/* ===== 页面专属：page-about ===== */
.page-about {
  --about-gutter: clamp(20px, 4vw, 56px);
  overflow-x: hidden;
}

.page-about .section {
  box-sizing: border-box;
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: 64px var(--about-gutter);
}

/* ---------- 框景封面 ---------- */
.page-about .about-cover {
  box-sizing: border-box;
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: calc(var(--header-h) + 24px) var(--about-gutter) 32px;
}

.page-about .about-cover__inner {
  position: relative;
  box-sizing: border-box;
  padding: clamp(48px, 8vw, 92px) clamp(20px, 4vw, 72px) clamp(40px, 6vw, 64px);
  background:
    linear-gradient(160deg, rgba(127, 0, 255, 0.16), transparent 44%),
    repeating-linear-gradient(0deg, transparent 0 22px, rgba(168, 178, 209, 0.04) 22px 23px),
    var(--c-bg-2);
  border: 1px solid var(--c-border);
  border-left: 4px solid var(--c-accent);
  box-shadow: 12px 12px 0 rgba(0, 0, 0, 0.22);
  overflow: hidden;
}

.page-about .about-cover__inner::before {
  content: "";
  position: absolute;
  inset: 14px;
  border: 1px solid rgba(127, 0, 255, 0.24);
  pointer-events: none;
}

.page-about .about-cover__inner::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--c-neon) 50%, transparent);
  opacity: 0.7;
}

.page-about .about-cover__crumbs {
  position: relative;
  z-index: 1;
  margin-bottom: 28px;
  font-size: 13px;
}

.page-about .about-cover__crumbs a {
  color: var(--c-text-2);
  text-decoration: none;
}

.page-about .about-cover__crumbs a:hover {
  color: var(--c-neon);
}

.page-about .about-cover__meta {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 36px;
  font-family: var(--font-headline);
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--c-text-2);
}

.page-about .about-cover__status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--c-border);
  border-radius: 999px;
  color: var(--c-text);
}

.page-about .about-cover__status .status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-neon);
  box-shadow: 0 0 12px var(--c-neon);
}

.page-about .about-cover__brand {
  position: relative;
  z-index: 1;
  margin: 0 0 10px;
  font-family: var(--font-headline);
  font-size: 14px;
  letter-spacing: 6px;
  color: var(--c-accent);
  text-transform: uppercase;
}

.page-about .about-cover__title {
  position: relative;
  z-index: 1;
  margin: 0;
  font-family: var(--font-headline);
  font-size: clamp(34px, 8vw, 76px);
  line-height: 1.1;
  letter-spacing: -1px;
}

.page-about .about-cover__subtitle {
  position: relative;
  z-index: 1;
  margin: 10px 0 0;
  font-family: var(--font-headline);
  font-size: clamp(18px, 3vw, 28px);
  letter-spacing: 2px;
  color: var(--c-text);
}

.page-about .about-cover__lead {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 24px 0 32px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-text-2);
}

.page-about .about-cover__actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* 封面目录索引 */
.page-about .about-cover__index {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--c-border);
}

.page-about .about-cover__index a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid var(--c-border);
  background: var(--c-bg);
  color: var(--c-text-2);
  font-family: var(--font-headline);
  font-size: 12px;
  letter-spacing: 1px;
  text-decoration: none;
  transition: border-color var(--transition), color var(--transition);
}

.page-about .about-cover__index a:hover {
  border-color: var(--c-accent);
  color: var(--c-text);
}

.page-about .about-cover__index span {
  color: var(--c-accent);
}

.page-about .about-cover__tick {
  position: absolute;
  bottom: 18px;
  left: 18px;
  width: 36px;
  height: 36px;
  border-bottom: 1px solid var(--c-neon);
  border-right: 1px solid var(--c-neon);
  opacity: 0.5;
  pointer-events: none;
}

/* ---------- 章节标题体系 ---------- */
.page-about .about-chapter-head {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 40px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--c-border);
}

.page-about .about-chapter-num {
  font-family: var(--font-headline);
  font-size: clamp(64px, 14vw, 120px);
  line-height: 0.9;
  color: rgba(127, 0, 255, 0.28);
  -webkit-text-stroke: 1px rgba(127, 0, 255, 0.65);
  user-select: none;
}

