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legend{width:96px;color:var(--ios-secondary-label);float:left;font-size:.86rem;font-weight:700}.settings-links{border:1px solid var(--ios-separator);border-radius:16px;background:var(--ios-tertiary-background);display:grid;overflow:hidden}.settings-links a,.settings-links button{min-height:44px;border:0;background:transparent;color:var(--ios-label);display:flex;align-items:center;justify-content:space-between;padding:12px;font-size:.94rem;font-weight:650;text-decoration:none;text-align:left;cursor:pointer}.settings-links a+a,.settings-links button+a{border-top:1px solid var(--ios-separator)}.settings-links a:after,.settings-links button:after{content:"›";color:var(--ios-secondary-label);font-size:1.3rem;line-height:1}.segmented-control{border:1px solid var(--ios-separator);border-radius:999px;background:var(--ios-secondary-background);display:grid;grid-auto-columns:1fr;grid-auto-flow:column;flex:1;min-width:0;padding:2px}.segmented-control label{min-width:0}.segmented-control input{position:absolute;opacity:0;pointer-events:none}.segmented-control span{min-height:30px;border-radius:999px;color:var(--ios-secondary-label);display:grid;place-items:center;padding:7px 10px;font-size:.84rem;font-weight:650;cursor:pointer}.segmented-control input:checked+span{background:var(--ios-blue);color:var(--ios-label);box-shadow:0 6px 12px #007aff33}:root:not([data-theme=dark]) .segmented-control input:checked+span{color:#fff}.start-shell{display:flex;flex-direction:column}.start-panel{flex:1;display:grid;align-items:center}.start-card{display:grid;gap:26px;justify-items:stretch;padding:10px 0 36px}.start-copy{display:grid;gap:12px;justify-items:center;text-align:center}h1{margin:0;color:var(--ios-label);font-size:2.625rem;font-weight:700;line-height:1.04;letter-spacing:-.02em}.start-date{margin:0;color:var(--ios-secondary-label);font-size:1.25rem;font-weight:650}.start-secondary-actions{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;padding-inline:12px}.start-secondary-actions button{min-height:50px;border:1px solid var(--glass-border);border-radius:16px;background:var(--glass-fill);color:var(--ios-label);display:grid;place-items:center;padding:14px 12px;font-size:.95rem;font-weight:650;text-align:center;text-decoration:none;box-shadow:0 8px 18px #0000000a;-webkit-backdrop-filter:blur(22px) saturate(1.3);backdrop-filter:blur(22px) saturate(1.3);cursor:pointer}.start-secondary-actions button[aria-pressed=true]{border-color:#007aff59;background:var(--ios-blue-soft)}.start-info-card{width:min(320px,calc(100% - 24px));justify-self:center;border-radius:16px;background:var(--ios-secondary-background);color:var(--ios-label);display:grid;gap:5px;padding:14px 16px;text-align:left}.start-info-card strong{font-size:.95rem}.start-info-card span{color:var(--ios-secondary-label);font-size:.9rem;line-height:1.4}.play-button{min-height:60px;border:1px solid rgba(52,199,89,.35);border-radius:18px;background:var(--ios-green);color:#fff;font-size:1.06rem;font-weight:700;margin-inline:12px;box-shadow:0 14px 24px #34c7593d;cursor:pointer}.digit-rail{display:flex;align-items:center;justify-content:center;gap:8px;margin:0;padding-inline:0}.digit-rail span{width:40px;height:40px;display:grid;place-items:center;border-radius:8px;border:1px solid rgba(142,142,147,.3);background:var(--ios-secondary-background);color:var(--ios-secondary-label);font-size:1.5rem;font-weight:700;line-height:1}.digit-rail span.used{opacity:.5}.digit-rail span.active{color:var(--ios-label);border-color:var(--ios-blue);background:var(--ios-blue-soft);box-shadow:inset 