/* ============ 品牌文化页 /culture/ ============ */
.page-about {
  --ab-rail-w: 190px;
  --ab-gap: 48px;
  --ab-hair: rgba(34, 48, 76, 0.9);
  display: block;
}

/* ---- 面包屑 ---- */
.page-about .about-crumb-wrap {
  padding-top: 22px;
}
.page-about .breadcrumb {
  font-size: 13px;
  letter-spacing: 0.02em;
}

/* ---- 首屏 ---- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -180px;
  right: -120px;
  width: 560px;
  height: 560px;
  border-radius: 50%;
  background: radial-gradient(circle at 60% 40%, rgba(255, 122, 47, 0.16), rgba(255, 122, 47, 0) 68%);
  pointer-events: none;
}
.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding-top: 18px;
  padding-bottom: 44px;
}
.page-about .about-title {
  margin: 12px 0 18px;
  font-size: clamp(34px, 9vw, 68px);
  line-height: 1.02;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--white);
}
.page-about .about-title__em {
  display: block;
  color: var(--orange);
}
.page-about .about-lede {
  margin: 0;
  max-width: 44ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--gray);
}
.page-about .about-hero__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-soft);
  overflow: hidden;
  background: var(--deep);
}
.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(118deg, rgba(5, 7, 15, 0.7) 0%, rgba(5, 7, 15, 0) 55%, rgba(47, 227, 210, 0.14) 100%);
  pointer-events: none;
}
.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
}

/* ---- 主体两栏 ---- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding-bottom: 72px;
}

/* 章节索引 */
.page-about .about-rail {
  position: relative;
  border-bottom: 1px solid var(--line);
}
.page-about .about-rail__label {
  display: none;
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--gray);
}
.page-about .about-index {
  list-style: none;
  margin: 0;
  padding: 0 0 12px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-about .about-index::-webkit-scrollbar {
  display: none;
}
.page-about .about-index a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  color: var(--gray);
  text-decoration: none;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}
.page-about .about-index a .data-num {
  font-size: 11px;
  color: var(--cyan);
}
.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--white);
  border-color: var(--cyan);
  background: rgba(47, 227, 210, 0.08);
}

/* ---- 章节通用 ---- */
.page-about .about-section {
  border-top: 1px solid var(--line);
  padding: 32px 0 42px;
  scroll-margin-top: 96px;
}
.page-about .about-section:first-child {
  border-top: 0;
  padding-top: 4px;
}
.page-about .about-section > .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gray);
}
.page-about .about-section > .eyebrow .data-num {
  color: var(--orange);
  letter-spacing: 0;
}
.page-about .about-section h2 {
  margin: 0 0 18px;
  font-size: clamp(22px, 5vw, 32px);
  line-height: 1.24;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--white);
  max-width: 22ch;
}
.page-about .about-prose p {
  margin: 0 0 16px;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--gray);
}
.page-about .about-prose p:last-child {
  margin-bottom: 0;
}
.page-about .about-prose strong {
  color: var(--white);
  font-weight: 600;
}
.page-about .about-prose a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 227, 210, 0.35);
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}
.page-about .about-prose a:hover,
.page-about .about-prose a:focus-visible {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan-soft);
}
.page-about .about-prose--tail {
  margin-top: 18px;
}
.page-about .about-prose--tail p {
  font-size: 14.5px;
  color: var(--gray);
}

/* 悬挂引言 */
.page-about .about-quote {
  margin: 28px 0;
  padding: 0 0 0 20px;
  border-left: 2px solid var(--orange);
  max-width: 26ch;
  font-size: clamp(19px, 4.4vw, 26px);
  line-height: 1.5;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--white);
}

/* ---- 时间线主题带 ---- */
.page-about .about-timeline-wrap {
  position: relative;
  margin: 22px 0 4px;
  padding: 30px 22px 26px;
  border: 1px solid var(--line);
  border-radius: 28px 16px 30px 18px;
  background: linear-gradient(158deg, var(--deep) 0%, rgba(19, 28, 49, 0.92) 100%);
  overflow: hidden;
}
.page-about .about-timeline-wrap::before {
  content: "";
  position: absolute;
  top: -60%;
  left: -12%;
  width: 66%;
  height: 220%;
  background: linear-gradient(100deg, rgba(47, 227, 210, 0.1), rgba(47, 227, 210, 0) 72%);
  transform: rotate(6deg);
  pointer-events: none;
}
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 22px;
}
.page-about .tl-item {
  position: relative;
  padding-left: 22px;
}
.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 10px;
  bottom: -22px;
  width: 1px;
  background: var(--line);
}
.page-about .tl-item:last-child::before {
  display: none;
}
.page-about .tl-item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  background: var(--ink);
}
.page-about .tl-time {
  margin: 0 0 4px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}
.page-about .tl-title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
}
.page-about .tl-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--gray);
}
.page-about .tl-item .tl-time {
  margin-bottom: 5px;
}

