:root{font-family:Arial,Helvetica,sans-serif;color:#25212f;background:#eeeaf6;font-synthesis:none;--purple:#6035cf;--ink:#25212f;--muted:#716b7d;--line:#ddd7e7;--paper:#fcfbfe}
*{box-sizing:border-box}body{margin:0}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #2d1581;outline-offset:4px}button:disabled{cursor:default;opacity:.45}button{touch-action:manipulation}html{scroll-behavior:smooth;scroll-padding-top:24px}.site-header{max-width:1280px;margin:auto;display:flex;align-items:center;padding:27px 48px;border-bottom:1px solid var(--line);gap:28px}.brand{display:flex;align-items:center;font-size:19px;font-weight:800;letter-spacing:-.9px;gap:9px}.brand svg{width:29px;height:29px;fill:none;stroke:var(--purple);stroke-width:2.8;stroke-linejoin:round}.brand-light{font-weight:400;margin-left:3px}.header-note{font-size:12px;color:var(--muted);flex:1}.how-link{font-size:13px}.how-link span{margin-left:14px;color:var(--purple)}main{max-width:920px;margin:auto;padding:46px 24px 0}.intro{display:flex;justify-content:space-between;align-items:center;margin-bottom:27px}.eyebrow{font-size:10px;letter-spacing:1.8px;font-weight:700;color:var(--muted);margin:0 0 11px}h1{font-size:38px;letter-spacing:-1.7px;line-height:1.1;margin:0;font-weight:600}.intro-note{color:var(--muted);font-size:13px;line-height:1.6;margin:0}.instrument{background:var(--paper);border:1px solid #d6cfe2;border-radius:12px;padding:0 14px 13px;box-shadow:0 10px 40px #3c23510a}.readout{padding:24px 20px 0}.readout-top{display:flex;justify-content:space-between;align-items:center;font-size:12px}.status{display:flex;gap:8px;align-items:center}.status i{display:inline-block;width:6px;height:6px;background:#afa7bd;border-radius:50%}.status[data-state=steady] i{background:#34816b}.status[data-state=building] i,.status[data-state=settling] i{background:var(--purple)}.status[data-state=uneven] i{background:#ab661d}.tap-count{color:var(--muted);font-size:11px}.tap-count b{font-family:ui-monospace,monospace;color:var(--ink);font-size:12px;font-weight:500}.number-line{display:flex;justify-content:center;align-items:baseline;gap:13px;height:170px;padding-top:10px}.number-line output{font-family:ui-monospace,'SFMono-Regular',Consolas,monospace;font-size:136px;line-height:1.15;letter-spacing:-11px;font-weight:500;font-variant-numeric:tabular-nums}.number-line output.long{font-size:108px;letter-spacing:-8px}.unit{font-size:13px;font-weight:700;color:var(--muted);letter-spacing:2px}.result-note{text-align:center;margin:0 0 24px;color:var(--muted);font-size:12px;min-height:15px}.rhythm-strip{display:flex;align-items:center;gap:16px;border-top:1px solid #ece7f2;padding:13px 0;color:var(--muted);font-family:ui-monospace,monospace;font-size:9px;letter-spacing:.7px}.intervals{flex:1;display:flex;gap:5px;align-items:center;height:18px;justify-content:flex-end}.intervals i{width:5px;height:4px;flex:0 1 14px;border-radius:1px;background:#e5dfed}.intervals i.measured{background:#a78bdf}.intervals i:last-child.measured{background:var(--purple)}#sample-count{white-space:nowrap}.tap-pad{position:relative;display:block;width:100%;height:205px;overflow:hidden;border:0;border-radius:6px;color:white;background:var(--purple);isolation:isolate;user-select:none;-webkit-user-select:none;transition:background .08s,transform .08s}.tap-pad:before,.tap-pad:after{content:'';position:absolute;z-index:-1;pointer-events:none;width:460px;height:460px;border-radius:50%;border:1px solid #ffffff14;right:-220px;top:-130px;box-shadow:0 0 0 38px #ffffff08,0 0 0 76px #ffffff06,0 0 0 114px #ffffff05}.tap-pad:after{width:190px;height:190px;left:-130px;top:130px;right:auto;box-shadow:0 0 0 30px #ffffff06,0 0 0 60px #ffffff04}.tap-pad:hover{background:#572cc5}.tap-pad[data-hit=true]{background:#7448e1;transform:scale(.995)}.pad-corner{position:absolute;top:21px;left:23px;font-size:9px;letter-spacing:1.8px;color:#e2d6ff}.pad-symbol{position:absolute;top:12px;right:23px;font-size:28px;color:#c8b2f8}.pad-center{display:flex;flex-direction:column;align-items:center;gap:9px}.tap-word{font-size:55px;font-weight:600;letter-spacing:5px;line-height:1.1;margin-left:5px}#tap-help{font-size:11px;color:#e5dcfa}kbd{font:inherit;border:1px solid #ffffff40;border-radius:3px;padding:2px 