/* ============================================
   品牌档案 /culture/ —— 页面专属样式
   作用域：.page-about
   ============================================ */

.page-about {
  --ab-frame: 1px solid var(--line);
  --ab-measure: 40rem;
  --ab-hero: 156deg;
  position: relative;
  padding-bottom: 72px;
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  background-image:
    linear-gradient(rgba(200, 208, 204, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(200, 208, 204, 0.028) 1px, transparent 1px);
  background-size: 76px 76px;
}

.page-about * {
  box-sizing: border-box;
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: calc(var(--bar-h) + 30px);
  padding-bottom: 10px;
}

.page-about .about-hero__panel {
  position: relative;
  margin-top: 22px;
  padding: clamp(26px, 4.6vw, 50px) clamp(20px, 4vw, 46px) clamp(26px, 4vw, 44px);
  border: var(--ab-frame);
  border-left: 3px solid var(--cy);
  background: linear-gradient(
    var(--ab-hero),
    rgba(22, 68, 58, 0.58) 0%,
    rgba(15, 42, 36, 0.84) 54%,
    rgba(10, 15, 13, 0.95) 100%
  );
}

.page-about .about-hero__panel::after {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 34px;
  height: 34px;
  border-top: 2px solid var(--cy);
  border-right: 2px solid var(--cy);
  opacity: 0.6;
  pointer-events: none;
}

.page-about .about-hero__tag {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0;
  font-family: var(--font-label);
  font-size: 12.5px;
  letter-spacing: 0.16em;
  color: var(--cy);
}

.page-about .about-hero__tag::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--cy);
  clip-path: polygon(0 0, 100% 0, 100% 58%, 58% 100%, 0 100%);
}

.page-about .about-hero h1 {
  margin: 18px 0 20px;
  max-width: 22ch;
  font-family: var(--font-label);
  font-size: clamp(28px, 5vw, 50px);
  font-weight: 700;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 36rem;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(233, 240, 236, 0.78);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 38px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: var(--ab-frame);
}

.page-about .about-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 16px 14px 15px;
  background: rgba(10, 15, 13, 0.62);
}

.page-about .about-hero__num {
  font-family: var(--font-data);
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--cy);
  letter-spacing: -0.02em;
}

.page-about .about-hero__label {
  font-family: var(--font-label);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .about-hero__note {
  font-size: 12px;
  line-height: 1.6;
  color: var(--dusk);
}

/* ---------- 主体两栏 ---------- */

.page-about .about-body {
  margin-top: clamp(46px, 7vw, 88px);
}

.page-about .about-content {
  min-width: 0;
}

/* ---------- 章节索引 ---------- */

.page-about .about-index {
  margin-bottom: 44px;
  padding: 14px 0;
  border-top: var(--ab-frame);
  border-bottom: var(--ab-frame);
}

.page-about .about-index__label {
  margin: 0 0 10px;
  font-family: var(--font-label);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--dusk);
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__list::-webkit-scrollbar {
  height: 3px;
}

.page-about .about-index__list::-webkit-scrollbar-thumb {
  background: var(--line-strong);
}

.page-about .about-index__list a {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 8px 12px;
  border: 1px solid transparent;
  color: var(--dusk);
  text-decoration: none;
  transition:
    color 0.2s var(--ease),
    border-color 0.2s var(--ease),
    background-color 0.2s var(--ease),
    transform 0.2s var(--ease);
}

.page-about .about-index__list a:hover {
  color: var(--mist);
  border-color: var(--line);
}

.page-about .about-index__list a:focus-visible {
  outline: 2px solid var(--cy);
  outline-offset: 2px;
}

.page-about .about-index__list a[aria-current="location"] {
  color: var(--cy);
  border-color: rgba(37, 242, 198, 0.4);
  background: var(--cy-dim);
  transform: translateX(2px);
}

.page-about .about-index__num {
  flex: 0 0 auto;
  font-family: var(--font-data);
  font-size: 11.5px;
  color: var(--silver);
  opacity: 0.7;
}

.page-about .about-index__list a[aria-current="location"] .about-index__num {
  color: var(--cy);
  opacity: 1;
}

.page-about .about-index__name {
  font-family: var(--font-label);
  font-size: 13.5px;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.page-about .about-index__foot {
  display: none;
  margin: 16px 0 0;
  padding-top: 10px;
  border-top: var(--ab-frame);
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--dusk);
}

/* ---------- 章节 ---------- */

.page-about .about-sec {
  scroll-margin-top: calc(var(--bar-h) + 32px);
}

.page-about .about-sec__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: end;
  gap: 16px;
  margin-bottom: 12px;
}

