/* ==========================================================================
   openstage MkDocs Theme
   Single-file CSS: layout, navigation, TOC, search, typography, dark mode, responsive
   All configurability via --os-* custom properties (injected from mkdocs.yml)
   ========================================================================== */

/* --------------------------------------------------------------------------
   Custom properties (defaults; overridden by inline style in base.html)
   -------------------------------------------------------------------------- */
:root {
  --os-font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --os-font-code: "JetBrains Mono", "Fira Code", "Consolas", monospace;
  --os-font-size: 16px;
  --os-content-max-width: 48rem;
  --os-sidebar-width: 18rem;
  --os-toc-width: 14rem;
  --os-primary: #1a73e8;
  --os-accent: #1a73e8;

  /* Derived / internal variables */
  --os-bg: #ffffff;
  --os-bg-sidebar: #f8f9fa;
  --os-bg-code: #f5f5f5;
  --os-text: #24292e;
  --os-text-muted: #6a737d;
  --os-border: #e1e4e8;
  --os-link: var(--os-primary);
  --os-nav-active-bg: rgba(26, 115, 232, 0.08);
  --os-nav-active-border: var(--os-primary);
  --os-toc-active: var(--os-primary);
  --os-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  --os-header-height: 3rem;
}

/* --------------------------------------------------------------------------
   Dark mode
   -------------------------------------------------------------------------- */
[data-color-mode="dark"] {
  --os-bg: #1e1e1e;
  --os-bg-sidebar: #252526;
  --os-bg-code: #2d2d2d;
  --os-text: #d4d4d4;
  --os-text-muted: #8b949e;
  --os-border: #30363d;
  --os-nav-active-bg: rgba(26, 115, 232, 0.15);
  --os-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

/* --------------------------------------------------------------------------
   Reset / base
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-size: var(--os-font-size);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--os-font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--os-text);
  background: var(--os-bg);
  -webkit-font-smoothing: antialiased;
}

/* --------------------------------------------------------------------------
   Layout: CSS Grid
   -------------------------------------------------------------------------- */
.os-layout {
  display: grid;
  grid-template-columns: var(--os-sidebar-width) 1fr;
  min-height: 100vh;
}

.os-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--os-sidebar-width);
  background: var(--os-bg-sidebar);
  border-right: 1px solid var(--os-border);
  overflow: hidden;
  z-index: 100;
  transition: transform 0.25s ease;
  display: flex;
  flex-direction: column;
}

.os-sidebar-inner {
  display: flex;
  flex-direction: column;
  padding: 1.25rem 0;
  flex: 1;
  min-height: 0;
}

.os-main {
  grid-column: 2;
  min-width: 0;
}

.os-content-area {
  display: flex;
  max-width: calc(var(--os-content-max-width) + var(--os-toc-width) + 4rem);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.os-content {
  flex: 1;
  min-width: 0;
  max-width: var(--os-content-max-width);
  padding: 2rem 0;
}

/* --------------------------------------------------------------------------
   Sidebar header (logo / site title)
   -------------------------------------------------------------------------- */
.os-sidebar-header {
  padding: 0 1.25rem 1rem;
  border-bottom: 1px solid var(--os-border);
  margin-bottom: 0.75rem;
}

.os-site-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--os-text);
  text-decoration: none;
  display: block;
}

.os-site-title:hover {
  color: var(--os-primary);
}

.os-logo img {
  max-width: 100%;
  max-height: 2.5rem;
}

/* Sidebar without dividers */
.os-sidebar--no-dividers .os-sidebar-header {
  border-bottom: none;
}

.os-sidebar--no-dividers .os-search {
  border-bottom: none;
}

.os-sidebar--no-dividers .os-sidebar-footer {
  border-top: none;
}

/* --------------------------------------------------------------------------
   Search
   -------------------------------------------------------------------------- */
.os-search {
  padding: 0.5rem 1.25rem 0.75rem;
  border-bottom: 1px solid var(--os-border);
  margin-bottom: 0.5rem;
}

.os-search-input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.os-search-icon {
  position: absolute;
  left: 0.6rem;
  color: var(--os-text-muted);
  pointer-events: none;
}