/* ---- 通用媒体框 ---- */
.page-about .about-media {
  margin: 0 0 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--deep);
  position: relative;
}
.page-about .about-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5, 7, 15, 0) 45%, rgba(5, 7, 15, 0.55) 100%);
  pointer-events: none;
}
.page-about .about-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

/* ---- 流程步骤（纯 CSS 切换） ---- */
.page-about .flow {
  position: relative;
}
.page-about .flow-input {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  overflow: hidden;
  white-space: nowrap;
}
.page-about .flow-tabs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 16px;
}
.page-about .flow-tab {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(19, 28, 49, 0.5);
  font-size: 14px;
  color: var(--gray);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease), background 0.18s var(--ease);
}
.page-about .flow-tab .data-num {
  font-size: 11px;
  color: var(--gray);
}
.page-about .flow-tab:hover {
  color: var(--white);
  border-color: var(--line);
  background: rgba(34, 48, 76, 0.55);
}
.page-about #flow-1:checked ~ .flow-tabs label[for="flow-1"],
.page-about #flow-2:checked ~ .flow-tabs label[for="flow-2"],
.page-about #flow-3:checked ~ .flow-tabs label[for="flow-3"],
.page-about #flow-4:checked ~ .flow-tabs label[for="flow-4"] {
  border-color: var(--orange);
  color: var(--cyan);
  background: rgba(255, 122, 47, 0.09);
}
.page-about #flow-1:checked ~ .flow-tabs label[for="flow-1"] .data-num,
.page-about #flow-2:checked ~ .flow-tabs label[for="flow-2"] .data-num,
.page-about #flow-3:checked ~ .flow-tabs label[for="flow-3"] .data-num,
.page-about #flow-4:checked ~ .flow-tabs label[for="flow-4"] .data-num {
  color: var(--orange);
}
.page-about #flow-1:focus-visible ~ .flow-tabs label[for="flow-1"],
.page-about #flow-2:focus-visible ~ .flow-tabs label[for="flow-2"],
.page-about #flow-3:focus-visible ~ .flow-tabs label[for="flow-3"],
.page-about #flow-4:focus-visible ~ .flow-tabs label[for="flow-4"] {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}
.page-about .flow-panels {
  border: 1px solid var(--line);
  border-radius: var(--radius-soft);
  background: var(--panel);
  padding: 22px 20px;
}
.page-about .flow-panel {
  display: none;
}
.page-about #flow-1:checked ~ .flow-panels [data-step="1"],
.page-about #flow-2:checked ~ .flow-panels [data-step="2"],
.page-about #flow-3:checked ~ .flow-panels [data-step="3"],
.page-about #flow-4:checked ~ .flow-panels [data-step="4"] {
  display: block;
  animation: ab-fade 0.16s var(--ease) both;
}
@keyframes ab-fade {
  from { opacity: 0; }
  to { opacity: 1; }
}
.page-about .flow-heading {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
}
.page-about .flow-panel > p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--gray);
  max-width: 66ch;
}
.page-about .flow-facts {
  display: grid;
  gap: 12px;
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}
.page-about .flow-facts dt {
  margin: 0;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--gray);
}
.page-about .flow-facts dd {
  margin: 5px 0 0;
  font-size: 14px;
  color: var(--white);
}

/* ---- 数据口径规则列表 ---- */
.page-about .about-rules {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
}
.page-about .about-rules li {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}
.page-about .about-rules li:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .rule-num {
  font-size: 12px;
  color: var(--cyan);
  padding-top: 4px;
}
.page-about .about-rules h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}
.page-about .about-rules p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--gray);
  max-width: 64ch;
}

/* ---- 团队 ---- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 6px;
}
.page-about .team-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .team-list li {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}
.page-about .team-list li:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .team-size {
  margin: 0;
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}
.page-about .team-list h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}
.page-about .team-list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--gray);
}
.page-about .about-team__media {
  margin: 0;
}

