:root {
    --bg-app: #f0f2f5;
    --bg-panel: #ffffff;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

    /* Paper Dimensions */
    --paper-width: 80mm;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-app);
    color: var(--text-main);
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100%;
}

/* Header */
.app-header {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 10;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--primary);
}

.logo-area h1 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-main);
}

/* Controls */
.control-group label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.segmented-control {
    background: var(--bg-app);
    padding: 4px;
    border-radius: 8px;
    display: flex;
    gap: 4px;
}

.segment {
    border: none;
    background: transparent;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s ease;
}

.segment:hover {
    color: var(--text-main);
}

.segment.active {
    background: var(--bg-panel);
    color: var(--primary);
    box-shadow: var(--shadow-sm);
}

/* Workspace - The "Desk" */
.editor-workspace {
    flex: 1;
    overflow-y: auto;
    display: flex;
    justify-content: center;
    padding: 3rem 1rem;
    background-image:
        linear-gradient(45deg, #e5e7eb 25%, transparent 25%),
        linear-gradient(-45deg, #e5e7eb 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #e5e7eb 75%),
        linear-gradient(-45deg, transparent 75%, #e5e7eb 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

.paper-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.paper-shadow {
    position: relative;
    box-shadow: var(--shadow-lg);
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.thermal-paper {
    width: var(--paper-width);
    min-height: 150mm;
    background: white;
    padding: 5mm;
    /* Safe margin simulating printer margin */
    font-family: 'JetBrains Mono', 'Courier New', monospace;
    /* Monospaced for receipt alignment */
    font-size: 14px;
    line-height: 1.4;
    color: black;
    outline: none;
    /* Simulate thermal paper look */
    border-top: 1px solid #f0f0f0;
}

/* Ruler underneath to show size context */
.paper-ruler {
    width: var(--paper-width);
    height: 20px;
    border-top: 1px solid var(--text-muted);
    display: flex;
    justify-content: space-between;
    font-size: 10px;
    color: var(--text-muted);
    position: relative;
    transition: width 0.3s ease;
}

.paper-ruler::before {
    content: '0mm';
}

.paper-ruler::after {
    content: attr(data-width);
}


/* Footer */
.app-footer {
    background: var(--bg-panel);
    border-top: 1px solid var(--border);
    padding: 1.5rem;
    display: flex;
    justify-content: center;
}

.print-button {
    background: var(--primary);
    color: white;
    border: none;
    padding: 0.75rem 2rem;
    border-radius: 99px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 4px 6px -1px rgba(37, 99, 235, 0.4);
    transition: transform 0.1s, box-shadow 0.1s;
}

.print-button:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 6px 8px -1px rgba(37, 99, 235, 0.5);
}

.print-button:active {
    transform: translateY(0);
}

/* PRINT STYLES - CRITICAL */
@media print {
    @page {
        margin: 0;
        size: auto;
        /* Allow printer driver to handle size or auto */
    }

    body * {
        visibility: hidden;
    }

    .thermal-paper,
    .thermal-paper * {
        visibility: visible;
    }

    .thermal-paper {
        position: fixed;
        left: 0;
        top: 0;
        width: 100%;
        /* Printer driver usually handles the exact width cutoff, but we set 100% of the printable area */
        max-width: var(--paper-width);
        /* Enforce the visual width constraint */
        margin: 0;
        padding: 0;
        box-shadow: none;
        overflow: visible;
    }

    /* Hide shadows and styling extras */
    .app-header,
    .app-footer {
        display: none;
    }

    .editor-workspace {
        background: none;
        padding: 0;
        margin: 0;
        /* Do NOT hide this, acts as parent */
    }

    .paper-shadow {
        box-shadow: none;
    }

    .paper-ruler {
        display: none;
    }

    /* Force black text for pasted content */
    .thermal-paper {
        color: black !important;
        text-shadow: none !important;
    }
}