/**
 * Spartaco Interactive Canvas - Frontend CSS
 * Design: Minimale, Elegante, Professionale
 */

/* ========================================
   VARIABILI CSS
   ======================================== */
:root {
    --canvas-primary: #667eea;
    --canvas-primary-dark: #5568d3;
    --canvas-secondary: #764ba2;
    --canvas-accent: #f093fb;

    --canvas-text: #2c3e50;
    --canvas-text-light: #6c757d;

    --canvas-bg: #ffffff;
    --canvas-bg-light: #f8f9fa;
    --canvas-bg-dark: #f1f3f5;

    --canvas-border: #e9ecef;

    --canvas-shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --canvas-shadow: 0 4px 16px rgba(0,0,0,0.12);
    --canvas-shadow-lg: 0 8px 32px rgba(0,0,0,0.16);

    --canvas-radius: 12px;
    --canvas-radius-sm: 8px;

    --canvas-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========================================
   CONTAINER PRINCIPALE
   ======================================== */
.spartaco-canvas-container {
    max-width: 100%;
    margin: 40px auto;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    animation: canvas-fade-in 0.4s ease-out;
}

@keyframes canvas-fade-in {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   TOOLBAR MINIMALE
   ======================================== */
.spartaco-canvas-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 20px;
    padding: 20px 24px;
    background: var(--canvas-bg);
    border-radius: var(--canvas-radius) var(--canvas-radius) 0 0;
    border: 1px solid var(--canvas-border);
    border-bottom: none;
    box-shadow: var(--canvas-shadow-sm);
}

.canvas-tool {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--canvas-text);
}

.canvas-tool label {
    margin: 0;
    font-weight: 500;
    white-space: nowrap;
    user-select: none;
}

/* ========================================
   COLOR PICKER ELEGANTE
   ======================================== */
.canvas-color-wrapper {
    position: relative;
}

.canvas-color-current {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background: var(--canvas-bg-light);
    border: 2px solid var(--canvas-border);
    border-radius: var(--canvas-radius-sm);
    cursor: pointer;
    transition: var(--canvas-transition);
}

.canvas-color-current:hover {
    border-color: var(--canvas-primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.canvas-color-preview {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    box-shadow: inset 0 0 0 1px rgba(0,0,0,0.1), var(--canvas-shadow-sm);
    transition: var(--canvas-transition);
}

.canvas-color-current:hover .canvas-color-preview {
    transform: scale(1.1);
}

.canvas-color-label {
    font-size: 13px;
    font-weight: 500;
    color: var(--canvas-text-light);
}

/* Color Palette Dropdown */
.canvas-color-palette {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    z-index: 1000;
    display: none;
    background: var(--canvas-bg);
    border: 1px solid var(--canvas-border);
    border-radius: var(--canvas-radius-sm);
    padding: 16px;
    box-shadow: var(--canvas-shadow-lg);
    min-width: 280px;
    animation: palette-slide-in 0.2s ease-out;
}

@keyframes palette-slide-in {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.canvas-color-palette.active {
    display: block;
}

.canvas-palette-section {
    margin-bottom: 16px;
}

.canvas-palette-section:last-child {
    margin-bottom: 0;
}

.canvas-palette-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--canvas-text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin: 0 0 10px 0;
}

.canvas-palette-colors {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 8px;
}

.canvas-palette-color {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--canvas-transition);
    box-shadow: inset 0 0 0 1px rgba(0,0,0,0.1);
    position: relative;
}

.canvas-palette-color:hover {
    transform: scale(1.15);
    box-shadow: inset 0 0 0 1px rgba(0,0,0,0.1), var(--canvas-shadow);
}

.canvas-palette-color.active {
    border-color: var(--canvas-primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

.canvas-palette-color.active::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 14px;
    font-weight: bold;
    text-shadow: 0 1px 2px rgba(0,0,0,0.3);
}

/* Custom Color Input */
.canvas-custom-color-input {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 8px;
}

.canvas-custom-color-input input[type="color"] {
    width: 60px;
    height: 36px;
    border: 2px solid var(--canvas-border);
    border-radius: 6px;
    cursor: pointer;
    background: none;
}

.canvas-custom-color-input input[type="text"] {
    flex: 1;
    padding: 8px 12px;
    font-size: 13px;
    font-family: 'Monaco', 'Courier New', monospace;
    border: 1px solid var(--canvas-border);
    border-radius: 6px;
    background: var(--canvas-bg-light);
}

/* ========================================
   BRUSH SIZE SLIDER
   ======================================== */
.canvas-brush-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 16px;
    background: var(--canvas-bg-light);
    border-radius: var(--canvas-radius-sm);
    min-width: 180px;
}

.canvas-brush-size {
    flex: 1;
    height: 4px;
    background: linear-gradient(to right, #e9ecef 0%, var(--canvas-primary) 100%);
    border-radius: 2px;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.canvas-brush-size::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--canvas-bg);
    border: 3px solid var(--canvas-primary);
    border-radius: 50%;
    cursor: grab;
    box-shadow: var(--canvas-shadow-sm);
    transition: var(--canvas-transition);
}

.canvas-brush-size::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: var(--canvas-shadow);
}

.canvas-brush-size::-webkit-slider-thumb:active {
    cursor: grabbing;
    transform: scale(1.1);
}

.canvas-brush-size::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--canvas-bg);
    border: 3px solid var(--canvas-primary);
    border-radius: 50%;
    cursor: grab;
    box-shadow: var(--canvas-shadow-sm);
    transition: var(--canvas-transition);
}

.canvas-brush-size::-moz-range-thumb:hover {
    transform: scale(1.2);
    box-shadow: var(--canvas-shadow);
}

