.page-about {
  --about-line: rgba(233, 244, 238, 0.14);
  --about-rail: 5.25rem;
  background: var(--ink);
  color: var(--mist);
  overflow-x: clip;
}

.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
}

.page-about .sec-title {
  margin: 0.5rem 0 0.85rem;
  font-size: clamp(1.5rem, 2.6vw, 2.25rem);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -0.012em;
  color: var(--mist);
}

.page-about .breadcrumbs {
  margin-bottom: 1.75rem;
  font-size: 0.8125rem;
}

.page-about .breadcrumbs__sep {
  margin: 0 0.5rem;
  color: var(--gold-deep);
}

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

.page-about summary {
  list-style: none;
  cursor: pointer;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 1.5rem 0 3rem;
  background:
    radial-gradient(62% 76% at 90% 4%, rgba(39, 211, 224, 0.16), transparent 62%),
    radial-gradient(56% 72% at 0% 96%, rgba(138, 99, 255, 0.16), transparent 64%),
    linear-gradient(180deg, var(--ink) 0%, var(--ink-deep) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-about .about-hero__title {
  margin: 0.65rem 0 1rem;
  font-size: clamp(2rem, 6vw, 3.6rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--mist);
  text-wrap: balance;
}

.page-about .about-hero__lede {
  max-width: 42ch;
  color: var(--sage);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 1.25rem;
  margin-top: 1.9rem;
  padding-top: 1.35rem;
  border-top: 1px solid var(--line-gold);
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.page-about .stat__num {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 0.02em;
}

.page-about .stat__label {
  font-size: 0.8125rem;
  line-height: 1.4;
  color: var(--sage);
}

.page-about .about-hero__media {
  margin: 0;
  position: relative;
  background: var(--table);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
}

.page-about .about-hero__media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.04);
}

.page-about .about-hero__media figcaption {
  padding: 0.75rem 1rem;
  font-size: 0.8125rem;
  color: var(--sage);
  border-top: 1px solid var(--line-soft);
  background: rgba(6, 26, 20, 0.7);
}

/* ---------- 起点 ---------- */
.page-about .about-start {
  padding: 3.25rem 0;
  background: var(--table);
  border-bottom: 1px solid var(--line);
}

.page-about .about-start__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
}

.page-about .about-start__note {
  margin: 0.85rem 0 0;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-start__body p {
  margin: 0 0 1rem;
  max-width: 60ch;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .room-list {
  list-style: none;
  margin: 1.6rem 0 1.4rem;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .room-list__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.2rem;
  padding: 0.85rem 0.25rem 0.85rem 0.9rem;
  border-bottom: 1px solid var(--line-soft);
  position: relative;
  transition: background var(--dur) var(--ease);
}

.page-about .room-list__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.9rem;
  bottom: 0.9rem;
  width: 2px;
  background: var(--faint, rgba(244, 184, 74, 0));
  transition: background var(--dur) var(--ease);
}

.page-about .room-list__item:hover::before,
.page-about .room-list__item:focus-within::before {
  background: var(--gold);
}

.page-about .room-list__item:hover {
  background: rgba(23, 74, 58, 0.45);
}

.page-about .room-list__name {
  font-weight: 700;
  font-size: 1rem;
  color: var(--gold-soft);
  letter-spacing: 0.02em;
}

.page-about .room-list__desc {
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--sage);
}

.page-about .about-start__link {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--sage);
}

.page-about .about-start__link a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(39, 211, 224, 0.42);
}

.page-about .about-start__link a:hover {
  color: var(--gold-soft);
  border-bottom-color: var(--gold-soft);
}

/* ---------- 时间线 ---------- */
.page-about .about-chronicle {
  padding: 3.25rem 0;
  background:
    linear-gradient(180deg, var(--ink) 0%, var(--table) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-chronicle .section-head {
  margin-bottom: 2rem;
}

.page-about .about-chronicle .lede {
  max-width: 52ch;
  color: var(--sage);
}

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

.page-about .chronicle__item {
  position: relative;
  padding-left: 1rem;
  border-left: 1px solid var(--line);
}

