/**
 * ================================================================
 * Drawing - Canvas créatif et galerie (Mobile-First v3.23.0)
 * ================================================================
 *
 * Activité de dessin avec canvas HTML5, outils créatifs,
 * galerie collaborative et système de likes
 * Architecture mobile-first avec breakpoints progressifs
 *
 * @version 3.23.0
 */

/* ================================================================
   1. CSS VARIABLES
   ================================================================ */
:root {
    --cal-primary: #667eea; /* v3.9.4 - Fallback simplifié */
    --cal-secondary: #764ba2; /* v3.9.4 - Fallback simplifié */
    --cal-white: #FFFFFF;
    --cal-text: #2c3e50;
    --cal-text-muted: #666666;

    --drawing-gradient: linear-gradient(135deg, var(--cal-primary) 0%, var(--cal-secondary) 100%);
    --drawing-like: #ff6b9d;
    --drawing-like-secondary: #c06c84;
    --drawing-like-gradient: linear-gradient(135deg, var(--drawing-like) 0%, var(--drawing-like-secondary) 100%);
    --drawing-border: #e0e0e0;
    --drawing-bg-light: #f5f5f5;

    --cal-font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --cal-font-size-sm: 14px;
    --cal-font-size-base: 16px;
    --cal-font-size-lg: 18px;
    --cal-font-size-xl: 24px;
    --cal-font-size-2xl: 32px;

    --cal-spacing-xs: 8px;
    --cal-spacing-sm: 10px;
    --cal-spacing-md: 15px;
    --cal-spacing-lg: 20px;
    --cal-spacing-xl: 30px;
    --cal-spacing-2xl: 40px;
    --cal-spacing-3xl: 50px;

    --cal-shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --cal-shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --cal-shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.2);
    --cal-shadow-xl: 0 8px 20px rgba(0, 0, 0, 0.3);
    --cal-shadow-button: 0 4px 12px rgba(102, 126, 234, 0.4);
    --cal-shadow-button-hover: 0 6px 16px rgba(102, 126, 234, 0.5);
    --cal-shadow-tool: 0 4px 8px rgba(102, 126, 234, 0.3);

    --cal-radius-sm: 6px;
    --cal-radius-md: 8px;
    --cal-radius-lg: 12px;
    --cal-radius-xl: 20px;
    --cal-radius-full: 9999px;

    --cal-transition-base: 0.3s ease;
    --cal-transition-fast: 0.2s ease;
}

/* ================================================================
   2. CONTAINER
   ================================================================ */
.drawing-container {
    max-width: 100%;
    margin: 0 auto;
    padding: var(--cal-spacing-md);
    font-family: var(--cal-font-family);
}

@media (min-width: 768px) {
    .drawing-container {
        max-width: 900px;
        padding: var(--cal-spacing-lg);
    }
}

/* ================================================================
   3. HEADER
   ================================================================ */
.drawing-header {
    text-align: center;
    margin-bottom: var(--cal-spacing-xl);
}

.drawing-header h2 {
    font-size: var(--cal-font-size-xl);
    margin-bottom: var(--cal-spacing-md);
    color: var(--cal-text);
}

@media (min-width: 768px) {
    .drawing-header h2 {
        font-size: var(--cal-font-size-2xl);
    }
}

.drawing-prompt {
    background: var(--drawing-gradient);
    color: var(--cal-white);
    padding: var(--cal-spacing-sm) var(--cal-spacing-md);
    border-radius: var(--cal-radius-lg);
    display: flex;
    align-items: center;
    gap: var(--cal-spacing-sm);
    margin: 0 auto;
    max-width: 600px;
}

@media (min-width: 768px) {
    .drawing-prompt {
        padding: var(--cal-spacing-md) var(--cal-spacing-lg);
    }
}

.drawing-prompt .prompt-icon {
    font-size: 1.5em;
}

.drawing-prompt p {
    margin: 0;
    font-size: var(--cal-font-size-sm);
}

@media (min-width: 768px) {
    .drawing-prompt p {
        font-size: 1.1em;
    }
}

