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var(--tw-backdrop-sepia,)}.transition{transition-property:color,background-color,border-color,outline-color,text-decoration-color,fill,stroke,--tw-gradient-from,--tw-gradient-via,--tw-gradient-to,opacity,box-shadow,transform,translate,scale,rotate,filter,-webkit-backdrop-filter,backdrop-filter,display,content-visibility,overlay,pointer-events;transition-timing-function:var(--tw-ease,var(--default-transition-timing-function));transition-duration:var(--tw-duration,var(--default-transition-duration))}.transition-all{transition-property:all;transition-timing-function:var(--tw-ease,var(--default-transition-timing-function));transition-duration:var(--tw-duration,var(--default-transition-duration))}.duration-500{--tw-duration:.5s;transition-duration:.5s}.outline-none{--tw-outline-style:none;outline-style:none}.placeholder\:text-slate-400::placeholder{color:var(--color-slate-400)}@media (hover:hover){.hover\:bg-\[color\:var\(--bg-tertiary\)\]:hover{background-color:var(--bg-tertiary)}.hover\:bg-cyan-300\/20:hover{background-color:#53eafd33}@supports (color:color-mix(in lab, red, red)){.hover\:bg-cyan-300\/20:hover{background-color:color-mix(in oklab, var(--color-cyan-300) 20%, transparent)}}.hover\:bg-white\/\[0\.08\]:hover{background-color:#ffffff14}@supports (color:color-mix(in lab, red, red)){.hover\:bg-white\/\[0\.08\]:hover{background-color:color-mix(in oklab, var(--color-white) 8%, transparent)}}.hover\:text-white:hover{color:var(--color-white)}}.focus\:border-cyan-300\/60:focus{border-color:#53eafd99}@supports (color:color-mix(in lab, red, red)){.focus\:border-cyan-300\/60:focus{border-color:color-mix(in oklab, var(--color-cyan-300) 60%, transparent)}}.active\:scale-\[0\.98\]:active{scale:.98}.disabled\:opacity-60:disabled{opacity:.6}@media (min-width:390px){.min-\[390px\]\:mt-3{margin-top:calc(var(--spacing) * 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6)}.min-\[390px\]\:text-3xl{font-size:var(--text-3xl);line-height:var(--tw-leading,var(--text-3xl--line-height))}.min-\[390px\]\:text-4xl{font-size:var(--text-4xl);line-height:var(--tw-leading,var(--text-4xl--line-height))}.min-\[390px\]\:text-5xl{font-size:var(--text-5xl);line-height:var(--tw-leading,var(--text-5xl--line-height))}.min-\[390px\]\:text-lg{font-size:var(--text-lg);line-height:var(--tw-leading,var(--text-lg--line-height))}.min-\[390px\]\:text-\[2\.6rem\]{font-size:2.6rem}.min-\[390px\]\:text-\[15px\]{font-size:15px}}@media (min-width:40rem){.sm\:items-center{align-items:center}.sm\:pb-0{padding-bottom:calc(var(--spacing) * 0)}}@media (min-width:64rem){.lg\:block{display:block}}}:root{--bg-primary:#f8fafc;--bg-secondary:#fff;--bg-tertiary:#f1f5f9;--text-primary:#0f172a;--text-secondary:#475569;--text-tertiary:#94a3b8;--accent-primary:#3b82f6;--accent-success:#10b981;--accent-error:#ef4444;--accent-warning:#f59e0b;--math-operator:#8b5cf6;--math-number:#0f172a;--border-light:#e2e8f0;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a;--shadow-lg:0 10px 15px -3px #0000001a;--font-display:"Inter", -apple-system, BlinkMacSystemFont, sans-serif;--font-math:"JetBrains Mono", "SF Mono", Consolas, monospace;--text-xs:.75rem;--text-sm:.875rem;--text-base:1rem;--text-lg:1.125rem;--text-xl:1.25rem;--text-2xl:1.5rem;--text-3xl:1.875rem;--text-4xl:2.25rem;--text-5xl:3rem;--text-6xl:3.75rem;--app-bg:var(--bg-primary);--ink:var(--text-primary);--muted:var(--text-tertiary);--green:var(--accent-success);--red:var(--accent-error);--yellow:var(--accent-warning);--blue:var(--accent-primary);--radius-pill:999px;--radius-control:18px;--button-height-sm:34px;--button-height-md:42px;--button-height-lg:52px;--colour-primary:var(--accent-primary);--colour-primary-dark:#1d4ed8;--colour-surface:var(--bg-secondary);--colour-border:var(--border-light);--control-text:var(--text-primary);--control-muted:var(--text-secondary);--shadow-soft:0 