/* =====================================================================
       BASE RESET & LAYOUT SHELL
       ===================================================================== */

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

    html, body {
      height: 100%;
      overflow: hidden;
    }

    body {
      font-family: var(--font-body);
      font-size: var(--text-body);
      font-weight: var(--font-weight-regular);
      background-color: var(--color-bg-base);
      color: var(--color-text-primary);
      transition: background-color var(--duration-normal) var(--ease-in-out),
                  color var(--duration-normal) var(--ease-in-out);
      display: flex;
      flex-direction: column;
    }

    /* Dot-grid for modern theme (applied to body shell) */
    [data-theme="modern"] body,
    [data-theme="modern"].pos-shell {
      background-color: var(--color-bg-base);
      background-image: radial-gradient(
        circle,
        var(--dot-grid-color) 1px,
        transparent 1px
      );
      background-size: var(--dot-grid-size) var(--dot-grid-size);
    }

    /* =====================================================================
       STATUS BAR (very top)
       ===================================================================== */

    .status-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 36px;
      padding: 0 var(--space-5);
      background-color: var(--color-surface-3);
      border-bottom: 1px solid var(--color-border);
      font-size: var(--text-caption);
      font-weight: var(--font-weight-semibold);
      letter-spacing: var(--tracking-wider);
      text-transform: uppercase;
      color: var(--color-text-muted);
      flex-shrink: 0;
      z-index: var(--z-sticky);
    }

    [data-theme="industrial"] .status-bar {
      background-color: #111111;
      border-bottom-color: var(--color-primary-muted);
    }

    .status-bar__store {
      display: flex;
      align-items: center;
      gap: var(--space-3);
      color: var(--color-text-accent);
      font-family: var(--font-heading);
      font-weight: var(--heading-weight-primary);
      font-size: 0.8rem;
      letter-spacing: var(--tracking-widest);
    }

    .status-bar__store-dot {
      width: 7px;
      height: 7px;
      background-color: var(--color-success);
      border-radius: var(--radius-full);
      box-shadow: 0 0 6px var(--color-success);
      animation: pulse-dot 2.5s ease-in-out infinite;
    }

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

    .status-bar__center {
      display: flex;
      align-items: center;
      gap: var(--space-6);
    }

    .status-bar__right {
      display: flex;
      align-items: center;
      gap: var(--space-4);
    }

    .status-bar__user {
      display: flex;
      align-items: center;
      gap: var(--space-2);
      color: var(--color-text-secondary);
    }

    .status-bar__user-avatar {
      width: 20px;
      height: 20px;
      border-radius: var(--radius-full);
      background-color: var(--color-primary);
      color: var(--color-text-inverse);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.6rem;
      font-weight: var(--font-weight-bold);
    }

    /* Theme switcher inside status bar */
    .theme-switcher {
      display: flex;
      align-items: center;
      gap: var(--space-2);
      background-color: var(--color-surface-1);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-full);
      padding: 2px;
    }

    .theme-btn {
      display: flex;
      align-items: center;
      gap: var(--space-1);
      padding: 3px var(--space-3);
      border: none;
      border-radius: var(--radius-full);
      font-family: var(--font-body);
      font-size: 0.68rem;
      font-weight: var(--font-weight-semibold);
      letter-spacing: var(--tracking-wide);
      text-transform: uppercase;
      cursor: pointer;
      transition: var(--transition-fast);
      background: transparent;
      color: var(--color-text-muted);
    }

    .theme-btn.active {
      background-color: var(--color-primary);
      color: var(--color-text-inverse);
      box-shadow: var(--shadow-sm);
    }

    [data-theme="industrial"] .theme-btn.active {
      color: #000;
    }

    /* =====================================================================
       MAIN CONTENT — split layout
       ===================================================================== */

    .pos-shell {
      display: flex;
      flex-direction: column;
      flex: 1;
      overflow: hidden;
    }

    .pos-main {
      display: flex;
      flex: 1;
      overflow: hidden;
      gap: 0;
    }

    /* =====================================================================
       LEFT PANEL — Product Browser (60%)
       ===================================================================== */

    .panel-products {
      display: flex;
      flex-direction: column;
      width: 60%;
      min-width: 0;
      border-right: 1px solid var(--color-border);
      background-color: var(--color-bg-base);
      overflow: hidden;
    }

