@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700;800&family=IBM+Plex+Mono:wght@400;500;600&display=swap');:root{--bg:#252721;--panel:#30332b;--cream:#eee9dc;--muted:#bcb9ad;--line:#585c50;--accent:#db8b60}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--cream);font-family:'DM Sans',Arial,sans-serif}a{color:inherit;text-decoration:none}.wrap{width:min(1110px,calc(100% - 72px));margin:auto}.top{border-bottom:1px solid var(--line)}.nav{height:78px;display:flex;justify-content:space-between;align-items:center}.logo{font-weight:800;font-size:27px;letter-spacing:-1.5px}.logo span{color:var(--accent)}.logo small{font:500 11px 'IBM Plex Mono',monospace;letter-spacing:3px;margin-left:7px;color:#ccc9be}.nav nav{display:flex;gap:36px;font-size:13px;color:#d5d0c4}.nav a:hover,.linkarrow:hover{color:var(--accent)}.intro{padding-top:90px;padding-bottom:105px}.introline,.section-index,.photo-label,.caption,.stripe-inner,.fine,.signature,.foot{font-family:'IBM Plex Mono',monospace}.introline,.section-index{font-size:11px;letter-spacing:1.1px;color:var(--accent)}.introgrid{display:grid;grid-template-columns:.82fr 1.18fr;gap:75px;align-items:center;margin-top:40px}.intro h1{font-size:clamp(54px,6vw,88px);line-height:1.03;letter-spacing:-4px;margin:0 0 35px;font-weight:800}.intro p{color:var(--muted);font-size:16px;line-height:1.8;max-width:410px}.intro .lead{font-size:20px;color:var(--cream);font-weight:600;line-height:1.5}.linkarrow{display:inline-flex;gap:28px;align-items:center;border-bottom:1px solid var(--accent);padding-bottom:10px;margin-top:22px;font-size:15px;font-weight:700}.linkarrow span{color:var(--accent);font-size:22px}.photo-frame{padding:14px;background:#191b18;border:1px solid #55594f;box-shadow:14px 14px 0 #1d201b}.photo-label{font-size:10px;letter-spacing:1px;color:#b8b8aa;margin:5px 4px 15px}.photo-frame img{display:block;width:100%;height:auto}.caption{font-size:10px;color:#aeb0a4;margin:15px 4px 4px;line-height:1.5}.stripe{background:#d5c7ad;color:#282a24}.stripe-inner{display:flex;justify-content:space-between;gap:20px;padding-top:17px;padding-bottom:17px;font-size:10px;letter-spacing:1px;font-weight:600}.product{padding-top:105px;padding-bottom:120px}.product-grid{display:grid;grid-template-columns:1fr 1fr;gap:95px;margin-top:30px}.product h2{font-size:clamp(85px,11vw,155px);letter-spacing:-10px;line-height:1;margin:0;color:var(--accent)}.product h3{font-size:27px;margin:18px 0 50px;letter-spacing:-.7px}.statement{font-size:clamp(27px,3vw,42px);font-weight:700;letter-spacing:-1px;line-height:1.2}.description p{font-size:16px;line-height:1.9;color:#d0cfc3;margin:0 0 23px}.specs{border-top:1px solid var(--line);border-bottom:1px solid var(--line);display:grid;grid-template-columns:repeat(3,1fr);gap:10px;padding:24px 0;margin-top:35px}.specs div{display:flex;flex-direction:column;gap:6px}.specs b{font-size:23px}.specs span{font-size:11px;color:var(--muted);line-height:1.5}.buttons{display:flex;flex-wrap:wrap;gap:12px;margin-top:27px}.btn{display:flex;flex-direction:column;gap:5px;padding:14px 18px;background:var(--accent);color:#24251f;font-weight:800;font-size:14px}.btn small{font-size:10px;font-weight:500}.btn-light{background:transparent;color:var(--cream);border:1px solid #999a8e}.disabled{opacity:.65;cursor:not-allowed}.description .fine{font-size:10px;color:#a8aa9e;margin-top:18px}.about{background:#33362e;border-top:1px