/* =====================================================================
   pykurucz — editorial documentation theme (MkDocs Material override)
   Cool paper neutrals · single navy accent · serif body, sans UI, mono code

   This CSS ports the "pykurucz-docs" design (Source Serif 4 + Inter Tight +
   JetBrains Mono on a quiet paper background with a deep navy accent) to
   the Material for MkDocs theme. Both light and dark schemes are defined.
   ===================================================================== */

/* --- Webfonts (kept off the critical path; Material loads its own) --- */
@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Source+Serif+4:opsz,wght@8..60,400;8..60,500;8..60,600&family=JetBrains+Mono:wght@400;500;600&display=swap");

/* =====================================================================
   1. DESIGN TOKENS
   ===================================================================== */
:root,
[data-md-color-scheme="default"] {
  /* Cool paper neutrals */
  --pk-bg:        #fbfbfa;
  --pk-bg-soft:   #f4f4f2;
  --pk-bg-sunken: #efeeec;
  --pk-surface:   #ffffff;
  --pk-ink:       #14161a;
  --pk-ink-2:     #2a2d33;
  --pk-muted:     #5b6068;
  --pk-muted-2:   #80858d;
  --pk-faint:     #a8acb3;
  --pk-rule:      #e5e4e1;
  --pk-rule-2:    #ececea;
  --pk-rule-strong: #d2d1cd;

  /* Single accent: deep restrained navy/indigo */
  --pk-accent:        oklch(0.46 0.12 258);
  --pk-accent-2:      oklch(0.40 0.13 258);
  --pk-accent-soft:   oklch(0.96 0.02 258);
  --pk-accent-rule:   oklch(0.88 0.04 258);

  /* Code surfaces (dim, neutral) */
  --pk-code-bg:    #14181f;
  --pk-code-bg-2:  #1c2129;
  --pk-code-ink:   #d8dde4;
  --pk-code-mute:  #8b94a3;
  --pk-code-rule:  #262c36;

  /* Semantic admonition tints (very low saturation) */
  --pk-note:    oklch(0.55 0.10 258);
  --pk-tip:     oklch(0.50 0.08 165);
  --pk-warn:    oklch(0.58 0.12 60);
  --pk-physics: oklch(0.50 0.10 290);

  /* Type scale */
  --pk-serif: "Source Serif 4", "Iowan Old Style", Georgia, serif;
  --pk-sans:  "Inter", "Inter Tight", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --pk-mono:  "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --pk-ease: cubic-bezier(.2,.7,.2,1);

  /* Wire Material's variables to ours so built-in components inherit */
  --md-primary-fg-color:        var(--pk-ink);
  --md-primary-fg-color--light: var(--pk-ink-2);
  --md-primary-fg-color--dark:  #000;
  --md-primary-bg-color:        var(--pk-bg);
  --md-primary-bg-color--light: var(--pk-bg-soft);

  --md-accent-fg-color:         var(--pk-accent);
  --md-accent-fg-color--transparent: var(--pk-accent-soft);
  --md-accent-bg-color:         var(--pk-bg);
  --md-accent-bg-color--light:  var(--pk-accent-soft);

  --md-default-bg-color:        var(--pk-bg);
  --md-default-fg-color:        var(--pk-ink-2);
  --md-default-fg-color--light: var(--pk-muted);
  --md-default-fg-color--lighter: var(--pk-muted-2);
  --md-default-fg-color--lightest: var(--pk-faint);

  --md-code-bg-color:           var(--pk-bg-soft);
  --md-code-fg-color:           var(--pk-ink);

  --md-typeset-color:           var(--pk-ink-2);
  --md-typeset-a-color:         var(--pk-accent);
}

[data-md-color-scheme="slate"] {
  --pk-bg:        #0e1015;
  --pk-bg-soft:   #14171d;
  --pk-bg-sunken: #0a0c10;
  --pk-surface:   #14171d;
  --pk-ink:       #ecedef;
  --pk-ink-2:     #cfd2d8;
  --pk-muted:     #8e939c;
  --pk-muted-2:   #71757d;
  --pk-faint:     #4f535b;
  --pk-rule:      #232831;
  --pk-rule-2:    #1d2129;
  --pk-rule-strong: #2c323d;

  --pk-accent:        oklch(0.74 0.10 258);
  --pk-accent-2:      oklch(0.80 0.10 258);
  --pk-accent-soft:   oklch(0.22 0.04 258);
  --pk-accent-rule:   oklch(0.32 0.06 258);

  --pk-code-bg:    #0a0c10;
  --pk-code-bg-2:  #14171d;
  --pk-code-ink:   #d8dde4;
  --pk-code-mute:  #71757d;
  --pk-code-rule:  #1d2229;

  --md-primary-fg-color:        var(--pk-bg-soft);
  --md-primary-bg-color:        var(--pk-ink);
  --md-default-bg-color:        var(--pk-bg);
  --md-default-fg-color:        var(--pk-ink-2);
  --md-default-fg-color--light: var(--pk-muted);
  --md-default-fg-color--lighter: var(--pk-muted-2);
  --md-default-fg-color--lightest: var(--pk-faint);
  --md-code-bg-color:           var(--pk-bg-soft);
  --md-code-fg-color:           var(--pk-ink);
  --md-typeset-color:           var(--pk-ink-2);
}

/* =====================================================================
   2. BASE TYPOGRAPHY
   ===================================================================== */
body, .md-typeset {
  font-family: var(--pk-serif);
  font-feature-settings: "ss01", "kern";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.md-typeset {
  font-size: 17px;
  line-height: 1.78;
  color: var(--pk-ink-2);
  font-feature-settings: "ss01", "kern", "liga";
}

