.page-about {
  --ab-soft: rgba(63, 232, 196, 0.1);
  --ab-soft-2: rgba(255, 138, 60, 0.12);
  display: block;
  overflow-x: clip;
  color: var(--paper);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: clamp(1rem, 3vw, 1.75rem);
  padding-bottom: clamp(0.75rem, 2vw, 1.25rem);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  color: var(--muted);
}

.page-about .breadcrumb__link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s var(--ease);
}

.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  border-bottom-color: var(--cyan);
}

.page-about .breadcrumb__item {
  color: var(--muted);
}

.page-about .breadcrumb__item::before,
.page-about .breadcrumb__current::before {
  content: "/";
  margin-right: 0.5rem;
  color: var(--line);
}

.page-about .breadcrumb__current {
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -22%;
  right: -14%;
  width: min(82vw, 780px);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at 32% 32%, rgba(63, 232, 196, 0.3), rgba(18, 169, 143, 0.07) 52%, transparent 74%);
  clip-path: polygon(20% 0, 100% 0, 100% 72%, 0 100%);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  bottom: -34%;
  left: -16%;
  width: min(52vw, 460px);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at 58% 42%, rgba(255, 138, 60, 0.24), transparent 70%);
  clip-path: polygon(0 0, 100% 20%, 76% 100%, 0 86%);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero__inner {
  padding-block: clamp(2.25rem, 6vw, 4.5rem) clamp(2.25rem, 6vw, 4rem);
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-hero__lead .eyebrow {
  margin-bottom: 0.9rem;
}

.page-about .about-hero__lead .h1 {
  margin: 0 0 clamp(1rem, 2.4vw, 1.4rem);
  font-size: clamp(1.9rem, 6.4vw, 4.1rem);
  line-height: 1.06;
  letter-spacing: 0.02em;
  font-weight: 900;
  color: var(--paper);
}

.page-about .about-hero__lead .lede {
  margin: 0;
  max-width: 40ch;
  font-size: clamp(0.96rem, 2.2vw, 1.12rem);
  line-height: 1.85;
  color: var(--muted);
}

/* 指标条 */
.page-about .statline {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-tag);
  overflow: hidden;
}

.page-about .statline__item {
  background: linear-gradient(160deg, rgba(16, 32, 27, 0.96), rgba(10, 21, 18, 0.86));
  padding: clamp(0.9rem, 2.4vw, 1.3rem) clamp(1rem, 2.4vw, 1.45rem);
  border-left: 3px solid var(--cyan);
}

.page-about .statline__item--alert {
  border-left-color: var(--orange);
}

.page-about .statline__label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--muted);
  margin-bottom: 0.55rem;
}

.page-about .statline__value {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 5vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .statline__item--alert .statline__value {
  color: var(--orange);
}

.page-about .statline__unit {
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

/* 页内跳转 */
.page-about .about-hero__jump {
  list-style: none;
  margin: 0;
  padding: clamp(0.85rem, 2vw, 1.1rem) 0 0;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.35rem;
}

.page-about .about-hero__jump a {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: var(--muted);
  text-decoration: none;
  padding-bottom: 0.15rem;
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

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

@media (min-width: 1024px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.9fr);
    align-items: end;
    column-gap: clamp(2rem, 6vw, 5rem);
  }

  .page-about .about-hero__lead {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .statline {
    grid-column: 2;
    grid-row: 1;
    margin-bottom: 0.5rem;
  }

  .page-about .about-hero__jump {
    grid-column: 1 / -1;
    grid-row: 2;
  }
}

/* ---------- 赛季编年 ---------- */
.page-about .about-chronicle {
  position: relative;
}

.page-about .about-chronicle__range {
  font-size: 0.76rem;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.page-about .chron {
  list-style: none;
  margin: clamp(1rem, 3vw, 1.75rem) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .chron__row {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.7rem;
  padding: clamp(1.15rem, 3vw, 1.7rem) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .chron__row::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), transparent);
  transition: width 0.55s var(--ease);
}

.page-about .chron__row:hover::after,
.page-about .chron__row:focus-within::after {
  width: 44%;
}

