/* Permutation & Combination Calculator */
.pncalc-wrap{max-width:580px;margin:0 auto;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;color:#1a1a1a}
.pncalc-header{display:flex;align-items:center;gap:12px;margin-bottom:20px}
.pncalc-icon{width:46px;height:46px;border-radius:12px;background:linear-gradient(135deg,#7C3AED,#5B21B6);color:#fff;font-size:24px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.pncalc-title{font-size:20px!important;font-weight:600!important;margin:0 0 3px!important;padding:0!important;border:none!important;color:#1a1a1a!important}
.pncalc-sub{font-size:13px;color:#666;margin:0}
.pncalc-tabs{display:flex;gap:6px;margin-bottom:18px;flex-wrap:wrap}
.pncalc-tab{flex:1 1 auto;min-width:110px;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}
.pncalc-tab span:first-child{font-size:15px;font-weight:700;font-family:serif}
.pncalc-tab-sub{font-size:10px;font-weight:400;opacity:.65}
.pncalc-tab:hover:not(.act){background:#f5f3ff}.pncalc-tab.act{background:#f3e8ff;color:#6B21A8;border-color:#c4b5fd}
.pncalc-panel{display:none}.pncalc-panel.act{display:block}
.pncalc-section-lbl{font-size:11px;font-weight:700;color:#999;text-transform:uppercase;letter-spacing:.6px;margin-bottom:8px}
.pncalc-formula-box{font-size:20px;font-family:serif;text-align:center;padding:14px;background:#f3e8ff;border-radius:10px;margin-bottom:14px;color:#5B21B6;font-weight:600}
.pncalc-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:10px}
.pncalc-lbl{display:flex;align-items:center;gap:5px;font-size:13px;font-weight:500;color:#555;margin-bottom:5px}
.pncalc-tip{display:inline-flex;align-items:center;justify-content:center;width:14px;height:14px;border-radius:50%;background:#ebebeb;font-size:9px;color:#777;cursor:help;font-style:normal}
.pncalc-iw input{width:100%;box-sizing:border-box;padding:10px 12px;border:1px solid #d0d0d0;border-radius:8px;font-size:18px;font-weight:700;color:#1a1a1a;background:#fff;outline:none;transition:border-color .15s;-moz-appearance:textfield;text-align:center}
.pncalc-iw input::-webkit-inner-spin-button,.pncalc-iw input::-webkit-outer-spin-button{-webkit-appearance:none}
.pncalc-iw input:focus{border-color:#7C3AED;box-shadow:0 0 0 3px rgba(124,58,237,.1)}
.pncalc-quick-row{display:flex;align-items:center;gap:7px;flex-wrap:wrap;margin-bottom:12px}
.pncalc-ql{font-size:12px;color:#888}
.pncalc-qbtn{padding:5px 10px;font-size:12.5px;font-family:monospace;border:1px solid #d0d0d0;border-radius:7px;background:#fff;color:#555;cursor:pointer;transition:background .13s}
.pncalc-qbtn:hover{background:#f3e8ff;border-color:#c4b5fd;color:#6B21A8}
/* Result card */
.pncalc-result-card{background:linear-gradient(135deg,#7C3AED,#5B21B6);border-radius:12px;padding:18px 22px;color:#fff;text-align:center;margin-top:4px;margin-bottom:12px;animation:pnc-in .22s ease}
@keyframes pnc-in{from{opacity:0;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}
.pncalc-main-val{font-size:42px;font-weight:700;font-family:monospace;margin-bottom:4px;word-break:break-all}
.pncalc-main-expr{font-size:14px;opacity:.8;margin-bottom:8px;font-family:monospace}
.pncalc-extras{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;border-top:1px solid rgba(255,255,255,.2);padding-top:10px}
.pncalc-extra{text-align:center}.pncalc-extra-val{font-size:14px;font-weight:600;font-family:monospace}.pncalc-extra-lbl{font-size:11px;opacity:.65;margin-top:2px}
/* Steps */
.pncalc-steps{background:#fafafa;border:1px solid #e8e8e8;border-radius:10px;overflow:hidden;margin-bottom:14px}
.pncalc-step{display:flex;gap:10px;padding:9px 14px;border-bottom:1px solid #f0f0f0;font-size:13px}
.pncalc-step:last-child{border-bottom:none}
.pncalc-step-num{width:22px;height:22px;border-radius:50%;background:#7C3AED;color:#fff;font-size:11px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:1px}
.pncalc-step-body{flex:1;color:#555;font-family:monospace;font-size:12px;line-height:1.6}
/* Pascal triangle */
.pncalc-pascal-wrap{overflow-x:auto;margin-bottom:14px}
.pncalc-pascal-row{display:flex;justify-content:center;gap:4px;margin-bottom:4px}
.pncalc-pascal-cell{min-width:36px;height:32px;border-radius:6px;background:#f3e8ff;border:1px solid #c4b5fd;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;color:#5B21B6;font-family:monospace;cursor:default;transition:background .13s}
.pncalc-pascal-cell:hover{background:#7C3AED;color:#fff}
.pncalc-pascal-legend{font-size:11px;color:#888;text-align:center;margin-top:6px}
/* Factorial result */
.pncalc-fac-result{background:#f3e8ff;border:1px solid #c4b5fd;border-radius:11px;padding:14px 16px;margin-top:8px;animation:pnc-in .22s ease}
.pncalc-fac-val{font-size:18px;font-weight:700;color:#5B21B6;font-family:monospace;word-break:break-all;margin-bottom:8px;line-height:1.4}
.pncalc-fac-row{display:flex;justify-content:space-between;font-size:13px;padding:4px 0;border-bottom:1px solid #e9d5ff}.pncalc-fac-row:last-child{border-bottom:none}
.pncalc-fac-lbl{color:#555}.pncalc-fac-rval{font-weight:600;color:#5B21B6;font-family:monospace}