.page-about {
  --about-pad-y: clamp(52px, 8vw, 104px);
  --about-gap: clamp(20px, 3vw, 34px);
  background: var(--ink);
  color: var(--mist);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about * {
  box-sizing: border-box;
}

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

.page-about a {
  color: inherit;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4.5vw, 52px) 0 clamp(38px, 6vw, 72px);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(198, 255, 61, 0.10), transparent 62%),
    var(--ink);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(242, 247, 244, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(242, 247, 244, 0.05) 1px, transparent 1px);
  background-size: 88px 88px;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 72%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 72%);
}

.page-about .about-hero-frame {
  position: relative;
  z-index: 1;
  border: 1px solid var(--line);
  padding: clamp(18px, 3.4vw, 44px);
  background: linear-gradient(160deg, rgba(12, 31, 25, 0.78), rgba(6, 17, 14, 0.24));
}

.page-about .about-hero-frame::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 14%;
  bottom: 14%;
  width: 5px;
  background: repeating-linear-gradient(180deg, var(--lime) 0 2px, transparent 2px 13px);
}

.page-about .about-crumbs ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--ash);
}

.page-about .about-crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(242, 247, 244, 0.30);
}

.page-about .about-crumbs a {
  text-decoration: none;
  color: var(--ash);
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
}

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

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 3vw, 30px);
  margin-top: clamp(18px, 3vw, 30px);
}

.page-about .about-vert {
  display: none;
  margin: 0;
}

.page-about .about-kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.24em;
  color: var(--lime);
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 0;
  max-width: 19ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(29px, 5.3vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-lead {
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: rgba(242, 247, 244, 0.82);
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(22px, 3.6vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stats li {
  background: var(--panel);
  padding: 16px 14px 18px;
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(23px, 3.2vw, 33px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .stat-label {
  display: block;
  margin-top: 9px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--ash);
}

/* ---------- 章节头通用 ---------- */

.page-about .about-chapter {
  margin: 0 0 clamp(28px, 4.4vw, 52px);
}

.page-about .chapter-kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.26em;
  color: var(--ash);
}

.page-about .chapter-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(50px, 8.6vw, 100px);
  font-weight: 600;
  line-height: 0.84;
  letter-spacing: -0.05em;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .chapter-title {
  margin: 16px 0 0;
  max-width: 24ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.5vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-chapter-note {
  margin: 12px 0 0;
  max-width: 50ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ash);
}

/* ---------- 01 编年史 ---------- */

.page-about .about-era {
  position: relative;
  padding: var(--about-pad-y) 0;
  background: var(--panel);
  overflow: hidden;
}

.page-about .era-tex {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.12;
  pointer-events: none;
}

.page-about .about-era > .wrap {
  position: relative;
  z-index: 1;
}

.page-about .era-band {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-soft);
  border-top: 1px solid var(--line);
}

.page-about .era-item {
  position: relative;
  background: rgba(6, 17, 14, 0.88);
  padding: clamp(20px, 2.6vw, 28px) clamp(16px, 2vw, 22px) clamp(22px, 3vw, 32px);
  transition: transform var(--t-mid), background var(--t-mid);
}

.page-about .era-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 3px;
  width: var(--fill, 25%);
  background: var(--lime);
  transition: width var(--t-mid);
}

.page-about .era-item:nth-child(2) { --fill: 50%; }
.page-about .era-item:nth-child(3) { --fill: 75%; }
.page-about .era-item:nth-child(4) { --fill: 100%; }

.page-about .era-item:hover,
.page-about .era-item:focus-within {
  transform: translateY(-10px);
  background: var(--raise);
}

.page-about .era-item:hover::before,
.page-about .era-item:focus-within::before {
  width: 100%;
}

.page-about .era-year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--ash);
  font-variant-numeric: tabular-nums;
}

.page-about .era-ver {
  margin: 7px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--lime);
}

.page-about .era-name {
  margin: 12px 0 0;
  font-size: clamp(16.5px, 1.9vw, 20px);
  font-weight: 800;
  line-height: 1.38;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .era-desc {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(242, 247, 244, 0.74);
}

.page-about .era-note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--ash);
}

/* ---------- 02 班组 ---------- */

.page-about .about-team {
  padding: var(--about-pad-y) 0;
  background: var(--ink);
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 46px);
  align-items: start;
}

.page-about .team-lead {
  margin: 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.9;
  color: rgba(242, 247, 244, 0.8);
}