.page-about .chronicle__item:last-child {
  border-left-color: transparent;
}

.page-about .chronicle__item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 1.35rem;
  width: 7px;
  height: 7px;
  background: var(--cyan);
  transform: rotate(45deg);
  transition: box-shadow var(--dur) var(--ease);
}

.page-about .chronicle__item:hover::before,
.page-about .chronicle__item:focus-within::before {
  box-shadow: 0 0 0 4px rgba(39, 211, 224, 0.22);
}

.page-about .chronicle__entry summary {
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  align-items: center;
  gap: 0.85rem;
  padding: 0.55rem 0.25rem;
  transition: color var(--dur) var(--ease);
}

.page-about .chronicle__year {
  display: inline-block;
  padding: 0.3rem 0.7rem;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ink);
  background: linear-gradient(120deg, var(--gold) 0%, var(--gold-deep) 100%);
  clip-path: polygon(0 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
  width: fit-content;
}

.page-about .chronicle__head {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--mist);
}

.page-about .chronicle__entry[open] .chronicle__head {
  color: var(--gold-soft);
}

.page-about .chronicle__desc {
  margin: 0 0 1.15rem;
  padding-left: 0.25rem;
  max-width: 58ch;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--sage);
}

/* ---------- 三条主线 ---------- */
.page-about .about-lines {
  padding: 3.25rem 0;
  background: var(--table);
  border-bottom: 1px solid var(--line);
}

.page-about .about-lines .section-head {
  margin-bottom: 1.9rem;
}

.page-about .about-lines .lede {
  max-width: 54ch;
  color: var(--sage);
}

.page-about .lines {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .lines__item {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr);
  gap: 0.9rem;
  padding: 1.25rem 0.25rem;
  border-bottom: 1px solid var(--line-soft);
  transition: background var(--dur) var(--ease);
}

.page-about .lines__item:hover {
  background: rgba(23, 74, 58, 0.4);
}

.page-about .lines__num {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--violet);
  line-height: 1.2;
}

.page-about .lines__title {
  margin: 0 0 0.5rem;
  font-size: 1.125rem;
  font-weight: 800;
  color: var(--mist);
  letter-spacing: 0.01em;
}

.page-about .lines__text p {
  margin: 0 0 0.65rem;
  line-height: 1.78;
  color: var(--sage);
}

.page-about .lines__meta {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-lines__figure {
  margin: 2rem 0 0;
  border: 1px solid var(--line);
  background: var(--ink);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 0 100%);
}

.page-about .about-lines__figure img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.9);
}

.page-about .about-lines__figure figcaption {
  padding: 0.75rem 1rem;
  font-size: 0.8125rem;
  color: var(--sage);
  border-top: 1px solid var(--line-soft);
}

/* ---------- 段位阶梯 ---------- */
.page-about .about-ranks {
  padding: 3.25rem 0;
  background:
    radial-gradient(70% 60% at 100% 0%, rgba(138, 99, 255, 0.14), transparent 60%),
    var(--ink);
  border-bottom: 1px solid var(--line);
}

.page-about .about-ranks .section-head {
  margin-bottom: 1.75rem;
}

.page-about .about-ranks .lede {
  max-width: 56ch;
  color: var(--sage);
}

.page-about .ranks {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.page-about .ranks__item:nth-child(1) {
  --rank-color: var(--sage);
}
.page-about .ranks__item:nth-child(2) {
  --rank-color: var(--cyan);
}
.page-about .ranks__item:nth-child(3) {
  --rank-color: var(--gold-soft);
}
.page-about .ranks__item:nth-child(4) {
  --rank-color: var(--gold);
}
.page-about .ranks__item:nth-child(5) {
  --rank-color: var(--violet);
}
.page-about .ranks__item:nth-child(6) {
  --rank-color: var(--coral);
}