/* ---- 版本节点 ---- */
.page-about .about-versions {
  margin-top: 6px;
}
.page-about .version-node {
  border-top: 1px solid var(--line);
}
.page-about .version-node:last-child {
  border-bottom: 1px solid var(--line);
}
.page-about .version-node > summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: 60px minmax(0, 1fr) 18px;
  align-items: center;
  gap: 14px;
  padding: 15px 0;
  transition: color 0.18s var(--ease);
}
.page-about .version-node > summary::-webkit-details-marker {
  display: none;
}
.page-about .version-node > summary:hover .vn-no,
.page-about .version-node > summary:focus-visible .vn-no {
  color: var(--orange);
}
.page-about .version-node > summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}
.page-about .vn-no {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  transition: color 0.18s var(--ease);
}
.page-about .vn-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
}
.page-about .vn-mark {
  position: relative;
  width: 14px;
  height: 14px;
  justify-self: end;
}
.page-about .vn-mark::before,
.page-about .vn-mark::after {
  content: "";
  position: absolute;
  background: var(--gray);
}
.page-about .vn-mark::before {
  top: 6px;
  left: 0;
  width: 14px;
  height: 1px;
}
.page-about .vn-mark::after {
  top: 0;
  left: 6px;
  width: 1px;
  height: 14px;
  transition: transform 0.2s var(--ease);
}
.page-about .version-node[open] .vn-mark::after {
  transform: scaleY(0);
}
.page-about .vn-body {
  padding: 0 0 18px 74px;
}
.page-about .vn-body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--gray);
  max-width: 64ch;
}

/* ---- 合作列表 ---- */
.page-about .coop-list {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
}
.page-about .coop-list li {
  padding: 18px 0;
  border-top: 1px solid var(--line);
}
.page-about .coop-list li:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .coop-no {
  margin: 0 0 8px;
  font-size: 12px;
  color: var(--orange);
}
.page-about .coop-name {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}
.page-about .coop-desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--gray);
  max-width: 64ch;
}

/* ---- 收束行动区 ---- */
.page-about .about-cta {
  margin-top: 30px;
  padding: 24px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-soft);
  background: linear-gradient(150deg, rgba(19, 28, 49, 0.9) 0%, rgba(11, 18, 32, 0.95) 100%);
  display: grid;
  gap: 16px;
}
.page-about .about-cta p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--gray);
  max-width: 56ch;
}
.page-about .about-cta p a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 227, 210, 0.35);
}
.page-about .about-cta p a:hover,
.page-about .about-cta p a:focus-visible {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan-soft);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ============ 断点：平板 720px ============ */
@media (min-width: 720px) {
  .page-about .about-hero__grid {
    padding-bottom: 60px;
  }
  .page-about .flow-tabs {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .flow-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
  .page-about .about-timeline-wrap {
    padding: 34px 30px 30px;
  }
  .page-about .tl-item {
    display: grid;
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 0 16px;
    align-items: start;
    padding-left: 24px;
  }
  .page-about .tl-time {
    padding-top: 3px;
    margin-bottom: 0;
  }
  .page-about .nl-title {
    margin-top: 0;
  }
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 24px;
    padding: 26px 26px;
  }
  .page-about .coop-list li {
    display: grid;
    grid-template-columns: 42px 138px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }
  .page-about .coop-no,
  .page-about .coop-name {
    margin-bottom: 0;
  }
}

/* ============ 断点：桌面 900px ============ */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: end;
    gap: 44px;
  }
  .page-about .about-layout {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: var(--ab-gap);
  }
  .page-about .about-rail {
    border-bottom: 0;
  }
  .page-about .about-rail__inner {
    position: sticky;
    top: 96px;
  }
  .page-about .about-rail__label {
    display: block;
  }
  .page-about .about-index {
    flex-direction: column;
    gap: 0;
    padding: 0;
    overflow: visible;
  }
  .page-about .about-index a {
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
    background: transparent;
    padding: 8px 0 8px 12px;
    white-space: normal;
    font-size: 14px;
  }
  .page-about .about-index a:hover,
  .page-about .about-index a:focus-visible {
    background: transparent;
    border-left-color: var(--cyan);
    color: var(--white);
  }
  .page-about .about-section {
    padding: 38px 0 50px;
  }
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) 250px;
    gap: 32px;
    align-items: start;
  }
  .page-about .about-team__media {
    margin-bottom: 0;
  }
  .page-about .about-quote {
    margin-left: 0;
  }
}

/* ============ 断点：宽屏 1180px ============ */
@media (min-width: 1180px) {
  .page-about .about-hero__grid {
    gap: 64px;
  }
  .page-about .about-rail__inner {
    border-left: 1px solid var(--line);
    padding-left: 22px;
  }
  .page-about .about-index a {
    border-left: 0;
    padding-left: 0;
    margin-left: -22px;
    padding-right: 4px;
  }
  .page-about .about-index a:hover,
  .page-about .about-index a:focus-visible {
    border-left-color: transparent;
  }
}

/* ============ 减弱动效 ============ */
@media (prefers-reduced-motion: reduce) {
  .page-about .flow-panel {
    animation: none !important;
  }
  .page-about .vn-mark::after {
    transition: none;
  }
  .page-about .about-index a,
  .page-about .flow-tab,
  .page-about .vn-no {
    transition: none;
  }
}
</main>