solid #515549;border-bottom:1px solid #515549;padding:105px 0}.aboutgrid{display:grid;grid-template-columns:1fr 2fr;gap:50px}.about h2{font-size:clamp(38px,4vw,55px);letter-spacing:-2px;line-height:1.1;margin:0 0 30px}.about p{max-width:720px;color:#d2d1c6;font-size:17px;line-height:1.85}.about .signature{font-size:12px;color:var(--accent);margin-top:35px}.next{padding-top:105px;padding-bottom:105px}.nextgrid{display:grid;grid-template-columns:1fr 1fr;gap:90px;align-items:center;margin-top:25px}.next h2{font-size:60px;letter-spacing:-3px;margin:0 0 12px}.next h2 span{font:500 10px 'IBM Plex Mono',monospace;letter-spacing:1px;color:var(--accent);display:inline-block;vertical-align:middle;border:1px solid #9b7b64;padding:9px;margin-left:15px}.next h3{font-size:22px;margin:0;font-weight:500}.next p{font-size:16px;line-height:1.85;color:var(--muted)}.support{display:grid;grid-template-columns:1fr 1fr;gap:70px;padding-bottom:100px}.support .rule{grid-column:1/-1;border-top:1px solid var(--line)}.support strong{font:600 11px 'IBM Plex Mono',monospace;letter-spacing:1px;color:var(--accent)}.support p{color:var(--muted);font-size:13px;line-height:1.85}.footer{border-top:1px solid var(--line);padding:30px 0}.foot{display:flex;justify-content:space-between;align-items:center;gap:15px;font-size:11px;color:var(--muted)}.foot .logo{font-family:'DM Sans',sans-serif;color:var(--cream)}@media(max-width:850px){.introgrid,.product-grid,.aboutgrid,.nextgrid{grid-template-columns:1fr;gap:35px}.intro{padding-top:65px}.intro h1{font-size:65px}.photo-frame{max-width:700px}.product h2{font-size:100px}.product h3{margin-bottom:22px}.about{padding:75px 0}.next{padding:75px 0}}@media(max-width:550px){.wrap{width:calc(100% - 40px)}.nav{height:68px}.nav nav{gap:14px;font-size:11px}.logo{font-size:23px}.logo small{font-size:9px;letter-spacing:1px}.intro h1{font-size:54px;letter-spacing:-2px}.intro{padding-bottom:65px}.stripe-inner{flex-wrap:wrap}.stripe-inner span:last-child{display:none}.product{padding-top:70px;padding-bottom:75px}.product h2{font-size:85px}.specs{grid-template-columns:repeat(3,1fr)}.specs b{font-size:18px}.next h2{font-size:47px}.next h2 span{margin-left:0}.support{grid-template-columns:1fr;gap:20px}.foot{flex-wrap:wrap}.foot>span:nth-child(2){display:none}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
/* Stacked R4GS Audio wordmark */
.logo{display:inline-flex;flex-direction:column;align-items:flex-start;justify-content:center;line-height:1;gap:5px;text-decoration:none;white-space:nowrap}.logo-main{display:block;font-size:27px;letter-spacing:-1.5px;font-weight:800;color:var(--cream)}.logo .logo-main span{color:var(--accent)}.logo small{display:block;margin-left:2px;font:500 10px "IBM Plex Mono",monospace;letter-spacing:4.2px;color:#ccc9be}.logo:hover .logo-main{color:var(--cream)}

/* R4GS Audio stacked wordmark */
.logo{display:inline-flex!important;flex-direction:column!important;align-items:flex-start!important;justify-content:center!important;gap:0!important;line-height:1!important;white-space:nowrap!important;text-decoration:none!important}
.logo .logo-main{display:block!important;font-size:1em;line-height:1!important}
.logo small{display:block!important;margin:4px 0 0 2px!important;letter-spacing:4px!important;font-size:10px!important;line-height:1!important;color:var(--accent)!important;font-weight:700!important}

