.page-about {
  --about-rule: rgba(36, 30, 26, 0.14);
  --about-shadow: 4px 4px 0 rgba(36, 30, 26, 0.09);
}

.page-about .crumbs {
  margin: 24px 0 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .crumbs a {
  color: var(--brown);
  text-decoration: none;
}

.page-about .crumbs a:hover {
  color: var(--gold);
}

.page-about .crumbs__sep {
  margin: 0 6px;
  color: var(--mist);
}

/* 首屏 */
.page-about .about-hero {
  padding: 28px 0 0;
}

.page-about .about-hero .eyebrow {
  margin: 0 0 14px;
  color: var(--mist);
}

.page-about .about-hero h1 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 34px;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--brown);
}

.page-about .about-hero .lede {
  margin: 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--brown);
}

.page-about .hero-stats {
  list-style: none;
  margin: 28px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--about-rule);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px 16px;
}

.page-about .hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .hero-stats .k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .hero-stats .v {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 24px;
  letter-spacing: -0.01em;
  color: var(--brown);
}

.page-about .hero-stats .v small {
  margin-left: 3px;
  font-size: 12px;
  font-weight: 500;
  color: var(--mist);
}

/* 通用章节头与导语 */
.page-about .about-sec {
  padding-top: 56px;
}

.page-about .sec-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 16px;
}

.page-about .sec-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .sec-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 22px;
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--brown);
}

.page-about .about-lead {
  margin: 0 0 8px;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--brown);
}

.page-about .about-note {
  margin: 20px 0 0;
  max-width: 36em;
  font-size: 14px;
  line-height: 1.75;
  color: var(--brown);
  opacity: 0.86;
}

.page-about .about-note--wide {
  margin-top: 24px;
}

.page-about .about-note a {
  color: var(--brown);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
  padding-bottom: 1px;
}

.page-about .about-note a:hover {
  color: var(--gold);
}

/* 01 时间轴 */
.page-about .about-timeline {
  position: relative;
  margin-top: 40px;
  padding: 40px 0 32px;
  background: var(--paper-2);
  overflow: hidden;
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: 0;
  opacity: 0.12;
  pointer-events: none;
}

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

.page-about .about-timeline .container {
  position: relative;
  z-index: 1;
}

.page-about .tl {
  position: relative;
  margin: 20px 0 0;
  padding: 0;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 12px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(201, 162, 39, 0.22) 100%);
}

.page-about .tl-item {
  position: relative;
  padding-left: 34px;
  margin: 0 0 6px;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .tl-item:last-child {
  border-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 14px;
  height: 14px;
  box-sizing: border-box;
  border: 2px solid var(--gold);
  border-radius: 50%;
  background: var(--paper-2);
  transition: background-color 200ms ease, box-shadow 200ms ease;
}

.page-about .tl-item[open]::before {
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(201, 162, 39, 0.18);
}

.page-about .tl-item > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  padding: 8px 0 14px;
  cursor: pointer;
  list-style: none;
}

.page-about .tl-item > summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-item > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--mist);
}

.page-about .tl-item[open] > summary::after {
  content: "−";
  color: var(--gold);
}

.page-about .tl-item > summary:hover .tl-title {
  color: var(--gold);
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .tl-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  line-height: 1.4;
  color: var(--brown);
  transition: color 160ms ease;
}

.page-about .tl-body {
  padding: 0 0 18px;
}

.page-about .tl-body p {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--brown);
}

/* 分栏与图片 */
.page-about .split {
  display: grid;
  gap: 24px;
}

.page-about .shot {
  margin: 0;
  border: 1px solid var(--about-rule);
  box-shadow: var(--about-shadow);
  background: var(--paper-2);
}

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

.page-about .shot figcaption {
  padding: 9px 12px;
  border-top: 1px solid var(--about-rule);
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

/* 02 团队分工 */
.page-about .duties {
  margin: 24px 0 0;
}

.page-about .duty {
  padding: 16px 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .duty:last-child {
  border-bottom: 1px solid var(--about-rule);
}

.page-about .duty__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .duty__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  color: var(--brown);
}

.page-about .duty__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--gold);
}

.page-about .duty__bar {
  height: 8px;
  margin: 10px 0 8px;
  background: rgba(36, 30, 26, 0.1);
  border-radius: 1px;
  overflow: hidden;
}

.page-about .duty__bar span {
  display: block;
  height: 100%;
  background: var(--gold);
  transition: width 300ms ease, background-color 200ms ease;
}

