:root{--background:#f4f6f8;--panel:#fff;--ink:#17202a;--muted:#667085;--line:#dfe4ea;--accent:#1677ff;--accent-hover:#0d68e0;--success:#168a53;--danger:#c53447}*{box-sizing:border-box}html{background:var(--background);--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}body{background:var(--background);min-height:100vh;color:var(--ink);margin:0;font-family:Inter,Segoe UI,Microsoft YaHei,sans-serif}button,input{font:inherit}button{-webkit-tap-highlight-color:transparent}.site-layout{min-height:100vh}.battery-page{background:#101020;height:100vh;min-height:560px;overflow:hidden}.battery-calculator-frame{background:#101020;border:0;width:100%;height:100%;display:block}.page-shell{min-height:100vh;padding:40px 20px}.tool-shell{width:min(880px,100%);margin:0 auto}.tool-header{justify-content:space-between;align-items:flex-end;gap:24px;margin-bottom:18px;display:flex}.tool-label{color:var(--muted);margin-bottom:5px;font-size:12px;display:block}.tool-header 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