/* ===== 品牌价值页 · page-about ===== */
.page-about {
  --about-rail: 252px;
  --about-gap: 64px;
  display: block;
  color: var(--c-text);
  background: var(--c-bg);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.78;
}

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

.page-about a:focus-visible,
.page-about [tabindex]:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 2px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding: 20px 0 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: 18px;
  padding: 46px 0 54px;
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
  background:
    radial-gradient(120% 92% at 10% 0%, rgba(53, 230, 210, 0.11), transparent 58%),
    radial-gradient(90% 80% at 92% 10%, rgba(255, 79, 163, 0.07), transparent 60%),
    linear-gradient(180deg, var(--c-bg-2), var(--c-bg));
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--c-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--c-line) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: 0.2;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero h1 {
  margin: 14px 0 22px;
  max-width: 17em;
  font-size: clamp(28px, 5vw, 52px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: 0.015em;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 62ch;
  color: var(--c-text-2);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-text-2);
}

.page-about .about-hero__meta li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-hero__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-cyan);
  flex: none;
}

.page-about .about-hero__dot--magenta { background: var(--c-magenta); }
.page-about .about-hero__dot--amber { background: var(--c-amber); }

/* ---------- 分屏骨架 ---------- */
.page-about .about-layout {
  padding-top: 54px;
}

.page-about .about-rail {
  margin-bottom: 40px;
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--c-text-2);
}

.page-about .about-nav__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-nav__list > li { flex: 0 0 auto; }

.page-about .about-nav__link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-bottom: 2px solid transparent;
  color: var(--c-text-2);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition:
    color var(--t-hover) var(--ease),
    border-color var(--t-hover) var(--ease),
    background-color var(--t-hover) var(--ease);
}

.page-about .about-nav__link:hover,
.page-about .about-nav__link:focus-visible {
  color: var(--c-text);
  border-bottom-color: var(--c-cyan);
  background: var(--c-bg-2);
}

.page-about .about-nav__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--c-magenta);
}

.page-about .about-rail__note { display: none; }

@media (min-width: 1040px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 88px;
    margin-bottom: 0;
  }

  .page-about .about-nav__list {
    display: block;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-nav__link {
    display: grid;
    grid-template-columns: 28px minmax(0, 1fr);
    gap: 10px;
    width: 100%;
    padding: 10px 12px;
    border-bottom: 0;
    border-left: 2px solid transparent;
    white-space: normal;
  }

  .page-about .about-nav__link:hover,
  .page-about .about-nav__link:focus-visible {
    border-bottom-color: transparent;
    border-left-color: var(--c-cyan);
  }

  .page-about .about-rail__note {
    display: block;
    margin: 22px 0 0;
    padding: 16px 12px 0;
    border-top: 1px solid var(--c-line);
    font-size: 13px;
    color: var(--c-text-2);
  }

  .page-about .about-rail__note a,
  .page-about .identity__note a,
  .page-about .audience-item__desc a,
  .page-about .tl__desc a {
    color: var(--c-cyan);
    text-decoration: none;
  }
}

/* ---------- 区块通用 ---------- */
.page-about .about-block {
  margin-bottom: var(--sec);
  scroll-margin-top: 96px;
}

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

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

.page-about .about-block__head h2 {
  margin: 10px 0 0;
  max-width: 20em;
  font-size: clamp(22px, 3.2vw, 34px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: 0.012em;
}

.page-about .prose {
  margin: 0 0 18px;
  max-width: 66ch;
  color: var(--c-text-2);
}

/* ---------- 服务对象 ---------- */
.page-about .audience-list {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--c-line);
}

.page-about .audience-item {
  display: grid;
  gap: 6px;
  padding: 24px 0;
  border-bottom: 1px solid var(--c-line);
  transition: background-color var(--t-hover) var(--ease);
}

.page-about .audience-item:hover {
  background: rgba(14, 22, 48, 0.62);
}

.page-about .audience-item__key {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-cyan);
}

.page-about .audience-item__title {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
}

.page-about .audience-item__desc {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  color: var(--c-text-2);
}

.page-about .audience-item__desc a,
.page-about .tl__desc a,
.page-about .identity__note a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 230, 210, 0.4);
}

