:root {
  --help-accent: #e8791d;
  --help-accent-deep: color-mix(in srgb, var(--help-accent) 80%, #000);
  --help-accent-light: color-mix(in srgb, var(--help-accent) 22%, #fff);

  --help-bg: #f5f5f7;
  --help-bg-secondary: #eeeef0;
  --help-card-bg: #ffffff;
  --help-sidebar-bg: #ffffff;
  --help-header-bg: rgba(245,245,247,0.75);
  --help-search-bg: #ffffff;
  --help-toc-bg: rgba(245,245,247,0.75);

  --help-text: #0d0d0d;
  --help-text-body: #333333;
  --help-text-muted: #666666;
  --help-text-tertiary: #6e6e6e;

  --help-border: rgba(0,0,0,0.05);
  --help-border-strong: rgba(0,0,0,0.08);

  --help-code-bg: #f5f5f5;
  --help-code-text: #0d0d0d;
  --help-kbd-bg: #f5f5f5;
  --help-kbd-border: rgba(0,0,0,0.08);

  --help-shadow-card: 0 2px 4px rgba(0,0,0,0.03);
  --help-shadow-button: 0 1px 2px rgba(0,0,0,0.06);
  --help-shadow-pop: 0 8px 24px rgba(0,0,0,0.06);

  --help-sidebar-w: 280px;
  --help-header-h: 56px;

  --help-radius-sm: 4px;
  --help-radius-md: 8px;
  --help-radius-lg: 16px;
  --help-radius-xl: 24px;
  --help-radius-pill: 9999px;

  --help-font-sans: 'Geist', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --help-font-mono: 'Geist Mono', ui-monospace, SFMono-Regular, 'JetBrains Mono', Menlo, monospace;

  --help-scrollbar: color-mix(in srgb, var(--help-accent) 6%, #e5e5e5);
  --help-scrollbar-hover: color-mix(in srgb, var(--help-accent) 35%, #888);
}

[data-theme="dark"] {
  --help-accent-deep: var(--help-accent);
  --help-accent-light: color-mix(in srgb, var(--help-accent) 14%, transparent);

  --help-bg: #1c1c1e;
  --help-bg-secondary: #242426;
  --help-card-bg: #2c2c2e;
  --help-sidebar-bg: #2c2c2e;
  --help-header-bg: rgba(28,28,30,0.75);
  --help-search-bg: #3a3a3c;
  --help-toc-bg: rgba(28,28,30,0.75);

  --help-text: #ededed;
  --help-text-body: #d4d4d4;
  --help-text-muted: #a0a0a0;
  --help-text-tertiary: #9a9a9a;

  --help-border: rgba(255,255,255,0.08);
  --help-border-strong: rgba(255,255,255,0.12);

  --help-code-bg: #141414;
  --help-code-text: #ededed;
  --help-kbd-bg: #141414;
  --help-kbd-border: rgba(255,255,255,0.12);

  --help-shadow-card: 0 2px 4px rgba(0,0,0,0.4);
  --help-shadow-button: 0 1px 2px rgba(0,0,0,0.6);
  --help-shadow-pop: 0 8px 24px rgba(0,0,0,0.5);

  --help-scrollbar: color-mix(in srgb, var(--help-accent) 10%, #2a2a2a);
  --help-scrollbar-hover: color-mix(in srgb, var(--help-accent) 35%, #4a4a4a);
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--help-font-sans);
  font-size: 16px;
  font-weight: 400;
  background: var(--help-bg);
  color: var(--help-text-body);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  padding-top: var(--help-header-h);
  padding-left: calc(var(--help-sidebar-w) + 24px);
  transition: background 0.2s, color 0.2s;
}

::selection {
  background: var(--help-accent-light);
  color: var(--help-accent-deep);
}

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--help-scrollbar); border-radius: var(--help-radius-pill); }
::-webkit-scrollbar-thumb:hover { background: var(--help-scrollbar-hover); }

.help-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 12px;
  height: var(--help-header-h);
  padding: 0 24px;
  padding-left: calc(var(--help-sidebar-w) + 40px);
  padding-right: max(24px, env(safe-area-inset-right));
  background: var(--help-header-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
}

