/* Mobius Theme System — 6 moon phases × 2 modes = 12 palettes
   Palette: #DE3373 #FCCA28 #08A953 #F5712A #F59EAF #EE1B3E
            #1E76B8 #7C2E87 #7A0434 #F98F81 #37BA9B #C0C2C2
   Default: dark mode, phase 0 (#DE3373 reference) */

:root {
  /* Current reference color — set by JS, default phase-0 dark */
  --m-ref: #DE3373;
  --m-ref-h: 340; --m-ref-s: 72%; --m-ref-l: 54%;

  /* Dark mode defaults */
  --m-bg: #000000;
  --m-surface: #000000;
  --m-border: #30363d;
  --m-text: #e6edf3;
  --m-text-muted: #8b949e;
  --m-accent: var(--m-ref);
  --m-accent2: #FCCA28;
  --m-accent3: #08A953;
  --m-accent4: #F5712A;
}

/* Force dark by default — JS sets data-mode, but before JS loads this holds */
html { color-scheme: dark; }

/* Light mode — only when explicitly toggled */
[data-mode="light"] {
  color-scheme: light;
  --m-bg: #f6f8fa;
  --m-surface: #ffffff;
  --m-border: #d0d7de;
  --m-text: #1f2328;
  --m-text-muted: #656d76;
}

/* ── Aliases: proslambenomenos convention ── */
:root {
  --bg: var(--m-bg); --surface: var(--m-surface); --border: var(--m-border);
  --text: var(--m-text); --text-muted: var(--m-text-muted);
  --accent: var(--m-accent); --accent2: var(--m-accent2);
  --accent3: var(--m-accent3); --accent4: var(--m-accent4);
  --red: #EE1B3E;
}
/* ── Aliases: 201 convention ── */
:root {
  --fg: var(--m-text); --dim: var(--m-text-muted);
  --card: var(--m-surface);
  --green: var(--m-accent3); --yellow: #FCCA28; --purple: #7C2E87;
}
/* ── Aliases: intersections convention ── */
:root {
  --bg2: var(--m-surface); --fg2: var(--m-text-muted);
}
/* ── PyData Sphinx Theme overrides ── */
html[data-theme="dark"], html[data-mode="dark"], html:not([data-mode]) {
  --pst-color-primary: var(--m-accent);
  --pst-color-secondary: var(--m-accent2);
  --pst-color-background: var(--m-bg);
  --pst-color-on-background: var(--m-text);
  --pst-color-surface: var(--m-surface);
  --pst-color-border: var(--m-border);
}
html[data-theme="light"], html[data-mode="light"] {
  --pst-color-primary: var(--m-accent);
  --pst-color-secondary: var(--m-accent2);
  --pst-color-background: var(--m-bg);
  --pst-color-on-background: var(--m-text);
  --pst-color-surface: var(--m-surface);
  --pst-color-border: var(--m-border);
}

/* ── Moon toggle button ── */
#mobius-moon-toggle {
  background: none; border: 1px solid transparent; cursor: pointer;
  width: 36px; height: 36px; padding: 2px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 50%; transition: background 0.2s, border-color 0.2s;
  vertical-align: middle; position: relative;
}
#mobius-moon-toggle:hover { background: var(--m-border); }
#mobius-moon-toggle svg { width: 26px; height: 26px; }
/* Light mode: ensure moon icon is visible against white background */
[data-mode="light"] #mobius-moon-toggle {
  border-color: var(--m-border);
}
[data-mode="light"] #mobius-moon-toggle svg circle,
[data-mode="light"] #mobius-moon-toggle svg ellipse {
  stroke: var(--m-text-muted);
  stroke-width: 0.5;
}

/* ── Table striping: readable in both modes ── */
table tbody tr:nth-child(odd) {
  background: var(--m-surface);
}
table tbody tr:nth-child(even) {
  background: var(--m-bg);
}
table tbody tr:nth-child(odd) td,
table tbody tr:nth-child(even) td,
table tbody tr:nth-child(odd) th,
table tbody tr:nth-child(even) th {
  color: var(--m-text);
}
/* PyData theme table override */
.bd-content table.table-striped tbody tr:nth-of-type(odd),
.bd-content table tbody tr:nth-child(odd) {
  background-color: var(--m-surface);
  --pst-color-table-row-zebra-low: var(--m-surface);
}
.bd-content table.table-striped tbody tr:nth-of-type(even),
.bd-content table tbody tr:nth-child(even) {
  background-color: var(--m-bg);
  --pst-color-table-row-zebra-high: var(--m-bg);
}

/* ── Hover nav: stay visible longer, larger hover target at 125%+ zoom ── */
.mobius-hover-nav {
  padding: 6px 12px;
  margin-top: 2px;
}
.mobius-hover-nav::before {
  /* Invisible bridge above the nav bar so cursor doesn't lose it */
  content: "";
  position: absolute;
  top: -16px; left: 0; right: 0; height: 16px;
}