6px 14px #0f172a14, 0 1px 3px #0f172a0f;--shadow-soft-hover:0 9px 18px #0f172a1a, 0 2px 5px #0f172a14;--shadow-pressed:inset 0 2px 5px #0f172a33, inset 0 -1px 0 #fff3;--button-highlight:inset 0 1px 0 #ffffffbf}@media (prefers-color-scheme:dark){:root{--bg-primary:#0f172a;--bg-secondary:#1e293b;--bg-tertiary:#334155;--text-primary:#f8fafc;--text-secondary:#cbd5e1;--text-tertiary:#64748b;--math-number:#f8fafc;--border-light:#334155}}*{box-sizing:border-box}html,body{background:var(--bg-primary);min-height:100%;color:var(--text-primary);font-family:var(--font-display);margin:0;overflow-x:hidden}button,select{font:inherit}button,a{-webkit-tap-highlight-color:transparent}.phone-screen{background:var(--bg-primary);width:100%;max-width:430px;min-height:100svh;margin:0 auto}.app-shell-header{z-index:10;border-bottom:1px solid var(--border-light);background:var(--bg-secondary);position:sticky;top:0}@supports (color:color-mix(in lab, red, red)){.app-shell-header{background:color-mix(in srgb, var(--bg-secondary) 88%, transparent)}}.app-shell-header{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.app-shell-inner{max-width:430px;margin:0 auto;padding:8px 10px}.app-shell-content{max-width:430px;margin:0 auto}.app-brand{min-width:0;color:var(--text-primary);align-items:center;gap:6px;text-decoration:none;display:inline-flex}.app-brand-mark{background:var(--accent-primary);color:#fff;border-radius:9px;flex:none;place-items:center;width:28px;height:28px;font-size:.9rem;font-weight:850;display:grid}.app-brand-text{max-width:64px;font-size:.86rem;font-weight:850;line-height:1.05}.home-panel,.practice-screen{min-height:calc(100svh - 50px)}.practice-panel{flex-direction:column;gap:clamp(7px,1.25svh,11px);min-height:calc(100svh - 50px);display:flex;overflow:visible}.practice-limit-badge{width:58px;height:58px}.top-bar{background:var(--bg-secondary);min-height:72px;color:var(--text-primary);box-shadow:var(--shadow-sm);align-items:center;gap:16px;padding:12px 20px;display:flex}.icon-button{color:currentColor;background:0 0;border:0;border-radius:999px;justify-content:center;align-items:center;width:clamp(40px,11vw,48px);height:clamp(40px,11vw,48px);display:inline-flex}.round-button{aspect-ratio:1;border:1px solid var(--border-light);border-radius:var(--radius-pill);background:var(--bg-secondary);min-height:0;box-shadow:var(--button-highlight), var(--shadow-soft);transition:transform .16s,box-shadow .16s,background .16s,border-color .16s;transform:translateY(0)}.round-button:hover{box-shadow:var(--button-highlight), var(--shadow-soft-hover);transform:translateY(-1px)}.round-button:active,.round-button.is-selected{box-shadow:var(--shadow-pressed);transform:translateY(1px)}.game-key{width:60px;height:60px;font-family:var(--font-display);color:var(--text-primary);justify-self:center}.game-number-key{background:var(--bg-secondary)}.game-control-key{color:#fff;font-family:var(--font-display);line-height:1}.game-control-danger{border-color:var(--accent-error)}@supports (color:color-mix(in lab, red, red)){.game-control-danger{border-color:color-mix(in srgb, var(--accent-error) 70%, var(--border-light))}}.game-control-danger{background:linear-gradient(180deg, var(--accent-error), var(--accent-error))}@supports (color:color-mix(in lab, red, red)){.game-control-danger{background:linear-gradient(180deg, color-mix(in srgb, var(--accent-error) 82%, #fff 18%), var(--accent-error))}}.game-control-warning{border-color:var(--accent-warning)}@supports (color:color-mix(in lab, red, red)){.game-control-warning{border-color:color-mix(in srgb, var(--accent-warning) 70%, var(--border-light))}}.game-control-warning{background:linear-gradient(180deg, var(--accent-warning), var(--accent-warning))}@supports (color:color-mix(in