:root {
  --blue: #5fb3ea;
  --blue-light: #83c8f3;
  --blue-pale: #dff2fe;
  --blue-deep: #3f8fd4;
  --blue-dark: #2d7bb8;
  --accent-rgb: 63, 143, 212;
  --accent-light-rgb: 223, 242, 254;
  --ink-rgb: 18, 50, 76;
  --bg: #f8fbfe;
  --bg-subtle: #edf6fc;
  --bg-card: rgba(255, 255, 255, 0.94);
  --bg-card-hover: rgba(255, 255, 255, 1);
  --reading-width: 820px;
  --reading-width-wide: 960px;
  --text-primary: #12324c;
  --text-secondary: #3f5f7b;
  --text-muted: #5a7287;
  --border: rgba(var(--accent-rgb), 0.12);
  --border-strong: rgba(var(--accent-rgb), 0.22);
  --border-soft: rgba(var(--accent-rgb), 0.08);
  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: "SF Mono", "Menlo", "Monaco", "Consolas", monospace;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--sans);
  color: var(--text-primary);
  background: #ffffff;
  -webkit-font-smoothing: antialiased;
  line-height: 1.7;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 12px;
  z-index: 1000;
  padding: 9px 14px;
  border-radius: 9px;
  background: var(--blue-deep);
  color: #fff;
  text-decoration: none;
  transform: translateY(-160%);
  transition: transform 0.18s ease;
}

.skip-link:focus-visible {
  transform: translateY(0);
}

:where(a, button):focus-visible {
  outline: 2px solid var(--blue-deep);
  outline-offset: 3px;
}

a {
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.tn,
.topnav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px max(32px, calc((100% - 1240px) / 2));
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.tn {
  height: 64px;
}

.topnav {
  height: 64px;
}

.tn a.tn-b,
.topnav-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.tn .tn-l,
.topnav-logo {
  width: 36px;
  height: 36px;
  object-fit: contain;
  border-radius: 6px;
}

.tn .tn-n,
.topnav-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
}

.tn .tn-r,
.topnav-links {
  display: flex;
  align-items: center;
  gap: 20px;
}

.tn .tn-r a,
.topnav-links a {
  color: rgba(var(--ink-rgb), 0.72);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  padding: 0;
  border: none;
  border-radius: 0;
}

.tn .tn-r a:hover,
.topnav-links a:hover {
  color: var(--blue-deep);
}

/* 维语菜单按完整词组保留单行，品牌名不参与空间压缩。 */
html:lang(ug) .tn .tn-b {
  flex-shrink: 0;
}

html:lang(ug) .tn .tn-n,
html:lang(ug) .tn .tn-r > a {
  white-space: nowrap;
}

@media (min-width: 1280px) {
  html:lang(ug) .tn {
    column-gap: 16px;
  }

  html:lang(ug) .tn .tn-r {
    gap: 12px;
    flex-shrink: 0;
  }
}

.lang-select-wrap {
  position: relative;
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
}

.lang-select-wrap::after {
  content: "";
  position: absolute;
  right: 12px;
  top: 50%;
  width: 6px;
  height: 6px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  color: var(--blue-deep);
  pointer-events: none;
  transform: translateY(-65%) rotate(45deg);
}

.lang-select {
  width: 108px;
  min-height: 36px;
  padding: 7px 30px 7px 14px;
  border: 1px solid rgba(var(--accent-rgb), 0.14);
  border-radius: 999px;
  outline: none;
  appearance: none;
  -webkit-appearance: none;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  box-shadow: 0 8px 24px rgba(var(--accent-rgb), 0.08);
  color: var(--blue-deep);
  cursor: pointer;
  direction: ltr;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.2;
  transition:
    background-color 300ms cubic-bezier(0.34, 1.56, 0.64, 1),
    border-color 300ms cubic-bezier(0.34, 1.56, 0.64, 1),
    box-shadow 300ms cubic-bezier(0.34, 1.56, 0.64, 1),
    transform 300ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.lang-select:hover,
.lang-select:focus-visible {
  background: rgba(255, 255, 255, 0.9);
  border-color: rgba(var(--accent-rgb), 0.18);
  box-shadow: 0 8px 24px rgba(var(--accent-rgb), 0.12);
  transform: translateY(-1px);
}

.lang-select:focus-visible {
  outline: none;
}

.tn .tn-r a.is-active,
.topnav-links a.is-active {
  color: var(--blue-deep);
  padding: 8px 18px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(var(--accent-rgb), 0.14);
  border-radius: 999px;
  box-shadow: 0 8px 24px rgba(var(--accent-rgb), 0.08);
  font-weight: 600;
}

.nav-star-badge { display:inline-flex; align-items:center; padding:1px 6px; margin-inline-start:6px; border-radius:999px; background:rgba(240,180,41,0.15); color:#d4930f; font-size:12px; font-weight:700; }

.tn .tn-r a.nav-cta,
.topnav-links a.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
  gap: 6px;
  padding: 8px 18px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(var(--accent-rgb), 0.14);
  border-radius: 999px;
  color: var(--blue-deep);
  font-weight: 600;
  box-shadow: 0 8px 24px rgba(var(--accent-rgb), 0.08);
}

.lang-menu {
  position: relative;
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  direction: ltr;
}

.lang-trigger {
  min-height: 40px;
  padding: 0 11px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  border: 0.5px solid rgba(255,255,255,0.48);
  border-radius: 10px;
  outline: none;
  background: rgba(255,255,255,0.58);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  box-shadow: 0 1px 3px rgba(var(--ink-rgb), 0.04), 0 8px 18px rgba(var(--accent-rgb), 0.06);
  color: rgba(var(--ink-rgb), 0.68);
  cursor: pointer;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
  transition:
    background-color 150ms ease,
    border-color 150ms ease,
    color 150ms ease,
    box-shadow 150ms ease,
    transform 150ms ease;
}

.lang-trigger:hover,
.lang-menu.open .lang-trigger {
  background: rgba(255,255,255,0.78);
  border-color: rgba(var(--accent-rgb), 0.14);
  color: var(--blue-deep);
  box-shadow: 0 2px 8px rgba(0,0,0,0.06), 0 8px 24px rgba(var(--accent-rgb), 0.08);
  transform: translateY(-1px);
}

.lang-trigger:focus-visible {
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.16), 0 2px 8px rgba(0,0,0,0.06);
}

.lang-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  opacity: 0.84;
}

.lang-chevron {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  opacity: 0.72;
  transition: transform 220ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.lang-menu.open .lang-chevron {
  transform: rotate(180deg);
}

.lang-current {
  white-space: nowrap;
  direction: auto;
}

.lang-menu-list {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 220;
  min-width: 136px;
  padding: 6px;
  border: 0.5px solid rgba(255,255,255,0.55);
  border-radius: 12px;
  background: rgba(255,255,255,0.82);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  box-shadow: 0 20px 40px rgba(var(--ink-rgb), 0.12), 0 8px 16px rgba(var(--ink-rgb), 0.06);
  opacity: 0;
  visibility: hidden;
  transform: scale(0.96) translateY(-4px);
  transform-origin: top right;
  transition:
    opacity 160ms ease,
    transform 220ms cubic-bezier(0.34, 1.56, 0.64, 1),
    visibility 160ms ease;
}

.lang-menu.open .lang-menu-list {
  opacity: 1;
  visibility: visible;
  transform: scale(1) translateY(0);
}

.tn .tn-r .lang-menu-list a,
.topnav-links .lang-menu-list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 10px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  box-shadow: none;
  color: rgba(var(--ink-rgb), 0.72);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  line-height: 1.2;
  direction: auto;
  transition: background-color 150ms ease, color 150ms ease;
}

.tn .tn-r .lang-menu-list a:hover,
.topnav-links .lang-menu-list a:hover {
  background: rgba(var(--accent-rgb), 0.1);
  color: var(--blue-deep);
}

.tn .tn-r .lang-menu-list a.is-active,
.topnav-links .lang-menu-list a.is-active {
  padding: 9px 10px;
  border: 0;
  border-radius: 8px;
  background: rgba(var(--accent-rgb), 0.1);
  box-shadow: none;
  color: var(--blue-deep);
  font-weight: 600;
}

.tn .tn-r .lang-menu-list a.is-active::after,
.topnav-links .lang-menu-list a.is-active::after {
  content: '✓';
  font-size: 12px;
  color: var(--blue-deep);
}

.lang-menu:not(.open) .lang-menu-list a.is-active::after {
  content: none;
}

.lang-menu.open .lang-menu-list a.is-active::after {
  content: '✓';
}

.tn.scrolled,
.topnav.scrolled {
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(63,143,212,0.12);
  box-shadow: 0 10px 30px rgba(95,179,234,0.08);
}

.tn-burger,
.topnav-burger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.tn-burger span,
.topnav-burger span {
  display: block;
  width: 22px;
  height: 2px;
  margin: 5px 0;
  border-radius: 2px;
  background: var(--text-primary);
  transition: background-color 0.3s ease, opacity 0.3s ease, transform 0.3s ease;
}

/* 侧栏滚动条沿侧栏边缘平滑滚动，置顶显示并贴合内容高度。 */
.sb {
  --sidebar-scrollbar-thumb: transparent;
  position: fixed;
  top: 64px;
  left: 0;
  bottom: 0;
  width: 240px;
  padding: 24px 14px 32px 14px;
  overflow-y: auto;
  overscroll-behavior-y: contain;
  scroll-padding-block: 24px;
  background: rgba(248, 251, 254, 0.75);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-right: 1px solid rgba(18, 50, 76, 0.06);
  transition: background-color 0.25s ease, border-color 0.25s ease, transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.2s ease;
}

[data-theme="dark"] .sb {
  background: rgba(15, 23, 36, 0.75);
  border-right-color: rgba(255, 255, 255, 0.08);
}

.sb:hover, .sb:focus-within { --sidebar-scrollbar-thumb: rgba(18, 50, 76, 0.16); }
[data-theme="dark"] .sb:hover, [data-theme="dark"] .sb:focus-within { --sidebar-scrollbar-thumb: rgba(255, 255, 255, 0.2); }
.sb::-webkit-scrollbar { width: 4px; }
.sb::-webkit-scrollbar-track { background: transparent; margin-block: 8px; }
.sb::-webkit-scrollbar-thumb {
  border-radius: 999px;
  background-color: var(--sidebar-scrollbar-thumb);
  transition: background-color 0.2s ease;
}
.sb::-webkit-scrollbar-thumb:hover { background-color: rgba(18, 50, 76, 0.3); }
[data-theme="dark"] .sb::-webkit-scrollbar-thumb:hover { background-color: rgba(255, 255, 255, 0.35); }
.sb::-webkit-scrollbar-button { display: none; }
@supports not selector(::-webkit-scrollbar) {
  .sb { scrollbar-width: thin; scrollbar-color: transparent transparent; }
  .sb:hover, .sb:focus-within { scrollbar-color: rgba(18, 50, 76, 0.16) transparent; }
  [data-theme="dark"] .sb:hover, [data-theme="dark"] .sb:focus-within { scrollbar-color: rgba(255, 255, 255, 0.2) transparent; }
}

