: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;--loan-color:#38b000;--interest-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}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}header{background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));color:white;padding:20px 0;box-shadow:0 4px 12px rgba(0,0,0,0.1);position:sticky;top:0;z-index:100}.header-content{display:flex;justify-content:space-between;align-items:center}.logo{display:flex;align-items:center;gap:15px}.logo i{font-size:2.5rem}.logo h1{font-size:1.8rem;font-weight:700}.logo span{color:var(--success-color)}nav ul{display:flex;list-style:none;gap:25px}nav a{color:white;text-decoration:none;font-weight:600;font-size:1.1rem;padding:8px 12px;border-radius:6px;transition:var(--transition)}nav a:hover,nav a.active{background-color:rgba(255,255,255,0.2)}.mobile-menu-btn{display:none;font-size:1.5rem;background:none;border:none;color:white;cursor:pointer}main{padding:40px 0}.tool-section{display:none;animation:fadeIn 0.5s ease}.tool-section.active{display:block}@keyframes fadeIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.section-title{font-size:1.8rem;margin-bottom:25px;color:var(--secondary-color);display:flex;align-items:center;gap:10px}.section-title i{color:var(--accent-color)}.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:25px;margin-bottom:40px}.tool-card{background:white;border-radius:var(--border-radius);padding:25px;box-shadow:var(--box-shadow);transition:var(--transition);cursor:pointer;border:2px solid transparent}.tool-card:hover{transform:translateY(-5px);border-color:var(--primary-color)}.tool-card i{font-size:2.5rem;color:var(--primary-color);margin-bottom:15px}.tool-card h3{font-size:1.4rem;margin-bottom:10px;color:var(--dark-color)}.tool-card p{color:var(--gray-color);margin-bottom:20px}.use-tool-btn{background-color:var(--primary-color);color:white;border:none;padding:10px 20px;border-radius:6px;font-weight:600;cursor:pointer;transition:var(--transition);width:100%}.use-tool-btn:hover{background-color:var(--secondary-color)}.tool-detail{background:white;border-radius:var(--border-radius);padding:30px;box-shadow:var(--box-shadow);margin-top:30px}.tool-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:25px;padding-bottom:15px;border-bottom:2px solid #f0f2f5}.tool-header h2{font-size:1.6rem;color:var(--secondary-color)}.close-tool{background:none;border:none;font-size:1.5rem;color:var(--gray-color);cursor:pointer;transition:var(--transition)}.close-tool:hover{color:var(--warning-color)}.calculator-container{display:flex;flex-direction:column;gap:20px}.calculator-row{display:flex;flex-wrap:wrap;gap:20px}.calculator-col{flex:1;min-width:300px}.calculator-col h3{margin-bottom:10px;color:var(--dark-color);font-size:1.2rem;display:flex;align-items:center;gap:8px}.input-label{color:var(--loan-color)}.result-label{color:var(--interest-color)}.input-area{border:2px solid #e0e0e0;border-radius:var(--border-radius);padding:20px;background:#f8f9fa;border-left:4px solid var(--loan-color)}.result-area{border:2px solid #e0e0e0;border-radius:var(--border-radius);padding:20px;background:#f8f9fa;border-left:4px solid var(--interest-color)}.input-group{margin-bottom:20px}.input-group label{display:block;margin-bottom:8px;font-weight:600;color:var(--dark-color)}.input-with-unit{position:relative}.input-with-unit input{width:100%;padding:12px 40px 12px 15px;border:2px solid #ddd;border-radius:6px;font-size:1rem;transition:var(--transition)}.input-with-unit input:focus{outline:none;border-color:var(--primary-color)}.unit{position:absolute;right:15px;top:50%;transform:translateY(-50%);color:var(--gray-color)}.slider-container{margin-top:10px}.slider{width:100%;height:8px;border-radius:4px;background:#ddd;outline:none;-webkit-appearance:none}.slider::-webkit-slider-thumb{-webkit-appearance:none;width:20px;height:20px;border-radius:50%;background:var(--primary-color);cursor:pointer}.slider-value{display:flex;justify-content:space-between;margin-top:5px;font-size:0.9rem;color:var(--gray-color)}.result-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:15px;margin-top:15px}.result-card{background:white;border-radius:8px;padding:20px;text-align:center;box-shadow:0 4px 12px rgba(0,0,0,0.05)}.result-card