/* ==========================================================================
   品牌档案 · 页面专属样式
   作用域 .page-about
   ========================================================================== */

.page-about {
  --pa-paper: var(--paper-white);
  --pa-charcoal: var(--charcoal);
  --pa-muted: var(--muted-slate);
  --pa-line: var(--line-beige);
  scroll-behavior: smooth;
  background: var(--paper-white);
  color: var(--charcoal);
  font-family: var(--font-body);
  line-height: 1.65;
}

.page-about ::selection {
  background: var(--vivid-orange);
  color: #ffffff;
}

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

/* ---------- 共用区块标题与排版 ---------- */

.page-about .pa-hero__title,
.page-about .pa-manifesto .ly-title-lg,
.page-about .pa-milestones .ly-title-lg,
.page-about .pa-team .ly-title-lg,
.page-about .pa-commitments .ly-title-lg {
  font-family: var(--font-heading);
  font-style: italic;
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.01em;
}

.page-about .pa-section-head {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2.75rem;
}

.page-about .pa-section-head__note {
  font-size: 0.875rem;
  color: var(--muted-slate);
  padding-left: 1rem;
  border-left: 2px solid var(--vivid-orange);
  line-height: 1.8;
  margin: 0;
}

/* ---------- 首屏深色区块 ---------- */

.page-about .pa-hero {
  position: relative;
  padding: 6.75rem 0 3.25rem;
  background:
    radial-gradient(circle at 78% 18%, rgba(255, 107, 53, 0.3) 0%, transparent 46%),
    linear-gradient(125deg, var(--deep-green) 0%, var(--light-green) 100%);
  color: var(--soft-white);
  overflow: hidden;
}

.page-about .pa-hero::before {
  content: "";
  position: absolute;
  right: -70px;
  top: -60px;
  width: 220px;
  height: 380px;
  background: repeating-linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.09) 0 14px,
    transparent 14px 30px
  );
  transform: skewX(-14deg);
  pointer-events: none;
}

.page-about .pa-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--vivid-orange) 0 68%, var(--golden) 68% 100%);
}

.page-about .pa-hero__grid {
  display: grid;
  gap: 2rem;
  margin-top: 2.5rem;
}

.page-about .pa-hero__mast {
  border-left: 2px solid var(--vivid-orange);
  padding-left: 1.25rem;
}

.page-about .pa-hero__volume {
  margin: 0.75rem 0 0;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--golden);
  letter-spacing: 0.1em;
}

.page-about .pa-hero__edition {
  margin: 0.25rem 0 0;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.7);
  letter-spacing: 0.2em;
}

.page-about .pa-hero__title {
  margin: 0;
  font-size: clamp(1.85rem, 5vw, 3.4rem);
  line-height: 1.06;
  overflow-wrap: break-word;
}

.page-about .pa-hero__title-deco {
  display: block;
  color: var(--golden);
}

.page-about .pa-hero__lead {
  margin: 1.25rem 0 0;
  max-width: 38em;
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.88);
}

.page-about .pa-hero__figure {
  margin: 2.5rem 0 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
}

.page-about .pa-hero__figure img {
  width: 220px;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.4);
  box-shadow: var(--shadow-lg);
}

.page-about .pa-hero__figure figcaption {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.7);
  letter-spacing: 0.08em;
}

/* ---------- 品牌宣言与目录 ---------- */

.page-about .pa-manifesto {
  padding: 4.5rem 0 5rem;
}

.page-about .pa-manifesto__layout {
  display: grid;
  gap: 2.25rem;
}

.page-about .pa-toc {
  align-self: start;
  border-top: 3px solid var(--charcoal);
  padding-top: 1rem;
  position: static;
}

.page-about .pa-toc__list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
}

.page-about .pa-toc__list li {
  border-bottom: 1px solid var(--line-beige);
}

.page-about .pa-toc__list a {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.65rem 0;
  color: var(--charcoal);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.2s ease;
}

.page-about .pa-toc__list a:hover,
.page-about .pa-toc__list a:focus-visible {
  color: var(--vivid-orange);
}

.page-about .pa-toc__num {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  color: var(--vivid-orange);
}

.page-about .pa-manifesto__body {
  min-width: 0;
}

.page-about .pa-manifesto__body .ly-title-lg {
  margin: 0.5rem 0 1.75rem;
  font-size: clamp(1.6rem, 3vw, 2.6rem);
}

.page-about .pa-manifesto__para {
  margin: 1.25rem 0 0;
  max-width: 52em;
}

.page-about .pa-manifesto__para a,
.page-about .pa-commitments__footer p a {
  color: var(--deep-green);
  text-decoration-color: var(--vivid-orange);
  text-underline-offset: 3px;
}

/* ---------- 发展里程碑 ---------- */

.page-about .pa-milestones {
  padding: 5rem 0;
}

.page-about .pa-milestones__layout {
  display: grid;
  gap: 3rem;
}

.page-about .pa-milestones__layout > * {
  min-width: 0;
}

.page-about .pa-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .pa-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: var(--line-beige);
}

.page-about .pa-timeline__item {
  position: relative;
  padding: 0 0 2.25rem 1.75rem;
}

.page-about .pa-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .pa-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.4rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--vivid-orange);
  box-shadow:
    0 0 0 3px var(--paper-white),
    0 0 0 4px var(--vivid-orange);
}

