@import"https://fonts.googleapis.com/css2?family=Space+Mono:ital,wght@0,400;0,700;1,700&display=swap";:root{--ground: #000000;--panel: #171717;--panel-2: #171717;--answer-surface: #171717;--answer-hover: #242424;--line: #2c2e2c;--line-soft: #1e201e;--ink: #ffffff;--muted: #9aa09a;--faint: #5a5e5a;--accent: #b4f34a;--accent-ink: #000000;--blue: #2800ff;--gs-green: #77f21a;--bad: #ff4d4d;--font-display: "Space Mono", ui-monospace, Menlo, monospace;--font-mono: "Space Mono", ui-monospace, Menlo, monospace;--radius: 0;--border: 1px solid var(--line);--space-1: 4px;--space-2: 8px;--space-3: 10px;--space-4: 14px;--space-5: 16px;--space-6: 20px;--space-7: 22px;--space-8: 36px;--site-width: min(1240px, calc(100vw - 32px) );font-family:var(--font-mono);color:var(--ink);background:var(--ground);color-scheme:dark;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*,*:before,*:after{box-sizing:border-box;border-radius:0}html,body,#root{min-height:100%}body{margin:0;min-width:320px;min-height:100vh;background-color:var(--ground);background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='150' height='150' viewBox='0 0 150 150'%3E%3Cg fill='none' stroke='%23ffffff' stroke-width='2' opacity='0.04'%3E%3Cpath d='M18 60c0-16 11-27 25-27s25 11 25 27v20l-7-6-6 6-6-6-6 6-6-6-6 6-7-6z'/%3E%3Ccircle cx='34' cy='55' r='2' fill='%23fff' stroke='none'/%3E%3Ccircle cx='44' cy='55' r='2' fill='%23fff' stroke='none'/%3E%3Cpath d='M90 118c0-14 9-23 21-23s21 9 21 23v16l-6-5-5 5-5-5-5 5-5-5-5 5-6-5z'/%3E%3Ccircle cx='104' cy='114' r='1.7' fill='%23fff' stroke='none'/%3E%3Ccircle cx='113' cy='114' r='1.7' fill='%23fff' stroke='none'/%3E%3C/g%3E%3C/svg%3E");color:var(--ink)}a{color:inherit;text-decoration:none}button,input{font:inherit}button{cursor:pointer}img{max-width:100%;display:block}strong,h1,h2,h3,.hero-title,.ab-switch strong,.session-panel__score strong,.brandmark__copy,.promo-card__copy strong{font-family:var(--font-display);font-weight:700;letter-spacing:0;text-transform:uppercase;text-wrap:balance}.app-shell{min-height:100vh;display:grid;grid-template-rows:auto auto auto 1fr auto;background:var(--ground)}.topbar{width:var(--site-width);margin:0 auto;min-height:62px;display:grid;grid-template-columns:196px minmax(0,1fr) 244px;align-items:center;border:var(--border);border-bottom:0;background:var(--ground)}.topbar__brandmark,.topbar__tabs,.topbar__meta{min-width:0;min-height:62px;display:flex;align-items:center}.topbar__brandmark,.topbar__tabs{border-right:var(--border)}.topbar__brandmark{padding:0 var(--space-5)}.brandmark{display:inline-flex;min-height:44px;align-items:center;gap:var(--space-3)}.brandmark__square{width:30px;height:30px;flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;background:transparent;border:0;line-height:1;padding:0}.brandmark__logo{width:100%;height:100%;object-fit:contain}.brandmark__copy{font-size:20px;line-height:1}.topbar__tabs{gap:0;overflow-x:auto;scrollbar-width:none}.topbar__tabs::-webkit-scrollbar,.source-list::-webkit-scrollbar{display:none}.top-tab{flex:0 0 auto;min-height:62px;padding:0 var(--space-5);border:0;border-bottom:2px solid transparent;background:transparent;color:var(--muted);text-transform:uppercase;font-size:11px;letter-spacing:0}.top-tab.is-active{background:var(--panel-2);color:var(--ink);border-bottom-color:var(--accent)}.topbar__meta{justify-content:flex-end;gap:var(--space-3);padding:0 var(--space-5)}.streak-chip,.level-chip{display:inline-flex;align-items:center;gap:8px;font-size:11px;letter-spacing:0;text-transform:uppercase}.streak-chip strong{color:var(--accent);font-size:14px;font-family:var(--font-mono)}.level-chip{gap:10px}.xp-meter,.progress-rail{height:4px;background:var(--line-soft);overflow:hidden}.xp-meter{width:60px}.xp-meter div,.progress-rail div{height:100%;background:var(--accent)}.meta-square{width:30px;height:30px;border:var(--border);background:var(--panel);color:var(--ink);display:inline-flex;align-items:center;justify-content:center;padding:0}.brand-logo{width:18px;height:18px;object-fit:contain}.demo-source{width:var(--site-width);margin:0 