.page-about {
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: #FFFFFF;
  background: #1A0B2E;
  letter-spacing: 0.01em;
}

.page-about section[id] { scroll-margin-top: 84px; }

.page-about a { color: inherit; }

/* ===== hero ===== */
.about-hero {
  position: relative;
  padding: 44px 0 40px;
  background:
    radial-gradient(58% 72% at 82% 12%, rgba(255, 107, 53, 0.20) 0%, rgba(255, 107, 53, 0) 62%),
    radial-gradient(44% 58% at 8% 88%, rgba(57, 255, 20, 0.08) 0%, rgba(57, 255, 20, 0) 60%),
    #1A0B2E;
}
.about-hero::after {
  content: "";
  display: block;
  height: 4px;
  margin-top: 36px;
  border-radius: 999px;
  background: linear-gradient(90deg, #FF6B35 0%, #FFC837 34%, #39FF14 68%, #00E5FF 100%);
}
.about-crumbs { margin-bottom: 22px; }
.about-crumbs__list {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: #B0BEC5;
}
.about-crumbs__list a {
  color: #B0BEC5;
  text-decoration: none;
  transition: color 0.2s ease;
}
.about-crumbs__list a:hover { color: #39FF14; }
.about-crumbs__list li[aria-current="page"] { color: #FFC837; }
.about-hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  padding: 7px 14px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: #B0BEC5;
}
.about-hero__badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #39FF14;
  animation: aboutPulse 2s ease-in-out infinite;
}
@keyframes aboutPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(57, 255, 20, 0.55); }
  50% { box-shadow: 0 0 0 7px rgba(57, 255, 20, 0); }
}
.about-hero__title {
  margin: 0 0 16px;
  font-size: clamp(26px, 6vw, 44px);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: 0.01em;
}
.about-hero__lead {
  max-width: 780px;
  margin: 0 0 24px;
  font-size: 15px;
  line-height: 1.8;
  color: #B0BEC5;
}
.about-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.about-hero__chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  font-size: 13px;
  color: #FFFFFF;
}
.about-hero__chip b {
  font-family: var(--font-mono);
  font-weight: 700;
  color: #FFC837;
}
.about-hero__chip:first-child b { color: #00E5FF; }
.about-hero__chip:nth-child(2) b { color: #39FF14; }

/* ===== 锚点导航 ===== */
.about-anchor {
  padding: 12px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(26, 11, 46, 0.92);
}
.about-anchor .container {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}
.about-anchor .container::-webkit-scrollbar { display: none; }
.about-anchor__item {
  flex: 0 0 auto;
  padding: 8px 14px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: #B0BEC5;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.about-anchor__item span { color: #FFC837; margin-right: 2px; }
.about-anchor__item:hover,
.about-anchor__item:focus {
  color: #39FF14;
  border-color: rgba(57, 255, 20, 0.65);
  background: rgba(57, 255, 20, 0.08);
}

/* ===== 章节通用 ===== */
.about-section { padding: 56px 0 64px; }
.about-sec-head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 16px;
  align-items: baseline;
  margin-bottom: 30px;
}
.about-sec-head__index {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.2;
  color: #39FF14;
}
.about-sec-head__title {
  margin: 0;
  font-size: 26px;
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: 0.01em;
}
.about-sec-head__lead {
  grid-column: 2;
  margin: 0;
  max-width: 680px;
  font-size: 14px;
  line-height: 1.7;
  color: #B0BEC5;
}

/* ===== 01 站点定位 ===== */
.about-positioning { background: #1A0B2E; }
.about-positioning__grid {
  display: grid;
  gap: 30px;
}
.about-positioning__text p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.88);
}
.about-positioning__text p:last-child { margin-bottom: 0; }
.about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.about-stat {
  position: relative;
  padding: 20px 16px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 24px;
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.22), rgba(26, 11, 46, 0.55));
  overflow: hidden;
  transition: transform 0.2s ease, border-color 0.2s ease;
}
.about-stat:nth-child(2n) { background: linear-gradient(135deg, rgba(255, 200, 55, 0.18), rgba(26, 11, 46, 0.55)); }
.about-stat:nth-child(3n) { transform: rotate(0.5deg); }
.about-stat:nth-child(4n) { transform: rotate(-0.5deg); }
.about-stat:hover {
  transform: translateY(-3px) rotate(0deg);
  border-color: #39FF14;
}
.about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  color: #FF6B35;
}
.about-stat:nth-child(2n) .about-stat__num,
.about-stat:nth-child(3n) .about-stat__num { color: #FFC837; }
.about-stat:nth-child(4n) .about-stat__num { color: #FF3E9E; }
.about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: #B0BEC5;
}

