.page-about {
  --about-gap: clamp(56px, 8vw, 104px);
  --about-prose-width: 42em;
  display: block;
  background: var(--color-void);
  color: var(--color-text);
  font-family: var(--font-body);
  padding-bottom: calc(var(--scorebar-h) + var(--s7));
  overflow-x: clip;
}

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

/* ---------- 框景首屏 ---------- */
.page-about .about-frame {
  position: relative;
  margin: var(--s4) var(--gutter) 0;
  border: 3px solid var(--color-line);
  background:
    linear-gradient(158deg, var(--color-panel) 0%, var(--color-void) 64%);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .about-frame::after {
  content: "";
  position: absolute;
  top: -40%;
  right: -18%;
  width: 58%;
  height: 180%;
  background: linear-gradient(180deg, rgba(0, 230, 118, 0.14), rgba(41, 121, 255, 0.07));
  transform: skewX(-12deg);
  pointer-events: none;
}

.page-about .about-frame__rule {
  position: absolute;
  left: 0;
  right: 0;
  height: 10px;
  background-image: repeating-linear-gradient(to right, var(--color-line) 0 1px, transparent 1px 26px);
  pointer-events: none;
}

.page-about .about-frame__rule--top { top: 0; }
.page-about .about-frame__rule--bottom { bottom: 0; }

.page-about .about-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: var(--color-line);
  z-index: 2;
}

.page-about .about-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: var(--color-velocity);
}

.page-about .about-hero {
  position: relative;
  z-index: 1;
  padding-top: var(--s6);
  padding-bottom: var(--s6);
}

.page-about .about-hero__crumbs {
  margin-bottom: var(--s4);
}

.page-about .about-hero__eyebrow {
  display: inline-block;
  transform: skewX(-6deg);
  color: var(--color-velocity);
  letter-spacing: 0.14em;
  margin: 0 0 var(--s3);
}

.page-about .about-hero__title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(30px, 5.4vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 var(--s4);
  max-width: 18em;
}

.page-about .about-hero__accent {
  color: var(--color-velocity);
  box-shadow: inset 0 -0.18em 0 rgba(0, 230, 118, 0.24);
}

.page-about .about-hero__lede {
  max-width: var(--about-prose-width);
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.75;
  color: var(--color-muted);
  margin: 0;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--color-line);
  border: 2px solid var(--color-line);
  margin: var(--s5) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stats__cell {
  background: var(--color-void);
  padding: var(--s3);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-stats__value {
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 700;
  color: var(--color-velocity);
  letter-spacing: -0.02em;
  line-height: 1;
}

.page-about .about-stats__label {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.5;
}

/* ---------- 首屏横幅 ---------- */
.page-about .about-banner {
  margin: var(--s6) var(--gutter) 0;
  border: 3px solid var(--color-line);
  box-shadow: var(--shadow-hard-sm);
  background: var(--color-panel);
}

.page-about .about-banner img {
  width: 100%;
  object-fit: cover;
  aspect-ratio: 5 / 2;
}

.page-about .about-banner figcaption {
  border-top: 2px solid var(--color-line);
  padding: var(--s2) var(--s3);
  font-size: 13px;
  color: var(--color-muted);
}

/* ---------- 主体栅格 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s6);
  padding-top: var(--s7);
  align-items: start;
}

.page-about .about-toc {
  border: 2px solid var(--color-line);
  background: var(--color-panel);
  padding: var(--s3);
  display: flex;
  flex-wrap: nowrap;
  gap: var(--s2);
  overflow-x: auto;
}

.page-about .about-toc__title {
  display: none;
  color: var(--color-muted);
  font-size: 12px;
  letter-spacing: 0.12em;
  margin: 0 0 var(--s2);
}

.page-about .about-toc__link {
  flex: 0 0 auto;
  font-size: 13px;
  color: var(--color-muted);
  text-decoration: none;
  padding: 6px 10px;
  border: 1px solid var(--color-line);
  white-space: nowrap;
  transition: color 0.2s var(--ease-velocity), border-color 0.2s var(--ease-velocity);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--color-text);
  border-color: var(--color-velocity);
}

.page-about .about-toc__link.is-active {
  color: var(--color-velocity-deep);
  background: var(--color-velocity);
  border-color: var(--color-velocity);
  font-weight: 700;
}

/* ---------- 长文章节 ---------- */
.page-about .about-prose {
  max-width: var(--about-prose-width);
}

.page-about .about-sec {
  position: relative;
  padding-top: var(--about-gap);
}

.page-about .about-sec:first-child {
  padding-top: 0;
}

.page-about .about-sec + .about-sec::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 8px;
  border-top: 2px solid var(--color-line);
  background-image: repeating-linear-gradient(to right, var(--color-line) 0 2px, transparent 2px 18px);
}

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: var(--s3);
  margin-bottom: var(--s4);
}

.page-about .about-sec__num {
  color: var(--color-velocity);
  font-size: 14px;
  letter-spacing: 0.08em;
  flex: 0 0 auto;
}

.page-about .about-sec__title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0;
}

.page-about .about-prose p {
  font-size: 16px;
  line-height: 1.75;
  margin: 0 0 1.2em;
  color: var(--color-text);
}

