/* Basic input state helpers */
.is-valid { border-color: #4caf50; background-color: rgba(76, 175, 80, 0.05); }
.is-invalid { border-color: #f44336; background-color: rgba(244, 67, 54, 0.05); }
.has-warning { border-color: #ff9800; background-color: rgba(255, 152, 0, 0.05); }