.page-about {
  --about-hair: rgba(28, 93, 122, 0.42);
  --about-hair-soft: rgba(28, 93, 122, 0.24);
  --about-ink-soft: #4A6678;
  background: var(--deep);
  color: var(--ice);
  overflow-x: hidden;
}

/* ---------- 封面 ---------- */
.page-about .about-cover {
  position: relative;
  padding: calc(var(--header-h) + clamp(30px, 7vw, 78px)) 0 clamp(40px, 7vw, 88px);
  background:
    radial-gradient(120% 78% at 84% 0%, rgba(255, 107, 26, 0.16), transparent 60%),
    radial-gradient(90% 60% at 8% 100%, rgba(46, 196, 182, 0.10), transparent 62%),
    linear-gradient(180deg, var(--deep) 0%, var(--deep-2) 100%);
  overflow: hidden;
}

.page-about .about-cover__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line-faint) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-faint) 1px, transparent 1px);
  background-size: 84px 84px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 76%);
  pointer-events: none;
}

.page-about .about-cover__inner {
  position: relative;
}

.page-about .about-cover__top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 20px;
  margin-top: clamp(22px, 4vw, 38px);
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-about .about-cover__issue {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--steel);
}

.page-about .about-cover__title {
  margin: clamp(26px, 5vw, 48px) 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(36px, 8.6vw, 72px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--white);
  max-width: 15ch;
}

.page-about .about-cover__title-accent {
  position: relative;
  color: var(--accent);
}

.page-about .about-cover__title-accent::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.06em;
  height: 2px;
  background: var(--accent);
  opacity: 0.5;
}

.page-about .about-cover__lede-row {
  display: grid;
  gap: clamp(16px, 3vw, 26px);
  margin-top: clamp(26px, 4vw, 40px);
  max-width: 1120px;
}

.page-about .about-cover__lede {
  margin: 0;
  font-size: clamp(16px, 1.7vw, 19px);
  line-height: 1.75;
  color: var(--ice);
}

.page-about .about-cover__note {
  margin: 0;
  padding-left: 16px;
  border-left: 2px solid var(--caution);
  font-size: 14px;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .about-cover__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(34px, 6vw, 58px) 0 0;
  background: var(--line-faint);
  border: 1px solid var(--line-faint);
}

.page-about .about-cover__stat {
  background: rgba(8, 36, 58, 0.86);
  padding: 18px 16px;
}

.page-about .about-cover__stat-label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--steel);
}

.page-about .about-cover__stat-num {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(22px, 3.6vw, 30px);
  color: var(--white);
  letter-spacing: -0.01em;
}

/* ---------- 编辑部目录 ---------- */
.page-about .about-toc {
  margin-top: clamp(38px, 6vw, 64px);
  border-top: 1px solid var(--line);
  padding-top: 18px;
}

.page-about .about-toc__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--accent);
  text-transform: uppercase;
}

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

.page-about .about-toc__list li + li {
  border-top: 1px solid var(--line-faint);
}

.page-about .about-toc__list a {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 12px 4px;
  color: var(--ice);
  text-decoration: none;
  font-size: 15px;
  transition: color 0.2s var(--ease), padding-left 0.2s var(--ease);
}

.page-about .about-toc__list a .data-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--steel);
  letter-spacing: 0.1em;
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--accent);
  padding-left: 10px;
}

.page-about .about-toc__list a:hover .data-num {
  color: var(--accent);
}

/* ---------- 通用章节头部 ---------- */
.page-about .about-head {
  max-width: 760px;
}

.page-about .about-head__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--accent);
  text-transform: uppercase;
}

.page-about .about-head__eyebrow .data-num {
  color: var(--caution);
}

.page-about .about-head__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1.18;
  letter-spacing: -0.015em;
  color: var(--white);
}

.page-about .about-head__text {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--steel);
}

.page-about .about-head--ink .about-head__title {
  color: var(--ink);
}

.page-about .about-head--ink .about-head__text {
  color: var(--about-ink-soft);
}

/* ---------- 赛季时间轴 ---------- */
.page-about .about-timeline {
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-timeline .about-head__title {
  color: var(--ink);
}

.page-about .about-timeline .about-head__text {
  color: var(--about-ink-soft);
}

.page-about .about-timeline__figure {
  margin: clamp(28px, 5vw, 48px) 0 clamp(30px, 5vw, 52px);
}

