/* Global Styles */
:root {
  /* Light Theme (Default) - WARMER VERSION */
  --color-background: #FAF7F2; 
  --color-surface: #ffffff;    
  --color-text-primary: #13292A; 
  --color-text-secondary: #5a5349; 
  --color-text-on-primary: #ffffff;
  --color-text-on-badge: #ffffff;
  --color-primary: #005f73;    
  --color-secondary-bg: #E8DACC; 
  --color-secondary-text: #4A443D; 
  --color-border: #E0D8CC;      
  --color-shadow: rgba(80, 70, 60, 0.09); 
  --color-hero-overlay-bg: rgba(250, 247, 242, 0.4); 
  --color-hero-text: #002d37;    
  --color-hero-button-bg: #007991;
  --color-hero-button-text: #ffffff;
  --color-diff-added-bg: #e6ffed; 
  --color-diff-added-text: #1e4620;
  --color-diff-removed-bg: #ffebee;
  --color-diff-removed-text: #6d1c1f;
  --color-skeleton-base: #EFEAE0;   
  --color-skeleton-highlight: #F8F5EF;
  --color-link: var(--color-primary);
  --color-link-hover: #004c5d;
  /* Notification colors */
  --color-flash-default-bg: var(--color-secondary-bg);
  --color-flash-default-text: var(--color-secondary-text);
  --color-flash-default-border: var(--color-border);
  --color-flash-error-bg: var(--color-diff-removed-bg);
  --color-flash-error-text: var(--color-diff-removed-text);
  --color-flash-error-border: color-mix(in srgb, var(--color-diff-removed-bg) 80%, black);
  --color-flash-success-bg: var(--color-diff-added-bg);
  --color-flash-success-text: var(--color-diff-added-text);
  --color-flash-success-border: color-mix(in srgb, var(--color-diff-added-bg) 80%, black);
  --color-flash-warning-bg: #fff3cd; 
  --color-flash-warning-text: #856404;
  --color-flash-warning-border: #ffeeba;
  --color-table-border: var(--color-border); 
}

body[data-theme="dark"] {
  --color-background: #222831;
  --color-surface: #393E46;
  --color-text-primary: #DFD0B8;
  --color-text-secondary: #948979;
  --color-text-on-primary: #FFFFFF;
  --color-text-on-badge: #FFFFFF;
  --color-primary: #76ABAE; /* Muted Teal */
  --color-secondary-bg: #525A65; /* Neutral Mid-Grey */
  --color-secondary-text: #DFD0B8;
  --color-border: #4A4F58; /* Cool Grey Border */
  --color-shadow: rgba(0, 0, 0, 0.4);
  --color-hero-overlay-bg: rgba(34, 40, 49, 0.75); /* Based on #222831 */
  --color-hero-text: #DFD0B8;
  --color-hero-button-bg: var(--color-primary);
  --color-hero-button-text: #FFFFFF;
  --color-diff-added-bg: #2E453E; /* Dark Desaturated Green */
  --color-diff-added-text: #A8D8B9; /* Light Muted Green */
  --color-diff-removed-bg: #4A3136; /* Dark Desaturated Red */
  --color-diff-removed-text: #E8ACB3; /* Light Muted Red */
  --color-skeleton-base: #393E46;
  --color-skeleton-highlight: #4A5568; /* Slightly lighter than base for dark theme skeleton highlight */
  --color-link: var(--color-primary);
  --color-link-hover: #8BCBD0; /* Lighter Teal */
  /* Dark theme Notification colors */
  --color-flash-default-bg: var(--color-secondary-bg);
  --color-flash-default-text: var(--color-text-primary);
  --color-flash-default-border: #606873; 
  --color-flash-error-bg: var(--color-diff-removed-bg);
  --color-flash-error-text: var(--color-diff-removed-text);
  --color-flash-error-border: color-mix(in srgb, var(--color-diff-removed-bg) 80%, var(--color-text-primary));
  --color-flash-success-bg: var(--color-diff-added-bg);
  --color-flash-success-text: var(--color-diff-added-text);
  --color-flash-success-border: color-mix(in srgb, var(--color-diff-added-bg) 80%, var(--color-text-primary));
  --color-flash-warning-bg: #5A4F38; /* Dark Desaturated Yellow/Brown */
  --color-flash-warning-text: #EEDAA5; /* Light Muted Yellow */
  --color-flash-warning-border: #6F6246;
  --color-table-border: var(--color-border); 
}

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

html { 
    scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  margin: 0;
  background-color: var(--color-background);
  color: var(--color-text-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden; 
  padding-top: 4rem; 
}

/* Social Links Header (Fixed Top Right) */
.social-header {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 1950; 
}
.social-links {
  display: flex;
  gap: 1rem; 
}
.social-links a {
  color: var(--color-text-secondary);
  transition: color 0.2s ease, transform 0.2s ease;
  font-size: 1.5rem; 
}
.social-links a:hover {
  color: var(--color-primary);
  transform: scale(1.1);
}
.social-links i { 
    display: inline-block;
    vertical-align: middle;
}

/* Enhanced Navigation Styles */
/* Clickable Hero Logo */
.logo-home-link {
  display: block;
  transition: transform 0.3s ease, opacity 0.3s ease;
  border-radius: 6px;
  overflow: hidden;
  text-decoration: none;
}

