.page-about {
  --about-text: #c6d5e4;
  --about-hair: rgba(124, 147, 176, 0.22);
  --about-wood-line: rgba(192, 132, 71, 0.45);
  --about-ink-soft: #33404f;
  font-family: var(--font-sans);
  color: var(--c-paper);
  background:
    radial-gradient(120% 70% at 10% 0%, rgba(56, 225, 208, 0.09), transparent 58%),
    radial-gradient(90% 60% at 92% 8%, rgba(255, 123, 69, 0.07), transparent 60%),
    var(--c-deep);
  overflow-x: hidden;
}

.page-about h2 {
  margin: 0.55rem 0 0;
  font-size: clamp(1.5rem, 4.6vw, 2.15rem);
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.005em;
}

.page-about .breadcrumb {
  padding-top: 1rem;
}

/* ---------- 首屏声明 ---------- */
.page-about .about-intro {
  padding: clamp(1.4rem, 4vw, 2.4rem) 0 clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .about-intro__inner {
  display: grid;
  gap: 1rem;
}

.page-about .about-intro__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-about h1 {
  margin: 0;
  max-width: 20ch;
  font-size: clamp(1.95rem, 7vw, 3.4rem);
  line-height: 1.14;
  font-weight: 700;
  letter-spacing: -0.012em;
}

.page-about .about-intro__lead {
  margin: 0;
  max-width: 64ch;
  font-size: clamp(0.98rem, 2.6vw, 1.0625rem);
  line-height: 1.82;
  color: var(--about-text);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0.6rem 0 0;
  padding: 0;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-facts > div {
  padding: 0.9rem 1rem;
  background: rgba(5, 13, 24, 0.78);
}

.page-about .about-facts dt {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--c-steel);
}

.page-about .about-facts dd {
  margin: 0.35rem 0 0;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(1.35rem, 5vw, 1.9rem);
  line-height: 1.05;
  color: var(--c-paper);
}

/* ---------- 通栏图 ---------- */
.page-about .about-banner {
  margin: 0;
  border-top: 1px solid var(--about-hair);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.page-about .about-banner .frame__caption {
  padding: 0.7rem clamp(1rem, 4vw, 2.5rem) 0.85rem;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--c-steel);
  background: rgba(5, 13, 24, 0.86);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  padding: clamp(2.8rem, 7vw, 4.5rem) 0 0;
}

.page-about .about-timeline__head {
  display: grid;
  gap: 0.6rem;
  max-width: 62ch;
  margin-bottom: 1.6rem;
}

.page-about .about-timeline__note {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.78;
  color: var(--about-text);
}

.page-about .about-rail {
  margin: 0 0 1.4rem;
}

.page-about .about-rail ol {
  display: flex;
  gap: 0.4rem;
  margin: 0;
  padding: 0 0 0.3rem;
  list-style: none;
  overflow-x: auto;
}

.page-about .about-rail a {
  display: grid;
  place-items: center;
  min-width: 2.6rem;
  height: 2.2rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-steel);
  text-decoration: none;
  border: 1px solid var(--about-hair);
  border-radius: 2px;
  background: rgba(5, 13, 24, 0.7);
  transition: color 160ms ease, border-color 160ms ease, background 160ms ease;
}

.page-about .about-rail a:hover,
.page-about .about-rail a:focus-visible {
  color: var(--c-cyan);
  border-color: var(--line-cyan);
  background: rgba(56, 225, 208, 0.08);
}

.page-about .about-track {
  display: grid;
  gap: 1.5rem;
  margin: 0;
  padding: 0 0 0 1.6rem;
  list-style: none;
  border-left: 1px solid var(--about-wood-line);
}

.page-about .about-node {
  position: relative;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: calc(-1.6rem - 5px);
  top: 1.4rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-cyan);
  box-shadow: 0 0 0 4px rgba(56, 225, 208, 0.14);
  transition: background 160ms ease, box-shadow 160ms ease;
}