.help-sidebar-header {
  padding: 4px 12px 20px;
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.help-logo {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  color: var(--help-accent);
}

.help-title {
  font-family: var(--help-font-sans);
  font-weight: 600;
  font-size: 16px;
  letter-spacing: -0.2px;
  color: var(--help-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

.help-header-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

.help-sidebar-toggle,
.help-theme-toggle {
  display: none;
  background: transparent;
  border: 1px solid transparent;
  color: var(--help-text);
  cursor: pointer;
  padding: 0;
  min-width: 44px;
  min-height: 44px;
  border-radius: var(--help-radius-md);
  align-items: center;
  justify-content: center;
  transition: background 0.15s, border-color 0.15s;
}

.help-theme-toggle { display: flex; }

.help-sidebar-toggle:hover,
.help-theme-toggle:hover {
  background: var(--help-bg-secondary);
  border-color: var(--help-border);
}

.help-sidebar-toggle:focus-visible,
.help-theme-toggle:focus-visible {
  outline: 2px solid var(--help-accent);
  outline-offset: 2px;
}

[data-theme="dark"] .icon-sun { display: inline; }
[data-theme="dark"] .icon-moon { display: none; }
:root:not([data-theme="dark"]) .icon-sun { display: none; }
:root:not([data-theme="dark"]) .icon-moon { display: inline; }

.help-search-wrapper {
  position: relative;
}

.help-search {
  width: 260px;
  padding: 8px 16px;
  border: 1px solid var(--help-border-strong);
  border-radius: var(--help-radius-pill);
  background: var(--help-search-bg);
  color: var(--help-text);
  font-family: var(--help-font-sans);
  font-size: 14px;
  font-weight: 400;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.help-search::placeholder { color: var(--help-text-tertiary); }

.help-search:focus:not(:focus-visible) { outline: none; }

.help-search:focus {
  border-color: var(--help-accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--help-accent) 15%, transparent);
}

.help-search:focus-visible {
  outline: 2px solid var(--help-accent);
  outline-offset: 2px;
}

.help-search-results {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 360px;
  max-height: 420px;
  overflow-y: auto;
  background: var(--help-bg);
  border: 1px solid var(--help-border);
  border-radius: var(--help-radius-lg);
  box-shadow: var(--help-shadow-pop);
  z-index: 200;
  padding: 4px;
}

.help-search-results.active { display: block; }

.help-search-result {
  display: block;
  padding: 12px 14px;
  text-decoration: none;
  color: var(--help-text);
  border-radius: var(--help-radius-md);
  cursor: pointer;
  transition: background 0.1s;
}

.help-search-result + .help-search-result { margin-top: 2px; }
.help-search-result:hover { background: var(--help-bg-secondary); }

.help-search-result:focus-visible {
  outline: 2px solid var(--help-accent);
  outline-offset: -2px;
}

.help-search-result-title {
  font-weight: 500;
  font-size: 14px;
  margin-bottom: 2px;
  color: var(--help-text);
}

.help-search-result-snippet {
  font-size: 13px;
  color: var(--help-text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.help-search-result-snippet mark {
  background: var(--help-accent-light);
  color: var(--help-accent-deep);
  border-radius: var(--help-radius-sm);
  padding: 0 2px;
}

.help-search-empty {
  padding: 16px;
  text-align: center;
  color: var(--help-text-muted);
  font-size: 14px;
}

.help-layout {
  display: block;
  min-height: calc(100dvh - var(--help-header-h));
}

.help-sidebar {
  position: fixed;
  top: 12px;
  left: 12px;
  width: var(--help-sidebar-w);
  height: calc(100dvh - 24px);
  background: var(--help-sidebar-bg);
  border-radius: var(--help-radius-lg);
  padding: 16px 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: var(--help-shadow-card);
  z-index: 200;
  transition: background 0.2s;
}

.help-nav {
  list-style: none;
  flex: 1;
  overflow-y: auto;
  padding: 0 12px;
  min-height: 0;
}

.help-sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 105;
  backdrop-filter: blur(2px);
}

.help-nav li { position: relative; }

.help-nav-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  min-height: 36px;
  margin: 2px 0;
  color: var(--help-text-body);
  text-decoration: none;
  font-family: var(--help-font-sans);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.1s, color 0.1s;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  border-radius: var(--help-radius-md);
}

