:root {
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --primary-soft: rgba(79, 70, 229, 0.1);
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --text: #0f172a;
  --text-muted: #475569;
  --text-faint: #94a3b8;
  --bg: #f8fafc;
  --bg-card: #ffffff;
  --bg-soft: #f1f5f9;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --code-bg: #0f172a;
  --code-fg: #e2e8f0;
  --code-comment: #94a3b8;
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-sm: 0 2px 6px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
  --radius: 0.75rem;
  --radius-sm: 0.5rem;
  --radius-pill: 999px;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Monaco, "Cascadia Code", monospace;
  --content-width: 1100px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

button {
  font: inherit;
  color: inherit;
}

img,
svg {
  display: block;
  max-width: 100%;
}

ul {
  list-style: none;
}

.app-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
  padding-bottom: 4rem;
}

.container {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
  width: 100%;
}

.top-nav {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: saturate(180%) blur(8px);
}

.top-nav__inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0.875rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.top-nav__brand {
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--primary);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.top-nav__links {
  display: flex;
  gap: 0.25rem;
  flex: 1;
  flex-wrap: wrap;
}
.top-nav__links .nav-link {
  text-decoration: none;
  color: var(--text-muted);
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.9375rem;
  transition: background-color 0.15s ease, color 0.15s ease;
}
.top-nav__links .nav-link:hover {
  background: var(--bg-soft);
  color: var(--text);
}
.top-nav__links .nav-link.active {
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 600;
}

.top-nav__source {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
}
.top-nav__source:hover {
  color: var(--primary);
}

.page-header {
  margin-bottom: 3rem;
}
.page-header h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}
.page-header p {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 60ch;
}

.page-section {
  margin-bottom: 3.5rem;
}
.page-section__title {
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 0.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}
.page-section__intro {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  max-width: 70ch;
}

.demo-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow-xs);
  transition: box-shadow 0.2s ease;
}
.demo-card:hover {
  box-shadow: var(--shadow-sm);
}
.demo-card__head {
  margin-bottom: 1.25rem;
}
.demo-card__title {
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: -0.005em;
  margin-bottom: 0.25rem;
}
.demo-card__desc {
  font-size: 0.9375rem;
  color: var(--text-muted);
}
.demo-card__body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
@media (max-width: 860px) {
  .demo-card__body {
    grid-template-columns: 1fr;
  }
}
.demo-card--wide .demo-card__body {
  grid-template-columns: 1fr;
}
.demo-card--wide .demo-card__preview {
  align-items: stretch;
}
.demo-card__preview {
  background: var(--bg-soft);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: flex-start;
  overflow: visible;
  min-height: 4rem;
}
.demo-card__code-wrap {
  position: relative;
}
.demo-card__code {
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 1.25rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.65;
  overflow-x: auto;
  margin: 0;
  white-space: pre;
  tab-size: 4;
}
.demo-card__code > code.hljs {
  background: transparent;
  padding: 0;
  display: block;
}
.demo-card__copy {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  z-index: 1;
  appearance: none;
  background: rgba(255, 255, 255, 0.08);
  color: var(--code-fg);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius-sm);
  padding: 0.25rem 0.625rem;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.demo-card__copy:hover {
  background: rgba(255, 255, 255, 0.16);
  color: #ffffff;
}
.demo-card__copy--success {
  background: rgba(16, 185, 129, 0.25);
  color: #6ee7b7;
  border-color: rgba(16, 185, 129, 0.4);
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}
.topic-grid li {
  margin: 0;
}
.topic-grid .nav-link {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  padding: 1.25rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}
.topic-grid .nav-link strong {
  font-size: 1.0625rem;
  color: var(--primary);
}
.topic-grid .nav-link span {
  font-size: 0.875rem;
  color: var(--text-muted);
}
.topic-grid .nav-link:hover {
  border-color: var(--primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.inline-row {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.lab-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.lab-row .nav-link {
  text-decoration: none;
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.9375rem;
}
.lab-row .nav-link:hover {
  color: var(--text);
  border-color: var(--border-strong);
}
.lab-row .nav-link.active {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.btn {
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 0.5rem 1rem;
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease, color 0.15s ease;
}
.btn:hover {
  border-color: var(--primary);
  background: var(--primary-soft);
  color: var(--primary);
}
.btn:active {
  transform: translateY(1px);
}

.status {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.625rem;
  border-radius: var(--radius-pill);
  font-size: 0.8125rem;
  font-weight: 600;
}
.status--active {
  background: rgba(16, 185, 129, 0.15);
  color: var(--success);
}
.status--idle {
  background: var(--bg-soft);
  color: var(--text-faint);
}

