/* ============ 品牌档案页 page-about ============ */
.page-about {
  --ab-rail: 28px;
  --ab-rail-lg: 64px;
  display: block;
  color: var(--ink);
  font-family: var(--sans);
}

/* ---------- 首屏 ---------- */
.page-about .brand-hero {
  position: relative;
  padding: 22px 0 36px;
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(245, 166, 35, 0.16), transparent 62%),
    radial-gradient(90% 70% at 0% 100%, rgba(110, 155, 127, 0.14), transparent 60%);
}

.page-about .brand-hero__grid {
  display: grid;
  gap: 26px;
  margin-top: 18px;
}

.page-about .brand-hero h1 {
  margin: 10px 0 14px;
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(1.7rem, 6.4vw, 2.75rem);
  line-height: 1.26;
  letter-spacing: -0.02em;
  color: var(--ink);
  max-width: 18em;
}

.page-about .brand-hero__intro {
  margin: 0 0 12px;
  max-width: 34em;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .brand-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-about .brand-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 14px;
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: 4px;
}

.page-about .hero-stat {
  padding-left: 10px;
  border-left: 2px solid var(--orange);
}

.page-about .hero-stat__num {
  display: block;
  font-family: var(--mono);
  font-size: 1.3rem;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .hero-stat__label {
  display: block;
  margin-top: 5px;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--mute);
}

/* ---------- 左侧窄轨时间线骨架 ---------- */
.page-about .archive-flow {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 36px 20px 56px;
  display: grid;
  gap: 52px;
}

.page-about .flow-section {
  display: grid;
  grid-template-columns: var(--ab-rail) minmax(0, 1fr);
  gap: 16px;
}

.page-about .flow-mark {
  position: relative;
  display: flex;
  justify-content: center;
}

.page-about .flow-mark::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 0;
  bottom: -52px;
  width: 2px;
  background: linear-gradient(rgba(22, 48, 42, 0.32), rgba(22, 48, 42, 0.12));
}

.page-about .flow-section--end .flow-mark::before {
  bottom: 0;
}

.page-about .flow-node {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.02em;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line-strong);
  border-radius: 2px;
}

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

.page-about .flow-body h2 {
  margin: 6px 0 14px;
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(1.3rem, 4.6vw, 1.95rem);
  line-height: 1.32;
  letter-spacing: -0.02em;
  color: var(--ink);
  max-width: 22em;
}

.page-about .flow-body p {
  margin: 0 0 14px;
  line-height: 1.85;
}

.page-about .flow-body .prose {
  max-width: 34em;
}

/* ---------- 档案盒标签（彩蛋） ---------- */
.page-about .archive-label {
  position: relative;
  margin: 22px 0 0;
  padding: 14px 16px 14px 18px;
  background: var(--paper-2);
  border-left: 4px solid var(--seal);
  border-radius: 0 3px 3px 0;
}

.page-about .archive-label__tag {
  display: inline-block;
  padding: 2px 7px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--seal);
  border: 1px solid rgba(178, 58, 46, 0.5);
  border-radius: 2px;
}

.page-about .archive-label__text {
  margin: 10px 0 6px;
  font-family: var(--serif);
  font-size: 1.12rem;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .archive-label__meta {
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--mute);
}

/* ---------- 三道工序 ---------- */
.page-about .gates {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .gates__item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 6px 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .gates__num {
  grid-row: span 2;
  font-family: var(--mono);
  font-size: 1.15rem;
  line-height: 1.3;
  color: var(--orange);
}

.page-about .gates__title {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.08rem;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .gates__item p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 九宫格栏目地图 ---------- */
.page-about .column-map {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-top: 24px;
}

.page-about .column-cell {
  position: relative;
  display: block;
  padding: 16px 16px 20px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 3px;
  color: var(--ink);
  text-decoration: none;
  transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.page-about .column-cell::after {
  content: "";
  position: absolute;
  right: 10px;
  bottom: 10px;
  width: 6px;
  height: 6px;
  background: var(--seal);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.page-about .column-cell:hover,
.page-about .column-cell:focus-visible {
  background: var(--white);
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.page-about .column-cell:hover::after,
.page-about .column-cell:focus-visible::after {
  opacity: 1;
}

.page-about .column-cell__count {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--mute);
}

.page-about .column-cell__name {
  display: block;
  margin: 6px 0 6px;
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.02rem;
  line-height: 1.4;
}

.page-about .column-cell__desc {
  display: block;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--mute);
}

