/* ===== 品牌中心 · page-about ===== */

.page-about {
  --about-spine-x: 20px;
  --about-gutter: 54px;
  --about-node-size: 13px;
  background: var(--deep-space);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(32px, 6vw, 72px) 0 clamp(28px, 5vw, 52px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -32%;
  right: -14%;
  width: 64%;
  height: 158%;
  background:
    linear-gradient(142deg,
      rgba(123, 92, 255, .26) 0%,
      rgba(58, 46, 122, .22) 34%,
      rgba(0, 224, 198, .13) 58%,
      rgba(11, 16, 38, 0) 76%);
  clip-path: polygon(24% 0, 100% 0, 100% 100%, 0 84%);
  pointer-events: none;
}

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

.page-about .breadcrumb {
  margin-bottom: clamp(22px, 3.5vw, 38px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 5vw, 52px);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.7fr) minmax(250px, .8fr);
    align-items: end;
  }
}

.page-about .about-hero__text h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.2vw, 54px);
  line-height: 1.18;
  letter-spacing: .01em;
  color: var(--star-white);
  max-width: 18em;
}

.page-about .about-hero__text .lede {
  margin-top: clamp(18px, 2.6vw, 26px);
  max-width: 38em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--mist-blue);
}

.page-about .about-hero__side {
  padding: 22px 22px 24px;
  border-left: 1px solid var(--galaxy-violet);
  background:
    linear-gradient(158deg, rgba(21, 27, 61, .92) 0%, rgba(21, 27, 61, .38) 62%, rgba(11, 16, 38, .08) 100%);
}

.page-about .about-hero__sidelabel {
  margin: 0 0 16px;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--nebula-cyan);
}

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

.page-about .about-stats dt {
  margin-bottom: 5px;
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--mist-blue);
}

.page-about .about-stats dd {
  margin: 0;
  font-size: clamp(18px, 2vw, 23px);
  color: var(--star-white);
  letter-spacing: .02em;
}

.page-about .about-index {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  margin-top: clamp(30px, 5vw, 54px);
  padding-top: 18px;
  border-top: 1px solid var(--grid-line);
}

.page-about .about-index a {
  position: relative;
  display: inline-block;
  padding-bottom: 3px;
  font-size: 14px;
  color: var(--mist-blue);
  text-decoration: none;
  transition: color .25s var(--ease);
}

.page-about .about-index a .mono {
  margin-right: 7px;
  font-size: 12px;
  color: var(--galaxy-violet);
}

.page-about .about-index a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 1px;
  background: var(--nebula-cyan);
  transition: width .3s var(--ease);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--star-white);
}

.page-about .about-index a:hover::after,
.page-about .about-index a:focus-visible::after {
  width: 100%;
}

/* ---------- 纵向坐标轴 ---------- */

.page-about .about-spine {
  position: relative;
  padding-bottom: clamp(40px, 7vw, 84px);
}

.page-about .about-spine::before {
  content: "";
  position: absolute;
  left: var(--about-spine-x);
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg,
    rgba(42, 52, 104, 0) 0,
    var(--grid-line) 56px,
    var(--grid-line) calc(100% - 56px),
    rgba(42, 52, 104, 0) 100%);
  pointer-events: none;
}

.page-about .spine-section {
  position: relative;
  padding: 0 0 clamp(44px, 6.5vw, 76px) var(--about-gutter);
}

.page-about .spine-section::before {
  content: "";
  position: absolute;
  left: calc(var(--about-spine-x) - 6px);
  top: 6px;
  width: var(--about-node-size);
  height: var(--about-node-size);
  border-radius: 50%;
  background: var(--deep-space);
  border: 1px solid var(--galaxy-violet);
  box-shadow: 0 0 0 4px rgba(123, 92, 255, .14);
  transition: border-color .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .spine-section::after {
  content: "";
  position: absolute;
  left: calc(var(--about-spine-x) + 7px);
  top: 12px;
  width: calc(var(--about-gutter) - var(--about-spine-x) - 14px);
  height: 1px;
  background: var(--grid-line);
  pointer-events: none;
}

.page-about .spine-section:hover::before,
.page-about .spine-section:focus-within::before {
  border-color: var(--nebula-cyan);
  box-shadow: 0 0 0 6px rgba(0, 224, 198, .14);
}

.page-about .spine-body {
  min-width: 0;
}

/* ---------- 章节排版 ---------- */

.page-about .eyebrow {
  display: inline-block;
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--nebula-cyan);
}