lab, red, red)){.game-control-warning{background:linear-gradient(180deg, color-mix(in srgb, var(--accent-warning) 82%, #fff 18%), var(--accent-warning))}}.game-control-submit{border-color:var(--accent-success)}@supports (color:color-mix(in lab, red, red)){.game-control-submit{border-color:color-mix(in srgb, var(--accent-success) 70%, var(--border-light))}}.game-control-submit{background:linear-gradient(180deg, var(--accent-success), var(--accent-success))}@supports (color:color-mix(in lab, red, red)){.game-control-submit{background:linear-gradient(180deg, color-mix(in srgb, var(--accent-success) 82%, #fff 18%), var(--accent-success))}}.game-control-submit:disabled{border-color:var(--border-light);background:var(--bg-tertiary);color:var(--text-secondary);opacity:.85}.pill-button{border:1px solid var(--border-light);border-radius:var(--radius-pill);background:var(--bg-secondary);min-height:clamp(56px,14svh,72px);color:var(--text-primary);box-shadow:var(--button-highlight), var(--shadow-soft)}.math-problem{font-family:var(--font-display);letter-spacing:0;color:var(--math-number);font-weight:750}.soft-button{border:1px solid var(--colour-border);border-radius:var(--radius-pill);background:var(--colour-surface);color:var(--control-text);box-shadow:var(--button-highlight), var(--shadow-soft);justify-content:center;align-items:center;font-weight:750;line-height:1.1;transition:transform .16s,box-shadow .16s,background .16s,color .16s,border-color .16s;display:inline-flex;position:relative;transform:translateY(0)}.soft-button:hover{box-shadow:var(--button-highlight), var(--shadow-soft-hover);transform:translateY(-1px)}.soft-button:active{box-shadow:var(--shadow-pressed);transform:translateY(1px)}.soft-button.is-selected{border-color:var(--colour-primary)}@supports (color:color-mix(in lab, red, red)){.soft-button.is-selected{border-color:color-mix(in srgb, var(--colour-primary) 75%, #000 10%)}}.soft-button.is-selected{background:linear-gradient(180deg, var(--colour-primary), var(--colour-primary))}@supports (color:color-mix(in lab, red, red)){.soft-button.is-selected{background:linear-gradient(180deg, color-mix(in srgb, var(--colour-primary) 88%, #fff 12%), color-mix(in srgb, var(--colour-primary) 78%, #1e1b4b 22%))}}.soft-button.is-selected{color:#fff;box-shadow:var(--shadow-pressed), inset 0 1px 0 #ffffff47}.soft-option-sm{min-height:var(--button-height-sm);min-width:68px;padding:0 10px;font-size:.78rem}.school-option{min-height:var(--button-height-md);border-radius:16px;min-width:0;padding:7px 8px;font-size:.68rem;line-height:1.08}.level-select-wrap{grid-template-columns:1fr;gap:6px;margin-top:0;display:grid}.level-select-label{color:var(--control-muted);font-size:var(--text-sm);font-weight:850}.level-select{appearance:none;border:1px solid var(--colour-border);border-radius:var(--radius-control);background:linear-gradient(45deg, transparent 50%, var(--text-secondary) 50%) calc(100% - 22px) 50% / 7px 7px no-repeat, linear-gradient(135deg, var(--text-secondary) 50%, transparent 50%) calc(100% - 16px) 50% / 7px 7px no-repeat, var(--colour-surface);width:100%;min-height:42px;color:var(--control-text);font-size:var(--text-sm);box-shadow:var(--button-highlight), var(--shadow-soft);padding:0 46px 0 16px;font-weight:650}.level-select:focus{outline:2px solid var(--accent-primary)}@supports (color:color-mix(in lab, red, red)){.level-select:focus{outline:2px solid color-mix(in srgb, var(--accent-primary) 34%, transparent)}}.level-select:focus{outline-offset:2px}.segmented-control{border-radius:var(--radius-pill);background:#0f172a;border:1px solid #ffffff14;align-items:center;gap:3px;padding:3px;display:inline-flex;box-shadow:inset 0 1px 1px #ffffff14,0 6px 14px #02061724}.segment-button{border-radius:var(--radius-pill);color:#94a3b8;background:0 