.page-about {
  --about-rule: rgba(20, 16, 15, 0.14);
  background: var(--paper);
  color: var(--ink);
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 22px 0 4px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--smoke);
}

.page-about .crumbs__link {
  color: var(--cinnabar-deep);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .crumbs__link:hover,
.page-about .crumbs__link:focus-visible {
  border-bottom-color: var(--cinnabar);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-top: 18px;
  padding-bottom: 52px;
  border-top: 6px solid var(--cinnabar);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 28px;
}

.page-about .about-hero__text h1 {
  margin: 14px 0 16px;
  color: var(--ink);
}

.page-about .about-hero__text .lede {
  max-width: 40ch;
  color: var(--ink-2);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--sand);
}

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

/* ---------- 主体骨架 ---------- */
.page-about .about-layout {
  padding-top: 8px;
  padding-bottom: 72px;
  display: grid;
  gap: 30px;
}

/* ---------- 左侧目录 ---------- */
.page-about .about-toc {
  border-top: 2px solid var(--ink);
  padding-top: 14px;
}

.page-about .about-toc__title {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--smoke);
}

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

.page-about .about-toc__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 0;
  font-family: var(--sans);
  font-size: 15px;
  color: var(--ink-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-toc__num {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--gold-deep);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--cinnabar-deep);
  border-bottom-color: var(--cinnabar);
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  scroll-margin-top: 24px;
  padding: 34px 0 6px;
}

.page-about .about-section + .about-section {
  border-top: 1px solid var(--about-rule);
  margin-top: 34px;
}

.page-about .about-section__kicker {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--celadon);
  text-transform: uppercase;
}

.page-about .about-section h2 {
  margin: 0 0 18px;
  color: var(--ink);
}

.page-about .about-section .prose {
  max-width: 40em;
  color: var(--ink-2);
}

.page-about .about-section .prose + .prose {
  margin-top: 14px;
}

.page-about .about-section .prose a {
  color: var(--cinnabar-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--cinnabar);
}

.page-about .about-section .prose a:hover {
  background: rgba(178, 58, 46, 0.08);
}

/* ---------- 引言条 ---------- */
.page-about .about-quote {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  padding: 16px 20px;
  background: var(--sand);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--cinnabar);
}

.page-about .about-quote__num {
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--gold-deep);
  white-space: nowrap;
}

.page-about .about-quote__text {
  font-family: var(--serif);
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-2);
}

/* ---------- 阶段快捷胶囊 ---------- */
.page-about .about-jump {
  list-style: none;
  margin: 22px 0 6px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-jump__link {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--sand);
  color: var(--ink-2);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-jump__link:hover,
.page-about .about-jump__link:focus-visible {
  background: var(--cinnabar);
  color: var(--paper);
}

/* ---------- 时间轴 ---------- */
.page-about .tl {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cinnabar) 0%, var(--celadon) 55%, var(--sand) 100%);
}

.page-about .tl__item {
  position: relative;
  padding-left: 40px;
  margin-bottom: 40px;
}

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

.page-about .tl__dot {
  position: absolute;
  left: 0;
  top: 26px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--cinnabar);
  box-shadow: 0 0 0 4px var(--paper);
  z-index: 1;
}

.page-about .tl__card {
  position: relative;
  overflow: hidden;
  padding: 22px 22px 22px;
  border-radius: var(--radius-md);
  background: #FFFCF5;
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .tl__card:hover {
  background: var(--sand);
  box-shadow: inset 0 0 0 1px var(--cinnabar);
}

.page-about .tl__big {
  position: absolute;
  top: -22px;
  right: 4px;
  font-family: var(--mono);
  font-size: 96px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.05em;
  color: var(--cinnabar);
  opacity: 0.08;
  pointer-events: none;
  user-select: none;
}

.page-about .tl__meta {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gold-deep);
}

.page-about .tl__title {
  margin: 0 0 10px;
  font-family: var(--sans);
  font-size: 20px;
  font-weight: 900;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .tl__text {
  margin: 0 0 12px;
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .tl__figure {
  margin: 14px 0 16px;
  max-width: 220px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--sand);
}

.page-about .tl__tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  border: 1px solid var(--celadon);
  color: var(--celadon);
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.04em;
}

/* ---------- 六类栏目 ---------- */
.page-about .about-cols {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-cols__item {
  padding: 18px 0 0;
  border-top: 2px solid var(--ink);
}

.page-about .about-cols__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--gold-deep);
}

