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18px;font-size:13px;font-weight:600;display:inline-flex}.footer-nav-btn.primary{color:#fff;background:#7950d4;border-color:#7950d4}.calculator-floating-window{background:var(--surface);border:1px solid var(--line);z-index:100;border-radius:20px;flex-direction:column;width:290px;animation:.15s ease-out fadeIn;display:flex;position:fixed;top:90px;right:32px;overflow:hidden;box-shadow:0 15px 40px #00000059}.calc-header{background:var(--bg);border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;padding:12px 16px;display:flex}.calc-title{color:var(--text);align-items:center;gap:8px;font-size:12px;font-weight:700;display:flex}.calc-close-btn{width:22px;height:22px;color:var(--muted);background:0 0;border:0;border-radius:50%;justify-content:center;align-items:center;min-height:auto;padding:0;display:flex}.calc-screen{background:var(--surface);text-align:right;flex-direction:column;justify-content:flex-end;min-height:70px;padding:16px;display:flex}.calc-expression{color:var(--text);word-break:break-all;font-family:monospace;font-size:18px}.calc-live-result{color:var(--purple);min-height:18px;font-family:monospace;font-size:14px;font-weight:700}.calc-keypad-grid{background:var(--bg);grid-template-columns:repeat(4,1fr);gap:6px;padding:12px;display:grid}.calc-key{border:1px solid var(--line);background:var(--surface);color:var(--text);border-radius:10px;justify-content:center;align-items:center;min-height:40px;padding:12px 0;font-size:14px;font-weight:600;display:flex}.calc-key.fn{background:var(--soft);color:var(--purple)}.calc-key.op{background:var(--line);font-weight:700}.calc-key.eq{color:#fff;background:#7950d4;border-color:#7950d4;font-weight:700}.reference-sheet-modal{background:var(--surface);border:1px solid var(--line);border-radius:20px;flex-direction:column;width:90%;max-width:640px;max-height:80vh;display:flex;overflow:hidden;box-shadow:0 20px 60px #00000059}.modal-top-bar{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;padding:16px 24px;display:flex}.modal-top-bar h3{margin:0;font-size:16px;font-weight:700}.close-modal-btn{min-height:auto;color:var(--muted);background:0 0;border:0;padding:4px;font-size:16px}.modal-formulas-scroll{padding:24px;overflow-y:auto}@media (max-width:900px){.practice-panels-container{grid-template-columns:1fr;overflow-y:auto}.pane-separator-divider{width:100%;height:2px}.practice-left-pane,.practice-right-pane{padding:24px 20px;overflow:visible}.calculator-floating-window{width:270px;top:80px;right:16px}}@property --tw-translate-x{syntax:"*";inherits:false;initial-value:0}@property --tw-translate-y{syntax:"*";inherits:false;initial-value:0}@property --tw-translate-z{syntax:"*";inherits:false;initial-value:0}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-space-y-reverse{syntax:"*";inherits:false;initial-value:0}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-leading{syntax:"*";inherits:false}@property --tw-font-weight{syntax:"*";inherits:false}@property --tw-tracking{syntax:"*";inherits:false}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}@property --tw-backdrop-blur{syntax:"*";inherits:false}@property --tw-backdrop-brightness{syntax:"*";inherits:false}@property --tw-backdrop-contrast{syntax:"*";inherits:false}@property --tw-backdrop-grayscale{syntax:"*";inherits:false}@property --tw-backdrop-hue-rotate{syntax:"*";inherits:false}@property --tw-backdrop-invert{syntax:"*";inherits:false}@property --tw-backdrop-opacity{syntax:"*";inherits:false}@property --tw-backdrop-saturate{syntax:"*";inherits:false}@property --tw-backdrop-sepia{syntax:"*";inherits:false}
