.page-about {
  --about-narrow: 68ch;
  --about-gap: clamp(26px, 3.6vw, 52px);
  padding-block: clamp(20px, 3vw, 40px) clamp(48px, 6vw, 96px);
}

.page-about a {
  color: var(--gold);
  text-decoration-color: var(--clay);
  text-underline-offset: 3px;
}

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

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

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: 18px;
  padding: clamp(26px, 4vw, 60px) clamp(20px, 4vw, 64px) clamp(22px, 3vw, 40px);
  border: 1px solid var(--line);
  background:
    radial-gradient(120% 92% at 88% 0%, rgba(255, 138, 61, .20), transparent 58%),
    radial-gradient(90% 80% at 0% 100%, rgba(29, 44, 76, .55), transparent 62%),
    var(--ink-2);
  overflow: hidden;
}

.page-about .about-hero__ruler {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 12px;
  background:
    repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 28px);
  opacity: .7;
  pointer-events: none;
}

.page-about .about-hero__cross {
  position: absolute;
  width: 16px;
  height: 16px;
  pointer-events: none;
}

.page-about .about-hero__cross::before,
.page-about .about-hero__cross::after {
  content: "";
  position: absolute;
  background: var(--clay);
}

.page-about .about-hero__cross::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 1px;
}

.page-about .about-hero__cross::after {
  top: 0;
  left: 7px;
  width: 1px;
  height: 16px;
}

.page-about .about-hero__cross--tl {
  left: 14px;
  bottom: 14px;
}

.page-about .about-hero__cross--br {
  right: 14px;
  top: 26px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 18px;
  grid-template-columns: 1fr;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  max-width: 22ch;
  font-size: clamp(1.9rem, 4.4vw, 3.2rem);
  line-height: 1.14;
  color: var(--cream);
}

.page-about .about-hero__sub {
  margin: 0 0 14px;
  max-width: var(--about-narrow);
}

.page-about .about-hero__note {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--ash);
}

.page-about .about-hero__vertical {
  color: var(--clay);
  opacity: .85;
  letter-spacing: .3em;
}

/* ---------- 首屏数据刻度 ---------- */
.page-about .about-stats {
  display: grid;
  gap: 1px;
  margin: clamp(24px, 3vw, 40px) 0 0;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  background: var(--line-soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-stats__item {
  padding: 14px 12px;
  background: rgba(16, 14, 12, .72);
}

.page-about .about-stats__label {
  margin: 0 0 6px;
  font-size: 12px;
  color: var(--ash);
  letter-spacing: .04em;
}

.page-about .about-stats__value {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  color: var(--cream);
}

/* ---------- 首屏图 ---------- */
.page-about .about-hero__figure {
  margin: clamp(18px, 2.6vw, 30px) 0 0;
}

.page-about .about-hero__figure .media__caption,
.page-about .about-maintain__figure .media__caption,
.page-about .about-series__figure .media__caption {
  margin-top: 8px;
  font-family: var(--font-serif);
  font-size: 12.5px;
  color: var(--ash);
}

/* ---------- 两栏：章节目录 + 正文 ---------- */
.page-about .about-layout {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(34px, 5vw, 72px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-toc {
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.page-about .about-toc__title {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--clay);
}

.page-about .about-toc__list {
  display: flex;
  gap: 14px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc__link {
  display: inline-flex;
  gap: 7px;
  align-items: baseline;
  white-space: nowrap;
  padding: 5px 0;
  font-size: 13px;
  color: var(--text-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-toc__link .num {
  font-size: 11px;
  color: var(--ash);
}

.page-about .about-toc__link[aria-current="true"] {
  color: var(--lamp);
  border-bottom-color: var(--lamp);
}

.page-about .about-toc__link[aria-current="true"] .num {
  color: var(--lamp);
}

/* ---------- 章节通用 ---------- */
.page-about .about-body {
  min-width: 0;
}

.page-about .about-sec {
  padding-top: clamp(30px, 4vw, 56px);
  scroll-margin-top: calc(var(--head-top) + 24px);
}

.page-about .about-sec + .about-sec {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 18px;
}

.page-about .about-sec__idx {
  font-size: 13px;
  color: var(--clay);
  letter-spacing: .06em;
}

.page-about .about-sec__title {
  margin: 0;
  font-size: clamp(1.3rem, 2.4vw, 1.9rem);
  line-height: 1.25;
  color: var(--cream);
}

.page-about .about-sec__lead {
  max-width: var(--about-narrow);
  margin: 0 0 22px;
  color: var(--text-soft);
}

.page-about .about-sec .prose {
  max-width: var(--about-narrow);
}

.page-about .about-sec .prose p {
  margin: 0 0 1.1em;
  color: var(--text-soft);
}

/* ---------- 服务对象 ---------- */
.page-about .about-audience {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-audience__item {
  display: grid;
  gap: 6px 16px;
  grid-template-columns: auto minmax(0, 1fr);
  padding: 20px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-audience__idx {
  grid-row: span 2;
  font-size: 13px;
  color: var(--stand);
  background: var(--cream);
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
}