.page-about .chron__year {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.page-about .chron__num {
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 4.8vw, 2.9rem);
  font-weight: 700;
  line-height: 0.84;
  letter-spacing: -0.03em;
  color: var(--cyan-dim);
  font-variant-numeric: tabular-nums;
}

.page-about .chron__row--key .chron__num {
  color: var(--cyan);
}

.page-about .chron__row--key:nth-child(6) .chron__num {
  color: var(--orange);
}

.page-about .chron__note {
  display: none;
}

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

.page-about .chron__title {
  margin: 0 0 0.45rem;
  font-size: clamp(1.05rem, 2.4vw, 1.32rem);
  font-weight: 700;
  letter-spacing: 0.015em;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .chron__text {
  margin: 0;
  max-width: 42em;
  font-size: 0.93rem;
  line-height: 1.82;
  color: var(--muted);
}

.page-about .chron__toggle {
  appearance: none;
  margin-top: 0.85rem;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius-tag);
  padding: 0.36rem 0.72rem;
  font-family: var(--font-mono);
  font-size: 0.71rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
  cursor: pointer;
  transition: border-color 0.25s var(--ease), background-color 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .chron__toggle::after {
  content: " ↓";
}

.page-about .chron__toggle[aria-expanded="true"]::after {
  content: " ↑";
}

.page-about .chron__toggle:hover {
  border-color: var(--cyan);
  background: rgba(63, 232, 196, 0.09);
}

.page-about .chron__toggle:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .chron__detail {
  margin-top: 0.95rem;
  padding: 0.9rem 1.05rem;
  background: var(--ink-800);
  border-left: 2px solid var(--cyan-dim);
  border-radius: 0 var(--radius-tag) var(--radius-tag) 0;
}

.page-about .chron__detail[hidden] {
  display: none;
}

.page-about .chron__detail ul {
  margin: 0;
  padding-left: 1.05rem;
  display: grid;
  gap: 0.4rem;
}

.page-about .chron__detail li {
  font-size: 0.88rem;
  line-height: 1.78;
  color: var(--paper);
}

.page-about .chron__detail li::marker {
  color: var(--cyan);
}

@media (min-width: 820px) {
  .page-about .chron__row {
    grid-template-columns: minmax(130px, 176px) minmax(0, 1fr);
    gap: clamp(1.25rem, 4vw, 3rem);
    align-items: start;
  }

  .page-about .chron__year {
    align-items: flex-start;
  }

  .page-about .chron__note {
    display: block;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 0.62rem;
    letter-spacing: 0.24em;
    color: var(--muted);
    padding-top: 0.25rem;
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  position: relative;
  background: radial-gradient(58% 52% at 100% 0%, var(--ab-soft), transparent 68%);
}

.page-about .about-team__meta {
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .team-grid {
  margin-top: clamp(1.25rem, 3.5vw, 2.25rem);
  display: grid;
  gap: clamp(1.35rem, 4vw, 2.5rem);
}

.page-about .team-grid__figure {
  margin: 0;
}

.page-about .team-grid__panel {
  min-width: 0;
}

.page-about .team-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: clamp(1rem, 2.6vw, 1.4rem);
}

.page-about .team-chips .season-chip {
  appearance: none;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.45rem 0.95rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.25s var(--ease), background-color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .team-chips .season-chip:hover {
  color: var(--paper);
  border-color: var(--cyan-dim);
}

.page-about .team-chips .season-chip:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .team-chips .season-chip[aria-selected="true"],
.page-about .team-chips .season-chip[data-active] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-900);
}

.page-about .team-panels {
  display: grid;
  gap: 0.75rem;
}

.page-about .team-panel {
  padding: clamp(1.05rem, 2.8vw, 1.5rem) clamp(1.1rem, 3vw, 1.6rem);
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius-tag);
}

.page-about .team-panel__title {
  margin: 0 0 0.5rem;
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-about .team-panel p {
  margin: 0;
  max-width: 38em;
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--muted);
}

