/* Smart Tracker Design System */

:root {
  --bg-color: #080b11;
  --panel-bg: rgba(17, 24, 39, 0.7);
  --card-bg: rgba(31, 41, 55, 0.45);
  --border-color: rgba(55, 65, 81, 0.4);
  --border-hover: rgba(99, 102, 241, 0.4);
  
  --primary: #6366f1;
  --primary-glow: rgba(99, 102, 241, 0.25);
  --primary-hover: #4f46e5;
  --accent: #a855f7;
  --accent-glow: rgba(168, 85, 247, 0.25);

  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-disabled: #4b5563;

  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.1);
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.1);
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.1);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-lg: 0 10px 30px -10px rgba(0, 0, 0, 0.7);
}

/* Base Styles & Reset */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Inter', sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* Background Glowing Circles */
.bg-glow {
  position: fixed;
  width: 40vw;
  height: 40vw;
  border-radius: 50%;
  filter: blur(140px);
  z-index: -1;
  pointer-events: none;
  opacity: 0.45;
}

.glow-1 {
  background: var(--primary-glow);
  top: -10%;
  left: -10%;
}

.glow-2 {
  background: var(--accent-glow);
  bottom: -10%;
  right: -10%;
}

/* Main Container Layout */
.app-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  min-height: 100vh;
}

/* Header */
.app-header {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

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

.header-logo svg {
  filter: drop-shadow(0 0 8px var(--primary-glow));
}

.header-logo h1 {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.05em;
  background: linear-gradient(135deg, var(--text-main) 30%, #d1d5db 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.header-logo h1 span {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.header-subtitle {
  color: var(--text-muted);
  font-size: 1.05rem;
  font-weight: 400;
}

/* Main Layout: Split Columns */
.main-layout {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 2rem;
  align-items: start;
}

/* Glassmorphism Panel styles */
.sidebar-panel, .results-panel {
  background: var(--panel-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px stroke var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-lg);
}

.sidebar-panel {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  position: sticky;
  top: 2rem;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.panel-header h2 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* Add Item Form */
.add-item-form {
  display: flex;
  gap: 0.5rem;
}

input[type="text"] {
  flex: 1;
  background: rgba(17, 24, 39, 0.6);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  color: var(--text-main);
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition);
}

input[type="text"]:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-glow);
}

/* Buttons */
.btn-icon {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-icon:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
}

.btn-primary-sm {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  border: none;
  padding: 1rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-weight: 700;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: var(--transition);
  box-shadow: 0 4px 15px -2px var(--primary-glow);
}

.btn-primary:hover {
  filter: brightness(1.15);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px -2px var(--primary-glow);
}

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

.btn-full-width {
  width: 100%;
}

/* Checklist Items */
.checklist-container {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  max-height: 400px;
  overflow-y: auto;
  padding-right: 0.25rem;
}

.checklist-container::-webkit-scrollbar {
  width: 5px;
}

.checklist-container::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

.checklist-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0.85rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  cursor: pointer;
}

.checklist-item:hover {
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--border-hover);
}

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

.custom-checkbox {
  width: 18px;
  height: 18px;
  border: 2px solid var(--border-color);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.checklist-item.selected .custom-checkbox {
  background: var(--primary);
  border-color: var(--primary);
}

.custom-checkbox svg {
  opacity: 0;
  transform: scale(0.6);
  transition: var(--transition);
  color: white;
}

.checklist-item.selected .custom-checkbox svg {
  opacity: 1;
  transform: scale(1);
}

.item-label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: var(--transition);
  user-select: none;
}

.checklist-item.selected .item-label {
  color: var(--text-main);
}

.btn-delete-item {
  opacity: 0;
  color: var(--text-disabled);
  transition: var(--transition);
}

.checklist-item:hover .btn-delete-item {
  opacity: 1;
}

.btn-delete-item:hover {
  color: var(--danger);
}

/* Results Panel Styling */
.results-panel {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  min-height: 500px;
}

/* Search Bar */
.search-bar-container {
  width: 100%;
}

.search-input-wrapper {
  display: flex;
  align-items: center;
  background: rgba(17, 24, 39, 0.6);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.4rem;
  padding-left: 1rem;
  transition: var(--transition);
}

.search-input-wrapper:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-glow);
}

