/* EasyChat docs — palette aligned with addon icon (#5aafff) */

:root {
  --accent: #5aafff;
  --accent-dim: #3d8ae0;
  --accent-soft: rgba(90, 175, 255, 0.14);
  --accent-glow: rgba(90, 175, 255, 0.35);
  --bg-deep: #070a0f;
  --bg: #0c1018;
  --surface: #121923;
  --surface-elevated: #171e2b;
  --border: rgba(90, 175, 255, 0.12);
  --border-strong: rgba(90, 175, 255, 0.22);
  --text: #e8eef7;
  --text-muted: #9aa8bc;
  --text-faint: #6b7a90;
  --radius: 12px;
  --radius-sm: 8px;
  --header-h: 64px;
  --font-sans: "DM Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --scrollbar-track: #0a0e14;
  --scrollbar-thumb: rgba(90, 175, 255, 0.35);
  --scrollbar-thumb-hover: rgba(90, 175, 255, 0.55);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg-deep);
  background-image:
    radial-gradient(ellipse 120% 80% at 50% -30%, rgba(90, 175, 255, 0.12), transparent 55%),
    radial-gradient(ellipse 70% 50% at 100% 0%, rgba(61, 138, 224, 0.08), transparent 45%),
    linear-gradient(180deg, var(--bg-deep) 0%, var(--bg) 22%, var(--bg-deep) 100%);
  min-height: 100vh;
}

* {
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

*::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

*::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
  border-radius: 999px;
}

*::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--scrollbar-thumb), rgba(61, 138, 224, 0.28));
  border-radius: 999px;
  border: 2px solid var(--scrollbar-track);
}

*::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--scrollbar-thumb-hover), var(--accent-dim));
}

*::-webkit-scrollbar-corner {
  background: var(--scrollbar-track);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 12px;
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: #041018;
  font-weight: 600;
  border-radius: var(--radius-sm);
  z-index: 1000;
  text-decoration: none;
}

.skip-link:focus {
  left: 12px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(7, 10, 15, 0.82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.25rem;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
  color: inherit;
  min-width: 0;
}

.brand-icon {
  flex-shrink: 0;
  border-radius: 10px;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  min-width: 0;
}

.brand-name {
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #fff 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.brand-tagline {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.search-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition), background var(--transition);
}

.search-trigger:hover {
  border-color: var(--border-strong);
  color: var(--text);
  background: var(--surface-elevated);
}

.search-trigger kbd {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.12rem 0.4rem;
  border-radius: 4px;
  background: var(--bg-deep);
  border: 1px solid var(--border);
  color: var(--text-faint);
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 4px;
  background: var(--surface);
  border-radius: 999px;
  border: 1px solid var(--border);
}

.lang-switch-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-faint);
  padding-left: 0.65rem;
  padding-right: 0.15rem;
}

.lang-btn {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.8rem;
  padding: 0.45rem 0.85rem;
  border: none;
  border-radius: 999px;
  cursor: pointer;
  background: transparent;
  color: var(--text-muted);
  transition: color var(--transition), background var(--transition), box-shadow var(--transition);
}

.lang-btn:hover {
  color: var(--text);
}

.lang-btn[aria-pressed="true"] {
  background: linear-gradient(145deg, var(--accent), var(--accent-dim));
  color: #041018;
  box-shadow: 0 2px 12px var(--accent-glow);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
}

.nav-toggle:hover {
  border-color: var(--border-strong);
  background: var(--surface-elevated);
}

.layout {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 0;
  min-height: calc(100vh - var(--header-h));
  position: relative;
}

.sidebar {
  position: sticky;
  top: var(--header-h);
  align-self: start;
  max-height: calc(100vh - var(--header-h));
  overflow-y: auto;
  padding: 1.5rem 1rem 2rem 1.25rem;
  border-right: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(12, 16, 24, 0.4) 0%, transparent 100%);
}

.sidebar-inner {
  position: relative;
}

.sidebar-heading {
  margin: 0 0 0.75rem;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-faint);
}

.sidebar-heading.toc-page {
  margin-top: 1.25rem;
}

.nav-groups {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  margin-bottom: 0.5rem;
}

.nav-group-label {
  margin: 0 0 0.35rem;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--accent);
  opacity: 0.95;
}

.nav-pages {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.nav-pages a {
  display: block;
  padding: 0.38rem 0.55rem 0.38rem 0.65rem;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.86rem;
  line-height: 1.35;
  border-left: 2px solid transparent;
  transition: color var(--transition), background var(--transition), border-color var(--transition);
}

.nav-pages a:hover {
  color: var(--text);
  background: var(--accent-soft);
}

.nav-pages a.active {
  color: var(--accent);
  background: var(--accent-soft);
  border-left-color: var(--accent);
  font-weight: 600;
}

.toc {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.toc a {
  display: block;
  padding: 0.35rem 0.5rem 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.88rem;
  line-height: 1.35;
  border-left: 2px solid transparent;
  transition: color var(--transition), background var(--transition), border-color var(--transition);
}

.toc a:hover {
  color: var(--text);
  background: var(--accent-soft);
}

.toc a.active {
  color: var(--accent);
  background: var(--accent-soft);
  border-left-color: var(--accent);
  font-weight: 600;
}

.toc a.toc-h3 {
  padding-left: 1.15rem;
  font-size: 0.82rem;
  opacity: 0.92;
}

