/* ==========================================================
   品牌总览 /overview/ —— 页面专属样式
   作用域：.page-about
   ========================================================== */

.page-about {
  --about-rail: 36px;
  --about-card-bg: rgba(13, 42, 86, .55);
  display: block;
  background: var(--ink-900);
  color: var(--text-body);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: var(--s-2) var(--s-3);
  background:
    radial-gradient(120% 85% at 10% -12%, rgba(22, 57, 111, .95), rgba(13, 42, 86, .3) 50%, rgba(7, 22, 51, 0) 78%),
    var(--ink-900);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(36, 80, 155, .13) 1px, transparent 1px),
    linear-gradient(90deg, rgba(36, 80, 155, .13) 1px, transparent 1px);
  background-size: 64px 64px, 64px 64px;
  -webkit-mask-image: radial-gradient(80% 62% at 72% 0%, #000 0%, transparent 72%);
  mask-image: radial-gradient(80% 62% at 72% 0%, #000 0%, transparent 72%);
}

.page-about .about-hero__glow {
  position: absolute;
  top: -180px;
  right: -140px;
  z-index: -1;
  width: min(600px, 76vw);
  aspect-ratio: 1 / 1;
  border-radius: 48% 52% 40% 60% / 55% 42% 58% 45%;
  background: radial-gradient(circle at 34% 34%, rgba(232, 84, 42, .36), rgba(232, 84, 42, 0) 66%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--s-2);
  align-items: start;
  margin-top: var(--s-1);
}

.page-about .about-hero__title {
  margin: .35em 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(29px, 5.4vw, 50px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--white);
  text-wrap: balance;
}

.page-about .about-hero__lede {
  margin: var(--s-1) 0 0;
  max-width: 48ch;
  color: var(--text-body);
}

.page-about .about-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: var(--s-2);
}

.page-about .about-hero__fig {
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-lg) var(--r-md) var(--r-lg) var(--r-md);
  background: var(--ink-800);
}

.page-about .about-hero__fig .media__img,
.page-about .about-fig .media__img {
  display: block;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 24px;
  margin: var(--s-3) 0 0;
  padding: var(--s-2) 0 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .about-fact__label {
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 正文骨架：左侧目录 + 右侧叙事 ---------- */

.page-about .about-body {
  padding-block: var(--s-3);
  background: linear-gradient(180deg, var(--ink-900) 0%, #05101f 100%);
}

.page-about .about-doc {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--s-3);
  align-items: start;
}

.page-about .about-aside {
  align-self: start;
}

.page-about .about-sec + .about-sec {
  margin-top: var(--s-3);
}

/* ---------- 章节标题组 ---------- */

.page-about .about-head {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 6px 14px;
  margin: 0 0 var(--s-2);
  padding-bottom: var(--s-1);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-head__idx {
  grid-row: span 2;
  margin: 0;
  padding-top: 7px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: .06em;
  color: var(--accent);
}

.page-about .about-head__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(21px, 2.9vw, 29px);
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .about-head__text {
  grid-column: 2;
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--text-body);
}

/* ---------- 小列表（首屏旁注卡片内） ---------- */

.page-about .about-mini {
  list-style: none;
  margin: var(--s-1) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-mini > li {
  position: relative;
  padding-left: 16px;
  font-size: 15px;
  line-height: 1.62;
  color: var(--text-body);
}

.page-about .about-mini > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .6em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

/* ---------- 版本演进 ---------- */

.page-about .about-versions {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--s-2);
}

.page-about .about-versions__side {
  display: grid;
  gap: var(--s-1);
}

.page-about .about-fig {
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md) var(--r-lg) var(--r-md) var(--r-lg);
  background: var(--ink-800);
}

/* 纵向时间轴 */

.page-about .about-tl {
  position: relative;
  padding-left: var(--about-rail);
}

.page-about .about-tl__rail {
  position: absolute;
  left: 0;
  top: 10px;
  width: 12px;
  height: calc(100% - 20px);
  overflow: visible;
  pointer-events: none;
}

.page-about .about-tl__rail polyline {
  fill: none;
  stroke: var(--line);
  stroke-width: 2;
  stroke-linecap: round;
}

.page-about .about-tl__item {
  position: relative;
  margin: 0 0 var(--s-1);
  padding-bottom: var(--s-1);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-tl__item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-tl__sum {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  padding: 2px 0;
  list-style: none;
  cursor: pointer;
}

