.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: var(--space-3) 0 var(--space-2);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--ink-50);
}

.page-about .breadcrumb a {
  color: var(--ink-70);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  color: var(--ochre);
}

/* 季节色协议：在页面作用域内绑定四条季节线的颜色变量 */
.page-about .season-spring {
  --season: var(--barley);
  --season-soft: rgba(127, 176, 105, .18);
}

.page-about .season-summer {
  --season: var(--glacier);
  --season-soft: rgba(47, 127, 158, .16);
}

.page-about .season-autumn {
  --season: var(--amber);
  --season-soft: rgba(224, 123, 57, .16);
}

.page-about .season-winter {
  --season: var(--indigo);
  --season-soft: rgba(27, 42, 73, .14);
}

/* 首屏 */
.page-about .about-hero {
  display: grid;
  gap: var(--space-3);
  padding: var(--space-2) 0 var(--space-5);
}

.page-about .about-hero h1 {
  margin: 0;
  max-width: 18ch;
}

.page-about .about-lede {
  margin: 0;
  max-width: var(--max-read);
  font-size: 18px;
  line-height: 1.75;
  color: var(--ink-70);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2) var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--line);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-stat-num {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat-label {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--ink-50);
}

/* 通栏画面 */
.page-about .about-banner {
  margin: 0 0 var(--space-6);
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  border-radius: var(--radius-l);
}

.page-about .about-banner figcaption {
  margin-top: var(--space-2);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--ink-50);
}

/* 章节骨架 */
.page-about .about-section {
  padding: var(--space-6) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-section-head {
  margin-bottom: var(--space-4);
}

.page-about .about-section-head h2 {
  margin: 8px 0 0;
  max-width: 22ch;
}

/* 四季分栏 */
.page-about .about-two-col {
  display: grid;
  gap: var(--space-3);
}

.page-about .about-note {
  margin: 0;
  max-width: 26ch;
  padding-left: var(--space-2);
  border-left: 2px solid var(--gold);
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-70);
}

.page-about .about-seasons {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
}

.page-about .about-seasons li {
  position: relative;
  display: grid;
  gap: 2px;
  padding: var(--space-2) 0 var(--space-2) 22px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-seasons li:first-child {
  border-top: 1px solid var(--line);
}

.page-about .about-seasons li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: calc(var(--space-2) + 7px);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--season, var(--ink));
}

.page-about .about-season-name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-season-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-50);
}

/* 版本时间轴 */
.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: var(--space-4);
  padding-left: 30px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--barley), var(--glacier) 36%, var(--amber) 68%, var(--indigo));
}

.page-about .about-stage {
  position: relative;
  display: grid;
  gap: var(--space-2);
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--season, var(--ink));
  box-shadow: 0 0 0 4px var(--season-soft, rgba(16, 20, 24, .08));
}

.page-about .about-stage-head {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.page-about .about-stage-head h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .about-stage-ver {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: var(--season-soft, rgba(16, 20, 24, .06));
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--ink);
}

.page-about .about-stage-ver::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--season, var(--ink));
}

.page-about .about-stage-sum {
  margin: 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-70);
}

/* 展开控件 */
.page-about .about-stage-toggle {
  justify-self: start;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  background: transparent;
  font: inherit;
  font-size: 14px;
  color: var(--ink);
  cursor: pointer;
  transition: border-color .18s ease, color .18s ease;
}

.page-about .about-stage-toggle:hover,
.page-about .about-stage-toggle:focus-visible {
  border-color: var(--ochre);
  color: var(--ochre);
  outline: none;
}

.page-about .about-role-cue {
  display: inline-flex;
  color: var(--ink-50);
}

.page-about .about-role-cue::before {
  content: "＋";
  font-size: 13px;
  line-height: 1;
}

.page-about [data-disclosure-toggle][aria-expanded="true"] .about-role-cue::before {
  content: "－";
}

.page-about .about-stage-body,
.page-about .about-role-body {
  max-width: var(--max-read);
  padding-top: var(--space-2);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-70);
}

.page-about .about-stage-body p,
.page-about .about-role-body p {
  margin: 0 0 var(--space-2);
}

.page-about .about-stage-body p:last-child,
.page-about .about-role-body p:last-child {
  margin-bottom: 0;
}

/* 跨栏引文 */
.page-about .about-quote {
  margin: var(--space-6) 0;
  padding: var(--space-2) 0 var(--space-2) var(--space-3);
  border-left: 3px solid var(--gold);
  animation: about-quote-in .9s ease both;
}

.page-about .about-quote p {
  margin: 0;
  max-width: 26ch;
  font-family: var(--font-display);
  font-size: clamp(22px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: -.01em;
  color: var(--ink);
}

@keyframes about-quote-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-quote {
    animation: none;
  }
}

/* 团队 */
.page-about .about-team-grid {
  display: grid;
  gap: var(--space-4);
}

.page-about .about-team-media,
.page-about .about-source-media {
  margin: 0;
}

.page-about .about-team-media img,
.page-about .about-source-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-m);
}