.md-typeset p,
.md-typeset ul,
.md-typeset ol {
  max-width: 68ch;
}

.md-typeset p {
  margin: 0 0 1.125rem;
}

.md-typeset h1,
.md-typeset h2,
.md-typeset h3,
.md-typeset h4,
.md-typeset h5,
.md-typeset h6 {
  font-family: var(--pk-sans);
  color: var(--pk-ink);
  letter-spacing: -0.02em;
  font-weight: 600;
  text-wrap: balance;
}

.md-typeset h1 {
  font-size: 38px;
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.025em;
  margin: 0 0 0.75rem;
}

.md-typeset h2 {
  font-size: 24px;
  line-height: 1.25;
  margin: 3.5rem 0 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--pk-rule);
}

.md-typeset h3 {
  font-size: 18px;
  line-height: 1.3;
  margin: 2rem 0 0.625rem;
}

.md-typeset h4 {
  font-size: 15px;
  margin: 1.5rem 0 0.5rem;
}

.md-typeset h5 {
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--pk-muted-2);
  margin: 1.25rem 0 0.5rem;
}

.md-typeset strong { color: var(--pk-ink); font-weight: 600; }
.md-typeset em { font-style: italic; }

.md-typeset a {
  color: var(--pk-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s var(--pk-ease);
}
.md-typeset a:hover {
  border-bottom-color: var(--pk-accent);
}

::selection { background: var(--pk-accent-soft); color: var(--pk-ink); }

/* Lists */
.md-typeset ul li,
.md-typeset ol li { margin-bottom: 0.375rem; }
.md-typeset ul li::marker { color: var(--pk-faint); }
.md-typeset ol li::marker { color: var(--pk-muted-2); font-family: var(--pk-mono); font-size: 0.85em; }

/* =====================================================================
   3. LAYOUT — header, tabs, sidebars
   ===================================================================== */
.md-grid { max-width: 1320px; }
.md-sidebar { width: 270px; }
.md-sidebar--secondary { width: 240px; }

.md-header {
  background: color-mix(in oklab, var(--pk-bg) 88%, transparent) !important;
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--pk-rule);
  box-shadow: none !important;
  color: var(--pk-ink);
}

.md-header__title {
  font-family: var(--pk-sans);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.01em;
  color: var(--pk-ink);
}
.md-header__title .md-ellipsis { color: var(--pk-ink); }
.md-header__topic:first-child { font-weight: 600; }

.md-header__button { color: var(--pk-ink-2); }

.md-tabs {
  background: transparent !important;
  border-bottom: 1px solid var(--pk-rule);
  color: var(--pk-ink-2);
}

.md-tabs__link {
  font-family: var(--pk-sans);
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: -0.005em;
  text-transform: none;
  opacity: 0.72;
  color: var(--pk-ink-2);
  transition: opacity 0.15s var(--pk-ease), color 0.15s var(--pk-ease);
}
.md-tabs__link:hover,
.md-tabs__link--active {
  opacity: 1;
  color: var(--pk-ink);
}
.md-tabs__link--active { font-weight: 600; }

/* =====================================================================
   4. SIDEBAR NAV
   ===================================================================== */
.md-nav {
  font-family: var(--pk-sans);
  font-size: 13.5px;
  color: var(--pk-ink-2);
}

.md-nav__title {
  font-family: var(--pk-sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--pk-muted-2);
  padding: 0.5rem 0.625rem 0.25rem;
  background: transparent;
  box-shadow: none;
}

.md-nav__link {
  padding: 0.3rem 0.625rem;
  border-radius: 6px;
  border-left: 2px solid transparent;
  margin-left: -2px;
  line-height: 1.5;
  font-weight: 450;
  color: var(--pk-ink-2);
  transition: background-color 0.15s var(--pk-ease), color 0.15s var(--pk-ease);
}

.md-nav__link:hover {
  color: var(--pk-ink);
  background: var(--pk-bg-soft);
}

.md-nav__link--active,
.md-nav__item--active > .md-nav__link {
  color: var(--pk-accent);
  background: var(--pk-accent-soft);
  border-left-color: var(--pk-accent);
  font-weight: 550;
}

/* Right-side TOC */
.md-nav--secondary .md-nav__title { font-size: 11px; }
.md-nav--secondary .md-nav__link {
  border-left: 2px solid var(--pk-rule);
  border-radius: 0;
  margin-left: 0;
  padding: 0.25rem 0 0.25rem 0.75rem;
  font-size: 13px;
  color: var(--pk-muted);
}
.md-nav--secondary .md-nav__link:hover { background: transparent; color: var(--pk-ink); }
.md-nav--secondary .md-nav__link--active {
  color: var(--pk-accent);
  border-left-color: var(--pk-accent);
  background: transparent;
  font-weight: 500;
}

/* =====================================================================
   5. SEARCH
   ===================================================================== */
.md-search__form {
  border-radius: 8px;
  background: var(--pk-surface);
  border: 1px solid var(--pk-rule);
  height: 36px;
}
.md-search__form:hover { border-color: var(--pk-rule-strong); }
.md-search__input {
  font-family: var(--pk-sans);
  font-size: 13px;
  color: var(--pk-ink-2);
}
.md-search__input::placeholder { color: var(--pk-muted-2); }
.md-search__icon { color: var(--pk-muted-2); }

