/* ==================== 品牌与团队 / page-about ==================== */

.page-about {
  --about-line: var(--hb-line);
  --about-panel: var(--hb-panel);
  --about-gutter: 24px;
  position: relative;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  margin: 0 0 6px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 20px 0 60px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: 0;
  top: -220px;
  left: -140px;
  width: 640px;
  height: 540px;
  background: radial-gradient(circle at 34% 34%, rgba(255, 78, 43, 0.24), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: 0;
  right: -180px;
  bottom: -180px;
  width: 660px;
  height: 500px;
  background: radial-gradient(circle at 66% 66%, rgba(47, 210, 228, 0.18), transparent 64%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 36px;
}

.page-about .about-hero__copy {
  max-width: 46ch;
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-size: clamp(32px, 6vw, 68px);
  line-height: 1.06;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--hb-cream);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--hb-muted);
  max-width: 60ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .about-stat {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 18px 18px 20px;
  border: 1px solid var(--about-line);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(22, 30, 36, 0.95), rgba(11, 16, 20, 0.7));
  overflow: hidden;
}

.page-about .about-stat::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--hb-clay);
}

.page-about .about-stat:nth-child(1)::before { background: var(--hb-flare); }
.page-about .about-stat:nth-child(2)::before { background: var(--hb-amber); }
.page-about .about-stat:nth-child(3)::before { background: var(--hb-cyan); }
.page-about .about-stat:nth-child(4)::before { background: var(--hb-moss); }

.page-about .about-stat__num {
  font-size: clamp(28px, 4.4vw, 40px);
  line-height: 1;
  font-weight: 700;
  color: var(--hb-cream);
  letter-spacing: -0.01em;
}

.page-about .about-stat__lbl {
  font-size: 12px;
  line-height: 1.5;
  color: var(--hb-dim);
}

/* ---------- 正文双栏（目录 + 主体） ---------- */
.page-about .about-body {
  display: grid;
  gap: 32px;
  padding-bottom: 40px;
}

.page-about .about-toc {
  display: none;
}

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

/* ---------- 通用区块 ---------- */
.page-about .about-block {
  padding: 48px 0 56px;
  border-top: 1px solid var(--about-line);
}

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

.page-about .about-block__head {
  max-width: 66ch;
}

.page-about .about-block__head h2 {
  margin: 14px 0 0;
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: -0.015em;
  color: var(--hb-cream);
}

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

/* ---------- 时间轴 ---------- */
.page-about .about-timeline__fig {
  margin: 32px 0 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--about-line);
}

.page-about .about-timeline__list {
  position: relative;
  list-style: none;
  margin: 40px 0 0;
  padding: 0 0 0 36px;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(
    180deg,
    rgba(255, 78, 43, 0.85) 0%,
    rgba(168, 84, 60, 0.7) 34%,
    rgba(94, 125, 99, 0.7) 68%,
    rgba(47, 210, 228, 0.6) 100%
  );
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 38px;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -36px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--hb-arena);
  border: 3px solid var(--hb-clay);
  box-sizing: border-box;
  transition: transform var(--t), border-color var(--t), box-shadow var(--t);
}

.page-about .about-timeline__item:last-child::before {
  border-color: var(--hb-flare);
  box-shadow: 0 0 0 4px rgba(255, 78, 43, 0.16);
}

.page-about .about-timeline__item:hover::before {
  transform: scale(1.25);
  border-color: var(--hb-cyan);
}

.page-about .about-timeline__year {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--hb-amber);
}

.page-about .about-timeline__title {
  margin: 8px 0 0;
  font-size: 20px;
  line-height: 1.3;
  font-weight: 800;
  color: var(--hb-cream);
}

.page-about .about-timeline__desc {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--hb-muted);
  max-width: 62ch;
}

/* ---------- 团队 ---------- */
.page-about .about-team__fig {
  margin: 32px 0 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--about-line);
}

.page-about .about-team__roles {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-team__role {
  position: relative;
  display: flex;
  gap: 18px;
  padding: 22px 20px;
  border-radius: var(--r-lg);
  border: 1px solid var(--about-line);
  background: var(--about-panel);
  transition: transform var(--t), border-color var(--t);
}

.page-about .about-team__role:hover {
  transform: translateX(8px);
  border-color: rgba(255, 78, 43, 0.45);
}

.page-about .about-team__idx {
  flex: 0 0 auto;
  font-size: 26px;
  line-height: 1;
  font-weight: 700;
  color: var(--hb-clay);
  opacity: 0.85;
}

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

.page-about .about-team__name {
  margin: 0;
  font-size: 17px;
  font-weight: 800;
  color: var(--hb-cream);
  letter-spacing: 0.01em;
}

.page-about .about-team__name .mono {
  color: var(--hb-amber);
}

.page-about .about-team__body p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--hb-muted);
  max-width: 62ch;
}

/* ---------- 三段流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-flow__step {
  position: relative;
  padding: 24px 22px 26px;
  border-radius: var(--r-lg);
  border: 1px solid var(--about-line);
  background:
    linear-gradient(140deg, rgba(47, 210, 228, 0.07), transparent 58%),
    var(--about-panel);
  overflow: hidden;
}

.page-about .about-flow__step::after {
  content: "";
  position: absolute;
  right: -40px;
  top: -40px;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: rgba(255, 78, 43, 0.07);
}

.page-about .about-flow__step:nth-child(2)::after { background: rgba(47, 210, 228, 0.08); }
.page-about .about-flow__step:nth-child(3)::after { background: rgba(94, 125, 99, 0.1); }

