/* ============================================
   Household Replacement Tracker - Styles
   Mobile-First Responsive Design
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-success: #16a34a;
  --color-success-light: #dcfce7;
  --color-warning: #ea580c;
  --color-warning-light: #fff7ed;
  --color-danger: #dc2626;
  --color-danger-light: #fef2f2;
  
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-hover: #f1f5f9;
  
  --color-text: #0f172a;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;
  
  --color-border: #e2e8f0;
  --color-border-focus: #2563eb;
  
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
  
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  min-height: 100vh;
}

/* --- App Header --- */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-primary);
  color: white;
  padding: 0.75rem 1rem;
  box-shadow: var(--shadow-md);
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-left {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.app-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.025em;
}

.app-subtitle {
  font-size: 0.75rem;
  opacity: 0.8;
  display: none;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* --- Connection Status --- */
.connection-status {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.75rem;
  opacity: 0.9;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-warning);
}

.status-dot.connected {
  background-color: #4ade80;
  box-shadow: 0 0 6px rgba(74, 222, 128, 0.6);
}

.status-dot.disconnected {
  background-color: var(--color-danger);
  animation: pulse-disconnect 2s infinite;
}

@keyframes pulse-disconnect {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* --- Icon Button --- */
.icon-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  border: none;
  background: rgba(255,255,255,0.15);
  color: white;
  font-size: 1.25rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast);
}

.icon-btn:hover {
  background: rgba(255,255,255,0.25);
}

/* --- Filter Bar (Search + Tabs) --- */
.filter-bar {
  max-width: 1200px;
  margin: 0.75rem auto 0;
  padding: 0 1rem;
}

.search-box {
  position: relative;
  margin-bottom: 0.5rem;
}

.search-icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.875rem;
  pointer-events: none;
  opacity: 0.5;
}

.search-input {
  width: 100%;
  padding: 0.625rem 0.75rem 0.625rem 2.25rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  background: var(--color-surface);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

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

/* --- Filter Navigation --- */
.filter-nav {
  display: flex;
  gap: 0.25rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 0.25rem;
}

.filter-tab {
  padding: 0.5rem 1rem;
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  cursor: pointer;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
}

.filter-tab:hover {
  color: var(--color-primary);
}

.filter-tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  font-weight: 600;
}

/* --- Main Content --- */
.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem;
  padding-bottom: 2rem;
}

.view {
  display: none;
}

.view.active {
  display: block;
}

/* --- Items Grid --- */
.items-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

/* --- Item Card --- */
.item-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 1rem;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  border-left: 4px solid transparent;
}

.item-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.item-card.status-ok {
  border-left-color: var(--color-success);
}

.item-card.status-warning {
  border-left-color: var(--color-warning);
}

.item-card.status-overdue {
  border-left-color: var(--color-danger);
}

.item-card.status-usage {
  border-left-color: #8b5cf6;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.5rem;
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
}

.card-category {
  display: inline-block;
  padding: 0.125rem 0.5rem;
  border-radius: 99px;
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  font-size: 0.675rem;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.card-description {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.75rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-status {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8rem;
}

.status-badge {
  padding: 0.25rem 0.625rem;
  border-radius: 99px;
  font-weight: 500;
  font-size: 0.75rem;
}

.status-badge.ok {
  background: var(--color-success-light);
  color: var(--color-success);
}

.status-badge.warning {
  background: var(--color-warning-light);
  color: var(--color-warning);
}

.status-badge.overdue {
  background: var(--color-danger-light);
  color: var(--color-danger);
}

.status-badge.usage {
  background: #f3e8ff;
  color: #7c3aed;
}

.card-date-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.625rem;
}

.date-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.625rem;
  border-radius: 99px;
  background: var(--color-surface-hover);
  border: 1px solid var(--color-border);
  font-size: 0.75rem;
}

.date-tag-label {
  color: var(--color-text-secondary);
  font-weight: 500;
}

.date-tag-value {
  color: var(--color-text);
  font-weight: 600;
}

.card-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--color-border);
}

/* --- Progress Bar (for usage-based items) --- */
.progress-container {
  width: 100%;
  margin-top: 0.5rem;
}

.progress-bar-bg {
  height: 6px;
  background: var(--color-border);
  border-radius: 99px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  border-radius: 99px;
  transition: width var(--transition-normal);
}

