.page-about {
  --about-rule: 2px solid var(--ink-graphite);
  --about-gap: 24px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 40px 0 36px;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 22px;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: start;
}

.page-about .about-hero__title {
  margin: 12px 0 18px;
  max-width: 20ch;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 62ch;
  color: var(--steel-blue);
  font-size: 1rem;
  line-height: 1.8;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: 1fr;
  margin: 0;
  border: var(--about-rule);
  background: var(--ink-carbon);
}

.page-about .about-stat {
  padding: 18px 20px;
  border-bottom: var(--about-rule);
}

.page-about .about-stat:last-child {
  border-bottom: 0;
}

.page-about .about-stat dt {
  margin: 0 0 6px;
  color: var(--steel-blue);
  font-size: 12px;
  letter-spacing: .08em;
}

.page-about .about-stat dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .about-stat__num {
  color: var(--cyan-neon);
  font-size: 30px;
  font-weight: 700;
  line-height: 1.1;
}

.page-about .about-stat__unit {
  color: var(--mist-white);
  font-size: 13px;
}

/* ---------- 通栏图 ---------- */
.page-about .about-banner {
  position: relative;
  margin: 0;
  border-top: var(--about-rule);
  border-bottom: var(--about-rule);
  background: var(--ink-carbon);
  overflow: hidden;
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: clamp(210px, 40vw, 440px);
  object-fit: cover;
  filter: contrast(1.1) saturate(.85) brightness(.84);
}

.page-about .about-banner::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: repeating-linear-gradient(90deg, var(--red-track) 0 64px, transparent 64px 132px);
  opacity: .9;
}

/* ---------- 职能组 Tabs ---------- */
.page-about .about-teams {
  padding: 56px 0 8px;
}

.page-about .about-teams__head {
  margin-bottom: 30px;
}

.page-about .about-tabs {
  position: relative;
}

.page-about .about-tabs__ctrl {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.page-about .about-tabs__list {
  display: grid;
  grid-template-columns: 1fr;
  border-top: var(--about-rule);
}

.page-about .about-tab {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 18px;
  border-bottom: var(--about-rule);
  border-left: 4px solid transparent;
  cursor: pointer;
  font-weight: 800;
  font-size: 15px;
  letter-spacing: .01em;
  color: var(--mist-white);
  transition: background var(--t-fast) var(--ease-out), border-color var(--t-fast) var(--ease-out);
}

.page-about .about-tab:hover {
  background: var(--ink-carbon);
}

.page-about .about-tab__num {
  color: var(--steel-blue);
  font-size: 12px;
}

.page-about .about-tab__name {
  flex: 1 1 auto;
}

.page-about .about-tab__size {
  color: var(--steel-blue);
  font-size: 12px;
}

.page-about #t-data:checked ~ .about-tabs__list .about-tab:nth-of-type(1),
.page-about #t-video:checked ~ .about-tabs__list .about-tab:nth-of-type(2),
.page-about #t-edit:checked ~ .about-tabs__list .about-tab:nth-of-type(3),
.page-about #t-ops:checked ~ .about-tabs__list .about-tab:nth-of-type(4) {
  background: var(--ink-carbon);
  border-left-color: var(--red-track);
  box-shadow: inset 0 0 0 1px var(--ink-graphite);
}

.page-about #t-data:checked ~ .about-tabs__list .about-tab:nth-of-type(1) .about-tab__num,
.page-about #t-video:checked ~ .about-tabs__list .about-tab:nth-of-type(2) .about-tab__num,
.page-about #t-edit:checked ~ .about-tabs__list .about-tab:nth-of-type(3) .about-tab__num,
.page-about #t-ops:checked ~ .about-tabs__list .about-tab:nth-of-type(4) .about-tab__num {
  color: var(--cyan-neon);
}

.page-about .about-tabs__panels {
  border: var(--about-rule);
  border-top: 0;
  background: var(--ink-carbon);
}

.page-about .about-panel {
  display: none;
  padding: 26px 20px 28px;
  animation: about-panel-in var(--t-base) var(--ease-out) both;
}

.page-about #t-data:checked ~ .about-tabs__panels .about-panel:nth-of-type(1),
.page-about #t-video:checked ~ .about-tabs__panels .about-panel:nth-of-type(2),
.page-about #t-edit:checked ~ .about-tabs__panels .about-panel:nth-of-type(3),
.page-about #t-ops:checked ~ .about-tabs__panels .about-panel:nth-of-type(4) {
  display: block;
}