.help-nav-item:hover {
  background: var(--help-bg-secondary);
  color: var(--help-text);
}

.help-nav-item:focus-visible {
  outline: 2px solid var(--help-accent);
  outline-offset: -2px;
}

.help-nav-item.active {
  color: var(--help-accent-deep);
  font-weight: 600;
  background: var(--help-accent-light);
}

.help-nav-group-toggle { font-weight: 600; }

.help-nav-group-toggle .chevron {
  transition: transform 0.15s;
  flex-shrink: 0;
  opacity: 0.6;
}

.help-nav-group-toggle.expanded .chevron {
  transform: rotate(90deg);
  opacity: 1;
}

.help-nav-children {
  list-style: none;
  display: none;
  padding-left: 16px;
  margin-top: 2px;
  border-left: 1px solid var(--help-border);
  margin-left: 12px;
}

.help-nav-children.expanded { display: block; }

.help-content {
  min-width: 0;
  max-width: clamp(calc(72ch + 64px), 62vw, calc(84ch + 64px));
  padding: 32px 56px 72px 16px;
  outline: none;
}

.help-toc-bar {
  display: none;
  flex: 1;
  min-width: 0;
  justify-content: safe center;
  align-items: center;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  white-space: nowrap;
}

.help-toc-bar::-webkit-scrollbar { display: none; }

.help-toc-bar.active { display: flex; }

.help-toc-bar-inner {
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
  gap: 4px;
}

.help-toc-bar a {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  min-height: 36px;
  color: var(--help-text-muted);
  text-decoration: none;
  font-family: var(--help-font-sans);
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
  transition: color 0.15s, background 0.15s;
  flex-shrink: 0;
  border-radius: var(--help-radius-md);
}

.help-toc-bar a:hover {
  color: var(--help-text);
  background: var(--help-bg-secondary);
}

.help-toc-bar a:focus-visible {
  outline: 2px solid var(--help-accent);
  outline-offset: -2px;
}

.help-toc-bar a.active {
  color: var(--help-accent-deep);
  background: var(--help-accent-light);
}

.help-toc-bar .toc-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--help-border-strong);
  flex-shrink: 0;
  transition: background 0.15s;
}

.help-toc-bar a.active .toc-dot { background: var(--help-accent); }

.help-toc-mobile {
  display: none;
  margin: 8px 0 24px;
  padding: 12px 16px;
  background: var(--help-bg-secondary);
  border-radius: var(--help-radius-lg);
  font-family: var(--help-font-sans);
  font-size: 14px;
}

.help-toc-mobile[hidden] { display: none; }

.help-toc-mobile summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--help-text);
  list-style: none;
  padding: 4px 0;
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 32px;
}

.help-toc-mobile summary::-webkit-details-marker { display: none; }

.help-toc-mobile summary::after {
  content: '';
  width: 8px;
  height: 8px;
  border-right: 1.5px solid var(--help-text-muted);
  border-bottom: 1.5px solid var(--help-text-muted);
  transform: rotate(45deg);
  margin-left: auto;
  margin-right: 4px;
  transition: transform 0.15s;
}

.help-toc-mobile[open] summary::after { transform: rotate(-135deg); margin-top: 4px; }

.help-toc-mobile-list {
  list-style: decimal inside;
  margin: 12px 0 4px;
  padding: 0;
  color: var(--help-text-muted);
}

.help-toc-mobile-list li { margin: 6px 0; padding-left: 4px; }

.help-toc-mobile-list a {
  color: var(--help-text-body);
  text-decoration: none;
  min-height: 32px;
  display: inline-flex;
  align-items: center;
}

.help-toc-mobile-list a:hover { color: var(--help-accent); }

.help-article {
  font-family: var(--help-font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.65;
  color: var(--help-text-body);
}

.help-article h1,
.help-article h2,
.help-article h3,
.help-article h4,
.help-article h5,
.help-article h6 {
  color: var(--help-text);
  font-family: var(--help-font-sans);
  scroll-margin-top: calc(var(--help-header-h) + 16px);
}

.help-article h1 {
  font-size: 44px;
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.9px;
  margin-bottom: 28px;
}

