/* ===== 品牌档案页 · 页面作用域 ===== */
.page-about {
  --about-nav-w: 156px;
  --about-gap: 40px;
  --ink-paper: #8A6526;
  background: var(--ink);
  color: var(--text-soft);
  overflow-x: hidden;
}

/* ---- 通用件 ---- */
.page-about .about-link {
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid rgba(127, 209, 232, .45);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--copper-lit);
  border-color: var(--copper-lit);
}

.page-about .tick-rule {
  height: 8px;
  border-top: 1px solid var(--steel);
  background-image: repeating-linear-gradient(90deg, var(--steel) 0 1px, transparent 1px 56px);
  background-repeat: repeat-x;
  background-position: left top;
  background-size: auto 7px;
}

/* ---- 首屏 ---- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 28px) 0 40px;
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(51, 65, 92, .5) 0 1px, transparent 1px 84px);
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .85), transparent 76%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .85), transparent 76%);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero__crumbs {
  margin-bottom: 34px;
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
  align-items: end;
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 40px;
  line-height: 1.02;
  letter-spacing: -.02em;
  color: var(--paper);
  max-width: 14em;
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 38em;
  font-size: 17px;
  line-height: 1.75;
  color: var(--text-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--steel);
  border: 1px solid var(--steel);
}

.page-about .about-hero__stats .stat {
  display: grid;
  gap: 6px;
  padding: 16px 14px;
  background: var(--ink-2);
}

.page-about .about-hero__stats .stat__value {
  order: -1;
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  font-weight: 600;
  color: var(--copper-lit);
  letter-spacing: .01em;
}

.page-about .about-hero__stats .stat__label {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
}

.page-about .about-hero__rule {
  margin-top: 44px;
}

/* ---- 主体：索引 + 章节 ---- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  padding-bottom: 88px;
}

.page-about .dossier-index {
  margin: 0 0 32px;
}

.page-about .dossier-index__title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-about .dossier-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .dossier-index__item {
  flex: 0 0 auto;
}

.page-about .dossier-index__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--steel);
  color: var(--mist);
  text-decoration: none;
  font-size: 14px;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .dossier-index__link:hover,
.page-about .dossier-index__link:focus-visible {
  color: var(--copper-lit);
  border-color: var(--copper);
  background: rgba(184, 135, 58, .1);
}

.page-about .dossier-index__code {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--copper);
}

.page-about .dossier-index__label {
  color: inherit;
}

.page-about .about-sections {
  min-width: 0;
  display: grid;
  gap: 0;
}

/* ---- 章节 ---- */
.page-about .dossier-section {
  padding: 34px 0 40px;
}

.page-about .dossier-section__head {
  margin-bottom: 22px;
}

.page-about .chapter-index {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .chapter-index__num {
  display: inline-block;
  padding: 3px 8px;
  border: 1px solid var(--copper);
  color: var(--copper-lit);
  font-size: 12px;
  letter-spacing: .12em;
}

.page-about .dossier-section .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 28px;
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .dossier-section__intro {
  margin: 14px 0 0;
  max-width: 38em;
  font-size: 17px;
  line-height: 1.75;
  color: var(--text-soft);
}

.page-about .dossier-section__body > .prose + .prose {
  margin-top: 16px;
}

.page-about .dossier-section .prose {
  margin: 0;
  max-width: 38em;
  font-size: 17px;
  line-height: 1.75;
  color: var(--text-soft);
}

.page-about .sub-title {
  margin: 34px 0 14px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--paper);
}

/* ---- A-01 岗位刻度 ---- */
.page-about .roster {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--steel);
  border: 1px solid var(--steel);
}

.page-about .roster__item {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "k v"
    "t t";
  gap: 8px 12px;
  align-items: center;
  padding: 14px 14px 16px;
  background: var(--ink-2);
}

.page-about .roster__k {
  grid-area: k;
  font-size: 14px;
  color: var(--paper);
}

.page-about .roster__v {
  grid-area: v;
  font-size: 14px;
  color: var(--copper-lit);
}

.page-about .roster__track {
  grid-area: t;
  display: block;
  height: 6px;
  background: rgba(51, 65, 92, .8);
  box-shadow: inset 0 1px 0 rgba(8, 11, 18, .6);
}

.page-about .roster__fill {
  display: block;
  height: 100%;
  transition: width var(--dur) var(--ease);
}

.page-about .roster__fill--tech {
  width: 52%;
  background: linear-gradient(90deg, var(--copper), var(--copper-lit));
}