.page-about .about-sec__num {
  font-family: var(--font-data);
  font-size: clamp(34px, 6vw, 56px);
  font-weight: 700;
  line-height: 0.86;
  letter-spacing: -0.03em;
  color: var(--silver);
  -webkit-text-fill-color: transparent;
  -webkit-text-stroke: 1.5px var(--silver);
  opacity: 0.55;
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-chapter);
  font-size: clamp(21px, 3vw, 30px);
  font-weight: 600;
  line-height: 1.36;
  letter-spacing: 0.01em;
  color: var(--mist);
}

.page-about .about-sec__dial {
  margin: 14px 0 28px;
  padding-left: 12px;
  border-left: 2px solid var(--line-strong);
  font-family: var(--font-data);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--dusk);
}

.page-about .about-sec__text p {
  margin: 0 0 18px;
  max-width: var(--ab-measure);
  font-size: 16px;
  line-height: 1.9;
  color: rgba(233, 240, 236, 0.86);
}

.page-about .about-sec__text p:last-child {
  margin-bottom: 0;
}

.page-about .about-sec__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-about .about-inline {
  color: var(--cy);
  text-decoration: none;
  border-bottom: 1px solid rgba(37, 242, 198, 0.45);
  transition: border-color 0.2s var(--ease);
}

.page-about .about-inline:hover {
  border-bottom-color: var(--cy);
}

/* 战术纸米引文 */

.page-about .about-paper {
  max-width: var(--ab-measure);
  margin: 26px 0 0;
  padding: 22px 24px 20px;
  background: var(--paper);
  border-left: 3px solid var(--or);
  color: #1a251f;
  font-family: var(--font-chapter);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.8;
}

/* ---------- 斜线分隔 ---------- */

.page-about .slash-rule {
  height: 16px;
  margin: 68px 0;
  background-image: repeating-linear-gradient(
    45deg,
    var(--silver) 0 2px,
    transparent 2px 16px
  );
  opacity: 0.26;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 16%, #000 84%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 16%, #000 84%, transparent);
}

/* ---------- 下一章 ---------- */

.page-about .about-next {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  margin-top: 30px;
  padding: 10px 17px;
  border: var(--ab-frame);
  font-family: var(--font-label);
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--dusk);
  text-decoration: none;
  transition:
    color 0.2s var(--ease),
    border-color 0.2s var(--ease),
    background-color 0.2s var(--ease);
}

.page-about .about-next:hover,
.page-about .about-next:focus-visible {
  color: var(--cy);
  border-color: rgba(37, 242, 198, 0.45);
  background: var(--cy-dim);
}

.page-about .about-next__num {
  font-family: var(--font-data);
  color: var(--cy);
}

/* ---------- 赛季刻度条 ---------- */

.page-about .about-tl {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(148px, 1fr));
  gap: 1px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: var(--ab-frame);
}

.page-about .about-tl__item {
  background: rgba(10, 15, 13, 0.72);
}

.page-about .about-tl__sum {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 14px 13px;
  cursor: pointer;
  list-style: none;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-tl__sum::-webkit-details-marker {
  display: none;
}

.page-about .about-tl__sum::after {
  content: "+";
  font-family: var(--font-data);
  font-size: 14px;
  line-height: 1;
  color: var(--cy);
  opacity: 0.85;
}

.page-about .about-tl__entry[open] .about-tl__sum {
  background: var(--cy-dim);
}

.page-about .about-tl__entry[open] .about-tl__sum::after {
  content: "−";
}

.page-about .about-tl__year {
  font-family: var(--font-data);
  font-size: 14px;
  letter-spacing: -0.01em;
  color: var(--silver);
}

.page-about .about-tl__entry[open] .about-tl__year {
  color: var(--cy);
}

.page-about .about-tl__note {
  margin: 0;
  padding: 12px 13px 16px;
  border-top: var(--ab-frame);
  font-size: 13px;
  line-height: 1.75;
  color: var(--dusk);
}

/* ---------- 场馆字段 ---------- */

.page-about .about-fields {
  margin: 30px 0 0;
  padding: 0;
}

.page-about .about-fields__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 5px;
  padding: 16px 0;
  border-top: var(--ab-frame);
}

.page-about .about-fields__row:last-child {
  border-bottom: var(--ab-frame);
}

.page-about .about-fields dt {
  font-family: var(--font-label);
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--cy);
}

.page-about .about-fields dd {
  margin: 0;
  max-width: var(--ab-measure);
  font-size: 15px;
  line-height: 1.8;
  color: rgba(233, 240, 236, 0.8);
}

/* ---------- 三道流程 ---------- */

.page-about .about-steps {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: ab-step;
  display: grid;
  gap: 12px;
}

.page-about .about-steps li {
  position: relative;
  padding: 20px 20px 20px 64px;
  background: rgba(15, 42, 36, 0.72);
  border-left: 2px solid var(--cy);
  counter-increment: ab-step;
}

.page-about .about-steps li::before {
  content: counter(ab-step, decimal-leading-zero);
  position: absolute;
  top: 18px;
  left: 18px;
  font-family: var(--font-data);
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
  color: var(--cy);
  opacity: 0.8;
}

