.page-about {
  --ab-gap: clamp(20px, 4vw, 40px);
  --ab-line: rgba(110, 140, 168, 0.22);
  --ab-rail: 76px;
  color: var(--c-ink);
  background:
    radial-gradient(1100px 560px at 88% -6%, rgba(56, 242, 208, 0.10), transparent 64%),
    radial-gradient(820px 480px at -12% 26%, rgba(255, 107, 74, 0.07), transparent 60%),
    var(--c-deep);
  overflow-x: clip;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about h2 {
  font-size: clamp(1.45rem, 4vw, 2.4rem);
  line-height: 1.22;
  letter-spacing: -0.015em;
  font-weight: 800;
  margin: 0 0 14px;
  color: var(--c-ink);
}

.page-about h3 {
  font-weight: 700;
  color: var(--c-ink);
}

.page-about .prose p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(234, 246, 255, 0.8);
  max-width: 66ch;
}

.page-about .prose p:last-child {
  margin-bottom: 0;
}

.page-about .ab-note {
  position: relative;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 14px 16px 14px 20px;
  border-left: 3px solid var(--c-coral);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  background: linear-gradient(90deg, rgba(255, 107, 74, 0.10), rgba(16, 46, 74, 0.35));
  font-size: 14px;
  line-height: 1.85;
  color: rgba(234, 246, 255, 0.78);
  max-width: 74ch;
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  padding-block: clamp(18px, 3vw, 30px) clamp(38px, 6vw, 70px);
  overflow: hidden;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  top: -22%;
  right: -14%;
  width: min(560px, 74vw);
  height: min(560px, 74vw);
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%, rgba(56, 242, 208, 0.20), transparent 62%);
  filter: blur(14px);
  pointer-events: none;
  z-index: 0;
}

.page-about .ab-hero .wrap {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--ab-gap);
  margin-top: clamp(16px, 3vw, 28px);
}

.page-about .ab-hero__lead h1 {
  font-size: clamp(2rem, 8vw, 4.1rem);
  line-height: 1.06;
  letter-spacing: -0.025em;
  font-weight: 800;
  margin: 10px 0 18px;
  color: var(--c-ink);
}

.page-about .ab-hero__sub {
  font-size: clamp(0.98rem, 2.4vw, 1.1rem);
  line-height: 1.85;
  color: var(--c-cyan-soft);
  max-width: 54ch;
  margin: 0 0 22px;
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-hero__card {
  position: relative;
  padding: clamp(20px, 3vw, 30px);
  border-radius: var(--radius-l);
  border: 1px solid rgba(56, 242, 208, 0.24);
  background: linear-gradient(165deg, rgba(16, 46, 74, 0.94), rgba(11, 35, 64, 0.8));
  box-shadow: var(--shadow-2);
}

.page-about .ab-hero__card::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: -9px;
  height: 14px;
  border-radius: 0 0 var(--radius-m) var(--radius-m);
  background: linear-gradient(90deg, rgba(56, 242, 208, 0.5), rgba(255, 107, 74, 0.4));
  opacity: 0.45;
  transform: skewX(-18deg);
  pointer-events: none;
}

.page-about .ab-hero__card-label {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--c-dim);
}

.page-about .ab-big {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(3rem, 10vw, 4.4rem);
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--c-cyan);
}

.page-about .ab-hero__card-desc {
  margin: 12px 0 18px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(234, 246, 255, 0.74);
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-hero__stats li {
  padding: 12px 14px;
  border-radius: var(--radius-s);
  background: rgba(6, 20, 38, 0.55);
  border: 1px solid rgba(110, 140, 168, 0.22);
}

.page-about .ab-hero__stats .mono {
  display: block;
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--c-gold);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-about .ab-hero__stats li > span:last-child {
  font-size: 12.5px;
  color: var(--c-dim);
}

.page-about .ab-index {
  margin-top: clamp(24px, 4vw, 42px);
  padding-top: 14px;
  border-top: 1px solid var(--ab-line);
  overflow-x: auto;
}

.page-about .ab-index ol {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0 2px 6px;
}

.page-about .ab-index a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 13px;
  border-radius: 999px;
  border: 1px solid rgba(110, 140, 168, 0.3);
  color: var(--c-dim);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .ab-index a .mono {
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--c-cyan);
}

.page-about .ab-index a:hover,
.page-about .ab-index a:focus-visible {
  color: var(--c-deep);
  background: var(--c-cyan);
  border-color: var(--c-cyan);
}

.page-about .ab-index a:hover .mono,
.page-about .ab-index a:focus-visible .mono {
  color: var(--c-deep);
}

/* ---------- 章节骨架 ---------- */

.page-about .chapter {
  border-top: 1px solid var(--ab-line);
  padding-block: clamp(36px, 6vw, 76px);
  scroll-margin-top: 110px;
}

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

.page-about .chapter__rail {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--c-cyan);
}

.page-about .chapter__num {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid rgba(56, 242, 208, 0.42);
  font-size: 12px;
  letter-spacing: 0.14em;
  line-height: 1.5;
  color: var(--c-cyan);
}

