.page-about {
  --about-axis: 88px;
  --about-ink-soft: #2B333D;
  background: var(--am-paper);
  color: var(--am-ink);
  font-family: var(--am-font-body);
}

/* ---------- 面包屑 ---------- */
.page-about .am-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 22px 0 0;
  font-family: var(--am-font-mono);
  font-size: 12px;
  letter-spacing: 0.09em;
  color: var(--am-slate);
}

.page-about .am-breadcrumb a {
  color: var(--am-slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--am-ease), border-color 0.2s var(--am-ease);
}

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

.page-about .am-breadcrumb__sep {
  color: var(--am-gold);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding: 26px 0 8px;
}

.page-about .about-hero__card {
  background: var(--am-white);
  padding: 30px 22px 34px;
  box-shadow: var(--am-shadow-s);
}

.page-about .about-hero__top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--am-line);
  margin-bottom: 26px;
}

.page-about .about-hero__since {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--am-slate);
}

.page-about .about-hero__title {
  font-family: var(--am-font-head);
  font-size: clamp(32px, 7.4vw, 56px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.01em;
  margin: 0 0 20px;
  max-width: 20em;
}

.page-about .about-hero__mark {
  position: relative;
  white-space: nowrap;
  color: var(--am-tile);
}

.page-about .about-hero__mark::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.06em;
  height: 3px;
  background: var(--am-gold);
  opacity: 0.55;
}

.page-about .about-hero__lead {
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-ink-soft);
  margin: 0;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 32px 0 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--am-line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 14px;
}

.page-about .about-hero__facts strong {
  display: block;
  font-family: var(--am-font-mono);
  font-size: 24px;
  font-weight: 600;
  line-height: 1.2;
  color: var(--am-tile);
}

.page-about .about-hero__facts span {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--am-slate);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: 56px 0 12px;
}

.page-about .about-chapter--mist {
  background: var(--am-mist);
  border-top: 1px solid var(--am-line);
  border-bottom: 1px solid var(--am-line);
  padding-bottom: 48px;
  margin-bottom: 8px;
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-chapter__axis {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .about-chapter__axis::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--am-gold);
}

.page-about .about-chapter__dot {
  display: none;
}

.page-about .about-chapter__no {
  font-family: var(--am-font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--am-gold);
}

.page-about .about-chapter__body > .am-h2 {
  font-family: var(--am-font-head);
  font-size: clamp(24px, 4.6vw, 36px);
  line-height: 1.3;
  margin: 0 0 18px;
  max-width: 22em;
}

.page-about .about-chapter__lead {
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-ink-soft);
  margin: 0 0 6px;
}

.page-about .about-chapter .am-text {
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--about-ink-soft);
  margin: 0 0 14px;
}

.page-about .about-chapter .am-text:last-child {
  margin-bottom: 0;
}

/* ---------- 图文错位 ---------- */
.page-about .about-chapter__split {
  display: grid;
  gap: 24px;
  margin-top: 22px;
}

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

.page-about .about-figure--wide {
  margin-top: 26px;
  margin-bottom: 6px;
}

.page-about .about-figure__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  background: linear-gradient(135deg, var(--am-mist) 0%, var(--am-paper) 100%);
  border: 1px solid var(--am-line);
  box-shadow: var(--am-shadow-s);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--am-font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  line-height: 1.6;
  color: var(--am-slate);
}

.page-about .about-chapter__copy .am-text:first-child {
  font-size: 17px;
  color: var(--am-ink);
}

/* ---------- 团队分工 ---------- */
.page-about .about-team {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-team__item {
  background: var(--am-white);
  border: 1px solid var(--am-line);
  border-top: 3px solid var(--am-tile);
  padding: 22px 18px 24px;
  transition: transform 0.28s var(--am-ease), box-shadow 0.28s var(--am-ease),
    border-top-color 0.28s var(--am-ease);
}

.page-about .about-team__item:hover {
  transform: translateY(-4px);
  box-shadow: var(--am-shadow-m);
  border-top-color: var(--am-gold);
}

.page-about .about-team__no {
  display: block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--am-gold);
  margin-bottom: 10px;
}

.page-about .about-team__item .am-h4 {
  font-family: var(--am-font-head);
  font-size: 20px;
  margin: 0 0 10px;
}

.page-about .about-team__item .am-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-rhythm {
  margin-top: 26px;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--am-line);
}

.page-about .about-rhythm__day {
  padding: 20px 0 22px;
  border-bottom: 1px solid var(--am-line);
}

.page-about .about-rhythm__label {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--am-white);
  background: var(--am-tile);
  padding: 4px 10px;
  margin-bottom: 12px;
}

.page-about .about-rhythm__day--alt .about-rhythm__label {
  background: var(--am-gold);
  color: var(--am-ink);
}

.page-about .about-rhythm__day p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .about-linkline {
  margin: 26px 0 0;
}

/* ---------- 服务对象 ---------- */
.page-about .about-scope {
  margin-top: 20px;
  display: grid;
  gap: 22px;
}

.page-about .about-scope__col {
  background: var(--am-white);
  border-left: 3px solid var(--am-gold);
  padding: 20px 18px 22px;
}