.page-about .about-timeline__list {
  position: relative;
  margin: 0;
  padding: 0 0 0 clamp(18px, 5vw, 44px);
  list-style: none;
  display: grid;
  gap: 10px;
  border-left: 1px solid var(--about-hair);
}

.page-about .tl-node {
  position: relative;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: calc(-1 * clamp(18px, 5vw, 44px) - 4px);
  top: 22px;
  width: 7px;
  height: 7px;
  background: var(--paper);
  border: 1px solid var(--line);
  transform: rotate(45deg);
}

.page-about .tl-node__details {
  border-bottom: 1px solid var(--about-hair-soft);
}

.page-about .tl-node__details[open] {
  background: rgba(28, 93, 122, 0.05);
}

.page-about .tl-node__summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 14px;
  padding: 14px 12px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl-node__year {
  font-size: 17px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.02em;
}

.page-about .tl-node__label {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(15px, 2.2vw, 19px);
  line-height: 1.4;
  color: var(--ink);
}

.page-about .tl-node__toggle {
  position: relative;
  width: 16px;
  height: 16px;
  flex: none;
}

.page-about .tl-node__toggle::before,
.page-about .tl-node__toggle::after {
  content: "";
  position: absolute;
  background: var(--line);
  transition: transform 0.22s var(--ease), opacity 0.22s var(--ease);
}

.page-about .tl-node__toggle::before {
  left: 0;
  right: 0;
  top: 7px;
  height: 1.5px;
}

.page-about .tl-node__toggle::after {
  top: 0;
  bottom: 0;
  left: 7px;
  width: 1.5px;
}

.page-about .tl-node__details[open] .tl-node__toggle::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .tl-node__body {
  padding: 0 12px 20px;
}

.page-about .tl-node__body p {
  margin: 0 0 10px;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--about-ink-soft);
}

.page-about .tl-node__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--line);
}

/* ---------- 团队 ---------- */
.page-about .about-team__intro {
  align-items: end;
  gap: clamp(24px, 4vw, 48px);
}

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

.page-about .about-team__scope {
  margin-top: clamp(30px, 5vw, 52px);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 22px;
}

.page-about .about-role {
  position: relative;
  padding: 24px 22px 26px;
  background: var(--panel);
  border: 1px solid var(--line-faint);
  overflow: hidden;
}

.page-about .about-role::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 34px;
  height: 2px;
  background: var(--accent);
}

.page-about .about-role__num {
  margin: 0;
  font-size: clamp(38px, 6vw, 52px);
  font-weight: 700;
  line-height: 1;
  color: var(--accent);
  letter-spacing: -0.03em;
}

.page-about .about-role__name {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 20px;
  color: var(--white);
}

.page-about .about-role__desc {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--steel);
}

.page-about .about-role__list {
  margin: 18px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--line-faint);
  display: grid;
  gap: 9px;
}

.page-about .about-role__list li {
  position: relative;
  padding-left: 16px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ice);
}

.page-about .about-role__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 1px;
  background: var(--pitch);
}

.page-about [data-filtered-out] {
  display: none;
}

/* ---------- 判罚研究 ---------- */
.page-about .about-rules {
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-rules__grid {
  align-items: start;
  gap: clamp(28px, 4vw, 56px);
}

.page-about .about-rules__levels {
  display: grid;
  gap: 14px;
}

.page-about .about-level {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--white);
  border: 1px solid rgba(28, 93, 122, 0.2);
}

.page-about .about-level--warn {
  border-left: 4px solid var(--caution);
}

.page-about .about-level--out {
  border-left: 4px solid var(--accent);
}

.page-about .about-level__tag {
  display: inline-block;
  margin: 0;
}

.page-about .about-level__title {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 19px;
  color: var(--ink);
}

.page-about .about-level__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-ink-soft);
}

.page-about .about-level__note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed rgba(28, 93, 122, 0.28);
  font-size: 13px;
  line-height: 1.6;
  color: var(--line);
}

.page-about .about-rules__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(30px, 5vw, 48px) 0 0;
  background: rgba(28, 93, 122, 0.22);
  border: 1px solid rgba(28, 93, 122, 0.22);
}

.page-about .about-rules__stat {
  background: var(--paper);
  padding: 18px 16px;
}

.page-about .about-rules__stat dt {
  margin: 0;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--about-ink-soft);
}

.page-about .about-rules__stat dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(20px, 3vw, 26px);
  color: var(--accent);
}

