.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, #6d28d9);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, #8b5cf6);-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, #ede9fe, #f5f3ff);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#8b5cf6;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)}.input-section{display:flex;align-items:center;justify-content:center;gap:20px;margin-bottom:24px;flex-wrap:wrap}.input-card{background:linear-gradient(135deg, #fff, #f8fafc);border-radius:24px;padding:20px;flex:1;min-width:250px;border:1px solid var(--gray-200)}.input-label{display:flex;align-items:baseline;gap:12px;margin-bottom:12px;font-weight:600;color:var(--gray-700)}.label-hint{font-size:0.65rem;font-weight:normal;color:var(--gray-400)}.hex-input{width:100%;padding:14px 16px;font-family:'Fira Code',monospace;font-size:1.1rem;border:2px solid var(--gray-200);border-radius:16px;background:white;transition:all 0.3s;letter-spacing:0.5px}.hex-input:focus{outline:none;border-color:#8b5cf6;box-shadow:0 0 0 3px rgba(139,92,246,0.1)}.input-actions{display:flex;gap:8px;margin-top:12px}.input-action{background:transparent;border:1px solid var(--gray-200);padding:6px 12px;border-radius:30px;cursor:pointer;font-size:0.7rem;transition:all 0.2s;color:var(--gray-500)}.input-action:hover{background:#8b5cf6;border-color:#8b5cf6;color:white}.operator-selector{background:linear-gradient(135deg, #f8fafc, #fff);border-radius:24px;padding:16px;border:1px solid var(--gray-200)}.operator-grid{display:grid;grid-template-columns:repeat(5, 1fr);gap:10px}.op-btn{background:white;border:1px solid var(--gray-200);padding:12px 8px;border-radius:16px;cursor:pointer;transition:all 0.2s;font-weight:500;font-size:0.85rem;display:flex;align-items:center;justify-content:center;gap:6px}.op-btn i{font-size:0.8rem}.op-btn:hover{background:#8b5cf6;border-color:#8b5cf6;color:white}.op-btn.active{background:#8b5cf6;border-color:#8b5cf6;color:white;box-shadow:0 4px 12px rgba(139,92,246,0.3)}.bitwidth-section{display:flex;align-items:center;gap:20px;margin-bottom:24px;padding:16px;background:var(--gray-50);border-radius:20px;flex-wrap:wrap}.bitwidth-buttons{display:flex;gap:10px}.bitwidth-btn{background:white;border:1px solid var(--gray-200);padding:8px 20px;border-radius:40px;cursor:pointer;transition:all 0.2s;font-weight:500}.bitwidth-btn.active{background:#8b5cf6;border-color:#8b5cf6;color:white}.signed-checkbox{display:flex;align-items:center;gap:8px;cursor:pointer}.result-section{margin-bottom:24px}.result-card{background:linear-gradient(135deg, #ede9fe, #f5f3ff);border-radius:24px;padding:24px;margin-bottom:20px;border:1px solid #c4b5fd}.result-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.result-header span{font-weight:600;color:#6d28d9}.result-action{background:transparent;border:1px solid #c4b5fd;padding:6px 14px;border-radius:30px;cursor:pointer;font-size:0.7rem;transition:all 0.2s;color:#6d28d9}.result-action:hover{background:#8b5cf6;border-color:#8b5cf6;color:white}.result-value{font-family:'Fira Code',monospace;font-size:2rem;font-weight:700;color:#6d28d9;word-break:break-all;text-align:center}.conversion-grid{display:grid;grid-template-columns:repeat(4, 1fr);gap:16px}.conversion-card{background:white;border-radius:20px;padding:16px;display:flex;align-items:center;gap:14px;border:1px solid var(--gray-200);transition:all 0.3s}.conversion-card:hover{transform:translateY(-2px);box-shadow:0 8px 20px rgba(0,0,0,0.08)}.conversion-icon{width:44px;height:44px;background:linear-gradient(135deg, #ede9fe, #f5f3ff);border-radius:14px;display:flex;align-items:center;justify-content:center;color:#8b5cf6;font-size:1.2rem}.conversion-info{flex:1}.conversion-label{display:block;font-size:0.65rem;color:var(--gray-500);margin-bottom:4px}.conversion-value{display:block;font-family:'Fira Code',monospace;font-size:0.85rem;font-weight:500;color:var(--gray-800);word-break:break-all}.history-section{background:var(--gray-50);border-radius:20px;padding:16px;margin-bottom:24px}.history-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;padding-bottom:8px;border-bottom:1px solid var(--gray-200)}.clear-history{background:transparent;border:none;color:var(--gray-500);cursor:pointer;font-size:0.7rem}.clear-history:hover{color:#ef4444}.history-list{max-height:200px;overflow-y:auto}.history-item{display:flex;justify-content:space-between;align-items:center;padding:10px 12px;background:white;border-radius:12px;margin-bottom:8px;font-family:'Fira Code',monospace;font-size:0.8rem;cursor:pointer;transition:all 0.2s}.history-item:hover{background:#8b5cf6;color:white;transform:translateX(4px)}.empty-history{text-align:center;padding:30px;color:var(--gray-400)}.reference-section{margin-top:20px}.ref-table{display:grid;grid-template-columns:repeat(8, 1fr);gap:8px;margin-top:16px}.ref-row{background:var(--gray-50);border-radius:12px;padding:8px;text-align:center;font-family:'Fira Code',monospace;font-size:0.75rem;display:flex;flex-direction:column;gap:4px}.ref-hex{color:#8b5cf6;font-weight:600}.ref-dec{color:var(--gray-600)}.ref-bin{color:var(--gray-400);font-size:0.65rem}@media (max-width:900px){.conversion-grid{grid-template-columns:repeat(2, 1fr)}.operator-grid{grid-template-columns:repeat(3, 1fr)}.ref-table{grid-template-columns:repeat(4, 1fr)}}@media (max-width:768px){.input-section{flex-direction:column}.input-card{width:100%}.conversion-grid{grid-template-columns:1fr}.operator-grid{grid-template-columns:repeat(2, 1fr)}.ref-table{grid-template-columns:repeat(2, 1fr)}}