/* ==========================================================================
   Root Theme Variables & Dark Overrides
   ========================================================================== */
:root {
  --site-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --header-height: 55px;
  --primary-accent: #dc2626;
  --primary-accent-hover: #b91c1c;
  --primary-accent-glow: rgba(0, 0, 0, 0.15);
  --primary-accent-subtle: rgba(220, 38, 38, 0.1);
  --selection-bg: rgba(220, 38, 38, 0.2);

  /* Dynamic Red Gradient for Headings (Light Mode) */
  --heading-gradient: linear-gradient(135deg, #dc2626 0%, #b91c1c 50%, #f87171 100%);

  /* Light Theme Defaults */
  --header-bg: var(--background, rgba(255, 255, 255, 0.92));
  --header-border: rgba(0, 0, 0, 0.08);
  --header-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  --header-text: var(--textColor, #1e293b);

  /* Smooth scroll & modern scrollbar */
  scrollbar-gutter: stable;
  scrollbar-color: rgba(150, 150, 150, 0.35) transparent;
}

/* Dark Mode Catch-All */
html[data-theme="dark"],
body[data-theme="dark"],
html[class*="dark"],
body[class*="dark"],
html.dark,
body.dark,
html.dark-mode,
body.dark-mode,
body[data-color-mode="dark"],
html[data-color-mode="dark"] {
  --primary-accent: #ef4444;
  --primary-accent-hover: #f87171;
  --primary-accent-glow: rgba(0, 0, 0, 0.35);
  --primary-accent-subtle: rgba(239, 68, 68, 0.15);
  --selection-bg: rgba(239, 68, 68, 0.3);

  /* Dynamic Vibrant Red Gradient for Headings (Dark Mode) */
  --heading-gradient: linear-gradient(135deg, #f87171 0%, #ef4444 50%, #fca5a5 100%);

  /* Dark Theme Header Values */
  --header-bg: var(--background, rgba(15, 23, 42, 0.92)) !important;
  --header-border: rgba(255, 255, 255, 0.08) !important;
  --header-shadow: 0 4px 16px rgba(0, 0, 0, 0.4) !important;
  --header-text: var(--textColor, #f1f5f9) !important;
  scrollbar-color: rgba(255, 255, 255, 0.2) transparent;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  overscroll-behavior-y: none;
  -webkit-tap-highlight-color: transparent;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body,
.sidebar,
.markdown-section {
  font-family: var(--site-font) !important;
}

/* ==========================================================================
   Gradient Red Headings (HTML & Markdown Compatible)
   ========================================================================== */
h1, h2, h3, h4,
.markdown-section h1,
.markdown-section h2,
.markdown-section h3,
.markdown-section h4 {
  background: var(--heading-gradient) !important;
  -webkit-background-clip: text !important;
  -webkit-text-fill-color: transparent !important;
  background-clip: text !important;
  color: transparent !important;
  display: inline-block;
  max-width: 100%;
}

/* Ensure links inside headings keep the gradient fill */
h1 a, h2 a, h3 a, h4 a,
.markdown-section h1 a,
.markdown-section h2 a,
.markdown-section h3 a,
.markdown-section h4 a {
  background: var(--heading-gradient) !important;
  -webkit-background-clip: text !important;
  -webkit-text-fill-color: transparent !important;
  background-clip: text !important;
  color: transparent !important;
  border-bottom: none !important;
}

/* Selection & Scrollbar Styling */
::selection {
  background-color: var(--selection-bg) !important;
  color: inherit;
}

::-moz-selection {
  background-color: var(--selection-bg) !important;
  color: inherit;
}

::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(150, 150, 150, 0.3);
  border-radius: 999px;
  border: 1px solid transparent;
  background-clip: padding-box;
  transition: background-color 0.2s ease;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-accent);
}

/* Scroll Progress Bar */
#scroll-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, #b91c1c, var(--primary-accent), #f87171);
  z-index: 10001;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
  transition: width 0.08s ease-out;
  pointer-events: none;
  transform: translateZ(0);
}

/* Hardware-Accelerated Smooth Color Transitions */
body,
.site-header,
#docsify-darklight-theme {
  transition: background-color 0.25s cubic-bezier(0.4, 0, 0.2, 1),
              color 0.25s cubic-bezier(0.4, 0, 0.2, 1),
              border-color 0.25s cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.app-name,
.sidebar>h1 {
  display: none !important;
}