/* ================================================================
   4. TOOLBAR
   ================================================================ */
.drawing-toolbar {
    background: var(--cal-white);
    border: 2px solid var(--drawing-border);
    border-radius: var(--cal-radius-lg);
    padding: var(--cal-spacing-md);
    margin-bottom: var(--cal-spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--cal-spacing-md);
    align-items: stretch;
    box-shadow: var(--cal-shadow-sm);
}

@media (min-width: 768px) {
    .drawing-toolbar {
        padding: var(--cal-spacing-lg);
        flex-direction: row;
        flex-wrap: wrap;
        align-items: center;
        gap: var(--cal-spacing-lg);
    }
}

.toolbar-section {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--cal-spacing-sm);
    flex-wrap: wrap;
}

.toolbar-section label {
    font-weight: 600;
    color: var(--cal-text);
    white-space: nowrap;
}

/* ================================================================
   5. TOOL BUTTONS
   ================================================================ */
.tool-btn {
    background: var(--cal-white);
    border: 2px solid var(--drawing-border);
    border-radius: var(--cal-radius-md);
    width: 50px;
    height: 50px;
    cursor: pointer;
    transition: all var(--cal-transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5em;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    transform: translate3d(0, 0, 0);
}

.tool-btn:hover {
    border-color: var(--cal-primary);
    transform: translateY(-2px) translate3d(0, 0, 0);
    box-shadow: var(--cal-shadow-tool);
}

@media (hover: none) {
    .tool-btn:active {
        opacity: 0.85;
        transform: scale(0.95) translate3d(0, 0, 0);
    }
}

.tool-btn.active {
    background: var(--drawing-gradient);
    border-color: var(--cal-primary);
    color: var(--cal-white);
}

/* ================================================================
   6. COLOR PALETTE
   ================================================================ */
.color-palette {
    display: flex;
    gap: var(--cal-spacing-xs);
    flex-wrap: wrap;
    justify-content: center;
}

.color-btn {
    width: 40px;
    height: 40px;
    border: 2px solid var(--drawing-border);
    border-radius: var(--cal-radius-sm);
    cursor: pointer;
    transition: all var(--cal-transition-fast);
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    transform: translate3d(0, 0, 0);
}

.color-btn:hover {
    transform: scale(1.1) translate3d(0, 0, 0);
    box-shadow: var(--cal-shadow-md);
}

@media (hover: none) {
    .color-btn:active {
        opacity: 0.9;
        transform: scale(1.05) translate3d(0, 0, 0);
    }
}

.color-btn.active {
    border: 3px solid var(--cal-text);
    transform: scale(1.15) translate3d(0, 0, 0);
    box-shadow: 0 0 0 2px var(--cal-white), 0 0 0 4px var(--cal-primary);
}

.custom-color-input {
    width: 40px;
    height: 40px;
    border: 2px solid var(--drawing-border);
    border-radius: var(--cal-radius-sm);
    cursor: pointer;
    background: var(--cal-white);
}

/* ================================================================
   7. BRUSH SIZE SLIDER
   ================================================================ */
.brush-size-slider {
    width: 120px;
    height: 8px;
    border-radius: 4px;
    background: var(--drawing-border);
    outline: none;
    cursor: pointer;
}

.brush-size-slider::-webkit-slider-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: var(--cal-radius-full);
    background: var(--drawing-gradient);
    cursor: pointer;
    border: 2px solid var(--cal-white);
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.brush-size-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: var(--cal-radius-full);
    background: var(--drawing-gradient);
    cursor: pointer;
    border: 2px solid var(--cal-white);
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.size-value {
    font-weight: 600;
    color: var(--cal-primary);
    min-width: 40px;
}

/* ================================================================
   8. ACTION BUTTONS
   ================================================================ */
.toolbar-actions {
    display: flex;
    gap: var(--cal-spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

@media (min-width: 768px) {
    .toolbar-actions {
        margin-left: auto;
    }
}