.page-about .ranks__entry {
  border: 1px solid var(--line);
  border-left: 3px solid var(--rank-color);
  background: linear-gradient(90deg, rgba(23, 74, 58, 0.55), rgba(12, 43, 34, 0.3));
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .ranks__entry:hover {
  background: linear-gradient(90deg, rgba(30, 90, 71, 0.8), rgba(12, 43, 34, 0.42));
}

.page-about .ranks__entry summary {
  display: grid;
  grid-template-columns: 2.2rem auto;
  grid-template-areas:
    "num name"
    "num hint";
  align-items: center;
  gap: 0.1rem 0.75rem;
  padding: 0.7rem 0.9rem;
}

.page-about .ranks__num {
  grid-area: num;
  font-size: 1rem;
  color: var(--rank-color);
  letter-spacing: 0.04em;
}

.page-about .ranks__name {
  grid-area: name;
  font-size: 1.0625rem;
  font-weight: 800;
  color: var(--mist);
  letter-spacing: 0.04em;
}

.page-about .ranks__hint {
  grid-area: hint;
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--sage);
}

.page-about .ranks__entry[open] .ranks__name {
  color: var(--rank-color);
}

.page-about .ranks__body {
  margin: 0;
  padding: 0 0.9rem 0.9rem 3.85rem;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--sage);
}

/* ---------- 团队与节奏 ---------- */
.page-about .about-team {
  padding: 3.25rem 0;
  background: var(--table);
  border-bottom: 1px solid var(--line);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-about .about-team__main > p {
  max-width: 56ch;
  line-height: 1.8;
  color: var(--sage);
}

.page-about .team-bar {
  display: flex;
  height: 12px;
  margin: 1.5rem 0 1.1rem;
  overflow: hidden;
  background: var(--ink);
}

.page-about .team-bar__seg {
  display: block;
  height: 100%;
}

.page-about .team-bar__seg:nth-child(1) {
  width: 42.9%;
  background: var(--gold);
}
.page-about .team-bar__seg:nth-child(2) {
  width: 21.4%;
  background: var(--cyan);
}
.page-about .team-bar__seg:nth-child(3) {
  width: 25%;
  background: var(--violet);
}
.page-about .team-bar__seg:nth-child(4) {
  width: 10.7%;
  background: var(--coral);
}

.page-about .team-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

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

.page-about .team-role summary {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.7rem 0.2rem;
  transition: background var(--dur) var(--ease);
}

.page-about .team-role summary:hover {
  background: rgba(23, 74, 58, 0.5);
}

.page-about .team-role__dot {
  width: 9px;
  height: 9px;
  flex: none;
  transform: rotate(45deg);
}

.page-about .team-role__dot--gold {
  background: var(--gold);
}
.page-about .team-role__dot--cyan {
  background: var(--cyan);
}
.page-about .team-role__dot--violet {
  background: var(--violet);
}
.page-about .team-role__dot--coral {
  background: var(--coral);
}

.page-about .team-role__name {
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--mist);
}

.page-about .team-role__count {
  margin-left: auto;
  font-size: 0.8125rem;
  color: var(--gold-soft);
  letter-spacing: 0.05em;
}

.page-about .team-role__body {
  margin: 0 0 0.85rem 1.65rem;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--sage);
}

.page-about .about-team__media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 26px 100%, 0 calc(100% - 26px));
}

.page-about .about-team__media img {
  width: 100%;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  filter: saturate(0.9);
}

.page-about .about-team__media figcaption {
  padding: 0.75rem 1rem;
  font-size: 0.8125rem;
  color: var(--sage);
  border-top: 1px solid var(--line-soft);
}

.page-about .cadence {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-about .cadence__item {
  padding: 0.9rem 0 0.9rem 0.95rem;
  border-left: 2px solid var(--line-gold);
  background: linear-gradient(90deg, rgba(23, 74, 58, 0.4), transparent 85%);
}

.page-about .cadence__key {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .cadence__desc {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: var(--sage);
}

/* ---------- 重庆运营 ---------- */
.page-about .about-local {
  padding: 3.25rem 0;
  background: var(--ink);
  border-bottom: 1px solid var(--line);
}

