/* ================= 品牌文化页 · page-about ================= */

.page-about {
  --about-spine-x: 15px;
  --about-spine-gap: 46px;
  background: var(--paper);
  color: var(--night-ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--deep-green);
  color: var(--paper);
  padding: calc(var(--header-h) + 52px) 0 64px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  left: 32%;
  right: -14%;
  bottom: -36%;
  height: 92%;
  background: linear-gradient(122deg, var(--indigo) 0%, rgba(30, 58, 95, 0) 84%);
  clip-path: polygon(0 100%, 24% 0, 100% 0, 100% 100%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 5%;
  top: 24%;
  width: 108px;
  height: 6px;
  background: var(--track-red);
  transform: skewX(-24deg);
  pointer-events: none;
}

.page-about .about-hero .wrap {
  position: relative;
  z-index: 1;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin: 0 0 30px;
}

.page-about .breadcrumb__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  font-size: 12px;
  letter-spacing: 0.04em;
}

.page-about .breadcrumb__item {
  display: inline-flex;
  align-items: center;
  color: var(--cement);
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 6px;
  color: rgba(185, 192, 196, 0.45);
}

.page-about .breadcrumb a {
  color: var(--cement);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--d-fast) ease, border-color var(--d-fast) ease;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--track-red);
}

/* ---------- 首屏内容 ---------- */
.page-about .hero-inner {
  display: grid;
  gap: 36px;
}

.page-about .hero-copy {
  max-width: 660px;
}

.page-about .about-hero .eyebrow {
  margin: 0 0 16px;
  color: var(--track-red);
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-family: var(--font-cond);
  font-size: clamp(29px, 7vw, 54px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.01em;
}

.page-about .hero-lead {
  margin: 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 241, 234, 0.78);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ---------- 首屏数据 ---------- */
.page-about .hero-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(185, 192, 196, 0.18);
  border: 1px solid rgba(185, 192, 196, 0.18);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .hero-stats li {
  background: rgba(12, 36, 33, 0.72);
  padding: 16px 14px 18px;
}

.page-about .hero-stats .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .hero-stats .stat-num small {
  margin-left: 4px;
  font-size: 12px;
  color: var(--cement);
}

.page-about .hero-stats .stat-label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.55;
  color: var(--cement);
}

/* ---------- 纵向脊线 ---------- */
.page-about .about-spine {
  background: var(--paper);
  padding: 56px 0 8px;
}

.page-about .about-spine__inner {
  position: relative;
  padding-left: var(--about-spine-gap);
}

.page-about .about-spine__inner::before {
  content: "";
  position: absolute;
  left: var(--about-spine-x);
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(
    180deg,
    rgba(185, 192, 196, 0) 0%,
    var(--line-strong) 5%,
    var(--line-strong) 94%,
    rgba(185, 192, 196, 0) 100%
  );
}

/* ---------- 时间轴区块 ---------- */
.page-about .tl-block {
  position: relative;
  padding-bottom: 56px;
}

.page-about .tl-block:last-child {
  padding-bottom: 20px;
}

.page-about .tl-node {
  position: absolute;
  top: 2px;
  left: calc(var(--about-spine-x) - var(--about-spine-gap));
  transform: translateX(-50%);
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.02em;
  color: var(--cement);
  background: var(--deep-green);
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  transition: background var(--d-fast) ease, color var(--d-fast) ease,
    border-color var(--d-fast) ease, box-shadow var(--d-fast) ease;
}

.page-about .tl-node.is-lit {
  background: var(--track-red);
  border-color: var(--track-red);
  color: #ffffff;
  box-shadow: 0 0 0 4px rgba(226, 58, 58, 0.16);
}

.page-about .tl-content {
  max-width: 780px;
}

.page-about .tl-content .eyebrow {
  margin: 0 0 10px;
  color: var(--ink-soft);
}

.page-about .tl-content h2 {
  margin: 0 0 18px;
  font-family: var(--font-cond);
  font-size: clamp(20px, 4.4vw, 30px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.005em;
  color: var(--night-ink);
}

.page-about .about-prose {
  margin: 0 0 16px;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--night-ink);
}

.page-about .about-prose:last-of-type {
  margin-bottom: 0;
}

.page-about .tl-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 24px 0 0;
}

/* ---------- 配图 ---------- */
.page-about .about-figure {
  margin: 26px 0 0;
  padding: 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--night-ink);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure--square {
  max-width: 520px;
}

.page-about .about-cap {
  display: block;
  padding: 11px 14px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--cement);
  border-top: 1px solid rgba(185, 192, 196, 0.16);
}

/* ---------- 团队分工 ---------- */
.page-about .crew-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--sand);
  border: 1px solid var(--sand);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .crew-list li {
  background: var(--paper);
  padding: 16px 16px 18px;
}

.page-about .crew-name {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  font-weight: 500;
  color: var(--track-red);
}

.page-about .crew-list span {
  font-size: 14px;
  line-height: 1.75;
  color: var(--night-ink);
}

/* ---------- 三道校验 ---------- */
.page-about .check-steps {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .check-step {
  padding: 18px 18px 16px 20px;
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-left: 4px solid var(--cement);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}

.page-about .check-step[data-stage="collect"] {
  border-left-color: var(--track-red);
}

.page-about .check-step[data-stage="cross"] {
  border-left-color: var(--indigo);
}

.page-about .check-step[data-stage="publish"] {
  border-left-color: var(--celadon);
}

.page-about .check-step h3 {
  margin: 0 0 8px;
  font-family: var(--font-cond);
  font-size: 16px;
  font-weight: 800;
  color: var(--night-ink);
}

.page-about .check-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--night-ink);
}

