/* ===== 品牌故事页 · page-about ===== */

.page-about {
  --about-frame: rgba(46, 90, 120, 0.55);
  --about-frame-soft: rgba(46, 90, 120, 0.26);
  --about-text-soft: rgba(232, 241, 248, 0.8);
  --about-text-dim: rgba(232, 241, 248, 0.62);
  --about-ink: #060E17;
  background:
    radial-gradient(130% 55% at 88% 0%, rgba(27, 58, 92, 0.62), transparent 62%),
    radial-gradient(90% 60% at 0% 100%, rgba(18, 41, 61, 0.55), transparent 60%),
    linear-gradient(180deg, var(--night) 0%, var(--deep) 46%, var(--night) 100%);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about img {
  display: block;
  max-width: 100%;
}

.page-about .media {
  overflow: hidden;
  border: 1px solid var(--about-frame-soft);
  background: var(--cloud);
}

.page-about .media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .section {
  padding-block: clamp(46px, 6.4vw, 84px);
}

.page-about .section__index {
  display: inline-block;
  color: var(--grey);
  font-size: 13px;
  letter-spacing: 0.14em;
  margin: 0 0 10px;
}

.page-about .section__title {
  margin: 0 0 12px;
  letter-spacing: -0.025em;
  line-height: 1;
}

.page-about .section__lead {
  margin: 0;
  max-width: 46ch;
  color: var(--about-text-soft);
}

/* ---------- 首屏：对角切分 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: 30px 0 clamp(54px, 8vw, 92px);
  background: linear-gradient(
    163deg,
    rgba(27, 58, 92, 0.97) 0%,
    rgba(27, 58, 92, 0.97) 44.4%,
    rgba(8, 19, 31, 0.99) 45%,
    rgba(8, 19, 31, 0.99) 100%
  );
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background: linear-gradient(
    163deg,
    transparent 43.8%,
    rgba(0, 229, 255, 0.5) 44.4%,
    rgba(0, 229, 255, 0.5) 44.7%,
    transparent 45.4%
  );
}

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

.page-about .about-hero .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
  font-size: 13px;
}

.page-about .about-hero .breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--grey);
}

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

.page-about .about-hero .breadcrumbs [aria-current="page"] {
  color: var(--grey);
}

.page-about .about-hero__title {
  margin: 12px 0 22px;
  max-width: 15ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 6.8vw, 62px);
  line-height: 0.98;
  letter-spacing: -0.03em;
  text-wrap: balance;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 40ch;
  font-family: var(--font-serif);
  font-size: clamp(16px, 2.2vw, 20px);
  line-height: 1.62;
  color: var(--about-text-soft);
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 24px;
  margin: 34px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--about-frame-soft);
}

.page-about .hero-stats__item {
  min-width: 0;
}

.page-about .hero-stats dt {
  margin: 0 0 6px;
  color: var(--grey);
}

.page-about .hero-stats dd {
  margin: 0;
  font-size: clamp(21px, 3vw, 29px);
  font-weight: 700;
  color: var(--yellow);
  line-height: 1.1;
}

/* ---------- 起点段落 ---------- */

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

.page-about .about-grid__index {
  margin: 0;
  color: var(--bolt);
  border-left: 2px solid var(--steel);
  padding-left: 10px;
  line-height: 1.4;
}

.page-about .paper-quote {
  position: relative;
  margin: 34px 0 0;
  padding: 24px 26px;
  background: var(--cloud);
  border: 1px solid var(--about-frame);
  border-radius: 2px 2px 22px 2px;
  box-shadow: 8px 10px 0 rgba(46, 90, 120, 0.2), 8px 10px 0 1px var(--about-frame-soft);
}

.page-about .paper-quote p {
  margin: 0;
  max-width: 40ch;
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.7;
  color: var(--paper);
}

/* ---------- 校订流水线 ---------- */

.page-about .pipeline-figure {
  margin: 34px 0 46px;
}

.page-about .pipeline-figure__frame {
  aspect-ratio: 8 / 5;
}

.page-about .pipeline-figure__caption {
  display: block;
  margin-top: 12px;
  color: var(--grey);
  letter-spacing: 0.06em;
  line-height: 1.6;
}

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

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 14px;
  bottom: 26px;
  width: 2px;
  background: linear-gradient(180deg, var(--signal) 0%, var(--steel) 52%, var(--steel) 100%);
}

.page-about .tl__item {
  position: relative;
  padding: 0 0 30px 52px;
}

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

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 4px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--deep);
  border: 2px solid var(--steel);
  box-shadow: 0 0 0 4px var(--night);
  z-index: 1;
  transition: border-color 120ms var(--ease), box-shadow 120ms var(--ease);
}

.page-about .tl__item[data-state="done"]::before {
  border-color: var(--signal);
}

.page-about .tl__item[data-state="pending"]::before {
  border-color: var(--alert);
}

.page-about .tl__item:hover::before,
.page-about .tl__item:focus-within::before {
  box-shadow: 0 0 0 4px var(--night), 0 0 0 6px rgba(0, 229, 255, 0.35);
}

.page-about .tl__stamp {
  display: inline-block;
  margin: 0 0 12px;
  padding: 4px 9px;
  border: 1px solid var(--about-frame);
  background: rgba(18, 41, 61, 0.62);
  color: var(--bolt);
  font-size: 12px;
  letter-spacing: 0.05em;
  transition: border-color 120ms var(--ease);
}

.page-about .tl__item:hover .tl__stamp {
  border-color: var(--bolt);
}

.page-about .tl__name {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .tl__desc {
  margin: 0;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-text-soft);
}