.logo-home-link:hover {
  transform: scale(1.02);
  opacity: 0.9;
  text-decoration: none;
}

.logo-home-link:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 4px;
  border-radius: 6px;
}

/* Mobile responsive adjustments for enhanced navigation */
@media (max-width: 820px) {
  .logo-home-link:hover {
    transform: scale(1.01); /* Reduced scale for mobile */
  }
}


/* Global Sidebar Toggle Button Styles */
#global-sidebar-toggle {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 2000; 
  padding: 0.6rem; 
  line-height: 1; 
  transition: transform 0.4s ease-in-out, background-color 0.2s ease, border-color 0.2s ease; 
}
body.upload-view-active .container:not(.sidebar-hidden) ~ #global-sidebar-toggle {
  transform: translateX(calc(250px + 1.5rem)); 
}
@media (max-width: 820px) {
  #global-sidebar-toggle { 
    top: 0.75rem;
    left: 0.75rem;
  }
  .social-header { 
    top: 0.75rem;
    right: 0.75rem;
  }
  body {
    padding-top: 5rem; 
  }
  body.upload-view-active .container:not(.sidebar-hidden) ~ #global-sidebar-toggle {
    transform: translateX(0); 
  }
}
.visually-hidden { /* Utility class for accessibility */
  border: 0;
  clip: rect(0 0 0 0);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  width: 1px;
  white-space: nowrap;
}


.container {
  display: grid;
  grid-template-columns: 250px 1fr; 
  gap: 1.5rem;
  padding: 1.5rem; 
  max-width: 1600px;
  margin: 0 auto; 
  position: relative;
  transition: grid-template-columns 0.4s ease-in-out;
}

.container.sidebar-hidden {
  grid-template-columns: 0px 1fr !important; 
}
.container.sidebar-hidden .sidebar {
  transform: translateX(-100%);
  opacity: 0;
  pointer-events: none; 
  position: relative; /* Changed from absolute for simplicity, behavior maintained */
  top: auto;
  border-right: 1px solid var(--color-border); 
}

body:not(.upload-view-active) .container {
  grid-template-columns: 0px 1fr; 
}
body.upload-view-active .container:not(.sidebar-hidden) {
    grid-template-columns: 250px 1fr;
}

.main-content {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  transition: transform 0.5s ease-in-out; 
  grid-column: 2 / 3; 
}


/* Typography */
h1, h2, h3 {
  color: var(--color-text-primary);
  margin-top: 0;
  font-weight: 600;
}
h1 { font-size: 2.2rem; }
h2 { font-size: 1.6rem; }
h3 { font-size: 1.2rem; }

a {
  color: var(--color-link);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
  color: var(--color-link-hover);
}
a:focus-visible { /* Accessibility: ensure links have focus state */
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 2px;
}

/* Buttons */
button, .button {
  padding: 0.7rem 1.4rem;
  font-size: 0.95rem;
  border-radius: 5px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.1s ease, opacity 0.2s ease;
  text-align: center;
  font-weight: 500;
  line-height: 1.5;
}
button:active, .button:active {
  transform: translateY(1px);
}
button:disabled {
    background-color: var(--color-secondary-bg) !important;
    color: var(--color-text-secondary) !important;
    border-color: var(--color-border) !important;
    cursor: not-allowed !important;
    opacity: 0.7;
}
button:focus-visible, .button:focus-visible { /* Accessibility: ensure buttons have focus state */
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

button.small-btn { 
  padding: 0.5rem 0.8rem;
  font-size: 0.85rem;
  display: flex; 
  align-items: center;
  gap: 0.5em;
}
button.small-btn svg, button.small-btn i.bi { 
  pointer-events: none;
  font-size: 1em; 
}

.full-width-sidebar-btn {
    width: 100%;
    margin-bottom: 0.75rem; 
    justify-content: center; 
}
.full-width-sidebar-btn:last-child {
    margin-bottom: 0;
}


button.primary, .button.primary {
  background-color: var(--color-primary);
  color: var(--color-text-on-primary);
  border-color: var(--color-primary);
}
button.primary:hover, .button.primary:hover:not(:disabled) {
  background-color: color-mix(in srgb, var(--color-primary) 85%, black);
  border-color: color-mix(in srgb, var(--color-primary) 85%, black);
}

button.secondary, .button.secondary {
  background-color: var(--color-secondary-bg);
  color: var(--color-secondary-text);
  border: 1px solid var(--color-border);
}
button.secondary:hover, .button.secondary:hover:not(:disabled) {
  background-color: color-mix(in srgb, var(--color-secondary-bg) 90%, var(--color-text-primary) 5%);
  border-color: color-mix(in srgb, var(--color-border) 90%, var(--color-text-primary) 10%);
}

/* Hero Section */
.hero {
  position: relative;
  text-align: center;
  overflow: hidden;
  border-radius: 8px;
  box-shadow: 0 4px 15px var(--color-shadow);
  min-height: 400px;
  background-image: url("/static/images/hero_bg_default.png"); 
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.5s ease-out, transform 0.5s ease-out; 
}
body[data-theme="dark"] .hero {
    /* Example: background-image: url("/static/images/hero_bg_dark.png"); */
}