.sb .sb-t {
  padding: 0 12px;
  margin-bottom: 14px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.8px;
  text-transform: uppercase;
  color: var(--blue-deep);
  opacity: 0.72;
}

.sb a {
  display: flex;
  align-items: center;
  margin-bottom: 3px;
  padding: 8px 12px;
  border-radius: 9px;
  border: 1px solid transparent;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  line-height: 1.45;
  transition: color 0.16s ease, background-color 0.16s ease, border-color 0.16s ease;
}

.sb a:hover {
  color: var(--text-primary);
  background: rgba(63, 143, 212, 0.06);
  border-color: rgba(63, 143, 212, 0.08);
}

.sb a.on {
  color: var(--blue-deep);
  background: rgba(63, 143, 212, 0.1);
  border-color: rgba(63, 143, 212, 0.16);
  font-weight: 600;
}

[data-theme="dark"] .sb a.on {
  color: var(--blue-light);
  background: rgba(95, 179, 234, 0.12);
  border-color: rgba(95, 179, 234, 0.22);
}

.m {
  margin-left: 240px;
  padding: 112px 80px 104px 64px;
  max-width: 1120px;
}

.docs-page .m {
  background: transparent;
  box-shadow: none;
  transition: margin 0.25s cubic-bezier(0.16, 1, 0.3, 1), max-width 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.docs-page .m > :where(h1, h2, h3, p, ul, ol, hr, .tip) {
  max-width: var(--reading-width);
}

.docs-page .m > :where(pre, table, .page-lead) {
  max-width: var(--reading-width-wide);
}

.page-lead {
  position: relative;
  margin-bottom: 56px;
  padding: 28px 30px;
  border: 1px solid rgba(var(--accent-rgb), 0.16);
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 18px 40px rgba(var(--accent-rgb), 0.08);
  overflow: hidden;
}

.page-kicker {
  margin-bottom: 10px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--blue-deep);
  opacity: 0.76;
}

.m h1 {
  margin-bottom: 12px;
  font-size: 40px;
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: -0.8px;
  color: var(--text-primary);
}

.m .sub {
  margin-bottom: 48px;
  max-width: 720px;
  font-size: 19px;
  line-height: 1.8;
  color: var(--text-secondary);
}

.m h2 {
  margin-top: 64px;
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  font-size: 30px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--text-primary);
}

.m h3 {
  margin-top: 32px;
  margin-bottom: 12px;
  font-size: 22px;
  line-height: 1.45;
  font-weight: 600;
  color: var(--text-primary);
}

.m p,
.m li {
  font-size: 17px;
  line-height: 1.9;
  color: var(--text-secondary);
}

.m p {
  margin-bottom: 16px;
}

.m ul,
.m ol {
  margin-bottom: 16px;
  padding-left: 22px;
}

.m li {
  margin-bottom: 6px;
}

.docs-page .m > h2:first-of-type {
  margin-top: 24px;
}

.docs-page .m pre,
.docs-page .m table,
.docs-page .m .tip {
  margin-top: 22px;
  margin-bottom: 30px;
}

.m strong {
  color: var(--text-primary);
  font-weight: 600;
}

.m a {
  color: var(--blue-deep);
  text-decoration: none;
  font-weight: 500;
}

.m a:hover {
  text-decoration: underline;
}

.m code,
kbd {
  font-family: var(--mono);
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.m code {
  padding: 2px 7px;
  font-size: 15px;
  color: var(--blue-deep);
}

/* 技术标识保持代码阅读顺序，正文沿页面语言排版。 */
.m pre, .m code, kbd { direction:ltr; unicode-bidi:isolate; }
.m pre { text-align:left; }
.doc-image-link { display:block; }
.doc-image-hint { color:var(--blue-deep); }
.k12-page .page-lead h1 { text-wrap:balance; }

.m pre {
  margin: 18px 0;
  padding: 20px;
  overflow-x: auto;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 16px 34px rgba(var(--accent-rgb), 0.06);
}

.m pre code {
  padding: 0;
  border: none;
  box-shadow: none;
  background: none;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-primary);
}

.tip {
  margin: 20px 0;
  padding: 16px 18px;
  border: 1px solid rgba(var(--accent-rgb), 0.14);
  border-left: 2px solid rgba(var(--accent-rgb), 0.42);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 14px 30px rgba(var(--accent-rgb), 0.05);
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.8;
}

.tip b {
  color: var(--blue-deep);
}

.doc-shot {
  max-width: var(--reading-width-wide);
  margin: 28px 0 34px;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 22px 54px rgba(var(--accent-rgb), 0.1), 0 2px 10px rgba(23, 38, 53, 0.04);
  content-visibility: auto;
  contain-intrinsic-size: auto 615px;
}

.doc-shot img {
  width: 100%;
  height: auto;
  aspect-ratio: auto;
  object-fit: contain;
  display: block;
  border: 1px solid rgba(var(--accent-rgb), 0.12);
  border-radius: 16px;
  background: var(--bg-subtle);
  box-shadow: 0 12px 30px rgba(var(--accent-rgb), 0.06);
}

/* 深色主题下图注和窄屏使用路线继承浅字，截图容器同步使用主题卡片底色。 */
[data-theme="dark"] .doc-shot {
  background: var(--bg-card);
}

.doc-shot figcaption {
  margin-top: 12px;
  padding: 0 6px 2px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-muted);
}

.doc-gallery {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  max-width: 1240px;
  margin: 0 auto 84px;
  padding: 0 32px;
}

.doc-gallery--single {
  grid-template-columns: minmax(0, 1fr);
}

/* 正文中的完整客户端截图独占一行，避免把操作细节缩成缩略图。 */
.docs-page .m > .doc-gallery {
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-inline: 0;
  padding-inline: 0;
}

.doc-gallery-head {
  grid-column: 1 / -1;
  margin: 10px 0 2px;
}

.doc-gallery-head h2 {
  margin: 0 0 10px;
  padding: 0;
  border: none;
  font-size: 32px;
  color: var(--text-primary);
}

.doc-gallery-head p {
  margin: 0;
  max-width: 760px;
  font-size: 17px;
  line-height: 1.85;
  color: var(--text-secondary);
}

.doc-gallery .doc-shot {
  max-width: none;
  margin: 0;
}

.doc-gallery--single .doc-shot {
  grid-column: 1 / -1;
}

table {
  width: 100%;
  margin: 18px 0;
  border-collapse: collapse;
  overflow: hidden;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 16px 34px rgba(var(--accent-rgb), 0.06);
  font-size: 14px;
}

th {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  background: rgba(var(--accent-light-rgb), 0.22);
  color: var(--text-primary);
  font-weight: 600;
}

td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-soft);
  color: var(--text-secondary);
}

tr:hover td {
  background: var(--bg-subtle);
}

kbd {
  display: inline-block;
  padding: 2px 8px;
  font-size: 13px;
  color: var(--text-primary);
}

hr {
  height: 1px;
  margin: 40px 0;
  border: none;
  background: var(--border);
}

.hero {
  padding: 124px 32px 42px;
  text-align: center;
}

.hero h1 {
  margin-bottom: 14px;
  font-size: 44px;
  font-weight: 800;
  letter-spacing: -0.7px;
  color: var(--text-primary);
}

.hero p {
  max-width: 620px;
  margin: 0 auto;
  font-size: 20px;
  line-height: 1.75;
  color: var(--text-secondary);
}

.docs-hub .hero {
  max-width: 1240px;
  margin: 0 auto;
  padding: 112px 0 32px;
  text-align: start;
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  margin-bottom: 16px;
  border-radius: 999px;
  border: 1px solid rgba(var(--accent-rgb), 0.14);
  background: rgba(var(--accent-light-rgb), 0.18);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.8px;
  text-transform: uppercase;
  color: var(--blue-deep);
}

.hero-meta {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid rgba(var(--accent-rgb), 0.12);
  background: rgba(var(--accent-light-rgb), 0.14);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 600;
}

.cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 36px 84px;
}

.card {
  display: block;
  padding: 32px;
  border-radius: 26px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  text-decoration: none;
}

.card:hover {
  transform: none;
  border-color: rgba(var(--accent-rgb), 0.18);
  background: var(--bg-card-hover);
}

/* card-icon styles moved to below media query with SVG sizing */

.card-title {
  margin-bottom: 8px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
}

.card-desc {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-secondary);
}

.footer {
  margin-top: 48px;
  padding: 22px 32px 18px;
  border-top: 1px solid var(--border);
  background: var(--bg-subtle);
}

.footer a {
  text-decoration: none;
}

.footer-main {
  max-width: 1240px;
  margin: 0 auto;
  padding-bottom: 16px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 36px;
}

.footer-brand {
  max-width: 320px;
}

.footer-logo {
  display: inline-block;
  margin-bottom: 8px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
}

.footer-logo:hover {
  color: var(--blue-deep);
}

.footer-tagline {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--text-secondary);
}

.footer-columns,
.footer-grid {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(4, minmax(130px, 1fr));
  gap: 24px;
}

.footer-col-title {
  margin-bottom: 10px;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.footer-col a,
.footer-col span {
  display: block;
  padding: 2.5px 0;
  font-size: 13.5px;
  color: var(--text-secondary);
  transition: color 0.2s;
}

.footer-col a:hover,
.footer-meta-links a:hover {
  color: var(--blue-deep);
}

.footer-wechat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
  padding-top: 2px;
}

.footer-wechat img {
  width: 96px;
  height: 96px;
  border-radius: 8px;
}

.footer-wechat-label {
  font-size: 12px;
  color: var(--text-muted);
}

.footer-bottom {
  max-width: 1240px;
  margin: 0 auto;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  line-height: normal;
}

.footer-copy {
  font-size: 13px;
  color: var(--text-muted);
  line-height: normal;
}

.footer-meta-links {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-meta-links a {
  font-size: 13px;
  color: var(--text-muted);
  transition: color 0.2s;
}

/* ---- Doc Article Footer (Route A: Focused, Zero-Collision) ---- */
.doc-footer {
  margin: 36px auto 28px;
  max-width: var(--reading-width, 760px);
  padding-top: 18px;
  border-top: 1px solid var(--border);
  text-align: center;
  background: transparent;
}

.doc-footer-meta {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.doc-footer-meta a {
  font-size: 13px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.18s ease;
}

.doc-footer-meta a:hover {
  color: var(--blue-deep);
}

.doc-footer-sep {
  font-size: 13px;
  color: var(--text-muted);
  opacity: 0.35;
  user-select: none;
}

.doc-footer .footer-bottom {
  border-top: none;
  padding-top: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 0 auto;
}

.doc-footer .footer-copy {
  font-size: 12.5px;
  color: var(--text-muted);
  opacity: 0.72;
}

.docs-page:not(.content-page) .sb ~ .doc-footer {
  margin-left: calc(var(--doc-grid-edge, 32px) + 240px);
  padding-left: 48px;
  padding-right: 48px;
  max-width: 760px;
  transition: margin 0.25s cubic-bezier(0.16, 1, 0.3, 1), max-width 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---- Collapsible Left Sidebar (Zen / Focus Reading Mode) ---- */
.sb-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  padding: 0 4px;
}