.os-search-input {
  width: 100%;
  padding: 0.4rem 0.5rem 0.4rem 2rem;
  border: 1px solid var(--os-border);
  border-radius: 4px;
  background: var(--os-bg);
  color: var(--os-text);
  font-family: var(--os-font-body);
  font-size: 0.85rem;
  outline: none;
  transition: border-color 0.15s;
}

.os-search-input:focus {
  border-color: var(--os-primary);
}

.os-search-results {
  margin-top: 0.5rem;
  max-height: 60vh;
  overflow-y: auto;
}

.os-search-results.os-search-results--hidden {
  display: none;
}

.os-search-results article {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--os-border);
}

.os-search-results article h3 {
  margin: 0 0 0.25rem;
  font-size: 0.85rem;
  font-weight: 600;
}

.os-search-results article h3 a {
  color: var(--os-primary);
  text-decoration: none;
}

.os-search-results article p {
  margin: 0;
  font-size: 0.8rem;
  color: var(--os-text-muted);
}

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */
.os-nav {
  flex: 1;
  overflow-y: auto;
  padding: 0 0.75rem;
}

.os-nav-list,
.os-nav-list ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.os-nav-list ul {
  padding-left: 0.75rem;
}

.os-nav-item a,
.os-nav-toggle {
  display: flex;
  align-items: center;
  width: 100%;
  padding: 0.35rem 0.5rem;
  border: none;
  border-radius: 4px;
  background: none;
  color: var(--os-text);
  font-family: var(--os-font-body);
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  text-align: left;
  line-height: 1.4;
}

.os-nav-item a:hover,
.os-nav-toggle:hover {
  background: var(--os-nav-active-bg);
}

.os-nav-item--active > a {
  background: var(--os-nav-active-bg);
  color: var(--os-primary);
  font-weight: 500;
  border-left: 2px solid var(--os-nav-active-border);
  padding-left: calc(0.5rem - 2px);
}

.os-nav-toggle {
  justify-content: space-between;
  font-weight: 500;
}

.os-nav-toggle span {
  flex: 1;
}

.os-nav-arrow {
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.os-nav-toggle[aria-expanded="true"] .os-nav-arrow {
  transform: rotate(90deg);
}

.os-nav-section--active > .os-nav-toggle {
  color: var(--os-primary);
}

/* --------------------------------------------------------------------------
   Table of Contents (right sidebar)
   -------------------------------------------------------------------------- */
.os-toc {
  width: var(--os-toc-width);
  flex-shrink: 0;
  padding-left: 2rem;
  padding-top: 2rem;
}

.os-toc-inner {
  position: sticky;
  top: 2rem;
  max-height: calc(100vh - 3rem);
  overflow-y: auto;
  padding-left: 1rem;
  border-left: 1px solid var(--os-border);
}

.os-toc-title {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--os-text-muted);
  margin-bottom: 0.5rem;
}

.os-toc-list,
.os-toc-list ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.os-toc-list ul {
  padding-left: 0.75rem;
}

.os-toc-link {
  display: block;
  padding: 0.2rem 0;
  font-size: 0.8rem;
  color: var(--os-text-muted);
  text-decoration: none;
  line-height: 1.4;
  transition: color 0.15s;
}

.os-toc-link:hover {
  color: var(--os-text);
}

.os-toc-link.os-toc-link--active {
  color: var(--os-toc-active);
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   Sidebar footer (color toggle, nav links)
   -------------------------------------------------------------------------- */
.os-sidebar-footer {
  margin-top: auto;
  padding: 0.75rem 1.25rem;
  border-top: 1px solid var(--os-border);
}

.os-nav-links {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  margin-bottom: 0.5rem;
}

.os-nav-link {
  display: block;
  padding: 0.3rem 0.5rem;
  font-size: 0.825rem;
  color: var(--os-text-muted);
  text-decoration: none;
  border-radius: 4px;
}

.os-nav-link:hover {
  color: var(--os-text);
  background: var(--os-nav-active-bg);
}

.os-sidebar-footer .os-color-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.3rem 0.5rem;
  border: none;
  background: none;
  color: var(--os-text-muted);
  font-family: var(--os-font-body);
  font-size: 0.825rem;
  cursor: pointer;
  border-radius: 4px;
}