    [data-theme="modern"] .panel-products {
      background-color: transparent;
    }

    /* Search bar row */
    .search-row {
      display: flex;
      align-items: center;
      gap: var(--space-3);
      padding: var(--space-4) var(--space-5);
      background-color: var(--color-surface-1);
      border-bottom: 1px solid var(--color-border);
      flex-shrink: 0;
    }

    .search-wrap {
      position: relative;
      flex: 1;
    }

    .search-icon {
      position: absolute;
      left: var(--space-4);
      top: 50%;
      transform: translateY(-50%);
      color: var(--color-text-muted);
      pointer-events: none;
    }

    .search-input {
      width: 100%;
      height: 48px;
      padding: 0 var(--space-4) 0 44px;
      background-color: var(--color-bg-overlay);
      border: 1.5px solid var(--color-border);
      border-radius: var(--radius-md);
      font-family: var(--font-body);
      font-size: var(--text-body-lg);
      font-weight: var(--font-weight-regular);
      color: var(--color-text-primary);
      outline: none;
      transition: var(--transition-fast);
    }

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

    .search-input:focus {
      border-color: var(--color-border-focus);
      box-shadow: var(--shadow-focus);
      background-color: var(--color-bg-overlay);
    }

    [data-theme="modern"] .search-input {
      border-radius: var(--radius-lg);
      background-color: #fff;
    }

    .btn-scan {
      width: 48px;
      height: 48px;
      display: flex;
      align-items: center;
      justify-content: center;
      background-color: var(--btn-secondary-bg);
      border: 1.5px solid var(--btn-secondary-border);
      border-radius: var(--radius-md);
      color: var(--color-primary);
      cursor: pointer;
      transition: var(--transition-fast);
      flex-shrink: 0;
    }

    .btn-scan:hover {
      background-color: var(--btn-secondary-bg-hover);
      box-shadow: var(--shadow-accent);
    }

    [data-theme="industrial"] .btn-scan {
      clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
    }

    [data-theme="modern"] .btn-scan {
      border-radius: var(--radius-lg);
    }

    /* Quick category buttons */
    .categories-row {
      display: flex;
      align-items: center;
      gap: var(--space-2);
      padding: var(--space-3) var(--space-5);
      border-bottom: 1px solid var(--color-border);
      overflow-x: auto;
      flex-shrink: 0;
      scrollbar-width: none;
    }

    .categories-row::-webkit-scrollbar { display: none; }

    .category-label {
      font-size: var(--text-caption);
      font-weight: var(--font-weight-semibold);
      letter-spacing: var(--tracking-wider);
      text-transform: uppercase;
      color: var(--color-text-muted);
      white-space: nowrap;
      margin-right: var(--space-1);
    }

    .cat-btn {
      display: flex;
      align-items: center;
      gap: var(--space-2);
      padding: var(--space-2) var(--space-4);
      border: 1.5px solid var(--color-border);
      border-radius: var(--radius-sm);
      background-color: transparent;
      font-family: var(--font-body);
      font-size: var(--text-body-sm);
      font-weight: var(--font-weight-semibold);
      color: var(--color-text-secondary);
      cursor: pointer;
      white-space: nowrap;
      transition: var(--transition-fast);
      letter-spacing: var(--tracking-snug);
    }

    .cat-btn:hover {
      border-color: var(--color-primary);
      color: var(--color-primary);
      background-color: var(--color-primary-muted);
    }

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

    [data-theme="industrial"] .cat-btn.active { color: #000; }

    [data-theme="modern"] .cat-btn {
      border-radius: var(--radius-full);
    }

    [data-theme="industrial"] .cat-btn {
      clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 6px, 100% 100%, 0 100%);
    }

    /* Product grid */
    .product-grid-wrap {
      flex: 1;
      overflow-y: auto;
      padding: var(--space-4) var(--space-5);
      scrollbar-width: thin;
      scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
    }

    .product-grid-wrap::-webkit-scrollbar { width: 6px; }
    .product-grid-wrap::-webkit-scrollbar-track { background: var(--scrollbar-track); }
    .product-grid-wrap::-webkit-scrollbar-thumb {
      background-color: var(--scrollbar-thumb);
      border-radius: var(--radius-full);
    }
    .product-grid-wrap::-webkit-scrollbar-thumb:hover {
      background-color: var(--scrollbar-thumb-hover);
    }

