/* ===== RESET & BASE ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

:root {
  --bg: #0f0f1a;
  --surface: #1a1a2e;
  --surface2: #252540;
  --surface3: #30305a;
  --primary: #6c63ff;
  --primary-dark: #5a52d5;
  --success: #2ecc71;
  --danger: #e74c3c;
  --warning: #f39c12;
  --text: #f0f0f0;
  --text-dim: #8888aa;
  --radius: 16px;
  --radius-sm: 10px;
  --header-height: 60px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-top: env(safe-area-inset-top, 0px);
}

html, body {
  height: 100%;
  overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro', 'Helvetica Neue', sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

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

/* ===== HEADER ===== */
#header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 20px;
  padding-top: calc(12px + var(--safe-top));
  background: var(--surface);
  border-bottom: 1px solid var(--surface2);
  flex-shrink: 0;
}

#header h1 {
  font-size: 20px;
  font-weight: 700;
  white-space: nowrap;
  width: 120px;
  flex-shrink: 0;
}

#cart-badge {
  background: var(--primary);
  color: white;
  padding: 8px 16px;
  border-radius: 20px;
  font-weight: 600;
  font-size: 16px;
  cursor: pointer;
  transition: transform 0.15s;
}

#cart-badge:active {
  transform: scale(0.95);
}

.hidden { display: none !important; }

/* ===== MAIN ===== */
#main {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.page {
  display: none;
  padding: 16px;
  padding-bottom: 20px;
  min-height: 100%;
}

.page.active {
  display: block;
}

/* ===== CATEGORIES BAR ===== */
.categories-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 4px 0 16px;
}

.cat-btn {
  padding: 10px 16px;
  border-radius: 24px;
  border: 2px solid var(--surface3);
  background: var(--surface);
  color: var(--text-dim);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

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

.cat-btn:active {
  transform: scale(0.95);
}

/* ===== PRODUCTS GRID ===== */
.catalog-layout {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.products-grid {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 14px;
}

/* ===== MINI CART ===== */
.mini-cart {
  width: 280px;
  flex-shrink: 0;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - var(--header-height) - 120px);
  position: sticky;
  top: 16px;
}

.mini-cart-header {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--surface2);
}

.mini-cart-items {
  flex: 1;
  overflow-y: auto;
  margin-bottom: 12px;
}

.mini-cart-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid var(--surface2);
  font-size: 13px;
}

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

.mini-cart-item-name {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-right: 8px;
}

.mini-cart-item-qty {
  color: var(--text-dim);
  font-size: 12px;
  margin-right: 8px;
}

.mini-cart-item-price {
  font-weight: 600;
  color: var(--primary);
  white-space: nowrap;
}

.mini-cart-total {
  padding-top: 12px;
  border-top: 2px solid var(--surface2);
  font-size: 16px;
  font-weight: 700;
  display: flex;
  justify-content: space-between;
}

.mini-cart-total .label {
  color: var(--text-dim);
}

.mini-cart-total .value {
  color: var(--success);
}

.mini-cart-empty {
  text-align: center;
  padding: 20px 0;
  color: var(--text-dim);
  font-size: 13px;
}

.product-card {
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.2s;
  border: 2px solid transparent;
}

.product-card:active {
  transform: scale(0.97);
}

.product-card.out-of-stock {
  opacity: 0.4;
  pointer-events: none;
}

.product-img-wrapper {
  cursor: pointer;
}

.product-img-wrapper:active {
  opacity: 0.8;
}

.product-img {
  width: 100%;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 64px;
  background: var(--surface2);
  overflow: hidden;
}

.product-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-info {
  padding: 12px;
}

.product-name {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
  line-height: 1.3;
}

.product-price {
  font-size: 16px;
  font-weight: 700;
  color: var(--primary);
}

.product-stock {
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 4px;
}

.product-cart-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 10px;
  padding: 8px;
  background: var(--surface2);
  border-radius: var(--radius-sm);
}

.qty-btn-sm {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: none;
  font-size: 18px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
}

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

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

.qty-btn-sm:active {
  transform: scale(0.9);
}

.qty-display {
  font-size: 16px;
  font-weight: 700;
  min-width: 24px;
  text-align: center;
}

/* ===== CART ===== */
.cart-items {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}

.cart-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 12px;
}

.cart-item-thumb {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  overflow: hidden;
  background: var(--surface2);
}

.cart-item-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cart-item-emoji-fallback {
  font-size: 36px;
}

