:root {
    --bg-app: #f8fafc;
    --bg-sidebar: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --primary-color: #0f172a;
    --accent-color: #f59e0b;
    --border-color: #cbd5e1;
    --weekend-color: #f1f5f9;
    --holiday-color: #fca5a5;

    /* Calendar Vars */
    --cal-font: 'Outfit', sans-serif;
    --cal-header-font: 'Playfair Display', serif;
}

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

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

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

/* Sidebar */
.sidebar {
    width: 320px;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    z-index: 10;
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.02);
    overflow-y: auto;
    /* Allow scrolling */
    overflow-x: hidden;
    /* Prevent horizontal scroll */
    height: 100dvh;
    /* Dynamic viewport height for mobile browsers */
}

.brand h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.brand span {
    color: var(--primary-color);
}

.brand p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.control-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

input[type="number"],
input[type="text"] {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
}

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

.toggle-group button {
    flex: 1;
    border: none;
    background: none;
    padding: 6px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.toggle-group button.active {
    background: white;
    color: var(--primary-color);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.checkbox-group {
    display: flex;
    align-items: center;
}

.checkbox-group label {
    text-transform: none !important;
    font-weight: 400 !important;
    margin-left: 8px;
    cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.color-picker-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    /* Allow wrapping on small screens */
}

.color-control {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.color-control input {
    border: none;
    width: 40px;
    height: 40px;
    cursor: pointer;
    background: none;
}

.color-control input {
    border: none;
    width: 40px;
    height: 40px;
    cursor: pointer;
    background: none;
}

.style-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 5px;
}

.style-row input[type="range"] {
    flex: 1;
    margin-left: 10px;
}

.style-row select {
    flex: 1;
    margin-left: 10px;
    padding: 5px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.btn-primary,
.btn-secondary {
    padding: 0.75rem;
    border-radius: 8px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.1s;
}

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

.btn-secondary {
    background: transparent;
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    margin-top: 0.5rem;
}

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

/* Preview Area */
.preview-area {
    flex: 1;
    background: #eef2f6;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.toolbar {
    padding: 1rem;
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 1rem;
}

.canvas-wrapper {
    flex: 1;
    overflow: auto;
    display: flex;
    /* justify-content: center; REMOVED to fix overflow clipping */
    align-items: flex-start;
    padding: 2rem;
}

#zoomWrapper {
    margin: auto;
    /* safe centering: centers when smaller, aligns top-left when overflowing */
    transition: width 0.2s, height 0.2s;
    /* Prevents collapse during format switch if needed, but mainly holds space */
    position: relative;
}

/* Calendar Sheet Styling */
.calendar-sheet {
    background: white;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    transform-origin: top left;
    /* Pivot from top-left to avoid left overflow */
    transition: transform 0.2s;
    /* Dimensions for A4 at 96 DPI approx */
    /* A4: 210mm x 297mm -> Aspect Ratio ~0.707 */
    /* We work in landscape for linear usually? Or user image looks landscape. */
    /* Let's default to Landscape A4 */
    margin: 0;
    width: 1123px;
    /* A4 Landscape at ~96dpi */
    height: 794px;
    padding: 40px;
    display: flex;
    flex-direction: column;
}

.calendar-sheet.A3 {
    width: 1587px;
    height: 1123px;
}

.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 20px;
}

.calendar-header h2 {
    font-family: var(--cal-header-font);
    font-size: 2.5rem;
    border: 2px solid #333;
    padding: 10px 20px;
    border-radius: 12px;
}

.quote {
    font-family: 'Nothing You Could Do', cursive;
    /* Fallback if not loaded */
    font-style: italic;
    font-size: 1.2rem;
}

.calendar-grid {
    flex: 1;
    display: grid;
    /* 12 months + header row? Or just 12 rows. */
    /* Columns: Month Label + 31 days + End padding */
    grid-template-rows: repeat(13, minmax(0, 1fr));
    /* 1 header + 12 months */
    grid-template-columns: 100px repeat(37, 1fr) 50px;
    /* Month Name + Days + Month Number */
    border-top: 2px solid #000;
}

.calendar-grid.hide-month-nums {
    grid-template-columns: 100px repeat(37, 1fr);
}

.calendar-grid.hide-month-nums .month-number-label,
.calendar-grid.hide-month-nums .header-num-spacer {
    display: none;
}

/* Generated Grid Items */
.grid-header {
    font-weight: bold;
    text-align: center;
    padding: 5px;
    font-size: 0.8rem;
}

.month-label,
.month-number-label {
    font-weight: bold;
    display: flex;
    align-items: center;
    font-size: 1.1rem;
    text-transform: capitalize;
}

.month-label {
    justify-content: flex-end;
    padding-right: 15px;
}

.month-number-label {
    justify-content: flex-start;
    padding-left: 15px;
}

.day-cell {
    border: 1px solid rgba(0, 0, 0, 0.05);
    /* Full border */
    display: flex;
    /* Default Center */
    align-items: center;
    justify-content: center;
    /* Prevent text selection for better drag experience */
    user-select: none;

    font-size: var(--day-font-size);
    position: relative;
    font-weight: 500;
    padding: 2px;
    overflow: hidden;
    /* Prevent breaking */
}

/* Positioning Modifiers */
.calendar-grid[data-pos="top-left"] .day-cell {
    align-items: flex-start;
    justify-content: flex-start;
}

.calendar-grid[data-pos="top-center"] .day-cell {
    align-items: flex-start;
    justify-content: center;
}

.calendar-grid[data-pos="top-right"] .day-cell {
    align-items: flex-start;
    justify-content: flex-end;
}

.calendar-grid[data-pos="bottom-left"] .day-cell {
    align-items: flex-end;
    justify-content: flex-start;
}

.calendar-grid[data-pos="bottom-center"] .day-cell {
    align-items: flex-end;
    justify-content: center;
}

.calendar-grid[data-pos="bottom-right"] .day-cell {
    align-items: flex-end;
    justify-content: flex-end;
}

.calendar-grid[data-pos="center"] .day-cell {
    align-items: center;
    justify-content: center;
}

.day-cell.active-day {
    cursor: pointer;
}

.day-cell.active-day:hover {
    background-color: rgba(0, 0, 0, 0.02);
}

.weekend {
    background-color: var(--weekend-color, #f1f5f9);
}

.holiday {
    background-color: var(--holiday-color, #fca5a5) !important;
    color: #7f1d1d;
    font-weight: bold;
}

/* Hide empty cells option */
.calendar-grid.hide-empty .day-cell:empty {
    visibility: hidden;
    pointer-events: none;
}

.calendar-grid.hide-empty .day-cell:not(:empty) {
    border: 1px solid rgba(0, 0, 0, 0.05);
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        width: 85%;
        max-width: 320px;
        transform: translateX(-100%);
        transition: transform 0.3s ease-in-out;
        z-index: 1000;
        box-shadow: 0 0 50px rgba(0, 0, 0, 0.2);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    #mobileMenuBtn {
        display: block !important;
    }

    #closeSidebarBtn {
        display: block !important;
    }

    .canvas-wrapper {
        padding: 1rem;
        /* Less padding on mobile */
    }

    /* Overlay when sidebar is open */
    .sidebar.open::before {
        content: '';
        position: fixed;
        top: 0;
        left: 320px;
        /* Offset by sidebar width */
        right: -100vw;
        bottom: 0;
        background: rgba(0, 0, 0, 0.3);
        z-index: -1;
    }

    .sidebar .controls {
        padding-bottom: 50px;
        /* Extra space for mobile bottom nav */
    }
}