/* CSS RESET (Enhanced) */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  /* Prevent horizontal scroll from side panel transitions */
}

@supports (font-variation-settings: normal) {
  body {
    font-family: 'Inter var', sans-serif;
  }
}

/* THEME VARIABLES */
:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, Courier, monospace;

  --radius-xs: 0.125rem;
  /* 2px */
  --radius-sm: 0.25rem;
  /* 4px */
  --radius-md: 0.5rem;
  /* 8px */
  --radius-lg: 0.75rem;
  /* 12px */
  --radius-xl: 1rem;
  /* 16px */

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  --transition-short: 150ms;
  --transition-base: 250ms;
  --transition-long: 400ms;

  --sidebar-width: 260px;
  --sidebar-width-collapsed: 70px;
  --header-height: 64px;
}

html[data-theme="light"] {
  --bg-app: #f7f8fc;
  /* Overall app background */
  --bg-primary: #ffffff;
  /* Cards, sidebar, header */
  --bg-secondary: #f0f2f5;
  /* Input fields, subtle hover, active states */
  --bg-tertiary: #e9ecef;
  --text-primary: #212529;
  --text-secondary: #495057;
  --text-muted: #6c757d;
  --border-primary: #dee2e6;
  --border-secondary: #e9ecef;
  --accent-color: #0d6efd;
  --accent-color-hover: #0b5ed7;
  --accent-text-interactive: #ffffff;
  --success-color: #198754;
  --warning-color: #ffc107;
  --warning-text: #664d03;
  /* Darker text for light yellow */
  --error-color: #dc3545;
  color-scheme: light;
}

html[data-theme="dark"] {
  --bg-app: #121212;
  --bg-primary: #1e1e1e;
  --bg-secondary: #2c2c2c;
  --bg-tertiary: #3a3a3a;
  --text-primary: #e8eaed;
  --text-secondary: #bdc1c6;
  --text-muted: #9aa0a6;
  --border-primary: #424242;
  --border-secondary: #303030;
  --accent-color: #3b82f6;
  --accent-color-hover: #2563eb;
  --accent-text-interactive: #ffffff;
  --success-color: #22c55e;
  --warning-color: #f59e0b;
  --warning-text: #fde68a;
  /* Lighter text for dark yellow */
  --error-color: #ef4444;
  color-scheme: dark;
}

/* BASE STYLES */
body {
  background-color: var(--bg-app);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 15px;
  /* Slightly smaller base for more info density */
  transition: background-color var(--transition-base), color var(--transition-base);
}

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

/* SIDEBAR NAVIGATION */
.app-sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-primary);
  border-right: 1px solid var(--border-primary);
  display: flex;
  flex-direction: column;
  padding: 1rem 0;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 1000;
  transition: width var(--transition-base) ease-in-out, padding var(--transition-base) ease-in-out;
  overflow-y: auto;
  overflow-x: hidden;
}

.app-sidebar.collapsed {
  width: var(--sidebar-width-collapsed);
  padding: 1rem 0.25rem;
}

.sidebar-header {
  padding: 0.5rem 1rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  /* For toggle and logo */
}

.sidebar-header .logo-icon svg {
  width: 32px;
  height: 32px;
  fill: var(--accent-color);
  transition: opacity var(--transition-base);
}

.app-sidebar.collapsed .sidebar-header .logo-icon svg {
  margin: 0 auto;
  /* Center when collapsed */
}

.sidebar-title {
  font-size: 1.2em;
  font-weight: 700;
  color: var(--text-primary);
  opacity: 1;
  transition: opacity var(--transition-short) ease var(--transition-short);
  /* Fade out slighty after width collapse */
}

.app-sidebar.collapsed .sidebar-title {
  display: none;
}

.sidebar-toggle-btn {
  /* Positioned in sidebar now if header is removed from main content */
  background: none;
  border: none;
  color: var(--text-secondary);
  padding: 0.5rem;
  cursor: pointer;
  margin-left: auto;
  /*Push it to the right */
  display: flex;
}

.sidebar-toggle-btn svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
}

.app-sidebar.collapsed .sidebar-toggle-btn {
  margin-left: 0
}

/* Center when collapsed */


.sidebar-nav {
  flex-grow: 1;
}

.nav-list {
  list-style: none;
}

.nav-item .nav-link {
  display: flex;
  align-items: center;
  padding: 0.75rem 1.5rem;
  /* More padding */
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  margin: 0.25rem 0.75rem;
  font-weight: 500;
  transition: background-color var(--transition-short), color var(--transition-short);
  white-space: nowrap;
  overflow: hidden;
}

