/* ==========================================================
   价值主张页  .page-about
   ========================================================== */

.page-about {
  --trunk-gutter: 26px;
  --trunk-line: 6px;
  --soft-text: #C3CDD8;
  padding-bottom: 72px;
}

.page-about [data-season="spring"] {
  --acc: var(--spring);
  --acc-soft: rgba(123, 201, 111, 0.16);
}
.page-about [data-season="summer"] {
  --acc: var(--summer);
  --acc-soft: rgba(43, 179, 192, 0.16);
}
.page-about [data-season="autumn"] {
  --acc: var(--autumn);
  --acc-soft: rgba(227, 154, 59, 0.16);
}
.page-about [data-season="winter"] {
  --acc: var(--winter-lit);
  --acc-soft: rgba(90, 109, 168, 0.22);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 26px 0 0;
  font-size: 13px;
  color: var(--muted);
}
.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.25s var(--ease);
}
.page-about .breadcrumb a:hover {
  color: var(--summer);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 28px 0 0;
}

.page-about .about-title {
  margin: 16px 0 0;
  font-size: clamp(32px, 8vw, 74px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--pure);
}

.page-about .about-lead {
  margin: 22px 0 0;
  max-width: 40rem;
  font-size: 16px;
  line-height: 1.9;
  color: var(--soft-text);
}

.page-about .hero-scale {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}
.page-about .hero-scale li {
  background: var(--ink-2);
  padding: 18px 16px 20px;
  display: grid;
  gap: 6px;
  align-content: start;
}
.page-about .hero-scale li::before {
  content: "";
  display: block;
  width: 20px;
  height: 3px;
  border-radius: 3px;
  background: var(--acc);
  margin-bottom: 6px;
}
.page-about .hero-scale-key {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--mist);
}
.page-about .hero-scale-val {
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 纵向枝干 ---------- */
.page-about .trunk {
  position: relative;
  margin-top: 64px;
  padding-left: var(--trunk-gutter);
  display: grid;
  gap: 64px;
}
.page-about .trunk::before {
  content: "";
  position: absolute;
  left: var(--trunk-line);
  top: 6px;
  bottom: 6px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(
    180deg,
    var(--spring) 0%,
    var(--summer) 34%,
    var(--autumn) 67%,
    var(--winter-lit) 100%
  );
  opacity: 0.45;
}

.page-about .node {
  position: relative;
  scroll-margin-top: 80px;
}

.page-about .node-ring {
  position: absolute;
  top: 5px;
  left: calc(var(--trunk-line) - 7px - var(--trunk-gutter));
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink);
  box-shadow: 0 0 0 2px var(--acc);
  z-index: 1;
}
.page-about .node-ring::after {
  content: "";
  position: absolute;
  inset: 4px;
  border-radius: 50%;
  background: var(--acc);
}

.page-about .node-head {
  max-width: 46rem;
}
.page-about .node-head .section-title {
  margin: 12px 0 0;
  font-size: clamp(22px, 4.6vw, 36px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--pure);
}
.page-about .node-head .lead {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 图文错落 ---------- */
.page-about .node-split {
  margin-top: 26px;
  display: grid;
  gap: 26px;
}
.page-about .prose {
  display: grid;
  gap: 16px;
}
.page-about .prose p {
  margin: 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--soft-text);
}

.page-about .media {
  margin: 0;
  max-width: 100%;
}
.page-about .media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: var(--ink-2);
}
.page-about .media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}
.page-about .ar-1x1 { aspect-ratio: 1 / 1; }
.page-about .ar-8x5 { aspect-ratio: 8 / 5; }
.page-about .ar-2x1 { aspect-ratio: 2 / 1; }

