.page-about {
  --about-rail-w: 268px;
  --about-flow: clamp(48px, 6vw, 84px);
  background: var(--paper);
  color: var(--ink);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}
.page-about .about-crumb a {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 1px;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.page-about .about-crumb a:hover {
  color: var(--seal);
  border-bottom-color: var(--seal);
}
.page-about .about-crumb__sep { color: var(--line); }
.page-about .about-crumb__now { color: var(--ink); }

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-bottom: clamp(32px, 5vw, 60px);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: 0;
  top: -18%;
  right: -14%;
  width: min(64%, 720px);
  height: 140%;
  background: var(--season);
  opacity: 0.18;
  clip-path: polygon(32% 0%, 100% 0%, 100% 100%, 0% 100%);
  pointer-events: none;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: 0;
  right: 6%;
  bottom: 10%;
  width: 92px;
  height: 92px;
  border: 2px solid var(--seal);
  transform: rotate(12deg);
  opacity: 0.45;
  pointer-events: none;
}
.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
  align-items: start;
  margin-top: clamp(22px, 3vw, 40px);
}
.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 5.2vw, 56px);
  line-height: 1.2;
  letter-spacing: -0.01em;
}
.page-about .about-hero__intro {
  margin: 20px 0 0;
  max-width: 36em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink-soft);
}
.page-about .about-hero__actions { margin-top: 28px; }

.page-about .about-hero__side {
  display: flex;
  flex-direction: column;
  gap: 24px;
  align-items: flex-start;
}
.page-about .about-hero__seal {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.22em;
  padding: 14px 10px;
  background: var(--seal);
  color: var(--paper);
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-soft);
  transform: rotate(-2deg);
  transition: transform 0.22s ease, box-shadow 0.22s ease;
}
.page-about .about-hero__seal:hover {
  transform: rotate(1.5deg);
  box-shadow: var(--shadow-hard);
}
.page-about .about-facts {
  width: 100%;
  margin: 0;
  border-top: 2px solid var(--ink);
}
.page-about .about-facts__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 14px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}
.page-about .about-facts dt {
  font-size: 13.5px;
  color: var(--ink-soft);
  white-space: nowrap;
}
.page-about .about-facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  text-align: right;
}

/* ---------- 主体双栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4.5vw, 56px);
  align-items: start;
  margin-top: clamp(40px, 6vw, 78px);
  margin-bottom: clamp(48px, 7vw, 96px);
}
.page-about .about-rail {
  display: flex;
  flex-direction: column;
  gap: 32px;
}
.page-about .rail-block {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.page-about .rail-block__title {
  margin: 0;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
}

/* 年份索引 */
.page-about .year-index {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .year-index__link {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 9px 4px 9px 12px;
  border-left: 2px solid transparent;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.18s ease, background 0.18s ease;
}
.page-about .year-index__link:hover {
  border-left-color: var(--seal);
  background: var(--paper-2);
}
.page-about .year-index__link.is-current {
  border-left-color: var(--season);
  background: var(--paper-2);
}
.page-about .year-index__num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
}
.page-about .year-index__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink-soft);
}

/* 季节卡片 */
.page-about .season-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 9px;
}
.page-about .season-card {
  padding: 10px 12px;
  background: var(--paper);
  border: 2px solid var(--ink);
  box-shadow: 3px 3px 0 var(--ink);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.page-about .season-card:hover,
.page-about .season-card:focus-within,
.page-about .season-card:focus {
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--ink);
  outline: none;
}
.page-about .season-card__head {
  display: flex;
  align-items: center;
  gap: 10px;
}
.page-about .season-card__swatches {
  display: inline-flex;
  flex: none;
}
.page-about .season-card__swatches i {
  display: block;
  width: 16px;
  height: 16px;
  border: 1px solid var(--ink);
  margin-left: -6px;
}
.page-about .season-card__swatches i:first-child { margin-left: 0; }
.page-about .season-card__name {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
}
.page-about .season-card__months {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-soft);
}
.page-about .season-card__note {
  display: block;
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--ink-soft);
  transition: max-height 0.3s ease, opacity 0.3s ease, margin-top 0.3s ease;
}
.page-about .season-card:hover .season-card__note,
.page-about .season-card:focus-within .season-card__note {
  max-height: 140px;
  opacity: 1;
  margin-top: 8px;
}
.page-about .season-card--spring .season-card__swatches i:nth-child(1) { background: var(--spring); }
.page-about .season-card--spring .season-card__swatches i:nth-child(2) { background: var(--spring-2); }
.page-about .season-card--summer .season-card__swatches i:nth-child(1) { background: var(--summer); }
.page-about .season-card--summer .season-card__swatches i:nth-child(2) { background: var(--summer-2); }
.page-about .season-card--autumn .season-card__swatches i:nth-child(1) { background: var(--autumn); }
.page-about .season-card--autumn .season-card__swatches i:nth-child(2) { background: var(--autumn-2); }
.page-about .season-card--winter .season-card__swatches i:nth-child(1) { background: var(--winter); }
.page-about .season-card--winter .season-card__swatches i:nth-child(2) { background: var(--winter-2); }

@media (hover: none) {
  .page-about .season-card__note {
    max-height: none;
    opacity: 1;
    margin-top: 8px;
  }
}