.progress-bar-fill.low { background: var(--color-success); }
.progress-bar-fill.medium { background: var(--color-warning); }
.progress-bar-fill.high { background: #8b5cf6; }
.progress-bar-fill.critical { background: var(--color-danger); }

.progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.7rem;
  color: var(--color-text-muted);
  margin-top: 0.25rem;
}

/* --- Buttons --- */
.btn {
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-sm);
  border: none;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
}

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

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

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

.btn-secondary:hover {
  background: var(--color-border);
}

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

.btn-success:hover {
  background: #15803d;
}

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

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

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.8rem;
}

.btn-block {
  width: 100%;
}

/* --- One-Tap Replace Button --- */
.replace-btn {
  flex: 1;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  border: 2px solid var(--color-success);
  background: transparent;
  color: var(--color-success);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.replace-btn:hover {
  background: var(--color-success);
  color: white;
}

.usage-add-btn {
  flex: 1;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  border: 2px solid #8b5cf6;
  background: transparent;
  color: #7c3aed;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.usage-add-btn:hover {
  background: #7c3aed;
  color: white;
}

/* --- Empty State --- */
.empty-state {
  text-align: center;
  padding: 3rem 1rem;
}

.empty-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
}

.empty-state h2 {
  font-size: 1.25rem;
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

.empty-state p {
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
}

/* --- Detail View --- */
.detail-container {
  max-width: 700px;
  margin: 0 auto;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.375rem 0.75rem;
  border: none;
  background: transparent;
  color: var(--color-primary);
  font-size: 0.875rem;
  cursor: pointer;
  margin-bottom: 1rem;
}

.back-btn:hover {
  text-decoration: underline;
}

.detail-header {
  margin-bottom: 1.5rem;
}

.detail-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.detail-category {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 99px;
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  font-size: 0.8rem;
}

/* --- Detail Status Card --- */
.detail-status-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  margin-bottom: 1.5rem;
}

.status-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-border);
}

.status-row:last-child {
  border-bottom: none;
}

.status-label {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.status-value {
  font-weight: 600;
  font-size: 0.925rem;
}

/* --- Detail Actions --- */
.detail-actions {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

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

/* --- Detail Sections --- */
.detail-sections {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.detail-section h3 {
  font-size: 1rem;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

.detail-info-grid,
.part-info-grid {
  display: grid;
  gap: 0.75rem;
}

.info-item {
  background: var(--color-surface);
  padding: 0.75rem;
  border-radius: var(--radius-sm);
}

.info-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.025em;
  margin-bottom: 0.125rem;
}

.info-value {
  font-size: 0.925rem;
  word-break: break-word;
}

.info-value a {
  color: var(--color-primary);
  text-decoration: none;
}

.info-value a:hover {
  text-decoration: underline;
}

/* --- History List --- */
.history-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.history-item {
  background: var(--color-surface);
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.history-date {
  font-weight: 600;
  font-size: 0.875rem;
}

.history-notes {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.history-empty {
  text-align: center;
  padding: 1rem;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* --- Detail Footer Actions --- */
.detail-footer-actions {
  display: flex;
  gap: 0.75rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}

.detail-footer-actions .btn {
  flex: 1;
}

/* --- Modal Overlay --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.5);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal-overlay.active {
  display: flex;
}

/* --- Modal --- */
.modal {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.modal-small {
  max-width: 400px;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  background: var(--color-surface);
  z-index: 1;
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.modal-header h2 {
  font-size: 1.125rem;
  font-weight: 600;
}

.modal-close {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-close:hover {
  background: var(--color-surface-hover);
}

.modal-body {
  padding: 1.25rem;
}

/* --- Form Styles --- */
.form-section {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1rem;
  margin-bottom: 1rem;
}

.form-section legend {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  padding: 0 0.5rem;
}

.form-group {
  margin-bottom: 1rem;
}

.form-group:last-child {
  margin-bottom: 0;
}

.form-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: 0.375rem;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="number"],
.form-group input[type="date"],
.form-group input[type="url"],
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.625rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.925rem;
  font-family: inherit;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
  width: 18px;
  height: 18px;
}

.confirmation-text {
  font-size: 0.925rem;
  margin-bottom: 1rem;
  color: var(--color-text);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}

