:root {
  --primary-color: #FF6B6B;
  --primary-dark: #EE5253;
  --accent-color: #4ECDC4;
  --bg-color: #F7F9FC;
  --card-bg: #FFFFFF;
  --text-main: #2C3E50;
  --text-sub: #95A5A6;
  --border-color: #E0E6ED;
  --danger-color: #FF4757;
  --success-color: #2ED573;
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  --radius: 12px;
  --safe-area-bottom: env(safe-area-inset-bottom);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #1A1A2E;
    --card-bg: #16213E;
    --text-main: #E94560;
    --text-main: #F1F1F1;
    --text-sub: #8E9AAF;
    --border-color: #2F3640;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  }
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.5;
  overflow-x: hidden;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Background Canvas */
#particles-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

/* Container */
.app-container {
  max-width: 600px;
  margin: 0 auto;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  position: relative;
  background: rgba(255, 255, 255, 0.02); /* Glassmorphism hint */
  backdrop-filter: blur(2px);
}

/* Header */
header {
  padding: 20px;
  text-align: center;
}

h1 {
  font-size: 1.5rem;
  font-weight: 800;
  background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 4px;
}

.subtitle {
  font-size: 0.85rem;
  color: var(--text-sub);
}

/* Views */
.view {
  flex: 1;
  overflow-y: auto;
  padding: 0 16px 80px; /* Bottom padding for FAB/Safe area */
  display: none;
  animation: fadeIn 0.3s ease;
}

.view.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Cards & Sections */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 16px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
}

.section-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Category Selection Grid */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 10px;
}

.category-item {
  background: var(--bg-color);
  border: 2px solid var(--border-color);
  border-radius: 8px;
  padding: 10px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
  overflow: hidden;
}

.category-item.selected {
  border-color: var(--primary-color);
  background: rgba(255, 107, 107, 0.1);
  color: var(--primary-color);
  font-weight: 600;
}

.cat-count {
  font-size: 0.7rem;
  color: var(--text-sub);
  display: block;
  margin-top: 4px;
}

/* Controls */
.control-group {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 10px;
}

input[type="number"], input[type="text"] {
  width: 100%;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: var(--bg-color);
  color: var(--text-main);
  font-size: 1rem;
  outline: none;
  transition: border 0.2s;
}

input:focus {
  border-color: var(--primary-color);
}

/* Buttons */
.btn {
  border: none;
  border-radius: 8px;
  padding: 12px 20px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.1s, opacity 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
  width: 100%;
  box-shadow: 0 4px 10px rgba(255, 107, 107, 0.3);
}

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

.btn-outline {
  background: transparent;
  color: var(--primary-color);
  border: 1px solid var(--primary-color);
  padding: 8px 16px;
  font-size: 0.9rem;
}

.btn-danger {
  background: rgba(255, 71, 87, 0.1);
  color: var(--danger-color);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.8rem;
}

.btn-icon {
  padding: 8px;
  border-radius: 50%;
  width: 36px;
  height: 36px;
}

/* Animation for single row update */
.update-flash {
  animation: flash 0.5s ease;
}

@keyframes flash {
  0% { transform: scale(1); background-color: rgba(78, 205, 196, 0.3); }
  50% { transform: scale(1.02); background-color: rgba(78, 205, 196, 0.1); }
  100% { transform: scale(1); background-color: var(--card-bg); }
}

/* Note Icon */
.note-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  background: var(--text-sub);
  color: white;
  border-radius: 50%;
  font-size: 0.75rem;
  margin-left: 8px;
  cursor: pointer;
}
.note-badge.has-note {
  background: var(--accent-color);
}

/* List Selection in Dialog */
.list-select-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 200px;
  overflow-y: auto;
  margin-bottom: 16px;
}

.list-select-item {
  padding: 12px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all 0.2s;
}

.list-select-item:hover {
  background: var(--bg-color);
}

.list-select-item.selected {
  border-color: var(--primary-color);
  background: rgba(255, 107, 107, 0.05);
  color: var(--primary-color);
  font-weight: 600;
}

.list-select-item .check-icon {
  display: none;
}

.list-select-item.selected .check-icon {
  display: block;
}

/* Results */
.result-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 16px;
}

.result-card {
  background: white;
  padding: 16px;
  border-radius: var(--radius);
  border-left: 5px solid var(--accent-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--shadow);
  animation: slideIn 0.3s ease;
}

@media (prefers-color-scheme: dark) {
  .result-card {
    background: #1F2A40;
  }
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(-20px); }
  to { opacity: 1; transform: translateX(0); }
}

.result-name {
  font-size: 1.1rem;
  font-weight: 700;
}

.result-cat {
  font-size: 0.8rem;
  color: var(--text-sub);
}

.result-actions {
  display: flex;
  gap: 8px;
}

/* Management List */
.manage-list {
  list-style: none;
}

.manage-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-color);
}

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

.manage-info {
  flex: 1;
}

.manage-actions {
  display: flex;
  gap: 8px;
}

/* Floating Action Button (for Home/Manage toggle) */
.fab-container {
  position: fixed;
  bottom: calc(20px + var(--safe-area-bottom));
  right: 20px;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.fab {
  width: 50px;
  height: 50px;
  border-radius: 25px;
  background: var(--card-bg);
  color: var(--text-main);
  box-shadow: 0 4px 15px rgba(0,0,0,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  border: 1px solid var(--border-color);
  cursor: pointer;
}

.fab.primary {
  background: var(--primary-color);
  color: white;
  border: none;
}

/* Toast */
.toast-container {
  position: fixed;
  bottom: 100px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.toast {
  background: rgba(0, 0, 0, 0.8);
  color: white;
  padding: 10px 20px;
  border-radius: 20px;
  font-size: 0.9rem;
  animation: fadeUp 0.3s ease;
  backdrop-filter: blur(4px);
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Dialog */
.dialog-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

.dialog-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.dialog {
  background: var(--card-bg);
  width: 90%;
  max-width: 400px;
  border-radius: var(--radius);
  padding: 24px;
  transform: scale(0.9);
  transition: transform 0.2s;
  box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

.dialog-overlay.open .dialog {
  transform: scale(1);
}

.dialog-buttons {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 24px;
}

/* Tabs */
.tabs {
  display: flex;
  background: var(--bg-color);
  padding: 4px;
  border-radius: 8px;
  margin-bottom: 16px;
  border: 1px solid var(--border-color);
}

.tab {
  flex: 1;
  text-align: center;
  padding: 8px;
  font-size: 0.9rem;
  cursor: pointer;
  border-radius: 6px;
  color: var(--text-sub);
}

.tab.active {
  background: var(--card-bg);
  color: var(--primary-color);
  font-weight: 600;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-sub);
}

.tag {
  display: inline-block;
  padding: 2px 6px;
  background: rgba(78, 205, 196, 0.15);
  color: var(--accent-color);
  border-radius: 4px;
  font-size: 0.75rem;
  margin-right: 6px;
}