:root{--ink:#172033;--muted:#667085;--line:#dfe5ee;--paper:#ffffff;--mist:#f4f7fb;--navy:#10233f;--blue:#246bfe;--teal:#25c09b;--amber:#f2b544;--max:1180px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;padding-top:72px;background:linear-gradient(180deg,#f7fafc 0,#eef4f7 620px,#fff 621px);color:var(--ink);font-family:"Segoe UI",Inter,Arial,sans-serif;line-height:1.55;letter-spacing:0}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.site-header{position:fixed;inset:0 0 auto;z-index:50;background:rgba(255,255,255,.88);border-bottom:1px solid rgba(16,35,63,.1);backdrop-filter:blur(18px)}.nav-wrap{width:min(var(--max),calc(100% - 40px));height:72px;margin:auto;display:flex;align-items:center;gap:22px}.brand,.footer-logo{display:flex;align-items:center;gap:12px;font-weight:850}.brand-mark{width:42px;height:42px;border-radius:50%;box-shadow:0 12px 26px rgba(36,107,254,.2)}.brand strong{font-size:21px;color:var(--navy)}.main-nav{margin-left:auto;display:flex;align-items:center;gap:22px;font-size:14px;font-weight:700;color:#334155}.main-nav a{position:relative}.main-nav a:hover{color:var(--blue)}.site-header .site-search,.header-search-toggle,.menu-toggle{display:none}
.rb-home{overflow:hidden}.rb-hero{position:relative;width:min(var(--max),calc(100% - 40px));min-height:560px;margin:auto;padding:64px 0 70px;display:grid;grid-template-columns:minmax(0,1.02fr) minmax(420px,.78fr);gap:54px;align-items:center}.rb-hero:before{content:"";position:absolute;inset:28px -80px 44px auto;width:46%;border-radius:40px;background:linear-gradient(145deg,rgba(36,107,254,.1),rgba(37,192,155,.14));transform:skewX(-7deg);z-index:-1}.eyebrow{margin:0;color:var(--blue);font-size:12px;font-weight:850;text-transform:uppercase}.rb-hero h1{margin:12px 0 18px;max-width:650px;font-size:62px;line-height:1.02;font-weight:850;color:var(--navy)}.rb-hero p{margin:0 0 26px;max-width:600px;color:#566070;font-size:18px}.rb-search{display:grid;grid-template-columns:minmax(0,1fr) 58px;width:min(550px,100%);height:58px;background:#fff;border:1px solid rgba(16,35,63,.12);border-radius:999px;box-shadow:0 18px 45px rgba(16,35,63,.1);overflow:hidden}.rb-search input{height:58px;border:0;outline:0;padding:0 22px;background:transparent;font:inherit}.rb-search button{width:58px;height:58px;border:0;border-radius:50%;background:var(--navy);color:#fff;font-size:22px;display:grid;place-items:center}.rb-quick-links{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.rb-quick-links a{display:inline-flex;align-items:center;min-height:36px;padding:0 14px;border:1px solid rgba(16,35,63,.12);border-radius:999px;background:rgba(255,255,255,.78);font-size:14px;font-weight:700;color:#2d3a4f}
.rb-hero-art{height:430px;position:relative}.rb-visual-shell{position:absolute;inset:6px 0 8px 0;border-radius:34px;background:linear-gradient(145deg,#17345d,#0e1d35);box-shadow:0 34px 90px rgba(16,35,63,.26);overflow:hidden}.rb-visual-shell:before{content:"";position:absolute;inset:-80px -120px auto auto;width:300px;height:300px;border-radius:50%;background:radial-gradient(circle,rgba(37,192,155,.55),rgba(37,192,155,0) 68%)}.rb-visual-shell:after{content:"";position:absolute;left:28px;right:28px;bottom:28px;height:112px;border-radius:24px;background:rgba(255,255,255,.09);border:1px solid rgba(255,255,255,.13)}.rb-visual-top{position:absolute;left:28px;top:26px;z-index:2;color:#fff}.rb-visual-top span,.rb-score-card small{display:block;color:#c7d7ea;font-size:12px;font-weight:750;text-transform:uppercase}.rb-visual-top strong{display:block;margin-top:3px;font-size:24px}.rb-camera-stage{position:absolute;left:56px;right:46px;top:92px;bottom:86px;z-index:1;display:grid;place-items:center}.rb-camera-main{width:245px;height:210px;object-fit:contain;filter:drop-shadow(0 28px 30px rgba(0,0,0,.28));animation:float 6s ease-in-out infinite}.rb-camera-secondary{position:absolute;right:6px;bottom:4px;width:150px;height:118px;object-fit:contain;padding:12px;border-radius:22px;background:#fff;box-shadow:0 24px 44px rgba(0,0,0,.24);animation:float 7s ease-in-out infinite reverse}.rb-score-card{position:absolute;z-index:3;display:grid;grid-template-columns:42px 1fr;column-gap:10px;align-items:center;min-width:205px;padding:14px 16px;border-radius:18px;background:rgba(255,255,255,.96);box-shadow:0 20px 45px rgba(0,0,0,.18)}.rb-score-card