.calculator-container{width:90%;max-width:700px;margin:0 auto 20px auto;display:flex;background:#fff;border-radius:10px;box-shadow:0 2px 10px rgb(0 0 0 / .1);overflow:hidden;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen-Sans,Ubuntu,Cantarell,"Helvetica Neue",sans-serif;height:500px;max-height:500px;position:relative}.calculator{width:60%;padding:15px;display:flex;flex-direction:column;min-height:100%}.history-panel{width:40%;background:#f8f9fa;padding:15px;border-left:1px solid #eaeaea;display:flex;flex-direction:column;min-height:100%;height:100%}.calc-display{background:#f8f9fa;border-radius:5px;padding:15px;margin-bottom:15px;text-align:right;border:1px solid #ddd;flex-shrink:0}.calc-input{font-size:18px;color:#666;min-height:18px;margin-bottom:5px;overflow:hidden;text-overflow:ellipsis}.calc-result{font-size:28px;font-weight:700;color:#333;min-height:35px;overflow:hidden;text-overflow:ellipsis}.calc-buttons{display:grid;grid-template-columns:repeat(5,1fr);gap:6px;flex:1;min-height:0}.calc-btn{padding:12px 8px;border:1px solid #ccc;background:#fff;font-size:18px;cursor:pointer;border-radius:3px;font-weight:700;transition:all 0.2s ease;min-height:50px}.calc-btn:hover{background:#f5f5f5}.calc-btn:active{transform:scale(.98)}.calc-number{background:#fff;color:#333}.calc-operator{background:#0073aa;color:#fff;border-color:#0073aa}.calc-equals{background:#46b450;color:#fff;border-color:#46b450}.calc-clear{background:#dc3232;color:#fff;border-color:#dc3232}.calc-function{background:#72777c;color:#fff;border-color:#72777c}.calc-memory{background:#ffb900;color:#333;border-color:#ffb900}.history-panel h3{margin:0 0 15px 0;color:#333;padding-bottom:10px;border-bottom:2px solid #0073aa;font-size:16px;flex-shrink:0}.history-content{flex:1;overflow-y:auto;min-height:0;padding-right:5px;max-height:calc(100% - 80px)}.history-item{padding:12px;margin-bottom:10px;background:#fff;border-radius:5px;box-shadow:0 1px 3px rgb(0 0 0 / .1);border-left:3px solid #0073aa;flex-shrink:0;position:relative}.history-expression{font-size:12px;color:#666;margin-bottom:3px;word-break:break-all}.history-result{font-size:14px;font-weight:700;color:#333;word-break:break-all;margin-bottom:8px}.history-comment{font-size:11px;color:#555;font-style:italic;background:#f0f8ff;padding:6px 8px;border-radius:3px;border-left:2px solid #0073aa;margin-top:5px}.history-actions-item{display:flex;gap:5px;margin-top:8px}.comment-btn{background:#0073aa;color:#fff;border:none;padding:4px 8px;border-radius:3px;font-size:10px;cursor:pointer;font-weight:700;transition:background 0.2s ease}.comment-btn:hover{background:#005a87}.history-actions{display:flex;gap:8px;margin-top:15px;flex-shrink:0}.history-btn{flex:1;padding:10px;border:none;border-radius:5px;cursor:pointer;font-weight:700;font-size:14px;transition:background-color 0.2s ease}.download-btn{background:#46b450;color:#fff}.download-btn:hover{background:#3a9542}.clear-history-btn{background:#72777c;color:#fff}.clear-history-btn:hover{background:#595c60}.comment-modal{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgb(0 0 0 / .5);z-index:1000;align-items:center;justify-content:center}.comment-modal.active{display:flex}.comment-modal-content{background:#fff;border-radius:10px;width:90%;max-width:400px;box-shadow:0 10px 30px rgb(0 0 0 / .3);overflow:hidden}.comment-modal-header{background:#0073aa;color:#fff;padding:15px 20px;display:flex;justify-content:space-between;align-items:center}.comment-modal-header h4{margin:0;font-size:16px}.comment-modal-close{background:none;border:none;color:#fff;font-size:20px;cursor:pointer;padding:0;width:24px;height:24px;display:flex;align-items:center;justify-content:center}.comment-modal-body{padding:20px}.calculation-preview{background:#f8f9fa;padding:10px;border-radius:5px;margin-bottom:15px;border:1px solid #eaeaea}.calculation-preview .history-expression{font-size:12px;color:#666;margin-bottom:2px}.calculation-preview .history-result{font-size:14px;font-weight:700;color:#333;margin-bottom:0}.comment-input{width:100%;height:80px;padding:10px;border:1px solid #ddd;border-radius:5px;resize:vertical;font-family:inherit;font-size:14px}.comment-input:focus{outline:none;border-color:#0073aa;box-shadow:0 0 0 2px rgb(0 115 170 / .1)}.comment-modal-actions{display:flex;gap:10px;padding:0 20px 20px}.comment-btn{flex:1;padding:10px;border:none;border-radius:5px;cursor:pointer;font-weight:700;font-size:14px;transition:background 0.2s ease}.comment-cancel{background:#72777c;color:#fff}.comment-cancel:hover{background:#595c60}.comment-save{background:#46b450;color:#fff}.comment-save:hover{background:#3a9542}.download-modal{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgb(0 0 0 / .5);z-index:1000;align-items:center;justify-content:center}.download-modal.active{display:flex}.download-modal-content{background:#fff;border-radius:10px;width:90%;max-width:400px;box-shadow:0 10px 30px rgb(0 0 0 / .3);overflow:hidden}.download-modal-header{background:#46b450;color:#fff;padding:15px 20px;display:flex;justify-content:space-between;align-items:center}.download-modal-header h4{margin:0;font-size:16px}.download-modal-close{background:none;border:none;color:#fff;font-size:20px;cursor:pointer;padding:0;width:24px;height:24px;display:flex;align-items:center;justify-content:center}.download-modal-body{padding:20px}.download-options{display:flex;flex-direction:column;gap:10px;margin-top:15px}.download-option-btn{display:flex;flex-direction:column;align-items:flex-start;padding:15px;border:2px solid #eaeaea;border-radius:8px;background:#fff;cursor:pointer;transition:all 0.2s ease;width:100%;text-align:left}.download-option-btn:hover{border-color:#0073aa;background:#f8f9fa}.download-icon{font-size:24px;margin-bottom:5px}.download-text{font-weight:700;color:#333;margin-bottom:2px}.download-desc{font-size:12px;color:#666}.history-content::-webkit-scrollbar{width:6px}.history-content::-webkit-scrollbar-track{background:#f1f1f1;border-radius:3px}.history-content::-webkit-scrollbar-thumb{background:#c1c1c1;border-radius:3px}.history-content::-webkit-scrollbar-thumb:hover{background:#a8a8a8}@media (max-width:500px){.calculator-container{flex-direction:column;height:auto;max-height:none;padding:15px}.calculator,.history-panel{width:100%;height:auto;min-height:400px}.history-panel{border-left:none;border-top:1px solid #eaeaea;min-height:300px}.calc-buttons{min-height:400px}.history-content{max-height:200px;min-height:200px}.comment-modal-content,.download-modal-content{width:95%;margin:20px}}