.os-sidebar-footer .os-color-toggle:hover {
  color: var(--os-text);
  background: var(--os-nav-active-bg);
}

.os-color-label {
  display: inline;
}

/* --------------------------------------------------------------------------
   Header (mobile)
   -------------------------------------------------------------------------- */
.os-header {
  display: none;
  position: sticky;
  top: 0;
  z-index: 90;
  height: var(--os-header-height);
  padding: 0 1rem;
  background: var(--os-bg);
  border-bottom: 1px solid var(--os-border);
  align-items: center;
  gap: 0.75rem;
}

.os-sidebar-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.25rem;
  border: none;
  background: none;
  color: var(--os-text);
  cursor: pointer;
  border-radius: 4px;
}

.os-sidebar-toggle:hover {
  background: var(--os-nav-active-bg);
}

.os-header-title {
  flex: 1;
  font-weight: 600;
  font-size: 0.95rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Color toggle icon switching */
[data-color-mode="light"] .os-icon-moon,
[data-color-mode="auto"] .os-icon-moon {
  display: none;
}

[data-color-mode="dark"] .os-icon-sun {
  display: none;
}

/* --------------------------------------------------------------------------
   Footer (prev/next navigation)
   -------------------------------------------------------------------------- */
.os-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--os-border);
}

.os-footer-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.os-footer-link {
  display: flex;
  flex-direction: column;
  padding: 0.75rem 1rem;
  border: 1px solid var(--os-border);
  border-radius: 6px;
  text-decoration: none;
  transition: border-color 0.15s;
  max-width: 50%;
}

.os-footer-link:hover {
  border-color: var(--os-primary);
}

.os-footer-link--next {
  margin-left: auto;
  text-align: right;
}

.os-footer-label {
  font-size: 0.75rem;
  color: var(--os-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.os-footer-title {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--os-primary);
}

.os-copyright {
  margin-top: 1.5rem;
  padding-bottom: 1.5rem;
  font-size: 0.8rem;
  color: var(--os-text-muted);
}

.os-copyright p {
  margin: 0;
}

.os-site-footer {
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--os-border);
  font-size: 0.75rem;
  color: var(--os-text-muted);
}

.os-site-footer p {
  margin: 0;
}

/* --------------------------------------------------------------------------
   Overlay (mobile sidebar backdrop)
   -------------------------------------------------------------------------- */
.os-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 99;
}

.os-overlay.os-overlay--visible {
  display: block;
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
.os-content h1,
.os-content h2,
.os-content h3,
.os-content h4,
.os-content h5,
.os-content h6 {
  margin-top: 1.5em;
  margin-bottom: 0.5em;
  font-weight: 600;
  line-height: 1.3;
}

.os-content .headerlink {
  visibility: hidden;
  margin-left: 0.25em;
  color: var(--os-text-muted);
  text-decoration: none;
  font-weight: 400;
}

.os-content h1:hover .headerlink,
.os-content h2:hover .headerlink,
.os-content h3:hover .headerlink,
.os-content h4:hover .headerlink,
.os-content h5:hover .headerlink,
.os-content h6:hover .headerlink {
  visibility: visible;
}

.os-content h1 { font-size: 2rem; margin-top: 0; }
.os-content h2 { font-size: 1.5rem; padding-bottom: 0.3em; border-bottom: 1px solid var(--os-border); }
.os-content h3 { font-size: 1.25rem; }
.os-content h4 { font-size: 1rem; }

.os-content p {
  margin: 0 0 1em;
}

.os-content a {
  color: var(--os-link);
  text-decoration: none;
}

.os-content a:hover {
  text-decoration: underline;
}

.os-content code {
  font-family: var(--os-font-code);
  font-size: 0.875em;
  padding: 0.15em 0.35em;
  background: var(--os-bg-code);
  border-radius: 3px;
}

.os-content pre {
  margin: 0 0 1em;
  padding: 1rem;
  background: var(--os-bg-code);
  border-radius: 6px;
  overflow-x: auto;
  line-height: 1.5;
}

.os-content pre code {
  padding: 0;
  background: none;
  font-size: 0.85rem;
}

.os-content blockquote {
  margin: 0 0 1em;
  padding: 0.5rem 1rem;
  border-left: 3px solid var(--os-primary);
  color: var(--os-text-muted);
  background: var(--os-bg-code);
  border-radius: 0 4px 4px 0;
}

