:root {
  --sidebar-width: 300px;
  --bg: #fafafa;
  --bg-sidebar: #1a1a2e;
  --text: #222;
  --text-sidebar: #e0e0e0;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --border: #ddd;
  --code-bg: #f4f4f5;
  --mark-bg: #fef08a;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
#sidebar {
  width: var(--sidebar-width);
  background: var(--bg-sidebar);
  color: var(--text-sidebar);
  height: 100vh;
  position: sticky;
  top: 0;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  flex-shrink: 0;
}

.sidebar-header {
  padding: 1.2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-header h2 { font-size: 1.1rem; }
.sidebar-header h2 a { color: #fff; text-decoration: none; }

#sidebar-toggle {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0 0.3rem;
}

.sidebar-search { padding: 0.8rem; position: relative; }

#search-input {
  width: 100%;
  padding: 0.5rem 0.7rem;
  border-radius: 6px;
  border: 1px solid rgba(255,255,255,0.15);
  background: rgba(255,255,255,0.08);
  color: #fff;
  font-size: 0.85rem;
  outline: none;
}
#search-input::placeholder { color: #888; }
#search-input:focus { border-color: var(--accent); }

#search-results {
  position: absolute;
  top: 100%;
  left: 0.8rem;
  right: 0.8rem;
  background: #fff;
  color: #222;
  border-radius: 0 0 8px 8px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.2);
  max-height: 300px;
  overflow-y: auto;
  display: none;
  z-index: 10;
}
#search-results.has-results { display: block; }
#search-results a {
  display: block;
  padding: 0.6rem 0.8rem;
  text-decoration: none;
  color: #222;
  font-size: 0.85rem;
  border-bottom: 1px solid #eee;
}
#search-results a:hover { background: #eef2ff; }
#search-results a:last-child { border-bottom: none; }
#search-results .search-path {
  font-size: 0.7rem;
  color: #888;
  display: block;
}

#sidebar-nav { flex: 1; padding: 0.3rem 0; overflow-y: auto; }

/* Folder (level 1) */
.nav-folder { margin-bottom: 0; }

.nav-folder-header {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  width: 100%;
  padding: 0.45rem 1rem;
  background: none;
  border: none;
  color: #e2e8f0;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  cursor: pointer;
  text-align: left;
  transition: background 0.15s;
}
.nav-folder-header:hover { background: rgba(255,255,255,0.06); }
.nav-folder-header::before {
  content: '\25B6';
  font-size: 0.55rem;
  color: #64748b;
  transition: transform 0.2s;
  flex-shrink: 0;
}
.nav-folder-header.open::before {
  transform: rotate(90deg);
}

.nav-folder-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.2s ease;
}
.nav-folder-content.open {
  max-height: 2000px;
}

/* Subfolder (level 2) */
.nav-subfolder { margin: 0; }

.nav-subfolder-header {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  width: 100%;
  padding: 0.3rem 1rem 0.3rem 1.6rem;
  background: none;
  border: none;
  color: #94a3b8;
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  text-align: left;
  transition: background 0.15s;
}
.nav-subfolder-header:hover { background: rgba(255,255,255,0.05); }
.nav-subfolder-header::before {
  content: '\25B6';
  font-size: 0.5rem;
  color: #64748b;
  transition: transform 0.2s;
  flex-shrink: 0;
}
.nav-subfolder-header.open::before {
  transform: rotate(90deg);
}

.nav-subfolder-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.2s ease;
}
.nav-subfolder-content.open {
  max-height: 2000px;
}

/* Nav items (pages) */
.nav-item {
  display: block;
  padding: 0.28rem 1rem 0.28rem 2.4rem;
  color: #cbd5e1;
  text-decoration: none;
  font-size: 0.82rem;
  transition: background 0.15s;
  border-left: 2px solid transparent;
}
.nav-subfolder .nav-item {
  padding-left: 2.8rem;
}
.nav-item:hover, .nav-item.active {
  background: rgba(255,255,255,0.06);
  color: #fff;
}
.nav-item.active {
  border-left-color: var(--accent);
}

.sidebar-footer {
  padding: 0.8rem 1.2rem;
  font-size: 0.75rem;
  color: #64748b;
  border-top: 1px solid rgba(255,255,255,0.08);
}

/* Content area */
#content {
  flex: 1;
  padding: 2rem 3rem;
  max-width: 900px;
  min-width: 0;
}

#content h1 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border);
  color: #111;
}

#content h2 {
  font-size: 1.5rem;
  margin-top: 2rem;
  margin-bottom: 0.8rem;
  color: #1a1a2e;
}

#content h3 {
  font-size: 1.2rem;
  margin-top: 1.5rem;
  margin-bottom: 0.6rem;
}

#content p { margin-bottom: 1rem; }
#content ul, #content ol { margin-bottom: 1rem; padding-left: 1.5rem; }
#content li { margin-bottom: 0.3rem; }

#content a { color: var(--accent); text-decoration: none; }
#content a:hover { text-decoration: underline; }

#content code {
  background: var(--code-bg);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.88em;
  font-family: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, monospace;
}

#content pre {
  background: var(--code-bg);
  padding: 1rem;
  border-radius: 8px;
  overflow-x: auto;
  margin-bottom: 1rem;
  border: 1px solid var(--border);
}

#content blockquote {
  border-left: 4px solid var(--accent);
  padding: 0.5rem 1rem;
  margin: 1rem 0;
  background: #f0f7ff;
  border-radius: 0 8px 8px 0;
}

#content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

mark {
  background: var(--mark-bg);
  padding: 0.1rem 0.2rem;
  border-radius: 3px;
}

/* Tag badges */
.tag-badge {
  display: inline-block;
  background: #e0e7ff;
  color: #3730a3;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-size: 0.75rem;
  margin-right: 0.3rem;
}

.tag-badge.aws { background: #ffedd5; color: #9a3412; }

/* See Also section */
.see-also {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}
.see-also h3 {
  font-size: 1rem;
  color: #64748b;
  margin-bottom: 0.5rem;
}

/* Index page / directory listing */
.dir-listing { list-style: none; padding: 0; }
.dir-listing li {
  padding: 0.5rem 0;
  border-bottom: 1px solid #eee;
}
.dir-listing li:last-child { border-bottom: none; }
.dir-listing a {
  font-size: 1rem;
  font-weight: 500;
}
.dir-listing .file-count {
  font-size: 0.8rem;
  color: #888;
  display: block;
}

/* Overlay for mobile */
#overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 98;
}
#overlay.show { display: block; }

/* Responsive */
@media (max-width: 768px) {
  #sidebar {
    position: fixed;
    left: -100%;
    top: 0;
    height: 100vh;
    z-index: 99;
    transition: left 0.25s ease;
    width: 280px;
  }
  #sidebar.open { left: 0; }
  #sidebar-toggle { display: block; }

  #content {
    padding: 1.2rem;
  }
}

@media print {
  #sidebar { display: none; }
  #content { max-width: none; padding: 0; }
  #content a { color: inherit; }
}