/* =====================================================================
   6. CODE
   ===================================================================== */
.md-typeset code {
  font-family: var(--pk-mono);
  font-size: 0.86em;
  font-weight: 500;
  padding: 1px 6px;
  border: 1px solid var(--pk-rule);
  border-radius: 4px;
  background: var(--pk-bg-soft);
  color: var(--pk-ink);
}

.md-typeset pre > code,
.md-typeset .highlight pre {
  font-family: var(--pk-mono);
  font-size: 13px;
  line-height: 1.65;
  background: var(--pk-code-bg);
  color: var(--pk-code-ink);
  border: 1px solid var(--pk-rule);
  border-radius: 10px;
  padding: 1rem 1.125rem;
}

.md-typeset pre > code { padding: 0; border: none; background: transparent; }

.md-typeset .highlight {
  border: 1px solid var(--pk-rule);
  border-radius: 10px;
  background: var(--pk-code-bg);
  margin: 1.25rem 0 1.5rem;
  overflow: hidden;
}

.md-typeset .highlight pre {
  border: none;
  border-radius: 0;
  margin: 0;
}

.md-typeset .highlight .filename,
.md-typeset .highlight > span:first-child {
  font-family: var(--pk-mono);
  font-size: 12px;
  color: var(--pk-code-mute);
  background: var(--pk-code-bg-2);
  border-bottom: 1px solid var(--pk-code-rule);
  padding: 0.5rem 0.875rem;
  display: block;
}

/* Copy button */
.md-clipboard {
  color: var(--pk-code-mute);
  font-family: var(--pk-mono);
}
.md-clipboard:hover { color: var(--pk-code-ink); }

/* ---------------------------------------------------------------------
   Pygments token colors — for dark code blocks
   The Material defaults are tuned for a LIGHT code background, so on our
   dark slabs `.n` / `.nb` / `.o` etc. render near-black and become unread-
   able. These overrides are scoped to .highlight (code blocks), so inline
   code on light surface is unaffected.
   --------------------------------------------------------------------- */
.md-typeset .highlight .c,
.md-typeset .highlight .ch,
.md-typeset .highlight .cm,
.md-typeset .highlight .c1,
.md-typeset .highlight .cs,
.md-typeset .highlight .cp,
.md-typeset .highlight .cpf  { color: #6e7785; font-style: italic; }   /* comments */

.md-typeset .highlight .k,
.md-typeset .highlight .kc,
.md-typeset .highlight .kd,
.md-typeset .highlight .kn,
.md-typeset .highlight .kp,
.md-typeset .highlight .kr,
.md-typeset .highlight .kt    { color: #d6a6ff; font-weight: 500; }    /* keywords */

.md-typeset .highlight .s,
.md-typeset .highlight .sa,
.md-typeset .highlight .sb,
.md-typeset .highlight .sc,
.md-typeset .highlight .dl,
.md-typeset .highlight .sd,
.md-typeset .highlight .s2,
.md-typeset .highlight .se,
.md-typeset .highlight .sh,
.md-typeset .highlight .si,
.md-typeset .highlight .sx,
.md-typeset .highlight .sr,
.md-typeset .highlight .s1,
.md-typeset .highlight .ss    { color: #b6e0a3; }                      /* strings */

.md-typeset .highlight .m,
.md-typeset .highlight .mb,
.md-typeset .highlight .mf,
.md-typeset .highlight .mh,
.md-typeset .highlight .mi,
.md-typeset .highlight .il,
.md-typeset .highlight .mo    { color: #f1c27a; }                      /* numbers */

.md-typeset .highlight .nf,
.md-typeset .highlight .fm    { color: #8ec5ff; }                      /* function */

.md-typeset .highlight .nb,
.md-typeset .highlight .bp    { color: #8ec5ff; font-weight: 500; }    /* builtins */

.md-typeset .highlight .n,
.md-typeset .highlight .na,
.md-typeset .highlight .nn,
.md-typeset .highlight .nc,
.md-typeset .highlight .nd,
.md-typeset .highlight .ne,
.md-typeset .highlight .nv,
.md-typeset .highlight .vc,
.md-typeset .highlight .vg,
.md-typeset .highlight .vi,
.md-typeset .highlight .nl,
.md-typeset .highlight .nx    { color: var(--pk-code-ink); }            /* identifiers */

.md-typeset .highlight .o,
.md-typeset .highlight .ow,
.md-typeset .highlight .p,
.md-typeset .highlight .w     { color: #aab1bd; }                      /* operators / punctuation */

.md-typeset .highlight .nt    { color: #f1c27a; }                      /* tag */
.md-typeset .highlight .err   { color: #ff8a8a; background: transparent; border: none; }
.md-typeset .highlight .l,
.md-typeset .highlight .ld    { color: var(--pk-code-ink); }
.md-typeset .highlight .gh,
.md-typeset .highlight .gu    { color: #d6a6ff; font-weight: 600; }
.md-typeset .highlight .gd    { color: #ff8a8a; }
.md-typeset .highlight .gi    { color: #b6e0a3; }

/* CLI / shell — flag-ish tokens */
.md-typeset .highlight .gp    { color: #6e7785; user-select: none; }   /* prompt */

/* Linenos column (if enabled) */
.md-typeset .highlight .linenos,
.md-typeset .highlight .linenodiv pre { color: var(--pk-code-mute); background: var(--pk-code-bg-2); border-right: 1px solid var(--pk-code-rule); }

/* Inline code accent (sparingly used by Material in headings) */
.md-typeset h1 code,
.md-typeset h2 code,
.md-typeset h3 code,
.md-typeset h4 code {
  background: var(--pk-bg-soft);
  border-color: var(--pk-rule);
  color: var(--pk-accent);
  font-weight: 500;
}