.canvas-brush-size::-moz-range-thumb:active {
    cursor: grabbing;
    transform: scale(1.1);
}

.brush-size-value {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    padding: 4px 8px;
    background: var(--canvas-bg);
    border: 1px solid var(--canvas-border);
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    color: var(--canvas-primary);
}

/* ========================================
   TOOL BUTTONS
   ======================================== */
.canvas-tool-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 16px;
    background: var(--canvas-bg-light);
    border: 2px solid transparent;
    border-radius: var(--canvas-radius-sm);
    color: var(--canvas-text);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--canvas-transition);
    user-select: none;
}

.canvas-tool-btn:hover {
    background: var(--canvas-bg-dark);
    border-color: var(--canvas-border);
    transform: translateY(-1px);
    box-shadow: var(--canvas-shadow-sm);
}

.canvas-tool-btn:active {
    transform: translateY(0);
}

.canvas-tool-btn.active {
    background: linear-gradient(135deg, var(--canvas-primary), var(--canvas-secondary));
    color: white;
    border-color: transparent;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

.canvas-tool-btn.danger {
    color: #ef4444;
}

.canvas-tool-btn.danger:hover {
    background: rgba(239, 68, 68, 0.1);
    border-color: #ef4444;
}

.canvas-tool-btn.success {
    background: linear-gradient(135deg, #51cf66, #40c057);
    color: white;
    border-color: transparent;
}

.canvas-tool-btn.success:hover {
    box-shadow: 0 0 0 3px rgba(81, 207, 102, 0.2);
}

/* ========================================
   CANVAS WRAPPER
   ======================================== */
.spartaco-canvas-wrapper {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--canvas-bg-dark);
    border: 1px solid var(--canvas-border);
    border-top: none;
    border-radius: 0 0 var(--canvas-radius) var(--canvas-radius);
    padding: 32px;
    box-shadow: var(--canvas-shadow-sm);
}

.spartaco-canvas {
    display: block;
    max-width: 100%;
    height: auto;
    border: 1px solid var(--canvas-border);
    border-radius: var(--canvas-radius-sm);
    cursor: crosshair;
    box-shadow: var(--canvas-shadow);
    background: var(--canvas-bg);
    touch-action: none;
    transition: var(--canvas-transition);
}

.spartaco-canvas:hover {
    box-shadow: var(--canvas-shadow-lg);
}

/* ========================================
   GALLERY
   ======================================== */
.spartaco-canvas-gallery {
    display: grid;
    gap: 24px;
    margin: 40px 0;
}

.spartaco-canvas-gallery.columns-2 {
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
}

.spartaco-canvas-gallery.columns-3 {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.spartaco-canvas-gallery.columns-4 {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
}

.spartaco-canvas-gallery-item {
    position: relative;
    background: var(--canvas-bg);
    border-radius: var(--canvas-radius);
    overflow: hidden;
    box-shadow: var(--canvas-shadow-sm);
    transition: var(--canvas-transition);
}

.spartaco-canvas-gallery-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--canvas-shadow-lg);
}

.spartaco-canvas-gallery-item-image {
    position: relative;
    width: 100%;
    padding-bottom: 75%;
    overflow: hidden;
    background: var(--canvas-bg-light);
}

.spartaco-canvas-gallery-item-image img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--canvas-transition);
}

.spartaco-canvas-gallery-item:hover .spartaco-canvas-gallery-item-image img {
    transform: scale(1.05);
}

.spartaco-canvas-gallery-item-content {
    padding: 16px;
}

.spartaco-canvas-gallery-item-title {
    margin: 0 0 8px 0;
    font-size: 16px;
    font-weight: 500;
    color: var(--canvas-text);
    line-height: 1.4;
}

.spartaco-canvas-gallery-item-title a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s;
}

.spartaco-canvas-gallery-item-title a:hover {
    color: var(--canvas-primary);
}

.spartaco-canvas-gallery-item-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: var(--canvas-text-light);
}

/* ========================================
   LOADING STATE
   ======================================== */
.spartaco-canvas-loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--canvas-border);
    border-top-color: var(--canvas-primary);
    border-radius: 50%;
    animation: canvas-spin 0.8s linear infinite;
}

@keyframes canvas-spin {
    to { transform: rotate(360deg); }
}

/* ========================================
   RESPONSIVE
   ======================================== */
@media (max-width: 768px) {
    .spartaco-canvas-toolbar {
        padding: 16px;
        gap: 16px;
    }

    .canvas-tool {
        font-size: 13px;
    }

    .canvas-tool-btn {
        padding: 8px 12px;
        font-size: 13px;
    }

    .canvas-brush-wrapper {
        min-width: 140px;
    }

    .spartaco-canvas-wrapper {
        padding: 16px;
    }

    .spartaco-canvas-gallery {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)) !important;
        gap: 16px;
    }
}

@media (max-width: 480px) {
    .spartaco-canvas-toolbar {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }

    .canvas-tool {
        justify-content: space-between;
    }

    .canvas-tool-btn {
        width: 100%;
        justify-content: center;
    }

    .canvas-color-palette {
        min-width: auto;
        width: calc(100vw - 40px);
    }

    .canvas-palette-colors {
        grid-template-columns: repeat(6, 1fr);
    }
}

/* ========================================
   ACCESSIBILITY
   ======================================== */
.canvas-tool-btn:focus,
.canvas-color-current:focus,
.canvas-brush-size:focus {
    outline: 2px solid var(--canvas-primary);
    outline-offset: 2px;
}

/* ========================================
   PRINT
   ======================================== */
@media print {
    .spartaco-canvas-toolbar {
        display: none;
    }

    .spartaco-canvas-wrapper {
        box-shadow: none;
        border: 1px solid #ddd;
        padding: 0;
    }
}