8px;margin-left:3px}.pad-bottom{display:flex;align-items:center;justify-content:center;gap:7px;position:absolute;left:0;right:0;bottom:18px;font-size:10px;color:#e5dcfa}.hit-dot{width:4px;height:4px;border-radius:50%;background:#d1baf8}.tap-pad[data-hit=true] .hit-dot{background:#e7ff80;box-shadow:0 0 0 3px #e7ff8022}.controls{display:flex;justify-content:space-between;align-items:center;padding:16px 6px 0;gap:12px}.speed-control{display:flex;border:1px solid var(--line);border-radius:6px;padding:3px;gap:3px}.speed-control button{border:0;background:transparent;color:#736a82;min-width:52px;min-height:44px;border-radius:3px;font-size:13px;font-weight:600}.speed-control button[aria-pressed=true]{color:var(--purple);background:#eee7fa}.actions{display:flex;gap:12px}.actions button{display:flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:0 15px;border:0;background:transparent;color:#61596e;font-size:12px;border-radius:5px}.actions button:hover:not(:disabled){background:#f0ebf8}.actions #reset span{font-size:20px;line-height:1}.actions .copy-button{border:1px solid var(--line);color:var(--ink);min-width:126px}.copy-button svg{height:15px;width:15px;stroke:currentColor;fill:none;stroke-width:1.4}.control-note{font-size:10px;color:var(--muted);text-align:left;padding:0 7px;margin:10px 0 1px;min-height:14px}.quiet-note{display:flex;align-items:center;justify-content:center;gap:6px;color:#7b7289;font-size:11px;margin:20px 0 50px}.quiet-note span{font-size:17px}.guide{display:grid;grid-template-columns:1fr 1.6fr;gap:55px;border-top:1px solid #d9d1e4;padding:32px 0 36px}.guide h2{font-weight:500;font-size:25px;line-height:1.25;letter-spacing:-.7px;margin:0}.guide-copy{font-size:12px;line-height:1.8;color:#625a70}.guide-copy>p:first-child{margin-top:0}.guide-copy>p{margin-bottom:17px}.guide-copy strong{font-weight:600;color:var(--ink)}details{border-top:1px solid #d9d1e4}summary{cursor:pointer;min-height:44px;padding:12px 23px 12px 0;color:var(--ink);position:relative;list-style:none;font-size:12px}summary::-webkit-details-marker{display:none}summary:after{content:'+';position:absolute;right:2px;top:8px;font-size:20px;color:#827590}details[open] summary:after{content:'−'}details p{margin:0 0 17px}footer{max-width:1184px;margin:auto;padding:22px 0 28px;border-top:1px solid var(--line);font-size:10px;color:var(--muted);display:flex;justify-content:space-between;gap:15px}.footer-brand{letter-spacing:.2px}.footer-brand span{margin:0 8px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}.skip-link{position:absolute;left:12px;top:-60px;z-index:5;background:white;padding:12px}.skip-link:focus{top:8px}.no-script{background:#fff3db;padding:16px;line-height:1.5}
@media(min-width:1200px){main{padding-top:48px}.tap-pad{height:215px}}
@media(max-width:700px){.site-header{padding:20px 24px}.header-note{display:none}.how-link{margin-left:auto}main{padding-top:31px}.intro-note{font-size:11px}.guide{gap:25px;grid-template-columns:1fr 1.4fr}footer{margin:0 24px}}
@media(max-width:480px){.site-header{padding:17px 20px}.brand{font-size:17px}.brand svg{width:25px}.how-link{font-size:12px}.how-link span{margin-left:6px}main{padding:25px 16px 0}.intro{margin-bottom:20px}.intro h1{font-size:30px;letter-spacing:-1.2px}.eyebrow{font-size:8px;letter-spacing:1.5px;margin-bottom:9px}.intro-note{display:none}.instrument{padding:0 10px 12px;border-radius:10px}.readout{padding:19px 10px 0}.readout-top{font-size:11px}.tap-count{font-size:10px}.number-line{height:142px;padding-top:13px;gap:10px}.number-line output{font-size:112px;letter-spacing:-8px}.number-line output.long{font-size:83px;letter-spacing:-6px}.unit{font-size:10px;letter-spacing:1px}.result-note{font-size:11px;margin-bottom:19px}.rhythm-strip{gap:10px;font-size:7px;letter-spacing:.2px;padding:12px 0}.intervals{gap:3px}.tap-pad{height:195px}.tap-word{font-size:50px}.pad-corner{font-size:8px;left:17px;top:18px}.pad-symbol{right:17px}.pad-bottom{bottom:16px}.controls{padding:12px 0 0;gap:6px}.speed-control{gap:0;padding:2px}.speed-control button{min-width:36px;min-height:40px;font-size:12px}.actions{gap:1px}.actions button{padding:0 9px;font-size:11px;gap:5px}.actions .copy-button{min-width:102px}.control-note{font-size:9px;padding:0 1px;line-height:1.5}.quiet-note{font-size:10px;margin:16px 0 32px}.guide{grid-template-columns:1fr;gap:20px;padding:26px 4px}.guide-heading h2{font-size:23px}.guide-heading h2 br{display:none}.guide-copy{font-size:12px}footer{margin:0 20px;font-size:9px;flex-direction:column;gap:9px;padding:20px 0 25px}}