.page-about .about-team-media figcaption,
.page-about .about-source-media figcaption {
  margin-top: var(--space-2);
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-50);
}

.page-about .about-team-body > p {
  margin: 0 0 var(--space-3);
  max-width: var(--max-read);
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink-70);
}

.page-about .about-roles {
  display: grid;
  gap: var(--space-2);
}

.page-about .about-role {
  border-bottom: 1px solid var(--line);
}

.page-about .about-role-trigger {
  display: grid;
  gap: 10px;
  width: 100%;
  padding: var(--space-2) 0;
  border: 0;
  background: none;
  font: inherit;
  text-align: left;
  color: var(--ink);
  cursor: pointer;
}

.page-about .about-role-trigger:focus-visible {
  outline: 2px solid var(--ochre);
  outline-offset: 3px;
}

.page-about .about-role-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-role-name {
  margin-right: auto;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-role-num {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--ink-70);
  font-variant-numeric: tabular-nums;
}

.page-about .about-role-bar {
  display: block;
  height: 8px;
  border-radius: var(--radius-pill);
  background: rgba(16, 20, 24, .08);
  overflow: hidden;
}

.page-about .about-role-fill {
  display: block;
  height: 100%;
  border-radius: var(--radius-pill);
  background: var(--season, var(--ochre));
}

.page-about .about-role--edit .about-role-fill {
  width: 42.8%;
}

.page-about .about-role--build .about-role-fill {
  width: 28.6%;
}

.page-about .about-role--care .about-role-fill {
  width: 28.6%;
}

/* 风物取材 */
.page-about .about-source {
  position: relative;
  overflow: hidden;
}

.page-about .about-source-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--space-4);
}

.page-about .about-source-media img {
  object-position: 62% 50%;
}

.page-about .about-contour {
  position: absolute;
  right: -12%;
  bottom: -6%;
  width: 70%;
  max-width: 620px;
  height: auto;
  opacity: .38;
  pointer-events: none;
}

.page-about .about-contour path {
  fill: none;
  stroke: var(--glacier);
  stroke-width: 1.2;
}

/* 合作与认可 */
.page-about .about-honor {
  display: grid;
  gap: var(--space-4);
}

.page-about .about-honor-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-honor-list li {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: var(--space-2);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-honor-list li:first-child {
  border-top: 1px solid var(--line);
}

.page-about .about-honor-year {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--ochre);
}

.page-about .about-honor-text {
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-honor-note p {
  margin: 0 0 var(--space-2);
}

.page-about .about-honor-note p:last-child {
  margin-bottom: 0;
}

/* 日常状态 */
.page-about .about-rhythm {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-3);
}

.page-about .about-rhythm-item {
  display: grid;
  gap: 6px;
  padding-top: var(--space-2);
  border-top: 3px solid var(--season, var(--line-strong));
}

.page-about .about-rhythm-num {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.page-about .about-rhythm-label {
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--ink-50);
}

.page-about .about-rhythm-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-70);
}

.page-about .about-rhythm-note {
  margin: var(--space-4) 0 0;
}

/* 收尾 */
.page-about .about-cta {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-6);
  padding: var(--space-5) var(--space-4);
  border-radius: var(--radius-l);
  background: linear-gradient(135deg, rgba(228, 179, 99, .26), rgba(127, 176, 105, .16) 42%, rgba(47, 127, 158, .18) 72%, rgba(27, 42, 73, .14));
}

.page-about .about-cta h2 {
  margin: 0;
  max-width: 20ch;
}

.page-about .about-cta p {
  margin: 0;
  max-width: var(--max-read);
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink-70);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.page-about .about-cta-copy {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
}

/* 平板与桌面 */
@media (min-width: 768px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-seasons {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: var(--space-4);
  }

  .page-about .about-seasons li:nth-child(2) {
    border-top: 1px solid var(--line);
  }

  .page-about .about-cta {
    padding: var(--space-6) var(--space-5);
  }
}

@media (min-width: 900px) {
  .page-about .about-two-col {
    grid-template-columns: 3fr 8fr 1fr;
    gap: var(--space-4);
  }

  .page-about .about-two-col .about-note {
    grid-column: 1;
  }

  .page-about .about-two-col .prose {
    grid-column: 2;
  }

  .page-about .about-team-grid {
    grid-template-columns: 5fr 7fr;
    gap: var(--space-5);
    align-items: start;
  }

  .page-about .about-source-grid {
    grid-template-columns: 7fr 5fr;
    gap: var(--space-5);
    align-items: start;
  }

  .page-about .about-honor {
    grid-template-columns: 7fr 5fr;
    gap: var(--space-5);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-timeline {
    padding-left: 68px;
    gap: var(--space-5);
  }

  .page-about .about-timeline::before {
    left: 20px;
  }

  .page-about .about-stage::before {
    left: -54px;
    top: 8px;
  }

  .page-about .about-stage:nth-child(odd) {
    padding-right: 14%;
  }

  .page-about .about-stage:nth-child(even) {
    padding-left: 10%;
  }

  .page-about .about-quote {
    margin: var(--space-7) 0;
  }
}