.page-about .roster__fill--ops {
  width: 30%;
  background: linear-gradient(90deg, #3E6E7E, var(--ice));
}

.page-about .roster__fill--sup {
  width: 18%;
  background: linear-gradient(90deg, #4E5E4F, var(--moss));
}

/* ---- A-02 研发与知识产权 ---- */
.page-about .ip-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .version-track {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--steel);
  border: 1px solid var(--steel);
}

.page-about .version-track__item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  padding: 14px;
  background: var(--ink-2);
}

.page-about .version-track__no {
  font-size: 14px;
  color: var(--copper-lit);
}

.page-about .version-track__txt {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-soft);
}

.page-about .version-track__item--now {
  background: linear-gradient(180deg, rgba(184, 135, 58, .16), rgba(184, 135, 58, .05));
  box-shadow: inset 2px 0 0 var(--copper);
}

.page-about .version-track__item--now .version-track__txt {
  color: var(--paper);
}

.page-about .ip-split__media {
  margin: 0;
}

/* ---- A-03 资质档案墙 ---- */
.page-about .dossier-section--paper {
  --copper: #8A6526;
  --copper-lit: #6E4F1C;
  background: var(--paper);
  color: var(--ink);
  padding: 30px 20px 34px;
  border: 1px solid var(--steel);
  box-shadow: 0 24px 48px rgba(8, 11, 18, .45);
  margin: 8px 0;
}

.page-about .dossier-section--paper .section-title {
  color: var(--ink);
}

.page-about .dossier-section--paper .dossier-section__intro {
  color: #3B4658;
}

.page-about .chapter-index--on-paper {
  color: #6B7280;
}

.page-about .archive-banner {
  margin: 0 0 26px;
}

.page-about .archive-wall {
  display: block;
}

.page-about .arc-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.page-about .arc-chip {
  display: inline-block;
  padding: 8px 14px;
  border: 1px solid rgba(138, 101, 38, .55);
  color: var(--ink);
  font-size: 14px;
  cursor: pointer;
  user-select: none;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .arc-chip:hover {
  border-color: var(--copper);
  background: rgba(138, 101, 38, .09);
}

.page-about .arc-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .arc-card {
  position: relative;
  padding: 16px 16px 14px;
  background: #FFFDF9;
  border: 1px solid rgba(138, 101, 38, .42);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .95), 0 2px 7px rgba(14, 23, 48, .09);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .arc-card:hover,
.page-about .arc-card:focus-within {
  transform: translateY(-2px);
  border-color: var(--copper);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .95), 0 10px 22px rgba(14, 23, 48, .16);
}

.page-about .arc-card__code {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--copper);
}

.page-about .arc-card__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .arc-card__desc {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.7;
  color: #48536A;
}

.page-about .arc-card__meta {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid rgba(51, 65, 92, .2);
  display: grid;
  gap: 6px;
}

.page-about .arc-card__row {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  font-size: 12px;
  letter-spacing: .02em;
}

.page-about .arc-card__row dt {
  color: #77808F;
}

.page-about .arc-card__row dd {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* 筛选：仅显示选中年度分组的卡片 */
.page-about #arc-band-a:checked ~ .arc-grid .arc-card:not([data-band="a"]),
.page-about #arc-band-b:checked ~ .arc-grid .arc-card:not([data-band="b"]),
.page-about #arc-band-c:checked ~ .arc-grid .arc-card:not([data-band="c"]) {
  display: none;
}

.page-about #arc-band-all:checked ~ .arc-filter .arc-chip[for="arc-band-all"],
.page-about #arc-band-a:checked ~ .arc-filter .arc-chip[for="arc-band-a"],
.page-about #arc-band-b:checked ~ .arc-filter .arc-chip[for="arc-band-b"],
.page-about #arc-band-c:checked ~ .arc-filter .arc-chip[for="arc-band-c"] {
  background: var(--copper);
  color: #FFFDF9;
  border-color: var(--copper);
}

.page-about #arc-band-all:focus-visible ~ .arc-filter .arc-chip[for="arc-band-all"],
.page-about #arc-band-a:focus-visible ~ .arc-filter .arc-chip[for="arc-band-a"],
.page-about #arc-band-b:focus-visible ~ .arc-filter .arc-chip[for="arc-band-b"],
.page-about #arc-band-c:focus-visible ~ .arc-filter .arc-chip[for="arc-band-c"] {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

/* ---- A-04 覆盖与客户结构 ---- */
.page-about .coverage-figure {
  position: relative;
  margin: 26px 0 0;
  border: 1px solid var(--steel);
  overflow: hidden;
}