span{grid-row:1/3;width:42px;height:42px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(145deg,var(--blue),var(--teal));color:#fff;font-weight:850}.rb-score-card strong{font-size:15px;color:var(--navy)}.rb-score-card small{color:#64748b;text-transform:none}.rb-score-card-a{left:24px;bottom:72px}.rb-score-card-b{right:18px;top:94px}.rb-signal-bars{position:absolute;left:54px;right:54px;bottom:58px;z-index:2;display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.rb-signal-bars i{height:8px;border-radius:999px;background:rgba(255,255,255,.24)}.rb-signal-bars i:nth-child(1),.rb-signal-bars i:nth-child(2){background:linear-gradient(90deg,var(--teal),#fff)}
.rb-category-section,.section{width:min(var(--max),calc(100% - 40px));margin:auto;padding:48px 0}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:22px}.section-heading h2{margin:4px 0 0;font-size:31px;line-height:1.14;color:var(--navy)}.section-heading>a{font-weight:800;color:var(--blue)}.rb-category-grid,.topic-grid,.guide-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.rb-category-card,.topic-card,.guide-card,.method-principles div{background:#fff;border:1px solid rgba(16,35,63,.1);border-radius:16px;box-shadow:0 16px 38px rgba(16,35,63,.06)}.rb-category-card{min-height:220px;padding:24px;display:grid;gap:14px;align-content:start;position:relative;overflow:hidden}.rb-category-card:after{content:"";position:absolute;right:-38px;bottom:-42px;width:130px;height:130px;border-radius:50%;background:rgba(36,107,254,.08)}.rb-category-card.security{background:linear-gradient(145deg,#fff,#f0f7ff)}.rb-category-card strong{font-size:23px;color:var(--navy)}.rb-category-card small,.topic-card small,.guide-card small,.method-principles p{color:var(--muted);font-size:15px}.rb-3d-icon{width:76px;height:76px;border-radius:22px;background:linear-gradient(145deg,#fff,#dbe5f1);box-shadow:inset -13px -16px 26px rgba(16,35,63,.1),0 16px 32px rgba(16,35,63,.11);position:relative;overflow:hidden}.rb-3d-icon:before,.rb-3d-icon:after{content:"";position:absolute}.rb-icon-security:before{left:18px;top:16px;width:40px;height:42px;border-radius:13px;background:linear-gradient(145deg,var(--blue),var(--teal));box-shadow:0 16px 0 -8px #10233f}.rb-icon-security:after{left:29px;top:27px;width:18px;height:18px;border-radius:50%;background:#fff;box-shadow:0 0 0 5px rgba(255,255,255,.28),0 24px 0 -6px #10233f}.rb-icon-entertainment:before{left:17px;top:18px;width:42px;height:30px;border-radius:12px;background:linear-gradient(145deg,var(--blue),var(--teal));box-shadow:0 19px 0 -12px #10233f}.rb-icon-entertainment:after{left:22px;top:27px;width:6px;height:6px;border-radius:50%;background:#fff;box-shadow:12px 0 0 #fff,24px 0 0 #fff,4px 20px 0 2px #10233f,18px 20px 0 2px #10233f}.rb-icon-appliance:before{left:19px;top:16px;width:38px;height:44px;border-radius:13px;background:linear-gradient(145deg,var(--blue),var(--teal))}.rb-icon-appliance:after{left:28px;top:25px;width:20px;height:20px;border-radius:50%;border:4px solid #fff;box-shadow:0 25px 0 -7px #10233f,14px 25px 0 -7px #10233f,-14px 25px 0 -7px #10233f}.topic-card{display:grid;grid-template-rows:196px auto auto 1fr;overflow:hidden;transition:transform .18s ease,box-shadow .18s ease}.topic-card:hover,.rb-category-card:hover,.guide-card:hover{transform:translateY(-3px);box-shadow:0 24px 52px rgba(16,35,63,.1)}.topic-card.featured{grid-column:span 2;grid-template-columns:310px 1fr;grid-template-rows:auto auto 1fr}.topic-card img{width:100%;height:196px;object-fit:contain;padding:20px;background:linear-gradient(180deg,#fff,#f7fafc)}.topic-card.featured img{grid-row:1/4;height:100%;min-height:270px}.topic-card span{margin:18px 18px 0;color:var(--blue);font-size:12px;font-weight:850;text-transform:uppercase}.topic-card strong{margin:5px 18px;font-size:20px;line-height:1.2;color:var(--navy)}.topic-card small{margin:0 18px 18px;line-height:1.5}.guide-card{min-height:168px;padding:22px;display:grid;gap:8px}.guide-card span{color:var(--blue);font-size:12px;font-weight:850;text-transform:uppercase}.guide-card strong{font-size:21px;line-height:1.2;color:var(--navy)}.directory-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:16px;overflow:hidden}.directory-strip a{background:#fff;min-height:108px;padding:18px}.directory-strip strong{display:block;font-size:18px;color:var(--navy)}.directory-strip small{display:block;margin-top:8px;color:var(--muted);font-size:13px}
