/* --- MODERN UI/UX FOR INVENTORY DASHBOARD --- */

/* 1. Global Variables & Reset */
:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --secondary-color: #10b981;
    --secondary-hover: #059669;
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --warning-color: #f59e0b;
    --warning-hover: #d97706;
    
    --bg-main: #f3f4f6;
    --bg-sidebar: #1f2937;
    --bg-card: #ffffff;
    
    --text-dark: #111827;
    --text-light: #6b7280;
    --text-white: #f9fafb;
    
    --border-color: #e5e7eb;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --border-radius: 0.75rem;
    --font-family: 'Inter', sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-main);
    color: var(--text-dark);
}

/* 2. Main Layout & Sidebar */
.page-container {
    display: flex;
}

.sidebar {
    width: 260px;
    background-color: var(--bg-sidebar);
    color: var(--text-white);
    padding: 1.5rem;
    height: 100vh;
    position: fixed;
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2.5rem;
}

.sidebar-logo {
    font-size: 2rem;
    color: var(--primary-color);
}

.sidebar-title {
    font-size: 1.5rem;
    font-weight: 700;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    text-decoration: none;
    color: var(--text-white);
    font-weight: 500;
    transition: background-color 0.2s ease;
}

.nav-link:hover, .nav-link.active {
    background-color: rgba(79, 70, 229, 0.5);
}

.nav-link i {
    width: 20px;
    text-align: center;
}

.main-content {
    margin-left: 260px;
    padding: 2rem;
    width: calc(100% - 260px);
}

/* 3. Header & Search */
.main-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.main-header h2 {
    font-size: 1.75rem;
    font-weight: 600;
}

.search-container {
    position: relative;
}

.search-container i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
}

#search-sku {
    width: 300px;
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: box-shadow 0.2s, border-color 0.2s;
}

#search-sku:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

/* 4. Cards & Forms */
.content-section {
    margin-bottom: 2rem;
}

.card {
    background-color: var(--bg-card);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.card-description {
    color: var(--text-light);
    margin-bottom: 1rem;
}

.forms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

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

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.form-group input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
}

/* 5. Buttons */
.btn {
    width: 100%;
    padding: 0.75rem 1rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary { background-color: var(--primary-color); color: white; }
.btn-primary:hover { background-color: var(--primary-hover); }
.btn-success { background-color: var(--secondary-color); color: white; }
.btn-success:hover { background-color: var(--secondary-hover); }
.btn-danger { background-color: var(--danger-color); color: white; }
.btn-danger:hover { background-color: var(--danger-hover); }
.btn-warning { background-color: var(--warning-color); color: white; }
.btn-warning:hover { background-color: var(--warning-hover); }

/* 6. Table & Sort Buttons */
.table-container {
    overflow-x: auto;
}

#inventory-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

#inventory-table th, #inventory-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

#inventory-table thead {
    background-color: var(--bg-main);
}

#inventory-table th {
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.875rem;
    color: var(--text-light);
}

#inventory-table tbody tr:hover {
    background-color: #f9fafb;
}

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

.sort-btn {
    padding: 0.5rem 1rem;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s ease;
}
.sort-btn:hover { background-color: var(--bg-main); }
.sort-btn.active { background-color: var(--primary-color); color: white; border-color: var(--primary-color); }

/* 7. Barcode & File Input */
.barcode-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1rem;
}
.barcode-item {
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    text-align: center;
}
.barcode-item svg { width: 100%; height: auto; }
.barcode-item span { margin-top: 0.5rem; font-size: 0.875rem; word-break: break-all; }

.file-input { width: 100%; }
.sample-file-link { margin-top: 1rem; text-align: center; }
.sample-file-link a { color: var(--primary-color); text-decoration: none; font-weight: 500; }
.sample-file-link a:hover { text-decoration: underline; }

/* 8. Print Styles */
@media print {
    body * { visibility: hidden; }
    #barcode-container, #barcode-container * { visibility: visible; }
    #barcode-container { position: absolute; left: 0; top: 0; width: 100%; }
    .barcode-item { border: 1px solid #000; page-break-inside: avoid; }
}

/* 9. Responsive Design */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
        position: absolute;
        z-index: 10;
        /* Functionality would require JS, for now we hide it for simplicity */
        display: none;
    }
    .main-content {
        margin-left: 0;
        width: 100%;
        padding: 1rem;
    }
    .main-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    #search-sku {
        width: 100%;
    }
}