:root {
  --color-primary: #0f172a;
  --color-primary-hover: #1e293b;
  --color-accent: #3b82f6;
  --color-accent-hover: #2563eb;
  --color-danger: #ef4444;
  --color-bg: #f1f5f9; /* Slate 100 */
  --color-surface: #ffffff;
  --color-text: #334155;
  --color-text-light: #64748b;
  --color-border: #e2e8f0;

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -1px rgb(0 0 0 / 0.06);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -2px rgb(0 0 0 / 0.05);

  --max-width-paper: 384px;
  --spacing-unit: 8px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 24px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 0 16px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  z-index: 20;
}

header h1 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-controls {
  display: flex;
  gap: 8px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 16px;
  border-radius: 9999px; /* Pill shape */
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.2s;
}

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

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

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

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

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Main Canvas Area */
main {
  flex: 1;
  overflow-y: auto;
  padding: 24px 16px 80px 16px; /* Bottom padding for FAB */
  display: flex;
  flex-direction: column;
  align-items: center;
}

#paper-roll {
  background-color: white;
  width: 100%;
  max-width: var(--max-width-paper);
  min-height: 400px;
  box-shadow: var(--shadow-md);
  border-radius: var(--radius-md);
  padding-bottom: 80px; /* Space for FAB */
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: visible; /* Ensure rounded corners clip content */
}

/* Paper perforation effect at top */
#paper-roll::before {
  content: '';
  display: block;
  height: 4px;
  background: radial-gradient(circle, transparent 2px, #f1f5f9 3px);
  background-size: 8px 8px;
  opacity: 0.5;
}

/* Empty State */
.empty-state {
  padding: 32px;
  text-align: center;
  color: var(--color-text-light);
  font-style: italic;
}

/* Blocks */
.block-wrapper {
  position: relative;
  border: 1px dashed transparent;
  transition: border-color 0.2s;
  padding: 4px; /* Selection padding */
  border-radius: var(--radius-sm);
  margin: 4px;
}

.block-wrapper:hover {
  border-color: var(--color-accent);
  background-color: rgba(59, 130, 246, 0.02);
}

/* Block Header (Controls) */
.block-header {
    position: absolute;
    top: 50%;
    left: -40px; /* Move outside to the left */
    transform: translateY(-50%);
    display: flex;
    flex-direction: column; /* Stack vertically */
    gap: 4px;
    padding: 0;
    background: transparent;
    border: none;
    width: 32px; /* Fixed width for gutter */
    z-index: 10;
}

.block-title {
    display: none; /* Hide title to save space, icon is enough context? Or show on hover? */
}

.block-header-controls {
    display: flex;
    flex-direction: column;
    gap: 4px;
    align-items: center;
}

.header-btn {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 1px solid var(--color-border);
    background: white;
    color: var(--color-text-light);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    transition: all 0.2s;
    box-shadow: var(--shadow-sm);
}

.header-btn:hover {
    background-color: var(--color-bg);
    color: var(--color-text);
    transform: scale(1.1);
}

.header-btn.btn-delete:hover {
    background-color: #fee2e2;
    color: var(--color-danger);
    border-color: #fca5a5;
}

/* Move Drag Handle to header as well */
.drag-handle {
    cursor: grab;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    color: var(--color-text-light);
    font-size: 1.2rem;
    box-shadow: var(--shadow-sm);
}

.drag-handle:active {
    cursor: grabbing;
}


/* Specific Block Styles */

/* Text Block */
.text-block-editor .ql-container.ql-snow {
  border: none !important;
  font-family: inherit;
  font-size: 16px;
}
.text-block-editor .ql-editor {
    padding: 8px 12px;
    min-height: 60px;
}
/* Hide toolbar until block focus/hover? No, keep standard Quill behavior but style it minimal */
.text-block-editor .ql-toolbar.ql-snow {
    border: none;
    border-bottom: 1px solid #f1f5f9;
    padding: 4px;
    background: #f8fafc;
    opacity: 0.5;
    transition: opacity 0.2s;
}
.block-wrapper:hover .ql-toolbar.ql-snow {
    opacity: 1;
}

