:root{--bg:#f6f7f9;--card:#ffffff;--ink:#1a1f27;--sub:#68717e;--accent:#2563eb;--accent2:#0ea5e9;--ok:#059669;--warn:#d97706;--line:#e5e8ee;--radius:16px}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}body{margin:0;background:var(--bg);color:var(--ink);font-family:Pretendard,Apple SD Gothic Neo,Noto Sans KR,system-ui,sans-serif;font-size:15px;line-height:1.55}.wrap{max-width:520px;margin:0 auto;padding:16px 16px 48px}h1{font-size:20px;margin:8px 0 2px}.sub{color:var(--sub);font-size:13px;margin:0 0 16px}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;margin-bottom:14px}.card h2{font-size:15px;margin:0 0 10px}ol.guide{margin:0;padding-left:20px}ol.guide li{margin-bottom:8px}.btn{display:block;width:100%;border:none;border-radius:12px;padding:14px;font-size:16px;font-weight:700;cursor:pointer;font-family:inherit}.btn-primary{background:var(--accent);color:#fff}.btn-ghost{background:#eef1f6;color:var(--ink);margin-top:8px}.btn-row{display:flex;gap:8px;margin-top:8px}.btn-row .btn{margin-top:0;font-size:14px;padding:12px 8px}.btn-inline{border:none;background:#eef1f6;border-radius:8px;padding:4px 10px;font-family:inherit;cursor:pointer}.rot-row{display:flex;align-items:center;gap:8px;margin:8px 2px 0}.rot-row input[type=range]{flex:1;min-width:0;accent-color:#2563eb}.btn-step{border:none;background:#eef1f6;border-radius:8px;padding:8px 10px;font-family:inherit;font-size:14px;cursor:pointer;min-width:52px}.rot-val{font-variant-numeric:tabular-nums;font-size:13px;color:var(--sub);min-width:34px;text-align:right}.hidden{display:none}canvas.view{width:100%;border-radius:12px;display:block;touch-action:none;background:#111}.hint{font-size:13px;color:var(--sub);margin:10px 2px}.toast{background:#fff7ed;border:1px solid #fed7aa;color:#9a3412;border-radius:10px;padding:10px 12px;font-size:13px;margin:10px 0}.result-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:12px 0}.metric{background:#f2f6ff;border-radius:12px;padding:12px;text-align:center}.metric .v{font-size:24px;font-weight:800;color:var(--accent)}.metric .l{font-size:12px;color:var(--sub)}table.sizes{width:100%;border-collapse:collapse;font-size:14px}table.sizes td,table.sizes th{padding:8px 6px;border-bottom:1px solid var(--line);text-align:center}table.sizes th{color:var(--sub);font-weight:600;font-size:12px}.chips{display:flex;gap:8px;margin-bottom:10px}.chip{flex:1;text-align:center;padding:10px;border-radius:10px;border:1.5px solid var(--line);background:#fff;font-weight:700;cursor:pointer;font-size:14px}.chip.active{border-color:var(--accent);color:var(--accent);background:#eff4ff}.chip.saved:after{content:" ✓";color:var(--ok)}.diagram{display:block;margin:8px auto 4px}.footnote{font-size:12px;color:var(--sub);margin-top:10px}