/* ===== 品牌档案页 · page-about ===== */

.page-about {
  --about-section: clamp(64px, 9vw, 118px);
  padding-top: 0;
  background: var(--ink);
  color: var(--cream);
  overflow-x: hidden;
}

/* --- 通用排版 --- */
.page-about h2 {
  margin: 8px 0 22px;
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 3.4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.15;
  color: var(--cream);
}

.page-about .eyebrow {
  margin: 0 0 12px;
}

.page-about a {
  color: var(--cyan);
  text-underline-offset: 3px;
}

.page-about a:hover,
.page-about a:focus-visible {
  color: var(--violet-lit);
}

.page-about ::selection {
  background: var(--violet);
  color: var(--cream);
}

/* --- 首屏 --- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + clamp(44px, 7vw, 92px)) 0 clamp(40px, 6vw, 76px);
  background:
    linear-gradient(180deg, rgba(139, 92, 246, 0.18) 0%, rgba(7, 6, 15, 0) 62%),
    var(--ink);
  border-bottom: 2px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    180deg,
    rgba(199, 203, 209, 0.045) 0 1px,
    transparent 1px 4px
  );
}

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

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--silver);
}

.page-about .breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  margin: 0 8px;
  color: var(--line-strong);
}

.page-about .breadcrumbs__item a {
  color: var(--cyan);
  text-decoration: none;
}

.page-about .breadcrumbs__item a:hover,
.page-about .breadcrumbs__item a:focus-visible {
  color: var(--violet-lit);
  text-decoration: underline;
}

.page-about h1 {
  margin: 0 0 clamp(28px, 4vw, 44px);
  max-width: 18ch;
  font-family: var(--font-display);
  font-size: clamp(2rem, 6.2vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.06;
  color: var(--cream);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

.page-about .about-hero__lede p {
  margin: 0 0 18px;
  max-width: var(--measure);
  font-size: 17px;
  line-height: 1.8;
  color: var(--cream);
}

.page-about .about-hero__lede p:last-child {
  margin-bottom: 0;
  color: var(--silver);
}

/* --- 图片容器 --- */
.page-about .media {
  margin: 0;
}

.page-about .media__frame {
  overflow: hidden;
  border: 2px solid var(--line-strong);
  box-shadow: var(--shadow-hard);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

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

.page-about .about-hero__media .media__img {
  aspect-ratio: 8 / 5;
}

.page-about .about-version__media .media__img {
  aspect-ratio: 14 / 9;
}

.page-about .about-team__media .media__img {
  aspect-ratio: 3 / 2;
}

.page-about .media__caption {
  margin-top: 14px;
  max-width: 46ch;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.65;
  color: var(--silver);
}

/* --- 档案卡统计条 --- */
.page-about .about-ledger {
  padding: var(--about-section) 0;
  background: var(--stone);
  border-bottom: 2px solid var(--line);
}

.page-about .stat-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 2px solid var(--line-strong);
  border-left: 2px solid var(--line-strong);
}

.page-about .stat-item {
  padding: 22px 18px 24px;
  background: var(--ink-soft);
  border-right: 2px solid var(--line-strong);
  border-bottom: 2px solid var(--line-strong);
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.4vw, 2.55rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--cream);
}

.page-about .stat-unit {
  margin-left: 4px;
  font-size: 0.42em;
  font-weight: 700;
  letter-spacing: 0;
  color: var(--cyan);
}

.page-about .stat-label {
  display: block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--silver);
}

/* --- 版本时间轴 --- */
.page-about .about-version {
  padding: var(--about-section) 0;
}

.page-about .about-version__lede {
  margin: 0 0 clamp(36px, 5vw, 56px);
  max-width: var(--measure);
  font-size: 17px;
  line-height: 1.8;
  color: var(--silver);
}

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

.page-about .timeline__item {
  position: relative;
  padding: 0 0 38px 30px;
  border-left: 2px solid var(--line);
  outline: none;
  transition: border-color 200ms ease;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -9px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--stone-lit);
  border: 2px solid var(--line-strong);
  transition: background-color 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.page-about .timeline__item:hover {
  border-left-color: var(--violet);
}

.page-about .timeline__item:hover::before,
.page-about .timeline__item:focus-within::before,
.page-about .timeline__item:focus::before {
  background: var(--violet);
  border-color: var(--violet-lit);
  box-shadow: 0 0 0 5px rgba(139, 92, 246, 0.22);
}

