:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --accent-color: #f59e0b;
  --background-color: #f8fafc;
  --surface-color: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --border-color: #e2e8f0;
  --border-hover: #cbd5e1;
  --success-color: #10b981;
  --success-light: #ecfdf5;
  --danger-color: #ef4444;
  --danger-light: #fef2f2;
  --radius-sm: 6px;
  --radius: 12px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.03);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--background-color);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

header {
  background-color: var(--surface-color);
  padding: 0.9rem 1.5rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border-color);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--text-primary);
}

.brand-icon {
  font-size: 1.6rem;
}

.brand-text {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.user-nav {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.live-sync-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: #16a34a;
  background: #f0fdf4;
  padding: 0.2rem 0.5rem;
  border-radius: 12px;
  border: 1px solid #bbf7d0;
}

.pulse-dot {
  width: 7px;
  height: 7px;
  background-color: #16a34a;
  border-radius: 50%;
  animation: pulse-green 2s infinite;
}

@keyframes pulse-green {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(22, 163, 74, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(22, 163, 74, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(22, 163, 74, 0); }
}

main {
  max-width: 800px;
  margin: 1.5rem auto;
  padding: 0 1rem;
}

/* Cards */
.card {
  background-color: var(--surface-color);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  margin-bottom: 1.25rem;
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.1rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
  font-size: 0.9rem;
  gap: 0.4rem;
}

.btn-primary {
  background-color: var(--primary-color);
  color: #fff;
}
.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: #f1f5f9;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}
.btn-secondary:hover {
  background-color: #e2e8f0;
}

.btn-danger {
  background-color: var(--danger-color);
  color: #fff;
}
.btn-danger:hover {
  background-color: #dc2626;
}

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

.btn-sm {
  padding: 0.35rem 0.65rem;
  font-size: 0.8rem;
}

.btn-icon {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.1rem;
  padding: 0.4rem;
  border-radius: 6px;
  color: var(--text-secondary);
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.btn-icon:hover {
  background-color: #f1f5f9;
  color: var(--danger-color);
}

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

.form-group label {
  display: block;
  margin-bottom: 0.35rem;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.form-control {
  width: 100%;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  background-color: #fff;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

/* Add Item Form Bar */
.add-item-bar {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.add-input-row {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.add-options-row {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  align-items: center;
}

/* Shopping Item List */
.item-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.item-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0.9rem;
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  gap: 0.75rem;
}

.item-row:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-sm);
}

.item-row.completed {
  background: #f8fafc;
  opacity: 0.75;
}

.item-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex: 1;
  min-width: 0;
}

/* Custom Checkbox */
.custom-checkbox {
  width: 22px;
  height: 22px;
  min-width: 22px;
  border: 2px solid #cbd5e1;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
  background: #fff;
}

.custom-checkbox:hover {
  border-color: var(--primary-color);
}

.custom-checkbox.checked {
  background-color: var(--success-color);
  border-color: var(--success-color);
  color: #fff;
}

.custom-checkbox.checked::after {
  content: '✓';
  font-size: 0.85rem;
  font-weight: 800;
}

.item-content {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.item-title {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text-primary);
  word-break: break-word;
  transition: color 0.15s ease;
}

.item-row.completed .item-title {
  text-decoration: line-through;
  color: var(--text-muted);
}

.item-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 0.15rem;
  flex-wrap: wrap;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.15rem 0.45rem;
  font-size: 0.72rem;
  font-weight: 600;
  border-radius: 4px;
}

.badge-qty {
  background: #f1f5f9;
  color: #334155;
}

.badge-alexa {
  background: #e0f2fe;
  color: #0369a1;
  gap: 0.2rem;
}

.badge-alexa::before {
  content: '🔊';
  font-size: 0.75rem;
}

.badge-user {
  background: #f3e8ff;
  color: #7e22ce;
}

/* Image Thumbnails */
.img-thumbnail {
  width: 42px;
  height: 42px;
  min-width: 42px;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  background-color: #f1f5f9;
}

.img-thumbnail:hover {
  transform: scale(1.08);
  box-shadow: 0 4px 10px rgba(0,0,0,0.12);
}

/* Image Modal / Lightbox */
.image-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.85);
  z-index: 10000;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.image-modal-content {
  position: relative;
  max-width: 90vw;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.image-modal-content img {
  max-width: 100%;
  max-height: 80vh;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  object-fit: contain;
}

.image-modal-close {
  position: absolute;
  top: -40px;
  right: 0;
  color: #ffffff;
  font-size: 2rem;
  font-weight: bold;
  cursor: pointer;
  background: none;
  border: none;
}

.image-modal-title {
  color: #ffffff;
  margin-top: 0.75rem;
  font-size: 0.95rem;
  text-align: center;
  font-weight: 500;
}

/* Responsive Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-bottom: 0.5rem;
}

.table {
  width: 100%;
  border-collapse: collapse;
}

.table th, .table td {
  padding: 0.8rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.table th {
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.85rem;
  background: #f8fafc;
}

/* Mobile Media Queries */
@media (max-width: 600px) {
  main {
    margin: 1rem auto;
    padding: 0 0.75rem;
  }
  .card {
    padding: 1rem;
  }
  header {
    padding: 0.75rem 1rem;
  }
  .brand-text {
    font-size: 1.1rem;
  }
  .add-input-row {
    flex-direction: column;
    align-items: stretch;
  }
  .table-responsive .table {
    min-width: 520px;
  }
  .table th, .table td {
    padding: 0.65rem 0.5rem;
    font-size: 0.82rem;
  }
}