.status-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
}
.status-list li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9375rem;
}

.inline-code {
  background: var(--bg-soft);
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

.inline-pre {
  background: var(--bg-soft);
  padding: 0.875rem 1rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.5;
  overflow-x: auto;
  margin: 0;
  white-space: pre-wrap;
  width: 100%;
}

.muted {
  color: var(--text-muted);
}

.util-table-wrap {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.util-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}
.util-table th,
.util-table td {
  text-align: left;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
}
.util-table th {
  background: var(--bg-soft);
  font-weight: 600;
  font-size: 0.8125rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.util-table code {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text);
}

.trail {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  align-items: center;
  font-size: 0.9375rem;
}
.trail__sep {
  color: var(--text-faint);
}
.trail__current {
  color: var(--text);
  font-weight: 600;
}

.my-link {
  text-decoration: underline;
  color: var(--primary-dark);
}
.my-link.active {
  text-decoration: none;
  background: var(--primary-soft);
  color: var(--primary);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
}

.is-active {
  background: #00d1b2;
  color: #ffffff;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
}

.pill {
  background: var(--bg-soft);
  color: var(--text-muted);
  padding: 0.375rem 1rem;
  border-radius: var(--radius-pill);
  font-weight: 500;
  text-decoration: none;
}
.pill--current {
  background: var(--primary);
  color: #ffffff;
}

.nav-link {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}
.nav-link.active {
  font-weight: 700;
}

.nav-list {
  background: var(--bg-card);
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  width: 100%;
  max-width: 260px;
  list-style: none;
}

.nav-item {
  padding: 0.375rem 0.5rem;
  border-radius: var(--radius-sm);
  list-style: none;
}
.nav-item:hover {
  background: var(--bg-soft);
}

.nav-divider {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 0.5rem 0;
  list-style: none;
}

.nav-divider-vertical {
  border: 0;
  border-left: 1px solid var(--border);
  height: 1.25rem;
  margin: 0 0.5rem;
}

.nav-divider-text {
  font-size: 0.75rem;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.125rem 0.5rem;
}

.nav-header {
  list-style: none;
  padding: 0.375rem 0.5rem 0.125rem;
}

.nav-header-text {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-text {
  color: var(--text-muted);
  font-size: 0.875rem;
  padding: 0.25rem 0.5rem;
  list-style: none;
}

.nav-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1.4;
  background: var(--bg-soft);
  color: var(--text-muted);
}
.nav-badge-pill {
  border-radius: var(--radius-pill);
}
.nav-badge-primary {
  background: var(--primary-soft);
  color: var(--primary);
}
.nav-badge-success {
  background: rgba(16, 185, 129, 0.15);
  color: var(--success);
}
.nav-badge-warning {
  background: rgba(245, 158, 11, 0.18);
  color: #92400e;
}
.nav-badge-danger {
  background: rgba(239, 68, 68, 0.15);
  color: var(--danger);
}

.nav-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}
.nav-icon-sm {
  font-size: 0.875rem;
  width: 1rem;
  height: 1rem;
}
.nav-icon-md {
  font-size: 1.125rem;
  width: 1.25rem;
  height: 1.25rem;
}
.nav-icon-lg {
  font-size: 1.5rem;
  width: 1.75rem;
  height: 1.75rem;
}

.nav-link-with-icon {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-tabs {
  display: flex;
  gap: 0.25rem;
  border-bottom: 1px solid var(--border);
  margin: 0 0 1rem 0;
  padding: 0;
  width: 100%;
  flex-wrap: wrap;
  list-style: none;
}

.nav-tabs-fill > .nav-tab {
  flex: 1 1 0;
}

.nav-tab {
  list-style: none;
  margin-bottom: -1px;
}
.nav-tab > button {
  appearance: none;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  cursor: pointer;
  font: inherit;
  font-size: 0.9375rem;
  font-weight: 500;
  padding: 0.5rem 1rem;
  line-height: 1.3;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.nav-tab > button:hover:not(:disabled) {
  color: var(--text);
}
.nav-tab > button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.nav-tab.active > button {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.nav-tab-panel {
  width: 100%;
  padding: 0.5rem;
}
.nav-tab-panel[hidden] {
  display: none;
}

.nav-dropdown {
  position: relative;
  list-style: none;
}

.nav-dropdown-toggle {
  appearance: none;
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  color: var(--text);
  cursor: pointer;
  font: inherit;
  font-size: 0.9375rem;
  padding: 0.5rem 1rem;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}
.nav-dropdown-toggle:hover {
  border-color: var(--primary);
  background: var(--primary-soft);
}
.nav-dropdown-toggle[aria-expanded=true] {
  border-color: var(--primary);
  background: var(--primary-soft);
}

