/* ==========================================================================
   BitDiff CSS Design System
   Aesthetics: Rich dark mode, glassmorphism, responsive grid layouts, 
   glowing accents, and high-performance custom hex diff grids.
   ========================================================================== */

:root {
  --bg-main: #0b0c10;
  --bg-card: rgba(22, 25, 38, 0.7);
  --bg-card-hover: rgba(28, 32, 48, 0.85);
  --bg-modal: rgba(14, 16, 26, 0.95);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.15);
  
  /* Accent Color Tokens */
  --primary: #5f5ce6;
  --primary-glow: rgba(95, 92, 230, 0.4);
  --primary-hover: #7370f0;
  
  --success: #10b981;
  --success-glow: rgba(16, 185, 129, 0.25);
  --danger: #f43f5e;
  --danger-glow: rgba(244, 63, 94, 0.25);
  --warn-a: #06b6d4;
  --warn-a-glow: rgba(6, 182, 212, 0.25);
  --warn-b: #d946ef;
  --warn-b-glow: rgba(217, 70, 239, 0.25);

  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-dark: #4b5563;

  /* Font Families */
  --font-ui: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', source-code-pro, Menlo, Monaco, Consolas, monospace;
}

/* Base resets */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: var(--font-ui);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Background Glowing Spheres */
.glow-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}

.glow-sphere {
  position: absolute;
  border-radius: 50%;
  filter: blur(140px);
  opacity: 0.15;
}

.glow-1 {
  top: -10%;
  left: 15%;
  width: 50vw;
  height: 50vw;
  background: radial-gradient(circle, var(--primary) 0%, transparent 70%);
}

.glow-2 {
  bottom: -10%;
  right: 10%;
  width: 60vw;
  height: 60vw;
  background: radial-gradient(circle, var(--warn-b) 0%, transparent 70%);
}

/* Layout Container */
.app-container {
  max-width: 1300px;
  margin: 0 auto;
  padding: 40px 24px 80px 24px;
}

/* Header */
.app-header {
  text-align: center;
  margin-bottom: 48px;
}

.header-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
  color: var(--primary);
  filter: drop-shadow(0 0 12px var(--primary-glow));
}

.header-logo h1 {
  font-size: 2.8rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #ffffff 40%, #a5a2ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.header-subtitle {
  color: var(--text-muted);
  font-size: 1.1rem;
  font-weight: 300;
  max-width: 600px;
  margin: 0 auto;
}

/* Selection Cards Grid */
.selection-section {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-bottom: 32px;
}

@media(min-width: 900px) {
  .selection-section {
    grid-template-columns: 1fr 1fr;
  }
}

.source-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 28px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1), border-color 0.3s ease, box-shadow 0.3s ease;
  overflow: hidden;
}

.source-card:hover {
  border-color: var(--border-hover);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.card-header-glow {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
}

.color-a { background: linear-gradient(90deg, var(--warn-a), var(--primary)); }
.color-b { background: linear-gradient(90deg, var(--primary), var(--warn-b)); }

.source-title-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}

.source-badge {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 4px 10px;
  border-radius: 6px;
}

.badge-a {
  background-color: var(--warn-a-glow);
  color: #22d3ee;
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.badge-b {
  background-color: var(--warn-b-glow);
  color: #f472b6;
  border: 1px solid rgba(217, 70, 239, 0.3);
}

.source-label {
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Drag & Drop Zone */
.drop-zone {
  border: 2px dashed rgba(255, 255, 255, 0.15);
  border-radius: 12px;
  padding: 30px 20px;
  text-align: center;
  background: rgba(0, 0, 0, 0.2);
  transition: border-color 0.3s ease, background-color 0.3s ease;
  position: relative;
  cursor: pointer;
}

.drop-zone.drag-over {
  border-color: var(--primary);
  background: rgba(95, 92, 230, 0.08);
}

.drop-zone-content {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.upload-icon {
  margin-bottom: 14px;
  color: var(--text-muted);
  transition: transform 0.3s ease, color 0.3s ease;
}

.drop-zone:hover .upload-icon,
.drop-zone.drag-over .upload-icon {
  transform: translateY(-4px);
  color: var(--primary);
}

.drop-text {
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 4px;
}

.drop-subtext {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.file-count-indicator {
  margin-top: 14px;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: right;
}

/* Button Group inside cards */
.btn-group {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  z-index: 2;
}

/* General Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 0.88rem;
  padding: 10px 18px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  gap: 8px;
}

.btn-primary {
  background: var(--primary);
  color: white;
}

.btn-primary:hover {
  background: var(--primary-hover);
  box-shadow: 0 0 14px var(--primary-glow);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
}

