:root {
   --bg: #ffffff;
   --bg-alt: #f6f7f9;
   --text: #1a1d23;
   --text-muted: #5b6270;
   --border: #e3e6ea;
   --accent: #4f46e5;
   --accent-ink: #ffffff;
   --code-bg: #f1f2f6;
   --warn-bg: #fff8e6;
   --warn-border: #f0c96b;
   --note-bg: #eef2ff;
   --note-border: #c7d2fe;
   --danger-bg: #fdecec;
   --danger-border: #f3b4b4;
   --sidebar-width: 260px;
   --max-width: 860px;
}

* {
   box-sizing: border-box;
}

html,
body {
   margin: 0;
   padding: 0;
}

body {
   font-family:
      -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial,
      sans-serif;
   color: var(--text);
   background: var(--bg);
   line-height: 1.6;
   font-size: 16px;
}

a {
   color: var(--accent);
   text-decoration: none;
}

a:hover {
   text-decoration: underline;
}

.layout {
   display: flex;
   min-height: 100vh;
}

/* --- Sidebar --- */

.sidebar {
   width: var(--sidebar-width);
   flex-shrink: 0;
   background: var(--bg-alt);
   border-right: 1px solid var(--border);
   padding: 16px 20px;
   position: sticky;
   top: 0;
   height: 100vh;
   overflow-y: auto;
}

.sidebar .brand {
   display: flex;
   align-items: center;
   font-size: 1.25rem;
   font-weight: 700;
   color: var(--text);
   margin-bottom: 4px;
}

.sidebar .brand img {
   width: 24px;
   height: 24px;
   margin-right: 8px;
}

.sidebar .brand span {
   color: var(--accent);
}

.sidebar .tagline {
   font-size: 0.78rem;
   color: var(--text-muted);
   margin-bottom: 20px;
}

#search-input {
   width: 100%;
   padding: 8px 10px;
   border: 1px solid var(--border);
   border-radius: 6px;
   font-size: 0.85rem;
   margin-bottom: 8px;
   background: var(--bg);
   color: var(--text);
}

#search-results {
   margin-bottom: 18px;
}

#search-results:empty {
   display: none;
}

#search-results a {
   display: block;
   padding: 6px 8px;
   border-radius: 6px;
   font-size: 0.85rem;
   color: var(--text);
}

#search-results a:hover {
   background: var(--border);
   text-decoration: none;
}

#search-results .snippet {
   display: block;
   color: var(--text-muted);
   font-size: 0.75rem;
}

.sidebar nav ul {
   list-style: none;
   margin: 0 0 18px;
   padding: 0;
}

.sidebar nav .group-title {
   font-size: 0.72rem;
   text-transform: uppercase;
   letter-spacing: 0.04em;
   color: var(--text-muted);
   margin: 18px 0 6px;
   font-weight: 600;
}

.sidebar nav a {
   display: block;
   padding: 6px 12px;
   border-radius: 6px;
   color: var(--text);
   font-size: 0.9rem;
}

.sidebar nav a:hover {
   background: var(--border);
   text-decoration: none;
}

.sidebar nav a.active {
   background: var(--accent);
   color: var(--accent-ink);
   font-weight: 600;
}

/* --- Content --- */

.content {
   flex: 1;
   padding: 40px 32px 80px;
   max-width: var(--max-width);
}

.content h1 {
   margin-top: 0;
   font-size: 1.9rem;
}

.content h2 {
   margin-top: 2.2em;
   font-size: 1.35rem;
   border-bottom: 1px solid var(--border);
   padding-bottom: 0.3em;
}

.content h3 {
   font-size: 1.1rem;
   margin-top: 1.6em;
}

.content p,
.content li {
   color: var(--text);
}

.content ul,
.content ol {
   padding-left: 1.4em;
}

code {
   font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
   background: var(--code-bg);
   padding: 0.15em 0.4em;
   border-radius: 4px;
   font-size: 0.88em;
}

pre {
   background: var(--code-bg);
   padding: 14px 16px;
   border-radius: 8px;
   overflow-x: auto;
}

pre code {
   background: none;
   padding: 0;
}

table {
   border-collapse: collapse;
   width: 100%;
   margin: 1em 0;
   font-size: 0.92rem;
}

th,
td {
   border: 1px solid var(--border);
   padding: 8px 10px;
   text-align: left;
}

th {
   background: var(--bg-alt);
}

.callout {
   border-left: 4px solid var(--note-border);
   background: var(--note-bg);
   padding: 12px 16px;
   border-radius: 6px;
   margin: 1.2em 0;
}

.callout.warn {
   border-left-color: var(--warn-border);
   background: var(--warn-bg);
}

.callout.danger {
   border-left-color: var(--danger-border);
   background: var(--danger-bg);
}

.callout p:first-child {
   margin-top: 0;
}

.callout p:last-child {
   margin-bottom: 0;
}

.screenshot-placeholder {
   border: 2px dashed var(--border);
   border-radius: 8px;
   padding: 28px 20px;
   text-align: center;
   color: var(--text-muted);
   font-size: 0.85rem;
   margin: 1.2em 0;
   background: var(--bg-alt);
}

.screenshot-placeholder strong {
   display: block;
   color: var(--text);
   margin-bottom: 4px;
}

.page-nav {
   display: flex;
   justify-content: space-between;
   margin-top: 3em;
   padding-top: 1.2em;
   border-top: 1px solid var(--border);
   font-size: 0.9rem;
}

.badge {
   display: inline-block;
   font-size: 0.72rem;
   font-weight: 600;
   padding: 2px 8px;
   border-radius: 999px;
   background: var(--note-bg);
   color: var(--accent);
   margin-left: 6px;
   vertical-align: middle;
}

.card-grid {
   display: grid;
   grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
   gap: 14px;
   margin: 1.4em 0;
}

.card {
   border: 1px solid var(--border);
   border-radius: 10px;
   padding: 16px 18px;
   background: var(--bg-alt);
}

.card h3 {
   margin-top: 0;
   margin-bottom: 6px;
   font-size: 1rem;
}

.card p {
   margin: 0;
   font-size: 0.88rem;
   color: var(--text-muted);
}

.menu-toggle {
   display: none;
}

@media (max-width: 860px) {
   .layout {
      flex-direction: column;
   }

   .sidebar {
      width: 100%;
      height: auto;
      position: relative;
      border-right: none;
      border-bottom: 1px solid var(--border);
   }

   .content {
      max-width: 100%;
      padding: 24px 18px 60px;
   }
}