.page-about {
  --ab-rail: 200px;
  --ab-paper-line: rgba(30, 23, 18, 0.28);
  overflow-x: clip;
  background: var(--tb-deep);
  color: var(--tb-text);
}

/* ---------- 刊头 ---------- */
.page-about .ab-masthead {
  position: relative;
  padding: 42px 0 54px;
  background:
    radial-gradient(120% 90% at 86% 6%, rgba(47, 168, 79, 0.16), transparent 58%),
    linear-gradient(180deg, var(--tb-deep) 0%, var(--tb-ink) 100%);
  border-bottom: 1px solid var(--tb-line);
}

.page-about .ab-masthead::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(124, 147, 170, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124, 147, 170, 0.06) 1px, transparent 1px);
  background-size: 56px 56px;
  pointer-events: none;
}

.page-about .ab-masthead > .tb-container {
  position: relative;
}

.page-about .ab-masthead .tb-breadcrumb {
  margin-bottom: 26px;
}

.page-about .ab-masthead__grid {
  display: grid;
  gap: 32px;
}

.page-about .ab-title {
  margin: 14px 0 20px;
  font-family: var(--tb-font-display);
  font-weight: 900;
  font-size: 40px;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--tb-white);
}

.page-about .ab-masthead__lede .tb-lede {
  max-width: 34em;
}

.page-about .ab-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin: 30px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--tb-line);
  list-style: none;
}

.page-about .ab-facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 13px;
  color: var(--tb-mist);
}

.page-about .ab-facts b {
  font-family: var(--tb-font-mono);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--tb-green-lt);
}

/* ---------- 通用图 ---------- */
.page-about .ab-figure {
  margin: 28px 0 0;
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--tb-line);
  object-fit: cover;
}

.page-about .ab-figure__cap {
  margin-top: 10px;
  padding-left: 10px;
  border-left: 2px solid var(--tb-print);
  font-size: 13px;
  line-height: 1.7;
  color: var(--tb-mist);
}

.page-about .ab-figure--band img {
  aspect-ratio: 16 / 7;
}

.page-about .ab-masthead__figure {
  margin-top: 0;
}

.page-about .ab-masthead__figure img {
  aspect-ratio: 14 / 9;
}

/* ---------- 双栏结构 ---------- */
.page-about .ab-layout {
  display: grid;
  gap: 20px;
  padding: 44px 0 0;
}

.page-about .ab-toc {
  padding-bottom: 4px;
  border-bottom: 1px solid var(--tb-line);
}

.page-about .ab-toc__title {
  margin: 0 0 8px;
  font-family: var(--tb-font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--tb-mist);
}

.page-about .ab-toc ul {
  display: flex;
  gap: 16px;
  margin: 0;
  padding: 0 0 8px;
  overflow-x: auto;
  list-style: none;
}

.page-about .ab-toc a {
  display: block;
  white-space: nowrap;
  padding: 4px 0;
  font-size: 13px;
  color: var(--tb-mist);
  text-decoration: none;
  transition: color 180ms var(--tb-ease);
}

.page-about .ab-toc a:hover {
  color: var(--tb-green-lt);
}

.page-about .ab-main {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .ab-section {
  padding: 46px 0;
  border-top: 1px solid var(--tb-line);
}

.page-about .ab-section:first-of-type {
  padding-top: 0;
  border-top: 0;
}

.page-about .ab-kicker {
  margin: 0 0 10px;
  font-family: var(--tb-font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--tb-print);
}

.page-about .ab-h2 {
  margin: 0 0 18px;
  font-family: var(--tb-font-heading);
  font-weight: 600;
  font-size: 27px;
  line-height: 1.26;
  color: var(--tb-white);
}

.page-about .ab-p {
  max-width: 34em;
  margin: 0 0 18px;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--tb-text);
}

.page-about .ab-link {
  color: var(--tb-green-lt);
  text-decoration: none;
  border-bottom: 1px solid rgba(111, 212, 138, 0.45);
}

.page-about .ab-link:hover {
  color: var(--tb-green);
  border-bottom-color: var(--tb-green);
}

