/* ===== 页面专属 CSS：.page-about ===== */
.page-about {
  --pg-clr-breadcrumb: #64B5F6;
  --pg-clr-section-bg: #F5F7FA;
  --pg-clr-section-dark: #0A192F;
  --pg-clr-accent-line: #FFD700;
  --pg-clr-border-light: rgba(26,58,107,0.12);
  --pg-clr-text-on-dark: #F5F7FA;
  --pg-clr-tl-dot: #2196F3;
  --pg-clr-tl-dot-current: #FFD700;
  --pg-clr-step-bg: rgba(33,150,243,0.08);
  --pg-clr-step-border: #2196F3;
  --pg-clr-card-path-shadow: 0 4px 0 rgba(255,215,0,0.15), 0 8px 24px rgba(10,25,47,0.08);
  --pg-gap-grid: 2rem;
  --pg-radius-card: 12px;
  --pg-radius-tag: 4px;
  --pg-fs-quote: 1.15rem;
  --pg-lh-quote: 1.7;
}

/* --- 面包屑 --- */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem 0.6rem;
  padding: 1rem var(--container-pad) 0;
  max-width: var(--container-max);
  margin: 0 auto;
  font-size: 0.85rem;
}
.page-about .breadcrumb__link {
  color: var(--pg-clr-breadcrumb);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--duration-m);
}
.page-about .breadcrumb__link:hover {
  color: var(--clr-accent);
  text-decoration: underline;
}
.page-about .breadcrumb__sep {
  color: var(--clr-primary-300);
  font-weight: 700;
  user-select: none;
}
.page-about .breadcrumb__item--current {
  color: var(--clr-primary-700);
  font-weight: 600;
}

/* --- 首屏分屏 --- */
.page-about__hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--pg-gap-grid);
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 2rem var(--container-pad) 1rem;
  align-items: center;
}
.page-about__headline {
  font-size: var(--fs-heading-lg);
  font-weight: var(--fw-heading);
  color: var(--clr-primary-900);
  margin: 0 0 0.75rem;
  line-height: 1.15;
  letter-spacing: -0.02em;
}
.page-about__subtitle {
  font-size: calc(var(--fs-body) * 1.1);
  line-height: var(--lh-body);
  color: var(--clr-primary-700);
  margin: 0 0 1.5rem;
  max-width: 48ch;
}
.page-about__statements {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.page-about__stat.card--stat {
  background: var(--clr-neutral-100);
  border-left: 4px solid var(--clr-accent);
  padding: 1rem 1.25rem;
  box-shadow: var(--shadow-card);
}
.page-about__stat .card__body {
  margin: 0.5rem 0 0;
  font-size: var(--fs-body);
  color: var(--clr-primary-900);
}
.page-about .tag--accent {
  background: var(--clr-accent);
  color: var(--clr-primary-900);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.2rem 0.6rem;
  border-radius: var(--pg-radius-tag);
  font-weight: 700;
  display: inline-block;
}
.page-about__hero-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--pg-radius-card);
  box-shadow: 0 4px 20px rgba(10,25,47,0.1);
  display: block;
}
.svg-placeholder--hero {
  margin-top: 1rem;
  border-radius: var(--pg-radius-card);
  background: rgba(245,247,250,0.6);
  padding: 1rem;
}
.page-about__svg-deco {
  width: 100%;
  height: auto;
  display: block;
}

/* --- 品牌起源 --- */
.page-about__origin {
  background: var(--pg-clr-section-bg);
  padding: 3rem var(--container-pad);
}
.page-about__origin-inner {
  max-width: var(--container-max);
  margin: 0 auto;
}
.section__heading {
  font-size: var(--fs-heading-md);
  font-weight: var(--fw-heading);
  color: var(--clr-primary-900);
  margin: 0 0 1.5rem;
  position: relative;
  padding-bottom: 0.6rem;
}
.section__heading::after {
  content: '';
  display: block;
  width: 48px;
  height: 3px;
  background: var(--clr-accent);
  margin-top: 0.5rem;
}
.page-about__origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
.page-about__origin-p {
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--clr-primary-700);
  margin: 0 0 1rem;
}
.page-about__quote {
  margin: 1.5rem 0 0;
  padding: 1rem 1.25rem;
  border-left: 4px solid var(--clr-accent);
  background: rgba(255,215,0,0.06);
  border-radius: 0 var(--pg-radius-card) var(--pg-radius-card) 0;
}
.page-about__quote .tag--gold {
  background: var(--clr-accent);
  color: var(--clr-primary-900);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: var(--pg-radius-tag);
  display: inline-block;
  margin-bottom: 0.5rem;
}
.page-about__quote p {
  font-size: var(--pg-fs-quote);
  line-height: var(--pg-lh-quote);
  color: var(--clr-primary-900);
  font-style: italic;
  margin: 0;
}
.svg-placeholder--timeline {
  background: rgba(255,255,255,0.5);
  border-radius: var(--pg-radius-card);
  padding: 0.5rem;
}
.page-about__svg-timeline {
  width: 100%;
  height: auto;
  display: block;
}