0 0 0 2px var(--ios-blue)}.digit-rail i{width:auto;height:auto;background:transparent;color:var(--ios-secondary-label);font-style:normal;font-weight:700;font-size:1.45rem}.digit-rail i:before{content:"/"}.play-shell{width:min(430px,100%)}.game-panel{display:grid;gap:10px;padding:0}.equation-box{position:relative;min-height:76px;border-radius:12px;border:1px solid transparent;background:var(--ios-secondary-background);display:flex;align-items:center;justify-content:center;align-content:center;padding:12px 14px;font-size:1.65rem;overflow-x:auto;overflow-y:visible;white-space:nowrap;scrollbar-width:none}.equation-box::-webkit-scrollbar{display:none}.equation-preview{width:100%;min-height:48px;display:flex;align-items:center;justify-content:center;overflow-x:auto;overflow-y:visible;pointer-events:none;scrollbar-width:none}.equation-preview::-webkit-scrollbar,.equation-hit-layer::-webkit-scrollbar{display:none}.math-equation{display:inline-flex;align-items:center;padding-block:2px;color:inherit;line-height:normal}.math-equation .katex{color:inherit;font-size:1em;line-height:normal}.equation-preview .katex{font-size:1.08em}.equation-hit-layer{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;overflow-x:auto;overflow-y:visible;padding:12px 14px;scrollbar-width:none}.equation-token,.cursor-slot{border:0;background:transparent;color:var(--ios-label)}.equation-token{min-width:0;min-height:42px;display:inline-grid;place-items:center;padding:3px 1px;font:inherit;line-height:1;cursor:text}.equation-token:active{opacity:.7}.equation-hit-layer .equation-token{color:transparent}.equation-hit-layer .cursor{opacity:0;animation:none}.equation-hit-layer .equation-token:focus-visible,.equation-hit-layer .cursor-slot:focus-visible{outline:2px solid var(--ios-blue);outline-offset:-4px}.equation-cursor-marker{display:inline-block;width:0;min-height:1.15em;border-left:2px solid var(--ios-blue);border-radius:999px;vertical-align:-.16em;animation:blink 1.05s steps(2,start) infinite}.cursor-slot{width:18px;min-height:42px;display:inline-grid;place-items:center;padding:0;margin:0 -8px;cursor:text}.cursor-slot.empty{width:44px;margin:0}.cursor{width:2px;height:28px;border-radius:999px;background:var(--ios-blue);animation:blink 1.05s steps(2,start) infinite}.cursor-slot:not(.active) .cursor{opacity:0;animation:none}@keyframes blink{50%{opacity:0}}.helper-row{display:flex;justify-content:space-between;gap:16px;margin:0 16px}.helper-value{min-height:34px;border-radius:8px;background:var(--glass-fill);color:var(--ios-label);display:inline-flex;align-items:center;gap:4px;padding:8px 12px;font-family:ui-rounded,SF Pro Rounded,ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.98rem;font-weight:650;box-shadow:0 8px 18px #0000000a;-webkit-backdrop-filter:blur(22px) saturate(1.3);backdrop-filter:blur(22px) saturate(1.3)}.helper-label{color:var(--ios-secondary-label);font-weight:650}.value-display{display:inline-flex;align-items:baseline;white-space:nowrap;line-height:1;color:inherit}.value-segment{display:inline-block;color:inherit;line-height:1}.value-segment.repeating{border-top:1.2px solid currentColor;padding-top:2px;margin-top:-2px}.next-digit{width:90px;height:70px;display:block;margin:4px auto 8px;border:1px solid rgba(0,122,255,.35);border-radius:14px;background:var(--ios-blue);color:#fff;font-size:2.25rem;font-weight:700;box-shadow:0 14px 28px #007aff3d;cursor:pointer}.next-digit:disabled{background:var(--ios-gray);border-color:#8e8e9359;box-shadow:none;cursor:not-allowed}.operator-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}.operator-grid