#particles-js {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  z-index: 1;
}

.hero-overlay {
  position: relative;
  z-index: 2;
  width: 90%;
  max-width: 1200px;
  padding: 2rem;
  background-color: var(--color-hero-overlay-bg);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  backdrop-filter: blur(3px);
}

.hero-logo-container {
  flex: 0 0 40%; 
  max-width: 450px; 
  text-align: center;
}

.hero-logo-container img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 6px;
}

.hero-content-container {
  flex: 1 1 55%; 
  text-align: left;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
}

.hero-text {
  margin: 0 0 1.5rem 0;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  color: var(--color-hero-text);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3); 
  font-weight: 700;
}

.hero-btn {
  padding: 0.9rem 2rem;
  background-color: var(--color-hero-button-bg);
  color: var(--color-hero-button-text);
  font-size: 1.15rem;
  border-radius: 5px;
  text-decoration: none;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
  font-weight: 500;
  align-self: flex-start;
}
.hero-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 18px rgba(0,0,0,0.4);
  background-color: color-mix(in srgb, var(--color-hero-button-bg) 85%, black);
}

/* Sidebar */
.sidebar {
  background: var(--color-surface);
  padding: 1.5rem;
  border: 1px solid var(--color-border);
  border-left: none; 
  border-radius: 0 6px 6px 0; 
  box-shadow: 2px 0 15px var(--color-shadow); 
  transform: translateX(-100%); 
  opacity: 0;
  transition: transform 0.5s ease-out, opacity 0.4s ease-out;
  grid-column: 1 / 2; 
  height: fit-content; 
  position: sticky; 
  top: 1.5rem; 
  overflow-y: auto; 
  max-height: calc(100vh - 3rem); 
}
body.upload-view-active .sidebar {
  transform: translateX(0);
  opacity: 1;
}
.container.sidebar-hidden .sidebar {
  transform: translateX(-100%) !important; 
  opacity: 0 !important;
  transition-delay: 0s !important; 
}

.sidebar h2 {
  margin-bottom: 1rem; 
  color: var(--color-text-primary);
  font-size: 1.4rem;
}
#theme-toggle.full-width-sidebar-btn { 
    margin-bottom: 0.75rem;
}
.sidebar .filter-group {
  margin-bottom: 1.2rem;
}
.sidebar .filter-group h3 {
  margin-top: 0;
  margin-bottom: 0.6rem;
  font-size: 1.05rem;
  color: var(--color-text-primary);
  font-weight: 600;
}
.sidebar .filter-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  cursor: pointer;
  color: var(--color-text-secondary);
}
.sidebar .filter-group label:hover {
  color: var(--color-text-primary);
}
.sidebar .filter-group input[type="checkbox"] {
  margin-right: 0.5rem;
  vertical-align: middle;
  accent-color: var(--color-primary);
}
.sidebar .actions {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.sidebar-divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 1rem 0;
  opacity: 0.6;
}

/* Upload Area & Form */
.upload-area {
  background: var(--color-surface);
  padding: 1.5rem;
  border-radius: 6px;
  box-shadow: 0 2px 8px var(--color-shadow);
  border: 1px solid var(--color-border);
  opacity: 0;
  transform: translateY(50px); 
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
body.upload-view-active .upload-area {
  opacity: 1;
  transform: translateY(0);
}

.upload-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem; 
}

/* Upload Card Styles */
.upload-card-container {
  display: flex;
  gap: 1.5rem; 
  flex-wrap: wrap; 
}

.upload-card {
  flex: 1 1 300px; 
  min-width: 280px; 
  background-color: var(--color-background); 
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 1.25rem;
  box-shadow: 0 1px 3px var(--color-shadow);
  display: flex;
  flex-direction: column;
  gap: 1rem; 
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}
.upload-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 2px 6px color-mix(in srgb, var(--color-shadow) 70%, var(--color-primary) 30%);
}

.upload-card-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-text-primary);
}

.upload-card-icon {
  font-size: 1.8rem; 
  color: var(--color-primary);
  transition: transform 0.2s ease;
}

.upload-card-title {
  font-size: 1.1rem; 
  margin-bottom: 0; 
  font-weight: 500;
}

.upload-card-body {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  align-items: flex-start; 
}

.file-name-display {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  padding: 0.5rem 0.75rem;
  background-color: color-mix(in srgb, var(--color-surface) 80%, var(--color-background) 20%);
  border: 1px dashed var(--color-border);
  border-radius: 4px;
  width: 100%;
  text-align: left;
  min-height: 2.5em; 
  line-height: 1.5;
  word-break: break-all; 
  transition: border-color 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}
.file-name-display.file-selected {
  border-style: solid;
  border-color: var(--color-primary);
  background-color: color-mix(in srgb, var(--color-surface) 95%, var(--color-primary) 5%);
  color: var(--color-text-primary);
}
body[data-theme="dark"] .file-name-display.file-selected {
  background-color: color-mix(in srgb, var(--color-surface) 90%, var(--color-primary) 10%);
}


.upload-card .browse-button {
  padding: 0.6rem 1.2rem;
  font-size: 0.9rem;
  align-self: flex-start; 
  display: inline-flex; 
  align-items: center;
  gap: 0.5em;
}
.upload-card .browse-button i.bi {
  font-size: 1em; 
}
.upload-card .browse-button:focus-visible {
  outline-color: var(--color-primary);
}

