.page-about {
  --about-section-pad: clamp(56px, 9vw, 120px);
  background: var(--night);
  color: var(--bone);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .band--bone {
  color: var(--ink);
}

/* 首屏 */
.page-about .about-hero-band {
  padding-block: clamp(24px, 4vw, 48px) clamp(48px, 8vw, 100px);
}

.page-about .breadcrumb {
  margin-bottom: clamp(28px, 4vw, 52px);
}

.page-about .about-hero {
  display: grid;
  gap: clamp(36px, 6vw, 64px);
  align-items: center;
}

.page-about .about-title {
  margin: 14px 0 0;
  font-size: clamp(42px, 8.5vw, 78px);
  line-height: 0.95;
  letter-spacing: -0.025em;
}

.page-about .about-hero .lead {
  margin-top: clamp(18px, 2.4vw, 28px);
  max-width: 36ch;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 38px);
}

/* 同心轨道 */
.page-about .orbit {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}

.page-about .orbit svg {
  display: block;
  width: 100%;
  max-width: 420px;
  height: auto;
  margin-inline: auto;
  overflow: visible;
}

.page-about .orbit-axis {
  fill: none;
  stroke: var(--line);
  stroke-width: 1;
  stroke-dasharray: 3 9;
}

.page-about .orbit-layer circle {
  fill: none;
  stroke-linecap: round;
  transition: stroke-width 0.3s var(--ease), opacity 0.3s var(--ease);
}

.page-about .orbit-layer--cat circle {
  stroke: var(--pitch);
  stroke-width: 13;
  stroke-dasharray: 790 278;
}

.page-about .orbit-layer--team circle {
  stroke: var(--mint);
  stroke-width: 10;
  stroke-dasharray: 566 201;
}

.page-about .orbit-layer--squad circle {
  stroke: var(--flare);
  stroke-width: 8;
  stroke-dasharray: 352 126;
}

.page-about .orbit-core-num {
  fill: var(--flare);
  font-family: var(--mono);
  font-size: 56px;
  font-weight: 700;
  dominant-baseline: middle;
}

.page-about .orbit-core-label {
  fill: var(--mist);
  font-size: 13px;
  letter-spacing: 0.14em;
}

.page-about .orbit-notes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
}

.page-about .orbit-note {
  display: grid;
  grid-template-columns: 10px 1fr;
  gap: 4px 10px;
  align-items: center;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 2px;
  transition: border-color 0.3s var(--ease), background-color 0.3s var(--ease);
}

.page-about .orbit-note strong {
  font-size: 14px;
  font-weight: 600;
}

.page-about .orbit-note span:not(.orbit-dot) {
  grid-column: 2;
  font-size: 12px;
  color: var(--mist);
}

.page-about .orbit-dot {
  grid-row: span 2;
  width: 10px;
  height: 10px;
  align-self: center;
}

.page-about .orbit-dot--cat { background: var(--pitch); }
.page-about .orbit-dot--team { background: var(--mint); }
.page-about .orbit-dot--squad { background: var(--flare); }

.page-about .orbit:has(.orbit-note--cat:hover) .orbit-layer--cat circle { stroke-width: 21; }
.page-about .orbit:has(.orbit-note--team:hover) .orbit-layer--team circle { stroke-width: 18; }
.page-about .orbit:has(.orbit-note--squad:hover) .orbit-layer--squad circle { stroke-width: 15; }

.page-about .orbit-note:hover {
  border-color: var(--line-strong);
  background: rgba(46, 139, 87, 0.1);
}

@media (min-width: 920px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
}

/* 引述 */
.page-about .about-quote-band {
  padding-block: clamp(48px, 8vw, 100px);
}

.page-about .pull-quote {
  display: grid;
  gap: 18px;
}

.page-about .pull-quote-text {
  margin: 0;
  color: var(--ink);
  font-size: clamp(30px, 6.4vw, 66px);
  font-weight: 300;
  line-height: 1.08;
  letter-spacing: -0.025em;
}

.page-about .pull-quote-index {
  margin: 0;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: rgba(11, 11, 14, 0.62);
}

@media (min-width: 860px) {
  .page-about .pull-quote {
    grid-template-columns: minmax(0, 1fr) 220px;
    align-items: end;
    gap: 40px;
  }
}

/* 通用章节 */
.page-about .about-section {
  padding-block: var(--about-section-pad);
}

.page-about .about-section .section-head {
  margin-bottom: clamp(24px, 3.5vw, 44px);
}

/* 为什么做成轨道 */
.page-about .why-grid {
  align-items: start;
}

.page-about .why-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .why-item {
  padding-left: 16px;
  border-left: 2px solid var(--flare);
}

.page-about .why-item strong {
  display: block;
  font-size: 17px;
  margin-bottom: 4px;
}

.page-about .why-item span {
  font-size: 14px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .why-link {
  display: inline-block;
  margin-top: clamp(22px, 3vw, 32px);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 4px;
}

.page-about .why-link:hover {
  color: var(--flare);
  border-bottom-color: var(--flare);
}

/* 团队 */
.page-about .crew-figure {
  margin: 0 0 clamp(26px, 3.5vw, 40px);
}

.page-about .crew-grid {
  display: grid;
  gap: 18px;
}

.page-about .crew-card {
  padding: clamp(18px, 2.4vw, 28px);
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .crew-tag {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--flare);
}

.page-about .crew-card h3 {
  margin: 0;
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.3;
}

