.page-about {
  --about-panel: #0F1E3A;
  --about-track: rgba(39, 64, 95, 0.55);
  position: relative;
  background: var(--ink-900);
  color: var(--text);
  font-family: var(--font-body);
  overflow-x: hidden;
}

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

.page-about .media-frame {
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--ink-800);
}

.page-about .media-frame img {
  width: 100%;
  object-fit: cover;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 112px 0 56px;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 85% at 88% 0%, rgba(53, 224, 208, 0.16), transparent 62%),
    radial-gradient(95% 75% at 0% 100%, rgba(255, 179, 71, 0.1), transparent 64%),
    linear-gradient(180deg, #0A1428 0%, #0F1E3A 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--about-track) 1px, transparent 1px),
    linear-gradient(to bottom, var(--about-track) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(78% 68% at 50% 38%, #000 0%, transparent 100%);
  mask-image: radial-gradient(78% 68% at 50% 38%, #000 0%, transparent 100%);
  opacity: 0.42;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(2.15rem, 8.4vw, 4.4rem);
  line-height: 1.06;
  letter-spacing: -0.005em;
  margin: 18px 0 20px;
  max-width: 17em;
}

.page-about .about-hero__lead {
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-dim);
  max-width: 62ch;
  margin: 0;
}

.page-about .about-facts {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.page-about .about-facts__item {
  background: var(--ink-800);
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-facts__num {
  font-family: var(--font-num);
  font-size: 1.45rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .about-facts__num--amber {
  color: var(--amber);
}

.page-about .about-facts__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-dim);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: 56px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-section--last {
  border-bottom: 0;
}

.page-about .about-head {
  display: grid;
  gap: 16px;
  margin-bottom: 36px;
}

.page-about .about-head__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(2.6rem, 12vw, 4.4rem);
  line-height: 0.86;
  letter-spacing: 0.04em;
  color: var(--cyan);
  opacity: 0.92;
}

.page-about .about-head__main {
  border-top: 1px solid var(--line);
  padding-top: 18px;
}

.page-about .about-head__main .section__title {
  margin: 0 0 10px;
}

.page-about .about-head__main .section__desc {
  margin: 0;
  max-width: 60ch;
}

/* ---------- 01 档案起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-origin__body p {
  margin: 0 0 18px;
  font-size: 15.5px;
  line-height: 1.88;
  color: var(--text-dim);
}

.page-about .about-origin__body p:last-child {
  margin-bottom: 0;
}

.page-about .about-origin__body a,
.page-about .about-timeline__foot a,
.page-about .about-more a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(127, 240, 230, 0.4);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-origin__body a:hover,
.page-about .about-timeline__foot a:hover,
.page-about .about-more a:hover {
  color: var(--amber);
  border-bottom-color: rgba(255, 179, 71, 0.6);
}

.page-about .about-origin__figure {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .about-origin__caption {
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--text-dim);
  padding-left: 12px;
  border-left: 2px solid var(--cyan);
}

.page-about .about-archive {
  margin-top: 36px;
  padding: 20px 18px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--ink-800);
}

.page-about .about-archive__meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  text-transform: uppercase;
}

.page-about .about-archive__bar {
  height: 6px;
  margin: 12px 0 14px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--cyan) 0%, #6FD8E0 46%, var(--amber) 100%);
  box-shadow: 0 0 22px rgba(53, 224, 208, 0.22);
}

.page-about .about-archive__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 02 校验流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

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

.page-about .about-flow__card {
  height: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--ink-800);
  padding: 16px 16px 18px;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-flow__card[open] {
  border-color: rgba(53, 224, 208, 0.55);
  background:
    linear-gradient(180deg, rgba(53, 224, 208, 0.08), rgba(53, 224, 208, 0) 72%),
    var(--ink-800);
}

.page-about .about-flow__summary {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
  color: var(--text);
}

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

.page-about .about-flow__summary::after {
  content: "";
  margin-left: auto;
  flex: none;
  width: 8px;
  height: 8px;
  border-right: 1.5px solid var(--cyan);
  border-bottom: 1.5px solid var(--cyan);
  transform: rotate(45deg) translateY(-2px);
  transition: transform 0.2s var(--ease);
}

.page-about .about-flow__card[open] .about-flow__summary::after {
  transform: rotate(-135deg) translateY(-2px);
}

.page-about .about-flow__idx {
  font-family: var(--font-num);
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  color: var(--amber);
  flex: none;
}

.page-about .about-flow__text {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

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

.page-about .about-flow__figure {
  margin: 30px 0 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .about-flow__caption {
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--text-dim);
  padding-left: 12px;
  border-left: 2px solid var(--amber);
}

