.page-about {
  display: block;
  background: var(--ink);
  color: var(--silver);
  overflow-x: hidden;
}

.page-about .breadcrumbs {
  margin: clamp(18px, 3vw, 28px) 0 0;
  font-size: var(--fs-200);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4vw, 44px) 0 clamp(40px, 6vw, 76px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -38% -22% auto -32%;
  height: 128%;
  background:
    radial-gradient(46% 40% at 20% 26%, rgba(58, 46, 92, 0.85), transparent 72%),
    radial-gradient(36% 32% at 88% 6%, rgba(53, 224, 214, 0.15), transparent 70%),
    radial-gradient(30% 30% at 58% 92%, rgba(255, 122, 61, 0.08), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 56px);
  align-items: center;
}

.page-about .about-hero-copy h1 {
  margin: 0.18em 0 0.5em;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 5vw, 3.25rem);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--white);
  max-width: 17ch;
}

.page-about .about-lede {
  margin: 0 0 0.9em;
  max-width: 56ch;
  font-size: var(--fs-300);
  line-height: 1.8;
  color: var(--dim-strong);
}

.page-about .about-lede-sub {
  font-size: var(--fs-300);
  color: var(--dim);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 1.4em;
}

.page-about .about-hero-visual {
  position: relative;
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(155deg, var(--night), var(--nebula));
  box-shadow: 0 34px 70px -46px rgba(53, 224, 214, 0.6);
}

.page-about .about-hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  opacity: 0.92;
}

.page-about .about-hero-visual::before,
.page-about .about-hero-visual::after {
  content: "";
  position: absolute;
  width: 30px;
  height: 30px;
  border: 1px solid var(--cyan);
  opacity: 0.72;
  pointer-events: none;
  z-index: 2;
}

.page-about .about-hero-visual::before {
  top: 6px;
  left: 6px;
  border-right: 0;
  border-bottom: 0;
  border-top-left-radius: 6px;
}

.page-about .about-hero-visual::after {
  right: 6px;
  bottom: 6px;
  border-left: 0;
  border-top: 0;
  border-bottom-right-radius: 6px;
}

.page-about .about-visual-cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 12px 16px;
  font-size: var(--fs-100);
  letter-spacing: 0.06em;
  color: var(--glow);
  background: linear-gradient(to top, rgba(6, 13, 26, 0.94), rgba(6, 13, 26, 0));
}

/* ---------- 规模条 ---------- */

.page-about .about-stripe {
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  background: linear-gradient(90deg, rgba(14, 27, 49, 0.92), rgba(58, 46, 92, 0.5), rgba(14, 27, 49, 0.92));
  padding: clamp(18px, 3vw, 28px) 0;
}

.page-about .about-stripe-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 14px;
}

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

.page-about .stripe-num {
  font-size: clamp(1.6rem, 3.4vw, 2.125rem);
  font-weight: 700;
  line-height: 1;
  color: var(--white);
  font-variant-numeric: tabular-nums;
}

.page-about .stripe-item:nth-child(2) .stripe-num {
  color: var(--cyan);
}

.page-about .stripe-item:nth-child(3) .stripe-num {
  color: var(--gold);
}

.page-about .stripe-label {
  font-size: var(--fs-100);
  letter-spacing: 0.06em;
  color: var(--dim);
  line-height: 1.45;
}

/* ---------- 主体双栏 ---------- */

.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(36px, 5vw, 60px);
  padding: clamp(46px, 7vw, 88px) 0 clamp(54px, 8vw, 96px);
  align-items: start;
}

.page-about .about-main {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.page-about .about-block {
  position: relative;
  min-width: 0;
}

.page-about .about-block + .about-block {
  margin-top: clamp(52px, 7vw, 92px);
}

.page-about .about-block-head {
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-about .about-block-head h2 {
  margin: 0.16em 0 0.55em;
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 3.2vw, 2.125rem);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.015em;
  color: var(--white);
}

.page-about .about-block-head p {
  margin: 0;
  max-width: 64ch;
  font-size: var(--fs-300);
  line-height: 1.8;
  color: var(--dim-strong);
}

/* ---------- 沿革时间轴 ---------- */

.page-about .era-track {
  list-style: none;
  margin: 0;
  padding: 4px 0 0 26px;
  border-left: 1px solid var(--line);
}

