:root{--primary-color:#4361ee;--secondary-color:#3a0ca3;--accent-color:#7209b7;--light-color:#f8f9fa;--dark-color:#212529;--gray-color:#6c757d;--success-color:#4cc9f0;--warning-color:#f72585;--currency-color:#ff9e00;--border-radius:12px;--box-shadow:0 8px 24px rgba(0,0,0,0.1);--transition:all 0.3s ease}*{margin:0;padding:0;box-sizing:border-box;font-family:'Segoe UI','Microsoft YaHei',sans-serif}body{background-color:#f0f2f5;color:var(--dark-color);line-height:1.6;padding:20px;min-height:100vh}.container{width:100%;max-width:1200px;margin:0 auto}.header{text-align:center;margin-bottom:30px;padding-bottom:20px;border-bottom:2px solid #e9ecef}.header h1{font-size:2.5rem;color:var(--secondary-color);margin-bottom:10px}.header p{color:var(--gray-color);font-size:1.1rem}.header .highlight{color:var(--currency-color);font-weight:600}.main-content{display:flex;flex-direction:column;gap:30px}.converter-card{background:white;border-radius:var(--border-radius);padding:30px;box-shadow:var(--box-shadow);margin-bottom:20px}.card-title{font-size:1.4rem;margin-bottom:20px;color:var(--secondary-color);display:flex;align-items:center;gap:10px}.converter-form{display:flex;flex-wrap:wrap;gap:20px;margin-bottom:25px}.form-group{flex:1;min-width:200px}.form-group label{display:block;margin-bottom:8px;font-weight:600;color:var(--dark-color)}.amount-input{width:100%;padding:15px;border:2px solid #e0e0e0;border-radius:8px;font-size:1.2rem;font-weight:600;transition:var(--transition);text-align:right}.amount-input:focus{outline:none;border-color:var(--primary-color)}.currency-selector{display:flex;align-items:center;gap:10px;border:2px solid #e0e0e0;border-radius:8px;padding:10px;background-color:white;transition:var(--transition)}.currency-selector:focus-within{border-color:var(--primary-color)}.currency-flag{font-size:1.8rem}.currency-select{flex:1;border:none;padding:8px;font-size:1rem;background:none;outline:none;cursor:pointer}.swap-container{display:flex;justify-content:center;align-items:center;margin:10px 0}.swap-btn{background-color:var(--primary-color);color:white;border:none;width:50px;height:50px;border-radius:50%;cursor:pointer;transition:var(--transition);display:flex;align-items:center;justify-content:center;font-size:1.2rem}.swap-btn:hover{background-color:var(--secondary-color);transform:rotate(180deg)}.result-container{background:#f8f9fa;border-radius:var(--border-radius);padding:25px;margin-top:20px;text-align:center}.result-amount{font-size:2.5rem;font-weight:700;color:var(--currency-color);margin-bottom:10px}.result-details{font-size:1.1rem;color:var(--gray-color);margin-bottom:15px}.result-rate{font-size:1.2rem;font-weight:600;color:var(--dark-color);background:white;padding:10px 20px;border-radius:8px;display:inline-block}.action-buttons{display:flex;gap:15px;flex-wrap:wrap;margin-top:25px}.action-btn{padding:12px 24px;border-radius:8px;border:none;font-weight:600;cursor:pointer;transition:var(--transition);display:flex;align-items:center;gap:8px;font-size:1rem}.btn-primary{background-color:var(--primary-color);color:white}.btn-primary:hover{background-color:var(--secondary-color)}.btn-secondary{background-color:#e9ecef;color:var(--dark-color)}.btn-secondary:hover{background-color:#dee2e6}.btn-success{background-color:var(--success-color);color:white}.btn-success:hover{background-color:#2eb0d6}.rates-table-container{background:white;border-radius:var(--border-radius);padding:30px;box-shadow:var(--box-shadow);margin-bottom:30px}.table-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.table-title h3{font-size:1.4rem;color:var(--secondary-color);display:flex;align-items:center;gap:10px}.rates-table{width:100%;border-collapse:collapse;font-size:1rem}.rates-table