:root,
[data-theme="dark"] {
  --bg-primary: #111827;
  --bg-secondary: #1f2937;
  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  --border-color: #374151;
  --code-bg: #000000;

  --theme-primary: #8b5cf6;
  --theme-primary-rgb: 139, 92, 246;
  --theme-hover: #7c3aed;
  --theme-hover-rgb: 124, 58, 237;
  --theme-border: #7f00ff;
}

/* --- Light Theme --- */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #e2e8f0;
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --border-color: #cbd5e1;
  --code-bg: #1e293b;
}

/* --- Base --- */
body {
  font-family: "Inter", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
  margin: 0;
  padding: 0;
}

.app-layout {
  display: flex;
  min-height: 100vh;
}

/* --- Section Title / Page Heading --- */
.section-title {
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
}
.page-heading {
  font-family: "Montserrat", sans-serif;
  font-weight: 800;
  color: var(--text-primary);
}

/* --- Card --- */
.card {
  background-color: var(--bg-secondary);
  border-radius: 0.5rem;
  padding: 1.5rem;
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
}

/* --- Code Block --- */
.code-block {
  background-color: var(--code-bg);
  color: var(--text-secondary);
  padding: 1rem;
  border-radius: 0.375rem;
  font-family: monospace;
  overflow-x: auto;
  vertical-align: middle;
}

/* Light mode: ensure code text is readable */
[data-theme="light"] .code-block {
  color: #e2e8f0;
}

/* --- Buttons --- */
.btn-primary {
  background-color: transparent;
  color: var(--text-primary);
  border: 2px solid var(--theme-primary);
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  transition: background-color 0.3s ease, transform 0.1s ease;
  cursor: pointer;
}
.btn-primary:hover {
  background-color: rgba(var(--theme-primary-rgb), 0.2);
  transform: translateY(-1px);
}
.btn-primary:active {
  transform: translateY(0);
}

/* ============================================
   SIDEBAR
   ============================================ */
#sidebar {
  width: 280px;
  min-width: 280px;
  height: 100vh;
  position: sticky;
  top: 0;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-primary);
  border-right: 1px solid var(--border-color);
  z-index: 50;
  overflow: hidden;
  transition: transform 0.3s ease-in-out, background-color 0.3s ease;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 16px 12px;
  border-bottom: 1px solid var(--border-color);
}
.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo-img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}
.logo-text {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}
.logo-badge {
  font-size: 0.6rem;
  font-weight: 700;
  padding: 2px 6px;
  background: rgba(var(--theme-primary-rgb), 0.2);
  color: var(--theme-primary);
  border-radius: 4px;
  letter-spacing: 0.5px;
}
.sidebar-close {
  display: none;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
  transition: background 0.15s ease;
}
.sidebar-close:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

/* --- Sidebar Search (BUG FIX: Ctrl+K overflow) --- */
.sidebar-search-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 12px 12px 8px;
  padding: 8px 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  cursor: pointer;
  transition: border-color 0.15s ease;
  overflow: hidden;       /* FIX: prevents badge overflow */
  box-sizing: border-box; /* FIX: include padding in width */
}
.sidebar-search-wrapper:hover {
  border-color: var(--theme-primary);
}
.search-icon {
  color: var(--text-secondary);
  flex-shrink: 0;
}
.sidebar-search {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
  min-width: 0; /* FIX: allows text to truncate instead of pushing badge out */
  overflow: hidden;
  text-overflow: ellipsis;
}
.search-kbd {
  font-size: 0.65rem;
  padding: 2px 5px;
  background: var(--bg-primary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-family: inherit;
  white-space: nowrap;
  flex-shrink: 0; /* FIX: prevents badge from shrinking */
  line-height: 1;
}

/* --- Sidebar Navigation --- */
.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 8px 12px;
}
.sidebar-nav::-webkit-scrollbar {
  width: 4px;
}
.sidebar-nav::-webkit-scrollbar-track {
  background: transparent;
}
.sidebar-nav::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