button{min-height:70px;border:1px solid rgba(142,142,147,.25);border-radius:14px;background:var(--ios-tertiary-background);color:var(--ios-label);font-size:1.95rem;font-weight:650;cursor:pointer}.operator-grid .wide,.operator-grid .submit{min-height:60px;grid-column:span 2;border-radius:12px}.operator-grid .submit{border-color:#34c75959;background:var(--ios-green);color:#fff;font-size:1.3rem;font-weight:700}.operator-grid .danger{color:var(--ios-red);border-color:#ff3b3047;background:#ff3b3029}.operator-grid .warning{color:var(--ios-orange);border-color:#ff950047;background:#ff950029}.operator-grid button:hover,.next-digit:hover,.play-button:hover,.start-secondary-actions button:hover,.site-nav button:hover,.page-nav a:hover{transform:translateY(-1px)}.operator-grid button:active,.next-digit:active,.play-button:active,.start-secondary-actions button:active,.site-nav button:active{transform:scale(.96);opacity:.82}.toast-region{position:fixed;z-index:40;top:calc(env(safe-area-inset-top,0px) + 74px);left:50%;width:min(430px,calc(100vw - 28px));display:flex;justify-content:center;pointer-events:none;transform:translate(-50%)}.status-toast{max-width:100%;min-height:44px;border:1px solid rgba(142,142,147,.22);border-radius:14px;background:var(--toast-fill);color:var(--ios-label);display:grid;grid-template-columns:4px minmax(0,1fr);align-items:center;gap:12px;padding:10px 14px 10px 10px;font-size:.98rem;font-weight:700;line-height:1.25;box-shadow:0 18px 42px #00000029;-webkit-backdrop-filter:blur(24px) saturate(1.35);backdrop-filter:blur(24px) saturate(1.35);animation:toast-in .18s ease-out}.status-toast-accent{width:4px;height:24px;border-radius:999px;background:var(--ios-green)}.status-toast.error .status-toast-accent{background:var(--ios-red)}@keyframes toast-in{0%{opacity:0;transform:translateY(-8px) scale(.98)}to{opacity:1;transform:translateY(0) scale(1)}}@media(prefers-reduced-motion:reduce){.status-toast{animation:none}}.solutions-panel{margin-top:20px;border-radius:18px;background:var(--ios-tertiary-background);padding:18px}.solutions-page{border-radius:18px;background:var(--ios-tertiary-background);display:grid;gap:18px;padding:18px}.solutions-page-header{display:flex;align-items:center;justify-content:space-between;gap:16px}.solutions-page-header h1{margin:0;font-size:1.55rem;line-height:1.1}.solutions-page-header p{margin:6px 0 0;color:var(--ios-secondary-label);font-weight:650}.solutions-page-header button{min-height:38px;border:1px solid var(--glass-border);border-radius:999px;background:var(--glass-fill);color:var(--ios-label);padding:8px 13px;font-weight:700;box-shadow:0 7px 16px #0000000a;-webkit-backdrop-filter:blur(22px) saturate(1.3);backdrop-filter:blur(22px) saturate(1.3);cursor:pointer}.solutions-panel h2,.document-page h2{margin:0 0 12px}.solutions-panel p,.solutions-panel li>span,.solutions-page p,.solutions-page li>span,.document-page p,.document-page li,.meta{color:var(--ios-secondary-label);line-height:1.55}.solutions-panel ol,.solutions-page ol{margin:0;padding-left:1.25rem}.solutions-panel li,.solutions-page li{margin-bottom:14px}.solutions-panel li>strong,.solutions-panel li>span,.solutions-page li>strong,.solutions-page li>span{display:block}.solution-equation{display:inline-block;max-width:100%;overflow-x:auto;overflow-y:hidden;vertical-align:middle;scrollbar-width:none}.solution-equation::-webkit-scrollbar{display:none}.solutions-panel .solution-equation,.solutions-panel .solution-equation *,.solutions-page .solution-equation,.solutions-page .solution-equation *{color:var(--ios-label)}.solutions-panel li>span,.solutions-page li>span{margin-top:4px;font-size:.92rem}.document-page section{border-radius:18px;background:var(--ios-tertiary-background);padding:22px}.document-page h1{margin:42px 0 12px}@media(min-width:760px){.app-shell{padding-top:30px}.play-shell{width:min(480px,100%)}}@media(min-width:920px){.settings-links .mobile-only-link{display:none}.mobile-only-link+a{border-top:0}.play-shell{width:min(980px,100%);display:grid;grid-template-columns:minmax(430px,480px) minmax(280px,1fr);align-items:start;column-gap:28px}.play-shell .top-bar{grid-column:1 / -1}.solutions-panel{margin-top:0;position:sticky;top:30px}.solutions-shell{width:min(560px,100%);display:block}}@media(max-width:919px){.play-shell:not(.solutions-shell)>.solutions-panel{display:none}}@media(max-width:520px){.brand span{display:none}}@media(max-width:380px){.site-nav{gap:6px;font-size:.88rem}.digit-rail{gap:6px}.digit-rail span{width:38px;height:38px}.operator-grid{gap:9px}.operator-grid button{min-height:64px}}@media(prefers-color-scheme:dark){:root{--ios-background: #000000;--ios-grouped-background: #000000;--ios-secondary-background: #1c1c1e;--ios-tertiary-background: #2c2c2e;--ios-label: #ffffff;--ios-secondary-label: #98989d;--ios-separator: rgba(84, 84, 88, .65);--ios-blue-soft: rgba(10, 132, 255, .22);--ios-blue: #0a84ff;--ios-green: #30d158;--ios-red: #ff453a;--ios-orange: #ff9f0a;--ios-gray: #8e8e93;--glass-fill: rgba(28, 28, 30, .72);--glass-border: rgba(84, 84, 88, .48);--toast-fill: rgba(28, 28, 30, .9);--shadow-soft: none}.brand img{box-shadow:none}.solutions-panel,.solutions-page,.document-page section{background:var(--ios-secondary-background)}.settings-panel{background:linear-gradient(180deg,#2c2c2ee6,#1c1c1eb8),var(--glass-fill)}}:root[data-theme=dark]{color-scheme:dark;--ios-background: #000000;--ios-grouped-background: #000000;--ios-secondary-background: #1c1c1e;--ios-tertiary-background: #2c2c2e;--ios-label: #ffffff;--ios-secondary-label: #98989d;--ios-separator: rgba(84, 84, 88, .65);--ios-blue-soft: rgba(10, 132, 255, .22);--ios-blue: #0a84ff;--ios-green: #30d158;--ios-red: #ff453a;--ios-orange: #ff9f0a;--ios-gray: #8e8e93;--glass-fill: rgba(28, 28, 30, .72);--glass-border: rgba(84, 84, 88, .48);--toast-fill: rgba(28, 28, 30, .9);--shadow-soft: none}:root[data-theme=dark] .brand img{box-shadow:none}:root[data-theme=dark] .solutions-panel,:root[data-theme=dark] .solutions-page,:root[data-theme=dark] .document-page section{background:var(--ios-secondary-background)}:root[data-theme=dark] .settings-panel{background:linear-gradient(180deg,#2c2c2ee6,#1c1c1eb8),var(--glass-fill)}:root[data-theme=light]{color-scheme:light;--ios-background: #ffffff;--ios-grouped-background: #f2f2f7;--ios-secondary-background: #f2f2f7;--ios-tertiary-background: #ffffff;--ios-label: #000000;--ios-secondary-label: #8a8a8e;--ios-separator: rgba(60, 60, 67, .22);--ios-blue: #007aff;--ios-blue-soft: rgba(0, 122, 255, .18);--ios-green: #34c759;--ios-red: #ff3b30;--ios-orange: #ff9500;--ios-gray: #8e8e93;--glass-fill: rgba(242, 242, 247, .76);--glass-border: rgba(60, 60, 67, .18);--toast-fill: rgba(255, 255, 255, .86);--shadow-soft: 0 16px 38px rgba(0, 0, 0, .08)}:root[data-theme=light] .brand img{box-shadow:0 4px 10px #0000001f}:root[data-theme=light] .solutions-panel,:root[data-theme=light] .solutions-page,:root[data-theme=light] .document-page section{background:var(--ios-tertiary-background)}:root[data-theme=light] .settings-panel{background:linear-gradient(180deg,#ffffffad,#ffffff47),var(--glass-fill)}