/* ===================================
   CSS Variables & Design System
   =================================== */
:root {
  /* Colors - Modern dark theme */
  --color-bg-primary: #0f0f23;
  --color-bg-secondary: #1a1a2e;
  --color-bg-tertiary: #16213e;
  --color-bg-card: rgba(26, 26, 46, 0.9);
  --color-bg-glass: rgba(255, 255, 255, 0.05);

  --color-text-primary: #ffffff;
  --color-text-secondary: #a0a0b8;
  --color-text-muted: #6b6b80;

  --color-accent-primary: #3b82f6;
  --color-accent-secondary: #8b5cf6;
  --color-accent-gradient: linear-gradient(135deg, #3b82f6and #8b5cf6);

  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;

  --color-border: rgba(255, 255, 255, 0.1);
  --color-border-hover: rgba(255, 255, 255, 0.2);

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(59, 130, 246, 0.3);

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  /* Border radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;

  /* Z-index layers */
  --z-sidebar: 100;
  --z-header: 200;
  --z-modal-backdrop: 300;
  --z-modal: 400;
  --z-tooltip: 500;
}

/* ===================================
   Reset & Base Styles
   =================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-md);
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  background-image:
    radial-gradient(ellipse at top right, rgba(59, 130, 246, 0.1) 0%, transparent 50%),
    radial-gradient(ellipse at bottom left, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
}

#app {
  display: flex;
  flex-direction: column;
  height: 100%;
}

/* ===================================
   Typography
   =================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 600;
  line-height: 1.3;
}

h1 {
  font-size: var(--font-size-2xl);
}

h2 {
  font-size: var(--font-size-xl);
}

h3 {
  font-size: var(--font-size-lg);
}

a {
  color: var(--color-accent-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent-secondary);
}

/* ===================================
   Header
   =================================== */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-xl);
  background: var(--color-bg-card);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  z-index: var(--z-header);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.header-logo {
  font-size: 1.75rem;
}

.header-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  background: linear-gradient(135deg, #fff 0%, #a0a0b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.auth-buttons {
  display: flex;
  gap: var(--spacing-sm);
}

.user-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.username {
  font-weight: 500;
  color: var(--color-text-secondary);
}

/* ===================================
   Buttons
   =================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-family: inherit;
  font-size: var(--font-size-sm);
  font-weight: 500;
  line-height: 1;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  color: white;
  box-shadow: var(--shadow-sm), 0 0 20px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md), 0 0 30px rgba(59, 130, 246, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn-outline:hover {
  background: var(--color-bg-glass);
  border-color: var(--color-border-hover);
}

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

.btn-danger:hover {
  background: #dc2626;
}

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: var(--font-size-xs);
}

.btn-full {
  width: 100%;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* ===================================
   Main Content Layout
   =================================== */
.main-content {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ===================================
   Sidebar
   =================================== */
.sidebar {
  width: 320px;
  background: var(--color-bg-card);
  backdrop-filter: blur(20px);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  z-index: var(--z-sidebar);
  overflow: hidden;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.sidebar-header h2 {
  font-size: var(--font-size-md);
  font-weight: 600;
}

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 24px;
  padding: 0 var(--spacing-sm);
  font-size: var(--font-size-xs);
  font-weight: 600;
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  color: white;
  border-radius: var(--radius-full);
}

.login-prompt {
  padding: var(--spacing-xl);
  text-align: center;
  color: var(--color-text-secondary);
}

.selections-list {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-md);
}

.selection-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--color-bg-glass);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.selection-item:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--color-border-hover);
  transform: translateX(4px);
}

.selection-color {
  width: 12px;
  height: 12px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
  margin-top: 4px;
}

.selection-info {
  flex: 1;
  min-width: 0;
}

.selection-name {
  font-weight: 500;
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.selection-type {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.selection-notes {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  margin-top: var(--spacing-xs);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Sidebar Header Actions */
.sidebar-header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* ===================================
   Grouped City Selections
   =================================== */
.country-group {
  margin-bottom: var(--spacing-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.country-group-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  background: var(--color-bg-glass);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.country-group-header:hover {
  background: rgba(255, 255, 255, 0.08);
}