.help-article h2 {
  font-size: 26px;
  font-weight: 600;
  line-height: 1.28;
  letter-spacing: -0.26px;
  margin-top: 64px;
  margin-bottom: 16px;
}

.help-article h3 {
  font-size: 20px;
  font-weight: 600;
  line-height: 1.32;
  letter-spacing: -0.2px;
  margin-top: 40px;
  margin-bottom: 8px;
}

.help-article h4 {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.45;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--help-text-muted);
  margin-top: 32px;
  margin-bottom: 6px;
}

.help-article p {
  margin-bottom: 16px;
}

.help-article strong { font-weight: 600; color: var(--help-text); }
.help-article em { font-style: italic; }

.help-article a {
  color: var(--help-text);
  text-decoration: underline;
  text-decoration-color: var(--help-border-strong);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: color 0.15s, text-decoration-color 0.15s;
}

.help-article a:hover {
  color: var(--help-accent-deep);
  text-decoration-color: var(--help-accent);
}

.help-article ul,
.help-article ol {
  margin-bottom: 16px;
  padding-left: 24px;
}

.help-article li { margin-bottom: 8px; }
.help-article li::marker { color: var(--help-accent); }
.help-article li > ul,
.help-article li > ol { margin-top: 8px; margin-bottom: 0; }

.help-article blockquote {
  margin: 24px 0;
  padding: 16px 24px;
  background: var(--help-bg-secondary);
  border-radius: var(--help-radius-lg);
  color: var(--help-text-muted);
  font-style: italic;
}

.help-article blockquote p:last-child { margin-bottom: 0; }

.help-article img {
  max-width: 100%;
  border: 1px solid var(--help-border);
  border-radius: var(--help-radius-lg);
  margin: 16px 0;
}

.help-article hr {
  border: none;
  height: 0;
  margin: 48px 0;
}

.help-article code {
  font-family: var(--help-font-mono);
  font-size: 0.875em;
  font-weight: 500;
  background: var(--help-bg-secondary);
  color: var(--help-text);
  padding: 2px 6px;
  border-radius: var(--help-radius-sm);
  border: 1px solid var(--help-border);
}

.help-article pre {
  position: relative;
  margin: 24px 0;
  border-radius: var(--help-radius-lg);
  border: 1px solid var(--help-border);
  background: var(--help-code-bg);
  overflow: hidden;
}

.help-article pre code {
  display: block;
  padding: 20px 24px;
  background: transparent;
  border: none;
  border-radius: 0;
  color: var(--help-code-text);
  overflow-x: auto;
  font-family: var(--help-font-mono);
  font-size: 13px;
  font-weight: 400;
  line-height: 1.65;
}

.help-copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--help-bg);
  border: 1px solid var(--help-border-strong);
  color: var(--help-text-muted);
  padding: 6px 14px;
  min-height: 32px;
  border-radius: var(--help-radius-pill);
  font-family: var(--help-font-mono);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  cursor: pointer;
  opacity: 0.85;
  transition: opacity 0.15s, background 0.15s, color 0.15s, border-color 0.15s;
}

.help-copy-btn:hover {
  opacity: 1;
  background: var(--help-text);
  color: var(--help-bg);
  border-color: var(--help-text);
}

.help-copy-btn:focus-visible {
  outline: 2px solid var(--help-accent);
  outline-offset: 2px;
  opacity: 1;
}

.help-article table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 24px 0;
  font-size: 14px;
  border: 1px solid var(--help-border);
  border-radius: var(--help-radius-lg);
  overflow: hidden;
}

.help-article th,
.help-article td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--help-border);
}

.help-article tr:last-child td { border-bottom: none; }

.help-article th {
  background: var(--help-bg-secondary);
  font-weight: 600;
  color: var(--help-text);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.help-article kbd {
  display: inline-block;
  padding: 2px 8px;
  font-family: var(--help-font-mono);
  font-size: 0.85em;
  font-weight: 500;
  background: var(--help-kbd-bg);
  color: var(--help-text);
  border: 1px solid var(--help-kbd-border);
  border-radius: var(--help-radius-sm);
  box-shadow: 0 1px 0 var(--help-kbd-border);
}

