.page-about {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  overflow-x: hidden;
}

/* 面包屑 */
.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 22px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
}
.page-about .crumbs li {
  display: flex;
  align-items: center;
  color: var(--index-gray);
}
.page-about .crumbs li:not(:first-child)::before {
  content: "／";
  padding: 0 8px;
  color: var(--blueprint);
}
.page-about .crumbs a {
  color: var(--sea);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.14s ease, color 0.14s ease;
}
.page-about .crumbs a:hover {
  color: var(--ink);
  border-bottom-color: var(--orange);
}

/* 首屏 */
.page-about .about-hero {
  padding: 26px 0 54px;
  border-bottom: var(--hair);
}
.page-about .about-hero__inner {
  display: grid;
  gap: 22px;
}
.page-about .about-hero__rail {
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--sea);
}
.page-about .about-hero__rail-num {
  color: var(--orange);
  font-size: 13px;
}
.page-about .about-hero__title {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: clamp(30px, 8.4vw, 54px);
  line-height: 1.16;
  letter-spacing: -0.012em;
  margin: 14px 0 0;
  max-width: 22ch;
}
.page-about .about-hero__lede {
  font-size: 17px;
  line-height: 1.8;
  color: var(--sea);
  max-width: 44em;
  margin: 22px 0 0;
}
.page-about .about-hero__links {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 26px;
  font-size: 15px;
}

/* 章节骨架 */
.page-about .chapter {
  padding: 50px 0;
  border-bottom: var(--hair);
}
.page-about .chapter__inner {
  display: grid;
  gap: 20px;
}
.page-about .chapter__side {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--sea);
}
.page-about .chapter__num {
  color: var(--orange);
  font-size: 13px;
}
.page-about .chapter__body {
  display: grid;
  gap: 32px;
  min-width: 0;
}
.page-about .chapter__col {
  min-width: 0;
}
.page-about .chapter__title {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: clamp(24px, 5.4vw, 34px);
  line-height: 1.3;
  letter-spacing: -0.008em;
  margin: 0 0 22px;
}
.page-about .chapter__lead p {
  font-size: 17px;
  line-height: 1.78;
  margin: 0 0 18px;
  max-width: 40em;
}
.page-about .chapter__lead p:last-child {
  margin-bottom: 0;
}
.page-about .chapter__col p {
  font-size: 17px;
  line-height: 1.78;
  margin: 0 0 18px;
  max-width: 40em;
}

/* 旁注 */
.page-about .chapter__aside {
  border-top: 2px solid var(--ink);
  padding-top: 18px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--sea);
  min-width: 0;
}
.page-about .aside__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--orange);
  margin: 0 0 14px;
}
.page-about .aside__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .aside__list li {
  position: relative;
  padding-left: 18px;
}
.page-about .aside__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 9px;
  height: 2px;
  background: var(--celadon);
}

/* 图片 */
.page-about .chapter__figure {
  margin: 36px 0 0;
}
.page-about .chapter__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: var(--hair);
  background: var(--blueprint);
}
.page-about .media__caption {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  line-height: 1.7;
  color: var(--index-gray);
  margin-top: 10px;
}

/* 团队 */
.page-about .team-jump {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 24px 0 26px;
  font-size: 14px;
}
.page-about .team-jump .mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--index-gray);
  margin-right: 4px;
}
.page-about .team-jump a {
  display: inline-block;
  padding: 11px 15px;
  border: var(--hair);
  color: var(--sea);
  text-decoration: none;
  transition: border-color 0.14s ease, color 0.14s ease, background-color 0.14s ease;
}
.page-about .team-jump a:hover,
.page-about .team-jump a:focus-visible {
  border-color: var(--orange);
  color: var(--ink);
  background: var(--orange-pale);
}
.page-about .team-card {
  border: var(--hair);
  border-left: 3px solid var(--celadon);
  padding: 18px 20px;
  margin: 0 0 16px;
  transition: border-left-color 0.14s ease, box-shadow 0.14s ease;
}
.page-about .team-card:hover,
.page-about .team-card:target {
  border-left-color: var(--orange);
  box-shadow: 5px 5px 0 0 var(--blueprint);
}
.page-about .team-card__name {
  font-family: var(--font-title);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.01em;
  margin: 0 0 8px;
}
.page-about .team-card p {
  font-size: 15px;
  line-height: 1.72;
  color: var(--sea);
  margin: 0;
}

/* 版本刻度 */
.page-about .ver-line {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}
.page-about .ver {
  border-top: 1px solid var(--blueprint);
  padding-top: 14px;
  min-width: 0;
}
.page-about .ver__label {
  font-family: var(--font-mono);
  font-size: 20px;
  letter-spacing: 0.02em;
  color: var(--sea);
}
.page-about .ver__name {
  display: inline-block;
  margin-left: 10px;
  font-size: 14px;
  color: var(--index-gray);
}
.page-about .ver__detail {
  font-size: 15px;
  line-height: 1.72;
  color: var(--sea);
  margin: 8px 0 0;
}

