.iot-module-error-correction { margin-bottom: 30px; color: #333; }
.iot-ec-radio-lbl { cursor: pointer; display: inline-block; margin: 0; }
.iot-ec-radio-lbl input { display: none; }
.iot-ec-radio-box { display: inline-block; width: 34px; height: 34px; line-height: 32px; text-align: center; border: 2px solid #cbd5e1; border-radius: 6px; font-weight: bold; color: #475569; transition: all 0.2s; background: #fff; }
.iot-ec-radio-lbl input:checked + .iot-ec-radio-box { border-color: #2563EB; background: #2563EB; color: #fff; }

/* Trạng thái đáp án Radio */
.iot-ec-radio-lbl.iot-ec-wrong .iot-ec-radio-box { border-color: #dc2626; background: #fee2e2; color: #dc2626; }
.iot-ec-radio-lbl.iot-ec-correct .iot-ec-radio-box { border-color: #16a34a; background: #dcfce7; color: #16a34a; box-shadow: 0 0 0 2px #16a34a; }

/* Đồng bộ ô nhập liệu giống Fill in the Blanks */
.iot-ec-correction {
    border: none !important; border-bottom: 2px solid #94a3b8 !important; background: transparent !important;
    padding: 0 5px !important; margin: 0 5px !important; 
    font-size: 16px !important; line-height: 1.5 !important; font-family: inherit !important;
    color: #2563EB !important; font-weight: bold !important; text-align: center !important; 
    min-width: 120px !important; width: 120px !important; height: auto !important;
    transition: width 0.2s; outline: none !important; vertical-align: middle;
}
.iot-ec-correction:focus { border-bottom-color: #2563EB !important; }
.iot-ec-correction.iot-input-correct { background: #dcfce7 !important; color: #16a34a !important; border-bottom-color: transparent !important; border-radius: 4px !important; }
.iot-ec-correction.iot-input-wrong { background: #fee2e2 !important; color: #dc2626 !important; border-bottom-color: transparent !important; border-radius: 4px !important; text-decoration: line-through; }
.iot-ec-correction.iot-input-empty { background: #fef08a !important; border-bottom-color: transparent !important; border-radius: 4px !important; }