.search-icon {
  color: var(--text-muted);
  margin-right: 0.5rem;
}

#input-quick-search {
  flex: 1;
  background: transparent;
  border: none;
  padding: 0.6rem 0.5rem;
  color: var(--text-main);
  font-size: 0.95rem;
  outline: none;
}

.btn-secondary-sm {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
}

.btn-secondary-sm:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--text-muted);
}

/* Summary Cards (Stats) */
.dashboard-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.dashboard-summary.hidden {
  display: none !important;
}

.summary-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.summary-label {
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.summary-value {
  font-size: 1.4rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--text-main) 50%, #9ca3af 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

#sum-total-price {
  background: linear-gradient(135deg, #10b981, #34d399);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Empty State & Loader Skeleton */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 5rem 2rem;
  text-align: center;
  color: var(--text-muted);
}

.empty-state svg {
  color: var(--text-disabled);
  animation: float 4s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.empty-state h3 {
  font-size: 1.15rem;
  color: var(--text-main);
  font-weight: 600;
}

.empty-state p {
  max-width: 320px;
  font-size: 0.85rem;
  line-height: 1.5;
}

/* Skeleton Loading Animation */
.skeleton-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 1rem;
  position: relative;
  overflow: hidden;
}

.skeleton-card::after {
  content: "";
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  transform: translateX(-100%);
  background-image: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0) 0%,
    rgba(255, 255, 255, 0.03) 20%,
    rgba(255, 255, 255, 0.07) 60%,
    rgba(255, 255, 255, 0) 100%
  );
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  100% { transform: translateX(100%); }
}

.skeleton-text {
  height: 20px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 4px;
}

.skeleton-title { width: 40%; }
.skeleton-best-offer { height: 70px; }
.skeleton-list { height: 100px; }

/* Results Feed & Result Cards */
.results-feed {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.result-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.result-card:hover {
  border-color: var(--border-hover);
  box-shadow: 0 4px 20px -5px rgba(99, 102, 241, 0.1);
}

.result-card-header {
  padding: 1.25rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  user-select: none;
}

.result-card-title-section {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.result-badge-searched {
  font-size: 0.7rem;
  text-transform: uppercase;
  font-weight: 700;
  background: var(--primary-glow);
  color: #c7d2fe;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  letter-spacing: 0.05em;
}

.result-card-title-section h3 {
  font-size: 1.05rem;
  font-weight: 600;
}

.result-card-chevron {
  color: var(--text-muted);
  transition: var(--transition);
}

.result-card.expanded .result-card-chevron {
  transform: rotate(180deg);
}

.result-card-body {
  padding: 1.5rem;
  display: none;
  flex-direction: column;
  gap: 1.25rem;
}

.result-card.expanded .result-card-body {
  display: flex;
}

/* Best Offer Card (Hero Section) */
.best-offer-hero {
  background: rgba(16, 185, 129, 0.04);
  border: 1px solid rgba(16, 185, 129, 0.2);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: grid;
  grid-template-columns: 80px 1fr auto;
  align-items: center;
  gap: 1.25rem;
}

.best-offer-img {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-sm);
  background: #fff;
  padding: 0.25rem;
  object-fit: contain;
}

.best-offer-info {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.badge-cheapest {
  align-self: start;
  font-size: 0.65rem;
  font-weight: 800;
  background: var(--success);
  color: #fff;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.best-offer-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.best-offer-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.best-offer-store {
  font-weight: 700;
  color: #34d399;
}

.best-offer-pricing {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.35rem;
}

.best-offer-price {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--success);
}

.btn-buy {
  background: var(--success);
  color: #fff;
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 700;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.btn-buy:hover {
  background: #059669;
  transform: translateY(-1px);
}

/* Offers Table/List */
.other-offers-section h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.offers-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.offer-row {
  display: grid;
  grid-template-columns: 1fr auto auto auto;
  align-items: center;
  gap: 1.5rem;
  padding: 0.85rem 1.25rem;
  background: rgba(255, 255, 255, 0.015);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.offer-row:hover {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--border-hover);
}

.offer-row-title {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.offer-row-store {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
}

.offer-row-price {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
}

.btn-link-sm {
  color: var(--primary);
  text-decoration: none;
  font-size: 0.8rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  transition: var(--transition);
}

