/* ==========================================================
   page-about · 品牌故事与数据运营体系
   作用域：.page-about 专属样式，移动端优先
   ========================================================== */
.page-about {
  --about-grid: rgba(0, 229, 255, 0.07);
  --about-grid-size: 28px;
  --about-cut: 12px;
  background: var(--c-bg);
  color: var(--c-text);
}

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

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  font-size: 0.875rem;
  color: var(--c-text-dim);
  margin-bottom: 28px;
}

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

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  text-decoration: underline;
}

.page-about .breadcrumb__sep {
  margin: 0 8px;
  color: var(--c-line);
}

/* ---------- 页头 ---------- */
.page-about .about-hero {
  padding: 24px 0 64px;
  background:
    linear-gradient(var(--about-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid) 1px, transparent 1px),
    var(--c-bg);
  background-size: var(--about-grid-size) var(--about-grid-size);
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 40px;
  margin-top: 32px;
}

.page-about .about-hero__kicker {
  font-family: var(--f-mono);
  color: var(--c-accent);
  letter-spacing: 0.12em;
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  margin: 0 0 16px;
}

.page-about .about-hero__title {
  font-family: var(--f-headline);
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.15;
  letter-spacing: 0.02em;
  max-width: 16em;
  margin: 0 0 24px;
  padding-left: 16px;
  border-left: 4px solid var(--c-accent);
}

.page-about .about-hero__lead {
  font-size: 1.0625rem;
  color: var(--c-text-dim);
  max-width: 46em;
  line-height: 1.8;
  margin: 0 0 32px;
}

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

/* ---------- 页头数据卡片 ---------- */
.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.page-about .hero-fact {
  border: 1px solid var(--c-line);
  background: var(--c-card);
  padding: 20px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.page-about .hero-fact--primary {
  border-color: var(--c-accent);
  box-shadow: 0 0 0 1px var(--c-accent), var(--c-glow);
}

.page-about .hero-fact__num {
  font-family: var(--f-mono);
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 800;
  color: var(--c-data);
  line-height: 1;
}

.page-about .hero-fact--primary .hero-fact__num {
  color: var(--c-accent);
}

.page-about .hero-fact__label {
  color: var(--c-text-dim);
  font-size: 0.875rem;
  line-height: 1.4;
}

/* ---------- 章节头部 ---------- */
.page-about .section__header {
  margin-bottom: 40px;
}

.page-about .section__index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--f-mono);
  font-weight: 800;
  font-size: 0.875rem;
  color: var(--c-bg);
  background: var(--c-accent);
  padding: 6px 14px 6px 12px;
  margin-bottom: 18px;
  clip-path: polygon(0 0, 100% 0, calc(100% - var(--about-cut)) 100%, 0 100%);
  letter-spacing: 0.08em;
}

.page-about .section__title {
  margin: 0 0 12px;
  font-family: var(--f-headline);
  font-size: var(--text-h2);
  line-height: 1.2;
}

.page-about .section__lead {
  color: var(--c-text-dim);
  font-size: 1rem;
  line-height: 1.7;
  max-width: 42em;
  margin: 0;
}

/* ---------- 章节 01：品牌关系 ---------- */
.page-about .brand-relation__grid {
  display: grid;
  gap: 40px;
}

.page-about .brand-relation__text p {
  color: var(--c-text);
  line-height: 1.8;
  margin: 0 0 20px;
  font-size: 1rem;
}

.page-about .relation-list {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  border-top: 1px solid var(--c-line);
}

.page-about .relation-list li {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--c-line);
  min-width: 0;
}

.page-about .relation-list span {
  font-family: var(--f-mono);
  color: var(--c-accent);
  font-size: 0.875rem;
}

.page-about .brand-relation__visual {
  background:
    linear-gradient(var(--about-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid) 1px, transparent 1px),
    var(--c-bg-deep);
  background-size: 24px 24px;
  border: 1px solid var(--c-line);
  padding: 24px;
  position: relative;
  display: flex;
  align-items: center;
}