.page-about .duty--a .duty__bar span { width: 39%; }
.page-about .duty--b .duty__bar span { width: 22%; }
.page-about .duty--c .duty__bar span { width: 25%; }
.page-about .duty--d .duty__bar span { width: 14%; }

.page-about .duty__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--brown);
  opacity: 0.84;
  transition: opacity 200ms ease;
}

/* 03 更新节奏 */
.page-about .rhythm {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
}

.page-about .rhythm li {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 12px;
  align-items: baseline;
  padding: 14px 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .rhythm li:last-child {
  border-bottom: 1px solid var(--about-rule);
}

.page-about .rhythm .tm {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--gold);
}

.page-about .rhythm .tx {
  font-size: 14px;
  line-height: 1.68;
  color: var(--brown);
}

/* 04 编辑准则 */
.page-about .principles {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .principle {
  padding: 22px 20px 20px;
  background: var(--paper-2);
  border: 1px solid var(--about-rule);
  box-shadow: var(--about-shadow);
}

.page-about .principle__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 40px;
  line-height: 1;
  color: rgba(36, 30, 26, 0.17);
}

.page-about .principle h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  line-height: 1.4;
  color: var(--brown);
}

.page-about .principle p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--brown);
}

.page-about .principle a {
  color: var(--brown);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
}

.page-about .principle a:hover {
  color: var(--gold);
}

/* 05 合作 */
.page-about .partners {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .partner {
  padding: 20px 18px;
  background: var(--paper);
  border: 1px solid var(--gold);
}

.page-about .partner__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  color: var(--gold);
}

.page-about .partner__label {
  display: block;
  margin-top: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  color: var(--brown);
}

.page-about .partner__desc {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.68;
  color: var(--brown);
  opacity: 0.86;
}

.page-about .steps {
  list-style: none;
  counter-reset: step;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .steps li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: baseline;
  padding: 12px 14px;
  background: var(--paper-2);
  border-left: 3px solid var(--gold);
  font-size: 14px;
  line-height: 1.68;
  color: var(--brown);
}

.page-about .steps li::before {
  counter-increment: step;
  content: "0" counter(step);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gold);
}

/* 结尾入口 */
.page-about .about-cta {
  margin-top: 40px;
  padding: 28px 22px;
  background: var(--ink);
  border-top: 3px solid var(--gold);
}

.page-about .about-cta h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 22px;
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 32em;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(247, 248, 246, 0.78);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

/* 平板及以上 */
@media (min-width: 720px) {
  .page-about .about-hero h1 {
    font-size: 44px;
  }

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

  .page-about .sec-head h2 {
    font-size: 26px;
  }

  .page-about .sec-head {
    margin-bottom: 20px;
  }

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

  .page-about .tl-item > summary {
    flex-wrap: nowrap;
  }

  .page-about .tl-title {
    font-size: 18px;
  }

  .page-about .principles,
  .page-about .partners {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .rhythm li {
    grid-template-columns: 132px 1fr;
  }

  .page-about .about-cta {
    padding: 36px 32px;
  }
}

/* 桌面 */
@media (min-width: 960px) {
  .page-about .about-hero {
    padding-top: 40px;
  }

  .page-about .about-hero h1 {
    font-size: 56px;
    max-width: 15em;
  }

  .page-about .about-sec {
    padding-top: 96px;
  }

  .page-about .about-timeline {
    margin-top: 56px;
    padding: 64px 0 56px;
  }

  .page-about .split {
    grid-template-columns: 5fr 6fr;
    gap: 48px;
    align-items: start;
  }

  .page-about .split--rev {
    grid-template-columns: 6fr 5fr;
  }

  .page-about .split--rev .split__body {
    order: 1;
  }

  .page-about .split--rev .shot {
    order: 2;
    margin-top: 8px;
  }

  .page-about .principles {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

  .page-about .partners {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .page-about .steps {
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
  }

  .page-about .about-cta {
    margin-top: 56px;
    display: grid;
    grid-template-columns: 6fr 5fr;
    align-items: center;
    gap: 32px;
  }

  .page-about .about-cta__actions {
    margin-top: 0;
    justify-content: flex-end;
  }
}

@media (hover: hover) and (pointer: fine) {
  .page-about .duty:hover .duty__bar span {
    background: var(--brown);
  }

  .page-about .duty:hover .duty__desc {
    opacity: 1;
  }

  .page-about .duty:hover .duty__num {
    color: var(--brown);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-item::before,
  .page-about .tl-title,
  .page-about .duty__bar span,
  .page-about .duty__desc {
    transition: none;
  }
}