:root {
  /* Core Theme Colors */
  --bg-dark: #090d16;
  --bg-gradient: radial-gradient(circle at 50% 50%, #172136 0%, #080d16 100%);
  --panel-bg: rgba(18, 26, 44, 0.55);
  --panel-border: rgba(255, 255, 255, 0.08);
  --panel-border-glow: rgba(59, 130, 246, 0.15);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --accent-blue: #3b82f6;
  --accent-purple: #8b5cf6;
  --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  
  /* Initial Group Colors */
  --group-1-color: #ff5e62;
  --group-2-color: #00f2fe;
  --group-3-color: #a18cd1;
  --group-4-color: #ffd200;
  --group-5-color: #11998e;
  
  /* UI Constants */
  --header-height: 70px;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  --inner-shadow: inset 0 2px 4px 0 rgba(0, 0, 0, 0.2);
}

/* Global Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg-dark);
  background-image: var(--bg-gradient);
  color: var(--text-primary);
  min-height: 100vh;
  overflow: hidden;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.02);
  border-radius: 4px;
}

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

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.25);
}

/* Application Layout */
.app-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  width: 100vw;
}

/* Header Styling */
.app-header {
  height: var(--header-height);
  background: rgba(13, 20, 35, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--panel-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 28px;
  z-index: 10;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  color: var(--accent-blue);
  filter: drop-shadow(0 0 8px rgba(59, 130, 246, 0.5));
}

.logo-area h1 {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1.45rem;
  letter-spacing: -0.02em;
}

.logo-area h1 span {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.social-follow {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-left: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.social-btn {
  background: rgba(59, 130, 246, 0.1);
  color: var(--accent-blue);
  padding: 4px 10px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 600;
  transition: all var(--transition-fast);
  border: 1px solid rgba(59, 130, 246, 0.2);
}

.social-btn:hover {
  background: rgba(59, 130, 246, 0.2);
  color: #ffffff;
  border-color: rgba(59, 130, 246, 0.4);
}

/* Standalone Header File Sync Controls */
.file-sync-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text-secondary);
  padding: 8px 14px;
  border-radius: 10px;
  font-family: 'Inter', sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  user-select: none;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.09);
  color: var(--text-primary);
  border-color: var(--accent-blue);
  box-shadow: 0 0 10px rgba(59, 130, 246, 0.1);
}

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

.file-input-label {
  display: inline-flex;
}

/* Content Grid Layout */
.app-content {
  display: grid;
  grid-template-columns: 380px 1fr;
  height: calc(100vh - var(--header-height));
  width: 100vw;
  overflow: hidden;
}

/* Sidebar Styling */
.sidebar {
  background: rgba(10, 15, 26, 0.45);
  border-right: 1px solid var(--panel-border);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  overflow-y: auto;
}

/* Panel Card Styles (Glassmorphism) */
.panel-card {
  background: var(--panel-bg);
  backdrop-filter: blur(16px);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  padding: 20px;
  box-shadow: var(--box-shadow);
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.panel-card:hover {
  border-color: var(--panel-border-glow);
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.45), 0 0 15px rgba(59, 130, 246, 0.05);
}

.panel-card h2 {
  font-family: 'Outfit', sans-serif;
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.panel-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.panel-subtitle {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.count-badge {
  background: rgba(255, 255, 255, 0.06);
  padding: 3px 9px;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-blue);
  border: 1px solid rgba(59, 130, 246, 0.2);
}

/* Group Customization Editor */
.groups-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 18px;
}

.group-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.04);
  padding: 10px 14px;
  border-radius: 12px;
  transition: background var(--transition-fast);
}

.group-row:hover {
  background: rgba(255, 255, 255, 0.04);
}

.group-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.group-badge {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  color: #000;
  text-shadow: 0 1px 1px rgba(255, 255, 255, 0.2);
}

.group-name {
  font-size: 0.88rem;
  font-weight: 500;
}

.group-name-input {
  font-size: 0.88rem;
  font-weight: 500;
  background: transparent;
  border: 1px solid transparent;
  color: inherit;
  width: 120px;
  padding: 2px 4px;
  border-radius: 4px;
  font-family: inherit;
  transition: all var(--transition-fast);
}

.group-name-input:focus {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  outline: none;
}

.color-picker-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 0, 0, 0.25);
  padding: 4px 8px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.color-picker-wrapper input[type="color"] {
  -webkit-appearance: none;
  border: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  cursor: pointer;
  background: none;
}

.color-picker-wrapper input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 0;
}

.color-picker-wrapper input[type="color"]::-webkit-color-swatch {
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 50%;
}

.color-hex {
  font-family: monospace;
  font-size: 0.78rem;
  text-transform: uppercase;
  color: var(--text-secondary);
  user-select: all;
}

/* Color Presets Section */
.presets-section {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 14px;
}

.presets-section label {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.preset-buttons {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.preset-btn {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  color: var(--text-secondary);
  padding: 6px 10px;
  border-radius: 8px;
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.preset-btn:hover {
  background: rgba(255, 255, 255, 0.09);
  color: var(--text-primary);
  border-color: var(--accent-blue);
}

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

/* Map Settings & Switch */
.map-settings {
  margin-bottom: 0;
}

.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 0;
}

.setting-label {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 22px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  transition: var(--transition-normal);
  border-radius: 22px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 14px;
  width: 14px;
  left: 3px;
  bottom: 3px;
  background-color: var(--text-secondary);
  transition: var(--transition-normal);
  border-radius: 50%;
}

.switch input:checked + .slider {
  background: var(--accent-gradient);
  border-color: transparent;
}

.switch input:checked + .slider:before {
  transform: translateX(22px);
  background-color: #ffffff;
  box-shadow: 0 0 8px rgba(59, 130, 246, 0.6);
}

