:root {
    --primary-color: #4CAF50;
    --secondary-color: #f1f1f1;
    --dark-color: #333;
    --light-color: #fff;
    --border-radius: 8px;
    --box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

body {
    font-family: 'Roboto', sans-serif;
    background-color: #f8f9fa;
    color: var(--dark-color);
    margin: 0;
    line-height: 1.6;
}

header {
    background-color: var(--primary-color);
    color: var(--light-color);
    padding: 0.5rem 2rem;
    box-shadow: var(--box-shadow);
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.logo {
    height: 50px;
}

header h1 {
    margin: 0;
    font-size: 1.75rem;
}

.container {
    display: grid;
    grid-template-areas:
        "inventory inventory"
        "orders transfers"
        "logistics logistics";
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    padding: 2rem;
    max-width: 1600px;
    margin: 0 auto;
}

#inventory-panel { grid-area: inventory; }
#external-orders-panel { grid-area: orders; }
#internal-transfers-panel { grid-area: transfers; }
#logistics-panel { grid-area: logistics; }

.panel {
    background-color: var(--light-color);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    display: flex;
    flex-direction: column;
}

h2 {
    color: var(--primary-color);
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 0.5rem;
    margin-top: 0;
}

h3 {
    margin-bottom: 1rem;
}

form {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

input[type="text"], input[type="number"], select {
    padding: 0.75rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 1rem;
    background-color: var(--light-color);
}

button {
    background-color: var(--primary-color);
    color: var(--light-color);
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #45a049;
}

.clear-btn {
    background-color: #f44336;
    margin-top: auto;
}

.clear-btn:hover {
    background-color: #d32f2f;
}

.list-container {
    flex-grow: 1;
    overflow-y: auto;
    min-height: 200px;
}

#product-list, #external-orders-container, #internal-transfers-container, #supplier-list, #destination-list, #shopper-list, #receiver-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.product-item {
    display: grid;
    grid-template-columns: 1fr auto auto minmax(120px, 1fr) minmax(120px, 1fr) auto auto;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background-color: var(--secondary-color);
    border-radius: 4px;
}

.product-item-info {
    font-weight: 500;
}
.product-item-info small {
    display: block;
    color: #666;
    font-weight: 400;
}

.price-info {
    color: #0069d9;
    font-weight: 500 !important;
}

.product-item input[type="number"] {
    width: 70px;
    text-align: center;
}

.quantity-unit-selector {
    padding: 0.75rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 1rem;
    background-color: var(--light-color);
}

.add-to-list-btn {
    padding: 0.5rem 1rem;
    font-size: 1.2rem;
    font-weight: bold;
}

.add-to-list-btn-small {
    padding: 0.5rem;
    font-size: 0.8rem;
    font-weight: 500;
    min-width: 85px;
    text-align: center;
}

.shopping-list-group {
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    overflow: hidden;
    background-color: #fff;
}

.shopping-list-group h4 {
    background-color: var(--secondary-color);
    padding: 0.75rem 1rem;
    margin: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.shopper-selector {
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    border: 1px solid #ccc;
    font-size: 0.9rem;
    background-color: var(--light-color);
}

.list-group {
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    overflow: hidden;
    background-color: #fff;
}

.list-group-header {
    background-color: var(--secondary-color);
    padding: 0.75rem 1rem;
    margin: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.list-group-header-main {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.list-group-header-title {
    font-weight: bold;
    font-size: 1.1em;
}

.list-group-total {
    font-weight: 500;
    color: var(--primary-color);
    font-size: 1em;
}

.list-group-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.share-buttons {
    display: flex;
    gap: 0.5rem;
}

.share-btn {
    display: inline-block;
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    color: white;
    text-decoration: none;
    font-size: 0.8rem;
    font-weight: 500;
    border: none;
    cursor: pointer;
}

.share-btn.whatsapp { background-color: #25D366; }
.share-btn.whatsapp:hover { background-color: #128C7E; }
.share-btn.email { background-color: #777; }
.share-btn.email:hover { background-color: #555; }

.list-items-wrapper {
    padding: 0.5rem 0;
}

.destination-group {
    padding: 0.5rem 1rem 0.5rem 1rem;
    margin-top: 0.5rem;
}
.destination-group:first-child {
    margin-top: 0;
}

.destination-group-header {
    font-size: 1.1em;
    font-weight: 500;
    margin-bottom: 0.75rem;
    color: var(--primary-color);
    padding-left: 0.5rem;
    border-left: 3px solid var(--primary-color);
}

.destination-group-header small {
    font-weight: 400;
    color: #666;
    font-style: italic;
    margin-left: 0.5rem;
}

.list-item {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid #eee;
    margin-left: 1rem;
}
.list-item:last-child {
    border-bottom: none;
}

.list-item-details {
    flex-grow: 1;
}

.list-item-main {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.list-item-price-info {
    font-size: 0.9em;
    color: #555;
    text-align: right;
    white-space: nowrap;
}

.list-item small.destination-tag {
    color: #555;
    font-style: italic;
}

.remove-item-btn {
    background: none;
    border: none;
    color: #f44336;
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    padding: 0.25rem;
    margin-left: 1rem;
}

.logistics-columns {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.logistics-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background-color: var(--secondary-color);
    border-radius: 4px;
}

.logistics-item-info small {
    display: block;
    color: #666;
    font-size: 0.9em;
}

.delete-logistics-btn {
    background: none;
    border: none;
    color: #f44336;
    font-size: 1.4rem;
    line-height: 1;
    cursor: pointer;
    padding: 0 0.25rem;
}

@media (max-width: 1200px) {
    .container {
        grid-template-areas:
            "inventory inventory"
            "orders orders"
            "transfers transfers"
            "logistics logistics";
    }
}

@media (max-width: 992px) {
    .container {
        grid-template-columns: 1fr;
        grid-template-areas:
            "inventory"
            "orders"
            "transfers"
            "logistics";
    }
    .panel {
        min-height: 400px;
    }
    .logistics-columns {
        grid-template-columns: 1fr;
    }
}