/* Outbreak Science — clean, bold professional theme */

@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@400;500;600;700&family=Sora:wght@500;600;700;800&display=swap");

:root {
  /* Brand palette — deep ink + teal */
  --os-ink: #0b1f2a;
  --os-ink-soft: #1a3340;
  --os-teal: #0d7377;
  --os-teal-bright: #14919b;
  --os-teal-muted: #0d73771a;
  --os-surface: #f4f7f8;
  --os-surface-raised: #ffffff;
  --os-border: #d5e0e6;
  --os-muted: #5a6b73;
  --os-code-bg: #eef3f5;

  --pst-font-family-base: "IBM Plex Sans", "Helvetica Neue", Arial, sans-serif;
  --pst-font-family-heading: "Sora", "IBM Plex Sans", system-ui, sans-serif;
  --pst-font-family-monospace: "IBM Plex Mono", "SF Mono", ui-monospace, Menlo, monospace;

  --pst-font-size-base: 1.05rem;
  --pst-font-weight-heading: 700;
  --pst-font-size-h1: 2.15rem;
  --pst-font-size-h2: 1.55rem;
  --pst-font-size-h3: 1.25rem;
  --pst-font-size-h4: 1.1rem;

  --pst-sidebar-font-size: 0.92rem;
  --pst-sidebar-font-weight: 500;
  --pst-sidebar-header-font-size: 0.75rem;
}

/* Theme tokens must live on html[data-theme] — :root is overridden by pydata-sphinx-theme */
html[data-theme="light"],
html:not([data-theme]) {
  --os-ink: #0b1f2a;
  --os-ink-soft: #1a3340;
  --os-teal: #0d7377;
  --os-teal-bright: #14919b;
  --os-teal-muted: #0d73771a;
  --os-surface: #f4f7f8;
  --os-surface-raised: #ffffff;
  --os-border: #d5e0e6;
  --os-muted: #5a6b73;
  --os-code-bg: #eef3f5;

  --pst-color-primary: #0d7377;
  --pst-color-primary-highlight: #14919b;
  --pst-color-secondary: #0b1f2a;
  --pst-color-accent: #0d7377;
  --pst-color-info: #0d7377;
  --pst-color-link: #0d7377;
  --pst-color-link-hover: #0b1f2a;
  --pst-color-text-base: #1a2c34;
  --pst-color-text-muted: #5a6b73;
  --pst-color-inline-code-links: #0d7377;
  --pst-color-secondary-highlight: #1a3340;
}

html[data-theme="dark"] {
  --os-ink: #e8eef1;
  --os-ink-soft: #c5d0d6;
  --os-teal: #2dd4bf;
  --os-teal-bright: #5eead4;
  --os-teal-muted: #2dd4bf22;
  --os-surface: #0d1519;
  --os-surface-raised: #152028;
  --os-border: #2a3a44;
  --os-muted: #8a9ba4;
  --os-code-bg: #1a262e;

  --pst-color-primary: #2dd4bf;
  --pst-color-primary-highlight: #5eead4;
  --pst-color-secondary: #e8eef1;
  --pst-color-accent: #2dd4bf;
  --pst-color-info: #2dd4bf;
  --pst-color-link: #2dd4bf;
  --pst-color-link-hover: #5eead4;
  --pst-color-text-base: #e8eef1;
  --pst-color-text-muted: #8a9ba4;
  --pst-color-inline-code-links: #2dd4bf;
  --pst-color-secondary-highlight: #c5d0d6;
}

/* ------------------------------------------------------------------ */
/* Page shell                                                          */
/* ------------------------------------------------------------------ */

body {
  background:
    radial-gradient(1200px 600px at 0% -10%, rgba(13, 115, 119, 0.07), transparent 55%),
    radial-gradient(900px 500px at 100% 0%, rgba(11, 31, 42, 0.05), transparent 50%),
    var(--os-surface);
  color: var(--pst-color-text-base);
  font-family: var(--pst-font-family-base);
  font-weight: 400;
  letter-spacing: 0.01em;
}

.bd-container {
  background: transparent;
}

/* Comfortable reading width */
.bd-main .bd-content .bd-article-container {
  max-width: 52rem;
}

