.page-about {
  --about-paper-ink: #3A342B;
  --about-paper-dim: #6E6555;
  padding-bottom: 0;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 22px var(--pad) 0;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--note);
}
.page-about .breadcrumb a {
  color: var(--note);
  text-decoration: none;
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--orange);
}
.page-about .breadcrumb__sep {
  color: var(--graphite);
  opacity: .9;
}

/* ---------- 开篇 ---------- */
.page-about .about-hero {
  position: relative;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 28px var(--pad) 56px;
  display: grid;
  gap: 30px;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(34px, 9.5vw, 60px);
  line-height: 1.06;
  letter-spacing: -.015em;
  font-weight: 700;
  color: var(--mist);
  text-wrap: balance;
}
.page-about .about-hero__title::after {
  content: "";
  display: block;
  width: 72px;
  height: 4px;
  margin-top: 22px;
  background: var(--orange);
  box-shadow: 0 0 24px rgba(255, 107, 0, .75);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__media {
  margin: 0;
}
.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  filter: saturate(.94) contrast(1.04);
}

.page-about .about-hero__side {
  display: none;
}

/* ---------- 区块头 ---------- */
.page-about .section-head {
  display: grid;
  gap: 8px;
  margin: 0 0 30px;
}
.page-about .section-head__index {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .24em;
  color: var(--orange);
}
.page-about .section-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 5.4vw, 38px);
  line-height: 1.16;
  letter-spacing: -.01em;
  font-weight: 700;
}
.page-about .section-head__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--note);
}

/* ---------- 年份带 ---------- */
.page-about .about-years {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 44px var(--pad) 60px;
  border-top: 1px solid var(--line-soft);
}

.page-about .year-strip {
  list-style: none;
  margin: 0 calc(var(--pad) * -1);
  padding: 6px var(--pad) 22px;
  display: flex;
  gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--orange-dim) transparent;
}
.page-about .year-strip::-webkit-scrollbar {
  height: 6px;
}
.page-about .year-strip::-webkit-scrollbar-track {
  background: var(--graphite);
  border-radius: 99px;
}
.page-about .year-strip::-webkit-scrollbar-thumb {
  background: var(--orange-dim);
  border-radius: 99px;
}

.page-about .year-card {
  scroll-snap-align: start;
  flex: 0 0 78%;
  max-width: 320px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px 20px 22px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--ink-2), var(--ink));
  box-shadow: var(--shadow-card);
}
.page-about .year-card:nth-child(even) {
  background: var(--paper);
  border-color: var(--paper-edge);
  color: var(--about-paper-ink);
  box-shadow: 0 24px 40px -32px rgba(0, 0, 0, .9), inset 0 0 0 1px rgba(255, 255, 255, .5);
}

.page-about .year-card__num {
  margin: 0;
  font-family: var(--font-data);
  font-size: clamp(32px, 8vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--orange);
}
.page-about .year-card:nth-child(even) .year-card__num {
  color: var(--orange-dim);
}

.page-about .year-card__title {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .year-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--note);
}
.page-about .year-card:nth-child(even) .year-card__text {
  color: var(--about-paper-dim);
}

.page-about .year-card .tag {
  align-self: flex-start;
  margin-top: auto;
}

/* ---------- 能力里程碑（暖纸带） ---------- */
.page-about .about-milestones {
  background-color: var(--paper);
  background-image: radial-gradient(rgba(58, 52, 43, .11) 1px, transparent 1px);
  background-size: 14px 14px;
  color: var(--about-paper-ink);
  padding: 52px var(--pad) 64px;
}

.page-about .dragon-line-wrap {
  margin: 0 0 26px;
}
.page-about .dragon-line {
  display: block;
  width: 100%;
  height: auto;
  max-height: 110px;
}

.page-about .milestone-list {
  display: grid;
  gap: 12px;
}

.page-about .milestone {
  border: 1px solid var(--paper-edge);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, .58);
  overflow: hidden;
  transition: background-color .2s ease, box-shadow .2s ease;
}
.page-about .milestone[open] {
  background: #fff;
  box-shadow: 0 18px 34px -30px rgba(0, 0, 0, .8);
}

.page-about .milestone__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}
.page-about .milestone__summary::-webkit-details-marker {
  display: none;
}
.page-about .milestone__summary:focus-visible {
  outline: 2px solid var(--orange-dim);
  outline-offset: -2px;
}

.page-about .milestone__idx {
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--orange-dim);
}

.page-about .milestone__title {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--about-paper-ink);
}

.page-about .milestone__meta {
  display: none;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--about-paper-dim);
  white-space: nowrap;
}

.page-about .milestone__body {
  padding: 0 18px 20px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-paper-dim);
}
.page-about .milestone__body p {
  margin: 0 0 10px;
}
.page-about .milestone__body p:last-child {
  margin-bottom: 0;
}
.page-about .milestone__body a {
  color: var(--orange-dim);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 56px var(--pad) 64px;
}

.page-about .about-team__grid {
  display: grid;
  gap: 34px;
}

.page-about .team-figure {
  display: grid;
  gap: 22px;
  justify-items: center;
}

.page-about .team-ring {
  position: relative;
  width: 216px;
  height: 216px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: conic-gradient(
    var(--orange) 0 41.2%,
    var(--jade) 41.2% 73.6%,
    var(--graphite) 73.6% 100%
  );
  box-shadow: 0 0 0 1px var(--line), 0 26px 50px -34px rgba(0, 0, 0, .95);
}
.page-about .team-ring::before {
  content: "";
  position: absolute;
  inset: 30px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--line);
}
.page-about .team-ring__core {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 6px;
  justify-items: center;
  text-align: center;
}
.page-about .team-ring__core b {
  font-family: var(--font-data);
  font-size: 46px;
  font-weight: 700;
  line-height: 1;
  color: var(--mist);
}
.page-about .team-ring__core em {
  font-style: normal;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--note);
}