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

.cart-item-name {
  font-weight: 600;
  font-size: 15px;
  margin-bottom: 2px;
}

.cart-item-price {
  color: var(--text-dim);
  font-size: 13px;
}

.cart-item-qty {
  display: flex;
  align-items: center;
  gap: 8px;
}

.qty-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: var(--surface3);
  color: var(--text);
  font-size: 20px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}

.qty-btn:active {
  background: var(--primary);
}

.qty-btn.danger:active {
  background: var(--danger);
}

.qty-value {
  font-size: 18px;
  font-weight: 700;
  min-width: 28px;
  text-align: center;
}

.cart-item-total {
  font-weight: 700;
  font-size: 16px;
  min-width: 80px;
  text-align: right;
}

/* Cart Promos */
.cart-promos {
  margin-bottom: 12px;
}

.promo-line {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: var(--surface);
  border-radius: var(--radius-sm);
  margin-bottom: 6px;
  font-size: 14px;
}

.promo-line.discount {
  border-left: 3px solid var(--success);
}

.promo-line.gift {
  border-left: 3px solid var(--warning);
}

/* Cart Total */
.cart-total {
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 16px;
  margin-bottom: 16px;
}

.cart-total-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 0;
  font-size: 15px;
}

.cart-total-row.grand {
  font-size: 22px;
  font-weight: 800;
  border-top: 2px solid var(--surface3);
  margin-top: 8px;
  padding-top: 12px;
}

.cart-total-row .label {
  color: var(--text-dim);
}

.cart-total-row.grand .label {
  color: var(--text);
}

.cart-total-row.grand .value {
  color: var(--success);
}

/* Cart Actions */
.cart-actions {
  display: flex;
  gap: 12px;
}

.cart-actions .btn-large {
  flex: 1;
}

.cart-empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-dim);
}

.cart-empty-icon {
  font-size: 64px;
  margin-bottom: 16px;
}

.cart-empty-text {
  font-size: 18px;
}

/* ===== BUTTONS ===== */
.btn {
  padding: 14px 24px;
  border-radius: var(--radius-sm);
  border: none;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn:active {
  transform: scale(0.97);
}

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

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

.btn-secondary {
  background: var(--surface2);
  color: var(--text);
}

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

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

.btn-large {
  padding: 18px 32px;
  font-size: 18px;
  border-radius: var(--radius);
}

/* ===== LOGS ===== */
.logs-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.logs-filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 8px 16px;
  border-radius: 20px;
  border: 2px solid var(--surface3);
  background: var(--surface);
  color: var(--text-dim);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

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

.filter-btn:active {
  transform: scale(0.95);
}

.logs-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.log-entry {
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 14px;
  border-left: 4px solid var(--surface3);
}

.log-entry.sale {
  border-left-color: var(--success);
}

.log-entry.return {
  border-left-color: var(--danger);
}

.log-entry.stock {
  border-left-color: var(--warning);
}

.log-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.log-type {
  font-weight: 700;
  font-size: 14px;
  text-transform: uppercase;
}

.log-type.sale { color: var(--success); }
.log-type.return { color: var(--danger); }
.log-type.stock { color: var(--warning); }

.log-time {
  font-size: 12px;
  color: var(--text-dim);
}

.log-details {
  font-size: 14px;
  color: var(--text-dim);
  line-height: 1.5;
}

.log-details .item-line {
  display: flex;
  justify-content: space-between;
}

.log-summary {
  margin-top: 6px;
  font-weight: 700;
  color: var(--text);
  font-size: 15px;
}

.logs-empty {
  text-align: center;
  padding: 40px;
  color: var(--text-dim);
  font-size: 16px;
}

/* ===== STATS ===== */
.stats-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.stats-empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-dim);
  font-size: 18px;
}

.stats-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.stats-section-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin: 0;
}

.stats-days,
.stats-categories {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.stat-day-card,
.stat-category-card {
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 14px;
}

.stat-day-date,
.stat-category-name {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--primary);
}

.stat-day-details,
.stat-category-details {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stat-day-row,
.stat-category-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
}

.stat-day-row .label,
.stat-category-row .label {
  color: var(--text-dim);
  flex: 1;
}

.stat-day-row .value,
.stat-category-row .value {
  font-weight: 600;
}

.stat-day-row .value.sales,
.stat-category-row .value.sales {
  color: var(--success);
}

.stat-day-row .value.returns,
.stat-category-row .value.returns {
  color: var(--danger);
}

.stat-day-row .count,
.stat-category-row .count {
  color: var(--text-dim);
  font-size: 12px;
  margin-left: 4px;
}

.stat-day-row.total,
.stat-category-row.total {
  margin-top: 6px;
  padding-top: 6px;
  border-top: 1px solid var(--surface2);
  font-weight: 700;
}

