.page-about {
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: var(--s1) 0 0;
  list-style: none;
  font-size: 13px;
  color: var(--text-mute);
}
.page-about .breadcrumb li {
  display: flex;
  align-items: center;
  gap: 10px;
}
.page-about .breadcrumb li + li::before {
  content: "/";
  color: var(--line-strong);
}
.page-about .breadcrumb a {
  color: var(--text-dim);
  text-decoration: none;
  transition: color 200ms var(--ease);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--orange);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  margin-top: var(--s1);
  padding: var(--s2) 0 var(--s2);
  background:
    radial-gradient(120% 90% at 88% 6%, rgba(255, 107, 53, 0.22) 0%, rgba(255, 107, 53, 0) 58%),
    linear-gradient(158deg, var(--green) 0%, var(--green-deep) 100%);
  border-top: 1px solid rgba(192, 192, 192, 0.2);
  border-bottom: 1px solid rgba(192, 192, 192, 0.2);
  overflow: hidden;
}
.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, rgba(244, 241, 234, 0.05) 0 1px, transparent 1px 72px);
  pointer-events: none;
}
.page-about .ab-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--s2);
}
.page-about .ab-hero .eyebrow {
  display: inline-block;
  margin: 0 0 14px;
  padding: 5px 10px;
  border: 1px solid rgba(255, 107, 53, 0.6);
  color: var(--orange-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
}
.page-about .ab-hero h1 {
  margin: 0 0 18px;
  max-width: 22em;
  font-size: 30px;
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: #F4F1EA;
}
.page-about .ab-hero__text {
  margin: 0;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(244, 241, 234, 0.86);
}
.page-about .ab-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1px;
  margin: var(--s2) 0 0;
  background: rgba(244, 241, 234, 0.18);
  border: 1px solid rgba(244, 241, 234, 0.18);
}
.page-about .ab-fact {
  padding: 16px 18px;
  background: rgba(6, 61, 36, 0.72);
}
.page-about .ab-fact dt {
  margin: 0 0 6px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: rgba(244, 241, 234, 0.66);
}
.page-about .ab-fact dd {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 0;
  color: var(--orange);
}
.page-about .ab-fact .num--lg {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.01em;
}
.page-about .ab-fact__unit {
  font-size: 14px;
  font-weight: 600;
  color: var(--orange-soft);
}

/* 目录卡 */
.page-about .ab-toc {
  align-self: start;
  padding: 18px 20px 20px;
  background: rgba(17, 17, 17, 0.42);
  border: 1px solid rgba(244, 241, 234, 0.24);
  border-top: 3px solid var(--orange);
}
.page-about .ab-toc__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--orange-soft);
}
.page-about .ab-toc__list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .ab-toc__list a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 9px 10px;
  color: #F4F1EA;
  font-size: 15px;
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color 200ms var(--ease), border-color 200ms var(--ease), background 200ms var(--ease);
}
.page-about .ab-toc__list .mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(244, 241, 234, 0.5);
}
.page-about .ab-toc__list a:hover,
.page-about .ab-toc__list a:focus-visible {
  color: var(--orange);
  border-left-color: var(--orange);
  background: rgba(255, 107, 53, 0.1);
}

/* ---------- 通用 ---------- */
.page-about .section {
  padding: var(--s3) 0;
}
.page-about .ab-lede {
  margin: 14px 0 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--text-dim);
}
.page-about .ab-note {
  margin: var(--s2) 0 0;
  padding: 16px 18px;
  max-width: 52em;
  border-left: 3px solid var(--orange);
  background: var(--graphite);
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}

/* ---------- 时间线 ---------- */
.page-about .ab-timeline {
  background: var(--ink);
}
.page-about .ab-timeline__grid {
  display: grid;
  gap: var(--s2);
  margin-top: var(--s2);
}
.page-about .ab-tl__index-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--text-mute);
}
.page-about .ab-tl__index ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .ab-tl__index a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--line);
  color: var(--text-dim);
  font-size: 13px;
  text-decoration: none;
  transition: color 200ms var(--ease), border-color 200ms var(--ease), background 200ms var(--ease);
}
.page-about .ab-tl__index .mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--text-mute);
}
.page-about .ab-tl__index a:hover,
.page-about .ab-tl__index a:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
  background: rgba(255, 107, 53, 0.1);
}

