.page-about {
  --about-rail-w: 228px;
  --about-soft: rgba(44, 245, 212, 0.1);
  --about-body: rgba(217, 237, 231, 0.82);
  padding-bottom: clamp(48px, 7vw, 96px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4.6vw, 52px) 0 clamp(34px, 5.4vw, 68px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(880px 460px at 84% 8%, rgba(44, 245, 212, 0.13), transparent 70%),
    linear-gradient(180deg, rgba(15, 42, 36, 0.92), rgba(10, 15, 13, 0) 68%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(168, 255, 233, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(168, 255, 233, 0.055) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 86%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 86%);
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-hero__copy h1 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-size: clamp(34px, 5.8vw, 60px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: 0.01em;
  color: var(--text);
}

.page-about .about-hero__copy .lede {
  margin-top: 16px;
  max-width: 58ch;
  color: var(--about-body);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 14px 0 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.page-about .about-hero__facts b {
  display: inline-block;
  margin-right: 6px;
  font-size: 16px;
  font-weight: 600;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-lg) 0 var(--r-lg) var(--r-lg);
  background: var(--board);
  clip-path: polygon(0 0, 100% 0, 100% 92%, 92% 100%, 0 100%);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  filter: saturate(0.94) contrast(1.04);
}

.page-about .about-hero__cap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  padding: 12px 16px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  border-top: 1px solid var(--line-soft);
  background: rgba(10, 15, 13, 0.55);
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
  padding-top: clamp(30px, 5vw, 62px);
}

/* ---------- 左侧粘性目录 ---------- */
.page-about .about-rail {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(18, 59, 50, 0.42);
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  padding-left: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 2px 2px;
  list-style: none;
}

.page-about .about-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 12px;
  border-radius: var(--r-sm);
  font-size: 14px;
  line-height: 1.4;
  white-space: nowrap;
  text-decoration: none;
  color: var(--muted);
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  background: var(--about-soft);
  color: var(--mint);
}

.page-about .about-rail__year {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  opacity: 0.85;
}

/* ---------- 章节 ---------- */
.page-about .about-column {
  min-width: 0;
}

.page-about .about-sec {
  scroll-margin-top: 96px;
  padding: 0 0 clamp(32px, 4.6vw, 56px);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-sec + .about-sec {
  padding-top: clamp(32px, 4.6vw, 56px);
}

.page-about .about-sec__head h2 {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-size: clamp(24px, 3.6vw, 36px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: 0.01em;
  color: var(--text);
}

.page-about .about-sec p {
  max-width: 64ch;
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--about-body);
}

/* ---------- 摘要卡 ---------- */
.page-about .about-notes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-note {
  position: relative;
  padding: 20px 16px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(158deg, rgba(18, 59, 50, 0.88), rgba(10, 15, 13, 0.32));
}

.page-about .about-note::after {
  content: "";
  position: absolute;
  top: 14px;
  right: 14px;
  width: 18px;
  height: 18px;
  border-top: 1px solid var(--cyan);
  border-right: 1px solid var(--cyan);
  opacity: 0.45;
}

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

.page-about .about-note h3 {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 700;
  color: var(--mint);
}

.page-about .about-note p {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 数据条 ---------- */
.page-about .about-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 26px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--line);
}

.page-about .about-band__cell {
  padding: 18px 16px;
  background: rgba(15, 42, 36, 0.94);
}

.page-about .about-band__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 34px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-band__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 团队标签页 ---------- */
.page-about .about-tabs {
  position: relative;
  margin-top: 24px;
}

.page-about .about-tabs__input {
  position: absolute;
  top: 0;
  left: 0;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .about-tabs__labels {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-tabs__label {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 14px;
  color: var(--muted);
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-tabs__label:hover {
  border-color: rgba(44, 245, 212, 0.45);
  color: var(--mint);
}

.page-about #about-tab-edit:checked ~ .about-tabs__labels label[for="about-tab-edit"],
.page-about #about-tab-data:checked ~ .about-tabs__labels label[for="about-tab-data"],
.page-about #about-tab-design:checked ~ .about-tabs__labels label[for="about-tab-design"],
.page-about #about-tab-support:checked ~ .about-tabs__labels label[for="about-tab-support"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #06231e;
  font-weight: 600;
}