/* ---------- 团队分组标签页 ---------- */
.page-about .team-tabs {
  margin-top: 26px;
}

.page-about .team-tabs .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.page-about .team-tabs .tab {
  padding: 8px 14px;
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  cursor: pointer;
  transition: background-color 0.16s ease, border-color 0.16s ease;
}

.page-about .team-tabs .tab[aria-selected="true"] {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
}

.page-about .team-tabs__panel {
  padding: 20px 18px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 3px;
}

.page-about .team-tabs__head {
  margin: 0 0 10px;
  font-size: 0.98rem;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .team-tabs__size {
  display: inline-block;
  margin-right: 8px;
  padding: 2px 8px;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink);
  background: rgba(110, 155, 127, 0.28);
  border-radius: 2px;
}

.page-about .team-tabs__panel p:last-child {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--ink);
}

/* ---------- 版本时间线 ---------- */
.page-about .versionline {
  margin-top: 26px;
}

.page-about .versionline__list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 4px;
  margin-bottom: 22px;
}

.page-about .versionline__node {
  position: relative;
  padding: 10px 2px 16px;
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--mute);
  background: transparent;
  border: 0;
  border-bottom: 3px solid var(--line);
  cursor: pointer;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.page-about .versionline__node::before {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -8px;
  width: 9px;
  height: 9px;
  transform: translateX(-50%);
  background: var(--paper);
  border: 2px solid var(--line-strong);
  border-radius: 50%;
  transition: background-color 0.16s ease, border-color 0.16s ease;
}

.page-about .versionline__node[aria-selected="true"] {
  color: var(--ink);
  border-bottom-color: var(--orange);
}

.page-about .versionline__node[aria-selected="true"]::before {
  background: var(--orange);
  border-color: var(--orange);
}

.page-about .versionline__panel {
  padding: 18px 18px 18px 20px;
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 4px solid var(--seal);
  border-radius: 2px;
}

.page-about .versionline__panel h3 {
  margin: 6px 0 8px;
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.08rem;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .versionline__panel p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .versionline__panel .meta {
  margin: 0;
  font-size: 0.74rem;
  color: var(--mute);
}

/* ---------- 每周更新节奏 ---------- */
.page-about .weekly {
  margin: 24px 0 0;
}

/* ---------- 收束 ---------- */
.page-about .closing {
  position: relative;
  margin-top: 34px;
  padding: 28px 22px 26px;
  background: var(--ink);
  border-radius: 4px;
  overflow: hidden;
}

.page-about .closing__title {
  margin: 0 0 12px;
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(1.25rem, 4.4vw, 1.7rem);
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .closing__text {
  margin: 0;
  max-width: 36em;
  font-size: 0.96rem;
  line-height: 1.9;
  color: var(--on-dark);
}

.page-about .closing__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-about .closing__ghost {
  color: var(--paper);
  border-color: rgba(244, 233, 210, 0.5);
}

/* ---------- 焦点可见性 ---------- */
.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 2px;
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .column-map {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .column-cell {
    grid-column: span 2;
  }

  .page-about .column-cell--wide {
    grid-column: span 3;
  }

  .page-about .versionline__list {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

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

  .page-about .gates__item {
    grid-template-columns: 1fr;
    gap: 6px;
    padding-top: 16px;
    border-top: 2px solid var(--ink);
  }

  .page-about .gates__num {
    grid-row: auto;
    font-size: 1.05rem;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .brand-hero {
    padding: 28px 0 52px;
  }

  .page-about .brand-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: start;
    margin-top: 24px;
  }

  .page-about .brand-hero__stats {
    padding: 24px 22px;
    gap: 20px 18px;
  }

  .page-about .hero-stat__num {
    font-size: 1.5rem;
  }

  .page-about .archive-flow {
    padding: 48px 32px 72px;
    gap: 68px;
  }

  .page-about .flow-section {
    grid-template-columns: var(--ab-rail-lg) minmax(0, 1fr);
    gap: 34px;
  }

  .page-about .flow-mark::before {
    left: 31px;
    bottom: -68px;
  }

  .page-about .flow-node {
    width: 36px;
    height: 36px;
    font-size: 12px;
  }

  .page-about .flow-body h2 {
    margin: 8px 0 18px;
  }

  .page-about .versionline__list {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 2px;
  }

  .page-about .versionline__panel {
    padding: 22px 24px 22px 26px;
  }

  .page-about .closing {
    padding: 38px 34px 34px;
  }
}