.page-about {
  --about-notch: 14px;
  --about-notch-sm: 11px;
  background: var(--sb-cream);
  color: var(--sb-ink);
  font-family: var(--sb-font);
  overflow-x: clip;
}

/* ---------- 首屏拼贴 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 4vw, 40px) 0 clamp(28px, 5vw, 56px);
  background:
    radial-gradient(130% 80% at 96% 4%, rgba(200, 145, 43, 0.2), transparent 62%),
    linear-gradient(180deg, var(--sb-cream) 0%, var(--sb-cream) 100%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(20px, 4vw, 40px);
}

.page-about .about-hero__media {
  margin: 0;
  border-bottom: 6px solid var(--sb-red);
}

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

.page-about .about-hero__body {
  display: flex;
  flex-direction: column;
  gap: clamp(12px, 2vw, 18px);
}

.page-about .about-hero__body .sb-breadcrumb {
  font-size: 13px;
  letter-spacing: 0.01em;
  color: var(--sb-indigo-mid);
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.page-about .about-hero__body .sb-breadcrumb a {
  color: var(--sb-indigo-mid);
  text-decoration: none;
  border-bottom: 1px solid var(--sb-gold-soft);
}

.page-about .about-hero__body .sb-breadcrumb a:hover {
  color: var(--sb-red);
  border-bottom-color: var(--sb-red);
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(8px, 2vw, 18px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--sb-gold-soft);
  border: 1px solid var(--sb-gold-soft);
}

.page-about .about-facts__item {
  background: var(--sb-cream);
  padding: 14px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-facts__k {
  font-family: var(--sb-font-num);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--sb-red);
}

.page-about .about-facts__v {
  font-size: 14px;
  line-height: 1.45;
  color: var(--sb-indigo);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: stretch;
  }

  .page-about .about-hero__media {
    height: 100%;
  }

  .page-about .about-hero__media img {
    height: 100%;
    aspect-ratio: 8 / 11;
  }

  .page-about .about-hero__body {
    justify-content: center;
  }
}

/* ---------- 分屏骨架 ---------- */
.page-about .about-split {
  padding-block: clamp(36px, 6vw, 76px);
}

.page-about .sb-split {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

.page-about .sb-split__aside {
  min-width: 0;
}

.page-about .sb-split__main {
  min-width: 0;
}

/* 左侧纵向时间索引 */
.page-about .sb-index {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  padding: 4px 0 10px;
  border-bottom: 1px solid var(--sb-gold-soft);
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .sb-index::-webkit-scrollbar {
  display: none;
}

.page-about .sb-index__link {
  flex: 0 0 auto;
  padding: 8px 12px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--sb-indigo);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 3px solid transparent;
  transition: color 160ms var(--sb-ease), border-color 160ms var(--sb-ease);
}

.page-about .sb-index__link:hover {
  color: var(--sb-red);
}

.page-about .sb-index__link[data-active="true"] {
  color: var(--sb-red);
  font-weight: 700;
  border-bottom-color: var(--sb-red);
}

@media (min-width: 1024px) {
  .page-about .sb-split {
    grid-template-columns: 32% minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
  }

  .page-about .sb-split__aside {
    position: sticky;
    top: calc(var(--sb-head-h) + 28px);
    align-self: start;
  }

  .page-about .sb-index {
    flex-direction: column;
    overflow: visible;
    gap: 2px;
    padding: 6px 0 6px 0;
    border-bottom: 0;
    border-left: 1px solid var(--sb-cream-deep);
  }

  .page-about .sb-index__link {
    border-bottom: 0;
    border-left: 3px solid transparent;
    margin-left: -1px;
    padding: 10px 14px;
    white-space: normal;
  }

  .page-about .sb-index__link[data-active="true"] {
    border-left-color: var(--sb-red);
    background: linear-gradient(90deg, rgba(158, 43, 37, 0.07), transparent 80%);
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-block + .about-block {
  margin-top: clamp(44px, 7vw, 92px);
}

