/*
 * Spring Boot Tutorials by Rashidi Zin
 * Theme overrides layered on top of the Antora default UI (css/site.css).
 * Minimalist layout with subtle Spring Boot Leaf Green (#6db33f / #16a34a) accents.
 */

:root {
  --sbt-bg: #ffffff;
  --sbt-surface: #f8fafc;
  --sbt-border: #e2e8f0;
  --sbt-text: #334155;
  --sbt-muted: #64748b;
  --sbt-heading: #0f172a;
  --sbt-spring: #6db33f;
  --sbt-accent: #16a34a;
  --sbt-accent-strong: #15803d;
  --sbt-accent-soft: #f0fdf4;
  --sbt-accent-border: #bbf7d0;
  --sbt-code-bg: #0f172a;
  --sbt-code-text: #e2e8f0;
  --sbt-radius: 12px;
  --sbt-font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --sbt-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

body {
  font-family: var(--sbt-font);
  color: var(--sbt-text);
  background: var(--sbt-bg);
  -webkit-font-smoothing: antialiased;
}

code, kbd, pre {
  font-family: var(--sbt-mono);
}

/* ---------- Header & Search ---------- */

.navbar {
  background: rgba(255, 255, 255, 0.92);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--sbt-border);
  color: var(--sbt-heading);
}

.navbar-brand .navbar-item.brand {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  color: var(--sbt-heading);
  font-size: 1rem;
}

.navbar-brand .navbar-item.brand:hover {
  text-decoration: none;
}

.brand-mark {
  display: block;
  width: 28px;
  height: 28px;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-title {
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand-author {
  color: var(--sbt-muted);
  font-size: 0.72rem;
  font-weight: 500;
}

.navbar-burger span {
  background-color: var(--sbt-heading);
}

.navbar-menu {
  background: var(--sbt-bg);
}

.navbar-end > .navbar-item,
.navbar-end .navbar-link {
  color: var(--sbt-muted);
  font-weight: 500;
}

.navbar-end > a.navbar-item:hover {
  color: var(--sbt-heading);
  text-decoration: none;
}

.navbar-item.github {
  gap: 0.4rem;
}

.sbt-search {
  position: relative;
  display: flex;
  align-items: center;
  width: 15.5rem;
}

.sbt-search-icon {
  position: absolute;
  left: 0.65rem;
  color: var(--sbt-muted);
  pointer-events: none;
}

.sbt-search-input {
  width: 100%;
  padding: 0.38rem 3rem 0.38rem 2rem;
  border: 1px solid var(--sbt-border);
  border-radius: 8px;
  background: var(--sbt-surface);
  color: var(--sbt-heading);
  font-family: var(--sbt-font);
  font-size: 0.82rem;
  outline: none;
  transition: border-color 0.15s ease, background-color 0.15s ease, box-shadow 0.15s ease;
}

.sbt-search-input:focus {
  background: var(--sbt-bg);
  border-color: var(--sbt-spring);
  box-shadow: 0 0 0 3px rgba(109, 179, 63, 0.15);
}

.sbt-search-kbd {
  position: absolute;
  right: 0.45rem;
  padding: 0.1rem 0.38rem;
  border: 1px solid var(--sbt-border);
  border-radius: 5px;
  background: var(--sbt-bg);
  color: var(--sbt-muted);
  font-size: 0.68rem;
  font-weight: 600;
  pointer-events: none;
}

.sbt-search-results {
  position: absolute;
  top: calc(100% + 0.4rem);
  left: 0;
  right: 0;
  min-width: 20rem;
  max-height: 22rem;
  overflow-y: auto;
  background: var(--sbt-bg);
  border: 1px solid var(--sbt-border);
  border-radius: 10px;
  box-shadow: 0 12px 28px -6px rgba(15, 23, 42, 0.14);
  padding: 0.35rem;
  z-index: 100;
}

.sbt-search-hit {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  padding: 0.5rem 0.65rem;
  border-radius: 6px;
  text-decoration: none;
}

