/* ================================== */
/* == Canvas Page Styles           == */
/* ================================== */

/* Main container uses flexbox to stack toolbar and canvas vertically */
.canvas-container {
    display: flex;
    flex-direction: column;
    height: 100%; /* Ensure it takes up the full page height */
    width: 100%;
    overflow: hidden; /* Prevent the container itself from scrolling */
    background:
      radial-gradient(circle at 20% 20%, color-mix(in srgb, var(--color-primary) 14%, transparent), transparent 40%),
      radial-gradient(circle at 80% 80%, color-mix(in srgb, var(--color-success) 12%, transparent), transparent 35%),
      var(--color-background);
}

/* Horizontal toolbar at the top */
.canvas-toolbar {
    display: flex;
    align-items: center;
    padding: var(--space-2) var(--space-4);
    background: color-mix(in srgb, var(--color-surface) 92%, transparent);
    border-bottom: 1px solid var(--color-card-border-inner);
    backdrop-filter: blur(10px);
    gap: var(--space-3);
    flex-shrink: 0;
    flex-wrap: wrap; /* Allows wrapping on smaller screens */
    box-shadow: inset 0 -1px 0 rgba(255, 255, 255, 0.02);
}

/* Visual separators for tool groups */
.canvas-toolbar .tool-group {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: 0 var(--space-3);
    border-right: 1px solid var(--color-border);
}
.canvas-toolbar .tool-group:last-child { border-right: none; }

/* Wrapper for the canvas element */
.canvas-wrapper {
    flex-grow: 1; /* Makes the wrapper fill remaining vertical space */
    overflow: auto; /* Adds scrollbars when the canvas is larger */
    position: relative;
    padding: var(--space-4); /* Padding around the canvas */
    display: flex;
    justify-content: center; /* Horizontally centers canvas */
    background:
      linear-gradient(transparent 23px, color-mix(in srgb, var(--color-border) 30%, transparent) 24px),
      linear-gradient(90deg, transparent 23px, color-mix(in srgb, var(--color-border) 25%, transparent) 24px);
    background-size: 24px 24px;
}

/* The drawing canvas itself */
#drawingCanvas {
    background-color: white;
    border-radius: var(--radius-base);
    border: 1px solid color-mix(in srgb, var(--color-border) 65%, transparent);
    box-shadow: 0 14px 45px rgba(0, 0, 0, 0.2), var(--shadow-md);
    cursor: crosshair;
    display: block; /* Prevent extra space below canvas */
    /* Width and height set dynamically in JS */
}

/* Toolbar Buttons */
.canvas-toolbar .tool-btn {
    width: 32px; height: 32px; /* Smaller buttons */
    border: none; background-color: transparent; color: var(--color-text-secondary);
    border-radius: var(--radius-base); cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: all var(--transition-fast); flex-shrink: 0;
    position: relative; /* For potential badges or indicators */
}
.canvas-toolbar .tool-btn:hover { background-color: var(--color-secondary); color: var(--color-primary); transform: scale(1.05); }
.canvas-toolbar .tool-btn.active { background: linear-gradient(135deg, color-mix(in srgb, var(--color-primary) 90%, #fff), var(--color-primary)); color: var(--color-btn-primary-text); transform: scale(1); box-shadow: 0 6px 14px color-mix(in srgb, var(--color-primary) 30%, transparent); }

/* Dropdowns */
.tool-dropdown { position: relative; display: inline-block; }
.tool-dropdown:hover .dropdown-content { display: block; opacity: 1; transform: translateY(0); }
.tool-dropdown .dropdown-content {
    display: none; opacity: 0; transform: translateY(-5px);
    position: absolute; background-color: var(--color-surface);
    min-width: 150px; /* Adjust width as needed */
    box-shadow: var(--shadow-lg); border-radius: var(--radius-base);
    border: 1px solid var(--color-card-border); padding: var(--space-2);
    z-index: 100; margin-top: var(--space-2);
    transition: opacity var(--duration-fast), transform var(--duration-fast);
}
.dropdown-content .tool-btn, .dropdown-content .filter-btn {
    width: 100%; justify-content: flex-start; gap: var(--space-2);
    padding: var(--space-2); background: none; text-align: left;
    font-weight: var(--font-weight-normal); font-size: var(--font-size-sm);
    border-radius: var(--radius-sm);
}
.dropdown-content .tool-btn:hover, .dropdown-content .filter-btn:hover {
    background-color: var(--color-secondary);
    color: var(--color-primary);
}
.dropdown-content .tool-btn i, .dropdown-content .filter-btn i {
    width: 16px; text-align: center; opacity: 0.8;
}

/* Brush Settings Controls */
.brush-settings {
    display: flex; align-items: center; gap: var(--space-3);
    background: color-mix(in srgb, var(--color-background) 85%, var(--color-surface)); padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-base); border: 1px solid var(--color-border);
}
.toolbar-label { display: flex; align-items: center; gap: var(--space-1); font-size: var(--font-size-xs); color: var(--color-text-secondary); }
.toolbar-label input[type="range"] { vertical-align: middle; height: 16px; cursor: pointer; max-width: 80px; }
.toolbar-label input[type="color"] { width: 24px; height: 24px; border: none; padding: 0; border-radius: var(--radius-sm); cursor: pointer; background: none; }
.toolbar-label input[type="checkbox"] { margin-right: 2px; }

/* Layers Panel Modal Styles */
.layers-panel { max-width: 350px; } /* Slightly narrower */
.layers-list { max-height: 40vh; overflow-y: auto; margin-bottom: var(--space-4); }
.layer-item {
    display: flex; align-items: center; gap: var(--space-3);
    padding: var(--space-2); border: 1px solid var(--color-border);
    border-radius: var(--radius-base); margin-bottom: var(--space-2);
    cursor: pointer; transition: all var(--transition-fast);
}
.layer-item:hover { background-color: var(--color-secondary); }
.layer-item.active { border-color: var(--color-primary); background-color: var(--color-bg-1); }

.layer-preview { width: 40px; height: 30px; border: 1px solid var(--color-border); border-radius: var(--radius-sm); overflow: hidden; background: white; flex-shrink: 0; }
.layer-preview canvas { width: 100%; height: 100%; display: block; }

.layer-info { flex-grow: 1; min-width: 0; }
.layer-info input[type="text"] { width: 100%; padding: var(--space-1); border-radius: var(--radius-sm); margin-bottom: var(--space-1); font-size: var(--font-size-sm); }
.layer-controls { display: flex; align-items: center; gap: var(--space-3); font-size: var(--font-size-xs); color: var(--color-text-secondary); }
.layer-controls label { display: flex; align-items: center; gap: var(--space-1); cursor: pointer; }
.layer-controls input[type="range"] { max-width: 80px; height: 16px; }

.layer-delete { background: none; border: none; color: var(--color-error); cursor: pointer; padding: var(--space-1); opacity: 0.7; }
.layer-delete:hover { opacity: 1; }
.layer-delete:disabled { opacity: 0.3; cursor: not-allowed; }

/* Responsive Canvas */
@media (max-width: 768px) {
    .canvas-toolbar { padding: var(--space-2); gap: var(--space-2); }
    .canvas-toolbar .tool-group { padding: 0 var(--space-2); }
    .canvas-wrapper { padding: var(--space-2); }
    .brush-settings { flex-wrap: wrap; } /* Allow settings to wrap */
}