/* --- Sidebar Links --- */
.sidebar-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 6px;
  font-size: 0.9rem;
  transition: color 0.2s ease, background-color 0.2s ease, border-left 0.2s ease;
  border-left: 3px solid transparent;
  margin-bottom: 1px;
}
.sidebar-link:hover {
  color: var(--theme-primary);
  background-color: rgba(var(--theme-primary-rgb), 0.1);
  text-decoration: none;
}
.sidebar-link.active {
  color: var(--theme-primary);
  background-color: rgba(var(--theme-primary-rgb), 0.15);
  font-weight: 700;
  border-left: 3px solid var(--theme-primary);
}
.sidebar-link.sidebar-parent-active {
  background-color: rgba(var(--theme-primary-rgb), 0.1);
  color: var(--theme-primary);
  font-weight: 700;
  border-left: 3px solid var(--theme-primary);
}
.sidebar-link svg {
  flex-shrink: 0;
  opacity: 0.7;
}
.sidebar-link:hover svg,
.sidebar-link.active svg,
.sidebar-link.sidebar-parent-active svg {
  opacity: 1;
}

/* --- Sidebar Collapsible Sections --- */
.sidebar-section {
  margin-bottom: 2px;
}
.sidebar-section-header {
  display: flex;
  align-items: center;
}
.sidebar-section-header .sidebar-link {
  flex: 1;
}
.sidebar-toggle {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 6px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.25s ease, color 0.15s ease;
}
.sidebar-toggle:hover {
  color: var(--text-primary);
  background: rgba(255,255,255,0.05);
}
.sidebar-toggle.expanded svg {
  transform: rotate(180deg);
}

.sidebar-children {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-in-out;
  margin-left: 16px;
  padding-left: 8px;
  border-left: 1px solid rgba(var(--theme-primary-rgb), 0.15);
}
.sidebar-children.expanded {
  max-height: 1000px;
}
.sidebar-child {
  font-size: 0.85rem;
  padding: 6px 12px;
}

.sidebar-divider {
  height: 1px;
  background: var(--border-color);
  margin: 8px 0;
}

/* --- Sidebar Footer --- */
.sidebar-footer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 12px;
  border-top: 1px solid var(--border-color);
}
.sidebar-footer-link {
  color: var(--text-secondary);
  transition: color 0.15s ease;
  display: flex;
}
.sidebar-footer-link:hover {
  color: var(--theme-primary);
}

/* --- Sidebar Mobile --- */
@media (max-width: 1023px) {
  #sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: 80%;
    max-width: 300px;
    z-index: 999;
    transform: translateX(-100%);
    background-color: var(--bg-primary);
  }
  #sidebar.open {
    transform: translateX(0);
  }
  .sidebar-close {
    display: flex;
  }
}
@media (min-width: 1024px) {
  #sidebar {
    position: sticky;
    transform: translateX(0);
  }
}

#sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(0,0,0,0.5);
  backdrop-filter: blur(2px);
  z-index: 998;
}
#sidebar-overlay.show {
  display: block;
}

/* ============================================
   MAIN CONTENT
   ============================================ */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background-color: var(--bg-primary);
  transition: background-color 0.3s ease;
}

/* --- Header --- */
.main-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  position: sticky;
  top: 0;
  z-index: 40;
  transition: background-color 0.3s ease;
}
.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}
.header-brand {
  font-weight: 700;
  font-size: 1rem;
  color: var(--theme-primary);
}
.header-separator {
  color: var(--border-color);
  font-weight: 300;
}
.header-title {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text-secondary);
}
.header-right {
  display: flex;
  align-items: center;
  gap: 4px;
}
.hamburger-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
}
.hamburger-btn:hover {
  background: var(--bg-secondary);
}
@media (max-width: 1023px) {
  .hamburger-btn {
    display: flex;
  }
}

/* --- Dark/Light Theme Toggle --- */
.theme-toggle-btn {
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  transition: background 0.15s ease;
}
.theme-toggle-btn:hover {
  background: var(--bg-secondary);
}
/* In dark mode: show sun, hide moon */
[data-theme="dark"] .theme-icon-sun {
  display: block;
}
[data-theme="dark"] .theme-icon-moon {
  display: none;
}
/* In light mode: show moon, hide sun */
[data-theme="light"] .theme-icon-sun {
  display: none;
}
[data-theme="light"] .theme-icon-moon {
  display: block;
}

