/* kwelea — theme.css
 * Extracted from _dev/docs-ui.html — the design source of truth.
 * Additions: admonition styles, D2 diagram styles, self-hosted fonts.
 */

/* ── Fonts (self-hosted, embedded in binary) ── */
@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("fonts/ibm-plex-mono-400.woff2") format("woff2");
}
@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("fonts/ibm-plex-mono-500.woff2") format("woff2");
}
@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 100 700;
  font-display: swap;
  src: url("fonts/ibm-plex-sans.woff2") format("woff2");
}
@font-face {
  font-family: "Lora";
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url("fonts/lora.woff2") format("woff2");
}
@font-face {
  font-family: "Lora";
  font-style: italic;
  font-weight: 400 700;
  font-display: swap;
  src: url("fonts/lora-italic.woff2") format("woff2");
}

/* ── Reset & Variables ── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #f7f5f0;
  --bg-alt: #efecea;
  --surface: #ffffff;
  --border: #dddad4;
  --border-soft: #e8e5df;
  --text: #1a1916;
  --text-2: #5a5750;
  --text-3: #696460;
  --accent: #2563a8;
  --accent-dim: #dbeafe;
  --accent-2: #b45309;
  --code-bg: #f0ede7;
  --nav-active: #2563a8;
  --sidebar-w: 260px;
  --toc-w: 220px;
  --header-h: 56px;
  --font-sans: "IBM Plex Sans", sans-serif;
  --font-serif: "Lora", Georgia, serif;
  --font-mono: "IBM Plex Mono", monospace;
  --radius: 4px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --transition: 0.2s ease;
}

[data-theme="dark"] {
  --bg: #111110;
  --bg-alt: #1a1918;
  --surface: #1e1d1c;
  --border: #2e2c2a;
  --border-soft: #252422;
  --text: #e8e5df;
  --text-2: #9a9790;
  --text-3: #8a8780;
  --accent: #60a5fa;
  --nav-active: #60a5fa;
  --accent-dim: #1e3a5f;
  --accent-2: #fbbf24;
  --code-bg: #161514;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* ── Header ── */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 1.25rem;
  gap: 1rem;
  box-shadow: var(--shadow);
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  flex-shrink: 0;
}

.logo-mark {
  width: 28px;
  height: 28px;
  background: var(--accent);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: -0.02em;
}

.header-version {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-3);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  padding: 0.15rem 0.45rem;
  border-radius: 20px;
}

.header-search {
  flex: 1;
  max-width: 360px;
  margin-left: auto;
  position: relative;
}

.header-search input {
  width: 100%;
  height: 34px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0 2.5rem 0 0.75rem;
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  color: var(--text);
  outline: none;
  transition:
    border-color var(--transition),
    box-shadow var(--transition);
}

.header-search input::placeholder {
  color: var(--text-3);
}
.header-search input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

.search-kbd {
  position: absolute;
  right: 0.5rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-3);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.1rem 0.3rem;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: 1rem;
}

.btn-icon {
  width: 34px;
  height: 34px;
  border: 1px solid var(--border);
  background: var(--bg-alt);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-2);
  transition:
    background var(--transition),
    color var(--transition),
    border-color var(--transition);
}

.btn-icon:hover {
  background: var(--surface);
  color: var(--text);
  border-color: var(--accent);
}

.menu-toggle {
  display: none;
}

/* ── Layout ── */
.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr var(--toc-w);
  grid-template-rows: 1fr;
  margin-top: var(--header-h);
  min-height: calc(100vh - var(--header-h));
}

/* ── Sidebar ── */
.sidebar {
  position: sticky;
  top: var(--header-h);
  height: calc(100vh - var(--header-h));
  overflow-y: auto;
  border-right: 1px solid var(--border);
  background: var(--surface);
  padding: 1.5rem 0;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.nav-section {
  margin-bottom: 1.75rem;
}

.nav-section-label {
  font-family: var(--font-mono);
  font-size: 0.675rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-3);
  padding: 0 1.25rem;
  margin-bottom: 0.5rem;
}

.nav-item {
  display: flex;
  align-items: center;
  padding: 0.35rem 1.25rem;
  font-size: 0.8125rem;
  color: var(--text-2);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition:
    color var(--transition),
    background var(--transition),
    border-color var(--transition);
  gap: 0.5rem;
  position: relative;
}

.nav-item:hover {
  color: var(--text);
  background: var(--bg-alt);
}

.nav-item.active {
  color: var(--nav-active);
  border-left-color: var(--nav-active);
  font-weight: 500;
}

