.rs-qba{background:#090907;color:#eee9df;min-height:80vh;padding-bottom:80px}.rs-qba *{box-sizing:border-box}.rs-qba__shell{width:min(1180px,calc(100% - 36px));margin:0 auto}.rs-qba__hero{padding:64px 0 54px;background:radial-gradient(circle at 82% 22%,rgba(205,162,78,.13),transparent 34%),linear-gradient(180deg,#12100c,#090907)}.rs-qba__back{display:inline-flex;color:#d7b15d;text-decoration:none;font-size:13px;font-weight:700;letter-spacing:.04em;margin-bottom:28px}.rs-qba__hero-grid{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(300px,.6fr);gap:48px;align-items:center}.rs-qba__kicker{display:block;color:#d8ae55;font-size:11px;font-weight:800;letter-spacing:.16em;margin-bottom:10px}.rs-qba h1,.rs-qba h2,.rs-qba h3{margin:0;color:#f4efe5}.rs-qba h1{font-family:Georgia,'Times New Roman',serif;font-size:clamp(42px,5vw,70px);line-height:1.02;max-width:880px}.rs-qba h2{font-family:Georgia,'Times New Roman',serif;font-size:clamp(30px,3vw,46px);line-height:1.08}.rs-qba__hero p{max-width:780px;color:#c9c4bb;font-size:16px;line-height:1.7;margin:20px 0 0}.rs-qba__brand{border:1px solid rgba(215,177,93,.34);border-radius:24px;padding:34px;min-height:250px;display:flex;flex-direction:column;align-items:center;justify-content:center;background:linear-gradient(145deg,rgba(40,34,25,.86),rgba(13,13,11,.92));box-shadow:0 20px 60px rgba(0,0,0,.25)}.rs-qba__brand img{display:block;max-width:100%;max-height:92px;object-fit:contain}.rs-qba__hero-actions{display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin-top:28px}.rs-qba__hero-actions span{font-size:12px;color:#938b7e}.rs-qba__btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 22px;border:1px solid rgba(215,177,93,.38);border-radius:999px;text-decoration:none;color:#f1eadb;font-weight:800;font-size:12px;letter-spacing:.04em}.rs-qba__btn--gold{background:linear-gradient(135deg,#f1cf72,#c99a3b);color:#17130d;border-color:transparent}.rs-qba__section{padding:64px 0;border-top:1px solid rgba(215,177,93,.14)}.rs-qba__section-head{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:26px}.rs-qba__section-head b{display:inline-flex;align-items:center;justify-content:center;min-width:44px;height:34px;border:1px solid rgba(215,177,93,.28);border-radius:999px;color:#d8ae55}.rs-qba__empty{padding:32px;border:1px solid rgba(215,177,93,.22);border-radius:20px;background:rgba(255,255,255,.025)}.rs-qba__empty strong{display:block;font-size:18px;line-height:1.55;color:#eae3d8;max-width:860px}.rs-qba__empty p,.rs-qba__note{color:#9d968b;line-height:1.65}.rs-qba__empty p{max-width:900px;margin:12px 0 0}.rs-qba__empty-actions{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-top:22px}.rs-qba__empty-actions span{max-width:620px;color:#817a6f;font-size:12px;line-height:1.55}.rs-qba__decor-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.rs-qba__decor{overflow:hidden;border:1px solid rgba(215,177,93,.22);border-radius:18px;background:#11100d}.rs-qba__decor-media{position:relative;aspect-ratio:4/3;padding:12px;background:radial-gradient(circle at 50% 36%,rgba(215,177,93,.10),transparent 48%),#0c0b09;display:flex;align-items:center;justify-content:center;color:#6f6657;overflow:hidden;text-decoration:none;cursor:zoom-in}.rs-qba__decor-media img{width:100%;height:100%;display:block;object-fit:contain;object-position:center;border-radius:11px;background:#0c0b09;transition:transform .2s ease,filter .2s ease}.rs-qba__decor-media:hover img{transform:scale(1.012);filter:brightness(1.035)}.rs-qba__decor-media--empty{cursor:default}.rs-qba__zoom{position:absolute;top:22px;right:22px;z-index:2;width:36px;height:36px;display:grid;place-items:center;border:1px solid rgba(244,239,229,.30);border-radius:999px;background:rgba(9,9,7,.72);box-shadow:0 8px 24px rgba(0,0,0,.25);color:#f4efe5;font-size:22px;font-weight:300;line-height:1;opacity:.9;transition:transform .2s ease,background .2s ease}.rs-qba__decor-media:hover .rs-qba__zoom{transform:scale(1.06);background:rgba(9,9,7,.9)}body.rs-qba-lightbox-open{overflow:hidden}.rs-qba-lightbox[hidden]{display:none!important}.rs-qba-lightbox{position:fixed;inset:0;z-index:999999;display:grid;place-items:center;padding:24px;background:rgba(4,4,3,.94);backdrop-filter:blur(10px);opacity:0;transition:opacity .16s ease}.rs-qba-lightbox.is-open{opacity:1}.rs-qba-lightbox__panel{position:relative;width:min(96vw,1600px);height:min(92vh,1100px);display:grid;place-items:center}.rs-qba-lightbox__figure{width:100%;height:100%;margin:0;display:grid;grid-template-rows:minmax(0,1fr) auto;gap:12px;align-items:center;justify-items:center}.rs-qba-lightbox__image{display:block;max-width:100%;max-height:calc(92vh - 54px);width:auto;height:auto;object-fit:contain;border-radius:14px;box-shadow:0 30px 90px rgba(0,0,0,.55)}.rs-qba-lightbox__caption{min-height:24px;color:#ded5c7;font-size:13px;letter-spacing:.02em;text-align:center}.rs-qba-lightbox__close{position:absolute;z-index:3;top:0;right:0;width:46px;height:46px;border:1px solid rgba(255,255,255,.25);border-radius:999px;background:rgba(10,10,8,.82);color:#fff;font-size:30px;line-height:1;cursor:pointer}.rs-qba-lightbox__close:hover{background:#171510}.rs-qba-lightbox__close:focus-visible{outline:2px solid #f0cf73;outline-offset:3px}.rs-qba__decor-body{padding:18px}.rs-qba__decor-body small{color:#d8ae55;font-weight:800;letter-spacing:.08em}.rs-qba__decor-body h3{font-size:24px;margin:8px 0 10px}.rs-qba__decor-body p{color:#aca59a;line-height:1.55}.rs-qba__decor-meta{color:#ddd2bf;font-size:12px;border-top:1px solid rgba(215,177,93,.12);padding-top:12px}.rs-qba__usage{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin-top:26px}.rs-qba__usage span{padding:20px;border:1px solid rgba(215,177,93,.18);border-radius:16px;background:rgba(255,255,255,.02);font-weight:700}.rs-qba__steps{list-style:none;padding:0;margin:28px 0 0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.rs-qba__steps li{padding:22px;border:1px solid rgba(215,177,93,.18);border-radius:16px;background:#0f0e0b}.rs-qba__steps b{display:block;color:#d8ae55;font-size:13px;margin-bottom:12px}.rs-qba__steps span{color:#c8c1b6;line-height:1.55}.rs-qba__final{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}.rs-qba__project{display:grid;grid-template-columns:.8fr 1.2fr;gap:22px;align-items:stretch}.rs-qba__project-copy{padding:30px;border:1px solid rgba(215,177,93,.2);border-radius:18px;background:#0f0e0b}.rs-qba__project-copy p{color:#b8b1a7;line-height:1.65}.rs-qba__project-media{display:grid;grid-template-columns:1fr 1fr;gap:10px}.rs-qba__project-media img{width:100%;height:100%;min-height:280px;object-fit:cover;border-radius:16px}.rs-qba a:focus-visible{outline:2px solid #f0cf73;outline-offset:3px}@media(max-width:900px){.rs-qba__hero-grid,.rs-qba__project{grid-template-columns:1fr}.rs-qba__brand{min-height:190px}.rs-qba__decor-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.rs-qba__usage,.rs-qba__steps{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:640px){.rs-qba-lightbox{padding:12px}.rs-qba-lightbox__close{top:4px;right:4px}.rs-qba__decor-media{padding:8px}.rs-qba__zoom{top:16px;right:16px}.rs-qba__shell{width:min(100% - 24px,1180px)}.rs-qba__hero{padding:42px 0 38px}.rs-qba h1{font-size:40px}.rs-qba__hero-grid{gap:28px}.rs-qba__brand{padding:24px}.rs-qba__section{padding:44px 0}.rs-qba__decor-grid,.rs-qba__usage,.rs-qba__steps,.rs-qba__project-media{grid-template-columns:1fr}.rs-qba__project-media img{min-height:220px}.rs-qba__hero-actions,.rs-qba__final,.rs-qba__empty-actions{align-items:stretch}.rs-qba__btn{width:100%}.rs-qba__empty-actions span{padding:0 4px}}


/* QBS7.5 — navigable lightbox carousel: keyboard arrows, mouse controls and touch swipe. */
.rs-qba-lightbox__nav[hidden]{display:none!important}
.rs-qba-lightbox__panel{padding:0 78px}
.rs-qba-lightbox__nav{position:absolute;z-index:4;top:50%;width:58px;height:58px;display:grid;place-items:center;transform:translateY(-50%);border:1px solid rgba(240,207,115,.38);border-radius:999px;background:rgba(10,10,8,.78);color:#f5ead2;box-shadow:0 14px 44px rgba(0,0,0,.38);cursor:pointer;transition:transform .18s ease,background .18s ease,border-color .18s ease,box-shadow .18s ease;backdrop-filter:blur(8px)}
.rs-qba-lightbox__nav span{display:block;margin-top:-4px;font:300 48px/1 Georgia,'Times New Roman',serif}