.page-about .about-scope__col .am-h3 {
  font-family: var(--am-font-head);
  font-size: 19px;
  margin: 0 0 10px;
}

.page-about .about-scope__col .am-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .about-note {
  margin: 24px 0 0;
  padding: 16px 18px;
  background: var(--am-white);
  border: 1px dashed var(--am-line-strong);
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

/* ---------- 时间轴 ---------- */
.page-about .about-tl {
  list-style: none;
  margin: 30px 0 0;
  padding: 0 0 0 30px;
  position: relative;
  display: grid;
  gap: 4px;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 16px;
  bottom: 16px;
  width: 1px;
  background: linear-gradient(
    180deg,
    var(--am-tile) 0%,
    var(--am-gold) 55%,
    var(--am-coral) 100%
  );
}

.page-about .about-tl__item {
  position: relative;
  padding: 12px 0 14px;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 22px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--am-white);
  border: 2px solid var(--am-gold);
  transition: background 0.26s var(--am-ease), transform 0.26s var(--am-ease);
}

.page-about .about-tl__item:hover::before,
.page-about .about-tl__item:focus-within::before {
  background: var(--am-gold);
  transform: scale(1.2);
}

.page-about .about-tl__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  outline: none;
}

.page-about .about-tl__head:focus-visible {
  outline: 1px dashed var(--am-tile);
  outline-offset: 4px;
}

.page-about .about-tl__year {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--am-tile);
}

.page-about .about-tl__title {
  font-family: var(--am-font-head);
  font-size: 19px;
  margin: 0;
}

.page-about .about-tl__note {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-ink-soft);
  transition: max-height 0.36s var(--am-ease), opacity 0.3s var(--am-ease),
    margin-top 0.3s var(--am-ease);
}

.page-about .about-tl__item:hover .about-tl__note,
.page-about .about-tl__item:focus-within .about-tl__note {
  max-height: 200px;
  opacity: 1;
  margin-top: 8px;
}

/* ---------- 瓷砖装饰带 ---------- */
.page-about .about-tile {
  height: 16px;
  margin: 40px 0 0;
  background-image: linear-gradient(135deg, var(--am-tile) 25%, transparent 25%),
    linear-gradient(225deg, var(--am-tile) 25%, transparent 25%),
    linear-gradient(45deg, var(--am-tile) 25%, transparent 25%),
    linear-gradient(315deg, var(--am-tile) 25%, transparent 25%);
  background-size: 16px 16px;
  background-position: 0 0, 8px 0, 8px -8px, 0 8px;
  opacity: 0.22;
}

/* ---------- 结尾引导 ---------- */
.page-about .about-cta {
  background: var(--am-deep);
  padding: 52px 0 56px;
}

.page-about .about-cta__inner {
  display: grid;
  gap: 26px;
}

.page-about .about-cta .am-h2 {
  font-family: var(--am-font-head);
  font-size: clamp(23px, 4.4vw, 32px);
  line-height: 1.32;
  color: var(--am-white);
  margin: 0 0 14px;
}

.page-about .about-cta .am-text {
  max-width: 56ch;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(244, 241, 234, 0.76);
}

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

/* ---------- 平板与桌面 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__card {
    padding: 40px 36px 44px;
  }

  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px 18px;
  }

  .page-about .about-rhythm__day {
    display: grid;
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 8px 20px;
    align-items: start;
  }

  .page-about .about-rhythm__label {
    margin-bottom: 0;
    text-align: center;
  }

  .page-about .about-scope {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

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

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 32px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 34px 0 14px;
  }

  .page-about .about-chapter {
    padding: 78px 0 16px;
  }

  .page-about .about-chapter--mist {
    padding-bottom: 66px;
  }

  .page-about .about-chapter__grid {
    grid-template-columns: var(--about-axis) minmax(0, 1fr);
    gap: 0 34px;
  }

  .page-about .about-chapter__axis {
    display: block;
    position: relative;
    border-right: 1px solid var(--am-line);
    padding: 6px 22px 0 0;
    text-align: right;
    min-height: 100%;
  }

  .page-about .about-chapter__axis::before {
    display: none;
  }

  .page-about .about-chapter__no {
    display: block;
    font-size: 13px;
  }

  .page-about .about-chapter__dot {
    display: block;
    position: absolute;
    top: 11px;
    right: -4px;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--am-gold);
    box-shadow: 0 0 0 3px var(--am-paper);
  }

  .page-about .about-chapter--mist .about-chapter__dot {
    box-shadow: 0 0 0 3px var(--am-mist);
  }

  .page-about .about-chapter__split {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-chapter__split .about-figure {
    margin-top: 6px;
  }

  .page-about .about-chapter__copy {
    padding-top: 4px;
  }

  .page-about .about-tl {
    padding-left: 34px;
  }

  .page-about .about-tl__item::before {
    left: -34px;
  }

  .page-about .about-cta {
    padding: 64px 0 68px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__card {
    padding: 48px 52px 52px;
  }

  .page-about .about-chapter__split {
    gap: 56px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__item,
  .page-about .about-tl__item::before,
  .page-about .about-tl__note {
    transition: none;
  }
}