.expand-icon {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  width: 16px;
  transition: transform var(--transition-fast);
}

.country-color {
  width: 10px;
  height: 10px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.country-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.country-name {
  font-weight: 500;
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
}

.city-count {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* Sidebar Toggle */
.sidebar-toggle {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--color-text-primary);
  cursor: pointer;
  padding: var(--spacing-xs);
  margin-right: var(--spacing-sm);
  display: none;
  transition: color var(--transition-fast);
  z-index: 1000;
  /* Ensure it's above other elements */
  position: relative;
  /* Ensure z-index applies */
}

.group-edit-btn {
  background: transparent;
  border: none;
  font-size: var(--font-size-sm);
  cursor: pointer;
  padding: var(--spacing-xs);
  border-radius: var(--radius-sm);
  opacity: 0.6;
  transition: all var(--transition-fast);
}

.group-edit-btn:hover {
  opacity: 1;
  background: rgba(255, 255, 255, 0.1);
}

.country-cities {
  display: none;
  background: rgba(0, 0, 0, 0.2);
}

.country-cities.expanded {
  display: block;
}

.city-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  padding-left: calc(var(--spacing-md) + 24px);
  cursor: pointer;
  transition: background var(--transition-fast);
  border-top: 1px solid var(--color-border);
}

.city-item:hover {
  background: rgba(255, 255, 255, 0.05);
}

.city-color {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
  margin-top: 4px;
}

.city-info {
  flex: 1;
  min-width: 0;
}

.city-name {
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.city-notes {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* ===================================
   Search Section
   =================================== */
.search-section {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

.search-section h3 {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.search-input-wrapper {
  position: relative;
}

.search-input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-family: inherit;
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  background: var(--color-bg-glass);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: all var(--transition-fast);
}

.search-input:focus {
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.search-input::placeholder {
  color: var(--color-text-muted);
}

.search-results {
  position: absolute;
  bottom: 100%;
  left: 0;
  right: 0;
  max-height: 250px;
  overflow-y: auto;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-xs);
  display: none;
  z-index: 100;
  box-shadow: var(--shadow-lg);
}

.search-results.active {
  display: block;
}

.search-result-item {
  padding: var(--spacing-sm) var(--spacing-md);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.search-result-item:hover {
  background: var(--color-bg-glass);
}

.search-result-name {
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.search-result-country {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.search-category {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--color-border);
}

/* ===================================
   Map Container
   =================================== */
.map-container {
  flex: 1;
  position: relative;
  background: var(--color-bg-primary);
}

#map {
  width: 100%;
  height: 100%;
}

.map-loading {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  background: var(--color-bg-primary);
  color: var(--color-text-secondary);
  z-index: 10;
}

.map-loading.hidden {
  display: none;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Leaflet customization */
.leaflet-container {
  background: var(--color-bg-primary);
  font-family: var(--font-family);
}

.leaflet-popup-content-wrapper {
  background: var(--color-bg-card);
  color: var(--color-text-primary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
}

.leaflet-popup-tip {
  background: var(--color-bg-card);
}

.leaflet-popup-content {
  margin: var(--spacing-md);
}

.leaflet-popup-content h4 {
  margin-bottom: var(--spacing-xs);
}

.leaflet-popup-content p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  margin: 0;
}

.leaflet-popup-content .btn {
  margin-top: var(--spacing-sm);
}

.leaflet-control-zoom {
  border: none !important;
  box-shadow: var(--shadow-md) !important;
}

.leaflet-control-zoom a {
  background: var(--color-bg-card) !important;
  color: var(--color-text-primary) !important;
  border: 1px solid var(--color-border) !important;
}

.leaflet-control-zoom a:hover {
  background: var(--color-bg-secondary) !important;
}

/* ===================================
   Modal
   =================================== */
.modal {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  padding: var(--spacing-lg);
}

