:root{--bg:#f5f5f1;--surface:#fff;--surface-soft:#edf4f1;--ink:#17211f;--muted:#5c6a66;--line:#d9e0dc;--accent:#17695b;--accent-dark:#0f5045;--accent-light:#d8eee8;--warning:#7b4b13;--warning-bg:#fff5dd;--radius:14px;--shadow:0 12px 35px #172e2812;color:var(--ink);background:var(--bg);font-synthesis:none;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--bg);min-width:320px;margin:0;line-height:1.65}a{color:var(--accent-dark);text-underline-offset:.18em}a:hover{color:var(--accent)}button,input,select{font:inherit}button,summary,input[type=range]{touch-action:manipulation}:focus-visible{outline-offset:3px;outline:3px solid #e6a431}.skip-link{z-index:100;background:var(--ink);color:#fff;padding:.65rem 1rem;position:fixed;top:8px;left:8px;transform:translateY(-160%)}.skip-link:focus{transform:none}.site-header{border-bottom:1px solid var(--line);z-index:20;background:#fffffff0;height:66px;position:relative}.header-inner{justify-content:space-between;align-items:center;gap:2rem;max-width:1220px;height:100%;margin:auto;padding:0 24px;display:flex}.brand{color:var(--ink);white-space:nowrap;align-items:center;gap:.65rem;font-weight:750;text-decoration:none;display:inline-flex}.brand-mark{width:36px;height:36px;color:var(--accent);flex:none}.desktop-nav{align-items:center;gap:.2rem;font-size:.92rem;display:flex}.desktop-nav>a,.desktop-nav summary{color:#31403c;cursor:pointer;border-radius:8px;align-items:center;gap:.2rem;padding:.55rem .7rem;text-decoration:none;list-style:none;display:flex}.desktop-nav>a:hover,.desktop-nav summary:hover{background:var(--surface-soft);color:var(--ink)}.desktop-nav>a[aria-current=page],.desktop-nav details.nav-group-current>summary,.nav-menu a[aria-current=page],.mobile-nav nav a[aria-current=page]{background:var(--accent-light);color:var(--accent-dark);font-weight:750}.desktop-nav details{position:relative}.desktop-nav summary::-webkit-details-marker,.mobile-nav summary::-webkit-details-marker{display:none}.nav-menu{border:1px solid var(--line);width:200px;box-shadow:var(--shadow);background:#fff;border-radius:10px;padding:.5rem;display:grid;position:absolute;top:calc(100% + 8px);right:0}.nav-menu a{color:var(--ink);border-radius:7px;padding:.55rem .65rem;text-decoration:none}.nav-menu a:hover{background:var(--surface-soft)}.mobile-nav{display:none;position:relative}.mobile-nav>summary{border:1px solid var(--line);cursor:pointer;border-radius:9px;place-items:center;width:44px;height:44px;list-style:none;display:grid}.mobile-nav nav{border:1px solid var(--line);width:min(300px,100vw - 32px);box-shadow:var(--shadow);background:#fff;border-radius:12px;padding:.6rem;display:grid;position:absolute;top:50px;right:0}.mobile-nav nav a{color:var(--ink);border-radius:8px;padding:.7rem;text-decoration:none}.mobile-nav nav a:hover{background:var(--surface-soft)}main{min-height:65vh}.page-shell{max-width:1180px;margin:0 auto;padding:18px 24px 96px}.breadcrumbs{max-width:1180px;color:var(--muted);margin:0 auto;font-size:.84rem}.breadcrumbs ol{gap:.55rem;margin:0 0 12px;padding:0;list-style:none;display:flex}.breadcrumbs li+li:before{content:"/";color:#96a29f;margin-right:.55rem}.breadcrumbs a{color:inherit}.article-intro{text-align:center;max-width:800px;margin:38px auto 54px}.eyebrow{color:var(--accent);text-transform:uppercase;letter-spacing:.11em;margin:0 0 .45rem;font-size:.76rem;font-weight:780}h1{letter-spacing:-.045em;margin:0 0 1rem;font-size:clamp(2rem,5vw,3.5rem);line-height:1.08}.article-intro>p:last-child{color:var(--muted);margin:0 auto;font-size:1.08rem}h2{letter-spacing:-.025em;line-height:1.18}h3{line-height:1.3}.content-section{max-width:1020px;margin:76px auto}.section-heading{text-align:center;max-width:700px;margin:0 auto 30px}.section-heading h2{margin:.15rem 0 .75rem;font-size:clamp(1.65rem,3vw,2.25rem)}.section-heading>p:last-child{color:var(--muted)}.prose-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;display:grid}.prose-block{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:28px}.prose-block h2{margin-top:0;font-size:1.45rem}.prose-block p:last-child{margin-bottom:0}.wide-block{grid-column:1/-1}.card-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;display:grid}.info-card,.related-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px}.info-card h3,.related-card h3{margin:0 0 .6rem}.info-card p{color:#43514d;margin-bottom:0}.related-card{color:var(--ink);text-decoration:none;transition:transform .2s,border-color .2s;display:block}.related-card:hover{color:var(--ink);border-color:#9bb8b0;transform:translateY(-2px)}.related-card p{color:var(--muted)}.related-card span{color:var(--accent);font-weight:700}.step-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;display:grid}.step-card{background:var(--surface);border:1px solid var(--line);border-top:3px solid var(--accent);border-radius:var(--radius);padding:28px}.step-number{color:var(--accent);font-variant-numeric:tabular-nums;font-weight:800}.step-card h3{margin:.65rem 0 .5rem}.step-card p{color:var(--muted);margin:0}.faq-list{gap:10px;max-width:800px;margin:auto;display:grid}.faq-list details{border:1px solid var(--line);background:#fff;border-radius:11px}.faq-list summary{cursor:pointer;align-items:center;min-height:52px;padding:.85rem 1.15rem;font-weight:700;display:flex}.faq-list p{color:var(--muted);margin:0;padding:0 1.15rem 1.1rem}.disclaimer-callout{background:var(--surface-soft);border-radius:var(--radius);border:1px solid #c7ddd7;align-items:flex-start;gap:16px;max-width:940px;margin:70px auto;padding:24px;display:flex}.disclaimer-callout svg{color:var(--accent);flex:none;margin-top:3px}.disclaimer-callout h2{margin:0 0 .4rem;font-size:1.15rem}.disclaimer-callout p{color:#3d4d48;margin:0}.site-footer{border-top:1px solid var(--line);background:#e9eeeb}.footer-inner{grid-template-columns:1.3fr repeat(5,1fr);gap:24px;max-width:1180px;margin:auto;padding:54px 24px;display:grid}.footer-inner h2{text-transform:uppercase;letter-spacing:.08em;margin:0 0 .8rem;font-size:.83rem}.footer-inner>div:not(.footer-about){flex-direction:column;gap:.38rem;display:flex}.footer-inner a{color:#34443f;font-size:.91rem;text-decoration:none}.footer-about p{max-width:340px;color:var(--muted);font-size:.9rem}.legal-page{max-width:820px;margin:0 auto;padding:50px 24px 100px}.legal-page h1{font-size:clamp(2.1rem,5vw,3.25rem)}.legal-page h2{margin-top:2.2rem}.legal-page .lead{color:var(--muted);font-size:1.08rem}.tool-card{background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:16px;display:block;overflow:hidden}.tool-card-header{border-bottom:1px solid var(--line);background:#fbfcfb;justify-content:space-between;align-items:center;gap:1rem;min-height:48px;padding:10px 18px;display:flex}.tool-card-header>div{align-items:center;gap:.7rem;display:flex}.tool-kicker{align-items:center;gap:.4rem;font-size:.84rem;font-weight:760;display:inline-flex}.tool-kicker svg{color:var(--accent)}.local-badge{background:var(--accent-light);color:var(--accent-dark);border-radius:999px;padding:.12rem .48rem;font-size:.7rem;font-weight:750}.tool-status{color:var(--muted);text-align:right;margin:0;font-size:.82rem}.single-tool,.sweep-tool,.multi-tool,.guided-tool,.subwoofer-tool,.dual-tool,.dtmf-tool,.noise-tool,.phase1-noise-tool,.binaural-tool,.tone528-tool,.tuning-tool,.metronome-tool,.hearing-tool,.solfeggio-tool,.dog-whistle-tool,.time-stretcher-tool{padding:20px}.primary-frequency{grid-template-columns:125px minmax(140px,210px) 1fr;align-items:center;gap:12px 16px;padding-bottom:18px;display:grid}.primary-frequency>label{font-size:.82rem;font-weight:740}.number-unit{align-items:stretch;min-width:0;display:flex}.number-unit input{font-variant-numeric:tabular-nums;border:1px solid #bfcac6;border-right:0;border-radius:8px 0 0 8px;width:100%;min-width:0;padding:.56rem .7rem;font-weight:750}.number-unit span{color:var(--muted);background:#eef1ef;border:1px solid #bfcac6;border-radius:0 8px 8px 0;place-items:center;padding:0 .65rem;font-size:.82rem;display:grid}.frequency-slider{width:100%;accent-color:var(--accent)}.primary-frequency .compact-row{grid-column:2/-1}.button-row,.preset-row,.action-row{flex-wrap:wrap;gap:8px;display:flex}button{min-height:40px;color:var(--ink);cursor:pointer;background:#fff;border:1px solid #bec9c5;border-radius:8px;padding:.48rem .78rem;font-weight:680}button:hover:not(:disabled){border-color:var(--accent);background:var(--surface-soft)}button:disabled{cursor:not-allowed;opacity:.47}.compact-row button{align-items:center;gap:.25rem;min-height:34px;padding:.3rem .58rem;font-size:.78rem;display:inline-flex}.control-grid{border-top:1px solid #edf0ee;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;padding:16px 0;display:grid}.control-field{flex-direction:column;gap:6px;min-width:0;display:flex}.control-field>span,.control-field>label,.guided-footer label{color:#40504c;font-size:.78rem;font-weight:740}.control-field