/* =====================================================================
   7. ADMONITIONS
   ===================================================================== */
.md-typeset .admonition,
.md-typeset details {
  font-family: var(--pk-serif);
  font-size: 16px;
  line-height: 1.7;
  color: var(--pk-ink-2);
  background: var(--pk-bg-soft);
  border: none;
  border-left: 3px solid var(--pk-note);
  border-radius: 0 8px 8px 0;
  box-shadow: none;
  margin: 1.75rem 0;
  max-width: 70ch;
  padding: 1rem 1.375rem 1.125rem 1.25rem;
}

.md-typeset .admonition > .admonition-title,
.md-typeset details > summary {
  font-family: var(--pk-sans);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: -0.005em;
  text-transform: none;
  color: var(--pk-note);
  background: transparent;
  border: none;
  padding: 0;
  margin: 0 0 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  line-height: 1.4;
}
.md-typeset .admonition > .admonition-title::before,
.md-typeset details > summary::before {
  content: '' !important;
  display: inline-block !important;
  flex: 0 0 auto;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: currentColor !important;
  -webkit-mask: none !important;
          mask: none !important;
  margin: 0 !important;
  position: static !important;
}
/* Force serif on EVERYTHING inside an admonition except the title — Material
   sets a sans rule with high specificity that we have to beat with !important. */
.md-typeset .admonition,
.md-typeset .admonition p,
.md-typeset .admonition li,
.md-typeset .admonition ul,
.md-typeset .admonition ol,
.md-typeset .admonition blockquote,
.md-typeset details,
.md-typeset details p,
.md-typeset details li,
.md-typeset details ul,
.md-typeset details ol,
.md-typeset details blockquote {
  font-family: var(--pk-serif) !important;
}
.md-typeset .admonition > p,
.md-typeset details > p {
  padding: 0;
  margin: 0;
  max-width: none;
  font-size: 16px;
  line-height: 1.68;
  color: var(--pk-ink-2);
}
.md-typeset .admonition > p + p { margin-top: 0.5rem; }
.md-typeset .admonition > ul,
.md-typeset details > ul,
.md-typeset .admonition > ol,
.md-typeset details > ol { margin: 0.5rem 0 0; padding-left: 1.25rem; }
.md-typeset .admonition code,
.md-typeset details code { font-size: 0.92em; }

/* Tip / success */
.md-typeset .admonition.tip,
.md-typeset details.tip,
.md-typeset .admonition.success,
.md-typeset details.success,
.md-typeset .admonition.hint,
.md-typeset details.hint { border-left-color: var(--pk-tip); }
.md-typeset .tip > .admonition-title, .md-typeset .tip > summary,
.md-typeset .success > .admonition-title, .md-typeset .success > summary,
.md-typeset .hint > .admonition-title, .md-typeset .hint > summary { color: var(--pk-tip); }

/* Warning / danger */
.md-typeset .admonition.warning,
.md-typeset details.warning,
.md-typeset .admonition.danger,
.md-typeset details.danger,
.md-typeset .admonition.caution,
.md-typeset details.caution { border-left-color: var(--pk-warn); }
.md-typeset .warning > .admonition-title, .md-typeset .warning > summary,
.md-typeset .danger > .admonition-title, .md-typeset .danger > summary,
.md-typeset .caution > .admonition-title, .md-typeset .caution > summary { color: var(--pk-warn); }

/* Custom: physics & fortran */
.md-typeset .admonition.physics, .md-typeset details.physics { border-left-color: var(--pk-physics); }
.md-typeset .physics > .admonition-title, .md-typeset .physics > summary { color: var(--pk-physics); }

.md-typeset .admonition.fortran, .md-typeset details.fortran { border-left-color: var(--pk-warn); }
.md-typeset .fortran > .admonition-title, .md-typeset .fortran > summary { color: var(--pk-warn); }

/* =====================================================================
   8. TABLES
   ===================================================================== */
.md-typeset table:not([class]) {
  font-family: var(--pk-sans);
  font-size: 13.5px;
  border: 1px solid var(--pk-rule);
  border-radius: 8px;
  border-collapse: separate;
  border-spacing: 0;
  overflow: hidden;
  margin: 1.25rem 0 1.75rem;
  box-shadow: none;
}

.md-typeset table:not([class]) th {
  text-align: left;
  font-weight: 600;
  font-size: 11.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--pk-muted);
  padding: 0.625rem 0.875rem;
  background: var(--pk-bg-soft);
  border-bottom: 1px solid var(--pk-rule);
}
.md-typeset table:not([class]) td {
  padding: 0.625rem 0.875rem;
  border-top: 1px solid var(--pk-rule-2);
  color: var(--pk-ink-2);
  vertical-align: top;
  background: var(--pk-bg);
}
.md-typeset table:not([class]) tbody tr:first-child td { border-top: none; }
.md-typeset table:not([class]) tbody td:first-child {
  color: var(--pk-ink);
  font-weight: 500;
}
.md-typeset table:not([class]) td code { font-size: 12.5px; }
.md-typeset table:not([class]) tr:nth-child(even) td { background: var(--pk-bg-soft); }