.modal.active {
  display: flex;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  z-index: var(--z-modal-backdrop);
}

.modal-content {
  position: relative;
  width: 100%;
  max-width: 420px;
  max-height: 90vh;
  overflow-y: auto;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-2xl);
  z-index: var(--z-modal);
  animation: modalIn 0.3s ease;
}

.modal-sm {
  max-width: 360px;
}

.modal-lg {
  max-width: 700px;
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(-10px);
  }

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

.modal-close {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--color-text-muted);
  background: transparent;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-glass);
}

.modal-actions {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.modal-actions .btn {
  flex: 1;
}

/* ===================================
   Forms
   =================================== */
.auth-form h2 {
  margin-bottom: var(--spacing-xs);
}

.auth-subtitle {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-xl);
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xs);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-family: inherit;
  font-size: var(--font-size-md);
  color: var(--color-text-primary);
  background: var(--color-bg-glass);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.form-group input[type="color"] {
  height: 44px;
  padding: var(--spacing-xs);
  cursor: pointer;
}

.form-hint {
  display: block;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--spacing-xs);
}

.error-message {
  color: var(--color-danger);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-md);
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(239, 68, 68, 0.1);
  border-radius: var(--radius-sm);
  display: none;
}

.error-message.active {
  display: block;
}

.auth-switch {
  text-align: center;
  margin-top: var(--spacing-lg);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.select-input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-family: inherit;
  font-size: var(--font-size-md);
  color: var(--color-text-primary);
  background: var(--color-bg-glass);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  cursor: pointer;
}

/* ===================================
   Compare Section
   =================================== */
.compare-container {
  margin-top: var(--spacing-lg);
}

.compare-user-select {
  margin-bottom: var(--spacing-xl);
}

.compare-user-select label {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.compare-results {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
}

.compare-column {
  background: var(--color-bg-glass);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
}

.compare-column h3 {
  font-size: var(--font-size-md);
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--color-border);
}

.compare-stat {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) 0;
}

.compare-stat-label {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.compare-stat-value {
  font-weight: 600;
  color: var(--color-accent-primary);
}

.compare-common {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--spacing-lg);
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(139, 92, 246, 0.1));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.compare-common h4 {
  color: var(--color-accent-primary);
  margin-bottom: var(--spacing-sm);
}

.compare-common-count {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.compare-section {
  margin-bottom: var(--spacing-md);
}

.compare-section h4 {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xs);
}

.compare-list {
  list-style: none;
  padding: 0;
  margin: 0;
  max-height: 150px;
  overflow-y: auto;
  background: rgba(0, 0, 0, 0.2);
  border-radius: var(--radius-sm);
  padding: var(--spacing-sm);
}

.compare-list li {
  font-size: var(--font-size-sm);
  padding: var(--spacing-xs) 0;
  border-bottom: 1px solid var(--color-border);
}

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

.compare-list li.empty {
  color: var(--color-text-muted);
  font-style: italic;
}

.common-list {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-top: var(--spacing-sm);
  text-align: left;
  padding: var(--spacing-sm);
  background: rgba(0, 0, 0, 0.2);
  border-radius: var(--radius-sm);
}

.common-list strong {
  color: var(--color-text-primary);
}

.export-btn {
  margin-top: var(--spacing-lg);
  padding: var(--spacing-sm) var(--spacing-lg);
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.export-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md), 0 0 20px rgba(59, 130, 246, 0.4);
}

/* ===================================
   Scrollbar
   =================================== */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-border-hover);
}

/* ===================================
   Responsive
   =================================== */
@media (max-width: 768px) {
  .sidebar {
    position: absolute;
    left: 0;
    top: 60px;
    bottom: 0;
    width: 100%;
    max-width: 320px;
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .header {
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .sidebar-toggle {
    display: block;
  }

  .header-title {
    display: block;
  }

  .header-title {
    font-size: var(--font-size-md);
  }

  .modal-content {
    padding: var(--spacing-lg);
  }

  .compare-results {
    grid-template-columns: 1fr;
  }
}