.sb-header .sb-t {
  margin-bottom: 0;
  padding: 0;
}

.sb-collapse-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}

.sb-collapse-btn:hover {
  color: var(--text-primary);
  background: rgba(var(--accent-rgb), 0.1);
  border-color: rgba(var(--accent-rgb), 0.18);
}

/* Edge-Docked Pull Handle (Option 1: 极窄贴边抽屉拉手) */
.sb-expand-btn {
  display: none;
  position: fixed;
  left: 0;
  top: 110px;
  z-index: 45;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 44px;
  padding: 0;
  border-radius: 0 8px 8px 0;
  border: 1px solid var(--border);
  border-left: none;
  background: rgba(248, 251, 254, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 2px 2px 8px rgba(var(--accent-rgb), 0.08);
  color: var(--text-muted);
  cursor: pointer;
  opacity: 0;
  transform: translateX(-100%);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.22s cubic-bezier(0.16, 1, 0.3, 1), width 0.18s ease, color 0.18s ease, background-color 0.18s ease, box-shadow 0.18s ease;
}

[data-theme="dark"] .sb-expand-btn {
  background: rgba(21, 30, 45, 0.88);
  border-color: rgba(255, 255, 255, 0.1);
  border-left: none;
  color: rgba(255, 255, 255, 0.55);
}

.sb-expand-btn:hover {
  width: 30px;
  color: var(--blue-deep);
  background: var(--bg-card-hover);
  box-shadow: 3px 3px 12px rgba(var(--accent-rgb), 0.14);
}

[data-theme="dark"] .sb-expand-btn:hover {
  background: rgba(30, 45, 65, 0.95);
  color: #7cc4f0;
}

@media (min-width: 769px) {
  body.sb-collapsed .sb {
    transform: translateX(-100%);
    opacity: 0;
    pointer-events: none;
  }

  body.sb-collapsed .sb-expand-btn {
    display: flex;
    opacity: 1;
    transform: translateX(0);
    pointer-events: auto;
  }

  /* Wide screens: slide content left to start at var(--doc-grid-edge, 48px) */
  body.sb-collapsed.docs-page:not(.content-page) .m {
    margin-left: var(--doc-grid-edge, 48px);
    max-width: 920px;
  }

  body.sb-collapsed.docs-page:not(.content-page) .sb ~ .doc-footer {
    margin-left: var(--doc-grid-edge, 48px);
    max-width: 920px;
  }

  @media (min-width: 1480px) {
    body.sb-collapsed.docs-page:not(.content-page) .m {
      margin-left: var(--doc-grid-edge, 48px);
      max-width: 920px;
    }
  }

  @media (max-width: 1279px) {
    body.sb-collapsed.docs-page:not(.content-page) .m {
      margin-left: 36px;
      margin-right: auto;
      max-width: 860px;
    }

    body.sb-collapsed.docs-page:not(.content-page) .sb ~ .doc-footer {
      margin-left: 36px;
      margin-right: auto;
      max-width: 860px;
    }
  }

  /* RTL Support */
  [dir="rtl"] body.sb-collapsed.docs-page:not(.content-page) .m {
    margin-left: 0;
    margin-right: var(--doc-grid-edge, 48px);
  }

  [dir="rtl"] body.sb-collapsed.docs-page:not(.content-page) .sb ~ .doc-footer {
    margin-left: 0;
    margin-right: var(--doc-grid-edge, 48px);
  }

  [dir="rtl"] .sb-expand-btn {
    left: auto;
    right: 0;
    border-radius: 8px 0 0 8px;
    border-left: 1px solid var(--border);
    border-right: none;
    transform: translateX(100%);
  }

  [dir="rtl"] .sb-expand-btn svg {
    transform: rotate(180deg);
  }

  [dir="rtl"] body.sb-collapsed .sb-expand-btn {
    transform: translateX(0);
  }
}

@media (min-width: 1480px) {
  .docs-page:not(.content-page) .sb ~ .doc-footer {
    padding-left: 40px;
    padding-right: 0;
  }
}

@media (min-width: 769px) and (max-width: 1100px) {
  .docs-page:not(.content-page) .sb ~ .doc-footer {
    margin-left: 240px;
    padding-inline: 32px;
  }
}

@media (max-width: 768px) {
  .docs-page:not(.content-page) .sb ~ .doc-footer {
    margin-left: 0;
    padding-inline: 20px;
  }
}

.mobile-doc-nav { display:none !important; }
@media (max-width: 768px) { .mobile-doc-nav { display:flex !important; } }

@media (max-width: 1100px) {
  .tn-burger,
  .topnav-burger {
    display: block;
  }

  .tn,
  .topnav {
    padding: 0 16px;
  }

  .tn .tn-n,
  .topnav-name {
    font-size: 16px;
  }

  .tn .tn-r,
  .topnav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 20px;
    border-bottom: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
  }

  .tn .tn-r.open,
  .topnav-links.open {
    display: flex;
  }

  .tn .tn-r a,
  .topnav-links a {
    padding: 12px 0;
    border: none;
    border-bottom: 1px solid var(--border-soft);
    border-radius: 0;
    font-size: 15px;
    color: rgba(var(--ink-rgb), 0.72);
  }

  .tn .tn-r a.is-active,
  .topnav-links a.is-active {
    box-shadow: none;
    background: transparent;
    padding: 12px 0;
    border: 0;
    border-bottom: 1px solid var(--border-soft);
    border-radius: 0;
    color: var(--blue-deep);
  }

  .tn .tn-r a.nav-cta,
  .topnav-links a.nav-cta {
    margin-top: 8px;
    padding: 12px 0;
    border: none;
    border-radius: 0;
    box-shadow: none;
    background: transparent;
    color: var(--blue-deep);
    text-align: left;
  }

  .lang-select-wrap {
    width: 100%;
    margin: 8px 0;
  }

  .lang-select {
    width: 100%;
    min-height: 42px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  }

  .lang-menu {
    width: 100%;
    margin: 8px 0;
    display: flex;
    flex-direction: column;
    align-items: stretch;
  }

  .lang-trigger {
    width: 100%;
    min-height: 42px;
    justify-content: center;
    box-shadow: none;
  }

  .lang-menu-list {
    position: static;
    display: none;
    width: 100%;
    margin-top: 8px;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .lang-menu.open .lang-menu-list {
    display: block;
    transform: none;
  }

  .tn .tn-r .lang-menu-list a,
  .topnav-links .lang-menu-list a,
  .tn .tn-r .lang-menu-list a.is-active,
  .topnav-links .lang-menu-list a.is-active {
    justify-content: center;
    padding: 10px 12px;
    border-bottom: 0;
  }

  .tn .tn-r a:last-child,
  .topnav-links a:last-child {
    border-bottom: none;
  }
}

@media (max-width: 900px) {
  .footer-main,
  .footer-bottom {
    max-width: 700px;
  }
}

/* 维语内页多一个首页入口及当前页标记，中等宽度提前使用同一折叠菜单。 */
@media (min-width: 1101px) and (max-width: 1279px) {
  html:lang(ug) .tn {
    padding-inline: 16px;
  }

  html:lang(ug) .tn .tn-n {
    font-size: 16px;
  }

  html:lang(ug) .tn-burger {
    display: block;
    min-width: 44px;
    min-height: 44px;
  }

  html:lang(ug) .tn-burger span {
    margin-inline: auto;
  }

  html:lang(ug) .tn .tn-r {
    display: none;
    position: absolute;
    top: 100%;
    inset-inline: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 20px;
    border-bottom: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(24px);
    max-height: calc(100vh - 80px);
    max-height: calc(100dvh - 80px);
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  html:lang(ug) .tn .tn-r.open {
    display: flex;
  }

  html:lang(ug) .tn .tn-r > a {
    padding: 12px 0;
    border: 0;
    border-bottom: 1px solid var(--border-soft);
    border-radius: 0;
    background: transparent;
    box-shadow: none;
  }

  html:lang(ug) .tn .tn-r a.nav-cta {
    margin-top: 8px;
    border-bottom: 0;
  }

  html:lang(ug) .tn .lang-menu {
    width: 100%;
    margin: 8px 0;
    display: flex;
    flex-direction: column;
    align-items: stretch;
  }

  html:lang(ug) .tn .lang-trigger {
    width: 100%;
    min-height: 42px;
    justify-content: center;
    box-shadow: none;
  }

  html:lang(ug) .tn .lang-menu-list {
    position: static;
    display: none;
    width: 100%;
    margin-top: 8px;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  html:lang(ug) .tn .lang-menu.open .lang-menu-list {
    display: block;
  }

  html:lang(ug) .tn .tn-r .lang-menu-list a {
    justify-content: center;
    padding: 10px 12px;
    border-bottom: 0;
  }

  [data-theme="dark"]:lang(ug) .tn .tn-r {
    background: rgba(15, 23, 36, 0.96);
    border-bottom-color: rgba(255, 255, 255, 0.06);
  }
}

@media (max-width: 768px) {
  .sb {
    display: none;
  }

  .m pre[data-lang]::before { display:none; }
  .m pre::after { display:none; }

  .mobile-doc-nav {
    display:flex;
    flex-wrap:nowrap;
    gap:6px;
    padding:12px 16px;
    margin-top:64px;
    margin-bottom:0;
    border-bottom:1px solid var(--border);
    overflow-x:auto;
    -webkit-overflow-scrolling:touch;
  }
  .mobile-doc-nav a {
    flex:0 0 auto;
    padding:6px 12px;
    border-radius:999px;
    font-size:13px;
    font-weight:500;
    color:var(--text-secondary);
    text-decoration:none;
    white-space:nowrap;
    border:1px solid var(--border);
    background:var(--bg-card);
  }
  .mobile-doc-nav a.on {
    background:rgba(var(--accent-rgb),0.1);
    color:var(--blue-deep);
    border-color:rgba(var(--accent-rgb),0.2);
  }

  .m {
    margin-left: 0;
    padding: 32px 22px 60px;
  }

  .page-lead {
    margin-bottom: 42px;
    padding: 22px 20px;
    border-radius: 22px;
  }

  .page-kicker {
    font-size: 11px;
    letter-spacing: 1.6px;
  }

  .m h1 {
    font-size: 28px;
  }

  .m h2 {
    font-size: 25px;
  }

  .m h3 {
    font-size: 18px;
  }

  .m p,
  .m li {
    font-size: 16px;
  }

  .m pre {
    padding: 14px;
    margin: 14px 0;
  }

  .m pre code {
    font-size: 13px;
  }

  table {
    display: block;
    overflow-x: auto;
    font-size: 13px;
  }

  th {
    padding: 8px 10px;
    white-space: nowrap;
  }
  td {
    padding: 8px 10px;
    white-space: normal;
    min-width: 100px;
  }

  .hero {
    padding: 100px 20px 36px;
  }

  .hero h1 {
    font-size: 28px;
  }

  .hero p {
    font-size: 16px;
  }

  .hero-meta {
    gap: 8px;
    margin-top: 16px;
  }

  .hero-pill {
    font-size: 13px;
  }

  .cards {
    grid-template-columns: 1fr;
    padding: 0 16px 60px;
  }

  .doc-gallery {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
    padding: 0 16px 60px;
  }