.page-about .about-local__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-about .about-local__text p {
  max-width: 56ch;
  line-height: 1.8;
  color: var(--sage);
}

.page-about .about-local__text a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(39, 211, 224, 0.4);
}

.page-about .about-local__text a:hover {
  color: var(--gold-soft);
  border-bottom-color: var(--gold-soft);
}

.page-about .about-local__links {
  margin-top: 1.5rem;
}

.page-about .contact-card {
  border: 1px solid var(--line-gold);
  background: linear-gradient(160deg, rgba(23, 74, 58, 0.75), rgba(6, 26, 20, 0.9));
  padding: 1.35rem 1.25rem;
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
}

.page-about .contact-card__title {
  margin: 0 0 1rem;
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .contact-card__list {
  margin: 0;
}

.page-about .contact-card__row {
  display: grid;
  grid-template-columns: 4.6rem minmax(0, 1fr);
  gap: 0.75rem;
  padding: 0.55rem 0;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .contact-card__row dt {
  font-size: 0.8125rem;
  color: var(--sage);
}

.page-about .contact-card__row dd {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--mist);
  word-break: break-word;
}

.page-about .contact-card__note {
  margin: 1rem 0 0;
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--gold-soft);
}

/* ---------- 下一站 ---------- */
.page-about .about-next {
  padding: 3rem 0 3.5rem;
  background:
    radial-gradient(60% 80% at 78% 10%, rgba(39, 211, 224, 0.16), transparent 62%),
    linear-gradient(180deg, var(--table) 0%, var(--ink-deep) 100%);
}

.page-about .about-next__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  align-items: center;
}

.page-about .about-next__text p {
  max-width: 54ch;
  margin: 0;
  line-height: 1.8;
  color: var(--sage);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .room-list__item {
    grid-template-columns: 7.5rem minmax(0, 1fr);
    align-items: baseline;
    gap: 1rem;
  }

  .page-about .ranks__entry summary {
    grid-template-columns: 2.4rem 8rem minmax(0, 1fr);
    grid-template-areas: "num name hint";
    gap: 0.9rem;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 2rem 0 4rem;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-start {
    padding: 4.5rem 0;
  }

  .page-about .about-start__grid {
    grid-template-columns: minmax(0, 0.42fr) minmax(0, 0.58fr);
    gap: 3rem;
  }

  .page-about .about-start__aside {
    position: sticky;
    top: 6rem;
    align-self: start;
  }

  .page-about .about-chronicle,
  .page-about .about-lines,
  .page-about .about-ranks,
  .page-about .about-team,
  .page-about .about-local {
    padding: 4.5rem 0;
  }

  .page-about .lines {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-top: none;
    gap: 0 2rem;
  }

  .page-about .lines__item {
    grid-template-columns: 1fr;
    border-top: 2px solid var(--line-gold);
    border-bottom: none;
    padding: 1.35rem 0.25rem 1.5rem;
  }

  .page-about .lines__num {
    display: block;
    margin-bottom: 0.65rem;
    font-size: 1.6rem;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-local__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 2.5rem;
  }

  .page-about .ranks__item:nth-child(2) .ranks__entry {
    margin-left: 0.7rem;
  }
  .page-about .ranks__item:nth-child(3) .ranks__entry {
    margin-left: 1.4rem;
  }
  .page-about .ranks__item:nth-child(4) .ranks__entry {
    margin-left: 2.1rem;
  }
  .page-about .ranks__item:nth-child(5) .ranks__entry {
    margin-left: 2.8rem;
  }
  .page-about .ranks__item:nth-child(6) .ranks__entry {
    margin-left: 3.5rem;
  }
}

@media (min-width: 1200px) {
  .page-about .cadence {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .room-list__item,
  .page-about .ranks__entry,
  .page-about .lines__item,
  .page-about .team-role summary {
    transition: none;
  }

  .page-about .chronicle__item::before {
    transition: none;
  }

  .page-about .chronicle__item:hover::before {
    box-shadow: 0 0 0 2px rgba(39, 211, 224, 0.5);
  }
}

.page-about {
  --faint: transparent;
}