.os-content blockquote p:last-child {
  margin-bottom: 0;
}

.os-content img {
  max-width: 100%;
  height: auto;
}

.os-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1em;
  font-size: 0.9rem;
}

.os-content th,
.os-content td {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--os-border);
  text-align: left;
}

.os-content th {
  background: var(--os-bg-code);
  font-weight: 600;
}

.os-content ul,
.os-content ol {
  margin: 0 0 1em;
  padding-left: 1.5em;
}

.os-content li {
  margin-bottom: 0.25em;
}

.os-content hr {
  border: none;
  border-top: 1px solid var(--os-border);
  margin: 2em 0;
}

/* --------------------------------------------------------------------------
   Admonitions (simple support for MkDocs admonition extension)
   -------------------------------------------------------------------------- */
.os-content .admonition {
  margin: 1em 0;
  padding: 0.75rem 1rem;
  border-left: 3px solid var(--os-primary);
  background: var(--os-bg-code);
  border-radius: 0 4px 4px 0;
}

.os-content .admonition-title {
  font-weight: 600;
  margin-bottom: 0.25em;
}

/* --------------------------------------------------------------------------
   Subsite bar (back-link at top of sidebar)
   -------------------------------------------------------------------------- */
.os-subsite-bar {
  padding: 0.5rem 1.25rem;
  background: var(--os-primary);
  flex-shrink: 0;
}

.os-subsite-link {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: #fff;
  text-decoration: none;
  font-size: 0.8rem;
  opacity: 0.9;
  transition: opacity 0.15s;
}

.os-subsite-link:hover {
  opacity: 1;
}

.os-subsite-logo {
  height: 1rem;
  width: auto;
}

/* --------------------------------------------------------------------------
   Announcement bar
   -------------------------------------------------------------------------- */
.os-announce {
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
  text-align: center;
  border-bottom: 1px solid;
}

.os-announce-inner {
  max-width: var(--os-content-max-width);
  margin: 0 auto;
}

.os-announce a {
  color: inherit;
  text-decoration: underline;
}

.os-announce--info {
  background: #e8f0fe;
  color: #1a4d8f;
  border-color: #c5d9f2;
}

.os-announce--warning {
  background: #fef7e0;
  color: #7a5900;
  border-color: #f5e6a3;
}

.os-announce--danger {
  background: #fce8e6;
  color: #8b1a1a;
  border-color: #f5c6c2;
}

.os-announce--success {
  background: #e6f4ea;
  color: #1a6b3c;
  border-color: #b7dfca;
}

[data-color-mode="dark"] .os-announce--info {
  background: #1a2a3e;
  color: #90b8f8;
  border-color: #2a3e5e;
}

[data-color-mode="dark"] .os-announce--warning {
  background: #3a2e10;
  color: #f0c860;
  border-color: #4e3e18;
}

[data-color-mode="dark"] .os-announce--danger {
  background: #3a1818;
  color: #f09090;
  border-color: #4e2020;
}

[data-color-mode="dark"] .os-announce--success {
  background: #1a2e20;
  color: #70d090;
  border-color: #204028;
}

/* --------------------------------------------------------------------------
   Responsive: TOC hides below 1100px
   -------------------------------------------------------------------------- */
@media (max-width: 1100px) {
  .os-toc {
    display: none;
  }
}

/* --------------------------------------------------------------------------
   Responsive: Sidebar becomes off-canvas below 768px
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  .os-layout {
    grid-template-columns: 1fr;
  }

  .os-sidebar {
    transform: translateX(-100%);
  }

  .os-sidebar.os-sidebar--open {
    transform: translateX(0);
    box-shadow: var(--os-shadow);
  }

  .os-main {
    grid-column: 1;
  }

  .os-header {
    display: flex;
  }

  .os-content-area {
    padding: 0 1rem;
  }

  .os-content {
    padding-top: 1rem;
  }

  .os-footer-nav {
    flex-direction: column;
  }

  .os-footer-link {
    max-width: 100%;
  }

  .os-announce {
    padding: 0.4rem 1rem;
    font-size: 0.8125rem;
  }
}