.page-about .about-cols__name {
  margin: 0 0 8px;
  font-family: var(--sans);
  font-size: 20px;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--cinnabar-deep);
}

.page-about .about-cols__q {
  margin: 0;
  font-family: var(--serif);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-2);
}

/* ---------- 条目统计条 ---------- */
.page-about .about-statline {
  margin: 28px 0 20px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-rule);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-statline__cell {
  padding: 18px 16px;
  background: var(--ink);
  display: grid;
  gap: 6px;
}

.page-about .about-statline__num {
  font-family: var(--mono);
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--gold);
}

.page-about .about-statline__label {
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: #D8CFC1;
}

/* ---------- 团队 ---------- */
.page-about .about-team__figure {
  margin: 0 0 24px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--sand);
}

.page-about .team-grid {
  list-style: none;
  margin: 24px 0 20px;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
}

.page-about .team-grid__item {
  padding: 20px 18px;
  background: var(--sand);
}

.page-about .team-grid__item:nth-child(even) {
  background: #E2D4BC;
}

.page-about .team-grid__num {
  display: block;
  font-family: var(--mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cinnabar);
}

.page-about .team-grid__role {
  margin: 8px 0 6px;
  font-family: var(--sans);
  font-size: 17px;
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-about .team-grid__desc {
  margin: 0;
  font-family: var(--serif);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-2);
}

/* ---------- 场地与城市 ---------- */
.page-about .about-facts {
  margin: 26px 0 22px;
  padding: 0;
  border-top: 2px solid var(--ink);
}

.page-about .about-facts__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-facts dt {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--celadon);
}

.page-about .about-facts dd {
  margin: 0;
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink-2);
}

/* ---------- 三件事 ---------- */
.page-about .about-promise {
  margin-top: 26px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-promise__item {
  position: relative;
  padding: 22px 20px 22px 22px;
  background: #FFFCF5;
  border-radius: var(--radius-md);
  border-left: 4px solid var(--celadon);
  transition: box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-promise__item:hover {
  border-left-color: var(--cinnabar);
  box-shadow: inset 0 0 0 1px rgba(178, 58, 46, 0.35);
}

.page-about .about-promise__num {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gold-deep);
}

.page-about .about-promise__title {
  margin: 8px 0 8px;
  font-family: var(--sans);
  font-size: 20px;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-promise__text {
  margin: 0;
  font-family: var(--serif);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-2);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  margin-top: 40px;
  padding: 32px 24px;
  border-radius: var(--radius-lg);
  background: var(--ink);
  color: var(--paper);
}

.page-about .about-cta__eyebrow {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--celadon-on-ink);
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--sans);
  font-size: 26px;
  font-weight: 900;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 0 0 22px;
  max-width: 40em;
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.8;
  color: #D8CFC1;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 中屏 ---------- */
@media (min-width: 720px) {
  .page-about .about-cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 28px;
  }

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

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

  .page-about .about-facts__row {
    grid-template-columns: 160px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }

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

  .page-about .about-cta {
    padding: 40px 36px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero {
    padding-top: 26px;
    padding-bottom: 76px;
    border-top-width: 0;
  }

  .page-about .about-hero::after {
    content: "";
    position: absolute;
    top: -16%;
    right: -8%;
    width: 64%;
    height: 132%;
    background: var(--cinnabar);
    clip-path: polygon(20% 0, 100% 0, 100% 100%, 0 100%);
    border-bottom-left-radius: 72px;
    z-index: 0;
    pointer-events: none;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 1.02fr 0.98fr;
    align-items: center;
    gap: 48px;
  }

  .page-about .about-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
    padding-top: 18px;
  }

  .page-about .about-toc {
    position: sticky;
    top: 24px;
  }

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

  .page-about .about-cta {
    padding: 48px 48px;
  }

  .page-about .about-cta__title {
    font-size: 34px;
  }

  /* 时间轴左右错位 */
  .page-about .tl::before {
    left: 50%;
    margin-left: -1px;
  }

  .page-about .tl__item {
    width: calc(50% - 48px);
    padding-left: 0;
    margin-bottom: 48px;
  }

  .page-about .tl__item:nth-child(even) {
    margin-left: calc(50% + 48px);
  }

  .page-about .tl__dot {
    top: 28px;
    left: auto;
  }

  .page-about .tl__item:nth-child(odd) .tl__dot {
    right: -55px;
  }

  .page-about .tl__item:nth-child(even) .tl__dot {
    left: -55px;
  }

  .page-about .tl__big {
    font-size: 120px;
    top: -26px;
  }
}
</main>