/* ===== 02 收录范围 ===== */
.about-scope { background: linear-gradient(140deg, #2B0A1A 0%, #4A0D1B 100%); }
.about-scope .about-sec-head__index { color: #FF3E9E; }
.about-scope__layout {
  display: grid;
  gap: 22px;
  align-items: start;
}
.about-scope-table-wrap {
  overflow-x: auto;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 24px;
  background: rgba(26, 11, 46, 0.55);
}
.about-scope-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
}
.about-scope-table th {
  padding: 14px 16px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  white-space: nowrap;
  color: #1A0B2E;
  background: #FFC837;
}
.about-scope-table td {
  padding: 12px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 13px;
  color: #FFFFFF;
}
.about-scope-table tbody tr { transition: background 0.2s ease; }
.about-scope-table tbody tr:hover { background: rgba(255, 107, 53, 0.14); }
.about-scope-table tbody tr:last-child td { border-bottom: none; }
.about-scope-table__index {
  margin-right: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: #FF3E9E;
}
.about-scope-table td:nth-child(2) {
  font-family: var(--font-mono);
  font-weight: 700;
  color: #39FF14;
}
.about-scope-table td:last-child {
  white-space: normal;
  color: #B0BEC5;
}
.about-scope__figure {
  margin: 0;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 24px;
  overflow: hidden;
  background: #0D1B2A;
}
.about-scope__figure img {
  display: block;
  width: 100%;
  height: auto;
}
.about-scope__figure figcaption {
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: #B0BEC5;
}

/* ===== 03 分类体系 ===== */
.about-taxonomy { background: #1A0B2E; }
.about-taxonomy .about-sec-head__index { color: #FFC837; }
.about-taxonomy__tree {
  position: relative;
  padding: 26px 18px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 24px;
  background: rgba(43, 10, 26, 0.60);
  overflow: hidden;
}
.about-taxonomy__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.22;
  pointer-events: none;
}
.about-taxonomy__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.about-tree-layer { position: relative; z-index: 1; }
.about-tree-layer + .about-tree-layer { margin-top: 24px; }
.about-tree-layer__label {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: #00E5FF;
}
.about-tree-layer__label b {
  font-size: 15px;
  color: #FFC837;
}
.about-tree-l1 {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.about-tree-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 999px;
  background: rgba(255, 107, 53, 0.12);
  font-size: 13px;
  font-weight: 700;
  color: #FFFFFF;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.about-tree-chip:hover {
  border-color: #39FF14;
  transform: translateY(-1px);
}
.about-tree-chip em {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: #00E5FF;
}
.about-tree-chip:nth-child(3n) { background: rgba(255, 200, 55, 0.12); }
.about-tree-chip:nth-child(3n) em { color: #FFC837; }
.about-tree-chip:nth-child(4n) { border-color: rgba(57, 255, 20, 0.34); }
.about-tree-l2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
.about-tree-branch {
  padding: 13px 12px;
  border: 1px solid rgba(255, 255, 255, 0.10);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.04);
  transition: border-color 0.2s ease, background 0.2s ease;
}
.about-tree-branch:hover {
  border-color: #39FF14;
  background: rgba(57, 255, 20, 0.07);
}
.about-tree-branch__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}
.about-tree-branch__name {
  font-size: 13px;
  font-weight: 800;
  color: #FF6B35;
}
.about-tree-branch:nth-child(3n) .about-tree-branch__name { color: #FFC837; }
.about-tree-branch:nth-child(4n) .about-tree-branch__name { color: #FF3E9E; }
.about-tree-branch__count {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  color: #00E5FF;
}
.about-tree-branch__subs {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}
.about-tree-branch__sub {
  padding: 3px 9px;
  border-radius: 999px;
  background: rgba(176, 190, 197, 0.08);
  font-size: 12px;
  color: #B0BEC5;
}
.about-tag-sample {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.about-tag-sample__tag {
  padding: 5px 11px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.07);
  font-size: 12px;
  color: #FFFFFF;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.about-tag-sample__tag:hover {
  transform: translateY(-2px) rotate(-1deg);
  background: #39FF14;
  border-color: #39FF14;
  color: #1A0B2E;
}
.about-tag-sample__tag:nth-child(3n) { background: rgba(255, 62, 158, 0.14); border-color: rgba(255, 62, 158, 0.26); }
.about-tag-sample__tag:nth-child(4n) { background: rgba(0, 229, 255, 0.10); border-color: rgba(0, 229, 255, 0.24); }
.about-tag-sample__tag:nth-child(5n) { background: rgba(255, 200, 55, 0.12); border-color: rgba(255, 200, 55, 0.28); }
.about-tag-sample__tag:nth-child(1),
.about-tag-sample__tag:nth-child(2),
.about-tag-sample__tag:nth-child(5),
.about-tag-sample__tag:nth-child(7),
.about-tag-sample__tag:nth-child(8),
.about-tag-sample__tag:nth-child(18) {
  font-size: 14px;
  font-weight: 800;
}