.stats-actions {
  margin-bottom: 16px;
}

.stat-day-categories {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--surface2);
  font-size: 12px;
  color: var(--text-dim);
  line-height: 1.6;
}

.stat-day-products {
  margin-top: 6px;
  padding-top: 6px;
  border-top: 1px dashed var(--surface2);
  font-size: 11px;
  color: var(--text-dim);
  line-height: 1.5;
  opacity: 0.85;
}

/* ===== STOCK PAGE ===== */
.stock-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}

.stock-footer {
  margin-top: 16px;
}

.stock-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 14px;
}

.stock-item-thumb {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  overflow: hidden;
  background: var(--surface2);
}

.stock-item-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.stock-item-emoji-fallback {
  font-size: 32px;
}

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

.stock-item-name {
  font-weight: 600;
  font-size: 15px;
}

.stock-item-price {
  font-size: 13px;
  color: var(--text-dim);
}

.stock-item-qty {
  display: flex;
  align-items: center;
  gap: 8px;
}

.stock-qty-value {
  font-size: 20px;
  font-weight: 800;
  min-width: 36px;
  text-align: center;
}

.stock-qty-value.zero {
  color: var(--danger);
}

.stock-qty-value.low {
  color: var(--warning);
}

.stock-actions {
  display: flex;
  gap: 6px;
}

.stock-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  font-size: 20px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
}

.stock-btn:active {
  transform: scale(0.9);
}

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

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

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

.stock-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

/* ===== TAB BAR ===== */
#tab-bar {
  display: flex;
  flex: 1;
  gap: 8px;
}

.tab {
  flex: 1;
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  padding: 8px 12px;
  border: none;
  background: none;
  color: var(--text-dim);
  cursor: pointer;
  transition: color 0.2s;
  gap: 6px;
  border-radius: var(--radius-sm);
}

.tab.active {
  color: var(--primary);
  background: var(--surface2);
}

.tab-icon {
  font-size: 18px;
}

.tab-label {
  font-size: 14px;
  font-weight: 600;
}

/* ===== MODAL ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn 0.2s;
}

.modal {
  background: var(--surface);
  border-radius: var(--radius) var(--radius) 0 0;
  width: 100%;
  max-width: 500px;
  max-height: 80vh;
  overflow-y: auto;
  padding: 24px;
  animation: slideUp 0.25s;
}

.modal h2 {
  font-size: 20px;
  margin-bottom: 16px;
}

.modal-actions {
  display: flex;
  gap: 10px;
  margin-top: 20px;
}

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

/* Product detail in modal */
.modal-product-img {
  width: 100%;
  max-width: 300px;
  aspect-ratio: 1;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 80px;
  text-align: center;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface2);
}

.modal-product-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.modal-product-name {
  font-size: 20px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 8px;
}

.modal-product-price {
  font-size: 24px;
  font-weight: 800;
  color: var(--primary);
  text-align: center;
  margin-bottom: 16px;
}

.modal-product-stock {
  text-align: center;
  color: var(--text-dim);
  margin-bottom: 20px;
}

/* Return modal */
.return-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  background: var(--surface2);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
}

.return-item-info {
  flex: 1;
}

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

.return-item-price {
  font-size: 13px;
  color: var(--text-dim);
}

/* Number input */
.number-input {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin: 20px 0;
}

.number-input input {
  width: 80px;
  height: 50px;
  text-align: center;
  font-size: 24px;
  font-weight: 700;
  border: 2px solid var(--surface3);
  border-radius: var(--radius-sm);
  background: var(--surface2);
  color: var(--text);
  outline: none;
}

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

.number-input .qty-btn {
  width: 48px;
  height: 48px;
  font-size: 24px;
}

/* ===== TOAST ===== */
.toast {
  position: fixed;
  bottom: calc(20px + var(--safe-bottom));
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface3);
  color: var(--text);
  padding: 12px 24px;
  border-radius: 24px;
  font-size: 15px;
  font-weight: 600;
  z-index: 2000;
  animation: toastIn 0.3s;
  white-space: nowrap;
  box-shadow: 0 4px 20px rgba(0,0,0,0.4);
}

.toast.success {
  background: var(--success);
}

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

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}

@keyframes toastIn {
  from { opacity: 0; transform: translateX(-50%) translateY(20px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ===== RESPONSIVE ===== */
@media (min-width: 768px) {
  .products-grid {
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 18px;
  }

  .modal {
    border-radius: var(--radius);
    max-width: 500px;
    margin-bottom: 20vh;
  }

  .modal-overlay {
    align-items: center;
  }
}