/* ===== 品牌文化页 · page-about ===== */
.page-about {
  --about-gap: clamp(24px, 4vw, 56px);
  padding-bottom: clamp(64px, 9vw, 112px);
}

/* --- 页头 --- */
.page-about .breadcrumbs {
  margin: 0 0 20px;
}
.page-about .page-head {
  position: relative;
  padding: clamp(104px, 14vw, 168px) 0 clamp(34px, 5vw, 58px);
}
.page-about .page-head::before {
  content: "";
  position: absolute;
  left: -8%;
  right: -8%;
  top: 0;
  height: 460px;
  pointer-events: none;
  background:
    radial-gradient(52% 82% at 18% 6%, rgba(63, 224, 206, .12), transparent 68%),
    radial-gradient(46% 76% at 88% 0%, rgba(201, 162, 39, .14), transparent 70%);
}
.page-about .page-head > * {
  position: relative;
}
.page-about .page-head .eyebrow {
  display: block;
  margin: 0 0 18px;
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--gold-soft);
}
.page-about .page-head__title {
  margin: 0 0 22px;
  max-width: 18em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(36px, 6.4vw, 82px);
  line-height: 1.07;
  letter-spacing: -.025em;
  color: var(--paper);
}
.page-about .page-head__lead {
  margin: 0;
  max-width: 40em;
  font-size: clamp(15px, 1.2vw, 18px);
  line-height: 1.85;
  color: var(--paper-2);
}

/* --- 双栏骨架 --- */
.page-about .about-shell {
  display: block;
}
.page-about .about-rail {
  margin-bottom: 36px;
}
.page-about .about-rail__label {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--rock);
}
.page-about .about-rail__list {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  border-left: 1px solid var(--gold-line);
}
.page-about .about-rail__item {
  margin: 0;
}
.page-about .about-rail__link {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 9px 0 9px 14px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  font-size: 15px;
  color: var(--muted);
  text-decoration: none;
  transition: color .2s ease, border-color .2s ease, background-color .2s ease;
}
.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--paper);
  border-left-color: var(--cyan);
  background: rgba(63, 224, 206, .05);
}
.page-about .about-rail__idx {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--gold);
}
.page-about .about-rail__foot {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 18px;
  border-top: 1px dashed var(--gold-line);
}
.page-about .about-rail__hint {
  flex: 0 0 100%;
  margin: 0 0 2px;
  font-size: 13px;
  color: var(--rock);
}

@media (min-width: 900px) {
  .page-about .about-shell {
    display: grid;
    grid-template-columns: 216px minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }
  .page-about .about-rail {
    position: sticky;
    top: 96px;
    margin-bottom: 0;
  }
  .page-about .about-p {
    font-size: 17px;
  }
}

/* --- 章节 --- */
.page-about .about-section {
  position: relative;
  margin-top: clamp(52px, 7vw, 92px);
  padding-top: 32px;
  border-top: 1px solid var(--gold-line);
  scroll-margin-top: 110px;
}
.page-about .about-stream > .about-section:first-child {
  margin-top: 0;
}
.page-about .about-section > * {
  position: relative;
  z-index: 1;
}
.page-about .about-ghost {
  position: absolute;
  top: -6px;
  right: 0;
  z-index: 0;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(72px, 12vw, 136px);
  line-height: .8;
  letter-spacing: -.05em;
  color: rgba(201, 162, 39, .07);
  pointer-events: none;
  user-select: none;
}
.page-about .about-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: 0 0 22px;
}
.page-about .about-head__num {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold);
  border: 1px solid var(--gold-line);
  border-radius: 2px;
  padding: 3px 9px;
}
.page-about .about-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3vw, 34px);
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--paper);
}
.page-about .about-p {
  margin: 0 0 18px;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--paper-2);
}
.page-about .about-p a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* --- 01 起点 --- */
.page-about .story-grid {
  display: grid;
  gap: 26px;
}
.page-about .story-figure {
  margin: 0;
}
.page-about .origin-meta {
  margin: 26px 0 0;
  padding: 18px 22px;
  background: rgba(19, 39, 61, .74);
  border: 1px solid var(--gold-line);
  border-radius: var(--radius);
}
.page-about .origin-meta__row {
  display: grid;
  grid-template-columns: 5.5em minmax(0, 1fr);
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px dashed rgba(201, 162, 39, .18);
}
.page-about .origin-meta__row:last-child {
  border-bottom: 0;
}
.page-about .origin-meta dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--gold);
}
.page-about .origin-meta dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--paper-2);
}

/* --- 02 栏目体系 --- */
.page-about .cat-groups {
  display: grid;
  gap: 16px;
  margin: 26px 0 28px;
}
.page-about .cat-group {
  position: relative;
  padding: 20px 22px;
  background: var(--ink-2);
  border: 1px solid rgba(198, 210, 223, .1);
  border-left: 3px solid var(--cat, var(--gold));
  border-radius: var(--radius);
  transition: transform .3s ease, box-shadow .3s ease;
}
.page-about .cat-group:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 34px rgba(0, 0, 0, .42);
}
.page-about .cat-dot {
  display: inline-block;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cat, var(--gold));
  box-shadow: 0 0 0 3px rgba(255, 255, 255, .06);
}
.page-about .cat-group__title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}
.page-about .cat-group__names {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.9;
  letter-spacing: .02em;
  color: var(--paper-2);
}

