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var(--rf-space-md);line-height:var(--rf-line-height);margin-left:auto;margin-right:auto}@media (min-width:768px){.rf-section{padding-left:5%;padding-right:5%}}@media (min-width:1024px){.rf-section{width:80%;max-width:1140px;padding-left:0;padding-right:0}}.rf-grid-bg{background-image:linear-gradient(var(--rf-border) 1px, transparent 1px);background-size:100% var(--rf-line-height);background-repeat:repeat-y}.rf-nav-link-subtle{font-family:var(--rf-font-mono);opacity:.54;transition:opacity var(--rf-duration-fast) ease;font-size:.875rem;text-decoration:none}.rf-nav-link-subtle:hover{opacity:1}.rf-nav-link-subtle:focus-visible{outline:2px solid var(--rf-blue);outline-offset:2px;border-radius:2px}.rf-tile{background-color:var(--rf-tile);border:1px solid var(--rf-border);border-radius:var(--rf-radius-md);-webkit-mask-image:-webkit-radial-gradient(center, white, black);-webkit-mask-image:-webkit-radial-gradient(center, white, black);-webkit-mask-image:-webkit-radial-gradient(center, white, black);mask-image:-webkit-radial-gradient(center, white, black);transition:background-color var(--rf-duration-fast) ease, border-color var(--rf-duration-fast) ease, transform var(--rf-duration-normal) var(--rf-ease-spring), box-shadow var(--rf-duration-normal) var(--rf-ease-spring);position:relative}.rf-tile:hover{background-color:var(--rf-elevated)}.rf-tile p{margin:0}.rf-tile-hoverable:hover{transform:translateY(-2px);box-shadow:0 8px 24px #0000004d,0 0 0 1px #ea696114}.rf-cloze-input{font-family:var(--rf-font-mono);border:none;border-bottom:2px solid var(--rf-border);color:var(--rf-text-primary);transition:border-color var(--rf-duration-fast) var(--rf-ease-out), background-color var(--rf-duration-fast) var(--rf-ease-out), box-shadow .3s var(--rf-ease-out), transform .3s var(--rf-ease-spring);background:0 0;outline:none;padding:2px 4px;font-size:max(1em,16px);position:relative}.rf-cloze-input:after{content:"";transform-origin:50%;height:2px;transition:transform .3s var(--rf-ease-spring);position:absolute;bottom:-2px;left:0;right:0;transform:scaleX(0)}.rf-cloze-input:focus{border-bottom-color:var(--rf-blue);box-shadow:0 2px 0 var(--rf-blue), 0 4px 12px #ea696126}.rf-cloze-input::placeholder{color:var(--rf-text-muted);font-style:italic;transition:opacity .2s}.rf-cloze-input:focus::placeholder{opacity:.5}.rf-cloze-input[data-state=correct]{border-bottom-color:var(--rf-green);background:var(--rf-green-dim);color:var(--rf-green);animation:correctPop .5s var(--rf-ease-spring), correctGlow .8s var(--rf-ease-out)}.rf-cloze-input[data-state=wrong]{border-bottom-color:var(--rf-red);color:var(--rf-red);animation:wrongShake .5s var(--rf-ease-out), wrongFlash .6s ease-out;background:#ff537a1f}.rf-cloze-input[data-state=hinting]{border-bottom-color:var(--rf-pink);border-bottom-style:dashed}.rf-cloze-wrapper,.rf-cloze-field{vertical-align:baseline;display:inline-block;position:relative}.rf-cloze-input-hidden{caret-color:var(--rf-blue);color:#0000!important}.rf-char-overlay{pointer-events:none;font-family:var(--rf-font-mono);font-size:inherit;line-height:inherit;padding:2px 4px;display:flex;position:absolute;top:0;left:0}.rf-char{text-align:center;min-width:.58em;transition:color .15s var(--rf-ease-out), transform .2s var(--rf-ease-spring), opacity .15s ease;opacity:0;display:inline-block}.rf-char[data-filled=true]{opacity:1;animation:charAppear .25s var(--rf-ease-spring) forwards}.rf-char-correct{color:var(--rf-green)}.rf-char-correct[data-filled=true]{animation:charCorrect .3s var(--rf-ease-spring) forwards}.rf-char-wrong{color:var(--rf-red)}.rf-char-wrong[data-filled=true]{animation:charWrong .35s var(--rf-ease-out) forwards}.rf-char-pending{color:var(--rf-text-primary)}.rf-char-empty{opacity:0}.rf-check-icon{stroke-dasharray:24;stroke-dashoffset:0;animation:checkDraw .4s var(--rf-ease-out) forwards}.rf-cross-icon{stroke-dasharray:20;stroke-dashoffset:0;animation:crossDraw .3s var(--rf-ease-out) forwards}.rf-correct-answer{animation:fadeIn .3s var(--rf-ease-out) .2s both}.rf-diff-tooltip{background:var(--rf-elevated);border:1px solid var(--rf-border);border-radius:var(--rf-radius-md);font-family:var(--rf-font-mono);white-space:nowrap;pointer-events:none;z-index:60;opacity:0;transition:opacity .2s var(--rf-ease-out), transform .2s var(--rf-ease-out);padding:8px 12px;font-size:.8rem;display:block;position:absolute;bottom:calc(100% + 10px);left:50%;transform:translate(-50%)translateY(4px)scale(.96);box-shadow:0 8px 24px #0006}.rf-diff-tooltip-visible{opacity:1;transform:translate(-50%)translateY(0)scale(1)}.rf-diff-tooltip:after{content:"";border:6px solid #0000;border-top-color:var(--rf-border);position:absolute;top:100%;left:50%;transform:translate(-50%)}.rf-diff-row{justify-content:center;align-items:center;line-height:1.6;display:flex}.rf-diff-chars{gap:1px;display:flex}.rf-diff-chars>span{text-align:center;border-radius:2px;min-width:.7em;padding:0 1px;transition:background .15s;display:inline-block}.rf-diff-match{color:var(--rf-text-muted)}.rf-diff-wrong{color:var(--rf-red);background:#ff537a26;-webkit-text-decoration:line-through #ff537a80;text-decoration:line-through #ff537a80}.rf-diff-correct{color:var(--rf-green);background:#00ffb51f;font-weight:500}.rf-diff-divider{background:var(--rf-border);height:1px;margin:4px 0;display:block}.rf-btn{font-family:var(--rf-font-mono);letter-spacing:.05em;border:1.5px solid var(--rf-white);border-radius:var(--rf-radius-pill);color:var(--rf-white);cursor:pointer;transition:all var(--rf-duration-normal) var(--rf-ease-spring);-webkit-user-select:none;user-select:none;background:0 0;align-items:center;gap:.5em;padding:.85em 1.5em;font-size:.875rem;line-height:1;display:inline-flex;position:relative;overflow:hidden}.rf-btn:before{content:"";pointer-events:none;background:linear-gradient(90deg,#0000,#ffffff14,#0000);width:50%;height:100%;transition:none;position:absolute;top:0;left:-75%;transform:skew(-20deg)}.rf-btn:hover:before{animation:.6s ease-out forwards buttonShine}.rf-btn:hover{background:var(--rf-blue);border-color:#fff0;transform:scale(1.02);box-shadow:0 4px 16px #ea696140}.rf-btn:active{animation:.4s ease-out push}.rf-btn:focus-visible{outline:2px solid var(--rf-blue);outline-offset:2px}.rf-btn:disabled,.rf-btn[aria-disabled=true]{opacity:.32;cursor:not-allowed;pointer-events:none}.rf-btn-primary{background:var(--rf-blue);border-color:var(--rf-blue)}.rf-btn-primary:hover{background:#d4554e;border-color:#d4554e;box-shadow:0 