/* =========================================================
   站点说明页 /site-info/
   作用域：.page-about
   ========================================================= */
.page-about {
  --about-a: #D5006D;
  --about-b: #FF7A00;
  --about-c: #00C9A7;
  --about-pink: #FF6EC7;
  --about-blue: #00E5FF;
  --about-ink: #1A1A1A;
  --about-invert: #FFFFFF;
  --about-muted: #666666;
  background: var(--bg-base);
  color: var(--ink-invert);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 30px 0 52px;
  background: var(--bg-base);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 15% 20%, rgba(213, 0, 109, .38), transparent 46%),
    radial-gradient(ellipse at 85% 15%, rgba(0, 229, 255, .22), transparent 36%),
    radial-gradient(ellipse at 60% 80%, rgba(255, 122, 0, .14), transparent 30%);
  pointer-events: none;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--about-a), var(--about-b), var(--about-c), var(--about-pink), var(--about-blue));
}
.page-about .about-hero-grid {
  position: relative;
  display: grid;
  gap: 24px;
}
.page-about .about-hero-main {
  margin-top: 20px;
}
.page-about .about-hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  padding: 6px 12px 6px 10px;
  background: rgba(255, 255, 255, .06);
  border-left: 3px solid var(--about-pink);
  font: 500 12px var(--font-mono);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--about-pink);
}
.page-about .about-hero h1 {
  margin: 0 0 14px;
  font-family: var(--font-heading);
  font-size: clamp(34px, 7vw, 72px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--ink-invert);
  transform: skew(-3deg);
}
.page-about .about-hero h1 .hero-accent {
  display: block;
  background: linear-gradient(90deg, var(--about-a) 10%, var(--about-b) 50%, var(--about-c) 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.page-about .about-hero-desc {
  max-width: 780px;
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(255, 255, 255, .84);
}
.page-about .about-hero-desc strong {
  color: var(--about-pink);
  font-weight: 700;
}
.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .about-hero-side {
  position: absolute;
  top: 6px;
  right: 4px;
  display: none;
  flex-direction: column;
  gap: 12px;
}
.page-about .about-rotate-note {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  font: 500 11px/1.3 var(--font-mono);
  letter-spacing: .24em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, .42);
}
.page-about .about-rotate-note--c {
  color: var(--about-c);
}
.page-about .about-rotate-note--pink {
  color: var(--about-pink);
}

/* ---------- 首屏统计条 ---------- */
.page-about .about-stats {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 34px;
}
.page-about .stat-clip {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 86px;
  padding: 14px 16px 14px 18px;
  clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
}
.page-about .stat-clip--a {
  background: var(--about-a);
  color: var(--about-invert);
}
.page-about .stat-clip--b {
  background: var(--about-b);
  color: var(--about-ink);
}
.page-about .stat-clip--c {
  background: var(--about-c);
  color: var(--about-ink);
}
.page-about .stat-clip--pink {
  background: var(--about-pink);
  color: var(--about-ink);
}
.page-about .stat-clip--blue {
  background: var(--about-blue);
  color: var(--about-ink);
}
.page-about .stat-clip-label {
  margin-bottom: 2px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .1em;
  opacity: .75;
}
.page-about .stat-clip-value {
  font: 700 30px/1 var(--font-mono);
  letter-spacing: -0.02em;
}
.page-about .stat-clip-unit {
  margin-top: 4px;
  font-size: 11px;
  opacity: .72;
}

/* ---------- 区块共同 ---------- */
.page-about .about-section-head {
  display: flex;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 24px;
}
.page-about .about-section-head .section-title {
  margin-right: auto;
  color: inherit;
}
.page-about .about-section-head .section-note {
  flex-basis: 100%;
  color: inherit;
  opacity: .72;
}
.page-about .about-head-btn {
  margin-bottom: 4px;
}