/* Quill Font Size Labels Fix */
.ql-snow .ql-picker.ql-size .ql-picker-label::before,
.ql-snow .ql-picker.ql-size .ql-picker-item::before { content: 'Normal'; }
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="10px"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="10px"]::before { content: '10px'; }
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="12px"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="12px"]::before { content: '12px'; }
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="14px"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="14px"]::before { content: '14px'; }
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="16px"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="16px"]::before { content: '16px'; }
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="18px"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="18px"]::before { content: '18px'; }
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="20px"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="20px"]::before { content: '20px'; }
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="24px"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="24px"]::before { content: '24px'; }
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="28px"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="28px"]::before { content: '28px'; }
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="32px"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="32px"]::before { content: '32px'; }
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="36px"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="36px"]::before { content: '36px'; }
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="48px"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="48px"]::before { content: '48px'; }
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="64px"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="64px"]::before { content: '64px'; }
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="72px"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="72px"]::before { content: '72px'; }
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="96px"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="96px"]::before { content: '96px'; }
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="128px"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="128px"]::before { content: '128px'; }
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="160px"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="160px"]::before { content: '160px'; }


/* Image Block */
.image-drop-zone {
    border: 2px dashed var(--color-border);
    border-radius: 8px;
    padding: 32px;
    text-align: center;
    color: var(--color-text-light);
    cursor: pointer;
    margin: 8px;
    transition: all 0.2s;
}
.image-drop-zone:hover, .image-drop-zone.drag-over {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background-color: #eff6ff;
}
.image-preview-canvas {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
    image-rendering: pixelated; /* Crucial for thermal preview */
}
.image-settings-panel {
    padding: 8px;
    background: #f8fafc;
    border-top: 1px solid var(--color-border);
    display: flex;
    gap: 8px;
    align-items: center;
    font-size: 0.8rem;
    justify-content: center;
}

/* Desktop: Move settings outside */
@media (min-width: 1024px) {
    .image-settings-panel {
        position: absolute;
        top: 0;
        left: 100%;
        width: 240px;
        margin-left: 16px;
        background: white;
        border: 1px solid var(--color-border);
        border-radius: var(--radius-sm);
        box-shadow: var(--shadow-md);
        flex-direction: column;
        align-items: flex-start;
        padding: 12px;
        z-index: 50;
    }
}

.setting-group select, .setting-group input {
    font-size: 0.8rem;
    padding: 2px 4px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
}

/* QR Block */
.qr-input-container {
    padding: 8px;
    border-bottom: 1px solid #f1f5f9;
}
.qr-input {
    width: 100%;
    padding: 6px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 0.9rem;
}
.qr-preview {
    padding: 16px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 200px;
}
.qr-preview img {
    max-width: 100%;
}


/* In-Flow Add Block Controls */
.add-block-container {
    display: flex;
    gap: 8px;
    padding: 16px;
    justify-content: center;
    border-top: 2px dashed var(--color-border);
    margin-top: 16px;
    background: #f8fafc;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.add-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 8px 12px;
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    min-width: 60px;
    box-shadow: var(--shadow-sm);
}

.add-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.add-btn .icon {
    font-size: 1.2rem;
    margin-bottom: 4px;
    display: block;
}

/* Printing active state */
.block-wrapper.printing-active {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

/* Battery Indicator */
.battery-indicator {
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 4px 8px;
    background: var(--color-bg);
    border-radius: 4px;
    color: var(--color-text);
}

/* Settings Modal (Simplified as a hidden panel for now?) */
/* No, let's make a settings popover in header */
.settings-popover {
    position: absolute;
    top: 60px;
    right: 16px;
    background: white;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    padding: 16px;
    border-radius: 8px;
    width: 250px;
    display: none;
    z-index: 300; /* Above Log Drawer (200) */
}
.settings-popover.active {
    display: block;
}
.settings-row {
    margin-bottom: 12px;
}
.settings-row label {
    display: block;
    font-size: 0.8rem;
    margin-bottom: 4px;
    color: var(--color-text-light);
}
.settings-row input {
    width: 100%;
}