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0;margin-bottom:8px}.app-header,.brand-title{display:flex;align-items:center}.brand-title{gap:10px;-webkit-user-select:none;-moz-user-select:none;user-select:none}.brand-badge{background:var(--accent-primary);color:#000;font-size:.65rem;font-weight:800;padding:2px 6px;border-radius:6px;text-transform:uppercase;letter-spacing:.05em;-webkit-text-fill-color:initial}.header-actions{gap:8px}.header-actions,.icon-btn{display:flex;align-items:center}.icon-btn{background:var(--bg-surface);color:var(--text-secondary);border:1px solid var(--border-subtle);border-radius:var(--radius-md);padding:8px;justify-content:center;cursor:pointer;transition:all .2s cubic-bezier(.4,0,.2,1);position:relative}.icon-btn:hover{background:var(--bg-glass);color:var(--text-primary);border-color:var(--accent-primary);transform:translateY(-1px);box-shadow:0 4px 12px var(--accent-glow)}.icon-btn:active{transform:translateY(1px) 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scale(.94)}.numpad-btn.active-digit{background:var(--btn-primary-bg);color:#fff;border-color:transparent;box-shadow:0 0 18px var(--accent-glow)}.numpad-digit{font-family:var(--font-mono);font-size:clamp(1.2rem,3.8vw,1.8rem);font-weight:800;line-height:1}.numpad-remaining{font-size:.65rem;font-weight:600;color:var(--text-muted);margin-top:2px}.numpad-btn.completed{opacity:.25;cursor:default}.game-status-bar{justify-content:space-between;width:100%;max-width:var(--board-max-size);padding:4px 8px}.game-status-bar,.status-pill{display:flex;align-items:center}.status-pill{gap:6px;font-size:.85rem;font-weight:600;color:var(--text-secondary)}.difficulty-badge{text-transform:capitalize;font-weight:700;font-size:.75rem;padding:3px 8px;border-radius:var(--radius-full);background:var(--bg-surface);border:1px solid var(--border-subtle);color:var(--accent-primary)}.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.75);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;z-index:100;padding:16px;animation:fadeIn .2s ease-out}.modal-content{background:var(--bg-surface);border:1px solid var(--border-strong);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg),0 0 40px var(--accent-glow);width:100%;max-width:480px;max-height:90vh;overflow-y:auto;padding:24px;animation:scaleUp .25s cubic-bezier(.16,1,.3,1)}.modal-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.modal-title{font-size:1.35rem;font-weight:800;color:var(--text-primary)}.btn-primary{background:var(--btn-primary-bg);color:var(--btn-primary-text);border:none;padding:12px 24px;border-radius:var(--radius-md);font-weight:700;font-size:.95rem;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:8px;width:100%;transition:all .2s ease;box-shadow:0 4px 14px var(--accent-glow)}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 20px var(--accent-glow)}.btn-secondary{background:var(--btn-secondary-bg);color:var(--btn-secondary-text);border:1px solid var(--border-subtle);padding:10px 20px;border-radius:var(--radius-md);font-weight:600;font-size:.9rem;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:8px;width:100%;transition:all .2s ease}.btn-secondary:hover{background:var(--bg-glass);border-color:var(--accent-primary)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes scaleUp{0%{opacity:0;transform:scale(.92) translateY(8px)}to{opacity:1;transform:scale(1) translateY(0)}}@keyframes shake{0%,to{transform:translateX(0)}20%,60%{transform:translateX(-4px)}40%,80%{transform:translateX(4px)}}@keyframes pulseGlow{0%,to{box-shadow:0 0 10px var(--hint-target-glow)}50%{box-shadow:0 0 25px var(--hint-target-glow)}}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border-strong);border-radius:9999px}::-webkit-scrollbar-thumb:hover{background:var(--accent-primary)}