.hidden-file-input {
  display: none;
}

.form-actions {
    display: flex;
    gap: 1rem; 
    align-items: center; 
    margin-top: 0.5rem; 
}
.form-actions #start-over.small-btn {
    padding: 0.7rem 1.4rem; 
    font-size: 0.95rem;  
}

/* Results Table */
.results-area {
 background: var(--color-surface);
  padding: 1.5rem;
  border-radius: 6px;
  box-shadow: 0 2px 8px var(--color-shadow);
  border: 1px solid var(--color-border);
}
.results table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}
.results th,
.results td {
  border: 1px solid var(--color-table-border); 
  padding: 0.8rem 1rem;
  vertical-align: top;
  text-align: left;
  font-size: 0.9rem;
}
.results th {
  background: var(--color-background);
  font-weight: 600;
  color: var(--color-text-primary);
}

.section-cell-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start; 
  gap: 0.4em; 
}
.section-cell-content .badge {
  display: inline-block; 
}

.results td:nth-child(1) { /* Section column */
  width: 25%; 
  font-weight: 500;
}
/* .results td:nth-child(2) { Old Text } */
/* .results td:nth-child(3) { New Text } */
.results td:nth-child(4) { /* Similarity column */
  width: 8%;
  text-align: center;
}
/* .results td:nth-child(5) { Summary of Change column } */


button.toggle { /* For Show/Hide details in results table */
  padding: 0.5em 1em;
  font-size: 0.85rem;
}

/* Diff Highlighting */
.diff .removed {
  background: var(--color-diff-removed-bg);
  color: var(--color-diff-removed-text);
  text-decoration: line-through;
  padding: 0.1em 0.2em;
  border-radius: 3px;
}
.diff .added {
  background: var(--color-diff-added-bg);
  color: var(--color-diff-added-text);
  padding: 0.1em 0.2em;
  border-radius: 3px;
}
.diff em { /* For "(Section content not found or empty)" */
    color: var(--color-text-secondary);
    font-style: italic;
}


/* Sub-row Styling in Results Table */
.sub-row .sub-cell {
  padding-left: 2.5rem;
  color: var(--color-text-secondary);
  background-color: color-mix(in srgb, var(--color-surface) 95%, var(--color-background) 5%);
}
.sub-row .sub-cell::before {
  content: "↳ ";
  margin-right: 0.3em;
}


/* Badge Styling */
.badge {
  display: inline-block;
  padding: 0.3em 0.6em;
  font-size: 0.75em;
  font-weight: 600;
  border-radius: 0.25em;
  color: var(--color-text-on-badge);
  vertical-align: middle;
}
.badge-administrative { background: #607d8b; }
.badge-composition    { background: #3f51b5; }
.badge-form           { background: #009688; }
.badge-clinical       { background: #e91e63; }
.badge-pharmacological{ background: #673ab7; }
.badge-pharmaceutical { background: #795548; }
.badge-other          { background: #9e9e9e; }


/* Flash Messages */
.flashes {
  grid-column: 1 / -1; /* Span across grid columns if container is a grid */
  list-style: none;
  padding: 0;
  margin: 1rem 0 0 0;
  position: relative; 
  z-index: 1000; 
}
.flashes li {
  padding: 0.85rem 1.25rem;
  margin-bottom: 1rem;
  border-radius: 5px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
  display: flex;
  align-items: center;
  font-size: 0.95rem;
}
.flashes li.default { 
  background-color: var(--color-flash-default-bg);
  color: var(--color-flash-default-text);
  border: 1px solid var(--color-flash-default-border);
}
.flashes li.error {
  background-color: var(--color-flash-error-bg);
  color: var(--color-flash-error-text);
  border: 1px solid var(--color-flash-error-border);
}
.flashes li.success {
  background-color: var(--color-flash-success-bg);
  color: var(--color-flash-success-text);
  border: 1px solid var(--color-flash-success-border);
}
.flashes li.warning {
  background-color: var(--color-flash-warning-bg);
  color: var(--color-flash-warning-text);
  border: 1px solid var(--color-flash-warning-border);
}


