/* ============================================================
   品牌总览 /overview/  —— 页面专属样式（作用域 .page-about）
   ============================================================ */

.page-about .about-hero {
  position: relative;
  padding: clamp(1.75rem, 5vw, 4.5rem) 0 clamp(2.25rem, 5vw, 4rem);
  border-bottom: var(--bd);
  background:
    radial-gradient(120% 95% at 88% 0%, rgba(53, 224, 214, 0.14), transparent 58%),
    radial-gradient(90% 70% at 8% 100%, rgba(224, 180, 92, 0.09), transparent 60%),
    linear-gradient(180deg, rgba(18, 41, 61, 0.72), transparent 72%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(36, 69, 95, 0.42) 1px, transparent 1px),
    linear-gradient(90deg, rgba(36, 69, 95, 0.42) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: 0.35;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, #000, transparent 88%);
  mask-image: linear-gradient(180deg, #000, transparent 88%);
}

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

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.75rem, 4vw, 3.5rem);
}

.page-about .about-hero__copy {
  min-width: 0;
}

/* ---- 面包屑 ---- */
.page-about .about-crumbs {
  margin: 0 0 1.35rem;
}

.page-about .about-crumbs .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .about-crumbs .crumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-crumbs .crumbs a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-crumbs .crumbs li + li::before {
  content: "/";
  margin-right: 0.45rem;
  color: var(--line);
}

/* ---- 首屏文字 ---- */
.page-about .about-hero h1 {
  margin: 0.55rem 0 1rem;
  font-size: clamp(1.9rem, 5.2vw, 3.15rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  max-width: 36em;
  margin: 0;
  font-size: clamp(1rem, 1.5vw, 1.0625rem);
  line-height: 1.9;
  color: var(--paper);
}

/* ---- 首屏数字条 ---- */
.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.1rem 1.25rem;
  margin: 2.15rem 0 0;
  padding: 1.35rem 0 0;
  border-top: var(--bd);
}

.page-about .about-hero__facts dt {
  margin: 0 0 0.4rem;
}

.page-about .about-hero__facts dd {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1.1;
  color: var(--paper);
}

.page-about .about-hero__facts dd.ver {
  color: var(--gold);
}

/* ---- 首屏图片 ---- */
.page-about .about-hero__figure {
  margin: 0;
  border: var(--bd);
  background: var(--ink-2);
  box-shadow: var(--hard);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.94) contrast(1.02);
}

.page-about .about-hero__figure figcaption {
  padding: 0.6rem 0.85rem;
  border-top: var(--bd);
  background: var(--ink-3);
}

/* ============================================================
   通用正文引导句
   ============================================================ */
.page-about .about-lead {
  max-width: 62ch;
  margin: 0 0 1.5rem;
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--muted);
}

/* ============================================================
   01 我们一直在做的一件事
   ============================================================ */
.page-about .about-mission__body {
  max-width: 70ch;
}

.page-about .about-mission__body p {
  color: var(--paper);
}

.page-about .about-mission .btn-row {
  margin-top: 1.85rem;
}

/* ============================================================
   02 纵向时间轴
   ============================================================ */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 2.9rem;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0.65rem;
  top: 0.5rem;
  bottom: 1.4rem;
  width: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--line) 26%, var(--line) 100%);
}

.page-about .about-stage {
  position: relative;
  padding-bottom: 2.35rem;
}

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

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -2.4rem;
  top: 0.5rem;
  width: 12px;
  height: 12px;
  border: 2px solid var(--line);
  background: var(--ink-2);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.page-about .about-stage--current::before {
  border-color: var(--gold);
  background: var(--gold);
  box-shadow: 0 0 0 5px rgba(224, 180, 92, 0.18);
}

.page-about .about-stage:hover::before {
  border-color: var(--cyan);
  background: var(--cyan);
}

.page-about .about-stage__index {
  margin: 0 0 0.4rem;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .about-stage__title {
  margin: 0 0 0.6rem;
  font-size: clamp(1.08rem, 2.3vw, 1.32rem);
  font-weight: 800;
  line-height: 1.45;
  color: var(--paper);
  transition: color var(--dur) var(--ease);
}

.page-about .about-stage:hover .about-stage__title {
  color: var(--gold-soft);
}

.page-about .about-stage__text {
  max-width: 62ch;
  margin: 0;
  line-height: 1.9;
  color: var(--muted);
}

/* ============================================================
   03 栏目结构全景
   ============================================================ */
.page-about .about-structure__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin: 0 0 2.5rem;
}

