/* ============================================
   GOOGLE FONTS IMPORT
   ============================================ */
@import url('https://fonts.googleapis.com/css2?family=Roboto+Mono:wght@400;500;600;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=VT323&display=swap');
/* ============================================
   CSS VARIABLES & RESET
   ============================================ */
:root {
    /* Colors */
    --color-primary: #667eea;
    --color-primary-dark: #764ba2;
    --color-success: #28a745;
    --color-warning: #ffc107;
    --color-danger: #dc3545;
    --color-info: #0082fc;
    
    /* Grays */
    --color-white: #ffffff;
    --color-gray-100: #f8f9fa;
    --color-gray-200: #e9ecef;
    --color-gray-300: #dee2e6;
    --color-gray-400: #ced4da;
    --color-gray-500: #adb5bd;
    --color-gray-600: #6c757d;
    --color-gray-700: #495057;
    --color-gray-800: #343a40;
    --color-gray-900: #212529;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 15px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.2);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    
    /* Fonts */
    --font-sans: 'Arial', 'Helvetica Neue', Helvetica, sans-serif; 
    /* CHANGED TO ROBOTO MONO */
    --font-mono: 'VT323', monospace; 
}

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

/* ============================================
   BASE STYLES
   ============================================ */
html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--color-gray-800);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    min-height: 100vh;
    padding: var(--spacing-lg);
}

/* ============================================
   LAYOUT
   ============================================ */
.container {
    max-width: 800px;
    margin: 0 auto;
}

/* ============================================
   HEADER & FOOTER
   ============================================ */
.page-header {
    text-align: center;
    color: var(--color-white);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg) 0;
}

.page-header h1 {
    font-size: clamp(1.75rem, 5vw, 2.5rem);
    margin-bottom: var(--spacing-sm);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    font-weight: 700;
}

.page-header p {
    opacity: 0.9;
    font-size: 1.1rem;
}

.page-footer {
    text-align: center;
    color: var(--color-white);
    opacity: 0.8;
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-xl);
}

/* ============================================
   PANELS
   ============================================ */
.panel {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
}

.panel h2 {
    color: var(--color-gray-800);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-primary);
    font-size: 1.25rem;
    font-weight: 700;
}

.panel--actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* ============================================
   FORMS
   ============================================ */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.form-row {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.form-row > * {
    flex: 1;
    min-width: 200px;
}

.form-row--item {
    align-items: flex-end;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-gray-700);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 500;
    background-color: var(--color-white);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group input::placeholder {
    color: var(--color-gray-500);
    font-weight: 400;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    line-height: 1.5;
}

.btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn:active:not(:disabled) {
    transform: translateY(0);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
}

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

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

.btn-test {
    background-color: var(--color-warning);
    color: var(--color-gray-900);
}

.btn-print {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    color: var(--color-white);
    font-size: 1.125rem;
    padding: var(--spacing-md) var(--spacing-xl);
    width: 100%;
    font-weight: 700;
}

.btn-clear {
    background-color: var(--color-danger);
    color: var(--color-white);
    width: 100%;
}

.btn-delete {
    background-color: var(--color-danger);
    color: var(--color-white);
    border: none;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 600;
    transition: opacity var(--transition-fast);
}

.btn-delete:hover {
    opacity: 0.8;
}

.btn-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

/* ============================================
   ITEMS LIST
   ============================================ */
.items-list {
    min-height: 100px;
}

.item-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--color-gray-100);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    border-left: 4px solid var(--color-primary);
    transition: background-color var(--transition-fast);
}

.item-row:hover {
    background-color: var(--color-gray-200);
}

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

.item-name {
    font-weight: 600;
    color: var(--color-gray-900);
    word-wrap: break-word;
}

.item-details {
    font-size: 0.875rem;
    color: var(--color-gray-600);
    margin-top: var(--spacing-xs);
    font-weight: 500;
}

.item-price {
    font-weight: 700;
    color: var(--color-primary);
    text-align: right;
    white-space: nowrap;
}

.item-actions {
    flex-shrink: 0;
}

.empty-state {
    text-align: center;
    color: var(--color-gray-500);
    padding: var(--spacing-xl);
    font-style: italic;
    font-weight: 500;
}

