.page-about {
  --about-pad: 20px;
  --about-shell: 1180px;
  display: block;
  background: var(--cs-ivory);
  color: var(--cs-ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  overflow-x: clip;
}

.page-about .breadcrumb {
  max-width: var(--about-shell);
  margin: 0 auto;
  padding: 16px var(--about-pad) 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cs-mist);
}

.page-about .breadcrumb a {
  color: var(--cs-dark-red);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 160ms ease, color 160ms ease;
}

.page-about .breadcrumb a:hover {
  color: var(--cs-red);
  border-bottom-color: var(--cs-red);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  margin-top: 14px;
  padding: 44px 0 44px;
  background: linear-gradient(155deg, var(--cs-purple-deep) 0%, var(--cs-purple) 48%, var(--cs-green) 100%);
  color: var(--cs-ivory);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(90deg, var(--line-gold) 1px, transparent 1px);
  background-size: 58px 100%;
  opacity: 0.4;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -120px;
  top: -140px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(200, 16, 46, 0.42) 0%, rgba(42, 10, 58, 0) 68%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--about-shell);
  margin: 0 auto;
  padding: 0 var(--about-pad);
}

.page-about .about-hero .eyebrow {
  margin: 0 0 14px;
  color: var(--cs-gold-soft);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 30px;
  line-height: 1.28;
  letter-spacing: 0.01em;
  color: var(--cs-ivory);
  text-shadow: 1px 1px 0 var(--cs-dark-red), 3px 3px 0 rgba(200, 16, 46, 0.55);
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--on-dark);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 32px 0 0;
  padding: 0;
  background: var(--line-gold);
  border: 1px solid var(--line-gold);
}

.page-about .about-fact {
  padding: 16px 14px;
  background: rgba(26, 7, 40, 0.72);
}

.page-about .about-fact__label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cs-mist);
}

.page-about .about-fact__num {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 24px;
  line-height: 1.2;
  color: var(--cs-gold-soft);
}

/* ---------- 索引条 ---------- */

.page-about .about-index {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: var(--about-shell);
  margin: 0 auto;
  padding: 16px var(--about-pad) 0;
}

.page-about .about-index__label {
  flex: none;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cs-mist);
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 2px 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index .index-link {
  display: block;
  white-space: nowrap;
  padding: 6px 14px;
  font-size: 13px;
  font-family: var(--font-head);
  font-weight: 700;
  color: var(--cs-ink);
  text-decoration: none;
  background: #fff;
  border: 1px solid var(--line);
  transition: border-color 160ms ease, color 160ms ease, background 160ms ease;
}

.page-about .about-index .index-link:hover,
.page-about .about-index .index-link[data-active="true"] {
  color: var(--cs-jade);
  border-color: var(--cs-jade);
  background: rgba(46, 196, 182, 0.08);
}

/* ---------- 通用区块 ---------- */

.page-about .about-section {
  max-width: var(--about-shell);
  margin: 0 auto;
  padding: 48px var(--about-pad);
}

.page-about .about-section__head {
  position: relative;
  padding-left: 16px;
  border-left: 3px solid var(--cs-red);
}

.page-about .about-section__head .eyebrow {
  margin: 0 0 10px;
  color: var(--cs-dark-red);
  font-size: 11px;
  letter-spacing: 0.24em;
}

.page-about .about-section__head h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 24px;
  line-height: 1.4;
  color: var(--cs-ink);
}

.page-about .about-section__note {
  margin: 12px 0 0;
  max-width: 60ch;
  font-size: 15px;
  color: rgba(26, 26, 26, 0.72);
}

.page-about .prose p {
  margin: 0 0 16px;
}

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

/* 暗色区块 */

.page-about .about-section--dark {
  position: relative;
  max-width: none;
  padding: 52px var(--about-pad);
  background: linear-gradient(180deg, var(--cs-green) 0%, #082C21 60%, var(--cs-purple-deep) 100%);
  color: var(--cs-ivory);
}

.page-about .about-section--dark::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(0deg, var(--line-gold) 1px, transparent 1px);
  background-size: 100% 72px;
  opacity: 0.16;
  pointer-events: none;
}

.page-about .about-section--dark > * {
  position: relative;
  z-index: 1;
  max-width: var(--about-shell);
  margin-left: auto;
  margin-right: auto;
}

.page-about .about-section--dark .about-section__head {
  border-left-color: var(--cs-gold);
}

.page-about .about-section--dark .about-section__head .eyebrow {
  color: var(--cs-gold-soft);
}

.page-about .about-section--dark .about-section__head h2 {
  color: var(--cs-ivory);
}

.page-about .about-section--dark .about-section__note {
  color: var(--on-dark);
}