.page-about .team-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  width: 100%;
  max-width: 300px;
  display: grid;
  gap: 10px;
  font-size: 14px;
  color: var(--note);
}
.page-about .team-legend li {
  display: flex;
  align-items: center;
  gap: 9px;
}
.page-about .team-legend b {
  margin-left: auto;
  font-family: var(--font-data);
  font-size: 15px;
  color: var(--mist);
}

.page-about .dot {
  flex: none;
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.page-about .dot--orange { background: var(--orange); }
.page-about .dot--jade { background: var(--jade); }
.page-about .dot--graphite {
  background: var(--graphite);
  border: 1px solid var(--line);
}

.page-about .about-team__text {
  font-size: 16px;
  line-height: 1.8;
  color: var(--note);
}
.page-about .about-team__text p {
  margin: 0 0 14px;
}
.page-about .about-team__text p:last-child {
  margin-bottom: 0;
}
.page-about .about-team__link {
  padding-left: 14px;
  border-left: 2px solid var(--orange);
  color: var(--mist);
}
.page-about .about-team__link a {
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid var(--line-orange);
}
.page-about .about-team__link a:hover,
.page-about .about-team__link a:focus-visible {
  color: var(--mist);
  border-bottom-color: var(--mist);
}

.page-about .about-team__media {
  margin: 34px 0 0;
}
.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  filter: saturate(.9) contrast(1.06);
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  background: var(--ink-2);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  padding: 52px var(--pad) 64px;
}
.page-about .about-partners__inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

.page-about .partner-grid {
  display: grid;
  gap: 16px;
}

.page-about .partner-card {
  position: relative;
  padding: 24px 22px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255, 255, 255, .02), rgba(0, 0, 0, .3));
}
.page-about .partner-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  bottom: 24px;
  width: 3px;
  border-radius: 0 3px 3px 0;
}
.page-about .partner-card:nth-child(1)::before { background: var(--orange); }
.page-about .partner-card:nth-child(2)::before { background: var(--jade); }
.page-about .partner-card:nth-child(3)::before { background: var(--orange-dim); }

.page-about .partner-card__title {
  margin: 0 0 12px;
  font-size: 17px;
  font-weight: 700;
  color: var(--mist);
}
.page-about .partner-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--note);
}

.page-about .about-partners__row {
  display: grid;
  gap: 26px;
  margin-top: 32px;
}
.page-about .about-partners__media {
  margin: 0;
}
.page-about .about-partners__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}
.page-about .about-partners__note {
  align-self: center;
}
.page-about .about-partners__lead {
  margin: 0 0 12px;
  font-size: 17px;
  line-height: 1.7;
  color: var(--mist);
}
.page-about .about-partners__note .muted {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--note);
}
.page-about .about-partners__note a {
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid var(--line-orange);
}

/* ---------- 数据底座（暖纸带） ---------- */
.page-about .about-base {
  background-color: var(--paper);
  background-image: linear-gradient(180deg, rgba(203, 191, 168, .45), rgba(245, 239, 228, 0) 45%);
  color: var(--about-paper-ink);
  padding: 52px var(--pad) 68px;
  border-top: 2px solid var(--orange);
}

.page-about .base-grid {
  display: grid;
  gap: 1px;
  margin: 0;
  background: var(--paper-edge);
  border: 1px solid var(--paper-edge);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .base-item {
  background: var(--paper);
  padding: 22px 20px 24px;
}
.page-about .base-item dt {
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--about-paper-dim);
}
.page-about .base-item dd {
  margin: 0 0 10px;
  font-family: var(--font-data);
  font-size: clamp(28px, 7vw, 36px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--about-paper-ink);
}
.page-about .base-item dd span {
  margin-left: 6px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--about-paper-dim);
}
.page-about .base-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-paper-dim);
}

/* ---------- 收尾 ---------- */
.page-about .about-next {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 56px var(--pad) 76px;
  display: grid;
  gap: 14px;
  justify-items: start;
}
.page-about .about-next__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 5.6vw, 40px);
  line-height: 1.18;
  font-weight: 700;
  color: var(--mist);
}
.page-about .about-next__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--note);
}
.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .year-card {
    flex: 0 0 300px;
  }
  .page-about .milestone__summary {
    grid-template-columns: auto minmax(0, 1fr) auto;
  }
  .page-about .milestone__meta {
    display: block;
  }
  .page-about .base-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, .96fr);
    align-items: start;
    gap: 44px;
    padding-top: 48px;
    padding-bottom: 76px;
  }
  .page-about .about-hero__text {
    grid-column: 1;
    padding-top: 10px;
  }
  .page-about .about-hero__media {
    grid-column: 2;
    margin-top: 40px;
  }

  .page-about .about-team__grid {
    grid-template-columns: 300px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }
  .page-about .team-figure {
    justify-items: start;
  }

  .page-about .about-partners__row {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    gap: 40px;
  }

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

@media (min-width: 1080px) {
  .page-about .about-years {
    padding-top: 56px;
    padding-bottom: 72px;
  }
  .page-about .year-strip {
    margin-inline: calc(var(--pad) * -1);
  }
  .page-about .about-partners .partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 1240px) {
  .page-about .about-hero__side {
    display: block;
    position: absolute;
    right: 4px;
    top: 96px;
    margin: 0;
    writing-mode: vertical-rl;
    letter-spacing: .34em;
    font-size: 11px;
    color: var(--note);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .year-strip {
    scroll-behavior: auto;
  }
  .page-about .milestone,
  .page-about .year-card {
    transition: none;
  }
}
</main>