auto;border:var(--border);border-top:0;background:var(--panel)}.demo-source__inner{padding:var(--space-5);display:grid;gap:1px}.demo-source__head,.stat-line,.player-wave__focusline,.session-panel__score{display:flex;align-items:baseline;justify-content:space-between;gap:var(--space-3)}.demo-source__head span,.demo-source__actions p,.mobile-strip span,.metrics-grid span,.sidebar-progress__row span,.section-label,.source-pill,.playing-pill,.transport-chip,.volume-track span,.process-toggle button,.segmented button,.answer-chip,.feedback-panel p,.timeline-panel,.keyboard-bar,.promo-card__copy small,.promo-card__buy{font-family:var(--font-mono);text-transform:uppercase;letter-spacing:0}.demo-source__meta,.demo-source__urls,.stem-tabs{display:grid;gap:1px;background:var(--line-soft)}.demo-source__meta{grid-template-columns:repeat(2,minmax(0,1fr))}.demo-source__urls{grid-template-columns:repeat(3,minmax(0,1fr))}.demo-source input,.stem-tabs button,.remote-load-button{min-height:40px;border:0;background:var(--panel-2);color:var(--ink);padding:0 12px}.stem-tabs .is-active,.remote-load-button{background:var(--accent);color:var(--accent-ink)}.demo-source__actions{display:flex;justify-content:space-between;gap:var(--space-5);align-items:center}.mobile-strip{display:none;width:var(--site-width);margin:0 auto;border-left:var(--border);border-right:var(--border);border-bottom:var(--border);background:var(--panel);position:relative;z-index:19}.mobile-strip div{flex:1 1 0;padding:var(--space-3) var(--space-4);border-right:var(--border);display:grid;gap:4px;font-variant-numeric:tabular-nums}.mobile-strip div:last-child{border-right:0}.mobile-strip strong{font-size:16px}.app-frame{width:var(--site-width);margin:0 auto}.app-body{display:grid;grid-template-columns:196px minmax(0,1fr) 244px;border:var(--border);border-top:0}.app-body.is-hidden{display:none}.setup-rail,.round-main,.stats-sidebar{min-width:0}.setup-rail,.round-main{border-right:var(--border)}.setup-rail,.round-main,.stats-sidebar{background:var(--ground)}.panel{background:var(--panel);border-bottom:var(--border);padding:var(--space-5)}.panel:last-child{border-bottom:0}.setup-rail{display:grid;align-content:start}.panel--section{display:grid;gap:var(--space-4)}.section-label{display:inline-flex;align-items:center;gap:var(--space-1);color:var(--faint);font-size:10px;font-weight:500;letter-spacing:0}.segmented{display:grid;gap:1px;background:var(--line-soft)}.segmented--difficulty{grid-template-columns:repeat(3,minmax(0,1fr))}.segmented button,.source-pill,.transport-chip,.process-toggle button,.feedback-next,.action-secondary,.action-primary,.top-tab,.meta-square{transition:color .14s ease,background-color .14s ease,border-color .14s ease,opacity .14s ease}.segmented button,.process-toggle button{min-height:42px;border:0;background:var(--panel);color:var(--muted);font-size:11px;font-weight:500}.segmented button.is-active{background:var(--accent);color:var(--accent-ink);font-weight:700}.source-list{display:grid;gap:var(--space-3)}.source-pill{min-height:28px;border:0;background:transparent;color:var(--muted);display:inline-flex;align-items:center;justify-content:flex-start;gap:var(--space-2);padding:0;font-size:11px;font-weight:500;text-align:left}.source-pill__marker{width:7px;height:7px;border:1px solid var(--line);background:transparent;flex:0 0 auto}.source-pill.is-active{color:var(--ink)}.source-pill.is-active .source-pill__marker{background:var(--accent);border-color:var(--accent)}.progress-rail--thin{height:3px}.sidebar-progress__rows{display:grid;gap:var(--space-4)}.round-main{display:grid;grid-template-rows:auto auto}.player-panel{background:var(--ground);display:grid;gap:var(--space-4);padding:18px}.audio-load-panel{width:var(--site-width);min-height:min(440px,calc(100vh - 160px));margin:0 auto;display:grid;align-content:center;justify-items:start;gap:var(--space-4);padding:clamp(36px,8vw,96px);border:var(--border);border-top:0;background:var(--ground)}.audio-load-panel--compact{width:100%;min-height:204px;margin:0;padding:var(--space-6);border:var(--border);background:var(--panel)}.audio-load-panel__title,.audio-load-panel__meta{margin:0;text-transform:uppercase}.audio-load-panel__title{max-width:23ch;color:var(--ink);font-family:var(--font-display);font-size:clamp(22px,4vw,38px);font-weight:700;line-height:1.05}.audio-load-panel--compact .audio-load-panel__title{font-size:18px}.audio-load-panel__meta{color:var(--muted);font-size:12px}.audio-load-panel__indicator{display:block;width:min(260px,100%);height:4px;overflow:hidden;background:var(--line-soft)}.audio-load-panel__indicator i{display:block;width:36%;height:100%;background:var(--accent);animation:audio-load-indicator 1s ease-in-out infinite alternate}.audio-load-panel__retry{min-height:44px;padding:0 var(--space-5);border:1px solid var(--accent);background:var(--accent);color:var(--accent-ink);font-size:12px;font-weight:700;text-transform:uppercase}.audio-load-panel.is-error{border-color:var(--bad)}@keyframes audio-load-indicator{0%{transform:translate(0)}to{transform:translate(178%)}}.player-panel__top{display:flex;justify-content:space-between;align-items:flex-start;gap:var(--space-5)}.hero-title{max-width:none;margin:0;font-family:var(--font-mono);font-size:24px;font-weight:700;line-height:1.5;letter-spacing:0;text-wrap:wrap}.hero-title span{display:inline-block;max-width:100%;color:var(--ink);background:var(--blue);font-style:italic;padding:4px 14px;box-decoration-break:clone;-webkit-box-decoration-break:clone}.playing-pill{color:var(--accent);font-size:11px;font-weight:500}.ab-switch{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1px}.ab-switch button{position:relative;transition:transform .25s ease,background-color .25s ease,color .14s ease;min-height:92px;border:var(--border);background:var(--panel);color:var(--ink);display:grid;justify-items:start;align-content:center;gap:6px;padding:var(--space-5)}.ab-switch button strong{font-size:24px;line-height:1}.ab-switch button span{color:var(--muted);font-size:10px}.ab-switch button.is-active{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}.ab-switch button.is-active span{color:#0009}.player-wave{display:grid;gap:var(--space-3)}.player-wave__focusline strong{font-size:13px}.wave-strip{position:relative;height:46px;border-left:0;background:transparent;overflow:hidden}.wave-strip__region{display:none}.wave-strip:before,.wave-strip:after{content:none}.wave-strip svg{position:relative;z-index:1;width:100%;height:100%}.wave-bar{fill:var(--faint);opacity:.82;shape-rendering:crispEdges}.wave-bar--played{fill:var(--accent);opacity:1}.playhead{position:absolute;top:0;bottom:0;width:2px;background:var(--accent);z-index:3}.player-controls{display:grid;gap:var(--space-4)}.player-controls__row{display:flex;gap:var(--space-3);align-items:center}.transport__primary{width:44px;height:44px;flex:0 0 auto;border:var(--border);background:var(--panel);color:var(--ink);display:inline-flex;align-items:center;justify-content:center;padding:0}.transport__icon svg{width:18px;height:18px;fill:currentColor}.transport-bar{min-width:0;flex:1 1 auto;display:flex;align-items:center;gap:var(--space-2);flex-wrap:wrap}.transport-chip,.process-toggle button,.feedback-next,.action-secondary{min-height:32px;padding:0 12px;border:var(--border);background:transparent;color:var(--muted);font-size:10px;font-weight:500}.transport-chip.is-active{border-color:var(--accent);color:var(--ink)}.volume-track{min-width:120px;flex:1 1 160px;display:flex;align-items:center;gap:var(--space-3);color:var(--faint);font-size:10px}.volume-track input{width:100%;margin:0;accent-color:var(--accent)}.source-list--pills{display:inline-flex;gap:1px;overflow-x:auto;min-width:0;padding-bottom:2px}.source-list--pills .source-pill{min-height:34px;padding:0 12px;border:var(--border);background:var(--panel);color:var(--muted);white-space:nowrap}.source-list--pills .source-pill.is-active{color:var(--ink)}.process-toggle{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1px;background:var(--line-soft);align-self:flex-start}.process-toggle button{min-width:128px;background:var(--panel);border:0}.process-toggle .is-active{background:var(--accent);color:var(--accent-ink);font-weight:700}.player-controls__row--sources{justify-content:space-between}.player-controls__row--sources .source-list--pills{flex:1 1 auto}.answer-panel{background:transparent;display:grid;gap:var(--space-5)}.answer-panel__head{display:grid;gap:var(--space-2)}.answer-panel__head h2{margin:0;font-size:15px;line-height:1.15}.hint-row{position:relative;width:100%;max-width:none;min-height:28px;padding:6px 10px;border:var(--border);background:var(--panel-2);color:var(--muted);text-align:left}.hint-row.is-visible{border-color:var(--line-soft)}.hint-overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:var(--faint);font-size:10px;font-weight:500;pointer-events:none}.hint-copy{position:relative;display:inline-block;max-width:65ch;color:var(--muted);font-size:12px;line-height:1.35;opacity:.24;filter:blur(10px);-webkit-user-select:none;user-select:none}.hint-copy:before{content:"// "}.hint-copy.is-visible{opacity:1;filter:blur(0);-webkit-user-select:text;user-select:text}.answer-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1px;background:var(--ground);border:1px solid var(--ground)}.answer-chip{min-height:188px;border:0;border:1px solid transparent;background:var(--answer-surface);color:var(--ink);display:grid;align-content:start;gap:10px;padding:var(--space-5);text-align:left;position:relative;transition:transform .25s ease,color .14s ease,background-color .25s ease,border-color .14s ease,opacity .14s ease}.answer-chip__index{color:var(--faint);font-size:10px;letter-spacing:0}.answer-chip__diagram{height:58px;display:flex;align-items:center}.answer-chip__diagram svg{width:100%;height:52px;overflow:visible}.answer-chip__title{font-family:var(--font-display);font-size:15px;font-weight:700;line-height:1.3;letter-spacing:0;text-transform:uppercase;text-wrap:balance}.answer-chip__title-accent{color:inherit}.answer-chip__spec,.answer-chip__note{font-size:11px;letter-spacing:0;text-transform:uppercase}.answer-chip__spec{color:var(--muted)}.answer-chip__spec strong{color:var(--accent);font-weight:500}.answer-chip__note{color:var(--muted)}@media(hover:hover)and (pointer:fine){.ab-switch button:not(:disabled):hover{transform:translateY(-4px);z-index:1}.answer-chip:not(:disabled):hover{transform:translateY(-4px);z-index:1}.answer-chip:not(:disabled):not(.is-selected):hover{background:var(--answer-hover)}}.answer-chip:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}.answer-chip.is-selected{border-color:var(--accent);background:var(--accent);color:var(--accent-ink)}.answer-chip.is-selected .answer-chip__title-accent,.answer-chip.is-selected .answer-chip__spec strong,.answer-chip.is-selected .answer-chip__note,.answer-chip.is-selected .answer-chip__index,.answer-chip.is-selected .answer-chip__spec,.answer-chip.is-correct .answer-chip__title-accent,.answer-chip.is-correct .answer-chip__spec strong,.answer-chip.is-correct .answer-chip__note,.answer-chip.is-correct .answer-chip__index,.answer-chip.is-correct .answer-chip__spec{color:var(--accent-ink)}.answer-chip.is-locked:not(.is-wrong),.answer-chip.is-correct{border-color:var(--accent);background:var(--accent);color:var(--accent-ink)}.answer-chip.is-wrong{border-color:var(--bad)}.answer-chip.is-wrong .answer-chip__title-accent,.answer-chip.is-wrong .answer-chip__spec strong{color:var(--bad)}.action-bar{display:flex;gap:var(--space-3);align-items:stretch}.action-secondary{min-width:96px}.action-primary{flex:1 1 