/* ── Main Content ── */
.main {
  min-width: 0;
  padding: 2.5rem 3rem;
}

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

.content-breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-3);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.content-breadcrumb a {
  color: var(--text-3);
  text-decoration: none;
}

.content-breadcrumb a:hover {
  color: var(--accent);
}

.content-title {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 600;
  line-height: 1.25;
  color: var(--text);
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

/* ── Prose ── */
.prose h2 {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--text);
  margin: 2.25rem 0 0.75rem;
  padding-top: 0.25rem;
  letter-spacing: -0.01em;
  scroll-margin-top: calc(var(--header-h) + 1rem);
}

.prose h3 {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  margin: 1.75rem 0 0.5rem;
  scroll-margin-top: calc(var(--header-h) + 1rem);
}

.prose p {
  font-family: var(--font-serif);
  font-size: 1rem;
  color: var(--text-2);
  line-height: 1.8;
  margin-bottom: 1.1rem;
}

.prose a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.82em;
  background: var(--code-bg);
  border: 1px solid var(--border-soft);
  padding: 0.1em 0.35em;
  border-radius: 3px;
  color: var(--accent-2);
}

.prose pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin: 1.25rem 0;
  position: relative;
}

.prose pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.875rem;
  color: var(--text);
  line-height: 1.7;
}

/* Chroma wraps code in .highlight > pre — reset border/bg so our outer .prose pre styles win */
.prose .highlight {
  margin: 1.25rem 0;
}

.prose .highlight pre {
  margin: 0;
}

.code-copy {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-3);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.2rem 0.5rem;
  cursor: pointer;
  transition:
    color var(--transition),
    border-color var(--transition);
}

.code-copy:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.prose ul,
.prose ol {
  font-family: var(--font-serif);
  font-size: 1rem;
  color: var(--text-2);
  line-height: 1.8;
  margin: 0 0 1.1rem 1.5rem;
}

.prose li {
  margin-bottom: 0.3rem;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  margin: 1.25rem 0;
}

.prose th {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-align: left;
  padding: 0.5rem 0.75rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  color: var(--text-2);
}

.prose td {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  color: var(--text-2);
  vertical-align: top;
}

.prose blockquote {
  border-left: 3px solid var(--border);
  padding: 0.5rem 1rem;
  margin: 1.25rem 0;
  color: var(--text-3);
  font-style: italic;
}

/* ── Admonitions ── */
.admonition {
  border-left: 3px solid var(--accent);
  background: var(--accent-dim);
  padding: 0.9rem 1.1rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1.25rem 0;
}

.admonition-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 0.35rem;
}

.admonition-body > p {
  font-size: 0.875rem;
  margin-bottom: 0;
  color: var(--text);
}

.admonition-info {
  border-color: var(--accent);
  background: var(--accent-dim);
}
.admonition-info .admonition-label {
  color: var(--accent);
}

.admonition-tip {
  border-color: #16a34a;
  background: #dcfce7;
}
[data-theme="dark"] .admonition-tip {
  background: #0a2a14;
}
.admonition-tip .admonition-label {
  color: #16a34a;
}

.admonition-warning {
  border-color: var(--accent-2);
  background: #fef3c7;
}
[data-theme="dark"] .admonition-warning {
  background: #2a1f0a;
}
.admonition-warning .admonition-label {
  color: var(--accent-2);
}

.admonition-danger {
  border-color: #dc2626;
  background: #fee2e2;
}
[data-theme="dark"] .admonition-danger {
  background: #2a0a0a;
}
.admonition-danger .admonition-label {
  color: #dc2626;
}

details.admonition {
  border-left-color: var(--text-3);
  background: var(--bg-alt);
}

details.admonition > summary {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  cursor: pointer;
  color: var(--text-2);
  padding: 0.1rem 0;
  list-style: none;
}

details.admonition > summary::before {
  content: "▶ ";
  font-size: 0.6rem;
  color: var(--text-3);
}

details.admonition[open] > summary::before {
  content: "▼ ";
}
details.admonition[open] > summary {
  margin-bottom: 0.5rem;
}

/* ── D2 Diagrams ── */
.d2-diagram {
  margin: 1.5rem 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
  text-align: center;
  padding: 1rem;
}

.d2-diagram svg {
  max-width: 100%;
  height: auto;
}

.d2-light {
  display: block;
}
.d2-dark {
  display: none;
}

[data-theme="dark"] .d2-light {
  display: none;
}
[data-theme="dark"] .d2-dark {
  display: block;
}

