:root{--primary:#4361ee;--primary-dark:#3a56d4;--secondary:#7209b7;--success:#06d6a0;--danger:#ef476f;--warning:#ffd166;--info:#118ab2;--light:#f8f9fa;--dark:#212529;--gray:#6c757d;--light-gray:#e9ecef;--border-radius:12px;--box-shadow:0 8px 25px rgba(0, 0, 0, 0.1);--transition:all 0.3s ease}*{margin:0;padding:0;box-sizing:border-box}body{font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif;display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;background:linear-gradient(135deg,#f5f7fa 0,#e4edf5 100%);color:var(--dark);padding:20px}.container{background-color:#fff;padding:30px 40px;border-radius:var(--border-radius);box-shadow:var(--box-shadow);text-align:center;width:100%;max-width:900px;margin-bottom:20px;position:relative;overflow:hidden}.container::before{content:'';position:absolute;top:0;left:0;right:0;height:5px;background:linear-gradient(90deg,var(--primary),var(--secondary))}h1{color:var(--primary);margin-bottom:15px;font-size:2.2em;display:flex;align-items:center;justify-content:center;gap:12px}.app-info-container{width:100%;border:1px solid var(--light-gray);border-radius:var(--border-radius);margin-bottom:25px;overflow:hidden}.app-info-header{background-color:var(--light);padding:12px 15px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;color:var(--info)}.app-info-header .toggle-icon{transition:transform .3s}.app-info-header.collapsed .toggle-icon{transform:rotate(-90deg)}.app-info-content{padding:15px;background-color:#fff;border-top:1px solid var(--light-gray);display:block;text-align:left;font-size:.95em;line-height:1.6}.app-info-container.collapsed .app-info-content{display:none}.status{padding:12px 20px;border-radius:8px;margin:20px 0;font-weight:600;font-size:.95em;display:flex;align-items:center;gap:10px}.status.info{background-color:rgba(17,138,178,.1);color:var(--info);border-left:4px solid var(--info)}.status.success{background-color:rgba(6,214,160,.1);color:var(--success);border-left:4px solid var(--success)}.status.error{background-color:rgba(239,71,111,.1);color:var(--danger);border-left:4px solid var(--danger)}.converter-grid{display:grid;gap:20px;text-align:left;margin-bottom:20px}.input-group label{display:block;margin-bottom:8px;color:var(--gray);font-weight:600;font-size:.9em;display:flex;justify-content:space-between;align-items:center}.label-badge{background:var(--light);padding:2px 8px;border-radius:4px;font-size:.85em;color:var(--primary);border:1px solid #ddd}.input-wrapper{display:flex;align-items:stretch;box-shadow:0 2px 5px rgba(0,0,0,.02);border-radius:8px;overflow:hidden;border:1px solid var(--light-gray);transition:var(--transition)}.input-wrapper:focus-within{border-color:var(--primary);box-shadow:0 0 0 3px rgba(67,97,238,.15)}.input-icon{background-color:#f8f9fa;padding:0 15px;display:flex;align-items:center;justify-content:center;color:var(--gray);border-right:1px solid var(--light-gray);min-width:50px}input[type=number],input[type=text]{width:100%;padding:12px 15px;border:none;font-family:Consolas,Monaco,monospace;font-size:1.05em;color:var(--dark);outline:0;background:#fff}.copy-btn{background:#fff;border:none;border-left:1px solid var(--light-gray);color:var(--info);padding:0 15px;cursor:pointer;transition:var(--transition)}.copy-btn:hover{background-color:var(--info);color:#fff}.custom-base-row{display:flex;gap:15px}.base-select-wrapper{flex:0 0 120px}.custom-input-wrapper{flex:1}.action-bar{display:flex;gap:15px;margin:25px 0;justify-content:center}.main-btn{background:linear-gradient(to right,var(--primary),var(--secondary));color:#fff;border:none;padding:10px 25px;border-radius:8px;cursor:pointer;font-weight:600;box-shadow:0 4px 15px rgba(67,97,238,.3);display:flex;align-items:center;gap:8px}.secondary-btn{background:#fff;color:var(--danger);border:1px solid var(--danger);padding:10px 25px;border-radius:8px;cursor:pointer;font-weight:600;display:flex;align-items:center;gap:8px}.secondary-btn:hover{background:var(--danger);color:#fff}#historyContainer{margin-top:30px;width:100%;text-align:left;background-color:#fff;border-radius:var(--border-radius);box-shadow:var(--box-shadow);padding:25px;box-sizing:border-box;display:none;border-top:3px solid var(--info)}#historyContainer.show{display:block;animation:.5s fadeIn}#historyContainer h2{color:var(--info);font-size:1.5em;margin-bottom:20px;display:flex;align-items:center;gap:10px}#historyList{list-style:none;padding:0;max-height:300px;overflow-y:auto;border:1px solid var(--light-gray);border-radius:8px;background-color:#fbfdff}#historyList li{display:flex;justify-content:space-between;align-items:center;padding:12px 15px;border-bottom:1px solid #eee;font-size:.9em}.history-val{font-family:monospace;color:var(--primary-dark);background:rgba(67,97,238,.1);padding:2px 6px;border-radius:4px;margin:0 4px}.history-arrow{color:var(--gray);margin:0 8px}.clear-history-btn{background:0 0;border:none;color:var(--danger);cursor:pointer}@keyframes fadeIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}footer{margin-top:20px;color:var(--gray);font-size:.9em;text-align:center;padding:15px}@media (max-width:768px){.custom-base-row{flex-direction:column;gap:0}.base-select-wrapper{margin-bottom:20px}}