/* ============================================================
   页面专属样式：.page-about（品牌故事）
   ============================================================ */
.page-about {
  --about-line: rgba(74, 106, 143, 0.3);
  --about-soft: rgba(245, 247, 250, 0.045);
  --about-panel: rgba(18, 24, 31, 0.55);
  background: var(--color-deep);
  color: var(--color-cloud);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  padding-top: var(--sp-4);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--color-blue-gray);
}

.page-about .breadcrumb a {
  color: var(--color-green);
  text-decoration: none;
  transition: color var(--t-fast);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus {
  color: var(--color-orange);
}

.page-about .breadcrumb-sep {
  margin: 0 6px;
  color: var(--color-blue-gray);
}

.page-about .breadcrumb-current {
  color: var(--color-cloud);
}

/* 目录 */
.page-about .about-toc-col {
  margin-top: var(--sp-1);
}

.page-about .about-toc {
  padding: var(--sp-2);
  background: var(--about-soft);
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--color-orange);
  border-radius: var(--radius);
}

.page-about .about-toc-label {
  margin: 0 0 var(--sp-1);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-green);
}

.page-about .about-toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: nowrap;
  gap: var(--sp-1);
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc-list li {
  flex: 0 0 auto;
}

.page-about .about-toc-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 5px 10px;
  border: 1px solid var(--about-line);
  border-radius: 20px;
  color: rgba(245, 247, 250, 0.8);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast);
}

.page-about .about-toc-list a:hover,
.page-about .about-toc-list a:focus {
  color: var(--color-orange);
  border-color: var(--color-orange);
}

.page-about .about-toc-list .toc-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-blue-gray);
}

/* 内容列 */
.page-about .about-content-col {
  min-width: 0;
}

/* Hero */
.page-about .about-hero {
  position: relative;
  padding: var(--sp-5) 0 var(--sp-4);
  margin-bottom: var(--sp-2);
  border-bottom: 1px solid var(--about-line);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.03), transparent 60%);
}

.page-about .about-hero-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-4);
  align-items: center;
}

.page-about .about-hero-eyebrow {
  margin-bottom: var(--sp-2);
}

.page-about .about-h1-accent {
  color: var(--color-orange);
}

.page-about .about-hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 6vw, 3.6rem);
  font-weight: 900;
  line-height: 1.1;
  margin: 0 0 var(--sp-2);
  letter-spacing: 0.02em;
}

.page-about .about-hero-desc {
  font-size: 16px;
  line-height: 1.8;
  color: rgba(245, 247, 250, 0.82);
  margin: 0 0 var(--sp-3);
  max-width: 62ch;
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-2);
}

.page-about .about-hero-stats .stat-block {
  background: var(--about-soft);
  border-left: 3px solid var(--color-orange);
  padding: var(--sp-2);
}

.page-about .about-hero-stats .stat-value {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--color-cloud);
  display: block;
}

.page-about .about-hero-stats .stat-label {
  font-size: 12px;
  color: var(--color-green-soft);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.page-about .about-hero-visual {
  position: relative;
  transform: rotate(1.5deg);
  transition: transform var(--t-slow);
}

.page-about .about-hero-visual::before {
  content: "";
  position: absolute;
  top: 14px;
  right: -14px;
  width: 100%;
  height: 100%;
  background: var(--gradient-fire);
  opacity: 0.14;
  clip-path: polygon(6% 0, 100% 0, 94% 100%, 0 100%);
  border-radius: var(--radius-lg);
}

.page-about .about-hero-svg {
  display: block;
  width: 100%;
  height: auto;
  background: rgba(18, 24, 31, 0.6);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-lg);
}

.page-about .about-hero-track {
  stroke-dasharray: 900;
  stroke-dashoffset: 900;
  animation: aboutDash 1.8s var(--ease) forwards;
}

@keyframes aboutDash {
  to {
    stroke-dashoffset: 0;
  }
}

/* 章节通用 */
.page-about .about-section {
  padding: var(--sp-4) 0;
  border-top: 1px solid var(--about-line);
  scroll-margin-top: 120px;
}

.page-about .about-section:first-of-type {
  border-top: 0;
}

.page-about .about-section:target .about-section-head {
  border-left-color: var(--color-green);
}

.page-about .about-section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--sp-2);
  margin-bottom: var(--sp-3);
  border-left: 4px solid var(--color-orange);
  padding-left: var(--sp-2);
  transition: border-color var(--t-fast);
}

.page-about .about-section-no {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-green);
  letter-spacing: 0.12em;
}

.page-about .about-section-head h2 {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 900;
  margin: 0;
  color: var(--color-cloud);
}