/* ── ToC ── */
.toc {
  position: sticky;
  top: var(--header-h);
  height: calc(100vh - var(--header-h));
  overflow-y: auto;
  padding: 1.75rem 1.25rem;
  border-left: 1px solid var(--border);
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.toc-label {
  font-family: var(--font-mono);
  font-size: 0.675rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 0.75rem;
}

.toc-list {
  list-style: none;
}
.toc-list li {
  margin-bottom: 0.1rem;
}

.toc-link {
  display: block;
  font-size: 0.775rem;
  color: var(--text-3);
  text-decoration: none;
  padding: 0.25rem 0.5rem;
  border-radius: 3px;
  border-left: 2px solid transparent;
  transition:
    color var(--transition),
    background var(--transition);
  line-height: 1.4;
}

.toc-link:hover {
  color: var(--text);
}
.toc-link.active {
  color: var(--accent);
  border-left-color: var(--accent);
}

.toc-link.h3 {
  padding-left: 1.25rem;
  font-size: 0.725rem;
}

.toc-divider {
  border: none;
  border-top: 1px solid var(--border-soft);
  margin: 1.25rem 0;
}

.toc-edit {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.725rem;
  color: var(--text-3);
  text-decoration: none;
  font-family: var(--font-mono);
  transition: color var(--transition);
}

.toc-edit:hover {
  color: var(--accent);
}

/* ── Prev/Next Pager ── */
.pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-soft);
}

.pager-card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.9rem 1.1rem;
  text-decoration: none;
  color: var(--text);
  background: var(--surface);
  transition:
    border-color var(--transition),
    box-shadow var(--transition),
    background var(--transition);
}

.pager-card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

.pager-card.next {
  text-align: right;
}

.pager-dir {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 0.3rem;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.pager-card.next .pager-dir {
  justify-content: flex-end;
}

.pager-title {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--accent);
}

/* ── Search Modal ── */
.search-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(2px);
  align-items: flex-start;
  justify-content: center;
  padding-top: 8vh;
}

.search-overlay.open {
  display: flex;
}

.search-modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 90%;
  max-width: 560px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
  overflow: hidden;
}

.search-modal-input-wrap {
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--border);
  padding: 0 1rem;
  gap: 0.75rem;
}

.search-modal-input-wrap svg {
  color: var(--text-3);
  flex-shrink: 0;
}

.search-modal-input {
  flex: 1;
  height: 52px;
  background: none;
  border: none;
  outline: none;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  color: var(--text);
}

.search-modal-input::placeholder {
  color: var(--text-3);
}

.search-results {
  padding: 0.75rem 0;
  max-height: 380px;
  overflow-y: auto;
}

.search-empty {
  padding: 2rem 1rem;
  text-align: center;
  font-size: 0.875rem;
  color: var(--text-3);
  font-family: var(--font-mono);
}

.search-result {
  display: flex;
  flex-direction: column;
  padding: 0.65rem 1rem;
  cursor: pointer;
  transition: background var(--transition);
  gap: 0.15rem;
  text-decoration: none;
}

.search-result:hover,
.search-result.focused {
  background: var(--accent-dim);
}

.search-result-title {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
}

.search-result-path {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-3);
}

.search-result-snippet {
  font-size: 0.775rem;
  color: var(--text-2);
  line-height: 1.5;
}

.search-result-snippet mark {
  background: var(--accent-dim);
  color: var(--accent);
  border-radius: 2px;
  padding: 0 0.1em;
}

.search-footer {
  border-top: 1px solid var(--border);
  padding: 0.5rem 1rem;
  display: flex;
  gap: 1rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-3);
}

.search-footer kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.05rem 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-2);
  margin-right: 0.25rem;
}

/* ── Responsive ── */
@media (max-width: 1100px) {
  .layout {
    grid-template-columns: var(--sidebar-w) 1fr;
  }
  .toc {
    display: none;
  }
  .main {
    padding: 2rem 2rem;
  }
}

@media (max-width: 768px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    top: var(--header-h);
    left: 0;
    width: var(--sidebar-w);
    z-index: 90;
    transform: translateX(-100%);
    transition:
      transform 0.25s ease,
      box-shadow 0.25s ease;
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.15);
  }

  .menu-toggle {
    display: flex;
  }
  .main {
    padding: 1.5rem 1.25rem;
  }
  .pager {
    grid-template-columns: 1fr;
  }
  .content-title {
    font-size: 1.6rem;
  }
  .header-search {
    max-width: 200px;
  }
  .search-kbd {
    display: none;
  }
}

@media (max-width: 480px) {
  .header-search {
    display: none;
  }
}

/* ── Mobile sidebar backdrop ── */
.sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 89;
}

.sidebar-backdrop.open {
  display: block;
}