auto;min-height:44px;padding:0 16px;border:1px solid var(--accent);background:var(--accent);color:var(--accent-ink);font-family:var(--font-display);font-size:14px;letter-spacing:0;text-transform:uppercase}.feedback-panel{border:var(--border);display:grid;grid-template-columns:minmax(0,1fr) auto;gap:var(--space-5);padding:var(--space-5);align-items:center}.feedback-panel.is-correct{border-color:var(--accent)}.feedback-panel.is-wrong{border-color:var(--bad)}.feedback-panel__copy{display:grid;gap:var(--space-2)}.feedback-panel__copy strong{font-size:16px;color:var(--accent)}.feedback-panel.is-wrong .feedback-panel__copy strong{color:var(--bad)}.feedback-panel__copy p{margin:0;color:var(--muted);font-size:12px;line-height:1.45;max-width:42ch}.feedback-panel__copy p:before{content:"// "}.feedback-panel__milestone{color:var(--accent)!important}.feedback-next{min-width:164px;min-height:40px;padding:0 18px;border-color:var(--accent);color:var(--accent);font-family:var(--font-display);font-size:13px;font-weight:700;letter-spacing:0;text-transform:uppercase}.feedback-next:hover{background:#b4f34a14}.feedback-next:disabled{border-color:var(--line);color:var(--faint);background:transparent}.feedback-panel.is-wrong .feedback-next{border-color:var(--bad);color:var(--bad)}.feedback-panel.is-wrong .feedback-next:hover{background:#ff4d4d14}.feedback-panel.is-correct .feedback-next{color:var(--accent)}.timeline-panel{display:grid;gap:var(--space-2)}.timeline-row{display:flex;gap:var(--space-2);flex-wrap:wrap}.timeline-cell{width:12px;height:12px;border:var(--border);background:transparent}.timeline-cell.is-hit{background:var(--accent);border-color:var(--accent)}.timeline-cell.is-miss{background:var(--bad);border-color:var(--bad)}.timeline-cell.is-current{border-color:var(--ink)}.stats-sidebar{display:grid;align-content:start}.promo-panel{width:100%;min-width:0}.pack-picker{display:grid;gap:var(--space-2);margin-bottom:var(--space-4)}.pack-picker select{width:100%;min-width:0;min-height:34px;padding:4px 32px 4px 8px;appearance:none;-webkit-appearance:none;border:1px solid var(--line);border-radius:0;background:var(--panel);background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='m1 1 5 5 5-5' fill='none' stroke='white' stroke-width='1.5'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;color:var(--ink);font:inherit;font-size:12px;text-transform:uppercase}.pack-picker select:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.promo-card{display:grid;gap:var(--space-4);align-content:start}.promo-card__cover{justify-self:center;align-self:center;display:inline-flex;width:100%;justify-content:center;background:transparent}.promo-card__art{width:100%;height:auto;aspect-ratio:1;object-fit:contain}.promo-card__copy{display:grid;gap:var(--space-2)}.promo-card__copy strong{font-size:16px;line-height:1.35;text-transform:uppercase}.promo-card__copy small{color:var(--muted);font-size:11px;text-transform:uppercase;letter-spacing:0}.promo-card__buy{display:inline-flex;width:100%;align-items:center;justify-content:center;min-height:0;padding:6px var(--space-5);border:1px solid var(--gs-green);background:var(--gs-green);color:var(--accent-ink);font-family:var(--font-mono);font-size:13px;line-height:1.3;font-weight:700;letter-spacing:0;text-transform:uppercase}.promo-card>.section-label{color:var(--gs-green)}@media(hover:hover)and (pointer:fine){.promo-card__buy:hover{background:transparent;color:var(--gs-green)}}.session-panel,.sidebar-progress{display:grid;gap:var(--space-5)}.session-panel__hero{display:grid;gap:var(--space-3)}.session-panel__score strong{font-size:32px;font-variant-numeric:tabular-nums;line-height:1}.session-panel__score small{color:var(--accent);font-size:12px;font-family:var(--font-mono);text-transform:uppercase;letter-spacing:0}.metrics-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1px;background:var(--line-soft)}.metrics-grid