.nav-item .nav-link svg {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-right: 0.75rem;
  stroke-width: 1.5;
  /* For outline icons */
  transition: margin-right var(--transition-base) ease-in-out;
}

.app-sidebar.collapsed .nav-item .nav-link {
  padding: 0.75rem;
  /* Adjust padding to center icon */
  justify-content: center;
  /* Center icon */
}

.app-sidebar.collapsed .nav-item .nav-link svg {
  margin-right: 0;
}

.app-sidebar.collapsed .nav-item .nav-link .link-text {
  display: none;
}

.nav-item .nav-link:hover {
  background-color: var(--bg-secondary);
  color: var(--accent-color);
}

.nav-item .nav-link.active {
  background-color: var(--accent-color);
  color: var(--accent-text-interactive);
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

/* Sidebar controls (theme, copy) */
.sidebar-controls {
  padding: 1rem 0.75rem;
  border-top: 1px solid var(--border-secondary);
}

.sidebar-controls .icon-btn {
  width: 100%;
  justify-content: flex-start;
  padding: 0.75rem 1rem;
}

.app-sidebar.collapsed .sidebar-controls .icon-btn {
  padding: 0.75rem;
  justify-content: center;
}

.app-sidebar.collapsed .sidebar-controls .icon-btn .btn-text {
  display: none;
}


/* MAIN CONTENT AREA (adjusted for sidebar) */
.app-content-wrapper {
  margin-left: var(--sidebar-width);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  transition: margin-left var(--transition-base) ease-in-out;
}

.app-sidebar.collapsed~.app-content-wrapper {
  margin-left: var(--sidebar-width-collapsed);
}

/* HEADER (in content wrapper for simplicity or removed if sidebar handles all ) */
.page-header {
  background-color: var(--bg-primary);
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-primary);
  position: sticky;
  top: 0;
  /* sticky page header if needed, or can be removed */
  z-index: 900;
  /* Below sidebar */
  height: var(--header-height);
}

.page-header h1 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text_primary);
}

.mobile-sidebar-toggle {
  display: none;
  /* for mobile hamburger */
}


.app-main-content {
  flex-grow: 1;
  padding: 1.5rem;
  max-width: 100%;
  /* Takes full width */
}

.global-disclaimer {
  /* Same as before, slightly adjusted */
  background-color: color-mix(in srgb, var(--warning-color) 20%, var(--bg-primary));
  color: var(--warning-text);
  padding: 1rem;
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
  border: 1px solid var(--warning-color);
  font-size: 0.9em;
  text-align: center;
}

html[data-theme="dark"] .global-disclaimer {
  background-color: color-mix(in srgb, var(--warning-color) 20%, var(--bg-primary));
}

.global-disclaimer strong {
  font-weight: 600;
}

/* TAB PANELS (now just sections) */
.content-panel {
  display: none;
  animation: fadeInContent 0.5s ease-out .1s;
  animation-fill-mode: backwards;
}

/* slight delay */
.content-panel.active {
  display: block;
}

@keyframes fadeInContent {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.content-section h2 {
  /* Main titles for subsections within a panel */
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 1.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-secondary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.content-section:first-child h2 {
  margin-top: 0;
}

/* CARD LAYOUT (Mostly same, minor refinements) */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
  /* Slightly more gap */
  margin-bottom: 1.5rem;
}

.info-card {
  background-color: var(--bg-primary);
  padding: 1.25rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid transparent;
  /* border for focus/hover */
  transition: background-color var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  display: flex;
  flex-direction: column;
}

.info-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  border-color: var(--accent-color);
}

.info-card.full-span {
  grid-column: 1 / -1;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.card-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.card-value {
  font-size: 1.05em;
  font-weight: 600;
  color: var(--text-primary);
  word-break: break-word;
  margin-top: 0.25rem;
  flex-grow: 1;
}

.card-value.code-text {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background-color: var(--bg-secondary);
  padding: 0.75rem;
  border-radius: var(--radius-md);
  max-height: 150px;
  /* Increased height for more text */
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-all;
  border: 1px solid var(--border-secondary);
}

.card-description {
  font-size: 0.875em;
  color: var(--text-secondary);
  margin-top: 0.75rem;
  line-height: 1.5;
}

.info-card.text-only-card .card-value {
  font-weight: normal;
  font-size: 0.95em;
  color: var(--text-secondary);
}

/* Status indicators within cards (Semantic + colors) */
.value-success {
  color: var(--success-color) !important;
}

