.page-about {
  --about-rule: rgba(155, 246, 224, 0.16);
  position: relative;
}

/* 首屏 */
.page-about .about-hero {
  padding: clamp(20px, 3.5vw, 44px) 0 clamp(28px, 4.5vw, 56px);
  border-bottom: 4px solid var(--panel);
  background:
    radial-gradient(1000px 380px at 12% -10%, rgba(63, 242, 200, 0.1), transparent 62%),
    radial-gradient(720px 320px at 92% 6%, rgba(122, 92, 255, 0.1), transparent 60%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
}

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

.page-about .about-hero__copy .kicker {
  margin: 0 0 10px;
}

.page-about .about-hero__copy .page-title {
  margin: 0 0 16px;
  letter-spacing: 0.01em;
}

.page-about .about-hero__copy .lede {
  margin: 0;
  max-width: 64ch;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin: 0;
  padding: 2px;
  background: var(--about-rule);
  border: 4px solid var(--panel);
  box-shadow: var(--shadow-hard);
}

.page-about .about-hero__fact {
  background: linear-gradient(160deg, var(--panel-deep), var(--bg));
  padding: 14px 16px 16px;
}

.page-about .about-hero__fact dt {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .about-hero__fact dd {
  margin: 6px 0 0;
  font-family: var(--font-narrow);
  font-size: clamp(28px, 3.6vw, 38px);
  line-height: 1;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}

/* 主体与章节目录 */
.page-about .about-body {
  padding: clamp(28px, 4.5vw, 60px) 0 clamp(40px, 6vw, 88px);
}

.page-about .about-shell {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

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

.page-about .about-toc {
  border: 4px solid var(--panel);
  background: var(--panel-deep);
  padding: 16px 14px;
}

.page-about .about-toc__title {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-toc__link {
  display: block;
  padding: 9px 10px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--paper);
  text-decoration: none;
  border-left: 3px solid transparent;
  border-radius: 0 var(--r) var(--r) 0;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.page-about .about-toc__link:hover {
  background: rgba(63, 242, 200, 0.08);
  border-left-color: var(--mist);
}

.page-about .about-toc__link[data-active] {
  color: var(--neon);
  border-left-color: var(--neon);
  background: rgba(63, 242, 200, 0.1);
}

/* 章节通用头部 */
.page-about .about-sec {
  padding-block: clamp(30px, 4.5vw, 58px);
  border-top: 4px solid var(--about-rule);
}

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-head {
  margin-bottom: clamp(20px, 3vw, 34px);
  max-width: 84ch;
}

.page-about .about-head__num {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 14px;
  font-family: var(--font-narrow);
  font-size: clamp(28px, 4.2vw, 44px);
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}

.page-about .about-head__num::after {
  content: "";
  flex: 1 1 auto;
  height: 2px;
  background: linear-gradient(90deg, var(--neon) 0%, rgba(63, 242, 200, 0.04) 100%);
}

.page-about .about-h2 {
  margin: 0 0 12px;
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.22;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-lead {
  margin: 0;
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.78;
  color: var(--mist);
  max-width: 66ch;
}

/* 第一节约时间轴 */
.page-about .axis {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .axis__item {
  border: 4px solid var(--panel);
  background: linear-gradient(150deg, var(--panel-deep), var(--bg) 78%);
  box-shadow: var(--shadow-hard);
  transition: border-color 0.25s ease;
}

.page-about .axis__item[open] {
  border-color: var(--line-strong);
}

.page-about .axis__summary {
  display: grid;
  grid-template-columns: auto auto minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(10px, 2vw, 18px);
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .axis__marker {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 5px rgba(255, 139, 61, 0.16);
}

.page-about .axis__year {
  font-family: var(--font-narrow);
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1;
  color: var(--amber-soft);
  font-variant-numeric: tabular-nums;
}

.page-about .axis__stage {
  font-size: clamp(14px, 1.1vw, 16px);
  line-height: 1.5;
  color: var(--paper);
}

.page-about .axis__plus {
  position: relative;
  width: 18px;
  height: 18px;
  flex: none;
}

.page-about .axis__plus::before,
.page-about .axis__plus::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background: var(--neon);
  transform: translate(-50%, -50%);
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.page-about .axis__plus::before {
  width: 18px;
  height: 2px;
}

.page-about .axis__plus::after {
  width: 2px;
  height: 18px;
}

.page-about .axis__item[open] .axis__plus::after {
  opacity: 0;
  transform: translate(-50%, -50%) scaleY(0);
}

.page-about .axis__body {
  margin: 0;
  padding: 14px 18px 18px clamp(24px, 4vw, 58px);
  border-top: 1px solid var(--about-rule);
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

