/* ===== 品牌中心 / page-about ===== */

.page-about {
  background: var(--paper);
  color: var(--ink);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: 32px;
  padding-bottom: 36px;
}

.page-about .about-hero .crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--slate);
  margin-bottom: 30px;
  flex-wrap: wrap;
}

.page-about .about-hero .crumbs a {
  color: var(--route);
  text-decoration: none;
}

.page-about .about-hero .crumbs a:hover {
  color: var(--amber-ink);
}

.page-about .about-hero .crumbs-current {
  color: var(--ink);
  font-weight: 600;
}

.page-about .hero-grid {
  display: grid;
  gap: 34px;
}

.page-about .hero-copy {
  border-left: 4px solid var(--amber);
  padding-left: 20px;
}

.page-about .hero-copy .eyebrow {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--route);
  text-transform: uppercase;
}

.page-about .hero-copy h1 {
  margin: 0 0 20px;
  font-family: var(--display);
  font-weight: 800;
  font-size: 30px;
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--ink);
  max-width: 16em;
}

.page-about .hero-copy .lede {
  margin: 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .hero-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .hero-fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .hero-fact-value {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.page-about .hero-fact-label {
  font-size: 13px;
  color: var(--slate);
  text-align: right;
  line-height: 1.5;
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 48px;
    padding-bottom: 48px;
  }
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 64px;
    align-items: end;
  }
  .page-about .hero-copy h1 {
    font-size: 44px;
    line-height: 1.14;
  }
  .page-about .hero-copy .lede {
    font-size: 17px;
  }
}

/* ---------- 首屏横幅 ---------- */

.page-about .about-banner {
  margin-bottom: 0;
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 3;
  object-fit: cover;
  border-radius: var(--r-l);
  border: 1px solid var(--line);
}

.page-about .about-banner .media-caption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--slate);
}

/* ---------- 长卷骨架 ---------- */

.page-about .about-ledger {
  position: relative;
  padding: 64px 0 0 40px;
  margin-top: 24px;
}

.page-about .about-ledger::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 72px;
  bottom: 32px;
  width: 4px;
  border-radius: 2px;
  background: linear-gradient(
    180deg,
    var(--ink) 0%,
    var(--scroll) 38%,
    var(--route) 76%,
    rgba(46, 90, 143, 0.1) 100%
  );
}

.page-about .ledger-section {
  position: relative;
  padding-bottom: 68px;
}

.page-about .ledger-section:last-child {
  padding-bottom: 24px;
}

.page-about .ledger-section::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 5px var(--paper), 0 0 0 6px rgba(31, 59, 102, 0.24);
  transition: box-shadow 320ms var(--ease), background 320ms var(--ease);
}

.page-about .ledger-section.is-in::before {
  box-shadow: 0 0 0 5px var(--paper), 0 0 0 6px rgba(240, 135, 31, 0.42);
}

.page-about .ledger-section h2 {
  margin: 0 0 14px;
  font-family: var(--display);
  font-weight: 800;
  font-size: 24px;
  line-height: 1.28;
  letter-spacing: -0.02em;
  color: var(--ink);
  max-width: 18em;
}

.page-about .ledger-section .prose {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-2);
}

@media (min-width: 768px) {
  .page-about .ledger-section h2 {
    font-size: 30px;
  }
  .page-about .ledger-section .prose {
    font-size: 17px;
  }
}

/* ---------- 01 阶段 ---------- */

.page-about .stage-list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .stage {
  background: #fff;
  border: 1px solid var(--line);
  border-left: 3px solid var(--route);
  border-radius: var(--r-m);
  transition: border-color 240ms var(--ease), box-shadow 240ms var(--ease);
}

.page-about .stage[open] {
  border-left-color: var(--amber);
  box-shadow: var(--shadow);
}

.page-about .stage > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .stage > summary::marker {
  content: "";
}

.page-about .stage-era {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--amber-ink);
  background: rgba(240, 135, 31, 0.15);
  border-radius: var(--r-s);
  padding: 3px 9px;
  white-space: nowrap;
}

.page-about .stage-name {
  flex: 1 1 auto;
  font-family: var(--display);
  font-weight: 700;
  font-size: 17px;
  color: var(--ink);
}

.page-about .stage > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--mono);
  font-size: 19px;
  line-height: 1;
  color: var(--route);
  transition: color 240ms var(--ease);
}

.page-about .stage[open] > summary::after {
  content: "−";
  color: var(--amber-ink);
}

.page-about .stage-detail {
  padding: 0 18px 18px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .stage-detail p {
  margin: 0;
}

.page-about .ledger-figure {
  margin: 30px 0 0;
}

.page-about .ledger-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--r-l);
  border: 1px solid var(--line);
}

.page-about .ledger-figure .media-caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate);
}

/* ---------- 02 减法 ---------- */

.page-about .cut-list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .cut {
  background: #fff;
  border: 1px solid var(--line);
  border-top: 3px solid var(--scroll);
  border-radius: var(--r-m);
  padding: 22px 20px;
}

.page-about .cut h3 {
  margin: 14px 0 10px;
  font-family: var(--display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .cut p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .cut .tag {
  font-family: var(--mono);
  font-size: 12px;
}

@media (min-width: 860px) {
  .page-about .cut-list {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 22px;
  }
  .page-about .cut:nth-child(1) {
    grid-column: span 3;
  }
  .page-about .cut:nth-child(2) {
    grid-column: span 3;
  }
  .page-about .cut:nth-child(3) {
    grid-column: span 4;
  }
}