    .product-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: var(--space-3);
    }

    @media (max-width: 1100px) {
      .product-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    /* Product card */
    .product-card {
      position: relative;
      display: flex;
      flex-direction: column;
      padding: var(--space-4);
      background-color: var(--color-surface-1);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      cursor: pointer;
      transition: var(--transition-fast);
      overflow: hidden;
    }

    .product-card:hover {
      border-color: var(--color-primary);
      box-shadow: var(--shadow-md);
      transform: translateY(-1px);
    }

    .product-card:hover .product-card__add {
      opacity: 1;
      transform: scale(1);
    }

    [data-theme="industrial"] .product-card {
      clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
      background-color: var(--color-surface-1);
      border-color: #2a2a2a;
    }

    [data-theme="industrial"] .product-card:hover {
      border-color: var(--color-primary);
      box-shadow: 0 0 0 1px var(--color-primary), var(--shadow-md);
    }

    [data-theme="modern"] .product-card {
      border-radius: var(--radius-lg);
      background-color: #fff;
      box-shadow: var(--shadow-sm);
    }

    [data-theme="modern"] .product-card:hover {
      box-shadow: var(--shadow-lg);
    }

    .product-card__category {
      font-size: var(--text-caption);
      font-weight: var(--font-weight-semibold);
      letter-spacing: var(--tracking-widest);
      text-transform: uppercase;
      color: var(--color-primary);
      margin-bottom: var(--space-1);
    }

    .product-card__name {
      font-family: var(--font-heading);
      font-size: var(--text-body);
      font-weight: var(--heading-weight-primary);
      line-height: var(--leading-h5);
      color: var(--color-text-primary);
      margin-bottom: var(--space-1);
      letter-spacing: var(--heading-tracking-h5);
    }

    [data-theme="industrial"] .product-card__name {
      font-size: 1.05rem;
      letter-spacing: 0.01em;
    }

    .product-card__oem {
      font-family: var(--font-mono);
      font-size: var(--text-caption);
      color: var(--color-text-muted);
      margin-bottom: var(--space-3);
    }

    .product-card__footer {
      display: flex;
      align-items: flex-end;
      justify-content: space-between;
      margin-top: auto;
      gap: var(--space-2);
    }

    .product-card__price {
      font-family: var(--font-mono);
      font-size: 1.1rem;
      font-weight: var(--font-weight-bold);
      color: var(--color-text-primary);
      line-height: 1;
    }

    .product-card__stock {
      font-size: var(--text-caption);
      color: var(--color-text-muted);
      margin-top: 2px;
    }

    .product-card__stock.low { color: var(--color-warning); }
    .product-card__stock.out { color: var(--color-error); }

    .product-card__add {
      width: 32px;
      height: 32px;
      border: none;
      border-radius: var(--radius-sm);
      background-color: var(--color-primary);
      color: var(--color-text-inverse);
      font-size: 1.2rem;
      font-weight: var(--font-weight-bold);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      opacity: 0.75;
      transform: scale(0.95);
      transition: var(--transition-fast);
      flex-shrink: 0;
    }

    .product-card__add:hover {
      background-color: var(--color-primary-hover);
      opacity: 1;
      transform: scale(1.08) !important;
    }

    [data-theme="industrial"] .product-card__add { color: #000; }
    [data-theme="modern"] .product-card__add { border-radius: var(--radius-md); }

    /* Add flash animation */
    @keyframes card-flash {
      0%   { background-color: var(--color-primary-muted); }
      100% { background-color: transparent; }
    }

    .product-card.added {
      animation: card-flash 0.4s ease forwards;
    }

    /* =====================================================================
       RIGHT PANEL — Cart / Ticket (40%)
       ===================================================================== */

    .panel-cart {
      display: flex;
      flex-direction: column;
      width: 40%;
      min-width: 320px;
      background-color: var(--color-surface-1);
      overflow: hidden;
      position: relative;
    }

    [data-theme="modern"] .panel-cart {
      background-color: #fff;
      box-shadow: -4px 0 20px rgba(26, 26, 46, 0.06);
    }

    [data-theme="industrial"] .panel-cart {
      background-color: #141414;
      border-left: 1px solid #2a2a2a;
    }