.page-about .brand-relation__visual::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid var(--c-line);
  pointer-events: none;
}

.page-about .rel-diagram {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 6px;
  width: 100%;
  z-index: 1;
}

.page-about .rel-diagram__node {
  border: 2px solid var(--c-line);
  background: var(--c-card);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
  transition: border-color var(--tr);
}

.page-about .rel-diagram__node--team {
  border-left: 4px solid var(--c-accent);
}

.page-about .rel-diagram__node--brand {
  border-right: 4px solid var(--c-accent-2);
}

.page-about .rel-diagram__type {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--c-text-dim);
  text-transform: uppercase;
}

.page-about .rel-diagram__name {
  font-family: var(--f-headline);
  font-style: italic;
  font-size: 1.5rem;
  letter-spacing: 0.02em;
}

.page-about .rel-diagram__desc {
  color: var(--c-text-dim);
  font-size: 0.875rem;
}

.page-about .rel-diagram__arrow {
  display: flex;
  justify-content: center;
  align-items: center;
  color: var(--c-accent);
  font-family: var(--f-mono);
  font-size: 1.25rem;
  padding: 4px 0;
}

.page-about .rel-diagram__arrow span {
  display: block;
  transform: rotate(90deg);
  transition: transform var(--tr);
}

/* ---------- 章节 02：数据运营里程 ---------- */
.page-about .milestone-list {
  position: relative;
  margin-top: 8px;
}

.page-about .milestone-item {
  position: relative;
  padding-left: 56px;
  padding-bottom: 44px;
  min-width: 0;
}

.page-about .milestone-item:last-child {
  padding-bottom: 28px;
}

.page-about .milestone-item::before {
  content: "";
  position: absolute;
  left: 17px;
  top: 6px;
  width: 2px;
  height: calc(100% - 20px);
  background: var(--c-line);
}

.page-about .milestone-item:last-child::before {
  display: none;
}

.page-about .milestone-item__marker {
  position: absolute;
  left: 8px;
  top: 6px;
  width: 20px;
  height: 20px;
  background: var(--c-accent);
  transform: rotate(45deg);
  z-index: 1;
  box-shadow: 0 0 12px var(--c-glow);
  transition: transform var(--tr), box-shadow var(--tr);
}

.page-about .milestone-item:nth-child(even) .milestone-item__marker {
  background: var(--c-accent-2);
}

.page-about .milestone-item:hover .milestone-item__marker,
.page-about .milestone-item:focus-within .milestone-item__marker {
  transform: rotate(45deg) scale(1.18);
  box-shadow: 0 0 0 6px var(--c-glow), 0 0 18px rgba(0, 229, 255, 0.4);
}

.page-about .milestone-item:hover .milestone-item__content,
.page-about .milestone-item:focus-within .milestone-item__content {
  transform: translateX(4px);
}

.page-about .milestone-item__year {
  font-family: var(--f-mono);
  font-weight: 800;
  font-size: 1.125rem;
  color: var(--c-data);
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}

.page-about .milestone-item__year::after {
  content: "";
  display: inline-block;
  width: 24px;
  height: 2px;
  background: var(--c-data);
  vertical-align: middle;
  margin-left: 10px;
}

.page-about .milestone-item__content {
  transition: transform var(--tr);
}

.page-about .milestone-item__content h3 {
  font-family: var(--f-headline);
  font-size: 1.25rem;
  font-style: italic;
  margin: 0 0 6px;
}

.page-about .milestone-item__content p {
  color: var(--c-text-dim);
  line-height: 1.7;
  font-size: 0.9375rem;
  margin: 0;
}

.page-about .milestone-figure {
  margin: 8px 0 0;
  border: 1px solid var(--c-line);
  background: var(--c-card);
  padding: 8px;
}

.page-about .milestone-figure img {
  display: block;
  width: 100%;
}

/* ---------- 章节 03：七类复盘体系 ---------- */
.page-about .classes-evolution {
  display: grid;
  gap: 16px;
  margin-bottom: 48px;
}

