CSS Cascade Layers (@layer) let you control style precedence without fighting specificity. Here's how to use them.
Basic Layers
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Layer Precedence
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Anonymous Layers
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Nested Layers
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Importing with Layers
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Framework Integration
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Unlayered Styles
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Design System Layers
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Component Variants
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Media Query Layers
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Specificity Within Layers
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Revert Layer
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Print Styles
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JavaScript Layer Detection
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Best Practices
Structure:
✓ Declare layer order upfront
✓ Use descriptive layer names
✓ Nest related sub-layers
✓ Keep utilities last
Third-Party:
✓ Layer external CSS
✓ Your code in higher layers
✓ Avoid !important wars
✓ Document layer structure
Architecture:
✓ reset → base → components → utilities
✓ Consistent naming convention
✓ Single responsibility layers
✓ Document layer purposes
Avoid:
✗ Too many layers
✗ Deeply nested layers
✗ Unlayered styles mixed in
✗ Ignoring specificity within layers
Conclusion
CSS Cascade Layers provide explicit control over style precedence without specificity hacks. Define layer order upfront, use them for design systems with reset, base, components, and utilities layers. Import third-party CSS into lower-precedence layers. Remember that unlayered styles always win, and use revert-layer to fall back to previous layer values.