.page-about {
  --about-note-col: 0px;
  --about-aside-col: 0px;
  --about-gap: 28px;
}

.page-about .breadcrumb {
  padding-top: 24px;
  font-size: 13px;
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  color: var(--graphite);
  font-family: var(--font-mono);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-about .breadcrumb a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 160ms ease, color 160ms ease;
}

.page-about .breadcrumb a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 40px 0 8px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 40px;
}

.page-about .about-hero h1 {
  margin: 16px 0 20px;
  font-size: clamp(32px, 8vw, 60px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--sand);
  max-width: 16em;
}

.page-about .about-hero .lede {
  max-width: 34em;
  color: var(--sand);
  opacity: 0.86;
  font-size: 17px;
  line-height: 1.75;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 32px;
  border-top: 1px solid var(--line);
  padding-top: 22px;
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 7vw, 44px);
  line-height: 1;
  color: var(--amber);
  letter-spacing: -0.03em;
}

.page-about .about-fact__key {
  font-size: 13px;
  line-height: 1.5;
  color: var(--graphite);
}

.page-about .about-hero__visual {
  position: relative;
  background: linear-gradient(160deg, rgba(51, 225, 214, 0.08), rgba(255, 138, 30, 0.06) 60%, transparent);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
}

.page-about .about-hero__svg {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-chapter__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
  border-left: 2px solid var(--cyan-dark);
  padding-left: 10px;
}

.page-about .about-chapter h2 {
  margin: 0 0 18px;
  font-size: clamp(24px, 6vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--sand);
}

.page-about .about-chapter h3 {
  margin: 0 0 8px;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--sand);
}

.page-about .about-chapter .prose + .prose {
  margin-top: 16px;
}

.page-about .about-chapter__aside {
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.page-about .about-chapter__aside .sidenote {
  margin: 0;
  color: var(--graphite);
  font-size: 13px;
  line-height: 1.7;
}

/* ---------- 日常职责 ---------- */
.page-about .about-duties {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-duties__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: start;
  gap: 14px;
  padding: 16px 18px;
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .about-duties__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--sand);
  opacity: 0.88;
}

.page-about .about-duties__tag {
  white-space: nowrap;
}

/* ---------- 团队切换面板 ---------- */
.page-about .about-team {
  margin-top: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-team__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .about-team__labels {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  background: var(--charcoal);
  border-bottom: 1px solid var(--line);
}

.page-about .about-team__tab {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 14px;
  cursor: pointer;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  transition: background 160ms ease, box-shadow 160ms ease;
}

.page-about .about-team__tab:hover {
  background: rgba(255, 255, 255, 0.04);
}

.page-about .about-team__count {
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  color: var(--graphite);
  transition: color 160ms ease;
}

.page-about .about-team__name {
  font-size: 14px;
  color: var(--sand);
}

.page-about .about-team__hint {
  font-size: 12px;
  color: var(--graphite);
}

.page-about #team-tech:checked ~ .about-team__labels label[for="team-tech"],
.page-about #team-edit:checked ~ .about-team__labels label[for="team-edit"],
.page-about #team-qc:checked ~ .about-team__labels label[for="team-qc"],
.page-about #team-ops:checked ~ .about-team__labels label[for="team-ops"] {
  background: rgba(255, 138, 30, 0.12);
  box-shadow: inset 0 -2px 0 0 var(--amber);
}

.page-about #team-tech:checked ~ .about-team__labels label[for="team-tech"] .about-team__count,
.page-about #team-edit:checked ~ .about-team__labels label[for="team-edit"] .about-team__count,
.page-about #team-qc:checked ~ .about-team__labels label[for="team-qc"] .about-team__count,
.page-about #team-ops:checked ~ .about-team__labels label[for="team-ops"] .about-team__count {
  color: var(--amber);
}

.page-about .about-team__panel {
  display: none;
  padding: 22px 20px 24px;
}

.page-about .about-team__panel p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--sand);
  opacity: 0.86;
}

.page-about .about-team__panel ul {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 7px;
}

.page-about .about-team__panel li {
  font-size: 14px;
  line-height: 1.65;
  color: var(--graphite);
}

.page-about #team-tech:checked ~ .about-team__panels #panel-tech,
.page-about #team-edit:checked ~ .about-team__panels #panel-edit,
.page-about #team-qc:checked ~ .about-team__panels #panel-qc,
.page-about #team-ops:checked ~ .about-team__panels #panel-ops {
  display: block;
}

.page-about .about-team__radio:focus-visible + .about-team__radio + .about-team__radio + .about-team__radio + .about-team__labels {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 30px 0 0;
  padding: 0 0 0 22px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 12px;
  width: 1px;
  background: var(--line);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 28px 0;
}

