.sq-tutorial{min-height:100vh;background:var(--bg);color:var(--text);font-family:Geist,system-ui,sans-serif;overflow-x:hidden;--accent:#6500ff;--accent-light:#9d5cff;--accent-dark:#3b00b0;--bg-glow-primary:rgba(101,0,255,.06);--bg-glow-secondary:rgba(0,166,255,.05);--bg-glow-tertiary:rgba(255,0,86,.04)}.sq-header{position:fixed;top:0;left:0;right:0;z-index:100;display:flex;align-items:center;justify-content:flex-end;padding:.875rem 1.5rem;background:rgba(0,0,0,.5);border-bottom:1px solid hsla(0,0%,100%,.08);backdrop-filter:blur(20px)}html[data-theme=light] .sq-header{background:hsla(0,0%,100%,.5);border-bottom:1px solid rgba(0,0,0,.08)}.sq-header-logo-center{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%)}.sq-header-logo{display:inline-flex;align-items:center;text-decoration:none;transition:transform .2s ease}.sq-header-logo:hover{transform:scale(1.05)}.sq-header-logo-img{height:34px;width:auto;display:block;mix-blend-mode:difference}.sq-header-actions{display:flex;align-items:center;gap:.75rem}.sq-header-btn,.sq-home-btn,.sq-theme-toggle{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:50%;border:1px solid var(--border);background:var(--surface);color:var(--text);cursor:pointer;transition:transform .15s ease,background .2s,border-color .2s,color .2s;backdrop-filter:blur(8px)}.sq-header-btn:hover,.sq-home-btn:hover,.sq-theme-toggle:hover{transform:scale(1.08);background:var(--track-bg);border-color:var(--accent);color:var(--accent)}.sq-header-btn:active,.sq-home-btn:active,.sq-theme-toggle:active{transform:scale(.94)}.sq-tutorial{height:100vh;overflow:hidden}.sq-slideshow{position:fixed;inset:0;z-index:1;overflow:hidden}.sq-slideshow-track{display:flex;height:100%;transition:transform .5s cubic-bezier(.25,1,.5,1)}.sq-slide{flex:0 0 100%;width:100%;height:100%;overflow:hidden;display:flex;flex-direction:column}.sq-slide-hero .sq-hero{flex:1;min-height:0;height:100%;padding:6rem 1.5rem 2rem}.sq-slide-scroll{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch;padding:5.5rem 1.5rem 6rem}.sq-slide-content{width:100%;max-width:1200px;margin:0 auto}.sq-hero{position:relative;min-height:100vh;display:flex;flex-direction:column;justify-content:center;align-items:center;padding:7rem 1.5rem 4rem;overflow:hidden;text-align:center;--accent:#00a6ff;--accent-light:#4dc4ff;--accent-dark:#07c}.sq-lesson-card[data-accent=purple]{--accent:#6500ff;--accent-light:#9d5cff;--accent-dark:#3b00b0}.sq-lesson-card[data-accent=pink]{--accent:#ff0056;--accent-light:#ff5c8d;--accent-dark:#b3003d}.sq-lesson-card[data-accent=blue]{--accent:#00a6ff;--accent-light:#4dc4ff;--accent-dark:#07c}.sq-lesson-card[data-accent=magenta]{--accent:#8b0046;--accent-light:#c40066;--accent-dark:#5c002e}.sq-lesson-card[data-accent=orange]{--accent:#f8903a;--accent-light:#fbb984;--accent-dark:#dd6808}.sq-lesson-card[data-accent=module6]{--accent:#8cc0a6;--accent-light:#a8d4c0;--accent-dark:#6fa88c}.sq-lesson-card[data-accent=navy]{--accent:navy;--accent-light:#1a237e;--accent-dark:#00004d}.sq-hero-bg{position:absolute;inset:0;z-index:0;background:radial-gradient(ellipse at 50% 0,var(--bg-glow-primary) 0,transparent 55%),radial-gradient(ellipse at 80% 80%,var(--bg-glow-secondary) 0,transparent 45%),radial-gradient(ellipse at 20% 60%,var(--bg-glow-tertiary) 0,transparent 40%)}.sq-hero-bg:before{content:"";position:absolute;inset:0;z-index:-1;background:url(/assets/hero/sound-quality-bg.jpg) no-repeat 