.page-about .tl__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  margin: 12px 0 0;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--grey);
  transition: color 120ms var(--ease);
}

.page-about .tl__meta span {
  padding: 3px 9px;
  border: 1px solid var(--about-frame-soft);
}

.page-about .tl__item:hover .tl__meta {
  color: var(--paper);
}

 /* ---------- 团队与分工 ---------- */

.page-about .about-team {
  background: linear-gradient(180deg, rgba(18, 41, 61, 0.42), rgba(8, 19, 31, 0));
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 34px;
  background: var(--about-frame-soft);
  border: 1px solid var(--about-frame-soft);
}

.page-about .role {
  padding: 26px 22px 30px;
  background: var(--night);
  transition: background 120ms var(--ease);
}

.page-about .role:hover {
  background: rgba(18, 41, 61, 0.85);
}

.page-about .role__tag {
  display: inline-block;
  margin: 0 0 16px;
  padding: 4px 10px;
  border: 1px solid var(--yellow);
  color: var(--yellow);
  background: none;
  line-height: 1.4;
}

.page-about .role__name {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .role__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-text-soft);
}

.page-about .team-note {
  margin: 28px 0 0;
  padding-left: 16px;
  max-width: 52ch;
  border-left: 2px solid var(--steel);
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-text-dim);
}

/* ---------- 发展历程 ---------- */

.page-about .eras-figure {
  margin: 34px 0 38px;
}

.page-about .eras-figure__frame {
  aspect-ratio: 14 / 5;
}

.page-about .eras-figure__caption {
  display: block;
  margin-top: 12px;
  color: var(--grey);
  letter-spacing: 0.06em;
  line-height: 1.6;
}

.page-about .eras {
  display: grid;
  gap: 14px;
}

.page-about .era {
  --era-tone: rgba(27, 58, 92, 0.42);
  border-left: 4px solid var(--steel);
  background: linear-gradient(90deg, var(--era-tone), rgba(18, 41, 61, 0.18) 78%, transparent 100%);
  transition: border-color 120ms var(--ease);
}

.page-about .era:nth-child(1) { --era-tone: rgba(27, 58, 92, 0.62); }
.page-about .era:nth-child(2) { --era-tone: rgba(27, 58, 92, 0.48); }
.page-about .era:nth-child(3) { --era-tone: rgba(27, 58, 92, 0.36); }
.page-about .era:nth-child(4) { --era-tone: rgba(27, 58, 92, 0.24); }

.page-about .era[open],
.page-about .era:hover {
  border-left-color: var(--bolt);
}

.page-about .era__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 18px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .era__no {
  color: var(--grey);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .era__name {
  font-family: var(--font-display);
  font-size: clamp(17px, 2.6vw, 22px);
  font-weight: 800;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .era__cue {
  display: inline-flex;
  align-items: center;
  color: var(--grey);
  white-space: nowrap;
}

.page-about .era__cue::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 8px;
  border-right: 1.5px solid var(--bolt);
  border-bottom: 1.5px solid var(--bolt);
  transform: rotate(45deg);
  transition: transform 120ms var(--ease);
}

.page-about .era[open] .era__cue::before {
  transform: rotate(-135deg);
}

.page-about .era__body {
  padding: 0 18px 22px;
}

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

.page-about .era__list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--about-text-soft);
  max-width: 56ch;
}

.page-about .era__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 1px;
  background: var(--bolt);
}

 /* ---------- 运营与合规 ---------- */

.page-about .ops-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
}

.page-about .ops-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0 0;
}

.page-about .ops-links .btn {
  text-decoration: none;
}

.page-about .ops-figure {
  margin: 0;
  max-width: 420px;
}

.page-about .ops-figure__frame {
  aspect-ratio: 1 / 1;
}

 /* ---------- 收尾入口 ---------- */

.page-about .about-next {
  padding-block: clamp(36px, 5vw, 62px) clamp(58px, 8vw, 96px);
}

.page-about .about-next h2 {
  margin: 0 0 18px;
  color: var(--grey);
}

.page-about .next-links {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--about-frame-soft);
  border-top: 1px solid var(--about-frame-soft);
  border-bottom: 1px solid var(--about-frame-soft);
}

.page-about .next-links li {
  background: var(--night);
}

.page-about .next-links a {
  display: block;
  padding: 18px 4px;
  font-size: 15px;
  color: var(--paper);
  text-decoration: none;
  transition: color 120ms var(--ease), padding-left 120ms var(--ease);
}

.page-about .next-links a:hover,
.page-about .next-links a:focus-visible {
  color: var(--bolt);
  padding-left: 12px;
}

 /* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .about-pipeline .shell {
    display: block;
  }

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

@media (min-width: 820px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-grid {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 0 40px;
    align-items: start;
  }

  .page-about .about-grid__body {
    max-width: 720px;
  }

  .page-about .tl__item {
    display: grid;
    grid-template-columns: 176px minmax(0, 1fr);
    column-gap: 30px;
    padding-bottom: 34px;
  }

  .page-about .tl__stamp {
    margin-bottom: 0;
    align-self: start;
    justify-self: start;
  }

  .page-about .tl__body {
    grid-column: 2;
    padding-top: 2px;
  }

  .page-about .ops-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .ops-figure {
    margin-top: 8px;
  }
}

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

  .page-about .next-links a {
    padding: 20px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__item::before,
  .page-about .tl__stamp,
  .page-about .tl__meta,
  .page-about .era__cue::before,
  .page-about .role,
  .page-about .next-links a {
    transition: none;
  }
}