output,.guided-footer output{float:right;color:var(--accent);font-variant-numeric:tabular-nums}.control-field select,.control-field>input:not([type=range]){width:100%;min-height:42px;color:var(--ink);background:#fff;border:1px solid #bfcac6;border-radius:8px;padding:.45rem .6rem}.control-field input[type=range],.guided-footer input[type=range]{width:100%;accent-color:var(--accent)}.check-field{align-self:end;align-items:center;gap:.5rem;min-height:42px;font-size:.87rem;display:flex}.check-field input{width:18px;height:18px;accent-color:var(--accent)}.preset-area{border-top:1px solid #edf0ee;padding:13px 0}.preset-area>span{color:var(--muted);margin-bottom:8px;font-size:.76rem;font-weight:740;display:block}.preset-row button{min-height:34px;padding:.32rem .62rem;font-size:.78rem}.visualizer-panel{grid-template-columns:minmax(0,1.7fr) minmax(260px,1fr);gap:14px;margin-top:10px;display:grid}.visualizer-panel canvas{background:#101b19;border-radius:10px;width:100%;height:160px;display:block}.signal-info{background:var(--line);border:1px solid var(--line);border-radius:10px;grid-template-columns:repeat(2,minmax(0,1fr));gap:1px;display:grid;overflow:hidden}.signal-info div,.progress-panel>div{background:#fbfcfb;min-width:0;padding:10px 12px}.signal-info div:last-child:nth-child(odd){grid-column:1/-1}.signal-info span,.progress-panel span{color:var(--muted);text-transform:uppercase;letter-spacing:.05em;font-size:.68rem;display:block}.signal-info strong,.progress-panel strong{text-overflow:ellipsis;white-space:nowrap;font-size:.88rem;display:block;overflow:hidden}.action-row{align-items:center;padding-top:18px}.primary-action-row{padding:0 0 16px}.button{justify-content:center;align-items:center;gap:.45rem;min-height:44px;display:inline-flex}.button.primary{background:var(--accent);border-color:var(--accent);color:#fff}.button.primary:hover:not(:disabled){background:var(--accent-dark);color:#fff}.button.subtle{color:var(--muted);margin-left:auto}.safety-strip{background:var(--warning-bg);width:100%;min-height:46px;color:var(--warning);border-top:1px solid #f0dfb6;align-items:center;gap:.55rem;margin:0;padding:12px 20px;line-height:1.4;display:flex}.safety-strip svg{flex:none}.safety-strip p{overflow-wrap:anywhere;margin:0;font-size:.82rem}.sweep-grid{border-top:0;grid-template-columns:repeat(5,minmax(0,1fr));padding-top:0}.progress-panel{background:var(--line);border:1px solid var(--line);border-radius:10px;grid-template-columns:repeat(3,minmax(0,1fr));gap:1px;margin-top:14px;display:grid;overflow:hidden}.progress-panel progress{appearance:none;border:0;grid-column:1/-1;width:100%;height:8px}.progress-panel progress::-webkit-progress-bar{background:#dfe6e3}.progress-panel progress::-webkit-progress-value{background:var(--accent)}.progress-panel progress::-moz-progress-bar{background:var(--accent)}.multi-toolbar{align-items:center;gap:24px;margin-bottom:16px;display:flex}.multi-toolbar .control-field{width:min(320px,100%)}.multi-toolbar p{color:var(--muted);font-size:.8rem}.tone-rows{gap:8px;display:grid}.tone-row{border:1px solid var(--line);background:#f8faf9;border-radius:10px;grid-template-columns:46px 1.15fr 1fr 1fr 1fr auto;align-items:end;gap:9px;padding:12px;display:grid}.tone-index{color:var(--accent);align-self:center;font-weight:800}.tone-row label{min-width:0;color:var(--muted);gap:3px;font-size:.68rem;font-weight:700;display:grid}.tone-row input,.tone-row select{width:100%;min-width:0;height:38px;color:var(--ink);background:#fff;border:1px solid #bec9c5;border-radius:7px;padding:.35rem .5rem}.tone-row-actions{gap:5px;display:flex}.tone-row-actions button{min-height:38px;padding:.35rem .5rem;font-size:.75rem}.tone-row-actions button[aria-pressed=true]{background:var(--accent-light);border-color:var(--accent);color:var(--accent-dark)}.compact-visualizer{background:#101b19;border-radius:10px;width:100%;height:105px;margin-top:12px;display:block}.dual-summary{background:var(--surface-soft);border-radius:10px;grid-template-columns:minmax(180px,.7fr) minmax(220px,1fr);align-items:center;gap:18px;margin-bottom:16px;padding:14px 16px;display:grid}.dual-summary>div span,.reference-display>span,.noise-description>span{color:var(--muted);text-transform:uppercase;letter-spacing:.05em;font-size:.72rem;font-weight:720;display:block}.dual-summary>div strong{color:var(--accent-dark);font-size:1.35rem}.dual-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;display:grid}.signal-card{border:1px