.page-about {
  --about-gap: clamp(20px, 3vw, 40px);
  background:
    radial-gradient(circle at 84% 2%, rgba(85, 255, 184, 0.10), transparent 46%),
    radial-gradient(circle at 6% 38%, rgba(255, 200, 87, 0.06), transparent 40%),
    var(--hth-bg);
  color: var(--hth-ink);
  padding-block-start: clamp(88px, 11vw, 132px);
  padding-block-end: clamp(56px, 8vw, 100px);
  overflow-x: clip;
}

.page-about .hth-breadcrumb {
  padding-block: 16px 0;
  font-size: 12px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 36px);
  padding-block: clamp(26px, 4.5vw, 50px) clamp(30px, 5vw, 56px);
  border-bottom: 1px solid var(--hth-line);
}

@media (min-width: 1000px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 0.78fr);
    column-gap: clamp(36px, 5vw, 80px);
    align-items: end;
  }
}

.page-about .about-hero__eyebrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: 0 0 18px;
}

.page-about .about-hero__tag {
  display: inline-block;
  padding: 4px 12px;
  border: 1px solid var(--hth-accent);
  border-radius: var(--hth-radius-pill);
  color: var(--hth-accent);
  font-size: 12px;
  letter-spacing: 0.16em;
  background: rgba(85, 255, 184, 0.07);
}

.page-about .about-hero__range {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--hth-gold);
}

.page-about h1 {
  margin: 0;
  font-family: var(--hth-font-display);
  font-weight: 800;
  font-size: clamp(30px, 4.6vw, 58px);
  line-height: 1.12;
  letter-spacing: 0.01em;
  color: var(--hth-white);
  max-width: 20ch;
}

.page-about .about-hero__lede {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.55vw, 17px);
  line-height: 1.85;
  color: var(--hth-muted);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--hth-line);
  border: 1px solid var(--hth-line);
}

.page-about .about-stat {
  background: var(--hth-panel);
  padding: 14px 14px 16px;
  min-width: 0;
}

.page-about .about-stat dt {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--hth-muted);
  margin: 0;
}

.page-about .about-stat dd {
  margin: 8px 0 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
  flex-wrap: wrap;
}

.page-about .about-stat__num {
  font-size: clamp(21px, 2.6vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--hth-white);
}

.page-about .about-stat__unit {
  font-size: 12px;
  color: var(--hth-accent);
}

/* ---------- 主体双栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  padding-block-start: clamp(30px, 4.5vw, 60px);
}

@media (min-width: 1080px) {
  .page-about .about-body {
    grid-template-columns: 196px minmax(0, 1fr);
    column-gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 104px;
  }
}

.page-about .about-toc__title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--hth-muted);
}

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

@media (min-width: 1080px) {
  .page-about .about-toc__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 4px;
  }
}

.page-about .about-toc__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--hth-line);
  border-radius: var(--hth-radius-pill);
  color: var(--hth-muted);
  font-size: 13px;
  text-decoration: none;
  transition: color 120ms ease, border-color 120ms ease, background 120ms ease;
}

@media (min-width: 1080px) {
  .page-about .about-toc__list a {
    width: 100%;
    justify-content: flex-start;
    border-color: transparent;
    border-radius: 6px;
    border-left: 1px solid var(--hth-line);
    padding: 6px 10px;
  }
}

.page-about .about-toc__list a .hth-mono {
  font-size: 11px;
  color: var(--hth-accent);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--hth-bg);
  background: var(--hth-accent);
  border-color: var(--hth-accent);
}

.page-about .about-toc__list a:hover .hth-mono,
.page-about .about-toc__list a:focus-visible .hth-mono {
  color: var(--hth-bg);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding-block: clamp(30px, 4.5vw, 54px);
  border-top: 1px solid var(--hth-line);
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-block-start: 0;
}

.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 12px;
  row-gap: 8px;
  margin-bottom: clamp(18px, 2.4vw, 26px);
}

.page-about .about-chapter__idx {
  align-self: start;
  padding: 2px 7px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--hth-accent);
  border: 1px solid var(--hth-line);
  border-radius: 5px;
  background: rgba(85, 255, 184, 0.05);
}