/* =====================================================================
   9. TABS (pymdownx.tabbed)
   ===================================================================== */
.md-typeset .tabbed-set {
  border: 1px solid var(--pk-rule);
  border-radius: 10px;
  margin: 1.25rem 0 1.5rem;
  background: var(--pk-surface);
}
.md-typeset .tabbed-labels {
  border-bottom: 1px solid var(--pk-rule);
  background: var(--pk-bg-soft);
  border-radius: 10px 10px 0 0;
}
.md-typeset .tabbed-labels > label {
  font-family: var(--pk-sans);
  font-size: 13px;
  font-weight: 500;
  color: var(--pk-muted);
  padding: 0.625rem 1rem;
  border-bottom: 2px solid transparent;
  transition: color 0.15s var(--pk-ease), border-color 0.15s var(--pk-ease);
}
.md-typeset .tabbed-labels > label:hover { color: var(--pk-ink); }
.md-typeset .tabbed-set > input:checked + label,
.md-typeset .tabbed-labels > label.md-tab__active {
  color: var(--pk-accent);
  border-bottom-color: var(--pk-accent);
  background: transparent;
}
.md-typeset .tabbed-content { padding: 1rem 1.125rem; }

/* =====================================================================
   10. BLOCKQUOTE / HR
   ===================================================================== */
.md-typeset blockquote {
  border-left: 3px solid var(--pk-accent);
  background: var(--pk-accent-soft);
  border-radius: 0 8px 8px 0;
  padding: 0.875rem 1.125rem;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--pk-ink-2);
}
.md-typeset blockquote p { margin: 0; }

.md-typeset hr {
  border: none;
  height: 1px;
  background: var(--pk-rule);
  margin: 2rem 0;
}

/* =====================================================================
   11. FOOTER (prev/next + site)
   ===================================================================== */
.md-footer { background: transparent; color: var(--pk-muted); }
.md-footer-meta { background: var(--pk-bg-sunken); }

.md-footer__inner { padding: 1rem 0; }

.md-footer__link {
  border: 1px solid var(--pk-rule);
  border-radius: 10px;
  background: var(--pk-surface);
  padding: 1rem 1.125rem;
  transition: border-color 0.15s var(--pk-ease);
}
.md-footer__link:hover { border-color: var(--pk-rule-strong); opacity: 1; }
.md-footer__direction {
  font-family: var(--pk-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--pk-muted);
}
.md-footer__title {
  font-family: var(--pk-sans);
  font-size: 14px;
  font-weight: 600;
  color: var(--pk-ink);
  letter-spacing: -0.01em;
}
.md-footer__button { color: var(--pk-ink-2); }
.md-footer-copyright { font-family: var(--pk-sans); font-size: 12.5px; }

/* =====================================================================
   12. HOMEPAGE HERO
   ===================================================================== */
.md-typeset .pk-hero {
  border-bottom: 1px solid var(--pk-rule);
  padding: 3rem 0 2rem;
  margin-bottom: 2.5rem;
  max-width: none;
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
  gap: 3rem;
  align-items: stretch;          /* let the right column match left card height */
}
.md-typeset .pk-hero__main { min-width: 0; }
/* python-markdown wraps the bare <svg> in a <p>, so the SVG isn't a direct
   child of .pk-hero. Make the wrapper transparent to the grid so the SVG
   itself becomes the grid item, then let it span the whole hero width. */
.md-typeset .pk-hero > p:has(> .pk-spectrum) { display: contents; }
.md-typeset .pk-hero .pk-spectrum {
  grid-column: 1 / -1;
  width: 100%;
}
@media (max-width: 1000px) {
  .md-typeset .pk-hero { grid-template-columns: 1fr; gap: 2rem; }
  .md-typeset .pk-hero__aside { order: -1; max-width: 480px; margin: 0 auto; }
}

/* Bob Kurucz interactive ASCII portrait — sits in the right hero column.
   Inherits the paper background; the JS draws ink-toned glyphs directly
   on the page so it visually merges with the hero rather than living in
   a dark inset. */
.md-typeset .pk-hero__aside {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  font-family: var(--pk-sans);
  min-width: 0;
}
.md-typeset .pk-bob {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;                  /* aspect-ratio set by the JS */
  background: transparent;       /* blend with hero paper */
  border: none;
  border-radius: 0;
  box-shadow: none;
  cursor: crosshair;
}
.md-typeset .pk-bob__caption {
  margin-top: 0.875rem;
  font-size: 11.5px;
  font-family: var(--pk-mono);
  color: var(--pk-muted);
  letter-spacing: 0.02em;
  text-align: center;
  max-width: 36ch;
}
.md-typeset .pk-bob__caption a { color: var(--pk-muted); border-bottom: 1px solid transparent; }
.md-typeset .pk-bob__caption a:hover { color: var(--pk-ink); border-bottom-color: var(--pk-rule-strong); }
.md-typeset .pk-hero__eyebrow {
  font-family: var(--pk-mono);
  font-size: 12px;
  color: var(--pk-muted);
  letter-spacing: 0.04em;
  margin-bottom: 1.125rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.md-typeset .pk-hero__eyebrow::before {
  content: '';
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--pk-accent);
}
.md-typeset .pk-hero h1 {
  font-family: var(--pk-sans);
  font-size: clamp(40px, 5.4vw, 52px);
  line-height: 1.04;
  letter-spacing: -0.035em;
  font-weight: 700;
  color: var(--pk-ink);
  margin: 0 0 1.125rem;
  max-width: 18ch;
  text-wrap: balance;
  border: none;
  padding: 0;
}
.md-typeset .pk-hero h1 em {
  font-style: italic;
  font-family: var(--pk-serif);
  font-weight: 500;
  color: var(--pk-accent);
}
.md-typeset .pk-hero__sub {
  font-family: var(--pk-serif);
  font-size: 19px;
  line-height: 1.55;
  color: var(--pk-muted);
  max-width: 56ch;
  margin: 0 0 1.75rem;
}
.md-typeset .pk-hero__cta {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  flex-wrap: wrap;
  margin-bottom: 1.75rem;
}
.md-typeset .pk-hero__cta .md-button {
  font-family: var(--pk-sans);
  font-weight: 500;
  font-size: 14px;
  padding: 0.5625rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--pk-rule-strong);
  background: var(--pk-surface);
  color: var(--pk-ink);
  letter-spacing: -0.005em;
  transition: border-color 0.15s var(--pk-ease), background 0.15s var(--pk-ease);
}
.md-typeset .pk-hero__cta .md-button:hover { border-color: var(--pk-ink-2); background: var(--pk-bg-soft); }
.md-typeset .pk-hero__cta .md-button--primary {
  background: var(--pk-ink);
  color: var(--pk-bg);
  border-color: var(--pk-ink);
}
.md-typeset .pk-hero__cta .md-button--primary:hover { background: var(--pk-ink-2); border-color: var(--pk-ink-2); }
.md-typeset .pk-hero__meta {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-family: var(--pk-mono);
  font-size: 12px;
  color: var(--pk-muted);
  flex-wrap: wrap;
}
.md-typeset .pk-hero__meta b { color: var(--pk-ink); font-weight: 600; }
.md-typeset .pk-hero__meta .dot {
  width: 4px; height: 4px;
  background: var(--pk-faint);
  border-radius: 50%;
  display: inline-block;
}
.md-typeset .pk-byline {
  font-family: var(--pk-sans);
  font-size: 13px;
  color: var(--pk-muted);
  letter-spacing: -0.005em;
  margin: 0.875rem 0 0;
  max-width: 64ch;
}
.md-typeset .pk-byline strong { color: var(--pk-ink); font-weight: 600; }
.md-typeset .pk-byline a { border-bottom: 1px solid transparent; }
.md-typeset .pk-byline a:hover { border-bottom-color: var(--pk-accent); }

