:root{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--bg:#090c11;--surface:#0f141c;--panel:#121923;--panel-2:#18212d;--panel-3:#0b1017;--line:#293545;--line-strong:#405066;--text:#f4f6f8;--muted:#9aa7b7;--muted-2:#718095;--accent:#ffb545;--accent-hover:#ffc567;--blue:#5eb0ff;--green:#52dc8c;--red:#ff6478;--purple:#b596ff;--radius:12px;--shadow:0 22px 60px #0000005c}*{box-sizing:border-box}html{min-width:320px}body{min-width:320px;min-height:100vh;color:var(--text);background:radial-gradient(circle at 8% -8%, #ffb5451a, transparent 28rem), radial-gradient(circle at 88% 8%, #5eb0ff0d, transparent 25rem), var(--bg);margin:0;font-family:Inter,Pretendard,Noto Sans KR,system-ui,-apple-system,sans-serif;font-size:14px}button,input,select{font:inherit}button{color:inherit}button,label,summary{-webkit-tap-highlight-color:transparent}button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,.file-label:focus-within{outline-offset:2px;outline:3px solid #5eb0ffb3}button:disabled{cursor:not-allowed;opacity:.42;transform:none!important}.app-header{border-bottom:1px solid var(--line);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:#090c11e6;justify-content:space-between;align-items:center;gap:24px;min-height:96px;padding:18px clamp(18px,2.3vw,36px);display:flex}.brand-block{min-width:220px}.eyebrow{color:var(--accent);letter-spacing:.22em;margin:0 0 2px;font-size:10px;font-weight:800}h1{letter-spacing:-.04em;margin:0;font-size:clamp(23px,2vw,28px)}.subtitle{color:var(--muted);margin:5px 0 0;font-size:12px}.header-actions,.action-group{align-items:center;gap:8px;display:flex}.header-actions{flex-wrap:wrap;justify-content:flex-end}.action-group{border-left:1px solid var(--line);padding-left:12px}.language-actions{border-left:0;padding-left:0}.language-toggle{justify-content:center;gap:7px;min-width:104px}.language-toggle 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input{opacity:0;cursor:pointer;width:100%;height:100%;position:absolute;inset:0}.app-shell{grid-template-columns:250px minmax(560px,1fr) 300px;grid-template-areas:"tools workspace simulation";height:calc(100vh - 96px);min-height:560px;display:grid}.panel{scrollbar-width:thin;scrollbar-color:var(--line-strong) transparent;background:#121923f0;min-width:0;padding:20px 16px;overflow-y:auto}.tool-panel{border-right:1px solid var(--line);grid-area:tools}.simulation-panel{border-left:1px solid var(--line);grid-area:simulation}.section-heading{align-items:center;gap:10px;margin-bottom:15px;display:flex}.section-heading.compact{margin-top:22px}.section-heading h2{margin:0;font-size:14px}.section-heading p{color:var(--muted);margin:3px 0 0;font-size:10px}.step{color:#171007;background:var(--accent);border-radius:7px;flex:0 0 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