  .doc-gallery-head h2 {
    font-size: 26px;
  }

  .doc-gallery-head p,
  .doc-shot figcaption {
    font-size: 15px;
  }

  .doc-shot {
    margin: 22px 0 28px;
    padding: 6px;
    border-radius: 22px;
  }

  .doc-shot img {
    border-radius: 14px;
  }

  .footer {
    padding: 28px 20px 22px;
  }

  .footer-main {
    flex-direction: column;
    gap: 28px;
  }

  .footer-brand {
    max-width: none;
  }

  .footer-columns,
  .footer-grid {
    width: 100%;
    grid-template-columns: repeat(2, minmax(140px, 1fr));
    gap: 24px;
  }

  .footer-wechat {
    flex-direction: row;
    gap: 12px;
  }

  .footer-wechat img {
    width: 80px;
    height: 80px;
  }

  .footer-bottom {
    align-items: flex-start;
  }
}


@media (max-width: 640px) {
  .footer-columns,
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .footer-wechat {
    flex-direction: column;
  }
}

/* ===== Theme Toggle ===== */
.theme-toggle { background:none; border:1px solid var(--border); border-radius:8px; padding:8px 10px; min-width:40px; min-height:40px; justify-content:center; cursor:pointer; color:var(--text-secondary); display:flex; align-items:center; transition:border-color .2s, color .2s, background-color .2s; }
.theme-toggle:hover { border-color:var(--border-strong); color:var(--blue-deep); }
[data-theme="dark"] .ti-sun { display:inline; }
[data-theme="dark"] .ti-moon { display:none; }
.ti-sun { display:none; }
.ti-moon { display:inline; }

/* ===== Code block enhancements ===== */
.m pre { position:relative; }
.m pre[data-lang]::before {
  content: attr(data-lang);
  position: absolute;
  top: 8px;
  left: 20px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  opacity: 0.6;
}
[dir="rtl"] .m pre[data-lang]::before { left:auto; right:20px; }

/* Real copy button is injected by docs-nav.js as .code-copy (see enhancement layer below). */

.m pre code { counter-reset: line; }

/* ===== Card icon (SVG style matching main site feat-icon) ===== */
.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  margin-bottom: 16px;
  border-radius: 14px;
  background: rgba(var(--accent-light-rgb), 0.22);
  border: 1px solid rgba(var(--accent-rgb), 0.14);
  font-size: 24px;
}

/* ===== Dark Mode ===== */
[data-theme="dark"] {
  --bg: #0f1724;
  --bg-subtle: #151e2d;
  --bg-card: rgba(255,255,255,0.05);
  --bg-card-hover: rgba(255,255,255,0.08);
  --text-primary: #e2e8f0;
  --text-secondary: #a9b4c2;
  --text-muted: #8f9baa;
  --border: rgba(255,255,255,0.08);
  --border-strong: rgba(255,255,255,0.14);
  --border-soft: rgba(255,255,255,0.04);
  --blue: #5fb3ea;
  --blue-deep: #7cc4f0;
  --blue-light: #9dd4f5;
  --blue-pale: rgba(95,179,234,0.12);
  --accent-rgb: 95, 179, 234;
  --accent-light-rgb: 30, 45, 65;
  --ink-rgb: 226, 232, 240;
  color-scheme: dark;
}

[data-theme="dark"] body {
  background:
    radial-gradient(circle at top, rgba(30,45,65,0.5) 0%, rgba(15,23,36,0) 34%),
    linear-gradient(180deg, #0f1724 0%, #111b2a 22%, #151e2d 100%);
}

[data-theme="dark"] .tn.scrolled,
[data-theme="dark"] .topnav.scrolled {
  background: rgba(15,23,36,0.82);
  border-bottom-color: rgba(255,255,255,0.06);
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

[data-theme="dark"] .m pre {
  background: rgba(15, 23, 36, 0.8);
  border-color: rgba(255,255,255,0.06);
}

[data-theme="dark"] .m code {
  background: rgba(255,255,255,0.06);
  color: var(--blue-light);
}

[data-theme="dark"] .m pre code {
  background: none;
  color: var(--text-primary);
}

[data-theme="dark"] .tip {
  background: rgba(255,255,255,0.04);
  border-color: rgba(95,179,234,0.12);
  border-left-color: rgba(95,179,234,0.36);
}

[data-theme="dark"] .warn {
  background: rgba(255,180,50,0.06);
  border-color: rgba(255,180,50,0.14);
  border-left-color: rgba(255,180,50,0.4);
}

[data-theme="dark"] .sb {
  background: rgba(15,23,36,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-right-color: rgba(255,255,255,0.06);
}

[data-theme="dark"] .card {
  background: var(--bg-card);
  border-color: var(--border);
}

[data-theme="dark"] .card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-strong);
}

[data-theme="dark"] table {
  background: rgba(255,255,255,0.03);
  border-color: var(--border);
}

[data-theme="dark"] th {
  background: rgba(255,255,255,0.05);
  border-bottom-color: var(--border);
}

[data-theme="dark"] td {
  border-bottom-color: var(--border-soft);
}

[data-theme="dark"] tr:hover td {
  background: rgba(255,255,255,0.03);
}

[data-theme="dark"] .hero {
  background: transparent;
}

[data-theme="dark"] .footer {
  background: rgba(15,23,36,0.92);
  border-top-color: rgba(255,255,255,0.06);
}

[data-theme="dark"] .footer-logo,
[data-theme="dark"] .footer-col-title {
  color: var(--text-primary);
}

[data-theme="dark"] .footer-tagline,
[data-theme="dark"] .footer-col a,
[data-theme="dark"] .footer-meta-links a {
  color: var(--text-secondary);
}

[data-theme="dark"] .page-lead {
  background: rgba(255,255,255,0.04);
  border-color: rgba(255,255,255,0.08);
  box-shadow: 0 18px 40px rgba(0,0,0,0.15);
}

[data-theme="dark"] .m code,
[data-theme="dark"] kbd {
  border-color: rgba(255,255,255,0.08);
}

[data-theme="dark"] .m :not(pre) > code,
[data-theme="dark"] kbd {
  background: var(--bg-subtle);
}

[data-theme="dark"] .tn .tn-r a.is-active,
[data-theme="dark"] .topnav-links a.is-active {
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.1);
}

[data-theme="dark"] .tn .tn-r a.nav-cta,
[data-theme="dark"] .topnav-links a.nav-cta {
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.1);
}

/* 折叠菜单沿用选中文字标记，不继承桌面的选中胶囊底色。 */
@media (max-width: 1100px) {
  [data-theme="dark"] .tn .tn-r a.is-active,
  [data-theme="dark"] .topnav-links a.is-active {
    background: transparent;
    border-color: var(--border-soft);
  }
}

@media (min-width: 1101px) and (max-width: 1279px) {
  [data-theme="dark"]:lang(ug) .tn .tn-r a.is-active {
    background: transparent;
    border-color: var(--border-soft);
  }
}

[data-theme="dark"] .lang-select {
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.1);
  color: var(--blue-deep);
  box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}

[data-theme="dark"] .lang-select:hover,
[data-theme="dark"] .lang-select:focus-visible {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.16);
}

[data-theme="dark"] .lang-select option {
  background: #1c1c1e;
  color: var(--text-primary);
}

[data-theme="dark"] .lang-select-wrap::after {
  color: var(--blue-deep);
}

[data-theme="dark"] .lang-trigger {
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.1);
  color: rgba(232,236,240,0.72);
  box-shadow: 0 8px 24px rgba(0,0,0,0.18);
}

[data-theme="dark"] .lang-trigger:hover,
[data-theme="dark"] .lang-menu.open .lang-trigger {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.16);
  color: var(--blue-light);
}

[data-theme="dark"] .lang-menu-list {
  background: rgba(28,28,30,0.9);
  border-color: rgba(255,255,255,0.1);
  box-shadow: 0 20px 40px rgba(0,0,0,0.28), 0 8px 16px rgba(0,0,0,0.18);
}

[data-theme="dark"] .tn .tn-r .lang-menu-list a,
[data-theme="dark"] .topnav-links .lang-menu-list a {
  color: rgba(232,236,240,0.72);
}

[data-theme="dark"] .tn .tn-r .lang-menu-list a:hover,
[data-theme="dark"] .topnav-links .lang-menu-list a:hover,
[data-theme="dark"] .tn .tn-r .lang-menu-list a.is-active,
[data-theme="dark"] .topnav-links .lang-menu-list a.is-active {
  background: rgba(95,179,234,0.1);
  color: var(--blue-light);
}

[data-theme="dark"] .tn .tn-r .lang-menu-list a.is-active::after,
[data-theme="dark"] .topnav-links .lang-menu-list a.is-active::after {
  color: var(--blue-light);
}

[data-theme="dark"] .mobile-doc-nav a {
  background:rgba(255,255,255,0.04);
  border-color:rgba(255,255,255,0.08);
}
[data-theme="dark"] .mobile-doc-nav a.on {
  background:rgba(95,179,234,0.1);
  color:var(--blue-light);
}

[data-theme="dark"] .sb a:hover {
  background: rgba(255,255,255,0.05);
  border-color: rgba(255,255,255,0.08);
}

[data-theme="dark"] .sb a.on {
  background: rgba(95,179,234,0.1);
  border-color: rgba(95,179,234,0.2);
}

@media (max-width: 768px) {
  [data-theme="dark"] .tn .tn-r,
  [data-theme="dark"] .topnav-links {
    background: rgba(15,23,36,0.96);
    border-bottom-color: rgba(255,255,255,0.06);
  }
}

/* =====================================================================
   DOCS ENHANCEMENT LAYER  (progressive — built by docs-nav.js)
   Reading progress · right-rail TOC · heading anchors · copy buttons ·
   breadcrumb · prev/next pager · surface depth · sidebar/card polish.
   All additive; respects the muted reading palette (no brand-blue recolor).
   ===================================================================== */

/* ---- Reading surface depth (whisper-subtle, neutral, not a recolor) ---- */
body.docs-page,
body.docs-hub {
  background:
    radial-gradient(120% 60% at 50% -8%, rgba(var(--accent-rgb), 0.08) 0%, rgba(var(--accent-rgb), 0) 60%) no-repeat,
    linear-gradient(180deg, #f4fbff 0%, var(--bg-subtle) 160px, var(--bg) 380px, #ffffff 800px) no-repeat;
  background-color: var(--bg);
}
[data-theme="dark"] body.docs-page,
[data-theme="dark"] body.docs-hub {
  background:
    radial-gradient(circle at top, rgba(30,45,65,0.5) 0%, rgba(15,23,36,0) 34%) no-repeat,
    linear-gradient(180deg, #0f1724 0%, #111b2a 22%, #151e2d 100%) no-repeat;
  background-color: #0f1724;
}

/* ---- Reading progress bar ---- */
.doc-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0;
  z-index: 200;
  border-radius: 0 2px 2px 0;
  background: linear-gradient(90deg, var(--blue) 0%, var(--blue-deep) 100%);
  box-shadow: 0 0 10px rgba(var(--accent-rgb), 0.5);
  transition: width 0.08s linear;
  pointer-events: none;
}
[dir="rtl"] .doc-progress { left: auto; right: 0; border-radius: 2px 0 0 2px; }

