/* =============================================
   DrawKids — Lesson & Canvas Styles
   ============================================= */

/* ===== Lesson Experience ===== */
.lesson-experience {
    max-width: 900px;
    margin: 0 auto;
}

/* ===== Lesson Header ===== */
.lesson-header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.lesson-back {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-2) var(--space-3);
    background: var(--bg-surface);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: var(--text-sm);
    color: var(--text-secondary);
    transition: all var(--duration-fast);
    white-space: nowrap;
    min-height: 44px;
}

.lesson-back:hover {
    border-color: var(--primary-300);
    color: var(--primary-500);
}

.lesson-header-info {
    flex: 1;
    min-width: 0;
}

.lesson-header-title {
    font-size: var(--text-lg);
    font-weight: 800;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.lesson-header-meta {
    font-size: var(--text-xs);
    color: var(--text-muted);
}

/* ===== Progress Bar ===== */
.lesson-progress-bar {
    margin-bottom: var(--space-4);
}

.progress-track {
    height: 12px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--space-1);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--success-500), var(--primary-500));
    border-radius: var(--radius-full);
    transition: width var(--duration-slow) var(--ease-bouncy);
    min-width: 0;
}

.progress-label {
    font-size: var(--text-xs);
    font-weight: 700;
    color: var(--text-secondary);
}

/* ===== Step Indicator ===== */
.step-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-1);
    margin-bottom: var(--space-6);
    flex-wrap: wrap;
}

.step-dot {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-surface);
    border: 2px solid var(--gray-200);
    border-radius: 50%;
    font-size: var(--text-sm);
    font-weight: 700;
    color: var(--text-muted);
    transition: all var(--duration-medium) var(--ease-bouncy);
    flex-shrink: 0;
}

.step-dot.active {
    background: var(--primary-500);
    border-color: var(--primary-500);
    color: var(--text-inverse);
    transform: scale(1.2);
    box-shadow: var(--shadow-primary);
}

.step-dot.completed {
    background: var(--success-500);
    border-color: var(--success-500);
    color: white;
}

.step-line {
    width: 20px;
    height: 3px;
    background: var(--gray-200);
    border-radius: 2px;
    flex-shrink: 0;
}

.step-line.completed {
    background: var(--success-500);
}

/* ===== Lesson Intro ===== */
.lesson-intro {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--space-6);
    padding: var(--space-6);
    background: var(--bg-surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
}

.intro-preview {
    width: 100%;
    max-width: 300px;
    aspect-ratio: 1;
    background: linear-gradient(135deg, var(--primary-50), var(--secondary-50));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.intro-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.intro-image-placeholder {
    font-size: 5rem;
    opacity: 0.5;
}

.intro-info {
    max-width: 500px;
}

.intro-badge {
    display: inline-block;
    padding: var(--space-1) var(--space-3);
    background: var(--primary-50);
    color: var(--primary-500);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 700;
    margin-bottom: var(--space-2);
}

.intro-title {
    font-size: var(--text-3xl);
    font-weight: 900;
    margin-bottom: var(--space-2);
}

.intro-summary {
    font-size: var(--text-base);
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
}

.intro-details {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    margin-bottom: var(--space-4);
    flex-wrap: wrap;
}

.detail-item {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-secondary);
}

.intro-steps-list {
    text-align: right;
    margin-bottom: var(--space-6);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.intro-step-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    background: var(--gray-50);
    border-radius: var(--radius-md);
}

.intro-step-num {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-500);
    color: white;
    border-radius: 50%;
    font-size: var(--text-xs);
    font-weight: 700;
    flex-shrink: 0;
}

.intro-step-title {
    font-size: var(--text-sm);
    font-weight: 600;
}

.intro-start-btn {
    width: 100%;
    max-width: 300px;
}

/* ===== Drawing Area ===== */
.drawing-area {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.canvas-wrapper {
    position: relative;
    background: var(--bg-surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    /* مربع مثالي يطابق viewBox (0 0 400 400) ليرسم الطفل بدقة
       - 100%  : يتقلص على الشاشات الضيقة
       - 520px : الحد الأقصى على الشاشات الكبيرة
       - 62vh  : يضمن ظهور اللوحة + الأزرار دون تمرير كثير */
    width: min(100%, 520px, 62vh);
    aspect-ratio: 1 / 1;
    flex-shrink: 0;
    margin: 0 auto;
}

#drawingCanvas,
#referenceCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    touch-action: none;
}

#drawingCanvas {
    z-index: 2;
    cursor: crosshair;
}

#referenceCanvas {
    z-index: 1;
    pointer-events: none;
}

/* Step Overlay */
.step-overlay {
    position: absolute;
    inset: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(240, 249, 255, 0.92);
    backdrop-filter: blur(4px);
    transition: opacity var(--duration-slow);
}

.step-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.step-overlay-content {
    text-align: center;
    padding: var(--space-6);
}

.step-overlay-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: var(--space-3);
    animation: float 2s ease-in-out infinite;
}

.step-overlay-text {
    font-size: var(--text-xl);
    font-weight: 700;
    margin-bottom: var(--space-4);
}

/* ===== Instruction Card ===== */
.instruction-card {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4);
    background: var(--secondary-50);
    border: 2px solid var(--secondary-300);
    border-radius: var(--radius-xl);
}

.instruction-icon {
    font-size: 1.75rem;
    flex-shrink: 0;
}

.instruction-body {
    flex: 1;
    min-width: 0;
}

.instruction-title {
    font-size: var(--text-sm);
    font-weight: 800;
    color: var(--secondary-500);
    margin-bottom: 2px;
}