/* Loading Overlay & Spinner */
#loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.6); 
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 10000; 
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0s linear 0.3s;
}
#loading-overlay.loading-overlay-visible {
  opacity: 1;
  visibility: visible;
  transition: opacity 0.3s ease, visibility 0s linear 0s;
}
.loading-spinner {
  border: 6px solid var(--color-surface); 
  border-top: 6px solid var(--color-primary); 
  border-radius: 50%;
  width: 60px;
  height: 60px;
  animation: spin 1s linear infinite;
  margin-bottom: 20px;
}
@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Loading Text Scroll Animation */
.loading-text {
  color: #ffffff; 
  text-shadow: 0 0 6px rgba(0, 0, 0, 0.5); 
  font-size: 1.2rem;
  font-weight: 500;
  height: 1.4em; /* Match line-height for overflow hidden to work */
  overflow: hidden;
  text-align: center;
}
.scroll-container {
  display: flex;
  flex-direction: column;
  will-change: transform; /* Performance hint for animation */
  animation: textScroll 35s infinite linear;
  backface-visibility: hidden; /* Performance hint for animation */
}
.scroll-container div {
  height: 1.4em; 
  line-height: 1.4em;
  contain: content; /* Performance hint */
}
@keyframes textScroll { /* Adjusted for 11 messages + 1 initial state = 12 states */
  0%      { transform: translateY(0em); }    /* Initial state + Message 1 */
  8.33%   { transform: translateY(0em); }    /* Hold Message 1 */
  9.09%   { transform: translateY(-1.4em); } /* Transition to Message 2 */
  16.66%  { transform: translateY(-1.4em); } /* Hold Message 2 */
  17.42%  { transform: translateY(-2.8em); } /* Transition to Message 3 */
  24.99%  { transform: translateY(-2.8em); } /* Hold Message 3 */
  25.75%  { transform: translateY(-4.2em); } /* Transition to Message 4 */
  33.32%  { transform: translateY(-4.2em); } /* Hold Message 4 */
  34.08%  { transform: translateY(-5.6em); } /* Transition to Message 5 */
  41.65%  { transform: translateY(-5.6em); } /* Hold Message 5 */
  42.41%  { transform: translateY(-7.0em); } /* Transition to Message 6 */
  49.98%  { transform: translateY(-7.0em); } /* Hold Message 6 */
  50.74%  { transform: translateY(-8.4em); } /* Transition to Message 7 */
  58.31%  { transform: translateY(-8.4em); } /* Hold Message 7 */
  59.07%  { transform: translateY(-9.8em); } /* Transition to Message 8 */
  66.64%  { transform: translateY(-9.8em); } /* Hold Message 8 */
  67.40%  { transform: translateY(-11.2em);} /* Transition to Message 9 */
  74.97%  { transform: translateY(-11.2em);} /* Hold Message 9 */
  75.73%  { transform: translateY(-12.6em);} /* Transition to Message 10 */
  83.30%  { transform: translateY(-12.6em);} /* Hold Message 10 */
  84.06%  { transform: translateY(-14.0em);} /* Transition to Message 11 (Last one) */
  100%    { transform: translateY(-14.0em);} /* Hold Message 11 until loop */
}


/* Skeleton Loading Styles */
@keyframes skeleton-loading-animation {
  0% { background-color: var(--color-skeleton-base); }
  50% { background-color: var(--color-skeleton-highlight); }
  100% { background-color: var(--color-skeleton-base); }
}
@keyframes skeleton-loading-animation-reverse { /* For internal elements */
  0% { background-color: var(--color-skeleton-highlight); }
  50% { background-color: var(--color-skeleton-base); }
  100% { background-color: var(--color-skeleton-highlight); }
}


.skeleton {
  background-color: var(--color-skeleton-base) !important;
}
.skeleton .sidebar,
.skeleton .upload-area {
    opacity: 0 !important; 
}
.skeleton #global-sidebar-toggle,
.skeleton .social-header { 
  visibility: hidden; 
}
.skeleton .hero {
  background-image: none !important;
  background-color: var(--color-skeleton-base);
  animation: skeleton-loading-animation 1.5s ease-in-out infinite;
  min-height: 400px;
}
.skeleton #particles-js {
    display: none;
}
.skeleton .hero-overlay {
    background-color: transparent !important;
    backdrop-filter: none !important;
}
.skeleton .hero-logo-container,
.skeleton .hero-text,
.skeleton .hero-btn,
.skeleton .badge {
  visibility: hidden;
}
.skeleton .sidebar h2,
.skeleton .sidebar .filter-group h3,
.skeleton .sidebar .filter-group label,
.skeleton .upload-area h2, /* General h2 in upload-area if any */
.skeleton .results-area h2 {
  background-color: var(--color-skeleton-base);
  color: transparent !important;
  border-color: transparent !important;
  animation: skeleton-loading-animation 1.5s ease-in-out infinite;
  border-radius: 4px;
  height: 24px;
  margin-bottom: 0.8rem;
  width: 60%;
}
.skeleton .sidebar .filter-group label {
  height: 20px;
  width: 80%;
}

/* Enhanced Skeleton for Upload Cards */
.skeleton .upload-card {
  background-color: var(--color-skeleton-base) !important;
  border-color: var(--color-skeleton-base) !important;
  animation: skeleton-loading-animation 1.5s ease-in-out infinite;
  box-shadow: none !important;
  height: 150px; /* Ensure card has a fixed height during skeleton */
  width: 100%;   /* Ensure card takes width during skeleton */
}
.skeleton .upload-card .upload-card-header, /* Make sure internal structure is visible for its children */
.skeleton .upload-card .upload-card-body {
   visibility: visible !important; 
}
.skeleton .upload-card .upload-card-icon {
  visibility: visible !important; 
  color: transparent !important; 
  background-color: var(--color-skeleton-highlight) !important; 
  animation: skeleton-loading-animation-reverse 1.5s ease-in-out infinite;
  width: 1.8rem; 
  height: 1.8rem; 
  border-radius: 50%; 
}
.skeleton .upload-card .upload-card-title {
  visibility: visible !important;
  color: transparent !important;
  background-color: var(--color-skeleton-highlight) !important;
  animation: skeleton-loading-animation-reverse 1.5s ease-in-out infinite;
  height: 1.1rem; 
  width: 150px; 
  border-radius: 4px;
  margin-bottom: 0 !important;
}
.skeleton .upload-card .file-name-display {
  visibility: visible !important;
  color: transparent !important;
  background-color: var(--color-skeleton-highlight) !important;
  animation: skeleton-loading-animation-reverse 1.5s ease-in-out infinite;
  border-color: transparent !important;
  min-height: 2.5em;
  width: 100%;
  border-radius: 4px;
}
.skeleton .upload-card .browse-button {
  visibility: visible !important;
  color: transparent !important;
  background-color: var(--color-skeleton-highlight) !important;
  animation: skeleton-loading-animation-reverse 1.5s ease-in-out infinite;
  border-color: transparent !important;
  width: 120px; 
  height: 38px; 
  border-radius: 4px;
}
.skeleton .upload-card .browse-button i.bi { /* Hide icon inside skeleton button */
  display: none !important; 
}