.sbt-search-hit:hover {
  background: var(--sbt-accent-soft);
}

.sbt-search-hit .hit-cat {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--sbt-accent-strong);
}

.sbt-search-hit .hit-title {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--sbt-heading);
}

.sbt-search-empty {
  padding: 0.75rem;
  text-align: center;
  color: var(--sbt-muted);
  font-size: 0.8rem;
}

@media screen and (min-width: 1024px) {
  .navbar-end > .navbar-item,
  .navbar-end .navbar-link {
    color: var(--sbt-muted);
    padding: 0 0.75rem;
  }

  .navbar-end > a.navbar-item:hover {
    background: transparent;
    color: var(--sbt-heading);
  }

  .navbar-end > .navbar-item.github {
    margin: 0 1rem 0 0.35rem;
    padding: 0.38rem 0.8rem;
    border: 1px solid var(--sbt-border);
    border-radius: 999px;
    align-self: center;
    color: var(--sbt-heading);
  }

  .navbar-end > a.navbar-item.github:hover {
    border-color: var(--sbt-spring);
    background: var(--sbt-accent-soft);
  }
}

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

.nav,
.nav-panel-explore {
  background: var(--sbt-bg);
}

.nav-container {
  border-right: 1px solid var(--sbt-border);
}

/* Hide left sidebar & toolbar on Home page for a minimalist landing layout */
@media screen and (min-width: 1024px) {
  .body:has(.doc.home) > .nav-container {
    display: none;
  }

  .body:has(.doc.home) > .main {
    margin-left: 0;
  }
}

.content:has(.doc.home) .toc.sidebar,
.main:has(.doc.home) > .toolbar {
  display: none;
}

/* Single component, single version: the explore panel adds no value. */
.nav-panel-explore {
  display: none;
}

.nav-panel-menu {
  height: 100%;
}

.nav-menu {
  padding: 1.25rem 1rem 2rem;
}

.nav-menu h3.title {
  display: none;
}

.nav-list {
  margin-left: 0;
}

.nav-item[data-depth="1"] {
  margin-top: 1.15rem;
}

/* Category labels */
.nav-item[data-depth="1"] > .nav-text,
.nav-item[data-depth="1"] > .nav-link {
  color: var(--sbt-heading);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.nav-item[data-depth="1"] > .nav-item-toggle {
  margin-left: 0;
  float: right;
  opacity: 0.5;
}

.nav-item[data-depth="2"] {
  margin-top: 0.125rem;
}

.nav-item[data-depth="2"] > .nav-link {
  display: block;
  padding: 0.35rem 0.625rem;
  border-radius: 6px;
  color: var(--sbt-muted);
  font-size: 0.84rem;
  line-height: 1.4;
}

.nav-item[data-depth="2"] > .nav-link:hover {
  background: var(--sbt-surface);
  color: var(--sbt-heading);
  text-decoration: none;
}

.nav-item[data-depth="1"] > .nav-list {
  margin-top: 0.375rem;
  padding-left: 0.5rem;
  border-left: 1px solid var(--sbt-border);
}

.is-current-page > .nav-link,
.is-current-page > .nav-text {
  font-weight: 600;
}

.nav-item[data-depth="2"].is-current-page > .nav-link {
  background: var(--sbt-accent-soft);
  color: var(--sbt-accent-strong);
  border-left: 2px solid var(--sbt-spring);
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
}

/* ---------- Toolbar ---------- */

.toolbar {
  background: var(--sbt-bg);
  box-shadow: none;
  border-bottom: 1px solid var(--sbt-border);
  color: var(--sbt-muted);
}

@media screen and (min-width: 1024px) {
  .toolbar {
    display: none;
  }
}

.page-versions {
  display: none;
}

/* ---------- Single Article Header & Metadata ---------- */

.article-header {
  margin: 2rem 0 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--sbt-border);
}

.article-eyebrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.625rem;
  margin-bottom: 0.75rem;
}