.md-typeset .pk-spectrum {
  margin-top: 1.75rem;
  display: block;
  width: 100%;
  height: 80px;
  color: var(--pk-accent);
  opacity: 0.85;
}
/* Section header (numbered rule with title) */
.md-typeset .pk-section-head {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin: 3.5rem 0 1.5rem;
}
.md-typeset .pk-section-head__num {
  font-family: var(--pk-mono);
  font-size: 12px;
  color: var(--pk-muted);
  letter-spacing: 0.04em;
}
.md-typeset .pk-section-head__title {
  font-family: var(--pk-sans);
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--pk-ink);
  margin: 0;
  flex: none;
  border: none;
  padding: 0;
}
.md-typeset .pk-section-head::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--pk-rule);
}

/* Feature grid (replaces grid cards, used on homepage) */
.md-typeset .pk-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  margin: 0 0 3rem;
  border-top: 1px solid var(--pk-rule);
  border-left: 1px solid var(--pk-rule);
  max-width: none;
}
@media (max-width: 800px) { .md-typeset .pk-features { grid-template-columns: 1fr; } }
.md-typeset .pk-feature {
  padding: 1.75rem 1.75rem 2rem;
  border-right: 1px solid var(--pk-rule);
  border-bottom: 1px solid var(--pk-rule);
  background: var(--pk-bg);
  transition: background 0.2s var(--pk-ease);
}
.md-typeset .pk-feature:hover { background: var(--pk-bg-soft); }
.md-typeset .pk-feature__tag {
  font-family: var(--pk-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--pk-muted);
  margin-bottom: 1rem;
  display: block;
}
.md-typeset .pk-feature h3 {
  font-family: var(--pk-sans);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--pk-ink);
  margin: 0 0 0.5rem;
  border: none;
  padding: 0;
}
.md-typeset .pk-feature p {
  font-family: var(--pk-serif);
  font-size: 15.5px;
  line-height: 1.55;
  color: var(--pk-muted);
  margin: 0;
  max-width: 42ch;
}

/* Doc-index grid (homepage navigation) */
.md-typeset .pk-docindex {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border-top: 1px solid var(--pk-rule);
  margin-bottom: 3rem;
  max-width: none;
}
@media (max-width: 800px) { .md-typeset .pk-docindex { grid-template-columns: 1fr; } }
.md-typeset .pk-docindex__cell {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--pk-rule);
}
@media (min-width: 801px) {
  .md-typeset .pk-docindex__cell:nth-child(2n+1) { padding-right: 1.75rem; }
  .md-typeset .pk-docindex__cell:nth-child(2n)   { padding-left: 1.75rem; border-left: 1px solid var(--pk-rule); }
}
.md-typeset .pk-docindex__head {
  display: flex; align-items: center; gap: 0.625rem;
  margin-bottom: 0.625rem;
}
.md-typeset .pk-docindex__num {
  font-family: var(--pk-mono);
  font-size: 11px;
  color: var(--pk-muted);
  width: 24px;
}
.md-typeset .pk-docindex__title {
  font-family: var(--pk-sans);
  font-weight: 600;
  font-size: 16px;
  color: var(--pk-ink);
  letter-spacing: -0.01em;
}
.md-typeset .pk-docindex ul {
  list-style: none;
  padding: 0; margin: 0 0 0 1.5rem;
  max-width: none;
}
.md-typeset .pk-docindex li {
  margin: 0;
  border-top: 1px dashed var(--pk-rule);
}
.md-typeset .pk-docindex li:first-child { border-top: none; }
.md-typeset .pk-docindex a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0;
  font-family: var(--pk-sans);
  font-size: 13.5px;
  font-weight: 450;
  color: var(--pk-ink-2);
  border: none;
}
.md-typeset .pk-docindex a:hover { color: var(--pk-accent); border: none; }
.md-typeset .pk-docindex a::after {
  content: '→';
  font-family: var(--pk-mono);
  font-size: 12px;
  color: var(--pk-faint);
  transition: transform 0.15s var(--pk-ease), color 0.15s var(--pk-ease);
}
.md-typeset .pk-docindex a:hover::after { color: var(--pk-accent); transform: translateX(2px); }

