/* ==========================================================
   page: 品牌与团队 /who-we-are/
   作用域：.page-about
   ========================================================== */

.page-about {
  --about-rail: 236px;
  display: block;
  background-color: var(--ink-900);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 32px 32px;
  color: var(--sand-50);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 128px 0 64px;
}

.page-about .about-hero .crumbs {
  margin-bottom: 34px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 34px;
  align-items: start;
}

.page-about .about-hero__lede .label {
  margin: 0 0 14px;
}

.page-about .about-hero__lede h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 32px;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--sand-50);
}

.page-about .about-hero__lede .lead {
  margin: 18px 0 30px;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.85;
  color: rgba(242, 245, 241, .86);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 16px;
  border-top: 1px solid var(--line-700);
  padding-top: 24px;
}

.page-about .about-hero__stats .stat {
  display: block;
}

.page-about .about-hero__stats .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--sand-50);
}

.page-about .about-hero__stats .stat__num--cyan {
  color: var(--signal-cyan);
}

.page-about .about-hero__stats .stat__num--orange {
  color: var(--alert-orange);
}

.page-about .about-hero__stats .stat__cap {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--slate-400);
}

.page-about .about-hero__media {
  margin: 0;
  border-radius: var(--r-media);
  overflow: hidden;
  border: 1px solid var(--line-700);
}

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

.page-about .about-hero__media .media__cap {
  display: block;
  padding: 12px 16px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate-400);
  background: var(--ink-800);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  padding: 24px 0 96px;
}

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

/* ---------- 左侧章节轨道 ---------- */
.page-about .about-rail {
  margin: 0 0 44px;
}

.page-about .about-rail__cap {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--slate-400);
}

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

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 15px;
  border: 1px solid var(--line-700);
  border-radius: var(--r-pill);
  color: var(--sand-50);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}

.page-about .about-rail__no {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--signal-cyan);
}

.page-about .about-rail__txt {
  font-size: 14px;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--signal-cyan);
  background-color: rgba(12, 107, 90, .32);
}

/* ---------- 正文流 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 78px;
}

.page-about .about-sec {
  scroll-margin-top: 108px;
}

.page-about .about-sec__head {
  margin: 0 0 18px;
}

.page-about .about-sec__head .label {
  margin: 0;
}

.page-about .about-sec__head h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: 26px;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--sand-50);
}

.page-about .about-sec__body {
  margin: 0 0 18px;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.85;
  color: rgba(242, 245, 241, .84);
}

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

.page-about .about-sec__media {
  margin: 28px 0 28px;
  border-radius: var(--r-media);
  overflow: hidden;
  border: 1px solid var(--line-700);
}

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

.page-about .about-sec__media .media__cap {
  display: block;
  padding: 12px 16px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate-400);
  background: var(--ink-800);
}

/* ---------- 01 三段步骤 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 28px 0 0;
  padding: 0 0 0 26px;
  position: relative;
  display: grid;
  gap: 18px;
}

.page-about .about-steps::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 16px;
  bottom: 16px;
  width: 1px;
  background: linear-gradient(180deg, var(--teal-600), var(--signal-cyan) 55%, var(--alert-orange));
}

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

.page-about .about-steps__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 26px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--signal-cyan);
  box-shadow: 0 0 0 4px rgba(53, 240, 200, .14);
}

.page-about .about-steps__item:nth-child(2)::before {
  background: var(--cyan-100);
  box-shadow: 0 0 0 4px rgba(159, 252, 230, .14);
}

.page-about .about-steps__item:nth-child(3)::before {
  background: var(--alert-orange);
  box-shadow: 0 0 0 4px rgba(255, 122, 47, .16);
}

.page-about .about-steps__card {
  padding: 22px 22px 24px;
  background: var(--ink-800);
  border: 1px solid var(--line-700);
  border-radius: var(--r-sub);
  transition: border-color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}

.page-about .about-steps__card:hover {
  border-color: var(--signal-cyan);
  transform: translateY(-4px);
}