.page-about .about-node.is-active::before {
  background: var(--c-orange);
  box-shadow: 0 0 0 8px rgba(255, 123, 69, 0.18);
}

.page-about .about-node__card {
  padding: 1.15rem 1.2rem 1.25rem;
  border-top: 3px solid var(--c-wood);
  border-radius: var(--radius);
  background: var(--c-paper);
  color: var(--c-ink);
  box-shadow: 0 10px 26px rgba(5, 13, 24, 0.35);
}

.page-about .about-node__season {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.73rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: #8a6a3e;
}

.page-about .about-node__card h3 {
  margin: 0.45rem 0 0.5rem;
  font-size: clamp(1.08rem, 3.6vw, 1.32rem);
  line-height: 1.32;
  font-weight: 700;
  letter-spacing: -0.005em;
}

.page-about .about-node__card p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

.page-about .about-node--dark .about-node__card {
  background: rgba(5, 13, 24, 0.88);
  color: var(--c-paper);
  border-top-color: var(--c-cyan);
  box-shadow: inset 0 0 0 1px var(--about-hair), 0 10px 26px rgba(5, 13, 24, 0.4);
}

.page-about .about-node--dark .about-node__season {
  color: var(--c-cyan);
}

.page-about .about-node--dark .about-node__card p {
  color: var(--about-text);
}

.page-about .about-node__more {
  margin-top: 0.85rem;
  padding-top: 0.6rem;
  border-top: 1px dashed rgba(16, 24, 34, 0.22);
}

.page-about .about-node--dark .about-node__more {
  border-top-color: var(--about-hair);
}

.page-about .about-node__more summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: #8a6a3e;
}

.page-about .about-node--dark .about-node__more summary {
  color: var(--c-cyan);
}

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

.page-about .about-node__more summary::after {
  content: " ＋";
}

.page-about .about-node__more[open] summary::after {
  content: " －";
}

.page-about .about-node__more p {
  margin: 0.55rem 0 0;
  font-size: 0.88rem;
}

/* ---------- 档案带 ---------- */
.page-about .about-archives {
  margin-top: clamp(2.8rem, 7vw, 4.5rem);
  padding: clamp(2rem, 5vw, 3rem) 0;
  background: var(--c-night);
  border-top: 1px solid var(--about-hair);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-archives__grid {
  display: grid;
  gap: 1.5rem;
}

.page-about .about-archives__pic {
  margin: 0;
}

.page-about .about-archives__pic img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-archives__text {
  display: grid;
  gap: 0.5rem;
  align-content: start;
}

.page-about .about-archives__text p:not(.plate) {
  margin: 0;
  max-width: 58ch;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--about-text);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: clamp(2.8rem, 7vw, 4.5rem) 0 0;
}

.page-about .about-team__grid {
  display: grid;
  gap: 2rem;
}

.page-about .about-team__text {
  display: grid;
  gap: 0.6rem;
  align-content: start;
}

.page-about .about-team__text p:not(.plate) {
  margin: 0;
  max-width: 60ch;
  font-size: 0.96rem;
  line-height: 1.82;
  color: var(--about-text);
}

.page-about .about-rings {
  display: grid;
  gap: 0.9rem;
  margin: 0.8rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ring-row {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.page-about .ring {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 4.2rem;
  height: 4.2rem;
  border-radius: 50%;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 1.3rem;
  line-height: 1;
}

.page-about .ring--cyan {
  color: var(--c-cyan);
  border: 2px solid rgba(56, 225, 208, 0.5);
  box-shadow: inset 0 0 22px rgba(56, 225, 208, 0.14);
  animation: about-ring-breath 4s ease-in-out infinite;
}

.page-about .ring--wood {
  color: var(--c-wood-soft);
  border: 2px solid rgba(192, 132, 71, 0.55);
}

.page-about .ring--orange {
  color: var(--c-orange);
  border: 2px solid rgba(255, 123, 69, 0.5);
}