.btn-mini {
  padding: 6px 12px;
  font-size: 0.78rem;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.btn-mini:hover {
  background: rgba(255, 255, 255, 0.18);
}

.btn-compare {
  background: linear-gradient(135deg, var(--primary) 0%, #7c4dff 100%);
  color: white;
  font-size: 1.1rem;
  padding: 16px 36px;
  border-radius: 12px;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 4px 20px rgba(95, 92, 230, 0.3);
}

.btn-compare:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(95, 92, 230, 0.5);
}

.btn-compare:disabled {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-dark);
  cursor: not-allowed;
  box-shadow: none;
  border: 1px solid rgba(255, 255, 255, 0.02);
}

/* Compare Action Container */
.compare-action-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 40px;
  gap: 20px;
}

/* Progress indicator */
.progress-container {
  width: 100%;
  max-width: 600px;
  background: rgba(0,0,0,0.2);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
}

.progress-stats {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 8px;
}

.progress-bar-bg {
  width: 100%;
  height: 8px;
  background: rgba(255,255,255,0.05);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 8px;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--warn-b));
  border-radius: 4px;
  width: 0%;
  transition: width 0.1s ease;
  box-shadow: 0 0 10px var(--primary-glow);
}

.progress-file-name {
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Dashboard Stat Cards */
.dashboard-section {
  margin-bottom: 40px;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

@media(min-width: 768px) {
  .dashboard-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 18px 12px;
  text-align: center;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Stat Border Accents */
.border-success { border-top: 3px solid var(--success); }
.border-danger { border-top: 3px solid var(--danger); }
.border-warn-a { border-top: 3px solid var(--warn-a); }
.border-warn-b { border-top: 3px solid var(--warn-b); }

/* Text Color Accents */
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warn-a { color: #06b6d4; }
.text-warn-b { color: #ec4899; }

/* Results Panel styling */
.results-section {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 24px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.results-toolbar {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 24px;
}

@media(min-width: 1000px) {
  .results-toolbar {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

/* Filter Tab buttons */
.filter-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tab-btn {
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 8px;
}

.tab-btn:hover {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-main);
}

.tab-btn.active {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
}

.tab-btn.active.text-danger { border-color: rgba(244, 63, 94, 0.3); background: rgba(244, 63, 94, 0.08); }
.tab-btn.active.text-success { border-color: rgba(16, 185, 129, 0.3); background: rgba(16, 185, 129, 0.08); }
.tab-btn.active.text-warn-a { border-color: rgba(6, 182, 212, 0.3); background: rgba(6, 182, 212, 0.08); }
.tab-btn.active.text-warn-b { border-color: rgba(217, 70, 239, 0.3); background: rgba(217, 70, 239, 0.08); }

.tab-count {
  font-size: 0.72rem;
  background: rgba(0, 0, 0, 0.3);
  padding: 2px 6px;
  border-radius: 4px;
}

/* Search Box and Sorting */
.search-sort-box {
  display: flex;
  gap: 12px;
  width: 100%;
}

@media(min-width: 1000px) {
  .search-sort-box {
    width: auto;
  }
}

.search-input-wrapper {
  position: relative;
  flex-grow: 1;
}

@media(min-width: 1000px) {
  .search-input-wrapper {
    width: 250px;
  }
}

.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

#search-input {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px 12px 10px 38px;
  color: var(--text-main);
  font-family: var(--font-ui);
  width: 100%;
  outline: none;
  font-size: 0.88rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

#search-input:focus {
  border-color: rgba(95, 92, 230, 0.5);
  box-shadow: 0 0 8px rgba(95, 92, 230, 0.2);
}

.sort-dropdown {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px 16px;
  color: var(--text-main);
  font-family: var(--font-ui);
  outline: none;
  font-size: 0.88rem;
  cursor: pointer;
}

.sort-dropdown:focus {
  border-color: rgba(95, 92, 230, 0.5);
}

/* Results Table */
.table-wrapper {
  overflow-x: auto;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: rgba(0,0,0,0.15);
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.results-table th,
.results-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-color);
}

.results-table th {
  font-weight: 600;
  color: var(--text-muted);
  background: rgba(0, 0, 0, 0.2);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.5px;
}

.results-table tbody tr {
  transition: background-color 0.15s ease;
}

.results-table tbody tr:hover {
  background-color: var(--bg-card-hover);
}

.num-col {
  text-align: right;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.center-col {
  text-align: center;
}

.cell-path {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  word-break: break-all;
  color: #e5e7eb;
}

.empty-results-msg {
  padding: 40px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Badges inside table */
.status-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  text-align: center;
  min-width: 80px;
}