.rb-public{--p-bg:#f5f5f7;--p-panel:#fff;--p-ink:#1d1d1f;--p-muted:#6e6e73;--p-line:#00000010;--p-accent:#7b52cb;--p-soft:#7b52cb0e;--p-fill:#ffffff28;--p-edge:#ffffffc0;--p-shadow:#18172a20;font-optical-sizing:auto;background:radial-gradient(ellipse at 12% 8%,#7b52cb24,transparent 36%),radial-gradient(ellipse at 92% 48%,#bb354e15,transparent 36%),radial-gradient(ellipse at 45% 90%,#6593c916,transparent 40%),var(--p-bg);color:var(--p-ink);background-attachment:fixed;min-height:100dvh;font-family:Segoe UI Variable,system-ui,sans-serif;font-size:16px;line-height:1.45}.rb-public *{box-sizing:border-box}.rb-public a{color:var(--p-accent);text-decoration:none}.rb-public h1{letter-spacing:-.055em;margin:18px 0 24px;font-size:clamp(2.7rem,5vw,4.7rem);font-weight:650;line-height:1.07}.rb-public h2{letter-spacing:-.04em;margin:12px 0 18px;font-size:clamp(1.6rem,2.7vw,2.5rem);font-weight:650;line-height:1.15}.rb-public h3{letter-spacing:-.025em;margin:20px 0 10px;font-size:1.05rem;font-weight:650}.rb-public p{color:var(--p-muted);margin:0 0 20px;font-size:1rem;line-height:1.65}.rb-public small{color:var(--p-muted);font-size:.8rem}.rb-public .rb-eyebrow{letter-spacing:.12em;text-transform:uppercase;color:var(--p-muted);font-size:.7rem;font-weight:650}.rb-public-header{z-index:40;background:linear-gradient(135deg,#ffffff0c,transparent 65%),var(--p-fill);-webkit-backdrop-filter:blur(9px)saturate(1.15);border-bottom:1px solid var(--p-line);min-height:82px;box-shadow:inset 0 1px 0 var(--p-edge);justify-content:space-between;align-items:center;gap:22px;padding:19px max(28px,50vw - 620px);display:flex;position:sticky;top:0}.rb-public-brand{letter-spacing:-.025em;white-space:nowrap;align-items:center;gap:11px;font-size:1.1rem;font-weight:700;display:flex;color:var(--p-ink)!important}.rb-public-brand>span{color:#fff;background:linear-gradient(145deg,#9168dc,#6940ba);border-radius:11px;place-items:center;width:39px;height:39px;display:grid;box-shadow:inset 0 1px 1px #ffffff70,0 3px 8px #30204d10}.rb-public-header nav{align-items:center;gap:28px;display:flex}.rb-public-header nav a{color:var(--p-muted);font-size:.85rem}.rb-public-actions{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.rb-public .rb-public-button{background:linear-gradient(135deg,#ffffff0c,transparent 45%,#ffffff08),var(--p-fill);border:1px solid var(--p-line);min-height:43px;box-shadow:inset 0 1px 0 var(--p-edge),inset 1px 0 0 #ffffff18,inset 0 -1px 0 #00000012,0 3px 12px var(--p-shadow);-webkit-backdrop-filter:blur(5px)saturate(1.2);backdrop-filter:blur(5px)saturate(1.2);color:var(--p-ink);touch-action:manipulation;border-radius:999px;justify-content:center;align-items:center;gap:.5rem;padding:.65rem 1.1rem;font-family:inherit;font-size:.9rem;font-weight:600;text-decoration:none;transition:box-shadow .18s cubic-bezier(.23,1,.32,1);display:inline-flex;transform:scale(1)}.rb-public .rb-public-button.primary{background:linear-gradient(to bottom,#ffffff28,transparent 20%),var(--p-accent);color:#fff;border-color:#7b52cb99;box-shadow:inset 