.page-about {
  --about-max: 1160px;
  background-color: var(--paper);
  background-image:
    radial-gradient(rgba(43, 33, 24, 0.045) 1px, transparent 1px),
    linear-gradient(180deg, rgba(29, 53, 87, 0.02) 0%, rgba(29, 53, 87, 0) 300px);
  background-size: 24px 24px, 100% 100%;
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.85;
  overflow-x: clip;
}

.page-about ::selection {
  background: var(--ember);
  color: #fff;
}

/* ===== 面包屑 ===== */
.page-about .crumb {
  max-width: var(--about-max);
  margin-inline: auto;
  padding: 22px 24px 0;
}

.page-about .crumb__link {
  color: var(--ocean);
  text-underline-offset: 4px;
}

.page-about .crumb__current {
  color: rgba(43, 33, 24, 0.72);
}

/* ===== 首屏海报 ===== */
.page-about .about-hero {
  max-width: var(--about-max);
  margin-inline: auto;
  padding: 48px 24px 36px;
  position: relative;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}

.page-about .about-hero__inner::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, transparent 49.5%, rgba(29, 53, 87, 0.04) 50%, transparent 50.5%),
    linear-gradient(0deg, transparent 49.5%, rgba(29, 53, 87, 0.04) 50%, transparent 50.5%);
  pointer-events: none;
}

.page-about .about-hero__content {
  position: relative;
  z-index: 2;
}

.page-about .about-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px;
  background: var(--ocean);
  color: var(--cream);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  border-radius: 2px;
  margin-bottom: 22px;
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-weight: 300;
  font-size: clamp(38px, 7vw, 68px);
  line-height: 1.08;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.page-about .about-hero__title span {
  display: block;
  font-size: 0.55em;
  font-weight: 400;
  color: var(--ocean);
  letter-spacing: 0.04em;
  margin-top: 12px;
  max-width: 24ch;
}

.page-about .about-hero__lede {
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.95;
  color: rgba(43, 33, 24, 0.82);
}

.page-about .about-hero__index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}

.page-about .about-hero__index-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px 6px 6px;
  background: var(--cream);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink);
  text-decoration: none;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}

.page-about .about-hero__index-item:hover {
  border-color: var(--gold);
  transform: translateY(-2px);
  box-shadow: 4px 4px 0 rgba(29, 53, 87, 0.08);
}

.page-about .about-hero__index-num {
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--ember);
  color: #fff;
  font-size: 11px;
  font-weight: 600;
}

.page-about .about-hero__index-label {
  font-size: 12px;
}

.page-about .about-hero__map {
  width: 100%;
  max-width: 320px;
  margin: 0 auto;
  display: block;
  background: var(--cream);
  border: 1px solid var(--line);
  outline: 1px solid var(--line);
  outline-offset: 8px;
  padding: 14px;
  box-sizing: border-box;
}

/* ===== 章节通用 ===== */
.page-about .about-chapter {
  position: relative;
  padding: 64px 24px 56px;
  border-top: 1px dashed rgba(184, 169, 142, 0.6);
  isolation: isolate;
}

.page-about .about-chapter::before {
  content: "";
  position: absolute;
  top: -10px;
  left: 0;
  right: 0;
  height: 16px;
  background:
    linear-gradient(135deg, var(--cream) 50%, transparent 50%) 0 0 / 16px 16px repeat-x,
    linear-gradient(225deg, var(--cream) 50%, transparent 50%) 8px 0 / 16px 16px repeat-x;
  opacity: 0.7;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-chapter__num {
  position: absolute;
  top: 8px;
  right: 16px;
  font-family: var(--font-mono);
  font-size: clamp(96px, 16vw, 180px);
  line-height: 1;
  font-weight: 800;
  color: rgba(29, 53, 87, 0.07);
  user-select: none;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-chapter__grid {
  position: relative;
  z-index: 1;
  max-width: var(--about-max);
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .about-chapter__aside {
  position: relative;
  padding-bottom: 8px;
}

.page-about .about-chapter__aside .section-title {
  margin: 10px 0 0;
}

.page-about .about-chapter__aside-note {
  margin-top: 14px;
  font-size: 14px;
  color: rgba(43, 33, 24, 0.68);
  border-left: 2px solid var(--gold);
  padding-left: 14px;
  max-width: 36ch;
}

.page-about .about-chapter__main {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.page-about .about-chapter__text p {
  color: rgba(43, 33, 24, 0.84);
  max-width: 62ch;
}

.page-about .about-chapter__text p + p {
  margin-top: 14px;
}

/* ===== 事实清单 ===== */
.page-about .about-facts {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.page-about .about-facts li {
  background: var(--cream);
  border: 1px solid var(--line);
  padding: 14px 8px;
  font-size: 12px;
  text-align: center;
  border-radius: 4px;
  color: rgba(43, 33, 24, 0.78);
  line-height: 1.5;
}

.page-about .about-facts li span {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  color: var(--ember);
  margin-bottom: 4px;
}

/* ===== 图片图组 ===== */
.page-about .about-chapter__media {
  margin: 0;
  position: relative;
}

.page-about .about-chapter__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  box-shadow: 8px 8px 0 rgba(43, 33, 24, 0.08);
}

.page-about .about-chapter__media figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ocean);
  letter-spacing: 0.04em;
}

.page-about .about-chapter__media--panel {
  max-width: 440px;
}

.page-about .about-chapter__media--wide img {
  max-height: 520px;
  object-fit: cover;
}

/* ===== 时间线 ===== */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 23px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--line) 60%, rgba(184, 169, 142, 0.3) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 26px 64px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--ocean);
  border: 3px solid var(--paper);
  box-shadow: 0 0 0 2px var(--gold);
  z-index: 0;
}

