/* ============================================================================
   PatinaDB brand theme for mdBook  —  "metal that remembers"
   Distilled from the design system (designs/): the rust→amber→verdigris patina
   gradient IS the brand; carbon-green ground; Space Grotesk + JetBrains Mono;
   blue (--raft-blue) reserved exclusively for Raft/cluster topics.
   Applied by overriding the `navy` theme (book.toml default-theme = "navy").
   ============================================================================ */

@import url("https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap");

:root {
  --patina-rust: #e2683f;
  --patina-amber: #f0a93a;
  --patina-verdigris: #2dd4a7;
  --patina-gradient: linear-gradient(100deg, #e2683f 0%, #f0a93a 48%, #2dd4a7 100%);
  --raft-blue: #6db3f2;

  --pa-ground: #080b0a;
  --pa-surface: #0c1210;
  --pa-surface-2: #0f1613;
  --pa-border: #17211d;
  --pa-border-strong: #243b34;
  --pa-border-teal: rgba(45, 212, 167, 0.34);
  --pa-text: #c3ccd8;
  --pa-text-bright: #e6ecf3;
  --pa-text-dim: #8794a6;

  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
}

/* ---- Map the brand palette onto mdBook's `navy` theme variables ---------- */
.navy {
  --bg: var(--pa-ground);
  --fg: var(--pa-text);

  --sidebar-bg: #0a0f0d;
  --sidebar-fg: var(--pa-text-dim);
  --sidebar-non-existant: #4a5560;
  --sidebar-active: var(--patina-verdigris);
  --sidebar-spacer: var(--pa-border);

  --scrollbar: #2a3a34;

  --icons: #55636f;
  --icons-hover: var(--patina-verdigris);

  --links: var(--patina-verdigris);

  --inline-code-color: var(--patina-amber);

  --theme-popup-bg: var(--pa-surface);
  --theme-popup-border: var(--pa-border-strong);
  --theme-hover: var(--pa-surface-2);

  --quote-bg: var(--pa-surface);
  --quote-border: var(--pa-border-strong);

  --warning-border: var(--patina-amber);

  --table-border-color: var(--pa-border-strong);
  --table-header-bg: var(--pa-surface-2);
  --table-alternate-bg: #0a0f0d;

  --searchbar-border-color: var(--pa-border-strong);
  --searchbar-bg: var(--pa-surface);
  --searchbar-fg: var(--pa-text-bright);
  --searchbar-shadow-color: rgba(0, 0, 0, 0.5);
  --searchresults-header-fg: var(--pa-text-dim);
  --searchresults-border-color: var(--pa-border);
  --searchresults-li-bg: var(--pa-surface-2);
  --search-mark-bg: rgba(240, 169, 58, 0.35);

  --color-scheme: dark;
}

/* ---- Ambient brand glows on the page ground ------------------------------ */
.navy body {
  background-color: var(--pa-ground);
  background-image:
    radial-gradient(60rem 40rem at 100% -10%, rgba(226, 104, 63, 0.08), transparent 60%),
    radial-gradient(50rem 40rem at -10% 20%, rgba(45, 212, 167, 0.07), transparent 60%),
    radial-gradient(50rem 40rem at 50% 120%, rgba(240, 169, 58, 0.05), transparent 60%);
  background-attachment: fixed;
}

/* ---- Typography ---------------------------------------------------------- */
.navy .content {
  font-family: var(--font-display);
}
.navy .content h1,
.navy .content h2,
.navy .content h3,
.navy .content h4,
.navy .content h5 {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--pa-text-bright);
  letter-spacing: -0.02em;
}

/* The payoff move: the page title is the gradient-clipped span. */
.navy .content h1 {
  letter-spacing: -0.035em;
  background: var(--patina-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  padding-bottom: 0.15em;
}
/* h2 gets a short gradient underline accent. */
.navy .content h2 {
  padding-bottom: 0.28em;
  border-bottom: 1px solid var(--pa-border);
  position: relative;
}
.navy .content h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 3.2rem;
  height: 2px;
  background: var(--patina-gradient);
}

.navy .content a,
.navy .content a > code {
  color: var(--patina-verdigris);
  text-decoration-color: var(--pa-border-teal);
}
.navy .content a:hover {
  filter: brightness(1.12);
}

/* ---- Code: JetBrains Mono, carbon surface, teal edge --------------------- */
.navy code {
  font-family: var(--font-mono);
  font-feature-settings: "liga" 0;
}
.navy .content :not(pre) > code {
  background: rgba(240, 169, 58, 0.08);
  border: 1px solid rgba(240, 169, 58, 0.18);
  border-radius: 6px;
  padding: 0.1em 0.4em;
  font-size: 0.88em;
}
.navy pre > code {
  background: var(--pa-surface) !important;
  border: 1px solid var(--pa-border);
  border-left: 2px solid var(--patina-verdigris);
  border-radius: 10px;
  display: block;
  font-size: 0.9em;
  line-height: 1.55;
}

/* ---- Blockquotes as brand cards (flat, 1px border, gradient top-bar) ------ */
.navy blockquote {
  background: var(--pa-surface);
  border: 1px solid var(--pa-border-strong);
  border-radius: 13px;
  padding: 0.9rem 1.15rem;
  color: var(--pa-text);
  position: relative;
  overflow: hidden;
}
.navy blockquote::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--patina-gradient);
}

/* ---- Tables -------------------------------------------------------------- */
.navy .content table {
  border-radius: 10px;
  overflow: hidden;
}
.navy .content table th {
  font-family: var(--font-mono);
  font-size: 0.82em;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--pa-text-dim);
}

/* ---- Chrome: sidebar, menu bar, active chapter --------------------------- */
.navy .sidebar {
  border-right: 1px solid var(--pa-border);
}
.navy .chapter li.chapter-item a {
  font-family: var(--font-display);
}
.navy .chapter li.chapter-item a.active {
  color: var(--patina-verdigris);
  font-weight: 600;
}
.navy .sidebar .sidebar-scrollbox {
  scrollbar-color: var(--scrollbar) transparent;
}
.navy #menu-bar,
.navy .menu-bar {
  background: rgba(8, 11, 10, 0.72);
  backdrop-filter: blur(9px);
  border-bottom: 1px solid var(--pa-border);
}
.navy .menu-title {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--pa-text-bright);
}

/* ---- Diamond bullets — the brand's bullet is a rotated square ------------- */
.navy .content ul > li {
  list-style: none;
  position: relative;
}
.navy .content ul > li::before {
  content: "";
  position: absolute;
  left: -1.15em;
  top: 0.62em;
  width: 5px;
  height: 5px;
  background: var(--patina-verdigris);
  transform: rotate(45deg);
  opacity: 0.85;
}

/* Keep task-list and nested markers from inheriting the diamond. */
.navy .content ul > li.task-list-item::before {
  content: none;
}