:root {
    /* Light Mode (Default) */
    --bg-color: #f8f9fa;
    --panel-bg: #ffffff;
    --text-color: #212529;
    --muted-text: #6c757d;
    --border-color: #dee2e6;
    --accent-color: #007bff;
    --input-bg: #ffffff;
    --input-border: #ced4da;
    --tab-inactive: #e9ecef;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #121212;
        --panel-bg: #1e1e1e;
        --text-color: #e0e0e0;
        --muted-text: #a0a0a0;
        --border-color: #333333;
        --accent-color: #378efe;
        --input-bg: #2d2d2d;
        --input-border: #444444;
        --tab-inactive: #2d2d2d;
        --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    }
}

* {
    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-color);
    line-height: 1.5;
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: flex;
    height: 100vh;
}

/* === LEFT PANEL (Visuals) === */
.left-panel {
    width: 45vw;
    background-color: var(--bg-color);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    padding: 2rem;
    box-shadow: var(--shadow);
    z-index: 10;
}

header h1 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 2rem;
    color: var(--text-color);
}

.canvas-wrapper {
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    background-color: var(--bg-color); /* Contrast against panel */
    align-self: center;
    margin-bottom: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
}

canvas {
    max-width: 100%;
    max-height: 350px; /* Constrain visual height */
    width: auto;       /* Maintain aspect ratio */
    height: auto;      /* Maintain aspect ratio */
    image-rendering: pixelated;
}

.actions {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
}

.primary-btn {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 0.8rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.1s, opacity 0.2s;
}

.primary-btn:hover {
    opacity: 0.9;
}

.primary-btn:active {
    transform: scale(0.98);
}

/* Visual Settings Grouping */
.visual-settings {
    margin-top: auto; /* Push to bottom if space allows */
}

.settings-group {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
}

.settings-group h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--muted-text);
    margin-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.25rem;
}

.compact-row {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.compact-row .field {
    margin-bottom: 0;
    flex: 1;
}

.compact-row label {
    font-size: 0.7rem;
    margin-bottom: 0.1rem;
}

.compact-row input, .compact-row select {
    padding: 0.3rem;
    font-size: 0.85rem;
}

/* Compact Label Controls */
.label-compact {
    margin-bottom: 0.75rem;
}

.label-text-input {
    width: 100%;
    margin-bottom: 0.25rem;
    font-weight: 500;
    border: 1px solid var(--input-border);
    background: var(--input-bg);
    color: var(--text-color);
    padding: 0.4rem;
    border-radius: 4px;
}

.label-controls {
    display: flex;
    gap: 0.25rem;
}

.label-controls input[type="color"] {
    width: 30px;
    height: 30px;
    padding: 0;
    border: none;
    background: none;
    cursor: pointer;
}

.label-controls select, .label-controls input[type="text"] {
    flex: 1;
    padding: 0.2rem 0.4rem;
    font-size: 0.8rem;
    border: 1px solid var(--input-border);
    border-radius: 4px;
    background: var(--input-bg);
    color: var(--text-color);
}

/* === RIGHT PANEL (Data) === */
.right-panel {
    flex: 1;
    background-color: var(--panel-bg);
    display: flex;
    flex-direction: column;
    padding: 2rem;
    overflow-y: auto;
}

.tabs {
    display: flex;
    gap: 2px;
    background-color: var(--border-color);
    padding: 2px;
    border-radius: 8px;
    margin-bottom: 1.5rem;
}

.tab-btn {
    flex: 1;
    border: none;
    padding: 0.5rem;
    background: var(--tab-inactive);
    color: var(--text-color);
    cursor: pointer;
    font-size: 0.875rem;
    border-radius: 6px;
    transition: all 0.2s;
}

.tab-btn.active {
    background: var(--panel-bg);
    font-weight: 600;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.tab-pane {
    display: none;
    background: var(--panel-bg);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.tab-pane.active {
    display: block;
}

/* Form Fields */
.field {
    margin-bottom: 1rem;
}

.field-row > .field {
    margin-bottom: 0;
}

.field label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.35rem;
    color: var(--text-color);
}

.field input[type="text"],
.field input[type="password"],
.field input[type="url"],
.field input[type="email"],
.field input[type="tel"],
.field input[type="date"],
.field input[type="number"],
.name-field-wrapper input[type="text"],
.field select,
.field textarea {
    width: 100%;
    padding: 0.6rem 0.8rem;
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 6px;
    color: var(--text-color);
    font-family: inherit;
    font-size: 0.95rem;
}

