:root{--bg:#f6f8fb;--card:#fff;--text:#0f172a;--muted:#667085;--accent:#2563eb;--accent-2:#16a34a;--line:#e3e8ef;--danger:#dc2626}*{box-sizing:border-box}#__next,body,html{min-height:100%}body{margin:0;font:16px/1.5 system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,Helvetica,Arial,Apple Color Emoji,Segoe UI Emoji;color:var(--text);background:var(--bg)}.container{max-width:960px;margin:0 auto;padding:clamp(16px,3vw,32px)}header{margin-bottom:16px}h1{font-size:clamp(22px,4vw,32px);margin:0 0 6px;font-weight:700}.subtitle{margin:0;color:var(--muted)}.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px;box-shadow:0 10px 20px rgba(15,23,42,.06)}.method-header{display:flex;align-items:baseline;gap:12px;justify-content:space-between;flex-wrap:wrap}@media (max-width:640px){.method-header{flex-direction:column;align-items:stretch;gap:8px}.method-header 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p{margin:0;color:var(--muted);font-size:14px}.method-icon{width:40px;height:40px;display:grid;place-items:center;border-radius:10px;background:linear-gradient(180deg,rgba(37,99,235,.15),rgba(37,99,235,.08));color:#0f172a;font-weight:900;font-size:22px;box-shadow:inset 0 0 0 1px rgba(37,99,235,.22)}.inputs{display:flex;align-items:flex-end;gap:12px;flex-wrap:wrap}.field{display:flex;flex-direction:column;gap:6px}label{font-size:13px;color:var(--muted)}input[type=number],input[type=text]{background:#fff;border:1px solid var(--line);color:var(--text);border-radius:10px;padding:10px 12px;min-width:200px;outline:none}input[type=number]:focus,input[type=text]:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(37,99,235,.15)}.slash{font-size:22px;color:var(--muted);padding:0 4px 6px}.helper{margin-top:12px}.equation-row{display:flex;gap:8px;align-items:center}.equation-row input{flex:1 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Emoji;font-size:clamp(15px,2.2vw,18px);line-height:1.65}.walkthrough-controls{display:flex;flex-direction:column;gap:10px}.switch-row{gap:10px;color:var(--text)}.stepper,.switch-row{display:flex;align-items:center}.stepper{justify-content:space-between;gap:12px;flex-wrap:wrap}.step-info{color:var(--muted)}.btn-group{display:flex;gap:8px;flex-wrap:wrap}@media (max-width:600px){.walkthrough-controls .btn-group{width:100%}.walkthrough-controls .btn-group .btn{flex:1 1}}.note{color:var(--muted);text-align:center;margin:18px 0 0}.step-text{font-size:clamp(15px,2.2vw,18px);line-height:1.65}.step-text .intro{margin:0 0 10px;color:var(--muted)}.step{background:rgba(37,99,235,.03);border:1px solid var(--line);border-radius:10px;padding:12px}.step+.step{margin-top:10px}.step-title{margin:0 0 6px}.badge{display:inline-block;padding:4px 10px;border-radius:999px;font-size:12px;font-weight:700;color:var(--accent);background:rgba(37,99,235,.12);box-shadow:inset 0 0 0 1px rgba(37,99,235,.28)}.step:last-child .badge{background:var(--accent);color:#fff;box-shadow:none}.step-bullets{margin:6px 0 0 18px}.step-bullets li+li{margin-top:4px}.summary{margin-top:12px;padding-top:10px;border-top:1px dashed var(--line)}.summary p{margin:6px 0}.summary p.answer{font-weight:700;color:var(--accent-2)}.summary p.remainder{color:var(--muted)}.progress{position:relative;height:6px;background:var(--line);border-radius:999px;overflow:hidden}.progress-bar{position:absolute;top:0;left:0;bottom:0;width:0;background:linear-gradient(90deg,var(--accent),#1d4ed8);transition:width .2s ease}canvas{width:100%;height:auto;background:#fff;border:1px solid var(--line);border-radius:8px}@media (max-width:600px){input[type=number],input[type=text]{min-width:140px}.actions{flex-direction:column}.actions .btn{width:100%}.inputs{flex-direction:column;align-items:stretch}.field{width:100%}.field input[type=number],.field input[type=text]{width:100%;min-width:0}.slash{display:none}}@media (min-width:900px){.results{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));align-items:start}}@media (prefers-reduced-motion:reduce){.method-card{transition:none}}
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