.action-btn {
    background: var(--cal-white);
    border: 2px solid var(--drawing-border);
    border-radius: var(--cal-radius-md);
    padding: var(--cal-spacing-sm) var(--cal-spacing-md);
    cursor: pointer;
    transition: all var(--cal-transition-base);
    display: flex;
    align-items: center;
    gap: var(--cal-spacing-xs);
    font-weight: 600;
    color: var(--cal-text);
    min-height: 48px;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    transform: translate3d(0, 0, 0);
}

.action-btn:hover {
    border-color: var(--cal-primary);
    color: var(--cal-primary);
    transform: translateY(-2px) translate3d(0, 0, 0);
    box-shadow: var(--cal-shadow-tool);
}

@media (hover: none) {
    .action-btn:active {
        opacity: 0.85;
        transform: scale(0.98) translate3d(0, 0, 0);
    }
}

.action-btn .btn-icon {
    font-size: 1.3em;
}

/* ================================================================
   9. CANVAS
   ================================================================ */
.canvas-wrapper {
    background: var(--cal-white);
    border: 3px solid var(--drawing-border);
    border-radius: var(--cal-radius-lg);
    padding: 5px;
    margin-bottom: var(--cal-spacing-lg);
    box-shadow: var(--cal-shadow-md);
    display: flex;
    justify-content: center;
    overflow: auto;
    transform: translate3d(0, 0, 0);
}

@media (min-width: 768px) {
    .canvas-wrapper {
        padding: var(--cal-spacing-sm);
    }
}

#drawing-canvas {
    display: block;
    background: var(--cal-white);
    border-radius: var(--cal-radius-md);
    cursor: crosshair;
    touch-action: none;
    max-width: 100%;
    height: auto;
}

/* ================================================================
   10. SUBMIT BUTTON
   ================================================================ */
.drawing-actions {
    text-align: center;
    margin-top: var(--cal-spacing-lg);
}

.submit-drawing-btn {
    background: var(--drawing-gradient);
    color: var(--cal-white);
    border: none;
    border-radius: var(--cal-radius-lg);
    padding: var(--cal-spacing-sm) var(--cal-spacing-lg);
    font-size: var(--cal-font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--cal-transition-base);
    display: inline-flex;
    align-items: center;
    gap: var(--cal-spacing-sm);
    box-shadow: var(--cal-shadow-button);
    min-height: 56px;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    transform: translate3d(0, 0, 0);
    backface-visibility: hidden;
}

@media (min-width: 768px) {
    .submit-drawing-btn {
        padding: var(--cal-spacing-md) var(--cal-spacing-xl);
        font-size: 1.1em;
    }
}

.submit-drawing-btn:hover {
    transform: translateY(-2px) translate3d(0, 0, 0);
    box-shadow: var(--cal-shadow-button-hover);
}

@media (hover: none) {
    .submit-drawing-btn:active {
        opacity: 0.85;
        transform: scale(0.98) translate3d(0, 0, 0);
    }
}

.submit-drawing-btn.loading {
    opacity: 0.7;
    cursor: not-allowed;
}

.submit-drawing-btn .btn-icon {
    font-size: 1.3em;
}

/* ================================================================
   11. COMPLETED STATE
   ================================================================ */
.drawing-completed {
    text-align: center;
}

.user-drawing-result {
    background: var(--cal-white);
    border: 2px solid var(--drawing-border);
    border-radius: var(--cal-radius-lg);
    padding: var(--cal-spacing-lg);
    margin-bottom: var(--cal-spacing-lg);
    box-shadow: var(--cal-shadow-md);
}

@media (min-width: 768px) {
    .user-drawing-result {
        padding: var(--cal-spacing-xl);
    }
}

.user-drawing-result h3 {
    font-size: var(--cal-font-size-lg);
    margin-bottom: var(--cal-spacing-lg);
    color: var(--cal-text);
}

@media (min-width: 768px) {
    .user-drawing-result h3 {
        font-size: 1.8em;
    }
}