.nav-dropdown-caret {
  margin-left: 0.25rem;
  font-size: 0.6875rem;
  color: var(--text-muted);
}

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 0.25rem);
  left: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  min-width: 12rem;
  padding: 0.375rem;
  z-index: 50;
  list-style: none;
  margin: 0;
  display: none;
}
.nav-dropdown-menu.open {
  display: block;
}

.nav-dropdown-item {
  padding: 0.375rem 0.625rem;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  list-style: none;
}
.nav-dropdown-item a,
.nav-dropdown-item .nav-link {
  display: block;
  text-decoration: none;
  color: inherit;
}
.nav-dropdown-item:hover:not(.disabled) {
  background: var(--bg-soft);
}
.nav-dropdown-item.disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.nav-dropdown-divider {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 0.375rem 0;
  list-style: none;
}

.pagination {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  align-items: center;
  list-style: none;
  padding: 0;
  margin: 0;
}

.pagination-item {
  list-style: none;
}
.pagination-item > button, .pagination-item > a {
  appearance: none;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  font: inherit;
  font-size: 0.875rem;
  min-width: 2.25rem;
  padding: 0.375rem 0.75rem;
  text-align: center;
  text-decoration: none;
  transition: border-color 0.15s ease, color 0.15s ease, background-color 0.15s ease;
}
.pagination-item > button:hover:not([disabled]), .pagination-item > a:hover:not([disabled]) {
  border-color: var(--border-strong);
  color: var(--text);
}
.pagination-item > button[disabled], .pagination-item > a[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
}
.pagination-item.active > button, .pagination-item.active > a {
  background: var(--primary);
  border-color: var(--primary);
  color: #ffffff;
}

.page-link {
  color: var(--primary);
  text-decoration: none;
}
.page-link:hover {
  text-decoration: underline;
}

@media (max-width: 720px) {
  .container {
    padding: 1.5rem 1rem;
  }
  .demo-card {
    padding: 1rem;
  }
  .demo-card__preview {
    padding: 1rem;
  }
  .demo-card__code {
    padding: 1rem;
    font-size: 0.75rem;
  }
  .demo-card__copy {
    top: 0.375rem;
    right: 0.375rem;
    font-size: 0.6875rem;
    padding: 0.1875rem 0.5rem;
  }
  code,
  .inline-code {
    overflow-wrap: anywhere;
    word-break: break-word;
  }
  .util-table {
    min-width: 26rem;
  }
}
@media (max-width: 720px) {
  .top-nav__inner {
    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-areas: "brand source" "links links";
    row-gap: 0.5rem;
    padding: 0.625rem 1rem;
  }
  .top-nav__brand {
    grid-area: brand;
  }
  .top-nav__source {
    grid-area: source;
  }
  .top-nav__links {
    grid-area: links;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 0 -0.25rem;
    padding: 0 0.25rem;
    scrollbar-width: thin;
  }
  .top-nav__links .nav-link {
    white-space: nowrap;
    font-size: 0.875rem;
    padding: 0.375rem 0.75rem;
  }
}
.skip-link {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 200;
  padding: 0.75rem 1rem;
  background: var(--primary);
  color: #ffffff;
  font-weight: 600;
  text-decoration: none;
  border-radius: 0 0 var(--radius-sm) 0;
  transform: translateY(-100%);
  transition: transform 0.15s ease-out;
}
.skip-link:focus, .skip-link:focus-visible {
  transform: translateY(0);
  outline: 2px solid var(--primary-dark);
  outline-offset: 2px;
}

:focus {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

main:focus,
main:focus-visible {
  outline: none;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}
@media (prefers-color-scheme: dark) {
  :root {
    --primary: #818cf8;
    --primary-dark: #a5b4fc;
    --primary-soft: rgba(129, 140, 248, 0.18);
    --success: #34d399;
    --warning: #fbbf24;
    --danger: #f87171;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --text-faint: #64748b;
    --bg: #020617;
    --bg-card: #0f172a;
    --bg-soft: #1e293b;
    --border: #1e293b;
    --border-strong: #334155;
    --code-bg: #020617;
    --code-fg: #cbd5e1;
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.55);
  }
  .nav-badge-warning {
    color: #fde68a;
    background: rgba(251, 191, 36, 0.18);
  }
  .is-active {
    background: #14b8a6;
  }
}