/* ============ 品牌档案 / page-about ============ */

.page-about {
  --about-media-radius: calc(var(--radius-lg) * 4);
  --about-label-col: calc(var(--space-8) * 2);
  background-color: var(--color-surface);
  color: var(--color-ink);
  overflow-x: clip;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  letter-spacing: 0.06em;
  line-height: var(--leading-heading);
  margin: 0 0 var(--space-2);
}

.page-about h1 {
  font-size: var(--text-2xl);
}

.page-about h2 {
  font-size: var(--text-xl);
}

.page-about h3 {
  font-size: var(--text-lg);
}

@media (min-width: 560px) {
  .page-about h1 {
    font-size: var(--text-3xl);
  }
}

@media (min-width: 760px) {
  .page-about h1 {
    font-size: var(--text-4xl);
  }

  .page-about h2 {
    font-size: var(--text-2xl);
  }
}

.page-about p {
  max-width: var(--measure);
  margin: 0 0 var(--space-2);
  line-height: var(--leading-body);
}

/* 编号刻度分隔 */
.page-about .rule-index {
  margin-bottom: var(--space-2);
}

.page-about .band--contrast .rule-index {
  color: var(--color-contrast-accent);
}

.page-about .band--primary .rule-index,
.page-about .band--accent .rule-index {
  color: var(--color-primary-ink);
  opacity: 0.78;
}

/* ---------- 首屏 ---------- */

.page-about .about-masthead {
  padding-bottom: calc(var(--section-y) + var(--space-4));
}

.page-about .about-masthead .breadcrumb {
  margin: 0 0 var(--space-6);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  opacity: 0.7;
}

.page-about .about-kicker {
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-contrast-accent);
  margin: 0 0 var(--space-2);
}

.page-about .about-masthead h1 {
  max-width: 20ch;
  color: var(--color-contrast-ink);
  margin-bottom: var(--space-3);
}

.page-about .about-intro {
  font-size: var(--text-lg);
  max-width: 58ch;
  color: var(--color-contrast-ink);
  opacity: 0.84;
  margin-bottom: var(--space-6);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3) var(--space-2);
  margin: 0 0 var(--space-6);
}

.page-about .about-fact {
  margin: 0;
}

.page-about .about-fact dt {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-contrast-ink);
  opacity: 0.62;
  margin-bottom: var(--space-1);
}

.page-about .about-fact dd {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  letter-spacing: 0.02em;
  font-size: var(--text-2xl);
  line-height: 1.04;
  color: var(--color-contrast-accent);
}

@media (min-width: 760px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--space-4);
  }

  .page-about .about-fact dd {
    font-size: var(--text-3xl);
  }
}

/* 章节锚点 */
.page-about .about-anchors__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-anchor {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-contrast-ink);
  background-color: transparent;
  text-decoration: none;
  transition: background-color 0.16s linear, color 0.16s linear;
}

.page-about .about-anchor .mono {
  font-size: var(--text-xs);
  color: var(--color-contrast-accent);
  transition: color 0.16s linear;
}

.page-about .about-anchor:hover,
.page-about .about-anchor:focus-visible,
.page-about .about-anchor[aria-current="true"] {
  background-color: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
}

.page-about .about-anchor:hover .mono,
.page-about .about-anchor:focus-visible .mono,
.page-about .about-anchor[aria-current="true"] .mono {
  color: var(--color-contrast-surface);
}

/* ---------- 通用两栏切分 ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  align-items: start;
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: var(--space-8);
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  }

  .page-about .about-split--reverse .about-split__text {
    order: 2;
  }

  .page-about .about-split--reverse .about-split__figure {
    order: 1;
  }
}

.page-about .media {
  margin: 0;
  border-radius: var(--about-media-radius);
  overflow: hidden;
  background-color: var(--color-surface-deep);
}

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

/* ---------- 定位清单 ---------- */

.page-about .about-checklist {
  margin: var(--space-3) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--space-2);
}

.page-about .about-checklist li {
  position: relative;
  padding-left: var(--space-3);
  max-width: var(--measure);
  line-height: var(--leading-body);
}

.page-about .about-checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: var(--space-2);
  height: var(--border-thick);
  background-color: var(--color-primary);
}

/* ---------- 小组分工 ---------- */

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-4);
}

@media (min-width: 760px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr) minmax(0, 1fr);
    gap: var(--space-3);
  }
}

.page-about .about-team__col {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.page-about .about-team__col::before {
  content: "";
  display: block;
  width: var(--space-3);
  height: var(--space-1);
  background-color: var(--color-primary);
}

.page-about .about-team__col:nth-child(2)::before {
  background-color: var(--color-accent);
}

.page-about .about-team__col:nth-child(3)::before {
  background-color: var(--color-ink-muted);
}

.page-about .about-team__col h3 {
  margin: 0;
  font-size: var(--text-base);
}

.page-about .about-team__col p {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  line-height: var(--leading-body);
}

/* ---------- 维护历程 ---------- */

.page-about .about-stages__lead {
  color: var(--color-contrast-ink);
  opacity: 0.78;
  margin-bottom: var(--space-6);
}

.page-about .about-track {
  list-style: none;
  margin: 0 0 var(--space-6);
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
}

@media (min-width: 900px) {
  .page-about .about-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-bottom: var(--space-8);
  }
}

.page-about .about-track__node {
  padding: var(--space-3);
  background-color: color-mix(in srgb, var(--color-contrast-ink) 7%, transparent);
  outline-offset: 2px;
  transition: background-color 0.2s linear;
}

.page-about .about-track__node:hover,
.page-about .about-track__node:focus-visible {
  background-color: color-mix(in srgb, var(--color-contrast-accent) 14%, transparent);
}

