/* =============================================================================
   gemini-rs mdBook custom theme
   Applied on top of mdBook's built-in 'ayu' (dark) / 'light' themes.
   ============================================================================= */

/* ── Google Fonts ─────────────────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ── Brand tokens ─────────────────────────────────────────────────────────── */
:root {
  --brand:          #4f46e5;
  --brand-light:    #818cf8;
  --brand-glow:     rgba(79, 70, 229, 0.15);
  --radius:         8px;
  --radius-lg:      12px;
}

/* ── Base typography ──────────────────────────────────────────────────────── */
body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif !important;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

.content main {
  max-width: 860px;
}

/* ── Headings ─────────────────────────────────────────────────────────────── */
h1, h2, h3, h4, h5 {
  font-family: 'Inter', system-ui, sans-serif;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

h1 {
  font-size: 2rem;
  font-weight: 800;
  margin-top: 0;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--brand);
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: 1.5rem;
  margin-top: 2.5rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--quote-border);
}

h3 {
  font-size: 1.2rem;
  margin-top: 2rem;
  color: var(--brand-light);
}

h4 {
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 1.5rem;
  opacity: 0.85;
}

/* ── Links ────────────────────────────────────────────────────────────────── */
a {
  color: var(--brand-light) !important;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s, color 0.15s;
}

a:hover {
  border-bottom-color: var(--brand-light);
}

/* ── Code: inline ─────────────────────────────────────────────────────────── */
code {
  font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace !important;
  font-size: 0.85em;
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-feature-settings: "liga" 1, "calt" 1;
}

/* ── Code: blocks ─────────────────────────────────────────────────────────── */
pre {
  border-radius: var(--radius-lg) !important;
  border: 1px solid rgba(255,255,255,0.08) !important;
  box-shadow: 0 4px 24px rgba(0,0,0,0.25) !important;
  position: relative;
  overflow: hidden;
}

pre::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand) 0%, var(--brand-light) 100%);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

pre code {
  font-family: 'JetBrains Mono', 'Fira Code', monospace !important;
  font-size: 0.875rem !important;
  line-height: 1.65 !important;
  padding: 0 !important;
  border-radius: 0 !important;
}

/* ── Tables ───────────────────────────────────────────────────────────────── */
table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.5rem 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 1px 8px rgba(0,0,0,0.15);
}

thead tr {
  background: var(--brand) !important;
}

thead th {
  color: #ffffff !important;
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.75rem 1rem !important;
  border: none !important;
}

tbody tr:nth-child(even) {
  background: rgba(79, 70, 229, 0.05);
}

tbody tr:hover {
  background: rgba(79, 70, 229, 0.1);
  transition: background 0.15s;
}

td, th {
  padding: 0.6rem 1rem !important;
  border-bottom: 1px solid var(--quote-border) !important;
  border-top: none !important;
  border-left: none !important;
  border-right: none !important;
  vertical-align: top;
}

/* ── Blockquote → styled callout ─────────────────────────────────────────── */
blockquote {
  border-left: 4px solid var(--brand) !important;
  background: var(--brand-glow) !important;
  margin: 1.5rem 0 !important;
  padding: 1rem 1.25rem !important;
  border-radius: 0 var(--radius) var(--radius) 0 !important;
  font-style: normal !important;
}

blockquote p {
  margin: 0;
}

blockquote p:first-child::before {
  content: '💡 ';
}

/* ── Sidebar ──────────────────────────────────────────────────────────────── */
#sidebar {
  background: var(--bg) !important;
  border-right: 1px solid var(--quote-border) !important;
}

#sidebar .sidebar-scrollbox {
  padding: 1.5rem 0.75rem;
}

.sidebar .chapter li a {
  border-radius: var(--radius) !important;
  padding: 0.3rem 0.75rem !important;
  margin: 0.1rem 0 !important;
  display: block;
  transition: background 0.15s, color 0.15s;
  font-size: 0.9rem;
}

.sidebar .chapter li a:hover {
  background: var(--brand-glow) !important;
  border-bottom: none !important;
}

.sidebar .chapter li a.active {
  background: var(--brand) !important;
  color: #ffffff !important;
  font-weight: 600;
}

/* ── Nav bar ──────────────────────────────────────────────────────────────── */
#menu-bar {
  backdrop-filter: blur(12px) !important;
  border-bottom: 1px solid var(--quote-border) !important;
}

/* ── Search ───────────────────────────────────────────────────────────────── */
#searchbar {
  border-radius: var(--radius) !important;
  border: 1px solid var(--brand) !important;
  box-shadow: 0 0 0 3px var(--brand-glow) !important;
  font-family: 'Inter', sans-serif !important;
}

/* ── Page nav buttons ────────────────────────────────────────────────────────*/
.nav-chapters {
  border-radius: var(--radius) !important;
  transition: background 0.15s, transform 0.15s !important;
}

.nav-chapters:hover {
  background: var(--brand-glow) !important;
  transform: scale(1.05);
}

/* ── hr divider ───────────────────────────────────────────────────────────── */
hr {
  border: none !important;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--brand), transparent) !important;
  margin: 2.5rem 0 !important;
  opacity: 0.5;
}

/* ── Scrollbar (Webkit) ───────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--brand); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--brand-light); }

/* ── "Note" / "Warning" admonish-style callouts via raw HTML in .md files ── */
/* Usage in .md: <div class="callout note">...</div>                          */
.callout {
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  border-left: 4px solid;
  font-size: 0.95rem;
}

.callout.note {
  border-color: var(--brand);
  background: var(--brand-glow);
}

.callout.warning {
  border-color: #f59e0b;
  background: rgba(245, 158, 11, 0.1);
}

.callout.danger {
  border-color: #ef4444;
  background: rgba(239, 68, 68, 0.1);
}

.callout.tip {
  border-color: #10b981;
  background: rgba(16, 185, 129, 0.1);
}

.callout-title {
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}

/* ── Mobile tweaks ────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  h1 { font-size: 1.6rem; }
  h2 { font-size: 1.3rem; }
  pre { border-radius: var(--radius) !important; }
  table { font-size: 0.85rem; }
}