.page-about {
  --about-line: rgba(18, 16, 15, 0.13);
  --about-line-soft: rgba(18, 16, 15, 0.09);
  --about-line-dark: rgba(255, 255, 255, 0.16);
  --about-body: #4a443d;
  --about-body-soft: #5d564d;
  --about-gold-text: #a8791a;
  display: block;
  overflow-x: hidden;
}

/* ---------- 公共分节标题 ---------- */
.page-about .about-sec-head {
  max-width: 46rem;
  margin: 0 0 40px;
}
.page-about .about-sec-head .index-tag {
  display: block;
  margin-bottom: 16px;
  color: var(--red);
}
.page-about .about-sec-head__title {
  margin: 0 0 18px;
  letter-spacing: -0.02em;
  font-weight: 250;
  line-height: 1.12;
}
.page-about .about-sec-head__lead {
  margin: 0;
  font-size: 17px;
  line-height: 1.85;
  color: var(--about-body);
}
.page-about .about-sec-head--dark .index-tag {
  color: var(--gold);
}
.page-about .about-sec-head--dark .about-sec-head__title {
  color: var(--white);
}
.page-about .about-sec-head--dark .about-sec-head__lead {
  color: rgba(255, 255, 255, 0.72);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 22px 0 60px;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -120px;
  right: -140px;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(226, 58, 46, 0.14), rgba(226, 58, 46, 0) 68%);
  pointer-events: none;
}
.page-about .about-hero .wrap {
  position: relative;
  z-index: 1;
}
.page-about .about-hero .crumbs {
  margin-bottom: 30px;
  font-size: 13px;
  letter-spacing: 0.06em;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--rose);
}
.page-about .about-hero .crumbs a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--about-line);
}
.page-about .about-hero .crumbs a:hover {
  border-bottom-color: var(--red);
}
.page-about .about-hero__grid {
  display: grid;
  gap: 36px;
}
.page-about .about-hero__text {
  min-width: 0;
}
.page-about .about-hero__title {
  margin: 18px 0 24px;
  font-weight: 250;
  line-height: 1.06;
  letter-spacing: -0.035em;
}
.page-about .about-hero__lede {
  max-width: 33em;
  margin: 0 0 26px;
  font-size: 17px;
  line-height: 1.9;
  color: var(--about-body);
}
.page-about .about-hero__meta {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--rose);
}
.page-about .about-hero__meta li {
  position: relative;
  padding-right: 20px;
}
.page-about .about-hero__meta li:not(:last-child)::after {
  content: "";
  position: absolute;
  right: 0;
  top: 50%;
  width: 6px;
  height: 1px;
  background: var(--about-line);
}
.page-about .about-hero__fig {
  margin: 0;
}
.page-about .about-hero__fig .frame__cap {
  margin-top: 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--rose);
}

/* ---------- 三条内容线 ---------- */
.page-about .about-lines {
  padding: 68px 0;
}
.page-about .line-trio {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--about-line);
}
.page-about .line-card {
  padding: 32px 0 34px;
  border-bottom: 1px solid var(--about-line);
}
.page-about .line-card__bar {
  display: block;
  width: 46px;
  height: 4px;
  border-radius: var(--r-pill);
  margin-bottom: 24px;
}
.page-about .line-card--red .line-card__bar { background: var(--red); }
.page-about .line-card--gold .line-card__bar { background: var(--gold); }
.page-about .line-card--cyan .line-card__bar { background: var(--cyan); }

.page-about .line-card__figure {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}
.page-about .line-card__num {
  font-family: var(--font-num);
  font-size: 46px;
  line-height: 1;
  font-weight: 500;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}
.page-about .line-card--red .line-card__num { color: var(--red); }
.page-about .line-card--gold .line-card__num { color: var(--about-gold-text); }
.page-about .line-card--cyan .line-card__num { color: var(--cyan); }
.page-about .line-card__unit {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--rose);
}
.page-about .line-card__title {
  margin: 0 0 12px;
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.page-about .line-card__body {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-body);
  max-width: 34em;
}
.page-about .line-card__list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
}
.page-about .line-card__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.95;
  color: var(--about-body-soft);
}
.page-about .line-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.82em;
  width: 8px;
  height: 1px;
  background: var(--rose);
}

