/* ===== DOU体育 品牌档案页 · 专属样式 ===== */
.page-about {
  position: relative;
  background-color: var(--c-ink);
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 32px 32px;
  color: var(--c-paper);
  overflow-x: hidden;
}

/* 页面上下文提示条 */
.about-contextbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  max-width: var(--w-container);
  margin: 0 auto;
  padding: 16px var(--pad-mobile) 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.page-about .breadcrumbs {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--c-gray);
}

.page-about .breadcrumbs a {
  color: var(--c-paper);
  text-decoration: none;
  transition: color var(--speed) var(--ease-out);
}

.page-about .breadcrumbs a:hover {
  color: var(--c-orange);
}

.page-about .breadcrumbs__sep {
  margin: 0 6px;
  color: var(--c-gray);
}

.about-contextbar__code {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--c-gray);
}

/* ========== 首屏封面 ========== */
.about-cover {
  display: flex;
  flex-direction: column;
  gap: 32px;
  max-width: var(--w-container);
  margin: 0 auto;
  padding: 48px var(--pad-mobile) 72px;
}

.about-cover__spine {
  display: flex;
  align-items: center;
  gap: 16px;
  writing-mode: horizontal-tb;
  border-left: 3px solid var(--c-orange);
  padding-left: 12px;
  height: auto;
}

.about-cover__spine-main {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.24em;
  color: var(--c-paper);
  white-space: nowrap;
}

.about-cover__spine-sub {
  font-family: var(--font-data);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--c-gray);
}

.about-cover__main {
  position: relative;
  z-index: 2;
}

.about-cover__kicker {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--c-orange);
  margin: 0 0 12px;
}

.about-cover__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(42px, 10vw, 108px);
  font-weight: 400;
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--c-paper);
}

.about-cover__subtitle {
  margin: 14px 0 0;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 300;
  letter-spacing: 0.18em;
  color: var(--c-white-glass);
}

.about-cover__lead {
  margin: 24px 0 0;
  max-width: 46em;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.9;
  color: var(--c-line);
}

.about-cover__facts {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.about-cover__facts li {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-paper);
  background: var(--c-space);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 8px 14px;
  border-radius: 999px;
}

.about-cover__facts strong {
  color: var(--c-lime);
  font-size: 14px;
  margin-right: 2px;
}

.about-cover__visual {
  position: relative;
  width: 100%;
  margin-top: 8px;
}

.about-cover__img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 4px;
  filter: grayscale(1) contrast(1.2);
  background: var(--c-space);
}

.about-cover__stamp {
  position: absolute;
  right: 16px;
  bottom: 16px;
  display: flex;
  align-items: stretch;
  gap: 10px;
  background: var(--c-white-glass);
  backdrop-filter: blur(8px);
  padding: 12px 16px;
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 4px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.24);
}

.about-cover__stamp-num {
  font-family: var(--font-data);
  font-size: 36px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-ink);
}

.about-cover__stamp-label {
  font-family: var(--font-body);
  font-size: 12px;
  line-height: 1.4;
  letter-spacing: 0.08em;
  color: var(--c-ink);
  border-left: 1px solid rgba(10, 12, 14, 0.2);
  padding-left: 10px;
}

/* ========== 本册索引 ========== */
.about-toc {
  max-width: var(--w-container);
  margin: 0 auto;
  padding: 56px var(--pad-mobile) 64px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.about-toc__head {
  margin-bottom: 28px;
}

.about-toc__kicker {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--c-orange);
}

.about-toc__title {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 4vw, 42px);
  font-weight: 400;
  color: var(--c-paper);
}

.about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.about-toc__item {
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.about-toc__item a {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 4px;
  text-decoration: none;
  font-family: var(--font-body);
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--c-paper);
  transition: color var(--speed) var(--ease-out), padding-left var(--speed) var(--ease-out);
}

.about-toc__item a:hover {
  color: var(--c-orange);
  padding-left: 12px;
}

.about-toc__num {
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--c-orange);
}