h4{font-size:0.95rem;color:var(--gray-color);margin-bottom:10px}.result-value{font-size:1.8rem;font-weight:700;color:var(--primary-color)}.result-note{font-size:0.85rem;color:var(--gray-color);margin-top:5px}.repayment-methods{display:flex;gap:15px;margin-top:15px}.method-btn{flex:1;padding:15px;border:2px solid #ddd;border-radius:8px;background:white;cursor:pointer;transition:var(--transition);text-align:center}.method-btn.active{border-color:var(--primary-color);background-color:rgba(67,97,238,0.05)}.method-btn h4{font-size:1rem;margin-bottom:5px;color:var(--dark-color)}.method-btn p{font-size:0.85rem;color:var(--gray-color)}.calculator-actions{display:flex;gap:15px;flex-wrap:wrap;margin-top:20px}.action-btn{padding:12px 24px;border-radius:6px;border:none;font-weight:600;cursor:pointer;transition:var(--transition);display:flex;align-items:center;gap:8px}.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:#3db8da}.btn-loan{background-color:var(--loan-color);color:white}.btn-loan:hover{background-color:#2d9100}.btn-interest{background-color:var(--interest-color);color:white}.btn-interest:hover{background-color:#e68a00}.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}.error-message{background-color:#ffeaea;border-left:4px solid #ff6b6b;padding:15px;border-radius:6px;margin-top:20px;display:none}.error-message.show{display:block;animation:fadeIn 0.3s ease}.error-title{color:#d63031;font-weight:600;margin-bottom:8px;display:flex;align-items:center;gap:8px}.error-content{color:#636e72;font-family:'Consolas',monospace;font-size:0.9rem;white-space:pre-wrap;word-break:break-all}.payment-table{margin-top:30px;border-radius:var(--border-radius);overflow:hidden;border:1px solid #e0e0e0;background:white}.table-header{background:#f8f9fa;padding:10px 15px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid #e0e0e0}.table-title{font-weight:600;color:var(--dark-color)}.table-content{overflow-x:auto;max-height:400px;overflow-y:auto}.payment-plan-table{width:100%;border-collapse:collapse;font-size:0.9rem}.payment-plan-table th,.payment-plan-table td{padding:12px 15px;text-align:center;border-bottom:1px solid #eee}.payment-plan-table th{background-color:#f8f9fa;font-weight:600;color:var(--dark-color);white-space:nowrap;position:sticky;top:0}.payment-plan-table tr:hover{background-color:#f9f9f9}.chart-container{margin-top:30px;border-radius:var(--border-radius);overflow:hidden;border:1px solid #e0e0e0;background:white;padding:20px}.chart-header{margin-bottom:15px;display:flex;justify-content:space-between;align-items:center}.chart-title{font-weight:600;color:var(--dark-color);font-size:1.1rem}.chart-placeholder{height:300px;display:flex;align-items:center;justify-content:center;background:#f8f9fa;border-radius:8px;color:var(--gray-color)}.examples{margin-top:30px;background:#f8f9fa;border-radius:var(--border-radius);padding:20px}.examples h3{margin-bottom:15px;color:var(--secondary-color);display:flex;align-items:center;gap:8px}.example-buttons{display:flex;gap:10px;flex-wrap:wrap}.example-btn{padding:8px 16px;background-color:white;border:1px solid #ddd;border-radius:6px;cursor:pointer;transition:var(--transition);font-size:0.9rem}.example-btn:hover{background-color:var(--primary-color);color:white;border-color:var(--primary-color)}footer{background-color:var(--dark-color);color:white;padding:40px 0;margin-top:60px}.footer-content{display:flex;flex-wrap:wrap;justify-content:space-between;gap:40px}.footer-section{flex:1;min-width:250px}.footer-section h3{font-size:1.3rem;margin-bottom:20px;color:var(--success-color)}.footer-links{list-style:none}.footer-links li{margin-bottom:10px}.footer-links a{color:#ddd;text-decoration:none;transition:var(--transition)}.footer-links a:hover{color:var(--success-color)}.copyright{text-align:center;margin-top:40px;padding-top:20px;border-top:1px solid #444;color:#aaa;font-size:0.9rem}@media (max-width:768px){.header-content{flex-direction:column;gap:20px}nav ul{flex-direction:column;gap:10px;text-align:center}.mobile-menu-btn{display:block;position:absolute;top:25px;right:20px}.mobile-menu{display:none;width:100%;margin-top:15px}.mobile-menu.show{display:block}.calculator-row{flex-direction:column}.calculator-col{min-width:100%}.calculator-actions{flex-direction:column}.action-btn{width:100%;justify-content:center}.repayment-methods{flex-direction:column}.result-cards{grid-template-columns:1fr}}