Numlee

0 solved

−

from 50 →

from 1,000 →

fraction

mixed ops

geometry

algebra

from 10,000 →

Σ sum

power

log

trig

law of sines

law of cosines

from 100,000 →

∏ product

tower

from 1,000,000 →

lim

∫ integral

derivative

; } .num-btn.type-sum { background: #e0f2f1; color: #00695c; } .num-btn.type-power { background: #e8eaf6; color: #283593; } .num-btn.type-product { background: #ede7f6; color: #4527a0; } .num-btn.type-tower { background: #f1f8e9; color: #558b2f; } .num-btn.type-limit { background: #fbe9e7; color: #bf360c; } .num-btn.type-integral { background: #eceff1; color: #37474f; } .num-btn.type-log { background: #fce4ff; color: #8e24aa; } .num-btn.type-geometry { background: #e0f7fa; color: #00838f; } .num-btn.type-algebra { background: #fff0f6; color: #ad1457; } .num-btn.type-trig { background: #e8f5e9; color: #2e7d32; } .num-btn.type-lawsin { background: #f3e5ab; color: #8d6e00; } .num-btn.type-lawcos { background: #ffe0e0; color: #c62828; } .num-btn.type-calculus { background: #e1f5fe; color: #01579b; } /* higher specificity than the type-* rules above so "done" always wins */ button.num-btn.done { background: #4caf50 !important; color: #fff !important; } button.num-btn.done:hover { background: #43a047 !important; } .legend { display: flex; flex-wrap: nowrap; overflow-x: auto; -webkit-overflow-scrolling: touch; gap: 7px 12px; padding: 8px 12px; font-size: 11px; color: #666; background: #fff; border-bottom: 1px solid #eee; scrollbar-width: none; } .legend::-webkit-scrollbar { display: none; } .legend .item { display: flex; align-items: center; gap: 5px; white-space: nowrap; flex-shrink: 0; } .legend .swatch { width: 10px; height: 10px; border-radius: 3px; flex-shrink: 0; } .legend .from { color: #aaa; } /* --- Desktop / wide-viewport refinements --- */ @media (min-width: 640px) { header { padding: 14px 18px; gap: 10px; } header h1 { font-size: 18px; } .controls { width: auto; gap: 8px; } .controls input[type="number"] { flex: 0 0 auto; width: 90px; font-size: 13px; padding: 6px 8px; border-radius: 6px; } .controls button, .reset-btn, .formula-btn { padding: 6px 10px; border-radius: 6px; } .formula-btn { margin-left: 0; } .formula-btn-label { display: inline; } main { padding: 18px; } .grid { grid-template-columns: repeat(auto-fill, minmax(58px, 1fr)); } .num-btn { min-height: 0; } .legend { flex-wrap: wrap; overflow-x: visible; gap: 7px 14px; padding: 8px 18px; } } #sentinel, #top-sentinel { height: 1px; grid-column: 1 / -1; } /* modal — full screen on phones (roomy tap targets, no fiddly small dialog), a large centered card on bigger screens */ .overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.5); display: flex; align-items: center; justify-content: center; padding: 0; z-index: 100; } .modal { background: #fff; border-radius: 0; padding: 28px 24px; width: 100%; height: 100%; max-width: none; display: flex; flex-direction: column; text-align: center; position: relative; overflow-y: auto; -webkit-overflow-scrolling: touch; } .modal { padding: 24px 18px; padding-top: 56px; } .modal math-field { font-size: 20px; padding: 12px 14px; max-height: 90px; } .modal-buttons { flex-shrink: 0; padding-top: 8px; } .modal input[type="text"] { font-size: 20px; padding: 14px; } .modal-buttons button { padding: 16px; font-size: 16px; } .modal-top-close { position: absolute; top: 14px; right: 14px; width: 34px; height: 34px; border-radius: 50%; border: none; background: #f0f0f0; color: #666; font-size: 18px; line-height: 1; cursor: pointer; display: flex; align-items: center; justify-content: center; } .modal-top-close:hover { background: #e2e2e2; } .modal .label { font-size: 13px; color: #888; letter-spacing: .02em; margin-bottom: 4px; } .modal .type-label { font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: .06em; margin-bottom: 18px; } .modal .problem { font-size: 24px; font-weight: 700; margin: 8px 0 22px; min-height: 