.about-toc__links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 28px;
}

.about-toc__link {
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--c-lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 255, 61, 0.4);
  padding-bottom: 2px;
  transition: border-color var(--speed) var(--ease-out);
}

.about-toc__link:hover {
  border-color: var(--c-lime);
}

/* ========== 通用章节 ========== */
.about-chapter {
  padding: 72px var(--pad-mobile) 88px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  scroll-margin-top: 80px;
}

.about-chapter--alt {
  background-color: var(--c-paper);
  background-image:
    linear-gradient(rgba(10, 12, 14, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(10, 12, 14, 0.04) 1px, transparent 1px);
  background-size: 32px 32px;
  color: var(--c-ink);
  border-top: 1px solid var(--c-line);
}

.about-chapter__index {
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.about-chapter__num {
  font-family: var(--font-data);
  font-size: 48px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-orange);
  letter-spacing: -0.04em;
}

.about-chapter--alt .about-chapter__num {
  color: var(--c-orange);
}

.about-chapter__axis {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--c-gray);
  text-transform: uppercase;
  padding-bottom: 4px;
  border-bottom: 2px solid currentColor;
}

.about-chapter--alt .about-chapter__axis {
  color: var(--c-gray);
}

.about-chapter__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-size: clamp(28px, 5vw, 52px);
  font-weight: 400;
  line-height: 1.12;
  color: var(--c-paper);
}

.about-chapter--alt .about-chapter__title {
  color: var(--c-ink);
}

.about-chapter__intro {
  margin: 0 0 32px;
  max-width: 52em;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.9;
  color: var(--c-line);
}

.about-chapter--alt .about-chapter__intro {
  color: var(--c-gray);
}

.about-chapter__lede {
  margin: 0 0 20px;
  font-family: var(--font-body);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.8;
  color: var(--c-paper);
}

.about-chapter--alt .about-chapter__lede {
  color: var(--c-ink);
}

.about-chapter__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.about-chapter__body p {
  margin: 0 0 18px;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.9;
  color: var(--c-line);
}

.about-chapter--alt .about-chapter__body p {
  color: var(--c-gray);
}

.about-chapter__aside {
  display: flex;
  justify-content: flex-start;
}

.about-chapter__note {
  width: 100%;
  max-width: 280px;
  background: var(--c-black-glass);
  border: 1px solid rgba(255, 255, 255, 0.18);
  padding: 28px 24px;
  border-radius: 4px;
  position: relative;
}

.about-chapter--alt .about-chapter__note {
  background: var(--c-ink);
  border-color: rgba(255, 255, 255, 0.2);
}

.about-chapter__note-title {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--c-orange);
  margin-bottom: 18px;
  border-bottom: 1px solid var(--c-orange);
  padding-bottom: 4px;
}

.about-chapter__note p {
  margin: 0 0 18px;
  font-family: var(--font-body);
  font-size: 24px;
  font-weight: 300;
  line-height: 1.5;
  color: var(--c-paper);
}

.about-chapter__note-foot {
  font-family: var(--font-data);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--c-gray);
}

/* 章节被锚点定位时的高亮提示 */
.about-chapter:target {
  box-shadow: inset 4px 0 0 var(--c-orange);
}

/* ========== 数据体系 ========== */
.about-data-figure {
  margin: 28px 0 32px;
}

.about-data-figure img {
  display: block;
  width: 100%;
  height: auto;
  background: var(--c-space);
  border-radius: 4px;
  border: 1px solid rgba(10, 12, 14, 0.1);
}

.about-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin: 0 0 40px;
}

.about-metrics__item {
  background: var(--c-ink);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: transform var(--speed) var(--ease-out), box-shadow var(--speed) var(--ease-out);
}

.about-metrics__item:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(10, 12, 14, 0.3);
}

.about-metrics__num {
  font-family: var(--font-data);
  font-size: 36px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-lime);
}

.about-metrics__label {
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-paper);
  opacity: 0.85;
}

.about-indicators {
  border-top: 1px solid rgba(10, 12, 14, 0.14);
  padding-top: 28px;
}

.about-indicators__title {
  margin: 0 0 18px;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-space);
}