.page-about .crew-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
}

@media (min-width: 780px) {
  .page-about .crew-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* 名单流程 */
.page-about .flow-grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .flow {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .flow-step {
  position: relative;
  border: 1px solid var(--line);
  background: rgba(10, 22, 34, 0.5);
  padding: 16px 18px;
}

.page-about .flow-step + .flow-step::before {
  content: "";
  position: absolute;
  left: 30px;
  top: -14px;
  width: 1px;
  height: 14px;
  background: var(--flare);
  transform: rotate(6deg);
  transform-origin: bottom center;
}

.page-about .flow-step summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 14px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .flow-num {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--flare);
}

.page-about .flow-title {
  font-size: clamp(16px, 1.8vw, 19px);
  font-weight: 600;
}

.page-about .flow-mark {
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--mint);
  border-bottom: 2px solid var(--mint);
  transform: rotate(45deg);
  transition: transform 0.3s var(--ease);
}

.page-about .flow-step[open] .flow-mark {
  transform: rotate(-135deg);
}

.page-about .flow-step[open] {
  border-color: var(--line-strong);
}

.page-about .flow-body {
  padding-top: 12px;
}

.page-about .flow-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .flow-figure {
  margin: 0;
  align-self: start;
}

@media (min-width: 900px) {
  .page-about .flow-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

/* 费用周期 */
.page-about .cycle-lead {
  max-width: 46ch;
  margin: 0 0 clamp(24px, 3vw, 36px);
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .cycle-grid {
  display: grid;
  gap: 18px;
}

.page-about .cycle-card {
  padding: clamp(20px, 3vw, 32px);
  display: grid;
  gap: 14px;
  align-content: start;
  border: 1px solid var(--line);
}

.page-about .cycle-card--month {
  background: linear-gradient(160deg, rgba(46, 139, 87, 0.22), rgba(10, 22, 34, 0.4));
}

.page-about .cycle-card--season {
  background: linear-gradient(160deg, rgba(92, 31, 61, 0.55), rgba(38, 34, 79, 0.45));
}

.page-about .cycle-card h3 {
  margin: 0;
  font-size: clamp(20px, 2.4vw, 26px);
  line-height: 1.24;
}

.page-about .cycle-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--bone);
  opacity: 0.86;
}

.page-about .cycle-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
  font-size: 14px;
  color: var(--mist);
}

.page-about .cycle-points li {
  position: relative;
  padding-left: 18px;
}

.page-about .cycle-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 9px;
  height: 2px;
  background: var(--mint);
}

.page-about .cycle-note {
  max-width: 52ch;
  margin: clamp(24px, 3vw, 34px) 0 clamp(22px, 3vw, 30px);
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

@media (min-width: 780px) {
  .page-about .cycle-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }
}

/* 时间线 */
.page-about .timeline {
  display: grid;
  gap: 22px;
}

.page-about .timeline-rail-title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mist);
}

.page-about .timeline-rail ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}

.page-about .timeline-rail li {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .timeline-rail li.is-current {
  color: var(--flare);
}

.page-about .timeline-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.6vw, 28px);
}

.page-about .timeline-card {
  background: rgba(10, 22, 34, 0.46);
  border-left: 2px solid var(--flare);
  padding: clamp(18px, 2.6vw, 26px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-about .timeline-year {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .timeline-card h3 {
  margin: 0 0 8px;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.32;
}

.page-about .timeline-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

@media (min-width: 880px) {
  .page-about .timeline {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 0 clamp(28px, 4vw, 60px);
  }

  .page-about .timeline-rail {
    position: sticky;
    top: 110px;
    align-self: start;
  }

  .page-about .timeline-rail ol {
    flex-direction: column;
    gap: 20px;
  }

  .page-about .timeline-item:nth-child(odd) .timeline-card {
    width: 80%;
  }

  .page-about .timeline-item:nth-child(even) .timeline-card {
    width: 100%;
    margin-left: auto;
  }
}

@supports (animation-timeline: view()) {
  @media (prefers-reduced-motion: no-preference) {
    .page-about .timeline-item {
      animation: about-tl-focus linear both;
      animation-timeline: view();
      animation-range: entry 12% cover 62%;
    }
  }
}

@keyframes about-tl-focus {
  from { opacity: 0.55; }
  to { opacity: 1; }
}

/* 覆盖与合作 */
.page-about .coverage-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .coverage-cell {
  background: rgba(10, 22, 34, 0.72);
  padding: clamp(20px, 2.6vw, 30px);
  display: grid;
  gap: 10px;
  align-content: start;
}

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

.page-about .coverage-note {
  margin: clamp(24px, 3vw, 34px) 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .coverage-note a {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
}

.page-about .coverage-note a:hover {
  color: var(--flare);
  border-bottom-color: var(--flare);
}

@media (min-width: 700px) {
  .page-about .coverage-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-about .coverage-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* 收尾 */
.page-about .about-closing {
  padding-block: clamp(48px, 7vw, 96px) clamp(56px, 8vw, 112px);
}

.page-about .closing-grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: center;
}

.page-about .closing-figure {
  margin: 0;
}

.page-about .closing-title {
  margin: 12px 0 16px;
  font-size: clamp(26px, 4.4vw, 44px);
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.page-about .closing-copy p {
  margin: 0;
  max-width: 40ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .closing-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

@media (min-width: 900px) {
  .page-about .closing-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .orbit-layer circle,
  .page-about .orbit-note,
  .page-about .flow-mark {
    transition: none;
  }
}