    /* Cart header */
    .cart-header {
      padding: var(--space-4) var(--space-5);
      border-bottom: 1px solid var(--color-border);
      flex-shrink: 0;
      background-color: var(--color-surface-2);
    }

    [data-theme="industrial"] .cart-header {
      background-color: #1a1a1a;
      border-bottom-color: var(--color-primary-muted);
    }

    .cart-header__top {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: var(--space-3);
    }

    .cart-header__sale-id {
      font-family: var(--font-heading);
      font-size: var(--text-h5);
      font-weight: var(--heading-weight-primary);
      color: var(--color-text-primary);
      letter-spacing: var(--heading-tracking-h5);
      display: flex;
      align-items: center;
      gap: var(--space-2);
    }

    .cart-header__sale-id::before {
      content: '';
      display: block;
      width: 4px;
      height: 20px;
      background-color: var(--color-primary);
      border-radius: 2px;
      flex-shrink: 0;
    }

    [data-theme="industrial"] .cart-header__sale-id {
      font-size: 1.35rem;
      letter-spacing: 0.03em;
    }

    .cart-header__status {
      font-size: var(--text-caption);
      font-weight: var(--font-weight-semibold);
      letter-spacing: var(--tracking-wider);
      text-transform: uppercase;
      color: var(--color-success);
      background-color: rgba(34, 197, 94, 0.12);
      padding: 3px var(--space-3);
      border-radius: var(--radius-full);
      border: 1px solid rgba(34, 197, 94, 0.25);
    }

    /* Customer row */
    .customer-row {
      display: flex;
      align-items: center;
      gap: var(--space-3);
    }

    .customer-icon {
      width: 34px;
      height: 34px;
      border-radius: var(--radius-full);
      background-color: var(--color-primary-muted);
      border: 1.5px solid var(--color-primary);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--color-primary);
      flex-shrink: 0;
    }

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

    .customer-info__name {
      font-size: var(--text-body-sm);
      font-weight: var(--font-weight-semibold);
      color: var(--color-text-primary);
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .customer-info__label {
      font-size: var(--text-caption);
      color: var(--color-text-muted);
    }

    .btn-change-customer {
      padding: var(--space-1) var(--space-3);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-full);
      background: transparent;
      font-family: var(--font-body);
      font-size: var(--text-caption);
      font-weight: var(--font-weight-semibold);
      color: var(--color-text-muted);
      cursor: pointer;
      transition: var(--transition-fast);
      white-space: nowrap;
    }

    .btn-change-customer:hover {
      border-color: var(--color-primary);
      color: var(--color-primary);
    }

    /* Cart items list */
    .cart-items {
      flex: 1;
      overflow-y: auto;
      padding: var(--space-3) var(--space-4);
      scrollbar-width: thin;
      scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
    }

    .cart-items::-webkit-scrollbar { width: 4px; }
    .cart-items::-webkit-scrollbar-track { background: transparent; }
    .cart-items::-webkit-scrollbar-thumb {
      background-color: var(--scrollbar-thumb);
      border-radius: var(--radius-full);
    }

    .cart-empty {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      height: 120px;
      color: var(--color-text-muted);
      font-size: var(--text-body-sm);
      gap: var(--space-2);
      opacity: 0.6;
    }

    .cart-item {
      display: flex;
      align-items: center;
      gap: var(--space-3);
      padding: var(--space-3) var(--space-2);
      border-bottom: 1px solid var(--color-border);
      transition: var(--transition-fast);
      animation: item-slide-in 0.2s ease;
    }

    @keyframes item-slide-in {
      from { opacity: 0; transform: translateX(10px); }
      to   { opacity: 1; transform: translateX(0); }
    }

    .cart-item:hover {
      background-color: var(--color-primary-muted);
      border-radius: var(--radius-sm);
    }

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

    .cart-item__qty-ctrl {
      display: flex;
      align-items: center;
      gap: var(--space-1);
      flex-shrink: 0;
    }

    .qty-btn {
      width: 26px;
      height: 26px;
      border: 1px solid var(--color-border-strong);
      border-radius: var(--radius-sm);
      background-color: var(--color-surface-3);
      color: var(--color-text-primary);
      font-size: 0.9rem;
      font-weight: var(--font-weight-bold);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition-fast);
      line-height: 1;
    }

