.page-about {
  background: var(--ink-900);
  color: var(--paper);
  padding-bottom: 0;
}

.page-about .breadcrumb {
  padding-top: 20px;
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 28px 0 48px;
  background:
    radial-gradient(120% 90% at 12% 0%, rgba(43, 224, 208, 0.14), transparent 62%),
    radial-gradient(80% 70% at 92% 18%, rgba(58, 35, 80, 0.6), transparent 70%),
    repeating-linear-gradient(90deg, rgba(242, 247, 250, 0.05) 0 1px, transparent 1px 96px),
    var(--ink-900);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__inner {
  display: grid;
  gap: 32px;
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-32);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-hero__dek {
  margin: 16px 0 0;
  max-width: 40em;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-readout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-readout__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px;
  background: var(--ink-800);
}

.page-about .about-readout__num {
  font-family: var(--font-mono);
  font-size: var(--fs-32);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .about-readout__num small {
  font-size: var(--fs-14);
  margin-left: 2px;
  color: var(--mist);
}

.page-about .about-readout__num--gold {
  color: var(--gold);
}

.page-about .about-readout__label {
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--mist);
  letter-spacing: 0.04em;
}

/* ---------- 骨架：索引栏 + 正文 ---------- */
.page-about .about-shell {
  display: grid;
  gap: 28px;
  padding-top: 32px;
  padding-bottom: 56px;
}

.page-about .about-rail {
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  padding: 12px 0;
}

.page-about .about-rail__title {
  margin: 0 0 8px;
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 2px 4px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  white-space: nowrap;
  font-size: var(--fs-14);
  color: var(--mist);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: color var(--t-fast), border-color var(--t-fast), background-color var(--t-fast);
}

.page-about .about-rail__idx {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--gold);
  letter-spacing: 0.06em;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--paper);
  border-color: var(--line-strong);
  background: var(--ink-800);
}

.page-about .about-body {
  display: grid;
  gap: 40px;
  min-width: 0;
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  position: relative;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line-soft);
  min-width: 0;
}

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

.page-about .about-sec__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  margin-bottom: 20px;
}

.page-about .about-sec__num {
  font-family: var(--font-mono);
  font-size: var(--fs-24);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  opacity: 0.55;
  letter-spacing: 0.04em;
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-24);
  line-height: 1.28;
  color: var(--paper);
}

.page-about .about-sec__meta {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-lead {
  margin: 0 0 20px;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--paper);
}

.page-about .about-body p {
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-body p + p {
  margin-top: 14px;
}

.page-about .about-body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 224, 208, 0.35);
}

.page-about .about-body a:hover,
.page-about .about-body a:focus-visible {
  color: var(--gold);
  border-bottom-color: rgba(232, 180, 90, 0.6);
}

.page-about .about-cols {
  display: grid;
  gap: 24px;
}

.page-about .about-quote {
  margin: 0;
  padding: 18px 18px 16px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-18);
  line-height: 1.6;
  color: var(--paper);
}

.page-about .about-quote footer {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-note {
  font-size: var(--fs-14) !important;
  line-height: 1.85;
  color: var(--mist);
  border-left: 1px solid var(--line-strong);
  padding-left: 14px;
  margin: 18px 0 0;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 22px;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--mist);
  letter-spacing: 0.03em;
}

/* ---------- 权益对照表 ---------- */
.page-about .about-tablewrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
  box-shadow: var(--shadow-1);
}

.page-about .about-tablewrap:focus-visible {
  outline: 2px solid var(--coral);
  outline-offset: 2px;
}

.page-about .about-table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  font-size: var(--fs-14);
}

.page-about .about-table caption {
  text-align: left;
}

.page-about .about-table thead th {
  position: sticky;
  top: 0;
  z-index: 1;
  padding: 14px 12px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--gold);
  background: var(--ink-750);
  border-bottom: 1px solid var(--line-strong);
  white-space: nowrap;
}

.page-about .about-table thead th:first-child {
  color: var(--mist);
  font-family: var(--font-body);
  font-weight: 500;
}

.page-about .about-table__count {
  display: block;
  margin-top: 4px;
  font-size: var(--fs-12);
  color: var(--mist);
  letter-spacing: 0.04em;
}

.page-about .about-table tbody th {
  padding: 16px 12px;
  text-align: left;
  font-weight: 500;
  font-size: var(--fs-14);
  line-height: 1.6;
  color: var(--paper);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-table tbody td {
  padding: 16px 12px;
  border-bottom: 1px solid var(--line-soft);
  white-space: nowrap;
  transition: background-color var(--t-fast);
}

.page-about .about-table tbody tr {
  transition: background-color var(--t-fast);
}

.page-about .about-table tbody tr:hover {
  background: var(--ink-750);
}

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

.page-about .about-mark {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
}

.page-about .about-mark--on {
  color: var(--cyan);
}

.page-about .about-mark--off {
  color: var(--mist);
  opacity: 0.55;
}

/* ---------- 记录三步 ---------- */
.page-about .about-steps {
  display: grid;
  gap: 10px;
}