0;border:0;min-width:76px;min-height:30px;font-size:.72rem;font-weight:800;position:relative;overflow:hidden}.segment-button.is-selected{color:#fff}.segment-button-bg{border-radius:inherit;box-shadow:var(--shadow-pressed), inset 0 1px 0 #ffffff4d;background:linear-gradient(#60a5fa,#6d5dfc);position:absolute;inset:0}.theme-icon-button{border:1px solid var(--border-light);border-radius:var(--radius-pill);background:var(--bg-secondary);min-width:32px;height:32px;color:var(--text-primary);box-shadow:var(--button-highlight), var(--shadow-soft)}.operation-row{border:1px solid var(--border-light);grid-template-columns:46px 1fr;align-items:center;gap:6px 10px;width:100%;min-height:48px;padding:3px 6px 3px 3px;display:grid}@supports (color:color-mix(in lab, red, red)){.operation-row{border:1px solid color-mix(in srgb, var(--border-light) 72%, transparent)}}.operation-row{background:var(--bg-secondary);border-radius:19px}@supports (color:color-mix(in lab, red, red)){.operation-row{background:color-mix(in srgb, var(--bg-secondary) 58%, transparent)}}.operation-button{color:var(--math-number);width:70px;height:70px;font-size:1.45rem;font-weight:900}.practice-panel .operation-button{width:42px;height:42px;font-size:1.35rem}.practice-panel .operation-button-mix{letter-spacing:0;font-size:1rem}.compact-operation-button{width:100%;height:auto;min-height:52px;max-height:64px;font-size:clamp(1rem,6svw,2.15rem)}.operation-button.is-selected{border-color:var(--math-operator)}@supports (color:color-mix(in lab, red, red)){.operation-button.is-selected{border-color:color-mix(in srgb, var(--math-operator) 36%, var(--border-light))}}.operation-button.is-selected{background:var(--bg-secondary)}@supports (color:color-mix(in lab, red, red)){.operation-button.is-selected{background:color-mix(in srgb, var(--bg-secondary) 86%, var(--math-operator) 14%)}}.difficulty-bars{grid-template-columns:repeat(3,minmax(0,1fr));gap:7px;display:grid}.difficulty-bar{border:1px solid var(--border-light);background:var(--bg-secondary);height:11px;box-shadow:var(--button-highlight), var(--shadow-sm);cursor:pointer;border-radius:10px}.difficulty-bar.is-selected{border-color:var(--math-operator)}@supports (color:color-mix(in lab, red, red)){.difficulty-bar.is-selected{border-color:color-mix(in srgb, var(--math-operator) 70%, var(--border-light))}}.difficulty-bar.is-selected{background:linear-gradient(180deg, var(--math-operator), var(--math-operator))}@supports (color:color-mix(in lab, red, red)){.difficulty-bar.is-selected{background:linear-gradient(180deg, color-mix(in srgb, var(--math-operator) 78%, #fff 22%), var(--math-operator))}}.difficulty-bar.is-selected{box-shadow:var(--shadow-pressed)}.action-button{border-radius:var(--radius-pill);justify-content:center;align-items:center;gap:12px;width:100%;min-height:46px;font-weight:900;text-decoration:none;transition:transform .16s,box-shadow .16s;display:flex}.practice-actions{margin-top:2px}.action-button:hover{transform:translateY(-1px)}.action-primary{border:1px solid var(--accent-success)}@supports (color:color-mix(in lab, red, red)){.action-primary{border:1px solid color-mix(in srgb, var(--accent-success) 65%, var(--border-light))}}.action-primary{background:linear-gradient(180deg, var(--accent-success), var(--accent-success))}@supports (color:color-mix(in lab, red, red)){.action-primary{background:linear-gradient(180deg, color-mix(in srgb, var(--accent-success) 82%, #fff 18%), var(--accent-success))}}.action-primary{color:#fff;box-shadow:inset 0 1px 0 #ffffff47, var(--shadow-soft-hover)}.action-primary span{color:currentColor!important}.action-secondary{border:1px solid var(--border-light);background:var(--bg-secondary);color:var(--control-text);box-shadow:var(--button-highlight), var(--shadow-soft)}@media (min-width:390px){.top-bar{gap:20px;min-height:84px;padding:18px 