@media(max-width:350px){.actions button{padding:0 6px}.actions .copy-button{min-width:94px}.speed-control button{min-width:32px}.rhythm-strip{gap:7px}.number-line output.long{font-size:72px}.quiet-note{font-size:9px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.tap-pad{transition:none}.tap-pad[data-hit=true]{transform:none}}
/* Keep the full reading and primary controls comfortable on narrow screens. */
@media(max-width:480px){.number-line output{font-size:96px;letter-spacing:-7px}.number-line output.long{font-size:76px;letter-spacing:-5px}.speed-control button{min-width:44px;min-height:44px}.actions #reset{font-size:0;min-width:44px;padding:0}.actions #reset span{font-size:22px}.actions{gap:3px}.actions .copy-button{min-width:94px;padding:0 7px}}
@media(max-width:350px){.number-line output{font-size:78px;letter-spacing:-6px}.number-line output.long{font-size:62px;letter-spacing:-4px}.controls{flex-wrap:wrap;justify-content:center;gap:8px}.control-note{text-align:center}.readout{padding-left:6px;padding-right:6px}}

.touch-hint{display:none}@media(max-width:480px),(pointer:coarse){.touch-hint{display:inline}.keyboard-hint{display:none}}
/* Supporting content follows the existing quiet, editorial rhythm. */
.how-steps{padding-left:19px;margin:0 0 23px}.how-steps li{padding:0 0 12px 3px}.how-steps li::marker{color:var(--purple);font-weight:700}.guide-copy a,.document-page a{color:#5631ad;text-decoration:underline;text-underline-offset:3px}.method-link{margin:16px 0 0}.guide h3{font-size:15px;font-weight:600;letter-spacing:-.2px;color:var(--ink);margin:0 0 9px}.guide h3:not(:first-child){margin-top:25px}.table-wrap{border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin:20px 0}.table-wrap table{border-collapse:collapse;width:100%;text-align:left;font-size:12px}.table-wrap caption{text-align:left;padding:13px 0;color:var(--ink);font-weight:600}.table-wrap th{font-size:10px;text-transform:uppercase;letter-spacing:.8px;color:var(--muted);font-weight:500}.table-wrap th,.table-wrap td{padding:10px 0;border-top:1px solid var(--line)}.table-wrap td:last-child{font-family:ui-monospace,monospace}.back-to-tool{display:inline-flex;align-items:center;gap:18px;min-height:44px;font-weight:600;font-size:13px}.guide-copy .back-to-tool,.document-page .back-to-tool{text-decoration:none}.document-page{max-width:800px;padding-top:55px;padding-bottom:40px}.document-page h1{font-size:44px;line-height:1.12;letter-spacing:-1.7px}.document-lead{font-size:17px;line-height:1.7;color:#625a70;margin:24px 0 28px}.document-page section{padding:28px 0;border-top:1px solid var(--line);scroll-margin-top:24px}.document-page h2{font-size:22px;font-weight:500;letter-spacing:-.5px;margin:0 0 16px}.document-page section p,.document-page li{font-size:14px;line-height:1.85;color:#625a70}.document-page ul{padding-left:20px}.document-page li{margin:10px 0}.document-page strong{color:var(--ink);font-weight:600}.document-page a{overflow-wrap:anywhere}.document-page .formula{font-family:ui-monospace,monospace;color:#4d2b9d;background:#e6dff1;border-left:3px solid #9273c9;padding:18px;font-size:14px}.document-page summary{font-size:14px;line-height:1.6}.page-links{display:flex;gap:8px 24px;flex-wrap:wrap;margin-bottom:26px}.page-links a{font-size:12px;min-height:44px;display:inline-flex;align-items:center}.updated-note{color:var(--muted);font-size:11px;margin-top:25px}.not-found{min-height:65vh}footer nav{display:flex;gap:18px;flex-wrap:wrap}footer nav a{min-height:44px;display:inline-flex;align-items:center}footer{align-items:center;padding-top:10px;padding-bottom:15px}.footer-brand{line-height:1.6}
@media(max-width:700px){footer{align-items:flex-start;flex-direction:column;gap:0}.document-page{padding-top:34px}.document-page h1{font-size:36px}.document-lead{font-size:15px}}
@media(max-width:480px){.document-page{padding:30px 20px}.document-page h1{font-size:33px}.document-page h2{font-size:21px}.document-page .formula{font-size:12px;padding:15px;overflow-wrap:anywhere}.page-links{gap:0 20px}.examples .guide-heading h2 br{display:block}.examples{padding-top:28px}.table-wrap th{font-size:9px}.guide-copy,.guide-copy p,.guide-copy li{font-size:13px}summary{font-size:13px}.how-steps{padding-left:20px}}