.page-about .about-steps h3 {
  margin: 0 0 6px;
  font-family: var(--font-label);
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-steps p {
  margin: 0;
  max-width: 34rem;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(233, 240, 236, 0.76);
}

.page-about .about-steps + .about-sec__text {
  margin-top: 24px;
}

.page-about .about-stamps {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 22px 0 24px;
}

/* ---------- 团队分组 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(212px, 1fr));
  gap: 1px;
  margin: 26px 0 24px;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: var(--ab-frame);
}

.page-about .about-team li {
  padding: 20px 18px;
  background: rgba(15, 42, 36, 0.5);
}

.page-about .about-team__name {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-label);
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--cy);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(233, 240, 236, 0.74);
}

/* ---------- 版本演进 ---------- */

.page-about .about-vers {
  margin: 28px 0 30px;
  padding: 0;
  list-style: none;
}

.page-about .about-vers__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 5px;
  padding: 18px 0;
  border-top: var(--ab-frame);
}

.page-about .about-vers__item:last-child {
  border-bottom: var(--ab-frame);
}

.page-about .about-vers__v {
  font-family: var(--font-data);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--mist);
  letter-spacing: -0.01em;
}

.page-about .about-vers__item--current .about-vers__v {
  color: var(--cy);
}

.page-about .about-vers__y {
  font-family: var(--font-data);
  font-size: 13px;
  color: var(--dusk);
}

.page-about .about-vers__d {
  max-width: var(--ab-measure);
  font-size: 15px;
  line-height: 1.8;
  color: rgba(233, 240, 236, 0.78);
}

/* ---------- 使用场景 ---------- */

.page-about .about-uses {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-uses__link {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px 16px;
  padding: 18px 20px;
  border: var(--ab-frame);
  border-left: 2px solid var(--ink-2);
  color: inherit;
  text-decoration: none;
  transition:
    border-color 0.22s var(--ease),
    background-color 0.22s var(--ease),
    transform 0.22s var(--ease);
}

.page-about .about-uses__link:hover,
.page-about .about-uses__link:focus-visible {
  border-left-color: var(--cy);
  background: rgba(22, 68, 58, 0.5);
  transform: translateY(-2px);
}

.page-about .about-uses__title {
  grid-column: 1;
  grid-row: 1;
  font-family: var(--font-label);
  font-size: 15px;
  letter-spacing: 0.05em;
  color: var(--mist);
}

.page-about .about-uses__desc {
  grid-column: 1 / -1;
  grid-row: 2;
  font-size: 14px;
  line-height: 1.75;
  color: var(--dusk);
}

.page-about .about-uses__go {
  grid-column: 2;
  grid-row: 1;
  font-family: var(--font-data);
  color: var(--cy);
}

/* ---------- 图片 ---------- */

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

.page-about .about-figure img,
.page-about .about-plate img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--ab-frame);
  filter: saturate(0.78) contrast(1.08) brightness(0.9);
}

.page-about figcaption {
  margin-top: 10px;
  padding-left: 10px;
  border-left: 2px solid var(--ink-2);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--dusk);
}

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

.page-about .about-plate--square {
  max-width: 560px;
  margin: 60px auto;
}

.page-about .about-plate--wide {
  margin: 56px 0 0;
}

/* ============================================
   响应式
   ============================================ */

@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-stats {
    margin-top: 44px;
  }

  .page-about .about-fields__row {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 22px;
    align-items: baseline;
    padding: 18px 0;
  }

  .page-about .about-vers__item {
    grid-template-columns: 92px 74px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
    padding: 18px 0;
  }

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

@media (min-width: 900px) {
  .page-about .about-sec__grid {
    grid-template-columns: minmax(0, 1fr) 288px;
    gap: 46px;
    align-items: start;
  }

  .page-about .about-figure--side img {
    max-height: 248px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    display: grid;
    grid-template-columns: 208px minmax(0, 1fr);
    column-gap: clamp(40px, 5vw, 78px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--bar-h) + 28px);
    margin-bottom: 0;
    padding: 16px 0 0;
    border-bottom: 0;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__list a {
    padding: 8px 10px;
    border: 0;
    border-left: 2px solid transparent;
  }

  .page-about .about-index__list a[aria-current="location"] {
    border-left-color: var(--cy);
    background: var(--cy-dim);
  }

  .page-about .about-index__name {
    white-space: normal;
  }

  .page-about .about-index__foot {
    display: block;
  }

  .page-about .about-sec__head {
    gap: 22px;
  }

  .page-about .slash-rule {
    margin: 84px 0;
  }
}

@media (min-width: 1280px) {
  .page-about .about-body {
    grid-template-columns: 232px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }

  .page-about .about-index__list a[aria-current="location"],
  .page-about .about-uses__link:hover,
  .page-about .about-uses__link:focus-visible {
    transform: none;
  }
}