.page-about .about-track__node::before {
  content: "";
  display: block;
  width: var(--space-6);
  height: var(--space-1);
  background-color: var(--color-contrast-accent);
  margin-bottom: var(--space-3);
}

.page-about .about-track__ver {
  display: block;
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-contrast-accent);
  margin-bottom: var(--space-2);
}

.page-about .about-track__node h3 {
  font-size: var(--text-lg);
  color: var(--color-contrast-ink);
  margin: 0 0 var(--space-2);
}

.page-about .about-track__node > p {
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
  opacity: 0.76;
  margin: 0;
  max-width: none;
}

.page-about .about-track__node > .about-track__extra {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin-top: 0;
  transition: max-height 0.24s ease-out, opacity 0.24s ease-out, margin-top 0.24s ease-out;
}

.page-about .about-track__node:hover > .about-track__extra,
.page-about .about-track__node:focus > .about-track__extra,
.page-about .about-track__node:focus-within > .about-track__extra {
  max-height: 10em;
  opacity: 1;
  margin-top: var(--space-2);
}

@media (hover: none) {
  .page-about .about-track__node > .about-track__extra {
    max-height: none;
    opacity: 1;
    margin-top: var(--space-2);
  }
}

.page-about .about-stages__figure {
  margin: 0;
}

/* ---------- 编审机制 ---------- */

.page-about .about-steps {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.page-about .about-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-2);
  align-items: start;
}

.page-about .about-step__no {
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-primary);
  padding-top: 0.25em;
}

.page-about .about-step__body h3 {
  margin: 0 0 var(--space-1);
  font-size: var(--text-base);
}

.page-about .about-step__body p {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  line-height: var(--leading-body);
}

/* ---------- 内容原则 ---------- */

.page-about .about-principles__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
  margin-top: var(--space-4);
}

@media (min-width: 760px) {
  .page-about .about-principles__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: var(--space-4);
  }
}

.page-about .about-principles__col {
  padding: var(--space-4);
  background-color: color-mix(in srgb, var(--color-contrast-surface) 14%, transparent);
}

.page-about .about-principles__col--blocked {
  background-color: color-mix(in srgb, var(--color-contrast-surface) 30%, transparent);
}

.page-about .about-principles__col h3 {
  font-size: var(--text-xl);
  color: var(--color-primary-ink);
  margin: 0 0 var(--space-3);
}

.page-about .about-principles__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
}

.page-about .about-principles__list li {
  position: relative;
  padding-left: var(--space-3);
  max-width: var(--measure);
  line-height: var(--leading-body);
  color: var(--color-primary-ink);
  opacity: 0.94;
}

.page-about .about-principles__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: var(--space-2);
  height: var(--border-thick);
  background-color: var(--color-primary-ink);
}

/* ---------- 运营节奏 ---------- */

.page-about .about-cadence__list {
  margin: 0 0 var(--space-6);
  display: grid;
  gap: 0;
}

.page-about .about-cadence__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-1);
  padding: var(--space-3);
}

.page-about .about-cadence__item:nth-child(odd) {
  background-color: var(--color-surface);
}

@media (min-width: 760px) {
  .page-about .about-cadence__item {
    grid-template-columns: var(--about-label-col) minmax(0, 1fr);
    gap: var(--space-4);
    align-items: baseline;
    padding: var(--space-4);
  }
}

.page-about .about-cadence__item dt {
  margin: 0;
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  font-weight: var(--weight-heading);
  color: var(--color-accent);
}

.page-about .about-cadence__item dd {
  margin: 0;
  max-width: var(--measure);
  line-height: var(--leading-body);
}

.page-about .about-contact {
  padding: var(--space-4);
  background-color: var(--color-surface);
}

.page-about .about-contact h3 {
  font-size: var(--text-xl);
  margin: 0 0 var(--space-2);
}

.page-about .about-contact > p {
  color: var(--color-ink-soft);
}

.page-about .about-contact__list {
  list-style: none;
  margin: var(--space-3) 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
}

.page-about .about-contact__list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-1);
}

@media (min-width: 760px) {
  .page-about .about-contact__list li {
    grid-template-columns: var(--about-label-col) minmax(0, 1fr);
    gap: var(--space-4);
    align-items: baseline;
  }
}

.page-about .about-contact__list .mono {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.page-about .about-contact__note {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  margin-bottom: 0;
}

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

/* ---------- 继续查阅 ---------- */

.page-about .about-more__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-2);
  margin-top: var(--space-4);
}

@media (min-width: 640px) {
  .page-about .about-more__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1040px) {
  .page-about .about-more__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-more__link {
  display: block;
  padding: var(--space-4);
  color: var(--color-accent-ink);
  text-decoration: none;
  background-color: color-mix(in srgb, var(--color-contrast-surface) 16%, transparent);
  transition: background-color 0.18s linear;
}

.page-about .about-more__link:hover,
.page-about .about-more__link:focus-visible {
  background-color: color-mix(in srgb, var(--color-contrast-surface) 36%, transparent);
}

.page-about .about-more__k {
  display: block;
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-accent-ink);
  opacity: 0.72;
  margin-bottom: var(--space-2);
}

.page-about .about-more__link h3 {
  font-size: var(--text-xl);
  color: var(--color-accent-ink);
  margin: 0 0 var(--space-1);
}

.page-about .about-more__link p {
  margin: 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-accent-ink);
  opacity: 0.88;
}

/* ---------- 显现动效 ---------- */

.has-js .page-about [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.4s ease-out, transform 0.4s ease-out;
}

.has-js .page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .has-js .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .about-track__node,
  .page-about .about-anchor,
  .page-about .about-more__link {
    transition: none;
  }
}