/* ============================================
   Observer Docs — Custom Theme
   Styled after observe.vision

   SCALE: change --base only to resize everything.
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500&family=IBM+Plex+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;1,400&display=swap');

/* ── Design tokens ── */
:root {
  /* Single source of truth for scale — change this to resize everything */
  --base: 15px;

  /* Proportional type scale (all relative to --base via rem) */
  --text-xs:   0.7rem;   /* labels, badges     ~12px */
  --text-sm:   0.85rem;  /* small UI           ~14px */
  --text-base: 1rem;     /* body               ~17px */
  --text-md:   1.15rem;  /* large body         ~20px */
  --text-lg:   1.4rem;   /* h3                 ~24px */
  --text-xl:   1.85rem;  /* h2                 ~31px */
  --text-2xl:  2.5rem;   /* h1                 ~43px */

  /* Colors */
  --bg:             #000000;
  --bg-sidebar:     #050505;
  --bg-code:        #0f0f0f;
  --bg-input:       #0d0d0d;

  --text:           #ffffff;
  --text-body:      rgba(255, 255, 255, 0.5);
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-muted:     rgba(255, 255, 255, 0.3);
  --text-label:     rgba(255, 255, 255, 0.25);

  --accent:         #458CFD;
  --accent-green:   #45FD7C;
  --accent-pink:    #FD4579;
  --accent-yellow:  #F1BF45;

  --border:         rgba(255, 255, 255, 0.08);
  --border-mid:     rgba(255, 255, 255, 0.2);
  --border-strong:  rgba(255, 255, 255, 0.5);
  --border-accent:  rgba(69, 140, 253, 0.5);

  --font-sans: 'IBM Plex Sans', Arial, Helvetica, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
}

/* ── Force dark on all mdBook themes ── */
.coal, .navy, .ayu, .rust, .light {
  --bg:             #000000 !important;
  --sidebar-bg:     #050505 !important;
  --fg:             rgba(255, 255, 255, 0.5) !important;
  --sidebar-fg:     rgba(255, 255, 255, 0.5) !important;
  --sidebar-active: #458CFD !important;
  --links:          #458CFD !important;
  --inline-code-color: #458CFD !important;
  --theme-hover:    rgba(255, 255, 255, 0.03) !important;
  --quote-bg:       rgba(69, 140, 253, 0.04) !important;
  --quote-border:   #458CFD !important;
  --table-border-color: rgba(255, 255, 255, 0.08) !important;
  --table-header-bg: rgba(255, 255, 255, 0.04) !important;
  --table-alternate-bg: rgba(255, 255, 255, 0.02) !important;
  --searchbar-bg:   #0d0d0d !important;
  --searchbar-fg:   #ffffff !important;
  --code-bg:        #0f0f0f !important;
  --menu-bar-bg:    rgba(0, 0, 0, 0.92) !important;
}

/* ── Base ── */
html {
  font-size: var(--base) !important;
}

body {
  background: var(--bg) !important;
  color: var(--text-body) !important;
  font-family: var(--font-sans) !important;
  font-size: var(--text-base) !important;
  line-height: 1.7 !important;
}

/* Force font size on all main content elements */
.content main,
.content main p,
.content main li,
.content main td,
.content main blockquote {
  font-size: var(--text-base) !important;
  font-family: var(--font-sans) !important;
}

/* ── Menu bar ── */
.menu-bar {
  background: rgba(0, 0, 0, 0.92) !important;
  border-bottom: 1px solid var(--border) !important;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.menu-title {
  color: var(--text) !important;
  font-family: var(--font-sans) !important;
  font-size: var(--text-sm) !important;
  font-weight: 500 !important;
  letter-spacing: 0.12em !important;
  text-transform: uppercase;
}

.icon-button {
  color: rgba(255, 255, 255, 0.4) !important;
  border-radius: 0 !important;
  transition: color 0.2s !important;
}
.icon-button:hover {
  color: var(--text) !important;
  background: transparent !important;
}