/* Generated figures (gpt-image-2 / matplotlib output) */
.md-typeset figure.pk-figure {
  margin: 1.75rem 0 1.25rem;
  text-align: center;
  max-width: none;
}
.md-typeset figure.pk-figure img {
  display: block;
  max-width: 100%;
  margin: 0 auto 0.625rem;
  border: 1px solid var(--pk-rule);
  border-radius: 12px;
  background: var(--pk-surface);
}
.md-typeset figure.pk-figure p {
  margin: 0;
  max-width: none;
}
.md-typeset figure.pk-figure figcaption {
  display: block;
  text-align: center;
  font-family: var(--pk-serif);
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--pk-ink-2);          /* readable, not muted */
  margin: 0.5rem auto 0;
  max-width: 60ch;
}
.md-typeset figure.pk-figure figcaption strong { color: var(--pk-ink); }
.md-typeset figure.pk-figure figcaption code { font-size: 0.92em; }

/* Legacy paragraph-caption fallback (in case any survived migration) */
.md-typeset .pk-figure-caption,
.md-typeset p.pk-figure-caption,
.md-typeset em.pk-figure-caption {
  display: block;
  text-align: center;
  font-family: var(--pk-serif);
  font-size: 14.5px;
  color: var(--pk-ink-2);
  margin: 0.25rem auto 1.75rem;
  max-width: 60ch;
}

/* Diagram container */
.md-typeset .pk-diagram {
  margin: 1.75rem 0 2rem;
  padding: 1.5rem;
  border: 1px solid var(--pk-rule);
  border-radius: 12px;
  background: var(--pk-bg-soft);
  overflow: hidden;
}
.md-typeset .pk-diagram svg { display: block; width: 100%; height: auto; }

/* Hide default H1 + nav/toc on the homepage when using hide.navigation */
.md-typeset .pk-hero + p { display: none; } /* swallow stray paragraphs */

/* =====================================================================
   13. SCROLLBARS, MISC
   ===================================================================== */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--pk-rule-strong);
  border-radius: 5px;
  border: 2px solid transparent;
  background-clip: padding-box;
}
::-webkit-scrollbar-thumb:hover { background: var(--pk-muted-2); background-clip: padding-box; }

/* =====================================================================
   mkdocstrings — Python reference rendering
   ===================================================================== */
.md-typeset .doc-heading {
  font-family: var(--pk-sans);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--pk-ink);
}
.md-typeset .doc-heading code {
  background: transparent;
  border: none;
  font-weight: 600;
  font-size: 1em;
  color: var(--pk-accent);
  padding: 0;
}

/* Object signature card — clean, compact */
.md-typeset .doc-object {
  margin: 1.5rem 0 2rem;
  border: 1px solid var(--pk-rule);
  border-radius: 10px;
  background: var(--pk-bg);
  padding: 1rem 1.25rem 1.125rem;
}
/* Kill the default heading top-margin / divider when the heading is the
   first child of a doc-object card — that's where the empty space at the
   top of every "func" / "class" block was coming from. */
.md-typeset .doc-object > .doc-heading,
.md-typeset .doc-object > h2:first-child,
.md-typeset .doc-object > h3:first-child,
.md-typeset .doc-object > h4:first-child,
.md-typeset .doc-object > h5:first-child,
.md-typeset .doc-object > h6:first-child {
  margin-top: 0 !important;
  padding-top: 0 !important;
  border-top: none !important;
}
.md-typeset .doc-object > .doc-heading {
  margin-bottom: 0.5rem;
  font-size: 17px;
  line-height: 1.3;
}
.md-typeset .doc-object > .doc-signature,
.md-typeset .doc-object > div.highlight {
  margin-top: 0.375rem;
  margin-bottom: 0.75rem;
}

.md-typeset .doc-symbol {
  font-family: var(--pk-mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--pk-muted);
  border: 1px solid var(--pk-rule);
  border-radius: 4px;
  padding: 1px 6px;
  margin-right: 0.5rem;
  vertical-align: 2px;
  background: var(--pk-bg-soft);
}
.md-typeset .doc-symbol-class    { color: var(--pk-accent); border-color: var(--pk-accent-rule); background: var(--pk-accent-soft); }
.md-typeset .doc-symbol-function { color: var(--pk-tip); border-color: color-mix(in oklab, var(--pk-tip) 30%, var(--pk-rule)); }
.md-typeset .doc-symbol-method   { color: var(--pk-tip); border-color: color-mix(in oklab, var(--pk-tip) 30%, var(--pk-rule)); }
.md-typeset .doc-symbol-attribute,
.md-typeset .doc-symbol-property { color: var(--pk-warn); border-color: color-mix(in oklab, var(--pk-warn) 30%, var(--pk-rule)); }
.md-typeset .doc-symbol-module   { color: var(--pk-physics); border-color: color-mix(in oklab, var(--pk-physics) 30%, var(--pk-rule)); }