/* --- Toast Notifications --- */
.toast-container {
  position: fixed;
  bottom: 1rem;
  right: 1rem;
  z-index: 300;
  display: flex;
  flex-direction: column-reverse;
  gap: 0.5rem;
}

.toast {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--color-text);
  color: white;
  font-size: 0.875rem;
  box-shadow: var(--shadow-lg);
  animation: slide-in-right var(--transition-normal) ease-out;
  max-width: 320px;
}

.toast.success { background: var(--color-success); }
.toast.error { background: var(--color-danger); }
.toast.warning { background: var(--color-warning); }

@keyframes slide-in-right {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* --- Telegram Settings Styles --- */
.telegram-status-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  margin-bottom: 1.25rem;
}

.telegram-status-info {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}

.telegram-status-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
}

.telegram-status-value {
  font-weight: 600;
  font-size: 0.925rem;
}

.telegram-form-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}

.telegram-test-btn {
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  border: none;
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.telegram-disable-footer {
  display: none;
  justify-content: flex-end;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}

.due-items-preview {
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--color-border);
  display: none;
}

.due-items-preview h3 {
  font-size: 0.925rem;
  margin-bottom: 0.75rem;
  color: var(--color-text-secondary);
}

.due-category {
  margin-bottom: 0.75rem;
}

.due-category h4 {
  font-size: 0.8rem;
  margin-bottom: 0.375rem;
  color: var(--color-text-muted);
}

.due-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.375rem 0.5rem;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  margin-bottom: 0.25rem;
  font-size: 0.8rem;
}

.item-name {
  font-weight: 600;
}

.item-days {
  color: var(--color-text-muted);
  font-size: 0.75rem;
}

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

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 99px;
}

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

/* --- Loading Spinner --- */
.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* --- Responsive Breakpoints --- */

/* Tablet and up */
@media (min-width: 640px) {
  .items-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .app-subtitle {
    display: inline;
  }
}

/* Desktop and up */
@media (min-width: 1024px) {
  .items-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .detail-info-grid,
  .part-info-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* --- Login Overlay --- */
.login-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, var(--color-primary) 0%, #1e40af 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.login-container {
  background: white;
  border-radius: 16px;
  padding: 48px 40px;
  width: 90%;
  max-width: 420px;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.3);
  text-align: center;
}

.login-logo {
  font-size: 64px;
  margin-bottom: 16px;
}

.login-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-text);
  margin: 0 0 8px;
}

.login-subtitle {
  color: var(--color-text-muted);
  margin: 0 0 32px;
  font-size: 14px;
}

.login-form .form-group {
  text-align: left;
  margin-bottom: 20px;
}

.login-form label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-text);
  font-size: 14px;
}

.login-form input[type="text"],
.login-form input[type="password"] {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid #e5e7eb;
  border-radius: 8px;
  font-size: 16px;
  transition: border-color 0.2s, box-shadow 0.2s;
  box-sizing: border-box;
}

.login-form input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.login-error {
  background: #fef2f2;
  color: #dc2626;
  padding: 12px 16px;
  border-radius: 8px;
  margin-bottom: 20px;
  font-size: 14px;
  border: 1px solid #fecaca;
}

.btn-login {
  width: 100%;
  padding: 14px;
  font-size: 16px;
  margin-top: 8px;
}

/* --- Utility Classes --- */
.text-muted { color: var(--color-text-muted); }
.text-center { text-align: center; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* --- View Toggle --- */
.view-toggle {
  display: flex;
  gap: 0.25rem;
  margin-bottom: 0.75rem;
  justify-content: flex-end;
}

.view-toggle-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  font-size: 1.125rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.view-toggle-btn:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.view-toggle-btn.active {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

/* --- Calendar View --- */
.calendar-container {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.calendar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background: var(--color-primary);
  color: white;
}

.calendar-title {
  font-size: 1rem;
  font-weight: 600;
  flex: 1;
  text-align: center;
  margin: 0;
}

.calendar-nav-btn {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  border: none;
  background: rgba(255,255,255,0.15);
  color: white;
  font-size: 0.875rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast);
  flex-shrink: 0;
}

.calendar-nav-btn:hover {
  background: rgba(255,255,255,0.3);
}

.calendar-weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  padding: 0.5rem 0.25rem;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.calendar-weekdays div {
  text-align: center;
  font-size: 0.675rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 2px;
  padding: 0.25rem;
  background: var(--color-border);
}