0 1px 1px #ffffff80,0 4px 12px #7b52cb2e}.rb-public .rb-public-button.quiet{box-shadow:none;-webkit-backdrop-filter:none;backdrop-filter:none;background:0 0;border-color:#0000}.rb-public button:active:not(:disabled){border-color:var(--p-accent);transform:scale(1);box-shadow:inset 0 1px 4px #0002}.rb-public :is(button,a,input,select,textarea,summary):focus-visible{outline:3px solid var(--p-accent);outline-offset:4px}.rb-public .rb-public-button:disabled{opacity:.4;cursor:default}.rb-public main.rb-public-body{width:auto;max-width:none;box-shadow:none;background:0 0;border:0;border-radius:0;min-height:0;margin:0;padding:0;display:block;position:static;overflow:visible}.rb-hero{grid-template-columns:1fr 1fr;align-items:center;gap:70px;max-width:1296px;margin:auto;padding:100px 28px 90px;display:grid}.rb-hero-copy>p{max-width:480px;margin-bottom:30px;font-size:1.1rem}.rb-hero-copy>small{align-items:center;gap:7px;margin-top:24px;display:flex}.rb-product-preview{border:1px solid var(--p-line);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);box-shadow:inset 0 1px 1px var(--p-edge),0 20px 60px #1a142d0d;background:#ffffff45;border-radius:18px;overflow:hidden}.rb-preview-toolbar{border-bottom:1px solid var(--p-line);background:var(--p-fill);box-shadow:inset 0 1px 0 var(--p-edge);align-items:center;gap:12px;padding:17px 20px;font-size:.8rem;display:flex}.rb-preview-toolbar>span{color:var(--p-muted);align-items:center;gap:6px;margin-left:auto;font-size:.65rem;display:flex}.rb-save-dot{background:#31b77a;border-radius:50%;width:6px;height:6px}.rb-preview-body{background:radial-gradient(ellipse at 15% 5%,#7b52cb16,transparent 65%),var(--p-bg);padding:30px}.rb-preview-body h2{margin:12px 0 24px;font-size:1.8rem}.rb-preview-resume{border:1px solid var(--p-line);background:#fff;border-radius:1rem;align-items:center;gap:13px;padding:22px 20px;display:flex}.rb-preview-resume b{font-size:.95rem;font-weight:650;display:block}.rb-preview-resume small{margin-top:4px;font-size:.7rem;display:block}.rb-preview-resume>svg:last-child{color:var(--p-accent);margin-left:auto}.rb-preview-book{background:var(--p-soft);width:43px;height:43px;color:var(--p-accent);border-radius:13px;flex-shrink:0;place-items:center;display:grid}.rb-preview-metrics{grid-template-columns:repeat(3,1fr);gap:10px;margin:14px 0;display:grid}.rb-preview-metrics>div{border:1px solid var(--p-line);background:#fff;border-radius:13px;padding:18px 14px}.rb-preview-metrics b{letter-spacing:-.04em;font-size:1.7rem;font-weight:650;display:block}.rb-preview-metrics small{margin-top:4px;font-size:.65rem;display:block}.rb-preview-review{color:var(--p-muted);align-items:center;gap:10px;padding:15px 2px 0;font-size:.75rem;display:flex}.rb-public-section{max-width:1296px;margin:auto;padding:75px 28px;scroll-margin-top:84px}.rb-section-intro{max-width:650px;margin-bottom:35px}.rb-section-intro p{margin:0}.rb-feature-grid{grid-template-columns:repeat(4,1fr);gap:20px;display:grid}.rb-feature-grid article{background:var(--p-panel);border:1px solid var(--p-line);border-radius:1rem;padding:24px}.rb-feature-grid article>svg{color:var(--p-accent)}.rb-feature-grid p{margin:0;font-size:.9rem}.rb-demo-player{border:1px solid var(--p-line);background:var(--p-panel);border-radius:16px;overflow:hidden}.rb-demo-header,.rb-demo-footer{border-bottom:1px