.eyebrow-category {
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--sbt-accent-strong);
}

.eyebrow-stack {
  font-family: var(--sbt-mono);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  background: var(--sbt-accent-soft);
  border: 1px solid var(--sbt-accent-border);
  color: var(--sbt-accent-strong);
}

.doc .article-header > h1.page {
  margin: 0 0 1rem;
  font-size: 2.25rem;
  font-weight: 750;
  letter-spacing: -0.025em;
  line-height: 1.15;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.625rem;
}

.doc .meta-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--sbt-border);
  border-radius: 8px;
  background: var(--sbt-surface);
  color: var(--sbt-text);
  font-family: var(--sbt-font);
  font-size: 0.78rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease, color 0.15s ease;
}

.doc .meta-chip:hover {
  border-color: var(--sbt-spring);
  background: var(--sbt-accent-soft);
  color: var(--sbt-heading);
}

.doc .meta-chip code {
  border: 0;
  background: transparent;
  padding: 0;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--sbt-heading);
}

.doc .meta-chip .cmd-prompt {
  color: var(--sbt-accent);
  font-family: var(--sbt-mono);
  font-weight: 700;
}

.doc .meta-chip .copy-status {
  margin-left: 0.25rem;
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  background: var(--sbt-bg);
  border: 1px solid var(--sbt-border);
  color: var(--sbt-muted);
  font-size: 0.68rem;
  font-weight: 600;
}

.doc .meta-chip.is-copied {
  border-color: var(--sbt-spring);
  background: var(--sbt-accent-soft);
}

.doc .meta-chip.is-copied .copy-status {
  background: var(--sbt-spring);
  border-color: var(--sbt-spring);
  color: #fff;
}

/* ---------- Article Typography & Code ---------- */

.doc {
  color: var(--sbt-text);
  line-height: 1.75;
  hyphens: none;
}

@media screen and (min-width: 1024px) {
  .doc {
    margin: 0 3rem;
    max-width: 48rem;
  }
}

.doc h1,
.doc h2,
.doc h3,
.doc h4,
.doc h5,
.doc h6 {
  color: var(--sbt-heading);
  font-weight: 650;
  letter-spacing: -0.015em;
}

.doc > h1.page:first-child {
  font-size: 2.25rem;
  font-weight: 750;
  letter-spacing: -0.025em;
  line-height: 1.15;
  margin: 2.5rem 0 1.5rem;
}

.doc h2:not(.discrete) {
  border-bottom: 0;
  margin: 2.5rem 0 0;
  padding: 0;
  font-size: 1.45rem;
}

.doc h3 {
  font-size: 1.18rem;
  margin-top: 2rem;
}

.doc a {
  color: var(--sbt-accent-strong);
  text-decoration: underline;
  text-decoration-color: rgba(22, 163, 74, 0.35);
  text-underline-offset: 3px;
}

.doc a:hover {
  color: var(--sbt-accent);
  text-decoration-color: currentColor;
}

.doc h2 a.anchor,
.doc h3 a.anchor {
  text-decoration: none;
}

.doc .colist > table code,
.doc p code,
.doc li code,
.doc thead code,
.doc td code {
  background: var(--sbt-surface);
  border: 1px solid var(--sbt-border);
  border-radius: 5px;
  color: var(--sbt-heading);
  font-size: 0.85em;
  padding: 0.1em 0.35em;
}

/* Code blocks */
.doc .listingblock > .title,
.doc .literalblock > .title {
  color: var(--sbt-muted);
  font-size: 0.8rem;
  font-style: normal;
  font-weight: 600;
}

.doc .listingblock pre:not(.highlight),
.doc .literalblock pre,
.doc pre.highlight > code {
  background: var(--sbt-code-bg);
  color: var(--sbt-code-text);
  border-radius: var(--sbt-radius);
  border: 1px solid #1e293b;
  box-shadow: none;
  padding: 1.15rem 1.25rem;
}

