/* ===== 品牌故事页专属样式 ===== */
.page-about {
  --about-accent: var(--color-accent);
  --about-accent-alt: var(--color-accent-alt);
  --about-burgundy: var(--color-burgundy);
  --about-teal: var(--color-deep-teal);
  --about-indigo: var(--color-indigo);
  --about-bg: var(--color-bg);
  --about-text: var(--color-text);
  --about-muted: var(--color-text-muted);
  --about-line: var(--color-line);
  --about-node-size: 2.5rem;
  --about-gap: clamp(1.25rem, 3vw, 2.5rem);

  background: var(--about-bg);
  color: var(--about-text);
  overflow-x: hidden;
}

/* 面包屑 */
.page-about .page-about__crumb {
  padding-top: 1.5rem;
  padding-bottom: 0.5rem;
}

.page-about .page-about__crumb .breadcrumb {
  font-size: 0.85rem;
}

/* Hero 区 */
.page-about .about-hero {
  position: relative;
  padding: 2rem 0 3rem;
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  align-items: center;
}

.page-about .about-hero-copy .section-label {
  margin-bottom: 0.75rem;
}

.page-about .about-hero-copy h1 {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: clamp(1.65rem, 4vw, 2.5rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.page-about .about-hero-lead {
  color: var(--about-muted);
  font-size: 1.05rem;
  line-height: 1.75;
  max-width: 36em;
  margin-bottom: 1.5rem;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .about-hero-visual {
  position: relative;
}

.page-about .about-hero-visual .media-frame {
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .about-hero-deco {
  position: absolute;
  top: 20%;
  left: -3rem;
  width: 220px;
  height: 160px;
  opacity: 0.3;
  pointer-events: none;
  z-index: 0;
}

/* 全局数据概览 */
.page-about .about-overview {
  padding: 2rem 0;
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-overview-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem 1rem;
}

.page-about .about-overview-grid .stat-item {
  text-align: center;
  padding: 0.5rem 0;
}

.page-about .about-overview-grid .stat-value {
  font-family: var(--font-data);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  color: var(--about-accent);
  display: block;
  line-height: 1.1;
}

.page-about .about-overview-grid .stat-key {
  color: var(--about-muted);
  font-size: 0.85rem;
  margin-top: 0.25rem;
  display: block;
}

/* 时间轴 */
.page-about .about-timeline {
  padding: 3rem 0;
}

.page-about .about-timeline-inner {
  position: relative;
}

.page-about .about-timeline-item {
  position: relative;
  padding: 2.5rem 0;
  padding-left: calc(var(--about-node-size) + 0.75rem);
}

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: calc(var(--about-node-size) / 2);
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--about-line);
}

.page-about .about-timeline-node {
  position: absolute;
  left: 0;
  top: 2.5rem;
  width: var(--about-node-size);
  height: var(--about-node-size);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--about-accent);
  color: var(--about-bg);
  font-family: var(--font-data);
  font-size: 0.8rem;
  font-weight: 700;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  z-index: 1;
}

.page-about .about-timeline-side {
  margin-bottom: 1rem;
}

.page-about .about-timeline-side .section-title {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: clamp(1.3rem, 2.5vw, 1.75rem);
  letter-spacing: -0.02em;
  margin: 0.5rem 0 0.25rem;
}

.page-about .about-timeline-side .section-intro {
  color: var(--about-muted);
  font-size: 0.9rem;
  margin: 0;
}

.page-about .about-timeline-main {
  display: grid;
  gap: 1rem;
}

.page-about .about-timeline-main .panel {
  padding: 1.5rem;
  border: 1px solid var(--about-line);
  background: rgba(244, 247, 251, 0.04);
}

.page-about .about-timeline-main .panel h3 {
  font-size: 1rem;
  margin: 0 0 0.4rem;
}

.page-about .about-timeline-main .panel h3 + p {
  margin-bottom: 1rem;
}

.page-about .about-milestone-stats {
  margin-top: 1rem;
  border-top: 1px dashed var(--about-line);
  padding-top: 1rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.page-about .about-milestone-stats .stat-value {
  font-family: var(--font-data);
  font-size: 1.35rem;
  color: var(--about-accent);
}

.page-about .about-milestone-stats .stat-key {
  font-size: 0.8rem;
  color: var(--about-muted);
}

/* details 折叠区 */
.page-about .about-details {
  border: 1px solid var(--about-line);
  background: rgba(14, 76, 90, 0.2);
  border-radius: 0;
}

.page-about .about-details summary {
  cursor: pointer;
  padding: 0.85rem 1.25rem;
  color: var(--about-accent);
  font-weight: 600;
  font-size: 0.9rem;
  list-style: none;
}