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

.page-about .about-tl__sum::before {
  content: "";
  position: absolute;
  left: calc(var(--about-rail) * -1);
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(232, 84, 42, .14);
}

.page-about .about-tl__sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1;
  color: var(--muted);
}

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

.page-about .about-tl__year {
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: .04em;
  color: var(--accent-hi);
}

.page-about .about-tl__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

.page-about .about-tl__body {
  margin-top: 6px;
  max-width: 60ch;
}

.page-about .about-tl__body p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--text-body);
}

.page-about .about-tl__item--now .about-tl__sum::before {
  background: var(--state);
  box-shadow: 0 0 0 4px rgba(34, 211, 208, .16);
  animation: about-pulse 2.4s var(--ease) infinite;
}

.page-about .about-tl__item--now .about-tl__year {
  color: var(--state);
}

@keyframes about-pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(34, 211, 208, .16); }
  50% { box-shadow: 0 0 0 9px rgba(34, 211, 208, .03); }
}

/* 版本对照表 */

.page-about .about-tbl-wrap {
  margin-top: var(--s-3);
  overflow-x: auto;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: var(--about-card-bg);
}

.page-about .about-tbl {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
  font-size: 15px;
}

.page-about .about-tbl caption {
  padding: 18px 18px 6px;
  text-align: left;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  color: var(--white);
}

.page-about .about-tbl th,
.page-about .about-tbl td {
  padding: 13px 18px;
  text-align: left;
  vertical-align: top;
  line-height: 1.6;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-tbl thead th {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: .06em;
  color: var(--muted);
  white-space: nowrap;
}

.page-about .about-tbl tbody th {
  font-family: var(--font-head);
  font-weight: 600;
  color: var(--white);
}

.page-about .about-tbl td {
  color: var(--text-body);
}

.page-about .about-tbl tbody td:last-child {
  color: var(--white);
}

/* ---------- 联赛分组 ---------- */

.page-about .league-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .league-item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 22px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .league-item:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .league-item__idx {
  grid-row: span 2;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .league-item__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

.page-about .league-item__text {
  grid-column: 2;
  margin: 0;
  max-width: 66ch;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--text-body);
}

/* ---------- 更新流程 ---------- */

.page-about .about-steps {
  list-style: none;
  margin: var(--s-2) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  font-size: 15.5px;
  line-height: 1.62;
  color: var(--text-body);
}

.page-about .about-steps__n {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--accent-hi);
}

/* ---------- 团队与协作 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--s-2);
}

.page-about .team-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .team-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 18px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .team-item:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .team-item__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

.page-about .team-item__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--text-body);
}

.page-about .about-team__side {
  display: grid;
  gap: var(--s-2);
  align-content: start;
}

.page-about .about-note {
  margin: 0;
  padding-left: 16px;
  border-left: 2px solid var(--line);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-note--wide {
  margin-top: var(--s-3);
  max-width: 68ch;
}

/* ---------- 服务规模 ---------- */

.page-about .scale-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--s-2) var(--gap);
}

.page-about .scale-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  padding-top: 16px;
  border-top: 2px solid var(--line);
}

.page-about .about-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(22px, 3.4vw, 40px);
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-about .scale-item__label {
  font-size: 14px;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 长期更新 ---------- */

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

.page-about .about-commit__card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
  padding: var(--s-1);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-lg) var(--r-md) var(--r-md) var(--r-lg);
  background: var(--about-card-bg);
}

.page-about .about-commit__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-about .about-commit__ver {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 40px;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--state);
}

.page-about .about-commit__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--text-body);
}

.page-about .about-commit__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}

.page-about .copy-btn {
  align-self: flex-start;
}

/* ---------- 响应式 ---------- */

@media (max-width: 1023px) {
  .page-about .about-aside .toc__list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 14px;
  }

  .page-about .about-aside .toc__list > li {
    flex: 0 0 auto;
  }
}

@media (min-width: 720px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: var(--s-3);
  }

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

@media (min-width: 1040px) {
  .page-about .about-doc {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: var(--s-3);
  }

  .page-about .about-aside {
    position: sticky;
    top: calc(var(--bar-h) + 20px);
  }

  .page-about .about-versions {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    gap: var(--s-3);
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: var(--s-3);
  }

  .page-about .about-commit {
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
  }
}

@media (min-width: 620px) {
  .page-about .team-item {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 6px var(--s-2);
    align-items: baseline;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__item--now .about-tl__sum::before {
    animation: none;
  }
}
</style>
<<<PAGE_CSS_END>>>