/* BU-01 practical guide */
.howto{background:#e5dfd0;color:#242620;padding:85px 0 90px}.howto .section-index{color:#9b4c2b}.howto-intro{max-width:740px;margin:16px 0 38px}.howto h2{font-size:clamp(36px,4vw,56px);line-height:1.12;margin:0 0 15px}.howto-intro p{font-size:17px;line-height:1.7;color:#53574f}.howto-layout{display:grid;grid-template-columns:1.15fr 1fr;gap:55px;border-top:1px solid #b9b5a8;padding-top:28px}.howto h3{font-size:23px;margin:0 0 22px}.steps{padding-left:24px;margin:0}.steps li{padding:0 0 16px 8px;line-height:1.65;color:#4c5049}.steps li::marker{font-weight:700;color:#b45e3b}.steps b{color:#242620}.guide-note{border-left:3px solid #ba6038;padding:13px 18px;background:#d8d2c3;font-weight:600;line-height:1.6}.guide-controls{background:#d9d4c6;padding:26px 30px}.guide-controls dl{margin:0}.guide-controls dt{font-size:12px;font-weight:800;letter-spacing:1px;margin:18px 0 4px;color:#8f4629}.guide-controls dd{margin:0;color:#4c5049;line-height:1.65;font-size:14px}.guide-examples{margin-top:55px}.example-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}.example-grid>div{border-top:2px solid #b45e3b;padding-top:16px}.example-grid b{font-size:12px;letter-spacing:1px}.example-grid p{font-size:14px;line-height:1.7;color:#4c5049}.guide-details{margin-top:35px;border-top:1px solid #b9b5a8;border-bottom:1px solid #b9b5a8}.guide-details summary{padding:20px 0;cursor:pointer;font-weight:800;display:flex;justify-content:space-between}.guide-details summary span{color:#b45e3b}.guide-details>div{max-width:760px;padding-bottom:20px;color:#4c5049;line-height:1.7}@media(max-width:800px){.howto-layout{grid-template-columns:1fr;gap:25px}.example-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:500px){.howto{padding:55px 0}.example-grid{grid-template-columns:1fr}.guide-controls{padding:20px}}

/* Multi-page product navigation */
.logo-main span{display:none}
.page-intro{padding-top:75px;padding-bottom:45px}
.page-intro h1{font-size:clamp(65px,10vw,135px);line-height:1;margin:24px 0 10px;letter-spacing:-.055em}
.page-intro .lead{font-size:clamp(24px,3vw,42px);font-weight:700;margin:0 0 20px}
.page-intro>p:not(.lead){max-width:720px;line-height:1.8}
.page-intro .photo-frame{margin-top:40px}
.backlink{display:inline-block;margin-bottom:36px;text-decoration:underline;text-underline-offset:5px}
.overview-products{padding-top:85px;padding-bottom:100px}
.overview-card{display:grid;grid-template-columns:1fr 1fr;gap:45px;padding:42px 0;border-bottom:1px solid #8886;align-items:center}
.overview-card h2{font-size:clamp(45px,6vw,78px);margin:10px 0 0;letter-spacing:-.05em}
.overview-card h3{font-size:24px;margin:0 0 20px}
.overview-card p{max-width:540px;line-height:1.75}
.overview-card img{width:100%;height:auto}
.overview-card .btn{display:inline-block;margin-top:20px}
.upcoming-panel{min-height:280px;background:#20221e;display:flex;align-items:center;justify-content:center;flex-direction:column;border:1px solid #5556}
.upcoming-panel span{font-size:clamp(50px,7vw,100px);font-weight:800;opacity:.25}
.upcoming-panel small{letter-spacing:.2em}
.td-page{min-height:70vh;padding-bottom:100px}
.td-page>p{max-width:690px}
.td-notice{max-width:700px;padding:24px;border:1px solid #7776;margin:35px 0}
@media(max-width:750px){.overview-card{grid-template-columns:1fr;gap:25px}.overview-products{padding-top:55px;padding-bottom:65px}.page-intro{padding-top:45px}}