.bd-main .bd-content {
  padding-top: 1.75rem;
}

.bd-article {
  background: var(--os-surface-raised);
  border: 1px solid var(--os-border);
  border-radius: 2px;
  padding: 2rem 2.25rem 2.5rem;
  box-shadow: 0 1px 0 rgba(11, 31, 42, 0.04);
}

@media (max-width: 768px) {
  .bd-article {
    padding: 1.25rem 1rem 1.75rem;
    border-left: none;
    border-right: none;
    border-radius: 0;
  }
}

/* ------------------------------------------------------------------ */
/* Typography                                                          */
/* ------------------------------------------------------------------ */

h1,
h2,
h3,
h4,
h5,
h6,
.bd-article-container h1,
.bd-article-container h2,
.bd-article-container h3 {
  font-family: var(--pst-font-family-heading);
  font-weight: 700;
  color: var(--os-ink);
  letter-spacing: -0.03em;
  line-height: 1.2;
}

h1,
.bd-article-container h1 {
  font-size: var(--pst-font-size-h1);
  font-weight: 800;
  margin-bottom: 1.35rem;
  padding-bottom: 0.85rem;
  border-bottom: 3px solid var(--os-teal);
}

h2,
.bd-article-container h2 {
  font-size: var(--pst-font-size-h2);
  margin-top: 2.75rem;
  margin-bottom: 0.9rem;
  padding-left: 0.85rem;
  border-left: 4px solid var(--os-teal);
}

h3,
.bd-article-container h3 {
  font-size: var(--pst-font-size-h3);
  margin-top: 2rem;
  margin-bottom: 0.65rem;
  color: var(--os-ink-soft);
}

.bd-article-container p,
.bd-article-container li {
  line-height: 1.75;
  font-size: 1.02rem;
}

.bd-article-container p {
  margin-bottom: 1.1rem;
}

/* Lead paragraph on intro / chapter openers */
.bd-article > section > p:first-of-type {
  font-size: 1.12rem;
  font-weight: 500;
  color: var(--os-ink-soft);
  line-height: 1.7;
  max-width: 42em;
}

strong,
b {
  font-weight: 700;
  color: var(--os-ink);
}

a,
.bd-article a,
.bd-content a {
  color: var(--os-teal) !important;
  font-weight: 600;
  text-decoration-thickness: 1.5px;
  text-underline-offset: 0.18em;
}

a:hover,
.bd-article a:hover,
.bd-content a:hover {
  color: var(--os-ink) !important;
  text-decoration-thickness: 2px;
}

/* TOC / sidebar nav keep their own link treatment */
.bd-sidebar-primary a,
nav.bd-toc a,
.bd-header a {
  text-decoration: none;
}

/* ------------------------------------------------------------------ */
/* Navbar & brand                                                      */
/* ------------------------------------------------------------------ */

.bd-header {
  background: var(--os-surface-raised) !important;
  border-bottom: 1px solid var(--os-border) !important;
  box-shadow: none;
}

.navbar-brand {
  font-family: var(--pst-font-family-heading);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--os-ink) !important;
  gap: 0.65rem;
}

.navbar-brand .logo__title,
.navbar-brand p,
.navbar-brand span {
  color: var(--os-ink) !important;
  font-weight: 700;
  font-size: 1.05rem;
}

.navbar-brand img {
  max-height: 2.15rem;
}

/* Sidebar brand block */
.bd-sidebar-primary .navbar-brand {
  display: flex;
  align-items: center;
  padding: 1rem 0.85rem;
  margin: 0.35rem 0.5rem 1rem;
  background: var(--os-surface-raised);
  border: 1px solid var(--os-border);
  border-radius: 2px;
  color: var(--os-ink) !important;
}

.bd-sidebar-primary .navbar-brand .logo__title,
.bd-sidebar-primary .navbar-brand p,
.bd-sidebar-primary .navbar-brand span {
  color: var(--os-ink) !important;
}

.bd-sidebar-primary .navbar-brand img {
  max-height: 1.75rem;
}

html[data-theme="dark"] .bd-sidebar-primary .navbar-brand {
  background: var(--os-teal-muted);
  border: 1px solid var(--os-teal);
}

html[data-theme="dark"] .bd-sidebar-primary .navbar-brand .logo__title,
html[data-theme="dark"] .bd-sidebar-primary .navbar-brand p,
html[data-theme="dark"] .bd-sidebar-primary .navbar-brand span {
  color: var(--os-ink) !important;
}