.page-about .ab-tl__main {
  display: grid;
  gap: var(--s2);
  min-width: 0;
}
.page-about .ab-tl__figure {
  margin: 0;
  padding: 14px;
  background: var(--graphite);
  border: 1px solid var(--line);
  border-left: 4px solid var(--wine);
}
.page-about .ab-tl__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border: 1px solid var(--line);
}
.page-about .ab-tl__figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-mute);
}

.page-about .ab-tl__list {
  display: grid;
  gap: var(--s2);
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .ab-tl-card {
  position: relative;
  padding: var(--s1);
  background: var(--graphite);
  border: 1px solid var(--line);
  border-left: 4px solid var(--green-hi);
  box-shadow: 0 22px 44px -30px rgba(0, 0, 0, 0.95);
  transition: border-left-color 200ms var(--ease), transform 200ms var(--ease);
}
.page-about .ab-tl-card:hover {
  border-left-color: var(--orange);
  transform: translateY(-2px);
}
.page-about .ab-tl-card:nth-child(2n) {
  border-left-color: var(--wine);
}
.page-about .ab-tl-card:nth-child(3n) {
  border-left-color: var(--indigo);
}
.page-about .ab-tl-card__mark {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--silver);
}
.page-about .ab-tl-card__body h3 {
  margin: 12px 0 8px;
  font-size: 19px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--text);
}
.page-about .ab-tl-card__body p {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
}

/* ---------- 我们在做什么 ---------- */
.page-about .ab-what {
  background: var(--green-deep);
}
.page-about .ab-what__grid {
  display: grid;
  gap: 1px;
  margin-top: var(--s2);
  background: rgba(192, 192, 192, 0.2);
  border: 1px solid rgba(192, 192, 192, 0.2);
}
.page-about .ab-disc {
  background: var(--graphite);
}
.page-about .disclosure__btn {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 18px 18px;
  background: transparent;
  border: 0;
  color: var(--text);
  font-family: inherit;
  font-size: 16px;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
  transition: background 200ms var(--ease), color 200ms var(--ease);
}
.page-about .disclosure__btn:hover {
  background: rgba(255, 107, 53, 0.08);
}
.page-about .disclosure__btn:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: -3px;
}
.page-about .disclosure__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange);
}
.page-about .disclosure__icon {
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--orange);
  border-bottom: 2px solid var(--orange);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform 200ms var(--ease);
}
.page-about .disclosure[data-open] .disclosure__icon {
  transform: rotate(-135deg) translate(-2px, -2px);
}
.page-about .disclosure__panel {
  display: block;
  padding: 0 18px 20px;
}
.page-about .disclosure:not([data-open]) .disclosure__panel {
  display: none;
}
.page-about .disclosure__panel p {
  margin: 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  background: var(--ink);
}
.page-about .ab-team__grid {
  display: grid;
  gap: var(--s2);
  margin-top: var(--s2);
}
.page-about .ab-team__figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--graphite);
  padding: 12px;
}
.page-about .ab-team__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}
.page-about .ab-team__figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-mute);
}

.page-about .ab-ring {
  padding: var(--s1);
  background: var(--graphite);
  border: 1px solid var(--line);
  border-top: 3px solid var(--orange);
}
.page-about .ab-ring__title {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--orange-soft);
}
.page-about .ab-ring__wrap {
  display: grid;
  gap: var(--s2);
}
.page-about .ab-ring__chart {
  display: block;
  width: 100%;
  max-width: 220px;
  height: auto;
  margin: 0 auto;
}
.page-about .ab-ring__seg {
  transition: opacity 200ms var(--ease), stroke-width 200ms var(--ease);
  cursor: default;
}
.page-about .ab-ring__seg:hover {
  opacity: 0.72;
  stroke-width: 30;
}
.page-about .ab-ring__legend {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .ab-ring__item {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  background: var(--ink);
  border-left: 3px solid var(--silver);
  transition: background 200ms var(--ease);
}
.page-about .ab-ring__item--ops {
  border-left-color: var(--green-hi);
}
.page-about .ab-ring__item--edit {
  border-left-color: var(--orange);
}
.page-about .ab-ring__item--tech {
  border-left-color: var(--cyan);
}
.page-about .ab-ring__item:hover,
.page-about .ab-ring__item:focus-visible {
  background: #161616;
  outline: none;
}
.page-about .ab-ring__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}
.page-about .ab-ring__name .mono {
  font-family: var(--font-mono);
  color: var(--orange);
}
.page-about .ab-ring__desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-mute);
}