.page-about .about-steps__card .tag {
  display: inline-block;
}

.page-about .about-steps__card h3 {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--sand-50);
}

.page-about .about-steps__card p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(242, 245, 241, .8);
}

/* ---------- 02 团队分工 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .about-roles__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "name num"
    "bar bar"
    "desc desc";
  gap: 8px 14px;
  align-items: center;
}

.page-about .about-roles__name {
  grid-area: name;
  font-size: 17px;
  font-weight: 600;
  color: var(--sand-50);
}

.page-about .about-roles__num {
  grid-area: num;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--signal-cyan);
}

.page-about .about-roles__bar {
  grid-area: bar;
  display: block;
  height: 10px;
  border-radius: var(--r-pill);
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .about-roles__fill {
  display: block;
  height: 100%;
  border-radius: var(--r-pill);
  background: linear-gradient(90deg, var(--teal-600), var(--signal-cyan));
  transition: filter var(--t-fast) var(--ease);
}

.page-about .about-roles__row:nth-child(1) .about-roles__fill {
  width: 56%;
}

.page-about .about-roles__row:nth-child(2) .about-roles__fill {
  width: 25%;
  background: linear-gradient(90deg, var(--teal-600), var(--amber-400));
}

.page-about .about-roles__row:nth-child(3) .about-roles__fill {
  width: 19%;
  background: linear-gradient(90deg, var(--teal-600), var(--alert-orange));
}

.page-about .about-roles__row:hover .about-roles__fill {
  filter: brightness(1.15) saturate(1.1);
}

.page-about .about-roles__desc {
  grid-area: desc;
  margin: 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--slate-400);
}

/* ---------- 04 改版刻度尺 ---------- */
.page-about .about-versions {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 26px;
}

.page-about .about-versions__item {
  position: relative;
  padding-left: 50px;
}

.page-about .about-versions__mark {
  position: absolute;
  left: 0;
  top: 0;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--ink-800);
  border: 1px solid var(--line-700);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--signal-cyan);
}

.page-about .about-versions__item--now .about-versions__mark {
  border-color: var(--alert-orange);
  color: var(--alert-orange);
  box-shadow: 0 0 0 4px rgba(255, 122, 47, .14);
}

.page-about .about-versions__item h3 {
  margin: 2px 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--sand-50);
}

.page-about .about-versions__item p {
  margin: 0;
  max-width: 32em;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(242, 245, 241, .8);
}

/* ---------- 05 术语表 ---------- */
.page-about .about-terms {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-terms__item {
  padding: 18px 20px 18px 22px;
  background: var(--ink-800);
  border-left: 3px solid var(--teal-600);
  border-radius: var(--r-sub);
  transition: border-color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}

.page-about .about-terms__item:hover {
  border-left-color: var(--signal-cyan);
  transform: translateY(-3px);
}

.page-about .about-terms__head {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--signal-cyan);
}

.page-about .about-terms__body {
  display: block;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(242, 245, 241, .82);
}

/* ---------- 06 数据节奏 ---------- */
.page-about .about-sources {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-700);
}

.page-about .about-sources__item {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding: 18px 6px;
  border-bottom: 1px solid var(--line-700);
  transition: background-color var(--t-fast) var(--ease);
}

.page-about .about-sources__item:hover {
  background-color: rgba(12, 107, 90, .2);
}

.page-about .about-sources__k {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--signal-cyan);
}

.page-about .about-sources__v {
  font-size: 16px;
  line-height: 1.75;
  color: rgba(242, 245, 241, .82);
}

/* ---------- 下一步入口 ---------- */
.page-about .about-next-sec {
  padding-top: 12px;
  border-top: 1px solid var(--line-700);
}

.page-about .about-next-sec__title {
  margin: 32px 0 20px;
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: -0.01em;
  color: var(--sand-50);
}