.page-about .pa-timeline__meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.page-about .pa-timeline__year {
  font-family: var(--font-heading);
  font-style: italic;
  font-size: 1.5rem;
  color: var(--deep-green);
}

.page-about .pa-timeline__content h3 {
  font-size: 1.05rem;
  margin: 0 0 0.4rem;
}

.page-about .pa-timeline__content p {
  margin: 0;
  max-width: 40em;
  color: var(--muted-slate);
  font-size: 0.925rem;
}

.page-about .pa-milestones__figure {
  margin: 0;
  align-self: start;
}

.page-about .pa-milestones__figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  border: 2px solid var(--line-beige);
}

.page-about .pa-milestones__figure figcaption {
  margin-top: 0.6rem;
  font-size: 0.75rem;
  color: var(--muted-slate);
  border-top: 1px solid var(--line-beige);
  padding-top: 0.5rem;
}

/* ---------- 数据团队与归档能力 ---------- */

.page-about .pa-team {
  background: linear-gradient(130deg, var(--deep-green) 0%, var(--light-green) 100%);
  color: var(--soft-white);
  padding: 5rem 0;
  position: relative;
  overflow: hidden;
}

.page-about .pa-team::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--vivid-orange) 0 40%, var(--golden) 40% 100%);
}

.page-about .pa-team__layout {
  display: grid;
  gap: 2.5rem;
}

.page-about .pa-team__layout > * {
  min-width: 0;
}

.page-about .pa-team__heading .ly-title-lg {
  margin: 0.5rem 0 1rem;
  font-size: clamp(1.6rem, 3vw, 2.6rem);
}

.page-about .pa-team__para {
  margin: 1rem 0 0;
  color: rgba(255, 255, 255, 0.86);
  max-width: 46em;
}

.page-about .pa-team__stats {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2rem;
}

.page-about .pa-team__stats li {
  display: flex;
  flex-direction: column;
}

.page-about .pa-team__stat-num {
  font-family: var(--font-heading);
  font-style: italic;
  font-size: 2rem;
  color: var(--vivid-orange);
  line-height: 1;
}

.page-about .pa-team__stat-label {
  margin-top: 0.4rem;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.72);
}

.page-about .pa-team__aside {
  display: grid;
  gap: 1rem;
  align-content: start;
}

.page-about .pa-team__figure {
  margin: 0;
}

.page-about .pa-team__figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.page-about .pa-team__figure figcaption {
  margin-top: 0.5rem;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.7);
}

.page-about .pa-team__note {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.85);
  padding: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.06);
}

/* ---------- 服务承诺 ---------- */

.page-about .pa-commitments {
  padding: 5rem 0;
}

.page-about .pa-commitments__grid {
  display: grid;
  gap: 1.5rem;
}

.page-about .pa-commitment {
  position: relative;
  background: var(--soft-white);
  border: 1px solid var(--line-beige);
  border-radius: var(--radius-md);
  padding: 1.75rem 1.5rem;
  box-shadow: var(--shadow-sm);
}

.page-about .pa-commitment::after {
  content: "";
  position: absolute;
  right: -8px;
  bottom: -8px;
  width: 40px;
  height: 40px;
  border-right: 3px solid var(--vivid-orange);
  border-bottom: 3px solid var(--vivid-orange);
  border-radius: 0 var(--radius-md) 0 var(--radius-md);
  pointer-events: none;
}

.page-about .pa-commitment .ly-index {
  display: block;
  font-size: 1.25rem;
  color: var(--vivid-orange);
  margin-bottom: 0.75rem;
}

.page-about .pa-commitment h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

.page-about .pa-commitment p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted-slate);
  line-height: 1.7;
}

.page-about .pa-commitments__footer {
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 2px solid var(--charcoal);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.page-about .pa-commitments__footer p {
  max-width: 36em;
  font-size: 0.9rem;
  color: var(--muted-slate);
  margin: 0;
}

.page-about .pa-commitments__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .pa-commitments .ly-btn--ghost {
  border: 1px solid var(--deep-green);
  color: var(--deep-green);
}

/* ---------- 桌面端响应式增强 ---------- */

@media (min-width: 768px) {
  .page-about .pa-section-head {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-end;
  }

  .page-about .pa-section-head__note {
    text-align: right;
    max-width: 18rem;
  }

  .page-about .pa-commitments__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.75rem;
  }

  .page-about .pa-commitment:nth-child(even) {
    margin-top: 2rem;
  }

  .page-about .pa-commitments__footer {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

@media (min-width: 860px) {
  .page-about .pa-hero__grid {
    grid-template-columns: 200px 1fr;
    gap: 2.5rem;
    align-items: center;
  }

  .page-about .pa-hero__figure img {
    width: 280px;
  }
}

@media (min-width: 900px) {
  .page-about .pa-manifesto__layout {
    grid-template-columns: 230px 1fr;
    gap: 4rem;
  }

  .page-about .pa-toc {
    position: sticky;
    top: 5rem;
  }

  .page-about .pa-team__layout {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 3.5rem;
    align-items: center;
  }
}

@media (min-width: 992px) {
  .page-about .pa-milestones__layout {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 3.5rem;
    align-items: start;
  }
}

/* ---------- 减少动态偏好 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about {
    scroll-behavior: auto;
  }

  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}