:root{ --ink:#241b3e; --ink-soft:#5b5378; --paper:#fffdf7; --card:#ffffff; --blue:#7b2ff7; --pink:#ff3d81; --sun:#ffb703; --radius:22px; --shadow:0 10px 30px rgba(36,27,62,.10); --shadow-big:0 24px 60px rgba(36,27,62,.16); --grad-hero:linear-gradient(135deg,#7b2ff7 0%,#ff3d81 55%,#ffb703 110%); } *{box-sizing:border-box;margin:0;padding:0} html{scroll-behavior:smooth} body{ font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif; background:var(--paper);color:var(--ink);line-height:1.6; -webkit-font-smoothing:antialiased; } .wrap{max-width:1180px;margin:0 auto;padding:0 20px} /* Header */ header{ position:sticky;top:0;z-index:50; background:rgba(255,253,247,.85);backdrop-filter:blur(12px); border-bottom:2px solid rgba(36,27,62,.06); } .nav{display:flex;align-items:center;gap:18px;height:68px} .logo{display:flex;align-items:center;gap:10px;font-weight:900;font-size:1.45rem;text-decoration:none;color:var(--ink)} .logo b{background:var(--grad-hero);-webkit-background-clip:text;background-clip:text;color:transparent} .switch-mark{display:inline-flex;align-items:center;width:44px;height:26px;border-radius:999px;background:linear-gradient(135deg,#8a93b8,#565d85);padding:3px;transition:.25s;} .switch-mark .knob{width:20px;height:20px;border-radius:50%;background:#fff;transition:.25s} .logo:hover .switch-mark{background:linear-gradient(135deg,#13d97b,#0db56a)} .logo:hover .switch-mark .knob{transform:translateX(18px)} .nav-links{display:flex;gap:4px;margin-left:auto} .nav-links a{text-decoration:none;color:var(--ink-soft);font-weight:800;font-size:.92rem;padding:8px 14px;border-radius:999px;transition:.18s} .nav-links a:hover{background:rgba(46,99,255,.1);color:var(--blue)} .menu-toggle{display:none;background:none;border:none;cursor:pointer;font-size:1.8rem;color:var(--ink);padding:8px 12px;margin-left:auto} /* Language Switcher */ .language-switcher { margin-left: auto; display: flex; align-items: center; } .language-switcher select { padding: 8px 12px; border: 2px solid var(--blue); border-radius: 6px; background: #fff; color: var(--ink); font-weight: 700; cursor: pointer; font-size: 0.9rem; font-family: inherit; transition: .2s; } .language-switcher select:hover { background: rgba(123, 47, 247, 0.05); border-color: var(--blue); } .language-switcher select:focus { outline: none; border-color: var(--blue); box-shadow: 0 0 0 4px rgba(123, 47, 247, 0.12); } @media(max-width:760px){.nav-links{display:none;position:absolute;top:68px;left:0;right:0;background:rgba(255,253,247,.98);flex-direction:column;padding:12px 0;z-index:40}.nav-links.active{display:flex}.nav-links a{padding:14px 20px;border-radius:0;width:100%}.menu-toggle{display:block}} /* Hero */ .hero{background:var(--grad-hero);padding:56px 0 72px;color:#fff;text-align:center} .hero h1{font-size:2.4rem;font-weight:900;line-height:1.2} h1, h2, h3, h4 {font-family:'Nunito',sans-serif} h1, h2 {text-align:center} /* Main Content */ section{padding:48px 0} .calc-container{ display:grid;grid-template-columns:1fr 1fr;gap:32px;max-width:1000px;margin:0 auto; } .calculator-card{ background:var(--card);border-radius:var(--radius); box-shadow:var(--shadow);padding:32px;position:relative; transition:.2s;border:2px solid transparent; } .calculator-card.drag-over{ border-color:var(--blue);background:rgba(123,47,247,.02); } .calc-title{font-weight:900;font-size:1.1rem;margin-bottom:24px;color:var(--ink);text-align:center} .display{ background:#eef5ff;border-radius:12px;padding:20px;margin-bottom:24px; text-align:right;min-height:60px;display:flex;align-items:center;justify-content:flex-end; font-size:2rem;font-weight:900;color:var(--blue);word-break:break-all; cursor:grab;user-select:none;transition:.2s; } .display:active{cursor:grabbing} .display.dragging{opacity:.6;background:rgba(123,47,247,.1)} .button-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px} .btn{ padding:16px;border:none;border-radius:10px;font-weight:900;font-size:1rem; cursor:pointer;transition:.15s;background:#f0f3f9;color:var(--ink); } .btn:hover{background:#e3e9f7;transform:translateY(-2px)} .btn.operator{background:var(--pink);color:#fff} .btn.operator:hover{background:#ff2566;transform:translateY(-2px)} .btn.equals{background:var(--blue);color:#fff;grid-column:span 2} .btn.equals:hover{background:#6b28d4;transform:translateY(-2px)} .btn.clear{background:#ff6b6b;color:#fff;grid-column:span 2} .btn.clear:hover{background:#ff5252;transform:translateY(-2px)} /* Exchange Button */ .exchange-button{ position:absolute;top:50%;left:50%;transform:translate(-50%,-50%); background:var(--blue);color:#fff;border:none;width:50px;height:50px; border-radius:50%;font-size:1.5rem;cursor:pointer;font-weight:900; box-shadow:var(--shadow);transition:.2s;z-index:10; } .exchange-button:hover{background:var(--pink);transform:translate(-50%,-50%) scale(1.1)} .table-container{ display:flex;justify-content:center;width:100%; } .table-scroll{ overflow-x:auto;position:relative; background:linear-gradient(to right,transparent,rgba(255,255,255,.8)) no-repeat right; max-width:100%; } table{ border-collapse:collapse;margin:0 auto; } .affiliate-btn{ transition:.2s ease !important; } .affiliate-btn:hover{ transform:translateY(-3px) !important; box-shadow:0 8px 16px rgba(123,47,247,.25) !important; } footer{ background:var(--ink);color:#fff;padding:40px 0 32px;margin-top:60px;text-align:center; } footer a{color:var(--blue);text-decoration:none;font-weight:700} .info-box{background:#f5f5f5;padding:16px;border-radius:10px;margin-bottom:24px;font-size:.9rem;color:var(--ink-soft);text-align:center;line-height:1.6} @media(max-width:760px){ .calc-container{grid-template-columns:1fr;gap:24px} .exchange-button{top:auto;bottom:-60px;transform:translateX(-50%)} } @media(max-width:640px){ .button-grid{grid-template-columns:repeat(3,1fr)} .btn.equals,.btn.clear{grid-column:span 3} }

Double Calculator

Two calculators side-by-side with drag & drop value transfer

💡 Drag results between calculators to transfer values, or use both independently for compound calculations

Calculator 1

Calculator 2

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