.skeleton .form-actions button[type="submit"], /* Skeleton for main compare button */
.skeleton .form-actions #start-over {
  background-color: var(--color-skeleton-base) !important;
  color: transparent !important;
  border-color: transparent !important;
  animation: skeleton-loading-animation 1.5s ease-in-out infinite;
  border-radius: 4px;
}
.skeleton .form-actions button[type="submit"] { height: 40px; width: 180px; }
.skeleton .form-actions #start-over { height: 40px; width: 120px; }


.skeleton .sidebar .actions button,
.skeleton #theme-toggle { 
  background-color: var(--color-skeleton-base) !important;
  color: transparent !important;
  border-color: transparent !important;
  animation: skeleton-loading-animation 1.5s ease-in-out infinite;
  border-radius: 4px;
  height: 40px; /* Standard height for these buttons in skeleton */
}
.skeleton .sidebar .actions button, 
.skeleton .sidebar #theme-toggle.full-width-sidebar-btn { 
  width: 100%;
}
.skeleton .results table {
  border-color: transparent;
}
.skeleton .results th,
.skeleton .results td {
  background-color: var(--color-skeleton-base);
  color: transparent !important;
  border-color: var(--color-skeleton-base) !important;
  animation: skeleton-loading-animation 1.5s ease-in-out infinite;
}
.skeleton .results th { height: 40px; }
.skeleton .results td { height: 50px; }
.skeleton .results button.toggle { visibility: hidden; }
.skeleton .upload-form input[type="file"] { display: none !important; } /* Should already be hidden by .hidden-file-input */


/* Responsiveness */
@media (max-width: 820px) {
  body:not(.upload-view-active) .container {
    grid-template-columns: 1fr; 
  }
  body.upload-view-active .container:not(.sidebar-hidden) {
     grid-template-columns: 1fr; 
  }
  body.upload-view-active .sidebar { 
    position: relative; 
    top: auto;
    transform: translateX(0); 
    opacity: 1;
    width: 100%;
    border-radius: 6px; 
    margin-bottom: 1.5rem; 
    transition: opacity 0.3s, transform 0.3s;
    border-left: 1px solid var(--color-border); 
  }
  .container.sidebar-hidden {
    grid-template-columns: 1fr !important;
  }
  .container.sidebar-hidden .sidebar {
    display: none; 
  }

  .hero {
    min-height: auto;
    padding-top: 2rem;
    padding-bottom: 2rem;
  }
  .hero-overlay {
    flex-direction: column;
    width: 95%;
    padding: 1.5rem;
    gap: 1.5rem;
  }
  .hero-logo-container {
    flex-basis: auto;
    width: 70%;
    max-width: 300px; 
    margin-bottom: 1rem;
  }
  .hero-content-container {
    flex-basis: auto;
    text-align: center;
    align-items: center;
  }
  .hero-text {
    font-size: clamp(1.5rem, 5vw, 2.2rem);
  }
  .hero-btn {
    align-self: center;
  }
  .form-actions {
    flex-direction: column; 
    align-items: stretch; 
  }
  .form-actions button {
    width: 100%; 
  }
  .upload-card-container {
    flex-direction: column; /* Stack cards on smaller screens */
  }
}

@media (max-width: 480px) {
    #global-sidebar-toggle {
        top: 0.5rem;
        left: 0.5rem;
        padding: 0.5rem;
    }
    .social-header {
        top: 0.5rem;
        right: 0.5rem;
    }
    .social-links a {
        font-size: 1.3rem; 
    }
    body.upload-view-active .container:not(.sidebar-hidden) ~ #global-sidebar-toggle {
      transform: translateX(0); 
    }
    .hero-logo-container {
        width: 80%;
    }
    .hero-text {
        font-size: clamp(1.4rem, 6vw, 2rem);
    }
    .hero-btn {
        padding: 0.8rem 1.5rem;
        font-size: 1rem;
    }
}