/* ---- Breadcrumb ---- */
.doc-crumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
}
.doc-crumb a { color: var(--text-secondary); text-decoration: none; transition: color 0.2s ease; }
.doc-crumb a:hover { color: var(--blue-deep); }
.doc-crumb .doc-crumb-sep { opacity: 0.5; user-select: none; }
.doc-crumb .doc-crumb-current { color: var(--text-primary); font-weight: 600; }

/* ---- Heading anchors ---- */
.m h2, .m h3 { scroll-margin-top: 90px; }
.m :where(h2, h3) > .head-anchor {
  display: inline-flex;
  align-items: center;
  margin-left: 8px;
  font-size: 0.74em;
  font-weight: 600;
  color: var(--blue);
  text-decoration: none;
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity 0.18s ease, transform 0.18s ease, color 0.18s ease;
  vertical-align: middle;
}
.m :where(h2, h3):hover > .head-anchor,
.m :where(h2, h3) > .head-anchor:focus-visible { opacity: 0.7; transform: translateX(0); }
.m :where(h2, h3) > .head-anchor:hover { opacity: 1; color: var(--blue-deep); }
[dir="rtl"] .m :where(h2, h3) > .head-anchor { margin-left: 0; margin-right: 8px; }

/* ---- Real copy button on code blocks ---- */
.m pre { position: relative; padding-top:48px; }
.code-copy {
  position: absolute;
  top: 8px;
  right: 10px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  min-height: 32px;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-card);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  color: var(--blue-deep);
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  transform: translateY(-2px);
  transition: opacity 0.18s ease, transform 0.18s ease, background 0.18s ease, border-color 0.18s ease;
  z-index: 3;
}
[dir="rtl"] .code-copy { right: auto; left: 10px; }
.code-copy svg { width: 13px; height: 13px; }
.m pre:hover .code-copy,
.m pre:focus-within .code-copy { opacity: 1; transform: translateY(0); }
.code-copy:hover { border-color: var(--border-strong); background: var(--bg-card-hover); }
.code-copy:focus-visible { opacity: 1; outline: 2px solid var(--blue); outline-offset: 2px; }
.code-copy.is-copied { color: #22a06b; border-color: rgba(34,160,107,0.32); }
[data-theme="dark"] .code-copy.is-copied { color: #4ade80; border-color: rgba(74,222,128,0.32); }
.code-copy-status { font:13px/1.7 var(--sans); color:var(--text-secondary); }
.code-copy-status:not(.is-error) { position:absolute; width:1px; height:1px; margin:-1px; overflow:hidden; clip-path:inset(50%); white-space:nowrap; }
.code-copy-status.is-error { display:block; margin-top:12px; white-space:normal; }
/* 窄屏和触摸设备直接显示现有复制动作，并给代码正文保留操作空间。 */
@media (max-width: 768px), (hover: none) {
  .m pre { padding-top:60px; }
  .code-copy { min-height:44px; opacity:1; transform:none; }
}

/* ---- Right-rail "On this page" TOC (content-anchored, wide screens only) ----
   The left sidebar + content live at fixed physical positions in every locale
   (CSS uses physical `left`, so the ug RTL page keeps the same layout). The TOC
   therefore always sits in the physical-right gutter. On >=1440px we cap the
   content column to the reading width so wide blocks don't run under the rail. */
.doc-toc { display: none; }
/* 窄屏保留可折叠的本页目录，长教程无需滚回开头寻找章节。 */
.doc-toc-inline { margin:20px 0 28px; padding:12px 16px; border:1px solid var(--border); border-radius:12px; background:var(--bg-card); }
.doc-toc-inline summary { cursor:pointer; color:var(--blue-deep); font-weight:600; }
.doc-toc-inline a { display:block; padding:8px 0; color:var(--text-secondary); text-decoration:none; }
.doc-toc-inline a.lv3 { padding-inline-start:16px; }
@media (min-width: 1280px) {
  :root {
    --doc-grid-edge: max(32px, calc((100% - 1240px) / 2));
  }
  .docs-page:not(.content-page) .sb {
    left: var(--doc-grid-edge);
    border-left: 1px solid rgba(18, 50, 76, 0.06);
  }
  [data-theme="dark"] .docs-page:not(.content-page) .sb {
    border-left-color: rgba(255, 255, 255, 0.08);
  }
  .docs-page:not(.content-page) .m {
    margin-left: calc(var(--doc-grid-edge) + 240px);
    padding: 112px 64px 104px 48px;
    max-width: 960px;
  }
  .docs-page:not(.content-page) .sb ~ .footer {
    position: relative;
    z-index: 50;
    margin-left: 0;
    padding-left: max(32px, var(--doc-grid-edge));
    padding-right: max(32px, var(--doc-grid-edge));
  }
}

@media(min-width:1480px) { .doc-toc-inline { display:none; } }
@media (min-width: 1480px) {
  .docs-page:not(.content-page) .m {
    max-width: 760px;
    padding: 112px 48px 104px 40px;
  }
  .docs-page .m > :where(pre, table, .page-lead, .doc-shot, .doc-gallery) {
    max-width: 100%;
  }
  .docs-page:not(.content-page) .sb ~ .footer {
    position: relative;
    z-index: 50;
    margin-left: 0;
    padding-left: max(32px, var(--doc-grid-edge));
    padding-right: max(32px, var(--doc-grid-edge));
  }
  .docs-page:not(.content-page) .sb ~ .footer .footer-main,
  .docs-page:not(.content-page) .sb ~ .footer .footer-bottom {
    max-width: 1240px;
    margin-left: auto;
    margin-right: auto;
  }
  .docs-page .doc-toc {
    display: block;
    position: fixed;
    top: 96px;
    left: auto;
    right: var(--doc-grid-edge);
    width: 200px;
    max-height: calc(100vh - 140px);
    padding: 8px 4px 8px 16px;
    overflow-y: auto;
    border-left: 1px solid var(--border);
    overscroll-behavior: contain;
  }
  [dir="rtl"] .docs-page .doc-toc {
    /* same physical-right gutter; separator (border-left) still faces content,
       just give right-aligned Uyghur text some breathing room from the edge */
    right: auto;
    left: var(--doc-grid-edge);
    border-left: none;
    border-right: 1px solid var(--border);
    padding: 8px 16px 8px 4px;
  }
  /* RTL 仍使用左侧导航和右侧目录，正文容器须固定在二者之间。 */
  [dir="rtl"] .docs-page:not(.content-page) .m {
    max-width: 760px;
    margin-left: 0;
    margin-right: calc(var(--doc-grid-edge) + 240px);
  }
}
.doc-toc-title {
  margin-bottom: 12px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.6px;
  text-transform: uppercase;
  color: var(--blue-deep);
  opacity: 0.72;
}
.doc-toc a {
  display: block;
  padding: 5px 10px;
  margin-bottom: 1px;
  border-radius: 8px;
  border-left: 2px solid transparent;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 13.5px;
  line-height: 1.55;
  transition: color 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}
.doc-toc a.lv3 { padding-inline-start: 22px; font-size: 13px; }
.doc-toc a:hover { color: var(--text-primary); background: rgba(var(--accent-light-rgb), 0.22); }
.doc-toc a.is-active {
  color: var(--blue-deep);
  border-left-color: var(--blue);
  background: rgba(var(--accent-light-rgb), 0.28);
  font-weight: 600;
}
[dir="rtl"] .doc-toc a { border-left: none; border-right: 2px solid transparent; }
[dir="rtl"] .doc-toc a.lv3 { padding-left: 10px; padding-right: 22px; }
[dir="rtl"] .doc-toc a.is-active { border-right-color: var(--blue); }

/* ---- Prev / Next pager (built from sidebar order) ---- */
.doc-pager {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  max-width: var(--reading-width);
  margin: 56px 0 8px;
}
.doc-pager a {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 20px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--bg-card);
  text-decoration: none;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}
.doc-pager a:hover {
  border-color: var(--border-strong);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(var(--accent-rgb), 0.08);
}
.doc-pager a.is-next { text-align: right; align-items: flex-end; }
[dir="rtl"] .doc-pager a.is-next { text-align: left; align-items: flex-start; }
[dir="rtl"] .doc-pager a.is-prev { text-align: right; align-items: flex-end; }
.doc-pager-dir { font-size: 12px; font-weight: 600; letter-spacing: 0.4px; color: var(--text-muted); }
.doc-pager-label { font-size: 16px; font-weight: 700; color: var(--blue-deep); }
.doc-pager a:hover .doc-pager-label { text-decoration: none; }
.doc-pager .is-prev:only-child { grid-column: 1; }
.doc-pager .is-next:only-child { grid-column: 2; }
@media (max-width: 600px) { .doc-pager { grid-template-columns: 1fr; } .doc-pager .is-next:only-child { grid-column: 1; } }

/* ---- Sidebar active-indicator polish (pill highlight replaces harsh vertical bar) ---- */
.sb a { position: relative; }
.sb a.on::before { display: none; }

/* ---- Docs hub card hover affordance (cards previously had no hover motion) ---- */
.docs-hub .card {
  position: relative;
  transition: border-color 0.22s ease, background 0.22s ease, transform 0.22s ease, box-shadow 0.22s ease;
}
.docs-hub .card:hover {
  transform: translateY(-3px);
  border-color: var(--border-strong);
  box-shadow: 0 18px 40px rgba(var(--accent-rgb), 0.1);
}
.docs-hub .card .card-icon { transition: background 0.22s ease, border-color 0.22s ease, transform 0.22s ease; }
.docs-hub .card:hover .card-icon { transform: scale(1.06); border-color: rgba(var(--accent-rgb), 0.24); }
.docs-hub .card::after {
  content: "→";
  position: absolute;
  top: 28px;
  right: 28px;
  font-size: 18px;
  color: var(--blue-deep);
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity 0.22s ease, transform 0.22s ease;
}
.docs-hub .card:hover::after { opacity: 0.85; transform: translateX(0); }
[dir="rtl"] .docs-hub .card::after { content: "←"; right: auto; left: 28px; transform: translateX(6px); }
[dir="rtl"] .docs-hub .card:hover::after { transform: translateX(0); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
  .doc-progress, .head-anchor, .code-copy, .doc-pager a,
  .docs-hub .card, .docs-hub .card-icon, .docs-hub .card::after { transition: none !important; }
}

/* ---- Inner doc pages: keep the footer clear of the fixed left sidebar AND the
   fixed right-rail TOC. Only article pages have aside.sb (legal/hub pages don't,
   so they keep the centered footer). Guarded to >=769px since the sidebar is
   hidden on mobile (where .sb still exists in the DOM but is display:none). ---- */
@media (min-width: 769px) {
  .sb ~ .footer {
    position: relative;
    z-index: 50;
    margin-left: 0;
    padding: 28px max(32px, calc((100% - 1240px) / 2));
  }
  .sb ~ .footer .footer-main,
  .sb ~ .footer .footer-bottom {
    max-width: 1240px;
    margin-left: auto;
    margin-right: auto;
  }
  .sb ~ .footer .footer-grid {
    grid-template-columns: repeat(4, minmax(130px, 1fr));
    gap: 28px;
  }
}

