.page-about {
  --about-rail: rgba(30, 90, 138, 0.45);
  --about-soft: rgba(245, 241, 234, 0.74);
  --about-soft-ink: rgba(20, 32, 43, 0.76);
  background: var(--deep-900);
  color: var(--warm);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-heading);
  font-weight: 800;
}

.page-about .mono-index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--sea-500);
}

.page-about a {
  text-underline-offset: 3px;
}

.page-about a:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 36px) 0 52px;
  background:
    radial-gradient(115% 88% at 88% -6%, rgba(30, 90, 138, 0.58) 0%, rgba(6, 24, 46, 0) 62%),
    radial-gradient(80% 60% at 4% 100%, rgba(75, 224, 208, 0.09) 0%, rgba(6, 24, 46, 0) 70%),
    var(--deep-900);
}

.page-about .about-hero__inner {
  display: grid;
  gap: 34px;
  align-items: center;
}

.page-about h1 {
  margin: 14px 0 0;
  font-size: clamp(28px, 6.4vw, 52px);
  line-height: 1.18;
  letter-spacing: -0.012em;
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--about-soft);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 30px;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .about-hero__facts > div {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 14px;
  border-left: 2px solid var(--race);
}

.page-about .about-hero__facts > div:nth-child(2) {
  border-left-color: var(--sea-500);
}

.page-about .about-hero__facts > div:nth-child(3) {
  border-left-color: var(--neon);
}

.page-about .about-hero__facts dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--graphite);
}

.page-about .about-hero__facts dd {
  margin: 0;
  font-family: var(--font-display);
  font-size: 25px;
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--warm);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

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

.page-about .figure__frame {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--about-rail);
  background: linear-gradient(145deg, var(--deep-700), var(--deep-800));
}

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

.page-about .figure__caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--graphite);
}

/* ---------- 章节标题 ---------- */

.page-about .about-sec-head {
  max-width: 76ch;
  margin-bottom: 38px;
}

.page-about .about-sec-head h2 {
  margin: 10px 0 0;
  font-size: clamp(23px, 3.4vw, 34px);
  line-height: 1.3;
}

.page-about .about-sec-head p {
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--about-soft);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline__layout {
  display: grid;
  gap: 26px;
}

.page-about .about-tl-nav__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-tl-nav__list li {
  flex: 0 0 auto;
}

.page-about .about-tl-nav__list a {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  background: rgba(19, 57, 95, 0.4);
  color: var(--graphite);
  font-size: 13.5px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 160ms var(--ease), background 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-tl-nav__list a:hover {
  color: var(--warm);
  border-color: var(--about-rail);
  background: rgba(19, 57, 95, 0.72);
}

.page-about .about-tl-nav__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--sea-500);
}

.page-about .about-tl-body {
  position: relative;
  display: grid;
  gap: 22px;
}

.page-about .about-node {
  position: relative;
  padding: 22px 20px 24px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(30, 90, 138, 0.42);
  background: linear-gradient(152deg, rgba(19, 57, 95, 0.52), rgba(12, 37, 66, 0.78));
  transition: border-color 160ms var(--ease), background 160ms var(--ease);
}

.page-about .about-node:hover {
  border-color: rgba(59, 135, 191, 0.72);
  background: linear-gradient(152deg, rgba(30, 90, 138, 0.44), rgba(12, 37, 66, 0.86));
}

.page-about .about-node--current {
  border-color: rgba(255, 106, 26, 0.52);
  background: linear-gradient(152deg, rgba(255, 106, 26, 0.1), rgba(12, 37, 66, 0.85));
}

.page-about .about-node__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 12px;
}

.page-about .about-node__ver {
  font-family: var(--font-display);
  font-size: 30px;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--sea-500);
}

.page-about .about-node--current .about-node__ver {
  color: var(--race);
}

.page-about .about-node h3 {
  margin: 0 0 12px;
  font-size: clamp(18px, 2.6vw, 22px);
  line-height: 1.4;
}

.page-about .about-node > p {
  margin: 0;
  font-size: 15px;
  line-height: 1.88;
  color: var(--about-soft);
}

.page-about .about-node__list {
  display: grid;
  gap: 9px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-node__list li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--warm);
}

.page-about .about-node__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 9px;
  height: 2px;
  background: var(--neon);
}

/* ---------- 对照表 ---------- */

.page-about .about-compare-figure {
  margin: 0 0 34px;
}

.page-about .about-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-md);
  border: 1px solid rgba(30, 90, 138, 0.42);
  background: rgba(6, 24, 46, 0.62);
}

.page-about .about-table {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
  font-size: 14.5px;
}

.page-about .about-table__caption {
  padding: 14px 16px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--graphite);
  border-bottom: 1px solid rgba(30, 90, 138, 0.32);
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
  line-height: 1.7;
  border-bottom: 1px solid rgba(30, 90, 138, 0.24);
}

.page-about .about-table thead th {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--graphite);
  background: rgba(19, 57, 95, 0.5);
}

.page-about .about-table tbody th {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--sea-500);
  white-space: nowrap;
}

.page-about .about-table tbody tr:nth-child(even) {
  background: rgba(19, 57, 95, 0.24);
}

.page-about .about-table tbody tr:hover {
  background: rgba(30, 90, 138, 0.38);
}

.page-about .about-table tbody tr.is-current {
  background: var(--race-soft);
}

.page-about .about-table tbody tr.is-current th {
  color: var(--race);
}

.page-about .about-table tbody tr.is-current:hover {
  background: rgba(255, 106, 26, 0.19);
}