/* ── Mobile containment: prevent horizontal scroll ── */
html { overflow-x: clip; }
main { overflow-wrap: break-word; }
/* Display math: allow natural width so JS scale-to-fit can measure & shrink */
mjx-container[display="true"], .MathJax[display="true"] { max-width: none !important; overflow: visible !important; }
/* Inline math: no constraints */
.MathJax:not([display="true"]), mjx-container:not([display="true"]) { overflow: visible !important; }
/* Equation blocks: visible overflow (JS scale-to-fit handles containment; html overflow-x:clip is safety net) */
.equation-block { overflow: visible; }

/* ── Copy-on-hover for overflowing content ── */
.copy-overflow-wrap { position: relative; }
.copy-overflow-wrap > .copy-overflow-btn {
  display: none;
  position: absolute;
  top: 2px; right: 2px;
  background: var(--m-surface, #000000);
  border: 1px solid var(--m-border, #30363d);
  color: var(--m-text-muted, #8b949e);
  border-radius: 4px;
  padding: 2px 6px;
  font-size: 11px;
  cursor: pointer;
  z-index: 5;
  line-height: 1.4;
  white-space: nowrap;
}
.copy-overflow-wrap:hover > .copy-overflow-btn { display: block; }
.copy-overflow-btn:hover { color: var(--m-text, #e6edf3); border-color: var(--m-text-muted, #8b949e); }
.copy-overflow-btn.copied { color: var(--m-accent3, #08A953); border-color: var(--m-accent3, #08A953); }

/* ── Smooth scroll & anchor offset ── */
html { scroll-behavior: smooth; scroll-padding-top: 1.5em; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

/* ── Page nav bar (shared across reference pages) ── */
#page-nav {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 100;
  background: var(--m-surface, rgba(30,35,44,0.97));
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid rgba(200,200,200,0.25);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 2rem;
  padding: 10px 16px;
  font-size: 0.8rem;
  font-family: sans-serif;
}
#page-nav a {
  color: var(--m-text-muted, #8b949e);
  text-decoration: none;
  transition: color 0.2s;
}
#page-nav a:hover {
  color: var(--m-text, #e6edf3);
  text-decoration: none;
}
#page-nav a.active {
  color: var(--m-accent, #DE3373);
  border-bottom: 2px solid var(--m-accent, #DE3373);
  padding-bottom: 2px;
}

/* ── Responsive: mobile / vertical readers ── */
@media (max-width: 768px) {
  /* Nav bar: horizontal scroll when content outgrows viewport */
  #page-nav {
    justify-content: flex-start;
    gap: 0;
    padding: 0;
    font-size: 0.7rem;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    -ms-overflow-style: none;
  }
  #page-nav::-webkit-scrollbar { display: none; }
  #page-nav a {
    white-space: nowrap;
    padding: 10px 12px;
    flex-shrink: 0;
  }
  #mobius-moon-toggle { width: 28px !important; height: 28px !important; }
  #mobius-moon-toggle svg { width: 18px !important; height: 18px !important; }

  /* Stack grids vertically */
  [style*="grid-template-columns:1fr 1fr"] { grid-template-columns: 1fr !important; }

  /* Reduce padding on standalone pages — fill more horizontal space */
  main { padding-left: 12px !important; padding-right: 12px !important; }

  /* Format accordion: less indent on mobile */
  .fmt-level-1 { padding-left: 0.5rem; }
  .fmt-level-2 { padding-left: 1rem; }
  .fmt-level-3 { padding-left: 1.5rem; }
}

@media (max-width: 480px) {
  #page-nav { font-size: 0.65rem; }
  #page-nav a { padding: 8px 10px; }
}

/* ── Format accordion: expand / collapse ── */
.fmt-section {
  margin: 1.5rem 0;
}
.fmt-level {
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.618, 0, 0.382, 1); /* golden ratio bezier */
  max-height: 0;
}
.fmt-level.active {
  max-height: 4000px;
}
.fmt-level-0 { padding-left: 0; }
.fmt-level-1 { padding-left: 1rem; }
.fmt-level-2 { padding-left: 1.618rem; }
.fmt-level-3 { padding-left: 2.618rem; }

/* Expand trigger — sits at the bottom of the visible content */
.fmt-expand {
  display: block;
  cursor: pointer;
  color: var(--m-text-muted);
  font-size: 0.8rem;
  margin-top: 0.6rem;
  padding: 4px 0;
  user-select: none;
  opacity: 0.5;
  transition: opacity 0.2s, color 0.2s;
  text-align: right;
}
.fmt-expand:hover { opacity: 1; color: var(--m-accent); }

/* Format labels */
.fmt-tag {
  display: inline-block;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 1px 6px;
  border-radius: 3px;
  margin-right: 0.5rem;
  vertical-align: middle;
}
.fmt-tag-conjecture { background: rgba(252,202,40,0.15); color: #FCCA28; }
.fmt-tag-visual { background: rgba(8,169,83,0.15); color: #08A953; }
.fmt-tag-math { background: rgba(88,166,255,0.15); color: #58a6ff; }
.fmt-tag-explanation { background: rgba(139,148,158,0.15); color: #8b949e; }