:root{--dd-fg: #111111;--dd-bg: #fafafa;--dd-muted: #6b7280;--dd-border: #e5e7eb;--dd-card-bg: #ffffff;--dd-accent: #111111;--dd-radius-lg: 18px;--dd-radius-md: 12px;--dd-radius-sm: 10px;--dd-font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--dd-gold-border: rgba(234, 179, 8, .5);--dd-border-dashed: rgba(156, 163, 175, .4);--dd-muted-text: var(--dd-muted, #9ca3af);--dd-subtle-glow: 0 0 16px rgba(234, 179, 8, .35);--dd-badge-glow-consistency: rgba(249, 115, 22, .3);--dd-badge-glow-speed: rgba(234, 179, 8, .35);--dd-badge-glow-skill: rgba(59, 130, 246, .3);--dd-badge-glow-dedication: rgba(59, 130, 246, .3);--dd-glass-bg: rgba(255, 255, 255, .75);--dd-glass-border: rgba(255, 255, 255, .6);--dd-glass-border-subtle: rgba(226, 232, 240, .8);--dd-glass-border-hover: rgba(0, 0, 0, .12);--dd-glass-blur: 16px;--dd-card-shadow: 0 8px 32px 0 rgba(15, 23, 42, .06);--dd-card-shadow-hover: 0 12px 40px 0 rgba(15, 23, 42, .12);--dd-tier-novice: 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var(--dd-subtle-bg);--color-text-secondary: var(--dd-muted);--color-text-tertiary: var(--dd-muted-text)}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@keyframes numberPulse{0%,to{opacity:.3;transform:scale(1)}50%{opacity:1;transform:scale(1.2)}}*{box-sizing:border-box}html,body{margin:0;padding:0;font-family:var(--dd-font-family);background-color:var(--dd-bg);color:var(--dd-fg);overflow:hidden;height:100%}#root{height:100%}a{color:inherit;text-decoration:none}a:hover{text-decoration:underline}button{font-family:inherit}.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}.app-shell{height:100%;display:flex;flex-direction:column}.app-header{position:sticky;top:0;z-index:20;background-color:var(--dd-bg);border-bottom:1px solid var(--dd-border);padding:calc(16px + env(safe-area-inset-top,0px)) calc(16px + env(safe-area-inset-right,0px)) 16px calc(16px + 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.hint-confirm__hint-text--solution{border-left-color:#f87171;background:#ef444426}.hint-confirm__dismiss{flex:1}.dd-button.dd-button--danger{background:#ef4444;color:#fff;border-color:#dc2626}.dd-button.dd-button--danger:hover{background:#dc2626}.dd-button.dd-button--danger:disabled{background:#9ca3af;border-color:#6b7280;cursor:not-allowed;opacity:.6}.dd-button.dd-button--warning{background:#f59e0b;color:#fff;border-color:#d97706}.dd-button.dd-button--warning:hover{background:#d97706}.dd-button.dd-button--warning:disabled{background:#9ca3af;border-color:#6b7280;cursor:not-allowed;opacity:.6}.play-level{margin:0;font-size:18px;font-weight:700;letter-spacing:-.01em;-webkit-user-select:none;user-select:none;-webkit-touch-callout:none;-webkit-tap-highlight-color:transparent}.play-instructions{margin:0;color:var(--dd-muted);font-size:14px;line-height:1.5;-webkit-user-select:none;user-select:none;-webkit-touch-callout:none;-webkit-tap-highlight-color:transparent}.play-instructions--completed{opacity:.4}.play-progress-text{color:var(--dd-muted);font-size:13px;-webkit-user-select:none;user-select:none;-webkit-touch-callout:none;-webkit-tap-highlight-color:transparent}.play-feedback{text-align:center;margin-top:2px}.play-keypad-region{position:relative}.paused-overlay{position:absolute;top:0;right:0;bottom:0;left:0;z-index:10;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;padding:20px 16px;border-radius:16px;background:var(--dd-card-bg);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);animation:completionFadeSlideUp .3s ease-out;text-align:center}.paused-overlay__icon{font-size:2rem;line-height:1}.paused-overlay__headline{font-size:1.1rem;font-weight:600;margin:0;color:var(--dd-text)}.paused-overlay__subtitle{font-size:.95rem;color:var(--dd-muted);margin:0 0 4px}.paused-overlay__btn{margin-top:8px}.play-timer-control{background:none;border:none;padding:4px 8px;border-radius:6px;display:flex;align-items:center;gap:4px;cursor:pointer;transition:opacity .15s ease,transform .15s ease,background .15s ease;color:var(--dd-fg);font-family:inherit;margin-right:-4px}.play-timer-control:hover:not(:disabled){opacity:.8;transform:scale(1.02);background:var(--dd-hover-bg)}.play-timer-control:disabled{cursor:default}.play-timer-icon{font-size:12px;line-height:1;display:flex;align-items:center}.dd-card{background-color:var(--dd-card-bg);border:1px solid 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ease-in}.dd-expression--wrong{border-color:#dc262640;border-style:dashed;background:#fef2f299;transition:background .2s ease,border-color .2s ease}.dd-expression__result-target{text-align:center;font-size:13px;font-weight:500;color:var(--dd-muted);padding-top:6px;animation:wrongFeedbackFadeIn .2s ease-out}@keyframes wrongFeedbackFadeIn{0%{opacity:0;transform:translateY(-2px)}to{opacity:1;transform:translateY(0)}}.dd-keypad{display:flex;flex-direction:column;gap:14px;margin-top:8px}.dd-keypad__row{display:flex;flex-wrap:nowrap;gap:8px;justify-content:flex-start;width:100%}.dd-keypad__actions{width:100%;gap:12px}.dd-keypad__actions .dd-button{flex:1 1 0;min-width:0;border-radius:12px}.dd-keypad__actions .dd-button--ghost{background:transparent;border-color:transparent;color:var(--dd-muted)}.dd-keypad__actions .dd-button--primary{flex:1.2 1 0;min-height:48px;border-radius:14px}.dd-button{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:1px solid var(--dd-border);background:var(--dd-card-bg);color:var(--dd-fg);border-radius:999px;padding:10px 16px;font-size:16px;font-weight:600;cursor:pointer;min-width:44px;min-height:44px;display:inline-flex;align-items:center;justify-content:center;transition:background .2s ease,color .2s ease,transform .1s ease;-webkit-user-select:none;user-select:none;-webkit-touch-callout:none;-webkit-tap-highlight-color:transparent;touch-action:manipulation;will-change:transform}.dd-button:active:not(:disabled){transform:scale(.95)}@keyframes chipTap{0%{transform:scale(1);filter:brightness(1)}30%{transform:scale(.88);filter:brightness(.88)}65%{transform:scale(1.06);filter:brightness(1.12)}to{transform:scale(1);filter:brightness(1)}}.dd-chip{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:1px solid var(--dd-border);background:var(--dd-card-bg);color:var(--dd-fg);border-radius:50%;padding:0;font-size:18px;font-weight:700;cursor:pointer;flex:0 1 58px;aspect-ratio:1 / 1;width:100%;max-width:58px;min-width:40px;display:inline-flex;align-items:center;justify-content:center;transition:background .15s ease,color .15s ease,border-color .15s ease,box-shadow .15s ease;-webkit-user-select:none;user-select:none;-webkit-touch-callout:none;-webkit-tap-highlight-color:transparent;touch-action:manipulation;will-change:transform}.dd-chip:active:not([disabled]){animation:chipTap .2s cubic-bezier(.36,.07,.19,.97) both;box-shadow:0 0 0 4px #3b82f62e}.dd-chip[disabled]{opacity:.4;cursor:not-allowed;background:var(--dd-bg);color:var(--dd-muted);border-color:var(--dd-border)}.dd-button--primary{background:#3b82f6;color:#fff;border-color:#2563eb}.dd-button--primary:disabled{background:#9ca3af;border-color:#6b7280;cursor:not-allowed;opacity:.6}.timer-tooltip{position:absolute;top:calc(100% + 8px);left:50%;transform:translate(-50%);width:max-content;max-width:260px;background:var(--dd-fg);color:var(--dd-card-bg);padding:12px 28px 12px 14px;border-radius:var(--dd-radius-sm);box-shadow:0 4px 12px #00000026;z-index:50;text-align:left;animation:tooltipFadeIn .3s ease-out}.timer-tooltip:before{content:"";position:absolute;top:-5px;left:50%;transform:translate(-50%);border-left:6px solid transparent;border-right:6px solid transparent;border-bottom:6px solid var(--dd-fg);pointer-events:none}.timer-tooltip__title{font-size:13px;font-weight:600;margin-bottom:4px;pointer-events:none}.timer-tooltip__body{font-size:12px;line-height:1.4;color:#ffffffd9;pointer-events:none}.timer-tooltip__close{position:absolute;top:6px;right:6px;width:24px;height:24px;display:flex;align-items:center;justify-content:center;background:transparent;border:none;color:#fff9;font-size:18px;line-height:1;cursor:pointer;padding:0;border-radius:50%;transition:background .15s ease,color .15s ease}.timer-tooltip__close:hover{background:#ffffff1a;color:#ffffffe6}@media (prefers-color-scheme: dark){:root:not(.light-theme) .timer-tooltip{background:var(--dd-card-bg);color:var(--dd-fg);border:1px solid var(--dd-border);box-shadow:0 4px 16px #0006}:root:not(.light-theme) .timer-tooltip:before{border-bottom-color:var(--dd-card-bg)}:root:not(.light-theme) .timer-tooltip__body{color:var(--dd-muted)}:root:not(.light-theme) .timer-tooltip__close{color:var(--dd-muted)}:root:not(.light-theme) .timer-tooltip__close:hover{background:#ffffff1a;color:var(--dd-fg)}}.dark-theme .timer-tooltip{background:var(--dd-card-bg);color:var(--dd-fg);border:1px solid var(--dd-border);box-shadow:0 4px 16px #0006}.dark-theme .timer-tooltip:before{border-bottom-color:var(--dd-card-bg)}.dark-theme .timer-tooltip__body,.dark-theme .timer-tooltip__close{color:var(--dd-muted)}.dark-theme .timer-tooltip__close:hover{background:#ffffff1a;color:var(--dd-fg)}@keyframes tooltipFadeIn{0%{opacity:0;transform:translate(-50%,-4px)}to{opacity:1;transform:translate(-50%)}}:root{--completion-accent: #f59e0b;--completion-accent-muted: 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