.page-about .team-dial {
  margin-top: clamp(24px, 4vw, 36px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  padding: clamp(18px, 2.6vw, 26px);
  border: 1px solid var(--line);
  border-left: 3px solid var(--lime);
  background: var(--panel);
}

.page-about .dial {
  display: block;
  width: 100%;
  max-width: 178px;
  height: auto;
  margin: 0 auto;
}

.page-about .dial-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.page-about .dial-legend li {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  font-size: 13.5px;
  color: rgba(242, 247, 244, 0.82);
}

.page-about .dial-dot {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  display: block;
}

.page-about .dial-dot--lime { background: var(--lime); }
.page-about .dial-dot--mist { background: var(--mist); }
.page-about .dial-dot--ash { background: var(--ash); }
.page-about .dial-dot--soft { background: rgba(198, 255, 61, 0.45); }

.page-about .dial-pct {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .team-figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
  aspect-ratio: auto;
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .team-figure figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 26px 16px 14px;
  font-size: 12.5px;
  line-height: 1.65;
  color: rgba(242, 247, 244, 0.88);
  background: linear-gradient(180deg, transparent, rgba(6, 17, 14, 0.94));
}

.page-about .team-roles {
  margin-top: clamp(28px, 4.4vw, 48px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .role {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 0 clamp(16px, 2vw, 22px);
  transition: border-color var(--t-fast), background var(--t-fast);
}

.page-about .role[open] {
  border-color: rgba(198, 255, 61, 0.42);
  background: var(--raise);
}

.page-about .role summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 16px 0;
}

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

.page-about .role summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--lime);
}

.page-about .role[open] summary::after {
  content: "–";
}

.page-about .role-name {
  flex: 1 1 auto;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.01em;
}

.page-about .role-count {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--ash);
  font-variant-numeric: tabular-nums;
}

.page-about .role p {
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(242, 247, 244, 0.76);
}

/* ---------- 03 场馆现场 ---------- */

.page-about .about-field {
  position: relative;
  padding: 0 0 var(--about-pad-y);
  background: var(--ink);
}

.page-about .field-figure {
  position: relative;
  margin: 0 0 clamp(28px, 4.4vw, 48px);
  clip-path: polygon(0 7%, 100% 0, 100% 100%, 0 100%);
}

.page-about .field-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .field-figure figcaption {
  position: absolute;
  left: clamp(16px, 5vw, 64px);
  bottom: clamp(14px, 3vw, 30px);
  padding-left: 12px;
  border-left: 2px solid var(--lime);
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: rgba(242, 247, 244, 0.86);
}

.page-about .about-field-prose {
  margin: 0;
  max-width: 66ch;
  font-size: 15.5px;
  line-height: 1.9;
  color: rgba(242, 247, 244, 0.8);
}

.page-about .field-stats {
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .field-stats li {
  background: var(--panel);
  padding: clamp(15px, 2.2vw, 23px);
}

.page-about .league-block {
  margin-top: clamp(26px, 4vw, 40px);
  padding: clamp(18px, 2.8vw, 26px);
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .league-title {
  margin: 0 0 16px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .league-bars {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  max-width: 560px;
}

.page-about .league-bars li {
  display: grid;
  grid-template-columns: 60px minmax(0, 1fr) 52px;
  gap: 12px;
  align-items: center;
  font-size: 13px;
  color: rgba(242, 247, 244, 0.8);
}

.page-about .lb-bar {
  position: relative;
  display: block;
  height: 8px;
  border-radius: 2px;
  background: var(--raise);
  overflow: hidden;
}

.page-about .lb-bar::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: var(--v, 50%);
  background: var(--lime);
}

.page-about .league-bars li:nth-child(1) .lb-bar { --v: 100%; }
.page-about .league-bars li:nth-child(2) .lb-bar { --v: 58%; }
.page-about .league-bars li:nth-child(3) .lb-bar { --v: 33%; }
.page-about .league-bars li:nth-child(4) .lb-bar { --v: 25%; }

.page-about .lb-num {
  text-align: right;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

/* ---------- 04 原则：白底反色 ---------- */

.page-about .about-principles {
  padding: var(--about-pad-y) 0;
  background: var(--white);
  color: var(--ink);
}