.page-about .chapter__vlabel {
  font-size: 11px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--c-dim);
  white-space: nowrap;
}

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

.page-about .chapter__kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-coral);
}

.page-about .chapter__lede {
  margin: 0 0 20px;
  font-size: clamp(0.98rem, 2.3vw, 1.1rem);
  line-height: 1.8;
  color: var(--c-cyan-soft);
  max-width: 60ch;
}

/* ---------- 图版 ---------- */

.page-about .ab-figure {
  margin: 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid rgba(56, 242, 208, 0.18);
  box-shadow: var(--shadow-1);
  background: rgba(11, 35, 64, 0.6);
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-figure--banner {
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .ab-figure--banner img {
  aspect-ratio: 4 / 3;
}

.page-about .ab-figure--profile img {
  aspect-ratio: 3 / 2;
}

.page-about .ab-figure--local img {
  aspect-ratio: 4 / 5;
}

/* ---------- 起点卡片 ---------- */

.page-about .origin-cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
}

.page-about .origin-card {
  padding: 18px 18px 20px;
  border-radius: var(--radius-m);
  border: 1px solid rgba(110, 140, 168, 0.26);
  border-top: 2px solid var(--c-cyan);
  background: linear-gradient(160deg, rgba(16, 46, 74, 0.86), rgba(11, 35, 64, 0.55));
}

.page-about .origin-card h3 {
  margin: 0 0 8px;
  font-size: 15px;
}

.page-about .origin-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(234, 246, 255, 0.72);
}

/* ---------- 球队档案 ---------- */

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

.page-about .profile-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .profile-list li {
  padding-bottom: 14px;
  border-bottom: 1px dashed rgba(110, 140, 168, 0.28);
}

.page-about .profile-list li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .profile-list__key {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-cyan);
}

.page-about .profile-list__key::before {
  content: "▍";
  color: var(--c-coral);
  margin-right: 4px;
}

.page-about .profile-list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(234, 246, 255, 0.76);
}

/* ---------- 版本时间线 ---------- */

.page-about .tl {
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .tl-nodes {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  list-style: none;
  margin: 0 0 clamp(20px, 3vw, 32px);
  padding: 0;
}

.page-about .tl-node {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 12px;
  border-radius: var(--radius-m);
  border: 1px solid rgba(110, 140, 168, 0.28);
  background: rgba(16, 46, 74, 0.5);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .tl-node__v {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.03em;
  color: var(--c-gold);
}

.page-about .tl-node__l {
  font-size: 13px;
  color: var(--c-dim);
}

.page-about .tl-node:hover,
.page-about .tl-node:focus-visible {
  border-color: var(--c-cyan);
  transform: translateY(-2px);
}

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

.page-about .tl-stage {
  padding: 18px 20px;
  border-radius: var(--radius-m);
  border: 1px solid rgba(110, 140, 168, 0.24);
  border-left: 3px solid rgba(56, 242, 208, 0.4);
  background: rgba(11, 35, 64, 0.55);
  scroll-margin-top: 110px;
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .tl-stage:target {
  border-color: var(--c-cyan);
  border-left-color: var(--c-coral);
  background: linear-gradient(150deg, rgba(56, 242, 208, 0.14), rgba(16, 46, 74, 0.7));
  box-shadow: 0 0 0 1px rgba(56, 242, 208, 0.26), var(--shadow-1);
}

.page-about .tl-stage h3 {
  margin: 0 0 8px;
  font-size: 16px;
  line-height: 1.4;
}

.page-about .tl-stage p {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: rgba(234, 246, 255, 0.75);
}

/* ---------- 团队 ---------- */

.page-about .crew-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: clamp(16px, 3vw, 26px);
}

.page-about .crew-card {
  position: relative;
  padding: 20px 20px 22px;
  border-radius: var(--radius-m);
  border: 1px solid rgba(110, 140, 168, 0.22);
  background: linear-gradient(155deg, rgba(16, 46, 74, 0.9), rgba(11, 35, 64, 0.6));
}

.page-about .crew-card__idx {
  position: absolute;
  top: 14px;
  right: 16px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: rgba(110, 140, 168, 0.85);
}

.page-about .crew-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  color: var(--c-cyan-soft);
}

.page-about .crew-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(234, 246, 255, 0.74);
}

.page-about .crew-stats {
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  border-top: 1px solid var(--ab-line);
}

.page-about .crew-stats li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 2px;
  border-bottom: 1px dashed rgba(110, 140, 168, 0.26);
}

.page-about .crew-stats .mono {
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1.2;
  color: var(--c-coral);
  min-width: 84px;
}

.page-about .crew-stats li > span:last-child {
  font-size: 13.5px;
  color: var(--c-dim);
}

/* ---------- 地方协作 ---------- */

.page-about .local-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--ab-gap);
  margin-top: clamp(16px, 3vw, 26px);
}

.page-about .local-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
}

.page-about .local-stats li {
  padding: 14px 16px;
  border-radius: var(--radius-s);
  background: rgba(16, 46, 74, 0.62);
  border: 1px solid rgba(110, 140, 168, 0.22);
}