.page-about .about-flow__no {
  display: block;
  font-size: 34px;
  line-height: 1;
  font-weight: 700;
  color: var(--hb-flare);
  opacity: 0.85;
}

.page-about .about-flow__step:nth-child(2) .about-flow__no { color: var(--hb-cyan); }
.page-about .about-flow__step:nth-child(3) .about-flow__no { color: var(--hb-moss); }

.page-about .about-flow__title {
  margin: 14px 0 0;
  font-size: 18px;
  font-weight: 800;
  color: var(--hb-cream);
}

.page-about .about-flow__step p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--hb-muted);
  max-width: 56ch;
}

/* ---------- 术语体系 ---------- */
.page-about .about-terms {
  display: grid;
  gap: 30px;
}

.page-about .about-terms__copy h2 {
  margin: 14px 0 0;
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: -0.015em;
  color: var(--hb-cream);
}

.page-about .about-terms__copy > p {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--hb-muted);
  max-width: 60ch;
}

.page-about .about-terms__list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-terms__list li {
  padding: 16px 18px;
  border-radius: var(--r-md);
  border: 1px solid var(--about-line);
  background: rgba(22, 30, 36, 0.62);
}

.page-about .about-terms__list p {
  margin: 9px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--hb-muted);
}

.page-about .about-terms__fig {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--about-line);
  align-self: start;
}

/* ---------- 使用场景 ---------- */
.page-about .about-users {
  display: grid;
  gap: 18px;
  margin-top: 34px;
}

.page-about .about-user {
  position: relative;
  padding: 26px 24px;
  border-radius: var(--r-lg);
  border: 1px solid var(--about-line);
  background: var(--about-panel);
  overflow: hidden;
}

.page-about .about-user::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--hb-flare);
}

.page-about .about-user:nth-child(2)::before { background: var(--hb-cyan); }
.page-about .about-user:nth-child(3)::before { background: var(--hb-moss); }

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

.page-about .about-user__num {
  font-size: 30px;
  line-height: 1;
  font-weight: 700;
  color: var(--hb-cream);
}

.page-about .about-user__title {
  margin: 14px 0 0;
  font-size: 18px;
  font-weight: 800;
  color: var(--hb-cream);
}

.page-about .about-user p:not(.about-user__meta) {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--hb-muted);
  max-width: 60ch;
}

.page-about .about-user a {
  color: var(--hb-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 210, 228, 0.4);
  transition: border-color var(--t), color var(--t);
}

.page-about .about-user a:hover {
  color: var(--hb-amber);
  border-bottom-color: var(--hb-amber);
}

/* ---------- 合作与加入 ---------- */
.page-about .about-coop {
  border-top: 1px solid var(--about-line);
}

.page-about .about-coop__inner {
  display: grid;
  gap: 28px;
  padding: 32px 26px;
  border-radius: var(--r-lg);
  border: 1px solid var(--about-line);
  background:
    linear-gradient(120deg, rgba(255, 78, 43, 0.12), transparent 52%),
    linear-gradient(300deg, rgba(47, 210, 228, 0.1), transparent 50%),
    var(--about-panel);
}

.page-about .about-coop__copy h2 {
  margin: 14px 0 0;
  font-size: clamp(24px, 3.6vw, 36px);
  line-height: 1.16;
  font-weight: 900;
  letter-spacing: -0.015em;
  color: var(--hb-cream);
}

.page-about .about-coop__copy p {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--hb-muted);
  max-width: 60ch;
}

.page-about .about-coop__side {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  padding-top: 6px;
}

.page-about .about-coop__label {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--hb-dim);
}

.page-about .about-coop__mail {
  margin: 0;
  font-size: 16px;
  color: var(--hb-cream);
  word-break: break-all;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 28px 0 76px;
  }

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

  .page-about .about-timeline__list {
    padding-left: 44px;
  }

  .page-about .about-timeline__item::before {
    left: -44px;
  }

  .page-about .about-timeline__list::before {
    left: 7px;
  }

  .page-about .about-team__fig,
  .page-about .about-timeline__fig {
    border-radius: var(--r-lg);
  }

  .page-about .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

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

  .page-about .about-terms {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-terms__fig {
    margin-top: 34px;
  }

  .page-about .about-coop__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 40px;
    padding: 40px 36px;
  }

  .page-about .about-coop__side {
    align-items: flex-end;
    text-align: right;
    padding-top: 26px;
  }
}

/* ---------- 桌面端：侧边跟随目录 ---------- */
@media (min-width: 1080px) {
  .page-about .about-body {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: 60px;
  }

  .page-about .about-toc {
    display: block;
    position: sticky;
    top: 128px;
    align-self: start;
  }

  .page-about .about-toc__head {
    margin: 0 0 14px;
    font-size: 11px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--hb-dim);
  }

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

  .page-about .about-toc__list a {
    position: relative;
    display: block;
    padding: 9px 0 9px 14px;
    font-size: 13px;
    line-height: 1.4;
    color: var(--hb-dim);
    text-decoration: none;
    border-left: 1px solid var(--about-line);
    transition: color var(--t), border-color var(--t), padding-left var(--t);
  }

  .page-about .about-toc__list a:hover {
    color: var(--hb-cream);
    border-left-color: var(--hb-clay);
  }

  .page-about .about-toc__list a[aria-current="true"] {
    color: var(--hb-flare);
    border-left-color: var(--hb-flare);
    padding-left: 16px;
  }

  .page-about .about-block {
    padding: 56px 0 64px;
  }
}

/* ---------- 大屏：首屏非对称加强 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 52px;
    align-items: end;
  }

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

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__role:hover {
    transform: none;
  }

  .page-about .about-timeline__item:hover::before {
    transform: none;
  }
}