/* ---------- 起点：图文分栏 ---------- */

.page-about .about-origin {
  display: grid;
  gap: 28px;
  margin-top: 30px;
}

.page-about .about-origin__text {
  font-size: 16px;
}

.page-about .about-origin__figure {
  margin: 0;
}

/* ---------- 时间线 ---------- */

.page-about .timeline {
  position: relative;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--cs-gold) 0%, rgba(212, 175, 55, 0.12) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding-left: 38px;
  padding-bottom: 26px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 8px;
  width: 15px;
  height: 15px;
  background: var(--cs-red);
  border: 2px solid var(--cs-gold);
  transform: rotate(45deg);
  transition: background 180ms ease, transform 180ms ease;
}

.page-about .timeline__item:hover::before {
  background: var(--cs-jade);
  transform: rotate(45deg) scale(1.18);
}

.page-about .timeline__year {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--cs-gold-soft);
}

.page-about .timeline__card {
  padding: 18px 18px 20px;
  background: rgba(247, 243, 232, 0.06);
  border: 1px solid var(--line-gold);
  border-left: 3px solid var(--cs-gold);
  transition: border-color 180ms ease, background 180ms ease, transform 180ms ease;
}

.page-about .timeline__item:hover .timeline__card {
  background: rgba(247, 243, 232, 0.11);
  border-left-color: var(--cs-red);
  transform: translateX(3px);
}

.page-about .timeline__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.5;
  color: var(--cs-ivory);
}

.page-about .timeline__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--on-dark);
}

.page-about .timeline__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 14px;
}

.page-about .about-timeline-figure {
  margin: 36px 0 0;
}

/* ---------- 折叠面板 ---------- */

.page-about .about-folds {
  margin-top: 34px;
  border-top: 1px solid var(--line-gold);
}

.page-about .about-folds .fold {
  border-bottom: 1px solid var(--line-gold);
}

.page-about .about-folds .fold__trigger {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 18px 4px;
  background: none;
  border: 0;
  text-align: left;
  cursor: pointer;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  color: var(--cs-ivory);
  transition: color 160ms ease;
}

.page-about .about-folds .fold__trigger:hover {
  color: var(--cs-gold-soft);
}

.page-about .about-folds .fold__index {
  flex: none;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  font-size: 12px;
  color: var(--cs-gold);
  border: 1px solid var(--line-gold);
}

.page-about .about-folds .fold__title {
  flex: 1 1 auto;
}

.page-about .about-folds .fold__mark {
  flex: none;
  position: relative;
  width: 14px;
  height: 14px;
}

.page-about .about-folds .fold__mark::before,
.page-about .about-folds .fold__mark::after {
  content: "";
  position: absolute;
  background: var(--cs-gold);
  transition: transform 200ms ease, opacity 200ms ease;
}

.page-about .about-folds .fold__mark::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 1px;
}

.page-about .about-folds .fold__mark::after {
  left: 6px;
  top: 0;
  width: 1px;
  height: 14px;
}

.page-about .about-folds .fold__trigger[aria-expanded="true"] .fold__mark::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .about-folds .fold__panel {
  padding: 0 4px 22px 44px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--on-dark);
}

.page-about .about-folds .fold__panel p {
  margin: 0 0 12px;
}

.page-about .about-folds .fold__panel p:last-child {
  margin-bottom: 0;
}

/* ---------- 团队 ---------- */

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 30px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .team-card {
  padding: 24px 20px 26px;
  background: var(--cs-ivory);
  transition: background 180ms ease;
}

.page-about .team-card:hover {
  background: #fff;
}

.page-about .team-card__num {
  display: block;
  font-size: 38px;
  font-weight: 700;
  line-height: 1;
  color: var(--cs-red);
  letter-spacing: -0.02em;
}

.page-about .team-card h3 {
  margin: 12px 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  color: var(--cs-ink);
}

.page-about .team-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(26, 26, 26, 0.72);
}

.page-about .about-team-foot {
  display: grid;
  gap: 26px;
  margin-top: 32px;
}

.page-about .about-team-figure {
  margin: 0;
}

.page-about .about-team-note {
  font-size: 15px;
  line-height: 1.9;
}

/* ---------- 理念 ---------- */

.page-about .about-section--idea {
  max-width: none;
  background: linear-gradient(120deg, var(--cs-purple-deep) 0%, var(--cs-dark-red) 100%);
  color: var(--cs-ivory);
}

.page-about .about-section--idea > * {
  max-width: var(--about-shell);
  margin-left: auto;
  margin-right: auto;
}

.page-about .about-section--idea .about-section__head {
  border-left-color: var(--cs-gold);
}

.page-about .about-section--idea .about-section__head h2 {
  color: var(--cs-ivory);
}

.page-about .about-section--idea .about-section__head .eyebrow {
  color: var(--cs-gold-soft);
}

