:root{--bg-main: #f8fafc;--bg-card: #ffffff;--text-main: #1e293b;--text-muted: #64748b;--color-blue-fill: #3b82f6;--color-blue-bg: #eff6ff;--color-blue-border: #2563eb;--color-red-fill: #f43f5e;--color-red-bg: #fff1f2;--color-red-border: #e11d48;--color-empty-bg: #ffffff;--color-empty-border: #94a3b8;--color-green-result: #16a34a;--color-green-bg: #f0fdf4;--color-green-border: #22c55e;--font-family: "Fredoka", "Outfit", system-ui, -apple-system, sans-serif;--radius-lg: 24px;--radius-md: 16px;--radius-sm: 10px;--shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, .05), 0 2px 4px -2px rgba(0, 0, 0, .05);--shadow-md: 0 10px 15px -3px rgba(0, 0, 0, .08), 0 4px 6px -4px rgba(0, 0, 0, .04);--shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, .1), 0 8px 10px -6px rgba(0, 0, 0, .04)}*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent;-webkit-user-select:none;user-select:none}body{font-family:var(--font-family);background:linear-gradient(135deg,#e0f2fe,#f0f9ff,#fae8ff);color:var(--text-main);min-height:100vh;display:flex;justify-content:center;align-items:center;padding:16px;touch-action:manipulation}#app{width:100%;max-width:900px;display:flex;flex-direction:column;gap:20px}.app-header{display:flex;justify-content:space-between;align-items:center;background:#ffffffd9;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);padding:14px 24px;border-radius:var(--radius-md);box-shadow:var(--shadow-sm);border:2px solid rgba(255,255,255,.9)}.header-title{display:flex;align-items:center;gap:12px}.header-logo-img{width:44px;height:44px;border-radius:10px;object-fit:cover;box-shadow:0 4px 10px #0000001f}.header-title .icon{font-size:2rem}.header-title h1{font-size:1.6rem;font-weight:700;color:#0f172a;display:flex;align-items:baseline;gap:8px}.header-title h1 span{font-size:1rem;font-weight:500;color:var(--text-muted)}.header-actions{display:flex;align-items:center;gap:12px}.icon-btn{background:#f1f5f9;border:2px solid #cbd5e1;border-radius:50%;width:44px;height:44px;font-size:1.2rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:transform .15s ease,background .15s ease}.icon-btn:active{transform:scale(.92)}.action-badge-btn{background:linear-gradient(135deg,#818cf8,#6366f1);color:#fff;border:none;padding:10px 16px;border-radius:20px;font-weight:600;font-size:.95rem;cursor:pointer;box-shadow:0 4px 12px #6366f14d;transition:transform .15s ease,box-shadow .15s ease}.action-badge-btn:active{transform:scale(.95)}.task-banner{background:linear-gradient(135deg,#fef08a,#fde047);border:2px solid #eab308;border-radius:var(--radius-md);padding:12px 20px;display:flex;align-items:center;justify-content:space-between;font-size:1.3rem;font-weight:600;color:#713f12;box-shadow:var(--shadow-sm);animation:slideDown .3s cubic-bezier(.34,1.56,.64,1)}.hidden,.task-banner.hidden{display:none!important}.task-text{font-size:1.5rem;font-weight:700;color:#854d0e}.close-task-btn{background:#fff9;border:none;border-radius:50%;width:32px;height:32px;font-size:1.1rem;cursor:pointer;display:flex;align-items:center;justify-content:center;color:#713f12}.main-container{display:flex;flex-direction:column;gap:20px}.grid-card{background:var(--bg-card);border-radius:var(--radius-lg);padding:32px 24px;box-shadow:var(--shadow-lg);border:3px solid #e2e8f0;display:flex;justify-content:center;align-items:center}.field-20{display:flex;flex-direction:column;gap:24px;width:100%;max-width:760px}.circle-row{display:flex;align-items:center;justify-content:center;gap:8px;width:100%}.circle-block{display:flex;gap:12px}.block-gap{width:32px;height:100%;display:flex;align-items:center;justify-content:center;position:relative}.block-gap:after{content:"";width:3px;height:40px;background:#cbd5e1;border-radius:2px;opacity:.5}.row-separator{height:12px}.circle-btn{width:60px;height:60px;border-radius:50%;border:3px solid var(--color-empty-border);background-color:var(--color-empty-bg);cursor:pointer;transition:transform .15s cubic-bezier(.34,1.56,.64,1),background-color .2s ease,border-color .2s ease,box-shadow .2s ease;position:relative;outline:none;box-shadow:inset 0 2px 4px #0000000f,0 3px 6px #0000000d}.circle-btn:active{transform:scale(.88)!important}.circle-btn[data-state=blue]{background:radial-gradient(circle at 35% 35%,#93c5fd,#3b82f6 70%,#1d4ed8);border-color:#1d4ed8;box-shadow:0 6px 14px #3b82f666,inset 0 -3px 6px #0003;animation:popIn .2s cubic-bezier(.34,1.56,.64,1)}.circle-btn[data-state=red]{background:radial-gradient(circle at 35% 35%,#fda4af,#f43f5e 70%,#be123c);border-color:#be123c;box-shadow:0 6px 14px #f43f5e66,inset 0 -3px 6px #0003;animation:popIn .2s