.page-about .ab-team__notes {
  display: grid;
  gap: var(--s2);
  margin-top: var(--s2);
}
.page-about .ab-team__note {
  padding-top: 18px;
  border-top: 2px solid var(--green-hi);
}
.page-about .ab-team__note h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 800;
  color: var(--text);
}
.page-about .ab-team__note p {
  margin: 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
}

/* ---------- 覆盖与协作 ---------- */
.page-about .ab-coverage {
  background: var(--indigo);
}
.page-about .ab-cov__grid {
  display: grid;
  gap: var(--s2);
  margin-top: var(--s2);
}
.page-about .ab-cov__stats {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .ab-cov__stat {
  padding: 18px 20px;
  background: rgba(17, 17, 17, 0.78);
}
.page-about .ab-cov__stat .num--lg {
  display: block;
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 800;
  line-height: 1;
  color: var(--orange);
  letter-spacing: 0.01em;
}
.page-about .ab-cov__label {
  display: block;
  margin: 6px 0 10px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--silver);
}
.page-about .ab-cov__stat p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--text-dim);
}
.page-about .ab-cov__figure {
  margin: 0;
  padding: 12px;
  background: rgba(17, 17, 17, 0.78);
  border: 1px solid var(--line);
}
.page-about .ab-cov__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}
.page-about .ab-cov__figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-mute);
}

.page-about .ab-cov__partners {
  margin-top: var(--s2);
  padding-top: var(--s2);
  border-top: 1px solid var(--line-strong);
}
.page-about .ab-cov__partners h3 {
  margin: 0 0 var(--s1);
  font-size: 20px;
  font-weight: 800;
  color: var(--text);
}
.page-about .ab-cov__list {
  display: grid;
  gap: var(--s1);
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .ab-cov__list li {
  padding: 16px 18px;
  background: rgba(17, 17, 17, 0.55);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
}
.page-about .ab-cov__list strong {
  display: block;
  margin: 10px 0 6px;
  font-size: 16px;
  font-weight: 800;
  color: var(--text);
}
.page-about .ab-cov__list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--text-dim);
}

/* ---------- 做事方式 ---------- */
.page-about .ab-quality {
  background: var(--ink);
}
.page-about .ab-q__grid {
  display: grid;
  gap: var(--s1);
  margin-top: var(--s2);
}
.page-about .ab-q__card {
  position: relative;
  padding: 24px 22px 26px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--silver);
  background: var(--graphite);
  transition: transform 200ms var(--ease);
}
.page-about .ab-q__card:hover {
  transform: translateY(-3px);
}
.page-about .ab-q__card--green {
  border-top-color: var(--green-hi);
}
.page-about .ab-q__card--indigo {
  border-top-color: var(--cyan);
}
.page-about .ab-q__card--wine {
  border-top-color: var(--wine);
}
.page-about .ab-q__num {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--text-mute);
}
.page-about .ab-q__card h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 800;
  color: var(--text);
}
.page-about .ab-q__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--text-dim);
}