.page-about .about-chapter-kicker {
  margin: 8px 0 4px;
  font-family: var(--font-headline);
  font-size: 12px;
  letter-spacing: 3px;
  color: var(--c-accent);
  text-transform: uppercase;
}

.page-about .about-chapter-title h2 {
  margin: 0;
  font-family: var(--font-headline);
  font-size: clamp(28px, 5vw, 44px);
  line-height: 1.2;
}

/* ---------- 品牌档案 ---------- */
.page-about .about-profile__layout {
  display: grid;
  gap: 32px;
}

.page-about .about-profile__article p {
  margin: 0 0 18px;
  color: var(--c-text-2);
  line-height: 1.8;
}

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

.page-about .about-profile__item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 16px;
  background: var(--c-bg);
}

.page-about .about-profile__item dt {
  color: var(--c-accent);
  font-family: var(--font-headline);
  font-size: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.page-about .about-profile__item dd {
  margin: 0;
  text-align: right;
  color: var(--c-text);
  font-size: 14px;
}

/* ---------- 通用图片帧 ---------- */
.page-about .about-media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--c-border);
  background: var(--c-bg-2);
}

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

.page-about .about-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 55%, rgba(127, 0, 255, 0.14));
  pointer-events: none;
}

.page-about .about-media figcaption {
  position: relative;
  z-index: 1;
  padding: 12px 16px;
  border-top: 1px solid var(--c-border);
  font-size: 12px;
  letter-spacing: 1px;
  color: var(--c-text-2);
}

.page-about .about-media--profile {
  aspect-ratio: 16 / 9;
}

.page-about .about-media--timeline {
  aspect-ratio: 3 / 2;
}

.page-about .about-media--scale {
  aspect-ratio: 4 / 3;
}

/* ---------- 快捷入口进化史 ---------- */
.page-about .about-evolution {
  border-top: 1px dashed var(--c-border);
  border-bottom: 1px dashed var(--c-border);
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0 0 40px;
  padding: 0 0 0 32px;
  border-left: 1px solid var(--c-border);
}

.page-about .about-timeline__item {
  --tl-dot: 10px;
  position: relative;
  margin-bottom: 32px;
  padding: 24px 20px;
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  border-left: 0;
  transition: border-color var(--transition);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: 28px;
  left: calc(-32px - var(--tl-dot) / 2);
  width: var(--tl-dot);
  height: var(--tl-dot);
  border-radius: 50%;
  background: var(--c-accent);
  border: 2px solid var(--c-bg);
  box-shadow: 0 0 8px rgba(127, 0, 255, 0.6);
}

.page-about .about-timeline__item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: var(--c-accent);
}

.page-about .about-timeline__item:hover {
  border-color: var(--c-accent);
}

.page-about .about-timeline__era {
  display: inline-block;
  padding: 4px 12px;
  font-family: var(--font-headline);
  font-size: 12px;
  letter-spacing: 2px;
  background: linear-gradient(135deg, var(--c-accent), #4a00ff);
  color: var(--c-text);
  transform: skewX(-12deg);
}

.page-about .about-timeline__item h3 {
  margin: 16px 0 8px;
  font-family: var(--font-headline);
  font-size: 22px;
  line-height: 1.2;
}

.page-about .about-timeline__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-text-2);
}

/* ---------- 平台数据与规模 ---------- */
.page-about .about-stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 40px;
}

.page-about .about-stat {
  position: relative;
  padding: 28px 20px 24px;
  background:
    linear-gradient(160deg, rgba(127, 0, 255, 0.14), transparent 55%),
    var(--c-bg-2);
  border: 1px solid var(--c-border);
  overflow: hidden;
}

.page-about .about-stat::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--c-accent), transparent 80%);
}

.page-about .about-stat::after {
  content: "";
  position: absolute;
  right: -30px;
  bottom: -30px;
  width: 90px;
  height: 90px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(127, 0, 255, 0.3), transparent 70%);
  pointer-events: none;
}

