.page-about {
  --about-rail: 88px;
  --about-spine-line: rgba(61, 255, 158, 0.42);
  --about-rule: rgba(195, 207, 221, 0.16);
  padding-bottom: 48px;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 20px 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--gray);
}

.page-about .breadcrumb a {
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms ease, border-color 180ms ease;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--brand);
  border-bottom-color: var(--brand);
}

.page-about .breadcrumb__sep {
  color: var(--line);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  margin-top: 20px;
  padding: 34px 22px 30px;
  border-radius: var(--radius-m);
  background:
    radial-gradient(130% 150% at 92% -10%, rgba(61, 255, 158, 0.13) 0%, rgba(7, 14, 26, 0) 58%),
    linear-gradient(158deg, var(--panel) 0%, var(--ink-900) 72%);
  overflow: hidden;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(36px, 8vw, 64px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--silver);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 30px;
  margin: 26px 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__facts li {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-size: 13px;
  color: var(--gray);
}

.page-about .about-hero__facts b {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  line-height: 1;
  color: var(--brand);
  letter-spacing: -0.01em;
}

/* ---------- 章节骨架 ---------- */

.page-about .about-chapter {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 28px;
  padding: 36px 0 8px;
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--bar-h) + 24px);
}

.page-about .about-rail {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 14px;
}

.page-about .about-idx {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--brand);
}

.page-about .about-spine {
  flex: 0 0 auto;
  width: 30px;
  height: 1px;
  background: linear-gradient(90deg, var(--about-spine-line) 0%, rgba(61, 255, 158, 0) 100%);
}

.page-about .about-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 4vw, 38px);
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--white);
}

.page-about .about-head__desc {
  margin: 14px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--silver);
}

.page-about .about-note {
  margin: 22px 0 0;
  max-width: 64ch;
  padding-left: 16px;
  border-left: 2px solid var(--about-spine-line);
  font-size: 14px;
  line-height: 1.78;
  color: var(--gray);
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: 28px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--panel);
}

.page-about .about-figure--band img {
  aspect-ratio: 10 / 4;
}

.page-about .about-figure .media__caption {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--gray);
}

/* ---------- 01 团队 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 26px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-role {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 20px 24px;
  background: var(--panel);
  transition: background 200ms ease;
}

.page-about .about-role:hover {
  background: #11223a;
}

.page-about .about-role__num {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--brand);
}

.page-about .about-role__name {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-about .about-role__text {
  margin: 2px 0 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--gray);
}

/* ---------- 02 覆盖表格 ---------- */

.page-about .about-table-wrap {
  margin-top: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--ink-950);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .about-table th {
  padding: 12px 16px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--gray);
  white-space: nowrap;
  background: rgba(7, 14, 26, 0.9);
  border-bottom: 1px solid var(--line);
}

.page-about .about-table td {
  padding: 13px 16px;
  vertical-align: top;
  line-height: 1.65;
  color: var(--silver);
  border-bottom: 1px solid var(--line);
}

.page-about .about-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .about-table tbody tr:hover td {
  background: rgba(14, 27, 46, 0.72);
}

.page-about .about-table td:first-child {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 800;
  white-space: nowrap;
  color: var(--white);
}

.page-about .about-table td:nth-child(2) {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--gray);
  white-space: nowrap;
}

/* ---------- 03 时间轴 ---------- */

.page-about .about-timeline {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tick {
  position: relative;
  padding: 0 0 0 26px;
  border-left: 1px solid var(--about-rule);
  outline: none;
}

.page-about .about-tick__dot {
  position: absolute;
  left: -5px;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--brand-dim);
  transition: background 200ms ease, border-color 200ms ease, box-shadow 200ms ease;
}

.page-about .about-tick:hover .about-tick__dot,
.page-about .about-tick:focus .about-tick__dot {
  background: var(--brand);
  border-color: var(--brand);
  box-shadow: 0 0 0 4px rgba(61, 255, 158, 0.16);
}