.page-about .media-caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 四季卷宗 ---------- */
.page-about .scrolls {
  margin-top: 26px;
  display: grid;
  gap: 12px;
}
.page-about .scroll {
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: border-color 0.3s var(--ease);
}
.page-about .scroll:hover,
.page-about .scroll[open] {
  border-color: var(--acc);
}
.page-about .scroll > summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 8px 12px;
  padding: 18px;
}
.page-about .scroll > summary::-webkit-details-marker {
  display: none;
}
.page-about .scroll-tag {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--acc);
  border: 1px solid var(--acc);
  border-radius: 999px;
  padding: 3px 10px;
  white-space: nowrap;
}
.page-about .scroll-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--pure);
}
.page-about .scroll-hint {
  grid-column: 1 / -1;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}
.page-about .scroll-mark {
  position: relative;
  justify-self: end;
  width: 16px;
  height: 16px;
}
.page-about .scroll-mark::before,
.page-about .scroll-mark::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background: var(--acc);
  border-radius: 2px;
  transform: translate(-50%, -50%);
}
.page-about .scroll-mark::before {
  width: 14px;
  height: 2px;
}
.page-about .scroll-mark::after {
  width: 2px;
  height: 14px;
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}
.page-about .scroll[open] .scroll-mark::after {
  transform: translate(-50%, -50%) scaleY(0);
  opacity: 0;
}
.page-about .scroll-body {
  padding: 18px;
  display: grid;
  gap: 14px;
  border-top: 1px solid var(--line);
}
.page-about .scroll-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--soft-text);
}
.page-about .scroll-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.page-about .scroll-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}
.page-about .scroll-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--acc);
  opacity: 0.85;
}
.page-about .scroll-link {
  justify-self: start;
  font-size: 14px;
  color: var(--acc);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s var(--ease);
}
.page-about .scroll-link:hover,
.page-about .scroll-link:focus-visible {
  border-bottom-color: var(--acc);
}

/* ---------- 团队与角色 ---------- */
.page-about .team-wrap {
  margin-top: 26px;
  display: grid;
  gap: 28px;
}
.page-about .teams {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
}
.page-about .team {
  position: relative;
  padding: 20px 18px 20px 22px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}
.page-about .team::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--acc);
  opacity: 0.85;
}
.page-about .team:hover {
  transform: translateY(-4px);
  border-color: var(--acc);
}
.page-about .team-name {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--pure);
}
.page-about .team-desc {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .review {
  margin-top: 24px;
  padding: 22px 20px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: linear-gradient(
    135deg,
    rgba(123, 201, 111, 0.09),
    rgba(43, 179, 192, 0.06) 45%,
    rgba(227, 154, 59, 0.07)
  );
}
.page-about .review-title {
  margin: 0 0 10px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--mist);
}
.page-about .review-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--soft-text);
}

/* ---------- 版本演进 ---------- */
.page-about .version-media {
  margin-top: 28px;
}