@keyframes about-panel-in {
  from { opacity: 0; transform: translateX(10px); }
  to { opacity: 1; transform: translateX(0); }
}

.page-about .about-panel__name {
  margin: 0 0 14px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--mist-white);
}

.page-about .about-panel__desc {
  margin: 0 0 22px;
  max-width: 68ch;
  color: var(--steel-blue);
  line-height: 1.8;
}

.page-about .about-panel__desc a {
  color: var(--cyan-neon);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-panel__facts {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px dashed var(--ink-graphite);
}

.page-about .about-fact {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px dashed var(--ink-graphite);
}

.page-about .about-fact dt {
  color: var(--steel-blue);
  font-size: 12px;
  letter-spacing: .08em;
}

.page-about .about-fact dd {
  margin: 0;
  color: var(--mist-white);
  font-size: 14px;
  line-height: 1.7;
}

/* ---------- 四步流程 ---------- */
.page-about .about-flow {
  padding: 60px 0 12px;
}

.page-about .about-flow__wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-steps {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--about-rule);
}

.page-about .about-step {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "num time"
    "body body";
  gap: 10px 14px;
  padding: 20px 0 22px;
  border-bottom: var(--about-rule);
}

.page-about .about-step__num {
  grid-area: num;
  color: var(--red-track);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
}

.page-about .about-step__time {
  grid-area: time;
  justify-self: end;
  color: var(--cyan-neon);
  font-size: 12px;
}

.page-about .about-step__body {
  grid-area: body;
}

.page-about .about-step__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  color: var(--mist-white);
}

.page-about .about-step__body p {
  margin: 0;
  max-width: 62ch;
  color: var(--steel-blue);
  font-size: 14px;
  line-height: 1.75;
}

.page-about .about-flow__figure {
  margin: 0;
  border: var(--about-rule);
  background: var(--ink-carbon);
  box-shadow: var(--shadow-hard);
  align-self: start;
}

.page-about .about-flow__figure img {
  display: block;
  width: 100%;
  height: clamp(200px, 46vw, 320px);
  object-fit: cover;
  filter: contrast(1.08) saturate(.8) brightness(.86);
}

.page-about .about-flow__figure figcaption {
  padding: 14px 16px;
  border-top: var(--about-rule);
  color: var(--steel-blue);
  font-size: 13px;
  line-height: 1.7;
}

/* ---------- 通栏数据带 ---------- */
.page-about .about-band {
  margin-top: 56px;
  padding: 38px 0 42px;
  background:
    linear-gradient(112deg, rgba(20, 26, 33, 1) 0%, rgba(20, 26, 33, 1) 62%, rgba(43, 51, 61, .9) 100%);
  border-top: var(--about-rule);
  border-bottom: var(--about-rule);
}

.page-about .about-band__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 26px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-band__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 14px;
  border-left: 3px solid var(--red-track);
}

.page-about .about-band__num {
  color: var(--cyan-neon);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.1;
}

.page-about .about-band__label {
  color: var(--steel-blue);
  font-size: 13px;
  line-height: 1.5;
}

/* ---------- 集锦标签 ---------- */
.page-about .about-clips {
  padding: 60px 0 12px;
}

.page-about .about-clips__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-clips__copy .h-2 {
  margin-bottom: 16px;
}

.page-about .about-clips__notes {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--about-rule);
}

.page-about .about-clips__notes li {
  padding: 13px 0;
  border-bottom: 1px dashed var(--ink-graphite);
  color: var(--steel-blue);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .about-clips__note-k {
  display: inline-block;
  min-width: 10ch;
  margin-right: 10px;
  color: var(--orange-electric);
  font-size: 13px;
}

.page-about .about-clips__tags {
  padding: 22px 20px 24px;
  border: var(--about-rule);
  background: var(--fog-light);
  color: var(--ink-void);
}

.page-about .about-clips__tags-title {
  margin: 0 0 16px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .1em;
  color: var(--ink-void);
}

.page-about .about-taglist {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
}

.page-about .about-tag {
  padding: 8px 14px;
  border: 2px solid var(--ink-void);
  background: transparent;
  color: var(--ink-void);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.2;
}

.page-about .about-tag--hot {
  background: var(--ink-void);
  color: var(--cyan-neon);
  box-shadow: 4px 4px 0 var(--red-track);
}