.btn-link-sm:hover {
  color: #818cf8;
  text-decoration: underline;
}

.no-results-card {
  padding: 2.5rem;
  text-align: center;
  color: var(--text-muted);
  background: rgba(239, 68, 68, 0.015);
  border: 1px dashed rgba(239, 68, 68, 0.2);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.no-results-card svg {
  color: var(--danger);
}

.no-results-card h4 {
  font-size: 1rem;
  color: var(--text-main);
  font-weight: 600;
}

.no-results-card p {
  font-size: 0.8rem;
  max-width: 280px;
  line-height: 1.5;
}

/* Responsiveness & Mobile UI Optimization (Android/iOS) */
.mobile-tabs-container {
  display: none;
  background: rgba(17, 24, 39, 0.6);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.35rem;
  gap: 0.35rem;
  margin-bottom: 0.5rem;
}

.tab-button {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.8rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
}

.tab-button.active {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 12px -2px var(--primary-glow);
}

/* Other Offers Collapsible Styles */
.other-offers-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
  cursor: pointer;
  padding-bottom: 0.5rem;
  border-bottom: 1px dashed var(--border-color);
  user-select: none;
}

.other-offers-header h4 {
  margin-bottom: 0 !important;
}

.btn-toggle-offers {
  background: rgba(99, 102, 241, 0.1);
  color: #a5b4fc;
  border: 1px solid rgba(99, 102, 241, 0.25);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.35rem 0.75rem;
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition);
}

.btn-toggle-offers:hover {
  background: var(--primary-glow);
  color: #fff;
}

.other-offers-section .offer-row.hidden-offer {
  display: none !important;
}

.other-offers-section.show-all .offer-row.hidden-offer {
  display: grid !important;
}

@media (max-width: 1024px) {
  .mobile-tabs-container {
    display: flex;
  }

  .main-layout {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .sidebar-panel {
    position: static;
  }

  /* Handle showing/hiding panels based on active tab */
  .sidebar-panel.hidden-mobile, .results-panel.hidden-mobile {
    display: none !important;
  }
}

@media (max-width: 640px) {
  .app-container {
    padding: 1.25rem 0.75rem;
    gap: 1.25rem;
  }

  .app-header h1 {
    font-size: 1.8rem;
  }

  .app-header p {
    font-size: 0.9rem;
  }

  /* Centering card headers on mobile */
  .result-card-header {
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    text-align: center !important;
    justify-content: center !important;
    padding: 1.25rem 1rem !important;
    width: 100% !important;
  }

  .result-card-title-section {
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    text-align: center !important;
    width: 100% !important;
    gap: 0.5rem !important;
  }

  .result-badge-searched {
    display: inline-block !important;
    margin: 0 auto !important;
    align-self: center !important;
  }

  .result-card-title-section h3 {
    display: block !important;
    width: 100% !important;
    text-align: center !important;
    margin: 0 !important;
    font-size: 0.95rem !important;
    line-height: 1.4 !important;
  }
  
  .result-card-chevron {
    display: block !important;
    margin: 0 auto !important;
  }
  
  .dashboard-summary {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }
  
  .best-offer-hero {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
    gap: 1rem;
  }
  
  .best-offer-pricing {
    align-items: center;
    width: 100%;
  }

  .best-offer-price {
    font-size: 1.35rem;
  }

  .btn-buy {
    width: 100%;
    justify-content: center;
  }
  
  /* Symmetrical centered grid for other offers rows */
  .offer-row {
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    padding: 1.15rem 1rem;
    align-items: center;
  }
  
  .offer-row-title {
    grid-column: span 2;
    text-align: center;
    white-space: normal;
    font-size: 0.85rem;
    line-height: 1.4;
  }

  .offer-row-store {
    grid-column: 1;
    justify-self: center;
    margin: 0;
  }

  .offer-row-price {
    grid-column: 2;
    justify-self: center;
    font-weight: 700;
  }

  .btn-link-sm {
    grid-column: span 2;
    justify-self: center;
    background: rgba(99, 102, 241, 0.08);
    border: 1px solid rgba(99, 102, 241, 0.2);
    padding: 0.5rem 1.5rem;
    border-radius: var(--radius-sm);
    width: 100%;
    justify-content: center;
    margin-top: 0.25rem;
  }
}