.page-about {
  --about-gap: clamp(20px, 3vw, 36px);
  --about-cut: 16px;
  display: block;
  background: var(--ink);
  color: var(--text);
}

/* ---------- 章节栏与回到顶部（页面作用域微调） ---------- */
.page-about .chapter-rail__link {
  font-family: var(--font-body);
}

.page-about .to-top {
  font-family: var(--font-mono);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  padding: clamp(32px, 6vw, 72px) 0 clamp(44px, 7vw, 92px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -34% -16% auto -26%;
  height: 92%;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(45% 60% at 22% 36%, rgba(53, 240, 224, 0.17), transparent 68%),
    radial-gradient(40% 55% at 78% 6%, rgba(138, 107, 255, 0.16), transparent 70%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line) 16%, var(--line) 84%, transparent);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
}

.page-about .about-hero__title {
  margin: 0.16em 0 0.32em;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 7vw, 4.2rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-hero__title::after {
  content: "";
  display: block;
  width: clamp(64px, 12vw, 132px);
  height: 3px;
  margin-top: 0.5em;
  background: linear-gradient(90deg, var(--cyan), rgba(53, 240, 224, 0));
}

.page-about .about-hero__lead {
  max-width: 40ch;
  color: var(--muted);
}

.page-about .about-hero__side {
  padding-left: 18px;
  border-left: 2px solid var(--cyan);
  max-width: 40ch;
  font-family: var(--font-serif);
  font-size: clamp(1rem, 1.5vw, 1.16rem);
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-hero__side p {
  margin: 0;
}

/* ---------- 首屏数据带 ---------- */
.page-about .about-stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(34px, 5vw, 62px) 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stats__cell {
  background: var(--ink-2);
  padding: 20px 18px 22px;
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.4rem, 3.2vw, 2rem);
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-stats__label {
  display: block;
  margin-top: 8px;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------- 章节刊头微调 ---------- */
.page-about .section-head__index {
  font-family: var(--font-serif);
  color: var(--cyan);
  opacity: 0.92;
}

.page-about .section-head__lead {
  max-width: 46ch;
}

/* ---------- 通用媒体框 ---------- */
.page-about .media {
  margin: 0;
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .media__cap {
  padding: 10px 14px;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--muted);
  background: var(--ink-2);
  border-top: 1px solid var(--line);
}

.page-about .about-hero__media {
  margin-top: clamp(26px, 4vw, 42px);
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 0 100%);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0 0 0 clamp(14px, 3vw, 28px);
  border-left: 1px solid var(--line);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: clamp(14px, 2.4vw, 24px);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: 12px;
  left: calc(-1 * clamp(14px, 3vw, 28px) - 6px);
  width: 11px;
  height: 11px;
  background: var(--cyan);
  box-shadow: 0 0 14px rgba(53, 240, 224, 0.55);
  clip-path: polygon(0 0, 100% 0, 100% 64%, 64% 100%, 0 100%);
}

.page-about .about-node__summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 8px 12px;
  cursor: pointer;
  list-style: none;
  border: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

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

.page-about .about-node__summary:hover,
.page-about .about-node[open] > .about-node__summary {
  border-color: var(--line);
  background: var(--panel);
}

.page-about .about-node__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-node__name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
}

.page-about .about-node__mark {
  position: relative;
  flex: none;
  align-self: center;
  width: 12px;
  height: 12px;
  margin-left: auto;
}

.page-about .about-node__mark::before,
.page-about .about-node__mark::after {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 12px;
  height: 1px;
  background: var(--cyan);
  transition: transform 0.3s var(--ease);
}

.page-about .about-node__mark::after {
  transform: rotate(90deg);
}

.page-about .about-node[open] .about-node__mark::after {
  transform: rotate(0deg);
}

.page-about .about-node__body {
  max-width: 62ch;
  padding: 12px 12px 4px;
}

.page-about .about-node__body p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .about-bars {
  display: grid;
  gap: 16px;
}

.page-about .about-bar {
  padding: 15px 16px 17px;
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .about-bar:hover,
.page-about .about-bar:focus-within {
  transform: translateX(4px);
  box-shadow: 0 0 0 1px rgba(53, 240, 224, 0.42), 0 18px 40px -30px rgba(53, 240, 224, 0.9);
}

.page-about .about-bar__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-bar__name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
}

.page-about .about-bar__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.92rem;
  color: var(--cyan);
}

.page-about .about-bar__track {
  height: 8px;
  margin: 12px 0 10px;
  background: rgba(27, 58, 99, 0.65);
  overflow: hidden;
}

.page-about .about-bar__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), rgba(53, 240, 224, 0.22));
}

.page-about .about-bar:nth-child(1) .about-bar__fill { width: 36.8%; }
.page-about .about-bar:nth-child(2) .about-bar__fill { width: 28.9%; }
.page-about .about-bar:nth-child(3) .about-bar__fill { width: 18.4%; }
.page-about .about-bar:nth-child(4) .about-bar__fill { width: 15.8%; }