/* 深色档案带 */
.page-about .about-archive {
  background: var(--ink);
  color: var(--paper);
  padding: 50px 0;
  border-bottom: var(--hair);
  position: relative;
}
.page-about .about-archive .chapter__side {
  color: var(--celadon);
}
.page-about .about-archive .chapter__num {
  color: var(--orange);
}
.page-about .about-archive .chapter__title {
  color: var(--paper);
}
.page-about .about-archive .chapter__lead p {
  color: rgba(243, 245, 241, 0.82);
}
.page-about .about-archive .chapter__aside {
  border-top-color: var(--celadon);
  color: rgba(243, 245, 241, 0.78);
}
.page-about .about-archive .aside__list li::before {
  background: var(--orange);
}
.page-about .about-archive .chapter__figure img {
  border-color: rgba(199, 213, 222, 0.32);
}
.page-about .about-archive .media__caption {
  color: rgba(243, 245, 241, 0.58);
}

.page-about .beat-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}
.page-about .beat {
  border-left: 2px solid var(--celadon);
  padding-left: 18px;
  display: grid;
  gap: 6px;
}
.page-about .beat__label {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--orange);
}
.page-about .beat__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.74;
  color: rgba(243, 245, 241, 0.84);
  max-width: 40em;
}

/* 访问数据 */
.page-about .stat-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}
.page-about .stat-list li {
  display: grid;
  gap: 4px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--blueprint);
}
.page-about .stat-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: 24px;
  letter-spacing: 0.02em;
  color: var(--ink);
}
.page-about .stat-cap {
  font-size: 14px;
  line-height: 1.6;
  color: var(--sea);
}

/* 联系信息 */
.page-about .about-info {
  padding: 50px 0 72px;
}
.page-about .info-list {
  margin: 28px 0 0;
  border-top: var(--hair);
}
.page-about .info-row {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-bottom: var(--hair);
}
.page-about .info-row dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--index-gray);
}
.page-about .info-row dd {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  word-break: break-word;
}
.page-about .info-row dd .mono {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}
.page-about .info-mail {
  color: var(--sea);
  text-decoration: none;
  border-bottom: 1px solid var(--blueprint);
  transition: border-color 0.14s ease, color 0.14s ease;
}
.page-about .info-mail:hover {
  color: var(--ink);
  border-bottom-color: var(--orange);
}
.page-about .about-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 36px;
  padding: 13px 18px;
  border: var(--hair);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--sea);
  text-decoration: none;
  transition: border-color 0.14s ease, color 0.14s ease, background-color 0.14s ease;
}
.page-about .about-top::before {
  content: "↑";
  font-size: 15px;
}
.page-about .about-top:hover,
.page-about .about-top:focus-visible {
  border-color: var(--orange);
  color: var(--ink);
  background: var(--orange-pale);
}

/* 焦点 */
.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

/* 桌面端 */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 60px 0 96px;
  }
  .page-about .about-hero__inner {
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }
  .page-about .about-hero__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    height: 100%;
    padding-left: 16px;
    border-left: 2px solid var(--orange);
  }
  .page-about .about-hero__rail-text {
    writing-mode: vertical-rl;
    letter-spacing: 0.36em;
  }

  .page-about .chapter {
    padding: 88px 0;
  }
  .page-about .about-archive {
    padding: 88px 0;
  }
  .page-about .about-info {
    padding: 88px 0 110px;
  }
  .page-about .chapter__inner {
    grid-template-columns: 76px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }
  .page-about .chapter__side {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    position: sticky;
    top: 48px;
  }
  .page-about .chapter__body {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: start;
  }
  .page-about .chapter--flip .chapter__body {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
  .page-about .chapter--flip .chapter__lead {
    order: 2;
  }
  .page-about .chapter--flip .chapter__aside {
    order: 1;
  }
  .page-about .chapter__figure {
    grid-column: 1 / -1;
    margin-top: 48px;
  }
  .page-about .info-row {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 28px;
    align-items: baseline;
    padding: 22px 0;
  }
}

@media (min-width: 760px) {
  .page-about .ver-line {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    margin-top: 44px;
  }
  .page-about .ver {
    border-top: 2px solid var(--blueprint);
    border-right: var(--hair);
    padding: 22px 24px 0 0;
  }
  .page-about .ver:last-child {
    border-right: 0;
    padding-right: 0;
  }
  .page-about .ver__detail {
    opacity: 0.55;
    transition: opacity 0.15s ease;
  }
  .page-about .ver:hover .ver__detail,
  .page-about .ver:focus-within .ver__detail {
    opacity: 1;
  }
  .page-about .ver:hover .ver__label,
  .page-about .ver:focus-within .ver__label {
    color: var(--orange);
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__title {
    font-size: 56px;
  }
  .page-about .chapter__body {
    gap: 72px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
  }
}