.page-about .evo-panel {
  border: 1px solid var(--c-line);
  background: var(--c-card);
  padding: 20px 24px;
}

.page-about .evo-panel h3 {
  font-family: var(--f-headline);
  font-size: 1.125rem;
  margin: 0 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--c-line);
}

.page-about .evo-panel ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .evo-panel li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: var(--c-bg);
  border-left: 3px solid var(--c-text-dim);
  font-weight: 600;
  min-width: 0;
}

.page-about .evo-panel li span {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  color: var(--c-text-dim);
}

.page-about .evo-panel--new li.evo-new {
  border-left-color: var(--c-accent-2);
}

.page-about .evo-panel--new li.evo-new span {
  color: var(--c-accent-2);
}

.page-about .evo-panel--new li.evo-new::after {
  content: "新";
  margin-left: auto;
  background: var(--c-accent-2);
  color: var(--c-bg);
  font-family: var(--f-mono);
  font-size: 0.625rem;
  font-weight: 700;
  padding: 2px 6px;
  flex: 0 0 auto;
}

.page-about .evo-divider {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 8px 0;
  font-family: var(--f-mono);
}

.page-about .evo-divider__arrow {
  font-size: 1.5rem;
  color: var(--c-accent);
  transform: rotate(90deg);
  display: inline-block;
  transition: transform var(--tr);
}

.page-about .evo-divider__label {
  font-style: normal;
  color: var(--c-text-dim);
  font-size: 0.75rem;
  white-space: nowrap;
}

/* ---------- 七类分类卡片 ---------- */
.page-about .classes-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .review-class-card {
  background: var(--c-card);
  border: 1px solid var(--c-line);
  padding: 24px 20px;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
  transition: border-color var(--tr), background var(--tr);
}

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

.page-about .review-class-card__num {
  font-family: var(--f-mono);
  color: var(--c-accent);
  font-size: 0.875rem;
  font-weight: 700;
}

.page-about .review-class-card h3 {
  font-family: var(--f-headline);
  font-size: 1.25rem;
  font-style: italic;
  margin: 0;
}

.page-about .review-class-card p {
  color: var(--c-text-dim);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin: 0;
}

.page-about .review-class-card--new {
  border-color: rgba(255, 122, 26, 0.4);
  background: linear-gradient(135deg, rgba(255, 122, 26, 0.06), var(--c-card) 55%);
}

.page-about .review-class-card--new:hover {
  border-color: var(--c-accent-2);
}

.page-about .classes-cta {
  margin-top: 32px;
  text-align: center;
}

/* ---------- 章节 04：队伍与质量管理 ---------- */
.page-about .team-map {
  display: grid;
  gap: 16px;
  margin-bottom: 36px;
}

.page-about .team-map__section {
  border: 1px solid var(--c-line);
  background: var(--c-card);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.page-about .team-map__index {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  color: var(--c-accent);
  font-weight: 800;
}

.page-about .team-map__section h3 {
  font-family: var(--f-headline);
  font-size: 1.25rem;
  font-style: italic;
  margin: 0;
}

.page-about .team-map__section p {
  color: var(--c-text-dim);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin: 0;
}

.page-about .team-map__section--core {
  border-color: var(--c-accent);
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.08), var(--c-card) 60%);
  box-shadow: var(--c-glow);
}

.page-about .team-figure {
  margin: 0 0 40px;
  border: 1px solid var(--c-line);
  padding: 8px;
  background: var(--c-card);
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.page-about .team-figure img {
  display: block;
  width: 100%;
}

.page-about .quality-block {
  display: grid;
  gap: 32px;
  background: var(--c-card);
  border: 1px solid var(--c-line);
  padding: 32px 24px;
}

.page-about .quality-block__text h3 {
  font-family: var(--f-headline);
  font-size: 1.5rem;
  font-style: italic;
  margin: 0 0 12px;
}