28px}.practice-limit-badge{width:64px;height:64px}.operation-row{grid-template-columns:50px 1fr;column-gap:11px;min-height:52px}.practice-panel .operation-button{width:46px;height:46px}.difficulty-bar{height:12px}.game-key{width:64px;height:64px}}@media (max-height:640px){.game-key{width:54px;height:54px}.practice-panel{gap:7px;padding-top:8px;padding-bottom:8px}.practice-panel h1{font-size:1.05rem}.practice-panel p,.practice-panel .level-select-label,.practice-panel a{font-size:.75rem}.soft-option-sm{min-height:30px}.level-select{min-height:36px}.compact-operation-button,.action-button{min-height:44px}}:root{--primary:#3b82f6;--primary-hover:#2563eb;--accent:#10b981;--accent-success:#10b981;--accent-error:#ef4444;--background-start:#f8fafc;--background-end:#f1f5f9;--card-bg:#fff;--text-primary:#0f172a;--text-secondary:#475569;--border:#e2e8f0;--timer-bg:#e2e8f0;--leaderboard-bg:#f8fafc}[data-mode=competitive]{--primary:#8b5cf6;--primary-hover:#7c3aed;--accent:#f59e0b;--accent-success:#10b981;--accent-error:#ef4444;--background-start:#1e1b4b;--background-end:#0f172a;--card-bg:#2e1065;--text-primary:#f8fafc;--text-secondary:#cbd5e1;--border:#4c1d95;--timer-bg:#4c1d95;--leaderboard-bg:#2e1065}*{transition-property:background-color,border-color,color,fill,stroke;transition-duration:.3s;transition-timing-function:ease-out}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-10px)}75%{transform:translate(10px)}}.animate-shake{animation:.3s ease-in-out shake}:root{--skin-primary:#3b82f6;--skin-primary-hover:#2563eb;--skin-secondary:#10b981;--skin-accent:#8b5cf6;--skin-background:linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);--skin-card-bg:#fff;--skin-text-primary:#1e293b;--skin-text-secondary:#64748b;--skin-border:#cbd5e1;--skin-timer-bg:#e2e8f0;--skin-button-bg:#3b82f6;--skin-success:#10b981;--skin-error:#ef4444;--skin-warning:#f59e0b}body{background:var(--skin-background)}:root{--accent-primary:var(--skin-primary);--accent-success:var(--skin-success);--accent-error:var(--skin-error);--accent-warning:var(--skin-warning);--bg-secondary:var(--skin-card-bg);--text-primary:var(--skin-text-primary);--text-secondary:var(--skin-text-secondary);--border-light:var(--skin-border)}[data-skin=kids] .round-button{transition:transform .2s}[data-skin=kids] .round-button:active{transform:scale(.9)rotate(2deg)}[data-skin=kids] .math-problem{text-shadow:2px 2px 4px #0000001a}[data-skin=teens] .round-button:hover{box-shadow:0 0 15px var(--skin-primary)}[data-skin=adults] .round-button{transition:all .2s}.lock-screen{overscroll-behavior:contain;touch-action:manipulation;-webkit-tap-highlight-color:transparent;width:100%;height:100dvh;position:fixed;inset:0;overflow:hidden}:is(html:has(.lock-screen),body:has(.lock-screen)){overscroll-behavior:none;overflow:hidden}@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-gradient-position{syntax:"*";inherits:false}@property --tw-gradient-from{syntax:"<color>";inherits:false;initial-value:#0000}@property --tw-gradient-via{syntax:"<color>";inherits:false;initial-value:#0000}@property --tw-gradient-to{syntax:"<color>";inherits:false;initial-value:#0000}@property --tw-gradient-stops{syntax:"*";inherits:false}@property --tw-gradient-via-stops{syntax:"*";inherits:false}@property --tw-gradient-from-position{syntax:"<length-percentage>";inherits:false;initial-value:0%}@property --tw-gradient-via-position{syntax:"<length-percentage>";inherits:false;initial-value:50%}@property --tw-gradient-to-position{syntax:"<length-percentage>";inherits:false;initial-value:100%}@property --tw-leading{syntax:"*";inherits:false}@property --tw-font-weight{syntax:"*";inherits:false}@property --tw-tracking{syntax:"*";inherits:false}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@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}@property --tw-duration{syntax:"*";inherits:false}