.help-footer {
  margin-top: 64px;
  padding: 24px 0;
  text-align: center;
  font-family: var(--help-font-mono);
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--help-text-tertiary);
}

.help-footer a {
  color: var(--help-text-muted);
  text-decoration: none;
  transition: color 0.15s;
}

.help-footer a:hover { color: var(--help-accent-deep); }

.help-prev-next {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 48px;
}

.help-prev-next a {
  display: block;
  padding: 16px 20px;
  text-decoration: none;
  color: var(--help-text);
  background: var(--help-bg);
  border: 1px solid var(--help-border);
  border-radius: var(--help-radius-lg);
  font-family: var(--help-font-sans);
  font-size: 15px;
  font-weight: 500;
  transition: border-color 0.15s, background 0.15s;
  max-width: 50%;
  box-shadow: var(--help-shadow-card);
}

.help-prev-next a:hover {
  border-color: var(--help-border-strong);
  background: var(--help-bg-secondary);
}

.help-prev-next a:focus-visible {
  outline: 2px solid var(--help-accent);
  outline-offset: 2px;
}

.help-prev-next .prev-label,
.help-prev-next .next-label {
  display: block;
  font-family: var(--help-font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--help-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  margin-bottom: 4px;
}

.help-prev-next .next { margin-left: auto; text-align: right; }

@media (max-width: 768px) {
  body { padding-left: 0; }

  .help-header {
    padding-left: max(16px, env(safe-area-inset-left));
  }

  .help-sidebar-toggle { display: flex; }

  .help-toc-bar { display: none !important; }
  .help-toc-mobile:not([hidden]) { display: block; }

  .help-sidebar {
    left: 0;
    top: 0;
    height: 100dvh;
    padding-top: max(16px, env(safe-area-inset-top));
    padding-bottom: max(16px, env(safe-area-inset-bottom));
    border-radius: 0;
    z-index: 110;
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    box-shadow: 4px 0 16px rgba(0,0,0,0.08);
  }

  .help-sidebar.open { transform: translateX(0); }
  .help-sidebar.open ~ .help-sidebar-overlay,
  body:has(.help-sidebar.open) .help-sidebar-overlay { display: block; }

  .help-content { padding: 24px 20px 64px; max-width: 100%; }

  .help-nav-item { min-height: 44px; padding: 10px 12px; }
  .help-copy-btn { min-height: 44px; padding: 10px 16px; }

  .help-search { width: 200px; }

  .help-search-results {
    width: 320px;
    max-width: calc(100vw - 32px);
    right: 16px;
  }

  .help-article h1 { font-size: 34px; letter-spacing: -0.7px; margin-bottom: 24px; }
  .help-article h2 { font-size: 22px; letter-spacing: -0.22px; margin-top: 48px; }
  .help-article h3 { font-size: 18px; margin-top: 32px; }

  .help-prev-next { flex-direction: column; }
  .help-prev-next a { max-width: 100%; }
}

@media (max-width: 480px) {
  .help-header {
    padding: 0 16px;
    padding-left: max(16px, env(safe-area-inset-left));
    padding-right: max(16px, env(safe-area-inset-right));
    gap: 8px;
  }
  .help-content { padding: 24px 16px; }
  .help-search { width: 148px; padding: 8px 12px; }
  .help-article h1 { font-size: 28px; letter-spacing: -0.4px; }
}

.help-skip-link {
  position: fixed;
  top: -48px;
  left: 12px;
  padding: 10px 16px;
  background: var(--help-text);
  color: var(--help-bg);
  text-decoration: none;
  font-family: var(--help-font-sans);
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--help-radius-pill);
  z-index: 1000;
  transition: top 0.2s;
  box-shadow: var(--help-shadow-button);
}

.help-skip-link:focus { top: 12px; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* opaque fallback when backdrop-filter unsupported, else header/overlay become transparent */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .help-header { background: var(--help-bg); }
  .help-sidebar-overlay { background: rgba(0,0,0,0.6); }
}

@media print {
  body { padding: 0; }
  .help-header, .help-sidebar, .help-sidebar-overlay, .help-skip-link { display: none !important; }
  .help-content { padding: 0; max-width: none; }
  .help-copy-btn { display: none; }
}