:root{--bg:#f4f6f5;--surface:#fff;--ink:#17221d;--muted:#627169;--line:#dce4df;--accent:#205b42;--accent-hover:#174633;--danger:#a3332c}*{box-sizing:border-box}body{background:var(--bg);color:var(--ink);margin:0;font-family:Noto Sans CJK SC,Source Han Sans SC,Microsoft YaHei,sans-serif;font-size:16px;line-height:1.6}button,input,textarea{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.48}button:focus-visible,summary:focus-visible,input:focus-visible,textarea:focus-visible{outline-offset:3px;outline:3px solid #8fc3aa}.studio-shell{max-width:1500px;min-height:100dvh;margin:0 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