.page-about .about-stat__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-headline);
  font-size: clamp(30px, 6vw, 52px);
  line-height: 1;
  color: var(--c-text);
  text-shadow: 0 0 24px rgba(127, 0, 255, 0.55);
}

.page-about .about-stat__label {
  display: block;
  font-family: var(--font-headline);
  font-size: 13px;
  letter-spacing: 1px;
  color: var(--c-text);
}

.page-about .about-stat__hint {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  color: var(--c-text-2);
}

.page-about .about-scale__note {
  margin-top: 32px;
  padding: 20px 24px;
  border-left: 3px solid var(--c-neon);
  background: rgba(57, 255, 20, 0.06);
  color: var(--c-text-2);
  line-height: 1.8;
}

/* ---------- 生态与合作 ---------- */
.page-about .about-eco__layout {
  display: grid;
  gap: 28px;
}

.page-about .about-eco__text p {
  margin: 0;
  color: var(--c-text-2);
  line-height: 1.8;
}

.page-about .about-eco__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-eco__card {
  position: relative;
  padding: 24px 20px 20px;
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  transition: border-color var(--transition), transform var(--transition);
}

.page-about .about-eco__card:hover {
  transform: translateY(-4px);
  border-color: var(--c-accent);
}

.page-about .about-eco__tag {
  display: inline-block;
  padding: 4px 10px;
  margin-bottom: 14px;
  border-radius: 2px;
  background: var(--c-accent);
  color: var(--c-bg);
  font-family: var(--font-headline);
  font-size: 11px;
  letter-spacing: 1px;
}

.page-about .about-eco__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-headline);
  font-size: 20px;
  line-height: 1.3;
}

.page-about .about-eco__card p {
  margin: 0;
  color: var(--c-text-2);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .about-eco__footer {
  margin: 0;
  padding: 18px 20px;
  border: 1px dashed var(--c-border);
  color: var(--c-text-2);
  font-size: 14px;
  line-height: 1.7;
}

/* ---------- 资质与备案 ---------- */
.page-about .about-qualification__layout {
  display: grid;
  gap: 28px;
}

.page-about .about-qualification__badge {
  position: relative;
  padding: 40px 28px;
  background:
    repeating-linear-gradient(0deg, transparent 0 14px, rgba(168, 178, 209, 0.05) 14px 15px),
    var(--c-bg-2);
  border: 1px solid var(--c-border);
  border-top: 3px solid var(--c-accent);
  text-align: center;
}

.page-about .about-qualification__icp {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-headline);
  font-size: clamp(22px, 5vw, 40px);
  letter-spacing: 2px;
  color: var(--c-text);
}

.page-about .about-qualification__badge p {
  margin: 0;
  color: var(--c-text-2);
  line-height: 1.7;
}

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

.page-about .about-qualification__list > div {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 12px;
  padding: 14px 16px;
  background: var(--c-bg);
}

.page-about .about-qualification__list dt {
  color: var(--c-accent);
  font-size: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.page-about .about-qualification__list dd {
  margin: 0;
  color: var(--c-text);
  font-size: 14px;
  word-break: break-word;
}

.page-about .about-qualification__note {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-top: 24px;
  padding: 20px 24px;
  border-left: 4px solid var(--c-neon);
  background: rgba(57, 255, 20, 0.05);
}

.page-about .about-qualification__note p {
  margin: 0;
  max-width: 720px;
  color: var(--c-text-2);
  font-size: 14px;
  line-height: 1.7;
}

/* ---------- 响应式增强 ---------- */
@media (min-width: 768px) {
  .page-about .section {
    padding-top: 88px;
    padding-bottom: 88px;
  }

  .page-about .about-profile__layout {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: start;
  }

  .page-about .about-profile__list {
    grid-column: 1 / -1;
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-timeline {
    padding-left: 40px;
  }

  .page-about .about-timeline__item::before {
    left: calc(-40px - var(--tl-dot) / 2);
  }

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

  .page-about .about-qualification__layout {
    grid-template-columns: 0.8fr 1.2fr;
    align-items: stretch;
  }

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

@media (min-width: 1024px) {
  .page-about .about-stat-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}