.backdrop {
  display: none;
}

.main {
  min-width: 0;
  padding: 2rem 1.75rem 3rem 2.25rem;
}

.prose {
  max-width: 820px;
}

.prose .loading {
  color: var(--text-muted);
  font-style: italic;
}

.prose h1 {
  font-size: 2.35rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin: 0 0 1rem;
  line-height: 1.15;
  scroll-margin-top: calc(var(--header-h) + 1rem);
}

.prose h2 {
  font-size: 1.45rem;
  font-weight: 700;
  margin: 2.75rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
  scroll-margin-top: calc(var(--header-h) + 1rem);
  letter-spacing: -0.02em;
}

.prose h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 1.75rem 0 0.65rem;
  color: var(--text);
  scroll-margin-top: calc(var(--header-h) + 1rem);
}

.prose h4 {
  font-size: 1rem;
  font-weight: 600;
  margin: 1.25rem 0 0.5rem;
  color: var(--text-muted);
}

.prose p {
  margin: 0 0 1rem;
  color: var(--text-muted);
}

.prose strong {
  color: var(--text);
  font-weight: 600;
}

.prose a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(90, 175, 255, 0.35);
  transition: border-color var(--transition), color var(--transition);
}

.prose a:hover {
  border-bottom-color: var(--accent);
  color: #8cc8ff;
}

.prose hr {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-strong), transparent);
  margin: 2rem 0;
}

.prose ul,
.prose ol {
  margin: 0 0 1rem;
  padding-left: 1.35rem;
  color: var(--text-muted);
}

.prose li {
  margin: 0.35rem 0;
}

.prose li::marker {
  color: var(--accent);
}

.prose blockquote {
  margin: 1.25rem 0;
  padding: 0.85rem 1.1rem;
  border-left: 3px solid var(--accent);
  background: var(--surface);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-muted);
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 0.15em 0.45em;
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: #c8e4ff;
}

.prose pre {
  margin: 1.25rem 0;
  padding: 1rem 1.15rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow-x: auto;
  box-shadow: var(--shadow);
}

.prose pre code {
  padding: 0;
  background: none;
  border: none;
  font-size: 0.84rem;
  line-height: 1.55;
  color: var(--text);
}

/* Let highlight.js control token colors when active */
.prose pre code.hljs {
  color: #abb2bf;
  background: transparent;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
  font-size: 0.92rem;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}

.prose thead {
  background: var(--surface-elevated);
}

.prose th,
.prose td {
  padding: 0.65rem 0.85rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
}

.prose th {
  color: var(--text);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.prose tbody tr:hover {
  background: rgba(90, 175, 255, 0.05);
}

.prose tbody tr:last-child td {
  border-bottom: none;
}

.site-footer {
  max-width: 820px;
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.88rem;
  color: var(--text-faint);
}

.site-footer p {
  margin: 0;
}

.site-footer .serve-hint {
  margin-top: 0.65rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  opacity: 0.9;
}

/* Search modal */
.search-modal {
  position: fixed;
  inset: 0;
  z-index: 400;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 12vh 1rem 2rem;
  background: rgba(4, 8, 14, 0.72);
  backdrop-filter: blur(6px);
}

.search-modal[hidden] {
  display: none !important;
}

.search-dialog {
  width: min(560px, 100%);
  background: var(--surface-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.search-dialog-header {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border);
}

.search-dialog-header svg {
  flex-shrink: 0;
  color: var(--text-faint);
}

#search-input {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  outline: none;
}

#search-input::placeholder {
  color: var(--text-faint);
}

.search-results {
  max-height: min(340px, 50vh);
  overflow-y: auto;
  padding: 0.35rem;
}

.search-result {
  display: block;
  width: 100%;
  text-align: left;
  padding: 0.65rem 0.85rem;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: inherit;
  cursor: pointer;
  font-family: var(--font-sans);
  transition: background var(--transition);
}

.search-result:hover,
.search-result[aria-selected="true"] {
  background: var(--accent-soft);
}

.search-result-title {
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--text);
  margin-bottom: 0.2rem;
}

.search-result-meta {
  font-size: 0.75rem;
  color: var(--accent);
  margin-bottom: 0.25rem;
}

.search-result-snippet {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.search-empty {
  padding: 1.25rem;
  text-align: center;
  color: var(--text-faint);
  font-size: 0.9rem;
}

.search-hint {
  padding: 0.5rem 1rem 0.75rem;
  font-size: 0.72rem;
  color: var(--text-faint);
  border-top: 1px solid var(--border);
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .search-trigger .search-trigger-label {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .lang-switch-label {
    display: none;
  }

  .sidebar {
    position: fixed;
    top: var(--header-h);
    left: 0;
    width: min(300px, 88vw);
    max-height: calc(100vh - var(--header-h));
    z-index: 200;
    transform: translateX(-100%);
    transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow);
    background: var(--bg);
    border-right: 1px solid var(--border-strong);
  }

  .sidebar.is-open {
    transform: translateX(0);
  }

  .backdrop {
    display: block;
    position: fixed;
    inset: var(--header-h) 0 0 0;
    background: rgba(0, 0, 0, 0.55);
    z-index: 150;
    border: none;
    cursor: pointer;
  }

  .backdrop[hidden] {
    display: none !important;
  }

  .main {
    padding: 1.5rem 1.15rem 2.5rem;
  }

  .prose h1 {
    font-size: 1.85rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .sidebar {
    transition: none;
  }
}