/* ---------- 分类层级 ---------- */
.page-about .about-taxonomy {
  position: relative;
  overflow: hidden;
  padding: 72px 0 60px;
  background: var(--about-a);
  color: var(--about-invert);
}
.page-about .about-taxonomy::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: repeating-linear-gradient(45deg, rgba(255, 255, 255, .35) 0 8px, transparent 8px 16px);
}
.page-about .about-taxo-grid {
  display: grid;
  gap: 20px;
}
.page-about .taxo-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 18px;
  background: var(--card-bg);
  border-radius: 16px;
  box-shadow: var(--shadow);
  color: var(--ink);
  transition: transform var(--transition);
}
.page-about .taxo-card:hover {
  transform: translateY(-4px);
}
.page-about .taxo-card--a {
  border-left: 6px solid var(--line-a);
}
.page-about .taxo-card--b {
  border-left: 6px solid var(--line-b);
}
.page-about .taxo-card--c {
  border-left: 6px solid var(--line-c);
}
.page-about .taxo-card-img {
  display: block;
  width: 100%;
  aspect-ratio: 8 / 3;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: 14px;
}
.page-about .taxo-card-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}
.page-about .taxo-card-index {
  font: 700 28px var(--font-mono);
  line-height: 1;
  color: var(--about-a);
}
.page-about .taxo-card--b .taxo-card-index {
  color: var(--line-b);
}
.page-about .taxo-card--c .taxo-card-index {
  color: var(--line-c);
}
.page-about .taxo-card-head h3 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: 22px;
  color: var(--ink);
}
.page-about .taxo-card-total {
  margin-left: auto;
  font: 500 12px var(--font-mono);
  color: var(--ink-muted);
}
.page-about .taxo-tree {
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .taxo-tree li {
  position: relative;
  margin-left: 10px;
  padding-left: 16px;
}
.page-about .taxo-tree li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 21px;
  width: 10px;
  height: 2px;
  background: linear-gradient(90deg, var(--line-a), var(--line-b), var(--line-c));
}
.page-about .taxo-tree a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 11px 4px;
  border-bottom: 1px dashed #E8E8E8;
  color: var(--ink);
  font-size: 15px;
  text-decoration: none;
  transition: color .18s ease, padding-left .18s ease;
}
.page-about .taxo-tree a:hover {
  color: var(--about-a);
  padding-left: 8px;
}
.page-about .taxo-tree a span {
  flex: 0 0 auto;
  padding: 3px 10px;
  border-radius: 99px;
  background: rgba(0, 0, 0, .05);
  font: 600 13px var(--font-mono);
  color: var(--ink-muted);
}

/* ---------- 更新机制 ---------- */
.page-about .about-updates {
  position: relative;
  overflow: hidden;
  padding: 72px 0 60px;
  background: var(--about-b);
  color: var(--about-ink);
}
.page-about .about-update-layout {
  display: grid;
  gap: 22px;
}
.page-about .update-rule-card {
  padding: 22px;
  background: var(--card-bg);
  border-top: 5px solid var(--line-b);
  border-radius: 16px;
  box-shadow: var(--shadow);
}
.page-about .update-rule-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-bottom: 12px;
  border-radius: 50%;
  background: var(--about-b);
  color: var(--about-invert);
  font-size: 20px;
  line-height: 1;
}
.page-about .update-rule-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 20px;
  color: var(--ink);
}
.page-about .update-rule-card p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-muted);
}
.page-about .update-rule-card p strong {
  color: var(--ink);
}
.page-about .update-rule-card h4 {
  margin: 18px 0 6px;
  font-size: 13px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--line-b);
}
.page-about .update-rule-points {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .update-rule-points li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 0;
  border-bottom: 1px dashed #EFEFEF;
  font-size: 14px;
  color: var(--ink);
}
.page-about .update-rule-points li:last-child {
  border-bottom: none;
}
.page-about .urp-num {
  flex: 0 0 auto;
  padding: 2px 8px;
  border-radius: 99px;
  background: var(--status-rec);
  color: var(--ink-invert);
  font: 600 11px var(--font-mono);
  letter-spacing: .06em;
  white-space: nowrap;
}
.page-about .update-timeline {
  position: relative;
  display: grid;
  gap: 16px;
}
.page-about .update-timeline::before {
  content: "";
  position: absolute;
  left: 31px;
  top: 14px;
  bottom: 14px;
  border-left: 2px dashed rgba(255, 255, 255, .75);
}
.page-about .update-node {
  position: relative;
  display: flex;
  gap: 16px;
}
.page-about .update-node-img {
  position: relative;
  z-index: 1;
  flex: 0 0 64px;
  width: 64px;
  height: 64px;
  overflow: hidden;
  border-radius: 50%;
  background: var(--card-bg);
  box-shadow: 0 4px 14px rgba(0, 0, 0, .18);
}
.page-about .update-node-img img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-about .update-node-num {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font: 700 18px var(--font-mono);
  color: var(--about-invert);
  text-shadow: 0 2px 8px rgba(0, 0, 0, .55);
}
.page-about .update-node-img--css {
  display: flex;
  align-items: center;
  justify-content: center;
}
.page-about .update-node-img--css span {
  font: 700 18px var(--font-mono);
  color: var(--about-ink);
}
.page-about .update-node-body {
  flex: 1;
  padding: 14px 16px;
  background: rgba(255, 255, 255, .95);
  border-radius: 14px;
  border-left: 5px solid var(--status-new);
  box-shadow: var(--shadow);
}
.page-about .update-node--46 .update-node-body {
  border-left-color: var(--status-hot);
}
.page-about .update-node--47 .update-node-body {
  border-left-color: var(--status-rec);
}
.page-about .update-node-body .badge {
  margin-bottom: 8px;
}
.page-about .update-node-body h3 {
  margin: 0 0 4px;
  font-family: var(--font-heading);
  font-size: 20px;
  color: var(--ink);
}
.page-about .update-node-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--ink-muted);
}