@media (min-width: 900px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 0.74fr) minmax(0, 1.26fr);
    align-items: start;
  }
}

/* ---------- 校对流程 ---------- */
.page-about .about-flow__meta {
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .flow {
  list-style: none;
  margin: clamp(1.25rem, 3.5vw, 2rem) 0 clamp(1.5rem, 4vw, 2.5rem);
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-tag);
  overflow: hidden;
}

.page-about .flow__step {
  background: linear-gradient(170deg, rgba(16, 32, 27, 0.98), rgba(10, 21, 18, 0.9));
  padding: clamp(1.15rem, 3vw, 1.85rem);
  border-top: 3px solid var(--line);
}

.page-about .flow__step--alert {
  border-top-color: var(--orange);
}

.page-about .flow__idx {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--muted);
  margin-bottom: 0.7rem;
}

.page-about .flow__step--alert .flow__idx {
  color: var(--orange);
}

.page-about .flow__title {
  margin: 0 0 0.55rem;
  font-size: clamp(1rem, 2.2vw, 1.16rem);
  font-weight: 700;
  line-height: 1.42;
  letter-spacing: 0.015em;
  color: var(--paper);
}

.page-about .flow__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.82;
  color: var(--muted);
}

.page-about .about-flow__figure {
  margin: 0;
  aspect-ratio: 3 / 2;
}

@media (min-width: 800px) {
  .page-about .flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 引用方 ---------- */
.page-about .about-users__meta {
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .user-list {
  list-style: none;
  margin: clamp(1.25rem, 3.5vw, 2rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-tag);
  overflow: hidden;
}

.page-about .user-list__item {
  background: var(--ink-800);
  padding: clamp(1.15rem, 3vw, 1.85rem);
}

.page-about .user-list__item .label-tag {
  display: inline-block;
  margin-bottom: 0.8rem;
}

.page-about .user-list__title {
  margin: 0 0 0.55rem;
  font-size: clamp(1rem, 2.2vw, 1.16rem);
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: 0.015em;
  color: var(--paper);
}

.page-about .user-list__item p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.82;
  color: var(--muted);
}

@media (min-width: 860px) {
  .page-about .user-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 指标版本 ---------- */
.page-about .about-version {
  position: relative;
  background: radial-gradient(54% 48% at 0% 100%, var(--ab-soft-2), transparent 70%);
}

.page-about .about-version__meta {
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .version-grid {
  margin-top: clamp(1.25rem, 3.5vw, 2rem);
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.75rem);
}

.page-about .version-copy {
  min-width: 0;
}

.page-about .version-num {
  margin: 0 0 0.9rem;
  font-size: clamp(2.6rem, 9vw, 5rem);
  font-weight: 700;
  line-height: 0.86;
  letter-spacing: -0.03em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .version-lead {
  margin: 0 0 clamp(1.1rem, 2.8vw, 1.6rem);
  max-width: 40ch;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--paper);
}

.page-about .version-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.page-about .version-list li {
  padding-left: 1rem;
  border-left: 2px solid var(--line);
  font-size: 0.89rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .version-list__key {
  display: block;
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--cyan-dim);
  margin-bottom: 0.2rem;
}

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

@media (min-width: 920px) {
  .page-about .version-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }
}

/* ---------- 延伸入口 ---------- */
.page-about .about-next {
  padding-bottom: clamp(2.5rem, 7vw, 4.5rem);
}

.page-about .next-grid {
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-tag);
  overflow: hidden;
}

.page-about .next-card {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding: clamp(1.2rem, 3vw, 1.8rem);
  background: var(--ink-800);
  text-decoration: none;
  transition: background-color 0.3s var(--ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  background: var(--ink-700);
}

.page-about .next-card:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .next-card__kicker {
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--cyan-dim);
}

.page-about .next-card__title {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .next-card__arrow {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--cyan);
  transition: transform 0.3s var(--ease);
}

.page-about .next-card:hover .next-card__arrow,
.page-about .next-card:focus-visible .next-card__arrow {
  transform: translateX(6px);
}

@media (min-width: 800px) {
  .page-about .next-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}