:root{--bg:#07111f;--panel:#101f33;--panel-light:#172a42;--line:#29415e;--text:#f4f8ff;--muted:#9db0c7;--brand:#6d7cff;--success:#38d996;--danger:#ff7186;--warning:#ffc857}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body,#root{overscroll-behavior:none;background:var(--bg);width:100%;height:100%;color:var(--text);margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif;overflow:hidden}button,input{font:inherit}button{touch-action:manipulation}h1,h2,h3,p{margin:0}.app{width:100%;max-width:520px;height:100dvh;padding:max(10px, env(safe-area-inset-top)) 12px max(10px, env(safe-area-inset-bottom));grid-template-rows:auto minmax(0,1fr);gap:8px;margin:auto;display:grid;overflow:hidden}header{justify-content:space-between;align-items:center;min-height:44px;display:flex}.brand{letter-spacing:-.04em;font-size:clamp(1.15rem,5vw,1.55rem);font-weight:900}.brand span{color:#91a0ff}.sound{border:1px solid var(--line);background:var(--panel);width:42px;height:42px;color:var(--text);border-radius:14px;font-size:1.15rem}.screen{min-height:0;display:none;overflow:hidden}.screen.active{flex-direction:column;gap:10px;display:flex}.panel{border:1px solid var(--line);background:linear-gradient(145deg, var(--panel), #0c192a);border-radius:22px;min-height:0;padding:clamp(12px,3.4vw,18px)}.grow{flex:1;overflow:hidden}.scroll-panel{overscroll-behavior:contain;scrollbar-width:thin;overflow:auto}.eyebrow{color:#91a0ff;letter-spacing:.13em;text-transform:uppercase;font-size:.72rem;font-weight:800}.hero{padding:clamp(16px,5vw,28px)}.hero h1{letter-spacing:-.055em;margin:9px 0 10px;font-size:clamp(1.9rem,8vw,3.05rem);line-height:.98}.muted{color:var(--muted);font-size:.86rem;line-height:1.45}.difficulty,.game-top,.summary-grid,.level-rates,.report-grid{grid-template-columns:repeat(3,1fr);gap:7px;display:grid}.difficulty{gap:8px;margin-top:18px}.diff{border:1px solid 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strong{font-size:clamp(2.8rem,12vw,4.5rem);line-height:1;display:block}.result-heading{margin-top:14px;font-size:.9rem}.mistakes,.history-list,.rank-list,.report-scroll{gap:6px;display:grid}.mistakes{margin-top:9px}.mistake{background:var(--panel-light);border-radius:11px;justify-content:space-between;padding:8px 10px;font-size:.78rem;display:flex}.screen-title,.history-head{justify-content:space-between;display:flex}.screen-title{align-items:end}.screen-title h2{font-size:1.25rem}.screen-title p{color:var(--muted);font-size:.7rem}.history-card{border:1px solid var(--line);background:var(--panel-light);border-radius:15px;padding:11px}.history-meta{grid-template-columns:repeat(4,1fr);gap:5px;margin-top:8px;display:grid}.history-meta span{color:var(--muted);font-size:.65rem}.history-meta b{color:var(--text);font-size:.82rem;display:block}.badge{background:#0d1828;border-radius:999px;padding:4px 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.icon{margin-bottom:5px;font-size:1.35rem;display:block}.diff-btn.selected{background:#6366f124;border-color:#6366f1}.diff-description{color:var(--muted);text-align:center;margin-bottom:14px;font-size:.8rem}.btn{border-radius:14px;width:100%;min-height:46px;margin-bottom:9px}.btn-primary{color:#fff;background:linear-gradient(135deg,#6366f1,#7c3aed);border:0;box-shadow:0 6px 18px #6366f142}.btn-secondary{border:1px solid var(--line);background:var(--panel-light);color:var(--text)}.signed-user{color:var(--muted);text-align:center;padding-top:4px;font-size:.72rem}.auth-screen{padding:6px 16px 16px}.auth-card{width:100%;max-width:430px;margin:auto;padding:clamp(20px,5vw,30px)}.auth-heading{text-align:center;margin-bottom:24px}.auth-heading h2{font-size:clamp(1.6rem,7vw,2.1rem)}.auth-heading p{color:var(--muted);margin-top:6px;font-size:.84rem}.field-label{margin:0 0 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.stat{border-radius:14px;padding:9px 5px}.progress-wrap{background:var(--panel-light);border-radius:999px;height:5px;margin:0 18px;overflow:hidden}.progress-fill{border-radius:inherit;background:linear-gradient(90deg,#6366f1,#a855f7);height:100%;transition:width .3s linear}.question{border-radius:20px;margin:0 16px;position:relative}.streak-tag{color:var(--warning);opacity:0;background:#f59e0b29;border-radius:10px;padding:4px 9px;font-size:.72rem;font-weight:800;position:absolute;top:10px;right:10px}.streak-tag.show{opacity:1}.answer,.feedback,.numpad{margin-left:16px;margin-right:16px}.answer{background:var(--panel);border-radius:14px;width:calc(100% - 32px)}.key{background:var(--panel-light);border:0;border-radius:14px}.result-score strong{color:#0000;background:linear-gradient(135deg,#818cf8,#c084fc);-webkit-background-clip:text;background-clip:text}.nav-bottom{grid-template-columns:1fr 1fr;gap:8px;padding:0 16px;display:grid}.nav-bottom 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