/* ---------- 章节流 ---------- */
.page-about .about-stream {
  display: flex;
  flex-direction: column;
  gap: var(--about-flow);
  min-width: 0;
}
.page-about .about-sec { min-width: 0; }
.page-about .section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  margin-bottom: 24px;
}
.page-about .section-head__num {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  padding: 9px 9px 8px;
  background: var(--season);
  color: var(--season-on);
  border: 2px solid var(--ink);
  box-shadow: 3px 3px 0 var(--ink);
}
.page-about .section-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 3.2vw, 31px);
  font-weight: 800;
  line-height: 1.32;
  letter-spacing: -0.01em;
}
.page-about .section-head__desc {
  margin: 9px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-soft);
}
.page-about .about-sec__cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
  align-items: start;
}
.page-about .about-sec__cols .prose p {
  margin: 0 0 16px;
  font-size: 16.5px;
  line-height: 1.88;
}
.page-about .about-sec__cols .prose p:last-child { margin-bottom: 0; }
.page-about .about-lead {
  margin: 0 0 26px;
  padding-left: 18px;
  border-left: 4px solid var(--season);
  font-family: var(--font-display);
  font-size: clamp(16px, 2.1vw, 20px);
  font-weight: 600;
  line-height: 1.78;
}
.page-about .about-note {
  margin: 22px 0 0;
  padding: 14px 16px;
  background: var(--paper-2);
  border-left: 4px solid var(--ink);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- 图片 ---------- */
.page-about .about-fig { margin: 0; }
.page-about .about-fig .figure__media {
  overflow: hidden;
  background: var(--paper-3);
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-soft);
}
.page-about .about-fig .figure__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
  height: auto;
}
.page-about .about-fig--tall .figure__media { aspect-ratio: 4 / 3; }
.page-about .about-fig--wide .figure__media { aspect-ratio: 3 / 2; }
.page-about .about-fig--square .figure__media { aspect-ratio: 1 / 1; }
.page-about .about-fig--tall .figure__media img,
.page-about .about-fig--wide .figure__media img,
.page-about .about-fig--square .figure__media img { height: 100%; }
.page-about .about-fig .figure__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink-soft);
}
.page-about .about-fig--wide { margin-top: clamp(26px, 4vw, 44px); }

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 22px;
  width: 2px;
  background: var(--line);
}
.page-about .timeline__item {
  position: relative;
  padding-left: 42px;
  padding-bottom: 30px;
}
.page-about .timeline__item:last-child { padding-bottom: 0; }
.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 16px;
  height: 16px;
  background: var(--season);
  border: 2px solid var(--ink);
  box-shadow: 2px 2px 0 var(--ink);
}
.page-about .timeline__meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
}
.page-about .timeline__year {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.page-about .timeline__meta .tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  padding: 2px 7px;
  border: 1px solid var(--ink);
  background: var(--season-2);
  color: var(--ink);
}
.page-about .timeline__title {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.42;
}
.page-about .timeline__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------- 团队分工 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}
.page-about .team-card {
  padding: 20px 18px 22px;
  background: var(--paper-2);
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-soft);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.page-about .team-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard);
}
.page-about .team-card__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--seal);
}
.page-about .team-card__title {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
}
.page-about .team-card__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-soft);
}

/* ---------- 季节色带 ---------- */
.page-about .season-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: var(--ink);
  border: 2px solid var(--ink);
  margin-bottom: clamp(24px, 3.5vw, 36px);
}
.page-about .season-band__cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  justify-content: space-between;
  min-height: 108px;
  padding: 18px 14px;
  background: var(--paper-2);
  border-top: 8px solid var(--line);
}
.page-about .season-band__cell--spring { border-top-color: var(--spring); }
.page-about .season-band__cell--summer { border-top-color: var(--summer); }
.page-about .season-band__cell--autumn { border-top-color: var(--autumn); }
.page-about .season-band__cell--winter { border-top-color: var(--winter); }
.page-about .season-band__name {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 800;
  line-height: 1;
}
.page-about .season-band__desc {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

/* ---------- 资质列表 ---------- */
.page-about .cred-list {
  display: flex;
  flex-direction: column;
  border-top: 2px solid var(--ink);
}
.page-about .cred-item {
  display: grid;
  grid-template-columns: minmax(0, auto) minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}
.page-about .cred-item__num {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  white-space: nowrap;
}
.page-about .cred-item__label {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  background: var(--ink);
  color: var(--paper);
  padding-block: clamp(44px, 6vw, 76px);
}
.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  align-items: center;
}
.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 3.2vw, 31px);
  font-weight: 800;
  line-height: 1.34;
}
.page-about .about-cta__text {
  margin: 12px 0 0;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--paper-3);
}
.page-about .about-cta__actions { margin: 0; }
.page-about .about-cta .btn--ghost {
  border-color: var(--paper);
  color: var(--paper);
  background: transparent;
}
.page-about .about-cta .btn--ghost:hover {
  background: var(--paper);
  color: var(--ink);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .team-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .season-band { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 820px) {
  .page-about .about-sec__cols {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.85fr);
  }
}

@media (min-width: 860px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.6fr) auto;
    gap: 48px;
  }
}

@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(40px, 4.5vw, 68px);
  }
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }
}

@media (min-width: 1040px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(260px, 0.85fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__seal,
  .page-about .season-card,
  .page-about .team-card,
  .page-about .about-crumb a,
  .page-about .year-index__link,
  .page-about .season-card__note {
    transition: none;
  }
  .page-about .about-hero__seal:hover { transform: rotate(-2deg); }
  .page-about .season-card:hover,
  .page-about .season-card:focus-within,
  .page-about .team-card:hover { transform: none; }
}