/* Search / icon buttons in header */
.bd-header .btn,
.bd-header button {
  border-radius: 2px;
}

.bd-header .btn:hover {
  color: var(--os-teal) !important;
}

/* ------------------------------------------------------------------ */
/* Sidebar                                                             */
/* ------------------------------------------------------------------ */

.bd-sidebar-primary {
  background: var(--os-surface-raised) !important;
  border-right: 1px solid var(--os-border) !important;
}

.bd-sidebar-primary .sidebar-header-items,
.bd-sidebar-primary .sidebar-primary-items__start {
  padding-top: 0.5rem;
}

.bd-sidebar-primary .bd-links {
  font-family: var(--pst-font-family-base);
  font-size: 0.9rem;
}

.bd-sidebar-primary label.nav-header,
.bd-sidebar-primary .caption,
.bd-sidebar-primary p.caption {
  font-family: var(--pst-font-family-heading);
  font-weight: 700;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--os-muted);
}

.bd-sidebar-primary .nav-link {
  border-radius: 2px;
  padding: 0.4rem 0.65rem;
  color: var(--os-ink-soft);
  font-weight: 500;
  border-left: 3px solid transparent;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.bd-sidebar-primary .nav-link:hover {
  background: var(--os-teal-muted);
  color: var(--os-ink);
  border-left-color: var(--os-teal-bright);
}

.bd-sidebar-primary .nav-link.active,
.bd-sidebar-primary .nav-item.active > .nav-link,
.bd-sidebar-primary .current > .nav-link {
  background: var(--os-teal-muted);
  color: var(--os-teal) !important;
  font-weight: 700;
  border-left-color: var(--os-teal);
}

/* On-this-page TOC */
nav.bd-toc {
  border-left: 1px solid var(--os-border);
}

nav.bd-toc .onthispage {
  font-family: var(--pst-font-family-heading);
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--os-muted);
}

nav.bd-toc .nav-link {
  font-size: 0.85rem;
  border-left: 2px solid transparent;
  padding-left: 0.75rem;
}

nav.bd-toc .nav-link.active {
  font-weight: 700;
  color: var(--os-teal) !important;
  border-left-color: var(--os-teal);
}

/* ------------------------------------------------------------------ */
/* Admonitions                                                         */
/* ------------------------------------------------------------------ */

.admonition,
div.admonition {
  border-radius: 2px;
  border: 1px solid var(--os-border);
  border-left: 4px solid var(--os-teal);
  background: var(--os-surface);
  box-shadow: none;
  margin: 1.75rem 0;
}

.admonition-title,
div.admonition > .admonition-title {
  font-family: var(--pst-font-family-heading);
  font-weight: 700;
  letter-spacing: -0.01em;
  background: var(--os-teal-muted) !important;
}

.admonition.note,
.admonition.tip,
.admonition.hint,
.admonition.important {
  border-left-color: var(--os-teal);
}

.admonition.warning,
.admonition.caution,
.admonition.attention {
  border-left-color: #c27803;
}

.admonition.danger,
.admonition.error {
  border-left-color: #c0392b;
}

/* ------------------------------------------------------------------ */
/* Code & notebooks                                                    */
/* ------------------------------------------------------------------ */

code {
  font-size: 0.88em;
  font-weight: 500;
  padding: 0.12em 0.38em;
  border-radius: 2px;
  background: var(--os-code-bg);
  color: var(--os-ink);
}

div.highlight,
pre {
  border-radius: 2px;
  border: 1px solid var(--os-border);
  font-size: 0.88em;
}

div.cell {
  margin: 1.5rem 0;
}

div.cell_input,
div.cell_output {
  border-radius: 2px;
  margin: 0.65rem 0;
}

div.cell_input {
  border: 1px solid var(--os-border);
  border-left: 3px solid var(--os-ink);
}

div.cell_output {
  border-left: 3px solid var(--os-teal);
}

/* ------------------------------------------------------------------ */
/* Figures, tables, math                                               */
/* ------------------------------------------------------------------ */

figure {
  margin: 2.25rem auto;
}

figure img,
.bd-article img {
  border-radius: 2px;
}

figcaption,
.caption {
  font-size: 0.9rem;
  color: var(--os-muted);
  font-weight: 500;
  margin-top: 0.65rem;
}

table.table,
.bd-article table {
  margin: 1.75rem 0;
  font-size: 0.95em;
  border-collapse: collapse;
  width: 100%;
}