.page-about .about-section-head .about-section-lead {
  flex-basis: 100%;
  margin: 0;
  color: var(--color-blue-gray);
  font-size: 14px;
  line-height: 1.6;
  letter-spacing: 0.02em;
}

/* 品牌起源 */
.page-about .about-story-content {
  display: grid;
  gap: var(--sp-3);
}

.page-about .about-story-para {
  font-size: 15px;
  line-height: 1.9;
  color: rgba(245, 247, 250, 0.8);
  margin: 0 0 var(--sp-2);
}

.page-about .about-story-para:last-child {
  margin-bottom: 0;
}

.page-about .about-story-figure,
.page-about .about-org-figure,
.page-about .about-tech-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--about-soft);
  border: 1px solid var(--about-line);
}

.page-about figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.page-about .about-story-img {
  border-radius: var(--radius-lg);
}

.page-about figcaption {
  padding: var(--sp-1) var(--sp-2);
  font-size: 12px;
  color: var(--color-blue-gray);
  line-height: 1.6;
}

/* 价值观 */
.page-about .about-values {
  list-style: none;
  margin: var(--sp-3) 0 0;
  padding: 0;
  display: grid;
  gap: var(--sp-2);
}

.page-about .about-value-item {
  background: var(--about-soft);
  padding: var(--sp-2);
  border-top: 2px solid transparent;
  transition: border-color var(--t-fast), transform var(--t-med);
}

.page-about .about-value-item:hover {
  border-top-color: var(--color-green);
  transform: translateY(-2px);
}

.page-about .about-value-no {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-orange);
  display: block;
  margin-bottom: 4px;
}

.page-about .about-value-item h3 {
  font-size: 15px;
  margin: 0 0 4px;
  color: var(--color-cloud);
}

.page-about .about-value-item p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(245, 247, 250, 0.72);
}

/* 时间线 */
.page-about .about-timeline-scroll-hint {
  margin: 0 0 var(--sp-1);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-blue-gray);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  text-align: right;
}

.page-about .about-timeline {
  display: flex;
  gap: var(--sp-3);
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  list-style: none;
  margin: 0 calc(var(--container-pad) * -1);
  padding: var(--sp-3) var(--container-pad) var(--sp-4);
  scroll-snap-type: x proximity;
}

.page-about .about-timeline-item {
  position: relative;
  flex: 0 0 260px;
  padding: var(--sp-4) var(--sp-2) var(--sp-2);
  background: var(--about-panel);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-lg);
  scroll-snap-align: start;
  transition: transform var(--t-med), border-color var(--t-fast);
}

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-fire);
  transform: scaleX(0.3);
  transform-origin: left;
  transition: transform var(--t-med);
}

.page-about .about-timeline-item:hover,
.page-about .about-timeline-item:focus-within {
  border-color: var(--color-orange);
}

.page-about .about-timeline-item:hover::before,
.page-about .about-timeline-item:focus-within::before {
  transform: scaleX(1);
}

.page-about .about-timeline-marker {
  position: absolute;
  top: -10px;
  left: var(--sp-2);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-deep);
  background: var(--color-green);
  padding: 2px 8px;
  border-radius: 12px;
  letter-spacing: 0.04em;
}

.page-about .about-timeline-card h3 {
  margin: 0 0 6px;
  font-size: 15px;
  color: var(--color-cloud);
}

.page-about .about-timeline-card p {
  margin: 0 0 var(--sp-1);
  font-size: 13px;
  line-height: 1.7;
  color: rgba(245, 247, 250, 0.72);
}

.page-about .about-timeline-card .tag {
  opacity: 0.6;
  transition: opacity var(--t-fast);
}

.page-about .about-timeline-item:hover .tag,
.page-about .about-timeline-item:focus-within .tag {
  opacity: 1;
}

/* 团队与组织 */
.page-about .about-org-grid {
  display: grid;
  gap: var(--sp-3);
}

.page-about .about-org-text p {
  font-size: 14px;
  line-height: 1.9;
  margin: 0 0 var(--sp-2);
  color: rgba(245, 247, 250, 0.8);
}

.page-about .about-org-text p:last-of-type {
  margin-bottom: 0;
}

.page-about .about-org-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-1);
  margin-top: var(--sp-2);
}

.page-about .about-org-metrics .stat-block {
  background: var(--about-soft);
  padding: var(--sp-1);
  border-top: 2px solid var(--color-orange);
}

.page-about .about-org-metrics .stat-value {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  display: block;
}

.page-about .about-org-metrics .stat-label {
  font-size: 11px;
  color: var(--color-green-soft);
  letter-spacing: 0.06em;
}

/* 技术与数据 */
.page-about .about-tech-features {
  display: grid;
  gap: var(--sp-2);
}