.page-about .about-audience__item:nth-child(2) .about-audience__idx {
  background: var(--lamp);
  color: var(--ink);
}

.page-about .about-audience__item:nth-child(3) .about-audience__idx {
  background: var(--turf);
  color: var(--cream);
}

.page-about .about-audience__name {
  margin: 0;
  font-size: 1.05rem;
  color: var(--cream);
}

.page-about .about-audience__desc {
  margin: 0;
  max-width: var(--about-narrow);
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-soft);
}

/* ---------- 价值主张 ---------- */
.page-about .about-claims {
  display: grid;
  gap: 26px;
}

.page-about .about-claim {
  padding: 4px 0 4px 20px;
  border-left: 3px solid var(--clay);
}

.page-about .about-claim__title {
  margin: 0 0 10px;
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  color: var(--cream);
}

.page-about .about-claim__scene {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: 13.5px;
  color: var(--gold);
}

.page-about .about-claim__result {
  margin: 0;
  max-width: var(--about-narrow);
  color: var(--text-soft);
  line-height: 1.75;
}

/* ---------- 内容维护 ---------- */
.page-about .about-maintain {
  margin-bottom: 26px;
}

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

.page-about .about-duties {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  grid-template-columns: minmax(0, 1fr);
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-duties__item {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  background: var(--ink-2);
}

.page-about .about-duties__name {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--lamp);
}

.page-about .about-duties__desc {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text-soft);
}

/* ---------- 赛季专题 ---------- */
.page-about .about-series {
  align-items: start;
}

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

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  display: flex;
  gap: 0;
  margin: 0;
  padding: 0 0 14px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-step {
  position: relative;
  flex: 0 0 84%;
  max-width: 340px;
  padding: 30px 22px 6px 0;
  scroll-snap-align: start;
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  top: 10px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--line);
}

.page-about .about-step__node {
  position: absolute;
  top: 4px;
  left: 0;
  width: 13px;
  height: 13px;
  border: 1px solid var(--clay);
  background: var(--ink);
  transform: rotate(45deg);
}

.page-about .about-step:nth-child(2) .about-step__node {
  border-color: var(--lamp);
  background: var(--lamp);
}

.page-about .about-step:nth-child(3) .about-step__node {
  border-color: var(--turf);
  background: var(--turf);
}

.page-about .about-step__phase {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--clay);
}

.page-about .about-step__name {
  margin: 0 0 8px;
  font-size: 1.05rem;
  color: var(--cream);
}

.page-about .about-step__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text-soft);
}

/* ---------- 去向 ---------- */
.page-about .about-next {
  margin-top: clamp(34px, 4.5vw, 64px);
  padding: clamp(22px, 3vw, 36px);
  border: 1px solid var(--line);
  background:
    linear-gradient(135deg, rgba(184, 67, 42, .16), transparent 46%),
    var(--ink-2);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.page-about .about-next__title {
  margin: 0 0 20px;
  font-size: clamp(1.15rem, 2.2vw, 1.55rem);
  color: var(--cream);
}

.page-about .about-next__links {
  display: grid;
  gap: 1px;
  grid-template-columns: minmax(0, 1fr);
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-next__link {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  background: rgba(16, 14, 12, .86);
  text-decoration: none;
  transition: background .2s var(--ease);
}

.page-about .about-next__link:hover {
  background: rgba(29, 44, 76, .55);
}

.page-about .about-next__link-label {
  font-size: 15px;
  font-weight: 700;
  color: var(--lamp);
}

.page-about .about-next__link-desc {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--text-soft);
}

/* ---------- 返回顶部 ---------- */
.page-about .about-totop {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 12;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 10px 15px;
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--ink);
  background: var(--lamp);
  border: 1px solid var(--lamp);
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity .2s var(--ease), transform .2s var(--ease);
}

.page-about .about-totop[data-visible] {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.page-about .about-totop:focus-visible {
  outline: 2px solid var(--turf);
  outline-offset: 3px;
}

.page-about .about-totop__arrow {
  font-family: var(--font-mono);
  font-size: 14px;
}

/* ---------- 窄屏保底 ---------- */
@media (max-width: 560px) {
  .page-about .about-stats {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-hero__title {
    max-width: none;
  }
}

/* ---------- 桌面端 ---------- */
@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-hero__vertical {
    justify-self: end;
    align-self: start;
  }

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

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

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

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: 208px minmax(0, 1fr);
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--head-top) + 22px);
    align-self: start;
    border-top: none;
    border-left: 1px solid var(--line);
    padding: 6px 0 6px 16px;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-toc__link {
    white-space: normal;
    padding: 7px 0;
  }

  .page-about .about-step {
    flex: 0 0 auto;
    width: 300px;
  }

  .page-about .about-claims {
    gap: 34px;
  }

  .page-about .about-sec__title {
    letter-spacing: -.02em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-totop,
  .page-about .about-toc__link,
  .page-about .about-next__link {
    transition: none;
    transform: none;
  }
}