/* BMW M Design System Tokens */
:root {
    --canvas: #000000;
    --surface-card: #1a1a1a;
    --surface-elevated: #262626;
    --surface-soft: #0d0d0d;
    --hairline: #3c3c3c;
    --primary: #ffffff;
    --on-dark: #ffffff;
    --body: #bbbbbb;
    
    /* M Tricolor */
    --m-blue-light: #0066b1;
    --m-blue-dark: #1c69d4;
    --m-red: #e22718;

    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 40px;
    --spacing-section: 96px;

    /* Border Radius (Strictly 0 for most elements) */
    --rounded-none: 0px;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--canvas);
    color: var(--primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* Typography Base */
h1, h2, h3 {
    font-weight: 700;
    text-transform: uppercase;
    color: var(--on-dark);
}

p {
    font-weight: 300;
    color: var(--body);
}

/* M Tricolor Stripe Divider */
.m-stripe-divider {
    display: flex;
    height: 4px;
    width: 100%;
}

.m-blue-light { background-color: var(--m-blue-light); flex: 1; }
.m-blue-dark { background-color: var(--m-blue-dark); flex: 1; }
.m-red { background-color: var(--m-red); flex: 1; }

.m-stripe-mini {
    display: inline-flex;
    height: 14px;
    width: 20px;
    margin-right: 12px;
}

/* Top Navigation */
.top-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
    padding: 0 var(--spacing-xl);
    background-color: var(--canvas);
    border-bottom: 1px solid var(--hairline);
}

.nav-logo {
    display: flex;
    align-items: center;
    font-weight: 700;
    font-size: 20px;
    letter-spacing: 1.5px;
}

.nav-links a {
    color: var(--on-dark);
    text-decoration: none;
    font-size: 14px;
    font-weight: 400;
    letter-spacing: 0.5px;
    margin-left: var(--spacing-lg);
}

/* Container & Layout */
.container {
    width: 100%;
    max-width: 1440px;
    margin: 0 auto;
    padding: var(--spacing-section) var(--spacing-xl);
    flex: 1;
}

.layout-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: start;
}

@media (max-width: 768px) {
    .layout-grid {
        grid-template-columns: 1fr;
    }
}

/* Cards & Surfaces */
.surface-card {
    background-color: var(--surface-card);
    padding: var(--spacing-lg);
    border-radius: var(--rounded-none);
}

/* Header */
.header {
    margin-bottom: var(--spacing-xl);
}

.header h1 {
    font-size: 40px;
    line-height: 1.1;
    margin-bottom: 12px;
}

.header p {
    font-size: 20px;
    line-height: 1.4;
}

/* Category Tabs (Mode Toggle) */
.category-tabs {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--hairline);
}

.category-tabs input[type="radio"] {
    display: none;
}

.category-tab {
    padding: 12px 0;
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 1.5px;
    color: var(--body);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: color 0.2s, border-color 0.2s;
}

.category-tabs input[type="radio"]:checked + .category-tab {
    color: var(--on-dark);
    border-bottom: 2px solid var(--on-dark);
}

/* Form Inputs */
.input-group-row {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.input-wrapper {
    position: relative;
    width: 100%;
    margin-bottom: var(--spacing-md);
}

.input-wrapper input,
.input-wrapper select {
    width: 100%;
    padding: 12px 16px;
    height: 48px;
    background-color: var(--surface-card);
    color: var(--on-dark);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-none);
    font-family: inherit;
    font-size: 16px;
    font-weight: 300; /* Light weight for inputs */
    outline: none;
    appearance: none;
    transition: border-color 0.2s;
}

.input-wrapper input::placeholder {
    color: var(--body);
}

.input-wrapper input:focus,
.input-wrapper select:focus {
    border-color: var(--on-dark);
}

.select-wrapper select {
    cursor: pointer;
}

.select-icon {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    color: var(--on-dark);
}

/* Buttons */
.button-primary {
    width: 100%;
    height: 48px;
    background-color: var(--canvas);
    color: var(--on-dark);
    border: 1px solid var(--on-dark);
    border-radius: var(--rounded-none);
    font-family: inherit;
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 1.5px;
    cursor: pointer;
    text-transform: uppercase;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background-color 0.2s, color 0.2s;
}

.button-primary:hover {
    background-color: var(--on-dark);
    color: var(--canvas);
}

.button-primary-outline {
    width: 100%;
    height: 48px;
    background-color: transparent;
    color: var(--on-dark);
    border: 1px solid var(--on-dark);
    border-radius: var(--rounded-none);
    font-family: inherit;
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 1.5px;
    cursor: pointer;
    text-transform: uppercase;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: var(--spacing-md);
    transition: background-color 0.2s, color 0.2s;
}

.button-primary-outline:hover {
    background-color: var(--on-dark);
    color: var(--canvas);
}

/* Preview Area */
.panel-right h2 {
    font-size: 24px;
    margin-bottom: var(--spacing-lg);
}

.preview-container {
    background-color: var(--surface-card);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-none);
    min-height: 350px;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-xl);
}

.preview-placeholder {
    color: var(--body);
    font-weight: 300;
    font-size: 14px;
    letter-spacing: 1.5px;
}

.preview-image {
    max-width: 100%;
    max-height: 400px;
    background-color: #ffffff; /* Must be white for barcode scanability */
    padding: var(--spacing-md);
}

/* Status Messages */
.status-container {
    margin-top: var(--spacing-lg);
}

.status-message {
    padding: var(--spacing-md);
    font-size: 14px;
    font-weight: 300;
    margin-bottom: var(--spacing-md);
    border-left: 4px solid;
}

.status-success {
    background-color: var(--surface-elevated);
    border-left-color: #0fa336;
}

.status-error {
    background-color: var(--surface-elevated);
    border-left-color: #f4b400;
}

/* Loader */
.loader {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.hidden {
    display: none !important;
}

/* Footer */
.footer {
    background-color: var(--canvas);
    padding: var(--spacing-xxl) var(--spacing-xl);
    border-top: 1px solid var(--hairline);
}

.footer p {
    font-size: 12px;
    letter-spacing: 0.5px;
}