.page-about .versions {
  list-style: none;
  position: relative;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 22px;
}
.page-about .versions::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: var(--line);
}
.page-about .ver {
  position: relative;
  padding-left: 26px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2px 10px;
}
.page-about .ver-node {
  position: absolute;
  left: 0;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--acc);
  box-shadow: 0 0 0 4px var(--acc-soft);
  transition: box-shadow 0.3s var(--ease);
}
.page-about .ver:hover .ver-node {
  box-shadow: 0 0 0 8px var(--acc-soft);
}
.page-about .ver-num {
  grid-column: 1;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--acc);
}
.page-about .ver-name {
  grid-column: 2;
  font-size: 16px;
  font-weight: 700;
  color: var(--pure);
}
.page-about .ver-note {
  grid-column: 1 / -1;
  margin: 5px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 做事标准 ---------- */
.page-about .standards {
  margin-top: 28px;
  display: grid;
  gap: 16px;
}
.page-about .standard {
  position: relative;
  padding: 24px 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--ink-2);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}
.page-about .standard::after {
  content: "";
  position: absolute;
  left: 20px;
  right: 20px;
  top: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--acc);
  opacity: 0.9;
}
.page-about .standard:hover {
  transform: translateY(-4px);
  border-color: var(--acc);
}
.page-about .standard-no {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--acc);
  opacity: 0.85;
}
.page-about .standard-name {
  margin: 12px 0 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--pure);
}
.page-about .standard-text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 资质与合规 ---------- */
.page-about .certs {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.page-about .certs li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 16px;
  align-items: baseline;
  padding: 16px 2px;
  border-bottom: 1px solid var(--line);
}
.page-about .cert-no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.page-about .cert-name {
  font-size: 16px;
  color: var(--mist);
}
.page-about .cert-val {
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--autumn);
}
.page-about .cert-note {
  margin: 20px 0 0;
  max-width: 40rem;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 下一页入口 ---------- */
.page-about .about-next {
  margin-top: 80px;
  padding-top: 40px;
  border-top: 1px solid var(--line);
}
.page-about .about-next .section-title {
  margin: 12px 0 0;
  font-size: clamp(22px, 4.6vw, 34px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--pure);
}
.page-about .next-grid {
  margin-top: 26px;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}
.page-about .next-link {
  display: grid;
  gap: 6px;
  padding: 20px 18px;
  background: var(--ink-2);
  text-decoration: none;
  transition: background 0.3s var(--ease);
}
.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  background: #1C2634;
}
.page-about .next-k {
  font-size: 16px;
  font-weight: 700;
  color: var(--pure);
}
.page-about .next-k::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--acc);
  margin-right: 10px;
  vertical-align: middle;
}
.page-about .next-v {
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ==========================================================
   响应式
   ========================================================== */

@media (min-width: 720px) {
  .page-about .hero-scale {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .node-split {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 40px;
    align-items: start;
  }
  .page-about .teams {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .standards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }
  .page-about .next-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .certs li {
    grid-template-columns: auto 1fr auto;
    gap: 14px;
  }
  .page-about .cert-val {
    grid-column: 3;
  }
}

@media (min-width: 900px) {
  .page-about {
    --trunk-gutter: 64px;
    --trunk-line: 14px;
  }
  .page-about .trunk {
    margin-top: 88px;
    gap: 108px;
  }
  .page-about .node-head {
    max-width: 54rem;
  }
  .page-about .node-split {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 56px;
  }
  .page-about .team-wrap {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
    align-items: start;
  }
  .page-about .teams {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .next-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  /* 版本刻度转为横向 */
  .page-about .versions {
    grid-template-columns: repeat(7, minmax(0, 1fr));
    gap: 14px;
    margin-top: 44px;
    overflow: hidden;
  }
  .page-about .versions::before {
    display: none;
  }
  .page-about .ver {
    padding: 42px 0 0;
    grid-template-columns: 1fr;
    gap: 4px;
  }
  .page-about .ver-num,
  .page-about .ver-name,
  .page-about .ver-note {
    grid-column: 1;
  }
  .page-about .ver-name {
    font-size: 15px;
  }
  .page-about .ver-node {
    left: 0;
    top: 6px;
  }
  .page-about .ver-node::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 16px;
    width: 100vw;
    height: 2px;
    transform: translateY(-50%);
    background: linear-gradient(90deg, var(--acc), rgba(0, 0, 0, 0) 72%);
    opacity: 0.5;
  }
  .page-about .ver:last-child .ver-node::after {
    display: none;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero {
    padding-top: 40px;
  }
  .page-about .about-lead {
    font-size: 17px;
  }
  .page-about .prose p {
    font-size: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .scroll,
  .page-about .scroll-mark::after,
  .page-about .team,
  .page-about .standard,
  .page-about .ver-node,
  .page-about .next-link,
  .page-about .breadcrumb a,
  .page-about .scroll-link {
    transition: none;
  }
  .page-about .team:hover,
  .page-about .standard:hover {
    transform: none;
  }
}