/* ---------- 展开控件 ---------- */
.page-about .about-disclose {
  appearance: none;
  border: 1px solid rgba(18, 16, 15, 0.24);
  background: transparent;
  border-radius: var(--r-pill);
  padding: 8px 20px;
  font: inherit;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--ink);
  cursor: pointer;
  transition: background 200ms var(--ease), color 200ms var(--ease), border-color 200ms var(--ease);
}
.page-about .about-disclose:hover {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--cream);
}
.page-about .about-disclose[aria-expanded="true"] {
  background: var(--red);
  border-color: var(--red);
  color: var(--white);
}
.page-about .about-disclose:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}
.page-about .about-disclose__panel {
  margin-top: 16px;
  padding: 16px 18px;
  border-left: 3px solid var(--gold);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: rgba(255, 255, 255, 0.66);
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-body);
}
.page-about .about-disclose__panel p {
  margin: 0;
}

/* ---------- 通栏图 ---------- */
.page-about .about-venue {
  padding: 0 0 68px;
}
.page-about .about-venue__fig {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
}
.page-about .about-venue__fig .frame__cap {
  margin-top: 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--rose);
}

/* ---------- 开运板块 ---------- */
.page-about .about-kaiyun {
  position: relative;
  padding: 76px 0 80px;
  overflow: hidden;
}
.page-about .about-kaiyun::before {
  content: "";
  position: absolute;
  left: -14%;
  bottom: -40%;
  width: 66%;
  height: 130%;
  background: radial-gradient(ellipse at 32% 68%, rgba(226, 58, 46, 0.26), rgba(226, 58, 46, 0) 64%);
  pointer-events: none;
}
.page-about .about-kaiyun .wrap {
  position: relative;
  z-index: 1;
}
.page-about .sector-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-line-dark);
}
.page-about .sector-item {
  border-bottom: 1px solid var(--about-line-dark);
}
.page-about .sector-item__btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 0;
  background: transparent;
  border: 0;
  font: inherit;
  color: var(--white);
  text-align: left;
  cursor: pointer;
  transition: padding-left 220ms var(--ease), color 220ms var(--ease);
}
.page-about .sector-item__btn:hover {
  padding-left: 10px;
  color: var(--gold);
}
.page-about .sector-item__btn:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 4px;
}
.page-about .sector-item__idx {
  flex: none;
  width: 30px;
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--gold);
}
.page-about .sector-item__name {
  flex: 1;
  font-size: 19px;
  font-weight: 500;
  letter-spacing: 0.01em;
}
.page-about .sector-item__mark {
  position: relative;
  flex: none;
  width: 22px;
  height: 22px;
}
.page-about .sector-item__mark::before,
.page-about .sector-item__mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--gold);
  transform: translate(-50%, -50%);
  transition: transform 220ms var(--ease), opacity 220ms var(--ease);
}
.page-about .sector-item__mark::before {
  width: 14px;
  height: 1.5px;
}
.page-about .sector-item__mark::after {
  width: 1.5px;
  height: 14px;
}
.page-about .sector-item__btn[aria-expanded="true"] .sector-item__mark::after {
  transform: translate(-50%, -50%) scaleY(0);
  opacity: 0;
}
.page-about .sector-item__panel {
  padding: 0 0 24px 46px;
}
.page-about .sector-item__panel p {
  margin: 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.74);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: 76px 0;
}
.page-about .about-team__grid {
  display: grid;
  gap: 36px;
}
.page-about .about-team__fig {
  margin: 0;
  aspect-ratio: 3 / 2;
}
.page-about .about-team__fig .frame__cap {
  margin-top: 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--rose);
}
.page-about .about-team__title {
  margin: 16px 0 18px;
  font-weight: 250;
  letter-spacing: -0.02em;
}
.page-about .about-team__lead {
  margin: 0 0 32px;
  max-width: 38em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--about-body);
}
.page-about .team-roster {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .team-roster__item {
  padding: 20px 0;
  border-top: 1px solid var(--about-line);
}
.page-about .team-roster__item:last-child {
  border-bottom: 1px solid var(--about-line);
}
.page-about .team-roster__name {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}
.page-about .team-roster__tag {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--red);
}
.page-about .team-roster__desc {
  margin: 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-body);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  padding: 76px 0 80px;
}
.page-about .tl-scroll {
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  margin: 0 -20px;
  padding: 0 20px 20px;
}
.page-about .tl-scroll:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 4px;
}
.page-about .tl-track {
  position: relative;
  list-style: none;
  display: flex;
  margin: 0;
  padding: 0;
  min-width: 920px;
}
.page-about .tl-track::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 17px;
  height: 1px;
  background: linear-gradient(90deg, var(--red) 0%, var(--gold) 50%, var(--cyan) 100%);
  opacity: 0.6;
}
.page-about .tl-node {
  position: relative;
  flex: 1 0 170px;
  max-width: 220px;
  padding-right: 28px;
}
.page-about .tl-node__dot {
  display: block;
  position: relative;
  z-index: 1;
  width: 12px;
  height: 12px;
  margin: 11px 0 22px;
  border-radius: 50%;
  border: 2px solid var(--gold);
  background: var(--ink-2);
}
.page-about .tl-node:first-child .tl-node__dot {
  border-color: var(--red);
  background: var(--red);
}
.page-about .tl-node__idx {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
}
.page-about .tl-node__title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 600;
  color: var(--white);
  letter-spacing: -0.01em;
}
.page-about .tl-node__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.68);
}