.page-about .about-tech-feature {
  position: relative;
  padding: var(--sp-2) var(--sp-2) var(--sp-2) var(--sp-3);
  background: var(--about-soft);
  border-radius: var(--radius);
  overflow: hidden;
  transition: background var(--t-fast);
}

.page-about .about-tech-feature:hover {
  background: rgba(245, 247, 250, 0.07);
}

.page-about .about-tech-feature::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 3px;
  background: var(--color-green);
  opacity: 0.6;
}

.page-about .about-tech-index {
  font-family: var(--font-mono);
  color: var(--color-orange);
  font-size: 12px;
  letter-spacing: 0.12em;
}

.page-about .about-tech-feature h3 {
  font-size: 15px;
  color: var(--color-cloud);
  margin: 4px 0 4px;
}

.page-about .about-tech-feature p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(245, 247, 250, 0.74);
}

.page-about .about-tech-figure {
  margin-top: var(--sp-3);
}

/* 合作与生态 */
.page-about .about-eco-grid {
  display: grid;
  gap: var(--sp-2);
}

.page-about .about-eco-card {
  background: var(--about-soft);
  border-left: 3px solid var(--color-blue-gray);
  padding: var(--sp-2);
  transition: border-color var(--t-fast), transform var(--t-med);
}

.page-about .about-eco-card:hover {
  border-color: var(--color-green);
  transform: translateX(4px);
}

.page-about .about-eco-card:nth-child(2) {
  border-left-color: var(--color-orange);
}

.page-about .about-eco-card:nth-child(3) {
  border-left-color: var(--color-green);
}

.page-about .about-eco-card h3 {
  font-size: 15px;
  margin: 0 0 6px;
  color: var(--color-cloud);
}

.page-about .about-eco-card p {
  font-size: 13px;
  line-height: 1.8;
  margin: 0;
  color: rgba(245, 247, 250, 0.74);
}

.page-about .about-eco-footer {
  margin-top: var(--sp-3);
  padding: var(--sp-2);
  border-top: 1px solid var(--about-line);
  font-size: 13px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--sp-1);
}

.page-about .about-eco-footer p {
  margin: 0;
}

.page-about .about-eco-footer a {
  color: var(--color-green);
  text-decoration: none;
  transition: color var(--t-fast);
}

.page-about .about-eco-footer a:hover,
.page-about .about-eco-footer a:focus {
  color: var(--color-orange);
}

/* ======= 桌面端布局 ======= */
@media (min-width: 1024px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr);
    gap: var(--sp-5);
    align-items: start;
    padding-bottom: var(--sp-6);
  }

  .page-about .about-toc-col {
    position: sticky;
    top: 110px;
    margin-top: 0;
  }

  .page-about .about-toc {
    padding: var(--sp-3);
    border-left: 3px solid var(--color-orange);
  }

  .page-about .about-toc-list {
    display: block;
    overflow: visible;
    margin: 0;
  }

  .page-about .about-toc-list li {
    border-top: 1px solid var(--about-line);
  }

  .page-about .about-toc-list a {
    display: flex;
    align-items: baseline;
    gap: var(--sp-1);
    padding: 10px 4px;
    border: 0;
    border-radius: 0;
    color: rgba(245, 247, 250, 0.75);
    font-size: 14px;
    white-space: normal;
  }

  .page-about .about-toc-list a:hover,
  .page-about .about-toc-list a:focus {
    color: var(--color-orange);
    border-color: transparent;
    padding-left: 8px;
  }

  .page-about .about-toc-list .toc-num {
    color: var(--color-blue-gray);
  }

  .page-about .about-content-col {
    max-width: 820px;
  }

  .page-about .about-hero-inner {
    grid-template-columns: 1.25fr 0.75fr;
    gap: var(--sp-5);
  }

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

  .page-about .about-story-content {
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-4);
    align-items: start;
  }

  .page-about .about-section {
    padding: var(--sp-5) 0;
  }

  .page-about .about-timeline-scroll-hint {
    display: none;
  }

  .page-about .about-timeline {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--sp-2);
    margin: 0;
    padding: var(--sp-3) 0 var(--sp-4);
    overflow: visible;
  }

  .page-about .about-timeline-item {
    flex: initial;
  }

  .page-about .about-timeline-item:nth-child(even) {
    transform: translateY(14px);
  }

  .page-about .about-timeline-item:nth-child(even):hover,
  .page-about .about-timeline-item:nth-child(even):focus-within {
    transform: translateY(10px);
  }

  .page-about .about-org-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-4);
    align-items: center;
  }

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

  .page-about .about-eco-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--sp-2);
  }
}