.page-about .local-stats .mono {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1.15;
  color: var(--c-gold);
}

.page-about .local-stats li > span:last-child {
  font-size: 12.5px;
  color: var(--c-dim);
}

/* ---------- 维护节奏 ---------- */

.page-about .rhythm {
  list-style: none;
  margin: clamp(16px, 3vw, 26px) 0 0;
  padding: 0;
}

.page-about .rhythm li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 0;
  border-top: 1px dashed rgba(110, 140, 168, 0.26);
}

.page-about .rhythm li:first-child {
  border-top: 1px solid rgba(56, 242, 208, 0.3);
}

.page-about .rhythm__when {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--c-coral);
}

.page-about .rhythm li p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: rgba(234, 246, 255, 0.78);
  max-width: 64ch;
}

/* ---------- 收尾 ---------- */

.page-about .ab-cta {
  padding-block: clamp(30px, 5vw, 60px) clamp(44px, 7vw, 92px);
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-cta__panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  padding: clamp(22px, 4vw, 40px);
  border-radius: var(--radius-l);
  border: 1px solid rgba(56, 242, 208, 0.2);
  background:
    radial-gradient(80% 120% at 100% 0%, rgba(56, 242, 208, 0.14), transparent 62%),
    linear-gradient(150deg, rgba(16, 46, 74, 0.95), rgba(11, 35, 64, 0.75));
  box-shadow: var(--shadow-1);
}

.page-about .ab-cta__copy h2 {
  font-size: clamp(1.3rem, 3.4vw, 1.9rem);
  margin-bottom: 10px;
}

.page-about .ab-cta__copy p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(234, 246, 255, 0.76);
  max-width: 52ch;
}

.page-about .ab-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .origin-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

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

  .page-about .crew-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
    border-top: none;
  }

  .page-about .crew-stats li {
    flex-direction: column;
    gap: 4px;
    border-top: 1px solid rgba(56, 242, 208, 0.28);
    border-bottom: none;
    padding-top: 12px;
  }

  .page-about .rhythm li {
    grid-template-columns: 116px minmax(0, 1fr);
    gap: 18px;
    align-items: start;
  }

  .page-about .ab-cta__panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .profile-list li {
    display: grid;
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }

  .page-about .profile-list__key {
    margin-bottom: 0;
  }
}

@media (min-width: 760px) {
  .page-about .tl-nodes {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    padding-top: 8px;
  }

  .page-about .tl-nodes::before {
    content: "";
    position: absolute;
    top: 20px;
    left: 6%;
    right: 6%;
    height: 1px;
    background: linear-gradient(90deg, rgba(56, 242, 208, 0.12), var(--c-cyan), rgba(56, 242, 208, 0.12));
  }

  .page-about .tl-node {
    position: relative;
    align-items: center;
    text-align: center;
    padding: 34px 8px 4px;
    border-color: transparent;
    background: transparent;
  }

  .page-about .tl-node::before {
    content: "";
    position: absolute;
    top: 5px;
    left: 50%;
    transform: translateX(-50%);
    width: 13px;
    height: 13px;
    border-radius: 50%;
    background: var(--c-deep);
    border: 2px solid var(--c-cyan);
    box-shadow: 0 0 0 5px rgba(56, 242, 208, 0.1);
  }

  .page-about .tl-node:hover,
  .page-about .tl-node:focus-visible {
    transform: none;
    border-color: transparent;
  }

  .page-about .tl-node:hover .tl-node__v,
  .page-about .tl-node:focus-visible .tl-node__v {
    color: var(--c-cyan);
  }

  .page-about .tl-node:hover .tl-node__l,
  .page-about .tl-node:focus-visible .tl-node__l {
    color: var(--c-ink);
  }
}

@media (min-width: 900px) {
  .page-about .chapter__grid {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: clamp(22px, 3.5vw, 52px);
    align-items: start;
  }

  .page-about .chapter__rail {
    position: relative;
    align-self: stretch;
    flex-direction: column;
    align-items: center;
    gap: 18px;
    padding-top: 4px;
  }

  .page-about .chapter__rail::after {
    content: "";
    position: absolute;
    top: 40px;
    bottom: 4px;
    left: 50%;
    width: 1px;
    transform: translateX(-50%);
    background: linear-gradient(180deg, rgba(56, 242, 208, 0.55), rgba(56, 242, 208, 0.04));
  }

  .page-about .chapter__vlabel {
    writing-mode: vertical-rl;
    text-orientation: mixed;
  }

  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, 0.82fr);
    align-items: end;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .profile-grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    align-items: start;
    gap: clamp(24px, 4vw, 48px);
  }

  .page-about .local-grid {
    grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.28fr);
    align-items: start;
    gap: clamp(24px, 4vw, 52px);
  }
}

@media (min-width: 1080px) {
  .page-about .ab-hero__sub {
    font-size: 1.12rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-node,
  .page-about .tl-stage,
  .page-about .ab-index a {
    transition: none;
  }

  .page-about .tl-node:hover,
  .page-about .tl-node:focus-visible {
    transform: none;
  }
}