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

.page-about .about-timeline__dot {
  position: absolute;
  left: -22px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--obsidian);
  border: 2px solid var(--cyan);
  transition: background 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.page-about .about-timeline__item:hover .about-timeline__dot {
  background: var(--cyan);
  transform: scale(1.15);
}

.page-about .about-timeline__round {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .about-timeline__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--sand);
  opacity: 0.84;
}

.page-about .about-timeline__kw {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 0;
  padding: 0;
}

.page-about .about-timeline__kw li {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  border: 1px solid var(--cyan-dark);
  border-radius: var(--radius);
  padding: 3px 9px;
  transition: border-color 160ms ease, color 160ms ease, background 160ms ease;
}

.page-about .about-timeline__item:hover .about-timeline__kw li {
  border-color: var(--amber);
  color: var(--amber);
  background: rgba(255, 138, 30, 0.08);
}

/* ---------- 整理流程 ---------- */
.page-about .about-flow {
  margin: 28px 0 26px;
  padding: 0;
  border: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-flow__step {
  background: var(--charcoal);
  padding: 20px 18px;
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
}

.page-about .about-flow__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  color: var(--amber);
  margin-bottom: 10px;
}

/* ---------- 折叠说明 ---------- */
.page-about .about-details {
  margin-top: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--glass);
}

.page-about .about-details summary {
  cursor: pointer;
  padding: 15px 18px;
  font-size: 15px;
  color: var(--sand);
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

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

.page-about .about-details summary::after {
  content: "+";
  font-family: var(--font-mono);
  color: var(--cyan);
  font-size: 18px;
  line-height: 1;
}

.page-about .about-details[open] summary::after {
  content: "–";
  color: var(--amber);
}

.page-about .about-details__body {
  padding: 0 18px 18px;
  border-top: 1px solid var(--line);
}

.page-about .about-details__body ul {
  margin: 16px 0 0;
  padding-left: 18px;
  display: grid;
  gap: 8px;
}

.page-about .about-details__body li {
  font-size: 14px;
  line-height: 1.7;
  color: var(--sand);
  opacity: 0.85;
}

.page-about .about-details__body p {
  margin: 14px 0 0;
}

/* ---------- 资质与保障 ---------- */
.page-about .about-assurance {
  display: grid;
  gap: 14px;
  margin: 26px 0 24px;
}

.page-about .about-assurance__cell {
  padding: 18px;
  border-radius: var(--radius);
}

.page-about .about-assurance__value {
  margin: 10px 0 8px;
  font-family: var(--font-mono);
  font-size: 19px;
  line-height: 1.4;
  color: var(--sand);
}

.page-about .about-assurance__cell .sidenote {
  margin: 0;
}

/* ---------- 图注 ---------- */
.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  padding-bottom: 72px;
}

.page-about .about-cta__inner {
  display: grid;
  gap: 22px;
  padding: 28px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(255, 138, 30, 0.10), rgba(51, 225, 214, 0.06));
}

.page-about .about-cta h2 {
  margin: 0 0 10px;
  font-size: clamp(21px, 5vw, 30px);
  letter-spacing: -0.02em;
  color: var(--sand);
}

.page-about .about-cta p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--graphite);
  max-width: 40em;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-team__labels {
    grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  }

  .page-about .about-team__tab {
    border-bottom: 0;
    border-right: 1px solid var(--line);
    padding: 18px 16px;
  }

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

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

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

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    align-items: center;
    padding: 36px 32px;
  }
}

@media (min-width: 960px) {
  .page-about {
    --about-note-col: 58px;
    --about-aside-col: 240px;
    --about-gap: 40px;
  }

  .page-about .about-hero {
    padding: 64px 0 24px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: center;
    gap: 48px;
  }

  .page-about .about-hero__visual {
    clip-path: polygon(0 0, 100% 0, 100% 92%, 0 100%);
    padding: 24px 24px 40px;
  }

  .page-about .about-chapter__grid {
    grid-template-columns: var(--about-note-col) minmax(0, 1fr) var(--about-aside-col);
    align-items: start;
  }

  .page-about .about-chapter__note {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    border-left: 0;
    border-top: 2px solid var(--cyan-dark);
    padding: 12px 0 0;
    letter-spacing: 0.24em;
    justify-self: start;
  }

  .page-about .about-chapter__aside {
    border-top: 0;
    border-left: 1px solid var(--line);
    padding-top: 0;
    padding-left: 22px;
    position: sticky;
    top: 32px;
  }
}

@media (min-width: 1200px) {
  .page-about {
    --about-aside-col: 288px;
  }

  .page-about .about-chapter__grid {
    gap: 56px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
  }
}