.page-about #about-tab-edit:focus-visible ~ .about-tabs__labels label[for="about-tab-edit"],
.page-about #about-tab-data:focus-visible ~ .about-tabs__labels label[for="about-tab-data"],
.page-about #about-tab-design:focus-visible ~ .about-tabs__labels label[for="about-tab-design"],
.page-about #about-tab-support:focus-visible ~ .about-tabs__labels label[for="about-tab-support"] {
  outline: 2px solid var(--mint);
  outline-offset: 2px;
}

.page-about .about-tabs__panels {
  margin-top: 16px;
}

.page-about .about-tabs__panel {
  display: none;
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: rgba(15, 42, 36, 0.62);
}

.page-about #about-tab-edit:checked ~ .about-tabs__panels [data-tab="edit"],
.page-about #about-tab-data:checked ~ .about-tabs__panels [data-tab="data"],
.page-about #about-tab-design:checked ~ .about-tabs__panels [data-tab="design"],
.page-about #about-tab-support:checked ~ .about-tabs__panels [data-tab="support"] {
  display: block;
}

.page-about .about-tabs__panel h3 {
  margin: 0;
  font-family: var(--font-head);
  font-size: 21px;
  font-weight: 700;
  color: var(--mint);
}

.page-about .about-tabs__panel p {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-body);
}

.page-about .about-tabs__panel ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tabs__panel li {
  padding: 5px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  color: var(--muted);
  background: rgba(10, 15, 13, 0.4);
}

.page-about .about-advisor {
  margin-top: 20px;
  padding: 14px 16px;
  border-left: 2px solid var(--yellow);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: rgba(242, 209, 75, 0.07);
  font-size: 14px;
  line-height: 1.78;
  color: var(--about-body);
}

/* ---------- 四层结构 ---------- */
.page-about .about-layers-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  margin-top: 24px;
}

.page-about .about-layer {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(15, 42, 36, 0.5);
  padding: 0 16px;
}

.page-about .about-layer + .about-layer {
  margin-top: 10px;
}

.page-about .about-layer summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
  padding: 15px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-layer summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--cyan);
}

.page-about .about-layer[open] summary::after {
  content: "−";
}

.page-about .about-layer__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-layer__name {
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-layer__meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .about-layer p {
  margin: 0 0 16px;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .about-figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--board);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 7;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.05);
}

.page-about .about-figure figcaption {
  padding: 10px 14px 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
  border-top: 1px solid var(--line-soft);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-time {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-time li {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-time li:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-time__year {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
  padding-top: 2px;
}

.page-about .about-time h3 {
  margin: 0;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-time p {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 合作与认可 ---------- */
.page-about .about-partner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  margin-top: 24px;
}

.page-about .about-partner__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  align-content: start;
}

.page-about .about-partner__stats li {
  padding: 16px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: rgba(18, 59, 50, 0.66);
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-partner__num {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 600;
  line-height: 1.1;
  color: var(--mint);
  font-variant-numeric: tabular-nums;
}

.page-about .about-partner__figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--board);
}

.page-about .about-partner__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.06);
}

.page-about .about-partner__figure figcaption {
  padding: 10px 14px 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
  border-top: 1px solid var(--line-soft);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(32px, 4.6vw, 56px);
  padding: clamp(24px, 3.6vw, 40px) clamp(18px, 3vw, 34px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background:
    linear-gradient(135deg, rgba(44, 245, 212, 0.12), rgba(124, 92, 255, 0.1) 58%, transparent 100%),
    rgba(15, 42, 36, 0.78);
}

.page-about .about-cta h2 {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 800;
  line-height: 1.16;
  color: var(--text);
}

.page-about .about-cta p {
  max-width: 60ch;
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-about .about-cta__note {
  margin-top: 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-cta__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(44, 245, 212, 0.4);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-notes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 860px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: end;
  }

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

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

  .page-about .about-layers-wrap {
    grid-template-columns: minmax(0, 1.22fr) minmax(0, 0.78fr);
    align-items: start;
  }

  .page-about .about-partner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    align-items: start;
  }

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

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 92px;
    overflow-x: visible;
  }

  .page-about .about-rail__list {
    display: block;
    padding: 0;
  }

  .page-about .about-rail__list li + li {
    margin-top: 2px;
  }

  .page-about .about-rail__list a {
    white-space: normal;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__list a,
  .page-about .about-tabs__label {
    transition: none;
  }
}