.tool-header{text-align:center;margin-bottom:40px}.header-badge{display:flex;justify-content:center;gap:12px;margin-bottom:24px;flex-wrap:wrap}.badge{background:linear-gradient(135deg, #3b82f6, #1d4ed8);color:white;padding:6px 18px;border-radius:40px;font-size:0.75rem;font-weight:500}.tool-header h1{font-size:2.2rem;font-weight:800;background:linear-gradient(135deg, #1e293b, #3b82f6);-webkit-background-clip:text;background-clip:text;color:transparent;margin-bottom:12px}.core-stats{display:flex;justify-content:center;gap:24px;margin-bottom:32px;flex-wrap:wrap}.core-stat{background:white;border-radius:60px;padding:16px 28px;display:flex;align-items:center;gap:16px;box-shadow:0 4px 15px rgba(0,0,0,0.05);border:1px solid var(--gray-200)}.core-stat-icon{width:48px;height:48px;background:linear-gradient(135deg, #e0e7ff, #f0f4ff);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#3b82f6;font-size:1.3rem}.core-stat-value{display:block;font-size:1.5rem;font-weight:700;color:var(--gray-800)}.core-stat-label{font-size:0.7rem;color:var(--gray-500)}.calc-tabs{display:flex;gap:16px;margin-bottom:24px;justify-content:center}.calc-tab{background:transparent;border:none;padding:12px 28px;cursor:pointer;transition:all 0.3s;border-radius:60px;font-weight:500}.calc-tab i{margin-right:8px}.calc-tab.active{background:linear-gradient(135deg, #3b82f6, #1d4ed8);color:white;box-shadow:0 4px 12px rgba(59,130,246,0.3)}.calc-display{background:#1a1a2e;border-radius:24px;padding:20px;margin-bottom:24px;text-align:right}.calc-expression{font-size:0.9rem;color:#a0a0c0;min-height:24px;word-break:break-all}.calc-result{font-size:2rem;font-weight:700;color:#e0e0e0;margin-top:8px;word-break:break-all}.calc-buttons{display:flex;flex-direction:column;gap:12px}.calc-row{display:flex;gap:12px}.calc-btn{flex:1;padding:16px 0;border:none;border-radius:20px;font-size:1.1rem;font-weight:500;cursor:pointer;transition:all 0.2s;background:white;color:var(--gray-700);box-shadow:0 2px 8px rgba(0,0,0,0.03);border:1px solid var(--gray-200)}.calc-btn:hover{transform:translateY(-2px);box-shadow:0 4px 12px rgba(0,0,0,0.1)}.calc-btn.number{background:#f8fafc;font-weight:600}.calc-btn.operator{background:linear-gradient(135deg, #e0e7ff, #f0f4ff);color:#3b82f6;font-weight:700}.calc-btn.clear{background:#fee2e2;color:#dc2626}.calc-btn.equal{background:linear-gradient(135deg, #3b82f6, #1d4ed8);color:white}.calc-btn.func{background:#f1f5f9;color:#3b82f6;font-size:0.9rem}.scientific-buttons .calc-row{gap:8px}.scientific-buttons .calc-btn{padding:12px 0;font-size:0.9rem}.converter-container{background:var(--gray-50);border-radius:24px;padding:24px}.converter-input-group{margin-bottom:20px}.converter-input-group label{display:block;font-weight:600;margin-bottom:8px;color:var(--gray-700)}.converter-input{width:100%;padding:14px 16px;border:1px solid var(--gray-300);border-radius:16px;font-family:monospace;font-size:1rem;background:white}.converter-input:focus{outline:none;border-color:#3b82f6}.converter-buttons{display:flex;gap:12px;margin-top:20px}.history-section{margin-top:32px;background:var(--gray-50);border-radius:24px;overflow:hidden}.history-header{display:flex;justify-content:space-between;align-items:center;padding:16px 20px;background:white;border-bottom:1px solid var(--gray-200)}.clear-history-btn{background:transparent;border:none;color:var(--gray-500);cursor:pointer;padding:4px 12px;border-radius:20px;font-size:0.75rem}.clear-history-btn:hover{background:#fee2e2;color:#dc2626}.history-list{max-height:200px;overflow-y:auto;padding:8px}.history-item{display:flex;justify-content:space-between;align-items:center;padding:10px 16px;background:white;border-radius:12px;margin-bottom:8px;font-family:monospace;font-size:0.85rem}.history-expression{color:var(--gray-600)}.history-result{font-weight:600;color:#3b82f6}.empty-history{text-align:center;padding:30px;color:var(--gray-400)}.info-section{margin-top:24px}.info-grid{display:grid;grid-template-columns:repeat(4, 1fr);gap:16px;padding:16px;background:var(--gray-50);border-radius:20px;margin-top:12px}.info-item{display:flex;align-items:center;gap:8px;font-size:0.8rem;color:var(--gray-600)}.info-item i{color:#10b981}@media (max-width:768px){.calc-row{gap:8px}.calc-btn{padding:12px 0;font-size:0.9rem}.scientific-buttons .calc-btn{padding:8px 0;font-size:0.75rem}.info-grid{grid-template-columns:repeat(2, 1fr)}.calc-tab{padding:8px 16px;font-size:0.85rem}}