.page-about .about-block__head {
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .about-block__title {
  margin: 0;
  font-size: clamp(24px, 3.6vw, 34px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--sb-ink);
}

.page-about .about-block__title::after {
  content: "";
  display: block;
  width: 56px;
  height: 4px;
  margin-top: 12px;
  background: linear-gradient(90deg, var(--sb-red), var(--sb-gold));
}

.page-about .about-block .sb-prose p {
  max-width: 40em;
  margin: 0 0 1.1em;
  font-size: 17px;
  line-height: 1.75;
}

.page-about .about-block .sb-prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 改版时间线 ---------- */
.page-about .about-era-strip {
  margin: 0 0 20px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-notch)), calc(100% - var(--about-notch)) 100%, 0 100%);
  overflow: hidden;
  background: var(--sb-indigo);
}

.page-about .about-era-strip img {
  display: block;
  width: 100%;
  height: 120px;
  object-fit: cover;
}

.page-about .about-eras {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-era {
  position: relative;
  padding: 20px 20px 22px;
  background: var(--sb-cream-deep);
  border-left: 4px solid var(--sb-gold);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-notch)), calc(100% - var(--about-notch)) 100%, 0 100%);
}

.page-about .about-era__head {
  margin: 0 0 10px;
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}

.page-about .about-era__year {
  font-family: var(--sb-font-num);
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--sb-indigo);
}

.page-about .about-era__tag {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.01em;
  padding: 4px 10px;
  color: var(--sb-red-deep);
  background: var(--sb-gold-soft);
  white-space: nowrap;
}

.page-about .about-era__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.72;
  color: var(--sb-ink);
  max-width: 42em;
}

@media (min-width: 768px) {
  .page-about .about-eras {
    gap: 12px;
  }

  .page-about .about-era:nth-child(1) {
    margin-left: 0;
    padding-block: 20px;
  }

  .page-about .about-era:nth-child(2) {
    margin-left: 5%;
    padding-block: 26px;
  }

  .page-about .about-era:nth-child(3) {
    margin-left: 10%;
    padding-block: 32px;
  }

  .page-about .about-era:nth-child(4) {
    margin-left: 15%;
    padding-block: 38px;
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-team__media {
  margin: 0;
  border-bottom: 5px solid var(--sb-gold);
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-crew {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-crew__item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  font-size: 15px;
  font-weight: 500;
  color: var(--sb-indigo);
  background: var(--sb-cream-deep);
  border-left: 3px solid var(--sb-indigo-mid);
}

.page-about .about-crew__dot {
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  background: var(--sb-green);
}

@media (min-width: 860px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }
}

/* ---------- 服务准则 ---------- */
.page-about .about-rules {
  display: grid;
  gap: 14px;
}

.page-about .about-rule {
  position: relative;
  padding: 20px 20px 22px;
  background: var(--sb-cream-deep);
  border-top: 4px solid var(--sb-red);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-notch)), calc(100% - var(--about-notch)) 100%, 0 100%);
}

.page-about .about-rule__num {
  display: inline-block;
  font-family: var(--sb-font-num);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--sb-gold-ink);
  background: var(--sb-gold-soft);
  padding: 4px 10px 5px;
  margin-bottom: 12px;
}

.page-about .about-rule__title {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 900;
  line-height: 1.3;
  color: var(--sb-ink);
}

.page-about .about-rule__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--sb-ink);
}

@media (min-width: 640px) {
  .page-about .about-rules {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-about .about-rules {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
  }

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

/* ---------- 覆盖与规模 ---------- */
.page-about .about-reach {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
}

.page-about .about-bars {
  display: grid;
  gap: 18px;
}

.page-about .about-bar__head {
  margin: 0 0 8px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-bar__label {
  font-size: 15px;
  font-weight: 500;
  color: var(--sb-indigo);
}

.page-about .about-bar__val {
  font-family: var(--sb-font-num);
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  color: var(--sb-red);
}

.page-about .about-bar__track {
  position: relative;
  height: 12px;
  background: var(--sb-cream-deep);
  overflow: hidden;
}

