.page-about {
  --about-gap: clamp(20px, 4vw, 40px);
  --about-node: clamp(56px, 9vw, 120px);
  background:
    radial-gradient(120% 78% at 88% 0%, rgba(23, 224, 210, 0.10), transparent 62%),
    radial-gradient(90% 70% at 2% 100%, rgba(111, 168, 220, 0.09), transparent 60%),
    var(--ink);
  color: var(--paper);
  overflow-x: clip;
}

.page-about .section__title {
  font-family: var(--font-display);
  font-size: clamp(26px, 4.6vw, 44px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin: 6px 0 14px;
}

.page-about .section__lead,
.page-about .prose {
  color: var(--muted);
  max-width: 68ch;
}

.page-about .prose {
  font-size: 16px;
  line-height: 1.78;
  margin: 0 0 14px;
}

.page-about .section__head {
  max-width: 76ch;
  margin-bottom: clamp(20px, 3.4vw, 34px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(20px, 4vw, 34px) 0 clamp(38px, 7vw, 76px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 46px);
  align-items: end;
  margin-top: clamp(18px, 3vw, 30px);
}

.page-about .about-hero__lead h1 {
  font-family: var(--font-display);
  font-size: clamp(30px, 7.2vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin: 10px 0 16px;
  background: linear-gradient(96deg, var(--paper) 42%, var(--cyan) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-hero__text {
  font-size: clamp(15px, 2.6vw, 17px);
  line-height: 1.8;
  color: var(--muted);
  max-width: 60ch;
  margin: 0 0 24px;
}

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

.page-about .about-hero__panel {
  position: relative;
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--radius);
  display: grid;
  gap: 18px;
  overflow: hidden;
}

.page-about .about-hero__panel::after {
  content: "";
  position: absolute;
  inset: auto -30% -60% auto;
  width: 220px;
  height: 220px;
  background: linear-gradient(140deg, rgba(255, 106, 31, 0.30), transparent 70%);
  transform: rotate(12deg);
  pointer-events: none;
}

.page-about .about-hero__panel-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0;
}

.page-about .stat {
  display: grid;
  gap: 4px;
}

.page-about .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(28px, 6vw, 40px);
  font-weight: 700;
  line-height: 1;
}

.page-about .stat__label {
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 时间线 ---------- */
.page-about .about-track {
  padding: clamp(34px, 6vw, 72px) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .year-rail {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 12px;
  margin-bottom: clamp(18px, 3vw, 28px);
  scrollbar-width: thin;
}

.page-about .year-chip {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.08em;
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(14, 59, 54, 0.55);
  color: var(--cyan);
  text-decoration: none;
  transition: background 220ms var(--ease), color 220ms var(--ease), transform 220ms var(--ease);
}

.page-about .year-chip:hover,
.page-about .year-chip:focus-visible {
  background: var(--cyan);
  color: var(--ink-deep);
  transform: translateY(-1px);
}

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 34px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 26px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(23, 224, 210, 0.35) 45%, rgba(111, 168, 220, 0.08) 100%);
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 var(--about-gap);
  scroll-margin-top: 120px;
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(23, 224, 210, 0.12);
}

.page-about .tl-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 4.6vw, 32px);
  font-weight: 700;
  color: var(--orange);
  letter-spacing: -0.01em;
  line-height: 1;
}

.page-about .tl-title {
  font-family: var(--font-display);
  font-size: clamp(18px, 3.2vw, 23px);
  margin: 10px 0 8px;
  color: var(--paper);
}

.page-about .tl-text {
  margin: 0 0 12px;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--muted);
  max-width: 66ch;
}

.page-about .tl-band {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .tag--cyan {
  background: rgba(23, 224, 210, 0.14);
  color: var(--cyan);
  border: 1px solid rgba(23, 224, 210, 0.35);
}

/* ---------- 流程步骤 ---------- */
.page-about .about-flow {
  padding: clamp(34px, 6vw, 70px) 0;
  background: linear-gradient(180deg, rgba(8, 13, 12, 0.0), rgba(8, 13, 12, 0.72) 30%, rgba(8, 13, 12, 0.0));
}

.page-about .flow-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .flow-step {
  background: var(--ink);
  padding: clamp(18px, 3.4vw, 26px);
  display: grid;
  gap: 6px;
  position: relative;
  transition: background 260ms var(--ease);
}

.page-about .flow-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--cyan);
  opacity: 0;
  transition: opacity 260ms var(--ease);
}

.page-about .flow-step:hover {
  background: rgba(14, 59, 54, 0.7);
}

.page-about .flow-step:hover::before {
  opacity: 1;
}

.page-about .flow-step__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .flow-step__title {
  font-family: var(--font-display);
  font-size: 18px;
  margin: 0;
  color: var(--paper);
}

.page-about .flow-step__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .flow-step__time {
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--cyan);
  letter-spacing: 0.04em;
}

/* ---------- 覆盖矩阵 ---------- */
.page-about .about-cover {
  padding: clamp(34px, 6vw, 72px) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-cover__intro {
  align-self: center;
}

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

.page-about .cover-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .cover-cell {
  background: var(--ink);
  padding: clamp(14px, 2.6vw, 22px);
  display: grid;
  gap: 4px;
  position: relative;
  transition: background 260ms var(--ease), transform 260ms var(--ease);
}

.page-about .cover-cell__code {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-about .cover-cell__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 6.4vw, 46px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  transition: color 260ms var(--ease);
}