solid var(--line);background:#fbfcfb;border-radius:11px;min-width:0;margin:0;padding:16px}.signal-card legend{color:var(--accent-dark);padding:0 .45rem;font-weight:800}.signal-card>.frequency-slider{margin:13px 0}.mini-control-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;display:grid}.dtmf-layout{grid-template-columns:minmax(250px,.7fr) minmax(0,1.3fr);gap:18px;display:grid}.keypad-panel,.sequence-panel{border:1px solid var(--line);border-radius:11px;padding:17px}.dtmf-readout{grid-template-columns:auto 1fr;align-items:center;gap:2px 12px;margin-bottom:12px;display:grid}.dtmf-readout>span:first-child{color:var(--muted);text-transform:uppercase;font-size:.75rem}.dtmf-readout strong{color:var(--accent-dark);font-size:1.45rem}.dtmf-readout>span:last-child{color:var(--muted);grid-column:1/-1;font-size:.82rem}.dtmf-keypad{grid-template-columns:repeat(3,1fr);gap:8px;display:grid}.dtmf-keypad button{min-height:48px;font-size:1.05rem}.advanced-keys{margin-top:12px}.advanced-keys summary,.note-table summary{cursor:pointer;color:var(--accent-dark);font-weight:700}.advanced-keys .button-row{margin-top:9px}.advanced-keys button{flex:1}.field-note{min-height:1.4em;color:var(--muted);margin:5px 0 12px;font-size:.78rem}.noise-controls{border-top:0;grid-template-columns:repeat(3,minmax(0,1fr));padding-top:0}.noise-description{border:1px solid var(--line);background:#fbfcfb;border-radius:10px;padding:20px}.noise-description strong{margin:.35rem 0 .55rem;font-size:1.25rem;display:block}.noise-description p{color:var(--muted);font-size:.86rem}.noise-description>span:last-child{color:var(--accent-dark);margin-top:1rem}.phase1-noise-controls{grid-template-columns:repeat(5,minmax(0,1fr))}.validation-note{color:var(--warning)}.headphone-note{color:#493b24;background:var(--warning-bg);border:1px solid #f0dfb6;border-radius:9px;align-items:center;gap:8px;margin:0 0 16px;padding:12px 14px;font-size:.87rem;display:flex}.headphone-note svg{color:var(--warning);flex:none}.binaural-frequency-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;display:grid}.binaural-frequency-grid .control-field{border:1px solid var(--line);background:#fbfcfb;border-radius:10px;padding:15px}.binaural-frequency-grid input[type=range]{width:100%;accent-color:var(--accent);margin-top:8px}.stereo-readout{color:#eefbf7;text-align:center;background:#101b19;border-radius:10px;grid-template-columns:1fr auto 1fr;align-items:center;gap:14px;margin:14px 0 0;padding:13px;display:grid}.stereo-readout span{color:#9fb6b0;text-transform:uppercase;letter-spacing:.06em;font-size:.7rem;display:block}.stereo-readout strong{font-variant-numeric:tabular-nums}.stereo-separation{color:#5ee0bd;align-items:center;font-weight:800;display:flex}.tone528-primary{grid-template-columns:130px minmax(150px,220px) 1fr;align-items:center;gap:12px;padding-bottom:16px;display:grid}.tone528-primary>label{font-size:.8rem;font-weight:750}.tone528-info{grid-template-columns:repeat(5,minmax(0,1fr));margin-top:6px}.comparison-panel{border:1px solid var(--line);background:#fbfcfb;border-radius:11px;margin-top:16px;padding:16px}.comparison-controls{grid-template-columns:repeat(2,minmax(0,1fr)) minmax(130px,.6fr);align-items:end;gap:12px;display:grid}.comparison-controls .number-unit{margin-top:4px}.comparison-difference{background:var(--surface-soft);border-radius:8px;padding:11px}.comparison-difference span{color:var(--muted);text-transform:uppercase;font-size:.7rem;display:block}.comparison-difference strong{color:var(--accent-dark);font-variant-numeric:tabular-nums}.comparison-panel .button-row{margin-top:12px}.reference-display{text-align:center;background:var(--surface-soft);border-radius:11px;padding:20px}.reference-display>strong{color:var(--accent-dark);font-variant-numeric:tabular-nums;font-size:clamp(2.2rem,7vw,4rem);line-height:1.15;display:block}.reference-display p{color:var(--muted);margin:.4rem 0 0}.reference-display p span{margin-right:.6rem}.note-table{margin-top:18px}.responsive-table{margin-top:10px;overflow-x:auto}.responsive-table table{border-collapse:collapse;font-variant-numeric:tabular-nums;width:100%}.responsive-table th,.responsive-table td{border-bottom:1px solid var(--line);text-align:left;white-space:nowrap;padding:.55rem .7rem}.tempo-display{grid-template-columns:80px minmax(150px,210px) 1fr;align-items:center;gap:12px 18px;padding:12px 0 