.page-about .ring-row p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--about-text);
}

.page-about .ring-row strong {
  color: var(--c-paper);
  font-weight: 700;
}

.page-about .about-team__pic {
  margin: 1.2rem 0 0;
}

.page-about .about-team__pic img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-team__pic .frame__caption {
  margin-top: 0.5rem;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--c-steel);
}

@keyframes about-ring-breath {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.035); }
}

/* ---------- 数据来源 ---------- */
.page-about .about-sources {
  padding: clamp(2.8rem, 7vw, 4.5rem) 0 0;
}

.page-about .about-sources__lead {
  margin: 0.9rem 0 0;
  max-width: 66ch;
  font-size: 0.96rem;
  line-height: 1.82;
  color: var(--about-text);
}

.page-about .about-sources__grid {
  display: grid;
  gap: 1px;
  margin-top: 1.6rem;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-src {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding: 1.2rem 1.25rem 1.3rem;
  background: rgba(5, 13, 24, 0.86);
}

.page-about .about-src__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-steel);
}

.page-about .about-src__num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(1.9rem, 6vw, 2.7rem);
  line-height: 1;
  letter-spacing: -0.02em;
}

.page-about .about-src__text {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.72;
  color: var(--about-text);
}

.page-about .about-src--a {
  background: var(--c-paper);
}

.page-about .about-src--a .about-src__label {
  color: #8a6a3e;
}

.page-about .about-src--a .about-src__num {
  color: #123c3a;
}

.page-about .about-src--a .about-src__text {
  color: var(--about-ink-soft);
}

.page-about .about-src--b .about-src__num {
  color: var(--c-cyan);
}

.page-about .about-src--c {
  background: rgba(192, 132, 71, 0.16);
}

.page-about .about-src--c .about-src__num {
  color: var(--c-wood-soft);
}

.page-about .about-src--d {
  background: rgba(56, 225, 208, 0.08);
}

.page-about .about-src--d .about-src__num {
  color: var(--c-orange);
}

/* ---------- 赛季报告 ---------- */
.page-about .about-report {
  padding: clamp(2.8rem, 7vw, 4.5rem) 0 0;
}

.page-about .about-report__grid {
  display: grid;
  gap: 1.8rem;
}

.page-about .about-report__lead {
  display: grid;
  gap: 0.6rem;
  align-content: start;
}

.page-about .about-report__lead p:not(.plate) {
  margin: 0;
  max-width: 58ch;
  font-size: 0.96rem;
  line-height: 1.82;
  color: var(--about-text);
}

.page-about .about-report__card {
  position: relative;
  padding: 1.2rem 1.25rem 1.35rem;
}

.page-about .about-report__card::before,
.page-about .about-report__card::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  border: 1px solid var(--c-wood);
  pointer-events: none;
}

.page-about .about-report__card::before {
  top: -6px;
  left: -6px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-report__card::after {
  right: -6px;
  bottom: -6px;
  border-left: 0;
  border-top: 0;
}

.page-about .report-index summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: #8a6a3e;
}

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

.page-about .report-index summary::after {
  content: " ＋";
}

.page-about .report-index[open] summary::after {
  content: " －";
}

.page-about .report-index ol {
  display: grid;
  gap: 0.85rem;
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .report-index li {
  display: grid;
  grid-template-columns: 2.1rem minmax(0, 1fr);
  gap: 0.75rem;
  padding-top: 0.7rem;
  border-top: 1px solid rgba(16, 24, 34, 0.14);
}

.page-about .report-index li > span {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.8rem;
  color: #8a6a3e;
}

.page-about .report-index h4 {
  margin: 0 0 0.2rem;
  font-size: 0.96rem;
  line-height: 1.4;
  font-weight: 700;
  color: var(--c-ink);
}

.page-about .report-index p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.7;
  color: #3b4a5c;
}