/* Signature pre block — wraps under the heading, dark slab */
.md-typeset .doc-signature {
  margin: 0.5rem 0 0.75rem;
}
.md-typeset .doc-signature .highlight,
.md-typeset code.doc-signature {
  margin: 0.5rem 0 0;
  background: var(--pk-code-bg);
  border-color: var(--pk-rule);
  font-size: 12.5px;
  line-height: 1.6;
}

/* Parameter / returns / raises sections — compact tables */
.md-typeset .doc-contents {
  padding: 0;
  border: none;
  margin-top: 0.5rem;
}

.md-typeset .doc-section-title {
  font-family: var(--pk-sans);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--pk-muted);
  margin: 1rem 0 0.375rem;
  border: none;
  padding: 0;
}

.md-typeset .doc-section table {
  width: 100%;
  font-family: var(--pk-sans);
  font-size: 13.5px;
  border-radius: 6px;
  margin: 0.25rem 0 0;
}
.md-typeset .doc-section table th { font-size: 10.5px; padding: 0.5rem 0.75rem; }
.md-typeset .doc-section table td { padding: 0.5rem 0.75rem; }
.md-typeset .doc-section table td:first-child {
  font-family: var(--pk-mono);
  font-weight: 500;
  color: var(--pk-accent);
  white-space: nowrap;
  font-size: 12.5px;
}

/* Children (nested members) */
.md-typeset .doc-children {
  margin-top: 1.25rem;
  padding-left: 0;
  border: none;
}

/* Source footer (when shown) */
.md-typeset .doc-source-link,
.md-typeset details.quote summary { font-family: var(--pk-mono); font-size: 11px; color: var(--pk-muted); }

/* =====================================================================
   MathJax — centre DISPLAY equations across the full content column,
   keep INLINE math inline (never apply block styling to <span> wrappers).
   pymdownx.arithmatex emits:
     - <div class="arithmatex">\[ ... \]</div>   for display math
     - <span class="arithmatex">\( ... \)</span> for inline math
   MathJax 3 then renders each into an <mjx-container> with display="true"
   for block math and no display attribute for inline math.
   ===================================================================== */
.md-typeset .arithmatex { color: var(--pk-ink); }

/* DISPLAY math: block, full-width parent, centred contents.
   These selectors only target the BLOCK form (div.arithmatex / mjx-container[display=true]). */
.md-typeset div.arithmatex {
  display: block;
  width: 100%;
  max-width: 100%;
  margin: 1.25rem 0 1.5rem;
  text-align: center;
  overflow-x: auto;
}
.md-typeset mjx-container[display="true"] {
  display: block !important;
  text-align: center !important;
  margin: 0.5rem auto !important;
  overflow-x: auto;
}
.md-typeset mjx-container[display="true"] > mjx-math {
  display: inline-block !important;
  text-align: left;
}

/* INLINE math: leave the span / non-display container completely alone
   so it flows inside its paragraph. No display:block, no margins, no
   text-align overrides. */
.md-typeset span.arithmatex,
.md-typeset mjx-container:not([display="true"]) {
  display: inline;
}

/* Mermaid containers — frame the rendered diagram */
.md-typeset .mermaid {
  background: var(--pk-bg-soft);
  border: 1px solid var(--pk-rule);
  border-radius: 12px;
  padding: 1.25rem 1.5rem 1rem;
  margin: 1.75rem 0;
  text-align: center;
  overflow-x: auto;
  font-family: var(--pk-sans);
}
/* Tighten mermaid edge label backgrounds to match our paper bg */
.md-typeset .mermaid .edgeLabel,
.md-typeset .mermaid .edgeLabel rect {
  background: var(--pk-bg-soft) !important;
  fill: var(--pk-bg-soft) !important;
}
.md-typeset .mermaid .nodeLabel,
.md-typeset .mermaid .label foreignObject div {
  font-family: var(--pk-sans) !important;
  font-size: 13.5px !important;
  font-weight: 500 !important;
  letter-spacing: -0.005em;
  color: var(--pk-ink) !important;
}
.md-typeset .mermaid .cluster rect {
  fill: var(--pk-bg) !important;
  stroke: var(--pk-rule-strong) !important;
  stroke-dasharray: 0 !important;
  rx: 10px;
  ry: 10px;
}
.md-typeset .mermaid .cluster text,
.md-typeset .mermaid .cluster .nodeLabel {
  font-family: var(--pk-mono) !important;
  font-size: 11px !important;
  font-weight: 600 !important;
  letter-spacing: 0.04em !important;
  text-transform: uppercase !important;
  fill: var(--pk-muted) !important;
  color: var(--pk-muted) !important;
}
.md-typeset .mermaid .node rect,
.md-typeset .mermaid .node circle,
.md-typeset .mermaid .node ellipse,
.md-typeset .mermaid .node polygon {
  rx: 8px;
  ry: 8px;
  stroke-width: 1px !important;
}
.md-typeset .mermaid .flowchart-link {
  stroke: var(--pk-muted) !important;
  stroke-width: 1.25px !important;
  fill: none !important;
}
.md-typeset .mermaid .marker {
  fill: var(--pk-muted) !important;
  stroke: var(--pk-muted) !important;
}

/* Better focus rings */
:focus-visible {
  outline: 2px solid var(--pk-accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Small viewports */
@media (max-width: 76.1875em) {
  .md-typeset .pk-hero h1 { font-size: clamp(32px, 8vw, 44px); }
  .md-typeset .pk-section-head { margin: 2.5rem 0 1.25rem; }
}