5px;
  font-weight: 600;
  color: var(--ink-text);
}

.page-about .about-score__pct {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--clay);
}

.page-about .about-score__desc {
  grid-column: 1 / -1;
  margin: 0;
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-text-dim);
}

.page-about .about-score__note {
  position: relative;
  z-index: 1;
  margin: 20px 0 0;
  max-width: 62ch;
  font-family: var(--font-ui);
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-text-dim);
}

/* ---------- 04 硬件实验室 ---------- */
.page-about .about-fields {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-fields li {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 12px 14px;
  background: var(--ink-2);
  font-family: var(--font-ui);
  font-size: 14px;
  color: var(--text-dim);
}

.page-about .about-fields li::before {
  content: "";
  flex: none;
  width: 6px;
  height: 6px;
  background: var(--steel);
  transform: rotate(45deg);
}

.page-about .about-lab__media {
  margin: clamp(24px, 3.6vw, 34px) 0;
}

.page-about .about-lab__media .media__frame {
  border: 1px solid var(--line);
  background: var(--ink-3);
}

.page-about .about-lab__media .media__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 05 产出流程 ---------- */
.page-about .about-flow-steps {
  counter-reset: step;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-flow-steps li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 16px;
  padding: 16px 18px;
  background: var(--ink);
  transition: background 160ms var(--ease);
}

.page-about .about-flow-steps li:hover {
  background: var(--ink-2);
}

.page-about .about-flow-steps li::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--neon);
}

.page-about .about-flow-steps h3 {
  margin: 0;
  font-family: var(--font-ui);
  font-size: 15.5px;
  font-weight: 600;
  color: var(--text);
}

.page-about .about-flow-steps p {
  grid-column: 2;
  margin: 4px 0 0;
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text-dim);
}

/* ---------- 06 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 1px;
  margin: clamp(20px, 3vw, 28px) 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-partners__cell {
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--ink-2);
}

.page-about .about-partners__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1;
  color: var(--violet);
}

.page-about .about-partners__cell h3 {
  margin: 12px 0 0;
  font-family: var(--font-ui);
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}

.page-about .about-partners__cell p:last-child {
  margin: 9px 0 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 07 纠错 ---------- */
.page-about .about-fix {
  padding: clamp(20px, 3vw, 28px);
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
}

.page-about .about-fix p {
  margin: 0 0 14px;
  max-width: 64ch;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-dim);
}

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

.page-about .about-fix a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid var(--line-2);
}

.page-about .about-fix a:hover,
.page-about .about-fix a:focus-visible {
  border-bottom-color: var(--neon);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding: clamp(38px, 6vw, 80px) 0 clamp(48px, 7vw, 96px);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 16px;
  padding-top: clamp(26px, 4vw, 44px);
  border-top: 1px solid var(--line);
}

.page-about .about-cta__title {
  margin: 0;
  max-width: 20ch;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.6vw, 42px);
  line-height: 1.12;
  color: var(--text);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 56ch;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-fields {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 760px) {
  .page-about .about-score {
    grid-template-columns: minmax(240px, 300px) minmax(0, 1fr);
    align-items: center;
  }

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

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

@media (max-width: 899px) {
  .page-about .about-index {
    position: static;
    border-left: 0;
    border-top: 1px solid var(--line);
    padding: 20px 0 0;
  }

  .page-about .about-index ol {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2px 18px;
  }
}

@media (max-width: 700px) {
  .page-about .about-chapter__head {
    flex-wrap: wrap;
    gap: 8px 14px;
  }

  .page-about .about-chapter__title {
    flex: 1 1 60%;
  }

  .page-about .about-chapter__aside {
    writing-mode: horizontal-tb;
    width: 100%;
    letter-spacing: 0.12em;
  }

  .page-about .about-hero__note {
    max-height: none;
    text-align: left;
  }

  .page-about .about-timeline {
    padding-left: 26px;
  }

  .page-about .about-timeline__dot {
    left: -22px;
  }

  .page-about .about-timeline__line {
    width: 20px;
  }

  .page-about .about-score__legend li:hover {
    transform: none;
  }
}

@media (max-width: 520px) {
  .page-about .about-figures {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-index ol {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-cta__actions .btn {
    width: 100%;
    text-align: center;
  }
}