/* =========================================
   1. RESET & VARIABLES
   ========================================= */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&display=swap');

:root {
    /* Color Palette - Slate & Blue (Dark Mode Default) */
    --bg-color: #0F172A;
    /* Slate 900 */
    --surface-color: #1E293B;
    /* Slate 800 */
    --surface-hover: #334155;
    /* Slate 700 */
    --border-color: #334155;
    /* Slate 700 */
    --primary-color: #3B82F6;
    /* Blue 500 */
    --primary-hover: #2563EB;
    /* Blue 600 */
    --text-color: #F1F5F9;
    /* Slate 50 */
    --text-muted: #94A3B8;
    /* Slate 400 */
    --danger-color: #EF4444;
    /* Red 500 */
    --success-color: #10B981;
    /* Emerald 500 */

    /* Spacing & Layout */
    --border-radius: 12px;
    --container-max-width: 1200px;
    --header-height: 80px;

    /* A4 Dimensions (Keep exact) */
    --a4-width: 210mm;
    --a4-height: 296mm;
}

/* Light Mode Overrides (Optional Toggle support) */
body.light-mode {
    --bg-color: #F8FAFC;
    /* Slate 50 */
    --surface-color: #FFFFFF;
    /* White */
    --surface-hover: #F1F5F9;
    /* Slate 100 */
    --border-color: #E2E8F0;
    /* Slate 200 */
    --text-color: #0F172A;
    /* Slate 900 */
    --text-muted: #64748B;
    /* Slate 500 */
}

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

body {
    font-family: 'Outfit', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* =========================================
   2. CONTROL PANEL (Main UI)
   ========================================= */
#control-panel {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 2rem;
    flex: 1;
}

/* Header */
header {
    margin-bottom: 3rem;
    text-align: center;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 1rem;
}

header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
    letter-spacing: -0.02em;
}

.subtitle {
    color: var(--text-muted);
    font-size: 1rem;
    margin-top: 1rem;
}

/* Buttons */
.icon-btn {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    width: 40px;
    height: 40px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.icon-btn:hover {
    background: var(--surface-hover);
    border-color: var(--text-muted);
}

.primary-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all 0.2s;
    width: 100%;
}

.primary-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.secondary-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    border-radius: 8px;
    padding: 0.75rem 1.5rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all 0.2s;
    width: 100%;
}

.secondary-btn:hover {
    background: var(--surface-hover);
    border-color: var(--text-muted);
}

.secondary-sm-btn,
.danger-sm-btn {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    border: 1px solid transparent;
    transition: all 0.15s;
    flex: 1;
}

.secondary-sm-btn {
    background: var(--surface-hover);
    color: var(--text-color);
    border-color: var(--border-color);
}

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

.danger-sm-btn {
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger-color);
    border-color: rgba(239, 68, 68, 0.3);
}

.danger-sm-btn:hover {
    background: rgba(239, 68, 68, 0.25);
}

/* Grid Layout */
.controls-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    /* 3 Columns on Desktop */
    gap: 2rem;
    align-items: start;
}

/* Cards (Upload & Settings) */
.upload-section,
.settings-section {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    transition: transform 0.2s, box-shadow 0.2s;
}

.upload-section:hover,
.settings-section:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    border-color: var(--primary-color);
}

.section-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.section-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0;
}

.text-primary {
    color: var(--primary-color);
}

.text-muted {
    color: var(--text-muted);
}

/* Drop Zones */
.preview-box {
    width: 100%;
    aspect-ratio: 1.58;
    /* Common Card aspect ratio */
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    background: transparent;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    overflow: hidden;
    position: relative;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.preview-box:hover,
.preview-box.drag-over {
    border-color: var(--primary-color);
    background: rgba(59, 130, 246, 0.05);
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    color: var(--text-muted);
    text-align: center;
    font-size: 0.9rem;
    font-weight: 500;
    padding: 1rem;
}

.preview-box.has-image {
    border-style: solid;
    border-color: var(--primary-color);
}

.preview-box.has-image .empty-state {
    display: none;
}

/* Actions */
.actions {
    display: flex;
    gap: 0.75rem;
}

/* Settings Controls */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
}

.select-wrapper {
    position: relative;
}

select {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-color);
    font-family: inherit;
    font-size: 1rem;
    cursor: pointer;
    appearance: none;
    /* Custom arrow ideally, keeping simple for now */
}

select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.info-card {
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: 8px;
    padding: 1rem;
    display: flex;
    gap: 0.75rem;
    align-items: start;
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.4;
}

.main-actions {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

/* =========================================
   3. RESPONSIVE (Mobile First approach applied backwards)
   ========================================= */
@media (max-width: 1024px) {
    .controls-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .settings-section {
        grid-column: span 2;
    }
}

@media (max-width: 768px) {
    #control-panel {
        padding: 1rem;
    }

    header {
        margin-bottom: 2rem;
    }

    .header-content {
        flex-direction: row;
        gap: 1rem;
    }

    header h1 {
        font-size: 1.25rem;
    }

    .controls-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .settings-section {
        grid-column: span 1;
    }
}