.drawing-preview {
    margin: var(--cal-spacing-lg) 0;
}

.submitted-drawing-img {
    max-width: 100%;
    height: auto;
    border: 2px solid var(--drawing-border);
    border-radius: var(--cal-radius-md);
    box-shadow: var(--cal-shadow-md);
}

.submitted-date {
    color: var(--cal-text-muted);
    font-size: var(--cal-font-size-sm);
    margin-top: var(--cal-spacing-md);
}

.submitted-date .date-icon {
    margin-right: 5px;
}

/* ================================================================
   12. GALLERY BUTTON
   ================================================================ */
.drawing-gallery-section {
    margin-top: var(--cal-spacing-lg);
    text-align: center;
}

.view-drawings-btn {
    background: var(--drawing-gradient);
    color: var(--cal-white);
    border: none;
    border-radius: var(--cal-radius-lg);
    padding: var(--cal-spacing-sm) var(--cal-spacing-lg);
    font-size: var(--cal-font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--cal-transition-base);
    display: inline-flex;
    align-items: center;
    gap: var(--cal-spacing-sm);
    box-shadow: var(--cal-shadow-button);
    min-height: 56px;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    transform: translate3d(0, 0, 0);
    backface-visibility: hidden;
}

@media (min-width: 768px) {
    .view-drawings-btn {
        padding: var(--cal-spacing-md) var(--cal-spacing-xl);
        font-size: 1.1em;
    }
}

.view-drawings-btn:hover {
    transform: translateY(-2px) translate3d(0, 0, 0);
    box-shadow: var(--cal-shadow-button-hover);
}

@media (hover: none) {
    .view-drawings-btn:active {
        opacity: 0.85;
        transform: scale(0.98) translate3d(0, 0, 0);
    }
}

.drawings-count {
    opacity: 0.9;
    font-size: 0.95em;
}

/* ================================================================
   13. GALLERY MODAL
   ================================================================ */
.drawings-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    z-index: 9999;
    overflow-y: auto;
    padding: var(--cal-spacing-2xl) var(--cal-spacing-lg);
    transform: translate3d(0, 0, 0);
}

.drawings-modal.active {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.drawings-modal-close {
    position: fixed;
    top: var(--cal-spacing-lg);
    right: var(--cal-spacing-lg);
    background: var(--cal-white);
    border: none;
    border-radius: var(--cal-radius-full);
    width: 40px;
    height: 40px;
    font-size: 1.5em;
    cursor: pointer;
    z-index: 10001;
    transition: all var(--cal-transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--cal-shadow-md);
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    transform: translate3d(0, 0, 0);
}

@media (min-width: 768px) {
    .drawings-modal-close {
        width: 50px;
        height: 50px;
        font-size: 2em;
    }
}

.drawings-modal-close:hover {
    transform: rotate(90deg) scale(1.1) translate3d(0, 0, 0);
    background: #ff4444;
    color: var(--cal-white);
}

@media (hover: none) {
    .drawings-modal-close:active {
        opacity: 0.85;
        transform: scale(0.95) translate3d(0, 0, 0);
    }
}

.drawings-modal-header {
    text-align: center;
    color: var(--cal-white);
    margin-bottom: var(--cal-spacing-xl);
}

.drawings-modal-header h2 {
    font-size: 1.8em;
    margin-bottom: var(--cal-spacing-sm);
}

@media (min-width: 768px) {
    .drawings-modal-header h2 {
        font-size: 2.5em;
    }
}

.drawings-modal-header p {
    font-size: 1em;
    opacity: 0.9;
}

@media (min-width: 768px) {
    .drawings-modal-header p {
        font-size: 1.2em;
    }
}

.drawings-modal-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--cal-spacing-lg);
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
}

@media (min-width: 480px) {
    .drawings-modal-content {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
        gap: 25px;
    }
}