/* 第二节球队档案 */
.page-about .about-file__grid {
  align-items: start;
}

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

.page-about .stack-card {
  border: 4px solid var(--panel);
  background: linear-gradient(150deg, var(--panel-deep), var(--bg) 82%);
  padding: 16px 18px 18px;
  box-shadow: var(--shadow-hard);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.page-about .stack-card:hover,
.page-about .stack-card:focus-within {
  transform: translateX(6px);
  border-color: var(--line-strong);
}

.page-about .stack-card__head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .stack-card__idx {
  font-family: var(--font-narrow);
  font-size: 22px;
  line-height: 1;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .stack-card__title {
  margin: 0;
  font-size: clamp(17px, 1.4vw, 20px);
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .stack-card__head .tag {
  margin-left: auto;
}

.page-about .stack-card__lead {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .stack-card__more {
  display: grid;
  gap: 8px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--about-rule);
}

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

.page-about .media-frame img {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* 第三节编辑部 */
.page-about .about-desk__grid {
  align-items: start;
}

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

.page-about .about-desk__grid .prose {
  margin-top: 0;
}

.page-about .desk-lines {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .desk-line {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 14px 16px;
  border: 2px solid var(--panel);
  border-left: 4px solid var(--neon);
  background: rgba(22, 71, 58, 0.45);
}

.page-about .desk-line__k {
  font-family: var(--font-narrow);
  font-size: 22px;
  line-height: 1.1;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}

.page-about .desk-line__t {
  margin: 0 0 4px;
  font-size: 16px;
  color: var(--paper);
}

.page-about .desk-line__d {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-band {
  margin-top: clamp(22px, 3vw, 34px);
  display: grid;
  gap: 2px;
  background: var(--about-rule);
  border: 4px solid var(--panel);
  box-shadow: var(--shadow-hard);
}

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

.page-about .about-band__val {
  display: block;
  font-family: var(--font-narrow);
  font-size: clamp(26px, 3.4vw, 34px);
  line-height: 1;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}

.page-about .about-band__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

/* 第四节场馆 */
.page-about .about-venue {
  margin-top: clamp(30px, 4.5vw, 58px);
  padding: clamp(28px, 4vw, 52px) 0;
  background: linear-gradient(180deg, var(--ink) 0%, #08170F 100%);
  border-top: 4px solid var(--panel);
  border-bottom: 4px solid var(--panel);
}

.page-about .about-venue__grid {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  margin-top: clamp(20px, 3vw, 30px);
}

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

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

.page-about .about-venue__copy p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-venue__rows {
  display: grid;
  gap: 8px;
  margin-top: 4px;
}

/* 第五节回应 */
.page-about .about-reply__grid {
  display: grid;
  gap: 14px;
}

.page-about .reply-card {
  border: 4px solid var(--panel);
  background: linear-gradient(150deg, var(--panel-deep), var(--bg) 85%);
  padding: 18px;
  box-shadow: var(--shadow-hard);
  transition: border-color 0.25s ease;
}

.page-about .reply-card:hover {
  border-color: var(--line-strong);
}

.page-about .reply-card__t {
  margin: 0 0 8px;
  font-size: 17px;
  color: var(--paper);
}

.page-about .reply-card__d {
  margin: 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--mist);
}

.page-about .about-cta {
  margin-top: clamp(22px, 3vw, 32px);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  padding: 20px clamp(18px, 2.6vw, 26px);
  border: 4px solid var(--panel);
  border-left: 8px solid var(--neon);
  background: var(--panel-deep);
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta__text {
  margin: 0;
  flex: 1 1 260px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--paper);
}

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

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

@media (min-width: 860px) {
  .page-about .about-venue__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(300px, 1fr);
    align-items: end;
  }
}

@media (min-width: 1080px) {
  .page-about .about-shell {
    grid-template-columns: minmax(0, 1fr) 236px;
    align-items: start;
  }

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

  .page-about .about-toc {
    grid-column: 2;
    grid-row: 1;
    position: sticky;
    top: 116px;
    align-self: start;
  }
}

@media (max-width: 640px) {
  .page-about .axis__summary {
    grid-template-columns: auto minmax(0, 1fr) auto;
    row-gap: 4px;
  }

  .page-about .axis__marker {
    grid-row: span 2;
  }

  .page-about .axis__stage {
    grid-column: 2 / 3;
  }

  .page-about .axis__plus {
    grid-column: 3;
    grid-row: 1 / span 2;
  }

  .page-about .axis__body {
    padding-left: 18px;
  }
}