.page-about .section-title {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 3.1vw, 33px);
  line-height: 1.32;
  letter-spacing: .01em;
  color: var(--star-white);
  max-width: 22em;
}

.page-about .spine-copy {
  max-width: 40em;
}

.page-about .spine-copy p {
  margin: 0 0 1.15em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--star-white);
}

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

.page-about .spine-copy a,
.page-about .panel-body a,
.page-about .partner-cta a {
  color: var(--nebula-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 224, 198, .35);
  transition: border-color .25s var(--ease), color .25s var(--ease);
}

.page-about .spine-copy a:hover,
.page-about .panel-body a:hover,
.page-about .partner-cta a:hover {
  color: var(--warm-gold);
  border-bottom-color: var(--warm-gold);
}

/* ---------- 数据行 ---------- */

.page-about .fact-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0;
  margin: clamp(24px, 3.5vw, 34px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--grid-line);
}

.page-about .fact-row li {
  padding: 20px 18px 4px 0;
  border-right: 1px solid var(--grid-line);
}

.page-about .fact-row li:last-child {
  border-right: 0;
}

.page-about .fact-num {
  display: block;
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.1;
  color: var(--warm-gold);
  letter-spacing: .01em;
}

.page-about .fact-num small {
  font-size: .55em;
  margin-left: 2px;
  color: var(--nebula-cyan);
}

.page-about .fact-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist-blue);
}

/* ---------- 一级分类横向轨道 ---------- */

.page-about .cat-rail {
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .cat-card {
  flex: 0 0 auto;
  width: 196px;
  padding: 20px 18px 22px;
  border-left: 1px solid var(--galaxy-violet);
  border-top: 1px solid transparent;
  background: linear-gradient(165deg, rgba(21, 27, 61, .88) 0%, rgba(11, 16, 38, .3) 100%);
  transition: border-color .3s var(--ease), background .3s var(--ease), transform .3s var(--ease);
}

.page-about .cat-card:hover {
  border-left-color: var(--nebula-cyan);
  border-top-color: var(--nebula-cyan);
  background: linear-gradient(165deg, rgba(58, 46, 122, .6) 0%, rgba(11, 16, 38, .34) 100%);
  transform: translateY(-3px);
}

.page-about .cat-card__no {
  display: block;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--nebula-cyan);
}

.page-about .cat-card__name {
  margin: 14px 0 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--star-white);
}

.page-about .cat-card__meta {
  margin: 10px 0 0;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist-blue);
}

/* ---------- 图片容器 ---------- */

.page-about .about-figure {
  margin: clamp(26px, 4vw, 42px) 0 0;
  max-width: 100%;
}

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

.page-about .about-figure .media-caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist-blue);
}

/* ---------- 二级目录折叠 ---------- */

.page-about .accordion {
  margin-top: clamp(26px, 4vw, 40px);
  border-top: 1px solid var(--grid-line);
}

.page-about .accordion-item {
  border-bottom: 1px solid var(--grid-line);
}

.page-about .accordion-trigger {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  padding: 18px 4px;
  background: none;
  border: 1px solid transparent;
  border-left: 1px solid transparent;
  color: var(--star-white);
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  transition: border-color .25s var(--ease), color .25s var(--ease), padding-left .25s var(--ease);
}

.page-about .accordion-trigger:hover,
.page-about .accordion-trigger:focus-visible {
  border-left-color: var(--nebula-cyan);
  padding-left: 12px;
  color: var(--warm-gold);
}

.page-about .cat-trigger-label {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .01em;
}

.page-about .cat-trigger-meta {
  font-size: 12px;
  color: var(--mist-blue);
  white-space: nowrap;
}

.page-about .accordion-trigger[aria-expanded="true"] .cat-trigger-label::after {
  content: " −";
  color: var(--nebula-cyan);
}

.page-about .accordion-trigger[aria-expanded="false"] .cat-trigger-label::after {
  content: " +";
  color: var(--galaxy-violet);
}

.page-about .accordion-panel-inner {
  padding: 0 4px 22px 4px;
}

.page-about .cat-panel-note {
  margin: 0 0 12px;
  font-size: 13px;
  color: var(--mist-blue);
}

.page-about .cat-sublist {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 10px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .cat-sublist li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--star-white);
}

.page-about .cat-sublist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 6px;
  height: 1px;
  background: var(--nebula-cyan);
}

/* ---------- 团队 ---------- */

.page-about .team-filter {
  margin-top: clamp(24px, 3.5vw, 34px);
}

.page-about .chip-row {
  margin-bottom: 20px;
}

.page-about .team-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--grid-line);
  border: 1px solid var(--grid-line);
}