/* Sidebar Layout & GPU-Driven Smooth Drawer Transition */
.sidebar {
  position: fixed;
  top: var(--header-height) !important;
  height: calc(100vh - var(--header-height)) !important;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  will-change: transform;
  transform: translate3d(0, 0, 0);
  transition: transform 0.35s cubic-bezier(0.32, 0.72, 0, 1),
              background-color 0.25s ease,
              border-color 0.25s ease !important;
}

.content {
  padding-top: var(--header-height) !important;
  transition: padding-left 0.35s cubic-bezier(0.32, 0.72, 0, 1),
              transform 0.35s cubic-bezier(0.32, 0.72, 0, 1) !important;
}

/* ==========================================================================
   Fixed Header (Light & Dark Compatible)
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  background-color: var(--header-bg) !important;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--header-shadow) !important;
  border-bottom: 1px solid var(--header-border) !important;
  z-index: 999 !important;
  transform: translateZ(0);
}

/* Header Left: Brand Logo + Text */
.site-header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none !important;
  transition: transform 0.18s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.18s ease;
  touch-action: manipulation;
}

.header-brand:hover {
  text-decoration: none !important;
  opacity: 0.9;
  transform: translateY(-1px);
}

.header-brand:active {
  transform: scale(0.97);
}

.header-logo {
  height: 26px;
  width: auto;
  object-fit: contain;
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.15));
}

.header-title {
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--header-text) !important;
  transition: color 0.25s ease;
  user-select: none;
}

.site-header-right {
  display: flex;
  align-items: center;
  gap: 10px;
  position: relative;
  height: 100%;
}

/* Sidebar Toggle Button inside Header */
.site-header .sidebar-toggle {
  position: static !important;
  display: flex !important;
  align-items: center;
  justify-content: center;
  width: 40px !important;
  height: 40px !important;
  padding: 0 !important;
  margin: 0 !important;
  background: transparent !important;
  border: none !important;
  outline: none !important;
  box-shadow: none !important;
  cursor: pointer;
  z-index: 101;
  touch-action: manipulation;
  transform: rotate(0deg) translateZ(0);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1) !important;
}

.site-header .sidebar-toggle:active {
  transform: scale(0.88);
}

.site-header .sidebar-toggle span {
  background-color: var(--header-text) !important;
  height: 2px !important;
  width: 18px !important;
  margin: 2px 0 !important;
  border-radius: 2px;
  transition: background-color 0.25s ease, transform 0.2s ease;
}

body.close .site-header .sidebar-toggle {
  transform: rotate(90deg) translateZ(0);
}

/* ==========================================================================
   Clean Markdown Links & Highlights
   ========================================================================== */
.markdown-section a {
  color: var(--primary-accent) !important;
  text-decoration: none !important;
  border-bottom: 1.5px solid transparent;
  padding-bottom: 1px;
  font-weight: 500;
  transition: border-color 0.18s ease, opacity 0.18s ease;
  touch-action: manipulation;
}

.markdown-section a:hover {
  border-bottom-color: var(--primary-accent);
  opacity: 0.9;
  text-decoration: none !important;
}

.markdown-section a:active {
  opacity: 0.75;
}

mark,
.markdown-section mark {
  background-color: var(--primary-accent-subtle);
  color: inherit;
  padding: 2px 6px;
  border-radius: 4px;
}

mark a,
.markdown-section mark a {
  color: var(--primary-accent) !important;
  font-weight: 600;
}

/* ==========================================================================
   Floating Dark/Light Toggle
   ========================================================================== */
#docsify-darklight-theme {
  position: fixed !important;
  right: 25px !important;
  bottom: 25px !important;
  top: auto !important;
  left: auto !important;
  z-index: 9999 !important;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.22) !important;
  border-radius: 50% !important;
  background-color: #1e293b !important;
  border: 1px solid rgba(255, 255, 255, 0.15) !important;
  touch-action: manipulation;
  transform: translateZ(0);
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1),
              box-shadow 0.2s ease,
              background-color 0.25s ease !important;
}

#docsify-darklight-theme:hover {
  transform: scale(1.08) translateZ(0);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35) !important;
}