/* ---------- 昆明 ---------- */
.page-about .about-kunming {
  margin-top: clamp(2.8rem, 7vw, 4.5rem);
  padding: clamp(2.2rem, 6vw, 3.6rem) 0;
  background: linear-gradient(180deg, rgba(5, 13, 24, 0.94), rgba(10, 26, 47, 0.55));
  border-top: 1px solid var(--line-wood);
  border-bottom: 1px solid var(--line-wood);
}

.page-about .about-kunming__grid {
  display: grid;
  gap: 1.6rem;
}

.page-about .about-kunming__text {
  display: grid;
  gap: 0.7rem;
  align-content: start;
}

.page-about .about-kunming__text p:not(.plate) {
  margin: 0;
  max-width: 60ch;
  font-size: 0.96rem;
  line-height: 1.82;
  color: var(--about-text);
}

.page-about .about-kunming__swatch {
  display: flex;
  height: 3.2rem;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--about-hair);
}

.page-about .swatch {
  flex: 1;
}

.page-about .swatch--cool {
  background: linear-gradient(120deg, #16324f, #0a1a2f);
}

.page-about .swatch--warm {
  background: linear-gradient(120deg, #c08447, #ebd3ac);
}

.page-about .swatch--cyan {
  background: linear-gradient(120deg, #38e1d0, #1c7d74);
}

/* ---------- 接下来 ---------- */
.page-about .about-next {
  padding: clamp(2.8rem, 7vw, 4.5rem) 0 clamp(3rem, 7vw, 5rem);
}

.page-about .about-next__lead {
  margin: 0.9rem 0 0;
  max-width: 64ch;
  font-size: 0.96rem;
  line-height: 1.82;
  color: var(--about-text);
}

.page-about .about-next__links {
  display: grid;
  gap: 0.9rem;
  margin-top: 1.6rem;
}

.page-about .about-link {
  display: grid;
  gap: 0.35rem;
  padding: 1.25rem 1.3rem 1.35rem;
  text-decoration: none;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  background: rgba(5, 13, 24, 0.62);
  transition: border-color 160ms ease, transform 160ms ease, background 160ms ease;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  border-color: var(--line-cyan);
  background: rgba(56, 225, 208, 0.06);
  transform: translateY(-2px);
}

.page-about .about-link__title {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--c-paper);
}

.page-about .about-link__desc {
  font-size: 0.88rem;
  line-height: 1.72;
  color: var(--about-text);
}

.page-about .about-link__go {
  margin-top: 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--c-cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .about-sources__grid {
    grid-template-columns: 1.05fr 1fr 1fr;
    grid-template-areas:
      "big b c"
      "big d d";
  }

  .page-about .about-src--big { grid-area: big; }
  .page-about .about-src--a { grid-area: big; }
  .page-about .about-src--b { grid-area: b; }
  .page-about .about-src--c { grid-area: c; }
  .page-about .about-src--d { grid-area: d; }

  .page-about .about-next__links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-timeline__grid {
    display: grid;
    grid-template-columns: 4.5rem minmax(0, 1fr);
    gap: 2.5rem;
  }

  .page-about .about-rail {
    position: sticky;
    top: 7rem;
    margin: 0;
    align-self: start;
  }

  .page-about .about-rail ol {
    flex-direction: column;
    gap: 0.45rem;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-about .about-node__card {
    padding: 1.35rem 1.6rem 1.45rem;
  }

  .page-about .about-archives__grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 2.6rem;
    align-items: center;
  }

  .page-about .about-team__grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 2.8rem;
    align-items: start;
  }

  .page-about .about-team__pic {
    margin-top: 0;
  }

  .page-about .about-report__grid {
    grid-template-columns: 0.92fr 1.08fr;
    gap: 2.8rem;
    align-items: start;
  }

  .page-about .about-kunming__grid {
    grid-template-columns: 1.35fr 0.65fr;
    gap: 2.6rem;
    align-items: center;
  }
}

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

  .page-about .about-link {
    transition: none;
  }
}