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rgba(239,68,68,.4);font-weight:800}.sk-numpad{width:100%;display:grid;grid-template-columns:repeat(5,1fr);gap:clamp(.2rem,.6vmin,.5rem);margin-bottom:clamp(.35rem,.8vmin,.75rem)}.sk-numpad-btn{padding:clamp(.5rem,1.5vmin,1.25rem);font-size:clamp(1rem,2.2vmin,2rem);font-weight:700;border:2px solid rgba(255,255,255,.2);border-radius:clamp(8px,1.2vmin,16px);background:#ffffff1a;color:#fff;cursor:pointer;transition:transform .1s,background .15s}.sk-numpad-btn:hover{background:#fff3;transform:scale(1.05)}.sk-numpad-btn:active{transform:scale(.95)}.sk-numpad-btn--clear{background:#ef44444d}.sk-numpad-btn--clear:hover{background:#ef444480}.sk-numpad--disabled{opacity:.4;pointer-events:none}.sk-numpad-btn--inactive{opacity:.5}.sk-numpad-btn:disabled{cursor:not-allowed}.sk-solve-answer-badge{padding:clamp(.4rem,1vmin,.8rem) clamp(1rem,2vmin,2rem);font-size:clamp(.9rem,1.8vmin,1.4rem);font-weight:700;color:#4ade80;border:2px solid rgba(34,197,94,.5);border-radius:12px;background:#22c55e1f}.sk-solve-answer-legend{display:flex;justify-content:center;gap:clamp(1rem,3vmin,2.5rem);padding:clamp(.5rem,1vmin,1rem) 0;font-size:clamp(.85rem,1.6vmin,1.2rem);font-weight:600}.sk-legend-correct{color:#4ade80}.sk-legend-correct:before{content:"";display:inline-block;width:12px;height:12px;border-radius:3px;background:#22c55e66;margin-right:6px;vertical-align:middle}.sk-legend-wrong{color:#fca5a5}.sk-legend-wrong:before{content:"";display:inline-block;width:12px;height:12px;border-radius:3px;background:#ef444459;margin-right:6px;vertical-align:middle}.sk-solve-hint{text-align:center;padding:clamp(.75rem,1.5vmin,1.5rem);color:#ffffff80;font-size:clamp(.85rem,1.6vmin,1.3rem)}.sk-solve-submit{width:100%;padding:clamp(.75rem,1.8vmin,1.4rem);font-size:clamp(1rem,2vmin,1.6rem);font-weight:700;border:none;border-radius:clamp(10px,1.5vmin,18px);background:linear-gradient(135deg,#f59e0b,#d97706);color:#fff;cursor:pointer;transition:transform .15s,box-shadow .15s;text-transform:uppercase;letter-spacing:.05em;margin-top:clamp(.25rem,.5vmin,.75rem)}.sk-solve-submit:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 8px 24px #f59e0b66}.sk-solve-submit:disabled{opacity:.5;cursor:not-allowed}@media(min-width:768px){.sk-solve-wrapper{max-width:clamp(400px,min(80vw,calc(100dvh - 30rem)),700px)}}@media(min-width:1280px){.sk-solve-wrapper{max-width:clamp(500px,min(60vw,calc(100dvh - 32rem)),800px)}}@media(min-width:2560px){.sk-solve-wrapper{max-width:min(calc(100dvh - 36rem),1200px)}}:root{--color-primary: #6366f1;--color-primary-hover: #4f46e5;--color-success: #10b981;--color-danger: #ef4444;--color-warning: #f59e0b;--color-background: #f8fafc;--color-surface: #ffffff;--color-card: #ffffff;--color-border: #e2e8f0;--color-text-primary: #1e293b;--color-text-secondary: #64748b;--color-text-muted: #94a3b8;--font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--radius-sm: 6px;--radius-md: 8px;--radius-lg: 12px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font-family);background-color:var(--color-background);color:var(--color-text-primary);line-height:1.5}button{cursor:pointer;border:none;font-family:inherit;font-size:.875rem;font-weight:500;padding:.5rem 1rem;border-radius:var(--radius-sm);transition:background-color .15s,opacity .15s}button:disabled{opacity:.5;cursor:not-allowed}input,select,textarea{font-family:inherit;font-size:.875rem;padding:.5rem .75rem;border:1px solid var(--color-border);border-radius:var(--radius-sm);outline:none;transition:border-color .15s}input:focus,select:focus,textarea:focus{border-color:var(--color-primary)}table{width:100%;border-collapse:collapse}th,td{padding:.75rem 1rem;text-align:left;border-bottom:1px solid var(--color-border)}th{font-weight:600;font-size:.75rem;text-transform:uppercase;color:var(--color-text-secondary);background:var(--color-background)}tr:hover td{background:#f1f5f9}.btn-primary{background:var(--color-primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--color-primary-hover)}.btn-danger{background:var(--color-danger);color:#fff}.btn-danger:hover:not(:disabled){background:#dc2626}.btn-outline{background:transparent;border:1px solid var(--color-border);color:var(--color-text-primary)}.btn-outline:hover:not(:disabled){background:var(--color-background)}.tiptap{padding:.75rem;outline:none;min-height:inherit;font-size:.875rem;line-height:1.6}.tiptap p{margin:.25em 0}.tiptap h2{font-size:1.25rem;font-weight:600;margin:.5em 0 .25em}.tiptap h3{font-size:1.1rem;font-weight:600;margin:.5em 0 .25em}.tiptap ul,.tiptap ol{padding-left:1.5rem;margin:.25em 0}.tiptap img{max-width:100%;height:auto;border-radius:var(--radius-sm);margin:.5em 0}.tiptap a{color:var(--color-primary);text-decoration:underline}.tiptap p.is-editor-empty:first-child:before{content:attr(data-placeholder);float:left;color:var(--color-text-muted);pointer-events:none;height:0}