.page-about .about-cat {
  display: block;
  padding: 1.2rem 1.2rem 1.35rem;
  border: var(--bd);
  background: var(--ink-2);
  box-shadow: var(--hard);
  text-decoration: none;
  color: inherit;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.page-about .about-cat:hover,
.page-about .about-cat:focus-visible {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .about-cat__count {
  display: block;
  font-size: 1.65rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--gold);
}

.page-about .about-cat__name {
  margin: 0.7rem 0 0.45rem;
  font-size: 1.04rem;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-cat__desc {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-cat--version {
  border-color: var(--amber);
  box-shadow: 6px 6px 0 rgba(242, 166, 59, 0.2);
}

.page-about .about-cat--version .about-cat__count {
  color: var(--amber);
}

.page-about .about-structure__figure {
  margin: 0;
  border: var(--bd);
  background: var(--ink-2);
}

.page-about .about-structure__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-structure__figure figcaption {
  padding: 0.6rem 0.85rem;
  border-top: var(--bd);
  background: var(--ink-3);
}

/* ============================================================
   04 谁在维护这些说明
   ============================================================ */
.page-about .about-team__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-bar {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.45rem 0.75rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-bar:first-child {
  border-top: 1px solid var(--line);
}

.page-about .about-bar__label {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-bar__num {
  grid-row: 1;
  grid-column: 2;
  align-self: center;
  margin: 0;
  font-size: 0.85rem;
  color: var(--gold);
}

.page-about .about-bar__track {
  grid-column: 1 / -1;
  height: 8px;
  background: var(--ink-3);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-bar__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--gold));
  transition: width 320ms var(--ease);
}

.page-about .about-bar__fill--5 { width: 35.7%; }
.page-about .about-bar__fill--4 { width: 28.6%; }
.page-about .about-bar__fill--3 { width: 21.4%; }
.page-about .about-bar__fill--2 { width: 14.3%; }

.page-about .about-team__flow h3 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--gold);
}

.page-about .about-flow {
  list-style: none;
  margin: 1.1rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.page-about .about-flow li {
  position: relative;
  padding-left: 2.5rem;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--paper);
}

.page-about .about-flow li::before {
  content: attr(data-step);
  position: absolute;
  left: 0;
  top: 0.16rem;
  padding: 0.12rem 0.4rem;
  border: 1px solid var(--line);
  background: var(--ink-3);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

/* ============================================================
   05 每个月的更新节奏
   ============================================================ */
.page-about .about-cadence__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 3.5vw, 2.75rem);
}

.page-about .about-stat {
  padding: 0.9rem 0 1.05rem;
  border-bottom: 1px solid var(--line);
}

.page-about .about-stat:first-child {
  border-top: 1px solid var(--line);
}

.page-about .about-stat__num {
  margin: 0;
  font-size: clamp(1.55rem, 4vw, 1.95rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--gold);
}

.page-about .about-stat__label {
  margin: 0.45rem 0 0;
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-cadence__text p {
  color: var(--paper);
}

.page-about .about-cadence__figure {
  margin: clamp(1.75rem, 4vw, 2.75rem) 0 0;
  border: var(--bd);
  background: var(--ink-2);
  box-shadow: var(--hard);
}

.page-about .about-cadence__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-cadence__figure figcaption {
  padding: 0.6rem 0.85rem;
  border-top: var(--bd);
  background: var(--ink-3);
}

/* ============================================================
   06 接下来去哪
   ============================================================ */
.page-about .about-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-about .about-next__item {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding: 1.2rem 1.2rem 1.35rem;
  border: var(--bd);
  background: var(--ink-2);
  box-shadow: var(--hard);
  text-decoration: none;
  color: inherit;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-next__item:hover,
.page-about .about-next__item:focus-visible {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .about-next__item .tag {
  align-self: flex-start;
}

.page-about .about-next__item h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 800;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-next__item p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ============================================================
   键盘焦点
   ============================================================ */
.page-about a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ============================================================
   响应式
   ============================================================ */
@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
  }

  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
  }

  .page-about .about-cadence__grid {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-structure__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-next__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 480px) {
  .page-about .about-timeline {
    padding-left: 2.1rem;
  }

  .page-about .about-timeline::before {
    left: 0.45rem;
  }

  .page-about .about-stage::before {
    left: -1.87rem;
    width: 10px;
    height: 10px;
  }

  .page-about .about-flow li {
    padding-left: 2.2rem;
  }
}

/* ============================================================
   低动效降级
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-cat,
  .page-about .about-next__item,
  .page-about .about-bar__fill,
  .page-about .about-stage::before,
  .page-about .about-stage__title,
  .page-about .about-crumbs .crumbs a {
    transition: none;
  }

  .page-about .about-cat:hover,
  .page-about .about-next__item:hover {
    transform: none;
  }
}