4px 20px #ea696159}.rf-btn-secondary{border-color:var(--rf-blue);color:var(--rf-blue);background:var(--rf-blue-glow)}.rf-btn-secondary:hover{background:var(--rf-blue);color:var(--rf-white);border-color:var(--rf-blue);box-shadow:0 4px 20px #ea69614d}.rf-btn-ghost{opacity:.54;border-color:#0000}.rf-btn-ghost:hover{opacity:1;background:var(--rf-tile);box-shadow:none}.rf-btn-ghost:hover:before{animation:none}.rf-ripple{pointer-events:none;background:#ffffff4d;border-radius:50%;width:8px;height:8px;margin-top:-4px;margin-left:-4px;animation:.5s ease-out forwards rippleOut;position:absolute;transform:scale(0)}.rf-score{font-family:var(--rf-font-mono);font-size:3rem;font-weight:500;line-height:1;display:inline-block}.rf-score-animated{animation:scoreReveal .7s var(--rf-ease-spring) both}.rf-score-perfect{background:linear-gradient(135deg, var(--rf-green), var(--rf-blue));-webkit-text-fill-color:transparent;animation:scoreReveal .7s var(--rf-ease-spring) both, perfectPulse 2s ease-in-out .7s infinite;-webkit-background-clip:text;background-clip:text}.rf-progress-bar{position:relative;overflow:hidden}.rf-progress-fill{border-radius:inherit;height:100%;animation:progressFill 1s var(--rf-ease-out) .3s both;transition:none}.rf-progress-fill-glow{animation:progressFill 1s var(--rf-ease-out) .3s both, progressGlow 2s ease-in-out 1.3s infinite}.rf-streak{font-family:var(--rf-font-mono);border-radius:var(--rf-radius-pill);color:var(--rf-black);letter-spacing:.02em;transition:transform .3s var(--rf-ease-spring), box-shadow .3s ease, filter .3s ease;background-size:200% 200%;align-items:center;gap:.5em;padding:.5em 1.2em;font-size:.875rem;font-weight:600;animation:4s infinite streak;display:inline-flex;position:relative;overflow:hidden}.rf-streak:after{content:"";pointer-events:none;width:60%;height:100%;transition:none;position:absolute;top:0;left:-100%}.rf-streak:hover:after{animation:.8s ease-out streakShimmer}.rf-streak--bronze{background:linear-gradient(135deg,#cd7f32,#e8a862,#cd7f32);box-shadow:0 0 6px #cd7f3226}.rf-streak--bronze:after{background:linear-gradient(90deg,#0000,#ffffff26,#0000)}.rf-streak--bronze:hover{filter:brightness(1.06);box-shadow:0 0 12px #cd7f324d,0 0 28px #e8a86226}.rf-streak--silver{background:linear-gradient(135deg,#a8b8c8,#d4e0ec,#b8c8d8,#d4e0ec);animation:4s infinite streak,3s ease-in-out infinite streakGlowSilver}.rf-streak--silver:after{background:linear-gradient(90deg,#0000,#ffffff40,#0000)}.rf-streak--silver:hover{filter:brightness(1.08);animation:4s infinite streak,1.2s ease-in-out infinite streakPulse;box-shadow:0 0 14px #a8b8c859,0 0 32px #d4e0ec2e}.rf-streak--gold{background:linear-gradient(135deg,gold,#ffec80,#f0c030,#ffec80);animation:3.5s infinite streak,2.5s ease-in-out infinite streakGlowGold}.rf-streak--gold:after{background:linear-gradient(90deg,#0000,#ffffff4d,#0000)}.rf-streak--gold:hover{filter:brightness(1.1);animation:3.5s infinite streak,1s ease-in-out infinite streakPulse;box-shadow:0 0 18px #ffd70066,0 0 40px #f0c03033}.rf-streak--diamond{background:linear-gradient(135deg, var(--rf-green), var(--rf-blue), var(--rf-pink), var(--rf-blue));animation:3s infinite