:root{--bg: #fafafa;--surface: #ffffff;--text: #1a1a1a;--text-secondary: #666;--border: #e5e5e5;--primary: #2563eb;--primary-dark: #1d4ed8;--error-bg: #fef2f2;--error: #b91c1c;--success-bg: #f0fdf4;--success: #15803d}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg);color:var(--text);line-height:1.5}button{font-family:inherit}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.error-message{background:var(--error-bg);color:var(--error);padding:10px;border-radius:4px;margin-bottom:15px}.success-message{background:var(--success-bg);color:var(--success);padding:10px;border-radius:4px;margin-bottom:15px}