/* Variables for colors and fonts */
:root {
    --bg-color: #f4f6f9;
    --panel-bg: #ffffff;
    --text-primary: #333333;
    --text-secondary: #666666;
    --border-color: #e0e0e0;
    --primary-color: #0056b3;
    --primary-hover: #004494;
    --secondary-color: #6c757d;
    --secondary-hover: #5a6268;
    
    --receipt-bg: #ffffff;
    --receipt-text: #000000;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

/* App Container Layout */
.app-container {
    display: flex;
    flex-wrap: wrap;
    max-width: 1200px;
    margin: 20px auto;
    padding: 0 15px;
    gap: 20px;
}

/* Panels */
.panel {
    background-color: var(--panel-bg);
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    padding: 25px;
}

.form-panel {
    flex: 1;
    min-width: 300px;
}

.preview-panel {
    flex: 0 0 450px;
    display: flex;
    flex-direction: column;
}

@media (max-width: 800px) {
    .preview-panel {
        flex: 1;
    }
}

/* Form Styling */
.panel-header {
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
}

.form-section {
    margin-bottom: 25px;
}

.form-section h3 {
    font-size: 1.1rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.form-group {
    margin-bottom: 15px;
    display: flex;
    flex-direction: column;
}

.form-row {
    display: flex;
    gap: 15px;
}

.form-row .form-group {
    flex: 1;
}

label {
    font-weight: 500;
    margin-bottom: 5px;
    font-size: 0.9rem;
}

input, select {
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.2s;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    margin-top: 20px;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}

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

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

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

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

/* Preview Panel Specific */
.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.paper-size-selector {
    display: flex;
    gap: 10px;
    font-size: 0.9rem;
}

.receipt-wrapper {
    background-color: #f0f0f0;
    padding: 20px;
    display: flex;
    justify-content: center;
    border-radius: 4px;
    overflow-y: auto;
    flex-grow: 1;
}

/* --- Receipt / Thermal Print Styling --- */
.receipt {
    background-color: var(--receipt-bg);
    color: var(--receipt-text);
    font-family: 'Roboto Mono', 'Courier New', Courier, monospace;
    padding: 10px;
    box-shadow: 0 0 5px rgba(0,0,0,0.2);
    /* Improve text crispness on screens */
    -webkit-font-smoothing: none;
}

/* Paper Sizes for Preview */
.paper-58mm {
    width: 220px; /* ~58mm */
    font-size: 11px;
    line-height: 1.2;
}

.paper-80mm {
    width: 300px; /* ~80mm */
    font-size: 13px;
    line-height: 1.3;
}

/* Struk Elements */
.header {
    text-align: center;
    margin-bottom: 10px;
}

.logo {
    display: flex;
    justify-content: center;
    margin-bottom: 5px;
}

.bold {
    font-weight: bold;
}

.text-lg {
    font-size: 1.3em;
}

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

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

.w-full {
    width: 100%;
}

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

.mb-1 {
    margin-bottom: 5px;
}

.divider {
    border-top: 1px dashed var(--receipt-text);
    margin: 5px 0;
}

.data-row {
    display: flex;
}

.data-row .label {
    flex: 0 0 50%;
}

.data-row .colon {
    flex: 0 0 10px;
}

.data-row .value {
    flex: 1;
}

/* --- Print Media Query --- */
@media print {
    /* Hide UI elements */
    body * {
        visibility: hidden;
    }
    
    .no-print {
        display: none !important;
    }

    /* Show only receipt */
    #receipt, #receipt * {
        visibility: visible;
    }
    
    body {
        margin: 0;
        padding: 0;
        background-color: transparent;
    }

    #receipt {
        position: absolute;
        left: 0;
        top: 0;
        margin: 0;
        padding: 0;
        box-shadow: none;
        width: 100%; /* Let printer driver determine physical width */
    }

    @page {
        margin: 0;
    }
}