/* ---------- 合作与荣誉 ---------- */
.page-about .about-partners__grid {
  gap: clamp(24px, 4vw, 52px);
  margin-top: clamp(28px, 5vw, 48px);
  align-items: start;
}

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

.page-about .about-partners__side {
  display: grid;
  gap: 16px;
}

.page-about .about-partner-row {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 18px;
  align-items: start;
  padding: 20px;
  background: var(--panel);
  border: 1px solid var(--line-faint);
  border-right: 2px solid var(--pitch);
}

.page-about .about-partner-row__num {
  margin: 0;
  font-size: clamp(30px, 5vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--pitch);
  letter-spacing: -0.03em;
}

.page-about .about-partner-row__name {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 17px;
  color: var(--white);
}

.page-about .about-partner-row__desc {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .about-honor {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line-faint);
  border: 1px solid var(--line-faint);
}

.page-about .about-honor__item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  background: rgba(8, 36, 58, 0.86);
}

.page-about .about-honor__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.5;
  color: var(--ice);
}

/* ---------- 服务规模 ---------- */
.page-about .about-scale {
  background: linear-gradient(180deg, var(--deep-2) 0%, var(--deep) 100%);
}

.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(30px, 5vw, 50px);
  background: var(--line-faint);
  border: 1px solid var(--line-faint);
}

.page-about .about-scale__cell {
  position: relative;
  background: var(--deep-2);
  padding: 22px 20px 24px;
}

.page-about .about-scale__cell::after {
  content: "";
  position: absolute;
  right: 14px;
  bottom: 14px;
  width: 10px;
  height: 10px;
  border-right: 1px solid var(--accent);
  border-bottom: 1px solid var(--accent);
  opacity: 0.7;
}

.page-about .about-scale__num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 4.6vw, 38px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-scale__label {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--accent);
}

.page-about .about-scale__desc {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .about-cta {
  display: grid;
  gap: 18px;
  margin-top: clamp(30px, 5vw, 50px);
  padding: clamp(22px, 4vw, 34px);
  background: rgba(255, 107, 26, 0.08);
  border: 1px solid rgba(255, 107, 26, 0.4);
  border-left: 4px solid var(--accent);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(20px, 3vw, 26px);
  line-height: 1.3;
  color: var(--white);
}

.page-about .about-cta__desc {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ice);
}

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

.page-about .about-scale__more {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .about-scale__more a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 107, 26, 0.45);
  padding-bottom: 1px;
}

.page-about .about-scale__more a:hover,
.page-about .about-scale__more a:focus-visible {
  border-bottom-color: var(--accent);
}

/* ---------- 图片与网格基础 ---------- */
.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-toc__list a:focus-visible,
.page-about .about-scale__more a:focus-visible,
.page-about .btn:focus-visible,
.page-about .filter-chip:focus-visible,
.page-about .tl-node__summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.page-about .tl-node__summary:focus-visible {
  outline-offset: -2px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .about-cover__stat {
    padding: 22px 20px;
  }

  .page-about .about-cover__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-rules__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-toc__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 28px;
  }

  .page-about .about-toc__list li + li {
    border-top: 1px solid var(--line-faint);
  }
}

@media (min-width: 900px) {
  .page-about .about-cover__title {
    line-height: 1.02;
  }

  .page-about .about-cover__lede-row {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-toc__list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0;
    column-gap: 0;
    border-top: 1px solid var(--line-soft);
  }

  .page-about .about-toc__list li + li {
    border-top: 0;
    border-left: 1px solid var(--line-faint);
  }

  .page-about .about-toc__list a {
    flex-direction: column;
    gap: 8px;
    padding: 16px 16px 18px;
    font-size: 14.5px;
  }

  .page-about .about-toc__list a:hover,
  .page-about .about-toc__list a:focus-visible {
    padding-left: 20px;
  }

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

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

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

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }

  .page-about .about-partners__grid {
    align-items: stretch;
  }

  .page-about .about-partners__side {
    align-content: start;
  }
}

@media (min-width: 1200px) {
  .page-about .about-scale__grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-scale__cell {
    padding: 26px 18px 30px;
  }

  .page-about .about-scale__num {
    font-size: 32px;
  }

  .page-about .about-scale__desc {
    font-size: 13px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__list a,
  .page-about .tl-node__toggle::before,
  .page-about .tl-node__toggle::after {
    transition: none;
  }
}