.doc pre {
  font-size: 0.82rem;
  line-height: 1.65;
}

.doc .source-toolbox {
  color: #94a3b8;
  top: 0.5rem;
  right: 0.75rem;
}

.doc .source-toolbox img.copy-icon {
  filter: invert(70%);
}

/* highlight.js — dark theme with Spring Leaf Green annotations */
.hljs { color: var(--sbt-code-text); }
.hljs-comment, .hljs-quote { color: #64748b; font-style: italic; }
.hljs-keyword, .hljs-selector-tag, .hljs-built_in, .hljs-meta .hljs-keyword { color: #c084fc; }
.hljs-string, .hljs-doctag, .hljs-regexp, .hljs-addition { color: #86efac; }
.hljs-number, .hljs-literal, .hljs-symbol, .hljs-bullet { color: #fdba74; }
.hljs-title, .hljs-section, .hljs-title.class_, .hljs-title.function_ { color: #7dd3fc; }
.hljs-type, .hljs-class .hljs-title { color: #fde68a; }
.hljs-attr, .hljs-attribute, .hljs-variable, .hljs-template-variable, .hljs-name, .hljs-tag { color: #93c5fd; }
.hljs-meta { color: #4ade80; font-weight: 500; }
.hljs-meta .hljs-string { color: #86efac; }
.hljs-params { color: var(--sbt-code-text); }
.hljs-deletion { color: #fca5a5; }

/* Admonitions as soft cards */
.doc .admonitionblock td.content {
  background: var(--sbt-surface);
  border: 1px solid var(--sbt-border);
  border-left: 3px solid var(--sbt-muted);
  border-radius: var(--sbt-radius);
  padding: 1.25rem 1.25rem 1rem;
}

.doc .admonitionblock.note td.content { border-left-color: #3b82f6; background: #eff6ff; }
.doc .admonitionblock.tip td.content { border-left-color: var(--sbt-spring); background: var(--sbt-accent-soft); }
.doc .admonitionblock.important td.content { border-left-color: #ef4444; background: #fef2f2; }
.doc .admonitionblock.warning td.content { border-left-color: #f59e0b; background: #fffbeb; }
.doc .admonitionblock.caution td.content { border-left-color: #a855f7; background: #faf5ff; }

.doc .admonitionblock td.icon {
  transform: translate(0.75rem, -50%);
}

.doc .admonitionblock td.icon i {
  border-radius: 999px;
  font-size: 0.68rem;
  letter-spacing: 0.04em;
}

.doc .admonitionblock td.icon i.icon-note { background-color: #3b82f6; }
.doc .admonitionblock td.icon i.icon-tip { background-color: var(--sbt-spring); }
.doc .admonitionblock td.icon i.icon-important { background-color: #ef4444; }
.doc .admonitionblock td.icon i.icon-warning { background-color: #f59e0b; }
.doc .admonitionblock td.icon i.icon-caution { background-color: #a855f7; }

/* Tables */
.doc table.tableblock {
  border-radius: var(--sbt-radius);
}

.doc table.tableblock,
.doc table.tableblock > * > tr > * {
  border-color: var(--sbt-border);
}

.doc table.tableblock thead th {
  background: var(--sbt-surface);
  color: var(--sbt-heading);
}

/* Card-style Previous / Next Pagination */
.pagination {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: 1rem;
  border-top: 1px solid var(--sbt-border);
  margin-top: 3.5rem;
  padding-top: 2rem;
}

.pagination > span {
  display: flex;
  flex-direction: column;
  padding: 0.9rem 1.15rem;
  border: 1px solid var(--sbt-border);
  border-radius: var(--sbt-radius);
  background: var(--sbt-bg);
  transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
}

.pagination > span:hover {
  border-color: var(--sbt-spring);
  box-shadow: 0 6px 18px -8px rgba(15, 23, 42, 0.12);
  transform: translateY(-1px);
}

.pagination a {
  text-decoration: none;
  color: var(--sbt-heading);
  font-weight: 600;
}