.rs-qba-lightbox__nav--prev{left:4px}.rs-qba-lightbox__nav--next{right:4px}
.rs-qba-lightbox__nav:hover{transform:translateY(-50%) scale(1.06);background:rgba(27,23,16,.96);border-color:rgba(240,207,115,.72);box-shadow:0 18px 52px rgba(0,0,0,.48),0 0 22px rgba(215,177,93,.08)}
.rs-qba-lightbox__nav:focus-visible{outline:2px solid #f0cf73;outline-offset:3px}
.rs-qba-lightbox__caption{display:flex;align-items:center;justify-content:center;gap:14px;flex-wrap:wrap}
.rs-qba-lightbox__counter{display:inline-flex;align-items:center;justify-content:center;min-width:54px;height:26px;padding:0 10px;border:1px solid rgba(215,177,93,.22);border-radius:999px;color:#d7b15d;font-size:11px;font-weight:800;letter-spacing:.06em}
.rs-qba-lightbox__image{transition:opacity .105s ease,transform .105s ease}.rs-qba-lightbox__image.is-changing{opacity:.34;transform:scale(.992)}
@media(max-width:900px){.rs-qba-lightbox__panel{padding:0 54px}.rs-qba-lightbox__nav{width:48px;height:48px}.rs-qba-lightbox__nav span{font-size:40px}}
@media(max-width:640px){.rs-qba-lightbox__panel{padding:0 0 68px}.rs-qba-lightbox__nav{top:auto;bottom:8px;width:48px;height:48px;transform:none}.rs-qba-lightbox__nav--prev{left:calc(50% - 58px)}.rs-qba-lightbox__nav--next{right:calc(50% - 58px)}.rs-qba-lightbox__nav:hover{transform:scale(1.04)}.rs-qba-lightbox__caption{gap:8px}.rs-qba-lightbox__counter{height:24px;min-width:50px}}
@media(prefers-reduced-motion:reduce){.rs-qba-lightbox__nav,.rs-qba-lightbox__image{transition:none!important}}


/* QBS7.7 — fast cross-brand navigation inside every quartz collection. */
.rs-qba__section-head{align-items:center}
.rs-qba__section-head h2{flex:1 1 auto;min-width:0}
.rs-qba__brand-switcher{display:flex;align-items:center;justify-content:flex-end;gap:10px;margin-left:auto}
.rs-qba__brand-switch{position:relative;display:flex;width:148px;height:54px;flex:0 0 148px;align-items:center;justify-content:center;padding:10px 14px;overflow:hidden;border:1px solid rgba(215,177,93,.26);border-radius:14px;background:radial-gradient(circle at 50% 0,rgba(215,177,93,.10),transparent 52%),linear-gradient(145deg,rgba(30,27,22,.95),rgba(12,12,10,.98));box-shadow:0 10px 30px rgba(0,0,0,.20);text-decoration:none;transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease,background .18s ease}
.rs-qba__brand-switch:after{content:"";position:absolute;inset:0;pointer-events:none;border-radius:inherit;box-shadow:inset 0 0 0 1px rgba(255,255,255,.018)}
.rs-qba__brand-switch img{display:block;width:auto;height:auto;max-width:118px;max-height:34px;object-fit:contain;filter:drop-shadow(0 6px 12px rgba(0,0,0,.28));transition:transform .18s ease,filter .18s ease}
.rs-qba__brand-switch--avant-quartz img{max-width:92px;max-height:38px}
.rs-qba__brand-switch--centerstone img{max-width:112px;max-height:36px}
.rs-qba__brand-switch:hover{transform:translateY(-2px);border-color:rgba(240,207,115,.60);background:radial-gradient(circle at 50% 0,rgba(215,177,93,.18),transparent 56%),linear-gradient(145deg,rgba(38,33,25,.98),rgba(13,13,11,.99));box-shadow:0 16px 38px rgba(0,0,0,.30),0 0 0 1px rgba(215,177,93,.05)}
.rs-qba__brand-switch:hover img{transform:scale(1.035);filter:drop-shadow(0 8px 16px rgba(0,0,0,.34))}
.rs-qba__brand-switch:focus-visible{outline:2px solid #f0cf73;outline-offset:3px}
@media(max-width:900px){.rs-qba__section-head{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center}.rs-qba__brand-switcher{grid-column:1/-1;justify-content:flex-start;margin:4px 0 0}.rs-qba__brand-switch{width:160px;flex-basis:160px}}
@media(max-width:640px){.rs-qba__section-head{gap:14px 10px}.rs-qba__brand-switcher{width:100%;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.rs-qba__brand-switch{width:100%;height:52px;min-width:0;flex-basis:auto;padding:9px 12px}.rs-qba__brand-switch img{max-width:min(112px,82%);max-height:32px}.rs-qba__brand-switch--avant-quartz img{max-width:88px;max-height:36px}.rs-qba__brand-switch--centerstone img{max-width:108px;max-height:34px}}
@media(prefers-reduced-motion:reduce){.rs-qba__brand-switch,.rs-qba__brand-switch img{transition:none!important}}