/* ============================================
   BREADCRUMB NAVIGATION
   ============================================ */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 24px;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.8rem;
  background: var(--bg-primary);
  transition: background-color 0.3s ease;
}
.breadcrumb-link {
  color: var(--text-secondary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  transition: color 0.15s ease;
}
.breadcrumb-link:hover {
  color: var(--theme-primary);
  text-decoration: none;
}
.breadcrumb-separator {
  color: var(--text-muted, #64748b);
  display: flex;
  align-items: center;
}
.breadcrumb-current {
  color: var(--text-primary);
  font-weight: 600;
}
.breadcrumb-parent {
  cursor: pointer;
}
.breadcrumb-parent:hover {
  color: var(--theme-primary);
}

/* --- Content Display --- */
.content-display {
  flex: 1;
  padding: 2rem;
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
}
@media (max-width: 768px) {
  .content-display {
    padding: 1rem;
  }
}

/* --- Footer --- */
.main-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-secondary);
}
.main-footer a {
  color: var(--theme-primary);
  text-decoration: none;
}
.main-footer a:hover {
  text-decoration: underline;
}

/* ============================================
   SETTINGS DROPDOWN
   ============================================ */
.settings-wrapper {
  position: relative;
}
.settings-btn {
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  transition: background 0.15s ease;
}
.settings-btn:hover {
  background: var(--bg-secondary);
}
.settings-dropdown {
  display: none;
  position: absolute;
  right: 0;
  top: 100%;
  margin-top: 8px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 16px;
  min-width: 180px;
  box-shadow: 0 8px 16px rgba(0,0,0,0.3);
  z-index: 50;
}
.settings-dropdown.show {
  display: block;
}
.settings-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  margin-bottom: 10px;
}
.color-swatches {
  display: flex;
  gap: 8px;
}
.color-swatch {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: border-color 0.2s ease, transform 0.1s ease;
}
.color-swatch:hover {
  transform: scale(1.15);
}
.color-swatch.active {
  border-color: var(--text-primary);
  box-shadow: 0 0 0 2px rgba(var(--theme-primary-rgb), 0.3);
}

/* ============================================
   SEARCH OVERLAY / MODAL
   ============================================ */
.search-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0,0,0,0.8);
  backdrop-filter: blur(4px);
  display: flex;
  justify-content: center;
  align-items: flex-start;
  z-index: 100;
  padding-top: 10vh;
}
.search-modal {
  background-color: var(--bg-secondary);
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
  width: 90%;
  max-width: 600px;
  border: 1px solid var(--border-color);
  overflow: hidden;
}
.search-modal-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
}
.search-modal-input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 1rem;
}
.search-results {
  max-height: 400px;
  overflow-y: auto;
  padding: 8px;
}
.search-result-item {
  padding: 12px 16px;
  cursor: pointer;
  border-radius: 8px;
  transition: background-color 0.15s ease;
  margin-bottom: 2px;
}
.search-result-item:hover {
  background-color: rgba(var(--theme-primary-rgb), 0.1);
}
.search-result-item .title {
  font-weight: 600;
  color: var(--text-primary);
}
.search-result-item .snippet {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ============================================
   SCROLL TO TOP
   ============================================ */
.scroll-to-top {
  display: flex;
  align-items: center;
  justify-content: center;
  position: fixed;
  bottom: 20px;
  right: 30px;
  z-index: 99;
  border: none;
  outline: none;
  background-color: var(--theme-primary);
  color: white;
  cursor: pointer;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  box-shadow: 0 4px 12px rgba(var(--theme-primary-rgb), 0.3);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.3s ease, transform 0.3s ease, background-color 0.3s ease;
}
.scroll-to-top.show {
  opacity: 1;
  transform: translateY(0);
}
.scroll-to-top:hover {
  background-color: var(--theme-hover);
  transform: translateY(-2px);
}
.scroll-to-top:active {
  transform: translateY(0);
}