50%/cover;opacity:1}.sq-hero-bg:after{content:"";position:absolute;inset:0;z-index:0;background:radial-gradient(ellipse at 50% 50%,transparent 30%,rgba(0,0,0,.65) 100%);pointer-events:none}html[data-theme=light] .sq-hero-bg:before{opacity:.4}html[data-theme=light] .sq-hero-bg:after{background:radial-gradient(ellipse at 50% 50%,transparent 30%,hsla(0,0%,100%,.55) 100%)}.sq-hero-grid{inset:0;z-index:0;background-image:linear-gradient(var(--border) 1px,transparent 1px),linear-gradient(90deg,var(--border) 1px,transparent 1px);background-size:80px 80px;mask-image:radial-gradient(ellipse at 50% 50%,#000 0,transparent 70%);-webkit-mask-image:radial-gradient(ellipse at 50% 50%,#000 0,transparent 70%)}.sq-hero-grid,.sq-hero-orb{position:absolute;opacity:.35}.sq-hero-orb{border-radius:50%;filter:blur(90px);pointer-events:none;animation:sq-orb-float 16s ease-in-out infinite}.sq-hero-content{position:relative;z-index:1;max-width:900px}.sq-hero-badge{display:inline-flex;align-items:center;gap:.5rem;padding:.5rem 1rem;border-radius:var(--r-full);border:1px solid var(--accent);color:var(--accent);font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;margin-bottom:1.5rem;background:color-mix(in srgb,var(--accent) 8%,transparent)}.sq-hero-title{font-size:clamp(3rem,10vw,7rem);font-weight:800;line-height:.95;letter-spacing:-.05em;margin-bottom:1.5rem;color:var(--text);text-shadow:0 0 100px color-mix(in srgb,var(--accent) 35%,transparent);transform-style:preserve-3d}.sq-hero-subtitle{font-size:clamp(1.1rem,2.5vw,1.5rem);color:var(--muted);margin-bottom:1rem;max-width:650px;margin-left:auto;margin-right:auto;line-height:1.5}.sq-hero-cta-row{display:flex;flex-wrap:wrap;justify-content:center;gap:1rem;margin-top:1.5rem}.sq-hero-cta{display:inline-flex;align-items:center;gap:.625rem;padding:1rem 2.25rem;border-radius:var(--r-full);font-weight:700;font-size:1rem;text-decoration:none;transition:transform .2s ease,box-shadow .2s ease,filter .2s;color:#fff;text-shadow:0 1px 10px rgba(0,0,0,.5);background-size:cover;background-position:50%;border:1px solid hsla(0,0%,100%,.15);position:relative;overflow:hidden}.sq-hero-cta:before{content:"";position:absolute;inset:0;background:rgba(0,0,0,.25);transition:background .2s ease;z-index:0}.sq-hero-cta>*{position:relative;z-index:1}.sq-hero-cta-primary{background-image:url(/assets/cta/priority0.jpg)}.sq-hero-cta-console,.sq-hero-cta-primary{box-shadow:0 0 40px color-mix(in srgb,var(--accent) 35%,transparent)}.sq-hero-cta-console{background-image:url(/assets/cta/priority1.jpg)}.sq-hero-cta:hover{transform:translateY(-3px) scale(1.03);filter:brightness(1.15) saturate(1.1)}.sq-hero-cta:hover:before{background:rgba(0,0,0,.15)}.sq-hero-cta:active{transform:translateY(-1px) scale(.98)}.sq-section{position:relative;padding:4rem 1.5rem;max-width:1200px;margin:0 auto}.sq-section-narrow{max-width:980px}.sq-lesson-card{position:relative;margin-bottom:4rem;border-radius:var(--r-xl);background:var(--surface);border:1px solid var(--border);overflow:hidden;transform-style:preserve-3d;transition:box-shadow .3s ease;box-shadow:0 24px 80px rgba(0,0,0,.25)}.sq-lesson-card:hover{box-shadow:0 36px 100px rgba(0,0,0,.35)}.sq-lesson-card:focus-visible{outline:2px solid var(--accent);outline-offset:4px}.sq-lesson-glow{position:absolute;inset:-1px;z-index:0;border-radius:var(--r-xl);background:linear-gradient(135deg,color-mix(in srgb,var(--accent) 15%,transparent),transparent 