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

.page-about .about-next__card {
  display: block;
  padding: 24px 24px 26px;
  background: var(--ink-800);
  border: 1px solid var(--line-700);
  border-radius: var(--r-card);
  text-decoration: none;
  color: inherit;
  transition: border-color var(--t-fast) var(--ease),
              transform var(--t-fast) var(--ease),
              background-color var(--t-fast) var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  border-color: var(--signal-cyan);
  background-color: var(--ink-900);
  transform: translateY(-4px);
}

.page-about .about-next__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: -0.01em;
  color: var(--sand-50);
}

.page-about .about-next__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--slate-400);
}

.page-about .about-next__go {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--signal-cyan);
}

/* ==========================================================
   响应式
   ========================================================== */

@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px 24px;
  }

  .page-about .about-hero__stats .stat__num {
    font-size: 36px;
  }

  .page-about .about-terms {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

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

@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 140px 0 72px;
  }

  .page-about .about-hero__lede h1 {
    font-size: 44px;
  }

  .page-about .about-sec__head h2 {
    font-size: 30px;
  }

  .page-about .about-sec__media {
    margin: 32px 0 32px;
  }

  .page-about .about-roles__row {
    grid-template-columns: 132px minmax(0, 1fr) 64px;
    grid-template-areas:
      "name bar num"
      "desc desc desc";
    gap: 10px 18px;
  }

  .page-about .about-roles__num {
    text-align: right;
  }

  .page-about .about-sources__item {
    grid-template-columns: 112px minmax(0, 1fr);
    gap: 24px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero {
    padding: 152px 0 84px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: 64px;
    align-items: center;
  }

  .page-about .about-hero__lede h1 {
    font-size: 50px;
  }

  .page-about .about-body {
    padding: 16px 0 120px;
  }

  .page-about .about-body__grid {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 72px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 108px;
    align-self: start;
    margin-bottom: 0;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    position: relative;
  }

  .page-about .about-rail__list::before {
    content: "";
    position: absolute;
    left: 5px;
    top: 22px;
    bottom: 22px;
    width: 1px;
    background: var(--line-700);
  }

  .page-about .about-rail__item {
    position: relative;
    padding-left: 26px;
  }

  .page-about .about-rail__item::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 11px;
    height: 11px;
    margin-top: -6px;
    border-radius: 50%;
    background: var(--ink-900);
    border: 2px solid var(--teal-600);
    transition: border-color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
  }

  .page-about .about-rail__item:hover::before {
    border-color: var(--alert-orange);
    background-color: var(--alert-orange);
  }

  .page-about .about-rail__link {
    display: flex;
    align-items: baseline;
    width: 100%;
    padding: 12px 14px;
    border-color: transparent;
    border-radius: var(--r-pill);
  }

  .page-about .about-flow {
    gap: 96px;
  }

  .page-about .about-next-sec__title {
    font-size: 24px;
  }
}

@media (min-width: 900px) {
  .page-about .about-versions {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 32px;
    position: relative;
    padding-top: 6px;
  }

  .page-about .about-versions::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 23px;
    height: 1px;
    background: var(--line-700);
  }

  .page-about .about-versions__item {
    padding-left: 0;
    padding-top: 52px;
  }

  .page-about .about-versions__mark {
    left: 0;
    top: 6px;
    width: 34px;
    height: 34px;
    background: var(--ink-900);
    z-index: 1;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__lede h1 {
    font-size: 56px;
  }

  .page-about .about-sec__head h2 {
    font-size: 32px;
  }

  .page-about .about-sources__k {
    font-size: 24px;
  }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-steps__card,
  .page-about .about-terms__item,
  .page-about .about-next__card,
  .page-about .about-roles__fill,
  .page-about .about-rail__link,
  .page-about .about-rail__item::before,
  .page-about .about-sources__item {
    transition: none;
  }

  .page-about .about-steps__card:hover,
  .page-about .about-terms__item:hover,
  .page-about .about-next__card:hover,
  .page-about .about-next__card:focus-visible {
    transform: none;
  }
}
<<<END>>>