.page-about .about-table tbody tr:last-child th,
.page-about .about-table tbody tr:last-child td {
  border-bottom: none;
}

.page-about .about-compare__foot {
  margin: 26px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-soft);
}

.page-about .about-compare__foot a {
  color: var(--sea-500);
  font-weight: 600;
}

/* ---------- 暖白阅读区：团队 ---------- */

.page-about .section--warm {
  background: var(--warm);
  color: var(--ink);
}

.page-about .section--warm .about-sec-head p {
  color: var(--about-soft-ink);
}

.page-about .section--warm .mono-index {
  color: var(--deep-600);
}

.page-about .section--warm .figure__frame {
  border-color: rgba(20, 32, 43, 0.16);
  background: linear-gradient(145deg, #dde5ec, #eef1f4);
}

.page-about .section--warm .figure__caption {
  color: rgba(20, 32, 43, 0.6);
}

.page-about .about-team {
  display: grid;
  gap: 30px;
  align-items: start;
}

.page-about .about-role-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(20, 32, 43, 0.16);
}

.page-about .about-role {
  display: grid;
  gap: 7px;
  padding: 20px 0 20px 18px;
  border-bottom: 1px solid rgba(20, 32, 43, 0.16);
  border-left: 3px solid transparent;
  transition: border-color 160ms var(--ease), background 160ms var(--ease);
}

.page-about .about-role:hover {
  border-left-color: var(--race);
  background: rgba(255, 106, 26, 0.06);
}

.page-about .about-role h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-role p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--about-soft-ink);
}

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

/* ---------- 内容节奏 ---------- */

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

.page-about .about-cad-card {
  position: relative;
  overflow: hidden;
  padding: 24px 20px 22px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(30, 90, 138, 0.42);
  background: linear-gradient(160deg, rgba(19, 57, 95, 0.55), rgba(12, 37, 66, 0.82));
  transition: border-color 160ms var(--ease);
}

.page-about .about-cad-card:hover {
  border-color: rgba(75, 224, 208, 0.42);
}

.page-about .about-cad-card::after {
  content: "";
  position: absolute;
  left: -34px;
  bottom: -46px;
  width: 128px;
  height: 128px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--neon-soft) 0%, rgba(75, 224, 208, 0) 70%);
  pointer-events: none;
}

.page-about .about-cad-card__num {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--sea-500);
}

.page-about .about-cad-card h3 {
  margin: 0 0 10px;
  font-size: 18px;
  line-height: 1.4;
}

.page-about .about-cad-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--about-soft);
}

.page-about .about-cadence__foot {
  margin: 30px 0 0;
}

/* ---------- 迁移疑问 ---------- */

.page-about .about-faq {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(30, 90, 138, 0.4);
}

.page-about .about-faq__item {
  padding: 22px 0;
  border-bottom: 1px solid rgba(30, 90, 138, 0.4);
}

.page-about .about-faq__item h3 {
  margin: 0 0 10px;
  font-size: 17px;
  line-height: 1.55;
  font-weight: 700;
}

.page-about .about-faq__item p {
  margin: 0;
  max-width: 76ch;
  font-size: 15px;
  line-height: 1.88;
  color: var(--about-soft);
}

.page-about .about-faq__more {
  margin: 28px 0 0;
  font-size: 15px;
  line-height: 1.88;
  color: var(--about-soft);
}

.page-about .about-faq__more a {
  color: var(--sea-500);
  font-weight: 600;
}

/* ---------- 页脚锚点说明 ---------- */

.page-about .about-anchor-note {
  position: relative;
  overflow: hidden;
  padding: 30px 24px 32px;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(30, 90, 138, 0.5);
  background: linear-gradient(125deg, rgba(19, 57, 95, 0.66), rgba(6, 24, 46, 0.92));
}

.page-about .about-anchor-note::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--race) 0%, var(--neon) 100%);
}

.page-about .about-anchor-note h2 {
  margin: 10px 0 0;
  font-size: clamp(21px, 3vw, 28px);
  line-height: 1.35;
}

.page-about .about-anchor-note p {
  margin: 14px 0 0;
  max-width: 72ch;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--about-soft);
}

.page-about .about-anchor-note .btn {
  margin-top: 22px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-cadence {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-node {
    padding: 26px 26px 28px;
  }

  .page-about .about-anchor-note {
    padding: 38px 34px 40px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 68px) 0 82px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.04fr);
    gap: 52px;
  }

  .page-about .about-hero__lede {
    font-size: 16.5px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 1fr);
    gap: 46px;
  }

  .page-about .about-sec-head {
    margin-bottom: 44px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-timeline__layout {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 54px;
  }

  .page-about .about-tl-nav {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .about-tl-nav__list {
    flex-direction: column;
    gap: 6px;
    padding: 0;
    overflow: visible;
  }

  .page-about .about-tl-nav__list a {
    background: transparent;
    padding: 11px 14px;
  }

  .page-about .about-tl-body {
    gap: 26px;
    padding-left: 40px;
  }

  .page-about .about-tl-body::before {
    content: "";
    position: absolute;
    left: 11px;
    top: 10px;
    bottom: 10px;
    width: 2px;
    border-radius: 2px;
    background: linear-gradient(180deg, var(--race) 0%, var(--deep-600) 30%, var(--deep-700) 100%);
  }

  .page-about .about-node::before {
    content: "";
    position: absolute;
    left: -35px;
    top: 32px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--deep-900);
    border: 2px solid var(--sea-500);
  }

  .page-about .about-node--current::before {
    background: var(--race);
    border-color: var(--race);
    box-shadow: 0 0 0 5px var(--race-soft);
  }
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}