/* Print-friendly Styles */
@media print {
  :root { /* Define print-specific colors, overriding theme variables */
    --color-background: #ffffff !important;
    --color-surface: #ffffff !important;
    --color-text-primary: #000000 !important;
    --color-text-secondary: #333333 !important;
    --color-border: #cccccc !important;
    --color-table-border: #cccccc !important; 
    --color-diff-added-bg: transparent !important; /* No background for diffs in print */
    --color-diff-added-text: #000000 !important;
    --color-diff-removed-bg: transparent !important; /* No background for diffs in print */
    --color-diff-removed-text: #000000 !important; /* Show removed text, but styled */
  }
  html {
    scroll-behavior: auto !important; 
  }
  body {
    background: var(--color-background) !important;
    font-family: 'Times New Roman', Times, serif !important;
    font-size: 10pt !important;
    color: var(--color-text-primary) !important;
    overflow-x: visible !important;
    padding-top: 0 !important; 
    transition: none !important; /* No transitions in print */
  }
  .container { display: block !important; padding: 0 !important; margin: 0 !important; }
  /* Hide non-essential elements for print */
  .sidebar, .sidebar-controls, .actions, 
  .upload-form button[type="submit"], .form-actions #start-over, 
  .hero, button.toggle, .flashes, #theme-toggle, #global-sidebar-toggle, 
  #particles-js, #loading-overlay, .social-header {
    display: none !important;
  }
  .main-content { gap: 0 !important; }
  
  /* Upload Area for Print */
  .upload-area {
    box-shadow: none !important;
    border: 1px solid var(--color-border) !important;
    padding: 0.5rem !important;
    margin-bottom: 1rem; /* Add some space before results */
  }
  .upload-card {
    padding: 0.5rem !important;
    border: 1px solid var(--color-border) !important;
    box-shadow: none !important;
    background-color: transparent !important;
  }
  .upload-card-icon, .upload-card .browse-button { display: none !important; }
  .file-name-display { 
    background: transparent !important; 
    border-style: none !important; 
    padding: 0.2em 0 !important;
    color: var(--color-text-primary) !important; /* Ensure filename is black */
  }
  .upload-card-title {
    font-size: 1em !important; /* Match body font size */
    font-weight: bold !important;
  }


  /* Results Table for Print */
  .results-area, .results table, .results th, .results td {
    display: block !important; /* Simple block layout for print */
    width: 100% !important;
    box-shadow: none !important;
    border: 1px solid var(--color-table-border) !important; 
    padding: 0.5rem !important;
    font-size: 9pt !important;
  }
  .results th { background-color: #eeeeee !important; }
  .results tr, .results td { page-break-inside: avoid !important; }
  .badge {
    border: 1px solid #000 !important;
    color: #000 !important;
    background: transparent !important;
    padding: 0.1em 0.3em !important;
    font-size: 0.7em !important;
    font-weight: normal !important;
  }
  .diff .removed, .diff .added {
    padding: 0 !important;
    border-radius: 0 !important;
    background: transparent !important;
    color: var(--color-text-primary) !important;
  }
  .diff .removed { text-decoration: line-through !important; }
  .diff .added { font-weight: bold !important; text-decoration: none !important; }
  .diff em { color: var(--color-text-secondary) !important; }
}

/* ========================================
   HEAT MAP VISUALIZATION STYLES
   ======================================== */

.heatmap-area {
  background: var(--color-surface);
  padding: 1.5rem;
  border-radius: 6px;
  box-shadow: 0 2px 8px var(--color-shadow);
  border: 1px solid var(--color-border);
  margin-bottom: 2rem;
  transition: all 0.3s ease;
}

/* Header Section */
.heatmap-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.heatmap-title-group h2 {
  margin-bottom: 0.5rem;
  color: var(--color-text-primary);
}

.heatmap-metrics {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.metric-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.metric-item i {
  color: var(--color-primary);
}

.heatmap-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Legend Section */
.heatmap-legend {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background-color: var(--color-background);
  border-radius: 4px;
  border: 1px solid var(--color-border);
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.legend-title {
  font-weight: 600;
  color: var(--color-text-primary);
  margin-right: 0.5rem;
}

.legend-items {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.legend-color {
  width: 18px;
  height: 18px;
  border-radius: 3px;
  border: 1px solid var(--color-border);
  transition: transform 0.2s ease;
}

.legend-color:hover {
  transform: scale(1.1);
}

/* Color definitions */
.legend-color.minimal,
.heatmap-cell.minimal {
  background: linear-gradient(135deg, #e8f5e8 0%, #d4edda 100%);
  color: #155724;
}

.legend-color.minor,
.heatmap-cell.minor {
  background: linear-gradient(135deg, #fff3cd 0%, #ffeaa7 100%);
  color: #856404;
}

.legend-color.moderate,
.heatmap-cell.moderate {
  background: linear-gradient(135deg, #ffeaa7 0%, #fdcb6e 100%);
  color: #8b4513;
}

.legend-color.major,
.heatmap-cell.major {
  background: linear-gradient(135deg, #fab1a0 0%, #e17055 100%);
  color: #721c24;
}

.legend-color.critical,
.heatmap-cell.critical {
  background: linear-gradient(135deg, #e17055 0%, #d63031 100%);
  color: #ffffff;
}