.page-about .route-link {
  margin: 26px 0 0;
  font-size: 15px;
}

.page-about .route-link a {
  color: var(--route);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 90, 143, 0.35);
  padding-bottom: 2px;
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .route-link a::after {
  content: " →";
  color: var(--amber);
}

.page-about .route-link a:hover {
  color: var(--amber-ink);
  border-bottom-color: var(--amber);
}

/* ---------- 03 规模 ---------- */

.page-about .scale-grid {
  list-style: none;
  margin: 30px 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  overflow: hidden;
}

.page-about .scale-grid > li {
  background: #fff;
  padding: 20px 18px;
}

.page-about .scale-value {
  display: block;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .scale-label {
  display: block;
  margin-top: 8px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--slate);
}

@media (min-width: 860px) {
  .page-about .scale-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .scale-grid > li {
    padding: 24px 22px;
  }
  .page-about .scale-value {
    font-size: 25px;
  }
}

.page-about .scale-note {
  margin: 24px 0 0;
  padding: 16px 20px;
  border-left: 3px solid var(--teal);
  border-radius: 0 var(--r-m) var(--r-m) 0;
  background: rgba(18, 165, 148, 0.07);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-2);
  max-width: 62ch;
}

/* ---------- 04 团队 ---------- */

.page-about .team-layout {
  display: grid;
  gap: 30px;
  margin-top: 30px;
}

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

.page-about .team-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  padding: 20px 18px;
  transition: border-color 240ms var(--ease), box-shadow 240ms var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  border-color: rgba(46, 90, 143, 0.42);
  box-shadow: var(--shadow);
}

.page-about .team-card:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

.page-about .team-num {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--route);
}

.page-about .team-card h3 {
  margin: 10px 0 10px;
  font-family: var(--display);
  font-weight: 700;
  font-size: 18px;
  color: var(--ink);
}

.page-about .team-card > p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .team-note {
  margin-top: 14px;
  padding-left: 12px;
  border-left: 2px solid var(--line-strong);
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--route);
  transition: border-color 240ms var(--ease), color 240ms var(--ease);
}

.page-about .team-card:hover .team-note,
.page-about .team-card:focus-within .team-note {
  border-left-color: var(--amber);
  color: var(--amber-ink);
}

.page-about .team-figure {
  margin: 0;
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--r-l);
  border: 1px solid var(--line);
}

.page-about .team-figure .media-caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate);
}

@media (min-width: 720px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.1fr) minmax(0, 1fr);
    gap: 16px;
    align-items: start;
  }
  .page-about .team-grid > .team-card:nth-child(2) {
    transform: translateY(24px);
  }
  .page-about .team-figure {
    margin-top: 40px;
  }
}

@media (min-width: 1100px) {
  .page-about .team-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 40px;
    align-items: start;
  }
  .page-about .team-figure {
    margin-top: 48px;
  }
}

/* ---------- 05 原则 ---------- */

.page-about .rule-list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .rule {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .rule-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--amber);
  color: var(--amber-ink);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0;
}

.page-about .rule h3 {
  margin: 4px 0 8px;
  font-family: var(--display);
  font-weight: 700;
  font-size: 18px;
  color: var(--ink);
}

.page-about .rule p {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate);
}

@media (min-width: 768px) {
  .page-about .rule {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 20px;
    padding: 28px 0;
  }
  .page-about .rule-list {
    margin-top: 34px;
  }
}

/* ---------- 下一步 ---------- */

.page-about .about-next {
  margin-top: 8px;
  margin-bottom: 80px;
  padding-top: 48px;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-next .eyebrow {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--route);
  text-transform: uppercase;
}

.page-about .about-next h2 {
  margin: 0 0 22px;
  font-family: var(--display);
  font-weight: 800;
  font-size: 22px;
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--ink);
}

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

.page-about .next-links a {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 20px;
  border-radius: var(--r-m);
  background: var(--ink);
  text-decoration: none;
  transition: background 240ms var(--ease), transform 240ms var(--ease);
}

.page-about .next-links a:hover {
  background: var(--ink-2);
  transform: translateY(-2px);
}

.page-about .next-link-title {
  font-family: var(--display);
  font-weight: 700;
  font-size: 17px;
  color: #fff;
}

.page-about .next-link-title::after {
  content: " →";
  color: var(--amber);
}

.page-about .next-link-desc {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--mist-dim);
}

@media (min-width: 780px) {
  .page-about .next-links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
  .page-about .about-next h2 {
    font-size: 26px;
  }
}

/* ---------- 窄屏收敛 ---------- */

@media (max-width: 480px) {
  .page-about .about-ledger {
    padding-left: 26px;
  }
  .page-about .about-ledger::before {
    left: 8px;
  }
  .page-about .ledger-section::before {
    left: -22px;
    width: 12px;
    height: 12px;
  }
  .page-about .hero-copy {
    padding-left: 16px;
  }
  .page-about .hero-copy h1 {
    font-size: 26px;
  }
  .page-about .scale-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ---------- 降低动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .ledger-section::before,
  .page-about .stage,
  .page-about .team-card,
  .page-about .team-note,
  .page-about .next-links a,
  .page-about .route-link a {
    transition: none;
  }
  .page-about .next-links a:hover {
    transform: none;
  }
  .page-about .team-grid > .team-card:nth-child(2) {
    transform: none;
  }
}