:root {
  --radius: 12px;
  --space: 16px;
  --maxw: 960px;
  --brand: #0a74b9;
  --card-bg: rgba(255, 255, 255, 0.9);
  --text: #222;
  --muted: #666;
}

* { box-sizing: border-box; }

body {
  font-family: system-ui, -apple-system, Segoe UI, Arial, sans-serif;
  margin: 0;
  background: linear-gradient(135deg, #72c6ef 0%, #004e92 100%);
  color: var(--text);
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0);
  white-space: nowrap; border: 0;
}

.site-header {
  padding: 8px 12px;
}

@keyframes cardIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.page-content {
  max-width: var(--maxw);
  margin: 24px auto;
  padding: 20px;
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: 0 8px 28px rgba(0,0,0,0.14);
  animation: cardIn .3s ease-out both;
}

.page-header {
  font-size: clamp(20px, 2.4vw, 28px);
  text-align: center;
  color: #064d74;
  margin: 0 0 8px;
}

.page-image-wrapper {
  width: min(100%, 640px);
  aspect-ratio: 1 / 1;
  position: relative;
  margin: 12px auto;
}

.page-image {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  border-radius: calc(var(--radius) - 4px);
}
.page-image.fade-in {
  animation: fadeIn .28s ease-out;
}

.page-body {
  background-color: #fafafa;
  border-radius: var(--radius);
  padding: 16px;
  margin-top: 10px;
  text-align: left;
  color: var(--text);
  white-space: normal;
  line-height: 1.75;
  font-size: 16px;
}

.navigation {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 6px 0 18px;
}

.navigation-row {
  display: flex;
  justify-content: center;
  margin: 12px 0;
  gap: 10px;
}

.navigation button, .navigation a {
  background-color: #ffffff;
  color: rgb(33, 33, 33);
  border: 1px solid #e7e7e7;
  padding: 8px 16px;
  text-decoration: none;
  border-radius: 8px;
  cursor: pointer;
  transition: transform .06s ease, background-color .2s ease, box-shadow .2s ease, border-color .2s ease;
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.navigation button:hover, .navigation a:hover {
  background-color: #f3f6f9;
  border-color: #e0e0e0;
}

.navigation button:active {
  transform: scale(.98);
}

.navigation button:disabled {
  opacity: .45;
  cursor: not-allowed;
}

.navigation button:focus-visible {
  outline: 3px solid #3aa0ff;
  outline-offset: 2px;
}

#page-info {
  color: #fff;
  text-shadow: 0 1px 2px rgba(0,0,0,0.25);
}

footer {
  text-align: center;
  margin-top: 12px;
  padding: 10px;
}

footer a {
  color: white;
  text-decoration: none;
  cursor: pointer;
}

footer a:hover {
  text-decoration: underline;
}

@media (max-width: 600px) {
  .page-content {
    margin: 12px;
    padding: 14px;
  }
  .page-body {
    font-size: 15px;
  }
}

/* 优先考虑无动画用户 */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* 图片占位骨架 */
.page-picture.loading {
  background: linear-gradient(90deg,#eee 25%,#f5f5f5 37%,#eee 63%);
  background-size: 400% 100%;
  animation: skeleton 1.2s ease-in-out infinite;
  display: block;
  border-radius: calc(var(--radius) - 4px);
}
@keyframes skeleton {
  0% { background-position: 100% 0; }
  100% { background-position: 0 0; }
}

/* 目录样式 */
.toc {
  margin: 8px 0 12px;
  padding: 8px 12px;
  border-left: 3px solid var(--brand);
  background: rgba(255,255,255,0.6);
  border-radius: 8px;
  font-size: 14px;
}
.toc a {
  color: #064d74;
  text-decoration: none;
  margin-right: 12px;
}
.toc a:hover { text-decoration: underline; }

/* 代码块微样式（与 highlight 主题配合） */
.page-body pre {
  background: #0b1020;
  color: #eaeef3;
  padding: 12px;
  border-radius: 8px;
  overflow: auto;
}