.page-about .ab-note {
  max-width: 34em;
  margin: 0;
  padding: 14px 16px;
  border-left: 2px solid var(--tb-orange);
  background: rgba(255, 122, 26, 0.06);
  font-size: 14px;
  line-height: 1.8;
  color: var(--tb-mist);
}

/* ---------- 三条做法 ---------- */
.page-about .ab-rules {
  margin-top: 6px;
}

.page-about .ab-rule {
  display: grid;
  gap: 8px;
  padding: 22px 0;
  border-top: 1px solid var(--tb-line);
}

.page-about .ab-rule__idx {
  font-family: var(--tb-font-mono);
  font-size: 30px;
  line-height: 1;
  color: var(--tb-orange);
}

.page-about .ab-rule__t {
  margin: 0 0 8px;
  font-family: var(--tb-font-heading);
  font-size: 20px;
  font-weight: 600;
  color: var(--tb-white);
}

.page-about .ab-rule__d {
  max-width: 36em;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--tb-text);
}

/* ---------- 纸张叠层 ---------- */
.page-about .ab-stack {
  display: grid;
  gap: 18px;
  margin: 26px 0 0;
}

.page-about .ab-slip {
  padding: 20px 22px;
  background: var(--tb-cream);
  color: var(--tb-brown);
  border: 1px solid var(--ab-paper-line);
  box-shadow: 6px 6px 0 rgba(6, 18, 31, 0.55);
}

.page-about .ab-slip:nth-child(1) { transform: rotate(-0.5deg); }
.page-about .ab-slip:nth-child(2) { transform: rotate(0.4deg); }
.page-about .ab-slip:nth-child(3) { transform: rotate(-0.25deg); }

.page-about .ab-slip__idx {
  display: block;
  margin-bottom: 8px;
  font-family: var(--tb-font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--tb-print);
}

.page-about .ab-slip__t {
  margin: 0 0 8px;
  font-family: var(--tb-font-heading);
  font-size: 18px;
  font-weight: 600;
  color: var(--tb-brown);
}

.page-about .ab-slip p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: rgba(30, 23, 18, 0.86);
}

/* ---------- 比赛日步骤 ---------- */
.page-about .ab-steps {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-step {
  display: grid;
  gap: 6px;
  padding: 20px 0;
  border-top: 1px solid var(--tb-line);
}

.page-about .ab-step__time {
  font-family: var(--tb-font-mono);
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--tb-green-lt);
}

.page-about .ab-step__t {
  margin: 0 0 6px;
  font-family: var(--tb-font-heading);
  font-size: 18px;
  font-weight: 600;
  color: var(--tb-white);
}

.page-about .ab-step__d {
  max-width: 36em;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--tb-text);
}

/* ---------- 团队筛选 ---------- */
.page-about .tb-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 6px;
}

.page-about .tb-filter__btn {
  min-height: 44px;
  padding: 9px 15px;
  font: inherit;
  font-size: 14px;
  color: var(--tb-text);
  background: transparent;
  border: 1px solid var(--tb-line-strong);
  border-radius: 0;
  cursor: pointer;
  transition: background-color 180ms var(--tb-ease), border-color 180ms var(--tb-ease), color 180ms var(--tb-ease);
}

.page-about .tb-filter__btn:hover {
  border-color: var(--tb-green-lt);
  color: var(--tb-green-lt);
}

.page-about .tb-filter__btn[data-filter-active="true"],
.page-about .tb-filter__btn[aria-pressed="true"] {
  background: var(--tb-green);
  border-color: var(--tb-green);
  color: var(--tb-ink);
}

.page-about .tb-filter__meta {
  margin: 12px 0 0;
  font-family: var(--tb-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--tb-mist);
}

.page-about .ab-team__grid {
  display: grid;
  gap: 0;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-team__card {
  padding: 22px 0;
  border-top: 1px solid var(--tb-line);
}

.page-about .ab-team__tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 9px;
  font-family: var(--tb-font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--tb-green-lt);
  border: 1px solid rgba(111, 212, 138, 0.5);
}

.page-about .ab-team__name {
  margin: 0 0 8px;
  font-family: var(--tb-font-heading);
  font-size: 19px;
  font-weight: 600;
  color: var(--tb-white);
}