.page-about .about-clips__tags-note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: #3b454f;
}

.page-about .about-clips__tags-note a {
  color: var(--red-track);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 华南访问体验 ---------- */
.page-about .about-edge {
  padding: 60px 0 12px;
}

.page-about .about-edge__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-edge__copy .h-2 {
  margin-bottom: 16px;
}

.page-about .about-edge__list {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--about-rule);
}

.page-about .about-edge__list li {
  position: relative;
  padding: 14px 0 14px 22px;
  border-bottom: 1px dashed var(--ink-graphite);
  color: var(--mist-white);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .about-edge__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  width: 10px;
  height: 2px;
  background: var(--orange-electric);
}

.page-about .about-edge__more {
  margin: 20px 0 0;
  color: var(--steel-blue);
  font-size: 14px;
  line-height: 1.75;
}

.page-about .about-edge__more a {
  color: var(--cyan-neon);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-edge__figure {
  margin: 0;
  border: var(--about-rule);
  background: var(--ink-carbon);
  box-shadow: var(--shadow-hard);
  align-self: start;
}

.page-about .about-edge__figure img {
  display: block;
  width: 100%;
  height: clamp(200px, 44vw, 300px);
  object-fit: cover;
  filter: contrast(1.1) saturate(.75) brightness(.82);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  padding: 60px 0 12px;
}

.page-about .about-partners .section-head {
  margin-bottom: 30px;
}

.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .about-pcard {
  padding: 22px 20px 24px;
  border: var(--about-rule);
  background: var(--ink-carbon);
  box-shadow: var(--shadow-hard);
  transition: transform var(--t-fast) var(--ease-out), box-shadow var(--t-fast) var(--ease-out);
}

.page-about .about-pcard:hover {
  transform: translate(-3px, -3px);
  box-shadow: 9px 9px 0 var(--red-deep);
}

.page-about .about-pcard__num {
  display: block;
  margin-bottom: 12px;
  color: var(--red-track);
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
}

.page-about .about-pcard__title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 800;
  color: var(--mist-white);
}

.page-about .about-pcard p {
  margin: 0;
  color: var(--steel-blue);
  font-size: 14px;
  line-height: 1.75;
}

.page-about .about-partners__cta {
  margin: 26px 0 0;
  padding-top: 20px;
  border-top: var(--about-rule);
  color: var(--steel-blue);
  font-size: 14px;
  line-height: 1.75;
}

.page-about .about-partners__cta a {
  color: var(--cyan-neon);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 阶段时间线 ---------- */
.page-about .about-timeline {
  padding: 60px 0 12px;
}

.page-about .about-timeline .section-head {
  margin-bottom: 30px;
}

.page-about .about-tl {
  position: relative;
  margin: 0;
  padding: 0 0 0 28px;
  list-style: none;
  border-left: 2px solid var(--ink-graphite);
}

.page-about .about-tl__item {
  position: relative;
  margin-bottom: 18px;
}

.page-about .about-tl__item:last-child {
  margin-bottom: 0;
}

.page-about .about-tl__node {
  border: var(--about-rule);
  background: var(--ink-carbon);
}

.page-about .about-tl__summary {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-tl__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-tl__summary::marker {
  content: "";
}

.page-about .about-tl__dot {
  position: absolute;
  left: -38px;
  top: 22px;
  width: 12px;
  height: 12px;
  background: var(--red-track);
  border: 2px solid var(--ink-void);
  box-shadow: 0 0 0 2px var(--red-track);
}

.page-about .about-tl__stage {
  flex: 1 1 auto;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--mist-white);
}

.page-about .about-tl__hint {
  color: var(--steel-blue);
  font-size: 12px;
}

.page-about .about-tl__chev {
  color: var(--cyan-neon);
  font-size: 18px;
  line-height: 1;
  transition: transform var(--t-fast) var(--ease-out);
}

.page-about .about-tl__node[open] .about-tl__chev {
  transform: rotate(45deg);
}

.page-about .about-tl__body {
  padding: 0 18px 20px;
  border-top: 1px dashed var(--ink-graphite);
}

.page-about .about-tl__body p {
  margin: 16px 0 0;
  max-width: 64ch;
  color: var(--steel-blue);
  font-size: 14px;
  line-height: 1.78;
}