.page-about .era-item {
  position: relative;
  padding-bottom: clamp(22px, 3.4vw, 34px);
  scroll-margin-top: 128px;
}

.page-about .era-item:last-child {
  padding-bottom: 0;
}

.page-about .era-item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 10px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(245, 197, 66, 0.14), 0 0 14px rgba(245, 197, 66, 0.45);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-about .era-card {
  background: linear-gradient(150deg, rgba(14, 27, 49, 0.94), rgba(14, 27, 49, 0.72));
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: clamp(18px, 2.6vw, 26px);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about .era-item:hover .era-card {
  border-color: rgba(53, 224, 214, 0.34);
}

.page-about .era-item:target .era-card {
  border-color: rgba(245, 197, 66, 0.6);
  box-shadow: 0 0 0 1px rgba(245, 197, 66, 0.22), 0 22px 46px -28px rgba(245, 197, 66, 0.6);
}

.page-about .era-item:target::before {
  transform: scale(1.35);
  box-shadow: 0 0 0 6px rgba(245, 197, 66, 0.2), 0 0 20px rgba(245, 197, 66, 0.75);
}

.page-about .era-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.page-about .era-year {
  font-size: var(--fs-200);
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .era-card h3 {
  margin: 0 0 0.5em;
  font-family: var(--font-display);
  font-size: var(--fs-400);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .era-card p {
  margin: 0;
  font-size: var(--fs-300);
  line-height: 1.78;
  color: var(--dim-strong);
}

/* ---------- 覆盖范围数字墙 ---------- */

.page-about .scope-wall {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .scope-cell {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(16px, 2.6vw, 26px);
  background: var(--night);
  min-width: 0;
}

.page-about .scope-cell::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 34px;
  height: 2px;
  background: var(--cyan);
  opacity: 0.7;
}

.page-about .scope-cell:nth-child(3)::after {
  background: var(--gold);
}

.page-about .scope-num {
  font-size: clamp(1.85rem, 6.4vw, 3.25rem);
  font-weight: 700;
  line-height: 1;
  color: var(--white);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

.page-about .scope-label {
  font-size: var(--fs-200);
  color: var(--dim);
  line-height: 1.5;
}

.page-about .scope-foot {
  margin: 16px 0 0;
  max-width: 66ch;
  font-size: var(--fs-200);
  line-height: 1.8;
  color: var(--dim);
}

/* ---------- 进失球区间 ---------- */

.page-about .split-board {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: linear-gradient(140deg, rgba(14, 27, 49, 0.94), rgba(58, 46, 92, 0.36));
  padding: clamp(18px, 3vw, 30px);
}

.page-about .split-svg {
  display: block;
  width: 100%;
  max-width: 560px;
  height: auto;
  overflow: visible;
}

.page-about .split-svg .split-tag {
  fill: var(--silver);
  font-family: var(--font-sans);
  font-size: 13px;
  letter-spacing: 0.08em;
  opacity: 0.8;
}

.page-about .split-svg rect {
  transform-origin: left center;
  animation: about-bar-grow 0.95s cubic-bezier(0.22, 0.9, 0.3, 1) both;
}

.page-about .split-svg rect:nth-of-type(2) {
  animation-delay: 0.1s;
}

.page-about .split-svg rect:nth-of-type(3) {
  animation-delay: 0.2s;
}

.page-about .split-svg rect:nth-of-type(4) {
  animation-delay: 0.3s;
}

@keyframes about-bar-grow {
  from {
    transform: scaleX(0);
  }
  to {
    transform: scaleX(1);
  }
}

.page-about .split-legend {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
  font-size: var(--fs-200);
  color: var(--dim-strong);
}

.page-about .split-legend li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .legend-dot {
  width: 18px;
  height: 8px;
  border-radius: 999px;
  display: inline-block;
}

.page-about .legend-dot--for {
  background: linear-gradient(90deg, var(--cyan), rgba(155, 243, 236, 0.5));
}

.page-about .legend-dot--against {
  background: linear-gradient(90deg, var(--ember), rgba(255, 122, 61, 0.28));
}

.page-about .split-legend-note {
  color: var(--dim);
  font-size: var(--fs-100);
  letter-spacing: 0.04em;
}