18px;display:grid}.tempo-display>span{color:var(--muted);font-size:.82rem;font-weight:750}.tempo-display>div:nth-child(2){align-items:baseline;gap:8px;display:flex}.tempo-display input[type=number]{width:120px;color:var(--accent-dark);border:1px solid #bfcac6;border-radius:8px;padding:.35rem .55rem;font-size:2rem;font-weight:800}.tempo-display>input[type=range]{width:100%;accent-color:var(--accent)}.tempo-display .compact-row{grid-column:2/-1}.beat-display{background:#101b19;border-radius:10px;justify-content:center;align-items:center;gap:10px;min-height:74px;margin-top:4px;padding:14px;display:flex}.beat-display span{color:#9fb6b0;border:2px solid #46645e;border-radius:50%;place-items:center;width:38px;height:38px;font-weight:760;transition:background 80ms,transform 80ms;display:grid}.beat-display span.active{color:#10201c;background:#5ee0bd;border-color:#5ee0bd;transform:scale(1.08)}.keyboard-hint,.timer-readout,.beat-readout{color:var(--muted);font-size:.76rem}.beat-readout{color:var(--accent-dark)}.timer-readout{color:var(--accent-dark);margin-left:auto;font-weight:700}.hearing-setup{background:var(--warning-bg);border:1px solid #f0dfb6;border-radius:11px;justify-content:space-between;align-items:center;gap:24px;padding:20px;display:flex}.hearing-setup>div{align-items:flex-start;gap:14px;display:flex}.hearing-setup svg{color:var(--warning);flex:none}.hearing-setup p{color:#5f451e;margin:0}.hearing-prompt{text-align:center;background:var(--surface-soft);border-radius:10px;padding:18px}.hearing-prompt span{color:var(--muted);text-transform:uppercase;font-size:.75rem;display:block}.hearing-prompt strong{color:var(--accent-dark);margin:.3rem 0;font-size:1.35rem;display:block}.hearing-prompt p{max-width:650px;color:var(--muted);margin:.4rem auto 0;font-size:.82rem}.hearing-results{border:1px solid var(--line);border-radius:10px;margin-top:18px;padding:18px}.hearing-results>p:last-child{color:var(--muted);font-size:.82rem}.guide-strip{background:var(--line);border:1px solid var(--line);border-radius:10px;grid-template-columns:repeat(5,1fr);gap:1px;margin:0 0 18px;padding:0;list-style:none;display:grid;overflow:hidden}.guide-strip li{color:#43514d;background:#f8faf9;align-items:center;gap:.55rem;padding:10px;font-size:.76rem;font-weight:650;display:flex}.guide-strip span{background:var(--accent-light);width:23px;height:23px;color:var(--accent-dark);border-radius:50%;flex:none;place-items:center;font-size:.7rem;display:grid}.guided-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;display:grid}.guided-grid section{border:1px solid var(--line);border-radius:10px;padding:16px}.guided-grid .guided-section-title{color:var(--ink);letter-spacing:-.025em;margin:0;font-size:1rem;font-weight:700;line-height:1.18}.guided-grid p{color:var(--muted);margin:.25rem 0 .75rem;font-size:.8rem}.guided-grid button{align-items:center;gap:.35rem;display:inline-flex}.inline-control{gap:8px;display:flex}.inline-control .number-unit{flex:1}.small-presets{margin-top:8px}.small-presets button{min-width:39px;padding:.25rem .4rem}.guided-footer{grid-template-columns:minmax(200px,1fr) minmax(180px,1fr) auto;align-items:center;gap:20px;padding-top:16px;display:grid}.guided-footer label{gap:4px;display:grid}.guided-footer strong{color:var(--accent-dark);font-size:.88rem}.solfeggio-cards{grid-template-columns:repeat(9,minmax(0,1fr));gap:8px;display:grid}.solfeggio-cards button{place-items:center;min-width:0;padding:10px 4px;line-height:1.12;display:grid}.solfeggio-cards strong{font-variant-numeric:tabular-nums;font-size:1.05rem}.solfeggio-cards span{color:var(--muted);font-size:.7rem}.solfeggio-cards small{color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin-top:5px;font-size:.62rem}.solfeggio-cards button.selected,.solfeggio-cards button[aria-pressed=true]{background:var(--accent-light);border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}.solfeggio-cards button.selected small{color:var(--accent-dark);font-weight:800}.workspace-section{border:1px solid var(--line);background:#fbfcfb;border-radius:11px;margin-top:16px;padding:16px}.workspace-section-title{justify-content:space-between;align-items:center;margin-bottom:10px;display:flex}.workspace-section-title span{color:var(--muted);text-transform:uppercase;letter-spacing:.06em;font-size:.7rem;display:block}.workspace-section-title strong{color:var(--accent-dark);font-size:1.1rem;display:block}.sequence-comparison-grid{grid-template-columns:minmax(0,1.45fr) minmax(250px,.55fr);gap:14px;display:grid}.sequence-list{grid-template-columns:repeat(3,minmax(0,1fr));gap:6px;margin:0;padding:0;list-style:none;display:grid}.sequence-list