/* Country Manager & Search */
.country-manager {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  max-height: 480px;
}

.search-wrapper {
  position: relative;
  margin-bottom: 14px;
}

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

#country-search {
  width: 100%;
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 10px;
  padding: 9px 36px 9px 36px;
  color: var(--text-primary);
  font-size: 0.85rem;
  transition: all var(--transition-fast);
}

#country-search:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.clear-search-btn {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  line-height: 1;
}

.clear-search-btn:hover {
  color: var(--text-primary);
}

/* Country List Scrollable Box */
.country-list {
  flex-grow: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-right: 4px;
}

.country-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.015);
  border: 1px solid rgba(255, 255, 255, 0.03);
  padding: 8px 12px;
  border-radius: 10px;
  transition: all var(--transition-fast);
}

.country-row:hover {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.08);
}

.country-label {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0; /* allows text truncation */
}

.group-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
  transition: background-color var(--transition-fast);
  box-shadow: 0 0 6px rgba(0, 0, 0, 0.3);
}

.country-name-text {
  font-size: 0.85rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Styled Select Dropdown */
.group-dropdown {
  background: rgba(13, 20, 35, 0.85);
  color: var(--text-primary);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  outline: none;
  transition: all var(--transition-fast);
}

.group-dropdown:focus {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

/* Loading & Empty States */
.loading-state, .empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 30px 10px;
  color: var(--text-secondary);
  font-size: 0.85rem;
  text-align: center;
}

.spinner {
  width: 24px;
  height: 24px;
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-top-color: var(--accent-blue);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Map Panel (Main Area) */
.map-panel {
  display: flex;
  flex-direction: column;
  position: relative;
  height: 100%;
  background: #f8fafc;
  overflow: hidden;
}

/* Map Viewport Container */
.map-viewport {
  flex-grow: 1;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
  cursor: grab;
  background: #ffffff; /* Solid white background for paper publishing compatibility */
}

.map-viewport:active {
  cursor: grabbing;
}

.map-placeholder {
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

/* SVG Europe Map Styles */
.map-viewport svg {
  width: 90%;
  height: 90%;
  max-width: 100%;
  max-height: 100%;
  transition: transform var(--transition-normal);
  filter: drop-shadow(0 10px 25px rgba(15, 23, 42, 0.08)); /* Softer shadow for white background */
  transform-origin: center center;
  user-select: none;
}

/* Dynamic styling for countries inside SVG */
.map-viewport svg path {
  fill: #f1f5f9; /* Neutral light slate gray for unassigned countries */
  stroke: #475569; /* Slate-600 outline for clean paper visibility */
  stroke-width: 0.8px;
  stroke-linejoin: round;
  transition: fill var(--transition-normal), stroke var(--transition-fast), filter var(--transition-fast);
  cursor: pointer;
}

.map-viewport svg path:hover {
  filter: brightness(0.92) drop-shadow(0 4px 12px rgba(15, 23, 42, 0.15));
  stroke: #0f172a;
  stroke-width: 1.2px;
}

/* Styling by dynamic group variables */
.map-viewport svg path[data-group="1"] { fill: var(--group-1-color); }
.map-viewport svg path[data-group="2"] { fill: var(--group-2-color); }
.map-viewport svg path[data-group="3"] { fill: var(--group-3-color); }
.map-viewport svg path[data-group="4"] { fill: var(--group-4-color); }
.map-viewport svg path[data-group="5"] { fill: var(--group-5-color); }

/* SVG Map Controls */
.map-controls {
  position: absolute;
  right: 24px;
  top: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 5;
}

.control-btn {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--panel-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--panel-border);
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
  transition: all var(--transition-fast);
}

.control-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--accent-blue);
  color: var(--text-primary);
  transform: translateY(-2px);
}

.control-btn:active {
  transform: translateY(0);
}

/* Floating Map Actions (Download) */
.map-actions {
  position: absolute;
  left: 24px;
  top: 24px;
  z-index: 5;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  border: none;
  padding: 10px 18px;
  border-radius: 12px;
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  font-size: 0.88rem;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.4);
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-primary:hover {
  box-shadow: 0 6px 24px rgba(59, 130, 246, 0.6);
  transform: translateY(-2px);
  filter: brightness(1.1);
}

.btn-primary:active {
  transform: translateY(0);
}

/* Legend & Tip Footer */
.map-footer {
  background: rgba(13, 20, 35, 0.85);
  backdrop-filter: blur(16px);
  border-top: 1px solid var(--panel-border);
  padding: 14px 28px;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  z-index: 5;
}

.legend-overlay {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  padding: 12px 24px;
  border-radius: 12px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  display: flex;
  align-items: center;
  gap: 14px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  z-index: 10;
}

.legend-title {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.legend-items {
  display: flex;
  gap: 18px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 500;
  color: #334155;
}

.legend-color-dot {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  display: inline-block;
  box-shadow: 0 0 4px rgba(0, 0, 0, 0.2);
  transition: background-color var(--transition-fast);
}

.tip-area {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Custom Interactive Tooltip */
.map-tooltip {
  position: absolute;
  pointer-events: none;
  background: rgba(9, 12, 22, 0.92);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  padding: 8px 12px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
  z-index: 100;
  transform: translate(15px, 15px);
  transition: opacity var(--transition-fast);
}

.tooltip-country {
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.tooltip-group {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
}

/* Utilities */
.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Responsive Rules */
@media (max-width: 1024px) {
  .app-content {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
    overflow-y: auto;
  }
  
  .sidebar {
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--panel-border);
    max-height: 500px;
  }
  
  .map-panel {
    height: 600px;
  }
}