/* ---------- Table of contents ---------- */

.toc .toc-menu h3 {
  color: var(--sbt-heading);
  font-size: 0.72rem !important;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.toc .toc-menu a {
  border-left-color: var(--sbt-border);
  color: var(--sbt-muted);
}

.toc .toc-menu a:hover {
  color: var(--sbt-heading);
}

.toc .toc-menu a.is-active {
  border-left-color: var(--sbt-spring);
  color: var(--sbt-accent-strong);
  font-weight: 600;
}

@media screen and (min-width: 1024px) {
  aside.toc.sidebar {
    flex-basis: 13rem;
  }
}

/* ---------- Home Page (Minimalist Centered Layout) ---------- */

.doc.home {
  max-width: 68rem;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
}

.hero {
  text-align: center;
  padding: 3.25rem 0 2rem;
}

.hero-eyebrow {
  display: inline-block;
  margin: 0 0 1rem;
  padding: 0.25rem 0.85rem;
  border-radius: 999px;
  background: var(--sbt-accent-soft);
  border: 1px solid var(--sbt-accent-border);
  color: var(--sbt-accent-strong);
  font-family: var(--sbt-mono);
  font-size: 0.78rem;
  font-weight: 600;
}

.doc.home .hero h1.page {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.08;
  margin: 0;
}

.hero-lead {
  max-width: 38rem;
  margin: 0.85rem auto 0;
  color: var(--sbt-muted);
  font-size: 1.1rem;
  line-height: 1.6;
}

/* Filter Pills */
.module-explorer {
  margin: 0.5rem 0 3rem;
}

.module-pills {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.module-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.42rem 0.9rem;
  border: 1px solid var(--sbt-border);
  border-radius: 999px;
  background: var(--sbt-surface);
  color: var(--sbt-text);
  font-family: var(--sbt-font);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.module-pill:hover {
  border-color: var(--sbt-spring);
  color: var(--sbt-heading);
}

.module-pill .pill-count {
  color: var(--sbt-muted);
  font-weight: 500;
  font-size: 0.76rem;
}

.module-pill.is-active {
  background: var(--sbt-spring);
  border-color: var(--sbt-spring);
  color: #ffffff;
}

.module-pill.is-active .pill-count {
  color: rgba(255, 255, 255, 0.9);
}

/* Tutorial Cards Grid */
.tutorial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(18.5rem, 1fr));
  gap: 1.15rem;
}

.doc .tutorial-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.1rem;
  padding: 1.35rem 1.4rem;
  border: 1px solid var(--sbt-border);
  border-radius: var(--sbt-radius);
  background: var(--sbt-bg);
  text-decoration: none;
  transition: border-color 0.15s ease, background-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
}

.doc .tutorial-card[hidden] {
  display: none !important;
}

.doc .tutorial-card:hover {
  border-color: var(--sbt-spring);
  background: #fafdf9;
  box-shadow: 0 10px 24px -10px rgba(22, 163, 74, 0.18);
  transform: translateY(-2px);
}

.card-top {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.card-eyebrow {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--sbt-accent-strong);
}

.doc .tutorial-card .card-title {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--sbt-heading);
}

.card-bottom {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.card-tag {
  font-family: var(--sbt-mono);
  font-size: 0.7rem;
  font-weight: 500;
  padding: 0.15rem 0.5rem;
  border-radius: 6px;
  background: #f1f5f9;
  color: #475569;
}

.card-cta {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--sbt-accent-strong);
}

.tutorial-empty {
  text-align: center;
  padding: 2rem;
  color: var(--sbt-muted);
}

/* The hero replaces the intro paragraph on the home page. */
.doc.home > #preamble {
  display: none;
}

/* ---------- Footer ---------- */

footer.footer {
  background: var(--sbt-surface);
  border-top: 1px solid var(--sbt-border);
  color: var(--sbt-muted);
  padding: 2rem 1.5rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: 72rem;
  margin: 0 auto;
}