/* =========================================
   4. ADVANCED EDITOR (Overlay) - Updated
   ========================================= */
.editor-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: var(--bg-color);
    color: var(--text-color);
    z-index: 1000;
    display: flex;
    flex-direction: column;
}

.editor-overlay.hidden {
    display: none;
}

.editor-header {
    height: 70px;
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 1.5rem;
    /* Safe area for mobile notches and nav bars */
    padding-top: env(safe-area-inset-top);
    padding-left: max(1.5rem, env(safe-area-inset-left));
    padding-right: max(1.5rem, env(safe-area-inset-right));
}

.editor-header h2 {
    font-size: 1.25rem;
    margin: 0;
    margin-left: 0.5rem;
}

.header-left,
.header-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.history-controls button {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    width: 36px;
    height: 36px;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.history-controls button:hover:not(:disabled) {
    background: var(--surface-hover);
    color: var(--text-color);
}

.history-controls button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.editor-layout {
    flex: 1;
    display: flex;
    overflow: hidden;
}

/* Editor Sidebar */
.editor-sidebar {
    width: 80px;
    background: var(--surface-color);
    border-right: 1px solid var(--border-color);
    padding-top: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    z-index: 10;
    /* Ensure sidebar stays above other content */
}

.tab-btn {
    width: 64px;
    height: 64px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    transition: 0.2s;
}

.tab-btn:hover:not(:disabled) {
    color: var(--text-color);
    background: var(--surface-hover);
}

.tab-btn.active {
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary-color);
}

.tab-btn.active svg {
    stroke: var(--primary-color);
}

.tab-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.tab-btn .label {
    font-size: 0.7rem;
    font-weight: 500;
}

/* Canvas */
.editor-canvas-wrapper {
    flex: 1;
    background: #0b101e;
    /* Darker than bg for contrast */
    background-image:
        radial-gradient(#334155 1px, transparent 1px);
    background-size: 20px 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: visible;
    /* Allow objects to show outside canvas bounds */
    /* Enable smooth touch gestures on mobile */
    touch-action: none;
    -webkit-user-select: none;
    user-select: none;
    position: relative;
    /* For floating button positioning */
}

/* Floating History Controls */
.floating-history-controls {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 12px;
    z-index: 100;
    pointer-events: none;
    /* Let clicks pass through container */
}

.floating-history-controls .floating-btn {
    pointer-events: all;
    /* But buttons are clickable */
    width: 48px;
    height: 48px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3),
        0 0 0 1px rgba(255, 255, 255, 0.1);
    transition: all 0.2s ease;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.floating-history-controls .floating-btn:hover:not(:disabled) {
    background: var(--surface-hover);
    transform: scale(1.05);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.4);
}

.floating-history-controls .floating-btn:active:not(:disabled) {
    transform: scale(0.95);
}

.floating-history-controls .floating-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.floating-history-controls .floating-btn svg {
    stroke: currentColor;
}

.canvas-container {
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    border: 1px solid var(--border-color);
    overflow: visible !important;
    position: relative;
    touch-action: none;
    /* Prevent default browser zoom */
}


/* Editor Panel (Right) */
.editor-panel {
    width: 300px;
    background: var(--surface-color);
    border-left: 1px solid var(--border-color);
    padding: 1.5rem;
    overflow-y: auto;
}

.panel-content {
    display: none;
    animation: fadeIn 0.3s;
}

.panel-content.active {
    display: block;
}

.panel-content h3 {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.control-group {
    margin-bottom: 1.5rem;
}

.control-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Range Sliders */
input[type="range"] {
    width: 100%;
    accent-color: var(--primary-color);
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    appearance: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid var(--bg-color);
}

/* Editor Inputs */
input[type="number"],
input[type="color"] {
    width: 100%;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.5rem;
    border-radius: 6px;
}

/* Editor Buttons */
.btn-row {
    display: flex;
    gap: 0.5rem;
}

.btn-row button {
    flex: 1;
    padding: 0.5rem;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    border-radius: 6px;
    cursor: pointer;
}

.btn-row button:hover {
    border-color: var(--text-muted);
}

.action-btn {
    width: 100%;
    padding: 0.75rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
}

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

.confirm-btn {
    width: 100%;
    padding: 0.6rem;
    background: var(--success-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    margin-bottom: 0.5rem;
}

.cancel-btn {
    width: 100%;
    padding: 0.6rem;
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

.danger-btn {
    width: 100%;
    padding: 0.6rem;
    border: 1px solid var(--danger-color);
    color: var(--danger-color);
    background: transparent;
    border-radius: 6px;
    cursor: pointer;
}

.danger-btn:hover {
    background: rgba(239, 68, 68, 0.1);
}

/* Filter Grid */
.filter-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.filter-btn {
    height: 60px;
    background: var(--bg-color);
    border: 2px solid transparent;
    color: var(--text-muted);
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
}

