.page-about {
  --about-cut: 14px;
}

/* ---------- 首屏 ---------- */
.page-about .about-intro {
  display: grid;
  gap: clamp(1.75rem, 1rem + 3vw, 3.25rem);
  margin-top: clamp(1.5rem, 1rem + 2vw, 2.75rem);
  align-items: start;
}

@media (min-width: 64rem) {
  .page-about .about-intro {
    grid-template-columns: minmax(0, 1.4fr) minmax(18rem, 0.72fr);
  }
}

.page-about .about-intro-lead {
  max-width: 46rem;
}

.page-about .about-facts {
  position: relative;
  padding: clamp(1.25rem, .9rem + 1vw, 1.75rem);
  background:
    linear-gradient(155deg, rgba(45, 226, 230, .1), rgba(10, 15, 30, .3) 58%),
    var(--void-deep);
  border: 1px solid var(--line-strong);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, var(--about-cut) 100%, 0 calc(100% - var(--about-cut)));
}

.page-about .about-facts::after {
  content: "";
  position: absolute;
  top: 0;
  right: var(--about-cut);
  width: 3.5rem;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--neon));
}

.page-about .about-facts-title {
  margin: 0 0 1rem;
  font-size: var(--step--1);
  letter-spacing: .22em;
  color: var(--cyan);
}

.page-about .fact-list {
  margin: 0;
  display: grid;
  gap: .85rem;
}

.page-about .fact-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: .3rem .75rem;
  padding-bottom: .8rem;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .fact-row:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .fact-label {
  margin: 0;
  font-size: var(--step--1);
  letter-spacing: .05em;
  color: var(--text-mute);
}

.page-about .fact-value {
  margin: 0;
  font-size: var(--step-0);
  font-weight: 600;
  color: var(--white);
}

/* ---------- 起点 ---------- */
.page-about .origin-lede {
  max-width: 60ch;
  margin: 0;
  font-size: var(--step-1);
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .origin-list {
  list-style: none;
  margin: clamp(1.75rem, 1rem + 2vw, 2.75rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

@media (min-width: 56rem) {
  .page-about .origin-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .origin-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .15rem .9rem;
  align-items: start;
  padding: clamp(1.25rem, 1rem + 1vw, 1.75rem);
  background: var(--void-deep);
  border-left: 2px solid transparent;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .origin-item:hover {
  border-left-color: var(--neon);
  background: linear-gradient(180deg, rgba(255, 107, 44, .08), var(--void-deep) 70%);
}

.page-about .origin-num {
  padding-top: .3rem;
  font-size: var(--step--1);
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .origin-item .h3 {
  margin: 0;
  font-size: var(--step-1);
  color: var(--white);
}

.page-about .origin-item p {
  margin: .5rem 0 0;
  font-size: .95rem;
  line-height: 1.75;
  color: var(--text-dim);
}

/* ---------- 版本时间线 ---------- */
.page-about .tl-media {
  margin: 0 0 clamp(1.75rem, 1rem + 2vw, 2.75rem);
}

.page-about .media-frame img {
  max-width: 100%;
  height: auto;
}

.page-about .tl-wrap {
  display: grid;
  gap: clamp(1.25rem, 1rem + 1.5vw, 2.25rem);
}

@media (min-width: 64rem) {
  .page-about .tl-wrap {
    grid-template-columns: 4.75rem minmax(0, 1fr);
  }
}

.page-about .tl-rail {
  display: none;
}

@media (min-width: 64rem) {
  .page-about .tl-rail {
    display: block;
    position: sticky;
    top: 6.5rem;
    align-self: start;
  }
}

.page-about .tl-rail ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .6rem;
}

.page-about .tl-rail a {
  display: block;
  padding: .4rem .5rem;
  font-size: var(--step--1);
  letter-spacing: .18em;
  color: var(--text-mute);
  text-decoration: none;
  border-left: 2px solid var(--line-soft);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .tl-rail a:hover,
.page-about .tl-rail a:focus-visible {
  color: var(--cyan);
  border-left-color: var(--cyan);
}

.page-about .tl-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(.9rem, .7rem + .8vw, 1.4rem);
}

.page-about .tl-item {
  background:
    linear-gradient(118deg, rgba(45, 226, 230, .07), rgba(26, 42, 58, .45) 42%, var(--void-deep));
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
  transition: border-color var(--dur) var(--ease);
}

.page-about .tl-item:hover {
  border-color: var(--line-strong);
}

.page-about .tl-head {
  margin: 0;
}

.page-about .tl-trigger {
  width: 100%;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(.75rem, .5rem + 1vw, 1.25rem);
  padding: clamp(1rem, .85rem + .6vw, 1.4rem) clamp(1rem, .85rem + .8vw, 1.6rem);
  background: none;
  border: 0;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .tl-trigger:hover .tl-title {
  color: var(--cyan);
}

.page-about .tl-trigger .disclosure-index,
.page-about .tl-index {
  font-size: var(--step-1);
  letter-spacing: .1em;
  color: var(--neon);
}

.page-about .tl-title {
  font-size: var(--step-1);
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--white);
  transition: color var(--dur) var(--ease);
}