.method-section{width:100%;padding:62px max(20px,calc((100% - var(--max))/2));display:grid;grid-template-columns:.78fr 1.22fr;gap:42px;background:#f8fbfd;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.method-copy h2,.guide-cta-copy h2{font-size:33px;line-height:1.12;margin:6px 0 14px;color:var(--navy)}.method-copy p,.guide-cta-copy p{color:var(--muted);font-size:17px}.method-copy a{color:var(--blue);font-weight:800}.method-principles{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.method-principles div{padding:20px}.method-principles svg{width:42px;height:42px;fill:none;stroke:var(--blue);stroke-width:3;stroke-linecap:round;stroke-linejoin:round}.method-principles strong{display:block;margin:12px 0 8px;font-size:18px;color:var(--navy)}
.guide-cta-section{width:min(var(--max),calc(100% - 40px));margin:auto;padding:62px 0;display:grid;grid-template-columns:.72fr 1.28fr;gap:48px}.btn.primary{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 18px;border-radius:999px;background:var(--navy);color:#fff;font-weight:800}.guide-cta-list{display:grid;border-top:1px solid var(--line)}.guide-cta-list a{display:grid;grid-template-columns:70px 1fr;gap:14px;padding:18px 0;border-bottom:1px solid var(--line)}.guide-index{grid-row:1/4;width:44px;height:44px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(145deg,var(--blue),var(--teal));color:#fff!important;font-weight:850}.guide-cta-list span:not(.guide-index){color:var(--blue);font-size:12px;font-weight:850;text-transform:uppercase}.guide-cta-list strong{font-size:20px;color:var(--navy)}.guide-cta-list small{color:var(--muted)}
.site-footer{background:#10233f;color:#fff;padding:52px max(20px,calc((100% - var(--max))/2)) 24px}.footer-main{display:grid;grid-template-columns:340px 1fr;gap:54px}.footer-logo img{width:42px;height:42px}.footer-logo strong{font-size:24px}.footer-brand p{color:#cbd5e1}.footer-nav{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}.footer-nav div{display:grid;gap:9px;align-content:start}.footer-nav span{color:#8ddfd0;font-size:12px;font-weight:850;text-transform:uppercase}.footer-nav a{color:#eef2ff;font-size:14px}.legal{border-top:1px solid rgba(255,255,255,.14);margin:32px 0 0;padding-top:18px;color:#cbd5e1;font-size:12px}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-13px)}}@media(max-width:980px){.main-nav{display:none}.menu-toggle{display:grid;margin-left:auto;border:0;background:var(--navy);color:#fff;width:40px;height:40px;border-radius:50%;place-items:center}.rb-hero{grid-template-columns:1fr;min-height:0;padding:46px 0 54px}.rb-hero:before{display:none}.rb-hero-art{height:390px;order:-1;max-width:560px;width:100%;margin:auto}.rb-hero h1{font-size:46px}.rb-category-grid,.topic-grid,.guide-grid,.method-principles{grid-template-columns:1fr 1fr}.topic-card.featured{grid-column:span 2;grid-template-columns:1fr}.method-section,.guide-cta-section,.footer-main{grid-template-columns:1fr}.footer-nav{grid-template-columns:1fr 1fr}}@media(max-width:620px){body{padding-top:62px}.nav-wrap{width:calc(100% - 24px);height:62px}.brand strong{font-size:17px}.brand-mark{width:36px;height:36px}.rb-hero,.rb-category-section,.section,.guide-cta-section{width:min(100% - 28px,var(--max));padding:34px 0}.rb-hero h1{font-size:36px}.rb-hero p{font-size:16px}.rb-search{height:54px;grid-template-columns:minmax(0,1fr) 54px}.rb-search input,.rb-search button{height:54px}.rb-hero-art{height:310px}.rb-visual-shell{border-radius:26px}.rb-visual-top{left:28px;top:28px}.rb-visual-top strong{display:none}.rb-camera-stage{left:26px;right:26px;top:76px;bottom:72px}.rb-camera-main{width:188px;height:160px}.rb-camera-secondary{width:112px;height:90px;right:0}.rb-score-card{min-width:168px;padding:10px 12px}.rb-score-card span{width:34px;height:34px}.rb-score-card-b{right:10px;top:64px}.rb-score-card-a{left:10px;bottom:52px}.rb-signal-bars{left:34px;right:34px;bottom:38px}.section-heading{display:block}.section-heading h2{font-size:27px}.rb-category-grid,.topic-grid,.guide-grid,.method-principles,.directory-strip,.footer-nav{grid-template-columns:1fr}.topic-card.featured{grid-column:auto}.topic-card img,.topic-card.featured img{height:170px;min-height:0}.method-section{padding:42px 16px}.footer-nav{gap:24px}}