/* Number Sequence Calculator */
.nseq-wrap{max-width:620px;margin:0 auto;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;color:#1a1a1a}
.nseq-header{display:flex;align-items:center;gap:12px;margin-bottom:20px}
.nseq-icon{font-size:32px;line-height:1;color:#0369A1}
.nseq-title{font-size:22px!important;font-weight:600!important;margin:0 0 3px!important;padding:0!important;border:none!important;color:#1a1a1a!important}
.nseq-sub{font-size:13px;color:#666;margin:0}
.nseq-tabs{display:flex;gap:6px;margin-bottom:18px;flex-wrap:wrap}
.nseq-tab{flex:1 1 auto;min-width:100px;padding:9px 7px;font-size:12px;font-weight:500;border:1px solid #d8d8d8;border-radius:9px;background:#fff;color:#555;cursor:pointer;transition:background .13s,color .13s,border-color .13s;display:flex;flex-direction:column;align-items:center;gap:2px;text-align:center}
.nseq-tab:hover:not(.act){background:#e0f2fe}.nseq-tab.act{background:#dbeafe;color:#0369A1;border-color:#93c5fd}
.nseq-tab span:first-child{font-size:16px}.nseq-tab-sub{font-size:10px;font-weight:400;opacity:.7}
.nseq-panel{display:none}.nseq-panel.act{display:block}
.nseq-section-lbl{font-size:11px;font-weight:700;color:#999;text-transform:uppercase;letter-spacing:.6px;margin-bottom:10px}
.nseq-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px;margin-bottom:4px}
@media(max-width:460px){.nseq-grid{grid-template-columns:1fr}}
.nseq-lbl{display:block;font-size:13px;font-weight:500;color:#555;margin-bottom:5px}
.nseq-iw input[type="number"]{width:100%;box-sizing:border-box;padding:9px 12px;border:1px solid #d0d0d0;border-radius:8px;font-size:14px;color:#1a1a1a;background:#fff;outline:none;transition:border-color .15s;-moz-appearance:textfield}
.nseq-iw input::-webkit-inner-spin-button,.nseq-iw input::-webkit-outer-spin-button{-webkit-appearance:none}
.nseq-iw input:focus{border-color:#0369A1;box-shadow:0 0 0 3px rgba(3,105,161,.1)}
.nseq-text-input{width:100%;box-sizing:border-box;padding:10px 14px;border:1px solid #d0d0d0;border-radius:8px;font-size:15px;font-family:monospace;font-weight:600;color:#1a1a1a;background:#fff;outline:none;transition:border-color .15s}
.nseq-text-input:focus{border-color:#0369A1;box-shadow:0 0 0 3px rgba(3,105,161,.1)}
.nseq-special-btns{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:4px}
.nseq-sp-btn{padding:8px 14px;font-size:13px;font-weight:500;border:1px solid #d0d0d0;border-radius:8px;background:#fff;color:#555;cursor:pointer;transition:background .13s}
.nseq-sp-btn:hover:not(.act){background:#e0f2fe}.nseq-sp-btn.act{background:#dbeafe;color:#0369A1;border-color:#0369A1;font-weight:700}
/* Result */
.nseq-result-card{background:linear-gradient(135deg,#0369A1,#0C4A6E);border-radius:12px;padding:18px 20px;color:#fff;margin-top:14px;margin-bottom:12px;animation:nseq-in .22s ease}
@keyframes nseq-in{from{opacity:0;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}
.nseq-seq-display{font-size:15px;font-family:monospace;font-weight:600;line-height:1.7;word-break:break-all;margin-bottom:10px}
.nseq-stats-row{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;border-top:1px solid rgba(255,255,255,.2);padding-top:10px}
.nseq-stat{text-align:center}.nseq-stat-val{font-size:16px;font-weight:700;font-family:monospace}.nseq-stat-lbl{font-size:11px;opacity:.7;margin-top:2px}
.nseq-formula-box{background:#f0f9ff;border:1px solid #7dd3fc;border-radius:10px;padding:12px 16px;margin-top:4px;font-size:13px;color:#0369A1;font-family:monospace}
.nseq-steps{background:#fafafa;border:1px solid #e8e8e8;border-radius:10px;overflow:hidden;margin-top:8px}
.nseq-step{display:flex;gap:10px;padding:9px 14px;border-bottom:1px solid #f0f0f0;font-size:13px}
.nseq-step:last-child{border-bottom:none}
.nseq-step-num{width:22px;height:22px;border-radius:50%;background:#0369A1;color:#fff;font-size:11px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:1px}
.nseq-step-body{flex:1;line-height:1.5;color:#555}
.nseq-detect-card{border-radius:11px;padding:14px 16px;margin-top:14px;border:1px solid}
.nseq-detect-card.found{background:#dcfce7;border-color:#86efac}.nseq-detect-card.unknown{background:#fef3c7;border-color:#fde047}
.nseq-detect-title{font-size:15px;font-weight:700;margin-bottom:8px}.nseq-detect-card.found .nseq-detect-title{color:#166534}.nseq-detect-card.unknown .nseq-detect-title{color:#92400E}
.nseq-detect-row{display:flex;justify-content:space-between;padding:5px 0;font-size:13px;border-bottom:1px solid rgba(0,0,0,.06)}.nseq-detect-row:last-child{border-bottom:none}