:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --secondary: #64748b;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --background: #f1f5f9;
    --surface: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --radius: 0.5rem;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --font-lao: 'Noto Sans Lao', sans-serif;
}

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+Lao:wght@100..900&display=swap');

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

body {
    font-family: var(--font-lao);
    background-color: var(--background);
    color: var(--text);
    line-height: 1.5;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Layout */
.app-container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

.sidebar {
    width: 250px;
    background-color: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 1rem;
    transition: transform 0.3s ease;
}

.main-content {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
}

/* Components */
.card {
    background-color: var(--surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    font-family: var(--font-lao);
    gap: 0.5rem;
}

.btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

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

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

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

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

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

.btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
}

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

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

.form-control {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-family: var(--font-lao);
}

.form-control:focus {
    outline: 2px solid var(--primary);
    border-color: transparent;
}

/* Tables */
.table-container {
    overflow-x: auto;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.table th {
    background-color: var(--background);
    font-weight: 600;
}

/* Utilities */
.d-flex {
    display: flex;
}

.justify-between {
    justify-content: space-between;
}

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

.gap-2 {
    gap: 0.5rem;
}

.gap-4 {
    gap: 1rem;
}

.mt-4 {
    margin-top: 1rem;
}

.mb-2 {
    margin-bottom: 0.5rem;
}

.mb-4 {
    margin-bottom: 1rem;
}

.p-2 {
    padding: 0.5rem;
}

.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.text-primary {
    color: var(--primary);
}

.text-danger {
    color: var(--danger);
}

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

.w-full {
    width: 100%;
}

.border-bottom {
    border-bottom: 1px solid var(--border);
}

.grid {
    display: grid;
    gap: 1rem;
}

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

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

.grid-cols-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* Login Page */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background-color: var(--background);
}

.login-card {
    width: 100%;
    max-width: 400px;
}

/* POS Specific */
.pos-layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 1rem;
    height: calc(100vh - 4rem);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1rem;
    overflow-y: auto;
    padding-right: 0.5rem;
}

.product-card {
    cursor: pointer;
    transition: transform 0.2s;
    border: 1px solid var(--border);
}

.product-card:hover {
    transform: translateY(-2px);
    border-color: var(--primary);
}

.product-image {
    width: 100%;
    height: 120px;
    object-fit: cover;
    border-radius: var(--radius) var(--radius) 0 0;
    background-color: #eee;
}

.cart-panel {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.cart-items {
    flex: 1;
    overflow-y: auto;
    border-bottom: 1px solid var(--border);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--surface);
    padding: 2rem;
    border-radius: var(--radius);
    width: 100%;
    max-width: 500px;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background-color: var(--text);
    color: white;
    padding: 1rem 2rem;
    border-radius: var(--radius);
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
}

.toast.show {
    opacity: 1;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -250px;
        height: 100%;
        z-index: 100;
        box-shadow: 2px 0 5px rgba(0, 0, 0, 0.1);
    }

    .sidebar.active {
        left: 0;
    }

    .pos-layout {
        grid-template-columns: 1fr;
        display: flex;
        flex-direction: column;
        height: calc(100vh - 5rem);
    }

    .product-grid {
        flex: 1;
        overflow-y: auto;
        padding-bottom: 1rem;
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }

    .product-image {
        height: 100px;
    }

    .cart-panel {
        height: auto;
        max-height: 40vh;
        border-top: 2px solid var(--border);
        position: relative;
        z-index: 10;
        box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    }

    .cart-items {
        max-height: 150px;
    }
}

#reader video {
    object-fit: cover;
    border-radius: var(--radius);
}