40%,transparent 60%,color-mix(in srgb,var(--accent) 10%,transparent));opacity:0;transition:opacity .3s ease;pointer-events:none}.sq-lesson-card:hover .sq-lesson-glow{opacity:1}.sq-lesson-hero{position:relative;z-index:1;min-height:320px;display:flex;flex-direction:column;justify-content:flex-end;padding:2.5rem;background-size:cover;background-position:50%;border-bottom:1px solid var(--border);overflow:hidden}.sq-lesson-hero:before{content:"";position:absolute;inset:0;background:rgba(0,0,0,.1);z-index:1}.sq-lesson-hero:after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 30%,rgba(0,0,0,.55));z-index:2}.sq-lesson-hero-content{position:relative;z-index:3}.sq-lesson-number{display:inline-flex;align-items:center;gap:.5rem;padding:.4rem 1rem;border-radius:var(--r-full);border:1px solid hsla(0,0%,100%,.5);color:#fff;font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;margin-bottom:1rem;background:rgba(0,0,0,.25);width:-moz-fit-content;width:fit-content}.sq-lesson-title{font-size:clamp(2rem,5vw,3.25rem);font-weight:800;color:#fff;margin-bottom:.5rem;line-height:1.05;text-shadow:0 2px 24px rgba(0,0,0,.55)}.sq-lesson-subtitle{font-size:1.15rem;color:#fff;font-weight:500;text-shadow:0 1px 12px rgba(0,0,0,.5);opacity:.95}.sq-lesson-body{position:relative;z-index:1;padding:2.5rem}.sq-grid{display:grid;grid-template-columns:1fr;gap:1.5rem;margin-bottom:1.5rem}@media (min-width:768px){.sq-grid{grid-template-columns:1fr 1fr}.sq-grid-3{grid-template-columns:repeat(3,1fr)}}.sq-content-block{padding:1.5rem;border-radius:var(--r-md);background:var(--track-bg);border:1px solid var(--track-border);transition:border-color .2s,background .2s}.sq-content-block:hover{border-color:var(--border-hover)}.sq-content-block h4{color:var(--accent);margin-bottom:.875rem;font-size:1.05rem;font-weight:700}.sq-content-block li,.sq-content-block p{color:var(--muted);line-height:1.65;font-size:.95rem}.sq-content-block ul{list-style-position:inside;margin-bottom:.5rem}.sq-content-block li{margin-bottom:.75rem}.sq-content-block li strong{color:var(--text);font-weight:600}.sq-table-responsive{overflow-x:auto;border-radius:var(--r-md);border:1px solid var(--track-border);margin:1.25rem 0}.sq-table{width:100%;border-collapse:collapse;text-align:left;font-size:.9rem}.sq-table td,.sq-table th{padding:.875rem 1rem;border-bottom:1px solid var(--track-border)}.sq-table th{background:var(--track-bg);color:var(--accent);font-weight:700;font-size:.8rem;text-transform:uppercase;letter-spacing:.05em}.sq-table tr:last-child td{border-bottom:none}.sq-table td{color:var(--muted)}.sq-table td strong{color:var(--text)}.sq-diagram{width:100%;max-height:240px;border-radius:var(--r-md);background:var(--surface);border:1px solid var(--border);padding:1rem;margin:1.5rem 0;display:block}@media (max-width:768px){.sq-diagram{max-height:180px;padding:.75rem}}.sq-demo-box{padding:1.5rem;border-radius:var(--r-md);border:1px dashed var(--accent);background:color-mix(in srgb,var(--accent) 5%,transparent);margin-top:1.5rem}.sq-demo-box h5{display:inline-flex;align-items:center;gap:.5rem;color:var(--accent);font-size:.8rem;font-weight:800;text-transform:uppercase;letter-spacing:.06em;margin-bottom:.625rem}.sq-demo-box p{color:var(--muted);line-height:1.65;font-size:.95rem}.sq-flow{display:flex;flex-direction:column;gap:1rem;padding:1.5rem;border-radius:var(--r-md);background:var(--track-bg);border:1px solid