.about-indicators__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.about-indicators__list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--c-line);
  font-family: var(--font-body);
  font-size: 14px;
}

.about-indicators__list li span:first-child {
  font-weight: 600;
  color: var(--c-ink);
  flex-shrink: 0;
}

.about-indicators__list li span:last-child {
  color: var(--c-gray);
  text-align: right;
}

/* ========== 发展历程 ========== */
.about-inline-link {
  color: var(--c-orange);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 59, 20, 0.35);
  padding-bottom: 1px;
  transition: border-color var(--speed) var(--ease-out);
}

.about-inline-link:hover {
  border-color: var(--c-orange);
}

.about-chapter--alt .about-inline-link {
  color: var(--c-alert);
  border-bottom-color: rgba(255, 77, 90, 0.4);
}

.about-timeline {
  margin-top: 8px;
}

.about-timeline > img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 4px;
  background: var(--c-space);
}

.about-timeline__nodes {
  margin-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.about-timeline__node {
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.about-timeline__node summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 6px;
  transition: background-color var(--speed) var(--ease-out);
}

.about-timeline__node summary::-webkit-details-marker {
  display: none;
}

.about-timeline__node summary:hover {
  background: rgba(255, 255, 255, 0.04);
}

.about-timeline__dot {
  width: 10px;
  height: 10px;
  background: var(--c-lime);
  flex-shrink: 0;
  transition: box-shadow var(--speed) var(--ease-out);
}

.about-timeline__node summary:hover .about-timeline__dot {
  box-shadow: 0 0 0 6px rgba(198, 255, 61, 0.18);
}

.about-timeline__step {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-orange);
  flex-shrink: 0;
}

.about-timeline__label {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--c-paper);
}

.about-timeline__desc {
  margin: 0;
  padding: 0 24px 20px 44px;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-line);
}

/* ========== 本地服务 ========== */
.about-local {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

.about-local__subtitle {
  margin: 36px 0 14px;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-ink);
}

.about-local__main > p {
  margin: 0 0 16px;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.9;
  color: var(--c-gray);
}

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

.about-list li {
  position: relative;
  padding: 12px 0 12px 28px;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-ink);
  border-bottom: 1px dashed var(--c-line);
}

.about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  width: 8px;
  height: 8px;
  background: var(--c-orange);
}

.about-local__aside {
  display: flex;
  justify-content: flex-start;
}

.about-local-card {
  width: 100%;
  max-width: 360px;
  background: var(--c-ink);
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 24px 24px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 4px;
  padding: 28px 24px;
  box-shadow: 0 12px 28px rgba(10, 12, 14, 0.26);
}

.about-local-card__label {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--c-orange);
  border-bottom: 1px solid var(--c-orange);
  padding-bottom: 4px;
  margin-bottom: 20px;
}

.about-local-card__list {
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  gap: 14px;
}

.about-local-card__list div {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 10px;
  align-items: baseline;
}

.about-local-card__list dt {
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 700;
  color: var(--c-lime);
}

.about-local-card__list dd {
  margin: 0;
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.5;
  color: var(--c-line);
}

.about-local-card__status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-paper);
  background: rgba(198, 255, 61, 0.1);
  border: 1px solid rgba(198, 255, 61, 0.3);
  padding: 6px 12px;
  border-radius: 999px;
}

/* ========== 数据审核与标准 ========== */
.about-steps {
  list-style: none;
  margin: 32px 0 44px;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.about-steps__item {
  display: flex;
  gap: 20px;
  background: var(--c-space);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  padding: 24px 22px;
  transition: transform var(--speed) var(--ease-out), border-color var(--speed) var(--ease-out);
}

.about-steps__item:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 59, 20, 0.5);
}

.about-steps__num {
  font-family: var(--font-data);
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-orange);
  flex-shrink: 0;
}

.about-steps__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--c-paper);
}

.about-steps__body p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-line);
}

.about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 32px;
}

.about-team__info h3 {
  margin: 0 0 10px;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-paper);
}

.about-team__info p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.9;
  color: var(--c-line);
}