.page-about .about-step {
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  transition: border-color var(--t-fast);
}

.page-about .about-step:hover {
  border-color: var(--line-strong);
}

.page-about .about-step[open] {
  border-color: var(--line-strong);
}

.page-about .about-step__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-size: var(--fs-16);
  color: var(--paper);
}

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

.page-about .about-step__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--fs-18);
  color: var(--cyan);
}

.page-about .about-step[open] .about-step__summary::after {
  content: "−";
  color: var(--gold);
}

.page-about .about-step__summary:focus-visible {
  outline: 2px solid var(--coral);
  outline-offset: -2px;
  border-radius: var(--radius);
}

.page-about .about-step__idx {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .about-step__title {
  font-weight: 600;
}

.page-about .about-step__body {
  padding: 0 16px 16px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-step__body p {
  margin: 14px 0 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 14px;
  padding: 0 0 22px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 14px;
  bottom: -6px;
  width: 1px;
  background: var(--line);
}

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

.page-about .about-timeline__item:last-child::before {
  display: none;
}

.page-about .about-timeline__node {
  width: 11px;
  height: 11px;
  margin-top: 5px;
  margin-left: 5px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  background: var(--ink-900);
}

.page-about .about-timeline__item--current .about-timeline__node {
  border-color: var(--coral);
  background: var(--coral);
  box-shadow: 0 0 0 4px rgba(255, 111, 94, 0.16);
}

.page-about .about-timeline__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .about-timeline__title {
  margin: 4px 0 6px;
  font-family: var(--font-display);
  font-size: var(--fs-18);
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: var(--fs-14) !important;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 协作分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: 24px;
  min-width: 0;
}

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

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

.page-about .about-list li {
  position: relative;
  padding-left: 16px;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  opacity: 0.7;
}

.page-about .about-list strong {
  display: block;
  margin-bottom: 2px;
  color: var(--paper);
  font-weight: 600;
  font-size: var(--fs-14);
}

/* ---------- 页尾咨询带 ---------- */
.page-about .about-band {
  margin-top: 8px;
  background:
    radial-gradient(90% 120% at 88% 0%, rgba(43, 224, 208, 0.16), transparent 60%),
    var(--indigo);
  border-top: 1px solid var(--line-strong);
  padding: 36px 0 40px;
}

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

.page-about .about-band__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: var(--fs-24);
  font-weight: 700;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-band__text {
  margin: 12px 0 0;
  max-width: 42em;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-band__cards {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-band__card {
  padding: 16px 16px 18px;
  background: rgba(7, 26, 43, 0.55);
  transition: background-color var(--t-fast);
}

.page-about .about-band__card:hover {
  background: rgba(14, 42, 63, 0.85);
}

.page-about .about-band__k {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .about-band__card h3 {
  margin: 6px 0 6px;
  font-family: var(--font-display);
  font-size: var(--fs-16);
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-band__card p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-band__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-band__hours {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin: 0;
  font-size: var(--fs-12);
  line-height: 1.75;
  color: var(--mist);
  letter-spacing: 0.02em;
}

.page-about .about-band__hours .status-dot {
  margin-top: 6px;
  flex: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 40px 0 60px;
  }

  .page-about .about-hero h1 {
    font-size: var(--fs-48);
  }

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

  .page-about .about-body {
    gap: 48px;
  }

  .page-about .about-sec__title {
    font-size: var(--fs-32);
  }

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

  .page-about .about-timeline__item {
    grid-template-columns: 22px minmax(0, 1fr);
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
    gap: 40px;
  }

  .page-about .about-hero h1 {
    font-size: var(--fs-72);
    max-width: 15em;
  }

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

  .page-about .about-shell {
    grid-template-columns: 170px minmax(0, 1fr);
    gap: 48px;
    padding-top: 44px;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
    border-top: 1px solid var(--line);
    border-bottom: 0;
    padding: 14px 0 0;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-rail__link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    padding: 8px 0 8px 12px;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: transparent;
    border-left-color: var(--cyan);
  }

  .page-about .about-cols {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 32px;
    align-items: start;
  }

  .page-about .about-quote {
    margin-top: 4px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .about-split__figure {
    margin-top: 4px;
  }

  .page-about .about-band__inner {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: start;
    gap: 40px;
  }

  .page-about .about-band__lead {
    grid-row: 1 / span 1;
  }

  .page-about .about-band__cards {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-band__actions {
    grid-column: 1 / -1;
  }

  .page-about .about-band__hours {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1280px) {
  .page-about .about-shell {
    grid-template-columns: 200px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-table tbody tr,
  .page-about .about-table tbody td,
  .page-about .about-step,
  .page-about .about-band__card {
    transition: none;
  }
}