.page-about .about-tl__list {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tl__list li {
  position: relative;
  padding: 7px 0 7px 18px;
  color: var(--mist-white);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .about-tl__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 15px;
  width: 8px;
  height: 2px;
  background: var(--orange-electric);
}

/* ---------- 收尾 ---------- */
.page-about .about-next {
  padding: 60px 0 72px;
}

.page-about .about-next__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  padding: 30px 22px 32px;
  border: var(--about-rule);
  background: var(--ink-carbon);
  box-shadow: var(--shadow-hard);
}

.page-about .about-next__copy h2 {
  margin: 0 0 12px;
}

.page-about .about-next__copy p {
  margin: 0;
  max-width: 56ch;
  color: var(--steel-blue);
  font-size: 14px;
  line-height: 1.75;
}

.page-about .about-next__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-start;
}

/* ---------- 中屏 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero {
    padding: 52px 0 44px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    gap: 40px;
  }

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

  .page-about .about-stat {
    border-bottom: 0;
    border-right: var(--about-rule);
    padding: 22px 18px;
  }

  .page-about .about-stat:last-child {
    border-right: 0;
  }

  .page-about .about-tabs__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    border-left: var(--about-rule);
  }

  .page-about .about-tab {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 18px 16px;
    border-bottom: 0;
    border-right: var(--about-rule);
    border-left: 0;
    border-top: 4px solid transparent;
  }

  .page-about .about-tab__size {
    margin-top: 4px;
  }

  .page-about #t-data:checked ~ .about-tabs__list .about-tab:nth-of-type(1),
  .page-about #t-video:checked ~ .about-tabs__list .about-tab:nth-of-type(2),
  .page-about #t-edit:checked ~ .about-tabs__list .about-tab:nth-of-type(3),
  .page-about #t-ops:checked ~ .about-tabs__list .about-tab:nth-of-type(4) {
    border-left: 0;
    border-top-color: var(--red-track);
  }

  .page-about .about-panel {
    padding: 30px 26px 34px;
  }

  .page-about .about-fact {
    grid-template-columns: 14ch 1fr;
    gap: 18px;
    align-items: baseline;
  }

  .page-about .about-flow__wrap {
    grid-template-columns: 8fr 4fr;
    gap: 36px;
  }

  .page-about .about-step {
    grid-template-columns: 4ch 1fr 12ch;
    grid-template-areas: "num .page-about time";
    align-items: baseline;
    gap: 20px;
    padding: 22px 0;
  }

  .page-about .about-step__time {
    justify-self: end;
    text-align: right;
  }

  .page-about .about-band__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .about-clips__grid {
    grid-template-columns: 7fr 5fr;
    gap: 36px;
    align-items: start;
  }

  .page-about .about-edge__grid {
    grid-template-columns: 7fr 5fr;
    gap: 36px;
  }

  .page-about .about-partners__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .about-partners__grid .about-pcard:nth-child(2) {
    transform: translateY(16px);
  }

  .page-about .about-partners__grid .about-pcard:nth-child(3) {
    transform: translateY(32px);
  }

  .page-about .about-tl {
    padding-left: 34px;
  }

  .page-about .about-tl__dot {
    left: -44px;
  }

  .page-about .about-next__inner {
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 32px;
    padding: 38px 34px 40px;
  }

  .page-about .about-next__acts {
    justify-content: flex-end;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1080px) {
  .page-about .about-teams,
  .page-about .about-clips,
  .page-about .about-edge,
  .page-about .about-partners,
  .page-about .about-timeline {
    padding-top: 76px;
  }

  .page-about .about-flow {
    padding-top: 76px;
  }

  .page-about .about-band {
    margin-top: 72px;
    padding: 48px 0 52px;
  }

  .page-about .about-band__num {
    font-size: 32px;
  }

  .page-about .about-next {
    padding: 76px 0 92px;
  }

  .page-about .about-panel__desc,
  .page-about .about-clips__copy .prose,
  .page-about .about-edge__copy .prose {
    font-size: 15px;
  }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-panel {
    animation: none;
  }

  .page-about .about-pcard,
  .page-about .about-tl__chev,
  .page-about .about-tab {
    transition: none;
  }

  .page-about .about-pcard:hover,
  .page-about .about-partners__grid .about-pcard:nth-child(2),
  .page-about .about-partners__grid .about-pcard:nth-child(3) {
    transform: none;
  }
}