:root{--bg:#ffffff;--bg-soft:#fafafa;--text:#111111;--text-dim:#666666;--text-faint:#8a8a8a;--border:#e2e2e2;--border-strong:#c9c9c9;--surface:#fafafa;--surface-hover:#f2f2f2}*{box-sizing:border-box}body,html{margin:0;padding:0;min-height:100%}body{background:var(--bg);font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased;line-height:1.6}a,body{color:var(--text)}a{text-decoration:none}.btn{display:inline-block;font-family:inherit;font-size:1rem;letter-spacing:.01em;padding:.55rem 1.4rem;border-radius:6px;cursor:pointer;background:var(--text);color:var(--bg);border:1px solid var(--text);transition:background .18s ease,color .18s ease,border-color .18s 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