/* Dark theme color overrides */
body[data-theme="dark"] .legend-color.minimal,
body[data-theme="dark"] .heatmap-cell.minimal {
  background: linear-gradient(135deg, #2d5a2d 0%, #1e3a1e 100%);
  color: #a8d8a8;
}

body[data-theme="dark"] .legend-color.minor,
body[data-theme="dark"] .heatmap-cell.minor {
  background: linear-gradient(135deg, #5a4f2d 0%, #4a3f1d 100%);
  color: #f0e68c;
}

body[data-theme="dark"] .legend-color.moderate,
body[data-theme="dark"] .heatmap-cell.moderate {
  background: linear-gradient(135deg, #5a4f2d 0%, #6a4f1d 100%);
  color: #ffd700;
}

body[data-theme="dark"] .legend-color.major,
body[data-theme="dark"] .heatmap-cell.major {
  background: linear-gradient(135deg, #5a2d2d 0%, #6a1d1d 100%);
  color: #ffb3b3;
}

body[data-theme="dark"] .legend-color.critical,
body[data-theme="dark"] .heatmap-cell.critical {
  background: linear-gradient(135deg, #4a1f1f 0%, #5a0f0f 100%);
  color: #ffffff;
}

/* Main Container */
.heatmap-container {
  position: relative;
  min-height: 300px;
  transition: all 0.3s ease;
}

.heatmap-container.hidden {
  display: none;
}

/* Grid Layout */
.heatmap-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 0.75rem;
  padding: 1rem;
  background: var(--color-background);
  border-radius: 4px;
  border: 1px solid var(--color-border);
  transition: all 0.3s ease;
}

/* Heat Map Cells */
.heatmap-cell {
  position: relative;
  padding: 1.25rem;
  border-radius: 6px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.3s ease;
  min-height: 100px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.heatmap-cell:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px var(--color-shadow);
  border-color: var(--color-primary);
  z-index: 10;
}

.heatmap-cell:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.heatmap-cell:active {
  transform: translateY(-1px);
}

/* Cell Content */
.heatmap-cell-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.75rem;
  gap: 0.5rem;
}

.heatmap-cell-title {
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.3;
  margin: 0;
  color: inherit;
  flex: 1;
}

.heatmap-cell-badge {
  font-size: 0.7rem;
  padding: 0.25em 0.5em;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.2);
  color: inherit;
  font-weight: 500;
  white-space: nowrap;
  backdrop-filter: blur(5px);
}

.heatmap-cell-metrics {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  margin-top: auto;
}

.heatmap-cell-similarity {
  font-weight: 700;
  font-size: 0.9rem;
}

.heatmap-cell-subsections {
  opacity: 0.85;
  font-size: 0.75rem;
}

.heatmap-cell-icon {
  margin-left: 0.5rem;
  opacity: 0.6;
  transition: opacity 0.2s ease;
}

.heatmap-cell:hover .heatmap-cell-icon {
  opacity: 1;
}

/* Tooltip */
.heatmap-tooltip {
  position: absolute;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 1rem;
  box-shadow: 0 8px 32px var(--color-shadow);
  font-size: 0.85rem;
  max-width: 320px;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  backdrop-filter: blur(10px);
}

.heatmap-tooltip.visible {
  opacity: 1;
}

.tooltip-section {
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.5rem;
}

.tooltip-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.3rem;
  color: var(--color-text-secondary);
}

.tooltip-row strong {
  color: var(--color-text-primary);
}

.tooltip-action {
  margin-top: 0.5rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--color-border);
  color: var(--color-primary);
  font-size: 0.8rem;
  text-align: center;
}

/* Responsive Design */
@media (max-width: 820px) {
  .heatmap-header {
    flex-direction: column;
    align-items: stretch;
  }
  
  .heatmap-controls {
    justify-content: space-between;
  }
  
  .heatmap-legend {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
  
  .legend-items {
    justify-content: center;
    gap: 0.75rem;
  }
  
  .heatmap-grid {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.5rem;
    padding: 0.75rem;
  }
  
  .heatmap-cell {
    min-height: 80px;
    padding: 1rem;
  }
  
  .heatmap-cell-title {
    font-size: 0.85rem;
  }
  
  .heatmap-tooltip {
    max-width: 280px;
    padding: 0.75rem;
  }
}

@media (max-width: 480px) {
  .heatmap-metrics {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .legend-items {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
  
  .heatmap-grid {
    grid-template-columns: 1fr;
  }
  
  .heatmap-cell {
    min-height: 70px;
    padding: 0.75rem;
  }
}

/* Animation and Transitions */
@keyframes heatmapFadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.heatmap-cell {
  animation: heatmapFadeIn 0.3s ease-out forwards;
}

.heatmap-cell:nth-child(odd) {
  animation-delay: 0.1s;
}

.heatmap-cell:nth-child(even) {
  animation-delay: 0.2s;
}

/* Print Styles */
@media print {
  .heatmap-area {
    page-break-inside: avoid;
    box-shadow: none;
    border: 1px solid #000;
  }
  
  .heatmap-controls,
  .heatmap-tooltip {
    display: none !important;
  }
  
  .heatmap-grid {
    grid-template-columns: repeat(4, 1fr) !important;
    gap: 0.25rem !important;
    background: white !important;
  }
  
  .heatmap-cell {
    border: 1px solid #000 !important;
    background: white !important;
    color: black !important;
    box-shadow: none !important;
  }
  
  .heatmap-cell::after {
    content: " (" attr(data-similarity) "%)";
    font-weight: bold;
  }
}