solid var(--p-line);box-shadow:inset 0 1px 0 var(--p-edge);background:#f7f6fa;justify-content:space-between;align-items:center;gap:20px;padding:17px 24px;display:flex}.rb-demo-header>span,.rb-demo-footer>span{align-items:center;gap:9px;font-size:.85rem;display:flex}.rb-demo-header>span:last-child{color:var(--p-muted);font-size:.75rem}.rb-demo-panes{grid-template-columns:1fr 1fr;display:grid}.rb-demo-panes>div{padding:36px}.rb-demo-passage{border-right:1px solid var(--p-line);font-size:1rem;line-height:1.8}.rb-demo-question-head{color:var(--p-muted);justify-content:space-between;align-items:center;display:flex}.rb-demo-panes h3{margin:24px 0;font-size:1.1rem;font-weight:500;line-height:1.6}.rb-demo-options{gap:12px;margin-bottom:24px;display:grid}.rb-demo-options button{text-align:left;border:1px solid var(--p-line);color:var(--p-ink);box-shadow:none;background:#fff;border-radius:.8rem;align-items:center;gap:16px;min-height:58px;padding:16px;font-size:1rem;font-weight:400;display:flex}.rb-demo-options button>span{border:1px solid var(--p-line);border-radius:50%;place-items:center;width:26px;height:26px;font-size:.85rem;font-weight:600;display:grid}.rb-demo-options button[aria-pressed=true]{border-color:var(--p-accent);background:var(--p-soft)}.rb-demo-options button:disabled{opacity:1;cursor:default}.rb-demo-feedback{background:var(--p-soft);border-radius:.8rem;padding:20px}.rb-demo-feedback p{margin:10px 0 16px;font-size:.9rem}.rb-demo-footer{border-top:1px solid var(--p-line);border-bottom:0}.rb-public-about{border-top:1px solid var(--p-line);grid-template-columns:1fr 1fr;gap:75px;margin-top:30px;display:grid}.rb-public-about p{font-size:1rem}.rb-faq{max-width:870px}.rb-faq details{border:1px solid var(--p-line);background:var(--p-panel);border-radius:1rem;margin:12px 0;overflow:hidden}.rb-faq summary{cursor:pointer;justify-content:space-between;align-items:center;gap:25px;padding:22px;font-size:.95rem;font-weight:600;list-style:none;display:flex}.rb-faq summary::-webkit-details-marker{display:none}.rb-faq details p{margin:0;padding:0 22px 22px;font-size:.9rem}.rb-public-cta{text-align:center;padding:70px 25px 100px}.rb-public-cta>svg{color:var(--p-accent);margin:0 auto 16px}.rb-public-cta p{margin-bottom:26px}.rb-public-footer{border-top:1px solid var(--p-line);color:var(--p-muted);justify-content:space-between;align-items:center;gap:20px;margin:0;padding:24px max(28px,50vw - 620px);font-size:.75rem;display:flex}.rb-public-footer>div{gap:22px;display:flex}.rb-public-footer a{color:var(--p-muted)}.rb-entry{flex-direction:column;display:flex}.rb-entry .rb-public-header{position:static}.rb-public main.rb-entry-body{width:100%;max-width:1180px;box-shadow:none;background:0 0;border:0;border-radius:0;grid-template-columns:1fr 1fr;align-items:center;gap:85px;min-height:0;margin:auto;padding:72px 28px;display:grid}.rb-entry-intro h1{letter-spacing:-.045em;font-size:clamp(2rem,3.6vw,3.1rem)}.rb-entry-intro>p{max-width:470px;font-size:1rem}.rb-entry-intro ul{gap:17px;margin:30px 0;padding:0;list-style:none;display:grid}.rb-entry-intro li{align-items:center;gap:11px;font-size:.9rem;display:flex}.rb-entry-intro li svg{color:var(--p-accent)}.rb-entry-note{background:var(--p-fill);border:1px solid var(--p-line);box-shadow:inset 