/* ===== 04 版本演进 ===== */
.about-versions {
  background: linear-gradient(150deg, #4A0D1B 0%, #2B0A1A 55%, #1A0B2E 100%);
}
.about-versions .about-sec-head__index { color: #FF6B35; }
.about-versions__layout {
  display: grid;
  gap: 26px;
  align-items: center;
}
.about-timeline {
  position: relative;
  margin: 0;
  padding-left: 30px;
}
.about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  border-radius: 999px;
  background: linear-gradient(180deg, #39FF14 0%, #FF3E9E 50%, #FFC837 100%);
}
.about-timeline__item { position: relative; margin-bottom: 20px; }
.about-timeline__item:last-child { margin-bottom: 0; }
.about-timeline__node {
  position: absolute;
  left: -5px;
  top: 20px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #39FF14;
  border: 4px solid #2B0A1A;
  box-shadow: 0 0 0 2px #39FF14;
}
.about-timeline__item:nth-child(2) .about-timeline__node {
  background: #FF3E9E;
  box-shadow: 0 0 0 2px #FF3E9E;
}
.about-timeline__item:nth-child(3) .about-timeline__node {
  background: #FFC837;
  box-shadow: 0 0 0 2px #FFC837;
}
.about-timeline__card {
  margin-left: 20px;
  padding: 18px 20px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.05);
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.about-timeline__card:hover {
  border-color: #39FF14;
  transform: translateX(4px);
}
.about-timeline__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}
.about-timeline__meta h3 {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 19px;
  letter-spacing: 0.02em;
}
.about-timeline__tag {
  padding: 3px 10px;
  border: 1px solid rgba(255, 62, 158, 0.34);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: #FF3E9E;
}
.about-timeline__tag--current {
  border-color: rgba(57, 255, 20, 0.40);
  color: #39FF14;
}
.about-timeline__item:nth-child(3) .about-timeline__tag {
  border-color: rgba(255, 200, 55, 0.34);
  color: #FFC837;
}
.about-timeline__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: #B0BEC5;
}
.about-versions__figure {
  margin: 0;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 24px;
  overflow: hidden;
}
.about-versions__figure img {
  display: block;
  width: 100%;
  height: auto;
}
.about-versions__figure figcaption {
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: #B0BEC5;
}

/* ===== 05 更新机制与引导入口 ===== */
.about-guide { background: #0D1B2A; }
.about-guide .about-sec-head__index { color: #00E5FF; }
.about-guide__grid {
  display: grid;
  gap: 22px;
}
.about-guide__facts {
  padding: 6px 20px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.04);
}
.about-guide__fact-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 15px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}
.about-guide__fact-row:last-child { border-bottom: none; }
.about-guide__fact-row span {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: #B0BEC5;
}
.about-guide__fact-row strong {
  font-size: 15px;
  font-weight: 800;
  color: #FFFFFF;
}
.about-guide__fact-row:nth-child(2) strong { color: #FFC837; }
.about-guide__fact-row:nth-child(3) strong { color: #00E5FF; }
.about-guide__fact-row:nth-child(4) strong { color: #39FF14; }
.about-guide__entries {
  display: grid;
  gap: 12px;
}
.about-guide-entry {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 20px;
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.18), rgba(255, 200, 55, 0.08));
  text-decoration: none;
  color: #FFFFFF;
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}
.about-guide-entry:hover {
  border-color: #39FF14;
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(57, 255, 20, 0.10);
}
.about-guide-entry::after {
  content: "→";
  margin-left: auto;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 18px;
  color: #39FF14;
}
.about-guide-entry__icon {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 14px;
  background: rgba(26, 11, 46, 0.55);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: #FFC837;
}
.about-guide-entry__text {
  flex: 1;
  display: grid;
  gap: 3px;
  min-width: 0;
}
.about-guide-entry__text strong {
  font-size: 15px;
  font-weight: 800;
}
.about-guide-entry__text span {
  font-size: 12px;
  line-height: 1.5;
  color: #B0BEC5;
}

@media (hover: none) {
  .about-stat:hover { transform: none; }
  .about-tree-branch:hover {
    background: rgba(255, 255, 255, 0.04);
    border-color: rgba(255, 255, 255, 0.10);
  }
}

/* ===== 响应式 ===== */
@media (min-width: 768px) {
  .about-hero { padding: 60px 0 52px; }
  .about-hero__title { font-size: 38px; }
  .about-hero__lead { font-size: 16px; }
  .about-section { padding: 72px 0 84px; }
  .about-sec-head__title { font-size: 30px; }
  .about-positioning__grid {
    grid-template-columns: 1.35fr 1fr;
    gap: 40px;
    align-items: start;
  }
  .about-stats { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .about-scope__layout { grid-template-columns: 1fr 300px; }
  .about-tree-l2 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .about-versions__layout { grid-template-columns: 1fr 320px; }
  .about-guide__grid { grid-template-columns: 1fr 1.1fr; gap: 32px; }
}

@media (min-width: 1024px) {
  .about-hero { padding: 80px 0 68px; }
  .about-hero__title { font-size: 44px; }
  .about-hero__lead { font-size: 17px; }
  .about-section { padding: 88px 0 100px; }
  .about-tree-l2 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .about-versions__layout { grid-template-columns: 1fr 380px; }
}