.page-about .split-note {
  margin: 18px 0 0;
  max-width: 66ch;
  font-size: var(--fs-300);
  line-height: 1.8;
  color: var(--dim-strong);
}

/* ---------- 团队与排班 ---------- */

.page-about .team-visual {
  position: relative;
  margin: 0 0 clamp(20px, 3vw, 30px);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line-soft);
}

.page-about .team-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .team-visual-cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 12px 16px;
  font-size: var(--fs-100);
  letter-spacing: 0.06em;
  color: var(--glow);
  background: linear-gradient(to top, rgba(6, 13, 26, 0.94), rgba(6, 13, 26, 0));
}

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

.page-about .shift-row {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  grid-template-areas:
    "name time"
    "track track";
  align-items: center;
  gap: 6px 12px;
}

.page-about .shift-name {
  grid-area: name;
  font-size: var(--fs-200);
  color: var(--white);
  font-weight: 600;
  white-space: nowrap;
}

.page-about .shift-time {
  grid-area: time;
  font-size: var(--fs-100);
  color: var(--dim);
  text-align: right;
  letter-spacing: 0.04em;
}

.page-about .shift-track {
  grid-area: track;
  position: relative;
  height: 12px;
  border-radius: 999px;
  background: rgba(20, 40, 58, 0.92);
  border: 1px solid rgba(53, 224, 214, 0.1);
  overflow: hidden;
}

.page-about .shift-fill {
  position: absolute;
  top: 0;
  bottom: 0;
  left: var(--from);
  width: calc(var(--to) - var(--from));
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(53, 224, 214, 0.92), rgba(155, 243, 236, 0.5));
  transition: filter 0.3s ease;
}

.page-about .shift-row:hover .shift-fill {
  filter: brightness(1.2) saturate(1.15);
}

.page-about .shift-foot {
  margin: 18px 0 0;
  max-width: 66ch;
  font-size: var(--fs-200);
  line-height: 1.8;
  color: var(--dim);
}

/* ---------- 可视化组件 ---------- */

.page-about .viz-visual {
  margin: 0 0 clamp(20px, 3vw, 30px);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--night);
}

.page-about .viz-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .viz-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .viz-card {
  position: relative;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  background: rgba(14, 27, 49, 0.78);
  padding: 18px 18px 20px;
  min-width: 0;
  transition: border-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}

.page-about .viz-card:hover {
  border-color: rgba(53, 224, 214, 0.45);
  transform: translateY(-3px);
  box-shadow: 0 22px 44px -30px rgba(53, 224, 214, 0.7);
}

.page-about .viz-index {
  display: block;
  font-size: var(--fs-100);
  letter-spacing: 0.14em;
  color: rgba(53, 224, 214, 0.7);
  margin-bottom: 8px;
}

.page-about .viz-card h3 {
  margin: 0 0 0.4em;
  font-family: var(--font-display);
  font-size: var(--fs-400);
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.01em;
}

.page-about .viz-card p {
  margin: 0;
  font-size: var(--fs-200);
  line-height: 1.7;
  color: var(--dim-strong);
}

.page-about .viz-use {
  margin-top: 0.6em !important;
  font-size: var(--fs-100) !important;
  letter-spacing: 0.03em;
  color: var(--cyan) !important;
  opacity: 0.82;
  transition: opacity 0.3s ease;
}

.page-about .viz-card:hover .viz-use {
  opacity: 1;
}

/* ---------- 活动与合作 ---------- */

.page-about .community-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .community-card {
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
  background: linear-gradient(150deg, rgba(58, 46, 92, 0.55), rgba(14, 27, 49, 0.9));
  padding: clamp(18px, 2.8vw, 26px);
  min-width: 0;
}

.page-about .community-num {
  display: block;
  font-size: var(--fs-500);
  font-weight: 700;
  color: var(--gold);
  line-height: 1.1;
  margin-bottom: 10px;
  font-variant-numeric: tabular-nums;
}

.page-about .community-card h3 {
  margin: 0 0 0.5em;
  font-family: var(--font-display);
  font-size: var(--fs-400);
  font-weight: 800;
  color: var(--white);
}