.page-about .about-chapter__head h2 {
  margin: 0;
  font-family: var(--hth-font-display);
  font-weight: 700;
  font-size: clamp(22px, 3vw, 33px);
  line-height: 1.24;
  color: var(--hth-white);
}

.page-about .about-chapter__sub {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--hth-muted);
}

.page-about .about-chapter__cols {
  display: grid;
  gap: clamp(20px, 3vw, 28px);
}

@media (min-width: 900px) {
  .page-about .about-chapter--split .about-chapter__cols {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    column-gap: clamp(28px, 3.6vw, 48px);
    align-items: start;
  }
}

.page-about .about-chapter__text p,
.page-about .about-chapter__lead,
.page-about .about-chapter__tail,
.page-about .about-chapter__note p {
  margin: 0 0 14px;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.85;
  color: var(--hth-ink);
  max-width: 64ch;
}

.page-about .about-chapter__text p:last-child,
.page-about .about-chapter__note p:last-child,
.page-about .about-chapter__tail:last-child {
  margin-bottom: 0;
}

.page-about .about-chapter__note {
  margin-top: clamp(18px, 2.4vw, 26px);
  padding-left: 16px;
  border-left: 2px solid var(--hth-gold-deep);
}

.page-about .about-chapter__note p {
  color: var(--hth-muted);
  font-size: clamp(14px, 1.4vw, 15.5px);
}

.page-about .about-chapter__tail {
  margin-top: clamp(16px, 2.2vw, 24px);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--hth-line);
  background: var(--hth-panel);
  overflow: hidden;
}

.page-about .about-figure--wide {
  margin-top: clamp(20px, 2.8vw, 30px);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--wide img {
  aspect-ratio: 12 / 5;
}

.page-about .about-figure figcaption {
  padding: 9px 12px;
  border-top: 1px solid var(--hth-line);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--hth-muted);
}

/* ---------- 字段清单 ---------- */
.page-about .about-fields {
  list-style: none;
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  padding: 0;
  counter-reset: about-field;
  display: grid;
  gap: 1px;
  background: var(--hth-line);
  border: 1px solid var(--hth-line);
}

@media (min-width: 620px) {
  .page-about .about-fields {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-about .about-fields {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-fields li {
  background: var(--hth-panel);
  padding: 14px 16px 16px;
  min-width: 0;
  transition: background 140ms ease;
}

.page-about .about-fields li::before {
  counter-increment: about-field;
  content: counter(about-field, decimal-leading-zero);
  display: block;
  margin-bottom: 6px;
  font-family: var(--hth-font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--hth-accent);
}

.page-about .about-fields li:hover {
  background: #0E3529;
}

.page-about .about-fields strong {
  display: block;
  margin-bottom: 3px;
  font-size: 15px;
  font-weight: 600;
  color: var(--hth-white);
}

.page-about .about-fields span {
  display: block;
  font-size: 13px;
  line-height: 1.65;
  color: var(--hth-muted);
}

/* ---------- 团队角色 ---------- */
.page-about .about-roles {
  display: grid;
  gap: clamp(18px, 2.6vw, 26px);
}

@media (min-width: 720px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-role {
  padding-left: 16px;
  border-left: 2px solid var(--hth-line);
  transition: border-color 140ms ease;
}

.page-about .about-role:hover {
  border-left-color: var(--hth-accent);
}

.page-about .about-role__tag {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--hth-gold);
}

.page-about .about-role h3 {
  margin: 0 0 8px;
  font-family: var(--hth-font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--hth-white);
}

.page-about .about-role p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--hth-muted);
}

/* ---------- 校验流程 ---------- */
.page-about .about-flow {
  margin: clamp(20px, 2.8vw, 30px) 0 0;
  padding: clamp(16px, 2.2vw, 22px);
  border: 1px solid var(--hth-line);
  background: linear-gradient(180deg, rgba(11, 43, 34, 0.9), rgba(6, 28, 22, 0.9));
  overflow-x: auto;
}

.page-about .about-flow__svg {
  display: block;
  width: 100%;
  min-width: 500px;
  height: auto;
}