.page-about .team-item {
  padding: 22px 20px 24px;
  background: var(--deep-space);
  transition: background .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .team-item:hover {
  background: rgba(21, 27, 61, .82);
  box-shadow: inset 0 0 0 1px rgba(0, 224, 198, .35);
}

.page-about .team-item__no {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--galaxy-violet);
}

.page-about .team-item__title {
  margin: 0 0 14px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--star-white);
}

.page-about .team-duties {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team-duties li {
  padding: 6px 0 6px 14px;
  position: relative;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist-blue);
}

.page-about .team-duties li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.05em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--nebula-cyan);
}

/* ---------- 版本节点 ---------- */

.page-about .tl-track {
  position: relative;
  display: grid;
  gap: 0;
  margin: clamp(24px, 3.5vw, 36px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 30px 30px;
  border-left: 1px solid var(--grid-line);
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .tl-node {
  position: absolute;
  left: -5px;
  top: 4px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--deep-space);
  border: 1px solid var(--galaxy-violet);
  box-shadow: 0 0 0 3px rgba(123, 92, 255, .16);
  transition: border-color .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .tl-item:hover .tl-node {
  border-color: var(--warm-gold);
  box-shadow: 0 0 0 5px rgba(255, 200, 87, .16);
}

.page-about .tl-era {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--nebula-cyan);
}

.page-about .tl-title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--star-white);
}

.page-about .tl-body {
  margin: 0;
  max-width: 34em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist-blue);
}

@media (min-width: 900px) {
  .page-about .tl-track {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0 18px;
    padding-top: 30px;
    border-top: 1px solid var(--grid-line);
  }

  .page-about .tl-item {
    padding: 0;
    border-left: 0;
  }

  .page-about .tl-item:last-child {
    border-left: 0;
  }

  .page-about .tl-node {
    left: 0;
    top: -35px;
  }

  .page-about .tl-body {
    font-size: 13.5px;
  }
}

/* ---------- 四步流程 ---------- */

.page-about .steps {
  display: grid;
  gap: 1px;
  margin: clamp(24px, 3.5vw, 34px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--grid-line);
  border-top: 1px solid var(--grid-line);
  border-bottom: 1px solid var(--grid-line);
}

@media (min-width: 760px) {
  .page-about .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .step {
  position: relative;
  padding: 24px 20px 26px;
  background: var(--deep-space);
  transition: background .3s var(--ease);
}

.page-about .step:hover {
  background: rgba(21, 27, 61, .7);
}

.page-about .step-num {
  display: block;
  font-size: 26px;
  line-height: 1;
  color: var(--galaxy-violet);
  letter-spacing: .04em;
}

.page-about .step-title {
  margin: 14px 0 10px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--star-white);
}

.page-about .step-body {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mist-blue);
}

.page-about .process-note {
  margin-top: clamp(26px, 4vw, 38px);
}

.page-about .process-note .panel-body p {
  margin: 0 0 1em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--star-white);
}

.page-about .process-note .panel-body p:last-child {
  margin-bottom: 0;
}

/* ---------- 供稿与合作 ---------- */

.page-about .partner-grid {
  margin-top: clamp(24px, 3.5vw, 34px);
}

.page-about .partner-num {
  margin: 0 0 10px;
  font-size: clamp(26px, 3.2vw, 34px);
  color: var(--warm-gold);
  letter-spacing: .02em;
}

.page-about .partner-grid .panel-body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--mist-blue);
}

.page-about .partner-num + p {
  color: var(--star-white);
}

.page-about .partner-cta {
  margin: clamp(24px, 3.5vw, 34px) 0 0;
  padding-top: 20px;
  border-top: 1px dashed var(--grid-line);
  max-width: 40em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist-blue);
}

/* ---------- 窄屏收敛 ---------- */

@media (max-width: 600px) {
  .page-about .fact-row li {
    padding: 16px 14px 4px 0;
  }

  .page-about .cat-card {
    width: 168px;
  }

  .page-about .about-hero__side {
    padding: 18px 16px 20px;
  }

  .page-about .accordion-trigger {
    flex-wrap: wrap;
    gap: 6px;
  }
}

@media (min-width: 960px) {
  .page-about {
    --about-spine-x: 76px;
    --about-gutter: 148px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .cat-card,
  .page-about .spine-section::before,
  .page-about .tl-node,
  .page-about .about-index a::after {
    transition: none;
  }

  .page-about .cat-card:hover {
    transform: none;
  }
}