/* ── Sidebar ── */
.sidebar,
.sidebar-scrollbox {
  background: var(--bg-sidebar) !important;
  font-size: var(--base) !important;
}

.sidebar {
  border-right: 1px solid var(--border) !important;
}

.sidebar-scrollbox {
  padding: 1.5rem 0 !important;
}

.chapter li a {
  color: rgba(255, 255, 255, 0.5) !important;
  font-size: var(--text-base) !important;
  font-family: var(--font-sans) !important;
  letter-spacing: 0.01em !important;
  border-radius: 0 !important;
  padding: 0.55rem 1.5rem !important;
  transition: color 0.2s, background 0.2s !important;
  display: block;
  line-height: 1.4;
}
.chapter li a:hover {
  color: var(--text) !important;
  background: rgba(255, 255, 255, 0.03) !important;
}
.chapter li a.active {
  color: var(--accent) !important;
  background: rgba(69, 140, 253, 0.04) !important;
  border-left: 2px solid var(--accent) !important;
  padding-left: calc(1.5rem - 2px) !important;
}

.chapter li.part-title {
  color: rgba(255, 255, 255, 0.2) !important;
  font-size: var(--text-xs) !important;
  font-weight: 500 !important;
  letter-spacing: 0.12em !important;
  text-transform: uppercase;
  font-family: var(--font-mono) !important;
  padding: 1.75rem 1.5rem 0.5rem !important;
}

/* ── Content ── */
.content {
  background: var(--bg) !important;
}

.content main {
  color: var(--text-body);
  font-size: var(--text-base);
  padding: 3rem 4rem 6rem;
  max-width: 900px;
}

/* ── Headings ── */
.content h1,
.content h2,
.content h3,
.content h4,
.content h5,
.content h6 {
  font-family: var(--font-sans) !important;
  font-weight: 500;
  line-height: 1.1;
}

.content h1 {
  color: var(--accent);
  font-size: var(--text-2xl) !important;
  letter-spacing: -0.02em;
  margin-top: 2rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  display: table;
  border-bottom: 1px solid var(--accent);
}

.content h1 a,
.content h1 a:hover {
  color: inherit !important;
  border-bottom: none !important;
  text-decoration: none !important;
}

.content h2 {
  color: var(--accent);
  font-size: var(--text-xl) !important;
  letter-spacing: -0.01em;
  margin-top: 2.5rem;
  margin-bottom: 0.85rem;
  padding-bottom: 0.5rem;
  display: table;
  border-bottom: 1px solid var(--border-mid);
}

.content h2 a,
.content h2 a:hover {
  color: inherit !important;
  border-bottom: none !important;
  text-decoration: none !important;
}

.content h3 {
  color: rgba(69, 140, 253, 0.6);
  font-size: var(--text-lg) !important;
  letter-spacing: 0.01em;
  margin-top: 2rem;
  margin-bottom: 0.6rem;
}

.content h3 a,
.content h3 a:hover {
  color: inherit !important;
  border-bottom: none !important;
  text-decoration: none !important;
}

.content h4,
.content h5,
.content h6 {
  color: rgba(255, 255, 255, 0.6);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-family: var(--font-mono) !important;
  margin-top: 1.5rem;
}

/* ── Body text & lists ── */
.content p,
.content ul,
.content ol {
  font-size: var(--text-base);
  color: var(--text-body);
  line-height: 1.75;
}

.content li {
  margin-bottom: 0.35rem;
}

/* ── Links ── */
.content a {
  color: var(--accent) !important;
  text-decoration: none;
  border-bottom: 1px solid rgba(69, 140, 253, 0.3);
  transition: color 0.2s, border-color 0.2s;
}
.content a:hover {
  color: var(--text) !important;
  border-bottom-color: rgba(255, 255, 255, 0.4);
}