/* --- 用户路径 --- */
.section--dark {
  background: var(--pg-clr-section-dark);
  padding: 3rem var(--container-pad);
}
.section__heading--light {
  color: var(--pg-clr-text-on-dark);
}
.section__heading--light::after {
  background: var(--clr-accent);
}
.page-about__paths-inner {
  max-width: var(--container-max);
  margin: 0 auto;
}
.page-about__paths-intro {
  font-size: calc(var(--fs-body) * 1.05);
  line-height: var(--lh-body);
  color: var(--clr-primary-300);
  margin: -0.5rem 0 2rem;
  max-width: 50ch;
}
.page-about__paths-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}
.card--path {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--pg-radius-card);
  padding: 1.5rem 1.25rem;
  box-shadow: var(--pg-clr-card-path-shadow);
  transition: transform var(--duration-m), box-shadow var(--duration-m);
  cursor: default;
}
.card--path:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 0 rgba(255,215,0,0.2), 0 16px 32px rgba(10,25,47,0.2);
}
.card__accent-line {
  width: 48px;
  height: 3px;
  border-radius: 2px;
  margin-bottom: 0.75rem;
}
.card__accent-line--blue {
  background: var(--clr-primary-500);
}
.card__accent-line--gold {
  background: var(--clr-accent);
}
.card--path .tag--blue {
  background: var(--clr-primary-500);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: var(--pg-radius-tag);
  display: inline-block;
  margin-bottom: 0.5rem;
}
.card--path .tag--gold {
  background: var(--clr-accent);
  color: var(--clr-primary-900);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: var(--pg-radius-tag);
  display: inline-block;
  margin-bottom: 0.5rem;
}
.card__title--path {
  font-size: calc(var(--fs-body) * 1.3);
  font-weight: 700;
  color: var(--pg-clr-text-on-dark);
  margin: 0 0 0.5rem;
}
.card--path .card__body {
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--clr-primary-300);
  margin: 0 0 1rem;
}
.page-about__path-steps {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.page-about__step {
  display: inline-block;
  background: var(--pg-clr-step-bg);
  border: 1px solid var(--pg-clr-step-border);
  border-radius: 20px;
  padding: 0.2rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--clr-primary-300);
}
.page-about__path-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1.5rem;
}
.page-about__paths-img {
  width: 100%;
  max-width: 200px;
  height: auto;
  border-radius: var(--pg-radius-card);
  display: block;
}
.svg-placeholder--flow {
  width: 100%;
  max-width: 220px;
}
.page-about__svg-flow {
  width: 100%;
  height: auto;
  display: block;
}

/* --- 海南基地 --- */
.page-about__base {
  background: var(--pg-clr-section-bg);
  padding: 3rem var(--container-pad);
}
.page-about__base-inner {
  max-width: var(--container-max);
  margin: 0 auto;
}
.page-about__base-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
.page-about__base-p {
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--clr-primary-700);
  margin: 0 0 1rem;
}
.page-about__base-trust {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}
.tag--outline {
  border: 1px solid var(--clr-primary-500);
  color: var(--clr-primary-500);
  background: transparent;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.7rem;
  border-radius: var(--pg-radius-tag);
  display: inline-block;
}
.page-about__base-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--pg-radius-card);
  box-shadow: 0 4px 16px rgba(10,25,47,0.08);
  display: block;
}
.svg-placeholder--base {
  margin-top: 1rem;
  background: rgba(255,255,255,0.6);
  border-radius: var(--pg-radius-card);
  padding: 0.5rem;
}
.page-about__svg-base {
  width: 100%;
  height: auto;
  display: block;
}

