.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, #dc2626, #b91c1c);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, #dc2626);-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, #fee2e2, #fef2f2);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#dc2626;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)}.mode-tabs{display:flex;gap:16px;margin-bottom:32px;justify-content:center}.mode-tab{background:transparent;border:none;padding:14px 28px;cursor:pointer;transition:all 0.3s;border-radius:20px;text-align:center;min-width:160px}.mode-tab i{font-size:1.3rem;color:var(--gray-400);margin-bottom:8px;display:block}.mode-tab span{display:block;font-weight:600;color:var(--gray-600);margin-bottom:4px}.mode-tab small{font-size:0.65rem;color:var(--gray-400)}.mode-tab.active{background:linear-gradient(135deg, #dc2626, #b91c1c);box-shadow:0 8px 25px rgba(220,38,38,0.3)}.mode-tab.active i,.mode-tab.active span,.mode-tab.active small{color:white}.input-card{background:linear-gradient(135deg, #fff, #f8fafc);border-radius:24px;padding:24px;margin-bottom:24px;border:1px solid var(--gray-200)}.input-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;font-weight:600;color:var(--gray-700)}.char-count{font-size:0.7rem;font-weight:normal;color:var(--gray-400);background:var(--gray-100);padding:2px 8px;border-radius:20px}.encode-textarea,.decode-textarea{width:100%;min-height:150px;padding:16px;border:1px solid var(--gray-200);border-radius:16px;font-family:'Fira Code',monospace;font-size:0.9rem;line-height:1.6;resize:vertical;margin-bottom:20px}.encode-textarea:focus,.decode-textarea:focus{outline:none;border-color:#dc2626;box-shadow:0 0 0 3px rgba(220,38,38,0.1)}.convert-btn{width:100%;padding:12px;font-size:1rem;background:linear-gradient(135deg, #dc2626, #b91c1c)}.result-card{background:#1a1a2e;border-radius:24px;overflow:hidden;margin-bottom:24px;animation:fadeIn 0.3s ease}.result-header{display:flex;justify-content:space-between;align-items:center;padding:16px 20px;background:#2d2d44;color:white}.result-content{padding:20px;font-family:'Fira Code',monospace;font-size:1rem;line-height:1.8;color:#e0e0e0;word-break:break-all}.result-details{padding:16px 20px;background:#2d2d44;border-top:1px solid rgba(255,255,255,0.05);font-size:0.8rem;color:#a0a0c0}.copy-btn{background:rgba(255,255,255,0.1);border:none;padding:6px 16px;border-radius:30px;color:white;cursor:pointer;transition:all 0.2s}.copy-btn:hover{background:#dc2626}.range-search{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:24px}.search-card{background:var(--gray-50);border-radius:20px;padding:20px}.search-card label{display:block;font-weight:600;margin-bottom:12px;color:var(--gray-700)}.search-input-group{display:flex;gap:12px}.search-input{flex:1;padding:12px 16px;border:1px solid var(--gray-200);border-radius:40px;font-size:0.9rem}.search-btn{background:#dc2626;color:white;border:none;padding:12px 24px;border-radius:40px;cursor:pointer;transition:all 0.2s}.search-btn:hover{background:#b91c1c}.range-result{background:var(--gray-50);border-radius:20px;overflow:hidden;margin-bottom:24px}.range-content{padding:20px;font-family:monospace}.range-table{background:white;border-radius:20px;overflow:hidden;border:1px solid var(--gray-200)}.range-table h4{padding:16px 20px;background:var(--gray-50);border-bottom:1px solid var(--gray-200);margin:0}.table-wrapper{overflow-x:auto;padding:16px}.range-table-content{width:100%;border-collapse:collapse}.range-table-content th,.range-table-content td{padding:12px;text-align:left;border-bottom:1px solid var(--gray-200)}.range-table-content th{background:var(--gray-100);font-weight:600}.quick-examples{margin-top:24px}.divider{display:flex;align-items:center;gap:12px;margin-bottom:16px}.divider span{font-size:0.85rem;font-weight:500;color:var(--gray-600)}.divider::after{content:'';flex:1;height:1px;background:var(--gray-200)}.example-buttons{display:flex;flex-wrap:wrap;gap:12px}.example-btn{background:var(--gray-100);border:1px solid var(--gray-200);padding:8px 20px;border-radius:40px;cursor:pointer;transition:all 0.2s;font-size:0.85rem}.example-btn:hover{background:#dc2626;border-color:#dc2626;color:white}.knowledge-section{margin-top:32px;background:linear-gradient(135deg, #fef2f2, #fff5f5);border-radius:28px;padding:24px}.knowledge-header{display:flex;align-items:center;gap:10px;margin-bottom:20px;font-weight:600;color:#991b1b}.knowledge-grid{display:grid;grid-template-columns:repeat(4, 1fr);gap:20px}.knowledge-card{background:white;border-radius:20px;padding:20px;text-align:center;transition:all 0.3s}.knowledge-card:hover{transform:translateY(-4px);box-shadow:0 10px 25px rgba(0,0,0,0.08)}.knowledge-card i{font-size:1.8rem;color:#dc2626;margin-bottom:12px}.knowledge-card h4{font-size:0.9rem;margin-bottom:8px}.knowledge-card p{font-size:0.7rem;color:var(--gray-500)}@keyframes fadeIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@media (max-width:900px){.range-search{grid-template-columns:1fr}.knowledge-grid{grid-template-columns:repeat(2, 1fr)}}@media (max-width:768px){.mode-tab{min-width:auto;padding:10px 16px}.mode-tab i{font-size:1rem}.mode-tab small{display:none}.knowledge-grid{grid-template-columns:1fr}.core-stat{padding:12px 20px}.core-stat-value{font-size:1.2rem}}