.value-warning {
  color: var(--warning-color) !important;
}

.value-error {
  color: var(--error-color) !important;
}

/* Action Buttons */
.action-btn {
  background-color: var(--accent-color);
  color: var(--accent-text-interactive);
  border: none;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 0.9em;
  font-weight: 500;
  transition: background-color var(--transition-short), transform var(--transition-short);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.action-btn svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.action-btn:hover {
  background-color: var(--accent-color-hover);
}

.action-btn:active {
  transform: scale(0.97);
}

.action-btn:disabled {
  background-color: var(--text-muted);
  cursor: not-allowed;
  opacity: 0.6;
}

.action-btn-secondary {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-primary);
}

.action-btn-secondary:hover {
  background-color: var(--bg-tertiary);
}


/* SPECIFIC ELEMENT STYLES (e.g., visualizer, progress bar - slightly refined) */
#fps-visualizer {
  border: 1px solid var(--border-secondary);
  margin-top: 0.75rem;
  border-radius: var(--radius-md);
  background-color: var(--bg-secondary);
  width: 100%;
  height: 60px;
  display: block;
}

.progress-bar-container {
  width: 100%;
  background-color: var(--bg-secondary);
  border-radius: var(--radius-md);
  margin-top: 0.75rem;
  overflow: hidden;
  height: 0.75rem;
  border: 1px solid var(--border-secondary);
}

.progress-bar {
  width: 0%;
  height: 100%;
  background-color: var(--accent-color);
  transition: width var(--transition-short) ease-out, background-color var(--transition-short);
  border-radius: var(--radius-md);
}

.list-display-container {
  background-color: var(--bg-secondary);
  padding: 1rem;
  border-radius: var(--radius-md);
  margin-top: 0.75rem;
  border: 1px solid var(--border-secondary);
}

.list-item {
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border-primary);
  font-size: 0.9em;
}

.list-item:last-child {
  border-bottom: none;
}

.list-item strong {
  font-weight: 500;
  color: var(--text-primary);
}

.list-item code {
  font-family: var(--font-mono);
  background-color: var(--bg-tertiary);
  padding: 0.15rem 0.35rem;
  border-radius: var(--radius-sm);
  font-size: 0.9em;
}


/* FOOTER (in content wrapper) */
.app-main-footer {
  text-align: center;
  padding: 1.5rem;
  font-size: 0.9em;
  color: var(--text-muted);
  border-top: 1px solid var(--border-primary);
  margin-top: 2rem;
  background-color: var(--bg-primary);
}

/* TOOLTIP (Same) */
#tooltip {
  position: absolute;
  background-color: #212529;
  color: #f8f9fa;
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.8em;
  z-index: 10001;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-short), transform var(--transition-short);
  transform: translateY(5px);
}

#tooltip.visible {
  opacity: 1;
  transform: translateY(0);
}

/* RESPONSIVE ADJUSTMENTS FOR SIDEBAR & CONTENT */
@media (max-width: 768px) {

  /* Sidebar becomes overlay or is hidden, toggled by hamburger */
  .app-sidebar {
    position: fixed;
    left: -100%;
    /* Hide off-screen */
    box-shadow: var(--shadow-xl);
    transition: left var(--transition-base) ease-in-out, width var(--transition-base) ease-in-out,
      padding var(--transition-base) ease-in-out;
    height: 100vh;
    /* Ensure full height */
  }

  .app-sidebar.open {
    left: 0;
    width: var(--sidebar-width);
    /* Show sidebar */
  }

  .app-sidebar.collapsed {
    left: -100%;
    /* Keep collapsed version off-screen too, unless explicitly toggled */
  }

  .app-sidebar.open.collapsed {
    width: var(--sidebar-width);
  }

  /* Re-open if it was collapsed. */

  .app-content-wrapper {
    margin-left: 0 !important;
    /* Content takes full width */
  }

  .mobile-sidebar-toggle {
    display: inline-flex;
    /* Show hamburger */
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: 0.5rem;
    cursor: pointer;
  }

  .mobile-sidebar-toggle svg {
    width: 24px;
    height: 24px;
    fill: currentColor;
  }

  .sidebar-title {
    display: block !important;
  }

  /* Always show title in mobile if opened */
  .app-sidebar.open .nav-item .nav-link .link-text,
  .app-sidebar.open .sidebar-controls .icon-btn .btn-text {
    display: inline-block;
  }

  .app-sidebar.open .nav-item .nav-link svg {
    margin-right: 0.75rem;
  }

  .app-sidebar.open .nav-item .nav-link {
    justify-content: flex-start;
  }

  .page-header h1 {
    font-size: 1.2rem;
  }

  .app-main-content {
    padding: 1rem;
  }

  .info-grid {
    grid-template-columns: 1fr;
  }

  /* Stack cards on mobile */
}