var(--track-border);margin:1.5rem 0}@media (min-width:768px){.sq-flow{flex-direction:row;align-items:center;justify-content:space-between;flex-wrap:wrap}}.sq-flow-node{padding:.875rem 1.25rem;border-radius:var(--r-sm);border:1px solid var(--accent);background:var(--surface);color:var(--text);font-weight:600;text-align:center;flex:1;min-width:120px;transition:transform .2s,box-shadow .2s}.sq-flow-node:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,.15)}.sq-flow-node.success{border-color:#22c55e;background:rgba(34,197,94,.08)}.sq-flow-node.warning{border-color:var(--gold);background:rgba(255,183,0,.06)}.sq-flow-arrow{text-align:center;color:var(--muted);font-weight:700;font-size:1.2rem}@media (min-width:768px){.sq-flow-arrow:after{content:"→"}}@media (max-width:767px){.sq-flow-arrow:after{content:"↓"}}.sq-quote{border-left:4px solid var(--gold);background:rgba(255,183,0,.05);padding:1rem 1.25rem;border-radius:0 var(--r-md) var(--r-md) 0;font-style:italic;margin:1.5rem 0;color:var(--muted)}.sq-quote strong{color:var(--text);font-style:normal}.sq-tree-root{display:inline-block;padding:.5rem 1rem;border-radius:var(--r-sm);background:color-mix(in srgb,var(--accent) 10%,transparent);color:var(--accent);font-weight:700;margin-top:1.25rem}.sq-tree-root.warning{background:rgba(255,183,0,.1);color:var(--gold)}.sq-tree-root.success{background:rgba(34,197,94,.1);color:#22c55e}.sq-tree-node{margin-left:1.5rem;border-left:2px solid var(--border);padding-left:1rem;margin-top:.5rem;color:var(--muted)}.sq-tree-node strong{color:var(--text)}.sq-divider{text-align:center;margin:4rem 0;font-size:1rem;letter-spacing:.3em;color:var(--muted);text-transform:uppercase;font-weight:700;position:relative}.sq-divider:after,.sq-divider:before{content:"";display:inline-block;width:60px;height:1px;background:var(--border);vertical-align:middle;margin:0 1rem}@media (min-width:768px){.sq-divider:after,.sq-divider:before{width:120px}}.sq-divider.instructor{color:var(--purple)}.sq-mermaid{background:var(--surface);padding:1.5rem;border-radius:var(--r-md);border:1px solid var(--border);margin-bottom:2rem;overflow-x:auto;text-align:center}.sq-bonus-card{border-left:4px solid var(--accent)}.sq-glossary-list{display:grid;grid-template-columns:1fr;gap:1rem}@media (min-width:768px){.sq-glossary-list{grid-template-columns:1fr 1fr}}.sq-glossary-item{padding:1rem 1.25rem;border-radius:var(--r-md);background:var(--track-bg);border:1px solid var(--track-border);transition:border-color .2s ease,transform .2s ease}.sq-glossary-item:hover{border-color:var(--accent);transform:translateY(-2px)}.sq-glossary-item strong{color:var(--accent);font-weight:700;font-size:1rem;display:block;margin-bottom:.25rem}.sq-glossary-item abbr{text-decoration:none;cursor:help;border-bottom:1px dashed var(--accent)}.sq-glossary-item p{color:var(--muted);font-size:.9rem;line-height:1.6;margin:0}.sq-nav{position:fixed;bottom:1.5rem;right:1.5rem;display:flex;flex-direction:row;gap:.625rem;z-index:90}.sq-nav-btn{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:50%;border:1px solid var(--border);background:var(--surface);color:var(--text);cursor:pointer;transition:transform .15s ease,background .2s,color .2s,border-color .2s;box-shadow:0 4px 24px rgba(0,0,0,.2);-webkit-tap-highlight-color:transparent}.sq-nav-btn:hover{transform:translateY(-2px);background:var(--accent);border-color:var(--accent);color:#000}.sq-nav-btn:active{transform:scale(.92)}.sq-haptic{transition:transform .15s ease;-webkit-tap-highlight-color:transparent}.sq-haptic:hover{transform:scale(1.015)}.sq-haptic:active{transform:scale(.985)}@media (pointer:coarse){.sq-haptic:hover{transform:none}.sq-haptic:active{transform:scale(.96)}}.sq-focusable:focus-visible{outline:2px solid var(--accent);outline-offset:3px}@keyframes sq-orb-float{0%,to{transform:translateY(0) rotate(0deg)}50%{transform:translateY(-40px) rotate(180deg)}}@keyframes sq-fade-up{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}@keyframes sq-bounce{0%,20%,50%,80%,to{transform:translateY(0)}40%{transform:translateY(-12px)}60%{transform:translateY(-6px)}}.sq-animate{animation:sq-fade-up .7s ease forwards}.sq-progress{position:fixed;bottom:1.5rem;left:50%;transform:translateX(-50%);display:flex;align-items:center;gap:.625rem;z-index:90;padding:.5rem 1rem;border-radius:var(--r-full);background:var(--surface);border:1px solid var(--border);box-shadow:0 4px 24px rgba(0,0,0,.2)}.sq-progress-dot{width:10px;height:10px;border-radius:50%;border:none;padding:0;background:var(--border);cursor:pointer;transition:background .2s,transform .2s}.sq-progress-dot.active{background:var(--accent);transform:scale(1.3)}.sq-keyboard-hint{position:fixed;bottom:1.5rem;left:1.5rem;display:flex;align-items:center;gap:.625rem;padding:.625rem 1rem;border-radius:var(--r-full);background:var(--surface);border:1px solid var(--border);color:var(--muted);font-size:.75rem;font-weight:500;z-index:90;box-shadow:0 4px 24px rgba(0,0,0,.15)}.sq-keyboard-hint kbd{display:inline-flex;align-items:center;justify-content:center;min-width:24px;height:24px;padding:0 .5rem;border-radius:4px;background:var(--track-bg);border:1px solid var(--track-border);color:var(--text);font-family:inherit;font-weight:700;font-size:.75rem}@media (max-width:768px){.sq-header{padding:.75rem 1rem}.sq-hero{padding:6rem 1rem 3rem;min-height:auto}.sq-slide-hero .sq-hero{padding:5rem 1rem 2rem}.sq-slide-scroll{padding:5rem 1rem 5.5rem}.sq-section{padding:2.5rem 1rem}.sq-lesson-hero{min-height:260px;padding:1.5rem}.sq-lesson-body{padding:1.5rem}.sq-nav{bottom:1rem;right:1rem}.sq-nav-btn{width:40px;height:40px}.sq-progress{bottom:1rem;padding:.375rem .75rem}.sq-progress-dot{width:8px;height:8px}.sq-keyboard-hint{display:none}.sq-divider:after,.sq-divider:before{width:30px}}@media (prefers-reduced-motion:reduce){.sq-animate,.sq-flow-node,.sq-haptic,.sq-hero-cta,.sq-hero-orb,.sq-lesson-card,.sq-nav-btn{animation:none;transition:none;transform:none}}@media print{.sq-header,.sq-hero,.sq-keyboard-hint,.sq-nav,.sq-progress{display:none!important}.sq-tutorial{background:#fff;color:#111}.sq-slideshow,.sq-tutorial{height:auto;overflow:visible}.sq-slideshow{position:static}.sq-slideshow-track{transform:none!important;transition:none!important;flex-direction:column;width:100%;height:auto}.sq-slide{flex:none;width:100%}.sq-slide,.sq-slide-scroll{height:auto;overflow:visible}.sq-section,.sq-slide-scroll{padding:1rem 0}.sq-section{max-width:none}.sq-lesson-card{-moz-column-break-inside:avoid;break-inside:avoid;page-break-inside:avoid;box-shadow:none;border:1px solid #ddd;margin-bottom:2rem}.sq-lesson-hero{min-height:200px;-webkit-print-color-adjust:exact;print-color-adjust:exact}.sq-lesson-body{padding:1.5rem}.sq-content-block{border:1px solid #eee}.sq-content-block,.sq-mermaid{-moz-column-break-inside:avoid;break-inside:avoid;page-break-inside:avoid}}