    .qty-btn:hover {
      border-color: var(--color-primary);
      background-color: var(--color-primary);
      color: var(--color-text-inverse);
    }

    [data-theme="industrial"] .qty-btn:hover { color: #000; }

    .qty-display {
      font-family: var(--font-mono);
      font-size: var(--text-body-sm);
      font-weight: var(--font-weight-bold);
      color: var(--color-text-primary);
      min-width: 24px;
      text-align: center;
    }

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

    .cart-item__name {
      font-size: var(--text-body-sm);
      font-weight: var(--font-weight-semibold);
      color: var(--color-text-primary);
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .cart-item__unit {
      font-family: var(--font-mono);
      font-size: var(--text-caption);
      color: var(--color-text-muted);
    }

    .cart-item__total {
      font-family: var(--font-mono);
      font-size: var(--text-body-sm);
      font-weight: var(--font-weight-bold);
      color: var(--color-text-primary);
      text-align: right;
      min-width: 72px;
    }

    .cart-item__remove {
      width: 24px;
      height: 24px;
      border: none;
      border-radius: var(--radius-sm);
      background: transparent;
      color: var(--color-text-muted);
      font-size: 1rem;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition-fast);
      flex-shrink: 0;
      line-height: 1;
    }

    .cart-item__remove:hover {
      background-color: rgba(239, 68, 68, 0.15);
      color: var(--color-error);
    }

    /* Cart footer (totals + payment) */
    .cart-footer {
      flex-shrink: 0;
      border-top: 1px solid var(--color-border);
      background-color: var(--color-surface-2);
    }

    [data-theme="industrial"] .cart-footer {
      background-color: #1a1a1a;
      border-top-color: var(--color-primary-muted);
    }

    .totals-block {
      padding: var(--space-3) var(--space-5) var(--space-2);
    }

    .totals-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: var(--space-1) 0;
    }

    .totals-row__label {
      font-size: var(--text-body-sm);
      color: var(--color-text-muted);
    }

    .totals-row__value {
      font-family: var(--font-mono);
      font-size: var(--text-body-sm);
      color: var(--color-text-secondary);
    }

    .totals-row--total {
      margin-top: var(--space-2);
      padding-top: var(--space-2);
      border-top: 1px solid var(--color-border);
    }

    .totals-row--total .totals-row__label {
      font-family: var(--font-heading);
      font-size: var(--text-body-lg);
      font-weight: var(--heading-weight-primary);
      color: var(--color-text-primary);
      letter-spacing: var(--tracking-wide);
      text-transform: uppercase;
    }

    .totals-row--total .totals-row__value {
      font-family: var(--font-mono);
      font-size: 1.5rem;
      font-weight: var(--font-weight-bold);
      color: var(--color-primary);
    }

    /* Discount row */
    .discount-row {
      display: flex;
      align-items: center;
      gap: var(--space-3);
      padding: 0 var(--space-5) var(--space-3);
    }

    .discount-label {
      font-size: var(--text-caption);
      font-weight: var(--font-weight-semibold);
      color: var(--color-text-muted);
      text-transform: uppercase;
      letter-spacing: var(--tracking-wider);
      white-space: nowrap;
    }

    .discount-input {
      flex: 1;
      height: 30px;
      padding: 0 var(--space-3);
      background-color: var(--color-bg-base);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      font-family: var(--font-mono);
      font-size: var(--text-body-sm);
      color: var(--color-text-primary);
      outline: none;
      transition: var(--transition-fast);
    }

    .discount-input:focus {
      border-color: var(--color-border-focus);
      box-shadow: var(--shadow-focus);
    }

    [data-theme="modern"] .discount-input {
      border-radius: var(--radius-md);
    }

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

    /* Payment method buttons */
    .payment-methods {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: var(--space-2);
      padding: 0 var(--space-5) var(--space-3);
    }

    .pay-btn {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 3px;
      padding: var(--space-2) var(--space-2);
      border: 1.5px solid var(--color-border);
      border-radius: var(--radius-sm);
      background: transparent;
      font-family: var(--font-body);
      font-size: var(--text-caption);
      font-weight: var(--font-weight-semibold);
      letter-spacing: var(--tracking-wide);
      text-transform: uppercase;
      color: var(--color-text-muted);
      cursor: pointer;
      transition: var(--transition-fast);
    }