@media (max-width:768px) {
  .sb ~ .footer { padding-inline:22px; }
}

@media (min-width: 769px) and (max-width: 1100px) {
  .sb ~ .footer .footer-main,
  .sb ~ .footer .footer-bottom {
    width: auto;
    max-width: none;
    margin-left: 0;
    margin-right: 0;
  }

  .sb ~ .footer .footer-main {
    flex-direction: column;
    gap: 24px;
  }

  .sb ~ .footer .footer-brand {
    max-width: none;
  }

  .sb ~ .footer .footer-columns {
    width: 100%;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .sb ~ .footer .footer-grid {
    width: 100%;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
}


/* =====================================================================
   TOP-LEVEL CONTENT PAGE SYSTEM
   Shared geometry for About, Changelog, Privacy, Terms, and service notes.
   ===================================================================== */
.content-page .tn,
.content-page .topnav,
.changelog-page .tn {
  padding-inline: max(32px, calc((100% - 1240px) / 2));
}

.content-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.content-page .content-main {
  width: min(calc(100% - 64px), 1240px);
  max-width: 1240px;
  margin: 0 auto;
  padding: 136px 0 112px;
  flex: 1 0 auto;
}

.content-page .content-main > :where(h2, h3, p, ul, ol, hr, pre, table, .tip) {
  width: 100%;
  max-width: 1240px;
  margin-left: 0;
  margin-right: 0;
}

.content-page .page-lead {
  position: relative;
  width: 100%;
  max-width: 1240px;
  margin: 0 0 44px;
  padding: 0 0 32px;
  border: 0;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  background: none;
  box-shadow: none;
}

.content-page .page-lead::before {
  display: none;
}

.content-page .page-lead h1 {
  max-width: 100%;
  margin-bottom: 12px;
  font-size: clamp(34px, 4vw, 44px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.content-page .page-lead .sub {
  max-width: 780px;
  margin-bottom: 0;
  font-size: 17px;
  line-height: 1.68;
  color: var(--text-secondary);
}

.content-page .content-main > h2 {
  margin-top: 48px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-soft, rgba(var(--accent-rgb), 0.12));
  font-size: 24px;
  font-weight: 700;
  line-height: 1.32;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.content-page .content-main > h2:first-of-type {
  margin-top: 0;
}

.content-page .content-main > h3 {
  margin-top: 32px;
  margin-bottom: 12px;
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--text-primary);
}

.content-page .content-main > :where(p, ul, ol) {
  max-width: 76ch;
  margin-left: 0;
  margin-right: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--text-secondary);
}

.content-page .content-main li {
  padding-left: 3px;
}

.content-page .content-main li::marker {
  color: var(--blue);
}

.content-page .tip {
  max-width: 960px;
  margin-top: 24px;
  margin-bottom: 36px;
  margin-left: 0;
  margin-right: 0;
  padding: 18px 22px;
  border-left-width: 3px;
  border-radius: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left-width: 3px;
  border-left-color: var(--blue);
  box-shadow: 0 4px 16px rgba(var(--accent-rgb), 0.04);
}

.content-page table {
  max-width: 1240px;
  margin-top: 24px;
  margin-bottom: 36px;
  margin-left: 0;
  margin-right: 0;
  border-collapse: collapse;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-card);
  box-shadow: 0 4px 18px rgba(18, 50, 76, 0.04);
  font-size: 14.5px;
}

.content-page th,
.content-page td {
  padding: 15px 18px;
  line-height: 1.7;
}

.content-page .footer {
  margin-top: 0;
  flex-shrink: 0;
}

/* Changelog: each heading and its following list form one release card. */
.changelog-page .content-main {
  width: min(100%, 1040px);
}

.changelog-page .content-main > h2 {
  position: relative;
  max-width: 840px;
  margin: 22px auto 0;
  padding: 23px 28px 15px 68px;
  border: 1px solid rgba(var(--accent-rgb), 0.14);
  border-bottom: 0;
  border-radius: 22px 22px 0 0;
  background: rgba(255, 255, 255, 0.94);
  font-size: 21px;
  letter-spacing: -0.012em;
}

.changelog-page .content-main > h2:first-of-type {
  margin-top: 0;
  background:
    linear-gradient(135deg, rgba(var(--accent-light-rgb), 0.2), transparent 68%),
    rgba(255, 255, 255, 0.97);
}

.changelog-page .content-main > h2::before {
  content: "";
  position: absolute;
  top: 31px;
  left: 31px;
  width: 10px;
  height: 10px;
  border: 3px solid rgba(255, 255, 255, 0.96);
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 1px rgba(var(--accent-rgb), 0.28), 0 4px 12px rgba(var(--accent-rgb), 0.18);
}

.changelog-page .content-main > h2::after {
  content: "";
  position: absolute;
  top: 48px;
  bottom: -20px;
  left: 38px;
  width: 1px;
  background: rgba(var(--accent-rgb), 0.18);
}

.changelog-page .content-main > h2 + ul {
  max-width: 840px;
  margin: 0 auto 20px;
  padding: 0 28px 24px 68px;
  border: 1px solid rgba(var(--accent-rgb), 0.14);
  border-top: 0;
  border-radius: 0 0 22px 22px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 16px 38px rgba(var(--ink-rgb), 0.055);
}

.changelog-page .content-main > h2 + ul li {
  margin-bottom: 7px;
  color: var(--text-secondary);
}

.changelog-page .content-main > h2 + ul li:last-child {
  margin-bottom: 0;
}

/* About: 1240px grid aligned with navbar and footer */
.about-page .content-main {
  width: min(calc(100% - 64px), 1240px);
  max-width: 1240px;
  margin: 0 auto;
  padding: 136px 0 112px;
}

.about-page .content-main > :where(h2, h3, p, ul, ol, hr, pre, table, .tip) {
  width: 100%;
  max-width: 100%;
  margin-left: 0;
  margin-right: 0;
}

.about-page .page-lead {
  max-width: 100%;
  margin: 0 0 48px;
  padding: 0 0 36px;
  border: 0;
  border-radius: 0;
  background: none;
  box-shadow: none;
  border-bottom: 1px solid var(--border);
}

.about-page .page-lead::before {
  display: none;
}

.about-page .page-lead-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.about-page .page-lead-titles {
  flex: 1 1 640px;
  max-width: 820px;
}

.about-page .page-lead h1 {
  font-size: clamp(34px, 4vw, 44px);
  font-weight: 800;
  letter-spacing: -0.035em;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.about-page .page-lead .sub {
  font-size: 17px;
  line-height: 1.68;
  color: var(--text-secondary);
  margin-bottom: 0;
}

.about-hero-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 20px;
}

.about-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  background: var(--bg-subtle);
  border: 1px solid var(--border-strong);
}

.about-status-pill .pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.25);
  animation: pulseLive 2.4s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

.about-trust-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 12.5px;
  color: var(--text-muted);
  background: var(--bg-subtle);
  border: 1px solid var(--border-soft);
}

.about-hero-links {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-top: 8px;
  flex-shrink: 0;
}

.about-btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  color: #ffffff !important;
  background: var(--blue-deep);
  text-decoration: none;
  border: 1px solid transparent;
  transition: background-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

.about-btn-primary:hover {
  background: #23516f;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(46, 101, 136, 0.25);
}

/* 深色主题的主按钮底色较浅，默认用深字；悬浮切深底时再恢复浅字。 */
[data-theme="dark"] :is(.about-btn-primary, .changelog-btn-primary) {
  color: var(--bg) !important;
}

[data-theme="dark"] :is(.about-btn-primary, .changelog-btn-primary):hover {
  color: var(--text-primary) !important;
}

.about-btn-subtle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 16px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.about-btn-subtle:hover {
  color: var(--text-primary);
  border-color: var(--border-strong);
  background: var(--bg-card-hover);
}

/* Story card */
.about-story-card {
  margin: 18px 0 44px;
  padding: 28px 32px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  box-shadow: 0 4px 20px rgba(18, 50, 76, 0.03);
}

.about-story-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  color: var(--blue-deep);
  background: var(--blue-pale);
  border: 1px solid rgba(var(--accent-rgb), 0.22);
  margin-bottom: 14px;
}

[data-theme="dark"] .about-story-badge {
  color: var(--blue-light);
  background: rgba(var(--accent-rgb), 0.15);
  border-color: rgba(var(--accent-rgb), 0.3);
}

.about-story-card p {
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--text-secondary);
  margin: 0 0 14px;
}

.about-story-card p:last-child {
  margin-bottom: 0;
}

/* 7 repos: 12-column balanced architectural matrix across 1240px */
.about-page .content-main > ul:first-of-type,
.about-page .about-repos {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 16px;
  padding-left: 0;
  list-style: none;
  margin: 20px 0 48px;
}

/* Row 1: 4 core engine/runtime repos (3 cols each = 12 cols) */
.about-page .content-main > ul:first-of-type li:nth-child(-n+4),
.about-page .about-repos li:nth-child(-n+4) {
  grid-column: span 3;
}

/* Row 2: 3 client/UI repos (4 cols each = 12 cols) */
.about-page .content-main > ul:first-of-type li:nth-child(n+5),
.about-page .about-repos li:nth-child(n+5) {
  grid-column: span 4;
}

.about-page .about-story-card,
.about-page .about-repos,
.about-page .about-arch-grid,
.about-page .about-contact {
  width: 100%;
  max-width: 1240px;
  box-sizing: border-box;
}

.about-page .content-main > ul:first-of-type li,
.about-page .about-repos li {
  margin: 0;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--bg-card);
  box-shadow: 0 4px 16px rgba(18, 50, 76, 0.04);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 12px;
  position: relative;
  cursor: pointer;
  transition: transform 0.22s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.22s ease, box-shadow 0.22s ease, background-color 0.22s ease;
}

.about-page .content-main > ul:first-of-type li:hover,
.about-page .about-repos li:hover {
  transform: translateY(-3px);
  border-color: rgba(63, 143, 212, 0.38);
  box-shadow: 0 16px 36px rgba(95, 179, 234, 0.16);
  background: var(--bg-card-hover);
}

.repo-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.repo-name {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  text-decoration: none;
  font-family: var(--mono);
  color: var(--blue-deep);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.repo-name::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 18px;
  z-index: 1;
}

.about-page .about-repos li:hover .repo-name {
  color: var(--blue-deep);
}

.repo-arrow {
  display: inline-block;
  font-size: 13px;
  opacity: 0.7;
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.2s ease, color 0.2s ease;
}

.about-page .about-repos li:hover .repo-arrow {
  transform: translate(3px, -3px);
  opacity: 1;
  color: var(--blue-deep);
}

[data-theme="dark"] .about-page .about-repos li:hover .repo-arrow {
  color: var(--blue-light);
}

.repo-badge {
  position: relative;
  z-index: 2;
  padding: 3px 9px;
  border-radius: 6px;
  font-size: 11.5px;
  font-weight: 600;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  white-space: nowrap;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.about-page .about-repos li:hover .repo-badge {
  background: rgba(63, 143, 212, 0.1);
  border-color: rgba(63, 143, 212, 0.25);
  color: var(--blue-deep);
}