/* ---------- 03 版本演进 ---------- */
.page-about .about-timeline__figure {
  margin: 0 0 26px;
}

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

.page-about .about-timeline__track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .about-timeline__item {
  position: relative;
  width: 100%;
  padding: 20px 18px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background:
    linear-gradient(180deg, rgba(53, 224, 208, 0.07), rgba(10, 20, 40, 0) 68%),
    var(--ink-800);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 18px;
  right: 18px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--cyan), rgba(53, 224, 208, 0));
}

.page-about .about-timeline__mark {
  display: inline-block;
  font-family: var(--font-num);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--amber);
  margin-bottom: 8px;
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.2rem;
  line-height: 1.35;
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-timeline__foot {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-dim);
}

/* ---------- 04 团队分工 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-team__card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 22px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--ink-800);
}

.page-about .about-team__role {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.25rem;
  letter-spacing: 0.02em;
  color: var(--text);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-team__card--amber .about-team__role {
  border-bottom-color: rgba(255, 179, 71, 0.45);
}

.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-team__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-team__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
}

.page-about .about-team__card--amber .about-team__list li::before {
  background: var(--amber);
}

.page-about .about-team__rhythm {
  margin: auto 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--text-dim);
  letter-spacing: 0.01em;
}

/* ---------- 05 联系与合规 ---------- */
.page-about .about-info {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-info__item {
  padding: 18px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--ink-800);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-info__item--wide {
  background:
    linear-gradient(150deg, rgba(53, 224, 208, 0.1), rgba(53, 224, 208, 0) 62%),
    var(--ink-800);
  border-color: rgba(53, 224, 208, 0.4);
}

.page-about .about-info__label {
  font-family: var(--font-num);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--text-dim);
  text-transform: uppercase;
}

.page-about .about-info__value {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
}

.page-about .about-info__value--mono {
  font-family: var(--font-num);
  letter-spacing: 0.06em;
  color: var(--cyan-soft);
}

.page-about .about-info__mail {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.page-about .about-info__mail-text {
  font-family: var(--font-num);
  font-size: 14px;
  letter-spacing: 0.01em;
  color: var(--cyan-soft);
  word-break: break-all;
}

.page-about .about-info__note {
  margin: 2px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-more {
  margin: 24px 0 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--text-dim);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 136px 0 72px;
  }

  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-top: 48px;
  }

  .page-about .about-facts__item {
    padding: 22px 20px;
  }

  .page-about .about-facts__num {
    font-size: 1.7rem;
  }

  .page-about .about-section {
    padding: 72px 0;
  }

  .page-about .about-head {
    grid-template-columns: 108px minmax(0, 1fr);
    column-gap: 32px;
    align-items: start;
    margin-bottom: 44px;
  }

  .page-about .about-archive {
    margin-top: 44px;
    padding: 24px 24px 22px;
  }
}

@media (min-width: 768px) {
  .page-about .about-timeline {
    overflow-x: auto;
    overflow-y: hidden;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 14px;
    scrollbar-width: thin;
    scrollbar-color: var(--line) transparent;
  }

  .page-about .about-timeline::-webkit-scrollbar {
    height: 6px;
  }

  .page-about .about-timeline::-webkit-scrollbar-thumb {
    background: var(--line);
    border-radius: 999px;
  }

  .page-about .about-timeline__track {
    flex-direction: row;
    min-width: max-content;
    gap: 16px;
    padding: 4px 4px 4px 0;
  }

  .page-about .about-timeline__item {
    flex: 0 0 300px;
    width: auto;
    scroll-snap-align: start;
  }

  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-info {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-info__item--wide {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-about .about-section {
    padding: 88px 0;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-origin__body p {
    font-size: 16px;
  }

  .page-about .about-info {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-info__item--wide {
    grid-column: 1 / -1;
  }

  .page-about .about-more {
    max-width: 76ch;
  }
}

@media (min-width: 1024px) {
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
    align-items: stretch;
  }

  .page-about .about-flow__arrow {
    display: block;
    position: absolute;
    top: 32px;
    right: -18px;
    width: 20px;
    height: 12px;
    color: var(--line);
    z-index: 1;
  }

  .page-about .about-flow__step:last-child .about-flow__arrow {
    display: none;
  }

  .page-about .about-flow__figure {
    margin-top: 38px;
  }

  .page-about .about-timeline__figure {
    margin-bottom: 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-flow__summary::after,
  .page-about .about-flow__card,
  .page-about .about-origin__body a,
  .page-about .about-timeline__foot a,
  .page-about .about-more a {
    transition: none;
  }
}