/* ============================================
   READING PROGRESS BAR
   ============================================ */
#reading-progress-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: transparent;
  z-index: 9999;
}
#reading-progress-bar {
  height: 100%;
  width: 0%;
  background-color: var(--theme-primary);
  transition: width 0.1s linear;
  border-radius: 0 2px 2px 0;
  box-shadow: 0 0 10px rgba(var(--theme-primary-rgb), 0.5);
}

/* ============================================
   FAQ ACCORDION
   ============================================ */
.faq-item {
  background-color: var(--bg-secondary);
  border-radius: 0.75rem;
  margin-bottom: 1rem;
  overflow: hidden;
  box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  border: 1px solid var(--border-color);
  transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out, border-color 0.2s ease-in-out;
}
.faq-item:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 15px rgba(0,0,0,0.3);
  border-color: var(--theme-primary);
}
.faq-question {
  width: 100%;
  padding: 1.25rem 1.5rem;
  text-align: left;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  background-color: transparent;
  border: none;
  transition: color 0.2s ease-in-out, background-color 0.2s ease-in-out;
}
.faq-question:hover {
  color: var(--theme-primary);
}
.faq-question.open {
  background-color: rgba(var(--theme-primary-rgb), 0.1);
  color: var(--theme-primary);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease-in-out, padding 0.4s ease-in-out;
  padding: 0 1.5rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}
.faq-answer.open {
  max-height: 500px;
  padding-bottom: 1.5rem;
}
.faq-question svg {
  transition: transform 0.3s ease-in-out;
}
.faq-question.open svg {
  transform: rotate(180deg);
  color: var(--theme-primary);
}

/* ============================================
   CHANGELOG TAGS
   ============================================ */
.changelog-tag {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.625rem;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 9999px;
  margin-bottom: 0.5rem;
  margin-top: 0.25rem;
  line-height: 1.25rem;
}
.changelog-tag-new {
  background-color: rgba(74, 222, 128, 0.1);
  color: #86efac;
  border: 1px solid rgba(74, 222, 128, 0.2);
}
.changelog-tag-new svg { color: #86efac; }

.changelog-tag-improvement {
  background-color: rgba(96, 165, 250, 0.1);
  color: #93c5fd;
  border: 1px solid rgba(96, 165, 250, 0.2);
}
.changelog-tag-improvement svg { color: #93c5fd; }

.changelog-tag-security {
  background-color: rgba(248, 113, 113, 0.1);
  color: #fca5a5;
  border: 1px solid rgba(248, 113, 113, 0.2);
}
.changelog-tag-security svg { color: #fca5a5; }

.changelog-tag-relaunch {
  background-color: rgba(251, 191, 36, 0.1);
  color: #fcd34d;
  border: 1px solid rgba(251, 191, 36, 0.2);
}
.changelog-tag-relaunch svg { color: #fcd34d; }

.changelog-tag-bugfix {
  background-color: #fce8e6;
  color: #c53929;
  border: 1px solid #c53929;
}
.changelog-tag-bugfix svg { color: #c53929; }

/* Light mode changelog adjustments */
[data-theme="light"] .changelog-tag-new { color: #16a34a; border-color: #16a34a; background-color: rgba(22,163,74,0.1); }
[data-theme="light"] .changelog-tag-new svg { color: #16a34a; }
[data-theme="light"] .changelog-tag-improvement { color: #2563eb; border-color: #2563eb; background-color: rgba(37,99,235,0.1); }
[data-theme="light"] .changelog-tag-improvement svg { color: #2563eb; }
[data-theme="light"] .changelog-tag-security { color: #dc2626; border-color: #dc2626; background-color: rgba(220,38,38,0.1); }
[data-theme="light"] .changelog-tag-security svg { color: #dc2626; }
[data-theme="light"] .changelog-tag-relaunch { color: #d97706; border-color: #d97706; background-color: rgba(217,119,6,0.1); }
[data-theme="light"] .changelog-tag-relaunch svg { color: #d97706; }

/* ============================================
   UTILITY
   ============================================ */
.hidden {
  display: none !important;
}

/* Light mode overrides for Tailwind content classes */
[data-theme="light"] .text-gray-300 {
  color: #475569 !important;
}
[data-theme="light"] .text-gray-400 {
  color: #64748b !important;
}
[data-theme="light"] .text-white {
  color: #1e293b !important;
}