:root {
  --blue: #6a9fc1;
  --blue-light: #96bdd6;
  --blue-pale: #ebf3f8;
  --blue-deep: #2e6588;
  --accent-rgb: 106, 159, 193;
  --accent-light-rgb: 212, 229, 240;
  --ink-rgb: 23, 38, 53;
  --bg: #fcfdfd;
  --bg-subtle: #f4f7fa;
  --bg-card: rgba(255, 255, 255, 0.96);
  --bg-card-hover: rgba(255, 255, 255, 1);
  --reading-width: 820px;
  --reading-width-wide: 960px;
  --text-primary: #172635;
  --text-secondary: #506577;
  --text-muted: #5a7287;
  --border: rgba(var(--accent-rgb), 0.14);
  --border-strong: rgba(var(--accent-rgb), 0.22);
  --border-soft: rgba(var(--accent-rgb), 0.09);
  --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 32px;
  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);
}

.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;
}

.tn .tn-r a.nav-cta,
.topnav-links a.nav-cta {
  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;
}

.sb {
  position: fixed;
  top: 64px;
  left: 0;
  bottom: 0;
  width: 240px;
  padding: 24px 16px;
  overflow-y: auto;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-right: 1px solid var(--border);
}

.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: block;
  margin-bottom: 6px;
  padding: 11px 14px;
  border-radius: 14px;
  border: 1px solid transparent;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
}

.sb a:hover {
  color: var(--text-primary);
  background: rgba(var(--accent-light-rgb), 0.22);
  border-color: var(--border);
}

.sb a.on {
  color: var(--blue-deep);
  background: rgba(var(--accent-light-rgb), 0.3);
  border-color: rgba(var(--accent-rgb), 0.22);
  font-weight: 600;
}

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

.docs-page .m {
  background: transparent;
  box-shadow: none;
}

.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;
  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;
  font-weight: 700;
  color: var(--text-primary);
}

.m h3 {
  margin-top: 32px;
  margin-bottom: 12px;
  font-size: 22px;
  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);
}

.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: 12px;
  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: 64 / 41;
  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);
}

.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: 1120px;
  margin: 0 auto 84px;
  padding: 0 36px;
}

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

.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: 760px;
  margin: 0 auto;
  padding-bottom: 28px;
}

.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: 32px 24px 24px;
  border-top: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.94);
}

.footer a {
  text-decoration: none;
}

.footer-main {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
}

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

.footer-logo {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
}

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

.footer-tagline {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-secondary);
}

.footer-columns {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(3, minmax(140px, 1fr));
  gap: 28px;
}

.footer-col-title {
  margin-bottom: 12px;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.footer-col a {
  display: block;
  padding: 4px 0;
  font-size: 14px;
  color: var(--text-secondary);
  transition: color 0.2s;
}

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

.footer-bottom {
  max-width: 1080px;
  margin: 24px auto 0;
  padding-top: 16px;
  border-top: 1px solid var(--border-soft);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

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

.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;
}

.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;
    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: 768px) {
  .sb {
    display: none;
  }

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

  .mobile-doc-nav {
    display:flex;
    flex-wrap:wrap;
    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 {
    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: 10px;
    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 {
    width: 100%;
    grid-template-columns: repeat(2, minmax(140px, 1fr));
    gap: 24px;
  }

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


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

/* ===== 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;
  right: 12px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  opacity: 0.6;
}

/* 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"] .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);
}

[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), 0.05) 0%, rgba(var(--accent-rgb), 0) 60%) no-repeat,
    linear-gradient(180deg, var(--bg-subtle) 0%, var(--bg) 240px, #ffffff 620px) no-repeat;
  background-color: #ffffff;
}
[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; }
.code-copy {
  position: absolute;
  top: 8px;
  right: 10px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 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: 11px;
  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); }
@media (hover: none) { .code-copy { opacity: 0.85; 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; }
@media (min-width: 1440px) {
  .docs-page .m > :where(pre, table, .page-lead, .doc-shot, .doc-gallery) {
    max-width: var(--reading-width);
  }
  .docs-page .m > .doc-gallery {
    margin-left: 0;
    margin-right: 0;
    padding-left: 0;
    padding-right: 0;
  }
  .docs-page .doc-toc {
    display: block;
    position: fixed;
    top: 96px;
    left: 1184px;
    width: 206px;
    max-height: calc(100vh - 140px);
    padding: 4px 4px 4px 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 */
    padding: 4px 16px;
  }
}
.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-left: 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 ---- */
.sb a { position: relative; }
.sb a.on::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 17px;
  border-radius: 3px;
  background: var(--blue);
}
[dir="rtl"] .sb a.on::before { left: auto; right: 5px; }