.page-about .coverage-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(.72) contrast(1.04);
}

.page-about .coverage-figure__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 9px 14px;
  background: rgba(8, 11, 18, .82);
  border-top: 1px solid var(--copper);
  color: var(--paper);
  font-size: 12px;
  letter-spacing: .04em;
}

.page-about .mix-bar {
  display: flex;
  height: 26px;
  border: 1px solid var(--steel);
  background: var(--ink-2);
  overflow: hidden;
}

.page-about .mix-bar__seg {
  display: block;
  height: 100%;
}

.page-about .mix-bar__seg--core {
  flex: 46;
  background: linear-gradient(180deg, var(--copper-lit), var(--copper));
}

.page-about .mix-bar__seg--creative {
  flex: 38;
  background: linear-gradient(180deg, #9ADBEC, var(--ice));
}

.page-about .mix-bar__seg--rest {
  flex: 16;
  background: linear-gradient(180deg, #86998A, var(--moss));
}

.page-about .mix-legend {
  margin: 16px 0 26px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .mix-legend__item {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  font-size: 14px;
  color: var(--text-soft);
}

.page-about .mix-legend__dot {
  width: 10px;
  height: 10px;
  display: block;
}

.page-about .mix-legend__dot--core { background: var(--copper); }
.page-about .mix-legend__dot--creative { background: var(--ice); }
.page-about .mix-legend__dot--rest { background: var(--moss); }

.page-about .mix-legend__num {
  font-size: 14px;
  color: var(--paper);
}

/* ---- A-05 协作网络 ---- */
.page-about .partner-list {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--steel);
  border: 1px solid var(--steel);
}

.page-about .partner-list__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 16px;
  background: var(--ink-2);
}

.page-about .partner-list__no {
  font-size: 14px;
  color: var(--copper-lit);
  letter-spacing: .08em;
}

.page-about .partner-list__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .partner-list__txt {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--text-soft);
}

/* ---- A-06 服务方式 ---- */
.page-about .dossier-section--closing {
  padding-bottom: 0;
}

.page-about .support-grid {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--steel);
  border: 1px solid var(--steel);
}

.page-about .support-grid__item {
  display: grid;
  gap: 8px;
  padding: 15px 16px;
  background: var(--ink-2);
}

.page-about .support-grid__k {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .support-grid__v {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 17px;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .closing-cta {
  margin-top: 30px;
  padding: 26px 20px;
  border: 1px solid var(--copper);
  background:
    linear-gradient(135deg, rgba(184, 135, 58, .16), rgba(14, 23, 48, .2) 62%),
    var(--ink-2);
  box-shadow: inset 0 1px 0 rgba(224, 168, 92, .22);
}

.page-about .closing-cta__text {
  margin: 0 0 20px;
  max-width: 36em;
  font-size: 17px;
  line-height: 1.75;
  color: var(--paper);
}

.page-about .closing-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---- 移动端以上 ---- */
@media (min-width: 640px) {
  .page-about .about-hero__title {
    font-size: 64px;
  }

  .page-about .dossier-section .section-title {
    font-size: 40px;
  }

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

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

  .page-about .dossier-section--paper {
    padding: 38px 30px 42px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: calc(var(--header-h) + 52px);
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(260px, .6fr);
    gap: 48px;
  }

  .page-about .about-hero__stats {
    grid-template-columns: 1fr;
  }

  .page-about .about-body {
    grid-template-columns: var(--about-nav-w) minmax(0, 1fr);
    gap: var(--about-gap);
  }

  .page-about .dossier-index {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
    margin: 34px 0 0;
  }

  .page-about .dossier-index__list {
    display: grid;
    gap: 0;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-about .dossier-index__link {
    border: 0;
    border-left: 1px solid var(--steel);
    padding: 9px 12px;
  }

  .page-about .dossier-index__link:hover,
  .page-about .dossier-index__link:focus-visible {
    border-color: var(--copper);
    background: rgba(184, 135, 58, .08);
  }

  .page-about .ip-split {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .ip-split__media {
    margin-top: 34px;
  }

  .page-about .coverage-figure img {
    max-height: 380px;
  }
}

@media (min-width: 1120px) {
  .page-about .about-hero__title {
    font-size: 96px;
  }

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

  .page-about .dossier-section {
    padding: 44px 0 52px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .arc-card,
  .page-about .dossier-index__link,
  .page-about .arc-chip,
  .page-about .about-link {
    transition: none;
  }
}