.bd-article table thead th {
  font-family: var(--pst-font-family-heading);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: var(--os-ink);
  color: #fff;
  border: none;
  padding: 0.7rem 0.85rem;
}

.bd-article table tbody td {
  padding: 0.65rem 0.85rem;
  border-bottom: 1px solid var(--os-border);
}

.bd-article table tbody tr:hover {
  background: var(--os-teal-muted);
}

/* Display math only — do not target span.math (inline) */
div.math,
div.amsmath.math {
  margin: 0.85rem 0;
  overflow-x: auto;
}

span.math {
  margin: 0;
}

mjx-container[display="true"] {
  margin: 0.85rem 0 !important;
}

mjx-container:not([display="true"]) {
  margin: 0 !important;
}

/* ------------------------------------------------------------------ */
/* Prev / next & footer                                                */
/* ------------------------------------------------------------------ */

.prev-next-area a {
  border-radius: 2px;
  border: 1px solid var(--os-border);
  padding: 0.85rem 1rem;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.prev-next-area a:hover {
  border-color: var(--os-teal);
  background: var(--os-teal-muted);
  text-decoration: none;
}

.prev-next-area .prev-next-title {
  font-family: var(--pst-font-family-heading);
  font-weight: 700;
  color: var(--os-ink);
}

.bd-footer {
  background: var(--os-ink) !important;
  color: rgba(255, 255, 255, 0.75);
  border-top: none;
}

.bd-footer a {
  color: #fff;
}

/* Back to top */
#pst-back-to-top {
  background: var(--os-teal) !important;
  border-radius: 2px !important;
  font-family: var(--pst-font-family-heading);
  font-weight: 700;
  letter-spacing: 0.02em;
}

/* ------------------------------------------------------------------ */
/* Misc polish                                                         */
/* ------------------------------------------------------------------ */

hr {
  border: none;
  border-top: 2px solid var(--os-border);
  margin: 2.5rem 0;
}

blockquote {
  border-left: 4px solid var(--os-teal);
  background: var(--os-teal-muted);
  margin: 1.5rem 0;
  padding: 0.85rem 1.15rem;
  color: var(--os-ink-soft);
  font-weight: 500;
}

/* Sphinx design cards / grids if used */
.sd-card {
  border-radius: 2px;
  border: 1px solid var(--os-border);
  box-shadow: none;
}

.sd-card:hover {
  border-color: var(--os-teal);
}

.sd-card-header {
  font-family: var(--pst-font-family-heading);
  font-weight: 700;
  background: var(--os-surface);
  border-bottom: 1px solid var(--os-border);
}

/* Table of contents list on intro */
.bd-article .toctree-wrapper ul {
  list-style: none;
  padding-left: 0;
  margin: 1.25rem 0 0;
}

.bd-article .toctree-wrapper li {
  margin: 0;
  border-bottom: 1px solid var(--os-border);
}

.bd-article .toctree-wrapper li > a {
  display: block;
  padding: 0.7rem 0.85rem;
  text-decoration: none !important;
  font-weight: 600;
  border-left: 3px solid transparent;
  transition: background 0.15s ease, border-color 0.15s ease, padding-left 0.15s ease;
}

.bd-article .toctree-wrapper li > a:hover {
  background: var(--os-teal-muted);
  border-left-color: var(--os-teal);
  padding-left: 1.1rem;
  color: var(--os-ink) !important;
}

/* Search results */
.search li {
  border-bottom: 1px solid var(--os-border);
  padding: 0.85rem 0;
}

/* ------------------------------------------------------------------ */
/* Live Code (Thebe) button                                            */
/* ------------------------------------------------------------------ */

button.thebe-launch-button,
.thebelab-button {
  font-family: var(--pst-font-family-heading);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: var(--os-teal) !important;
  color: #fff !important;
  border: none !important;
  border-radius: 2px;
  padding: 0.55rem 1rem;
  margin: 0 0 1.25rem;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.15s ease;
}

button.thebe-launch-button:hover,
.thebelab-button:hover {
  background: var(--os-ink) !important;
}