[data-theme="dark"] .about-page .about-repos li:hover .repo-badge {
  background: rgba(95, 179, 234, 0.15);
  border-color: rgba(95, 179, 234, 0.3);
  color: var(--blue-light);
}

.repo-desc {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--text-secondary);
  margin: 0;
  flex-grow: 1;
}

.repo-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11.5px;
  color: var(--text-muted);
  border-top: 1px solid var(--border-soft);
  padding-top: 10px;
  margin-top: 4px;
}

/* Architecture Pillars Grid */
.about-arch-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 24px 0 48px;
}

.about-arch-card {
  padding: 24px 22px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  box-shadow: 0 2px 10px rgba(18, 50, 76, 0.03);
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.about-arch-card:hover {
  transform: translateY(-2px);
  border-color: rgba(95, 179, 234, 0.3);
  box-shadow: 0 8px 24px rgba(95, 179, 234, 0.08);
}

.arch-card-icon {
  font-size: 24px;
  margin-bottom: 12px;
}

.about-arch-card h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--text-primary);
}

.about-arch-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.68;
  color: var(--text-secondary);
}

.about-arch-card code {
  font-family: var(--mono);
  font-size: 12.5px;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  color: var(--blue-deep);
}

[data-theme="dark"] .about-arch-card code {
  color: var(--blue-light);
}

/* 3 Contact channels: 3-column balanced cards across 1240px */
.about-page .content-main > ul:last-of-type,
.about-page .about-contact {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  list-style: none;
  padding-left: 0;
  margin: 20px 0 48px;
}

.about-page .content-main > ul:last-of-type li,
.about-page .about-contact li {
  margin: 0;
  padding: 22px 24px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--bg-card);
  box-shadow: 0 2px 10px rgba(18, 50, 76, 0.03);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.contact-label {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

.about-contact a {
  color: var(--blue-deep);
  font-weight: 700;
  font-family: var(--mono);
  font-size: 15px;
  text-decoration: none;
  word-break: break-all;
}

.about-contact a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.contact-note {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

[data-theme="dark"] .about-contact a {
  color: var(--blue-light);
}

@media (max-width: 1024px) {
  .about-page .content-main > ul:first-of-type li:nth-child(-n+4),
  .about-page .content-main > ul:first-of-type li:nth-child(n+5),
  .about-page .about-repos li:nth-child(-n+4),
  .about-page .about-repos li:nth-child(n+5) {
    grid-column: span 6;
  }
  .about-arch-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .about-page .content-main > ul:last-of-type,
  .about-page .about-contact {
    grid-template-columns: 1fr;
  }
  .repo-card-head,
  .repo-meta,
  .about-hero-links {
    flex-wrap: wrap;
  }
  .about-page .about-repos li,
  .about-page .about-contact li {
    min-width: 0;
  }
}

@media (max-width: 640px) {
  .about-page .content-main > ul:first-of-type li:nth-child(-n+4),
  .about-page .content-main > ul:first-of-type li:nth-child(n+5),
  .about-page .about-repos li:nth-child(-n+4),
  .about-page .about-repos li:nth-child(n+5) {
    grid-column: span 12;
  }
  .about-arch-grid {
    grid-template-columns: 1fr;
  }
  .about-page .page-lead-top {
    flex-direction: column;
    gap: 18px;
  }
  /* 纵向排列时按内容定高，横向布局的 basis 不再作为高度。 */
  .about-page .page-lead-titles {
    flex-basis: auto;
  }
}

.about-hero-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 20px;
}

.about-hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 13px;
  border-radius: 999px;
  border: 1px solid rgba(var(--accent-rgb), 0.16);
  background: rgba(255, 255, 255, 0.75);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}

.about-hero-pill .pill-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.2);
}

[data-theme="dark"] .about-hero-pill {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.1);
  color: var(--text-secondary);
}

/* Legal pages: reading hierarchy and typography polish */
.legal-page .page-lead {
  position: relative;
}

.legal-page .content-main > h2 {
  margin-top: 48px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  font-size: 22px;
  letter-spacing: -0.015em;
  color: var(--text-primary);
}

.legal-page .content-main p {
  color: var(--text-secondary);
  line-height: 1.85;
}

.legal-page .content-main code {
  font-size: 0.9em;
  padding: 2px 7px;
  border-radius: 6px;
  background: var(--blue-pale);
  color: var(--blue-dark);
}

[data-theme="dark"] .legal-page .content-main code {
  background: rgba(95, 179, 234, 0.15);
  color: var(--blue-light);
}

[data-theme="dark"] .content-page .page-lead {
  background:
    radial-gradient(circle at 92% 4%, rgba(var(--accent-rgb), 0.12), transparent 36%),
    linear-gradient(145deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0.025));
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.04) inset, 0 24px 64px rgba(0, 0, 0, 0.2);
}

[data-theme="dark"] .content-page .tip,
[data-theme="dark"] .changelog-page .content-main > h2,
[data-theme="dark"] .changelog-page .content-main > h2 + ul,
[data-theme="dark"] .about-page .content-main > ul li {
  background: rgba(255, 255, 255, 0.035);
}

[data-theme="dark"] .changelog-page .content-main > h2:first-of-type {
  background:
    linear-gradient(135deg, rgba(var(--accent-rgb), 0.09), transparent 68%),
    rgba(255, 255, 255, 0.045);
}

@media (max-width: 1100px) {
  .content-page .tn-burger {
    display: block;
  }

  .content-page .tn .tn-r {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 20px;
    border-bottom: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
  }

  .content-page .tn .tn-r.open {
    display: flex;
  }

  .content-page .tn .tn-r > a {
    padding: 12px 0;
    border-bottom: 1px solid var(--border-soft);
  }

  .content-page .tn .tn-r a.nav-cta {
    margin-top: 8px;
    padding: 12px 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
    text-align: left;
  }

  .content-page .lang-menu {
    width: 100%;
    margin: 8px 0;
    display: flex;
    flex-direction: column;
    align-items: stretch;
  }

  .content-page .lang-trigger {
    width: 100%;
    justify-content: center;
    box-shadow: none;
  }

  .content-page .lang-menu-list {
    position: static;
    display: none;
    width: 100%;
    margin-top: 8px;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .content-page .lang-menu.open .lang-menu-list {
    display: block;
    transform: none;
  }

  .content-page .tn .tn-r .lang-menu-list a,
  .content-page .tn .tn-r .lang-menu-list a.is-active {
    justify-content: center;
    padding: 10px 12px;
    border-bottom: 0;
  }

  [data-theme="dark"] .content-page .tn .tn-r {
    background: rgba(15, 23, 36, 0.96);
    border-bottom-color: rgba(255, 255, 255, 0.06);
  }
}

@media (max-width: 768px) {
  .content-page .content-main {
    width: 100%;
    padding: 92px 16px 68px;
  }

  .content-page .page-lead {
    margin-bottom: 42px;
    padding: 29px 25px 31px;
    border-radius: 23px;
  }

  .content-page .page-lead::before {
    left: 25px;
    width: 42px;
  }

  .content-page .page-lead h1 {
    margin-bottom: 11px;
    font-size: clamp(29px, 9vw, 37px);
  }

  .content-page .page-lead .sub {
    font-size: 16px;
    line-height: 1.72;
  }

  .content-page .content-main > h2 {
    margin-top: 42px;
    font-size: 22px;
  }

  .content-page .content-main p,
  .content-page .content-main li {
    font-size: 16px;
    line-height: 1.82;
  }

  .content-page .tip {
    margin-bottom: 36px;
    padding: 16px 17px;
  }

  .content-page table {
    width: 100%;
    max-width: 100%;
  }

  .content-page th,
  .content-page td {
    padding: 12px 13px;
  }

  .changelog-page .page-lead {
    margin-bottom: 32px;
  }

  .changelog-page .content-main > h2 {
    margin-top: 16px;
    padding: 20px 18px 13px 51px;
    border-radius: 18px 18px 0 0;
    font-size: 19px;
  }

  .changelog-page .content-main > h2::before {
    top: 27px;
    left: 22px;
    width: 9px;
    height: 9px;
  }

  .changelog-page .content-main > h2::after {
    top: 43px;
    left: 29px;
  }

  .changelog-page .content-main > h2 + ul {
    margin-bottom: 16px;
    padding: 0 18px 20px 51px;
    border-radius: 0 0 18px 18px;
  }

  .about-page .content-main > ul {
    grid-template-columns: 1fr;
  }
}

/* 文档中心用紧凑主题网格；阅读页让标题直接衔接正文。 */
.docs-hub .hero h1 { font-size:40px; line-height:1.3; }
.docs-hub .hero p { max-width:720px; margin:0; font-size:18px; text-wrap:pretty; }
.docs-hub .hero-kicker { padding:0; border:0; background:none; letter-spacing:0; text-transform:none; margin-bottom:12px; font-size:14px; }
.docs-hub .hero-meta { justify-content:flex-start; gap:12px; margin-top:20px; }
.docs-hub .hero-pill { display:inline-flex; align-items:center; padding:5px 14px; border-radius:999px; font-size:13px; font-weight:500; color:var(--blue-deep); background:rgba(var(--accent-rgb),0.08); border:1px solid rgba(var(--accent-rgb),0.14); }
[data-theme="dark"] .docs-hub .hero-pill { color:#7cc4f0; background:rgba(95,179,234,0.12); border-color:rgba(95,179,234,0.2); }
.docs-hub .cards { max-width:1240px; margin:0 auto; padding:0 0 48px; grid-template-columns:repeat(6,minmax(0,1fr)); gap:16px; }
.docs-hub .card { display:grid; grid-template-columns:44px minmax(0,1fr); grid-column:span 2; column-gap:16px; align-content:start; padding:20px 22px; border:1px solid var(--border); border-radius:18px; background:var(--bg-card); transition:transform .22s ease,border-color .22s ease,box-shadow .22s ease,background .22s ease; }
.docs-hub .card .card-icon { grid-row:1 / 3; margin:0; transition:transform .22s ease; }
.docs-hub .card-title { font-size:17px; font-weight:700; line-height:1.45; margin-bottom:4px; }
.docs-hub .card-desc { font-size:14px; line-height:1.6; color:var(--text-secondary); }
.docs-hub .card:hover { transform:translateY(-2px); border-color:var(--border-strong); box-shadow:0 12px 28px rgba(var(--accent-rgb),.1); background:var(--bg-card-hover); }
.docs-hub .card:hover .card-icon { transform:scale(1.05); }
.docs-hub .card::after { display:none; }

/* ---- Docs Hub Grouped Section Architecture ---- */
.docs-hub .doc-hub-group { max-width:1240px; margin:0 auto 48px; padding:0; }
.docs-hub .doc-hub-group-header { margin-bottom:20px; }
.docs-hub .doc-hub-group-title { margin:0 0 6px; padding:0; border:none; font-size:24px; font-weight:700; letter-spacing:-0.015em; color:var(--text-primary); }
.docs-hub .doc-hub-group-desc { margin:0; font-size:15px; line-height:1.7; color:var(--text-secondary); }