.page-about .ab-team__card p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--tb-text);
}

/* ---------- 改版时间轴 ---------- */
.page-about .ab-line {
  position: relative;
  margin: 28px 0 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .ab-line::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(180deg, var(--tb-green) 0%, var(--tb-orange) 100%);
}

.page-about .ab-line__item {
  position: relative;
  padding-bottom: 32px;
}

.page-about .ab-line__item:last-child {
  padding-bottom: 0;
}

.page-about .ab-line__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 10px;
  width: 11px;
  height: 11px;
  background: var(--tb-deep);
  border: 2px solid var(--tb-green);
  transform: rotate(45deg);
}

.page-about .ab-line__year {
  display: block;
  margin-bottom: 8px;
  font-family: var(--tb-font-mono);
  font-size: 30px;
  line-height: 1;
  color: var(--tb-white);
}

.page-about .ab-line__item:nth-child(2) .ab-line__year {
  font-size: 26px;
  color: rgba(247, 250, 255, 0.84);
}

.page-about .ab-line__item:nth-child(3) .ab-line__year {
  font-size: 22px;
  color: rgba(247, 250, 255, 0.68);
}

.page-about .ab-line__t {
  margin: 0 0 8px;
  font-family: var(--tb-font-heading);
  font-size: 19px;
  font-weight: 600;
  color: var(--tb-white);
}

.page-about .ab-line__d {
  max-width: 36em;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--tb-text);
}

/* ---------- 下一步 ---------- */
.page-about .ab-next {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.page-about .ab-next__card {
  display: block;
  padding: 22px 20px;
  text-decoration: none;
  border: 1px solid var(--tb-orange);
  background: rgba(255, 122, 26, 0.06);
  transition: background-color 180ms var(--tb-ease), transform 180ms var(--tb-ease);
}

.page-about .ab-next__card:hover {
  background: rgba(255, 122, 26, 0.14);
  transform: translateY(-2px);
}

.page-about .ab-next__k {
  display: block;
  margin-bottom: 10px;
  font-family: var(--tb-font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--tb-orange);
}

.page-about .ab-next__t {
  margin: 0 0 8px;
  font-family: var(--tb-font-display);
  font-weight: 800;
  font-size: 22px;
  letter-spacing: -0.01em;
  color: var(--tb-white);
}

.page-about .ab-next__d {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--tb-text);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-title {
    font-size: 48px;
  }

  .page-about .ab-h2 {
    font-size: 30px;
  }

  .page-about .ab-rule {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
  }

  .page-about .ab-step {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 24px;
  }

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

@media (min-width: 760px) {
  .page-about .ab-team__grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .ab-team__card:nth-child(odd) {
    padding-right: 28px;
    border-right: 1px solid var(--tb-line);
  }

  .page-about .ab-team__card:nth-child(even) {
    padding-left: 28px;
  }

  .page-about .ab-masthead {
    padding: 56px 0 70px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-masthead__grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 56px;
    align-items: center;
  }

  .page-about .ab-title {
    font-size: 58px;
  }
}

@media (min-width: 1000px) {
  .page-about .ab-layout {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: 64px;
    padding-top: 60px;
  }

  .page-about .ab-toc {
    position: sticky;
    top: calc(var(--tb-header-h) + 28px);
    align-self: start;
    padding-bottom: 0;
    border-bottom: 0;
  }

  .page-about .ab-toc ul {
    display: block;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .ab-toc a {
    white-space: normal;
    padding: 7px 0 7px 12px;
    border-left: 2px solid transparent;
    font-size: 14px;
  }

  .page-about .ab-toc a:hover {
    border-left-color: var(--tb-orange);
  }

  .page-about .ab-section {
    padding: 62px 0;
  }

  .page-about .ab-h2 {
    font-size: 34px;
    max-width: 22em;
  }

  .page-about .ab-p {
    font-size: 17px;
  }
}

@media (min-width: 1200px) {
  .page-about .ab-title {
    font-size: 64px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-next__card {
    transition: background-color 180ms linear;
  }

  .page-about .ab-next__card:hover {
    transform: none;
  }
}