/* ============================================
   CALCULATIONS
   ============================================ */
.calculation-totals {
    margin-bottom: var(--spacing-md);
}

.calculation-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-gray-200);
    font-weight: 600;
}

.calculation-row--total {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    border-top: 2px solid var(--color-primary);
    border-bottom: none;
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-md);
}

/* ============================================
   CONNECTION STATUS
   ============================================ */
.connection-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: var(--color-gray-100);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.status-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    animation: pulse 2s infinite;
    flex-shrink: 0;
}

.status-dot--connected {
    background-color: var(--color-success);
}

.status-dot--disconnected {
    background-color: var(--color-danger);
}

.status-text {
    font-weight: 600;
    color: var(--color-gray-700);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ============================================
   ALERTS & MESSAGES
   ============================================ */
.alert {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    display: none;
    line-height: 1.6;
    border: 1px solid transparent;
    font-weight: 600;
}

.alert--error {
    display: block;
    background-color: #f8d7da;
    color: #721c24;
    border-color: #f5c6cb;
}

.alert--success {
    display: block;
    background-color: #d4edda;
    color: #155724;
    border-color: #c3e6cb;
}

/* ============================================
   RECEIPT PREVIEW - ROBOTO MONO
   ============================================ */
.dimension-info {
    background-color: #e3f2fd;
    border-left: 4px solid #2196f3;
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    color: #1565c0;
    font-weight: 600;
}

.dimension-info strong {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 700;
}

.receipt-preview {
    background-color: #ffffff;
    padding: 15px;
    border: 1px solid #dee2e6;
    
    /* BitArray-A2 Settings */
    font-family: var(--font-mono);
    
    /* Ukuran disesuaikan agar pas 32 karakter per baris */
    /* VT323/BitArray biasanya butuh size lebih besar dari Arial */
    font-size: 18px; 
    line-height: 1.1; /* Thermal printer lines are tight */
    
    white-space: pre-wrap;
    width: 384px; /* Lebar 58mm pada 203 DPI */
    max-width: 100%;
    margin: 0 auto;
    font-weight: normal;
    color: #444;
    
    /* Efek Pixelated agar terlihat tajam seperti printer */
    image-rendering: pixelated; 
    -webkit-font-smoothing: none;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

/* KHUSUS BOLD */
.receipt-preview b {
    font-weight: 530;
    color: #000; /* Hitam pekat */
}

/* Items List Styling */
.items-list { margin-bottom: 1rem; }
.item-row { 
    display: flex; justify-content: space-between; 
    padding: 0.5rem; border-bottom: 1px solid #eee; 
}

/* Style untuk Baris Pemisah di Daftar Item */
.item-row.is-separator {
    background-color: #f0f0f0;
    justify-content: center;
    font-weight: bold;
    text-transform: uppercase;
    color: #444;
    padding: 8px;
    border-bottom: 2px solid #ccc;
    margin-top: 10px;
}

/* ============================================
   PRINT MEDIA
   ============================================ */
@media print {
    body * {
        visibility: hidden;
    }
    
    .receipt-preview,
    .receipt-preview * {
        visibility: visible;
    }
    
    .receipt-preview {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        max-width: none;
        border: none;
        box-shadow: none;
        padding: 0;
        margin: 0;
        font-family: 'Roboto Mono', monospace; /* Force font in print */
        font-size: 12px;
    }
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 640px) {
    body {
        padding: var(--spacing-md);
    }
    
    .panel {
        padding: var(--spacing-md);
    }
    
    .form-row {
        flex-direction: column;
    }
    
    .form-row > * {
        min-width: 100%;
    }
    
    .btn-group {
        flex-direction: column;
    }
    
    .btn-group .btn {
        width: 100%;
    }
    
    .item-row {
        flex-wrap: wrap;
    }
    
    .item-price {
        width: 100%;
        text-align: left;
        margin-top: var(--spacing-xs);
    }
    
    /* Preview responsive */
    .receipt-preview {
        transform: scale(0.9);
        transform-origin: top center;
    }
}