/* ── Code ── */
pre {
  background: var(--bg-code) !important;
  border: 1px solid var(--border-mid) !important;
  border-radius: 0 !important;
  padding: 1.5rem 2rem !important;
  font-family: var(--font-mono) !important;
  font-size: var(--text-base) !important;
  line-height: 1.65 !important;
}

pre code {
  font-family: var(--font-mono) !important;
  font-size: var(--text-base) !important;
}

code {
  font-family: var(--font-mono) !important;
  font-size: var(--text-base) !important;
}

:not(pre) > code {
  background: rgba(255, 255, 255, 0.05) !important;
  border: 1px solid var(--border) !important;
  border-radius: 0 !important;
  color: var(--accent) !important;
  padding: 0.15em 0.45em !important;
  font-size: 0.9em !important;
}

.copy-button {
  background: transparent !important;
  border: 1px solid rgba(255, 255, 255, 0.12) !important;
  color: rgba(255, 255, 255, 0.3) !important;
  border-radius: 0 !important;
  padding: 0.3rem 0.5rem !important;
  cursor: pointer !important;
  transition: color 0.2s, border-color 0.2s !important;
}
.copy-button:hover {
  color: var(--accent) !important;
  border-color: var(--border-accent) !important;
  background: transparent !important;
}

/* ── Blockquotes ── */
blockquote {
  background: rgba(69, 140, 253, 0.04) !important;
  border-left: 2px solid var(--accent) !important;
  border-radius: 0 !important;
  margin: 1.5rem 0 !important;
  padding: 0.6rem 1.25rem !important;
  color: var(--text-body) !important;
  font-size: var(--text-base) !important;
}
blockquote p {
  margin-top: 0 !important;
  margin-bottom: 0 !important;
}

/* ── Tables ── */
table {
  border-collapse: collapse !important;
  width: 100% !important;
  font-size: var(--text-base) !important;
}

th {
  background: rgba(255, 255, 255, 0.04) !important;
  color: rgba(255, 255, 255, 0.4) !important;
  font-size: var(--text-xs) !important;
  font-weight: 500 !important;
  letter-spacing: 0.1em !important;
  text-transform: uppercase !important;
  font-family: var(--font-mono) !important;
  padding: 0.85rem 1.25rem !important;
  border: 1px solid var(--border) !important;
  text-align: left !important;
}

td {
  padding: 0.75rem 1.25rem !important;
  border: 1px solid var(--border) !important;
  color: var(--text-body) !important;
  font-size: var(--text-base) !important;
}

tr:nth-child(even) td {
  background: rgba(255, 255, 255, 0.01) !important;
}
tr:hover td {
  background: rgba(255, 255, 255, 0.025) !important;
}

/* ── Nav buttons (prev / next) ── */
.nav-wrapper {
  border-top: 1px solid var(--border) !important;
  padding: 1.5rem 0 2rem !important;
  display: flex;
  justify-content: center;
  gap: 1rem;
}

.nav-wrapper a.nav-chapters {
  color: rgba(255, 255, 255, 0.35) !important;
  font-size: var(--text-xs) !important;
  font-family: var(--font-mono) !important;
  letter-spacing: 0.08em !important;
  text-transform: uppercase !important;
  text-decoration: none !important;
  border: 1px solid rgba(255, 255, 255, 0.15) !important;
  padding: 0.65rem 1.25rem !important;
  position: relative !important;
  transition: color 0.2s, border-color 0.2s !important;
  background: transparent !important;
}
.nav-wrapper a.nav-chapters:hover {
  color: var(--text) !important;
  border-color: rgba(255, 255, 255, 0.5) !important;
  background: transparent !important;
}