.page-about .about-principles .chapter-kicker {
  color: #55655F;
}

.page-about .about-principles .chapter-num {
  display: inline-block;
  padding: 6px 14px 2px;
  background: var(--lime);
  color: var(--on-lime);
  line-height: 1;
  letter-spacing: -0.03em;
}

.page-about .about-principles .chapter-title {
  color: var(--ink);
}

.page-about .about-principles .about-chapter-note {
  color: #4A5952;
}

.page-about .principle-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 32px);
}

.page-about .principle-item {
  border-top: 3px solid var(--ink);
  padding-top: 18px;
}

.page-about .principle-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: #55655F;
  font-variant-numeric: tabular-nums;
}

.page-about .principle-item h3 {
  margin: 12px 0 0;
  font-size: clamp(19px, 2.4vw, 26px);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .principle-item p {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.9;
  color: #33413B;
}

/* ---------- 05 生态 ---------- */

.page-about .about-eco {
  padding: var(--about-pad-y) 0;
  background: var(--ink);
}

.page-about .eco-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.6vw, 24px);
}

.page-about .eco-card {
  position: relative;
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .eco-card::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 8px;
  height: 8px;
  background: var(--lime);
}

.page-about .eco-card-title {
  margin: 14px 0 0;
  font-size: clamp(18px, 2.3vw, 23px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .eco-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .eco-list li {
  padding-left: 14px;
  border-left: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.85;
  color: rgba(242, 247, 244, 0.76);
}

.page-about .eco-list strong {
  display: block;
  margin-bottom: 4px;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--lime);
}

.page-about .eco-side {
  display: grid;
  gap: clamp(16px, 2.6vw, 24px);
  align-content: start;
}

.page-about .eco-award {
  padding: clamp(18px, 2.6vw, 26px);
  border: 1px solid var(--line);
  border-top: 2px solid rgba(198, 255, 61, 0.5);
  background: rgba(12, 31, 25, 0.7);
}

.page-about .eco-award-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--lime);
}

.page-about .eco-award h3 {
  margin: 10px 0 0;
  font-size: 16.5px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--white);
}

.page-about .eco-award p:not(.eco-award-label) {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ash);
}

.page-about .eco-links {
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .eco-links a {
  display: inline-flex;
  align-items: center;
  padding: 10px 16px;
  border: 1px solid var(--line);
  font-size: 13.5px;
  text-decoration: none;
  color: rgba(242, 247, 244, 0.86);
  transition: border-color var(--t-fast), color var(--t-fast), background var(--t-fast);
}

.page-about .eco-links a:hover,
.page-about .eco-links a:focus-visible {
  border-color: var(--lime);
  color: var(--lime);
  background: rgba(198, 255, 61, 0.06);
}

/* ---------- 收束 ---------- */

.page-about .about-close {
  position: relative;
  padding: 0 0 clamp(52px, 8vw, 92px);
  background: var(--ink);
}

.page-about .about-close-line {
  height: 4px;
  width: 100%;
  background: linear-gradient(90deg, var(--lime) 0%, var(--lime) 62%, rgba(198, 255, 61, 0.18) 100%);
}

.page-about .about-close-inner {
  padding-top: clamp(30px, 5vw, 54px);
}

.page-about .about-close h2 {
  margin: 0;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 4.3vw, 46px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-close p {
  margin: 14px 0 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ash);
}

.page-about .about-close-actions {
  margin-top: clamp(22px, 3.4vw, 34px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-close-actions a {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .team-dial {
    grid-template-columns: 180px minmax(0, 1fr);
    align-items: center;
  }

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

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

  .page-about .field-figure img {
    aspect-ratio: 16 / 9;
  }

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

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

@media (min-width: 860px) {
  .page-about .about-hero-grid {
    grid-template-columns: 46px minmax(0, 1fr);
    gap: 30px;
  }

  .page-about .about-vert {
    display: block;
    writing-mode: vertical-rl;
    padding-right: 14px;
    border-right: 1px solid var(--line);
    font-size: 12px;
    letter-spacing: 0.42em;
    color: var(--ash);
    height: fit-content;
  }

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

@media (min-width: 900px) {
  .page-about .era-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    gap: clamp(32px, 5vw, 68px);
  }

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

  .page-about .eco-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .era-item,
  .page-about .era-item::before,
  .page-about .role,
  .page-about .eco-links a {
    transition: none;
  }

  .page-about .era-item:hover,
  .page-about .era-item:focus-within {
    transform: none;
  }
}