/* ---------- 检索方式 ---------- */
.page-about .about-search {
  position: relative;
  overflow: hidden;
  padding: 72px 0 60px;
  background: var(--about-c);
  color: var(--about-ink);
}
.page-about .about-search-grid {
  display: grid;
  gap: 16px;
}
.page-about .search-step {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 230px;
  padding: 20px 18px;
  background: var(--card-bg);
  border-radius: 16px;
  box-shadow: var(--shadow);
  color: var(--ink);
  text-decoration: none;
  transition: transform var(--transition), box-shadow var(--transition);
}
.page-about .search-step:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, .22);
}
.page-about .search-step--a {
  border-top: 5px solid var(--line-a);
}
.page-about .search-step--b {
  border-top: 5px solid var(--line-b);
}
.page-about .search-step--c {
  border-top: 5px solid var(--line-c);
}
.page-about .search-step--pink {
  border-top: 5px solid var(--accent-pink);
}
.page-about .search-step-img {
  display: block;
  width: 100%;
  height: 128px;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: 14px;
}
.page-about .search-step-symbol {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  margin-bottom: 14px;
  border-radius: 12px;
  background: rgba(0, 0, 0, .04);
  font: 700 14px var(--font-mono);
  letter-spacing: .08em;
  color: var(--ink-muted);
}
.page-about .search-step--b .search-step-symbol {
  background: rgba(255, 122, 0, .14);
  color: #B05800;
}
.page-about .search-step--c .search-step-symbol {
  background: rgba(0, 201, 167, .14);
  color: #007A66;
}
.page-about .search-step--pink .search-step-symbol {
  background: rgba(255, 110, 199, .14);
  color: #C4006A;
}
.page-about .search-step-index {
  margin-bottom: 6px;
  font: 500 11px var(--font-mono);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-muted);
}
.page-about .search-step h3 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 21px;
  color: var(--ink);
}
.page-about .search-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-muted);
}

/* ---------- 栏目结构与版本入口 ---------- */
.page-about .about-structure {
  padding: 72px 0 64px;
  background: var(--bg-base);
  color: var(--ink-invert);
}
.page-about .structure-layout {
  display: grid;
  gap: 20px;
}
.page-about .structure-panel {
  padding: 24px;
  border-radius: 16px;
}
.page-about .structure-panel--routes {
  border: 1px solid rgba(255, 255, 255, .12);
  background: rgba(255, 255, 255, .06);
}
.page-about .structure-panel--versions {
  border: 1px solid rgba(255, 255, 255, .12);
  background: linear-gradient(135deg, rgba(213, 0, 109, .22), rgba(255, 122, 0, .16));
}
.page-about .structure-panel h3 {
  margin: 0 0 16px;
  font-family: var(--font-heading);
  font-size: 22px;
  letter-spacing: .02em;
  color: var(--ink-invert);
}
.page-about .structure-routes {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .structure-routes li {
  border-bottom: 1px solid rgba(255, 255, 255, .08);
}
.page-about .structure-routes li:last-child {
  border-bottom: none;
}
.page-about .structure-routes a {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 6px;
  color: rgba(255, 255, 255, .85);
  text-decoration: none;
  transition: color .18s ease, padding-left .18s ease;
}
.page-about .structure-routes a:hover {
  color: var(--about-pink);
  padding-left: 10px;
}
.page-about .structure-routes small {
  font-size: 12px;
  color: rgba(255, 255, 255, .5);
}
.page-about .structure-versions {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .structure-versions li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 11px 0;
  border-bottom: 1px solid rgba(255, 255, 255, .08);
  font-size: 14px;
  line-height: 1.6;
  color: rgba(255, 255, 255, .82);
}
.page-about .structure-versions li:last-child {
  border-bottom: none;
}
.page-about .sv-mark {
  flex: 0 0 auto;
  padding: 2px 10px;
  border-radius: 99px;
  font: 600 12px var(--font-mono);
}
.page-about .sv-mark--a {
  background: var(--about-a);
  color: var(--about-invert);
}
.page-about .sv-mark--b {
  background: var(--about-b);
  color: var(--about-invert);
}
.page-about .sv-mark--c {
  background: var(--about-c);
  color: var(--about-ink);
}
.page-about .sv-mark--pink {
  background: var(--about-pink);
  color: var(--about-ink);
}
.page-about .sv-mark--blue {
  background: var(--about-blue);
  color: var(--about-ink);
}

/* ---------- 响应式断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(5, 1fr);
    gap: 14px;
  }
  .page-about .stat-clip {
    min-height: 96px;
  }
  .page-about .about-search-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 720px) {
  .page-about .about-taxo-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .taxo-card:last-child {
    grid-column: span 2;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 48px 0 64px;
  }
  .page-about .about-hero-side {
    display: flex;
  }
  .page-about .about-hero-grid {
    grid-template-columns: 1fr 200px;
  }
  .page-about .about-update-layout {
    grid-template-columns: 300px 1fr;
    align-items: start;
  }
  .page-about .structure-layout {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1080px) {
  .page-about .about-taxo-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .taxo-card:last-child {
    grid-column: auto;
  }
  .page-about .about-search-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (max-width: 480px) {
  .page-about .about-structure-panel {
    padding: 18px;
  }
  .page-about .structure-routes a {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
}