streak,2s ease-in-out infinite streakGlowDiamond}.rf-streak--diamond:after{background:linear-gradient(90deg,#0000,#ffffff59,#0000)}.rf-streak--diamond:hover{filter:brightness(1.12);animation:3s infinite streak,.8s ease-in-out infinite streakPulse;box-shadow:0 0 20px #00ffb559,0 0 48px #ea696133,0 0 64px #ffb3ff1a}.rf-tooltip{background:var(--rf-elevated);border:1px solid var(--rf-border);border-radius:var(--rf-radius-sm);font-family:var(--rf-font-mono);color:var(--rf-pink);white-space:nowrap;pointer-events:none;animation:hintBounceIn .35s var(--rf-ease-spring) forwards;z-index:50;padding:.5em .75em;font-size:.8rem;position:absolute;bottom:calc(100% + 8px);left:50%;transform:translate(-50%)}.rf-tooltip .tracking-widest{animation:hintReveal .4s var(--rf-ease-out) .1s both;display:inline-block}.rf-tooltip:after{content:"";border:5px solid #0000;border-top-color:var(--rf-border);position:absolute;top:100%;left:50%;transform:translate(-50%)}.rf-overlay{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:100;background:#000000b3;justify-content:center;align-items:center;animation:.3s forwards overlayIn;display:flex;position:fixed;inset:0}.rf-modal{background:var(--rf-tile);border:1px solid var(--rf-border);border-radius:var(--rf-radius-lg);width:90%;max-width:480px;max-height:80vh;animation:modalSlideIn .45s var(--rf-ease-spring) forwards;padding:2rem;overflow-y:auto;box-shadow:0 24px 64px #00000080,0 0 0 1px #ea69610f}.rf-nav-link{font-family:var(--rf-font-mono);color:var(--rf-text-secondary);transition:color var(--rf-duration-fast) ease;font-size:.875rem;text-decoration:none}.rf-nav-link:hover{color:var(--rf-white)}.rf-nav-link:focus-visible{outline:2px solid var(--rf-blue);outline-offset:2px;border-radius:2px}.rf-nav-link[data-active=true]{color:var(--rf-blue)}.rf-prose{font-family:var(--rf-font-serif);color:var(--rf-text-primary);max-width:42em;font-size:1.125rem;line-height:1.75}.rf-prose p{margin:1.5em 0}.rf-prose p:first-child{margin-top:0}.rf-prose strong{color:var(--rf-white)}.rf-prose em{color:var(--rf-text-secondary)}.rf-word-fade-out{animation:fadeOut .4s var(--rf-ease-out) forwards;display:inline-block}.rf-input-fade-in{animation:morphIn .5s var(--rf-ease-out) .2s both;display:inline-block}.rf-hue-rotate-hover:hover{animation:10s infinite hueRotate}.rf-blur-hover-content{transition:filter .5s var(--rf-ease-out), transform .5s var(--rf-ease-out)}.rf-blur-hover:hover .rf-blur-hover-content{filter:blur(44px);transform:scale(1.5)}button,[role=button],a,.rf-btn,.rf-tile-hoverable,select{cursor:pointer}input,textarea{cursor:text}@media (min-width:640px){body{font-size:17px}h1{font-size:3rem}}@media (min-width:768px){body{font-size:18px}}@media (min-width:1024px){body{font-size:20px}h1{font-size:3.5rem}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}.animate-shimmer{background:var(--rf-elevated);animation:none!important}.stagger-children>*{opacity:1;animation:none!important}.rf-streak{animation:none!important}}.rf-noise:before{content:"";pointer-events:none;z-index:9999;opacity:.03;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");background-repeat:repeat;background-size:256px 256px;position:fixed;inset: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}