0 1px 0 var(--p-edge);border-radius:1rem;gap:14px;padding:20px;display:flex}.rb-entry-note>svg{color:var(--p-muted);flex-shrink:0}.rb-entry-note p{margin:0;font-size:.8rem}.rb-entry-form{background:var(--p-panel);border:1px solid var(--p-line);border-radius:1rem;overflow:hidden}.rb-entry-form-head{border-bottom:1px solid var(--p-line);align-items:center;gap:12px;padding:23px 27px;display:flex}.rb-entry-form-head svg{color:var(--p-accent)}.rb-entry-form-head h2{letter-spacing:-.025em;margin:0;font-size:1.2rem}.rb-entry-form form{gap:20px;padding:27px;display:grid}.rb-entry-form label{gap:9px;font-size:.85rem;font-weight:500;display:grid}.rb-entry-form label small{margin-top:-5px;font-size:.7rem}.rb-entry-form input{background:linear-gradient(135deg,#ffffff0c,transparent 45%,#ffffff08),var(--p-fill);border:1px solid var(--p-line);width:100%;min-height:44px;box-shadow:inset 0 1px 0 var(--p-edge),0 3px 12px var(--p-shadow);color:var(--p-ink);border-radius:.6rem;padding:.6rem .75rem;font-size:.95rem}.rb-entry-form .rb-entry-form-small{text-align:center;margin:0;font-size:.75rem}.rb-entry-form .rb-entry-error{color:#bb354e;margin:0;font-size:.85rem}.rb-entry .rb-public-footer{margin-top:auto}@media (hover:hover) and (pointer:fine){.rb-public .rb-public-button:hover{filter:none;box-shadow:inset 0 1px 2px var(--p-edge),0 5px 14px var(--p-shadow)}}@media (max-width:1000px){.rb-public-header{padding:18px 24px}.rb-public-header nav{gap:18px}.rb-hero{gap:35px;padding:70px 28px}.rb-feature-grid{grid-template-columns:repeat(2,1fr)}.rb-public main.rb-entry-body{gap:40px}.rb-preview-body{padding:22px}.rb-hero-copy>small{font-size:.7rem}.rb-public-header .rb-public-actions{gap:8px}}@media (max-width:720px){.rb-public-header{min-height:72px;padding:15px 20px}.rb-public-header nav{display:none}.rb-public-header .rb-public-actions{gap:3px}.rb-public-header .rb-public-actions .rb-public-button{padding:.6rem .8rem;font-size:.75rem}.rb-public-header .rb-public-button.quiet{padding:.6rem}.rb-public-brand{gap:8px;font-size:1rem}.rb-public-brand>span{width:33px;height:33px}.rb-hero{grid-template-columns:1fr;gap:40px;padding:55px 20px 35px}.rb-hero-copy>p{font-size:1rem}.rb-hero h1{font-size:clamp(2.5rem,9vw,3.9rem)}.rb-hero-copy>.rb-public-actions{gap:10px}.rb-hero-copy>.rb-public-actions .rb-public-button{font-size:.8rem}.rb-public-section{padding:45px 20px;scroll-margin-top:72px}.rb-feature-grid{grid-template-columns:1fr;gap:14px}.rb-feature-grid article{padding:23px}.rb-feature-grid h3{margin-top:16px}.rb-demo-panes{grid-template-columns:1fr}.rb-demo-panes>div{padding:25px}.rb-demo-passage{border-right:0;border-bottom:1px solid var(--p-line)}.rb-demo-header,.rb-demo-footer{flex-wrap:wrap;gap:12px;padding:15px 20px}.rb-public-about{grid-template-columns:1fr;gap:10px;margin-top:0}.rb-public-footer{flex-wrap:wrap;padding:24px 20px}.rb-public-cta{padding:45px 20px 65px}.rb-public main.rb-entry-body{grid-template-columns:1fr;gap:30px;padding:40px 20px}.rb-entry-intro ul{gap:12px;margin:20px 0}.rb-entry-form form{padding:24px}.rb-entry-form-head{padding:22px 24px}.rb-entry .rb-public-header>.rb-public-button{padding:.5rem .7rem;font-size:.75rem}}@media (prefers-reduced-transparency:reduce){.rb-public .rb-public-header,.rb-public 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