.calendar-day {
  background: var(--color-surface);
  min-height: 60px;
  padding: 4px;
  cursor: pointer;
  transition: background var(--transition-fast);
  position: relative;
}

.calendar-day:hover {
  background: var(--color-primary-light);
}

.calendar-day.other-month {
  background: var(--color-bg);
  color: var(--color-text-muted);
}

.calendar-day.today {
  background: var(--color-primary-light);
}

.calendar-day-header {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-align: right;
  padding-right: 2px;
  line-height: 1;
}

.calendar-day.today .calendar-day-header {
  color: var(--color-primary);
  background: white;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-left: auto;
}

.calendar-events {
  margin-top: 2px;
  display: flex;
  flex-direction: column;
  gap: 1px;
  overflow: hidden;
}

.calendar-event {
  font-size: 0.575rem;
  padding: 1px 3px;
  border-radius: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.3;
  cursor: pointer;
}

.calendar-event:hover {
  filter: brightness(0.9);
}

.calendar-event.overdue {
  background: var(--color-danger-light);
  color: var(--color-danger);
  border-left: 2px solid var(--color-danger);
}

.calendar-event.due-today {
  background: var(--color-warning-light);
  color: var(--color-warning);
  border-left: 2px solid var(--color-warning);
}

.calendar-event.due-soon {
  background: #fef3c7;
  color: #92400e;
  border-left: 2px solid #f59e0b;
}

.calendar-event.ok {
  background: var(--color-success-light);
  color: var(--color-success);
  border-left: 2px solid var(--color-success);
}

.calendar-event.usage-based {
  background: #f3e8ff;
  color: #7c3aed;
  border-left: 2px solid #8b5cf6;
}

.calendar-more {
  font-size: 0.575rem;
  color: var(--color-primary);
  font-weight: 600;
  padding: 1px 3px;
  cursor: pointer;
}

.calendar-more:hover {
  text-decoration: underline;
}

/* --- Calendar Day Popup --- */
.calendar-day-popup-overlay {
  position: fixed;
  inset: 0;
  z-index: 500;
  background: rgba(0,0,0,0.4);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.calendar-day-popup-overlay.active {
  display: flex;
}

.calendar-day-popup {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 360px;
  max-height: 70vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.calendar-day-popup-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  background: var(--color-surface);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.calendar-day-popup-header h3 {
  font-size: 1rem;
  margin: 0;
}

.calendar-day-popup-close {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  font-size: 1.25rem;
  cursor: pointer;
  color: var(--color-text-secondary);
}

.calendar-day-popup-close:hover {
  background: var(--color-surface-hover);
}

.calendar-day-popup-body {
  padding: 0.75rem 1rem;
}

.calendar-popup-event {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem;
  border-radius: var(--radius-sm);
  margin-bottom: 0.375rem;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.calendar-popup-event:hover {
  background: var(--color-surface-hover);
}

.calendar-popup-event-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.calendar-popup-event-dot.overdue { background: var(--color-danger); }
.calendar-popup-event-dot.due-today { background: var(--color-warning); }
.calendar-popup-event-dot.due-soon { background: #f59e0b; }
.calendar-popup-event-dot.ok { background: var(--color-success); }
.calendar-popup-event-dot.usage-based { background: #8b5cf6; }

.calendar-popup-event-info {
  flex: 1;
  min-width: 0;
}

.calendar-popup-event-name {
  font-size: 0.825rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.calendar-popup-event-detail {
  font-size: 0.7rem;
  color: var(--color-text-muted);
}

.calendar-day-popup-empty {
  text-align: center;
  padding: 1.5rem 1rem;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* --- Responsive Calendar --- */
@media (min-width: 640px) {
  .calendar-day {
    min-height: 80px;
  }
  
  .calendar-event {
    font-size: 0.675rem;
  }
  
  .calendar-day-header {
    font-size: 0.75rem;
  }
}

@media (min-width: 1024px) {
  .calendar-day {
    min-height: 90px;
  }
  
  .calendar-event {
    font-size: 0.7rem;
  }
}

/* Hidden utility kept at the end so it wins over element display rules.
   No !important: JS toggles visibility via CSSOM (el.style.display). */
.hidden { display: none; }
.mt-8 { margin-top: 8px; }