    .pay-btn:hover {
      border-color: var(--color-primary);
      color: var(--color-primary);
      background-color: var(--color-primary-muted);
    }

    .pay-btn.selected {
      border-color: var(--color-primary);
      background-color: var(--color-primary-muted);
      color: var(--color-primary);
      box-shadow: var(--shadow-accent);
    }

    .pay-btn__icon {
      font-size: 1.1rem;
    }

    [data-theme="modern"] .pay-btn {
      border-radius: var(--radius-md);
    }

    [data-theme="industrial"] .pay-btn {
      clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 6px, 100% 100%, 0 100%);
    }

    /* Main CTA button */
    .btn-cobrar {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: var(--space-3);
      width: calc(100% - var(--space-10));
      margin: 0 var(--space-5) var(--space-3);
      height: 56px;
      background-color: var(--btn-primary-bg);
      border: none;
      border-radius: var(--radius-md);
      font-family: var(--font-heading);
      font-size: 1.2rem;
      font-weight: var(--heading-weight-primary);
      letter-spacing: var(--tracking-widest);
      text-transform: uppercase;
      color: var(--btn-primary-text);
      cursor: pointer;
      transition: var(--transition-fast);
      box-shadow: var(--shadow-md);
    }

    .btn-cobrar:hover {
      background-color: var(--btn-primary-bg-hover);
      transform: translateY(-1px);
      box-shadow: var(--shadow-lg);
    }

    .btn-cobrar:active {
      background-color: var(--btn-primary-bg-active);
      transform: translateY(0);
    }

    .btn-cobrar:disabled {
      opacity: 0.4;
      cursor: not-allowed;
      transform: none;
    }

    [data-theme="industrial"] .btn-cobrar {
      clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
    }

    [data-theme="modern"] .btn-cobrar {
      border-radius: var(--radius-lg);
    }

    /* Secondary actions row */
    .secondary-actions {
      display: flex;
      gap: var(--space-2);
      padding: 0 var(--space-5) var(--space-4);
    }

    .btn-secondary-action {
      flex: 1;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: var(--space-1);
      height: 34px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      background: transparent;
      font-family: var(--font-body);
      font-size: var(--text-caption);
      font-weight: var(--font-weight-semibold);
      letter-spacing: var(--tracking-wide);
      text-transform: uppercase;
      color: var(--color-text-muted);
      cursor: pointer;
      transition: var(--transition-fast);
    }

    .btn-secondary-action:hover {
      border-color: var(--color-border-strong);
      color: var(--color-text-secondary);
      background-color: var(--color-surface-3);
    }

    .btn-secondary-action.danger:hover {
      border-color: var(--color-error);
      color: var(--color-error);
      background-color: rgba(239, 68, 68, 0.08);
    }

    [data-theme="modern"] .btn-secondary-action {
      border-radius: var(--radius-md);
    }

    /* =====================================================================
       NUMPAD OVERLAY
       ===================================================================== */

    .numpad-overlay {
      position: fixed;
      inset: 0;
      background-color: var(--overlay-backdrop);
      display: flex;
      align-items: flex-end;
      justify-content: center;
      z-index: var(--z-modal);
      opacity: 0;
      pointer-events: none;
      transition: opacity var(--duration-normal) var(--ease-in-out);
    }

    .numpad-overlay.visible {
      opacity: 1;
      pointer-events: all;
    }

    .numpad-panel {
      width: 360px;
      background-color: var(--color-surface-2);
      border: 1px solid var(--color-border-strong);
      border-bottom: none;
      border-radius: var(--radius-lg) var(--radius-lg) 0 0;
      padding: var(--space-5);
      transform: translateY(100%);
      transition: transform var(--duration-normal) var(--ease-out);
    }

    .numpad-overlay.visible .numpad-panel {
      transform: translateY(0);
    }

    [data-theme="industrial"] .numpad-panel {
      border-radius: var(--radius-sm) var(--radius-sm) 0 0;
      background-color: #1e1e1e;
      border-color: var(--color-primary-muted);
    }

    .numpad-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: var(--space-4);
    }

    .numpad-title {
      font-family: var(--font-heading);
      font-size: var(--text-h6);
      font-weight: var(--heading-weight-primary);
      text-transform: uppercase;
      letter-spacing: var(--tracking-widest);
      color: var(--color-text-primary);
    }

