.page-about {
  --about-rule: 1px solid var(--line);
  background: var(--ink);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 42px) 0 clamp(38px, 6vw, 72px);
  background:
    radial-gradient(120% 90% at 80% -12%, rgba(184, 255, 61, 0.10), transparent 58%),
    linear-gradient(180deg, var(--panel) 0%, var(--ink) 80%);
  border-bottom: var(--about-rule);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    90deg,
    transparent 0 95px,
    rgba(41, 72, 62, 0.55) 95px 96px
  );
  opacity: 0.45;
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(36px, 7.4vw, 76px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  max-width: 15ch;
}

.page-about .about-hero .lede {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 48ch;
  color: var(--body-soft);
  font-size: var(--step-0);
  line-height: 1.8;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .about-hero__figure {
  margin: 0;
  border: var(--about-rule);
  background: var(--panel);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.02);
}

.page-about .about-hero__caption {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 14px;
  padding: 10px 12px;
  border-top: var(--about-rule);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------- 数据条 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: clamp(28px, 4vw, 46px);
  border-top: var(--about-rule);
  border-left: var(--about-rule);
}

.page-about .about-stats > div {
  padding: 14px 16px;
  border-right: var(--about-rule);
  border-bottom: var(--about-rule);
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1.1;
  color: var(--lime);
  letter-spacing: -0.02em;
}

.page-about .about-stats__label {
  display: block;
  margin-top: 5px;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

/* ---------- 正文骨架 ---------- */
.page-about .about-story {
  padding-top: clamp(30px, 4.5vw, 56px);
}

.page-about .about-layout {
  display: grid;
  gap: clamp(22px, 3.6vw, 48px);
}

/* ---------- 左侧索引 ---------- */
.page-about .about-index__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
  border-left: var(--about-rule);
}

.page-about .about-index__item {
  position: relative;
  padding: 9px 0;
}

.page-about .about-index__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 17px;
  width: 7px;
  height: 7px;
  background: var(--ink);
  border: 1px solid var(--line);
  transform: translateX(-50%);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-index__link {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  text-decoration: none;
  color: var(--body-soft);
}

.page-about .about-index__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  color: var(--lime);
  min-width: 46px;
}

.page-about .about-index__label {
  font-size: 14px;
  line-height: 1.5;
}

.page-about .about-index__item:hover::before,
.page-about .about-index__link:focus-visible::before {
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .about-index__link:hover .about-index__label,
.page-about .about-index__link:focus-visible .about-index__label {
  color: var(--paper);
}

/* ---------- 叙事章节 ---------- */
.page-about .about-chapter {
  padding: clamp(24px, 3.4vw, 40px) 0;
  border-top: var(--about-rule);
}

.page-about .about-chapter__meta {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 10px;
}

.page-about .about-chapter__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 4vw, 38px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--lime);
}

.page-about .about-chapter__kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-chapter .section-title {
  margin: 0 0 14px;
  font-size: clamp(23px, 3.4vw, 34px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-chapter p {
  margin: 0 0 14px;
  max-width: 62ch;
  color: var(--body-soft);
  line-height: 1.8;
}

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

/* ---------- 摘要标签 ---------- */
.page-about .about-beats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-beats li {
  padding: 5px 10px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--body-soft);
}

/* ---------- 配图 ---------- */
.page-about .about-figure {
  margin: 20px 0 0;
  border: var(--about-rule);
  background: var(--ink-deep);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.85);
}

.page-about .about-figure figcaption {
  padding: 10px 12px;
  border-top: var(--about-rule);
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 加深面板章节 ---------- */
.page-about .about-chapter--panel {
  margin: 0 calc(-1 * clamp(16px, 3vw, 28px));
  padding: clamp(24px, 3.4vw, 40px) clamp(16px, 3vw, 28px);
  background: var(--panel);
  border-top: var(--about-rule);
  border-bottom: var(--about-rule);
}

/* ---------- 合作节点 ---------- */
.page-about .about-net {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-net__node {
  position: relative;
  padding: 0 0 22px 26px;
}

.page-about .about-net__node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 1.5px solid var(--line);
  box-shadow: 0 0 0 3px rgba(184, 255, 61, 0.08);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-net__node::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 18px;
  bottom: 4px;
  width: 1px;
  background: var(--line);
}

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

.page-about .about-net__node:last-child::after {
  display: none;
}

.page-about .about-net__node:hover::before,
.page-about .about-net__node:focus-within::before {
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .about-net__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0;
}

.page-about .about-net__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-net__title {
  font-size: 16px;
  font-weight: 500;
  color: var(--paper);
}

.page-about .about-net__desc {
  margin: 5px 0 0;
  max-width: 46ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  transition: color var(--dur) var(--ease);
}

.page-about .about-net__node:hover .about-net__desc {
  color: var(--body-soft);
}

/* ---------- 岗位表 ---------- */
.page-about .about-table-wrap {
  margin-top: 18px;
  overflow-x: auto;
  border: var(--about-rule);
  -webkit-overflow-scrolling: touch;
}

.page-about .about-table {
  width: 100%;
  min-width: 540px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
  line-height: 1.65;
}

.page-about .about-table thead th {
  background: var(--panel);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}

.page-about .about-table td {
  color: var(--body-soft);
}

.page-about .about-table td:first-child {
  color: var(--paper);
  font-weight: 500;
  white-space: nowrap;
}

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

/* ---------- 里程碑 ---------- */
.page-about .about-marks {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--about-rule);
}

.page-about .about-marks li {
  display: grid;
  gap: 4px 18px;
  padding: 14px 0;
  border-bottom: var(--about-rule);
}

.page-about .about-marks__when {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .about-marks p {
  margin: 0;
  max-width: none;
  font-size: 15px;
  line-height: 1.7;
  color: var(--body-soft);
}

/* ---------- 收尾入口 ---------- */
.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-about .about-outro {
  padding-bottom: clamp(40px, 6vw, 72px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .about-marks li {
    grid-template-columns: 132px minmax(0, 1fr);
    align-items: baseline;
  }
}

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 920px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-chapter {
    padding-top: clamp(30px, 3.4vw, 44px);
    padding-bottom: clamp(30px, 3.4vw, 44px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__item::before,
  .page-about .about-net__node::before,
  .page-about .about-net__desc {
    transition: none;
  }
}