.page-about .tl-item .disclosure-panel-inner {
  padding: 0 clamp(1rem, .85rem + .8vw, 1.6rem) clamp(1.1rem, .9rem + .8vw, 1.5rem);
  color: var(--text-dim);
  line-height: 1.78;
}

.page-about .tl-item .disclosure-panel-inner > p {
  max-width: 66ch;
  margin: 0;
}

.page-about .tl-points {
  list-style: none;
  max-width: 66ch;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  gap: .55rem;
}

.page-about .tl-points li {
  position: relative;
  padding-left: 1.35rem;
  font-size: .95rem;
  line-height: 1.7;
  color: var(--text);
}

.page-about .tl-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: .75rem;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 团队 ---------- */
.page-about .team-layout {
  display: grid;
  gap: clamp(1.5rem, 1rem + 2vw, 2.5rem);
  margin-top: clamp(1.75rem, 1rem + 2vw, 2.5rem);
}

@media (min-width: 64rem) {
  .page-about .team-layout {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    align-items: start;
  }
}

.page-about .team-filter {
  flex-wrap: wrap;
  gap: .5rem;
}

.page-about .team-grid {
  display: grid;
  gap: 1rem;
  margin-top: 1.25rem;
}

@media (min-width: 40rem) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .team-grid > [hidden] {
  display: none;
}

.page-about .team-card {
  position: relative;
  padding: clamp(1.1rem, .9rem + .8vw, 1.5rem);
  background: var(--slate);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .team-card:hover {
  transform: translateY(-3px);
  border-color: var(--line-strong);
  background: linear-gradient(150deg, rgba(45, 226, 230, .1), var(--slate) 60%);
}

.page-about .team-role {
  margin: 0 0 .5rem;
  font-size: var(--step--1);
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .team-card .h3 {
  margin: 0 0 .5rem;
  font-size: var(--step-1);
  color: var(--white);
}

.page-about .team-card p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.72;
  color: var(--text-dim);
}

/* ---------- 服务覆盖 ---------- */
.page-about .geo-media {
  margin: 0 0 clamp(1.5rem, 1rem + 2vw, 2.25rem);
}

.page-about .geo-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(9rem, 1fr));
  gap: .75rem;
}

.page-about .geo-cell {
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: .85rem 1rem;
  background: rgba(26, 42, 58, .55);
  border: 1px solid var(--line);
  border-left: 2px solid var(--line-soft);
  font-size: var(--step-0);
  color: var(--text-dim);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .geo-cell:hover {
  color: var(--white);
  border-left-color: var(--neon);
  background: rgba(255, 107, 44, .12);
  transform: translateY(-2px);
}

.page-about .geo-cell .mono {
  font-size: var(--step--1);
  letter-spacing: .08em;
  color: var(--cyan);
}

/* ---------- 运营记录 ---------- */
.page-about .trust-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(1.5rem, 1rem + 2vw, 2.25rem);
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 56rem) {
  .page-about .trust-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .trust-item {
  padding: clamp(1.25rem, 1rem + 1vw, 1.75rem);
  background: var(--void-deep);
}

.page-about .trust-num {
  margin: 0;
  font-size: var(--step-2);
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--neon);
}

.page-about .trust-label {
  margin: .55rem 0 0;
  font-size: var(--step--1);
  letter-spacing: .05em;
  color: var(--text-dim);
}

.page-about .trust-notes {
  display: grid;
  gap: 1rem;
  margin-top: clamp(1.25rem, 1rem + 1.5vw, 2rem);
}

@media (min-width: 56rem) {
  .page-about .trust-notes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .trust-card {
  padding: clamp(1.25rem, 1rem + 1vw, 1.6rem);
  background: var(--paper);
  color: var(--paper-ink);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, var(--about-cut) 100%, 0 calc(100% - var(--about-cut)));
}

.page-about .trust-card .h3 {
  margin: 0 0 .6rem;
  font-size: var(--step-1);
  color: var(--paper-ink);
}

.page-about .trust-card p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.78;
  color: rgba(26, 23, 18, .78);
}

/* ---------- 相关栏目 ---------- */
.page-about .next-links {
  list-style: none;
  margin: clamp(1.25rem, 1rem + 1.5vw, 2rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

@media (min-width: 56rem) {
  .page-about .next-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .next-links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 1.25rem;
  background: var(--void-deep);
  color: var(--text);
  font-size: var(--step-0);
  text-decoration: none;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-about .next-links a:hover,
.page-about .next-links a:focus-visible {
  padding-left: 1.6rem;
  background: linear-gradient(90deg, rgba(45, 226, 230, .14), var(--void-deep) 72%);
  color: var(--white);
}

.page-about .next-links a span {
  font-family: var(--font-mono);
  color: var(--cyan);
}

/* ---------- 窄屏收敛 ---------- */
@media (max-width: 40rem) {
  .page-about .fact-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .page-about .tl-trigger {
    grid-template-columns: auto minmax(0, 1fr);
  }

  .page-about .tl-trigger .disclosure-icon {
    grid-column: 2;
    justify-self: start;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card:hover,
  .page-about .geo-cell:hover {
    transform: none;
  }

  .page-about .next-links a:hover,
  .page-about .next-links a:focus-visible {
    padding-left: 1.25rem;
  }
}