.page-about .check-step__std {
  display: block;
  margin-top: 12px;
  padding-top: 10px;
  width: 100%;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink-soft);
  border-top: 1px dashed var(--line-strong);
}

/* ---------- 阶段轨道 ---------- */
.page-about .stage-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .stage {
  position: relative;
  padding-left: 46px;
}

.page-about .stage::before {
  content: "";
  position: absolute;
  left: 0;
  top: 2px;
  width: 30px;
  height: 30px;
  background: var(--deep-green);
  border-radius: 3px;
  box-shadow: inset 0 0 0 1px rgba(185, 192, 196, 0.4);
}

.page-about .stage h3 {
  margin: 4px 0 6px;
  font-family: var(--font-cond);
  font-size: 16px;
  font-weight: 800;
  color: var(--night-ink);
}

.page-about .stage p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--night-ink);
}

/* ---------- 覆盖范围数据 ---------- */
.page-about .coverage-facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--sand);
  border: 1px solid var(--sand);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .coverage-facts li {
  background: var(--paper);
  padding: 16px 14px 18px;
}

.page-about .coverage-facts .mono {
  display: block;
  font-size: 24px;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--track-red);
}

.page-about .coverage-facts em {
  display: block;
  margin-top: 8px;
  font-style: normal;
  font-size: 12px;
  line-height: 1.55;
  color: var(--ink-soft);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  position: relative;
  overflow: hidden;
  background: var(--indigo);
  color: var(--paper);
  padding: 64px 0;
}

.page-about .about-partners::before {
  content: "";
  position: absolute;
  right: -8%;
  top: -30%;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(124, 34, 48, 0.55) 0%, rgba(124, 34, 48, 0) 70%);
  pointer-events: none;
}

.page-about .partners-grid {
  position: relative;
  display: grid;
  gap: 32px;
}

.page-about .partners-copy {
  max-width: 560px;
}

.page-about .partners-copy .eyebrow {
  margin: 0 0 12px;
  color: var(--ref-yellow);
}

.page-about .partners-copy h2 {
  margin: 0 0 18px;
  font-family: var(--font-cond);
  font-size: clamp(20px, 4.6vw, 30px);
  font-weight: 800;
  line-height: 1.28;
  color: var(--paper);
}

.page-about .partners-copy p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 241, 234, 0.82);
}

.page-about .partner-cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .partner-cards li {
  padding: 18px 18px 20px;
  background: rgba(16, 23, 26, 0.34);
  border: 1px solid rgba(185, 192, 196, 0.24);
  border-radius: var(--radius-lg);
}

.page-about .partner-idx {
  display: inline-block;
  margin-bottom: 10px;
  padding: 2px 8px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--deep-green);
  background: var(--celadon);
  border-radius: 2px;
}

.page-about .partner-cards h3 {
  margin: 0 0 8px;
  font-family: var(--font-cond);
  font-size: 16px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .partner-cards p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 241, 234, 0.76);
}

/* ---------- 服务支持 ---------- */
.page-about .about-support {
  background: var(--deep-green);
  color: var(--paper);
  padding: 64px 0 72px;
}

.page-about .about-support .eyebrow {
  margin: 0 0 12px;
  color: var(--track-red);
}

.page-about .about-support h2 {
  margin: 0 0 16px;
  font-family: var(--font-cond);
  font-size: clamp(20px, 4.6vw, 30px);
  font-weight: 800;
  line-height: 1.28;
  color: var(--paper);
}

.page-about .support-lead {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 241, 234, 0.8);
}

.page-about .support-grid {
  display: grid;
  gap: 14px;
  margin-top: 32px;
}

.page-about .support-card {
  padding: 20px 18px 22px;
  background: rgba(16, 23, 26, 0.5);
  border: 1px solid rgba(185, 192, 196, 0.2);
  border-top: 3px solid var(--track-red);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.page-about .support-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-cond);
  font-size: 16px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .support-card p {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 241, 234, 0.78);
}

.page-about .support-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 34px 0 0;
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about {
    --about-spine-x: 24px;
    --about-spine-gap: 72px;
  }

  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .crew-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .check-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .coverage-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .support-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 980px) {
  .page-about {
    --about-spine-x: 44px;
    --about-spine-gap: 104px;
  }

  .page-about .about-hero {
    padding: calc(var(--header-h) + 76px) 0 92px;
  }

  .page-about .hero-inner {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    align-items: end;
    gap: 56px;
  }

  .page-about .hero-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-spine {
    padding: 88px 0 24px;
  }

  .page-about .tl-block {
    padding-bottom: 88px;
  }

  .page-about .tl-node {
    width: 40px;
    height: 40px;
    font-size: 13px;
  }

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

  .page-about .tl-block:nth-child(even) .tl-content {
    margin-left: 44px;
  }

  .page-about .about-partners,
  .page-about .about-support {
    padding: 88px 0;
  }

  .page-about .partners-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 64px;
    align-items: start;
  }

  /* 阶段轨道转为横向推进 */
  .page-about .stage-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    margin-top: 34px;
  }

  .page-about .stage {
    padding: 44px 22px 0 0;
  }

  .page-about .stage::before {
    top: 6px;
  }

  .page-about .stage::after {
    content: "";
    position: absolute;
    left: 38px;
    right: 0;
    top: 21px;
    height: 1px;
    background: var(--line-strong);
  }

  .page-about .stage:last-child::after {
    display: none;
  }

  .page-about .stage h3 {
    margin-top: 0;
  }
}

/* ---------- 超宽屏微调 ---------- */
@media (min-width: 1200px) {
  .page-about .tl-content {
    max-width: 860px;
  }

  .page-about .about-figure--square {
    max-width: 560px;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .tl-node,
  .page-about .breadcrumb a {
    transition: none;
  }

  .page-about .about-hero::after {
    transform: none;
  }
}