.page-about .about-details summary::before {
  content: "＋ ";
  color: var(--about-accent);
}

.page-about .about-details[open] summary::before {
  content: "－ ";
}

.page-about .about-details-body {
  padding: 0 1.25rem 1.25rem;
  color: var(--about-muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* 万博MANBETX电脑通道章节 */
.page-about .about-channel-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.page-about .about-channel-item {
  border-left: 2px solid var(--about-accent);
  padding-left: 0.9rem;
}

.page-about .about-channel-item h3 {
  font-size: 0.95rem;
  margin: 0 0 0.25rem;
}

.page-about .about-channel-item p {
  font-size: 0.88rem;
  color: var(--about-muted);
  margin: 0;
}

/* 迭代选项卡 */
.page-about .about-iter-tabs {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0;
}

.page-about .about-iter-tabs input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

.page-about .about-iter-tabs label {
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.page-about .about-iter-panel {
  display: none;
  padding: 1.5rem;
  border: 1px solid var(--about-line);
  border-top: 2px solid var(--about-accent);
  background: rgba(244, 247, 251, 0.04);
  margin-top: 0.75rem;
}

.page-about .about-iter-panel h3 {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 1.05rem;
  margin: 0 0 0.5rem;
}

.page-about .about-iter-panel p {
  color: var(--about-muted);
  font-size: 0.92rem;
  line-height: 1.7;
  margin: 0;
}

.page-about .about-iter-list {
  margin: 0.75rem 0 0;
  padding-left: 1.1rem;
  color: var(--about-muted);
  font-size: 0.88rem;
  line-height: 1.8;
}

.page-about .about-iter-list li + li {
  margin-top: 0.2rem;
}

/* 选项卡切换逻辑 */
.page-about #about-iter-v1:checked ~ #iter-panel-1,
.page-about #about-iter-v2:checked ~ #iter-panel-2,
.page-about #about-iter-v3:checked ~ #iter-panel-3 {
  display: block;
}

.page-about #about-iter-v1:checked ~ label[for="about-iter-v1"],
.page-about #about-iter-v2:checked ~ label[for="about-iter-v2"] {
  background: var(--about-accent);
  color: var(--about-bg);
  border-color: var(--about-accent);
}

.page-about #about-iter-v3:checked ~ label[for="about-iter-v3"] {
  box-shadow: 0 0 0 1px var(--about-accent);
}

/* 迭代图片 */
.page-about .about-iter-image {
  margin-top: 0.25rem;
}

/* 河北章节 */
.page-about .about-hebei-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-about .about-hebei-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

/* 运营章节 */
.page-about .about-ops-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

/* 底部内链 */
.page-about .about-next {
  padding: 3rem 0;
  background: linear-gradient(135deg, var(--about-indigo) 0%, var(--about-bg) 100%);
}

.page-about .about-next .section-label {
  color: var(--about-accent);
}

.page-about .about-next .section-title {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: clamp(1.3rem, 2.5vw, 1.8rem);
  margin: 0.5rem 0 1.5rem;
}

.page-about .about-next-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

.page-about .about-next-card {
  display: block;
  padding: 1.25rem;
  border: 1px solid var(--about-line);
  background: rgba(244, 247, 251, 0.03);
  text-decoration: none;
  transition: border-color 0.2s, transform 0.2s;
}

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

.page-about .about-next-card h3 {
  font-size: 1rem;
  margin: 0.5rem 0 0.25rem;
  color: var(--about-text);
}

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

/* 桌面端适配 */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding-top: 3rem;
  }

  .page-about .about-hero-grid {
    grid-template-columns: 1.4fr 1fr;
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .about-hero-deco {
    left: -1rem;
    opacity: 0.5;
  }

  .page-about .about-overview-grid {
    grid-template-columns: repeat(5, 1fr);
  }

  .page-about .about-timeline-item {
    display: grid;
    grid-template-columns: minmax(280px, 1fr) 2fr;
    gap: 0;
    padding: 2.5rem 0;
    padding-left: 0;
  }

  .page-about .about-timeline-item::before {
    display: none;
  }

  .page-about .about-timeline-side {
    position: relative;
    padding-right: clamp(2rem, 4vw, 3.5rem);
    text-align: right;
    margin-bottom: 0;
  }

  .page-about .about-timeline-side .section-title {
    margin-top: 0.75rem;
  }

  .page-about .about-timeline-node {
    left: auto;
    right: calc(var(--about-node-size) / -2);
    top: 2.5rem;
  }

  .page-about .about-timeline-main {
    padding-left: clamp(2rem, 4vw, 3.5rem);
    border-left: 1px solid var(--about-line);
  }

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

  .page-about .about-hebei-grid {
    grid-template-columns: 1.1fr 1fr;
    align-items: start;
  }

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