div{min-height:74px;padding:var(--space-4);background:var(--panel-2);display:grid;align-content:space-between;gap:var(--space-2)}.metrics-grid span{color:var(--faint);font-size:9px}.metrics-grid strong,.stat-line strong,.mobile-strip strong,.player-wave__focusline strong{font-family:var(--font-mono);font-size:15px;font-weight:500;letter-spacing:0;font-variant-numeric:tabular-nums}.stat-line span{color:var(--muted);font-size:11px;text-transform:uppercase}.sidebar-progress__row{display:grid;gap:var(--space-2)}.sidebar-progress__message{margin:0 0 var(--space-4);color:var(--muted);font-size:11px;text-transform:uppercase;letter-spacing:0}.sidebar-progress__message:before{content:"// "}.sidebar-progress__row.is-complete .stat-line strong,.sidebar-progress__status{color:var(--accent)}.sidebar-progress__status{font-size:10px;text-transform:uppercase;letter-spacing:0}.keyboard-bar{width:var(--site-width);margin:0 auto;border:var(--border);border-top:0;background:var(--panel);padding:var(--space-4) var(--space-5);display:flex;align-items:center;justify-content:space-between;gap:var(--space-5);font-size:11px}.keyboard-bar__keys{display:flex;gap:var(--space-5);flex-wrap:wrap;color:var(--muted)}kbd{min-width:22px;height:22px;padding:0 6px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--ink);color:var(--ink);font:inherit;margin-right:6px}.kbd--wide{padding:0 10px}.error-banner{width:var(--site-width);margin:16px auto 24px;padding:10px 12px;border:1px solid var(--bad);background:#ff4d4d14;color:var(--ink);font-size:12px;text-transform:uppercase;letter-spacing:0}.ear-gym-guide{width:var(--site-width);margin:var(--space-8) auto 0;border:var(--border);background:var(--ground)}.ear-gym-guide__intro{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:var(--space-6);align-items:end;padding:var(--space-8);border-bottom:var(--border)}.ear-gym-guide__eyebrow,.ear-gym-guide h3,.ear-gym-guide p,.ear-gym-guide li,.ear-gym-guide dt,.ear-gym-guide dd{margin:0}.ear-gym-guide__eyebrow{grid-column:1 / -1;color:var(--accent);font-size:11px;font-weight:700;text-transform:uppercase}.ear-gym-guide h2{margin:0;font-size:clamp(22px,3vw,36px);line-height:1.05}.ear-gym-guide__intro>p:last-child{max-width:58ch;color:var(--muted);font-size:13px;line-height:1.65}.ear-gym-guide__steps,.ear-gym-guide__faq dl{display:grid;grid-template-columns:repeat(3,minmax(0,1fr))}.ear-gym-guide__steps article,.ear-gym-guide__faq dl>div{min-width:0;padding:var(--space-6);border-right:var(--border)}.ear-gym-guide__steps article:last-child,.ear-gym-guide__faq dl>div:last-child{border-right:0}.ear-gym-guide__steps article>span{display:block;margin-bottom:var(--space-8);color:var(--accent);font-size:12px;font-weight:700}.ear-gym-guide h3{font-size:14px;line-height:1.2}.ear-gym-guide__steps p,.ear-gym-guide dd{margin-top:var(--space-3);color:var(--muted);font-size:12px;line-height:1.6}.ear-gym-guide__skills,.ear-gym-guide__faq{padding:var(--space-6);border-top:var(--border)}.ear-gym-guide__skills{display:grid;grid-template-columns:196px minmax(0,1fr);gap:var(--space-6);align-items:start}.ear-gym-guide__skills ul{display:flex;flex-wrap:wrap;gap:var(--space-2);margin:0;padding:0;list-style:none}.ear-gym-guide__skills li{padding:6px 10px;border:var(--border);color:var(--muted);font-size:11px;text-transform:uppercase}.ear-gym-guide__faq>h3{margin-bottom:var(--space-6)}.ear-gym-guide dt{color:var(--ink);font-size:12px;font-weight:700;text-transform:uppercase}button:disabled{cursor:default;opacity:.56}button:focus-visible,input:focus-visible,a:focus-visible{outline:2px solid var(--accent);outline-offset:2px}button:hover:not(:disabled),a:hover{color:var(--ink)}.action-primary:hover:not(:disabled),.segmented button.is-active:hover,.process-toggle .is-active:hover,.stem-tabs .is-active:hover,.remote-load-button:hover{color:var(--accent-ink)}@media(prefers-reduced-motion:reduce){.ab-switch button:not(:disabled):hover{transform:none}.answer-chip:not(:disabled):hover{transform:none}.audio-load-panel__indicator