.field-row {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.field-row.compact-gap {
    gap: 0.5rem;
}

.field-row .field {
    min-width: 0; /* Prevent flex overflow */
}

/* Square Color Input */
.square-color-input {
    width: 40px !important;
    height: 40px !important;
    padding: 2px !important;
    border: 1px solid var(--input-border) !important;
    background: var(--input-bg) !important;
    cursor: pointer;
    border-radius: 4px;
}

.checkbox-field {
    display: flex;
    align-items: center;
    justify-content: flex-start; /* Left align */
    padding-top: 1.8rem; /* Align with inputs */
}

/* Scanner */
.scanner-upload-zone {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 3rem 1rem;
    text-align: center;
    cursor: pointer;
    background-color: var(--bg-color);
}

.scanner-result textarea {
    background-color: var(--bg-color);
    font-family: monospace;
}

.secondary-btn {
    width: 100%;
    padding: 0.6rem;
    background: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    margin-top: 0.5rem;
}

.app-footer {
    margin-top: auto;
    font-size: 0.75rem;
    color: var(--muted-text);
    text-align: center;
    padding-top: clamp(0.5rem, 3vh, 2rem);
    padding-bottom: 0.5rem;
}

/* === Collapsible Groups (vCard) === */
.vcard-group {
    margin-bottom: 1rem;
}

.group-header {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-color);
    cursor: pointer;
    padding: 0;
    user-select: none;
    transition: all 0.2s;
    display: inline-block;
}

.group-header:hover {
    opacity: 0.8;
}

.vcard-group.collapsed {
    margin-bottom: 0.25rem;
}

.vcard-group.collapsed .group-header {
    color: var(--muted-text);
    font-style: italic;
    font-size: 0.75rem;
    padding: 0;
}

.vcard-group.collapsed .group-header::before {
    content: '+ ';
}

/* Remove Icon */
.group-header::after {
    display: none;
}

.group-content {
    transition: opacity 0.2s;
    margin-top: 0.25rem;
}

.vcard-group.collapsed .group-content {
    display: none;
}

/* === Name Row Special Logic === */
.name-row-container {
    display: flex;
    gap: 0.5rem;
    position: relative;
    align-items: center;
    padding-top: 2rem; /* Buffer zone for buttons */
    margin-top: -1.5rem; /* Pull back up so layout looks same */
}

.name-field-wrapper {
    flex: 1;
    position: relative;
    transition: flex 0.2s;
}

.name-field-wrapper.hidden {
    display: none;
}

/* Adjust flex basis when items are shown to balance layout */
#wrap-prefix { flex: 0.5; }
#wrap-suffix { flex: 0.5; }
#wrap-mn { flex: 0.8; }
#wrap-fn, #wrap-ln { flex: 1.2; }

/* Name UI Overlay (For Add Buttons) */
.name-adder-btn {
    position: absolute;
    top: 0; /* Inside the padding area */
    padding: 2px 6px;
    background-color: var(--accent-color);
    color: white;
    font-size: 0.65rem;
    border-radius: 4px;
    cursor: pointer;
    z-index: 20;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    white-space: nowrap;
    opacity: 0;
    transform: translateY(5px);
    transition: opacity 0.2s, transform 0.2s;
    pointer-events: none; /* Ignored until active class added */
}

.name-adder-btn.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.name-divider-line {
    position: absolute;
    top: 2rem; /* Start below the padding/button area */
    bottom: 0;
    width: 2px;
    background-color: var(--accent-color);
    z-index: 19;
    opacity: 0;
    transition: opacity 0.2s;
    pointer-events: none;
}

.name-divider-line.visible {
    opacity: 0.5;
}

/* Mobile Responsive */
@media (max-width: 900px) {
    .app-container {
        flex-direction: column;
        overflow-y: auto;
    }

    .left-panel, .right-panel {
        width: 100%;
        border-right: none;
        overflow: visible;
        flex: none;
    }

    .left-panel {
        order: 1;
        border-bottom: 1px solid var(--border-color);
    }
    
    .right-panel {
        order: 2;
    }
    
    body {
        overflow: auto;
    }
}