.page-about .about-prose a {
  color: var(--color-data);
  text-decoration: none;
  border-bottom: 1px solid rgba(41, 121, 255, 0.5);
}

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

.page-about .about-quote {
  border: 3px solid var(--color-line);
  border-left: 4px solid var(--color-velocity);
  background: var(--color-panel);
  box-shadow: var(--shadow-hard-sm);
  padding: var(--s4);
  margin: 0 0 1.4em;
}

.page-about .about-quote__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
}

/* ---------- 分类体系 ---------- */
.page-about .about-tax {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s4);
  margin-bottom: var(--s4);
}

.page-about .about-line {
  border: 2px solid var(--color-line);
  border-left: 4px solid var(--color-velocity);
  background: var(--color-panel);
  padding: var(--s3) var(--s3) var(--s3) var(--s4);
  margin-bottom: var(--s3);
}

.page-about .about-line:last-child { margin-bottom: 0; }
.page-about .about-line--data { border-left-color: var(--color-data); }
.page-about .about-line--alert { border-left-color: var(--color-alert); }

.page-about .about-line__key {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--color-muted);
}

.page-about .about-line__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 18px;
  margin: 0 0 8px;
  color: var(--color-text);
}

.page-about .about-line p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-muted);
}

.page-about .about-tax__figure {
  margin: 0;
  border: 3px solid var(--color-line);
  background: var(--color-pitch);
  align-self: start;
}

.page-about .about-tax__figure img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-about .about-tax__figure figcaption {
  border-top: 2px solid var(--color-line);
  padding: var(--s2) var(--s3);
  font-size: 13px;
  color: var(--color-muted);
  background: var(--color-panel);
}

/* ---------- 演进阶段 ---------- */
.page-about .about-stages {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s5);
  list-style: none;
  margin: 0 0 var(--s4);
  padding: 0;
}

.page-about .about-stages__item {
  position: relative;
  padding-top: var(--s4);
  border-top: 2px solid var(--color-line);
}

.page-about .about-stages__node {
  position: absolute;
  top: -7px;
  left: 0;
  width: 12px;
  height: 12px;
  background: var(--color-velocity);
}

.page-about .about-stages__phase {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--color-velocity);
}

.page-about .about-stages__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 18px;
  margin: 0 0 8px;
  color: var(--color-text);
}

.page-about .about-stages__item p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-muted);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s3);
  list-style: none;
  margin: 0 0 1.4em;
  padding: 0;
}

.page-about .about-team__card {
  border: 2px solid var(--color-line);
  background: var(--color-panel);
  padding: var(--s4);
  box-shadow: var(--shadow-hard-sm);
}

.page-about .about-team__name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 17px;
  margin: 0 0 10px;
  color: var(--color-velocity);
}

.page-about .about-team__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-muted);
}

/* ---------- 本地面向 ---------- */
.page-about .about-local__figure {
  margin: 0 0 var(--s4);
  border: 3px solid var(--color-line);
  background: var(--color-panel);
  box-shadow: var(--shadow-hard-sm);
}

.page-about .about-local__figure img {
  width: 100%;
  aspect-ratio: 12 / 7;
  object-fit: cover;
}

.page-about .about-local__figure figcaption {
  border-top: 2px solid var(--color-line);
  padding: var(--s2) var(--s3);
  font-size: 13px;
  color: var(--color-muted);
}

/* ---------- 受理范围 ---------- */
.page-about .about-scope {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s4);
  margin-bottom: 1.4em;
}

.page-about .about-scope__col {
  border: 2px solid var(--color-line);
  background: var(--color-panel);
  padding: var(--s4);
}

.page-about .about-scope__col--in {
  border-top: 4px solid var(--color-velocity);
}

.page-about .about-scope__col--out {
  border-top: 4px solid var(--color-alert);
  background: var(--color-void);
}

.page-about .about-scope__head {
  margin: 0 0 var(--s3);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--color-muted);
}

.page-about .about-scope__list {
  margin: 0;
  padding-left: 1.1em;
  display: grid;
  gap: 10px;
}

.page-about .about-scope__list li {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-muted);
}

.page-about .about-scope__list strong {
  color: var(--color-text);
  font-weight: 700;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 768px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-tax {
    grid-template-columns: minmax(0, 1fr) 260px;
    align-items: start;
  }

  .page-about .about-stages {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--s5) var(--s4);
  }

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

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

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: var(--s7);
  }

  .page-about .about-toc {
    position: sticky;
    top: 96px;
    flex-direction: column;
    flex-wrap: nowrap;
    overflow: visible;
    padding: var(--s4) var(--s3);
    border-left: 4px solid var(--color-velocity);
  }

  .page-about .about-toc__title {
    display: block;
  }

  .page-about .about-toc__link {
    border: none;
    border-left: 2px solid var(--color-line);
    padding: 6px 0 6px 12px;
    white-space: normal;
  }

  .page-about .about-toc__link.is-active {
    background: transparent;
    color: var(--color-velocity);
    border-left-color: var(--color-velocity);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__link,
  .page-about .about-prose a {
    transition: none;
  }
}