cubic-bezier(.34,1.56,.64,1)}@keyframes popIn{0%{transform:scale(.8)}70%{transform:scale(1.1)}to{transform:scale(1)}}@keyframes slideDown{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.controls-card{background:var(--bg-card);border-radius:var(--radius-lg);padding:18px 24px;box-shadow:var(--shadow-md);border:3px solid #e2e8f0;display:grid;grid-template-columns:180px 1fr 140px;align-items:center;gap:16px}.mode-selector-wrapper{position:relative}.mode-dropdown-btn{background:#fff;border:3px solid #1e293b;border-radius:var(--radius-md);padding:10px 16px;font-family:var(--font-family);font-size:1.25rem;font-weight:700;color:#1e293b;width:100%;display:flex;justify-content:space-between;align-items:center;cursor:pointer;box-shadow:0 4px 6px #0000000d;transition:border-color .15s ease,transform .15s ease}.mode-dropdown-btn:active{transform:scale(.97)}.dropdown-chevron{font-size:.9rem;transition:transform .2s ease;color:#64748b}.mode-dropdown-btn.open .dropdown-chevron{transform:rotate(180deg)}.mode-dropdown-menu{position:absolute;top:calc(100% + 8px);left:0;width:100%;background:#fff;border:3px solid #1e293b;border-radius:var(--radius-md);box-shadow:var(--shadow-lg);list-style:none;z-index:100;overflow:hidden;animation:slideDown .15s ease-out}.mode-dropdown-menu.hidden{display:none}.mode-option{padding:12px 16px;font-size:1.15rem;font-weight:600;cursor:pointer;display:flex;align-items:center;gap:10px;transition:background .15s ease;color:#334155}.mode-option:hover,.mode-option:active{background:#f1f5f9}.mode-option.selected{background:#e2e8f0;color:#0f172a;font-weight:700}.equation-area{display:flex;justify-content:center;align-items:center}.equation-display{display:flex;align-items:center;gap:16px;font-size:2.2rem;font-weight:700}.eq-num{font-size:2.4rem;min-width:44px;text-align:center}.eq-red{color:#e11d48}.eq-blue{color:#2563eb}.eq-op,.eq-equals{color:#1e293b;font-weight:600}.btn-reveal-result{background:#f0fdf4;border:3px solid #22c55e;color:#16a34a;border-radius:var(--radius-md);min-width:64px;height:60px;padding:0 16px;font-family:var(--font-family);font-size:2rem;font-weight:700;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 10px #22c55e33;transition:transform .15s cubic-bezier(.34,1.56,.64,1),background-color .2s ease,color .2s ease,border-color .2s ease}.btn-reveal-result:active{transform:scale(.93)}.btn-reveal-result.revealed{background:#22c55e;color:#fff;border-color:#16a34a;box-shadow:0 6px 16px #22c55e66}.einfach-stats{display:flex;gap:16px;align-items:center;justify-content:center}.einfach-stats.hidden{display:none}.stat-pill{background:#f1f5f9;border:2px solid #cbd5e1;padding:8px 16px;border-radius:20px;font-size:1.1rem;font-weight:600;display:flex;align-items:center;gap:8px}.stat-pill .dot{width:14px;height:14px;border-radius:50%;display:inline-block}.stat-pill .dot.blue{background:#3b82f6}.stat-pill .dot.red{background:#f43f5e}.clear-action-wrapper{display:flex;justify-content:flex-end}.btn-clear{background:#fff;border:3px solid #1e293b;border-radius:var(--radius-md);padding:10px 20px;font-family:var(--font-family);font-size:1.2rem;font-weight:700;color:#1e293b;cursor:pointer;box-shadow:0 4px 6px #0000000d;transition:background .15s ease,transform .15s ease}.btn-clear:active{transform:scale(.95);background:#f1f5f9}.minus-mode-options{background:#ffffffb3;border:2px dashed #94a3b8;border-radius:var(--radius-md);padding:10px 20px;display:flex;align-items:center;justify-content:center;gap:24px;font-size:1rem;font-weight:500}.minus-mode-options.hidden{display:none}.sub-label{font-weight:700;color:#475569}.radio-option{display:flex;align-items:center;gap:8px;cursor:pointer}.radio-option input[type=radio]{width:18px;height:18px;accent-color:#2563eb}.app-footer{text-align:center;padding:8px}.color-legend{display:flex;justify-content:center;gap:20px;flex-wrap:wrap;font-size:.95rem;color:var(--text-muted);font-weight:500}.legend-item{display:flex;align-items:center;gap:6px}.legend-circle{width:16px;height:16px;border-radius:50%;border:2px solid var(--color-empty-border)}.legend-circle.blue{background:#3b82f6;border-color:#1d4ed8}.legend-circle.red{background:#f43f5e;border-color:#be123c}.legend-circle.empty{background:#fff}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border-0:0}@media (max-width: 768px){.controls-card{grid-template-columns:1fr;gap:16px;text-align:center}.clear-action-wrapper{justify-content:center}.circle-btn{width:48px;height:48px}.block-gap{width:16px}.circle-block{gap:6px}.equation-display{font-size:1.8rem}.eq-num{font-size:2rem}.minus-mode-options{flex-direction:column;gap:10px;align-items:flex-start}}