.page-about .idea-grid {
  display: grid;
  gap: 18px;
  margin-top: 30px;
}

.page-about .idea-card {
  padding: 22px 20px 24px;
  background: rgba(247, 243, 232, 0.07);
  border: 1px solid var(--line-gold);
  transition: border-color 180ms ease, background 180ms ease;
}

.page-about .idea-card:hover {
  background: rgba(247, 243, 232, 0.12);
  border-color: var(--cs-gold);
}

.page-about .idea-card__mark {
  display: inline-block;
  margin-bottom: 12px;
  padding: 3px 10px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cs-gold-soft);
  border: 1px solid var(--line-gold);
}

.page-about .idea-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 17px;
  color: var(--cs-ivory);
}

.page-about .idea-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--on-dark);
}

.page-about .idea-note {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-top: 30px;
  padding-top: 24px;
  border-top: 1px solid var(--line-gold);
}

.page-about .idea-note p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--on-dark);
}

.page-about .idea-note .btn {
  align-self: flex-start;
}

/* ---------- 荣誉 ---------- */

.page-about .about-section--honor {
  background: var(--cs-ivory);
}

.page-about .honor-list {
  display: grid;
  gap: 1px;
  margin-top: 30px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .honor-item {
  position: relative;
  display: grid;
  gap: 14px;
  padding: 24px 20px 26px;
  background: var(--cs-ivory);
}

.page-about .honor-item__year {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--cs-dark-red);
}

.page-about .honor-item__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 17px;
  color: var(--cs-ink);
}

.page-about .honor-item__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(26, 26, 26, 0.74);
}

.page-about .honor-item__seal {
  position: absolute;
  top: 18px;
  right: 18px;
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cs-red);
  background: rgba(200, 16, 46, 0.06);
  border: 2px solid var(--cs-red);
  transform: rotate(-6deg);
  opacity: 0.9;
}

.page-about .about-cta {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-top: 34px;
  padding: 26px 20px;
  background: linear-gradient(120deg, var(--cs-green) 0%, var(--cs-purple-deep) 100%);
  border-left: 4px solid var(--cs-gold);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--on-dark);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 页内索引尾条 ---------- */

.page-about .about-foot-index {
  max-width: var(--about-shell);
  margin: 0 auto;
  padding: 28px var(--about-pad) 56px;
  border-top: 1px solid var(--line);
}

.page-about .about-foot-index__label {
  display: block;
  margin-bottom: 12px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--cs-mist);
}

.page-about .about-foot-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-foot-index__list a {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 14px;
  color: var(--cs-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  transition: color 160ms ease, border-color 160ms ease;
}

.page-about .about-foot-index__list a:hover {
  color: var(--cs-jade);
  border-bottom-color: var(--cs-jade);
}

/* ---------- 图片容器补充 ---------- */

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

/* ---------- 窄屏微调 ---------- */

@media (max-width: 359px) {
  .page-about .about-hero h1 {
    font-size: 25px;
  }
  .page-about .about-fact__num {
    font-size: 20px;
  }
}

/* ---------- 平板 ---------- */

@media (min-width: 700px) {
  .page-about {
    --about-pad: 32px;
  }

  .page-about .about-hero {
    padding: 60px 0;
  }

  .page-about .about-hero h1 {
    font-size: 40px;
  }

  .page-about .about-hero__lead {
    font-size: 17px;
  }

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

  .page-about .about-section {
    padding: 64px var(--about-pad);
  }

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

  .page-about .about-origin {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: start;
    gap: 36px;
  }

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

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

  .page-about .idea-note {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .page-about .honor-item {
    grid-template-columns: 96px 1fr;
    gap: 24px;
    align-items: start;
    padding: 28px 100px 30px 24px;
  }

  .page-about .about-team-foot {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: start;
    gap: 32px;
  }

  .page-about .about-cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 30px 28px;
  }
}

/* ---------- 桌面 ---------- */

@media (min-width: 900px) {
  .page-about {
    --about-pad: 40px;
  }

  .page-about .about-hero h1 {
    font-size: 48px;
    max-width: 20ch;
  }

  .page-about .timeline::before {
    left: 88px;
  }

  .page-about .timeline__item {
    padding-left: 132px;
    padding-bottom: 34px;
  }

  .page-about .timeline__item::before {
    left: 81px;
  }

  .page-about .timeline__year {
    position: absolute;
    left: 0;
    top: 4px;
    width: 70px;
    margin: 0;
    text-align: right;
    font-size: 18px;
  }

  .page-about .timeline__card {
    padding: 22px 24px 24px;
  }
}

@media (min-width: 1080px) {
  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .timeline__item:nth-child(odd) .timeline__card {
    max-width: 100%;
  }

  .page-about .timeline__item:nth-child(even) .timeline__card {
    max-width: 78%;
  }

  .page-about .about-folds .fold__panel {
    max-width: 78ch;
  }
}