.badge-identical { background: rgba(16, 185, 129, 0.15); color: #34d399; border: 1px solid rgba(16, 185, 129, 0.2); }
.badge-different { background: rgba(244, 63, 94, 0.15); color: #f87171; border: 1px solid rgba(244, 63, 94, 0.2); }
.badge-only-a { background: rgba(6, 182, 212, 0.15); color: #22d3ee; border: 1px solid rgba(6, 182, 212, 0.2); }
.badge-only-b { background: rgba(217, 70, 239, 0.15); color: #f472b6; border: 1px solid rgba(217, 70, 239, 0.2); }

/* Custom Scrollbars */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.2);
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.12);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.22);
}

/* Modal Overlay */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(4, 5, 8, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: fadeIn 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Modal Card */
.modal-card {
  background: var(--bg-modal);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  width: 100%;
  max-width: 1400px;
  height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.8), 0 0 40px rgba(95, 92, 230, 0.15);
  animation: slideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideUp {
  from { transform: translateY(20px) scale(0.97); }
  to { transform: translateY(0) scale(1); }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  background: rgba(0, 0, 0, 0.2);
}

.modal-title-desc {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 85%;
}

.modal-badge {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  background: var(--primary-glow);
  color: #a5a2ff;
  border: 1px solid rgba(95, 92, 230, 0.3);
  padding: 2px 8px;
  border-radius: 4px;
  white-space: nowrap;
}

.modal-title {
  font-size: 1.15rem;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.modal-close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
}

.modal-close-btn:hover {
  background: rgba(255,255,255,0.06);
  color: white;
}

/* Modal Controls (toolbar below header) */
.modal-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  background: rgba(0,0,0,0.1);
  border-bottom: 1px solid var(--border-color);
  gap: 16px;
}

.modal-control-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.control-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

.diff-counter-label {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  color: var(--text-main);
  background: rgba(0,0,0,0.3);
  padding: 4px 10px;
  border-radius: 6px;
  min-width: 110px;
  text-align: center;
}

.modal-control-info {
  font-size: 0.85rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.color-diff {
  background-color: var(--danger);
  box-shadow: 0 0 6px rgba(244, 63, 94, 0.6);
}

/* Hex Viewer Grid */
.hex-viewer-workspace {
  flex-grow: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto 1fr;
  height: calc(100% - 130px);
}

.hex-side-header {
  padding: 10px 24px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  background: rgba(0, 0, 0, 0.25);
  border-bottom: 1.5px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.hex-side-header.side-a {
  border-right: 1px solid rgba(255,255,255,0.06);
}

.hex-meta-info {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.hex-viewer-split-container {
  grid-column: span 2;
  display: flex;
  height: 100%;
  overflow: hidden;
  background-color: #08090d;
}

.hex-pane-scroll {
  flex: 1;
  height: 100%;
  overflow: auto;
  padding: 16px 24px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.5;
  color: #9ca3af;
}

#pane-a-scroll {
  border-right: 1px solid rgba(255,255,255,0.06);
}

/* The dynamic hex grid layout */
.hex-grid-content {
  display: flex;
  flex-direction: column;
  min-width: 620px;
}

/* One Hex Line row */
.hex-line {
  display: flex;
  align-items: center;
  height: 24px;
  border-radius: 4px;
}

.hex-line:hover {
  background-color: rgba(255, 255, 255, 0.03);
}

/* Highlights the entire line when a mismatch exists */
.hex-line.has-diff {
  background-color: rgba(244, 63, 94, 0.03);
}

.hex-line.active-diff-line {
  background-color: rgba(244, 63, 94, 0.08) !important;
}

/* Columns inside the line */
.hex-addr {
  color: var(--text-dark);
  font-weight: 500;
  width: 90px;
  user-select: none;
}

.hex-bytes {
  display: flex;
  gap: 8px;
  width: 370px;
  margin-right: 30px;
  color: #d1d5db;
}

.hex-byte {
  width: 18px;
  text-align: center;
  display: inline-block;
}

.hex-ascii {
  color: #6b7280;
  display: flex;
  gap: 1px;
}

.hex-char {
  width: 8px;
  text-align: center;
  display: inline-block;
}

/* Highlight mismatch byte/char */
.diff-byte {
  color: #ff6b8b;
  background-color: rgba(244, 63, 94, 0.2);
  border-radius: 3px;
  font-weight: 700;
  box-shadow: 0 0 4px rgba(244, 63, 94, 0.3);
}

.diff-char {
  color: #ff6b8b;
  background-color: rgba(244, 63, 94, 0.2);
  border-radius: 1px;
  font-weight: 700;
}