    .numpad-close {
      width: 28px;
      height: 28px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-full);
      background: transparent;
      color: var(--color-text-muted);
      font-size: 1rem;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition-fast);
    }

    .numpad-close:hover {
      border-color: var(--color-error);
      color: var(--color-error);
    }

    .numpad-display {
      background-color: var(--color-bg-base);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      padding: var(--space-3) var(--space-4);
      font-family: var(--font-mono);
      font-size: 1.8rem;
      font-weight: var(--font-weight-bold);
      color: var(--color-primary);
      text-align: right;
      margin-bottom: var(--space-4);
      min-height: 60px;
      display: flex;
      align-items: center;
      justify-content: flex-end;
      letter-spacing: var(--tracking-wide);
    }

    .numpad-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: var(--space-2);
    }

    .numpad-key {
      height: 52px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      background-color: var(--color-surface-3);
      font-family: var(--font-mono);
      font-size: 1.1rem;
      font-weight: var(--font-weight-semibold);
      color: var(--color-text-primary);
      cursor: pointer;
      transition: var(--transition-fast);
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .numpad-key:hover {
      background-color: var(--color-primary-muted);
      border-color: var(--color-primary);
      color: var(--color-primary);
    }

    .numpad-key:active {
      transform: scale(0.95);
    }

    .numpad-key.key-0 { grid-column: span 2; }

    .numpad-key.key-clear {
      background-color: rgba(239, 68, 68, 0.1);
      border-color: rgba(239, 68, 68, 0.3);
      color: var(--color-error);
    }

    .numpad-key.key-enter {
      background-color: var(--color-primary);
      border-color: var(--color-primary);
      color: var(--color-text-inverse);
      font-family: var(--font-heading);
      font-size: 0.85rem;
      letter-spacing: var(--tracking-wider);
      text-transform: uppercase;
    }

    [data-theme="industrial"] .numpad-key.key-enter { color: #000; }

    .numpad-key.key-enter:hover {
      background-color: var(--color-primary-hover);
    }

    [data-theme="modern"] .numpad-key {
      border-radius: var(--radius-md);
    }

    /* =====================================================================
       TOAST NOTIFICATION
       ===================================================================== */

    .toast-container {
      position: fixed;
      bottom: var(--space-6);
      left: 50%;
      transform: translateX(-50%);
      z-index: var(--z-toast);
      display: flex;
      flex-direction: column;
      gap: var(--space-2);
      pointer-events: none;
    }

    .toast {
      padding: var(--space-3) var(--space-5);
      background-color: var(--color-surface-3);
      border: 1px solid var(--color-border);
      border-left: 3px solid var(--color-primary);
      border-radius: var(--radius-md);
      font-size: var(--text-body-sm);
      font-weight: var(--font-weight-semibold);
      color: var(--color-text-primary);
      box-shadow: var(--shadow-lg);
      white-space: nowrap;
      animation: toast-in 0.25s ease, toast-out 0.3s ease 1.7s forwards;
    }

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

    @keyframes toast-out {
      from { opacity: 1; transform: translateY(0); }
      to   { opacity: 0; transform: translateY(-6px); }
    }

    /* =====================================================================
       RESPONSIVE — tablet/small desktop
       ===================================================================== */

    @media (max-width: 900px) {
      .pos-main {
        flex-direction: column;
      }

      .panel-products,
      .panel-cart {
        width: 100%;
        min-width: 0;
      }

      .panel-products {
        border-right: none;
        border-bottom: 1px solid var(--color-border);
        max-height: 55%;
      }

      .panel-cart {
        max-height: 45%;
      }

      .product-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .status-bar__center { display: none; }
    }

    @media (max-width: 600px) {
      .product-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .payment-methods {
        grid-template-columns: repeat(3, 1fr);
      }

      .status-bar { padding: 0 var(--space-3); }
      .search-row { padding: var(--space-3); }
      .categories-row { padding: var(--space-2) var(--space-3); }
    }

    /* =====================================================================
       UTILITY
       ===================================================================== */

    .sr-only {
      position: absolute;
      width: 1px;
      height: 1px;
      padding: 0;
      margin: -1px;
      overflow: hidden;
      clip: rect(0, 0, 0, 0);
      border: 0;
    }