.page-about .about-tick__time {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--white);
  transition: color 200ms ease;
}

.page-about .about-tick:hover .about-tick__time,
.page-about .about-tick:focus .about-tick__time {
  color: var(--brand);
}

.page-about .about-tick__act {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--gray);
  transition: color 200ms ease;
}

.page-about .about-tick:hover .about-tick__act,
.page-about .about-tick:focus .about-tick__act {
  color: var(--silver);
}

/* ---------- 04 阶段 ---------- */

.page-about .about-stages {
  position: relative;
  margin: 28px 0 0;
  padding: 0 0 0 24px;
  list-style: none;
  border-left: 1px solid var(--about-rule);
}

.page-about .about-stage {
  position: relative;
  padding: 0 0 30px;
}

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

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--line);
}

.page-about .about-stage:last-child::before {
  background: var(--brand);
  border-color: var(--brand);
}

.page-about .about-stage__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--gray);
}

.page-about .about-stage__name {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-stage__text {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--gray);
}

/* ---------- 05 流程 ---------- */

.page-about .about-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow__step {
  padding: 18px 18px 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 2px solid var(--brand-dim);
  border-radius: var(--radius-s);
  transition: transform 200ms ease, box-shadow 200ms ease;
}

.page-about .about-flow__step:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lift);
}

.page-about .about-flow__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--brand);
}

.page-about .about-flow__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-flow__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--gray);
}

.page-about .about-fields {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-fields li {
  padding: 6px 13px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--silver);
  background: rgba(14, 27, 46, 0.72);
  border: 1px solid var(--line);
  border-radius: 100px;
}

/* ---------- 06 数据 ---------- */

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 20px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stat {
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-stat__num span {
  margin-left: 3px;
  font-size: 15px;
  font-weight: 500;
  color: var(--brand);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 9px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--gray);
}

/* ---------- 收尾 ---------- */

.page-about .about-exit {
  margin-top: 44px;
  padding: 30px 22px 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background:
    linear-gradient(200deg, rgba(61, 255, 158, 0.08) 0%, rgba(7, 14, 26, 0) 62%),
    var(--panel);
}

.page-about .about-exit__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 3.4vw, 28px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-exit__text {
  margin: 12px 0 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--silver);
}

.page-about .about-exit__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-hero {
    padding: 40px 30px 34px;
  }
}

@media (min-width: 780px) {
  .page-about .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
    background: var(--line);
    border: 1px solid var(--line);
    border-radius: var(--radius-m);
    overflow: hidden;
  }
  .page-about .about-flow__step {
    border: 0;
    border-radius: 0;
  }
  .page-about .about-flow__step:hover {
    transform: none;
    box-shadow: none;
    background: #11223a;
  }
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: 36px;
    padding: 56px 0 12px;
    margin-top: 36px;
  }

  .page-about .about-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .page-about .about-idx {
    font-size: 52px;
  }

  .page-about .about-spine {
    width: 1px;
    height: auto;
    min-height: 120px;
    flex: 1 1 auto;
    align-self: stretch;
    background: linear-gradient(180deg, var(--about-spine-line) 0%, rgba(61, 255, 158, 0) 94%);
  }

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

  .page-about .about-timeline {
    grid-auto-flow: column;
    grid-auto-columns: minmax(0, 1fr);
    gap: 0;
    margin-top: 34px;
  }

  .page-about .about-tick {
    padding: 28px 18px 0 0;
    border-left: 0;
    border-top: 1px solid var(--about-rule);
  }

  .page-about .about-tick:last-child {
    padding-right: 0;
  }

  .page-about .about-tick__dot {
    left: 0;
    top: -5px;
  }

  .page-about .about-stage__name {
    font-size: 20px;
  }

  .page-about .about-exit {
    padding: 40px 34px 42px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-flow__step,
  .page-about .about-tick__dot,
  .page-about .about-tick__time,
  .page-about .about-tick__act {
    transition: none;
  }
  .page-about .about-flow__step:hover {
    transform: none;
  }
}