.about-team__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.page-about .btn--outline {
  border: 1px solid rgba(255, 255, 255, 0.35);
  color: var(--c-paper);
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0.08em;
  padding: 10px 18px;
  border-radius: 2px;
  text-decoration: none;
  transition: border-color var(--speed) var(--ease-out), color var(--speed) var(--ease-out), background-color var(--speed) var(--ease-out);
}

.page-about .btn--outline:hover {
  border-color: var(--c-orange);
  color: var(--c-orange);
  background: rgba(255, 59, 20, 0.06);
}

/* ========== 响应式：平板 ========== */
@media (min-width: 640px) {
  .about-cover {
    padding: 64px var(--pad-tablet) 88px;
  }

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

  .about-indicators__list {
    grid-template-columns: 1fr 1fr;
    column-gap: 32px;
  }

  .about-toc__head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
  }

  .about-steps {
    grid-template-columns: 1fr 1fr;
  }

  .about-team {
    grid-template-columns: 1fr auto;
    align-items: start;
  }
}

/* ========== 响应式：桌面 ========== */
@media (min-width: 1024px) {
  .page-about {
    background-size: 40px 40px;
  }

  .about-contextbar {
    padding: 18px var(--pad-desktop) 16px;
  }

  .about-cover {
    display: grid;
    grid-template-columns: 90px minmax(0, 1.05fr) minmax(0, 0.95fr);
    grid-template-areas: "spine main visual";
    gap: 0 40px;
    align-items: start;
    padding: 72px var(--pad-desktop) 96px;
  }

  .about-cover__spine {
    grid-area: spine;
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    display: flex;
    align-items: center;
    gap: 18px;
    border-left: none;
    border-right: 3px solid var(--c-orange);
    padding-left: 0;
    padding-right: 12px;
    height: 100%;
    justify-content: center;
  }

  .about-cover__spine-main {
    font-size: 14px;
    letter-spacing: 0.32em;
  }

  .about-cover__spine-sub {
    font-size: 10px;
  }

  .about-cover__main {
    grid-area: main;
    padding-top: 12px;
  }

  .about-cover__title {
    font-size: clamp(60px, 7vw, 108px);
  }

  .about-cover__visual {
    grid-area: visual;
    margin-top: 40px;
  }

  .about-cover__img {
    border-radius: 6px;
  }

  .about-toc {
    padding: 72px var(--pad-desktop) 88px;
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 60px;
  }

  .about-toc__head {
    display: block;
    margin-bottom: 0;
  }

  .about-toc__list {
    border-top: none;
  }

  .about-chapter {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 0 48px;
    padding: 96px var(--pad-desktop) 112px;
  }

  .about-chapter__index {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding-top: 8px;
    margin-bottom: 0;
  }

  .about-chapter__num {
    font-size: 72px;
  }

  .about-chapter__axis {
    padding-bottom: 6px;
  }

  .about-chapter__title {
    font-size: clamp(34px, 4.4vw, 56px);
  }

  .about-chapter__grid {
    grid-template-columns: 1fr 300px;
    gap: 48px;
  }

  .about-chapter__note {
    position: sticky;
    top: 120px;
  }

  .about-timeline__nodes {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0;
    border-top: none;
    margin-top: 36px;
  }

  .about-timeline__node {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    border-bottom: none;
    border-right: 1px solid rgba(255, 255, 255, 0.1);
    padding: 0;
  }

  .about-timeline__node:first-child {
    border-left: 1px solid rgba(255, 255, 255, 0.1);
  }

  .about-timeline__node summary {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding: 20px 18px;
    min-height: 130px;
  }

  .about-timeline__desc {
    padding: 0 18px 20px;
  }

  .about-local {
    grid-template-columns: 1fr 340px;
    gap: 60px;
    align-items: start;
  }

  .about-local__aside {
    position: sticky;
    top: 120px;
  }

  .about-steps {
    gap: 18px;
  }

  .about-steps__item {
    padding: 28px 26px;
  }

  .about-steps__num {
    font-size: 40px;
  }
}