/* ================================================================
   14. DRAWING CARDS
   ================================================================ */
.drawing-card {
    background: var(--cal-white);
    border-radius: var(--cal-radius-lg);
    overflow: hidden;
    box-shadow: var(--cal-shadow-lg);
    transition: all var(--cal-transition-base);
    transform: translate3d(0, 0, 0);
}

.drawing-card:hover {
    transform: translateY(-5px) translate3d(0, 0, 0);
    box-shadow: var(--cal-shadow-xl);
}

.drawing-image {
    width: 100%;
    height: 250px;
    overflow: hidden;
    background: var(--drawing-bg-light);
}

.drawing-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.drawing-footer {
    padding: var(--cal-spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.drawing-author {
    display: flex;
    align-items: center;
    gap: var(--cal-spacing-sm);
}

.author-avatar {
    width: 35px;
    height: 35px;
    border-radius: var(--cal-radius-full);
    border: 2px solid var(--drawing-border);
}

.author-name {
    font-weight: 600;
    color: var(--cal-text);
}

.like-btn {
    background: var(--cal-white);
    border: 2px solid var(--drawing-border);
    border-radius: 20px;
    padding: var(--cal-spacing-xs) var(--cal-spacing-md);
    cursor: pointer;
    transition: all var(--cal-transition-base);
    display: flex;
    align-items: center;
    gap: 5px;
    font-weight: 600;
    min-height: 36px;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    transform: translate3d(0, 0, 0);
}

.like-btn:hover {
    border-color: var(--drawing-like);
    transform: scale(1.05) translate3d(0, 0, 0);
}

@media (hover: none) {
    .like-btn:active {
        opacity: 0.85;
        transform: scale(1.02) translate3d(0, 0, 0);
    }
}

.like-btn.liked {
    background: var(--drawing-like-gradient);
    border-color: var(--drawing-like);
    color: var(--cal-white);
}

.like-count {
    font-size: 0.95em;
}

.no-drawings {
    grid-column: 1 / -1;
    text-align: center;
    color: var(--cal-white);
    font-size: 1.1em;
    padding: 60px var(--cal-spacing-lg);
}

@media (min-width: 768px) {
    .no-drawings {
        font-size: 1.3em;
    }
}

.no-drawings p {
    opacity: 0.8;
}

/* ================================================================
   15. SUCCESS OVERLAY
   ================================================================ */
.success-overlay-drawing {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    z-index: 10000;
    padding: var(--cal-spacing-lg);
    transform: translate3d(0, 0, 0);
}

.success-overlay-drawing[style*="display: block"],
.success-overlay-drawing[style*="display: flex"] {
    display: flex !important;
    align-items: center;
    justify-content: center;
}

.success-content {
    background: var(--cal-white);
    border-radius: var(--cal-radius-xl);
    padding: var(--cal-spacing-xl) var(--cal-spacing-lg);
    text-align: center;
    max-width: 500px;
    width: 100%;
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
    transform: translate3d(0, 0, 0);
}

@media (min-width: 768px) {
    .success-content {
        padding: var(--cal-spacing-3xl);
    }
}

.success-icon {
    width: 60px;
    height: 60px;
    background: var(--drawing-gradient);
    color: var(--cal-white);
    border-radius: var(--cal-radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2em;
    margin: 0 auto var(--cal-spacing-lg);
}

@media (min-width: 768px) {
    .success-icon {
        width: 80px;
        height: 80px;
        font-size: 3em;
    }
}

.success-content h3 {
    font-size: var(--cal-font-size-xl);
    margin-bottom: var(--cal-spacing-md);
    color: var(--cal-text);
}

@media (min-width: 768px) {
    .success-content h3 {
        font-size: var(--cal-font-size-2xl);
    }
}

.success-content p {
    color: var(--cal-text-muted);
    font-size: var(--cal-font-size-base);
}

@media (min-width: 768px) {
    .success-content p {
        font-size: 1.1em;
    }
}

/* ================================================================
   16. SPINNER
   ================================================================ */
.spinner-small {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: var(--cal-white);
    border-radius: var(--cal-radius-full);
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg) translate3d(0, 0, 0); }
}