.nav-wrapper a.nav-chapters::before,
.nav-wrapper a.nav-chapters::after {
  content: '';
  position: absolute;
  width: 6px;
  height: 6px;
  border-color: rgba(255, 255, 255, 0.3);
  border-style: solid;
  transition: border-color 0.2s, transform 0.2s;
}
.nav-wrapper a.nav-chapters:hover::before,
.nav-wrapper a.nav-chapters:hover::after {
  border-color: rgba(255, 255, 255, 0.7);
}
.previous a.nav-chapters::before { top: -1px; left: -1px; border-width: 1px 0 0 1px; }
.previous a.nav-chapters:hover::before { transform: translate(-2px, -2px); }
.previous a.nav-chapters::after  { bottom: -1px; right: -1px; border-width: 0 1px 1px 0; }
.previous a.nav-chapters:hover::after  { transform: translate(2px, 2px); }
.next a.nav-chapters::before { top: -1px; right: -1px; border-width: 1px 1px 0 0; }
.next a.nav-chapters:hover::before { transform: translate(2px, -2px); }
.next a.nav-chapters::after  { bottom: -1px; left: -1px; border-width: 0 0 1px 1px; }
.next a.nav-chapters:hover::after  { transform: translate(-2px, 2px); }

/* ── Search ── */
#searchbar {
  background: var(--bg-input) !important;
  border: 1px solid var(--border) !important;
  border-radius: 0 !important;
  color: var(--text) !important;
  font-family: var(--font-sans) !important;
  font-size: var(--text-sm) !important;
  padding: 0.6rem 1rem !important;
  outline: none !important;
  transition: border-color 0.2s !important;
}
#searchbar:focus {
  border-color: rgba(255, 255, 255, 0.35) !important;
}
#searchbar::placeholder {
  color: rgba(255, 255, 255, 0.2) !important;
  font-family: var(--font-mono) !important;
  font-size: var(--text-sm) !important;
  letter-spacing: 0.04em !important;
}

.searchresults-outer {
  background: var(--bg) !important;
  border: 1px solid var(--border-mid) !important;
  border-radius: 0 !important;
}
.searchresults-header {
  color: var(--text-label) !important;
  font-size: var(--text-xs) !important;
  letter-spacing: 0.1em !important;
  text-transform: uppercase !important;
  font-family: var(--font-mono) !important;
  padding: 0.75rem 1rem !important;
  border-bottom: 1px solid var(--border) !important;
}
#searchresults li { border-bottom: 1px solid var(--border) !important; }
#searchresults a {
  color: var(--text-secondary) !important;
  font-size: var(--text-sm) !important;
  padding: 0.65rem 1rem !important;
  transition: color 0.2s, background 0.2s !important;
  display: block;
}
#searchresults a:hover {
  color: var(--text) !important;
  background: rgba(255, 255, 255, 0.03) !important;
  border-bottom: none !important;
}
.teaser {
  color: var(--text-muted) !important;
  font-size: var(--text-xs) !important;
  font-family: var(--font-mono) !important;
}

mark {
  background: rgba(69, 140, 253, 0.18) !important;
  color: var(--accent) !important;
  border-radius: 0 !important;
  padding: 0.05em 0.2em !important;
}

/* ── Theme popup ── */
.theme-popup {
  background: var(--bg) !important;
  border: 1px solid var(--border-mid) !important;
  border-radius: 0 !important;
  padding: 0.2rem 0 !important;
}
.theme-popup .theme {
  color: rgba(255, 255, 255, 0.4) !important;
  font-family: var(--font-mono) !important;
  font-size: var(--text-sm) !important;
  letter-spacing: 0.06em !important;
  border-radius: 0 !important;
  transition: color 0.2s, background 0.2s !important;
}
.theme-popup .theme:hover,
.theme-popup .theme-selected {
  color: var(--text) !important;
  background: rgba(255, 255, 255, 0.05) !important;
}

/* ── HR ── */
hr {
  border: none !important;
  border-top: 1px solid var(--border) !important;
  margin: 2rem 0 !important;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 4px; height: 4px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.12); }
::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, 0.25); }

/* ── Hide side nav arrows ── */
.nav-wide-wrapper {
  display: none !important;
}

/* ── Hide theme switcher ── */
#mdbook-theme-toggle,
.theme-popup {
  display: none !important;
}

/* ── Selection ── */
::selection {
  background: rgba(69, 140, 253, 0.25);
  color: var(--text);
}