.page-about .audience-item__desc a:hover,
.page-about .tl__desc a:hover,
.page-about .identity__note a:hover {
  border-bottom-color: var(--c-cyan);
}

@media (min-width: 720px) {
  .page-about .audience-item {
    grid-template-columns: 180px minmax(0, 1fr);
    grid-template-areas:
      "key title"
      "key desc";
    gap: 4px 28px;
    padding: 26px 16px;
  }

  .page-about .audience-item__key { grid-area: key; padding-top: 4px; }
  .page-about .audience-item__title { grid-area: title; }
  .page-about .audience-item__desc { grid-area: desc; }
}

/* ---------- 沿革时间轴 ---------- */
.page-about .trajectory-media {
  margin: 0 0 36px;
}

.page-about .trajectory-media .media-frame {
  display: block;
}

.page-about .media-cap {
  margin: 10px 0 0;
  font-size: 13px;
  color: var(--c-text-2);
}

.page-about .tl {
  position: relative;
  margin: 0;
  padding: 0 0 0 34px;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-magenta), var(--c-line) 32%, var(--c-line));
}

.page-about .tl__item {
  position: relative;
  padding-bottom: 34px;
}

.page-about .tl__item:last-child { padding-bottom: 0; }

.page-about .tl__dot {
  position: absolute;
  left: -34px;
  top: 8px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  border: 1px solid var(--c-magenta);
  background: var(--c-bg);
  transition:
    background-color var(--t-hover) var(--ease),
    transform var(--t-hover) var(--ease),
    box-shadow var(--t-hover) var(--ease);
}

.page-about .tl__item:hover .tl__dot,
.page-about .tl__item:focus-within .tl__dot {
  background: var(--c-magenta);
  transform: scale(1.2);
  box-shadow: 0 0 0 4px rgba(255, 79, 163, 0.16);
}

.page-about .tl__card {
  border-left: 2px solid transparent;
  transition:
    margin-left var(--t-state) var(--ease),
    border-color var(--t-hover) var(--ease);
}

.page-about .tl__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--c-magenta);
  font-variant-numeric: tabular-nums;
}

.page-about .tl__title {
  margin: 8px 0;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .tl__desc {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  color: var(--c-text-2);
  transition: color var(--t-hover) var(--ease);
}

.page-about .tl__item:hover .tl__desc {
  color: var(--c-text);
}

@media (min-width: 900px) {
  .page-about .tl__card {
    border-left: 2px solid var(--c-line);
    padding: 2px 0 2px 18px;
  }

  .page-about .tl__item:hover .tl__card {
    border-left-color: var(--c-cyan);
  }

  .page-about .tl__item:nth-child(even) .tl__card {
    margin-left: 56px;
  }
}

/* ---------- 数据带 ---------- */
.page-about .data-band {
  position: relative;
  margin: 0 0 var(--sec);
  padding: 36px 22px;
  background: var(--c-bg-2);
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
  overflow: hidden;
}

.page-about .data-band::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--c-cyan), transparent);
  opacity: 0.55;
}

.page-about .data-band__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px 20px;
  margin: 0;
}

.page-about .data-band__cell { margin: 0; }

.page-about .data-band__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(34px, 6.4vw, 58px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .data-band__num--magenta { color: var(--c-magenta); }
.page-about .data-band__num--amber { color: var(--c-amber); }
.page-about .data-band__num--mint { color: var(--c-mint); }

.page-about .data-band__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--c-text-2);
}

@media (min-width: 800px) {
  .page-about .data-band { padding: 44px 28px; }

  .page-about .data-band__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .data-band__cell + .data-band__cell {
    border-left: 1px solid var(--c-line);
    padding-left: 24px;
  }
}

/* ---------- 团队 ---------- */
.page-about .team-media {
  margin: 26px 0 0;
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 26px;
}

.page-about .team-card {
  padding: 22px 18px;
  background: var(--c-panel);
  border-top: 2px solid var(--c-line);
  clip-path: polygon(
    var(--cut) 0,
    100% 0,
    100% calc(100% - var(--cut)),
    calc(100% - var(--cut)) 100%,
    0 100%,
    0 var(--cut)
  );
  transition:
    border-color var(--t-hover) var(--ease),
    background-color var(--t-hover) var(--ease),
    transform var(--t-hover) var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-visible,
.page-about .team-card:focus-within {
  border-top-color: var(--c-cyan);
  background: #1b2748;
  transform: translateY(-3px);
}