1.4em; text-align: center; max-width: 100%; overflow-x: auto; overflow-y: hidden; -webkit-overflow-scrolling: touch; } .modal .problem .katex-display { margin: 0; } .modal .problem.fallback { font-family: "Courier New", monospace; font-size: 20px; white-space: pre-wrap; } .modal input[type="text"] { width: 100%; padding: 16px; font-size: 22px; text-align: center; border: 2px solid #ddd; border-radius: 10px; margin-bottom: 16px; font-family: "Courier New", monospace; } .modal math-field { display: block; width: 100%; box-sizing: border-box; margin-bottom: 16px; border: 2px solid #ddd; border-radius: 10px; padding: 14px 16px; --caret-color: #222; --contains-highlight-background-color: transparent; font-size: 22px; } .modal math-field:focus-within { border-color: #999; } .answer-hint { font-size: 12px; color: #999; margin-bottom: 6px; } .modal input.shake, .modal math-field.shake { animation: shake .3s; border-color: #e53935; } @keyframes shake { 25% { transform: translateX(-6px); } 75% { transform: translateX(6px); } } .modal-buttons { display: flex; gap: 10px; } .modal-buttons button { flex: 1; padding: 14px; border: none; border-radius: 10px; font-size: 16px; cursor: pointer; } .btn-check { background: #222; color: #fff; } .btn-close { background: #eee; color: #333; } .feedback { min-height: 22px; font-size: 15px; margin-bottom: 12px; font-weight: 600; } .feedback.ok { color: #2e7d32; } .feedback.bad { color: #c62828; } /* formula reference panel */ .formula-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.5); display: flex; align-items: center; justify-content: center; padding: 0; z-index: 200; } .formula-modal { background: #fff; border-radius: 0; width: 100%; height: 100%; max-width: none; display: flex; flex-direction: column; position: relative; } .formula-header { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; padding: 14px 16px 10px; border-bottom: 1px solid #eee; flex-shrink: 0; } .formula-header h2 { margin: 0; font-size: 17px; flex-shrink: 0; } .formula-search { flex: 1 1 100%; padding: 10px 12px; border: 1px solid #ccc; border-radius: 8px; font-size: 16px; order: 3; } .formula-close { order: 2; margin-left: auto; } .formula-close { width: 32px; height: 32px; border-radius: 50%; border: none; background: #f0f0f0; color: #666; font-size: 16px; line-height: 1; cursor: pointer; display: flex; align-items: center; justify-content: center; flex-shrink: 0; } .formula-close:hover { background: #e2e2e2; } .formula-list { overflow-y: auto; padding: 8px 16px 24px; flex: 1; -webkit-overflow-scrolling: touch; } /* --- Desktop / wide-viewport modal refinements --- */ @media (min-width: 640px) { .overlay { padding: 20px; } .modal { border-radius: 16px; width: 100%; max-width: 640px; height: auto; max-height: 90vh; min-height: 0; padding: 48px 44px; box-shadow: 0 20px 60px rgba(0,0,0,0.3); } .modal .problem { font-size: 42px; } .modal math-field { font-size: 28px; padding: 20px; } .modal-buttons { padding-top: 0; } .modal { padding-top: 48px; } .formula-overlay { padding: 24px; } .formula-modal { border-radius: 16px; width: 100%; max-width: 720px; height: 85vh; max-height: 800px; box-shadow: 0 20px 60px rgba(0,0,0,0.3); } .formula-header { flex-wrap: nowrap; padding: 18px 20px 12px; } .formula-header h2 { font-size: 18px; } .formula-search { flex: 1 1 auto; order: 0; font-size: 14px; } .formula-close { order: 0; margin-left: 0; } .formula-list { padding: 8px 20px 24px; } } .formula-card { padding: 14px 0; border-bottom: 1px solid #f0f0f0; } .formula-card:last-child { border-bottom: none; } .formula-card .fc-name { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; margin-bottom: 4px; } .formula-card .fc-note { font-size: 13px; color: #888; margin-top: 4px; } .formula-card .fc-latex { font-size: 18px; overflow-x: auto; padding: 2px 0; } .formula-empty { text-align: center; color: #999; padding: 40px 0; font-size: 14px; }