.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, #8b5cf6, #7c3aed);color:white;padding:6px 18px;border-radius:40px;font-size:0.75rem;font-weight:500;box-shadow:0 2px 8px rgba(0,0,0,0.1)}.tool-header h1{font-size:2.2rem;font-weight:800;background:linear-gradient(135deg, #1e293b, #7c3aed);-webkit-background-clip:text;background-clip:text;color:transparent;margin-bottom:12px}.tool-header p{color:var(--gray-500);font-size:1rem}.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, #ede9fe, #f5f3ff);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#7c3aed;font-size:1.3rem}.core-stat-info{text-align:left}.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)}.input-card{background:linear-gradient(135deg, #fff, #f8fafc);border-radius:28px;padding:24px;margin-bottom:32px;border:1px solid var(--gray-200)}.input-header{display:flex;align-items:center;gap:8px;margin-bottom:20px;font-weight:600;color:var(--gray-700)}.input-wrapper{display:flex;align-items:center;gap:12px;background:white;border-radius:60px;padding:6px 6px 6px 20px;border:1px solid var(--gray-200);transition:all 0.3s}.input-wrapper:focus-within{border-color:#7c3aed;box-shadow:0 0 0 3px rgba(124,58,237,0.1)}.input-icon{color:#7c3aed;font-size:1.1rem}.number-input{flex:1;border:none;padding:14px 0;font-size:1rem;background:transparent;font-family:'Fira Code',monospace}.number-input:focus{outline:none}.calc-btn{background:linear-gradient(135deg, #8b5cf6, #7c3aed);border:none;padding:12px 28px;border-radius:60px;color:white;font-weight:600;cursor:pointer;transition:all 0.3s}.calc-btn:hover{transform:translateY(-2px);box-shadow:0 10px 25px rgba(124,58,237,0.4)}.bit-selector{margin-top:20px;display:flex;align-items:center;gap:16px;flex-wrap:wrap}.bit-selector label{font-weight:500;color:var(--gray-600)}.bit-buttons{display:flex;gap:12px}.bit-btn{background:var(--gray-100);border:1px solid var(--gray-200);padding:8px 24px;border-radius:40px;cursor:pointer;transition:all 0.2s;font-weight:500}.bit-btn.active{background:linear-gradient(135deg, #8b5cf6, #7c3aed);color:white;border-color:transparent}.result-cards{display:grid;grid-template-columns:repeat(3, 1fr);gap:24px;margin-bottom:32px}.result-card{background:white;border-radius:24px;overflow:hidden;border:1px solid var(--gray-200);transition:all 0.3s}.result-card:hover{transform:translateY(-4px);box-shadow:0 15px 35px -12px rgba(0,0,0,0.1)}.result-card.sign-magnitude{border-top:4px solid #f59e0b}.result-card.ones-complement{border-top:4px solid #10b981}.result-card.twos-complement{border-top:4px solid #7c3aed}.card-header{padding:16px 20px;display:flex;align-items:center;gap:10px;background:var(--gray-50);border-bottom:1px solid var(--gray-200)}.card-icon{width:36px;height:36px;border-radius:12px;display:flex;align-items:center;justify-content:center}.sign-magnitude .card-icon{background:#fef3c7;color:#f59e0b}.ones-complement .card-icon{background:#d1fae5;color:#10b981}.twos-complement .card-icon{background:#ede9fe;color:#7c3aed}.card-title{font-weight:600;color:var(--gray-800);font-size:1rem}.card-badge{font-size:0.6rem;color:var(--gray-500);background:var(--gray-100);padding:2px 8px;border-radius:20px;margin-left:auto}.card-content{padding:20px;text-align:center}.binary-display{font-family:'Fira Code',monospace;font-size:1rem;font-weight:600;color:var(--gray-800);background:var(--gray-100);padding:12px;border-radius:12px;word-break:break-all;margin-bottom:12px}.binary-info{font-size:0.7rem;color:var(--gray-500)}.card-actions{padding:12px 20px;border-top:1px solid var(--gray-200);text-align:center}.copy-btn{background:transparent;border:1px solid var(--gray-300);padding:6px 16px;border-radius:30px;cursor:pointer;font-size:0.75rem;transition:all 0.2s}.copy-btn:hover{background:var(--gray-100);color:#7c3aed}.convert-section{background:var(--gray-50);border-radius:24px;padding:20px;margin-bottom:24px}.convert-header{display:flex;align-items:center;gap:8px;margin-bottom:16px;font-weight:600;color:var(--gray-700)}.convert-grid{display:grid;grid-template-columns:repeat(3, 1fr);gap:16px}.convert-item{background:white;border-radius:16px;padding:16px;text-align:center;position:relative}.convert-item label{display:block;font-size:0.7rem;color:var(--gray-500);margin-bottom:8px}.convert-value{font-family:'Fira Code',monospace;font-size:1rem;font-weight:600;color:#7c3aed;word-break:break-all}.copy-convert{position:absolute;top:12px;right:12px;background:transparent;border:none;color:var(--gray-400);cursor:pointer;padding:4px}.copy-convert:hover{color:#7c3aed}.explain-section{background:linear-gradient(135deg, #f0f9ff, #e0f2fe);border-radius:24px;padding:20px;margin-bottom:24px}.explain-header{display:flex;align-items:center;gap:8px;margin-bottom:12px;font-weight:600;color:#0369a1}.explain-content{font-size:0.85rem;line-height:1.6;color:#0c4a6e}.knowledge-section{background:var(--gray-50);border-radius:24px;padding:20px}.knowledge-header{display:flex;align-items:center;gap:8px;margin-bottom:16px;font-weight:600;color:var(--gray-700)}.knowledge-grid{display:grid;grid-template-columns:repeat(4, 1fr);gap:16px}.knowledge-card{background:white;border-radius:16px;padding:16px;transition:all 0.2s}.knowledge-card:hover{transform:translateY(-2px);box-shadow:0 4px 12px rgba(0,0,0,0.05)}.knowledge-card h4{display:flex;align-items:center;gap:6px;font-size:0.9rem;margin-bottom:10px;color:#7c3aed}.knowledge-card p{font-size:0.75rem;color:var(--gray-600);line-height:1.5}@media (max-width:1024px){.result-cards{grid-template-columns:1fr}.knowledge-grid{grid-template-columns:repeat(2, 1fr)}.convert-grid{grid-template-columns:1fr}}@media (max-width:768px){.input-wrapper{flex-direction:column;border-radius:30px;padding:16px}.calc-btn{width:100%}.knowledge-grid{grid-template-columns:1fr}.core-stats{gap:12px}.core-stat{padding:12px 20px}.bit-buttons{flex-wrap:wrap}}