/* --- 03 版本时间线 --- */
.page-about .tl-track {
  position: relative;
  display: grid;
  gap: 14px;
  margin-top: 6px;
}
.page-about .tl-node {
  position: relative;
  padding: 20px 22px;
  background: var(--ink-2);
  border: 1px solid rgba(198, 210, 223, .1);
  border-radius: var(--radius);
  transition: border-color .25s ease, box-shadow .25s ease;
}
.page-about .tl-node[open] {
  border-color: var(--gold-line);
  box-shadow: 0 14px 34px rgba(0, 0, 0, .4);
}
.page-about .tl-node__dot {
  display: none;
  position: absolute;
  top: -21px;
  left: 22px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(201, 162, 39, .16);
}
.page-about .tl-node__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  list-style: none;
  cursor: pointer;
}
.page-about .tl-node__summary::-webkit-details-marker {
  display: none;
}
.page-about .tl-node__summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}
.page-about .tl-node__ver {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--ink);
  background: var(--gold);
  border-radius: 2px;
  padding: 3px 9px;
}
.page-about .tl-node__name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}
.page-about .tl-node__hint {
  margin-left: auto;
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--cyan);
}
.page-about .tl-node__hint::after {
  content: "展开";
}
.page-about .tl-node[open] .tl-node__hint::after {
  content: "收起";
}
.page-about .tl-node__lead {
  flex: 1 1 100%;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}
.page-about .tl-node__body {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed rgba(201, 162, 39, .2);
}
.page-about .tl-node__body p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--paper-2);
}
.page-about .tl-node__body a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.page-about .tl-node__points {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .tl-node__points li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .tl-node__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .74em;
  width: 8px;
  height: 1px;
  background: var(--gold);
}

/* --- 04 规模 --- */
.page-about .scale-panel {
  position: relative;
  overflow: hidden;
  margin: 6px 0 26px;
  padding: clamp(24px, 3.4vw, 38px);
  border: 1px solid var(--gold-line);
  border-radius: var(--radius);
  background: linear-gradient(150deg, var(--ink-2) 0%, var(--ink-3) 52%, var(--ink-2) 100%);
}
.page-about .scale-panel::after {
  content: "";
  position: absolute;
  right: -60px;
  top: -60px;
  width: 240px;
  height: 240px;
  pointer-events: none;
  background: radial-gradient(circle, rgba(63, 224, 206, .18), transparent 68%);
}
.page-about .stat-grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 18px;
}
.page-about .stat {
  padding-left: 15px;
  border-left: 2px solid rgba(201, 162, 39, .5);
}
.page-about .stat-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(28px, 3.6vw, 42px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--gold-soft);
}
.page-about .stat-unit {
  margin-left: 5px;
  font-size: 13px;
  color: var(--gold);
}
.page-about .stat-label {
  margin: 9px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* --- 05 团队 --- */
.page-about .team-grid {
  display: grid;
  gap: 16px;
  margin: 22px 0 26px;
}
.page-about .team-card {
  padding: 22px;
  background: rgba(19, 39, 61, .74);
  border: 1px solid rgba(198, 210, 223, .1);
  border-top: 3px solid var(--cat, var(--gold));
  border-radius: var(--radius);
  transition: transform .3s ease, box-shadow .3s ease;
}
.page-about .team-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 34px rgba(0, 0, 0, .42);
}
.page-about .team-card__role {
  display: block;
  margin-bottom: 10px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--gold);
}
.page-about .team-card__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}
.page-about .team-card__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--paper-2);
}
.page-about .team-card__text a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.page-about .about-section .media-frame {
  margin: 4px 0 0;
}

/* --- 收尾入口 --- */
.page-about .about-cta {
  margin-top: clamp(52px, 7vw, 92px);
  padding: clamp(26px, 4vw, 40px);
  border: 1px solid var(--gold-line);
  border-radius: var(--radius);
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(63, 224, 206, .1), transparent 60%),
    var(--ink-2);
}
.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.4vw, 26px);
  color: var(--paper);
}
.page-about .about-cta__text {
  margin: 0 0 22px;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--paper-2);
}
.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* --- 响应式 --- */
@media (min-width: 720px) {
  .page-about .cat-groups {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (min-width: 760px) {
  .page-about .stat-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
  }
}
@media (min-width: 880px) {
  .page-about .story-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    gap: 40px;
    align-items: start;
  }
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .tl-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
    align-items: start;
    padding-top: 30px;
  }
  .page-about .tl-track::before {
    content: "";
    position: absolute;
    left: 4px;
    right: 4px;
    top: 14px;
    height: 1px;
    opacity: .75;
    background: linear-gradient(90deg, rgba(201, 162, 39, .15), var(--gold) 12%, var(--gold) 88%, rgba(201, 162, 39, .15));
  }
  .page-about .tl-node__dot {
    display: block;
  }
}
@media (prefers-reduced-motion: reduce) {
  .page-about .cat-group,
  .page-about .team-card,
  .page-about .tl-node,
  .page-about .about-rail__link {
    transition: none;
  }
  .page-about .cat-group:hover,
  .page-about .team-card:hover {
    transform: none;
  }
}