.page-about .quality-block__text p {
  color: var(--c-text-dim);
  line-height: 1.8;
  font-size: 0.9375rem;
  margin: 0;
}

.page-about .quality-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.page-about .quality-stat {
  border: 1px solid var(--c-line);
  background: var(--c-bg);
  padding: 16px 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-align: center;
  min-width: 0;
}

.page-about .quality-stat__value {
  font-family: var(--f-mono);
  font-size: clamp(1.25rem, 3vw, 1.9rem);
  font-weight: 800;
  color: var(--c-data);
  line-height: 1.1;
}

.page-about .quality-stat__label {
  color: var(--c-text-dim);
  font-size: 0.75rem;
  line-height: 1.5;
}

.page-about .quality-figure {
  margin: 40px 0 0;
  border: 1px solid var(--c-line);
  padding: 8px;
  background: var(--c-card);
  max-width: 960px;
}

.page-about .quality-figure img {
  display: block;
  width: 100%;
}

.page-about .media-caption {
  display: block;
  padding-top: 8px;
  color: var(--c-text-dim);
}

/* ---------- 章节 05：继续探索 ---------- */
.page-about .about-next {
  padding-bottom: 80px;
}

.page-about .about-next__grid {
  display: grid;
  gap: 12px;
}

.page-about .next-card {
  display: block;
  border: 1px solid var(--c-line);
  background: var(--c-card);
  padding: 24px 20px;
  color: var(--c-text);
  text-decoration: none;
  min-width: 0;
  transition: border-color var(--tr), background var(--tr), transform var(--tr);
}

.page-about .next-card:hover {
  border-color: var(--c-accent);
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.05), var(--c-card) 60%);
  transform: translateY(-2px);
}

.page-about .next-card__tag {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  color: var(--c-accent);
  display: inline-block;
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.page-about .next-card h3 {
  font-family: var(--f-headline);
  font-size: 1.125rem;
  font-style: italic;
  margin: 0 0 8px;
}

.page-about .next-card p {
  color: var(--c-text-dim);
  font-size: 0.875rem;
  line-height: 1.6;
  margin: 0;
}

/* ==========================================================
   媒体查询：平板 / 桌面
   ========================================================== */
@media (min-width: 768px) {
  /* 页头 */
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    align-items: end;
    gap: 48px;
  }

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

  .page-about .about-hero__facts .hero-fact:first-child {
    grid-column: span 2;
  }

  /* 品牌关系 */
  .page-about .brand-relation__grid {
    grid-template-columns: 1fr 0.9fr;
    align-items: center;
    gap: 48px;
  }

  .page-about .rel-diagram {
    flex-direction: row;
    align-items: flex-start;
    gap: 0;
  }

  .page-about .rel-diagram__node {
    flex: 1;
  }

  .page-about .rel-diagram__arrow {
    width: 48px;
    padding: 40px 0 0;
  }

  .page-about .rel-diagram__arrow span {
    transform: none;
  }

  /* 时间线 */
  .page-about .milestone-item {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: 24px;
    padding-left: 48px;
  }

  .page-about .milestone-item__year {
    text-align: right;
    margin-bottom: 0;
  }

  .page-about .milestone-item__year::after {
    display: none;
  }

  /* 七类对比 */
  .page-about .classes-evolution {
    grid-template-columns: 1fr auto 1fr;
    align-items: start;
    gap: 20px;
  }

  .page-about .evo-divider {
    padding-top: 56px;
  }

  .page-about .evo-divider__arrow {
    transform: none;
  }

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

  /* 团队 */
  .page-about .team-map {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .quality-block {
    grid-template-columns: 3fr 2fr;
    align-items: center;
  }

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

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

  .page-about .classes-grid .review-class-card:nth-child(7) {
    grid-column: span 2;
  }

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

  .page-about .milestone-figure {
    max-width: 1100px;
    margin-left: auto;
    margin-right: auto;
  }
}