/* ---- 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) {
  /* sidebar + content sit at fixed PHYSICAL positions in every locale (CSS uses
     physical left), so the footer offset is the same physical margin for ug too. */
  .sb ~ .footer { margin-left: 240px; }
  .sb ~ .footer .footer-main,
  .sb ~ .footer .footer-bottom {
    max-width: var(--reading-width);
    margin-left: 64px;
    margin-right: auto;
  }
}

@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));
  }
}


/* =====================================================================
   TOP-LEVEL CONTENT PAGE SYSTEM
   Shared geometry for About, Changelog, Privacy, Terms, and service notes.
   ===================================================================== */
.content-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.content-page .content-main {
  width: min(100%, 1120px);
  max-width: none;
  margin: 0 auto;
  padding: 120px 24px 112px;
  flex: 1 0 auto;
}

.content-page .content-main > :where(h2, h3, p, ul, ol, hr, pre, table, .tip) {
  width: 100%;
  max-width: 820px;
  margin-left: auto;
  margin-right: auto;
}

.content-page .page-lead {
  max-width: 960px;
  margin: 0 auto 56px;
  padding: 42px 44px 44px;
  border: 1px solid rgba(var(--accent-rgb), 0.14);
  border-radius: 28px;
  background:
    radial-gradient(circle at 92% 4%, rgba(var(--accent-rgb), 0.1), transparent 36%),
    linear-gradient(145deg, rgba(255, 255, 255, 0.98), rgba(248, 252, 255, 0.92));
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.92) inset,
    0 22px 56px rgba(var(--ink-rgb), 0.065),
    0 8px 22px rgba(var(--accent-rgb), 0.055);
}

.content-page .page-lead::before {
  content: "";
  position: absolute;
  top: 0;
  left: 44px;
  width: 48px;
  height: 3px;
  border-radius: 0 0 999px 999px;
  background: linear-gradient(90deg, var(--blue-deep), var(--blue-light));
}

.content-page .page-lead h1 {
  max-width: 800px;
  margin-bottom: 12px;
  font-size: clamp(38px, 3.8vw, 48px);
  line-height: 1.14;
  letter-spacing: -0.035em;
  text-wrap: balance;
}

.content-page .page-lead .sub {
  max-width: 740px;
  margin-bottom: 0;
  font-size: 18px;
  line-height: 1.75;
  text-wrap: pretty;
}

.content-page .content-main > h2 {
  margin-top: 52px;
  margin-bottom: 18px;
  padding-bottom: 13px;
  border-bottom-color: rgba(var(--accent-rgb), 0.13);
  font-size: 25px;
  line-height: 1.35;
  letter-spacing: -0.018em;
  text-wrap: balance;
}

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

.content-page .content-main p,
.content-page .content-main li {
  font-size: 16.5px;
  line-height: 1.9;
}

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

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

.content-page .tip {
  margin-top: 0;
  margin-bottom: 42px;
  padding: 18px 20px;
  border-left-width: 3px;
  border-radius: 15px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 12px 30px rgba(var(--accent-rgb), 0.045);
}

.content-page table {
  margin-top: 22px;
  margin-bottom: 30px;
  border-radius: 20px;
  box-shadow: 0 18px 42px rgba(var(--ink-rgb), 0.055);
  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: turn short inventories into compact information panels. */
.about-page .content-main > ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  padding-left: 0;
  list-style: none;
}

.about-page .content-main > ul li {
  margin: 0;
  padding: 13px 15px;
  border: 1px solid rgba(var(--accent-rgb), 0.12);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.7);
}

[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;
  }
}