li{border:1px solid var(--line);background:#fff;border-radius:8px;align-items:center;gap:7px;padding:7px 9px;display:flex}.sequence-list li>span{background:var(--surface-soft);width:20px;height:20px;color:var(--accent-dark);border-radius:50%;flex:none;place-items:center;font-size:.65rem;font-weight:800;display:grid}.sequence-list label{cursor:pointer;align-items:center;gap:6px;font-size:.78rem;display:flex}.sequence-list input{accent-color:var(--accent)}.sequence-summary{min-height:1.35em;color:var(--muted);overflow-wrap:anywhere;margin:9px 0;font-size:.72rem}.sequence-position{background:var(--line);border:1px solid var(--line);border-radius:8px;grid-template-columns:repeat(2,minmax(0,1fr));gap:1px;margin-top:12px;display:grid;overflow:hidden}.sequence-position>div{background:#fff;padding:9px 11px}.sequence-position span{color:var(--muted);text-transform:uppercase;font-size:.65rem;display:block}.sequence-position strong{font-size:.82rem;display:block}.solf-comparison{flex-direction:column;gap:10px;display:flex}.solf-comparison .button-row button{flex:1}.dog-primary{grid-template-columns:190px minmax(170px,230px) 1fr;align-items:center;gap:14px;display:grid}.dog-primary>label{font-size:.82rem;font-weight:750}.dog-primary>input{width:100%;accent-color:var(--accent)}.dog-controls{grid-template-columns:repeat(3,minmax(0,1fr))}.dog-pulse-controls{grid-template-columns:repeat(3,minmax(0,1fr));padding-top:12px}.dog-readout{color:#effbf8;background:#101b19;border-radius:10px;grid-template-columns:auto 1fr;align-items:center;gap:2px 14px;padding:14px 16px;display:grid}.dog-readout>span{color:#9fb6b0;text-transform:uppercase;font-size:.68rem}.dog-readout strong{color:#5ee0bd}.dog-readout p{color:#b8cac5;grid-column:1/-1;margin:.3rem 0 0;font-size:.76rem}.upload-zone{cursor:pointer;background:#f9fbfa;border:2px dashed #a9bcb6;border-radius:12px;grid-template-columns:auto 1fr auto;align-items:center;gap:18px;min-height:150px;padding:24px;display:grid}.upload-zone.dragging{border-color:var(--accent);background:var(--accent-light)}.upload-zone>svg,.loaded-file>svg{color:var(--accent)}.upload-zone>div,.loaded-file>div{min-width:0;display:grid}.upload-zone strong{font-size:1.08rem}.upload-zone span,.loaded-file span{color:var(--muted);font-size:.82rem}.upload-zone small,.loaded-file small{color:var(--accent-dark);font-size:.73rem}.upload-zone input[type=file]{clip:rect(0 0 0 0);width:1px;height:1px;position:absolute;overflow:hidden}.loaded-file{border:1px solid var(--line);background:var(--surface-soft);border-radius:11px;grid-template-columns:auto 1fr auto auto;align-items:center;gap:12px;padding:14px 16px;display:grid}.loaded-file strong{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.stretch-workspace{margin-top:16px}.stretch-waveform-wrap{background:#101b19;border-radius:10px;position:relative;overflow:hidden}.stretch-waveform-wrap canvas{cursor:crosshair;width:100%;height:170px;display:block}.waveform-time{color:#d8e9e4;pointer-events:none;justify-content:space-between;font-size:.7rem;display:flex;position:absolute;bottom:8px;left:10px;right:10px}.seek-control{color:var(--muted);grid-template-columns:auto 1fr;align-items:center;gap:12px;padding:8px 0;font-size:.75rem;font-weight:700;display:grid}.seek-control input{width:100%;accent-color:var(--accent)}.stretch-duration-grid{background:var(--line);border:1px solid var(--line);border-radius:9px;grid-template-columns:repeat(3,minmax(0,1fr));gap:1px;display:grid;overflow:hidden}.stretch-duration-grid>div{background:#fbfcfb;padding:10px 12px}.stretch-duration-grid span{color:var(--muted);text-transform:uppercase;letter-spacing:.05em;font-size:.66rem;display:block}.stretch-duration-grid strong{color:var(--accent-dark);font-size:.84rem;display:block}.tempo-control{border:1px solid var(--line);border-radius:10px;margin-top:14px;padding:14px}.tempo-control>label{justify-content:space-between;font-size:.82rem;font-weight:750;display:flex}.tempo-control output{color:var(--accent-dark);font-size:1.05rem}.tempo-control>input{width:100%;accent-color:var(--accent);margin:7px 0 10px}.toggle-field{background:var(--surface-soft);cursor:pointer;border-radius:9px;align-items:flex-start;gap:10px;margin-top:12px;padding:11px 13px;display:flex}.toggle-field input{width:19px;height:19px;accent-color:var(--accent);flex:none}.toggle-field