.docs-hub .cards--core { grid-template-columns:repeat(4,minmax(0,1fr)); padding:0; gap:16px; margin-bottom:0; }
.docs-hub .cards--core .card { grid-column:span 1; }

.docs-hub .card--featured { display:grid; grid-template-columns:48px minmax(0,1fr) auto; align-items:center; column-gap:20px; margin-bottom:20px; padding:22px 26px; border-radius:20px; border:1px solid rgba(var(--accent-rgb),0.22); background:linear-gradient(135deg,rgba(var(--accent-light-rgb),0.22) 0%,rgba(var(--accent-light-rgb),0.04) 50%,var(--bg-card) 100%); box-shadow:0 12px 32px rgba(var(--accent-rgb),0.06); text-decoration:none; transition:transform .22s ease,border-color .22s ease,box-shadow .22s ease; }
.docs-hub .card--featured:hover { transform:translateY(-2px); border-color:rgba(var(--accent-rgb),0.4); box-shadow:0 16px 40px rgba(var(--accent-rgb),0.12); }
.docs-hub .card--featured .card-icon { grid-row:auto; width:48px; height:48px; border-radius:12px; background:rgba(var(--accent-light-rgb),0.35); display:flex; align-items:center; justify-content:center; }
.docs-hub .card--featured .card-body { display:flex; flex-direction:column; gap:4px; }
.docs-hub .card--featured .card-tag { align-self:flex-start; font-size:11px; font-weight:700; letter-spacing:0.04em; padding:2px 8px; border-radius:6px; color:var(--blue-deep); background:rgba(var(--accent-rgb),0.12); }
.docs-hub .card--featured .card-title { margin:0; font-size:19px; font-weight:700; color:var(--text-primary); }
.docs-hub .card--featured .card-desc { margin:0; font-size:14px; line-height:1.65; color:var(--text-secondary); }
.docs-hub .card--featured .card-arrow { display:flex; align-items:center; justify-content:center; width:36px; height:36px; border-radius:50%; background:rgba(var(--accent-rgb),0.08); color:var(--blue-deep); font-size:16px; font-weight:600; transition:transform .22s ease,background .22s ease,color .22s ease; }
.docs-hub .card--featured:hover .card-arrow { transform:translateX(4px); background:var(--blue-deep); color:#ffffff; }

.docs-hub .cards--sub { grid-template-columns:repeat(4,minmax(0,1fr)); padding:0; gap:16px; margin-bottom:0; }
.docs-hub .cards--sub .card { grid-column:span 1; }

[data-theme="dark"] .docs-hub .card--featured { background:linear-gradient(135deg,rgba(30,45,65,0.7) 0%,rgba(21,30,45,0.5) 100%); border-color:rgba(95,179,234,0.25); box-shadow:0 12px 32px rgba(0,0,0,0.35); }
[data-theme="dark"] .docs-hub .card--featured .card-tag { color:#7cc4f0; background:rgba(95,179,234,0.16); }
[data-theme="dark"] .docs-hub .card--featured .card-arrow { background:rgba(255,255,255,0.08); color:#7cc4f0; }
[data-theme="dark"] .docs-hub .card--featured:hover .card-arrow { background:#5fb3ea; color:#0f1724; }

[data-theme="dark"] .footer-wechat img { border:1px solid rgba(255,255,255,0.12); }
[data-theme="dark"] .uf-zone { fill:rgba(30,45,65,0.35); stroke:rgba(255,255,255,0.08); }
[data-theme="dark"] .uf-card { fill:rgba(21,30,45,0.85); stroke:rgba(95,179,234,0.25); }
[data-theme="dark"] .uf-ct { fill:#e8ecf0; }
[data-theme="dark"] .uf-cs { fill:#8b95a2; }
[data-theme="dark"] .uf-zl { fill:#7cc4f0; }
[data-theme="dark"] .uf-grp { fill:#7cc4f0; }
[data-theme="dark"] .uf-flow { stroke:#5fb3ea; }
[data-theme="dark"] .uf-loop { stroke:#7cc4f0; }
[data-theme="dark"] .uf-loopt { fill:#7cc4f0; }

@media(max-width:1304px) {
  .docs-hub .hero,
  .docs-hub .cards,
  .docs-hub .doc-hub-group,
  .docs-hub .doc-gallery { padding-inline:32px; }
}

/* 尾行不足三项时居中排列，仅针对传统 3 列网格生效 */
@media(min-width:1001px) {
  .docs-hub .cards:not(.cards--core):not(.cards--sub) .card:last-child:nth-child(3n+1) { grid-column:3 / span 2; }
  .docs-hub .cards:not(.cards--core):not(.cards--sub) .card:nth-last-child(2):nth-child(3n+1) { grid-column:2 / span 2; }
}
.docs-page:not(.content-page) .m > .page-lead { padding:0 0 24px; margin-bottom:32px; border:0; background:none; box-shadow:none; overflow:visible; }
.docs-page:not(.content-page) .m > .page-lead::after { content:''; position:absolute; inset-inline:0; bottom:0; height:1px; background:var(--border); }
.docs-page:not(.content-page) .page-lead .page-kicker { letter-spacing:0; text-transform:none; margin-bottom:12px; }
.page-lead .keep-phrase { display:inline-block; white-space:nowrap; }
.docs-page:not(.content-page) .page-lead .sub { margin-bottom:0; font-size:18px; line-height:1.8; }
.docs-page:not(.content-page) .page-lead p:last-child { margin-bottom:0; }
.docs-page:not(.content-page) .page-lead p + p { margin-top:14px; }
.docs-page:not(.content-page) .m h2 { margin-top:44px; }
@media(max-width:1000px) {
  .docs-hub .cards { grid-template-columns:repeat(2,minmax(0,1fr)); }
  .docs-hub .card, .docs-hub .card:nth-child(-n+2) { grid-column:auto; }
  .docs-hub .cards--core,
  .docs-hub .cards--sub { grid-template-columns:repeat(2,minmax(0,1fr)); }
  .docs-hub .card--featured { grid-template-columns:44px minmax(0,1fr); }
  .docs-hub .card--featured .card-arrow { display:none; }
}
@media(max-width:640px) {
  .docs-hub .hero { padding:96px 20px 28px; }
  .docs-hub .hero h1 { font-size:28px; }
  .docs-hub .hero p { font-size:16px; }
  .docs-hub .hero-meta { gap:10px 18px; }
  .docs-hub .cards { grid-template-columns:minmax(0,1fr); padding:0 20px 48px; gap:12px; }
  .docs-hub .doc-hub-group .cards { padding:0; }
  .docs-hub .card { padding:22px 18px; column-gap:14px; }
  .docs-hub .cards--core,
  .docs-hub .cards--sub { grid-template-columns:1fr; }
  .docs-hub .card--featured { grid-template-columns:1fr; padding:20px; }
  .docs-hub .card--featured .card-icon { display:none; }
  .docs-hub .doc-hub-group { margin-bottom:36px; }
  .docs-page:not(.content-page) .m > .page-lead { padding-bottom:22px; margin-bottom:26px; }
  .docs-page:not(.content-page) .page-lead .sub { font-size:17px; }
  .docs-page:not(.content-page) .m h2 { margin-top:36px; }
}

/* 总览在窄屏按原图的四个阶段展开，避免将图中文字等比缩小。 */
.usage-overview { padding:22px; }
.usage-overview .usage-flow { display:block; }
.usage-mobile, .usage-mobile-feedback { display:none; }
.doc-gallery-head h2 { scroll-margin-top:90px; }
.docs-page:not(.content-page) .page-lead .doc-version { font-size:14px; line-height:1.8; color:var(--text-muted); }
.doc-version-details { margin-top:14px; }
.doc-version-details summary { padding:8px 0; cursor:pointer; font-size:14px; font-weight:600; color:var(--blue-deep); }
.docs-page:not(.content-page) .page-lead .doc-version-details p { margin-top:8px; font-size:14px; line-height:1.8; }
.doc-shot--compact img { width:min(100%,568px); margin-inline:auto; }
.doc-version-details summary:focus-visible, .doc-toc-inline summary:focus-visible, .lang-trigger:focus-visible { outline:2px solid var(--text-primary); outline-offset:3px; }
@media(max-width:1100px) {
  .tn-burger, .topnav-burger { min-width:44px; min-height:44px; }
  .tn-burger span, .topnav-burger span { margin-inline:auto; }
  .tn-r, .topnav-links { max-height:calc(100vh - 80px); max-height:calc(100dvh - 80px); overflow-y:auto; overscroll-behavior:contain; }
}
@media(max-width:1100px) {
  .usage-overview .usage-flow { display:none; }
  .usage-overview .usage-mobile { display:block; list-style:none; padding:0; margin:0; }
  .usage-mobile > li { padding:18px 0; margin:0; border-top:1px solid var(--border); }
  .usage-mobile > li:first-child { padding-top:0; border-top:0; }
  .usage-mobile .usage-phase-title { display:block; font-size:16px; line-height:1.6; color:var(--text-primary); }
  .usage-mobile dt { margin-top:12px; font-size:15px; line-height:1.6; font-weight:600; color:var(--text-primary); }
  .usage-mobile dd { margin:4px 0 0; font-size:14px; line-height:1.8; color:var(--text-secondary); overflow-wrap:anywhere; }
  .usage-overview .usage-mobile-feedback { display:block; margin:0; padding-top:14px; border-top:1px solid var(--border); font-size:14px; line-height:1.8; color:var(--text-secondary); }
}
@media(min-width:641px) and (max-width:1100px) {
  .usage-mobile dl { display:grid; grid-template-columns:minmax(140px,.6fr) minmax(0,1.4fr); column-gap:24px; align-items:baseline; margin-top:8px; }
  .usage-mobile dt, .usage-mobile dd { margin:0; padding-block:8px; }
}

/* --------------------------------------------------------------------------
   Floating Back-to-Top Button (Unified Documentation & Portal Style)
   -------------------------------------------------------------------------- */
.back-to-top {
  position: fixed;
  bottom: 32px;
  inset-inline-end: 32px;
  z-index: 90;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid rgba(var(--accent-rgb, 95, 179, 234), 0.22);
  box-shadow: 0 4px 16px rgba(18, 50, 76, 0.08);
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease, background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, color 0.2s ease;
}

.back-to-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top:hover {
  background: #ffffff;
  border-color: var(--blue-deep);
  color: var(--blue-deep);
  box-shadow: 0 6px 20px rgba(var(--accent-rgb, 95, 179, 234), 0.2);
  transform: translateY(-2px);
}

[data-theme="dark"] .back-to-top {
  background: rgba(21, 30, 45, 0.85);
  border-color: rgba(95, 179, 234, 0.25);
  color: #e2e8f0;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .back-to-top:hover {
  background: rgba(30, 45, 65, 0.95);
  border-color: var(--blue);
  color: var(--blue-light);
}

@media (max-width: 640px) {
  .back-to-top {
    bottom: 24px;
    inset-inline-end: 20px;
    padding: 7px 12px;
    font-size: 12px;
  }
}