.page-about .about-timeline__marker {
  position: absolute;
  left: 0;
  top: 8px;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 15px;
  color: var(--cream);
  z-index: 1;
}

.page-about .about-timeline__panel {
  background: var(--cream);
  border: 1px solid var(--line);
  padding: 16px 18px;
  border-radius: 6px;
  box-shadow: 4px 4px 0 rgba(43, 33, 24, 0.05);
  transition: transform 0.2s, box-shadow 0.2s;
}

.page-about .about-timeline__panel:hover {
  transform: translateY(-2px);
  box-shadow: 6px 6px 0 rgba(29, 53, 87, 0.08);
}

.page-about .about-timeline__badge {
  display: inline-block;
  padding: 2px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ocean);
  border: 1px solid var(--gold);
  border-radius: 999px;
  letter-spacing: 0.04em;
  margin-bottom: 6px;
}

.page-about .about-timeline__title {
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 500;
  margin: 0 0 4px;
}

.page-about .about-timeline__panel p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(43, 33, 24, 0.78);
}

/* ===== 迁移对照 ===== */
.page-about .about-shift {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  background: var(--ocean);
  color: var(--cream);
  padding: 18px 20px;
  border-radius: 6px;
  box-shadow: 6px 6px 0 rgba(29, 53, 87, 0.12);
}

.page-about .about-shift__from,
.page-about .about-shift__to {
  font-family: var(--font-head);
  font-weight: 500;
  font-size: 15px;
}

.page-about .about-shift__from {
  text-decoration: line-through;
  opacity: 0.8;
}

.page-about .about-shift__arrow {
  font-family: var(--font-mono);
  color: var(--gold);
  font-size: 20px;
}

.page-about .about-shift__to {
  color: var(--gold);
  font-weight: 600;
}

/* ===== 步骤 ===== */
.page-about .about-steps {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-steps__item {
  display: flex;
  gap: 16px;
  background: var(--cream);
  border: 1px solid var(--line);
  padding: 18px 18px 16px;
  border-radius: 6px;
  transition: transform 0.2s, box-shadow 0.2s;
}

.page-about .about-steps__item:hover {
  transform: translateY(-3px);
  box-shadow: 6px 6px 0 rgba(29, 53, 87, 0.08);
}

.page-about .about-steps__num {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--gold);
  line-height: 1;
}

.page-about .about-steps__item h3 {
  font-family: var(--font-head);
  font-size: 15px;
  margin: 0 0 4px;
}

.page-about .about-steps__item p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(43, 33, 24, 0.78);
}

/* ===== 分类统计 ===== */
.page-about .about-catalog__stat {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 20px;
  background: var(--ocean);
  color: var(--cream);
  border-radius: 6px;
  box-shadow: 6px 6px 0 rgba(29, 53, 87, 0.12);
}

.page-about .about-catalog__stat-num {
  font-family: var(--font-mono);
  font-size: 52px;
  font-weight: 700;
  color: var(--gold);
  line-height: 1;
}

.page-about .about-catalog__stat-label {
  font-size: 14px;
  font-family: var(--font-body);
}

.page-about .about-catalog__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.page-about .about-catalog__list li {
  background: var(--cream);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 10px 14px;
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: rgba(43, 33, 24, 0.86);
}

.page-about .about-catalog__list li::before {
  content: "▸";
  color: var(--ember);
  font-size: 12px;
}

.page-about .about-catalog__more {
  font-size: 13px;
  color: rgba(43, 33, 24, 0.66);
  border-left: 2px solid var(--line);
  padding-left: 12px;
  margin: 4px 0 0;
}

/* ===== 资质徽章 ===== */
.page-about .about-badges {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-badges li {
  padding: 6px 14px;
  border: 1px solid var(--gold);
  color: var(--ocean);
  font-family: var(--font-mono);
  font-size: 12px;
  border-radius: 999px;
  background: var(--cream);
}

/* ===== 收束 CTA ===== */
.page-about .about-closing {
  max-width: var(--about-max);
  margin: 0 auto;
  padding: 56px 24px 72px;
}

.page-about .about-closing__inner {
  border-top: 2px solid var(--ocean);
  border-bottom: 1px solid var(--line);
  padding: 38px 0 30px;
  text-align: center;
}

.page-about .about-closing .section-title {
  margin-top: 8px;
  margin-bottom: 8px;
}

.page-about .about-closing__text {
  max-width: 52ch;
  margin-inline: auto;
  color: rgba(43, 33, 24, 0.78);
  font-size: 15px;
}

.page-about .about-closing__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 24px;
}

.page-about .about-closing__note {
  margin-top: 22px;
  font-size: 13px;
  color: rgba(43, 33, 24, 0.6);
}

.page-about .about-closing__note a {
  color: var(--ocean);
  text-underline-offset: 3px;
}

/* ===== 响应式 ===== */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding-top: 72px;
    padding-bottom: 48px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: 1.2fr 0.8fr;
  }

  .page-about .about-hero__title {
    font-size: clamp(46px, 5vw, 64px);
  }

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

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

  .page-about .about-steps__item {
    flex-direction: column;
  }
}

@media (min-width: 1024px) {
  .page-about .about-chapter {
    padding-top: 88px;
    padding-bottom: 80px;
  }

  .page-about .about-chapter__grid {
    grid-template-columns: 4fr 8fr;
    gap: 44px;
  }

  .page-about .about-chapter__aside {
    border-right: 1px solid var(--line);
    padding-right: 28px;
  }

  .page-about .about-chapter__main {
    padding-left: 6px;
  }

  .page-about .about-hero__title {
    font-size: 76px;
  }

  .page-about .about-hero__map {
    max-width: 340px;
  }

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