.filter-btn:hover {
    background: var(--surface-hover);
    color: var(--text-color);
}

/* Toggle Button States */
.toggle-btn {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-color);
    border: 2px solid var(--border-color);
    color: var(--text-color);
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.toggle-btn:hover {
    border-color: var(--text-muted);
}

.toggle-btn.active {
    background: rgba(59, 130, 246, 0.15);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* Hidden Utility */
.hidden {
    display: none !important;
}

/* Editor Mobile */
@media (max-width: 768px) {
    .editor-header {
        padding: 0.75rem 1rem;
        padding-top: max(0.75rem, env(safe-area-inset-top));
        padding-bottom: env(safe-area-inset-bottom);
        padding-left: max(1rem, env(safe-area-inset-left));
        padding-right: max(1rem, env(safe-area-inset-right));
        height: auto;
        min-height: 60px;
        flex-wrap: wrap;
        gap: 0.75rem;
    }

    .header-left {
        flex: 1;
        min-width: 0;
        gap: 0.5rem;
    }

    .editor-header h2 {
        font-size: 1rem;
        margin-left: 0.25rem;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .history-controls {
        display: flex;
        gap: 0.5rem;
    }

    .history-controls button {
        width: 32px;
        height: 32px;
        flex-shrink: 0;
    }

    .header-right {
        gap: 0.5rem;
        flex-shrink: 0;
    }

    .header-right .secondary-btn,
    .header-right .primary-btn {
        padding: 0.5rem 1rem;
        font-size: 0.875rem;
        width: auto;
        white-space: nowrap;
    }

    .editor-layout {
        flex-direction: column;
    }

    .editor-sidebar {
        width: 100%;
        height: auto;
        flex-direction: row;
        border-right: none;
        border-top: 1px solid var(--border-color);
        order: 3;
        padding: 0.5rem;
        padding-bottom: max(0.5rem, env(safe-area-inset-bottom));
        justify-content: space-around;
        z-index: 20;
        /* Higher z-index for mobile to stay above nav bars */
        position: relative;
        /* Ensure z-index takes effect */
        overflow-x: auto;
        overflow-y: hidden;
    }

    .tab-btn {
        width: 56px;
        height: 56px;
        flex-shrink: 0;
    }

    .tab-btn .label {
        font-size: 0.65rem;
    }

    .editor-panel {
        width: 100%;
        height: auto;
        max-height: 40vh;
        border-left: none;
        border-top: 1px solid var(--border-color);
        order: 2;
        padding: 1rem;
    }

    /* Make all control buttons more touch-friendly on mobile */
    .editor-panel .btn-row button {
        padding: 0.75rem;
        min-height: 44px;
        font-size: 0.9rem;
    }

    .editor-panel .action-btn,
    .editor-panel .confirm-btn,
    .editor-panel .cancel-btn,
    .editor-panel .danger-btn,
    .editor-panel .toggle-btn {
        padding: 0.75rem 1rem;
        min-height: 48px;
        font-size: 1rem;
    }

    .editor-panel input[type="range"] {
        height: 8px;
    }

    .editor-panel input[type="range"]::-webkit-slider-thumb {
        width: 24px;
        height: 24px;
    }

    .filter-grid {
        gap: 1rem;
    }

    .filter-btn {
        height: 72px;
        font-size: 0.95rem;
    }

    /* Position floating controls at bottom center on mobile */
    .floating-history-controls {
        top: auto;
        bottom: 20px;
        right: 50%;
        transform: translateX(50%);
        padding-bottom: env(safe-area-inset-bottom);
        gap: 16px;
    }

    .floating-history-controls .floating-btn {
        width: 56px;
        height: 56px;
    }

    .floating-history-controls .floating-btn svg {
        width: 24px;
        height: 24px;
    }

    .editor-canvas-wrapper {
        order: 1;
        min-height: 40vh;
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(5px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* =========================================
   5. PRINT STYLES (NO CHANGES TO LOGIC)
   ========================================= */
#print-area {
    display: none;
}

@media print {
    @page {
        size: A4 portrait;
        margin: 0;
    }

    body {
        background: white;
        margin: 0;
        padding: 0;
    }

    .no-print,
    #control-panel,
    .editor-overlay {
        display: none !important;
    }

    #print-area {
        display: block;
    }

    .page {
        width: var(--a4-width);
        height: var(--a4-height);
        page-break-after: always;
        position: relative;
        overflow: hidden;
        padding-top: 15mm;
        padding-left: 15mm;
        background: white;
    }

    .page:last-child {
        page-break-after: avoid;
    }

    .grid-container {
        display: grid;
        grid-template-columns: repeat(2, 85.6mm);
        grid-template-rows: repeat(4, 53.98mm);
        column-gap: 10mm;
        row-gap: 10mm;
    }

    .card-slot img {
        width: 100%;
        height: 100%;
        object-fit: fill;
        /* Stretch to fit as requested */
        display: block;
        border-radius: 3mm;
        /* Force printing of background images/colors if any (though here it's img tag) */
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }
}