.page-about .community-card p {
  margin: 0;
  font-size: var(--fs-200);
  line-height: 1.78;
  color: var(--dim-strong);
}

/* ---------- 侧栏 ---------- */

.page-about .about-rail {
  display: grid;
  gap: 14px;
  min-width: 0;
}

.page-about .rail-card {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: rgba(14, 27, 49, 0.72);
  padding: 18px;
}

.page-about .rail-card--accent {
  background: linear-gradient(150deg, rgba(53, 224, 214, 0.13), rgba(14, 27, 49, 0.9));
  border-color: rgba(53, 224, 214, 0.28);
}

.page-about .rail-card--quiet {
  background: rgba(20, 40, 58, 0.6);
}

.page-about .rail-title {
  margin: 0 0 12px;
  font-size: var(--fs-100);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--dim);
}

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

.page-about .rail-years a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 6px;
  border-radius: var(--radius-sm);
  color: var(--silver);
  text-decoration: none;
  font-size: var(--fs-200);
  transition: background 0.25s ease, color 0.25s ease;
}

.page-about .rail-years a:hover,
.page-about .rail-years a:focus-visible {
  background: rgba(53, 224, 214, 0.1);
  color: var(--white);
}

.page-about .rail-year {
  color: var(--gold);
  font-weight: 700;
  letter-spacing: 0.04em;
  flex: 0 0 auto;
}

.page-about .rail-label {
  color: inherit;
  opacity: 0.86;
}

.page-about .rail-big {
  margin: 0;
  font-size: var(--fs-700);
  font-weight: 700;
  line-height: 1;
  color: var(--white);
  font-variant-numeric: tabular-nums;
}

.page-about .rail-note {
  margin: 10px 0 0;
  font-size: var(--fs-200);
  line-height: 1.75;
  color: var(--dim);
}

.page-about .rail-link {
  display: inline-block;
  margin-top: 12px;
  font-size: var(--fs-200);
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 214, 0.35);
  padding-bottom: 2px;
  transition: border-color 0.25s ease, color 0.25s ease;
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--glow);
  border-color: var(--glow);
}

/* ---------- 延伸入口 ---------- */

.page-about .about-next {
  border-top: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(58, 46, 92, 0.36), rgba(6, 13, 26, 0));
  padding: clamp(40px, 6vw, 72px) 0 clamp(48px, 7vw, 84px);
}

.page-about .about-next-title {
  margin: 0 0 clamp(18px, 3vw, 28px);
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 2.6vw, 1.75rem);
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.015em;
}

.page-about .next-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .next-card a {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(16px, 2.4vw, 22px);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: rgba(14, 27, 49, 0.7);
  text-decoration: none;
  transition: border-color 0.3s ease, transform 0.3s ease, background 0.3s ease;
}

.page-about .next-card a:hover,
.page-about .next-card a:focus-visible {
  border-color: rgba(53, 224, 214, 0.5);
  background: rgba(14, 27, 49, 0.95);
  transform: translateY(-3px);
}

.page-about .next-kicker {
  font-size: var(--fs-100);
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .next-text {
  font-size: var(--fs-200);
  line-height: 1.7;
  color: var(--dim-strong);
}

/* ---------- 响应式 ---------- */

@media (min-width: 560px) {
  .page-about .viz-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 640px) {
  .page-about .shift-row {
    grid-template-columns: 96px minmax(0, 1fr) 128px;
    grid-template-areas: "name track time";
    gap: 12px;
  }

  .page-about .shift-name {
    white-space: normal;
  }
}

@media (min-width: 760px) {
  .page-about .about-stripe-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 960px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }

  .page-about .about-hero-visual {
    margin-top: 30px;
  }

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

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 1fr) 272px;
    gap: clamp(38px, 4vw, 60px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
    align-self: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .split-svg rect {
    animation: none;
    transform: none;
  }

  .page-about .era-card,
  .page-about .era-item::before,
  .page-about .viz-card,
  .page-about .shift-fill,
  .page-about .next-card a,
  .page-about .rail-years a {
    transition: none;
  }

  .page-about .viz-card:hover,
  .page-about .next-card a:hover,
  .page-about .next-card a:focus-visible {
    transform: none;
  }
}

.page-about {
  --from: 1rem;
  --to: 1rem;
}