span{line-height:1.4;display:grid}.toggle-field small{color:var(--muted)}.stretch-playback{padding-top:12px}.loop-panel{border:1px solid var(--line);border-radius:10px;grid-template-columns:minmax(190px,1.2fr) 1fr 1fr auto;align-items:end;gap:10px;margin-top:14px;padding:14px;display:grid}.loop-panel .toggle-field{align-self:stretch;margin:0}.loop-panel .field-note{grid-column:1/-1;margin:0}.export-panel{border:1px solid var(--line);background:#f8faf9;border-radius:10px;grid-template-columns:1fr auto auto;align-items:center;gap:12px;margin-top:14px;padding:14px;display:grid}.export-panel>div{display:grid}.export-panel span{color:var(--muted);font-size:.76rem}.export-panel .button.subtle{margin-left:0}.export-progress{align-items:center;gap:12px;margin-top:8px;display:flex}.export-progress progress{width:100%;height:10px;accent-color:var(--accent)}.time-stretcher-tool>audio{display:none}@media (width<=1050px){.desktop-nav{display:none}.mobile-nav{display:block}.footer-inner{grid-template-columns:repeat(2,1fr)}.footer-about{grid-column:1/-1}.control-grid,.sweep-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.visualizer-panel{grid-template-columns:1fr}.tone-row{grid-template-columns:38px repeat(2,1fr)}.tone-row-actions{grid-column:2/-1}.mini-control-grid,.noise-controls,.phase1-noise-controls{grid-template-columns:repeat(2,minmax(0,1fr))}.tone528-info{grid-template-columns:repeat(3,minmax(0,1fr))}.dtmf-layout{grid-template-columns:minmax(220px,.8fr) minmax(0,1.2fr)}.solfeggio-cards{grid-template-columns:repeat(5,minmax(0,1fr))}.sequence-comparison-grid{grid-template-columns:1fr}}@media (width<=700px){html{scroll-behavior:auto}.header-inner,.page-shell{padding-left:16px;padding-right:16px}.page-shell{padding-top:12px;padding-bottom:70px}.brand{font-size:.91rem}.brand-mark{width:32px;height:32px}.article-intro{margin:30px auto 44px}.content-section{margin:58px auto}.prose-grid,.step-grid,.card-grid{grid-template-columns:1fr}.wide-block{grid-column:auto}.prose-block,.step-card{padding:22px}.footer-inner{grid-template-columns:1fr;gap:32px}.footer-about{grid-column:auto}.tool-card-header{flex-direction:column;align-items:flex-start;gap:.35rem}.tool-card-header>div{flex-direction:column;align-items:flex-start;gap:.2rem}.local-badge{display:none}.tool-status{text-align:left;width:100%;max-width:none}.single-tool,.sweep-tool,.multi-tool,.guided-tool,.subwoofer-tool,.dual-tool,.dtmf-tool,.noise-tool,.phase1-noise-tool,.binaural-tool,.tone528-tool,.tuning-tool,.metronome-tool,.hearing-tool,.solfeggio-tool,.dog-whistle-tool,.time-stretcher-tool{padding:15px}.primary-frequency{grid-template-columns:1fr}.primary-frequency>label{margin-bottom:-5px}.primary-frequency .compact-row{grid-column:auto}.control-grid,.sweep-grid,.guided-grid{grid-template-columns:1fr}.visualizer-panel canvas{height:130px}.action-row .button{flex:130px}.button.subtle{margin-left:0}.safety-strip{align-items:flex-start;margin:0;padding:12px 15px}.progress-panel{grid-template-columns:1fr}.progress-panel progress{grid-column:auto}.multi-toolbar{flex-direction:column;align-items:flex-start;gap:2px}.tone-row{grid-template-columns:34px 1fr;padding:12px 10px}.tone-row label,.tone-row-actions{grid-column:2}.tone-index{grid-row:1/span 5;align-self:start;padding-top:8px}.guide-strip{grid-template-columns:1fr 1fr}.guided-footer{grid-template-columns:1fr;gap:10px}.dual-summary,.dual-grid,.dtmf-layout,.mini-control-grid,.noise-controls,.phase1-noise-controls,.tempo-display,.binaural-frequency-grid,.comparison-controls,.tone528-info,.tone528-primary{grid-template-columns:1fr}.stereo-readout{grid-template-columns:1fr;gap:7px}.stereo-separation{justify-content:center}.dual-summary{gap:8px}.tempo-display .compact-row{grid-column:auto}.tempo-display>div:nth-child(2){justify-content:center}.tempo-display>span{text-align:center}.beat-display{justify-content:flex-start;overflow-x:auto}.hearing-setup{flex-direction:column;align-items:stretch}.hearing-setup .button{width:100%}.solfeggio-cards{grid-template-columns:repeat(3,minmax(0,1fr))}.sequence-list,.dog-primary,.loaded-file,.upload-zone,.stretch-duration-grid,.loop-panel,.export-panel{grid-template-columns:1fr}.dog-primary>label{margin-bottom:-6px}.dog-controls,.dog-pulse-controls{grid-template-columns:1fr}.upload-zone{text-align:center;justify-items:center}.loaded-file{justify-items:stretch}.loaded-file>svg{justify-self:center}.stretch-waveform-wrap