.page-about .about-bar__fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: var(--pct, 0%);
  background: linear-gradient(90deg, var(--sb-indigo-mid), var(--sb-indigo));
}

.page-about .about-bar__fill::after {
  content: "";
  position: absolute;
  right: 0;
  top: -3px;
  bottom: -3px;
  width: 4px;
  background: var(--sb-green);
}

.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--sb-gold-soft);
  border: 1px solid var(--sb-gold-soft);
}

.page-about .about-stats__item {
  background: var(--sb-cream);
  padding: 14px 16px;
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-stats__num {
  font-family: var(--sb-font-num);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--sb-indigo);
  flex: 0 0 auto;
  min-width: 2.6em;
}

.page-about .about-stats__txt {
  font-size: 15px;
  line-height: 1.5;
  color: var(--sb-ink);
}

@media (min-width: 860px) {
  .page-about .about-reach {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

/* ---------- 常见误解 ---------- */
.page-about .about-block .sb-accordion {
  display: grid;
  gap: 10px;
}

.page-about .about-block .sb-accordion__item {
  background: var(--sb-cream-deep);
  border-left: 4px solid var(--sb-gold-soft);
  transition: border-color 200ms var(--sb-ease);
}

.page-about .about-block .sb-accordion__item[data-open="true"] {
  border-left-color: var(--sb-red);
}

.page-about .about-block .sb-accordion__trigger {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  background: none;
  border: 0;
  text-align: left;
  cursor: pointer;
  color: var(--sb-ink);
  font-family: inherit;
}

.page-about .about-block .sb-accordion__trigger:focus-visible {
  outline: 2px solid var(--sb-gold);
  outline-offset: -2px;
}

.page-about .about-block .sb-accordion__index {
  flex: 0 0 auto;
  font-family: var(--sb-font-num);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--sb-gold-ink);
  background: var(--sb-gold-soft);
  padding: 4px 9px 5px;
}

.page-about .about-block .sb-accordion__item[data-open="true"] .sb-accordion__index {
  color: var(--sb-indigo);
  background: var(--sb-gold);
}

.page-about .about-block .sb-accordion__title {
  flex: 1 1 auto;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
}

.page-about .about-block .sb-accordion__sign {
  flex: 0 0 auto;
  width: 12px;
  height: 12px;
  border-right: 2px solid var(--sb-red);
  border-bottom: 2px solid var(--sb-red);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform 200ms var(--sb-ease);
}

.page-about .about-block .sb-accordion__item[data-open="true"] .sb-accordion__sign {
  transform: rotate(225deg) translate(-2px, -2px);
}

.page-about .about-block .sb-accordion__panel {
  overflow: hidden;
}

.page-about .about-block .sb-accordion__body {
  padding: 0 18px 20px 66px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--sb-ink);
}

.page-about .about-block .sb-accordion__body p {
  margin: 0;
  max-width: 42em;
}

@media (max-width: 520px) {
  .page-about .about-block .sb-accordion__body {
    padding: 0 16px 18px 16px;
  }
}

/* ---------- 收尾 ---------- */
.page-about .about-next {
  padding-block: clamp(36px, 6vw, 76px) clamp(44px, 7vw, 88px);
  background: linear-gradient(180deg, var(--sb-cream) 0%, var(--sb-cream-deep) 100%);
}

.page-about .about-next__panel {
  padding: clamp(24px, 4vw, 44px);
}

.page-about .about-next__title {
  margin: 0 0 14px;
  font-size: clamp(22px, 3.2vw, 30px);
  font-weight: 900;
  line-height: 1.25;
  color: var(--sb-cream);
}

.page-about .about-next__text {
  margin: 0 0 24px;
  max-width: 44em;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(246, 240, 228, 0.86);
}

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

/* ---------- 降低动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .sb-index__link,
  .page-about .about-block .sb-accordion__sign,
  .page-about .about-block .sb-accordion__item {
    transition: none;
  }
}

.page-about {
  --pct: 1rem;
}