.page-about .about-flow__axis {
  stroke: var(--hth-line);
  stroke-width: 1;
  stroke-dasharray: 3 7;
}

.page-about .about-flow__box rect {
  fill: var(--hth-panel);
  stroke: var(--hth-line);
  stroke-width: 1;
}

.page-about .about-flow__arrow line {
  stroke: var(--hth-accent);
  stroke-width: 1.4;
}

.page-about .about-flow__head {
  fill: var(--hth-accent);
}

.page-about .about-flow__label text {
  fill: var(--hth-ink);
  font-family: var(--hth-font-body);
  font-size: 13px;
  text-anchor: middle;
}

.page-about .about-flow figcaption {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--hth-line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--hth-muted);
  min-width: 260px;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--hth-line);
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  column-gap: 14px;
  padding-block: 16px;
  border-bottom: 1px solid var(--hth-line);
}

.page-about .about-timeline__dot {
  position: absolute;
  top: 22px;
  left: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--hth-line);
}

.page-about .about-timeline__year {
  padding-left: 16px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--hth-gold);
}

.page-about .about-timeline__body h3 {
  margin: 0 0 5px;
  font-size: 15px;
  font-weight: 600;
  color: var(--hth-white);
}

.page-about .about-timeline__body p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--hth-muted);
}

.page-about .about-timeline__item--now .about-timeline__dot {
  background: var(--hth-accent);
  box-shadow: 0 0 0 4px rgba(85, 255, 184, 0.18);
}

.page-about .about-timeline__item--now .about-timeline__year {
  color: var(--hth-accent);
}

@media (min-width: 760px) {
  .page-about .about-timeline {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(178px, 1fr));
    border-top: 0;
    gap: 0 clamp(10px, 1.6vw, 20px);
    border-top: 1px solid var(--hth-line);
    padding-top: 22px;
    position: relative;
  }

  .page-about .about-timeline__item {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 8px;
    padding: 0 14px 18px 0;
    border-bottom: 0;
  }

  .page-about .about-timeline__dot {
    top: -25px;
    left: 0;
  }

  .page-about .about-timeline__year {
    padding-left: 0;
  }
}

/* ---------- 规模数据 ---------- */
.page-about .about-scale {
  display: grid;
  gap: 1px;
  background: var(--hth-line);
  border: 1px solid var(--hth-line);
}

@media (min-width: 720px) {
  .page-about .about-scale {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-about .about-scale {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-scale__item {
  background: var(--hth-panel);
  padding: clamp(16px, 2vw, 22px);
  min-width: 0;
}

.page-about .about-scale__num {
  margin: 0;
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--hth-gold);
}

.page-about .about-scale__unit {
  font-size: 14px;
  margin-left: 3px;
  color: var(--hth-muted);
}

.page-about .about-scale__label {
  margin: 10px 0 6px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--hth-ink);
}

.page-about .about-scale__desc {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--hth-muted);
}

/* ---------- 服务方向链接 ---------- */
.page-about .about-links {
  list-style: none;
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

@media (min-width: 860px) {
  .page-about .about-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }
}

.page-about .about-links a {
  display: grid;
  gap: 5px;
  padding: 16px 44px 16px 18px;
  position: relative;
  border: 1px solid var(--hth-line);
  border-radius: 8px;
  text-decoration: none;
  background: rgba(11, 43, 34, 0.55);
  transition: border-color 130ms ease, background 130ms ease, transform 130ms ease;
}

.page-about .about-links a::after {
  content: "→";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--hth-font-mono);
  font-size: 16px;
  color: var(--hth-accent);
  transition: right 130ms ease;
}

.page-about .about-links a:hover,
.page-about .about-links a:focus-visible {
  border-color: var(--hth-accent);
  background: rgba(85, 255, 184, 0.08);
}

.page-about .about-links a:hover::after,
.page-about .about-links a:focus-visible::after {
  right: 14px;
}

.page-about .about-links__title {
  font-family: var(--hth-font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--hth-white);
}

.page-about .about-links__desc {
  font-size: 13px;
  line-height: 1.65;
  color: var(--hth-muted);
}

/* ---------- 焦点可见 ---------- */
.page-about a:focus-visible {
  outline: 2px solid var(--hth-focus);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}