canvas{height:135px}.loop-panel .field-note{grid-column:auto}.export-panel .button{width:100%}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important}}.pitch-tool,.tuner-tool{padding:20px}[hidden]{display:none!important}audio-tool[data-mode=metronome] button,.pitch-tool button,.tuner-tool button{min-height:44px}audio-tool[data-mode=metronome] input[type=range],.pitch-tool input[type=range]{appearance:none;min-height:44px;accent-color:var(--accent);background:0 0}audio-tool[data-mode=metronome] input[type=range]::-webkit-slider-runnable-track,.pitch-tool input[type=range]::-webkit-slider-runnable-track{background:#cbded8;border-radius:4px;height:6px}audio-tool[data-mode=metronome] input[type=range]::-webkit-slider-thumb,.pitch-tool input[type=range]::-webkit-slider-thumb{appearance:none;background:var(--accent);border-radius:50%;width:24px;height:24px;margin-top:-9px}audio-tool[data-mode=metronome] input[type=range]::-moz-range-thumb,.pitch-tool input[type=range]::-moz-range-thumb{background:var(--accent);border:0;border-radius:50%;width:24px;height:24px}audio-tool[data-mode=metronome] input[type=range]::-moz-range-track,.pitch-tool input[type=range]::-moz-range-track{background:#cbded8;border-radius:4px;height:6px}.pitch-tool select,.tuner-tool select,.pitch-tool input[type=number],.tuner-tool input[type=number]{min-height:44px}.metronome-tool .control-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.metronome-tool .beat-display{flex-wrap:wrap;gap:8px;display:flex;overflow:visible}.beat-display button{font-variant-numeric:tabular-nums;border-radius:9px;min-width:48px}.beat-display button[data-state=mute]{border-style:dashed}.beat-display button[data-state=accent]{border-width:2px}.beat-display button.active{background:var(--accent);color:#fff;outline:2px solid var(--accent-light)}.pitch-controls{grid-template-columns:2fr 1fr 1fr auto;align-items:end;gap:14px;margin:16px 0 10px;display:grid}.pitch-playback{flex-wrap:wrap;align-items:end;gap:8px;display:flex}.pitch-playback>label{flex:140px}.pitch-seek{margin-top:12px}.pitch-tool .file-picker{min-height:44px;position:relative;overflow:hidden}.file-picker:focus-within{outline-offset:3px;outline:3px solid #e6a431}.pitch-tool .file-picker input{opacity:0;cursor:pointer;width:100%;position:absolute;inset:0}.pitch-file-info{margin-top:14px}.pitch-file-info .loaded-file{flex-wrap:wrap;justify-content:space-between;gap:10px;display:flex}.pitch-file-info .loaded-file>div{overflow-wrap:anywhere;min-width:0}.pitch-waveform{background:#101b19;border-radius:9px;width:100%;height:110px;display:block}.pitch-tool .waveform-time{flex-wrap:wrap;justify-content:space-between;gap:4px;margin:5px 0;display:flex}.tuner-intro{justify-content:space-between;align-items:center;gap:16px;display:flex}.tuner-intro p{max-width:650px;margin:0}.tuner-intro strong{color:var(--accent);font-size:.85rem}.tuner-reading{text-align:center;max-width:720px;margin:12px auto}.tuner-note{font-size:clamp(3.5rem,10vw,5rem);line-height:1.2;display:block}.tuner-numbers{font-variant-numeric:tabular-nums;flex-wrap:wrap;justify-content:center;gap:24px;display:flex}.tuner-meter{border:1px solid var(--line);background:#e6eeeb;border-radius:8px;height:34px;margin:12px 8px 0;position:relative}.tuner-center{background:var(--accent-light);border-left:1px solid var(--accent);border-right:1px solid var(--accent);width:10%;height:100%;position:absolute;left:45%}.tuner-needle{background:var(--ink);width:4px;position:absolute;top:-4px;bottom:-4px;left:50%;transform:translate(-50%)}.meter-labels{justify-content:space-between;gap:8px;font-size:.8rem;display:flex}.tuner-controls{grid-template-columns:1fr 1fr 1fr 1fr;align-items:end;gap:14px;display:grid}.reference-presets{flex-wrap:wrap;gap:6px;display:flex}.tuner-controls meter{width:100%;height:44px}.mobile-nav nav{max-height:calc(100dvh - 125px);overflow-y:auto}.nav-category{color:var(--muted);padding:.5rem .65rem .1rem;font-size:.73rem;font-weight:700}@media (width<=768px){.pitch-controls,.tuner-controls,.metronome-tool .control-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.pitch-tool,.tuner-tool{padding:15px}.tuner-intro{flex-direction:column;align-items:flex-start;gap:6px}}@media (width<=390px){.pitch-controls{grid-template-columns:1fr 1fr}.pitch-controls>label:first-child,.pitch-controls>button{grid-column:1/-1}.metronome-tool .control-grid,.tuner-controls{gap:10px}.meter-labels{gap:3px;font-size:.69rem}}