.footer-inner p {
  margin: 0;
}

.footer-brand a {
  color: var(--sbt-heading);
  font-weight: 600;
}

#badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
}

/* ---------- Mobile ---------- */

@media screen and (max-width: 1023.5px) {
  .navbar-menu {
    border-bottom: 1px solid var(--sbt-border);
    box-shadow: 0 8px 16px -8px rgba(15, 23, 42, 0.12);
  }

  .navbar-end > .navbar-item {
    color: var(--sbt-heading);
  }

  .sbt-search {
    width: 100%;
  }

  .hero {
    padding-top: 2rem;
  }

  .doc.home .hero h1.page {
    font-size: 2.25rem;
  }
}

/* On desktop the sidebar "Contents" replaces the embedded :toc: block. */
@media screen and (min-width: 1024px) {
  .doc > #toc.toc {
    display: none;
  }
}

.doc.home aside.toc.embedded {
  display: none;
}

.doc.home .hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 3.25rem 0 2rem;
}

.doc.home .hero .hero-lead {
  max-width: 42rem;
  margin: 0.85rem auto 0;
  color: var(--sbt-muted);
  font-size: 1.1rem;
  line-height: 1.6;
  text-wrap: balance;
}

/* ==========================================================================
   System-Preference Dark Mode (Aligned with rashidi.zin.my)
   ========================================================================== */

:root {
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    /* Core Surface & Canvas Tokens */
    --sbt-bg: #0b0f19;
    --sbt-surface: #111827;
    --sbt-surface-elevated: #1e293b;
    --sbt-surface-hover: #1e293b;
    --sbt-border: #1e293b;
    --sbt-border-strong: #334155;

    /* Typography Hierarchy */
    --sbt-text: #f8fafc;
    --sbt-text-secondary: #cbd5e1;
    --sbt-text-muted: #94a3b8;

    /* Spring Brand Accents (Lifted for dark contrast) */
    --sbt-accent: #4ade80;
    --sbt-accent-hover: #22c55e;
    --sbt-accent-subtle: rgba(74, 222, 128, 0.12);

    /* Code & Preformatted Blocks */
    --sbt-code-bg: #020617;
    --sbt-inline-code-bg: #1e293b;
    --sbt-inline-code-text: #e2e8f0;

    /* Shadows */
    --sbt-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
    --sbt-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -2px rgba(0, 0, 0, 0.5);
  }

  /* 1. Document Canvas & Base Typography */
  html,
  body,
  .body {
    background-color: var(--sbt-bg) !important;
    color: var(--sbt-text) !important;
  }

  /* 2. Top Header & Search Trigger */
  .header,
  .navbar,
  header > nav {
    background-color: rgba(11, 15, 25, 0.85) !important;
    border-bottom: 1px solid var(--sbt-border) !important;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
  }

  .navbar-brand .navbar-item,
  .navbar-end .navbar-item,
  .navbar-link {
    color: var(--sbt-text) !important;
  }

  /* Search button & ⌘K shortcut badge */
  #search-input,
  .search-button,
  header button {
    background-color: var(--sbt-surface-elevated) !important;
    color: var(--sbt-text-secondary) !important;
    border-color: var(--sbt-border-strong) !important;
  }

  kbd {
    background-color: var(--sbt-bg) !important;
    color: var(--sbt-text-muted) !important;
    border-color: var(--sbt-border-strong) !important;
    box-shadow: none !important;
  }

  /* 3. Left Navigation Sidebar & Component Drawer */
  .nav-container,
  .nav,
  .nav-panel-menu,
  .nav-panel-explore,
  .nav-panel-explore .context {
    background-color: var(--sbt-bg) !important;
    border-color: var(--sbt-border) !important;
    color: var(--sbt-text-secondary) !important;
  }

  .nav-item .nav-link,
  .nav-item .nav-text {
    color: var(--sbt-text-secondary) !important;
  }