.page-about .timeline__item:focus-visible {
  border-left-color: var(--violet-lit);
}

.page-about .timeline__index {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--violet-lit);
}

.page-about .timeline__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2.6vw, 1.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--cream);
}

.page-about .timeline__text {
  margin: 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .timeline__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
}

.page-about .timeline__facts li {
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  background: rgba(34, 211, 238, 0.07);
  border: 1px solid rgba(34, 211, 238, 0.34);
}

.page-about .about-version__media {
  margin: clamp(40px, 6vw, 64px) 0 0;
  max-width: 940px;
}

/* --- 覆盖与终端 --- */
.page-about .about-reach {
  padding: var(--about-section) 0;
  background: var(--stone);
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
}

.page-about .terminal-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin-top: 34px;
}

.page-about .terminal {
  padding: 24px 22px 26px;
  background: var(--ink);
  border: 2px solid var(--line-strong);
  box-shadow: var(--shadow-cyan);
  transition: transform 200ms ease, border-color 200ms ease;
}

.page-about .terminal:hover,
.page-about .terminal:focus-within {
  transform: translateY(-3px);
  border-color: var(--cyan);
}

.page-about .terminal__tag {
  display: inline-block;
  margin: 0 0 14px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--yellow);
  background: rgba(255, 212, 0, 0.10);
  border: 1px solid rgba(255, 212, 0, 0.42);
}

.page-about .terminal h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--cream);
}

.page-about .terminal p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--silver);
}

.page-about .about-reach__note {
  margin: 34px 0 0;
  max-width: var(--measure);
  font-size: 16px;
  line-height: 1.8;
  color: var(--cream);
}

.page-about .about-reach__note a {
  color: var(--cyan);
  text-decoration: underline;
}

/* --- 团队与协作 --- */
.page-about .about-team {
  padding: var(--about-section) 0;
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
}

.page-about .about-team__text p {
  margin: 0 0 18px;
  max-width: var(--measure);
  font-size: 16px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-team__list {
  list-style: none;
  margin: 26px 0;
  padding: 0;
  border-top: 2px solid var(--line);
}

.page-about .about-team__list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 0;
  border-bottom: 2px solid var(--line);
}

.page-about .about-team__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.07em;
  color: var(--violet-lit);
}

.page-about .about-team__v {
  font-size: 15px;
  line-height: 1.75;
  color: var(--cream);
}

/* --- 备案与站点信息 --- */
.page-about .about-legal {
  padding: var(--about-section) 0 calc(var(--about-section) * 0.7);
  background: var(--ink-soft);
  border-top: 2px solid var(--line);
}

.page-about .about-legal__list {
  margin: 0 0 28px;
  padding: 0;
  border-top: 2px solid var(--line-strong);
}

.page-about .about-legal__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 18px 0;
  border-bottom: 2px solid var(--line);
}

.page-about .about-legal__row dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--silver);
}

.page-about .about-legal__row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 16px;
  letter-spacing: 0.02em;
  color: var(--cream);
}

.page-about .about-legal__text {
  margin: 0 0 30px;
  max-width: var(--measure);
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-legal__text a {
  color: var(--cyan);
  text-decoration: underline;
}

.page-about .about-legal__hint {
  margin: 0;
  max-width: 62ch;
  padding: 20px 22px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--cream);
  background: rgba(255, 212, 0, 0.07);
  border: 2px solid var(--yellow);
  box-shadow: var(--shadow-yellow);
}

.page-about .about-legal__hint strong {
  color: var(--yellow);
}

/* --- 响应式 --- */
@media (min-width: 560px) {
  .page-about .about-team__list li {
    grid-template-columns: 116px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }

  .page-about .about-legal__row {
    grid-template-columns: 160px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

@media (min-width: 720px) {
  .page-about .stat-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .terminal-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.12fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-hero__lede {
    padding-top: 8px;
  }

  .page-about .timeline {
    border-left: 2px solid var(--line);
  }

  .page-about .timeline__item {
    display: grid;
    grid-template-columns: 140px minmax(0, 1fr);
    column-gap: 36px;
    padding: 0 0 52px 36px;
    border-left: none;
  }

  .page-about .timeline__item::before {
    left: -9px;
    top: 8px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 56px;
    align-items: center;
  }
}

@media (min-width: 1080px) {
  .page-about .stat-strip {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__item,
  .page-about .timeline__item::before,
  .page-about .terminal {
    transition: none;
  }

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