/* ---------- 认可与资质 ---------- */
.page-about .ab-recog {
  background: var(--paper);
  color: var(--paper-ink);
}
.page-about .ab-recog .spine {
  color: var(--paper-ink);
}
.page-about .ab-recog .section__head h2 {
  color: var(--paper-ink);
}
.page-about .ab-recog .ab-lede {
  color: rgba(26, 26, 26, 0.72);
}
.page-about .ab-recog__list {
  display: grid;
  gap: 1px;
  margin: var(--s2) 0 0;
  padding: 0;
  list-style: none;
  background: rgba(26, 26, 26, 0.16);
  border: 1px solid rgba(26, 26, 26, 0.16);
}
.page-about .ab-recog__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 18px;
  align-items: start;
  padding: 22px 20px;
  background: var(--paper);
}
.page-about .ab-recog__mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border: 1px solid var(--green);
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 800;
}
.page-about .ab-recog__item h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.45;
  color: var(--paper-ink);
}
.page-about .ab-recog__item p {
  margin: 0;
  max-width: 40em;
  font-size: 14px;
  line-height: 1.76;
  color: rgba(26, 26, 26, 0.72);
}

/* ---------- 下一步 ---------- */
.page-about .ab-next {
  padding: var(--s3) 0;
  background: var(--green-deep);
}
.page-about .ab-next__title {
  margin: 0 0 var(--s2);
  font-size: 24px;
  font-weight: 900;
  color: #F4F1EA;
}
.page-about .ab-next__grid {
  display: grid;
  gap: var(--s1);
}
.page-about .ab-next__card {
  display: grid;
  gap: 8px;
  padding: 22px 20px;
  background: rgba(17, 17, 17, 0.42);
  border: 1px solid rgba(244, 241, 234, 0.22);
  border-left: 4px solid var(--orange);
  color: #F4F1EA;
  text-decoration: none;
  transition: background 200ms var(--ease), transform 200ms var(--ease);
}
.page-about .ab-next__card:hover,
.page-about .ab-next__card:focus-visible {
  background: rgba(255, 107, 53, 0.14);
  transform: translateY(-3px);
}
.page-about .ab-next__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange-soft);
}
.page-about .ab-next__card strong {
  font-size: 19px;
  font-weight: 800;
}
.page-about .ab-next__desc {
  font-size: 14px;
  line-height: 1.72;
  color: rgba(244, 241, 234, 0.8);
}

/* ---------- 平板 ---------- */
@media (min-width: 700px) {
  .page-about .ab-hero {
    padding: var(--s3) 0;
  }
  .page-about .ab-hero h1 {
    font-size: 40px;
  }
  .page-about .ab-what__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-team__notes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-q__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-cov__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-next__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-ring__wrap {
    grid-template-columns: 200px minmax(0, 1fr);
    align-items: start;
    gap: var(--s1);
  }
  .page-about .ab-ring__chart {
    margin: 0;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: var(--s3);
    align-items: start;
  }
  .page-about .ab-hero h1 {
    font-size: 48px;
  }
  .page-about .ab-timeline__grid {
    grid-template-columns: 172px minmax(0, 1fr);
    gap: var(--s3);
  }
  .page-about .ab-tl__index {
    position: sticky;
    top: calc(var(--toprail-h) + 28px);
    align-self: start;
    border-left: 1px solid var(--line);
    padding-left: 16px;
  }
  .page-about .ab-tl__index ol {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }
  .page-about .ab-tl__index a {
    border: 0;
    border-left: 2px solid transparent;
    padding: 9px 10px;
  }
  .page-about .ab-tl__main {
    grid-template-columns: minmax(0, 1fr);
  }
  .page-about .ab-tl__figure {
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr);
    gap: var(--s1);
    align-items: center;
  }
  .page-about .ab-tl__figure figcaption {
    margin-top: 0;
  }
  .page-about .ab-tl-card:nth-child(2n) {
    margin-left: var(--s2);
  }
  .page-about .ab-tl-card:nth-child(3n) {
    margin-left: var(--s2);
  }
  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: var(--s2);
  }
  .page-about .ab-cov__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: var(--s2);
  }
  .page-about .ab-q__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .ab-recog__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-recog__item {
    grid-template-columns: auto 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-tl-card,
  .page-about .ab-q__card,
  .page-about .ab-next__card,
  .page-about .disclosure__icon {
    transition: none;
  }
  .page-about .ab-tl-card:hover,
  .page-about .ab-q__card:hover,
  .page-about .ab-next__card:hover {
    transform: none;
  }
}
</main>