.page-about .cover-cell__name {
  font-family: var(--font-display);
  font-size: 16px;
  margin: 4px 0 0;
  color: var(--paper);
}

.page-about .cover-cell__note {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
  transition: color 260ms var(--ease);
}

.page-about .cover-cell:hover,
.page-about .cover-cell:focus-within {
  background: rgba(14, 59, 54, 0.82);
}

.page-about .cover-cell:hover .cover-cell__num {
  color: var(--orange);
}

.page-about .cover-cell:hover .cover-cell__note {
  color: var(--paper);
}

.page-about .cover-foot {
  margin: clamp(16px, 2.6vw, 24px) 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  border-left: 2px solid var(--cyan);
  padding-left: 14px;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: clamp(34px, 6vw, 72px) 0;
  background:
    linear-gradient(102deg, rgba(23, 224, 210, 0.06) 0%, transparent 34%),
    var(--ink-deep);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 42px);
  align-items: center;
}

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

.page-about .team-figures {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-top: 20px;
}

.page-about .team-figure {
  background: rgba(14, 59, 54, 0.6);
  padding: 16px 12px;
  display: grid;
  gap: 5px;
  text-align: center;
}

.page-about .team-figure__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 4.4vw, 30px);
  font-weight: 700;
  color: var(--amber);
  line-height: 1;
}

.page-about .team-figure__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 双语 ---------- */
.page-about .about-lang {
  padding: clamp(34px, 6vw, 72px) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .lang-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 40px);
  align-items: start;
}

.page-about .lang-table {
  display: grid;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .lang-row {
  display: grid;
  grid-template-columns: 1fr 1.25fr 1fr;
  gap: 8px;
  padding: 12px 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 14px;
  color: var(--paper);
  transition: background 200ms var(--ease), color 200ms var(--ease);
}

.page-about .lang-row:first-child {
  border-top: 0;
}

.page-about .lang-row--head {
  background: rgba(23, 224, 210, 0.10);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .lang-row:not(.lang-row--head):hover {
  background: rgba(255, 106, 31, 0.12);
}

.page-about .lang-row span:nth-child(2) {
  font-family: var(--font-mono);
  color: var(--cyan);
  transition: color 200ms var(--ease);
}

.page-about .lang-row:not(.lang-row--head):hover span:nth-child(2) {
  color: var(--orange);
}

.page-about .lang-side {
  display: grid;
  gap: 18px;
}

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

/* ---------- 为什么选我们 ---------- */
.page-about .about-why {
  padding: clamp(34px, 6vw, 72px) 0 clamp(44px, 7vw, 84px);
  background: linear-gradient(180deg, rgba(8, 13, 12, 0), rgba(8, 13, 12, 0.85));
}

.page-about .why-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .why-card {
  position: relative;
  padding: clamp(20px, 3.2vw, 28px);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  background: rgba(14, 59, 54, 0.42);
  display: grid;
  gap: 8px;
  transition: border-color 260ms var(--ease), transform 260ms var(--ease), background 260ms var(--ease);
}

.page-about .why-card::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 46px;
  height: 3px;
  background: var(--orange);
  opacity: 0.85;
}

.page-about .why-card:hover {
  border-color: rgba(23, 224, 210, 0.42);
  background: rgba(14, 59, 54, 0.68);
  transform: translateY(-2px);
}

.page-about .why-card__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .why-card__title {
  font-family: var(--font-display);
  font-size: clamp(18px, 3vw, 22px);
  margin: 0;
  color: var(--paper);
}

.page-about .why-card__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-cta {
  margin-top: clamp(26px, 4vw, 40px);
  padding: clamp(22px, 3.6vw, 32px);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background:
    linear-gradient(120deg, rgba(23, 224, 210, 0.12), rgba(255, 106, 31, 0.12)),
    rgba(11, 31, 26, 0.9);
  display: grid;
  gap: 18px;
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--paper);
  max-width: 68ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 图片容器 ---------- */
.page-about .media__frame {
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: rgba(8, 13, 12, 0.6);
}

.page-about .media__frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}

.page-about .about-team__figure .media__frame img {
  aspect-ratio: 14 / 9;
}

.page-about .about-lang__figure .media__frame img {
  aspect-ratio: 12 / 7;
}

.page-about .media__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .about-hero__panel::after,
.page-about .why-card::after {
  will-change: transform;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .cover-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

  .page-about .lang-row {
    font-size: 15px;
    padding: 14px 18px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 0.88fr);
  }

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

  .page-about .grid--split {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: clamp(28px, 4vw, 54px);
    align-items: center;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  }

  .page-about .lang-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  }

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

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .timeline {
    padding-left: 46px;
  }

  .page-about .tl-item::before {
    left: -46px;
    width: 18px;
    height: 18px;
  }

  .page-about .timeline::before {
    left: 11px;
  }
}

@media (min-width: 1180px) {
  .page-about .cover-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .cover-cell {
    padding: 26px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .year-chip,
  .page-about .flow-step,
  .page-about .flow-step::before,
  .page-about .cover-cell,
  .page-about .cover-cell__num,
  .page-about .cover-cell__note,
  .page-about .lang-row,
  .page-about .lang-row span,
  .page-about .why-card {
    transition: none;
  }

  .page-about .year-chip:hover,
  .page-about .why-card:hover {
    transform: none;
  }
}