i{transform:translate(0)}*,*:before,*:after{transition:none!important;animation:none!important;scroll-behavior:auto!important}}@media(max-width:900px){:root{--site-width: min(1240px, calc(100vw - 24px) )}.topbar{grid-template-columns:1fr;min-height:auto}.topbar__brandmark,.topbar__tabs,.topbar__meta{min-height:auto;border-right:0;border-bottom:var(--border)}.topbar__tabs{padding:0}.topbar__meta{justify-content:flex-start;padding:var(--space-3) var(--space-5);border-bottom:0}.mobile-strip{display:flex}.app-body{grid-template-columns:1fr}.setup-rail,.round-main{border-right:0;border-bottom:var(--border)}.setup-rail{grid-auto-flow:row}.feedback-panel{grid-template-columns:1fr}.keyboard-bar{display:none}.ear-gym-guide__intro,.ear-gym-guide__skills,.ear-gym-guide__steps,.ear-gym-guide__faq dl{grid-template-columns:1fr}.ear-gym-guide__steps article,.ear-gym-guide__faq dl>div{border-right:0;border-bottom:var(--border)}.ear-gym-guide__steps article:last-child,.ear-gym-guide__faq dl>div:last-child{border-bottom:0}}@media(max-width:520px){:root{--site-width: calc(100vw - 16px) }.topbar{position:sticky;top:0;z-index:20}.topbar__brandmark{padding:var(--space-3) var(--space-4)}.brandmark__copy{font-size:18px}.topbar__tabs{order:4;padding:0}.top-tab{min-height:44px;padding:0 14px}.pack-picker select,.promo-card__buy{min-height:44px}.mobile-strip{position:sticky;top:134px;z-index:19;margin-top:-1px}.setup-rail{display:flex;flex-wrap:wrap}.panel--section{width:100%}.player-panel{gap:var(--space-5);padding:var(--space-5)}.player-panel__top{gap:var(--space-4);flex-direction:column;align-items:stretch}.hero-title{font-size:20px}.ab-switch button{min-height:72px;padding:var(--space-4)}.ab-switch button strong{font-size:19px}.player-controls__row--transport{flex-direction:row;align-items:center}.transport-bar{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}.volume-track{grid-column:1 / -1}.player-controls__row--sources{display:grid;grid-template-columns:44px minmax(0,1fr);gap:8px;align-items:stretch}.player-controls__row--sources .transport__primary{width:44px;min-width:44px;height:44px;padding:0}.source-list--pills{width:100%;padding-bottom:0}.player-controls__row--sources .source-list--pills{display:grid;grid-template-columns:1fr .85fr 1.3fr}.player-controls__row--sources .source-pill{min-width:0;min-height:44px;justify-content:center;padding:0 4px;font-size:10px;letter-spacing:0;gap:4px}.player-controls__row--sources .source-pill__marker{display:none}.player-controls__row--sources .source-pill.is-active{border-bottom-color:var(--accent)}.process-toggle{width:100%}.process-toggle button{min-width:0}.answer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.answer-chip{min-height:154px;padding:var(--space-4);gap:8px}.answer-chip__diagram{height:44px}.answer-chip__diagram svg{height:40px}.answer-chip__title{font-size:13px}.answer-chip__spec,.answer-chip__note{font-size:10px}.action-bar{position:sticky;bottom:0;z-index:18;margin:0 -16px -16px;padding:var(--space-4);background:linear-gradient(to top,var(--ground),rgba(0,0,0,.9),transparent)}.action-secondary,.action-primary{min-height:44px}.session-panel,.sidebar-progress{display:none}.stats-sidebar{border-bottom:0}.promo-card{grid-template-columns:minmax(0,1fr);grid-template-areas:"label" "art" "copy";column-gap:var(--space-4);row-gap:var(--space-2);align-items:start}.promo-card>.section-label{grid-area:label;align-self:end}.promo-card__cover{grid-area:art;align-self:center;justify-self:center}.promo-card__art{width:min(100%,220px);height:auto;display:block;object-fit:contain}.promo-card__copy{grid-area:copy}.ear-gym-guide{margin-top:var(--space-6)}.ear-gym-guide__intro,.ear-gym-guide__steps article,.ear-gym-guide__skills,.ear-gym-guide__faq,.ear-gym-guide__faq dl>div{padding:var(--space-5)}.ear-gym-guide__steps article>span{margin-bottom:var(--space-5)}.ear-gym-guide h2{font-size:22px}}