.instruction-text {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--text-primary);
}

.instruction-hint {
    flex-shrink: 0;
}

/* ===== Toolbar ===== */
.toolbar {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3);
    background: var(--bg-surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}

.toolbar::-webkit-scrollbar {
    display: none;
}

.toolbar-group {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    flex-shrink: 0;
}

.toolbar-divider {
    width: 2px;
    height: 28px;
    background: var(--gray-200);
    border-radius: 1px;
    flex-shrink: 0;
    margin: 0 var(--space-1);
}

.tool-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gray-50);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-size: 1.25rem;
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-standard);
    flex-shrink: 0;
    -webkit-tap-highlight-color: transparent;
}

.tool-btn:hover {
    background: var(--gray-100);
    transform: scale(1.05);
}

.tool-btn:active {
    transform: scale(0.95);
}

.tool-btn.active {
    background: var(--primary-50);
    border-color: var(--primary-500);
}

.tool-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
    transform: none;
}

.tool-danger:hover {
    background: var(--error-50);
    border-color: var(--error-500);
}

.tool-btn-lg {
    width: 52px;
    height: 52px;
    font-size: 1.5rem;
}

/* Color Picker */
.toolbar-colors {
    gap: var(--space-1);
}

.color-swatch {
    width: 36px;
    height: 36px;
    border: 3px solid transparent;
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-bouncy);
    flex-shrink: 0;
    box-shadow: inset 0 0 0 1px rgba(0,0,0,0.1);
}

.color-swatch:hover {
    transform: scale(1.15);
}

.color-swatch.active {
    border-color: var(--text-primary);
    transform: scale(1.2);
    box-shadow: 0 0 0 2px white, 0 2px 8px rgba(0,0,0,0.2);
}

/* Brush Size */
.brush-sizes {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: 0 var(--space-2);
}

.brush-size-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 2px solid transparent;
    border-radius: 50%;
    background: var(--gray-50);
    cursor: pointer;
    transition: all var(--duration-fast);
}

.brush-size-btn .dot {
    background: var(--text-primary);
    border-radius: 50%;
}

.brush-size-btn.active {
    border-color: var(--primary-500);
    background: var(--primary-50);
}

/* ===== Lesson Actions ===== */
.lesson-actions {
    display: flex;
    gap: var(--space-3);
}

.lesson-actions .btn {
    flex: 1;
}

/* ===== Coloring Screen ===== */
.coloring-screen {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal);
    background: var(--bg-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-4);
    overflow-y: auto;
}

.coloring-header {
    text-align: center;
    margin-bottom: var(--space-4);
}

.coloring-header h2 {
    font-size: var(--text-2xl);
    font-weight: 900;
}

.coloring-header p {
    color: var(--text-secondary);
}

.coloring-canvas-wrapper {
    width: min(100%, 520px, 72vh);
    aspect-ratio: 1 / 1;
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    position: relative;
    margin: 0 auto var(--space-4);
}

#coloringCanvas {
    width: 100%;
    height: 100%;
    touch-action: none;
}

.coloring-palette {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
    max-width: 500px;
}

.coloring-tools {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.coloring-save-btn {
    margin-bottom: var(--space-8);
}

/* ===== Success Overlay ===== */
.success-overlay {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal);
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
}

.success-card {
    position: relative;
    background: var(--bg-surface);
    border-radius: var(--radius-xl);
    padding: var(--space-8) var(--space-6);
    max-width: 420px;
    width: 100%;
    text-align: center;
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    animation: successPop var(--duration-slow) var(--ease-bouncy);
}

@keyframes successPop {
    0% { transform: scale(0.7); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

.confetti-container {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.confetti-piece {
    position: absolute;
    top: -20px;
    width: 12px;
    height: 12px;
    border-radius: 2px;
    animation: confettiFall 3s ease-in forwards;
}

@keyframes confettiFall {
    0% { transform: translateY(0) rotate(0deg); opacity: 1; }
    100% { transform: translateY(500px) rotate(720deg); opacity: 0; }
}

.success-artwork {
    width: 200px;
    height: 170px;
    margin: 0 auto var(--space-4);
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 3px solid var(--secondary-300);
}

.success-artwork img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.success-stars {
    font-size: 2rem;
    margin-bottom: var(--space-3);
    animation: starsPop 0.6s var(--ease-bouncy) both;
}

@keyframes starsPop {
    0% { transform: scale(0); }
    100% { transform: scale(1); }
}

.success-title {
    font-size: var(--text-3xl);
    font-weight: 900;
    margin-bottom: var(--space-2);
}

.success-message {
    color: var(--text-secondary);
    font-size: var(--text-lg);
    margin-bottom: var(--space-4);
}

.success-mascot {
    font-size: 3rem;
    margin-bottom: var(--space-4);
    animation: float 2s ease-in-out infinite;
}

.success-actions {
    display: flex;
    gap: var(--space-3);
}

.success-actions .btn {
    flex: 1;
}

/* ===== Responsive ===== */
@media (min-width: 768px) {
    .lesson-intro {
        flex-direction: row;
        text-align: right;
    }

    .intro-preview {
        flex-shrink: 0;
    }

    .intro-info {
        flex: 1;
    }

    .intro-start-btn {
        width: auto;
    }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
    .confetti-piece {
        display: none;
    }

    .success-card {
        animation: none;
    }
}