/* --- 时间线 --- */
.section--timeline {
  background: #fff;
  padding: 3rem var(--container-pad);
}
.page-about__timeline-inner {
  max-width: var(--container-max);
  margin: 0 auto;
}
.page-about__timeline-track {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  position: relative;
  padding-left: 1.5rem;
  border-left: 2px solid var(--clr-primary-300);
}
.page-about__tl-node {
  position: relative;
  transition: opacity var(--duration-m);
}
.page-about__tl-marker {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  user-select: none;
  padding: 0.3rem 0;
  transition: color var(--duration-m);
}
.page-about__tl-marker:hover {
  color: var(--clr-accent);
}
.page-about__tl-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--pg-clr-tl-dot);
  border: 2px solid #fff;
  box-shadow: 0 0 0 2px var(--pg-clr-tl-dot);
  flex-shrink: 0;
  transition: background var(--duration-m), box-shadow var(--duration-m);
  position: absolute;
  left: -1.85rem;
  top: 0.5rem;
}
.page-about__tl-dot--current {
  background: var(--pg-clr-tl-dot-current);
  box-shadow: 0 0 0 2px var(--pg-clr-tl-dot-current);
}
.page-about__tl-label {
  font-weight: 700;
  font-size: calc(var(--fs-body) * 1.1);
  color: var(--clr-primary-900);
}
.page-about__tl-node[data-open="true"] .page-about__tl-label {
  color: var(--clr-primary-500);
}
.page-about__tl-content {
  margin-left: 2.25rem;
  padding: 0.5rem 0 0.25rem;
  transition: all var(--duration-l);
}
.page-about__tl-content[hidden] {
  display: none;
}
.page-about__tl-node[data-open="true"] .page-about__tl-content {
  display: block;
}
.page-about__tl-text {
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--clr-primary-700);
  margin: 0;
  max-width: 48ch;
}

/* --- 相关链接 --- */
.page-about__related {
  background: var(--pg-clr-section-bg);
  padding: 2.5rem var(--container-pad);
}
.page-about__related-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  text-align: center;
}
.section__heading--sm {
  font-size: calc(var(--fs-heading-md) * 0.8);
  margin-bottom: 1.25rem;
}
.page-about__related-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}
.btn--related {
  min-width: 140px;
  text-decoration: none;
  text-align: center;
}
.btn--outline {
  display: inline-block;
  padding: 0.6rem 1.5rem;
  border: 2px solid var(--clr-primary-500);
  border-radius: 6px;
  font-weight: 700;
  font-size: var(--fs-body);
  color: var(--clr-primary-500);
  background: transparent;
  transition: background var(--duration-m), color var(--duration-m), border-color var(--duration-m);
  cursor: pointer;
}
.btn--outline:hover {
  background: var(--clr-primary-500);
  color: #fff;
  border-color: var(--clr-primary-500);
}

/* ===== 响应式：窄屏保障 ===== */
@media (max-width: 599px) {
  .page-about {
    overflow-x: hidden;
  }
  .page-about__hero-img,
  .page-about__paths-img,
  .page-about__base-img {
    max-width: 100%;
    height: auto;
  }
  .page-about__headline {
    font-size: clamp(1.8rem, 8vw, 2.4rem);
  }
  .page-about__statements {
    flex-direction: column;
  }
  .page-about__paths-grid {
    grid-template-columns: 1fr;
  }
  .page-about__timeline-track {
    padding-left: 1.25rem;
  }
  .page-about__tl-dot {
    width: 12px;
    height: 12px;
    left: -1.55rem;
  }
  .page-about__tl-content {
    margin-left: 0.5rem;
  }
  .page-about__related-links {
    flex-direction: column;
    align-items: center;
  }
  .btn--related {
    width: 100%;
    max-width: 280px;
  }
}

/* ===== 桌面端 ===== */
@media (min-width: 768px) {
  .page-about__hero {
    grid-template-columns: 1.1fr 0.9fr;
    padding: 3rem var(--container-pad) 2rem;
  }
  .page-about__statements {
    flex-direction: row;
    gap: 1.25rem;
  }
  .page-about__stat.card--stat {
    flex: 1;
  }
  .page-about__origin-grid {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: start;
  }
  .page-about__paths-grid {
    grid-template-columns: 1fr 1fr;
  }
  .page-about__path-visual {
    flex-direction: row;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 2rem;
  }
  .page-about__base-grid {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: start;
  }
  .page-about__timeline-track {
    padding-left: 2.5rem;
  }
  .page-about__tl-dot {
    left: -2.2rem;
    top: 0.4rem;
  }
  .page-about__tl-content {
    margin-left: 0.75rem;
  }
  .section__heading {
    font-size: var(--fs-heading-md);
  }
}

@media (min-width: 1024px) {
  .page-about__hero {
    gap: 3rem;
  }
  .page-about__headline {
    font-size: 3rem;
  }
  .page-about__origin-grid {
    gap: 3rem;
  }
  .page-about__base-grid {
    gap: 3rem;
  }
}