  .nav-item.is-active > .nav-link,
  .nav-link:hover {
    color: var(--sbt-accent) !important;
    background-color: var(--sbt-accent-subtle) !important;
  }

  /* 4. Toolbar, Breadcrumbs & Right Table of Contents */
  .toolbar {
    background-color: var(--sbt-bg) !important;
    border-bottom: 1px solid var(--sbt-border) !important;
    color: var(--sbt-text-muted) !important;
  }

  .breadcrumbs a,
  .breadcrumbs li {
    color: var(--sbt-text-muted) !important;
  }

  .breadcrumbs a:hover {
    color: var(--sbt-accent) !important;
  }

  .toc.sidebar .toc-menu a {
    color: var(--sbt-text-muted) !important;
    border-left-color: var(--sbt-border) !important;
  }

  .toc.sidebar .toc-menu a.is-active {
    color: var(--sbt-accent) !important;
    border-left-color: var(--sbt-accent) !important;
  }

  /* 5. Main Article Content (.doc) */
  .doc {
    color: var(--sbt-text-secondary) !important;
  }

  .doc h1,
  .doc h2,
  .doc h3,
  .doc h4,
  .doc h5,
  .doc h6 {
    color: var(--sbt-text) !important;
    border-bottom-color: var(--sbt-border) !important;
  }

  .doc a {
    color: var(--sbt-accent) !important;
  }

  .doc a:hover {
    color: var(--sbt-accent-hover) !important;
  }

  /* 6. Code Blocks, Highlight.js & Inline Code */
  .doc pre.highlight,
  .doc .listingblock pre,
  .doc pre.highlight > code {
    background-color: var(--sbt-code-bg) !important;
    border: 1px solid var(--sbt-border-strong) !important;
  }

  .doc :not(pre) > code {
    background-color: var(--sbt-inline-code-bg) !important;
    color: var(--sbt-inline-code-text) !important;
    border: 1px solid var(--sbt-border-strong) !important;
  }

  /* Source toolbox (language badge & copy button) */
  .doc .source-toolbox {
    color: var(--sbt-text-muted) !important;
  }

  /* 7. Landing Page Hero, Filter Tabs & Tutorial Cards */
  [role="tablist"] button {
    background-color: var(--sbt-surface) !important;
    color: var(--sbt-text-secondary) !important;
    border-color: var(--sbt-border-strong) !important;
  }

  [role="tablist"] button:hover {
    background-color: var(--sbt-surface-elevated) !important;
    color: var(--sbt-text) !important;
  }

  [role="tablist"] button[aria-selected="true"] {
    background-color: var(--sbt-accent-subtle) !important;
    color: var(--sbt-accent) !important;
    border-color: var(--sbt-accent) !important;
  }

  /* Tutorial Card Surfaces */
  .tutorial-card,
  .card,
  article a[href*=".html"] {
    background-color: var(--sbt-surface) !important;
    border-color: var(--sbt-border-strong) !important;
    box-shadow: var(--sbt-shadow-sm) !important;
  }

  .tutorial-card:hover,
  .card:hover {
    background-color: var(--sbt-surface-elevated) !important;
    border-color: var(--sbt-accent) !important;
    box-shadow: var(--sbt-shadow-md) !important;
  }

  /* 8. Tables, Admonitions & Footer */
  .doc table.tableblock,
  .doc table.tableblock th,
  .doc table.tableblock td {
    background-color: var(--sbt-bg) !important;
    border-color: var(--sbt-border-strong) !important;
    color: var(--sbt-text-secondary) !important;
  }

  .doc table.tableblock thead th {
    background-color: var(--sbt-surface) !important;
    color: var(--sbt-text) !important;
  }

  .doc .admonitionblock > table {
    background-color: var(--sbt-surface) !important;
    border-color: var(--sbt-border-strong) !important;
  }

  footer,
  .footer {
    background-color: var(--sbt-bg) !important;
    border-top: 1px solid var(--sbt-border) !important;
    color: var(--sbt-text-muted) !important;
  }
}