#docsify-darklight-theme:active {
  transform: scale(0.92) translateZ(0) !important;
}

/* Moon Icon in Light Mode */
#docsify-darklight-theme svg {
  fill: #f1f5f9 !important;
  stroke: #f1f5f9 !important;
  transition: fill 0.25s ease, stroke 0.25s ease;
}

/* Dark Mode Button & Sun Icon Presentation */
body[class*="dark"] #docsify-darklight-theme,
html[class*="dark"] #docsify-darklight-theme,
body.dark #docsify-darklight-theme,
[data-theme="dark"] #docsify-darklight-theme,
body.dark-mode #docsify-darklight-theme,
html[data-theme="dark"] #docsify-darklight-theme {
  background-color: #1e293b !important;
  border: 1px solid rgba(255, 255, 255, 0.18) !important;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.45) !important;
}

/* High-contrast golden/yellow Sun Icon in Dark Mode */
body[class*="dark"] #docsify-darklight-theme svg,
html[class*="dark"] #docsify-darklight-theme svg,
body.dark #docsify-darklight-theme svg,
[data-theme="dark"] #docsify-darklight-theme svg,
body.dark-mode #docsify-darklight-theme svg,
html[data-theme="dark"] #docsify-darklight-theme svg {
  fill: #facc15 !important;
  stroke: #facc15 !important;
}

/* Sidebar Navigation */
.sidebar-nav li a {
  transition: color 0.15s ease, background-color 0.15s ease;
  touch-action: manipulation;
}

.sidebar-nav li a:hover {
  color: var(--primary-accent) !important;
}

.sidebar-nav li a:active {
  opacity: 0.8;
}

.sidebar-nav li.active>a {
  color: var(--primary-accent) !important;
  font-weight: 600;
  border-right: 2px solid var(--primary-accent);
}

.sidebar-nav li {
  position: relative !important;
}

.sidebar-nav li>p,
.sidebar-nav li>a,
.sidebar-nav li>span {
  display: flex !important;
  align-items: center !important;
  justify-content: space-between !important;
  width: 100% !important;
}

.sidebar-nav li.collapse::before,
.sidebar-nav li.folder::before,
.sidebar-nav .folder::before,
.sidebar-nav .collapse::before {
  left: auto !important;
  right: 18px !important;
  position: absolute !important;
}

.sidebar-nav li.collapse>a,
.sidebar-nav li.folder>a {
  padding-left: 0 !important;
  padding-right: 28px !important;
}

.sidebar-nav .folder,
.sidebar-nav .collapse,
.sidebar-nav span.folder,
.sidebar-nav span.collapse {
  order: 2 !important;
  margin-left: auto !important;
  margin-right: 14px !important;
  left: auto !important;
}

/* Sandbox Modal */
.sandbox-modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.5);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.sandbox-modal-backdrop.active {
  display: flex !important;
}

.sandbox-modal {
  background: var(--header-bg);
  border: 1px solid var(--header-border);
  border-radius: 12px;
  padding: 24px;
  width: 90%;
  max-width: 400px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
  color: var(--header-text);
  transform: translateZ(0);
}

.sandbox-modal-btn {
  padding: 7px 16px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  font-weight: 600;
  touch-action: manipulation;
  transition: transform 0.15s ease, opacity 0.15s ease;
}

.sandbox-modal-btn:active {
  transform: scale(0.95);
}

/* App Loader */
.app-loader {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 85vh;
  font-family: var(--site-font);
}

.loader-spinner {
  width: 44px;
  height: 44px;
  border: 3.5px solid rgba(0, 0, 0, 0.1);
  border-top-color: var(--primary-accent);
  border-radius: 50%;
  animation: spin 0.85s linear infinite;
  margin-bottom: 16px;
  will-change: transform;
}

.loader-text {
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.3px;
  opacity: 0.85;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Footer & Attribution */
.site-footer {
  margin-top: 48px;
  padding: 18px 0 26px;
  font-size: 0.875rem;
  text-align: center;
  opacity: 0.8;
  border-top: 1px solid rgba(125, 125, 125, 0.15);
  user-select: none;
}

.site-footer .heart {
  color: var(--primary-accent);
  display: inline-block;
  margin: 0 2px;
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.site-footer .heart:hover {
  transform: scale(1.25);
}