th,.rates-table td{padding:15px;text-align:left;border-bottom:1px solid #eee}.rates-table th{background-color:#f8f9fa;font-weight:600;color:var(--dark-color);white-space:nowrap}.rates-table tr:hover{background-color:#f9f9f9}.currency-cell{display:flex;align-items:center;gap:10px}.rate-change{padding:4px 8px;border-radius:4px;font-size:0.85rem;font-weight:600}.rate-up{background-color:#d4edda;color:#155724}.rate-down{background-color:#f8d7da;color:#721c24}.chart-container{background:white;border-radius:var(--border-radius);padding:30px;box-shadow:var(--box-shadow);margin-bottom:30px}.chart-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;flex-wrap:wrap;gap:15px}.chart-header h3{font-size:1.4rem;color:var(--secondary-color);display:flex;align-items:center;gap:10px}.chart-controls{display:flex;gap:10px;flex-wrap:wrap}.chart-btn{padding:8px 16px;background-color:white;border:1px solid #ddd;border-radius:6px;cursor:pointer;transition:var(--transition)}.chart-btn:hover,.chart-btn.active{background-color:var(--primary-color);color:white;border-color:var(--primary-color)}.chart-placeholder{height:300px;background-color:#f8f9fa;border-radius:8px;display:flex;align-items:center;justify-content:center;color:var(--gray-color);font-size:1.1rem}.history-container{background:white;border-radius:var(--border-radius);padding:30px;box-shadow:var(--box-shadow);margin-bottom:30px}.history-form{display:flex;flex-wrap:wrap;gap:15px;margin-bottom:25px}.history-input{flex:1;min-width:200px;padding:12px 15px;border:2px solid #e0e0e0;border-radius:8px;font-size:1rem;transition:var(--transition)}.history-input:focus{outline:none;border-color:var(--primary-color)}.popular-currencies{background:white;border-radius:var(--border-radius);padding:30px;box-shadow:var(--box-shadow);margin-bottom:30px}.popular-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:15px;margin-top:20px}.currency-card{background:#f8f9fa;border-radius:8px;padding:15px;cursor:pointer;transition:var(--transition);border:2px solid transparent}.currency-card:hover{background:#e9ecef;border-color:var(--primary-color);transform:translateY(-3px)}.currency-card-header{display:flex;align-items:center;gap:10px;margin-bottom:10px}.currency-card-name{font-weight:600;color:var(--dark-color)}.currency-card-rate{font-size:1.2rem;font-weight:700;color:var(--currency-color)}.stats{display:flex;gap:15px;flex-wrap:wrap;margin-top:20px}.stat-box{background:#f8f9fa;padding:15px;border-radius:8px;flex:1;min-width:150px;text-align:center}.stat-value{font-size:1.8rem;font-weight:700;color:var(--primary-color)}.stat-label{color:var(--gray-color);font-size:0.9rem;margin-top:5px}footer{text-align:center;margin-top:40px;padding-top:20px;border-top:1px solid #e9ecef;color:var(--gray-color);font-size:0.9rem}@media (max-width:768px){.converter-form{flex-direction:column}.form-group{min-width:100%}.action-buttons{flex-direction:column}.action-btn{width:100%;justify-content:center}.table-title{flex-direction:column;align-items:flex-start;gap:15px}.rates-table{font-size:0.9rem}.rates-table th,.rates-table td{padding:10px}.chart-header{flex-direction:column;align-items:flex-start}.chart-controls{width:100%}.chart-btn{flex:1;text-align:center}.popular-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr))}}.loader{border:4px solid #f3f3f3;border-top:4px solid var(--primary-color);border-radius:50%;width:40px;height:40px;animation:spin 1s linear infinite;margin:20px auto}@keyframes spin{0%{transform:rotate(0deg)}100%{transform:rotate(360deg)}}.flag-icon{width:24px;height:18px;display:inline-block;background-size:cover;border-radius:2px;box-shadow:0 1px 3px rgba(0,0,0,0.1)}