.checker-container{max-width:800px;margin:0 auto}.result-card{transition:all .3s;border-radius:8px;overflow:hidden}.result-card.is-leap{background:#d4edda;border-color:#c3e6cb}.result-card.not-leap{background:#f8d7da;border-color:#f5c6cb}.history-item{cursor:pointer;transition:all .3s;padding:10px;border-radius:8px}.history-item:hover{background:#f8f9fa}.info-card{border-left:4px solid #0d6efd;background:#f8f9fa;transition:all .3s}.info-card:hover{transform:translateX(5px)}.year-input{font-size:2rem;text-align:center;letter-spacing:2px}.animation-container{height:200px;position:relative;overflow:hidden}.earth-sun{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:150px;height:150px;border-radius:50%;animation:rotate 4s linear infinite}@keyframes rotate{from{transform:translate(-50%,-50%) rotate(0)}to{transform:translate(-50%,-50%) rotate(360deg)}}.next-leap-countdown{font-size:1.2rem;font-weight:700;text-align:center;margin:20px 0}
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