.page-about .team-card__role {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-cyan);
}

.page-about .team-card__num {
  margin: 10px 0 12px;
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-text);
  font-variant-numeric: tabular-nums;
}

.page-about .team-card__unit {
  margin-left: 4px;
  font-size: 14px;
  font-weight: 400;
  color: var(--c-text-2);
}

.page-about .team-card__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--c-text-2);
}

@media (min-width: 820px) {
  .page-about .team-grid {
    grid-template-columns: 1.3fr 1fr 1.15fr 0.95fr;
    gap: 16px;
    align-items: start;
  }

  .page-about .team-card:nth-child(2) { margin-top: 28px; }
  .page-about .team-card:nth-child(4) { margin-top: 14px; }
}

/* ---------- 内容标准 ---------- */
.page-about .standards-wrap {
  display: grid;
  gap: 32px;
  margin-top: 26px;
}

.page-about .steps {
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
}

.page-about .step {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-top: 1px solid var(--c-line);
}

.page-about .step:last-child {
  border-bottom: 1px solid var(--c-line);
}

.page-about .step__no {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--c-cyan);
}

.page-about .step__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
}

.page-about .step__desc {
  margin: 0;
  font-size: 14.5px;
  color: var(--c-text-2);
}

.page-about .standards-fig {
  margin: 0;
}

@media (min-width: 900px) {
  .page-about .standards-wrap {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }
}

/* ---------- 合作与认可 ---------- */
.page-about .recog-grid {
  display: grid;
  gap: 20px;
  margin-top: 26px;
}

.page-about .recog-item {
  padding: 26px 22px;
  background: var(--c-bg-2);
  border-left: 3px solid var(--c-cyan);
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - var(--cut)),
    calc(100% - var(--cut)) 100%,
    0 100%
  );
}

.page-about .recog-item--alt {
  border-left-color: var(--c-amber);
}

.page-about .recog-item__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 46px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .recog-item--alt .recog-item__num {
  color: var(--c-amber);
}

.page-about .recog-item__title {
  margin: 12px 0 10px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
}

.page-about .recog-item__desc {
  margin: 0;
  font-size: 14.5px;
  color: var(--c-text-2);
}

@media (min-width: 820px) {
  .page-about .recog-grid {
    grid-template-columns: 1.1fr 1fr;
    gap: 24px;
  }

  .page-about .recog-item--alt {
    margin-top: 32px;
  }
}

/* ---------- 站点主体 ---------- */
.page-about .identity {
  margin-top: 26px;
  padding: 26px 22px;
  background: var(--c-bg-2);
  border: 1px solid var(--c-line);
}

.page-about .identity .prose {
  margin-bottom: 6px;
}

.page-about .identity-list {
  margin: 20px 0 0;
  padding: 0;
}

.page-about .identity-row {
  display: grid;
  grid-template-columns: 100px minmax(0, 1fr);
  gap: 14px;
  padding: 12px 0;
  border-top: 1px solid var(--c-line);
  font-size: 14.5px;
}

.page-about .identity-row:last-child {
  border-bottom: 1px solid var(--c-line);
}

.page-about .identity-row dt {
  padding-top: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-text-2);
}

.page-about .identity-row dd {
  margin: 0;
  color: var(--c-text);
}

.page-about .identity__note {
  margin: 20px 0 0;
  font-size: 14px;
  color: var(--c-text-2);
}

@media (min-width: 640px) {
  .page-about .identity {
    padding: 30px 28px;
  }

  .page-about .identity-row {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .tl__dot,
  .page-about .tl__card,
  .page-about .tl__desc {
    transition: none;
  }

  .page-about .team-card:hover,
  .page-about .team-card:focus-visible,
  .page-about .team-card:focus-within {
    transform: none;
  }

  .page-about .tl__item:hover .tl__dot,
  .page-about .tl__item:focus-within .tl__dot {
    transform: none;
  }
}