/* ---------- 收尾 ---------- */
.page-about .about-closing {
  padding: 76px 0 88px;
}
.page-about .about-closing__grid {
  display: grid;
  gap: 40px;
}
.page-about .about-closing__title {
  margin: 16px 0 18px;
  font-weight: 250;
  letter-spacing: -0.02em;
}
.page-about .about-closing__lead {
  margin: 0 0 30px;
  max-width: 40em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--about-body);
}
.page-about .principles {
  list-style: none;
  margin: 0 0 34px;
  padding: 0;
  border-top: 1px solid var(--about-line);
}
.page-about .principles li {
  position: relative;
  padding: 16px 0 16px 32px;
  border-bottom: 1px solid var(--about-line-soft);
  font-size: 16px;
  line-height: 1.8;
  color: #3d3831;
}
.page-about .principles li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.65em;
  width: 16px;
  height: 2px;
  border-radius: var(--r-pill);
  background: var(--red);
}
.page-about .about-closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-aside {
  padding: 26px 24px 28px;
  border-radius: var(--r-md);
  border-left: 3px solid var(--red);
  background: var(--cream);
}
.page-about .about-aside__text {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-body);
}
.page-about .about-aside__link {
  display: block;
  padding: 12px 0;
  border-top: 1px solid var(--about-line-soft);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  transition: color 180ms var(--ease), padding-left 180ms var(--ease);
}
.page-about .about-aside__link:hover {
  color: var(--red);
  padding-left: 6px;
}
.page-about .about-aside__link:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 28px 0 76px;
  }
  .page-about .line-card {
    padding: 34px 0 38px;
  }
  .page-about .about-venue {
    padding: 0 0 84px;
  }
  .page-about .about-lines,
  .page-about .about-team,
  .page-about .about-timeline,
  .page-about .about-closing {
    padding-top: 92px;
    padding-bottom: 96px;
  }
  .page-about .about-kaiyun {
    padding: 92px 0 96px;
  }
  .page-about .tl-scroll {
    margin: 0;
    padding-left: 0;
    padding-right: 0;
  }
}

@media (min-width: 880px) {
  .page-about .line-trio {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 44px;
    border-top: 0;
  }
  .page-about .line-card {
    padding: 30px 0 6px;
    border-bottom: 0;
    border-top: 1px solid var(--about-line);
  }
  .page-about .about-closing__grid {
    grid-template-columns: minmax(0, 1fr) 262px;
    gap: 64px;
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) 336px;
    gap: 60px;
    align-items: center;
  }
  .page-about .about-team__grid {
    grid-template-columns: 388px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }
  .page-about .about-team__fig {
    position: sticky;
    top: 88px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-sec-head {
    margin-bottom: 52px;
  }
  .page-about .about-hero__title {
    letter-spacing: -0.04em;
  }
  .page-about .line-card__num {
    font-size: 52px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-disclose,
  .page-about .sector-item__btn,
  .page-about .sector-item__mark::before,
  .page-about .sector-item__mark::after,
  .page-about .about-aside__link {
    transition: none;
  }
  .page-about .about-team__fig {
    position: static;
  }
}