.page-about .about-bar__scope {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-team__media {
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
}

/* ---------- 厂商 ---------- */
.page-about .about-vendors {
  display: grid;
  gap: clamp(22px, 3.4vw, 38px);
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .about-vendors__top {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 52px);
  align-items: center;
}

.page-about .about-vendors__copy .prose {
  margin: 0 0 18px;
  color: var(--muted);
}

.page-about .about-vendors__copy .prose:last-of-type {
  margin-bottom: 16px;
}

.page-about .about-vendors__meta {
  margin: 0;
  padding: 10px 14px;
  font-size: 0.84rem;
  color: var(--coral-soft);
  border-left: 2px solid var(--coral);
  background: rgba(255, 106, 77, 0.08);
}

.page-about .about-vendors__media {
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
}

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

.page-about .about-table {
  border: 1px solid var(--line);
  background: var(--panel);
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-table table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
}

.page-about .about-table caption {
  caption-side: top;
  padding: 13px 16px;
  text-align: left;
  font-family: var(--font-body);
  font-size: 0.84rem;
  color: var(--muted);
  background: var(--ink-2);
  border-bottom: 1px solid var(--line);
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 13px 16px;
  text-align: left;
  white-space: nowrap;
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-table thead th {
  position: sticky;
  top: 0;
  z-index: 2;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--cyan-soft);
  background: var(--ink-2);
}

.page-about .about-table tbody th,
.page-about .about-table tbody td {
  color: var(--text);
}

.page-about .about-table tbody th {
  font-weight: 500;
  color: var(--text);
}

.page-about .about-table th:first-child,
.page-about .about-table td:first-child {
  position: sticky;
  left: 0;
  z-index: 3;
  background: var(--panel);
  box-shadow: 1px 0 0 var(--line);
}

.page-about .about-table thead th:first-child {
  z-index: 4;
  background: var(--ink-2);
}

.page-about .about-table tbody tr:hover td,
.page-about .about-table tbody tr:hover th {
  background: rgba(53, 240, 224, 0.06);
}

.page-about .about-table tbody tr:hover th:first-child {
  background: #163056;
}

/* ---------- 覆盖与节奏 ---------- */
.page-about .about-reach {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(26px, 4vw, 44px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-reach__col {
  background: var(--ink);
  padding: clamp(22px, 3vw, 32px);
}

.page-about .about-reach__kicker {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-reach__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(1.15rem, 2vw, 1.35rem);
  line-height: 1.4;
  color: var(--text);
}

.page-about .about-reach__list {
  list-style: none;
  display: grid;
  gap: 12px;
  margin: 18px 0 0;
  padding: 0;
}

.page-about .about-reach__list li {
  position: relative;
  padding-left: 18px;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-reach__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 8px;
  height: 2px;
  background: var(--cyan);
}

/* ---------- 内容流程 ---------- */
.page-about .about-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.4vw, 26px);
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .about-flow__step {
  padding: 22px 18px 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
}

.page-about .about-flow__idx {
  display: block;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--coral);
}

.page-about .about-flow__title {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.02rem;
  color: var(--text);
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.82;
  color: var(--muted);
}

/* ---------- 三张收束卡片 ---------- */
.page-about .about-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 26px 22px 24px;
  text-decoration: none;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
  transition: transform 0.32s var(--ease), box-shadow 0.32s var(--ease), border-color 0.32s var(--ease);
}

.page-about .about-card:hover,
.page-about .about-card:focus-visible {
  transform: translateY(-6px);
  border-color: rgba(53, 240, 224, 0.5);
  box-shadow: 0 0 0 1px rgba(53, 240, 224, 0.32), 0 24px 48px -32px rgba(53, 240, 224, 0.9);
}

.page-about .about-card__kicker {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--violet);
}

.page-about .about-card__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.18rem;
  line-height: 1.35;
  color: var(--text);
}

.page-about .about-card__text {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-card__more {
  margin-top: auto;
  padding-top: 12px;
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--cyan);
}

/* ---------- 中等屏幕 ---------- */
@media (min-width: 720px) {
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 860px) {
  .page-about .about-reach {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-card:nth-child(1) {
    margin-top: 56px;
  }

  .page-about .about-card:nth-child(3) {
    margin-top: 28px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-vendors__top {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }

  .page-about .about-hero {
    padding-left: clamp(0px, 3vw, 48px);
    padding-right: clamp(0px, 3vw, 48px);
  }
}

@media (min-width: 1080px) {
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 窄屏保护 ---------- */
@media (max-width: 480px) {
  .page-about .about-hero__side {
    padding-left: 14px;
  }

  .page-about .about-node__summary {
    flex-wrap: wrap;
    row-gap: 4px;
  }

  .page-about .about-node__mark {
    margin-left: 0;
  }

  .page-about .about-stats__cell {
    padding: 16px 14px 18px;
  }
}

/* ---------- 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
    transform: none !important;
  }
}